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Diffstat (limited to 'contrib/gcc/cp/typeck2.c')
| -rw-r--r-- | contrib/gcc/cp/typeck2.c | 1681 |
1 files changed, 1681 insertions, 0 deletions
diff --git a/contrib/gcc/cp/typeck2.c b/contrib/gcc/cp/typeck2.c new file mode 100644 index 000000000000..653d6a54dc5d --- /dev/null +++ b/contrib/gcc/cp/typeck2.c @@ -0,0 +1,1681 @@ +/* Report error messages, build initializers, and perform + some front-end optimizations 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). */ + +#include "config.h" +#include <stdio.h> +#include "tree.h" +#include "cp-tree.h" +#include "flags.h" + +static tree process_init_constructor (); +extern void pedwarn (), error (); + +extern int errorcount; +extern int sorrycount; + +/* Print an error message stemming from an attempt to use + BASETYPE as a base class for TYPE. */ +tree +error_not_base_type (basetype, type) + tree basetype, type; +{ + if (TREE_CODE (basetype) == FUNCTION_DECL) + basetype = DECL_CLASS_CONTEXT (basetype); + cp_error ("type `%T' is not a base type for type `%T'", basetype, type); + return error_mark_node; +} + +tree +binfo_or_else (parent_or_type, type) + tree parent_or_type, type; +{ + tree binfo; + if (TYPE_MAIN_VARIANT (parent_or_type) == TYPE_MAIN_VARIANT (type)) + return TYPE_BINFO (parent_or_type); + if ((binfo = get_binfo (parent_or_type, TYPE_MAIN_VARIANT (type), 0))) + { + if (binfo == error_mark_node) + return NULL_TREE; + return binfo; + } + error_not_base_type (parent_or_type, type); + return NULL_TREE; +} + +/* Print an error message stemming from an invalid use of an + aggregate type. + + TYPE is the type or binfo which draws the error. + MSG is the message to print. + ARG is an optional argument which may provide more information. */ +void +error_with_aggr_type (type, msg, arg) + tree type; + char *msg; + HOST_WIDE_INT arg; +{ + tree name; + + if (TREE_CODE (type) == TREE_VEC) + type = BINFO_TYPE (type); + + name = TYPE_NAME (type); + if (TREE_CODE (name) == TYPE_DECL) + name = DECL_NAME (name); + error (msg, IDENTIFIER_POINTER (name), arg); +} + +/* According to ARM $7.1.6, "A `const' object may be initialized, but its + value may not be changed thereafter. Thus, we emit hard errors for these, + rather than just pedwarns. If `SOFT' is 1, then we just pedwarn. (For + example, conversions to references.) */ +void +readonly_error (arg, string, soft) + tree arg; + char *string; + int soft; +{ + char *fmt; + void (*fn)(); + + if (soft) + fn = pedwarn; + else + fn = error; + + if (TREE_CODE (arg) == COMPONENT_REF) + { + if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg, 0)))) + fmt = "%s of member `%s' in read-only structure"; + else + fmt = "%s of read-only member `%s'"; + (*fn) (fmt, string, lang_printable_name (TREE_OPERAND (arg, 1))); + } + else if (TREE_CODE (arg) == VAR_DECL) + { + if (DECL_LANG_SPECIFIC (arg) + && DECL_IN_AGGR_P (arg) + && !TREE_STATIC (arg)) + fmt = "%s of constant field `%s'"; + else + fmt = "%s of read-only variable `%s'"; + (*fn) (fmt, string, lang_printable_name (arg)); + } + else if (TREE_CODE (arg) == PARM_DECL) + (*fn) ("%s of read-only parameter `%s'", string, + lang_printable_name (arg)); + else if (TREE_CODE (arg) == INDIRECT_REF + && TREE_CODE (TREE_TYPE (TREE_OPERAND (arg, 0))) == REFERENCE_TYPE + && (TREE_CODE (TREE_OPERAND (arg, 0)) == VAR_DECL + || TREE_CODE (TREE_OPERAND (arg, 0)) == PARM_DECL)) + (*fn) ("%s of read-only reference `%s'", + string, lang_printable_name (TREE_OPERAND (arg, 0))); + else if (TREE_CODE (arg) == RESULT_DECL) + (*fn) ("%s of read-only named return value `%s'", + string, lang_printable_name (arg)); + else + (*fn) ("%s of read-only location", string); +} + +/* Print an error message for invalid use of a type which declares + virtual functions which are not inheritable. */ +void +abstract_virtuals_error (decl, type) + tree decl; + tree type; +{ + tree u = CLASSTYPE_ABSTRACT_VIRTUALS (type); + + if (decl) + { + if (TREE_CODE (decl) == RESULT_DECL) + return; + + if (TREE_CODE (decl) == VAR_DECL) + cp_error ("cannot declare variable `%D' to be of type `%T'", + decl, type); + else if (TREE_CODE (decl) == PARM_DECL) + cp_error ("cannot declare parameter `%D' to be of type `%T'", + decl, type); + else if (TREE_CODE (decl) == FIELD_DECL) + cp_error ("cannot declare field `%D' to be of type `%T'", + decl, type); + else if (TREE_CODE (decl) == FUNCTION_DECL + && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE) + cp_error ("invalid return type for method `%#D'", decl); + else if (TREE_CODE (decl) == FUNCTION_DECL) + cp_error ("invalid return type for function `%#D'", decl); + } + else cp_error ("cannot allocate an object of type `%T'", type); + /* Only go through this once. */ + if (TREE_PURPOSE (u) == NULL_TREE) + { + error (" since the following virtual functions are abstract:"); + TREE_PURPOSE (u) = error_mark_node; + while (u) + { + cp_error ("\t%#D", TREE_VALUE (u)); + u = TREE_CHAIN (u); + } + } + else cp_error (" since type `%T' has abstract virtual functions", type); +} + +/* Print an error message for invalid use of a signature type. + Signatures are treated similar to abstract classes here, they + cannot be instantiated. */ +void +signature_error (decl, type) + tree decl; + tree type; +{ + if (decl) + { + if (TREE_CODE (decl) == RESULT_DECL) + return; + + if (TREE_CODE (decl) == VAR_DECL) + cp_error ("cannot declare variable `%D' to be of signature type `%T'", + decl, type); + else if (TREE_CODE (decl) == PARM_DECL) + cp_error ("cannot declare parameter `%D' to be of signature type `%T'", + decl, type); + else if (TREE_CODE (decl) == FIELD_DECL) + cp_error ("cannot declare field `%D' to be of signature type `%T'", + decl, type); + else if (TREE_CODE (decl) == FUNCTION_DECL + && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE) + cp_error ("invalid return type for method `%#D'", decl); + else if (TREE_CODE (decl) == FUNCTION_DECL) + cp_error ("invalid return type for function `%#D'", decl); + } + else + cp_error ("cannot allocate an object of signature type `%T'", type); +} + +/* Print an error message for invalid use of an incomplete type. + VALUE is the expression that was used (or 0 if that isn't known) + and TYPE is the type that was invalid. */ + +void +incomplete_type_error (value, type) + tree value; + tree type; +{ + char *errmsg; + + /* Avoid duplicate error message. */ + if (TREE_CODE (type) == ERROR_MARK) + return; + + if (value != 0 && (TREE_CODE (value) == VAR_DECL + || TREE_CODE (value) == PARM_DECL)) + error ("`%s' has an incomplete type", + IDENTIFIER_POINTER (DECL_NAME (value))); + else + { + retry: + /* We must print an error message. Be clever about what it says. */ + + switch (TREE_CODE (type)) + { + case RECORD_TYPE: + errmsg = "invalid use of undefined type `struct %s'"; + break; + + case UNION_TYPE: + errmsg = "invalid use of undefined type `union %s'"; + break; + + case ENUMERAL_TYPE: + errmsg = "invalid use of undefined type `enum %s'"; + break; + + case VOID_TYPE: + error ("invalid use of void expression"); + return; + + case ARRAY_TYPE: + if (TYPE_DOMAIN (type)) + { + type = TREE_TYPE (type); + goto retry; + } + error ("invalid use of array with unspecified bounds"); + return; + + case OFFSET_TYPE: + error ("invalid use of member type (did you forget the `&' ?)"); + return; + + default: + my_friendly_abort (108); + } + + error_with_aggr_type (type, errmsg); + } +} + +/* Like error(), but don't call report_error_function(). */ +static void +ack (s, v, v2) + char *s; + HOST_WIDE_INT v; + HOST_WIDE_INT v2; +{ + extern char * progname; + + if (input_filename) + fprintf (stderr, "%s:%d: ", input_filename, lineno); + else + fprintf (stderr, "%s: ", progname); + + fprintf (stderr, s, v, v2); + fprintf (stderr, "\n"); +} + +/* There are times when the compiler can get very confused, confused + to the point of giving up by aborting, simply because of previous + input errors. It is much better to have the user go back and + correct those errors first, and see if it makes us happier, than it + is to abort on him. This is because when one has a 10,000 line + program, and the compiler comes back with ``core dump'', the user + is left not knowing even where to begin to fix things and no place + to even try and work around things. + + The parameter is to uniquely identify the problem to the user, so + that they can say, I am having problem 59, and know that fix 7 will + probably solve their problem. Or, we can document what problem + 59 is, so they can understand how to work around it, should they + ever run into it. + + Note, there will be no more calls in the C++ front end to abort, + because the C++ front end is so unreliable still. The C front end + can get away with calling abort, because for most of the calls to + abort on most machines, it, I suspect, can be proven that it is + impossible to ever call abort. The same is not yet true for C++, + one day, maybe it will be. + + We used to tell people to "fix the above error[s] and try recompiling + the program" via a call to fatal, but that message tended to look + silly. So instead, we just do the equivalent of a call to fatal in the + same situation (call exit). */ + +/* First used: 0 (reserved), Last used: 366. Free: */ + +static int abortcount = 0; + +void +my_friendly_abort (i) + int i; +{ + /* if the previous error came through here, i.e. report_error_function + ended up calling us again, don't just exit; we want a diagnostic of + some kind. */ + if (abortcount == 1) + current_function_decl = NULL_TREE; + else if (errorcount > 0 || sorrycount > 0) + { + if (abortcount > 1) + { + if (i == 0) + ack ("Internal compiler error."); + else + ack ("Internal compiler error %d.", i); + ack ("Please submit a full bug report to `bug-g++@prep.ai.mit.edu'."); + } + else + error ("confused by earlier errors, bailing out"); + + exit (34); + } + ++abortcount; + + if (i == 0) + error ("Internal compiler error."); + else + error ("Internal compiler error %d.", i); + + fatal ("Please submit a full bug report to `bug-g++@prep.ai.mit.edu'."); +} + +void +my_friendly_assert (cond, where) + int cond, where; +{ + if (cond == 0) + my_friendly_abort (where); +} + +/* Return nonzero if VALUE is a valid constant-valued expression + for use in initializing a static variable; one that can be an + element of a "constant" initializer. + + Return null_pointer_node if the value is absolute; + if it is relocatable, return the variable that determines the relocation. + We assume that VALUE has been folded as much as possible; + therefore, we do not need to check for such things as + arithmetic-combinations of integers. */ + +tree +initializer_constant_valid_p (value, endtype) + tree value; + tree endtype; +{ + switch (TREE_CODE (value)) + { + case CONSTRUCTOR: + if (TREE_CODE (TREE_TYPE (value)) == UNION_TYPE + && TREE_CONSTANT (value)) + return + initializer_constant_valid_p (TREE_VALUE (CONSTRUCTOR_ELTS (value)), + endtype); + + return TREE_STATIC (value) ? null_pointer_node : 0; + + case INTEGER_CST: + case REAL_CST: + case STRING_CST: + case COMPLEX_CST: + return null_pointer_node; + + case ADDR_EXPR: + return TREE_OPERAND (value, 0); + + case NON_LVALUE_EXPR: + return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); + + case CONVERT_EXPR: + case NOP_EXPR: + /* Allow conversions between pointer types. */ + if (TREE_CODE (TREE_TYPE (value)) == POINTER_TYPE + && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == POINTER_TYPE) + return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); + + /* Allow conversions between real types. */ + if (TREE_CODE (TREE_TYPE (value)) == REAL_TYPE + && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == REAL_TYPE) + return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); + + /* Allow length-preserving conversions between integer types. */ + if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE + && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == INTEGER_TYPE + && (TYPE_PRECISION (TREE_TYPE (value)) + == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0))))) + return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); + + /* Allow conversions between other integer types only if + explicit value. */ + if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE + && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == INTEGER_TYPE) + { + tree inner = initializer_constant_valid_p (TREE_OPERAND (value, 0), + endtype); + if (inner == null_pointer_node) + return null_pointer_node; + return 0; + } + + /* Allow (int) &foo provided int is as wide as a pointer. */ + if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE + && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == POINTER_TYPE + && (TYPE_PRECISION (TREE_TYPE (value)) + >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0))))) + return initializer_constant_valid_p (TREE_OPERAND (value, 0), + endtype); + + /* Likewise conversions from int to pointers. */ + if (TREE_CODE (TREE_TYPE (value)) == POINTER_TYPE + && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == INTEGER_TYPE + && (TYPE_PRECISION (TREE_TYPE (value)) + <= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0))))) + return initializer_constant_valid_p (TREE_OPERAND (value, 0), + endtype); + + /* Allow conversions to union types if the value inside is okay. */ + if (TREE_CODE (TREE_TYPE (value)) == UNION_TYPE) + return initializer_constant_valid_p (TREE_OPERAND (value, 0), + endtype); + return 0; + + case PLUS_EXPR: + if (TREE_CODE (endtype) == INTEGER_TYPE + && TYPE_PRECISION (endtype) < POINTER_SIZE) + return 0; + { + tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0), + endtype); + tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1), + endtype); + /* If either term is absolute, use the other terms relocation. */ + if (valid0 == null_pointer_node) + return valid1; + if (valid1 == null_pointer_node) + return valid0; + return 0; + } + + case MINUS_EXPR: + if (TREE_CODE (endtype) == INTEGER_TYPE + && TYPE_PRECISION (endtype) < POINTER_SIZE) + return 0; + { + tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0), + endtype); + tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1), + endtype); + /* Win if second argument is absolute. */ + if (valid1 == null_pointer_node) + return valid0; + /* Win if both arguments have the same relocation. + Then the value is absolute. */ + if (valid0 == valid1) + return null_pointer_node; + return 0; + } + } + + return 0; +} + +/* Perform appropriate conversions on the initial value of a variable, + store it in the declaration DECL, + and print any error messages that are appropriate. + If the init is invalid, store an ERROR_MARK. + + C++: Note that INIT might be a TREE_LIST, which would mean that it is + a base class initializer for some aggregate type, hopefully compatible + with DECL. If INIT is a single element, and DECL is an aggregate + type, we silently convert INIT into a TREE_LIST, allowing a constructor + to be called. + + If INIT is a TREE_LIST and there is no constructor, turn INIT + into a CONSTRUCTOR and use standard initialization techniques. + Perhaps a warning should be generated? + + Returns value of initializer if initialization could not be + performed for static variable. In that case, caller must do + the storing. */ + +tree +store_init_value (decl, init) + tree decl, init; +{ + register tree value, type; + + /* If variable's type was invalidly declared, just ignore it. */ + + type = TREE_TYPE (decl); + if (TREE_CODE (type) == ERROR_MARK) + return NULL_TREE; + +#if 0 + /* This breaks arrays, and should not have any effect for other decls. */ + /* Take care of C++ business up here. */ + type = TYPE_MAIN_VARIANT (type); +#endif + + if (IS_AGGR_TYPE (type)) + { + if (! TYPE_HAS_TRIVIAL_INIT_REF (type) + && TREE_CODE (init) != CONSTRUCTOR) + my_friendly_abort (109); + + /* Although we are not allowed to declare variables of signature + type, we complain about a possible constructor call in such a + declaration as well. */ + if (TREE_CODE (init) == TREE_LIST + && IS_SIGNATURE (type)) + { + cp_error ("constructor syntax cannot be used with signature type `%T'", + type); + init = error_mark_node; + } + else if (TREE_CODE (init) == TREE_LIST) + { + cp_error ("constructor syntax used, but no constructor declared for type `%T'", type); + init = build_nt (CONSTRUCTOR, NULL_TREE, nreverse (init)); + } +#if 0 + if (TREE_CODE (init) == CONSTRUCTOR) + { + tree field; + tree funcs; + int func; + + /* Check that we're really an aggregate as ARM 8.4.1 defines it. */ + if (CLASSTYPE_N_BASECLASSES (type)) + cp_error_at ("initializer list construction invalid for derived class object `%D'", decl); + if (CLASSTYPE_VTBL_PTR (type)) + cp_error_at ("initializer list construction invalid for polymorphic class object `%D'", decl); + if (TYPE_NEEDS_CONSTRUCTING (type)) + { + cp_error_at ("initializer list construction invalid for `%D'", decl); + error ("due to the presence of a constructor"); + } + for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) + if (TREE_PRIVATE (field) || TREE_PROTECTED (field)) + { + cp_error_at ("initializer list construction invalid for `%D'", decl); + cp_error_at ("due to non-public access of member `%D'", field); + } + funcs = TYPE_METHODS (type); + if (funcs) + for (func = 0; func < TREE_VEC_LENGTH (funcs); func++) + { + field = TREE_VEC_ELT (funcs, func); + if (field && (TREE_PRIVATE (field) || TREE_PROTECTED (field))) + { + cp_error_at ("initializer list construction invalid for `%D'", decl); + cp_error_at ("due to non-public access of member `%D'", field); + } + } + } +#endif + } + else if (TREE_CODE (init) == TREE_LIST + && TREE_TYPE (init) != unknown_type_node) + { + if (TREE_CODE (decl) == RESULT_DECL) + { + if (TREE_CHAIN (init)) + { + warning ("comma expression used to initialize return value"); + init = build_compound_expr (init); + } + else + init = TREE_VALUE (init); + } + else if (TREE_TYPE (init) != 0 + && TREE_CODE (TREE_TYPE (init)) == OFFSET_TYPE) + { + /* Use the type of our variable to instantiate + the type of our initializer. */ + init = instantiate_type (type, init, 1); + } + else if (TREE_CODE (init) == TREE_LIST + && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE) + { + error ("cannot initialize arrays using this syntax"); + return NULL_TREE; + } + else + { + /* We get here with code like `int a (2);' */ + + if (TREE_CHAIN (init) != NULL_TREE) + { + pedwarn ("initializer list being treated as compound expression"); + init = build_compound_expr (init); + } + else + init = TREE_VALUE (init); + } + } + + /* End of special C++ code. */ + + /* Digest the specified initializer into an expression. */ + + value = digest_init (type, init, (tree *) 0); + + /* Store the expression if valid; else report error. */ + + if (TREE_CODE (value) == ERROR_MARK) + ; + else if (TREE_STATIC (decl) + && (! TREE_CONSTANT (value) + || ! initializer_constant_valid_p (value, TREE_TYPE (value)) +#if 0 + /* A STATIC PUBLIC int variable doesn't have to be + run time inited when doing pic. (mrs) */ + /* Since ctors and dtors are the only things that can + reference vtables, and they are always written down + the the vtable definition, we can leave the + vtables in initialized data space. + However, other initialized data cannot be initialized + this way. Instead a global file-level initializer + must do the job. */ + || (flag_pic && !DECL_VIRTUAL_P (decl) && TREE_PUBLIC (decl)) +#endif + )) + + return value; +#if 0 /* No, that's C. jason 9/19/94 */ + else + { + if (pedantic && TREE_CODE (value) == CONSTRUCTOR + /* Don't complain about non-constant initializers of + signature tables and signature pointers/references. */ + && ! (TYPE_LANG_SPECIFIC (type) + && (IS_SIGNATURE (type) + || IS_SIGNATURE_POINTER (type) + || IS_SIGNATURE_REFERENCE (type)))) + { + if (! TREE_CONSTANT (value) || ! TREE_STATIC (value)) + pedwarn ("ANSI C++ forbids non-constant aggregate initializer expressions"); + } + } +#endif + DECL_INITIAL (decl) = value; + return NULL_TREE; +} + +/* Digest the parser output INIT as an initializer for type TYPE. + Return a C expression of type TYPE to represent the initial value. + + If TAIL is nonzero, it points to a variable holding a list of elements + of which INIT is the first. We update the list stored there by + removing from the head all the elements that we use. + Normally this is only one; we use more than one element only if + TYPE is an aggregate and INIT is not a constructor. */ + +tree +digest_init (type, init, tail) + tree type, init, *tail; +{ + enum tree_code code = TREE_CODE (type); + tree element = NULL_TREE; + tree old_tail_contents; + /* Nonzero if INIT is a braced grouping, which comes in as a CONSTRUCTOR + tree node which has no TREE_TYPE. */ + int raw_constructor; + + /* By default, assume we use one element from a list. + We correct this later in the sole case where it is not true. */ + + if (tail) + { + old_tail_contents = *tail; + *tail = TREE_CHAIN (*tail); + } + + if (init == error_mark_node || (TREE_CODE (init) == TREE_LIST + && TREE_VALUE (init) == error_mark_node)) + return error_mark_node; + + /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ + if (TREE_CODE (init) == NON_LVALUE_EXPR) + init = TREE_OPERAND (init, 0); + + if (init && TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (type)) + init = default_conversion (init); + + if (init && TYPE_PTRMEMFUNC_P (type) + && ((TREE_CODE (init) == ADDR_EXPR + && ((TREE_CODE (TREE_TYPE (init)) == POINTER_TYPE + && TREE_CODE (TREE_TYPE (TREE_TYPE (init))) == METHOD_TYPE) + || TREE_CODE (TREE_OPERAND (init, 0)) == TREE_LIST)) + || TREE_CODE (init) == TREE_LIST + || integer_zerop (init) + || (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init))))) + { + return build_ptrmemfunc (TYPE_PTRMEMFUNC_FN_TYPE (type), init, 0); + } + + raw_constructor = TREE_CODE (init) == CONSTRUCTOR && TREE_TYPE (init) == 0; + + if (init && raw_constructor + && CONSTRUCTOR_ELTS (init) != 0 + && TREE_CHAIN (CONSTRUCTOR_ELTS (init)) == 0) + { + element = TREE_VALUE (CONSTRUCTOR_ELTS (init)); + /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ + if (element && TREE_CODE (element) == NON_LVALUE_EXPR) + element = TREE_OPERAND (element, 0); + if (element == error_mark_node) + return element; + } + + /* Any type can be initialized from an expression of the same type, + optionally with braces. */ + + if (init && TREE_TYPE (init) + && (TYPE_MAIN_VARIANT (TREE_TYPE (init)) == type + || (code == ARRAY_TYPE && comptypes (TREE_TYPE (init), type, 1)))) + { + if (pedantic && code == ARRAY_TYPE + && TREE_CODE (init) != STRING_CST) + pedwarn ("ANSI C++ forbids initializing array from array expression"); + if (TREE_CODE (init) == CONST_DECL) + init = DECL_INITIAL (init); + else if (TREE_READONLY_DECL_P (init)) + init = decl_constant_value (init); + return init; + } + + if (element && (TREE_TYPE (element) == type + || (code == ARRAY_TYPE && TREE_TYPE (element) + && comptypes (TREE_TYPE (element), type, 1)))) + { + if (pedantic && code == ARRAY_TYPE) + pedwarn ("ANSI C++ forbids initializing array from array expression"); + if (pedantic && (code == RECORD_TYPE || code == UNION_TYPE)) + pedwarn ("ANSI C++ forbids single nonscalar initializer with braces"); + if (TREE_CODE (element) == CONST_DECL) + element = DECL_INITIAL (element); + else if (TREE_READONLY_DECL_P (element)) + element = decl_constant_value (element); + return element; + } + + /* Initialization of an array of chars from a string constant + optionally enclosed in braces. */ + + if (code == ARRAY_TYPE) + { + tree typ1 = TYPE_MAIN_VARIANT (TREE_TYPE (type)); + if ((typ1 == char_type_node + || typ1 == signed_char_type_node + || typ1 == unsigned_char_type_node + || typ1 == unsigned_wchar_type_node + || typ1 == signed_wchar_type_node) + && ((init && TREE_CODE (init) == STRING_CST) + || (element && TREE_CODE (element) == STRING_CST))) + { + tree string = element ? element : init; + + if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (string))) + != char_type_node) + && TYPE_PRECISION (typ1) == BITS_PER_UNIT) + { + error ("char-array initialized from wide string"); + return error_mark_node; + } + if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (string))) + == char_type_node) + && TYPE_PRECISION (typ1) != BITS_PER_UNIT) + { + error ("int-array initialized from non-wide string"); + return error_mark_node; + } + + if (pedantic + && typ1 != char_type_node + && typ1 != signed_char_type_node + && typ1 != unsigned_char_type_node) + pedwarn ("ANSI C++ forbids string initializer except for `char' elements"); + TREE_TYPE (string) = type; + if (TYPE_DOMAIN (type) != 0 + && TREE_CONSTANT (TYPE_SIZE (type))) + { + register int size + = TREE_INT_CST_LOW (TYPE_SIZE (type)); + size = (size + BITS_PER_UNIT - 1) / BITS_PER_UNIT; + /* In C it is ok to subtract 1 from the length of the string + because it's ok to ignore the terminating null char that is + counted in the length of the constant, but in C++ this would + be invalid. */ + if (size < TREE_STRING_LENGTH (string)) + pedwarn ("initializer-string for array of chars is too long"); + } + return string; + } + } + + /* Handle scalar types, including conversions, + and signature pointers and references. */ + + if (code == INTEGER_TYPE || code == REAL_TYPE || code == POINTER_TYPE + || code == ENUMERAL_TYPE || code == REFERENCE_TYPE + || code == BOOLEAN_TYPE + || (code == RECORD_TYPE && ! raw_constructor + && (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type)))) + { + if (raw_constructor) + { + if (element == 0) + { + error ("initializer for scalar variable requires one element"); + return error_mark_node; + } + init = element; + } + while (TREE_CODE (init) == CONSTRUCTOR) + { + cp_pedwarn ("braces around scalar initializer for `%T'", type); + init = CONSTRUCTOR_ELTS (init); + if (TREE_CHAIN (init)) + cp_pedwarn ("ignoring extra initializers for `%T'", type); + init = TREE_VALUE (init); + } + + return convert_for_initialization (0, type, init, LOOKUP_NORMAL, + "initialization", NULL_TREE, 0); + } + + /* Come here only for records and arrays (and unions with constructors). */ + + if (TYPE_SIZE (type) && ! TREE_CONSTANT (TYPE_SIZE (type))) + { + cp_error ("variable-sized object of type `%T' may not be initialized", + type); + return error_mark_node; + } + + if (code == ARRAY_TYPE || code == RECORD_TYPE || code == UNION_TYPE) + { + if (raw_constructor && TYPE_NON_AGGREGATE_CLASS (type)) + { + cp_error ("subobject of type `%T' must be initialized by constructor, not by `%E'", + type, init); + return error_mark_node; + } + else if (raw_constructor) + return process_init_constructor (type, init, (tree *)0); + else if (TYPE_NON_AGGREGATE_CLASS (type)) + { + /* This can only be reached when caller is initializing + ARRAY_TYPE. In that case, we don't want to convert + INIT to TYPE. We will let `expand_vec_init' do it. */ + return init; + } + else if (tail != 0) + { + *tail = old_tail_contents; + return process_init_constructor (type, 0, tail); + } + else if (flag_traditional) + /* Traditionally one can say `char x[100] = 0;'. */ + return process_init_constructor (type, + build_nt (CONSTRUCTOR, 0, + tree_cons (0, init, 0)), + 0); + if (code != ARRAY_TYPE) + return convert_for_initialization (0, type, init, LOOKUP_NORMAL, + "initialization", NULL_TREE, 0); + } + + error ("invalid initializer"); + return error_mark_node; +} + +/* Process a constructor for a variable of type TYPE. + The constructor elements may be specified either with INIT or with ELTS, + only one of which should be non-null. + + If INIT is specified, it is a CONSTRUCTOR node which is specifically + and solely for initializing this datum. + + If ELTS is specified, it is the address of a variable containing + a list of expressions. We take as many elements as we need + from the head of the list and update the list. + + In the resulting constructor, TREE_CONSTANT is set if all elts are + constant, and TREE_STATIC is set if, in addition, all elts are simple enough + constants that the assembler and linker can compute them. */ + +static tree +process_init_constructor (type, init, elts) + tree type, init, *elts; +{ + register tree tail; + /* List of the elements of the result constructor, + in reverse order. */ + register tree members = NULL; + tree result; + int allconstant = 1; + int allsimple = 1; + int erroneous = 0; + + /* Make TAIL be the list of elements to use for the initialization, + no matter how the data was given to us. */ + + if (elts) + { + if (warn_missing_braces) + warning ("aggregate has a partly bracketed initializer"); + tail = *elts; + } + else + tail = CONSTRUCTOR_ELTS (init); + + /* Gobble as many elements as needed, and make a constructor or initial value + for each element of this aggregate. Chain them together in result. + If there are too few, use 0 for each scalar ultimate component. */ + + if (TREE_CODE (type) == ARRAY_TYPE) + { + tree domain = TYPE_DOMAIN (type); + register long len; + register int i; + + if (domain) + len = (TREE_INT_CST_LOW (TYPE_MAX_VALUE (domain)) + - TREE_INT_CST_LOW (TYPE_MIN_VALUE (domain)) + + 1); + else + len = -1; /* Take as many as there are */ + + for (i = 0; (len < 0 || i < len) && tail != 0; i++) + { + register tree next1; + + if (TREE_VALUE (tail) != 0) + { + tree tail1 = tail; + next1 = digest_init (TYPE_MAIN_VARIANT (TREE_TYPE (type)), + TREE_VALUE (tail), &tail1); + if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (type)) + && TYPE_MAIN_VARIANT (TREE_TYPE (type)) != TYPE_MAIN_VARIANT (TREE_TYPE (next1))) + { + /* The fact this needs to be done suggests this code needs + to be totally rewritten. */ + next1 = convert_for_initialization (NULL_TREE, TREE_TYPE (type), next1, LOOKUP_NORMAL, "initialization", NULL_TREE, 0); + } + my_friendly_assert (tail1 == 0 + || TREE_CODE (tail1) == TREE_LIST, 319); + if (tail == tail1 && len < 0) + { + error ("non-empty initializer for array of empty elements"); + /* Just ignore what we were supposed to use. */ + tail1 = NULL_TREE; + } + tail = tail1; + } + else + { + next1 = error_mark_node; + tail = TREE_CHAIN (tail); + } + + if (next1 == error_mark_node) + erroneous = 1; + else if (!TREE_CONSTANT (next1)) + allconstant = 0; + else if (! initializer_constant_valid_p (next1, TREE_TYPE (next1))) + allsimple = 0; + members = tree_cons (NULL_TREE, next1, members); + } + } + if (TREE_CODE (type) == RECORD_TYPE) + { + register tree field; + + if (tail) + { + if (TYPE_USES_VIRTUAL_BASECLASSES (type)) + { + sorry ("initializer list for object of class with virtual baseclasses"); + return error_mark_node; + } + + if (TYPE_BINFO_BASETYPES (type)) + { + sorry ("initializer list for object of class with baseclasses"); + return error_mark_node; + } + + if (TYPE_VIRTUAL_P (type)) + { + sorry ("initializer list for object using virtual functions"); + return error_mark_node; + } + } + + for (field = TYPE_FIELDS (type); field && tail; + field = TREE_CHAIN (field)) + { + register tree next1; + + if (! DECL_NAME (field)) + { + members = tree_cons (field, integer_zero_node, members); + continue; + } + + if (TREE_CODE (field) != FIELD_DECL) + continue; + + if (TREE_VALUE (tail) != 0) + { + tree tail1 = tail; + + next1 = digest_init (TREE_TYPE (field), + TREE_VALUE (tail), &tail1); + my_friendly_assert (tail1 == 0 + || TREE_CODE (tail1) == TREE_LIST, 320); + tail = tail1; + } + else + { + next1 = error_mark_node; + tail = TREE_CHAIN (tail); + } + + if (next1 == error_mark_node) + erroneous = 1; + else if (!TREE_CONSTANT (next1)) + allconstant = 0; + else if (! initializer_constant_valid_p (next1, TREE_TYPE (next1))) + allsimple = 0; + members = tree_cons (field, next1, members); + } + for (; field; field = TREE_CHAIN (field)) + { + if (TREE_CODE (field) != FIELD_DECL) + continue; + + /* Does this field have a default initialization? */ + if (DECL_INITIAL (field)) + { + register tree next1 = DECL_INITIAL (field); + if (TREE_CODE (next1) == ERROR_MARK) + erroneous = 1; + else if (!TREE_CONSTANT (next1)) + allconstant = 0; + else if (! initializer_constant_valid_p (next1, TREE_TYPE (next1))) + allsimple = 0; + members = tree_cons (field, next1, members); + } + else if (TREE_READONLY (field)) + error ("uninitialized const member `%s'", + IDENTIFIER_POINTER (DECL_NAME (field))); + else if (TYPE_LANG_SPECIFIC (TREE_TYPE (field)) + && CLASSTYPE_READONLY_FIELDS_NEED_INIT (TREE_TYPE (field))) + error ("member `%s' with uninitialized const fields", + IDENTIFIER_POINTER (DECL_NAME (field))); + else if (TREE_CODE (TREE_TYPE (field)) == REFERENCE_TYPE) + error ("member `%s' is uninitialized reference", + IDENTIFIER_POINTER (DECL_NAME (field))); + } + } + + if (TREE_CODE (type) == UNION_TYPE) + { + register tree field = TYPE_FIELDS (type); + register tree next1; + + /* Find the first named field. ANSI decided in September 1990 + that only named fields count here. */ + while (field && DECL_NAME (field) == 0) + field = TREE_CHAIN (field); + + /* If this element specifies a field, initialize via that field. */ + if (TREE_PURPOSE (tail) != NULL_TREE) + { + int win = 0; + + if (TREE_CODE (TREE_PURPOSE (tail)) == FIELD_DECL) + /* Handle the case of a call by build_c_cast. */ + field = TREE_PURPOSE (tail), win = 1; + else if (TREE_CODE (TREE_PURPOSE (tail)) != IDENTIFIER_NODE) + error ("index value instead of field name in union initializer"); + else + { + tree temp; + for (temp = TYPE_FIELDS (type); + temp; + temp = TREE_CHAIN (temp)) + if (DECL_NAME (temp) == TREE_PURPOSE (tail)) + break; + if (temp) + field = temp, win = 1; + else + error ("no field `%s' in union being initialized", + IDENTIFIER_POINTER (TREE_PURPOSE (tail))); + } + if (!win) + TREE_VALUE (tail) = error_mark_node; + } + else if (field == 0) + { + cp_error ("union `%T' with no named members cannot be initialized", + type); + TREE_VALUE (tail) = error_mark_node; + } + + if (TREE_VALUE (tail) != 0) + { + tree tail1 = tail; + + next1 = digest_init (TREE_TYPE (field), + TREE_VALUE (tail), &tail1); + if (tail1 != 0 && TREE_CODE (tail1) != TREE_LIST) + my_friendly_abort (357); + tail = tail1; + } + else + { + next1 = error_mark_node; + tail = TREE_CHAIN (tail); + } + + if (next1 == error_mark_node) + erroneous = 1; + else if (!TREE_CONSTANT (next1)) + allconstant = 0; + else if (initializer_constant_valid_p (next1, TREE_TYPE (next1)) == 0) + allsimple = 0; + members = tree_cons (field, next1, members); + } + + /* If arguments were specified as a list, just remove the ones we used. */ + if (elts) + *elts = tail; + /* If arguments were specified as a constructor, + complain unless we used all the elements of the constructor. */ + else if (tail) + pedwarn ("excess elements in aggregate initializer"); + + if (erroneous) + return error_mark_node; + + result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (members)); + if (init) + TREE_HAS_CONSTRUCTOR (result) = TREE_HAS_CONSTRUCTOR (init); + if (allconstant) TREE_CONSTANT (result) = 1; + if (allconstant && allsimple) TREE_STATIC (result) = 1; + return result; +} + +/* Given a structure or union value DATUM, construct and return + the structure or union component which results from narrowing + that value by the types specified in TYPES. For example, given the + hierarchy + + class L { int ii; }; + class A : L { ... }; + class B : L { ... }; + class C : A, B { ... }; + + and the declaration + + C x; + + then the expression + + x::C::A::L::ii refers to the ii member of the L part of + of A part of the C object named by X. In this case, + DATUM would be x, and TYPES would be a SCOPE_REF consisting of + + SCOPE_REF + SCOPE_REF + C A + L + + The last entry in the SCOPE_REF is always an IDENTIFIER_NODE. + +*/ + +tree +build_scoped_ref (datum, types) + tree datum; + tree types; +{ + tree ref; + tree type = TREE_TYPE (datum); + + if (datum == error_mark_node) + return error_mark_node; + + if (TREE_CODE (type) == REFERENCE_TYPE) + type = TREE_TYPE (type); + + type = TYPE_MAIN_VARIANT (type); + + if (TREE_CODE (types) == SCOPE_REF) + { + /* We have some work to do. */ + struct type_chain + { tree type; struct type_chain *next; } + *chain = NULL, *head = NULL, scratch; + ref = build_unary_op (ADDR_EXPR, datum, 0); + while (TREE_CODE (types) == SCOPE_REF) + { + tree t = TREE_OPERAND (types, 1); + if (is_aggr_typedef (t, 1)) + { + head = (struct type_chain *)alloca (sizeof (struct type_chain)); + head->type = IDENTIFIER_TYPE_VALUE (t); + head->next = chain; + chain = head; + types = TREE_OPERAND (types, 0); + } + else return error_mark_node; + } + if (! is_aggr_typedef (types, 1)) + return error_mark_node; + + head = &scratch; + head->type = IDENTIFIER_TYPE_VALUE (types); + head->next = chain; + chain = head; + while (chain) + { + tree binfo = chain->type; + type = TREE_TYPE (TREE_TYPE (ref)); + if (binfo != TYPE_BINFO (type)) + { + binfo = get_binfo (binfo, type, 1); + if (binfo == error_mark_node) + return error_mark_node; + if (binfo == 0) + return error_not_base_type (chain->type, type); + ref = convert_pointer_to (binfo, ref); + } + chain = chain->next; + } + return build_indirect_ref (ref, "(compiler error in build_scoped_ref)"); + } + + /* This is an easy conversion. */ + if (is_aggr_typedef (types, 1)) + { + tree binfo = TYPE_BINFO (IDENTIFIER_TYPE_VALUE (types)); + if (binfo != TYPE_BINFO (type)) + { + binfo = get_binfo (binfo, type, 1); + if (binfo == error_mark_node) + return error_mark_node; + if (binfo == 0) + return error_not_base_type (IDENTIFIER_TYPE_VALUE (types), type); + } + + switch (TREE_CODE (datum)) + { + 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: + ref = convert_pointer_to (binfo, + build_unary_op (ADDR_EXPR, TREE_OPERAND (datum, 0), 0)); + break; + default: + ref = convert_pointer_to (binfo, + build_unary_op (ADDR_EXPR, datum, 0)); + } + return build_indirect_ref (ref, "(compiler error in build_scoped_ref)"); + } + return error_mark_node; +} + +/* Build a reference to an object specified by the C++ `->' operator. + Usually this just involves dereferencing the object, but if the + `->' operator is overloaded, then such overloads must be + performed until an object which does not have the `->' operator + overloaded is found. An error is reported when circular pointer + delegation is detected. */ +tree +build_x_arrow (datum) + tree datum; +{ + tree types_memoized = NULL_TREE; + register tree rval = datum; + tree type = TREE_TYPE (rval); + tree last_rval; + + if (type == error_mark_node) + return error_mark_node; + + if (TREE_CODE (rval) == OFFSET_REF) + { + rval = resolve_offset_ref (datum); + type = TREE_TYPE (rval); + } + + if (TREE_CODE (type) == REFERENCE_TYPE) + { + rval = convert_from_reference (rval); + type = TREE_TYPE (rval); + } + + if (IS_AGGR_TYPE (type) && TYPE_OVERLOADS_ARROW (type)) + { + while ((rval = build_opfncall (COMPONENT_REF, LOOKUP_NORMAL, rval, NULL_TREE, NULL_TREE))) + { + if (rval == error_mark_node) + return error_mark_node; + + if (value_member (TREE_TYPE (rval), types_memoized)) + { + error ("circular pointer delegation detected"); + return error_mark_node; + } + else + { + types_memoized = tree_cons (NULL_TREE, TREE_TYPE (rval), + types_memoized); + } + last_rval = rval; + } + if (TREE_CODE (TREE_TYPE (last_rval)) == REFERENCE_TYPE) + last_rval = convert_from_reference (last_rval); + } + else + last_rval = default_conversion (rval); + + /* Signature pointers are not dereferenced. */ + if (TYPE_LANG_SPECIFIC (TREE_TYPE (last_rval)) + && IS_SIGNATURE_POINTER (TREE_TYPE (last_rval))) + return last_rval; + + if (TREE_CODE (TREE_TYPE (last_rval)) == POINTER_TYPE) + return build_indirect_ref (last_rval, NULL_PTR); + + if (types_memoized) + error ("result of `operator->()' yields non-pointer result"); + else + error ("base operand of `->' is not a pointer"); + return error_mark_node; +} + +/* Make an expression to refer to the COMPONENT field of + structure or union value DATUM. COMPONENT is an arbitrary + expression. DATUM has not already been checked out to be of + aggregate type. + + For C++, COMPONENT may be a TREE_LIST. This happens when we must + return an object of member type to a method of the current class, + but there is not yet enough typing information to know which one. + As a special case, if there is only one method by that name, + it is returned. Otherwise we return an expression which other + routines will have to know how to deal with later. */ +tree +build_m_component_ref (datum, component) + tree datum, component; +{ + tree type; + tree objtype = TREE_TYPE (datum); + tree rettype; + tree binfo; + + if (TYPE_PTRMEMFUNC_P (TREE_TYPE (component))) + { + type = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (component))); + rettype = type; + } + else + { + component = build_indirect_ref (component, NULL_PTR); + type = TREE_TYPE (component); + rettype = TREE_TYPE (TREE_TYPE (component)); + } + + if (datum == error_mark_node || component == error_mark_node) + return error_mark_node; + + if (TREE_CODE (type) != OFFSET_TYPE && TREE_CODE (type) != METHOD_TYPE) + { + cp_error ("`%E' cannot be used as a member pointer, since it is of type `%T'", component, type); + return error_mark_node; + } + + if (TREE_CODE (objtype) == REFERENCE_TYPE) + objtype = TREE_TYPE (objtype); + objtype = TYPE_MAIN_VARIANT (objtype); + + if (! IS_AGGR_TYPE (objtype)) + { + cp_error ("cannot apply member pointer `%E' to `%E'", component, datum); + cp_error ("which is of non-aggregate type `%T'", objtype); + return error_mark_node; + } + + binfo = get_binfo (TYPE_METHOD_BASETYPE (type), objtype, 1); + if (binfo == NULL_TREE) + { + cp_error ("member type `%T::' incompatible with object type `%T'", + TYPE_METHOD_BASETYPE (type), objtype); + return error_mark_node; + } + else if (binfo == error_mark_node) + return error_mark_node; + + return build (OFFSET_REF, rettype, datum, component); +} + +/* Return a tree node for the expression TYPENAME '(' PARMS ')'. + + Because we cannot tell whether this construct is really a call to a + constructor or a request for a type conversion, we try both, and + report any ambiguities we find. */ +tree +build_functional_cast (exp, parms) + tree exp; + tree parms; +{ + /* This is either a call to a constructor, + or a C cast in C++'s `functional' notation. */ + tree type, name = NULL_TREE; + tree expr_as_ctor = NULL_TREE; + + if (exp == error_mark_node || parms == error_mark_node) + return error_mark_node; + + if (TREE_CODE (exp) == IDENTIFIER_NODE) + { + name = exp; + + if (IDENTIFIER_HAS_TYPE_VALUE (exp)) + /* Either an enum or an aggregate type. */ + type = IDENTIFIER_TYPE_VALUE (exp); + else + { + type = lookup_name (exp, 1); + if (!type || TREE_CODE (type) != TYPE_DECL) + { + cp_error ("`%T' fails to be a typedef or built-in type", name); + return error_mark_node; + } + type = TREE_TYPE (type); + } + } + else + type = exp; + + if (IS_SIGNATURE (type)) + { + error ("signature type not allowed in cast or constructor expression"); + return error_mark_node; + } + + /* Prepare to evaluate as a call to a constructor. If this expression + is actually used, for example, + + return X (arg1, arg2, ...); + + then the slot being initialized will be filled in. */ + + if (name == NULL_TREE) + { + name = TYPE_NAME (type); + if (TREE_CODE (name) == TYPE_DECL) + name = DECL_NESTED_TYPENAME (name); + } + + if (! IS_AGGR_TYPE (type)) + { + /* this must build a C cast */ + if (parms == NULL_TREE) + parms = integer_zero_node; + else + { + if (TREE_CHAIN (parms) != NULL_TREE) + pedwarn ("initializer list being treated as compound expression"); + parms = build_compound_expr (parms); + } + + return build_c_cast (type, parms, 1); + } + + if (TYPE_SIZE (type) == NULL_TREE) + { + cp_error ("type `%T' is not yet defined", type); + return error_mark_node; + } + + if (parms && TREE_CHAIN (parms) == NULL_TREE) + return build_c_cast (type, parms, 1); + + expr_as_ctor = build_method_call (NULL_TREE, name, parms, + NULL_TREE, LOOKUP_NORMAL); + + if (expr_as_ctor == error_mark_node) + return error_mark_node; + + return build_cplus_new (type, expr_as_ctor, 1); +} + +/* Return the character string for the name that encodes the + enumeral value VALUE in the domain TYPE. */ +char * +enum_name_string (value, type) + tree value; + tree type; +{ + register tree values = TYPE_VALUES (type); + register HOST_WIDE_INT intval = TREE_INT_CST_LOW (value); + + my_friendly_assert (TREE_CODE (type) == ENUMERAL_TYPE, 324); + while (values + && TREE_INT_CST_LOW (TREE_VALUE (values)) != intval) + values = TREE_CHAIN (values); + if (values == NULL_TREE) + { + char *buf = (char *)oballoc (16 + TYPE_NAME_LENGTH (type)); + + /* Value must have been cast. */ + sprintf (buf, "(enum %s)%d", + TYPE_NAME_STRING (type), intval); + return buf; + } + return IDENTIFIER_POINTER (TREE_PURPOSE (values)); +} + +#if 0 +/* Print out a language-specific error message for + (Pascal) case or (C) switch statements. + CODE tells what sort of message to print. + TYPE is the type of the switch index expression. + NEW is the new value that we were trying to add. + OLD is the old value that stopped us from adding it. */ +void +report_case_error (code, type, new_value, old_value) + int code; + tree type; + tree new_value, old_value; +{ + if (code == 1) + { + if (new_value) + error ("case label not within a switch statement"); + else + error ("default label not within a switch statement"); + } + else if (code == 2) + { + if (new_value == 0) + { + error ("multiple default labels in one switch"); + return; + } + if (TREE_CODE (new_value) == RANGE_EXPR) + if (TREE_CODE (old_value) == RANGE_EXPR) + { + char *buf = (char *)alloca (4 * (8 + TYPE_NAME_LENGTH (type))); + if (TREE_CODE (type) == ENUMERAL_TYPE) + sprintf (buf, "overlapping ranges [%s..%s], [%s..%s] in case expression", + enum_name_string (TREE_OPERAND (new_value, 0), type), + enum_name_string (TREE_OPERAND (new_value, 1), type), + enum_name_string (TREE_OPERAND (old_value, 0), type), + enum_name_string (TREE_OPERAND (old_value, 1), type)); + else + sprintf (buf, "overlapping ranges [%d..%d], [%d..%d] in case expression", + TREE_INT_CST_LOW (TREE_OPERAND (new_value, 0)), + TREE_INT_CST_LOW (TREE_OPERAND (new_value, 1)), + TREE_INT_CST_LOW (TREE_OPERAND (old_value, 0)), + TREE_INT_CST_LOW (TREE_OPERAND (old_value, 1))); + error (buf); + } + else + { + char *buf = (char *)alloca (4 * (8 + TYPE_NAME_LENGTH (type))); + if (TREE_CODE (type) == ENUMERAL_TYPE) + sprintf (buf, "range [%s..%s] includes element `%s' in case expression", + enum_name_string (TREE_OPERAND (new_value, 0), type), + enum_name_string (TREE_OPERAND (new_value, 1), type), + enum_name_string (old_value, type)); + else + sprintf (buf, "range [%d..%d] includes (%d) in case expression", + TREE_INT_CST_LOW (TREE_OPERAND (new_value, 0)), + TREE_INT_CST_LOW (TREE_OPERAND (new_value, 1)), + TREE_INT_CST_LOW (old_value)); + error (buf); + } + else if (TREE_CODE (old_value) == RANGE_EXPR) + { + char *buf = (char *)alloca (4 * (8 + TYPE_NAME_LENGTH (type))); + if (TREE_CODE (type) == ENUMERAL_TYPE) + sprintf (buf, "range [%s..%s] includes element `%s' in case expression", + enum_name_string (TREE_OPERAND (old_value, 0), type), + enum_name_string (TREE_OPERAND (old_value, 1), type), + enum_name_string (new_value, type)); + else + sprintf (buf, "range [%d..%d] includes (%d) in case expression", + TREE_INT_CST_LOW (TREE_OPERAND (old_value, 0)), + TREE_INT_CST_LOW (TREE_OPERAND (old_value, 1)), + TREE_INT_CST_LOW (new_value)); + error (buf); + } + else + { + if (TREE_CODE (type) == ENUMERAL_TYPE) + error ("duplicate label `%s' in switch statement", + enum_name_string (new_value, type)); + else + error ("duplicate label (%d) in switch statement", + TREE_INT_CST_LOW (new_value)); + } + } + else if (code == 3) + { + if (TREE_CODE (type) == ENUMERAL_TYPE) + warning ("case value out of range for enum %s", + TYPE_NAME_STRING (type)); + else + warning ("case value out of range"); + } + else if (code == 4) + { + if (TREE_CODE (type) == ENUMERAL_TYPE) + error ("range values `%s' and `%s' reversed", + enum_name_string (new_value, type), + enum_name_string (old_value, type)); + else + error ("range values reversed"); + } +} +#endif |