/* Build expressions with type checking for C++ compiler. Copyright (C) 1987, 88, 89, 92, 93, 94, 1995 Free Software Foundation, Inc. Hacked by Michael Tiemann (tiemann@cygnus.com) This file is part of GNU CC. GNU CC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU CC; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* This file is part of the C++ front end. It contains routines to build C++ expressions given their operands, including computing the types of the result, C and C++ specific error checks, and some optimization. There are also routines to build RETURN_STMT nodes and CASE_STMT nodes, and to process initializations in declarations (since they work like a strange sort of assignment). */ extern void error (); extern void warning (); #include "config.h" #include #include "tree.h" #include "rtl.h" #include "cp-tree.h" #include "flags.h" #include "output.h" int mark_addressable (); static tree convert_for_assignment (); /* static */ tree convert_for_initialization (); extern tree shorten_compare (); extern void binary_op_error (); static tree pointer_int_sum (); static tree pointer_diff (); static tree convert_sequence (); /* static */ tree unary_complex_lvalue (); static tree get_delta_difference PROTO((tree, tree, int)); extern rtx original_result_rtx; extern int warn_synth; /* Return the target type of TYPE, which meas return T for: T*, T&, T[], T (...), and otherwise, just T. */ tree target_type (type) tree type; { if (TREE_CODE (type) == REFERENCE_TYPE) type = TREE_TYPE (type); while (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == ARRAY_TYPE || TREE_CODE (type) == FUNCTION_TYPE || TREE_CODE (type) == METHOD_TYPE || TREE_CODE (type) == OFFSET_TYPE) type = TREE_TYPE (type); return type; } /* Do `exp = require_complete_type (exp);' to make sure exp does not have an incomplete type. (That includes void types.) */ tree require_complete_type (value) tree value; { tree type = TREE_TYPE (value); /* First, detect a valid value with a complete type. */ if (TYPE_SIZE (type) != 0 && type != void_type_node && ! (TYPE_LANG_SPECIFIC (type) && (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type)) && TYPE_SIZE (SIGNATURE_TYPE (type)) == 0)) return value; /* If we see X::Y, we build an OFFSET_TYPE which has not been laid out. Try to avoid an error by interpreting it as this->X::Y, if reasonable. */ if (TREE_CODE (value) == OFFSET_REF && C_C_D != 0 && TREE_OPERAND (value, 0) == C_C_D) { tree base, member = TREE_OPERAND (value, 1); tree basetype = TYPE_OFFSET_BASETYPE (type); my_friendly_assert (TREE_CODE (member) == FIELD_DECL, 305); base = convert_pointer_to (basetype, current_class_decl); value = build (COMPONENT_REF, TREE_TYPE (member), build_indirect_ref (base, NULL_PTR), member); return require_complete_type (value); } incomplete_type_error (value, type); return error_mark_node; } /* Return truthvalue of whether type of EXP is instantiated. */ int type_unknown_p (exp) tree exp; { return (TREE_CODE (exp) == TREE_LIST || TREE_TYPE (exp) == unknown_type_node || (TREE_CODE (TREE_TYPE (exp)) == OFFSET_TYPE && TREE_TYPE (TREE_TYPE (exp)) == unknown_type_node)); } /* Return truthvalue of whether T is function (or pfn) type. */ int fntype_p (t) tree t; { return (TREE_CODE (t) == FUNCTION_TYPE || TREE_CODE (t) == METHOD_TYPE || (TREE_CODE (t) == POINTER_TYPE && (TREE_CODE (TREE_TYPE (t)) == FUNCTION_TYPE || TREE_CODE (TREE_TYPE (t)) == METHOD_TYPE))); } /* Do `exp = require_instantiated_type (type, exp);' to make sure EXP does not have an uninstantiated type. TYPE is type to instantiate with, if uninstantiated. */ tree require_instantiated_type (type, exp, errval) tree type, exp, errval; { if (TREE_TYPE (exp) == NULL_TREE) { error ("argument list may not have an initializer list"); return errval; } if (TREE_TYPE (exp) == unknown_type_node || (TREE_CODE (TREE_TYPE (exp)) == OFFSET_TYPE && TREE_TYPE (TREE_TYPE (exp)) == unknown_type_node)) { exp = instantiate_type (type, exp, 1); if (TREE_TYPE (exp) == error_mark_node) return errval; } return exp; } /* Return a variant of TYPE which has all the type qualifiers of LIKE as well as those of TYPE. */ static tree qualify_type (type, like) tree type, like; { int constflag = TYPE_READONLY (type) || TYPE_READONLY (like); int volflag = TYPE_VOLATILE (type) || TYPE_VOLATILE (like); /* @@ Must do member pointers here. */ return cp_build_type_variant (type, constflag, volflag); } /* Return the common type of two parameter lists. We assume that comptypes has already been done and returned 1; if that isn't so, this may crash. As an optimization, free the space we allocate if the parameter lists are already common. */ tree commonparms (p1, p2) tree p1, p2; { tree oldargs = p1, newargs, n; int i, len; int any_change = 0; char *first_obj = (char *) oballoc (0); len = list_length (p1); newargs = tree_last (p1); if (newargs == void_list_node) i = 1; else { i = 0; newargs = 0; } for (; i < len; i++) newargs = tree_cons (NULL_TREE, NULL_TREE, newargs); n = newargs; for (i = 0; p1; p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n), i++) { if (TREE_PURPOSE (p1) && !TREE_PURPOSE (p2)) { TREE_PURPOSE (n) = TREE_PURPOSE (p1); any_change = 1; } else if (! TREE_PURPOSE (p1)) { if (TREE_PURPOSE (p2)) { TREE_PURPOSE (n) = TREE_PURPOSE (p2); any_change = 1; } } else { if (1 != simple_cst_equal (TREE_PURPOSE (p1), TREE_PURPOSE (p2))) any_change = 1; TREE_PURPOSE (n) = TREE_PURPOSE (p2); } if (TREE_VALUE (p1) != TREE_VALUE (p2)) { any_change = 1; TREE_VALUE (n) = common_type (TREE_VALUE (p1), TREE_VALUE (p2)); } else TREE_VALUE (n) = TREE_VALUE (p1); } if (! any_change) { obfree (first_obj); return oldargs; } return newargs; } /* Return the common type of two types. We assume that comptypes has already been done and returned 1; if that isn't so, this may crash. This is the type for the result of most arithmetic operations if the operands have the given two types. We do not deal with enumeral types here because they have already been converted to integer types. */ tree common_type (t1, t2) tree t1, t2; { register enum tree_code code1; register enum tree_code code2; tree attributes; /* Save time if the two types are the same. */ if (t1 == t2) return t1; /* If one type is nonsense, use the other. */ if (t1 == error_mark_node) return t2; if (t2 == error_mark_node) return t1; /* Merge the attributes */ { register tree a1, a2; a1 = TYPE_ATTRIBUTES (t1); a2 = TYPE_ATTRIBUTES (t2); /* Either one unset? Take the set one. */ if (!(attributes = a1)) attributes = a2; /* One that completely contains the other? Take it. */ else if (a2 && !attribute_list_contained (a1, a2)) if (attribute_list_contained (a2, a1)) attributes = a2; else { /* Pick the longest list, and hang on the other list. */ /* ??? For the moment we punt on the issue of attrs with args. */ if (list_length (a1) < list_length (a2)) attributes = a2, a2 = a1; for (; a2; a2 = TREE_CHAIN (a2)) if (lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)), attributes) == NULL_TREE) { a1 = copy_node (a2); TREE_CHAIN (a1) = attributes; attributes = a1; } } } /* Treat an enum type as the unsigned integer type of the same width. */ if (TREE_CODE (t1) == ENUMERAL_TYPE) t1 = type_for_size (TYPE_PRECISION (t1), 1); if (TREE_CODE (t2) == ENUMERAL_TYPE) t2 = type_for_size (TYPE_PRECISION (t2), 1); code1 = TREE_CODE (t1); code2 = TREE_CODE (t2); switch (code1) { case INTEGER_TYPE: case REAL_TYPE: /* If only one is real, use it as the result. */ if (code1 == REAL_TYPE && code2 != REAL_TYPE) return build_type_attribute_variant (t1, attributes); if (code2 == REAL_TYPE && code1 != REAL_TYPE) return build_type_attribute_variant (t2, attributes); /* Both real or both integers; use the one with greater precision. */ if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2)) return build_type_attribute_variant (t1, attributes); else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1)) return build_type_attribute_variant (t2, attributes); /* Same precision. Prefer longs to ints even when same size. */ if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node) return build_type_attribute_variant (long_unsigned_type_node, attributes); if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node || TYPE_MAIN_VARIANT (t2) == long_integer_type_node) { /* But preserve unsignedness from the other type, since long cannot hold all the values of an unsigned int. */ if (TREE_UNSIGNED (t1) || TREE_UNSIGNED (t2)) t1 = long_unsigned_type_node; else t1 = long_integer_type_node; return build_type_attribute_variant (t1, attributes); } if (TYPE_MAIN_VARIANT (t1) == long_double_type_node || TYPE_MAIN_VARIANT (t2) == long_double_type_node) return build_type_attribute_variant (long_double_type_node, attributes); /* Otherwise prefer the unsigned one. */ if (TREE_UNSIGNED (t1)) return build_type_attribute_variant (t1, attributes); else return build_type_attribute_variant (t2, attributes); case POINTER_TYPE: case REFERENCE_TYPE: /* For two pointers, do this recursively on the target type, and combine the qualifiers of the two types' targets. */ /* This code was turned off; I don't know why. But ANSI C++ specifies doing this with the qualifiers. So I turned it on again. */ { tree tt1 = TYPE_MAIN_VARIANT (TREE_TYPE (t1)); tree tt2 = TYPE_MAIN_VARIANT (TREE_TYPE (t2)); int constp = TYPE_READONLY (TREE_TYPE (t1)) || TYPE_READONLY (TREE_TYPE (t2)); int volatilep = TYPE_VOLATILE (TREE_TYPE (t1)) || TYPE_VOLATILE (TREE_TYPE (t2)); tree target; if (tt1 == tt2) target = tt1; else if (tt1 == void_type_node || tt2 == void_type_node) target = void_type_node; else target = common_type (tt1, tt2); target = cp_build_type_variant (target, constp, volatilep); if (code1 == POINTER_TYPE) t1 = build_pointer_type (target); else t1 = build_reference_type (target); t1 = build_type_attribute_variant (t1, attributes); if (TREE_CODE (target) == METHOD_TYPE) t1 = build_ptrmemfunc_type (t1); return t1; } #if 0 case POINTER_TYPE: t1 = build_pointer_type (common_type (TREE_TYPE (t1), TREE_TYPE (t2))); return build_type_attribute_variant (t1, attributes); case REFERENCE_TYPE: t1 = build_reference_type (common_type (TREE_TYPE (t1), TREE_TYPE (t2))); return build_type_attribute_variant (t1, attributes); #endif case ARRAY_TYPE: { tree elt = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); /* Save space: see if the result is identical to one of the args. */ if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1)) return build_type_attribute_variant (t1, attributes); if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2)) return build_type_attribute_variant (t2, attributes); /* Merge the element types, and have a size if either arg has one. */ t1 = build_cplus_array_type (elt, TYPE_DOMAIN (TYPE_DOMAIN (t1) ? t1 : t2)); return build_type_attribute_variant (t1, attributes); } case FUNCTION_TYPE: /* Function types: prefer the one that specified arg types. If both do, merge the arg types. Also merge the return types. */ { tree valtype = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); tree p1 = TYPE_ARG_TYPES (t1); tree p2 = TYPE_ARG_TYPES (t2); tree rval, raises; /* Save space: see if the result is identical to one of the args. */ if (valtype == TREE_TYPE (t1) && ! p2) return build_type_attribute_variant (t1, attributes); if (valtype == TREE_TYPE (t2) && ! p1) return build_type_attribute_variant (t2, attributes); /* Simple way if one arg fails to specify argument types. */ if (p1 == NULL_TREE || TREE_VALUE (p1) == void_type_node) { rval = build_function_type (valtype, p2); if ((raises = TYPE_RAISES_EXCEPTIONS (t2))) rval = build_exception_variant (rval, raises); return build_type_attribute_variant (rval, attributes); } raises = TYPE_RAISES_EXCEPTIONS (t1); if (p2 == NULL_TREE || TREE_VALUE (p2) == void_type_node) { rval = build_function_type (valtype, p1); if (raises) rval = build_exception_variant (rval, raises); return build_type_attribute_variant (rval, attributes); } rval = build_function_type (valtype, commonparms (p1, p2)); rval = build_exception_variant (rval, raises); return build_type_attribute_variant (rval, attributes); } case RECORD_TYPE: case UNION_TYPE: my_friendly_assert (TYPE_MAIN_VARIANT (t1) == t1 && TYPE_MAIN_VARIANT (t2) == t2, 306); if (DERIVED_FROM_P (t1, t2) && binfo_or_else (t1, t2)) return build_type_attribute_variant (t1, attributes); else if (binfo_or_else (t2, t1)) return build_type_attribute_variant (t2, attributes); else compiler_error ("common_type called with uncommon aggregate types"); case METHOD_TYPE: if (TREE_CODE (TREE_TYPE (t1)) == TREE_CODE (TREE_TYPE (t2))) { /* Get this value the long way, since TYPE_METHOD_BASETYPE is just the main variant of this. */ tree basetype; tree raises, t3; tree b1 = TYPE_OFFSET_BASETYPE (t1); tree b2 = TYPE_OFFSET_BASETYPE (t2); if (DERIVED_FROM_P (b1, b2) && binfo_or_else (b1, b2)) basetype = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (t2))); else { if (binfo_or_else (b2, b1) == NULL_TREE) compiler_error ("common_type called with uncommon method types"); basetype = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (t1))); } raises = TYPE_RAISES_EXCEPTIONS (t1); /* If this was a member function type, get back to the original type of type member function (i.e., without the class instance variable up front. */ t1 = build_function_type (TREE_TYPE (t1), TREE_CHAIN (TYPE_ARG_TYPES (t1))); t2 = build_function_type (TREE_TYPE (t2), TREE_CHAIN (TYPE_ARG_TYPES (t2))); t3 = common_type (t1, t2); t3 = build_cplus_method_type (basetype, TREE_TYPE (t3), TYPE_ARG_TYPES (t3)); t1 = build_exception_variant (t3, raises); } else compiler_error ("common_type called with uncommon method types"); return build_type_attribute_variant (t1, attributes); case OFFSET_TYPE: if (TREE_TYPE (t1) == TREE_TYPE (t2)) { tree b1 = TYPE_OFFSET_BASETYPE (t1); tree b2 = TYPE_OFFSET_BASETYPE (t2); if (DERIVED_FROM_P (b1, b2) && binfo_or_else (b1, b2)) return build_type_attribute_variant (t2, attributes); else if (binfo_or_else (b2, b1)) return build_type_attribute_variant (t1, attributes); } compiler_error ("common_type called with uncommon member types"); default: return build_type_attribute_variant (t1, attributes); } } /* Return 1 if TYPE1 and TYPE2 raise the same exceptions. */ int compexcepttypes (t1, t2, strict) tree t1, t2; int strict; { return TYPE_RAISES_EXCEPTIONS (t1) == TYPE_RAISES_EXCEPTIONS (t2); } static int comp_array_types (cmp, t1, t2, strict) register int (*cmp)(); tree t1, t2; int strict; { tree d1 = TYPE_DOMAIN (t1); tree d2 = TYPE_DOMAIN (t2); /* Target types must match incl. qualifiers. */ if (!(TREE_TYPE (t1) == TREE_TYPE (t2) || (*cmp) (TREE_TYPE (t1), TREE_TYPE (t2), strict))) return 0; /* Sizes must match unless one is missing or variable. */ if (d1 == 0 || d2 == 0 || d1 == d2 || TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST || TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST) return 1; return ((TREE_INT_CST_LOW (TYPE_MIN_VALUE (d1)) == TREE_INT_CST_LOW (TYPE_MIN_VALUE (d2))) && (TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d1)) == TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d2))) && (TREE_INT_CST_LOW (TYPE_MAX_VALUE (d1)) == TREE_INT_CST_LOW (TYPE_MAX_VALUE (d2))) && (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d1)) == TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d2)))); } /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment or various other operations. This is what ANSI C++ speaks of as "being the same". For C++: argument STRICT says we should be strict about this comparison: 2 : strict, except that if one type is a reference and the other is not, compare the target type of the reference to the type that's not a reference (ARM, p308). This is used for checking for invalid overloading. 1 : strict (compared according to ANSI C) This is used for checking whether two function decls match. 0 : <= (compared according to C++) -1: <= or >= (relaxed) Otherwise, pointers involving base classes and derived classes can be mixed as valid: i.e. a pointer to a base class may be assigned to a pointer to one of its derived classes, as per C++. A pointer to a derived class may be passed as a parameter to a function expecting a pointer to a base classes. These allowances do not commute. In this case, TYPE1 is assumed to be the base class, and TYPE2 is assumed to be the derived class. */ int comptypes (type1, type2, strict) tree type1, type2; int strict; { register tree t1 = type1; register tree t2 = type2; int attrval, val; /* Suppress errors caused by previously reported errors */ if (t1 == t2) return 1; /* This should never happen. */ my_friendly_assert (t1 != error_mark_node, 307); if (t2 == error_mark_node) return 0; if (strict < 0) { /* Treat an enum type as the unsigned integer type of the same width. */ if (TREE_CODE (t1) == ENUMERAL_TYPE) t1 = type_for_size (TYPE_PRECISION (t1), 1); if (TREE_CODE (t2) == ENUMERAL_TYPE) t2 = type_for_size (TYPE_PRECISION (t2), 1); if (t1 == t2) return 1; } /* Different classes of types can't be compatible. */ if (TREE_CODE (t1) != TREE_CODE (t2)) { if (strict == 2 && ((TREE_CODE (t1) == REFERENCE_TYPE) ^ (TREE_CODE (t2) == REFERENCE_TYPE))) { if (TREE_CODE (t1) == REFERENCE_TYPE) return comptypes (TREE_TYPE (t1), t2, 1); return comptypes (t1, TREE_TYPE (t2), 1); } return 0; } if (strict > 1) strict = 1; /* Qualifiers must match. */ if (TYPE_READONLY (t1) != TYPE_READONLY (t2)) return 0; if (TYPE_VOLATILE (t1) != TYPE_VOLATILE (t2)) return 0; /* Allow for two different type nodes which have essentially the same definition. Note that we already checked for equality of the type type qualifiers (just above). */ if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) return 1; #ifdef COMP_TYPE_ATTRIBUTES if (! (attrval = COMP_TYPE_ATTRIBUTES (t1, t2))) return 0; #else /* 1 if no need for warning yet, 2 if warning cause has been seen. */ attrval = 1; #endif /* 1 if no need for warning yet, 2 if warning cause has been seen. */ val = 0; switch (TREE_CODE (t1)) { case RECORD_TYPE: case UNION_TYPE: if (strict <= 0) goto look_hard; return 0; case OFFSET_TYPE: val = (comptypes (build_pointer_type (TYPE_OFFSET_BASETYPE (t1)), build_pointer_type (TYPE_OFFSET_BASETYPE (t2)), strict) && comptypes (TREE_TYPE (t1), TREE_TYPE (t2), strict)); break; case METHOD_TYPE: if (! compexcepttypes (t1, t2, strict)) return 0; /* This case is anti-symmetrical! One can pass a base member (or member function) to something expecting a derived member (or member function), but not vice-versa! */ val = (comptypes (TREE_TYPE (t1), TREE_TYPE (t2), strict) && compparms (TYPE_ARG_TYPES (t1), TYPE_ARG_TYPES (t2), strict)); break; case POINTER_TYPE: case REFERENCE_TYPE: t1 = TREE_TYPE (t1); t2 = TREE_TYPE (t2); if (t1 == t2) { val = 1; break; } if (strict <= 0) { if (TREE_CODE (t1) == RECORD_TYPE && TREE_CODE (t2) == RECORD_TYPE) { int rval; look_hard: rval = t1 == t2 || UNIQUELY_DERIVED_FROM_P (t1, t2); if (rval) { val = 1; break; } if (strict < 0) { val = UNIQUELY_DERIVED_FROM_P (t2, t1); break; } } return 0; } else val = comptypes (t1, t2, strict); break; case FUNCTION_TYPE: if (! compexcepttypes (t1, t2, strict)) return 0; val = ((TREE_TYPE (t1) == TREE_TYPE (t2) || comptypes (TREE_TYPE (t1), TREE_TYPE (t2), strict)) && compparms (TYPE_ARG_TYPES (t1), TYPE_ARG_TYPES (t2), strict)); break; case ARRAY_TYPE: /* Target types must match incl. qualifiers. */ val = comp_array_types (comptypes, t1, t2, strict); break; case TEMPLATE_TYPE_PARM: return TEMPLATE_TYPE_IDX (t1) == TEMPLATE_TYPE_IDX (t2); case UNINSTANTIATED_P_TYPE: if (UPT_TEMPLATE (t1) != UPT_TEMPLATE (t2)) return 0; { int i = TREE_VEC_LENGTH (UPT_PARMS (t1)); tree *p1 = &TREE_VEC_ELT (UPT_PARMS (t1), 0); tree *p2 = &TREE_VEC_ELT (UPT_PARMS (t2), 0); while (i--) { if (TREE_CODE_CLASS (TREE_CODE (p1[i])) == 't') { if (! comptypes (p1[i], p2[i], 1)) return 0; } else { if (simple_cst_equal (p1[i], p2[i]) <= 0) return 0; } } } return 1; } return attrval == 2 && val == 1 ? 2 : val; } /* Return 1 if TTL and TTR are pointers to types that are equivalent, ignoring their qualifiers. NPTRS is the number of pointers we can strip off and keep cool. This is used to permit (for aggr A, aggr B) A, B* to convert to A*, but to not permit B** to convert to A**. */ int comp_target_types (ttl, ttr, nptrs) tree ttl, ttr; int nptrs; { ttl = TYPE_MAIN_VARIANT (ttl); ttr = TYPE_MAIN_VARIANT (ttr); if (ttl == ttr) return 1; if (TREE_CODE (ttr) != TREE_CODE (ttl)) return 0; if (TREE_CODE (ttr) == POINTER_TYPE) { ttl = TREE_TYPE (ttl); ttr = TREE_TYPE (ttr); if (nptrs > 0) { if (TREE_CODE (ttl) == VOID_TYPE && TREE_CODE (ttr) != FUNCTION_TYPE && TREE_CODE (ttr) != METHOD_TYPE && TREE_CODE (ttr) != OFFSET_TYPE) return 1; else if (TREE_CODE (ttr) == VOID_TYPE && TREE_CODE (ttl) != FUNCTION_TYPE && TREE_CODE (ttl) != METHOD_TYPE && TREE_CODE (ttl) != OFFSET_TYPE) return -1; else if (TREE_CODE (ttl) == POINTER_TYPE || TREE_CODE (ttl) == ARRAY_TYPE) { if (comp_ptr_ttypes (ttl, ttr)) return 1; else if (comp_ptr_ttypes (ttr, ttl)) return -1; return 0; } } /* Const and volatile mean something different for function types, so the usual checks are not appropriate. */ if (TREE_CODE (ttl) == FUNCTION_TYPE || TREE_CODE (ttl) == METHOD_TYPE) return comp_target_types (ttl, ttr, nptrs - 1); /* Make sure that the cv-quals change only in the same direction as the target type. */ { int t; int c = TYPE_READONLY (ttl) - TYPE_READONLY (ttr); int v = TYPE_VOLATILE (ttl) - TYPE_VOLATILE (ttr); if ((c > 0 && v < 0) || (c < 0 && v > 0)) return 0; if (TYPE_MAIN_VARIANT (ttl) == TYPE_MAIN_VARIANT (ttr)) return (c + v < 0) ? -1 : 1; t = comp_target_types (ttl, ttr, nptrs - 1); if ((t == 1 && c + v >= 0) || (t == -1 && c + v <= 0)) return t; return 0; } } if (TREE_CODE (ttr) == REFERENCE_TYPE) return comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs); if (TREE_CODE (ttr) == ARRAY_TYPE) return comp_array_types (comp_target_types, ttl, ttr, 0); else if (TREE_CODE (ttr) == FUNCTION_TYPE || TREE_CODE (ttr) == METHOD_TYPE) if (comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs)) switch (comp_target_parms (TYPE_ARG_TYPES (ttl), TYPE_ARG_TYPES (ttr), 1)) { case 0: return 0; case 1: return 1; case 2: return -1; default: my_friendly_abort (112); } else return 0; /* for C++ */ else if (TREE_CODE (ttr) == OFFSET_TYPE) { /* Contravariance: we can assign a pointer to base member to a pointer to derived member. Note difference from simple pointer case, where we can pass a pointer to derived to a pointer to base. */ if (comptypes (TYPE_OFFSET_BASETYPE (ttr), TYPE_OFFSET_BASETYPE (ttl), 0)) return comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs); else if (comptypes (TYPE_OFFSET_BASETYPE (ttl), TYPE_OFFSET_BASETYPE (ttr), 0) && comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs)) return -1; } else if (IS_AGGR_TYPE (ttl)) { if (nptrs < 0) return 0; if (comptypes (build_pointer_type (ttl), build_pointer_type (ttr), 0)) return 1; if (comptypes (build_pointer_type (ttr), build_pointer_type (ttl), 0)) return -1; return 0; } return 0; } /* If two types share a common base type, return that basetype. If there is not a unique most-derived base type, this function returns ERROR_MARK_NODE. */ tree common_base_type (tt1, tt2) tree tt1, tt2; { tree best = NULL_TREE, tmp; int i; /* If one is a baseclass of another, that's good enough. */ if (UNIQUELY_DERIVED_FROM_P (tt1, tt2)) return tt1; if (UNIQUELY_DERIVED_FROM_P (tt2, tt1)) return tt2; #if 0 /* If they share a virtual baseclass, that's good enough. */ for (tmp = CLASSTYPE_VBASECLASSES (tt1); tmp; tmp = TREE_CHAIN (tmp)) { if (binfo_member (BINFO_TYPE (tmp), CLASSTYPE_VBASECLASSES (tt2))) return BINFO_TYPE (tmp); } #endif /* Otherwise, try to find a unique baseclass of TT1 that is shared by TT2, and follow that down. */ for (i = CLASSTYPE_N_BASECLASSES (tt1)-1; i >= 0; i--) { tree basetype = TYPE_BINFO_BASETYPE (tt1, i); tree trial = common_base_type (basetype, tt2); if (trial) { if (trial == error_mark_node) return trial; if (best == NULL_TREE) best = trial; else if (best != trial) return error_mark_node; } } /* Same for TT2. */ for (i = CLASSTYPE_N_BASECLASSES (tt2)-1; i >= 0; i--) { tree basetype = TYPE_BINFO_BASETYPE (tt2, i); tree trial = common_base_type (tt1, basetype); if (trial) { if (trial == error_mark_node) return trial; if (best == NULL_TREE) best = trial; else if (best != trial) return error_mark_node; } } return best; } /* Subroutines of `comptypes'. */ /* Return 1 if two parameter type lists PARMS1 and PARMS2 are equivalent in the sense that functions with those parameter types can have equivalent types. If either list is empty, we win. Otherwise, the two lists must be equivalent, element by element. C++: See comment above about TYPE1, TYPE2, STRICT. If STRICT == 3, it means checking is strict, but do not compare default parameter values. */ int compparms (parms1, parms2, strict) tree parms1, parms2; int strict; { register tree t1 = parms1, t2 = parms2; /* An unspecified parmlist matches any specified parmlist whose argument types don't need default promotions. */ if (strict <= 0 && t1 == 0) return self_promoting_args_p (t2); if (strict < 0 && t2 == 0) return self_promoting_args_p (t1); while (1) { if (t1 == 0 && t2 == 0) return 1; /* If one parmlist is shorter than the other, they fail to match, unless STRICT is <= 0. */ if (t1 == 0 || t2 == 0) { if (strict > 0) return 0; if (strict < 0) return 1; if (strict == 0) return t1 && TREE_PURPOSE (t1); } if (! comptypes (TREE_VALUE (t2), TREE_VALUE (t1), strict)) { if (strict > 0) return 0; if (strict == 0) return t2 == void_list_node && TREE_PURPOSE (t1); return TREE_PURPOSE (t1) || TREE_PURPOSE (t2); } #if 0 /* Default parms are not part of the type of a function. */ if (strict != 3 && TREE_PURPOSE (t1) && TREE_PURPOSE (t2)) { int cmp = simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2)); if (cmp < 0) my_friendly_abort (113); if (cmp == 0) return 0; } #endif t1 = TREE_CHAIN (t1); t2 = TREE_CHAIN (t2); } } /* This really wants return whether or not parameter type lists would make their owning functions assignment compatible or not. */ int comp_target_parms (parms1, parms2, strict) tree parms1, parms2; int strict; { register tree t1 = parms1, t2 = parms2; int warn_contravariance = 0; /* An unspecified parmlist matches any specified parmlist whose argument types don't need default promotions. @@@ see 13.3.3 for a counterexample... */ if (t1 == 0 && t2 != 0) { cp_pedwarn ("ANSI C++ prohibits conversion from `(%#T)' to `(...)'", parms2); return self_promoting_args_p (t2); } if (t2 == 0) return self_promoting_args_p (t1); for (; t1 || t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2)) { tree p1, p2; /* If one parmlist is shorter than the other, they fail to match, unless STRICT is <= 0. */ if (t1 == 0 || t2 == 0) { if (strict > 0) return 0; if (strict < 0) return 1 + warn_contravariance; return ((t1 && TREE_PURPOSE (t1)) + warn_contravariance); } p1 = TREE_VALUE (t1); p2 = TREE_VALUE (t2); if (p1 == p2) continue; if ((TREE_CODE (p1) == POINTER_TYPE && TREE_CODE (p2) == POINTER_TYPE) || (TREE_CODE (p1) == REFERENCE_TYPE && TREE_CODE (p2) == REFERENCE_TYPE)) { if (strict <= 0 && (TYPE_MAIN_VARIANT (TREE_TYPE (p1)) == TYPE_MAIN_VARIANT (TREE_TYPE (p2)))) continue; /* The following is wrong for contravariance, but many programs depend on it. */ if (TREE_TYPE (p1) == void_type_node) continue; if (TREE_TYPE (p2) == void_type_node) { warn_contravariance = 1; continue; } if (IS_AGGR_TYPE (TREE_TYPE (p1))) { if (comptypes (p2, p1, 0) == 0) { if (comptypes (p1, p2, 0) != 0) warn_contravariance = 1; else return 0; } continue; } } /* Note backwards order due to contravariance. */ if (comp_target_types (p2, p1, 1) == 0) { if (comp_target_types (p1, p2, 1)) { warn_contravariance = 1; continue; } if (strict != 0) return 0; #if 0 /* What good do these cases do? */ if (strict == 0) return p2 == void_type_node && TREE_PURPOSE (t1); return TREE_PURPOSE (t1) || TREE_PURPOSE (t2); #endif } /* Target types are compatible--just make sure that if we use parameter lists, that they are ok as well. */ if (TREE_CODE (p1) == FUNCTION_TYPE || TREE_CODE (p1) == METHOD_TYPE) switch (comp_target_parms (TYPE_ARG_TYPES (p1), TYPE_ARG_TYPES (p2), strict)) { case 0: return 0; case 1: break; case 2: warn_contravariance = 1; } if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2)) { int cmp = simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2)); if (cmp < 0) my_friendly_abort (114); if (cmp == 0) return 0; } } return 1 + warn_contravariance; } /* Return 1 if PARMS specifies a fixed number of parameters and none of their types is affected by default promotions. */ int self_promoting_args_p (parms) tree parms; { register tree t; for (t = parms; t; t = TREE_CHAIN (t)) { register tree type = TREE_VALUE (t); if (TREE_CHAIN (t) == 0 && type != void_type_node) return 0; if (TYPE_MAIN_VARIANT (type) == float_type_node) return 0; if (type == 0) return 0; if (C_PROMOTING_INTEGER_TYPE_P (type)) return 0; } return 1; } /* Return an unsigned type the same as TYPE in other respects. C++: must make these work for type variants as well. */ tree unsigned_type (type) tree type; { tree type1 = TYPE_MAIN_VARIANT (type); if (type1 == signed_char_type_node || type1 == char_type_node) return unsigned_char_type_node; if (type1 == integer_type_node) return unsigned_type_node; if (type1 == short_integer_type_node) return short_unsigned_type_node; if (type1 == long_integer_type_node) return long_unsigned_type_node; if (type1 == long_long_integer_type_node) return long_long_unsigned_type_node; return type; } /* Return a signed type the same as TYPE in other respects. */ tree signed_type (type) tree type; { tree type1 = TYPE_MAIN_VARIANT (type); if (type1 == unsigned_char_type_node || type1 == char_type_node) return signed_char_type_node; if (type1 == unsigned_type_node) return integer_type_node; if (type1 == short_unsigned_type_node) return short_integer_type_node; if (type1 == long_unsigned_type_node) return long_integer_type_node; if (type1 == long_long_unsigned_type_node) return long_long_integer_type_node; return type; } /* Return a type the same as TYPE except unsigned or signed according to UNSIGNEDP. */ tree signed_or_unsigned_type (unsignedp, type) int unsignedp; tree type; { if (! INTEGRAL_TYPE_P (type)) return type; if (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node)) return unsignedp ? unsigned_char_type_node : signed_char_type_node; if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)) return unsignedp ? unsigned_type_node : integer_type_node; if (TYPE_PRECISION (type) == TYPE_PRECISION (short_integer_type_node)) return unsignedp ? short_unsigned_type_node : short_integer_type_node; if (TYPE_PRECISION (type) == TYPE_PRECISION (long_integer_type_node)) return unsignedp ? long_unsigned_type_node : long_integer_type_node; if (TYPE_PRECISION (type) == TYPE_PRECISION (long_long_integer_type_node)) return (unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node); return type; } tree c_sizeof (type) tree type; { enum tree_code code = TREE_CODE (type); tree t; if (code == FUNCTION_TYPE) { if (pedantic || warn_pointer_arith) pedwarn ("ANSI C++ forbids taking the sizeof a function type"); return size_int (1); } if (code == METHOD_TYPE) { if (pedantic || warn_pointer_arith) pedwarn ("ANSI C++ forbids taking the sizeof a method type"); return size_int (1); } if (code == VOID_TYPE) { if (pedantic || warn_pointer_arith) pedwarn ("ANSI C++ forbids taking the sizeof a void type"); return size_int (1); } if (code == ERROR_MARK) return size_int (1); /* ARM $5.3.2: ``When applied to a reference, the result is the size of the referenced object.'' */ if (code == REFERENCE_TYPE) type = TREE_TYPE (type); /* We couldn't find anything in the ARM or the draft standard that says, one way or the other, if doing sizeof on something that doesn't have an object associated with it is correct or incorrect. For example, if you declare `struct S { char str[16]; };', and in your program do a `sizeof (S::str)', should we flag that as an error or should we give the size of it? Since it seems like a reasonable thing to do, we'll go with giving the value. */ if (code == OFFSET_TYPE) type = TREE_TYPE (type); /* @@ This also produces an error for a signature ref. In that case we should be able to do better. */ if (IS_SIGNATURE (type)) { error ("`sizeof' applied to a signature type"); return size_int (0); } if (TYPE_SIZE (type) == 0) { error ("`sizeof' applied to an incomplete type"); return size_int (0); } /* Convert in case a char is more than one unit. */ t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), size_int (TYPE_PRECISION (char_type_node))); /* size_binop does not put the constant in range, so do it now. */ if (TREE_CODE (t) == INTEGER_CST && force_fit_type (t, 0)) TREE_CONSTANT_OVERFLOW (t) = TREE_OVERFLOW (t) = 1; return t; } tree c_sizeof_nowarn (type) tree type; { enum tree_code code = TREE_CODE (type); tree t; if (code == FUNCTION_TYPE || code == METHOD_TYPE || code == VOID_TYPE || code == ERROR_MARK) return size_int (1); if (code == REFERENCE_TYPE) type = TREE_TYPE (type); if (TYPE_SIZE (type) == 0) { #if 0 /* ??? Tiemann, why have any diagnostic here? There is none in the corresponding function for C. */ warning ("sizeof applied to an incomplete type"); #endif return size_int (0); } /* Convert in case a char is more than one unit. */ t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), size_int (TYPE_PRECISION (char_type_node))); force_fit_type (t, 0); return t; } /* Implement the __alignof keyword: Return the minimum required alignment of TYPE, measured in bytes. */ tree c_alignof (type) tree type; { enum tree_code code = TREE_CODE (type); tree t; if (code == FUNCTION_TYPE || code == METHOD_TYPE) return size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT); if (code == VOID_TYPE || code == ERROR_MARK) return size_int (1); /* C++: this is really correct! */ if (code == REFERENCE_TYPE) type = TREE_TYPE (type); /* @@ This also produces an error for a signature ref. In that case we should be able to do better. */ if (IS_SIGNATURE (type)) { error ("`__alignof' applied to a signature type"); return size_int (1); } t = size_int (TYPE_ALIGN (type) / BITS_PER_UNIT); force_fit_type (t, 0); return t; } /* Perform default promotions for C data used in expressions. Arrays and functions are converted to pointers; enumeral types or short or char, to int. In addition, manifest constants symbols are replaced by their values. C++: this will automatically bash references to their target type. */ tree decay_conversion (exp) tree exp; { register tree type = TREE_TYPE (exp); register enum tree_code code = TREE_CODE (type); if (code == OFFSET_TYPE /* || TREE_CODE (exp) == OFFSET_REF */ ) { if (TREE_CODE (exp) == OFFSET_REF) return decay_conversion (resolve_offset_ref (exp)); type = TREE_TYPE (type); code = TREE_CODE (type); } if (code == REFERENCE_TYPE) { exp = convert_from_reference (exp); type = TREE_TYPE (exp); code = TREE_CODE (type); } /* Constants can be used directly unless they're not loadable. */ if (TREE_CODE (exp) == CONST_DECL) exp = DECL_INITIAL (exp); /* Replace a nonvolatile const static variable with its value. */ else if (TREE_READONLY_DECL_P (exp)) { exp = decl_constant_value (exp); type = TREE_TYPE (exp); } /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. Leave such NOP_EXPRs, since RHS is being used in non-lvalue context. */ if (code == VOID_TYPE) { error ("void value not ignored as it ought to be"); return error_mark_node; } if (code == FUNCTION_TYPE) { return build_unary_op (ADDR_EXPR, exp, 0); } if (code == METHOD_TYPE) { if (TREE_CODE (exp) == OFFSET_REF) { my_friendly_assert (TREE_CODE (TREE_OPERAND (exp, 1)) == FUNCTION_DECL, 308); return build_unary_op (ADDR_EXPR, TREE_OPERAND (exp, 1), 0); } return build_unary_op (ADDR_EXPR, exp, 0); } if (code == ARRAY_TYPE) { register tree adr; tree restype; tree ptrtype; int constp, volatilep; if (TREE_CODE (exp) == INDIRECT_REF) { /* Stripping away the INDIRECT_REF is not the right thing to do for references... */ tree inner = TREE_OPERAND (exp, 0); if (TREE_CODE (TREE_TYPE (inner)) == REFERENCE_TYPE) { inner = build1 (CONVERT_EXPR, build_pointer_type (TREE_TYPE (TREE_TYPE (inner))), inner); TREE_REFERENCE_EXPR (inner) = 1; } return convert (build_pointer_type (TREE_TYPE (type)), inner); } if (TREE_CODE (exp) == COMPOUND_EXPR) { tree op1 = decay_conversion (TREE_OPERAND (exp, 1)); return build (COMPOUND_EXPR, TREE_TYPE (op1), TREE_OPERAND (exp, 0), op1); } if (!lvalue_p (exp) && ! (TREE_CODE (exp) == CONSTRUCTOR && TREE_STATIC (exp))) { error ("invalid use of non-lvalue array"); return error_mark_node; } constp = volatilep = 0; if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'r' || TREE_CODE_CLASS (TREE_CODE (exp)) == 'd') { constp = TREE_READONLY (exp); volatilep = TREE_THIS_VOLATILE (exp); } restype = TREE_TYPE (type); if (TYPE_READONLY (type) || TYPE_VOLATILE (type) || constp || volatilep) restype = cp_build_type_variant (restype, TYPE_READONLY (type) || constp, TYPE_VOLATILE (type) || volatilep); ptrtype = build_pointer_type (restype); if (TREE_CODE (exp) == VAR_DECL) { /* ??? This is not really quite correct in that the type of the operand of ADDR_EXPR is not the target type of the type of the ADDR_EXPR itself. Question is, can this lossage be avoided? */ adr = build1 (ADDR_EXPR, ptrtype, exp); if (mark_addressable (exp) == 0) return error_mark_node; TREE_CONSTANT (adr) = staticp (exp); TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */ return adr; } /* This way is better for a COMPONENT_REF since it can simplify the offset for a component. */ adr = build_unary_op (ADDR_EXPR, exp, 1); return convert (ptrtype, adr); } return exp; } tree default_conversion (exp) tree exp; { tree type; enum tree_code code; exp = decay_conversion (exp); type = TREE_TYPE (exp); code = TREE_CODE (type); if (INTEGRAL_CODE_P (code)) { tree t = type_promotes_to (type); if (t != type) return convert (t, exp); } if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node) return convert (double_type_node, exp); return exp; } tree build_object_ref (datum, basetype, field) tree datum, basetype, field; { tree dtype; if (datum == error_mark_node) return error_mark_node; dtype = TREE_TYPE (datum); if (TREE_CODE (dtype) == REFERENCE_TYPE) dtype = TREE_TYPE (dtype); if (! IS_AGGR_TYPE_CODE (TREE_CODE (dtype))) { cp_error ("request for member `%T::%D' in expression of non-aggregate type `%T'", basetype, field, dtype); return error_mark_node; } else if (IS_SIGNATURE (IDENTIFIER_TYPE_VALUE (basetype))) { warning ("signature name in scope resolution ignored"); return build_component_ref (datum, field, NULL_TREE, 1); } else if (is_aggr_typedef (basetype, 1)) { tree real_basetype = IDENTIFIER_TYPE_VALUE (basetype); tree binfo = binfo_or_else (real_basetype, TREE_TYPE (datum)); if (binfo) return build_component_ref (build_scoped_ref (datum, basetype), field, binfo, 1); } return error_mark_node; } /* Like `build_component_ref, but uses an already found field. Must compute access for C_C_D. Otherwise, ok. */ tree build_component_ref_1 (datum, field, protect) tree datum, field; int protect; { register tree basetype = TREE_TYPE (datum); register enum tree_code code = TREE_CODE (basetype); register tree ref; if (code == REFERENCE_TYPE) { datum = convert_from_reference (datum); basetype = TREE_TYPE (datum); code = TREE_CODE (basetype); } if (! IS_AGGR_TYPE_CODE (code)) { if (code != ERROR_MARK) cp_error ("request for member `%D' in `%E', which is of non-aggregate type `%T'", field, datum, basetype); return error_mark_node; } if (TYPE_SIZE (basetype) == 0) { incomplete_type_error (0, basetype); return error_mark_node; } /* Look up component name in the structure type definition. */ if (field == error_mark_node) my_friendly_abort (115); if (TREE_STATIC (field)) return field; if (datum == C_C_D) { enum access_type access = compute_access (TYPE_BINFO (current_class_type), field); if (access == access_private) { cp_error ("field `%D' is private", field); return error_mark_node; } else if (access == access_protected) { cp_error ("field `%D' is protected", field); return error_mark_node; } } ref = build (COMPONENT_REF, TREE_TYPE (field), datum, field); if (TREE_READONLY (datum) || TREE_READONLY (field)) TREE_READONLY (ref) = 1; if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (field)) TREE_THIS_VOLATILE (ref) = 1; if (DECL_MUTABLE_P (field)) TREE_READONLY (ref) = 0; return ref; } /* Given a COND_EXPR in T, return it in a form that we can, for example, use as an lvalue. This code used to be in unary_complex_lvalue, but we needed it to deal with `a = (d == c) ? b : c' expressions, where we're dealing with aggregates. So, we now call this in unary_complex_lvalue, and in build_modify_expr. The case (in particular) that led to this was with CODE == ADDR_EXPR, since it's not an lvalue when we'd get it there. */ static tree rationalize_conditional_expr (code, t) enum tree_code code; tree t; { return build_conditional_expr (TREE_OPERAND (t, 0), build_unary_op (code, TREE_OPERAND (t, 1), 0), build_unary_op (code, TREE_OPERAND (t, 2), 0)); } tree build_component_ref (datum, component, basetype_path, protect) tree datum, component, basetype_path; int protect; { register tree basetype = TREE_TYPE (datum); register enum tree_code code = TREE_CODE (basetype); register tree field = NULL; register tree ref; /* If DATUM is a COMPOUND_EXPR or COND_EXPR, move our reference inside it. */ switch (TREE_CODE (datum)) { case COMPOUND_EXPR: { tree value = build_component_ref (TREE_OPERAND (datum, 1), component, basetype_path, protect); return build (COMPOUND_EXPR, TREE_TYPE (value), TREE_OPERAND (datum, 0), value); } case COND_EXPR: return build_conditional_expr (TREE_OPERAND (datum, 0), build_component_ref (TREE_OPERAND (datum, 1), component, basetype_path, protect), build_component_ref (TREE_OPERAND (datum, 2), component, basetype_path, protect)); } if (code == REFERENCE_TYPE) { #if 0 /* TREE_REFERENCE_EXPRs are not converted by `convert_from_reference'. @@ Maybe that is not right. */ if (TREE_REFERENCE_EXPR (datum)) datum = build1 (INDIRECT_REF, TREE_TYPE (basetype), datum); else #endif datum = convert_from_reference (datum); basetype = TREE_TYPE (datum); code = TREE_CODE (basetype); } /* First, see if there is a field or component with name COMPONENT. */ if (TREE_CODE (component) == TREE_LIST) { my_friendly_assert (!(TREE_CHAIN (component) == NULL_TREE && DECL_CHAIN (TREE_VALUE (component)) == NULL_TREE), 309); return build (COMPONENT_REF, TREE_TYPE (component), datum, component); } #if 0 if (TREE_CODE (component) == TYPE_EXPR) return build_component_type_expr (datum, component, NULL_TREE, protect); #endif if (! IS_AGGR_TYPE_CODE (code)) { if (code != ERROR_MARK) cp_error ("request for member `%D' in `%E', which is of non-aggregate type `%T'", component, datum, basetype); return error_mark_node; } if (TYPE_SIZE (basetype) == 0) { incomplete_type_error (0, basetype); return error_mark_node; } if (TREE_CODE (component) == BIT_NOT_EXPR) { if (TYPE_IDENTIFIER (basetype) != TREE_OPERAND (component, 0)) { cp_error ("destructor specifier `%T::~%T' must have matching names", basetype, TREE_OPERAND (component, 0)); return error_mark_node; } if (! TYPE_HAS_DESTRUCTOR (basetype)) { cp_error ("type `%T' has no destructor", basetype); return error_mark_node; } return TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (basetype), 0); } /* Look up component name in the structure type definition. */ if (CLASSTYPE_VFIELD (basetype) && DECL_NAME (CLASSTYPE_VFIELD (basetype)) == component) /* Special-case this because if we use normal lookups in an ambiguous hierarchy, the compiler will abort (because vptr lookups are not supposed to be ambiguous. */ field = CLASSTYPE_VFIELD (basetype); else { if (basetype_path == NULL_TREE) basetype_path = TYPE_BINFO (basetype); field = lookup_field (basetype_path, component, protect && ! VFIELD_NAME_P (component), 0); if (field == error_mark_node) return error_mark_node; if (field == NULL_TREE) { /* Not found as a data field, look for it as a method. If found, then if this is the only possible one, return it, else report ambiguity error. */ tree fndecls = lookup_fnfields (basetype_path, component, 1); if (fndecls == error_mark_node) return error_mark_node; if (fndecls) { if (TREE_CHAIN (fndecls) == NULL_TREE && DECL_CHAIN (TREE_VALUE (fndecls)) == NULL_TREE) { enum access_type access; tree fndecl; /* Unique, so use this one now. */ basetype = TREE_PURPOSE (fndecls); fndecl = TREE_VALUE (fndecls); access = compute_access (TREE_PURPOSE (fndecls), fndecl); if (access == access_public) { if (DECL_VINDEX (fndecl) && ! resolves_to_fixed_type_p (datum, 0)) { tree addr = build_unary_op (ADDR_EXPR, datum, 0); addr = convert_pointer_to (DECL_CONTEXT (fndecl), addr); datum = build_indirect_ref (addr, NULL_PTR); my_friendly_assert (datum != error_mark_node, 310); fndecl = build_vfn_ref (&addr, datum, DECL_VINDEX (fndecl)); } assemble_external (fndecl); return fndecl; } if (access == access_protected) cp_error ("member function `%D' is protected", fndecl); else cp_error ("member function `%D' is private", fndecl); return error_mark_node; } else { /* Just act like build_offset_ref, since the object does not matter unless we're actually calling the function. */ tree t; for (t = TREE_VALUE (fndecls); t; t = DECL_CHAIN (t)) assemble_external (t); t = build_tree_list (error_mark_node, fndecls); TREE_TYPE (t) = build_offset_type (basetype, unknown_type_node); return t; } } #if 0 if (component == ansi_opname[(int) TYPE_EXPR]) cp_error ("`%#T' has no such type conversion operator", basetype); else #endif cp_error ("`%#T' has no member named `%D'", basetype, component); return error_mark_node; } else if (TREE_TYPE (field) == error_mark_node) return error_mark_node; if (TREE_CODE (field) != FIELD_DECL) { if (TREE_CODE (field) == TYPE_DECL) { cp_error ("invalid use of type decl `%#D' as expression", field); return error_mark_node; } if (DECL_RTL (field) != 0) assemble_external (field); TREE_USED (field) = 1; return field; } } if (DECL_FIELD_CONTEXT (field) != basetype && TYPE_USES_COMPLEX_INHERITANCE (basetype)) { tree addr = build_unary_op (ADDR_EXPR, datum, 0); if (integer_zerop (addr)) { error ("invalid reference to NULL ptr, use ptr-to-member instead"); return error_mark_node; } addr = convert_pointer_to (DECL_FIELD_CONTEXT (field), addr); datum = build_indirect_ref (addr, NULL_PTR); my_friendly_assert (datum != error_mark_node, 311); } ref = fold (build (COMPONENT_REF, TREE_TYPE (field), break_out_cleanups (datum), field)); if (TREE_READONLY (datum) || TREE_READONLY (field)) TREE_READONLY (ref) = 1; if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (field)) TREE_THIS_VOLATILE (ref) = 1; if (DECL_MUTABLE_P (field)) TREE_READONLY (ref) = 0; return ref; } /* Given an expression PTR for a pointer, return an expression for the value pointed to. ERRORSTRING is the name of the operator to appear in error messages. This function may need to overload OPERATOR_FNNAME. Must also handle REFERENCE_TYPEs for C++. */ tree build_x_indirect_ref (ptr, errorstring) tree ptr; char *errorstring; { tree rval = build_opfncall (INDIRECT_REF, LOOKUP_NORMAL, ptr, NULL_TREE, NULL_TREE); if (rval) return rval; return build_indirect_ref (ptr, errorstring); } tree build_indirect_ref (ptr, errorstring) tree ptr; char *errorstring; { register tree pointer = (TREE_CODE (TREE_TYPE (ptr)) == REFERENCE_TYPE ? ptr : default_conversion (ptr)); register tree type = TREE_TYPE (pointer); if (ptr == current_class_decl) return C_C_D; if (IS_AGGR_TYPE (type)) { ptr = build_expr_type_conversion (WANT_POINTER, pointer, 1); if (ptr) { pointer = ptr; type = TREE_TYPE (pointer); } } if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE) { if (TREE_CODE (pointer) == ADDR_EXPR && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (pointer, 0))) == TYPE_MAIN_VARIANT (TREE_TYPE (type))) && (TREE_READONLY (TREE_OPERAND (pointer, 0)) == TYPE_READONLY (TREE_TYPE (type))) && (TREE_THIS_VOLATILE (TREE_OPERAND (pointer, 0)) == TYPE_VOLATILE (TREE_TYPE (type)))) return TREE_OPERAND (pointer, 0); else { tree t = TREE_TYPE (type); register tree ref = build1 (INDIRECT_REF, TYPE_MAIN_VARIANT (t), pointer); TREE_READONLY (ref) = TYPE_READONLY (t); TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t); TREE_SIDE_EFFECTS (ref) = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer); return ref; } } /* `pointer' won't be an error_mark_node if we were given a pointer to member, so it's cool to check for this here. */ else if (TYPE_PTRMEMFUNC_P (type)) error ("invalid use of `%s' on pointer to member function", errorstring); else if (TREE_CODE (type) == RECORD_TYPE && (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type))) error ("cannot dereference signature pointer/reference"); else if (pointer != error_mark_node) { if (errorstring) error ("invalid type argument of `%s'", errorstring); else error ("invalid type argument"); } return error_mark_node; } /* This handles expressions of the form "a[i]", which denotes an array reference. This is logically equivalent in C to *(a+i), but we may do it differently. If A is a variable or a member, we generate a primitive ARRAY_REF. This avoids forcing the array out of registers, and can work on arrays that are not lvalues (for example, members of structures returned by functions). If INDEX is of some user-defined type, it must be converted to integer type. Otherwise, to make a compatible PLUS_EXPR, it will inherit the type of the array, which will be some pointer type. */ tree build_x_array_ref (array, index) tree array, index; { tree rval = build_opfncall (ARRAY_REF, LOOKUP_NORMAL, array, index, NULL_TREE); if (rval) return rval; return build_array_ref (array, index); } tree build_array_ref (array, idx) tree array, idx; { tree itype; if (idx == 0) { error ("subscript missing in array reference"); return error_mark_node; } if (TREE_TYPE (array) == error_mark_node || TREE_TYPE (idx) == error_mark_node) return error_mark_node; itype = TREE_TYPE (idx); if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE && TREE_CODE (array) != INDIRECT_REF) { tree rval, type; /* Subscripting with type char is likely to lose on a machine where chars are signed. So warn on any machine, but optionally. Don't warn for unsigned char since that type is safe. Don't warn for signed char because anyone who uses that must have done so deliberately. */ if (warn_char_subscripts && TYPE_MAIN_VARIANT (TREE_TYPE (idx)) == char_type_node) warning ("array subscript has type `char'"); /* Apply default promotions *after* noticing character types. */ idx = default_conversion (idx); if (TREE_CODE (TREE_TYPE (idx)) != INTEGER_TYPE) { error ("array subscript is not an integer"); return error_mark_node; } /* An array that is indexed by a non-constant cannot be stored in a register; we must be able to do address arithmetic on its address. Likewise an array of elements of variable size. */ if (TREE_CODE (idx) != INTEGER_CST || (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array))) != 0 && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) != INTEGER_CST)) { if (mark_addressable (array) == 0) return error_mark_node; } /* An array that is indexed by a constant value which is not within the array bounds cannot be stored in a register either; because we would get a crash in store_bit_field/extract_bit_field when trying to access a non-existent part of the register. */ if (TREE_CODE (idx) == INTEGER_CST && TYPE_VALUES (TREE_TYPE (array)) && ! int_fits_type_p (idx, TYPE_VALUES (TREE_TYPE (array)))) { if (mark_addressable (array) == 0) return error_mark_node; } if (pedantic && !lvalue_p (array)) pedwarn ("ANSI C++ forbids subscripting non-lvalue array"); /* Note in C++ it is valid to subscript a `register' array, since it is valid to take the address of something with that storage specification. */ if (extra_warnings) { tree foo = array; while (TREE_CODE (foo) == COMPONENT_REF) foo = TREE_OPERAND (foo, 0); if (TREE_CODE (foo) == VAR_DECL && DECL_REGISTER (foo)) warning ("subscripting array declared `register'"); } type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (array))); rval = build (ARRAY_REF, type, array, idx); /* Array ref is const/volatile if the array elements are or if the array is.. */ TREE_READONLY (rval) |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array))) | TREE_READONLY (array)); TREE_SIDE_EFFECTS (rval) |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | TREE_SIDE_EFFECTS (array)); TREE_THIS_VOLATILE (rval) |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) /* This was added by rms on 16 Nov 91. It fixes vol struct foo *a; a->elts[1] in an inline function. Hope it doesn't break something else. */ | TREE_THIS_VOLATILE (array)); return require_complete_type (fold (rval)); } { tree ar = default_conversion (array); tree ind = default_conversion (idx); /* Put the integer in IND to simplify error checking. */ if (TREE_CODE (TREE_TYPE (ar)) == INTEGER_TYPE) { tree temp = ar; ar = ind; ind = temp; } if (ar == error_mark_node) return ar; if (TREE_CODE (TREE_TYPE (ar)) != POINTER_TYPE) { error ("subscripted value is neither array nor pointer"); return error_mark_node; } if (TREE_CODE (TREE_TYPE (ind)) != INTEGER_TYPE) { error ("array subscript is not an integer"); return error_mark_node; } return build_indirect_ref (build_binary_op_nodefault (PLUS_EXPR, ar, ind, PLUS_EXPR), "array indexing"); } } /* Build a function call to function FUNCTION with parameters PARAMS. PARAMS is a list--a chain of TREE_LIST nodes--in which the TREE_VALUE of each node is a parameter-expression. FUNCTION's data type may be a function type or a pointer-to-function. For C++: If FUNCTION's data type is a TREE_LIST, then the tree list is the list of possible methods that FUNCTION could conceivably be. If the list of methods comes from a class, then it will be a list of lists (where each element is associated with the class that produced it), otherwise it will be a simple list (for functions overloaded in global scope). In the first case, TREE_VALUE (function) is the head of one of those lists, and TREE_PURPOSE is the name of the function. In the second case, TREE_PURPOSE (function) is the function's name directly. DECL is the class instance variable, usually CURRENT_CLASS_DECL. */ /* * [eichin:19911015.1726EST] actually return a possibly incomplete * type */ tree build_x_function_call (function, params, decl) tree function, params, decl; { tree type; int is_method; if (function == error_mark_node) return error_mark_node; type = TREE_TYPE (function); is_method = ((TREE_CODE (function) == TREE_LIST && current_class_type != NULL_TREE && IDENTIFIER_CLASS_VALUE (TREE_PURPOSE (function)) == function) || TREE_CODE (function) == IDENTIFIER_NODE || TREE_CODE (type) == METHOD_TYPE || TYPE_PTRMEMFUNC_P (type)); /* Handle methods, friends, and overloaded functions, respectively. */ if (is_method) { if (TREE_CODE (function) == FUNCTION_DECL) { if (DECL_NAME (function)) function = DECL_NAME (function); else function = TYPE_IDENTIFIER (DECL_CLASS_CONTEXT (function)); } else if (TREE_CODE (function) == TREE_LIST) { #if 0 if (TREE_CODE (TREE_VALUE (function)) == TREE_LIST) function = TREE_PURPOSE (TREE_VALUE (function)); else function = TREE_PURPOSE (function); #else my_friendly_assert (TREE_CODE (TREE_VALUE (function)) == FUNCTION_DECL, 312); function = TREE_PURPOSE (function); #endif } else if (TREE_CODE (function) != IDENTIFIER_NODE) { if (TREE_CODE (function) == OFFSET_REF) { if (TREE_OPERAND (function, 0)) decl = TREE_OPERAND (function, 0); } /* Call via a pointer to member function. */ if (decl == NULL_TREE) { error ("pointer to member function called, but not in class scope"); return error_mark_node; } /* What other type of POINTER_TYPE could this be? */ if (TREE_CODE (TREE_TYPE (function)) != POINTER_TYPE && ! TYPE_PTRMEMFUNC_P (TREE_TYPE (function)) && TREE_CODE (function) != OFFSET_REF) function = build (OFFSET_REF, TREE_TYPE (type), NULL_TREE, function); goto do_x_function; } /* this is an abbreviated method call. must go through here in case it is a virtual function. @@ Perhaps this could be optimized. */ if (decl == NULL_TREE) { if (current_class_type == NULL_TREE) { error ("object missing in call to method `%s'", IDENTIFIER_POINTER (function)); return error_mark_node; } /* Yow: call from a static member function. */ decl = build1 (NOP_EXPR, build_pointer_type (current_class_type), error_mark_node); decl = build_indirect_ref (decl, NULL_PTR); } return build_method_call (decl, function, params, NULL_TREE, LOOKUP_NORMAL); } else if (TREE_CODE (function) == COMPONENT_REF && type == unknown_type_node) { /* Should we undo what was done in build_component_ref? */ if (TREE_CODE (TREE_PURPOSE (TREE_OPERAND (function, 1))) == TREE_VEC) /* Get the name that build_component_ref hid. */ function = DECL_NAME (TREE_VALUE (TREE_OPERAND (function, 1))); else function = TREE_PURPOSE (TREE_OPERAND (function, 1)); return build_method_call (decl, function, params, NULL_TREE, LOOKUP_NORMAL); } else if (TREE_CODE (function) == TREE_LIST) { if (TREE_VALUE (function) == NULL_TREE) { cp_error ("function `%D' declared overloaded, but no definitions appear with which to resolve it?!?", TREE_PURPOSE (function)); return error_mark_node; } else { tree val = TREE_VALUE (function); if (TREE_CODE (val) == TEMPLATE_DECL) return build_overload_call_maybe (function, params, LOOKUP_COMPLAIN, (struct candidate *)0); else if (DECL_CHAIN (val) != NULL_TREE) return build_overload_call (function, params, LOOKUP_COMPLAIN, (struct candidate *)0); else my_friendly_abort (360); } } do_x_function: if (TREE_CODE (function) == OFFSET_REF) { /* If the component is a data element (or a virtual function), we play games here to make things work. */ tree decl_addr; if (TREE_OPERAND (function, 0)) decl = TREE_OPERAND (function, 0); else decl = C_C_D; decl_addr = build_unary_op (ADDR_EXPR, decl, 0); function = get_member_function_from_ptrfunc (&decl_addr, TREE_OPERAND (function, 1)); params = tree_cons (NULL_TREE, decl_addr, params); return build_function_call (function, params); } type = TREE_TYPE (function); if (type != error_mark_node) { if (TREE_CODE (type) == REFERENCE_TYPE) type = TREE_TYPE (type); if (TYPE_LANG_SPECIFIC (type) && TYPE_OVERLOADS_CALL_EXPR (type)) return build_opfncall (CALL_EXPR, LOOKUP_NORMAL, function, params, NULL_TREE); } if (is_method) { tree fntype = TREE_TYPE (function); tree ctypeptr; /* Explicitly named method? */ if (TREE_CODE (function) == FUNCTION_DECL) ctypeptr = build_pointer_type (DECL_CLASS_CONTEXT (function)); /* Expression with ptr-to-method type? It could either be a plain usage, or it might be a case where the ptr-to-method is being passed in as an argument. */ else if (TYPE_PTRMEMFUNC_P (fntype)) { tree rec = TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (fntype))); ctypeptr = build_pointer_type (rec); } /* Unexpected node type? */ else my_friendly_abort (116); if (decl == NULL_TREE) { if (current_function_decl && DECL_STATIC_FUNCTION_P (current_function_decl)) error ("invalid call to member function needing `this' in static member function scope"); else error ("pointer to member function called, but not in class scope"); return error_mark_node; } if (TREE_CODE (TREE_TYPE (decl)) != POINTER_TYPE && ! TYPE_PTRMEMFUNC_P (TREE_TYPE (decl))) { decl = build_unary_op (ADDR_EXPR, decl, 0); decl = convert_pointer_to (TREE_TYPE (ctypeptr), decl); } else decl = build_c_cast (ctypeptr, decl, 0); params = tree_cons (NULL_TREE, decl, params); } return build_function_call (function, params); } /* Resolve a pointer to member function. INSTANCE is the object instance to use, if the member points to a virtual member. */ tree get_member_function_from_ptrfunc (instance_ptrptr, function) tree *instance_ptrptr; tree function; { if (TREE_CODE (function) == OFFSET_REF) { function = TREE_OPERAND (function, 1); } if (TYPE_PTRMEMFUNC_P (TREE_TYPE (function))) { tree fntype, index, e1, delta, delta2, e2, e3, aref, vtbl; tree instance; tree instance_ptr = *instance_ptrptr; if (TREE_SIDE_EFFECTS (instance_ptr)) instance_ptr = save_expr (instance_ptr); if (TREE_SIDE_EFFECTS (function)) function = save_expr (function); fntype = TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (function)); index = save_expr (build_component_ref (function, index_identifier, 0, 0)); e1 = build (GT_EXPR, boolean_type_node, index, convert (delta_type_node, integer_zero_node)); delta = convert (ptrdiff_type_node, build_component_ref (function, delta_identifier, 0, 0)); delta2 = DELTA2_FROM_PTRMEMFUNC (function); /* convert down to the right base, before using the instance. */ instance = convert_pointer_to_real (TYPE_METHOD_BASETYPE (TREE_TYPE (fntype)), instance_ptr); if (instance == error_mark_node) return instance; vtbl = convert_pointer_to (ptr_type_node, instance); vtbl = build (PLUS_EXPR, build_pointer_type (build_pointer_type (vtable_entry_type)), vtbl, convert (ptrdiff_type_node, delta2)); vtbl = build_indirect_ref (vtbl, NULL_PTR); aref = build_array_ref (vtbl, build_binary_op (MINUS_EXPR, index, integer_one_node, 1)); if (! flag_vtable_thunks) { aref = save_expr (aref); /* Save the intermediate result in a SAVE_EXPR so we don't have to compute each component of the virtual function pointer twice. */ if (/* !building_cleanup && */ TREE_CODE (aref) == INDIRECT_REF) TREE_OPERAND (aref, 0) = save_expr (TREE_OPERAND (aref, 0)); delta = build_binary_op (PLUS_EXPR, build_conditional_expr (e1, build_component_ref (aref, delta_identifier, 0, 0), integer_zero_node), delta, 1); } *instance_ptrptr = build (PLUS_EXPR, TREE_TYPE (instance_ptr), instance_ptr, delta); if (flag_vtable_thunks) e2 = aref; else e2 = build_component_ref (aref, pfn_identifier, 0, 0); e3 = PFN_FROM_PTRMEMFUNC (function); TREE_TYPE (e2) = TREE_TYPE (e3); function = build_conditional_expr (e1, e2, e3); /* Make sure this doesn't get evaluated first inside one of the branches of the COND_EXPR. */ if (TREE_CODE (instance_ptr) == SAVE_EXPR) function = build (COMPOUND_EXPR, TREE_TYPE (function), instance_ptr, function); } return function; } tree build_function_call_real (function, params, require_complete, flags) tree function, params; int require_complete, flags; { register tree fntype, fndecl; register tree value_type; register tree coerced_params; tree name = NULL_TREE, assembler_name = NULL_TREE; int is_method; /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. Strip such NOP_EXPRs, since FUNCTION is used in non-lvalue context. */ if (TREE_CODE (function) == NOP_EXPR && TREE_TYPE (function) == TREE_TYPE (TREE_OPERAND (function, 0))) function = TREE_OPERAND (function, 0); if (TREE_CODE (function) == FUNCTION_DECL) { name = DECL_NAME (function); assembler_name = DECL_ASSEMBLER_NAME (function); GNU_xref_call (current_function_decl, IDENTIFIER_POINTER (name ? name : TYPE_IDENTIFIER (DECL_CLASS_CONTEXT (function)))); assemble_external (function); fndecl = function; /* Convert anything with function type to a pointer-to-function. */ if (pedantic && name && IDENTIFIER_LENGTH (name) == 4 && ! strcmp (IDENTIFIER_POINTER (name), "main") && DECL_CONTEXT (function) == NULL_TREE) { pedwarn ("ANSI C++ forbids calling `main' from within program"); } if (pedantic && DECL_THIS_INLINE (function) && ! DECL_INITIAL (function) && ! DECL_ARTIFICIAL (function) && ! DECL_PENDING_INLINE_INFO (function)) cp_pedwarn ("inline function `%#D' called before definition", function); /* Differs from default_conversion by not setting TREE_ADDRESSABLE (because calling an inline function does not mean the function needs to be separately compiled). */ if (DECL_INLINE (function)) { /* Is it a synthesized method that needs to be synthesized? */ if (DECL_ARTIFICIAL (function) && ! flag_no_inline && ! DECL_INITIAL (function) /* Kludge: don't synthesize for default args. */ && current_function_decl) synthesize_method (function); fntype = build_type_variant (TREE_TYPE (function), TREE_READONLY (function), TREE_THIS_VOLATILE (function)); function = build1 (ADDR_EXPR, build_pointer_type (fntype), function); } else { assemble_external (function); TREE_USED (function) = 1; function = default_conversion (function); } } else { fndecl = NULL_TREE; /* Convert anything with function type to a pointer-to-function. */ if (function == error_mark_node) return error_mark_node; function = default_conversion (function); } fntype = TREE_TYPE (function); if (TYPE_PTRMEMFUNC_P (fntype)) { tree instance_ptr = build_unary_op (ADDR_EXPR, C_C_D, 0); fntype = TYPE_PTRMEMFUNC_FN_TYPE (fntype); function = get_member_function_from_ptrfunc (&instance_ptr, function); } is_method = (TREE_CODE (fntype) == POINTER_TYPE && TREE_CODE (TREE_TYPE (fntype)) == METHOD_TYPE); if (!((TREE_CODE (fntype) == POINTER_TYPE && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE) || is_method)) { cp_error ("`%E' cannot be used as a function", function); return error_mark_node; } /* fntype now gets the type of function pointed to. */ fntype = TREE_TYPE (fntype); /* Convert the parameters to the types declared in the function prototype, or apply default promotions. */ if (flags & LOOKUP_COMPLAIN) coerced_params = convert_arguments (NULL_TREE, TYPE_ARG_TYPES (fntype), params, fndecl, LOOKUP_NORMAL); else coerced_params = convert_arguments (NULL_TREE, TYPE_ARG_TYPES (fntype), params, fndecl, 0); if (coerced_params == error_mark_node) if (flags & LOOKUP_SPECULATIVELY) return NULL_TREE; else return error_mark_node; /* Check for errors in format strings. */ if (warn_format && (name || assembler_name)) check_function_format (name, assembler_name, coerced_params); /* Recognize certain built-in functions so we can make tree-codes other than CALL_EXPR. We do this when it enables fold-const.c to do something useful. */ if (TREE_CODE (function) == ADDR_EXPR && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL && DECL_BUILT_IN (TREE_OPERAND (function, 0))) switch (DECL_FUNCTION_CODE (TREE_OPERAND (function, 0))) { case BUILT_IN_ABS: case BUILT_IN_LABS: case BUILT_IN_FABS: if (coerced_params == 0) return integer_zero_node; return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0); } /* C++ */ value_type = TREE_TYPE (fntype) ? TREE_TYPE (fntype) : void_type_node; { register tree result = build (CALL_EXPR, value_type, function, coerced_params, NULL_TREE); TREE_SIDE_EFFECTS (result) = 1; if (! require_complete) return convert_from_reference (result); if (value_type == void_type_node) return result; result = require_complete_type (result); return convert_from_reference (result); } } tree build_function_call (function, params) tree function, params; { return build_function_call_real (function, params, 1, LOOKUP_NORMAL); } tree build_function_call_maybe (function, params) tree function, params; { return build_function_call_real (function, params, 0, 0); } /* Convert the actual parameter expressions in the list VALUES to the types in the list TYPELIST. If parmdecls is exhausted, or when an element has NULL as its type, perform the default conversions. RETURN_LOC is the location of the return value, if known, NULL_TREE otherwise. This is useful in the case where we can avoid creating a temporary variable in the case where we can initialize the return value directly. If we are not eliding constructors, then we set this to NULL_TREE to avoid this avoidance. NAME is an IDENTIFIER_NODE or 0. It is used only for error messages. This is also where warnings about wrong number of args are generated. Return a list of expressions for the parameters as converted. Both VALUES and the returned value are chains of TREE_LIST nodes with the elements of the list in the TREE_VALUE slots of those nodes. In C++, unspecified trailing parameters can be filled in with their default arguments, if such were specified. Do so here. */ tree convert_arguments (return_loc, typelist, values, fndecl, flags) tree return_loc, typelist, values, fndecl; int flags; { extern tree gc_protect_fndecl; register tree typetail, valtail; register tree result = NULL_TREE; char *called_thing; int i = 0; if (! flag_elide_constructors) return_loc = 0; if (fndecl) { if (TREE_CODE (TREE_TYPE (fndecl)) == METHOD_TYPE) { if (DECL_NAME (fndecl) == NULL_TREE || IDENTIFIER_HAS_TYPE_VALUE (DECL_NAME (fndecl))) called_thing = "constructor"; else called_thing = "member function"; } else called_thing = "function"; } for (valtail = values, typetail = typelist; valtail; valtail = TREE_CHAIN (valtail), i++) { register tree type = typetail ? TREE_VALUE (typetail) : 0; register tree val = TREE_VALUE (valtail); if (val == error_mark_node) return error_mark_node; if (type == void_type_node) { if (fndecl) { char *buf = (char *)alloca (40 + strlen (called_thing)); sprintf (buf, "too many arguments to %s `%%s'", called_thing); error_with_decl (fndecl, buf); error ("at this point in file"); } else error ("too many arguments to function"); /* In case anybody wants to know if this argument list is valid. */ if (result) TREE_TYPE (tree_last (result)) = error_mark_node; break; } /* The tree type of the parameter being passed may not yet be known. In this case, its type is TYPE_UNKNOWN, and will be instantiated by the type given by TYPE. If TYPE is also NULL, the tree type of VAL is ERROR_MARK_NODE. */ if (type && type_unknown_p (val)) val = require_instantiated_type (type, val, integer_zero_node); else if (type_unknown_p (val)) { /* Strip the `&' from an overloaded FUNCTION_DECL. */ if (TREE_CODE (val) == ADDR_EXPR) val = TREE_OPERAND (val, 0); if (TREE_CODE (val) == TREE_LIST && TREE_CHAIN (val) == NULL_TREE && TREE_TYPE (TREE_VALUE (val)) != NULL_TREE && (TREE_TYPE (val) == unknown_type_node || DECL_CHAIN (TREE_VALUE (val)) == NULL_TREE)) /* Instantiates automatically. */ val = TREE_VALUE (val); else { error ("insufficient type information in parameter list"); val = integer_zero_node; } } else if (TREE_CODE (val) == OFFSET_REF && TREE_CODE (TREE_TYPE (val)) == METHOD_TYPE) { /* This is unclean. Should be handled elsewhere. */ val = build_unary_op (ADDR_EXPR, val, 0); } else if (TREE_CODE (val) == OFFSET_REF) val = resolve_offset_ref (val); { #if 0 /* This code forces the assumption that if we have a ptr-to-func type in an arglist, that every routine that wants to check its validity has done so, and thus we need not do any more conversion. I don't remember why this is necessary. */ else if (TREE_CODE (ttype) == FUNCTION_TYPE && (type == NULL || TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE || TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)) { type = build_pointer_type (ttype); } #endif } /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. Strip such NOP_EXPRs, since VAL is used in non-lvalue context. */ if (TREE_CODE (val) == NOP_EXPR && TREE_TYPE (val) == TREE_TYPE (TREE_OPERAND (val, 0)) && (type == 0 || TREE_CODE (type) != REFERENCE_TYPE)) val = TREE_OPERAND (val, 0); if (type == 0 || TREE_CODE (type) != REFERENCE_TYPE) { if (TREE_CODE (TREE_TYPE (val)) == ARRAY_TYPE || TREE_CODE (TREE_TYPE (val)) == FUNCTION_TYPE || TREE_CODE (TREE_TYPE (val)) == METHOD_TYPE) val = default_conversion (val); val = require_complete_type (val); } if (val == error_mark_node) return error_mark_node; if (type != 0) { /* Formal parm type is specified by a function prototype. */ tree parmval; if (TYPE_SIZE (type) == 0) { error ("parameter type of called function is incomplete"); parmval = val; } else { #if 0 && defined (PROMOTE_PROTOTYPES) /* This breaks user-defined conversions. */ /* Rather than truncating and then reextending, convert directly to int, if that's the type we will want. */ if (! flag_traditional && (TREE_CODE (type) == INTEGER_TYPE || TREE_CODE (type) == ENUMERAL_TYPE) && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) type = integer_type_node; #endif parmval = convert_for_initialization (return_loc, type, val, flags, "argument passing", fndecl, i); #ifdef PROMOTE_PROTOTYPES if ((TREE_CODE (type) == INTEGER_TYPE || TREE_CODE (type) == ENUMERAL_TYPE) && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) parmval = default_conversion (parmval); #endif } if (parmval == error_mark_node) return error_mark_node; result = tree_cons (NULL_TREE, parmval, result); } else { if (TREE_CODE (TREE_TYPE (val)) == REFERENCE_TYPE) val = convert_from_reference (val); if (TREE_CODE (TREE_TYPE (val)) == REAL_TYPE && (TYPE_PRECISION (TREE_TYPE (val)) < TYPE_PRECISION (double_type_node))) /* Convert `float' to `double'. */ result = tree_cons (NULL_TREE, convert (double_type_node, val), result); else if (TYPE_LANG_SPECIFIC (TREE_TYPE (val)) && ! TYPE_HAS_TRIVIAL_INIT_REF (TREE_TYPE (val))) { cp_warning ("cannot pass objects of type `%T' through `...'", TREE_TYPE (val)); result = tree_cons (NULL_TREE, val, result); } else /* Convert `short' and `char' to full-size `int'. */ result = tree_cons (NULL_TREE, default_conversion (val), result); } if (flag_gc /* There are certain functions for which we don't need to protect our arguments. GC_PROTECT_FNDECL is one. */ && fndecl != gc_protect_fndecl && type_needs_gc_entry (TREE_TYPE (TREE_VALUE (result))) && ! value_safe_from_gc (NULL_TREE, TREE_VALUE (result))) /* This will build a temporary variable whose cleanup is to clear the obstack entry. */ TREE_VALUE (result) = protect_value_from_gc (NULL_TREE, TREE_VALUE (result)); if (typetail) typetail = TREE_CHAIN (typetail); } if (typetail != 0 && typetail != void_list_node) { /* See if there are default arguments that can be used */ if (TREE_PURPOSE (typetail)) { for (; typetail != void_list_node; ++i) { tree type = TREE_VALUE (typetail); tree val = break_out_target_exprs (TREE_PURPOSE (typetail)); tree parmval; if (val == NULL_TREE) parmval = error_mark_node; else if (TREE_CODE (val) == CONSTRUCTOR) { parmval = digest_init (type, val, (tree *)0); parmval = convert_for_initialization (return_loc, type, parmval, flags, "default constructor", fndecl, i); } else { /* This could get clobbered by the following call. */ if (TREE_HAS_CONSTRUCTOR (val)) val = copy_node (val); parmval = convert_for_initialization (return_loc, type, val, flags, "default argument", fndecl, i); #ifdef PROMOTE_PROTOTYPES if ((TREE_CODE (type) == INTEGER_TYPE || TREE_CODE (type) == ENUMERAL_TYPE) && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) parmval = default_conversion (parmval); #endif } if (parmval == error_mark_node) return error_mark_node; if (flag_gc && type_needs_gc_entry (TREE_TYPE (parmval)) && ! value_safe_from_gc (NULL_TREE, parmval)) parmval = protect_value_from_gc (NULL_TREE, parmval); result = tree_cons (0, parmval, result); typetail = TREE_CHAIN (typetail); /* ends with `...'. */ if (typetail == NULL_TREE) break; } } else { if (fndecl) { char *buf = (char *)alloca (32 + strlen (called_thing)); sprintf (buf, "too few arguments to %s `%%#D'", called_thing); cp_error_at (buf, fndecl); error ("at this point in file"); } else error ("too few arguments to function"); return error_mark_list; } } return nreverse (result); } /* Build a binary-operation expression, after performing default conversions on the operands. CODE is the kind of expression to build. */ tree build_x_binary_op (code, arg1, arg2) enum tree_code code; tree arg1, arg2; { tree rval = build_opfncall (code, LOOKUP_SPECULATIVELY, arg1, arg2, NULL_TREE); if (rval) return build_opfncall (code, LOOKUP_NORMAL, arg1, arg2, NULL_TREE); if (code == MEMBER_REF) return build_m_component_ref (build_indirect_ref (arg1, NULL_PTR), arg2); return build_binary_op (code, arg1, arg2, 1); } tree build_binary_op (code, arg1, arg2, convert_p) enum tree_code code; tree arg1, arg2; int convert_p; { tree args[2]; args[0] = arg1; args[1] = arg2; if (convert_p) { tree args_save [2]; tree type0, type1; args[0] = decay_conversion (args[0]); args[1] = decay_conversion (args[1]); if (args[0] == error_mark_node || args[1] == error_mark_node) return error_mark_node; type0 = TREE_TYPE (args[0]); type1 = TREE_TYPE (args[1]); if (type_unknown_p (args[0])) { args[0] = instantiate_type (type1, args[0], 1); args[0] = decay_conversion (args[0]); } else if (type_unknown_p (args[1])) { args[1] = require_instantiated_type (type0, args[1], error_mark_node); args[1] = decay_conversion (args[1]); } if (IS_AGGR_TYPE (type0) || IS_AGGR_TYPE (type1)) { /* Try to convert this to something reasonable. */ if (! build_default_binary_type_conversion(code, &args[0], &args[1])) { cp_error ("no match for `%O(%#T, %#T)'", code, TREE_TYPE (arg1), TREE_TYPE (arg2)); return error_mark_node; } } } return build_binary_op_nodefault (code, args[0], args[1], code); } /* Build a binary-operation expression without default conversions. CODE is the kind of expression to build. This function differs from `build' in several ways: the data type of the result is computed and recorded in it, warnings are generated if arg data types are invalid, special handling for addition and subtraction of pointers is known, and some optimization is done (operations on narrow ints are done in the narrower type when that gives the same result). Constant folding is also done before the result is returned. ERROR_CODE is the code that determines what to say in error messages. It is usually, but not always, the same as CODE. Note that the operands will never have enumeral types because either they have just had the default conversions performed or they have both just been converted to some other type in which the arithmetic is to be done. C++: must do special pointer arithmetic when implementing multiple inheritance, and deal with pointer to member functions. */ tree build_binary_op_nodefault (code, orig_op0, orig_op1, error_code) enum tree_code code; tree orig_op0, orig_op1; enum tree_code error_code; { tree op0, op1; register enum tree_code code0, code1; tree type0, type1; /* Expression code to give to the expression when it is built. Normally this is CODE, which is what the caller asked for, but in some special cases we change it. */ register enum tree_code resultcode = code; /* Data type in which the computation is to be performed. In the simplest cases this is the common type of the arguments. */ register tree result_type = NULL; /* Nonzero means operands have already been type-converted in whatever way is necessary. Zero means they need to be converted to RESULT_TYPE. */ int converted = 0; /* Nonzero means create the expression with this type, rather than RESULT_TYPE. */ tree build_type = 0; /* Nonzero means after finally constructing the expression convert it to this type. */ tree final_type = 0; /* Nonzero if this is an operation like MIN or MAX which can safely be computed in short if both args are promoted shorts. Also implies COMMON. -1 indicates a bitwise operation; this makes a difference in the exact conditions for when it is safe to do the operation in a narrower mode. */ int shorten = 0; /* Nonzero if this is a comparison operation; if both args are promoted shorts, compare the original shorts. Also implies COMMON. */ int short_compare = 0; /* Nonzero if this is a right-shift operation, which can be computed on the original short and then promoted if the operand is a promoted short. */ int short_shift = 0; /* Nonzero means set RESULT_TYPE to the common type of the args. */ int common = 0; /* Apply default conversions. */ if (code == TRUTH_AND_EXPR || code == TRUTH_ANDIF_EXPR || code == TRUTH_OR_EXPR || code == TRUTH_ORIF_EXPR || code == TRUTH_XOR_EXPR) { op0 = decay_conversion (orig_op0); op1 = decay_conversion (orig_op1); } else { op0 = default_conversion (orig_op0); op1 = default_conversion (orig_op1); } type0 = TREE_TYPE (op0); type1 = TREE_TYPE (op1); /* The expression codes of the data types of the arguments tell us whether the arguments are integers, floating, pointers, etc. */ code0 = TREE_CODE (type0); code1 = TREE_CODE (type1); /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ STRIP_TYPE_NOPS (op0); STRIP_TYPE_NOPS (op1); /* If an error was already reported for one of the arguments, avoid reporting another error. */ if (code0 == ERROR_MARK || code1 == ERROR_MARK) return error_mark_node; switch (code) { case PLUS_EXPR: /* Handle the pointer + int case. */ if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) return pointer_int_sum (PLUS_EXPR, op0, op1); else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE) return pointer_int_sum (PLUS_EXPR, op1, op0); else common = 1; break; case MINUS_EXPR: /* Subtraction of two similar pointers. We must subtract them as integers, then divide by object size. */ if (code0 == POINTER_TYPE && code1 == POINTER_TYPE && comp_target_types (type0, type1, 1)) return pointer_diff (op0, op1); /* Handle pointer minus int. Just like pointer plus int. */ else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) return pointer_int_sum (MINUS_EXPR, op0, op1); else common = 1; break; case MULT_EXPR: common = 1; break; case TRUNC_DIV_EXPR: case CEIL_DIV_EXPR: case FLOOR_DIV_EXPR: case ROUND_DIV_EXPR: case EXACT_DIV_EXPR: if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) { if (TREE_CODE (op1) == INTEGER_CST && integer_zerop (op1)) cp_warning ("division by zero in `%E / 0'", op0); else if (TREE_CODE (op1) == REAL_CST && real_zerop (op1)) cp_warning ("division by zero in `%E / 0.'", op0); if (!(code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)) resultcode = RDIV_EXPR; else /* When dividing two signed integers, we have to promote to int. unless we divide by a constant != -1. Note that default conversion will have been performed on the operands at this point, so we have to dig out the original type to find out if it was unsigned. */ shorten = ((TREE_CODE (op0) == NOP_EXPR && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) || (TREE_CODE (op1) == INTEGER_CST && (TREE_INT_CST_LOW (op1) != -1 || TREE_INT_CST_HIGH (op1) != -1))); common = 1; } break; case BIT_AND_EXPR: case BIT_ANDTC_EXPR: case BIT_IOR_EXPR: case BIT_XOR_EXPR: if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) shorten = -1; /* If one operand is a constant, and the other is a short type that has been converted to an int, really do the work in the short type and then convert the result to int. If we are lucky, the constant will be 0 or 1 in the short type, making the entire operation go away. */ if (TREE_CODE (op0) == INTEGER_CST && TREE_CODE (op1) == NOP_EXPR && TYPE_PRECISION (type1) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op1, 0))) && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op1, 0)))) { final_type = result_type; op1 = TREE_OPERAND (op1, 0); result_type = TREE_TYPE (op1); } if (TREE_CODE (op1) == INTEGER_CST && TREE_CODE (op0) == NOP_EXPR && TYPE_PRECISION (type0) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0, 0))) && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) { final_type = result_type; op0 = TREE_OPERAND (op0, 0); result_type = TREE_TYPE (op0); } break; case TRUNC_MOD_EXPR: case FLOOR_MOD_EXPR: if (code1 == INTEGER_TYPE && integer_zerop (op1)) cp_warning ("division by zero in `%E % 0'", op0); else if (code1 == REAL_TYPE && real_zerop (op1)) cp_warning ("division by zero in `%E % 0.'", op0); if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) { /* Although it would be tempting to shorten always here, that loses on some targets, since the modulo instruction is undefined if the quotient can't be represented in the computation mode. We shorten only if unsigned or if dividing by something we know != -1. */ shorten = ((TREE_CODE (op0) == NOP_EXPR && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) || (TREE_CODE (op1) == INTEGER_CST && (TREE_INT_CST_LOW (op1) != -1 || TREE_INT_CST_HIGH (op1) != -1))); common = 1; } break; case TRUTH_ANDIF_EXPR: case TRUTH_ORIF_EXPR: case TRUTH_AND_EXPR: case TRUTH_OR_EXPR: result_type = boolean_type_node; break; /* Shift operations: result has same type as first operand; always convert second operand to int. Also set SHORT_SHIFT if shifting rightward. */ case RSHIFT_EXPR: if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) { result_type = type0; if (TREE_CODE (op1) == INTEGER_CST) { if (tree_int_cst_lt (op1, integer_zero_node)) warning ("right shift count is negative"); else { if (TREE_INT_CST_LOW (op1) | TREE_INT_CST_HIGH (op1)) short_shift = 1; if (TREE_INT_CST_HIGH (op1) != 0 || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) >= TYPE_PRECISION (type0))) warning ("right shift count >= width of type"); } } /* Convert the shift-count to an integer, regardless of size of value being shifted. */ if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) op1 = convert (integer_type_node, op1); /* Avoid converting op1 to result_type later. */ converted = 1; } break; case LSHIFT_EXPR: if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) { result_type = type0; if (TREE_CODE (op1) == INTEGER_CST) { if (tree_int_cst_lt (op1, integer_zero_node)) warning ("left shift count is negative"); else if (TREE_INT_CST_HIGH (op1) != 0 || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) >= TYPE_PRECISION (type0))) warning ("left shift count >= width of type"); } /* Convert the shift-count to an integer, regardless of size of value being shifted. */ if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) op1 = convert (integer_type_node, op1); /* Avoid converting op1 to result_type later. */ converted = 1; } break; case RROTATE_EXPR: case LROTATE_EXPR: if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) { result_type = type0; if (TREE_CODE (op1) == INTEGER_CST) { if (tree_int_cst_lt (op1, integer_zero_node)) warning ("%s rotate count is negative", (code == LROTATE_EXPR) ? "left" : "right"); else if (TREE_INT_CST_HIGH (op1) != 0 || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) >= TYPE_PRECISION (type0))) warning ("%s rotate count >= width of type", (code == LROTATE_EXPR) ? "left" : "right"); } /* Convert the shift-count to an integer, regardless of size of value being shifted. */ if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) op1 = convert (integer_type_node, op1); } break; case EQ_EXPR: case NE_EXPR: build_type = boolean_type_node; if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) short_compare = 1; else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) { register tree tt0 = TYPE_MAIN_VARIANT (TREE_TYPE (type0)); register tree tt1 = TYPE_MAIN_VARIANT (TREE_TYPE (type1)); if (comp_target_types (type0, type1, 1)) result_type = common_type (type0, type1); else if (tt0 == void_type_node) { if (pedantic && TREE_CODE (tt1) == FUNCTION_TYPE && tree_int_cst_lt (TYPE_SIZE (type0), TYPE_SIZE (type1))) pedwarn ("ANSI C++ forbids comparison of `void *' with function pointer"); else if (TREE_CODE (tt1) == OFFSET_TYPE) pedwarn ("ANSI C++ forbids conversion of a pointer to member to `void *'"); } else if (tt1 == void_type_node) { if (pedantic && TREE_CODE (tt0) == FUNCTION_TYPE && tree_int_cst_lt (TYPE_SIZE (type1), TYPE_SIZE (type0))) pedwarn ("ANSI C++ forbids comparison of `void *' with function pointer"); } else cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast", type0, type1); if (result_type == NULL_TREE) result_type = ptr_type_node; } else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST && integer_zerop (op1)) result_type = type0; else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST && integer_zerop (op0)) result_type = type1; else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) { result_type = type0; error ("ANSI C++ forbids comparison between pointer and integer"); } else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) { result_type = type1; error ("ANSI C++ forbids comparison between pointer and integer"); } else if (TYPE_PTRMEMFUNC_P (type0) && TREE_CODE (op1) == INTEGER_CST && integer_zerop (op1)) { op0 = build_component_ref (op0, index_identifier, 0, 0); op1 = integer_zero_node; result_type = TREE_TYPE (op0); } else if (TYPE_PTRMEMFUNC_P (type1) && TREE_CODE (op0) == INTEGER_CST && integer_zerop (op0)) { op0 = build_component_ref (op1, index_identifier, 0, 0); op1 = integer_zero_node; result_type = TREE_TYPE (op0); } else if (TYPE_PTRMEMFUNC_P (type0) && TYPE_PTRMEMFUNC_P (type1) && (TYPE_PTRMEMFUNC_FN_TYPE (type0) == TYPE_PTRMEMFUNC_FN_TYPE (type1))) { /* The code we generate for the test is: (op0.index == op1.index && ((op1.index != -1 && op0.delta2 == op1.delta2) || op0.pfn == op1.pfn)) */ tree index0 = build_component_ref (op0, index_identifier, 0, 0); tree index1 = save_expr (build_component_ref (op1, index_identifier, 0, 0)); tree pfn0 = PFN_FROM_PTRMEMFUNC (op0); tree pfn1 = PFN_FROM_PTRMEMFUNC (op1); tree delta20 = DELTA2_FROM_PTRMEMFUNC (op0); tree delta21 = DELTA2_FROM_PTRMEMFUNC (op1); tree e1, e2, e3; tree integer_neg_one_node = build_binary_op (MINUS_EXPR, integer_zero_node, integer_one_node, 1); e1 = build_binary_op (EQ_EXPR, index0, index1, 1); e2 = build_binary_op (NE_EXPR, index1, integer_neg_one_node, 1); e2 = build_binary_op (TRUTH_ANDIF_EXPR, e2, build_binary_op (EQ_EXPR, delta20, delta21, 1), 1); e3 = build_binary_op (EQ_EXPR, pfn0, pfn1, 1); e2 = build_binary_op (TRUTH_ORIF_EXPR, e2, e3, 1); e2 = build_binary_op (TRUTH_ANDIF_EXPR, e1, e2, 1); if (code == EQ_EXPR) return e2; return build_binary_op (EQ_EXPR, e2, integer_zero_node, 1); } else if (TYPE_PTRMEMFUNC_P (type0) && TYPE_PTRMEMFUNC_FN_TYPE (type0) == type1) { tree index0 = build_component_ref (op0, index_identifier, 0, 0); tree index1; tree pfn0 = PFN_FROM_PTRMEMFUNC (op0); tree delta20 = DELTA2_FROM_PTRMEMFUNC (op0); tree delta21 = integer_zero_node; tree e1, e2, e3; tree integer_neg_one_node = build_binary_op (MINUS_EXPR, integer_zero_node, integer_one_node, 1); if (TREE_CODE (TREE_OPERAND (op1, 0)) == FUNCTION_DECL && DECL_VINDEX (TREE_OPERAND (op1, 0))) { /* Map everything down one to make room for the null pointer to member. */ index1 = size_binop (PLUS_EXPR, DECL_VINDEX (TREE_OPERAND (op1, 0)), integer_one_node); op1 = integer_zero_node; delta21 = CLASSTYPE_VFIELD (TYPE_METHOD_BASETYPE (TREE_TYPE (type1))); delta21 = DECL_FIELD_BITPOS (delta21); delta21 = size_binop (FLOOR_DIV_EXPR, delta21, size_int (BITS_PER_UNIT)); } else index1 = integer_neg_one_node; { tree nop1 = build1 (NOP_EXPR, TYPE_PTRMEMFUNC_FN_TYPE (type0), op1); TREE_CONSTANT (nop1) = TREE_CONSTANT (op1); op1 = nop1; } e1 = build_binary_op (EQ_EXPR, index0, index1, 1); e2 = build_binary_op (NE_EXPR, index1, integer_neg_one_node, 1); e2 = build_binary_op (TRUTH_ANDIF_EXPR, e2, build_binary_op (EQ_EXPR, delta20, delta21, 1), 1); e3 = build_binary_op (EQ_EXPR, pfn0, op1, 1); e2 = build_binary_op (TRUTH_ORIF_EXPR, e2, e3, 1); e2 = build_binary_op (TRUTH_ANDIF_EXPR, e1, e2, 1); if (code == EQ_EXPR) return e2; return build_binary_op (EQ_EXPR, e2, integer_zero_node, 1); } else if (TYPE_PTRMEMFUNC_P (type1) && TYPE_PTRMEMFUNC_FN_TYPE (type1) == type0) { return build_binary_op (code, op1, op0, 1); } break; case MAX_EXPR: case MIN_EXPR: if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) shorten = 1; else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) { if (comp_target_types (type0, type1, 1)) result_type = common_type (type0, type1); else { cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast", type0, type1); result_type = ptr_type_node; } } break; case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR: build_type = boolean_type_node; if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) short_compare = 1; else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) { if (comp_target_types (type0, type1, 1)) result_type = common_type (type0, type1); else { cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast", type0, type1); result_type = ptr_type_node; } } else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST && integer_zerop (op1)) result_type = type0; else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST && integer_zerop (op0)) result_type = type1; else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) { result_type = type0; if (pedantic) pedwarn ("ANSI C++ forbids comparison between pointer and integer"); else if (! flag_traditional) warning ("comparison between pointer and integer"); } else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) { result_type = type1; if (pedantic) pedwarn ("ANSI C++ forbids comparison between pointer and integer"); else if (! flag_traditional) warning ("comparison between pointer and integer"); } break; } if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) { if (shorten || common || short_compare) result_type = common_type (type0, type1); /* For certain operations (which identify themselves by shorten != 0) if both args were extended from the same smaller type, do the arithmetic in that type and then extend. shorten !=0 and !=1 indicates a bitwise operation. For them, this optimization is safe only if both args are zero-extended or both are sign-extended. Otherwise, we might change the result. Eg, (short)-1 | (unsigned short)-1 is (int)-1 but calculated in (unsigned short) it would be (unsigned short)-1. */ if (shorten) { int unsigned0, unsigned1; tree arg0 = get_narrower (op0, &unsigned0); tree arg1 = get_narrower (op1, &unsigned1); /* UNS is 1 if the operation to be done is an unsigned one. */ int uns = TREE_UNSIGNED (result_type); tree type; final_type = result_type; /* Handle the case that OP0 does not *contain* a conversion but it *requires* conversion to FINAL_TYPE. */ if (op0 == arg0 && TREE_TYPE (op0) != final_type) unsigned0 = TREE_UNSIGNED (TREE_TYPE (op0)); if (op1 == arg1 && TREE_TYPE (op1) != final_type) unsigned1 = TREE_UNSIGNED (TREE_TYPE (op1)); /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */ /* For bitwise operations, signedness of nominal type does not matter. Consider only how operands were extended. */ if (shorten == -1) uns = unsigned0; /* Note that in all three cases below we refrain from optimizing an unsigned operation on sign-extended args. That would not be valid. */ /* Both args variable: if both extended in same way from same width, do it in that width. Do it unsigned if args were zero-extended. */ if ((TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type)) && (TYPE_PRECISION (TREE_TYPE (arg1)) == TYPE_PRECISION (TREE_TYPE (arg0))) && unsigned0 == unsigned1 && (unsigned0 || !uns)) result_type = signed_or_unsigned_type (unsigned0, common_type (TREE_TYPE (arg0), TREE_TYPE (arg1))); else if (TREE_CODE (arg0) == INTEGER_CST && (unsigned1 || !uns) && (TYPE_PRECISION (TREE_TYPE (arg1)) < TYPE_PRECISION (result_type)) && (type = signed_or_unsigned_type (unsigned1, TREE_TYPE (arg1)), int_fits_type_p (arg0, type))) result_type = type; else if (TREE_CODE (arg1) == INTEGER_CST && (unsigned0 || !uns) && (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type)) && (type = signed_or_unsigned_type (unsigned0, TREE_TYPE (arg0)), int_fits_type_p (arg1, type))) result_type = type; } /* Shifts can be shortened if shifting right. */ if (short_shift) { int unsigned_arg; tree arg0 = get_narrower (op0, &unsigned_arg); final_type = result_type; if (arg0 == op0 && final_type == TREE_TYPE (op0)) unsigned_arg = TREE_UNSIGNED (TREE_TYPE (op0)); if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type) /* We can shorten only if the shift count is less than the number of bits in the smaller type size. */ && TREE_INT_CST_HIGH (op1) == 0 && TYPE_PRECISION (TREE_TYPE (arg0)) > TREE_INT_CST_LOW (op1) /* If arg is sign-extended and then unsigned-shifted, we can simulate this with a signed shift in arg's type only if the extended result is at least twice as wide as the arg. Otherwise, the shift could use up all the ones made by sign-extension and bring in zeros. We can't optimize that case at all, but in most machines it never happens because available widths are 2**N. */ && (!TREE_UNSIGNED (final_type) || unsigned_arg || ((unsigned) 2 * TYPE_PRECISION (TREE_TYPE (arg0)) <= TYPE_PRECISION (result_type)))) { /* Do an unsigned shift if the operand was zero-extended. */ result_type = signed_or_unsigned_type (unsigned_arg, TREE_TYPE (arg0)); /* Convert value-to-be-shifted to that type. */ if (TREE_TYPE (op0) != result_type) op0 = convert (result_type, op0); converted = 1; } } /* Comparison operations are shortened too but differently. They identify themselves by setting short_compare = 1. */ if (short_compare) { /* Don't write &op0, etc., because that would prevent op0 from being kept in a register. Instead, make copies of the our local variables and pass the copies by reference, then copy them back afterward. */ tree xop0 = op0, xop1 = op1, xresult_type = result_type; enum tree_code xresultcode = resultcode; tree val = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode); if (val != 0) return convert (boolean_type_node, val); op0 = xop0, op1 = xop1; converted = 1; resultcode = xresultcode; } if (short_compare && extra_warnings) { int op0_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op0)); int op1_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op1)); int unsignedp0, unsignedp1; tree primop0 = get_narrower (op0, &unsignedp0); tree primop1 = get_narrower (op1, &unsignedp1); /* Give warnings for comparisons between signed and unsigned quantities that may fail. */ /* Do the checking based on the original operand trees, so that casts will be considered, but default promotions won't be. */ /* Do not warn if the comparison is being done in a signed type, since the signed type will only be chosen if it can represent all the values of the unsigned type. */ if (! TREE_UNSIGNED (result_type)) /* OK */; /* Do not warn if both operands are unsigned. */ else if (op0_signed == op1_signed) /* OK */; /* Do not warn if the signed quantity is an unsuffixed integer literal (or some static constant expression involving such literals) and it is non-negative. */ else if ((op0_signed && TREE_CODE (orig_op0) == INTEGER_CST && tree_int_cst_sgn (orig_op0) >= 0) || (op1_signed && TREE_CODE (orig_op1) == INTEGER_CST && tree_int_cst_sgn (orig_op1) >= 0)) /* OK */; /* Do not warn if the comparison is an equality operation, the unsigned quantity is an integral constant and it does not use the most significant bit of result_type. */ else if ((resultcode == EQ_EXPR || resultcode == NE_EXPR) && ((op0_signed && TREE_CODE (orig_op1) == INTEGER_CST && int_fits_type_p (orig_op1, signed_type (result_type)) || (op1_signed && TREE_CODE (orig_op0) == INTEGER_CST && int_fits_type_p (orig_op0, signed_type (result_type)))))) /* OK */; else warning ("comparison between signed and unsigned"); /* Warn if two unsigned values are being compared in a size larger than their original size, and one (and only one) is the result of a `~' operator. This comparison will always fail. Also warn if one operand is a constant, and the constant does not have all bits set that are set in the ~ operand when it is extended. */ if (TREE_CODE (primop0) == BIT_NOT_EXPR ^ TREE_CODE (primop1) == BIT_NOT_EXPR) { if (TREE_CODE (primop0) == BIT_NOT_EXPR) primop0 = get_narrower (TREE_OPERAND (op0, 0), &unsignedp0); if (TREE_CODE (primop1) == BIT_NOT_EXPR) primop1 = get_narrower (TREE_OPERAND (op1, 0), &unsignedp1); if (TREE_CODE (primop0) == INTEGER_CST || TREE_CODE (primop1) == INTEGER_CST) { tree primop; HOST_WIDE_INT constant, mask; int unsignedp; unsigned bits; if (TREE_CODE (primop0) == INTEGER_CST) { primop = primop1; unsignedp = unsignedp1; constant = TREE_INT_CST_LOW (primop0); } else { primop = primop0; unsignedp = unsignedp0; constant = TREE_INT_CST_LOW (primop1); } bits = TYPE_PRECISION (TREE_TYPE (primop)); if (bits < TYPE_PRECISION (result_type) && bits < HOST_BITS_PER_LONG && unsignedp) { mask = (~ (HOST_WIDE_INT) 0) << bits; if ((mask & constant) != mask) warning ("comparison of promoted ~unsigned with constant"); } } else if (unsignedp0 && unsignedp1 && (TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (result_type)) && (TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (result_type))) warning ("comparison of promoted ~unsigned with unsigned"); } } } /* At this point, RESULT_TYPE must be nonzero to avoid an error message. If CONVERTED is zero, both args will be converted to type RESULT_TYPE. Then the expression will be built. It will be given type FINAL_TYPE if that is nonzero; otherwise, it will be given type RESULT_TYPE. */ if (!result_type) { cp_error ("invalid operands `%T' and `%T' to binary `%O'", TREE_TYPE (orig_op0), TREE_TYPE (orig_op1), error_code); return error_mark_node; } if (! converted) { if (TREE_TYPE (op0) != result_type) op0 = convert (result_type, op0); if (TREE_TYPE (op1) != result_type) op1 = convert (result_type, op1); } if (build_type == NULL_TREE) build_type = result_type; { register tree result = build (resultcode, build_type, op0, op1); register tree folded; folded = fold (result); if (folded == result) TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); if (final_type != 0) return convert (final_type, folded); return folded; } } /* Return a tree for the sum or difference (RESULTCODE says which) of pointer PTROP and integer INTOP. */ static tree pointer_int_sum (resultcode, ptrop, intop) enum tree_code resultcode; register tree ptrop, intop; { tree size_exp; register tree result; register tree folded = fold (intop); /* The result is a pointer of the same type that is being added. */ register tree result_type = TREE_TYPE (ptrop); if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE) { if (pedantic || warn_pointer_arith) pedwarn ("ANSI C++ forbids using pointer of type `void *' in arithmetic"); size_exp = integer_one_node; } else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE) { if (pedantic || warn_pointer_arith) pedwarn ("ANSI C++ forbids using pointer to a function in arithmetic"); size_exp = integer_one_node; } else if (TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE) { if (pedantic || warn_pointer_arith) pedwarn ("ANSI C++ forbids using pointer to a method in arithmetic"); size_exp = integer_one_node; } else if (TREE_CODE (TREE_TYPE (result_type)) == OFFSET_TYPE) { if (pedantic) pedwarn ("ANSI C++ forbids using pointer to a member in arithmetic"); size_exp = integer_one_node; } else size_exp = size_in_bytes (TREE_TYPE (result_type)); /* Needed to make OOPS V2R3 work. */ intop = folded; if (TREE_CODE (intop) == INTEGER_CST && TREE_INT_CST_LOW (intop) == 0 && TREE_INT_CST_HIGH (intop) == 0) return ptrop; /* If what we are about to multiply by the size of the elements contains a constant term, apply distributive law and multiply that constant term separately. This helps produce common subexpressions. */ if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR) && ! TREE_CONSTANT (intop) && TREE_CONSTANT (TREE_OPERAND (intop, 1)) && TREE_CONSTANT (size_exp)) { enum tree_code subcode = resultcode; if (TREE_CODE (intop) == MINUS_EXPR) subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR); ptrop = build_binary_op (subcode, ptrop, TREE_OPERAND (intop, 1), 1); intop = TREE_OPERAND (intop, 0); } /* Convert the integer argument to a type the same size as a pointer so the multiply won't overflow spuriously. */ if (TYPE_PRECISION (TREE_TYPE (intop)) != POINTER_SIZE) intop = convert (type_for_size (POINTER_SIZE, 0), intop); /* Replace the integer argument with a suitable product by the object size. Do this multiplication as signed, then convert to the appropriate pointer type (actually unsigned integral). */ intop = convert (result_type, build_binary_op (MULT_EXPR, intop, convert (TREE_TYPE (intop), size_exp), 1)); /* Create the sum or difference. */ result = build (resultcode, result_type, ptrop, intop); folded = fold (result); if (folded == result) TREE_CONSTANT (folded) = TREE_CONSTANT (ptrop) & TREE_CONSTANT (intop); return folded; } /* Return a tree for the difference of pointers OP0 and OP1. The resulting tree has type int. */ static tree pointer_diff (op0, op1) register tree op0, op1; { register tree result, folded; tree restype = ptrdiff_type_node; tree target_type = TREE_TYPE (TREE_TYPE (op0)); if (pedantic) { if (TREE_CODE (target_type) == VOID_TYPE) pedwarn ("ANSI C++ forbids using pointer of type `void *' in subtraction"); if (TREE_CODE (target_type) == FUNCTION_TYPE) pedwarn ("ANSI C++ forbids using pointer to a function in subtraction"); if (TREE_CODE (target_type) == METHOD_TYPE) pedwarn ("ANSI C++ forbids using pointer to a method in subtraction"); if (TREE_CODE (target_type) == OFFSET_TYPE) pedwarn ("ANSI C++ forbids using pointer to a member in subtraction"); } /* First do the subtraction as integers; then drop through to build the divide operator. */ op0 = build_binary_op (MINUS_EXPR, convert (restype, op0), convert (restype, op1), 1); /* This generates an error if op1 is a pointer to an incomplete type. */ if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (op1))) == 0) error ("arithmetic on pointer to an incomplete type"); op1 = ((TREE_CODE (target_type) == VOID_TYPE || TREE_CODE (target_type) == FUNCTION_TYPE || TREE_CODE (target_type) == METHOD_TYPE || TREE_CODE (target_type) == OFFSET_TYPE) ? integer_one_node : size_in_bytes (target_type)); /* Do the division. */ result = build (EXACT_DIV_EXPR, restype, op0, convert (restype, op1)); folded = fold (result); if (folded == result) TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); return folded; } /* Handle the case of taking the address of a COMPONENT_REF. Called by `build_unary_op' and `build_up_reference'. ARG is the COMPONENT_REF whose address we want. ARGTYPE is the pointer type that this address should have. MSG is an error message to print if this COMPONENT_REF is not addressable (such as a bitfield). */ tree build_component_addr (arg, argtype, msg) tree arg, argtype; char *msg; { tree field = TREE_OPERAND (arg, 1); tree basetype = decl_type_context (field); tree rval = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), 0); if (DECL_BIT_FIELD (field)) { error (msg, IDENTIFIER_POINTER (DECL_NAME (field))); return error_mark_node; } if (flag_gc) cp_warning ("address of `%T::%D' taken", basetype, field); if (TREE_CODE (field) == FIELD_DECL && TYPE_USES_COMPLEX_INHERITANCE (basetype)) { /* Can't convert directly to ARGTYPE, since that may have the same pointer type as one of our baseclasses. */ rval = build1 (NOP_EXPR, argtype, convert_pointer_to (basetype, rval)); TREE_CONSTANT (rval) = TREE_CONSTANT (TREE_OPERAND (rval, 0)); } else /* This conversion is harmless. */ rval = convert_force (argtype, rval, 0); if (! integer_zerop (DECL_FIELD_BITPOS (field))) { tree offset = size_binop (EASY_DIV_EXPR, DECL_FIELD_BITPOS (field), size_int (BITS_PER_UNIT)); int flag = TREE_CONSTANT (rval); rval = fold (build (PLUS_EXPR, argtype, rval, convert (argtype, offset))); TREE_CONSTANT (rval) = flag; } return rval; } /* Construct and perhaps optimize a tree representation for a unary operation. CODE, a tree_code, specifies the operation and XARG is the operand. */ tree build_x_unary_op (code, xarg) enum tree_code code; tree xarg; { /* & rec, on incomplete RECORD_TYPEs is the simple opr &, not an error message. */ if (code == ADDR_EXPR && ((IS_AGGR_TYPE_CODE (TREE_CODE (TREE_TYPE (xarg))) && TYPE_SIZE (TREE_TYPE (xarg)) == NULL_TREE) || (TREE_CODE (xarg) == OFFSET_REF))) /* don't look for a function */; else { tree rval = build_opfncall (code, LOOKUP_SPECULATIVELY, xarg, NULL_TREE, NULL_TREE); if (rval) return build_opfncall (code, LOOKUP_NORMAL, xarg, NULL_TREE, NULL_TREE); } return build_unary_op (code, xarg, 0); } /* Just like truthvalue_conversion, but we want a CLEANUP_POINT_EXPR. */ tree condition_conversion (expr) tree expr; { tree t = convert (boolean_type_node, expr); t = fold (build1 (CLEANUP_POINT_EXPR, boolean_type_node, t)); return t; } /* C++: Must handle pointers to members. Perhaps type instantiation should be extended to handle conversion from aggregates to types we don't yet know we want? (Or are those cases typically errors which should be reported?) NOCONVERT nonzero suppresses the default promotions (such as from short to int). */ tree build_unary_op (code, xarg, noconvert) enum tree_code code; tree xarg; int noconvert; { /* No default_conversion here. It causes trouble for ADDR_EXPR. */ register tree arg = xarg; register tree argtype = 0; char *errstring = NULL; tree val; if (arg == error_mark_node) return error_mark_node; switch (code) { case CONVERT_EXPR: /* This is used for unary plus, because a CONVERT_EXPR is enough to prevent anybody from looking inside for associativity, but won't generate any code. */ if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_ENUM | WANT_POINTER, arg, 1))) errstring = "wrong type argument to unary plus"; else { if (!noconvert) arg = default_conversion (arg); arg = build1 (NON_LVALUE_EXPR, TREE_TYPE (arg), arg); } break; case NEGATE_EXPR: if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, arg, 1))) errstring = "wrong type argument to unary minus"; else if (!noconvert) arg = default_conversion (arg); break; case BIT_NOT_EXPR: if (!(arg = build_expr_type_conversion (WANT_INT | WANT_ENUM, arg, 1))) errstring = "wrong type argument to bit-complement"; else if (!noconvert) arg = default_conversion (arg); break; case ABS_EXPR: if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, arg, 1))) errstring = "wrong type argument to abs"; else if (!noconvert) arg = default_conversion (arg); break; case TRUTH_NOT_EXPR: arg = convert (boolean_type_node, arg); val = invert_truthvalue (arg); if (arg != error_mark_node) return val; errstring = "in argument to unary !"; break; case NOP_EXPR: break; case PREINCREMENT_EXPR: case POSTINCREMENT_EXPR: case PREDECREMENT_EXPR: case POSTDECREMENT_EXPR: /* Handle complex lvalues (when permitted) by reduction to simpler cases. */ val = unary_complex_lvalue (code, arg); if (val != 0) return val; /* Report invalid types. */ if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_POINTER, arg, 1))) { if (code == PREINCREMENT_EXPR) errstring ="no pre-increment operator for type"; else if (code == POSTINCREMENT_EXPR) errstring ="no post-increment operator for type"; else if (code == PREDECREMENT_EXPR) errstring ="no pre-decrement operator for type"; else errstring ="no post-decrement operator for type"; break; } /* Report something read-only. */ if (TYPE_READONLY (TREE_TYPE (arg)) || TREE_READONLY (arg)) readonly_error (arg, ((code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) ? "increment" : "decrement"), 0); { register tree inc; tree result_type = TREE_TYPE (arg); arg = get_unwidened (arg, 0); argtype = TREE_TYPE (arg); /* ARM $5.2.5 last annotation says this should be forbidden. */ if (TREE_CODE (argtype) == ENUMERAL_TYPE) pedwarn ("ANSI C++ forbids %sing an enum", (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) ? "increment" : "decrement"); /* Compute the increment. */ if (TREE_CODE (argtype) == POINTER_TYPE) { enum tree_code tmp = TREE_CODE (TREE_TYPE (argtype)); if (TYPE_SIZE (TREE_TYPE (argtype)) == 0) cp_error ("cannot %s a pointer to incomplete type `%T'", ((code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) ? "increment" : "decrement"), TREE_TYPE (argtype)); else if (tmp == FUNCTION_TYPE || tmp == METHOD_TYPE || tmp == VOID_TYPE || tmp == OFFSET_TYPE) cp_pedwarn ("ANSI C++ forbids %sing a pointer of type `%T'", ((code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) ? "increment" : "decrement"), argtype); inc = c_sizeof_nowarn (TREE_TYPE (argtype)); } else inc = integer_one_node; inc = convert (argtype, inc); /* Handle incrementing a cast-expression. */ switch (TREE_CODE (arg)) { case NOP_EXPR: case CONVERT_EXPR: case FLOAT_EXPR: case FIX_TRUNC_EXPR: case FIX_FLOOR_EXPR: case FIX_ROUND_EXPR: case FIX_CEIL_EXPR: { tree incremented, modify, value; if (! lvalue_p (arg) && pedantic) pedwarn ("cast to non-reference type used as lvalue"); arg = stabilize_reference (arg); if (code == PREINCREMENT_EXPR || code == PREDECREMENT_EXPR) value = arg; else value = save_expr (arg); incremented = build (((code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) ? PLUS_EXPR : MINUS_EXPR), argtype, value, inc); TREE_SIDE_EFFECTS (incremented) = 1; modify = build_modify_expr (arg, NOP_EXPR, incremented); return build (COMPOUND_EXPR, TREE_TYPE (arg), modify, value); } } /* Complain about anything else that is not a true lvalue. */ if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) ? "increment" : "decrement"))) return error_mark_node; /* Forbid using -- on `bool'. */ if (TREE_TYPE (arg) == boolean_type_node) { if (code == POSTDECREMENT_EXPR || code == PREDECREMENT_EXPR) { cp_error ("invalid use of `--' on bool variable `%D'", arg); return error_mark_node; } #if 0 /* This will only work if someone can convince Kenner to accept my patch to expand_increment. (jason) */ val = build (code, TREE_TYPE (arg), arg, inc); #else if (code == POSTINCREMENT_EXPR) { arg = stabilize_reference (arg); val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, boolean_true_node); TREE_SIDE_EFFECTS (val) = 1; arg = save_expr (arg); val = build (COMPOUND_EXPR, TREE_TYPE (arg), val, arg); val = build (COMPOUND_EXPR, TREE_TYPE (arg), arg, val); } else val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, boolean_true_node); #endif } else val = build (code, TREE_TYPE (arg), arg, inc); TREE_SIDE_EFFECTS (val) = 1; return convert (result_type, val); } case ADDR_EXPR: /* Note that this operation never does default_conversion regardless of NOCONVERT. */ argtype = TREE_TYPE (arg); if (TREE_CODE (argtype) == REFERENCE_TYPE) { arg = build1 (CONVERT_EXPR, build_pointer_type (TREE_TYPE (TREE_TYPE (arg))), arg); TREE_REFERENCE_EXPR (arg) = 1; return arg; } else if (pedantic && TREE_CODE (arg) == FUNCTION_DECL && DECL_NAME (arg) && DECL_CONTEXT (arg) == NULL_TREE && IDENTIFIER_LENGTH (DECL_NAME (arg)) == 4 && IDENTIFIER_POINTER (DECL_NAME (arg))[0] == 'm' && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (arg)), "main")) /* ARM $3.4 */ pedwarn ("taking address of function `main'"); /* Let &* cancel out to simplify resulting code. */ if (TREE_CODE (arg) == INDIRECT_REF) { /* We don't need to have `current_class_decl' wrapped in a NON_LVALUE_EXPR node. */ if (arg == C_C_D) return current_class_decl; /* Keep `default_conversion' from converting if ARG is of REFERENCE_TYPE. */ arg = TREE_OPERAND (arg, 0); if (TREE_CODE (TREE_TYPE (arg)) == REFERENCE_TYPE) { if (TREE_CODE (arg) == VAR_DECL && DECL_INITIAL (arg) && !TREE_SIDE_EFFECTS (DECL_INITIAL (arg))) arg = DECL_INITIAL (arg); arg = build1 (CONVERT_EXPR, build_pointer_type (TREE_TYPE (TREE_TYPE (arg))), arg); TREE_REFERENCE_EXPR (arg) = 1; TREE_CONSTANT (arg) = TREE_CONSTANT (TREE_OPERAND (arg, 0)); } else if (lvalue_p (arg)) /* Don't let this be an lvalue. */ return non_lvalue (arg); return arg; } /* For &x[y], return x+y */ if (TREE_CODE (arg) == ARRAY_REF) { if (mark_addressable (TREE_OPERAND (arg, 0)) == 0) return error_mark_node; return build_binary_op (PLUS_EXPR, TREE_OPERAND (arg, 0), TREE_OPERAND (arg, 1), 1); } /* Uninstantiated types are all functions. Taking the address of a function is a no-op, so just return the argument. */ if (TREE_CODE (arg) == IDENTIFIER_NODE && IDENTIFIER_OPNAME_P (arg)) { my_friendly_abort (117); /* We don't know the type yet, so just work around the problem. We know that this will resolve to an lvalue. */ return build1 (ADDR_EXPR, unknown_type_node, arg); } if (TREE_CODE (arg) == TREE_LIST) { if (TREE_CODE (TREE_VALUE (arg)) == FUNCTION_DECL && DECL_CHAIN (TREE_VALUE (arg)) == NULL_TREE) /* Unique overloaded non-member function. */ return build_unary_op (ADDR_EXPR, TREE_VALUE (arg), 0); if (TREE_CHAIN (arg) == NULL_TREE && TREE_CODE (TREE_VALUE (arg)) == TREE_LIST && DECL_CHAIN (TREE_VALUE (TREE_VALUE (arg))) == NULL_TREE) /* Unique overloaded member function. */ return build_unary_op (ADDR_EXPR, TREE_VALUE (TREE_VALUE (arg)), 0); return build1 (ADDR_EXPR, unknown_type_node, arg); } /* Handle complex lvalues (when permitted) by reduction to simpler cases. */ val = unary_complex_lvalue (code, arg); if (val != 0) return val; switch (TREE_CODE (arg)) { case NOP_EXPR: case CONVERT_EXPR: case FLOAT_EXPR: case FIX_TRUNC_EXPR: case FIX_FLOOR_EXPR: case FIX_ROUND_EXPR: case FIX_CEIL_EXPR: if (! lvalue_p (arg) && pedantic) pedwarn ("taking the address of a cast to non-reference type"); } /* Allow the address of a constructor if all the elements are constant. */ if (TREE_CODE (arg) == CONSTRUCTOR && TREE_CONSTANT (arg)) ; /* Anything not already handled and not a true memory reference is an error. */ else if (TREE_CODE (argtype) != FUNCTION_TYPE && TREE_CODE (argtype) != METHOD_TYPE && !lvalue_or_else (arg, "unary `&'")) return error_mark_node; /* Ordinary case; arg is a COMPONENT_REF or a decl. */ /* If the lvalue is const or volatile, merge that into the type that the address will point to. */ if (TREE_CODE_CLASS (TREE_CODE (arg)) == 'd' || TREE_CODE_CLASS (TREE_CODE (arg)) == 'r') { if (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg)) argtype = cp_build_type_variant (argtype, TREE_READONLY (arg), TREE_THIS_VOLATILE (arg)); } argtype = build_pointer_type (argtype); if (mark_addressable (arg) == 0) return error_mark_node; { tree addr; if (TREE_CODE (arg) == COMPONENT_REF) addr = build_component_addr (arg, argtype, "attempt to take address of bit-field structure member `%s'"); else addr = build1 (code, argtype, arg); /* Address of a static or external variable or function counts as a constant */ if (staticp (arg)) TREE_CONSTANT (addr) = 1; return addr; } } if (!errstring) { if (argtype == 0) argtype = TREE_TYPE (arg); return fold (build1 (code, argtype, arg)); } error (errstring); return error_mark_node; } /* If CONVERSIONS is a conversion expression or a nested sequence of such, convert ARG with the same conversions in the same order and return the result. */ static tree convert_sequence (conversions, arg) tree conversions; tree arg; { switch (TREE_CODE (conversions)) { case NOP_EXPR: case CONVERT_EXPR: case FLOAT_EXPR: case FIX_TRUNC_EXPR: case FIX_FLOOR_EXPR: case FIX_ROUND_EXPR: case FIX_CEIL_EXPR: return convert (TREE_TYPE (conversions), convert_sequence (TREE_OPERAND (conversions, 0), arg)); default: return arg; } } /* Apply unary lvalue-demanding operator CODE to the expression ARG for certain kinds of expressions which are not really lvalues but which we can accept as lvalues. If ARG is not a kind of expression we can handle, return zero. */ tree unary_complex_lvalue (code, arg) enum tree_code code; tree arg; { /* Handle (a, b) used as an "lvalue". */ if (TREE_CODE (arg) == COMPOUND_EXPR) { tree real_result = build_unary_op (code, TREE_OPERAND (arg, 1), 0); return build (COMPOUND_EXPR, TREE_TYPE (real_result), TREE_OPERAND (arg, 0), real_result); } /* Handle (a ? b : c) used as an "lvalue". */ if (TREE_CODE (arg) == COND_EXPR) return rationalize_conditional_expr (code, arg); if (TREE_CODE (arg) == MODIFY_EXPR || TREE_CODE (arg) == PREINCREMENT_EXPR || TREE_CODE (arg) == PREDECREMENT_EXPR) return unary_complex_lvalue (code, build (COMPOUND_EXPR, TREE_TYPE (TREE_OPERAND (arg, 0)), arg, TREE_OPERAND (arg, 0))); if (code != ADDR_EXPR) return 0; /* Handle (a = b) used as an "lvalue" for `&'. */ if (TREE_CODE (arg) == MODIFY_EXPR || TREE_CODE (arg) == INIT_EXPR) { tree real_result = build_unary_op (code, TREE_OPERAND (arg, 0), 0); return build (COMPOUND_EXPR, TREE_TYPE (real_result), arg, real_result); } if (TREE_CODE (arg) == WITH_CLEANUP_EXPR) { tree real_result = build_unary_op (code, TREE_OPERAND (arg, 0), 0); real_result = build (WITH_CLEANUP_EXPR, TREE_TYPE (real_result), real_result, 0, TREE_OPERAND (arg, 2)); return real_result; } if (TREE_CODE (TREE_TYPE (arg)) == FUNCTION_TYPE || TREE_CODE (TREE_TYPE (arg)) == METHOD_TYPE || TREE_CODE (TREE_TYPE (arg)) == OFFSET_TYPE) { /* The representation of something of type OFFSET_TYPE is really the representation of a pointer to it. Here give the representation its true type. */ tree t; tree offset; my_friendly_assert (TREE_CODE (arg) != SCOPE_REF, 313); if (TREE_CODE (arg) != OFFSET_REF) return 0; t = TREE_OPERAND (arg, 1); if (TREE_CODE (t) == FUNCTION_DECL) /* Check all this code for right semantics. */ return build_unary_op (ADDR_EXPR, t, 0); if (TREE_CODE (t) == VAR_DECL) return build_unary_op (ADDR_EXPR, t, 0); else { if (TREE_OPERAND (arg, 0) && (TREE_CODE (TREE_OPERAND (arg, 0)) != NOP_EXPR || TREE_OPERAND (TREE_OPERAND (arg, 0), 0) != error_mark_node)) if (TREE_CODE (t) != FIELD_DECL) { /* Don't know if this should return address to just _DECL, or actual address resolved in this expression. */ sorry ("address of bound pointer-to-member expression"); return error_mark_node; } offset = get_delta_difference (DECL_FIELD_CONTEXT (t), TREE_TYPE (TREE_OPERAND (arg, 0)), 0); offset = size_binop (PLUS_EXPR, offset, size_binop (EASY_DIV_EXPR, DECL_FIELD_BITPOS (t), size_int (BITS_PER_UNIT))); return convert (build_pointer_type (TREE_TYPE (arg)), offset); } } if (TREE_CODE (arg) == OFFSET_REF) { tree left = TREE_OPERAND (arg, 0), left_addr; tree right_addr = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 1), 0); if (left == 0) if (current_class_decl) left_addr = current_class_decl; else { error ("no `this' for pointer to member"); return error_mark_node; } else left_addr = build_unary_op (ADDR_EXPR, left, 0); return build (PLUS_EXPR, build_pointer_type (TREE_TYPE (arg)), build1 (NOP_EXPR, integer_type_node, left_addr), build1 (NOP_EXPR, integer_type_node, right_addr)); } /* We permit compiler to make function calls returning objects of aggregate type look like lvalues. */ { tree targ = arg; if (TREE_CODE (targ) == SAVE_EXPR) targ = TREE_OPERAND (targ, 0); if (TREE_CODE (targ) == CALL_EXPR && IS_AGGR_TYPE (TREE_TYPE (targ))) { if (TREE_CODE (arg) == SAVE_EXPR) targ = arg; else targ = build_cplus_new (TREE_TYPE (arg), arg, 1); return build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (arg)), targ); } if (TREE_CODE (arg) == SAVE_EXPR && TREE_CODE (targ) == INDIRECT_REF) return build (SAVE_EXPR, build_pointer_type (TREE_TYPE (arg)), TREE_OPERAND (targ, 0), current_function_decl, NULL); /* We shouldn't wrap WITH_CLEANUP_EXPRs inside of SAVE_EXPRs, but in case we do, here's how to handle it. */ if (TREE_CODE (arg) == SAVE_EXPR && TREE_CODE (targ) == WITH_CLEANUP_EXPR) { #if 0 /* Not really a bug, but something to turn on when testing. */ compiler_error ("WITH_CLEANUP_EXPR wrapped in SAVE_EXPR"); #endif return unary_complex_lvalue (ADDR_EXPR, targ); } } /* Don't let anything else be handled specially. */ return 0; } /* Mark EXP saying that we need to be able to take the address of it; it should not be allocated in a register. Value is 1 if successful. C++: we do not allow `current_class_decl' to be addressable. */ int mark_addressable (exp) tree exp; { register tree x = exp; if (TREE_ADDRESSABLE (x) == 1) return 1; while (1) switch (TREE_CODE (x)) { case ADDR_EXPR: case COMPONENT_REF: case ARRAY_REF: x = TREE_OPERAND (x, 0); break; case PARM_DECL: if (x == current_class_decl) { error ("address of `this' not available"); TREE_ADDRESSABLE (x) = 1; /* so compiler doesn't die later */ put_var_into_stack (x); return 1; } case VAR_DECL: if (TREE_STATIC (x) && TREE_READONLY (x) && DECL_RTL (x) != 0 && ! decl_in_memory_p (x)) { /* We thought this would make a good constant variable, but we were wrong. */ push_obstacks_nochange (); end_temporary_allocation (); TREE_ASM_WRITTEN (x) = 0; DECL_RTL (x) = 0; rest_of_decl_compilation (x, 0, IDENTIFIER_LOCAL_VALUE (x) == 0, 0); TREE_ADDRESSABLE (x) = 1; pop_obstacks (); return 1; } /* Caller should not be trying to mark initialized constant fields addressable. */ my_friendly_assert (DECL_LANG_SPECIFIC (x) == 0 || DECL_IN_AGGR_P (x) == 0 || TREE_STATIC (x) || DECL_EXTERNAL (x), 314); case CONST_DECL: case RESULT_DECL: /* For C++, we don't warn about taking the address of a register variable for CONST_DECLs; ARM p97 explicitly says it's okay. */ put_var_into_stack (x); TREE_ADDRESSABLE (x) = 1; return 1; case FUNCTION_DECL: /* We have to test both conditions here. The first may be non-zero in the case of processing a default function. The second may be non-zero in the case of a template function. */ x = DECL_MAIN_VARIANT (x); if ((DECL_THIS_INLINE (x) || DECL_PENDING_INLINE_INFO (x)) && (DECL_CONTEXT (x) == NULL_TREE || TREE_CODE_CLASS (TREE_CODE (DECL_CONTEXT (x))) != 't' || ! CLASSTYPE_INTERFACE_ONLY (DECL_CONTEXT (x)))) { mark_inline_for_output (x); if (x == current_function_decl) DECL_EXTERNAL (x) = 0; } TREE_ADDRESSABLE (x) = 1; TREE_USED (x) = 1; TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (x)) = 1; if (asm_out_file) assemble_external (x); return 1; default: return 1; } } /* Build and return a conditional expression IFEXP ? OP1 : OP2. */ tree build_x_conditional_expr (ifexp, op1, op2) tree ifexp, op1, op2; { tree rval = NULL_TREE; /* See comments in `build_x_binary_op'. */ if (op1 != 0) rval = build_opfncall (COND_EXPR, LOOKUP_SPECULATIVELY, ifexp, op1, op2); if (rval) return build_opfncall (COND_EXPR, LOOKUP_NORMAL, ifexp, op1, op2); return build_conditional_expr (ifexp, op1, op2); } tree build_conditional_expr (ifexp, op1, op2) tree ifexp, op1, op2; { register tree type1; register tree type2; register enum tree_code code1; register enum tree_code code2; register tree result_type = NULL_TREE; tree orig_op1 = op1, orig_op2 = op2; /* If second operand is omitted, it is the same as the first one; make sure it is calculated only once. */ if (op1 == 0) { if (pedantic) pedwarn ("ANSI C++ forbids omitting the middle term of a ?: expression"); ifexp = op1 = save_expr (ifexp); } ifexp = convert (boolean_type_node, ifexp); if (TREE_CODE (ifexp) == ERROR_MARK) return error_mark_node; op1 = require_instantiated_type (TREE_TYPE (op2), op1, error_mark_node); if (op1 == error_mark_node) return error_mark_node; op2 = require_instantiated_type (TREE_TYPE (op1), op2, error_mark_node); if (op2 == error_mark_node) return error_mark_node; /* C++: REFERENCE_TYPES must be dereferenced. */ type1 = TREE_TYPE (op1); code1 = TREE_CODE (type1); type2 = TREE_TYPE (op2); code2 = TREE_CODE (type2); if (code1 == REFERENCE_TYPE) { op1 = convert_from_reference (op1); type1 = TREE_TYPE (op1); code1 = TREE_CODE (type1); } if (code2 == REFERENCE_TYPE) { op2 = convert_from_reference (op2); type2 = TREE_TYPE (op2); code2 = TREE_CODE (type2); } #if 1 /* Produces wrong result if within sizeof. Sorry. */ /* Don't promote the operands separately if they promote the same way. Return the unpromoted type and let the combined value get promoted if necessary. */ if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2) && code2 != ARRAY_TYPE #if 0 /* For C++, let the enumeral type come through. */ && code2 != ENUMERAL_TYPE #endif && code2 != FUNCTION_TYPE && code2 != METHOD_TYPE) { tree result; if (TREE_CONSTANT (ifexp) && (TREE_CODE (ifexp) == INTEGER_CST || TREE_CODE (ifexp) == ADDR_EXPR)) return (integer_zerop (ifexp) ? op2 : op1); if (TREE_CODE (op1) == CONST_DECL) op1 = DECL_INITIAL (op1); else if (TREE_READONLY_DECL_P (op1)) op1 = decl_constant_value (op1); if (TREE_CODE (op2) == CONST_DECL) op2 = DECL_INITIAL (op2); else if (TREE_READONLY_DECL_P (op2)) op2 = decl_constant_value (op2); if (type1 != type2) type1 = cp_build_type_variant (type1, TREE_READONLY (op1) || TREE_READONLY (op2), TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2)); /* ??? This is a kludge to deal with the fact that we don't sort out integers and enums properly, yet. */ result = fold (build (COND_EXPR, type1, ifexp, op1, op2)); if (TREE_TYPE (result) != type1) result = build1 (NOP_EXPR, type1, result); return result; } #endif /* They don't match; promote them both and then try to reconcile them. But don't permit mismatching enum types. */ if (code1 == ENUMERAL_TYPE) { if (code2 == ENUMERAL_TYPE) { cp_error ("enumeral mismatch in conditional expression: `%T' vs `%T'", type1, type2); return error_mark_node; } else if (extra_warnings && ! IS_AGGR_TYPE_CODE (code2) && type2 != type_promotes_to (type1)) warning ("enumeral and non-enumeral type in conditional expression"); } else if (extra_warnings && code2 == ENUMERAL_TYPE && ! IS_AGGR_TYPE_CODE (code1) && type1 != type_promotes_to (type2)) warning ("enumeral and non-enumeral type in conditional expression"); if (code1 != VOID_TYPE) { op1 = default_conversion (op1); type1 = TREE_TYPE (op1); if (TYPE_PTRMEMFUNC_P (type1)) type1 = TYPE_PTRMEMFUNC_FN_TYPE (type1); code1 = TREE_CODE (type1); } if (code2 != VOID_TYPE) { op2 = default_conversion (op2); type2 = TREE_TYPE (op2); if (TYPE_PTRMEMFUNC_P (type2)) type2 = TYPE_PTRMEMFUNC_FN_TYPE (type2); code2 = TREE_CODE (type2); } if (code1 == RECORD_TYPE && code2 == RECORD_TYPE && real_lvalue_p (op1) && real_lvalue_p (op2) && comptypes (type1, type2, -1)) { type1 = build_reference_type (type1); type2 = build_reference_type (type2); result_type = common_type (type1, type2); op1 = convert_to_reference (result_type, op1, CONV_IMPLICIT, LOOKUP_NORMAL, NULL_TREE); op2 = convert_to_reference (result_type, op2, CONV_IMPLICIT, LOOKUP_NORMAL, NULL_TREE); } /* Quickly detect the usual case where op1 and op2 have the same type after promotion. */ else if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2)) { if (type1 == type2) result_type = type1; else result_type = cp_build_type_variant (type1, TREE_READONLY (op1) || TREE_READONLY (op2), TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2)); } else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE) && (code2 == INTEGER_TYPE || code2 == REAL_TYPE)) { result_type = common_type (type1, type2); } else if (code1 == VOID_TYPE || code2 == VOID_TYPE) { if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE)) pedwarn ("ANSI C++ forbids conditional expr with only one void side"); result_type = void_type_node; } else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE) { if (comp_target_types (type1, type2, 1)) result_type = common_type (type1, type2); else if (integer_zerop (op1) && TREE_TYPE (type1) == void_type_node && TREE_CODE (orig_op1) != NOP_EXPR) result_type = qualify_type (type2, type1); else if (integer_zerop (op2) && TREE_TYPE (type2) == void_type_node && TREE_CODE (orig_op2) != NOP_EXPR) result_type = qualify_type (type1, type2); else if (TYPE_MAIN_VARIANT (TREE_TYPE (type1)) == void_type_node) { if (pedantic && TREE_CODE (type2) == FUNCTION_TYPE) pedwarn ("ANSI C++ forbids conditional expr between `void *' and function pointer"); result_type = qualify_type (type1, type2); } else if (TYPE_MAIN_VARIANT (TREE_TYPE (type2)) == void_type_node) { if (pedantic && TREE_CODE (type1) == FUNCTION_TYPE) pedwarn ("ANSI C++ forbids conditional expr between `void *' and function pointer"); result_type = qualify_type (type2, type1); } /* C++ */ else if (comptypes (type2, type1, 0)) result_type = type2; else if (IS_AGGR_TYPE (TREE_TYPE (type1)) && IS_AGGR_TYPE (TREE_TYPE (type2)) && (result_type = common_base_type (TREE_TYPE (type1), TREE_TYPE (type2)))) { if (result_type == error_mark_node) { cp_error ("common base type of types `%T' and `%T' is ambiguous", TREE_TYPE (type1), TREE_TYPE (type2)); result_type = ptr_type_node; } else { if (pedantic && result_type != TREE_TYPE (type1) && result_type != TREE_TYPE (type2)) cp_pedwarn ("`%T' and `%T' converted to `%T *' in conditional expression", type1, type2, result_type); result_type = build_pointer_type (result_type); } } else { pedwarn ("pointer type mismatch in conditional expression"); result_type = ptr_type_node; } } else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE) { if (!integer_zerop (op2)) pedwarn ("pointer/integer type mismatch in conditional expression"); else { op2 = null_pointer_node; #if 0 /* Sez who? */ if (pedantic && TREE_CODE (type1) == FUNCTION_TYPE) pedwarn ("ANSI C++ forbids conditional expr between 0 and function pointer"); #endif } result_type = type1; } else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE) { if (!integer_zerop (op1)) pedwarn ("pointer/integer type mismatch in conditional expression"); else { op1 = null_pointer_node; #if 0 /* Sez who? */ if (pedantic && TREE_CODE (type2) == FUNCTION_TYPE) pedwarn ("ANSI C++ forbids conditional expr between 0 and function pointer"); #endif } result_type = type2; } if (!result_type) { /* The match does not look good. If either is an aggregate value, try converting to a scalar type. */ if (code1 == RECORD_TYPE && code2 == RECORD_TYPE) { cp_error ("aggregate mismatch in conditional expression: `%T' vs `%T'", type1, type2); return error_mark_node; } if (code1 == RECORD_TYPE && TYPE_HAS_CONVERSION (type1)) { tree tmp = build_type_conversion (CONVERT_EXPR, type2, op1, 0); if (tmp == NULL_TREE) { cp_error ("aggregate type `%T' could not convert on lhs of `:'", type1); return error_mark_node; } if (tmp == error_mark_node) error ("ambiguous pointer conversion"); result_type = type2; op1 = tmp; } else if (code2 == RECORD_TYPE && TYPE_HAS_CONVERSION (type2)) { tree tmp = build_type_conversion (CONVERT_EXPR, type1, op2, 0); if (tmp == NULL_TREE) { cp_error ("aggregate type `%T' could not convert on rhs of `:'", type2); return error_mark_node; } if (tmp == error_mark_node) error ("ambiguous pointer conversion"); result_type = type1; op2 = tmp; } else if (flag_cond_mismatch) result_type = void_type_node; else { error ("type mismatch in conditional expression"); return error_mark_node; } } if (TREE_CODE (result_type) == POINTER_TYPE && TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE) result_type = build_ptrmemfunc_type (result_type); if (result_type != TREE_TYPE (op1)) op1 = convert_and_check (result_type, op1); if (result_type != TREE_TYPE (op2)) op2 = convert_and_check (result_type, op2); #if 0 /* XXX delete me, I've been here for years. */ if (IS_AGGR_TYPE_CODE (code1)) { result_type = TREE_TYPE (op1); if (TREE_CONSTANT (ifexp)) return (integer_zerop (ifexp) ? op2 : op1); if (TYPE_MODE (result_type) == BLKmode) { register tree tempvar = build_decl (VAR_DECL, NULL_TREE, result_type); register tree xop1 = build_modify_expr (tempvar, NOP_EXPR, op1); register tree xop2 = build_modify_expr (tempvar, NOP_EXPR, op2); register tree result = fold (build (COND_EXPR, result_type, ifexp, xop1, xop2)); layout_decl (tempvar, 0); /* No way to handle variable-sized objects here. I fear that the entire handling of BLKmode conditional exprs needs to be redone. */ my_friendly_assert (TREE_CONSTANT (DECL_SIZE (tempvar)), 315); DECL_RTL (tempvar) = assign_stack_local (DECL_MODE (tempvar), (TREE_INT_CST_LOW (DECL_SIZE (tempvar)) + BITS_PER_UNIT - 1) / BITS_PER_UNIT, 0); TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (ifexp) | TREE_SIDE_EFFECTS (op1) | TREE_SIDE_EFFECTS (op2); return build (COMPOUND_EXPR, result_type, result, tempvar); } } #endif /* 0 */ if (TREE_CONSTANT (ifexp)) return integer_zerop (ifexp) ? op2 : op1; return convert_from_reference (fold (build (COND_EXPR, result_type, ifexp, op1, op2))); } /* Handle overloading of the ',' operator when needed. Otherwise, this function just builds an expression list. */ tree build_x_compound_expr (list) tree list; { tree rest = TREE_CHAIN (list); tree result; if (rest == NULL_TREE) return build_compound_expr (list); result = build_opfncall (COMPOUND_EXPR, LOOKUP_NORMAL, TREE_VALUE (list), TREE_VALUE (rest), NULL_TREE); if (result) return build_x_compound_expr (tree_cons (NULL_TREE, result, TREE_CHAIN (rest))); if (! TREE_SIDE_EFFECTS (TREE_VALUE (list))) { /* the left-hand operand of a comma expression is like an expression statement: we should warn if it doesn't have any side-effects, unless it was explicitly cast to (void). */ if ((extra_warnings || warn_unused) && !(TREE_CODE (TREE_VALUE(list)) == CONVERT_EXPR && TREE_TYPE (TREE_VALUE(list)) == void_type_node)) warning("left-hand operand of comma expression has no effect"); } #if 0 /* this requires a gcc backend patch to export warn_if_unused_value */ else if (warn_unused) warn_if_unused_value (TREE_VALUE(list)); #endif return build_compound_expr (tree_cons (NULL_TREE, TREE_VALUE (list), build_tree_list (NULL_TREE, build_x_compound_expr (rest)))); } /* Given a list of expressions, return a compound expression that performs them all and returns the value of the last of them. */ tree build_compound_expr (list) tree list; { register tree rest; if (TREE_READONLY_DECL_P (TREE_VALUE (list))) TREE_VALUE (list) = decl_constant_value (TREE_VALUE (list)); if (TREE_CHAIN (list) == 0) { /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. Strip such NOP_EXPRs, since LIST is used in non-lvalue context. */ if (TREE_CODE (list) == NOP_EXPR && TREE_TYPE (list) == TREE_TYPE (TREE_OPERAND (list, 0))) list = TREE_OPERAND (list, 0); /* Convert arrays to pointers. */ if (TREE_CODE (TREE_TYPE (TREE_VALUE (list))) == ARRAY_TYPE) return default_conversion (TREE_VALUE (list)); else return TREE_VALUE (list); } rest = build_compound_expr (TREE_CHAIN (list)); /* When pedantic, a compound expression cannot be a constant expression. */ if (! TREE_SIDE_EFFECTS (TREE_VALUE (list)) && ! pedantic) return rest; return build (COMPOUND_EXPR, TREE_TYPE (rest), break_out_cleanups (TREE_VALUE (list)), rest); } #ifdef __GNUC__ __inline #endif int null_ptr_cst_p (t) tree t; { return (TREE_CODE (t) == INTEGER_CST && integer_zerop (t)); } tree build_static_cast (type, expr) tree type, expr; { return build_c_cast (type, expr, 0); } tree build_reinterpret_cast (type, expr) tree type, expr; { tree intype = TREE_TYPE (expr); if (TYPE_PTRMEMFUNC_P (type)) type = TYPE_PTRMEMFUNC_FN_TYPE (type); if (TYPE_PTRMEMFUNC_P (intype)) intype = TYPE_PTRMEMFUNC_FN_TYPE (intype); if (! POINTER_TYPE_P (type) && ! TREE_CODE (type) == INTEGER_TYPE) { cp_error ("reinterpret_cast cannot convert to type `%T'", type); return error_mark_node; } if (! POINTER_TYPE_P (intype) && ! TREE_CODE (intype) == INTEGER_TYPE) { cp_error ("reinterpret_cast cannot convert from type `%T'", type); return error_mark_node; } if (TREE_CODE (type) == INTEGER_TYPE && TREE_CODE (intype) != POINTER_TYPE) { cp_error ("reinterpret_cast cannot convert non-pointer type `%T' to `%T'", intype, type); return error_mark_node; } if (TREE_CODE (intype) == INTEGER_TYPE && TREE_CODE (type) != POINTER_TYPE) { cp_error ("reinterpret_cast cannot convert `%T' to non-pointer type `%T'", intype, type); return error_mark_node; } if (TREE_CODE (type) == POINTER_TYPE && TREE_CODE (intype) == POINTER_TYPE) expr = convert (ptr_type_node, expr); return build_c_cast (type, expr, 0); } tree build_const_cast (type, expr) tree type, expr; { tree intype = TREE_TYPE (expr); tree t1, t2; if (type == error_mark_node || expr == error_mark_node) return error_mark_node; if (TYPE_PTRMEMFUNC_P (type)) type = TYPE_PTRMEMFUNC_FN_TYPE (type); if (TYPE_PTRMEMFUNC_P (intype)) intype = TYPE_PTRMEMFUNC_FN_TYPE (intype); if (! POINTER_TYPE_P (type)) { cp_error ("const_cast cannot convert to non-pointer type `%T'", type); return error_mark_node; } if (TREE_CODE (type) == REFERENCE_TYPE && ! real_lvalue_p (expr)) { cp_error ("const_cast cannot convert rvalue to type `%T'", type); return error_mark_node; } if (TREE_CODE (type) == POINTER_TYPE && TREE_CODE (intype) != POINTER_TYPE) { cp_error ("const_cast cannot convert non-pointer type `%T' to type `%T'", intype, type); return error_mark_node; } if (TREE_CODE (type) == REFERENCE_TYPE) { t1 = TREE_TYPE (type); t2 = intype; } else { t1 = TREE_TYPE (type); t2 = TREE_TYPE (intype); for (; TREE_CODE (t1) == POINTER_TYPE && TREE_CODE (t2) == POINTER_TYPE; t1 = TREE_TYPE (t1), t2 = TREE_TYPE (t2)) ; } if (TREE_CODE (t1) == OFFSET_TYPE && TREE_CODE (t2) == OFFSET_TYPE) { if (TYPE_OFFSET_BASETYPE (t1) != TYPE_OFFSET_BASETYPE (t2)) { cp_error ("const_cast cannot convert between pointers to members of different types `%T' and `%T'", TYPE_OFFSET_BASETYPE (t2), TYPE_OFFSET_BASETYPE (t1)); return error_mark_node; } t1 = TREE_TYPE (t1); t2 = TREE_TYPE (t2); } if (TYPE_MAIN_VARIANT (t1) != TYPE_MAIN_VARIANT (t2)) { cp_error ("const_cast cannot convert unrelated type `%T' to `%T'", t2, t1); return error_mark_node; } return build_c_cast (type, expr, 0); } /* Build an expression representing a cast to type TYPE of expression EXPR. ALLOW_NONCONVERTING is true if we should allow non-converting constructors when doing the cast. */ tree build_c_cast (type, expr, allow_nonconverting) register tree type; tree expr; int allow_nonconverting; { register tree value = expr; if (type == error_mark_node || expr == error_mark_node) return error_mark_node; /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */ if (TREE_CODE (type) != REFERENCE_TYPE && TREE_CODE (value) == NOP_EXPR && TREE_TYPE (value) == TREE_TYPE (TREE_OPERAND (value, 0))) value = TREE_OPERAND (value, 0); if (TREE_TYPE (expr) && TREE_CODE (TREE_TYPE (expr)) == OFFSET_TYPE && TREE_CODE (type) != OFFSET_TYPE) value = resolve_offset_ref (value); if (TREE_CODE (type) == ARRAY_TYPE) { /* Allow casting from T1* to T2[] because Cfront allows it. NIHCL uses it. It is not valid ANSI C however, and hence, not valid ANSI C++. */ if (TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE) { if (pedantic) pedwarn ("ANSI C++ forbids casting to an array type"); type = build_pointer_type (TREE_TYPE (type)); } else { error ("ANSI C++ forbids casting to an array type"); return error_mark_node; } } if (TREE_CODE (type) == FUNCTION_TYPE || TREE_CODE (type) == METHOD_TYPE) { cp_error ("casting to function type `%T'", type); return error_mark_node; } if (IS_SIGNATURE (type)) { error ("cast specifies signature type"); return error_mark_node; } /* If there's only one function in the overloaded space, just take it. */ if (TREE_CODE (value) == TREE_LIST && TREE_CHAIN (value) == NULL_TREE) value = TREE_VALUE (value); if (TREE_CODE (type) == VOID_TYPE) value = build1 (CONVERT_EXPR, type, value); else if (TREE_TYPE (value) == NULL_TREE || type_unknown_p (value)) { value = instantiate_type (type, value, 1); /* Did we lose? */ if (value == error_mark_node) return error_mark_node; } else { tree otype; int flag; /* Convert functions and arrays to pointers and convert references to their expanded types, but don't convert any other types. */ if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE || TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE || TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE || TREE_CODE (TREE_TYPE (value)) == REFERENCE_TYPE) value = default_conversion (value); otype = TREE_TYPE (value); /* Optionally warn about potentially worrisome casts. */ if (warn_cast_qual && TREE_CODE (type) == POINTER_TYPE && TREE_CODE (otype) == POINTER_TYPE) { /* For C++ we make these regular warnings, rather than softening them into pedwarns. */ if (TYPE_VOLATILE (TREE_TYPE (otype)) && ! TYPE_VOLATILE (TREE_TYPE (type))) warning ("cast discards `volatile' from pointer target type"); if (TYPE_READONLY (TREE_TYPE (otype)) && ! TYPE_READONLY (TREE_TYPE (type))) warning ("cast discards `const' from pointer target type"); } /* Warn about possible alignment problems. */ if (STRICT_ALIGNMENT && warn_cast_align && TREE_CODE (type) == POINTER_TYPE && TREE_CODE (otype) == POINTER_TYPE && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype))) warning ("cast increases required alignment of target type"); #if 0 if (TREE_CODE (type) == INTEGER_TYPE && TREE_CODE (otype) == POINTER_TYPE && TYPE_PRECISION (type) != TYPE_PRECISION (otype)) warning ("cast from pointer to integer of different size"); if (TREE_CODE (type) == POINTER_TYPE && TREE_CODE (otype) == INTEGER_TYPE && TYPE_PRECISION (type) != TYPE_PRECISION (otype) /* Don't warn about converting 0 to pointer, provided the 0 was explicit--not cast or made by folding. */ && !(TREE_CODE (value) == INTEGER_CST && integer_zerop (value))) warning ("cast to pointer from integer of different size"); #endif flag = allow_nonconverting ? CONV_NONCONVERTING : 0; if (TREE_CODE (type) == REFERENCE_TYPE) value = (convert_from_reference (convert_to_reference (type, value, CONV_OLD_CONVERT|flag, LOOKUP_COMPLAIN, NULL_TREE))); else { tree ovalue; if (TREE_READONLY_DECL_P (value)) value = decl_constant_value (value); ovalue = value; value = convert_force (type, value, flag); /* Ignore any integer overflow caused by the cast. */ if (TREE_CODE (value) == INTEGER_CST) { TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue); TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue); } } } /* Always produce some operator for an explicit cast, so we can tell (for -pedantic) that the cast is no lvalue. Also, pedantically, don't let (void *) (FOO *) 0 be a null pointer constant. */ if (TREE_CODE (type) != REFERENCE_TYPE && (value == expr || (pedantic && TREE_CODE (value) == INTEGER_CST && TREE_CODE (expr) == INTEGER_CST && TREE_CODE (TREE_TYPE (expr)) != INTEGER_TYPE))) value = non_lvalue (value); return value; } #if 0 /* Build an assignment expression of lvalue LHS from value RHS. In C++, if the left hand side of the assignment is a REFERENCE_TYPE, that reference becomes deferenced down to it base type. */ /* Return a reference to the BASE_INDEX part of EXPR. TYPE is the type to which BASE_INDEX applies. */ static tree get_base_ref (type, base_index, expr) tree type; int base_index; tree expr; { tree binfos = TYPE_BINFO_BASETYPES (type); tree base_binfo = TREE_VEC_ELT (binfos, base_index); tree ref; if (TREE_CODE (expr) == ARRAY_REF || ! BINFO_OFFSET_ZEROP (base_binfo) || TREE_VIA_VIRTUAL (base_binfo) || TYPE_MODE (type) != TYPE_MODE (BINFO_TYPE (base_binfo))) { tree addr = build_unary_op (ADDR_EXPR, expr, 0); ref = build_indirect_ref (convert_pointer_to (base_binfo, addr), NULL_PTR); } else { ref = copy_node (expr); TREE_TYPE (ref) = BINFO_TYPE (base_binfo); } return ref; } /* Build an assignment expression of lvalue LHS from value RHS. MODIFYCODE is the code for a binary operator that we use to combine the old value of LHS with RHS to get the new value. Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. C++: If MODIFYCODE is INIT_EXPR, then leave references unbashed. `build_modify_expr_1' implements recursive part of memberwise assignment operation. */ static tree build_modify_expr_1 (lhs, modifycode, rhs, basetype_path) tree lhs, rhs; enum tree_code modifycode; tree basetype_path; { register tree result; tree newrhs = rhs; tree lhstype = TREE_TYPE (lhs); tree olhstype = lhstype; /* Avoid duplicate error messages from operands that had errors. */ if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK) return error_mark_node; /* If a binary op has been requested, combine the old LHS value with the RHS producing the value we should actually store into the LHS. */ if (modifycode == INIT_EXPR) ; else if (modifycode == NOP_EXPR) { /* must deal with overloading of `operator=' here. */ if (TREE_CODE (lhstype) == REFERENCE_TYPE) lhstype = TREE_TYPE (lhstype); else lhstype = olhstype; } else { lhs = stabilize_reference (lhs); newrhs = build_binary_op (modifycode, lhs, rhs, 1); modifycode = NOP_EXPR; } /* If storing into a structure or union member, it has probably been given type `int'. Compute the type that would go with the actual amount of storage the member occupies. */ if (TREE_CODE (lhs) == COMPONENT_REF && (TREE_CODE (lhstype) == INTEGER_TYPE || TREE_CODE (lhstype) == REAL_TYPE || TREE_CODE (lhstype) == ENUMERAL_TYPE)) lhstype = TREE_TYPE (get_unwidened (lhs, 0)); /* C++: The semantics of C++ differ from those of C when an assignment of an aggregate is desired. Assignment in C++ is now defined as memberwise assignment of non-static members and base class objects. This rule applies recursively until a member of a built-in type is found. Also, we cannot do a bit-wise copy of aggregates which contain virtual function table pointers. Those pointer values must be preserved through the copy. However, this is handled in expand_expr, and not here. This is because much better code can be generated at that stage than this one. */ if (TREE_CODE (lhstype) == RECORD_TYPE && TYPE_LANG_SPECIFIC (lhstype) && TYPE_MAIN_VARIANT (lhstype) == TYPE_MAIN_VARIANT (TREE_TYPE (newrhs))) { register tree elt; int i; /* Perform operation on object. */ if (modifycode == INIT_EXPR && TYPE_HAS_INIT_REF (lhstype)) { result = build_method_call (lhs, constructor_name_full (lhstype), build_tree_list (NULL_TREE, rhs), basetype_path, LOOKUP_NORMAL); return build_indirect_ref (result, NULL_PTR); } else if (modifycode == NOP_EXPR) { /* `operator=' is not an inheritable operator; see 13.4.3. */ if (TYPE_LANG_SPECIFIC (lhstype) && TYPE_HAS_ASSIGNMENT (lhstype)) { result = build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, lhs, rhs, make_node (NOP_EXPR)); if (result == NULL_TREE) return error_mark_node; return result; } } if (TYPE_USES_VIRTUAL_BASECLASSES (lhstype) || (modifycode == NOP_EXPR && TYPE_GETS_ASSIGNMENT (lhstype)) || (modifycode == INIT_EXPR && TYPE_GETS_INIT_REF (lhstype))) { tree binfos = BINFO_BASETYPES (TYPE_BINFO (lhstype)); result = NULL_TREE; if (binfos != NULL_TREE) /* Perform operation on each member, depth-first, left-right. */ for (i = 0; i <= TREE_VEC_LENGTH (binfos)-1; i++) { tree base_binfo = TREE_VEC_ELT (binfos, i); tree base_lhs, base_rhs; tree new_result; /* Assignments from virtual baseclasses handled elsewhere. */ if (TREE_VIA_VIRTUAL (base_binfo)) continue; base_lhs = get_base_ref (lhstype, i, lhs); base_rhs = get_base_ref (lhstype, i, newrhs); BINFO_INHERITANCE_CHAIN (base_binfo) = basetype_path; new_result = build_modify_expr_1 (base_lhs, modifycode, base_rhs, base_binfo); /* We either get back a compound stmt, or a simple one. */ if (new_result && TREE_CODE (new_result) == TREE_LIST) new_result = build_compound_expr (new_result); result = tree_cons (NULL_TREE, new_result, result); } for (elt = TYPE_FIELDS (lhstype); elt; elt = TREE_CHAIN (elt)) { tree vbases = NULL_TREE; tree elt_lhs, elt_rhs; if (TREE_CODE (elt) != FIELD_DECL) continue; if (DECL_NAME (elt) && (VFIELD_NAME_P (DECL_NAME (elt)) || VBASE_NAME_P (DECL_NAME (elt)))) continue; if (TREE_READONLY (elt) || TREE_CODE (TREE_TYPE (elt)) == REFERENCE_TYPE) { cp_error ("cannot generate default `%T::operator ='", lhstype); if (TREE_CODE (TREE_TYPE (elt)) == REFERENCE_TYPE) cp_error_at ("because member `%#D' is a reference", elt); else cp_error_at ("because member `%#D' is const", elt); return error_mark_node; } if (IS_AGGR_TYPE (TREE_TYPE (elt)) && TYPE_LANG_SPECIFIC (TREE_TYPE (elt))) vbases = CLASSTYPE_VBASECLASSES (TREE_TYPE (elt)); elt_lhs = build (COMPONENT_REF, TREE_TYPE (elt), lhs, elt); elt_rhs = build (COMPONENT_REF, TREE_TYPE (elt), newrhs, elt); /* It is not always safe to go through `build_modify_expr_1' when performing element-wise copying. This is because an element may be of ARRAY_TYPE, which will not be properly copied as a naked element. */ if (TREE_CODE (TREE_TYPE (elt)) == RECORD_TYPE && TYPE_LANG_SPECIFIC (TREE_TYPE (elt))) basetype_path = TYPE_BINFO (TREE_TYPE (elt)); while (vbases) { tree elt_lhs_addr = build_unary_op (ADDR_EXPR, elt_lhs, 0); tree elt_rhs_addr = build_unary_op (ADDR_EXPR, elt_rhs, 0); elt_lhs_addr = convert_pointer_to (vbases, elt_lhs_addr); elt_rhs_addr = convert_pointer_to (vbases, elt_rhs_addr); result = tree_cons (NULL_TREE, build_modify_expr_1 (build_indirect_ref (elt_lhs_addr, NULL_PTR), modifycode, build_indirect_ref (elt_rhs_addr, NULL_PTR), basetype_path), result); if (TREE_VALUE (result) == error_mark_node) return error_mark_node; vbases = TREE_CHAIN (vbases); } elt_lhs = build_modify_expr_1 (elt_lhs, modifycode, elt_rhs, basetype_path); result = tree_cons (NULL_TREE, elt_lhs, result); } if (result) return build_compound_expr (result); /* No fields to move. */ return integer_zero_node; } else { result = build (modifycode == NOP_EXPR ? MODIFY_EXPR : INIT_EXPR, void_type_node, lhs, rhs); TREE_SIDE_EFFECTS (result) = 1; return result; } } result = build_modify_expr (lhs, modifycode, newrhs); /* ARRAY_TYPEs cannot be converted to anything meaningful, and leaving it there screws up `build_compound_expr' when it tries to defaultly convert everything. */ if (TREE_CODE (TREE_TYPE (result)) == ARRAY_TYPE) TREE_TYPE (result) = void_type_node; return result; } #endif /* Taken from expr.c: Subroutine of expand_expr: record the non-copied parts (LIST) of an expr (LHS), and return a list which specifies the initial values of these parts. */ static tree init_noncopied_parts (lhs, list) tree lhs; tree list; { tree tail; tree parts = 0; for (tail = list; tail; tail = TREE_CHAIN (tail)) if (TREE_CODE (TREE_VALUE (tail)) == TREE_LIST) parts = chainon (parts, init_noncopied_parts (lhs, TREE_VALUE (tail))); else { tree part = TREE_VALUE (tail); tree part_type = TREE_TYPE (part); tree to_be_initialized = build (COMPONENT_REF, part_type, lhs, part); parts = tree_cons (TREE_PURPOSE (tail), to_be_initialized, parts); } return parts; } tree expand_target_expr (t) tree t; { tree xval = make_node (RTL_EXPR); rtx rtxval; do_pending_stack_adjust (); start_sequence_for_rtl_expr (xval); emit_note (0, -1); rtxval = expand_expr (t, NULL, VOIDmode, 0); do_pending_stack_adjust (); TREE_SIDE_EFFECTS (xval) = 1; RTL_EXPR_SEQUENCE (xval) = get_insns (); end_sequence (); RTL_EXPR_RTL (xval) = rtxval; TREE_TYPE (xval) = TREE_TYPE (t); return xval; } /* Build an assignment expression of lvalue LHS from value RHS. MODIFYCODE is the code for a binary operator that we use to combine the old value of LHS with RHS to get the new value. Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. C++: If MODIFYCODE is INIT_EXPR, then leave references unbashed. */ tree build_modify_expr (lhs, modifycode, rhs) tree lhs; enum tree_code modifycode; tree rhs; { register tree result; tree newrhs = rhs; tree lhstype = TREE_TYPE (lhs); tree olhstype = lhstype; tree olhs = lhs; /* Avoid duplicate error messages from operands that had errors. */ if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK) return error_mark_node; /* Types that aren't fully specified cannot be used in assignments. */ lhs = require_complete_type (lhs); /* Decide early if we are going to protect RHS from GC before assigning it to LHS. */ if (type_needs_gc_entry (TREE_TYPE (rhs)) && ! value_safe_from_gc (lhs, rhs)) rhs = protect_value_from_gc (lhs, rhs); newrhs = rhs; /* Handle assignment to signature pointers/refs. */ if (TYPE_LANG_SPECIFIC (lhstype) && (IS_SIGNATURE_POINTER (lhstype) || IS_SIGNATURE_REFERENCE (lhstype))) { return build_signature_pointer_constructor (lhs, rhs); } /* Handle control structure constructs used as "lvalues". */ switch (TREE_CODE (lhs)) { /* Handle --foo = 5; as these are valid constructs in C++ */ case PREDECREMENT_EXPR: case PREINCREMENT_EXPR: if (TREE_SIDE_EFFECTS (TREE_OPERAND (lhs, 0))) lhs = build (TREE_CODE (lhs), TREE_TYPE (lhs), stabilize_reference (TREE_OPERAND (lhs, 0))); return build (COMPOUND_EXPR, lhstype, lhs, build_modify_expr (TREE_OPERAND (lhs, 0), modifycode, rhs)); /* Handle (a, b) used as an "lvalue". */ case COMPOUND_EXPR: newrhs = build_modify_expr (TREE_OPERAND (lhs, 1), modifycode, rhs); if (TREE_CODE (newrhs) == ERROR_MARK) return error_mark_node; return build (COMPOUND_EXPR, lhstype, TREE_OPERAND (lhs, 0), newrhs); case MODIFY_EXPR: newrhs = build_modify_expr (TREE_OPERAND (lhs, 0), modifycode, rhs); if (TREE_CODE (newrhs) == ERROR_MARK) return error_mark_node; return build (COMPOUND_EXPR, lhstype, lhs, newrhs); /* Handle (a ? b : c) used as an "lvalue". */ case COND_EXPR: rhs = save_expr (rhs); { /* Produce (a ? (b = rhs) : (c = rhs)) except that the RHS goes through a save-expr so the code to compute it is only emitted once. */ tree cond = build_conditional_expr (TREE_OPERAND (lhs, 0), build_modify_expr (convert (TREE_TYPE (lhs), TREE_OPERAND (lhs, 1)), modifycode, rhs), build_modify_expr (convert (TREE_TYPE (lhs), TREE_OPERAND (lhs, 2)), modifycode, rhs)); if (TREE_CODE (cond) == ERROR_MARK) return cond; /* Make sure the code to compute the rhs comes out before the split. */ return build (COMPOUND_EXPR, TREE_TYPE (lhs), /* Case to void to suppress warning from warn_if_unused_value. */ convert (void_type_node, rhs), cond); } } if (TREE_CODE (lhs) == OFFSET_REF) { if (TREE_OPERAND (lhs, 0) == NULL_TREE) { /* Static class member? */ tree member = TREE_OPERAND (lhs, 1); if (TREE_CODE (member) == VAR_DECL) lhs = member; else { compiler_error ("invalid static class member"); return error_mark_node; } } else lhs = resolve_offset_ref (lhs); olhstype = lhstype = TREE_TYPE (lhs); } if (TREE_CODE (lhstype) == REFERENCE_TYPE && modifycode != INIT_EXPR) { lhs = convert_from_reference (lhs); olhstype = lhstype = TREE_TYPE (lhs); } /* If a binary op has been requested, combine the old LHS value with the RHS producing the value we should actually store into the LHS. */ if (modifycode == INIT_EXPR) { if (! IS_AGGR_TYPE (lhstype)) /* Do the default thing */; else if (! TYPE_HAS_CONSTRUCTOR (lhstype)) { cp_error ("`%T' has no constructors", lhstype); return error_mark_node; } else if (TYPE_HAS_TRIVIAL_INIT_REF (lhstype) && TYPE_MAIN_VARIANT (lhstype) == TYPE_MAIN_VARIANT (TREE_TYPE (newrhs))) /* Do the default thing */; else { result = build_method_call (lhs, constructor_name_full (lhstype), build_tree_list (NULL_TREE, rhs), NULL_TREE, LOOKUP_NORMAL); if (result == NULL_TREE) return error_mark_node; return result; } } else if (modifycode == NOP_EXPR) { #if 1 /* `operator=' is not an inheritable operator. */ if (! IS_AGGR_TYPE (lhstype)) /* Do the default thing */; else if (! TYPE_HAS_ASSIGNMENT (lhstype)) { cp_error ("`%T' does not define operator=", lhstype); return error_mark_node; } else if (TYPE_HAS_TRIVIAL_ASSIGN_REF (lhstype) && TYPE_MAIN_VARIANT (lhstype) == TYPE_MAIN_VARIANT (TREE_TYPE (newrhs))) { if (warn_synth) /* If we care about this, do overload resolution. */ build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, lhs, rhs, make_node (NOP_EXPR)); /* Do the default thing */; } else { result = build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, lhs, rhs, make_node (NOP_EXPR)); if (result == NULL_TREE) return error_mark_node; return result; } #else /* Treat `operator=' as an inheritable operator. */ if (TYPE_LANG_SPECIFIC (lhstype) && TYPE_GETS_ASSIGNMENT (lhstype)) { tree orig_lhstype = lhstype; while (! TYPE_HAS_ASSIGNMENT (lhstype)) { int i, n_baseclasses = CLASSTYPE_N_BASECLASSES (lhstype); tree basetype = NULL_TREE; for (i = 0; i < n_baseclasses; i++) if (TYPE_GETS_ASSIGNMENT (TYPE_BINFO_BASETYPE (lhstype, i))) { if (basetype != NULL_TREE) { message_2_types (error, "base classes `%s' and `%s' both have operator ='", basetype, TYPE_BINFO_BASETYPE (lhstype, i)); return error_mark_node; } basetype = TYPE_BINFO_BASETYPE (lhstype, i); } lhstype = basetype; } if (orig_lhstype != lhstype) { lhs = build_indirect_ref (convert_pointer_to (lhstype, build_unary_op (ADDR_EXPR, lhs, 0)), NULL_PTR); if (lhs == error_mark_node) { cp_error ("conversion to private basetype `%T'", lhstype); return error_mark_node; } } result = build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, lhs, rhs, make_node (NOP_EXPR)); if (result == NULL_TREE) return error_mark_node; return result; } #endif lhstype = olhstype; } else if (PROMOTES_TO_AGGR_TYPE (lhstype, REFERENCE_TYPE)) { /* This case must convert to some sort of lvalue that can participate in an op= operation. */ tree lhs_tmp = lhs; tree rhs_tmp = rhs; if (build_default_binary_type_conversion (modifycode, &lhs_tmp, &rhs_tmp)) { lhs = stabilize_reference (lhs_tmp); /* Forget is was ever anything else. */ olhstype = lhstype = TREE_TYPE (lhs); newrhs = build_binary_op (modifycode, lhs, rhs_tmp, 1); } else { cp_error ("no match for `%O(%#T, %#T)'", modifycode, TREE_TYPE (lhs), TREE_TYPE (rhs)); return error_mark_node; } } else { lhs = stabilize_reference (lhs); newrhs = build_binary_op (modifycode, lhs, rhs, 1); } /* Handle a cast used as an "lvalue". We have already performed any binary operator using the value as cast. Now convert the result to the cast type of the lhs, and then true type of the lhs and store it there; then convert result back to the cast type to be the value of the assignment. */ switch (TREE_CODE (lhs)) { case NOP_EXPR: case CONVERT_EXPR: case FLOAT_EXPR: case FIX_TRUNC_EXPR: case FIX_FLOOR_EXPR: case FIX_ROUND_EXPR: case FIX_CEIL_EXPR: if (TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE || TREE_CODE (TREE_TYPE (newrhs)) == FUNCTION_TYPE || TREE_CODE (TREE_TYPE (newrhs)) == METHOD_TYPE || TREE_CODE (TREE_TYPE (newrhs)) == OFFSET_TYPE) newrhs = default_conversion (newrhs); { tree inner_lhs = TREE_OPERAND (lhs, 0); tree result; if (! lvalue_p (lhs) && pedantic) pedwarn ("cast to non-reference type used as lvalue"); result = build_modify_expr (inner_lhs, NOP_EXPR, convert (TREE_TYPE (inner_lhs), convert (lhstype, newrhs))); if (TREE_CODE (result) == ERROR_MARK) return result; return convert (TREE_TYPE (lhs), result); } } /* Now we have handled acceptable kinds of LHS that are not truly lvalues. Reject anything strange now. */ if (!lvalue_or_else (lhs, "assignment")) return error_mark_node; GNU_xref_assign (lhs); /* Warn about storing in something that is `const'. */ /* For C++, don't warn if this is initialization. */ if (modifycode != INIT_EXPR /* For assignment to `const' signature pointer/reference fields, don't warn either, we already printed a better message before. */ && ! (TREE_CODE (lhs) == COMPONENT_REF && (IS_SIGNATURE_POINTER (TREE_TYPE (TREE_OPERAND (lhs, 0))) || IS_SIGNATURE_REFERENCE (TREE_TYPE (TREE_OPERAND (lhs, 0))))) && (TREE_READONLY (lhs) || TYPE_READONLY (lhstype) || ((TREE_CODE (lhstype) == RECORD_TYPE || TREE_CODE (lhstype) == UNION_TYPE) && C_TYPE_FIELDS_READONLY (lhstype)) || (TREE_CODE (lhstype) == REFERENCE_TYPE && TYPE_READONLY (TREE_TYPE (lhstype))))) readonly_error (lhs, "assignment", 0); /* If storing into a structure or union member, it has probably been given type `int'. Compute the type that would go with the actual amount of storage the member occupies. */ if (TREE_CODE (lhs) == COMPONENT_REF && (TREE_CODE (lhstype) == INTEGER_TYPE || TREE_CODE (lhstype) == REAL_TYPE || TREE_CODE (lhstype) == ENUMERAL_TYPE)) { lhstype = TREE_TYPE (get_unwidened (lhs, 0)); /* If storing in a field that is in actuality a short or narrower than one, we must store in the field in its actual type. */ if (lhstype != TREE_TYPE (lhs)) { lhs = copy_node (lhs); TREE_TYPE (lhs) = lhstype; } } /* check to see if there is an assignment to `this' */ if (lhs == current_class_decl) { if (flag_this_is_variable > 0 && DECL_NAME (current_function_decl) != NULL_TREE && (DECL_NAME (current_function_decl) != constructor_name (current_class_type))) warning ("assignment to `this' not in constructor or destructor"); current_function_just_assigned_this = 1; } /* The TREE_TYPE of RHS may be TYPE_UNKNOWN. This can happen when the type of RHS is not yet known, i.e. its type is inherited from LHS. */ rhs = require_instantiated_type (lhstype, newrhs, error_mark_node); if (rhs == error_mark_node) return error_mark_node; newrhs = rhs; if (modifycode != INIT_EXPR) { /* Make modifycode now either a NOP_EXPR or an INIT_EXPR. */ modifycode = NOP_EXPR; /* Reference-bashing */ if (TREE_CODE (lhstype) == REFERENCE_TYPE) { tree tmp = convert_from_reference (lhs); lhstype = TREE_TYPE (tmp); if (TYPE_SIZE (lhstype) == 0) { incomplete_type_error (lhs, lhstype); return error_mark_node; } lhs = tmp; olhstype = lhstype; } if (TREE_CODE (TREE_TYPE (newrhs)) == REFERENCE_TYPE) { tree tmp = convert_from_reference (newrhs); if (TYPE_SIZE (TREE_TYPE (tmp)) == 0) { incomplete_type_error (newrhs, TREE_TYPE (tmp)); return error_mark_node; } newrhs = tmp; } } if (TREE_SIDE_EFFECTS (lhs)) lhs = stabilize_reference (lhs); if (TREE_SIDE_EFFECTS (newrhs)) newrhs = stabilize_reference (newrhs); #if 0 /* This is now done by generating X(X&) and operator=(X&). */ /* C++: The semantics of C++ differ from those of C when an assignment of an aggregate is desired. Assignment in C++ is now defined as memberwise assignment of non-static members and base class objects. This rule applies recursively until a member of a built-in type is found. Also, we cannot do a bit-wise copy of aggregates which contain virtual function table pointers. Those pointer values must be preserved through the copy. However, this is handled in expand_expr, and not here. This is because much better code can be generated at that stage than this one. */ if (TREE_CODE (lhstype) == RECORD_TYPE && ! TYPE_PTRMEMFUNC_P (lhstype) && (TYPE_MAIN_VARIANT (lhstype) == TYPE_MAIN_VARIANT (TREE_TYPE (newrhs)) || (TREE_CODE (TREE_TYPE (newrhs)) == RECORD_TYPE && UNIQUELY_DERIVED_FROM_P (lhstype, TREE_TYPE (newrhs))))) { tree vbases = CLASSTYPE_VBASECLASSES (lhstype); tree lhs_addr = build_unary_op (ADDR_EXPR, lhs, 0); tree rhs_addr; /* Memberwise assignment would cause NEWRHS to be evaluated for every member that gets assigned. By wrapping side-effecting exprs in a SAVE_EXPR, NEWRHS will only be evaluated once. */ if (IS_AGGR_TYPE (TREE_TYPE (newrhs)) && TREE_SIDE_EFFECTS (newrhs) /* This are things we don't have to save. */ && TREE_CODE (newrhs) != COND_EXPR && TREE_CODE (newrhs) != TARGET_EXPR && TREE_CODE (newrhs) != WITH_CLEANUP_EXPR) /* Call `break_out_cleanups' on NEWRHS in case there are cleanups. If NEWRHS is a CALL_EXPR that needs a cleanup, failure to do so will result in expand_expr expanding the call without knowing that it should run the cleanup. */ newrhs = save_expr (break_out_cleanups (newrhs)); if (TREE_CODE (newrhs) == COND_EXPR) rhs_addr = rationalize_conditional_expr (ADDR_EXPR, newrhs); else rhs_addr = build_unary_op (ADDR_EXPR, newrhs, 0); result = tree_cons (NULL_TREE, convert (build_reference_type (lhstype), lhs), NULL_TREE); if (! comptypes (TREE_TYPE (lhs_addr), TREE_TYPE (rhs_addr), 1)) rhs_addr = convert_pointer_to (TREE_TYPE (TREE_TYPE (lhs_addr)), rhs_addr); { tree noncopied_parts = NULL_TREE; if (TYPE_NONCOPIED_PARTS (lhstype) != 0) noncopied_parts = init_noncopied_parts (lhs, TYPE_NONCOPIED_PARTS (lhstype)); while (noncopied_parts != 0) { result = tree_cons (NULL_TREE, build_modify_expr (convert (ptr_type_node, TREE_VALUE (noncopied_parts)), NOP_EXPR, TREE_PURPOSE (noncopied_parts)), result); noncopied_parts = TREE_CHAIN (noncopied_parts); } } /* Once we have our hands on an address, we must change NEWRHS to work from there. Otherwise we can get multiple evaluations of NEWRHS. */ if (TREE_CODE (newrhs) != SAVE_EXPR) newrhs = build_indirect_ref (rhs_addr, NULL_PTR); while (vbases) { tree elt_lhs = convert_pointer_to (vbases, lhs_addr); tree elt_rhs = convert_pointer_to (vbases, rhs_addr); result = tree_cons (NULL_TREE, build_modify_expr_1 (build_indirect_ref (elt_lhs, NULL_PTR), modifycode, build_indirect_ref (elt_rhs, NULL_PTR), TYPE_BINFO (lhstype)), result); if (TREE_VALUE (result) == error_mark_node) return error_mark_node; vbases = TREE_CHAIN (vbases); } result = tree_cons (NULL_TREE, build_modify_expr_1 (lhs, modifycode, newrhs, TYPE_BINFO (lhstype)), result); return build_compound_expr (result); } #endif /* Convert new value to destination type. */ if (TREE_CODE (lhstype) == ARRAY_TYPE) { int from_array; if (! comptypes (lhstype, TREE_TYPE (rhs), 0)) { cp_error ("incompatible types in assignment of `%T' to `%T'", TREE_TYPE (rhs), lhstype); return error_mark_node; } /* Allow array assignment in compiler-generated code. */ if (pedantic && ! DECL_ARTIFICIAL (current_function_decl)) pedwarn ("ANSI C++ forbids assignment of arrays"); /* Have to wrap this in RTL_EXPR for two cases: in base or member initialization and if we are a branch of a ?: operator. Since we can't easily know the latter, just do it always. */ result = make_node (RTL_EXPR); TREE_TYPE (result) = void_type_node; do_pending_stack_adjust (); start_sequence_for_rtl_expr (result); /* As a matter of principle, `start_sequence' should do this. */ emit_note (0, -1); from_array = TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE ? 1 + (modifycode != INIT_EXPR): 0; expand_vec_init (lhs, lhs, array_type_nelts (lhstype), newrhs, from_array); do_pending_stack_adjust (); TREE_SIDE_EFFECTS (result) = 1; RTL_EXPR_SEQUENCE (result) = get_insns (); RTL_EXPR_RTL (result) = const0_rtx; end_sequence (); return result; } if (modifycode == INIT_EXPR) { newrhs = convert_for_initialization (lhs, lhstype, newrhs, LOOKUP_NORMAL, "assignment", NULL_TREE, 0); if (lhs == DECL_RESULT (current_function_decl)) { if (DECL_INITIAL (lhs)) warning ("return value from function receives multiple initializations"); DECL_INITIAL (lhs) = newrhs; } } else { #if 0 if (IS_AGGR_TYPE (lhstype)) { if (result = build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, lhs, newrhs, make_node (NOP_EXPR))) return result; } #endif /* Avoid warnings on enum bit fields. */ if (TREE_CODE (olhstype) == ENUMERAL_TYPE && TREE_CODE (lhstype) == INTEGER_TYPE) { newrhs = convert_for_assignment (olhstype, newrhs, "assignment", NULL_TREE, 0); newrhs = convert_force (lhstype, newrhs, 0); } else newrhs = convert_for_assignment (lhstype, newrhs, "assignment", NULL_TREE, 0); if (TREE_CODE (newrhs) == CALL_EXPR && TYPE_NEEDS_CONSTRUCTING (lhstype)) newrhs = build_cplus_new (lhstype, newrhs, 0); /* Can't initialize directly from a TARGET_EXPR, since that would cause the lhs to be constructed twice, and possibly result in accidental self-initialization. So we force the TARGET_EXPR to be expanded. expand_expr should really do this by itself. */ if (TREE_CODE (newrhs) == TARGET_EXPR) newrhs = expand_target_expr (newrhs); } if (TREE_CODE (newrhs) == ERROR_MARK) return error_mark_node; if (TREE_CODE (newrhs) == COND_EXPR) { tree lhs1; tree cond = TREE_OPERAND (newrhs, 0); if (TREE_SIDE_EFFECTS (lhs)) cond = build_compound_expr (tree_cons (NULL_TREE, lhs, build_tree_list (NULL_TREE, cond))); /* Cannot have two identical lhs on this one tree (result) as preexpand calls will rip them out and fill in RTL for them, but when the rtl is generated, the calls will only be in the first side of the condition, not on both, or before the conditional jump! (mrs) */ lhs1 = break_out_calls (lhs); if (lhs == lhs1) /* If there's no change, the COND_EXPR behaves like any other rhs. */ result = build (modifycode == NOP_EXPR ? MODIFY_EXPR : INIT_EXPR, lhstype, lhs, newrhs); else { tree result_type = TREE_TYPE (newrhs); /* We have to convert each arm to the proper type because the types may have been munged by constant folding. */ result = build (COND_EXPR, result_type, cond, build_modify_expr (lhs, modifycode, convert (result_type, TREE_OPERAND (newrhs, 1))), build_modify_expr (lhs1, modifycode, convert (result_type, TREE_OPERAND (newrhs, 2)))); } } else if (modifycode != INIT_EXPR && TREE_CODE (newrhs) == WITH_CLEANUP_EXPR) { tree cleanup = TREE_OPERAND (newrhs, 2); tree slot; /* Finish up by running cleanups and having the "value" of the lhs. */ tree exprlist = tree_cons (NULL_TREE, cleanup, build_tree_list (NULL_TREE, lhs)); newrhs = TREE_OPERAND (newrhs, 0); if (TREE_CODE (newrhs) == TARGET_EXPR) slot = TREE_OPERAND (newrhs, 0); else if (TREE_CODE (newrhs) == ADDR_EXPR) { /* Bad but valid. */ slot = newrhs; warning ("address taken of temporary object"); } else my_friendly_abort (118); /* Copy the value computed in SLOT into LHS. */ exprlist = tree_cons (NULL_TREE, build_modify_expr (lhs, modifycode, slot), exprlist); /* Evaluate the expression that needs CLEANUP. This will compute the value into SLOT. */ exprlist = tree_cons (NULL_TREE, newrhs, exprlist); result = convert (lhstype, build_compound_expr (exprlist)); } else result = build (modifycode == NOP_EXPR ? MODIFY_EXPR : INIT_EXPR, lhstype, lhs, newrhs); TREE_SIDE_EFFECTS (result) = 1; /* If we got the LHS in a different type for storing in, convert the result back to the nominal type of LHS so that the value we return always has the same type as the LHS argument. */ if (olhstype == TREE_TYPE (result)) return result; /* Avoid warnings converting integral types back into enums for enum bit fields. */ if (TREE_CODE (TREE_TYPE (result)) == INTEGER_TYPE && TREE_CODE (olhstype) == ENUMERAL_TYPE) { result = build (COMPOUND_EXPR, olhstype, result, olhs); TREE_NO_UNUSED_WARNING (result) = 1; return result; } return convert_for_assignment (olhstype, result, "assignment", NULL_TREE, 0); } /* Return 0 if EXP is not a valid lvalue in this language even though `lvalue_or_else' would accept it. */ int language_lvalue_valid (exp) tree exp; { return 1; } /* Get difference in deltas for different pointer to member function types. Return integer_zero_node, if FROM cannot be converted to a TO type. If FORCE is true, then allow reverse conversions as well. */ static tree get_delta_difference (from, to, force) tree from, to; int force; { tree delta = integer_zero_node; tree binfo; if (to == from) return delta; /* Should get_base_distance here, so we can check if any thing along the path is virtual, and we need to make sure we stay inside the real binfos when going through virtual bases. Maybe we should replace virtual bases with binfo_member (...CLASSTYPE_VBASECLASSES...)... (mrs) */ binfo = get_binfo (from, to, 1); if (binfo == error_mark_node) { error (" in pointer to member function conversion"); return delta; } if (binfo == 0) { if (!force) { error_not_base_type (from, to); error (" in pointer to member function conversion"); return delta; } binfo = get_binfo (to, from, 1); if (binfo == error_mark_node) { error (" in pointer to member function conversion"); return delta; } if (binfo == 0) { error ("cannot convert pointer to member of type %T to unrelated pointer to member of type %T", from, to); return delta; } if (TREE_VIA_VIRTUAL (binfo)) { warning ("pointer to member conversion to virtual base class will only work if you are very careful"); } return build_binary_op (MINUS_EXPR, integer_zero_node, BINFO_OFFSET (binfo), 1); } if (TREE_VIA_VIRTUAL (binfo)) { warning ("pointer to member conversion from virtual base class will only work if you are very careful"); } return BINFO_OFFSET (binfo); } /* Build a constructor for a pointer to member function. It can be used to initialize global variables, local variable, or used as a value in expressions. TYPE is the POINTER to METHOD_TYPE we want to be. If FORCE is non-zero, then force this conversion, even if we would rather not do it. Usually set when using an explicit cast. Return error_mark_node, if something goes wrong. */ tree build_ptrmemfunc (type, pfn, force) tree type, pfn; int force; { tree index = integer_zero_node; tree delta = integer_zero_node; tree delta2 = integer_zero_node; tree vfield_offset; tree npfn; tree u; /* Handle multiple conversions of pointer to member functions. */ if (TYPE_PTRMEMFUNC_P (TREE_TYPE (pfn))) { tree ndelta, ndelta2, nindex; /* Is is already the right type? */ #if 0 /* Sorry, can't do this, the backend is too stupid. */ if (TYPE_METHOD_BASETYPE (TREE_TYPE (type)) == TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn))))) { if (type != TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn))) { npfn = build1 (NOP_EXPR, TYPE_GET_PTRMEMFUNC_TYPE (type), pfn); TREE_CONSTANT (npfn) = TREE_CONSTANT (pfn); } return pfn; } #else if (type == TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn))) return pfn; #endif if (TREE_CODE (pfn) != CONSTRUCTOR) { tree e1, e2, e3; ndelta = convert (ptrdiff_type_node, build_component_ref (pfn, delta_identifier, 0, 0)); ndelta2 = convert (ptrdiff_type_node, DELTA2_FROM_PTRMEMFUNC (pfn)); index = build_component_ref (pfn, index_identifier, 0, 0); delta = get_delta_difference (TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn)))), TYPE_METHOD_BASETYPE (TREE_TYPE (type)), force); delta = build_binary_op (PLUS_EXPR, delta, ndelta, 1); delta2 = build_binary_op (PLUS_EXPR, ndelta2, delta2, 1); e1 = fold (build (GT_EXPR, boolean_type_node, index, integer_zero_node)); u = build_nt (CONSTRUCTOR, 0, tree_cons (delta2_identifier, delta2, NULL_TREE)); u = build_nt (CONSTRUCTOR, 0, tree_cons (NULL_TREE, delta, tree_cons (NULL_TREE, index, tree_cons (NULL_TREE, u, NULL_TREE)))); e2 = digest_init (TYPE_GET_PTRMEMFUNC_TYPE (type), u, (tree*)0); pfn = PFN_FROM_PTRMEMFUNC (pfn); npfn = build1 (NOP_EXPR, type, pfn); TREE_CONSTANT (npfn) = TREE_CONSTANT (pfn); u = build_nt (CONSTRUCTOR, 0, tree_cons (pfn_identifier, npfn, NULL_TREE)); u = build_nt (CONSTRUCTOR, 0, tree_cons (NULL_TREE, delta, tree_cons (NULL_TREE, index, tree_cons (NULL_TREE, u, NULL_TREE)))); e3 = digest_init (TYPE_GET_PTRMEMFUNC_TYPE (type), u, (tree*)0); return build_conditional_expr (e1, e2, e3); } ndelta = TREE_VALUE (CONSTRUCTOR_ELTS (pfn)); nindex = TREE_VALUE (TREE_CHAIN (CONSTRUCTOR_ELTS (pfn))); npfn = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (CONSTRUCTOR_ELTS (pfn)))); npfn = TREE_VALUE (CONSTRUCTOR_ELTS (npfn)); if (integer_zerop (nindex)) pfn = integer_zero_node; else if (integer_zerop (fold (size_binop (PLUS_EXPR, nindex, integer_one_node)))) { tree e3; delta = get_delta_difference (TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn)))), TYPE_METHOD_BASETYPE (TREE_TYPE (type)), force); delta = build_binary_op (PLUS_EXPR, delta, ndelta, 1); pfn = build1 (NOP_EXPR, type, npfn); TREE_CONSTANT (pfn) = TREE_CONSTANT (npfn); u = build_nt (CONSTRUCTOR, 0, tree_cons (pfn_identifier, pfn, NULL_TREE)); u = build_nt (CONSTRUCTOR, 0, tree_cons (NULL_TREE, delta, tree_cons (NULL_TREE, nindex, tree_cons (NULL_TREE, u, NULL_TREE)))); e3 = digest_init (TYPE_GET_PTRMEMFUNC_TYPE (type), u, (tree*)0); return e3; } else { sorry ("value casting of variable nonnull pointer to member functions not supported"); return error_mark_node; } } /* Handle null pointer to member function conversions. */ if (integer_zerop (pfn)) { pfn = build_c_cast (type, integer_zero_node, 0); u = build_nt (CONSTRUCTOR, 0, tree_cons (pfn_identifier, pfn, NULL_TREE)); u = build_nt (CONSTRUCTOR, 0, tree_cons (NULL_TREE, integer_zero_node, tree_cons (NULL_TREE, integer_zero_node, tree_cons (NULL_TREE, u, NULL_TREE)))); return digest_init (TYPE_GET_PTRMEMFUNC_TYPE (type), u, (tree*)0); } if (TREE_CODE (pfn) == TREE_LIST || (TREE_CODE (pfn) == ADDR_EXPR && TREE_CODE (TREE_OPERAND (pfn, 0)) == TREE_LIST)) { pfn = instantiate_type (type, pfn, 1); if (pfn == error_mark_node) return error_mark_node; if (TREE_CODE (pfn) != ADDR_EXPR) pfn = build_unary_op (ADDR_EXPR, pfn, 0); } /* Allow pointer to member conversions here. */ delta = get_delta_difference (TYPE_METHOD_BASETYPE (TREE_TYPE (TREE_TYPE (pfn))), TYPE_METHOD_BASETYPE (TREE_TYPE (type)), force); delta2 = build_binary_op (PLUS_EXPR, delta2, delta, 1); if (TREE_CODE (TREE_OPERAND (pfn, 0)) != FUNCTION_DECL) warning ("assuming pointer to member function is non-virtual"); if (TREE_CODE (TREE_OPERAND (pfn, 0)) == FUNCTION_DECL && DECL_VINDEX (TREE_OPERAND (pfn, 0))) { /* Find the offset to the vfield pointer in the object. */ vfield_offset = get_binfo (DECL_CONTEXT (TREE_OPERAND (pfn, 0)), DECL_CLASS_CONTEXT (TREE_OPERAND (pfn, 0)), 0); vfield_offset = get_vfield_offset (vfield_offset); delta2 = size_binop (PLUS_EXPR, vfield_offset, delta2); /* Map everything down one to make room for the null pointer to member. */ index = size_binop (PLUS_EXPR, DECL_VINDEX (TREE_OPERAND (pfn, 0)), integer_one_node); u = build_nt (CONSTRUCTOR, 0, tree_cons (delta2_identifier, delta2, NULL_TREE)); } else { index = size_binop (MINUS_EXPR, integer_zero_node, integer_one_node); npfn = build1 (NOP_EXPR, type, pfn); TREE_CONSTANT (npfn) = TREE_CONSTANT (pfn); u = build_nt (CONSTRUCTOR, 0, tree_cons (pfn_identifier, npfn, NULL_TREE)); } u = build_nt (CONSTRUCTOR, 0, tree_cons (NULL_TREE, delta, tree_cons (NULL_TREE, index, tree_cons (NULL_TREE, u, NULL_TREE)))); return digest_init (TYPE_GET_PTRMEMFUNC_TYPE (type), u, (tree*)0); } /* Convert value RHS to type TYPE as preparation for an assignment to an lvalue of type TYPE. The real work of conversion is done by `convert'. The purpose of this function is to generate error messages for assignments that are not allowed in C. ERRTYPE is a string to use in error messages: "assignment", "return", etc. C++: attempts to allow `convert' to find conversions involving implicit type conversion between aggregate and scalar types as per 8.5.6 of C++ manual. Does not randomly dereference pointers to aggregates! */ static tree convert_for_assignment (type, rhs, errtype, fndecl, parmnum) tree type, rhs; char *errtype; tree fndecl; int parmnum; { register enum tree_code codel = TREE_CODE (type); register tree rhstype; register enum tree_code coder = TREE_CODE (TREE_TYPE (rhs)); if (coder == UNKNOWN_TYPE) rhs = instantiate_type (type, rhs, 1); if (coder == ERROR_MARK) return error_mark_node; if (codel == OFFSET_TYPE) { type = TREE_TYPE (type); codel = TREE_CODE (type); } /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ if (TREE_CODE (rhs) == NON_LVALUE_EXPR) rhs = TREE_OPERAND (rhs, 0); if (rhs == error_mark_node) return error_mark_node; if (TREE_VALUE (rhs) == error_mark_node) return error_mark_node; if (TREE_CODE (TREE_TYPE (rhs)) == OFFSET_TYPE) { rhs = resolve_offset_ref (rhs); if (rhs == error_mark_node) return error_mark_node; rhstype = TREE_TYPE (rhs); coder = TREE_CODE (rhstype); } if (TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE || TREE_CODE (TREE_TYPE (rhs)) == METHOD_TYPE) rhs = default_conversion (rhs); else if (TREE_CODE (TREE_TYPE (rhs)) == REFERENCE_TYPE) rhs = convert_from_reference (rhs); rhstype = TREE_TYPE (rhs); coder = TREE_CODE (rhstype); /* This should no longer change types on us. */ if (TREE_CODE (rhs) == CONST_DECL) rhs = DECL_INITIAL (rhs); else if (TREE_READONLY_DECL_P (rhs)) rhs = decl_constant_value (rhs); if (type == rhstype) { overflow_warning (rhs); return rhs; } if (coder == VOID_TYPE) { error ("void value not ignored as it ought to be"); return error_mark_node; } /* Arithmetic types all interconvert. */ if ((codel == INTEGER_TYPE || codel == REAL_TYPE || codel == BOOLEAN_TYPE) && (coder == INTEGER_TYPE || coder == REAL_TYPE || coder == BOOLEAN_TYPE)) { /* But we should warn if assigning REAL_TYPE to INTEGER_TYPE. */ if (coder == REAL_TYPE && codel == INTEGER_TYPE) { if (fndecl) cp_warning ("`%T' used for argument %P of `%D'", rhstype, parmnum, fndecl); else cp_warning ("%s to `%T' from `%T'", errtype, type, rhstype); } /* And we should warn if assigning a negative value to an unsigned variable. */ else if (TREE_UNSIGNED (type) && codel != BOOLEAN_TYPE) { if (TREE_CODE (rhs) == INTEGER_CST && TREE_NEGATED_INT (rhs)) { if (fndecl) cp_warning ("negative value `%E' passed as argument %P of `%D'", rhs, parmnum, fndecl); else cp_warning ("%s of negative value `%E' to `%T'", errtype, rhs, type); } overflow_warning (rhs); if (TREE_CONSTANT (rhs)) rhs = fold (rhs); } return convert_and_check (type, rhs); } /* Conversions involving enums. */ else if ((codel == ENUMERAL_TYPE && (INTEGRAL_CODE_P (coder) || coder == REAL_TYPE)) || (coder == ENUMERAL_TYPE && (INTEGRAL_CODE_P (codel) || codel == REAL_TYPE))) { return cp_convert (type, rhs, CONV_IMPLICIT, LOOKUP_NORMAL); } /* Conversions among pointers */ else if (codel == POINTER_TYPE && (coder == POINTER_TYPE || (coder == RECORD_TYPE && (IS_SIGNATURE_POINTER (rhstype) || IS_SIGNATURE_REFERENCE (rhstype))))) { register tree ttl = TREE_TYPE (type); register tree ttr; int ctt = 0; if (coder == RECORD_TYPE) { rhs = build_optr_ref (rhs); rhstype = TREE_TYPE (rhs); } ttr = TREE_TYPE (rhstype); /* If both pointers are of aggregate type, then we can give better error messages, and save some work as well. */ if (TREE_CODE (ttl) == RECORD_TYPE && TREE_CODE (ttr) == RECORD_TYPE) { tree binfo; if (TYPE_MAIN_VARIANT (ttl) == TYPE_MAIN_VARIANT (ttr) || type == class_star_type_node || rhstype == class_star_type_node) binfo = TYPE_BINFO (ttl); else binfo = get_binfo (ttl, ttr, 1); if (binfo == error_mark_node) return error_mark_node; if (binfo == 0) return error_not_base_type (ttl, ttr); if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr)) { if (fndecl) cp_pedwarn ("passing `%T' as argument %P of `%D' discards const", rhstype, parmnum, fndecl); else cp_pedwarn ("%s to `%T' from `%T' discards const", errtype, type, rhstype); } if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr)) { if (fndecl) cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile", rhstype, parmnum, fndecl); else cp_pedwarn ("%s to `%T' from `%T' discards volatile", errtype, type, rhstype); } } /* Any non-function converts to a [const][volatile] void * and vice versa; otherwise, targets must be the same. Meanwhile, the lhs target must have all the qualifiers of the rhs. */ else if (TYPE_MAIN_VARIANT (ttl) == void_type_node || TYPE_MAIN_VARIANT (ttr) == void_type_node || (ctt = comp_target_types (type, rhstype, 1)) || (unsigned_type (TYPE_MAIN_VARIANT (ttl)) == unsigned_type (TYPE_MAIN_VARIANT (ttr)))) { /* ARM $4.8, commentary on p39. */ if (TYPE_MAIN_VARIANT (ttl) == void_type_node && TREE_CODE (ttr) == OFFSET_TYPE) { cp_error ("no standard conversion from `%T' to `void *'", ttr); return error_mark_node; } if (ctt < 0) cp_pedwarn ("converting `%T' to `%T' is a contravariance violation", rhstype, type); if (TYPE_MAIN_VARIANT (ttl) != void_type_node && TYPE_MAIN_VARIANT (ttr) == void_type_node && rhs != null_pointer_node) { if (coder == RECORD_TYPE) cp_pedwarn ("implicit conversion of signature pointer to type `%T'", type); else pedwarn ("ANSI C++ forbids implicit conversion from `void *' in %s", errtype); } /* Const and volatile mean something different for function types, so the usual warnings are not appropriate. */ else if ((TREE_CODE (ttr) != FUNCTION_TYPE && TREE_CODE (ttr) != METHOD_TYPE) || (TREE_CODE (ttl) != FUNCTION_TYPE && TREE_CODE (ttl) != METHOD_TYPE)) { if (TREE_CODE (ttl) == OFFSET_TYPE && binfo_member (TYPE_OFFSET_BASETYPE (ttr), CLASSTYPE_VBASECLASSES (TYPE_OFFSET_BASETYPE (ttl)))) { sorry ("%s between pointer to members converting across virtual baseclasses", errtype); return error_mark_node; } else if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr)) { if (fndecl) cp_pedwarn ("passing `%T' as argument %P of `%D' discards const", rhstype, parmnum, fndecl); else cp_pedwarn ("%s to `%T' from `%T' discards const", errtype, type, rhstype); } else if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr)) { if (fndecl) cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile", rhstype, parmnum, fndecl); else cp_pedwarn ("%s to `%T' from `%T' discards volatile", errtype, type, rhstype); } else if (TREE_CODE (ttl) == TREE_CODE (ttr) && ! comp_target_types (type, rhstype, 1)) { if (fndecl) cp_pedwarn ("passing `%T' as argument %P of `%D' changes signedness", rhstype, parmnum, fndecl); else cp_pedwarn ("%s to `%T' from `%T' changes signedness", errtype, type, rhstype); } } } else if (TREE_CODE (ttr) == OFFSET_TYPE && TREE_CODE (ttl) != OFFSET_TYPE) { /* Normally, pointers to different type codes (other than void) are not compatible, but we perform some type instantiation if that resolves the ambiguity of (X Y::*) and (X *). */ if (current_class_decl) { if (TREE_CODE (rhs) == INTEGER_CST) { rhs = build (PLUS_EXPR, build_pointer_type (TREE_TYPE (ttr)), current_class_decl, rhs); return convert_for_assignment (type, rhs, errtype, fndecl, parmnum); } } if (TREE_CODE (ttl) == METHOD_TYPE) error ("%s between pointer-to-method and pointer-to-member types", errtype); else error ("%s between pointer and pointer-to-member types", errtype); return error_mark_node; } else { int add_quals = 0, const_parity = 0, volatile_parity = 0; int left_const = 1; int unsigned_parity; int nptrs = 0; /* This code is basically a duplicate of comp_ptr_ttypes_real. */ for (; ; ttl = TREE_TYPE (ttl), ttr = TREE_TYPE (ttr)) { nptrs -= 1; const_parity |= TYPE_READONLY (ttl) < TYPE_READONLY (ttr); volatile_parity |= TYPE_VOLATILE (ttl) < TYPE_VOLATILE (ttr); if (! left_const && (TYPE_READONLY (ttl) > TYPE_READONLY (ttr) || TYPE_VOLATILE (ttl) > TYPE_VOLATILE (ttr))) add_quals = 1; left_const &= TYPE_READONLY (ttl); if (TREE_CODE (ttl) != POINTER_TYPE || TREE_CODE (ttr) != POINTER_TYPE) break; } unsigned_parity = TREE_UNSIGNED (ttl) - TREE_UNSIGNED (ttr); if (unsigned_parity) { if (TREE_UNSIGNED (ttl)) ttr = unsigned_type (ttr); else ttl = unsigned_type (ttl); } if (comp_target_types (ttl, ttr, nptrs) > 0) { if (add_quals) { if (fndecl) cp_pedwarn ("passing `%T' as argument %P of `%D' adds cv-quals without intervening `const'", rhstype, parmnum, fndecl); else cp_pedwarn ("%s to `%T' from `%T' adds cv-quals without intervening `const'", errtype, type, rhstype); } if (const_parity) { if (fndecl) cp_pedwarn ("passing `%T' as argument %P of `%D' discards const", rhstype, parmnum, fndecl); else cp_pedwarn ("%s to `%T' from `%T' discards const", errtype, type, rhstype); } if (volatile_parity) { if (fndecl) cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile", rhstype, parmnum, fndecl); else cp_pedwarn ("%s to `%T' from `%T' discards volatile", errtype, type, rhstype); } if (unsigned_parity > 0) { if (fndecl) cp_pedwarn ("passing `%T' as argument %P of `%D' changes signed to unsigned", rhstype, parmnum, fndecl); else cp_pedwarn ("%s to `%T' from `%T' changes signed to unsigned", errtype, type, rhstype); } else if (unsigned_parity < 0) { if (fndecl) cp_pedwarn ("passing `%T' as argument %P of `%D' changes unsigned to signed", rhstype, parmnum, fndecl); else cp_pedwarn ("%s to `%T' from `%T' changes unsigned to signed", errtype, type, rhstype); } /* C++ is not so friendly about converting function and member function pointers as C. Emit warnings here. */ if (TREE_CODE (ttl) == FUNCTION_TYPE || TREE_CODE (ttl) == METHOD_TYPE) if (! comptypes (ttl, ttr, 0)) { warning ("conflicting function types in %s:", errtype); cp_warning ("\t`%T' != `%T'", type, rhstype); } } else if (TREE_CODE (TREE_TYPE (rhs)) == METHOD_TYPE) { /* When does this happen? */ my_friendly_abort (119); /* Conversion of a pointer-to-member type to void *. */ rhs = build_unary_op (ADDR_EXPR, rhs, 0); TREE_TYPE (rhs) = type; return rhs; } else if (TREE_CODE (TREE_TYPE (rhs)) == OFFSET_TYPE) { /* When does this happen? */ my_friendly_abort (120); /* Conversion of a pointer-to-member type to void *. */ rhs = build_unary_op (ADDR_EXPR, rhs, 0); TREE_TYPE (rhs) = type; return rhs; } else { if (fndecl) cp_error ("passing `%T' as argument %P of `%D'", rhstype, parmnum, fndecl); else cp_error ("%s to `%T' from `%T'", errtype, type, rhstype); return error_mark_node; } } return convert (type, rhs); } else if (codel == POINTER_TYPE && coder == INTEGER_TYPE) { /* An explicit constant 0 can convert to a pointer, but not a 0 that results from casting or folding. */ if (! (TREE_CODE (rhs) == INTEGER_CST && integer_zerop (rhs))) { if (fndecl) cp_pedwarn ("passing `%T' to argument %P of `%D' lacks a cast", rhstype, parmnum, fndecl); else cp_pedwarn ("%s to `%T' from `%T' lacks a cast", errtype, type, rhstype); return convert (type, rhs); } return null_pointer_node; } else if (codel == INTEGER_TYPE && (coder == POINTER_TYPE || (coder == RECORD_TYPE && (IS_SIGNATURE_POINTER (rhstype) || TYPE_PTRMEMFUNC_FLAG (rhstype) || IS_SIGNATURE_REFERENCE (rhstype))))) { if (fndecl) cp_pedwarn ("passing `%T' to argument %P of `%D' lacks a cast", rhstype, parmnum, fndecl); else cp_pedwarn ("%s to `%T' from `%T' lacks a cast", errtype, type, rhstype); return convert (type, rhs); } else if (codel == BOOLEAN_TYPE && (coder == POINTER_TYPE || (coder == RECORD_TYPE && (IS_SIGNATURE_POINTER (rhstype) || TYPE_PTRMEMFUNC_FLAG (rhstype) || IS_SIGNATURE_REFERENCE (rhstype))))) return convert (type, rhs); /* C++ */ else if (((coder == POINTER_TYPE && TREE_CODE (TREE_TYPE (rhstype)) == METHOD_TYPE) || integer_zerop (rhs) || TYPE_PTRMEMFUNC_P (rhstype)) && TYPE_PTRMEMFUNC_P (type)) { tree ttl = TYPE_PTRMEMFUNC_FN_TYPE (type); tree ttr = (TREE_CODE (rhstype) == POINTER_TYPE ? rhstype : TYPE_PTRMEMFUNC_FN_TYPE (type)); int ctt = comp_target_types (ttl, ttr, 1); if (ctt < 0) cp_pedwarn ("converting `%T' to `%T' is a contravariance violation", ttr, ttl); else if (ctt == 0) cp_error ("%s to `%T' from `%T'", errtype, ttl, ttr); /* compatible pointer to member functions. */ return build_ptrmemfunc (ttl, rhs, 0); } else if (codel == ERROR_MARK || coder == ERROR_MARK) return error_mark_node; /* This should no longer happen. References are initialized via `convert_for_initialization'. They should otherwise be bashed before coming here. */ else if (codel == REFERENCE_TYPE) my_friendly_abort (317); else if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (rhs))) { tree nrhs = build1 (NOP_EXPR, type, rhs); TREE_CONSTANT (nrhs) = TREE_CONSTANT (rhs); return nrhs; } else if (TYPE_HAS_CONSTRUCTOR (type) || IS_AGGR_TYPE (TREE_TYPE (rhs))) return convert (type, rhs); cp_error ("%s to `%T' from `%T'", errtype, type, rhstype); return error_mark_node; } /* Convert RHS to be of type TYPE. If EXP is non-zero, it is the target of the initialization. ERRTYPE is a string to use in error messages. Two major differences between the behavior of `convert_for_assignment' and `convert_for_initialization' are that references are bashed in the former, while copied in the latter, and aggregates are assigned in the former (operator=) while initialized in the latter (X(X&)). If using constructor make sure no conversion operator exists, if one does exist, an ambiguity exists. If flags doesn't include LOOKUP_COMPLAIN, don't complain about anything. */ tree convert_for_initialization (exp, type, rhs, flags, errtype, fndecl, parmnum) tree exp, type, rhs; int flags; char *errtype; tree fndecl; int parmnum; { register enum tree_code codel = TREE_CODE (type); register tree rhstype; register enum tree_code coder; /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. Strip such NOP_EXPRs, since RHS is used in non-lvalue context. */ if (TREE_CODE (rhs) == NOP_EXPR && TREE_TYPE (rhs) == TREE_TYPE (TREE_OPERAND (rhs, 0)) && codel != REFERENCE_TYPE) rhs = TREE_OPERAND (rhs, 0); if (rhs == error_mark_node || (TREE_CODE (rhs) == TREE_LIST && TREE_VALUE (rhs) == error_mark_node)) return error_mark_node; if (TREE_CODE (TREE_TYPE (rhs)) == OFFSET_TYPE) { rhs = resolve_offset_ref (rhs); if (rhs == error_mark_node) return error_mark_node; } if (TREE_CODE (TREE_TYPE (rhs)) == REFERENCE_TYPE) rhs = convert_from_reference (rhs); if ((TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE && TREE_CODE (type) != ARRAY_TYPE && (TREE_CODE (type) != REFERENCE_TYPE || TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE)) || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE || TREE_CODE (TREE_TYPE (rhs)) == METHOD_TYPE) rhs = default_conversion (rhs); rhstype = TREE_TYPE (rhs); coder = TREE_CODE (rhstype); if (coder == UNKNOWN_TYPE) { rhs = instantiate_type (type, rhs, 1); rhstype = TREE_TYPE (rhs); coder = TREE_CODE (rhstype); } if (coder == ERROR_MARK) return error_mark_node; #if 0 /* This is *not* the quick way out! It is the way to disaster. */ if (type == rhstype) goto converted; #endif /* We accept references to incomplete types, so we can return here before checking if RHS is of complete type. */ if (codel == REFERENCE_TYPE) { /* This should eventually happen in convert_arguments. */ extern int warningcount, errorcount; int savew, savee; if (fndecl) savew = warningcount, savee = errorcount; rhs = convert_to_reference (type, rhs, CONV_IMPLICIT, flags, exp ? exp : error_mark_node); if (fndecl) { if (warningcount > savew) cp_warning_at ("in passing argument %P of `%+D'", parmnum, fndecl); else if (errorcount > savee) cp_error_at ("in passing argument %P of `%+D'", parmnum, fndecl); } return rhs; } rhs = require_complete_type (rhs); if (rhs == error_mark_node) return error_mark_node; if (exp != 0) exp = require_complete_type (exp); if (exp == error_mark_node) return error_mark_node; if (TREE_CODE (rhstype) == REFERENCE_TYPE) rhstype = TREE_TYPE (rhstype); if (TYPE_LANG_SPECIFIC (type) && (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type))) return build_signature_pointer_constructor (type, rhs); if (IS_AGGR_TYPE (type) && (TYPE_NEEDS_CONSTRUCTING (type) || TREE_HAS_CONSTRUCTOR (rhs))) { if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype)) { /* This is sufficient to perform initialization. No need, apparently, to go through X(X&) to do first-cut initialization. Return through a TARGET_EXPR so that we get cleanups if it is used. */ if (TREE_CODE (rhs) == CALL_EXPR) { rhs = build_cplus_new (type, rhs, 0); return rhs; } /* Handle the case of default parameter initialization and initialization of static variables. */ else if (TREE_CODE (rhs) == TARGET_EXPR) return rhs; else if (TREE_CODE (rhs) == INDIRECT_REF && TREE_HAS_CONSTRUCTOR (rhs)) { my_friendly_assert (TREE_CODE (TREE_OPERAND (rhs, 0)) == CALL_EXPR, 318); if (exp) { my_friendly_assert (TREE_VALUE (TREE_OPERAND (TREE_OPERAND (rhs, 0), 1)) == NULL_TREE, 316); TREE_VALUE (TREE_OPERAND (TREE_OPERAND (rhs, 0), 1)) = build_unary_op (ADDR_EXPR, exp, 0); } else rhs = build_cplus_new (type, TREE_OPERAND (rhs, 0), 0); return rhs; } else if (TYPE_HAS_TRIVIAL_INIT_REF (type)) return rhs; } if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype) || (IS_AGGR_TYPE (rhstype) && UNIQUELY_DERIVED_FROM_P (type, rhstype))) { if (TYPE_HAS_INIT_REF (type)) { tree init = build_method_call (exp, constructor_name_full (type), build_tree_list (NULL_TREE, rhs), TYPE_BINFO (type), LOOKUP_NORMAL); if (init == error_mark_node) return error_mark_node; if (exp == 0) { exp = build_cplus_new (type, init, 0); return exp; } return build (COMPOUND_EXPR, type, init, exp); } /* ??? The following warnings are turned off because this is another place where the default X(X&) constructor is implemented. */ if (TYPE_HAS_ASSIGNMENT (type)) cp_warning ("bitwise copy: `%T' defines operator=", type); if (TREE_CODE (TREE_TYPE (rhs)) == REFERENCE_TYPE) rhs = convert_from_reference (rhs); if (type != rhstype) { tree nrhs = build1 (NOP_EXPR, type, rhs); TREE_CONSTANT (nrhs) = TREE_CONSTANT (rhs); rhs = nrhs; } return rhs; } return cp_convert (type, rhs, CONV_OLD_CONVERT, flags); } if (type == TREE_TYPE (rhs)) { if (TREE_READONLY_DECL_P (rhs)) rhs = decl_constant_value (rhs); return rhs; } return convert_for_assignment (type, rhs, errtype, fndecl, parmnum); } /* Expand an ASM statement with operands, handling output operands that are not variables or INDIRECT_REFS by transforming such cases into cases that expand_asm_operands can handle. Arguments are same as for expand_asm_operands. We don't do default conversions on all inputs, because it can screw up operands that are expected to be in memory. */ void c_expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line) tree string, outputs, inputs, clobbers; int vol; char *filename; int line; { int noutputs = list_length (outputs); register int i; /* o[I] is the place that output number I should be written. */ register tree *o = (tree *) alloca (noutputs * sizeof (tree)); register tree tail; /* Record the contents of OUTPUTS before it is modified. */ for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) o[i] = TREE_VALUE (tail); /* Generate the ASM_OPERANDS insn; store into the TREE_VALUEs of OUTPUTS some trees for where the values were actually stored. */ expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line); /* Copy all the intermediate outputs into the specified outputs. */ for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) { if (o[i] != TREE_VALUE (tail)) { expand_expr (build_modify_expr (o[i], NOP_EXPR, TREE_VALUE (tail)), const0_rtx, VOIDmode, 0); free_temp_slots (); } /* Detect modification of read-only values. (Otherwise done by build_modify_expr.) */ else { tree type = TREE_TYPE (o[i]); if (TYPE_READONLY (type) || ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE) && C_TYPE_FIELDS_READONLY (type))) readonly_error (o[i], "modification by `asm'", 1); } } /* Those MODIFY_EXPRs could do autoincrements. */ emit_queue (); } /* Expand a C `return' statement. RETVAL is the expression for what to return, or a null pointer for `return;' with no value. C++: upon seeing a `return', we must call destructors on all variables in scope which had constructors called on them. This means that if in a destructor, the base class destructors must be called before returning. The RETURN statement in C++ has initialization semantics. */ void c_expand_return (retval) tree retval; { extern struct nesting *cond_stack, *loop_stack, *case_stack; extern tree dtor_label, ctor_label; tree result = DECL_RESULT (current_function_decl); tree valtype = TREE_TYPE (result); register int use_temp = 0; int returns_value = 1; if (TREE_THIS_VOLATILE (current_function_decl)) warning ("function declared `noreturn' has a `return' statement"); if (retval == error_mark_node) { current_function_returns_null = 1; return; } if (retval == NULL_TREE) { /* A non-named return value does not count. */ /* Can't just return from a destructor. */ if (dtor_label) { expand_goto (dtor_label); return; } if (DECL_CONSTRUCTOR_P (current_function_decl)) retval = current_class_decl; else if (DECL_NAME (result) != NULL_TREE && TREE_CODE (valtype) != VOID_TYPE) retval = result; else { current_function_returns_null = 1; if (valtype != NULL_TREE && TREE_CODE (valtype) != VOID_TYPE) { if (DECL_NAME (DECL_RESULT (current_function_decl)) == NULL_TREE) { pedwarn ("`return' with no value, in function returning non-void"); /* Clear this, so finish_function won't say that we reach the end of a non-void function (which we don't, we gave a return!). */ current_function_returns_null = 0; } } expand_null_return (); return; } } else if (DECL_CONSTRUCTOR_P (current_function_decl) && retval != current_class_decl) { error ("return from a constructor: use `this = ...' instead"); retval = current_class_decl; } if (valtype == NULL_TREE || TREE_CODE (valtype) == VOID_TYPE) { current_function_returns_null = 1; /* We do this here so we'll avoid a warning about how the function "may or may not return a value" in finish_function. */ returns_value = 0; if (retval) pedwarn ("`return' with a value, in function returning void"); expand_return (retval); } /* Add some useful error checking for C++. */ else if (TREE_CODE (valtype) == REFERENCE_TYPE) { tree whats_returned; tree tmp_result = result; /* Don't initialize directly into a non-BLKmode retval, since that could lose when being inlined by another caller. (GCC can't read the function return register in an inline function when the return value is being ignored). */ if (result && TYPE_MODE (TREE_TYPE (tmp_result)) != BLKmode) tmp_result = 0; /* convert to reference now, so we can give error if we return an reference to a non-lvalue. */ retval = convert_for_initialization (tmp_result, valtype, retval, LOOKUP_NORMAL, "return", NULL_TREE, 0); /* Sort through common things to see what it is we are returning. */ whats_returned = retval; if (TREE_CODE (whats_returned) == COMPOUND_EXPR) { whats_returned = TREE_OPERAND (whats_returned, 1); if (TREE_CODE (whats_returned) == ADDR_EXPR) whats_returned = TREE_OPERAND (whats_returned, 0); } if (TREE_CODE (whats_returned) == ADDR_EXPR) { whats_returned = TREE_OPERAND (whats_returned, 0); while (TREE_CODE (whats_returned) == NEW_EXPR || TREE_CODE (whats_returned) == TARGET_EXPR || TREE_CODE (whats_returned) == WITH_CLEANUP_EXPR) { /* Get the target. */ whats_returned = TREE_OPERAND (whats_returned, 0); warning ("returning reference to temporary"); } } if (TREE_CODE (whats_returned) == VAR_DECL && DECL_NAME (whats_returned)) { if (TEMP_NAME_P (DECL_NAME (whats_returned))) warning ("reference to non-lvalue returned"); else if (! TREE_STATIC (whats_returned) && IDENTIFIER_LOCAL_VALUE (DECL_NAME (whats_returned))) cp_warning_at ("reference to local variable `%D' returned", whats_returned); } } else if (TREE_CODE (retval) == ADDR_EXPR) { tree whats_returned = TREE_OPERAND (retval, 0); if (TREE_CODE (whats_returned) == VAR_DECL && DECL_NAME (whats_returned) && IDENTIFIER_LOCAL_VALUE (DECL_NAME (whats_returned)) && !TREE_STATIC (whats_returned)) cp_warning_at ("address of local variable `%D' returned", whats_returned); } /* Now deal with possible C++ hair: (1) Compute the return value. (2) If there are aggregate values with destructors which must be cleaned up, clean them (taking care not to clobber the return value). (3) If an X(X&) constructor is defined, the return value must be returned via that. */ /* If we're returning in a register, we can't initialize the return value from a TARGET_EXPR. */ if (TREE_CODE (retval) == TARGET_EXPR && TYPE_MAIN_VARIANT (TREE_TYPE (retval)) == TYPE_MAIN_VARIANT (valtype) && ! current_function_returns_struct) retval = expand_target_expr (retval); if (retval == result /* Watch out for constructors, which "return" aggregates via initialization, but which otherwise "return" a pointer. */ || DECL_CONSTRUCTOR_P (current_function_decl)) { /* This is just an error--it's already been reported. */ if (TYPE_SIZE (valtype) == NULL_TREE) return; if (TYPE_MODE (valtype) != BLKmode && any_pending_cleanups (1)) { retval = get_temp_regvar (valtype, retval); use_temp = obey_regdecls; } } else if (IS_AGGR_TYPE (valtype) && current_function_returns_struct) { expand_aggr_init (result, retval, 0, LOOKUP_ONLYCONVERTING); expand_cleanups_to (NULL_TREE); DECL_INITIAL (result) = NULL_TREE; retval = 0; } else { if (TYPE_MODE (valtype) == VOIDmode) { if (TYPE_MODE (TREE_TYPE (result)) != VOIDmode && warn_return_type) warning ("return of void value in function returning non-void"); expand_expr_stmt (retval); retval = 0; result = 0; } else if (TYPE_MODE (valtype) != BLKmode && any_pending_cleanups (1)) { retval = get_temp_regvar (valtype, retval); expand_cleanups_to (NULL_TREE); use_temp = obey_regdecls; result = 0; } else { retval = convert_for_initialization (result, valtype, retval, LOOKUP_NORMAL, "return", NULL_TREE, 0); DECL_INITIAL (result) = NULL_TREE; } if (retval == error_mark_node) return; } emit_queue (); if (retval != NULL_TREE && TREE_CODE_CLASS (TREE_CODE (retval)) == 'd' && cond_stack == 0 && loop_stack == 0 && case_stack == 0) current_function_return_value = retval; if (result) { /* Everything's great--RETVAL is in RESULT. */ if (original_result_rtx) { store_expr (result, original_result_rtx, 0); expand_cleanups_to (NULL_TREE); use_variable (DECL_RTL (result)); if (ctor_label && TREE_CODE (ctor_label) != ERROR_MARK) expand_goto (ctor_label); else expand_null_return (); } else if (retval && retval != result) { /* Clear this out so the later call to decl_function_context won't end up bombing on us. */ if (DECL_CONTEXT (result) == error_mark_node) DECL_CONTEXT (result) = NULL_TREE; /* Here is where we finally get RETVAL into RESULT. `expand_return' does the magic of protecting RESULT from cleanups. */ retval = fold (build1 (CLEANUP_POINT_EXPR, TREE_TYPE (result), retval)); /* This part _must_ come second, because expand_return looks for the INIT_EXPR as the toplevel node only. :-( */ retval = build (INIT_EXPR, TREE_TYPE (result), result, retval); TREE_SIDE_EFFECTS (retval) = 1; expand_return (retval); } else expand_return (result); } else { /* We may still need to put RETVAL into RESULT. */ result = DECL_RESULT (current_function_decl); if (original_result_rtx) { /* Here we have a named return value that went into memory. We can compute RETVAL into that. */ if (retval) expand_assignment (result, retval, 0, 0); else store_expr (result, original_result_rtx, 0); result = make_tree (TREE_TYPE (result), original_result_rtx); } else if (ctor_label && TREE_CODE (ctor_label) != ERROR_MARK) { /* Here RETVAL is CURRENT_CLASS_DECL, so there's nothing to do. */ expand_goto (ctor_label); } else if (retval) { /* Here is where we finally get RETVAL into RESULT. `expand_return' does the magic of protecting RESULT from cleanups. */ result = build (INIT_EXPR, TREE_TYPE (result), result, retval); TREE_SIDE_EFFECTS (result) = 1; expand_return (result); } else if (TYPE_MODE (TREE_TYPE (result)) != VOIDmode) expand_return (result); } current_function_returns_value = returns_value; #if 0 /* These wind up after the BARRIER, which causes problems for expand_end_binding. What purpose were they supposed to serve? */ if (original_result_rtx) use_variable (original_result_rtx); if (use_temp) use_variable (DECL_RTL (DECL_RESULT (current_function_decl))); #endif /* One way to clear out cleanups that EXPR might generate. Note that this code will really be dead code, but that is ok--cleanups that were needed were handled by the magic of `return'. */ expand_cleanups_to (NULL_TREE); } /* Start a C switch statement, testing expression EXP. Return EXP if it is valid, an error node otherwise. */ tree c_expand_start_case (exp) tree exp; { tree type; register enum tree_code code; /* Convert from references, etc. */ exp = default_conversion (exp); type = TREE_TYPE (exp); code = TREE_CODE (type); if (IS_AGGR_TYPE_CODE (code)) exp = build_type_conversion (CONVERT_EXPR, integer_type_node, exp, 1); if (exp == NULL_TREE) { error ("switch quantity not an integer"); exp = error_mark_node; } type = TREE_TYPE (exp); code = TREE_CODE (type); if (code != INTEGER_TYPE && code != ENUMERAL_TYPE && code != ERROR_MARK) { error ("switch quantity not an integer"); exp = error_mark_node; } else { tree index; exp = default_conversion (exp); type = TREE_TYPE (exp); index = get_unwidened (exp, 0); /* We can't strip a conversion from a signed type to an unsigned, because if we did, int_fits_type_p would do the wrong thing when checking case values for being in range, and it's too hard to do the right thing. */ if (TREE_UNSIGNED (TREE_TYPE (exp)) == TREE_UNSIGNED (TREE_TYPE (index))) exp = index; } expand_start_case (1, fold (build1 (CLEANUP_POINT_EXPR, TREE_TYPE (exp), exp)), type, "switch statement"); return exp; } /* CONSTP remembers whether or not all the intervening pointers in the `to' type have been const. */ int comp_ptr_ttypes_real (to, from, constp) tree to, from; int constp; { for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from)) { if (TREE_CODE (to) != TREE_CODE (from)) return 0; /* Const and volatile mean something different for function types, so the usual checks are not appropriate. */ if (TREE_CODE (to) != FUNCTION_TYPE && TREE_CODE (to) != METHOD_TYPE) { if (TYPE_READONLY (from) > TYPE_READONLY (to) || TYPE_VOLATILE (from) > TYPE_VOLATILE (to)) return 0; if (! constp && (TYPE_READONLY (to) > TYPE_READONLY (from) || TYPE_VOLATILE (to) > TYPE_READONLY (from))) return 0; constp &= TYPE_READONLY (to); } if (TREE_CODE (to) != POINTER_TYPE) return comptypes (TYPE_MAIN_VARIANT (to), TYPE_MAIN_VARIANT (from), 1); } } /* When comparing, say, char ** to char const **, this function takes the 'char *' and 'char const *'. Do not pass non-pointer types to this function. */ int comp_ptr_ttypes (to, from) tree to, from; { return comp_ptr_ttypes_real (to, from, 1); }