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Diffstat (limited to 'gcc-4.2.1/gcc/c-parser.c')
| -rw-r--r-- | gcc-4.2.1/gcc/c-parser.c | 7868 |
1 files changed, 0 insertions, 7868 deletions
diff --git a/gcc-4.2.1/gcc/c-parser.c b/gcc-4.2.1/gcc/c-parser.c deleted file mode 100644 index c6be63918..000000000 --- a/gcc-4.2.1/gcc/c-parser.c +++ /dev/null @@ -1,7868 +0,0 @@ -/* Parser for C and Objective-C. - Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, - 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. - - Parser actions based on the old Bison parser; structure somewhat - influenced by and fragments based on the C++ parser. - -This file is part of GCC. - -GCC 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. - -GCC 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 GCC; see the file COPYING. If not, write to the Free -Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA -02110-1301, USA. */ - -/* TODO: - - Make sure all relevant comments, and all relevant code from all - actions, brought over from old parser. Verify exact correspondence - of syntax accepted. - - Add testcases covering every input symbol in every state in old and - new parsers. - - Include full syntax for GNU C, including erroneous cases accepted - with error messages, in syntax productions in comments. - - Make more diagnostics in the front end generally take an explicit - location rather than implicitly using input_location. */ - -#include "config.h" -#include "system.h" -#include "coretypes.h" -#include "tm.h" -#include "tree.h" -#include "rtl.h" -#include "langhooks.h" -#include "input.h" -#include "cpplib.h" -#include "timevar.h" -#include "c-pragma.h" -#include "c-tree.h" -#include "flags.h" -#include "output.h" -#include "toplev.h" -#include "ggc.h" -#include "c-common.h" -#include "vec.h" -#include "target.h" -#include "cgraph.h" - - -/* Miscellaneous data and functions needed for the parser. */ - -int yydebug; - -/* Objective-C specific parser/lexer information. */ - -static int objc_pq_context = 0; - -/* The following flag is needed to contextualize Objective-C lexical - analysis. In some cases (e.g., 'int NSObject;'), it is undesirable - to bind an identifier to an Objective-C class, even if a class with - that name exists. */ -static int objc_need_raw_identifier = 0; -#define OBJC_NEED_RAW_IDENTIFIER(VAL) \ - do { \ - if (c_dialect_objc ()) \ - objc_need_raw_identifier = VAL; \ - } while (0) - -/* The reserved keyword table. */ -struct resword -{ - const char *word; - ENUM_BITFIELD(rid) rid : 16; - unsigned int disable : 16; -}; - -/* Disable mask. Keywords are disabled if (reswords[i].disable & - mask) is _true_. */ -#define D_C89 0x01 /* not in C89 */ -#define D_EXT 0x02 /* GCC extension */ -#define D_EXT89 0x04 /* GCC extension incorporated in C99 */ -#define D_OBJC 0x08 /* Objective C only */ - -static const struct resword reswords[] = -{ - { "_Bool", RID_BOOL, 0 }, - { "_Complex", RID_COMPLEX, 0 }, - { "_Decimal32", RID_DFLOAT32, D_EXT }, - { "_Decimal64", RID_DFLOAT64, D_EXT }, - { "_Decimal128", RID_DFLOAT128, D_EXT }, - { "__FUNCTION__", RID_FUNCTION_NAME, 0 }, - { "__PRETTY_FUNCTION__", RID_PRETTY_FUNCTION_NAME, 0 }, - { "__alignof", RID_ALIGNOF, 0 }, - { "__alignof__", RID_ALIGNOF, 0 }, - { "__asm", RID_ASM, 0 }, - { "__asm__", RID_ASM, 0 }, - { "__attribute", RID_ATTRIBUTE, 0 }, - { "__attribute__", RID_ATTRIBUTE, 0 }, - { "__builtin_choose_expr", RID_CHOOSE_EXPR, 0 }, - { "__builtin_offsetof", RID_OFFSETOF, 0 }, - { "__builtin_types_compatible_p", RID_TYPES_COMPATIBLE_P, 0 }, - { "__builtin_va_arg", RID_VA_ARG, 0 }, - { "__complex", RID_COMPLEX, 0 }, - { "__complex__", RID_COMPLEX, 0 }, - { "__const", RID_CONST, 0 }, - { "__const__", RID_CONST, 0 }, - { "__extension__", RID_EXTENSION, 0 }, - { "__func__", RID_C99_FUNCTION_NAME, 0 }, - { "__imag", RID_IMAGPART, 0 }, - { "__imag__", RID_IMAGPART, 0 }, - { "__inline", RID_INLINE, 0 }, - { "__inline__", RID_INLINE, 0 }, - { "__label__", RID_LABEL, 0 }, - { "__real", RID_REALPART, 0 }, - { "__real__", RID_REALPART, 0 }, - { "__restrict", RID_RESTRICT, 0 }, - { "__restrict__", RID_RESTRICT, 0 }, - { "__signed", RID_SIGNED, 0 }, - { "__signed__", RID_SIGNED, 0 }, - { "__thread", RID_THREAD, 0 }, - { "__typeof", RID_TYPEOF, 0 }, - { "__typeof__", RID_TYPEOF, 0 }, - { "__volatile", RID_VOLATILE, 0 }, - { "__volatile__", RID_VOLATILE, 0 }, - { "asm", RID_ASM, D_EXT }, - { "auto", RID_AUTO, 0 }, - { "break", RID_BREAK, 0 }, - { "case", RID_CASE, 0 }, - { "char", RID_CHAR, 0 }, - { "const", RID_CONST, 0 }, - { "continue", RID_CONTINUE, 0 }, - { "default", RID_DEFAULT, 0 }, - { "do", RID_DO, 0 }, - { "double", RID_DOUBLE, 0 }, - { "else", RID_ELSE, 0 }, - { "enum", RID_ENUM, 0 }, - { "extern", RID_EXTERN, 0 }, - { "float", RID_FLOAT, 0 }, - { "for", RID_FOR, 0 }, - { "goto", RID_GOTO, 0 }, - { "if", RID_IF, 0 }, - { "inline", RID_INLINE, D_EXT89 }, - { "int", RID_INT, 0 }, - { "long", RID_LONG, 0 }, - { "register", RID_REGISTER, 0 }, - { "restrict", RID_RESTRICT, D_C89 }, - { "return", RID_RETURN, 0 }, - { "short", RID_SHORT, 0 }, - { "signed", RID_SIGNED, 0 }, - { "sizeof", RID_SIZEOF, 0 }, - { "static", RID_STATIC, 0 }, - { "struct", RID_STRUCT, 0 }, - { "switch", RID_SWITCH, 0 }, - { "typedef", RID_TYPEDEF, 0 }, - { "typeof", RID_TYPEOF, D_EXT }, - { "union", RID_UNION, 0 }, - { "unsigned", RID_UNSIGNED, 0 }, - { "void", RID_VOID, 0 }, - { "volatile", RID_VOLATILE, 0 }, - { "while", RID_WHILE, 0 }, - /* These Objective-C keywords are recognized only immediately after - an '@'. */ - { "class", RID_AT_CLASS, D_OBJC }, - { "compatibility_alias", RID_AT_ALIAS, D_OBJC }, - { "defs", RID_AT_DEFS, D_OBJC }, - { "encode", RID_AT_ENCODE, D_OBJC }, - { "end", RID_AT_END, D_OBJC }, - { "implementation", RID_AT_IMPLEMENTATION, D_OBJC }, - { "interface", RID_AT_INTERFACE, D_OBJC }, - { "private", RID_AT_PRIVATE, D_OBJC }, - { "protected", RID_AT_PROTECTED, D_OBJC }, - { "protocol", RID_AT_PROTOCOL, D_OBJC }, - { "public", RID_AT_PUBLIC, D_OBJC }, - { "selector", RID_AT_SELECTOR, D_OBJC }, - { "throw", RID_AT_THROW, D_OBJC }, - { "try", RID_AT_TRY, D_OBJC }, - { "catch", RID_AT_CATCH, D_OBJC }, - { "finally", RID_AT_FINALLY, D_OBJC }, - { "synchronized", RID_AT_SYNCHRONIZED, D_OBJC }, - /* These are recognized only in protocol-qualifier context - (see above) */ - { "bycopy", RID_BYCOPY, D_OBJC }, - { "byref", RID_BYREF, D_OBJC }, - { "in", RID_IN, D_OBJC }, - { "inout", RID_INOUT, D_OBJC }, - { "oneway", RID_ONEWAY, D_OBJC }, - { "out", RID_OUT, D_OBJC }, -}; -#define N_reswords (sizeof reswords / sizeof (struct resword)) - -/* All OpenMP clauses. OpenMP 2.5. */ -typedef enum pragma_omp_clause { - PRAGMA_OMP_CLAUSE_NONE = 0, - - PRAGMA_OMP_CLAUSE_COPYIN, - PRAGMA_OMP_CLAUSE_COPYPRIVATE, - PRAGMA_OMP_CLAUSE_DEFAULT, - PRAGMA_OMP_CLAUSE_FIRSTPRIVATE, - PRAGMA_OMP_CLAUSE_IF, - PRAGMA_OMP_CLAUSE_LASTPRIVATE, - PRAGMA_OMP_CLAUSE_NOWAIT, - PRAGMA_OMP_CLAUSE_NUM_THREADS, - PRAGMA_OMP_CLAUSE_ORDERED, - PRAGMA_OMP_CLAUSE_PRIVATE, - PRAGMA_OMP_CLAUSE_REDUCTION, - PRAGMA_OMP_CLAUSE_SCHEDULE, - PRAGMA_OMP_CLAUSE_SHARED -} pragma_omp_clause; - - -/* Initialization routine for this file. */ - -void -c_parse_init (void) -{ - /* The only initialization required is of the reserved word - identifiers. */ - unsigned int i; - tree id; - int mask = (flag_isoc99 ? 0 : D_C89) - | (flag_no_asm ? (flag_isoc99 ? D_EXT : D_EXT|D_EXT89) : 0); - - if (!c_dialect_objc ()) - mask |= D_OBJC; - - ridpointers = GGC_CNEWVEC (tree, (int) RID_MAX); - for (i = 0; i < N_reswords; i++) - { - /* If a keyword is disabled, do not enter it into the table - and so create a canonical spelling that isn't a keyword. */ - if (reswords[i].disable & mask) - continue; - - id = get_identifier (reswords[i].word); - C_RID_CODE (id) = reswords[i].rid; - C_IS_RESERVED_WORD (id) = 1; - ridpointers [(int) reswords[i].rid] = id; - } -} - -/* The C lexer intermediates between the lexer in cpplib and c-lex.c - and the C parser. Unlike the C++ lexer, the parser structure - stores the lexer information instead of using a separate structure. - Identifiers are separated into ordinary identifiers, type names, - keywords and some other Objective-C types of identifiers, and some - look-ahead is maintained. - - ??? It might be a good idea to lex the whole file up front (as for - C++). It would then be possible to share more of the C and C++ - lexer code, if desired. */ - -/* The following local token type is used. */ - -/* A keyword. */ -#define CPP_KEYWORD ((enum cpp_ttype) (N_TTYPES + 1)) - -/* More information about the type of a CPP_NAME token. */ -typedef enum c_id_kind { - /* An ordinary identifier. */ - C_ID_ID, - /* An identifier declared as a typedef name. */ - C_ID_TYPENAME, - /* An identifier declared as an Objective-C class name. */ - C_ID_CLASSNAME, - /* Not an identifier. */ - C_ID_NONE -} c_id_kind; - -/* A single C token after string literal concatenation and conversion - of preprocessing tokens to tokens. */ -typedef struct c_token GTY (()) -{ - /* The kind of token. */ - ENUM_BITFIELD (cpp_ttype) type : 8; - /* If this token is a CPP_NAME, this value indicates whether also - declared as some kind of type. Otherwise, it is C_ID_NONE. */ - ENUM_BITFIELD (c_id_kind) id_kind : 8; - /* If this token is a keyword, this value indicates which keyword. - Otherwise, this value is RID_MAX. */ - ENUM_BITFIELD (rid) keyword : 8; - /* If this token is a CPP_PRAGMA, this indicates the pragma that - was seen. Otherwise it is PRAGMA_NONE. */ - ENUM_BITFIELD (pragma_kind) pragma_kind : 7; - /* True if this token is from a system header. */ - BOOL_BITFIELD in_system_header : 1; - /* The value associated with this token, if any. */ - tree value; - /* The location at which this token was found. */ - location_t location; -} c_token; - -/* A parser structure recording information about the state and - context of parsing. Includes lexer information with up to two - tokens of look-ahead; more are not needed for C. */ -typedef struct c_parser GTY(()) -{ - /* The look-ahead tokens. */ - c_token tokens[2]; - /* How many look-ahead tokens are available (0, 1 or 2). */ - short tokens_avail; - /* True if a syntax error is being recovered from; false otherwise. - c_parser_error sets this flag. It should clear this flag when - enough tokens have been consumed to recover from the error. */ - BOOL_BITFIELD error : 1; - /* True if we're processing a pragma, and shouldn't automatically - consume CPP_PRAGMA_EOL. */ - BOOL_BITFIELD in_pragma : 1; -} c_parser; - - -/* The actual parser and external interface. ??? Does this need to be - garbage-collected? */ - -static GTY (()) c_parser *the_parser; - - -/* Read in and lex a single token, storing it in *TOKEN. */ - -static void -c_lex_one_token (c_token *token) -{ - timevar_push (TV_LEX); - - token->type = c_lex_with_flags (&token->value, &token->location, NULL); - token->id_kind = C_ID_NONE; - token->keyword = RID_MAX; - token->pragma_kind = PRAGMA_NONE; - token->in_system_header = in_system_header; - - switch (token->type) - { - case CPP_NAME: - { - tree decl; - - int objc_force_identifier = objc_need_raw_identifier; - OBJC_NEED_RAW_IDENTIFIER (0); - - if (C_IS_RESERVED_WORD (token->value)) - { - enum rid rid_code = C_RID_CODE (token->value); - - if (c_dialect_objc ()) - { - if (!OBJC_IS_AT_KEYWORD (rid_code) - && (!OBJC_IS_PQ_KEYWORD (rid_code) || objc_pq_context)) - { - /* Return the canonical spelling for this keyword. */ - token->value = ridpointers[(int) rid_code]; - token->type = CPP_KEYWORD; - token->keyword = rid_code; - break; - } - } - else - { - /* Return the canonical spelling for this keyword. */ - token->value = ridpointers[(int) rid_code]; - token->type = CPP_KEYWORD; - token->keyword = rid_code; - break; - } - } - - decl = lookup_name (token->value); - if (decl) - { - if (TREE_CODE (decl) == TYPE_DECL) - { - token->id_kind = C_ID_TYPENAME; - break; - } - } - else if (c_dialect_objc ()) - { - tree objc_interface_decl = objc_is_class_name (token->value); - /* Objective-C class names are in the same namespace as - variables and typedefs, and hence are shadowed by local - declarations. */ - if (objc_interface_decl - && (global_bindings_p () - || (!objc_force_identifier && !decl))) - { - token->value = objc_interface_decl; - token->id_kind = C_ID_CLASSNAME; - break; - } - } - token->id_kind = C_ID_ID; - } - break; - case CPP_AT_NAME: - /* This only happens in Objective-C; it must be a keyword. */ - token->type = CPP_KEYWORD; - token->keyword = C_RID_CODE (token->value); - break; - case CPP_COLON: - case CPP_COMMA: - case CPP_CLOSE_PAREN: - case CPP_SEMICOLON: - /* These tokens may affect the interpretation of any identifiers - following, if doing Objective-C. */ - OBJC_NEED_RAW_IDENTIFIER (0); - break; - case CPP_PRAGMA: - /* We smuggled the cpp_token->u.pragma value in an INTEGER_CST. */ - token->pragma_kind = TREE_INT_CST_LOW (token->value); - token->value = NULL; - break; - default: - break; - } - timevar_pop (TV_LEX); -} - -/* Return a pointer to the next token from PARSER, reading it in if - necessary. */ - -static inline c_token * -c_parser_peek_token (c_parser *parser) -{ - if (parser->tokens_avail == 0) - { - c_lex_one_token (&parser->tokens[0]); - parser->tokens_avail = 1; - } - return &parser->tokens[0]; -} - -/* Return true if the next token from PARSER has the indicated - TYPE. */ - -static inline bool -c_parser_next_token_is (c_parser *parser, enum cpp_ttype type) -{ - return c_parser_peek_token (parser)->type == type; -} - -/* Return true if the next token from PARSER does not have the - indicated TYPE. */ - -static inline bool -c_parser_next_token_is_not (c_parser *parser, enum cpp_ttype type) -{ - return !c_parser_next_token_is (parser, type); -} - -/* Return true if the next token from PARSER is the indicated - KEYWORD. */ - -static inline bool -c_parser_next_token_is_keyword (c_parser *parser, enum rid keyword) -{ - c_token *token; - - /* Peek at the next token. */ - token = c_parser_peek_token (parser); - /* Check to see if it is the indicated keyword. */ - return token->keyword == keyword; -} - -/* Return true if TOKEN can start a type name, - false otherwise. */ -static bool -c_token_starts_typename (c_token *token) -{ - switch (token->type) - { - case CPP_NAME: - switch (token->id_kind) - { - case C_ID_ID: - return false; - case C_ID_TYPENAME: - return true; - case C_ID_CLASSNAME: - gcc_assert (c_dialect_objc ()); - return true; - default: - gcc_unreachable (); - } - case CPP_KEYWORD: - switch (token->keyword) - { - case RID_UNSIGNED: - case RID_LONG: - case RID_SHORT: - case RID_SIGNED: - case RID_COMPLEX: - case RID_INT: - case RID_CHAR: - case RID_FLOAT: - case RID_DOUBLE: - case RID_VOID: - case RID_DFLOAT32: - case RID_DFLOAT64: - case RID_DFLOAT128: - case RID_BOOL: - case RID_ENUM: - case RID_STRUCT: - case RID_UNION: - case RID_TYPEOF: - case RID_CONST: - case RID_VOLATILE: - case RID_RESTRICT: - case RID_ATTRIBUTE: - return true; - default: - return false; - } - case CPP_LESS: - if (c_dialect_objc ()) - return true; - return false; - default: - return false; - } -} - -/* Return true if the next token from PARSER can start a type name, - false otherwise. */ -static inline bool -c_parser_next_token_starts_typename (c_parser *parser) -{ - c_token *token = c_parser_peek_token (parser); - return c_token_starts_typename (token); -} - -/* Return true if TOKEN can start declaration specifiers, false - otherwise. */ -static bool -c_token_starts_declspecs (c_token *token) -{ - switch (token->type) - { - case CPP_NAME: - switch (token->id_kind) - { - case C_ID_ID: - return false; - case C_ID_TYPENAME: - return true; - case C_ID_CLASSNAME: - gcc_assert (c_dialect_objc ()); - return true; - default: - gcc_unreachable (); - } - case CPP_KEYWORD: - switch (token->keyword) - { - case RID_STATIC: - case RID_EXTERN: - case RID_REGISTER: - case RID_TYPEDEF: - case RID_INLINE: - case RID_AUTO: - case RID_THREAD: - case RID_UNSIGNED: - case RID_LONG: - case RID_SHORT: - case RID_SIGNED: - case RID_COMPLEX: - case RID_INT: - case RID_CHAR: - case RID_FLOAT: - case RID_DOUBLE: - case RID_VOID: - case RID_DFLOAT32: - case RID_DFLOAT64: - case RID_DFLOAT128: - case RID_BOOL: - case RID_ENUM: - case RID_STRUCT: - case RID_UNION: - case RID_TYPEOF: - case RID_CONST: - case RID_VOLATILE: - case RID_RESTRICT: - case RID_ATTRIBUTE: - return true; - default: - return false; - } - case CPP_LESS: - if (c_dialect_objc ()) - return true; - return false; - default: - return false; - } -} - -/* Return true if the next token from PARSER can start declaration - specifiers, false otherwise. */ -static inline bool -c_parser_next_token_starts_declspecs (c_parser *parser) -{ - c_token *token = c_parser_peek_token (parser); - return c_token_starts_declspecs (token); -} - -/* Return a pointer to the next-but-one token from PARSER, reading it - in if necessary. The next token is already read in. */ - -static c_token * -c_parser_peek_2nd_token (c_parser *parser) -{ - if (parser->tokens_avail >= 2) - return &parser->tokens[1]; - gcc_assert (parser->tokens_avail == 1); - gcc_assert (parser->tokens[0].type != CPP_EOF); - gcc_assert (parser->tokens[0].type != CPP_PRAGMA_EOL); - c_lex_one_token (&parser->tokens[1]); - parser->tokens_avail = 2; - return &parser->tokens[1]; -} - -/* Consume the next token from PARSER. */ - -static void -c_parser_consume_token (c_parser *parser) -{ - gcc_assert (parser->tokens_avail >= 1); - gcc_assert (parser->tokens[0].type != CPP_EOF); - gcc_assert (!parser->in_pragma || parser->tokens[0].type != CPP_PRAGMA_EOL); - gcc_assert (parser->error || parser->tokens[0].type != CPP_PRAGMA); - if (parser->tokens_avail == 2) - parser->tokens[0] = parser->tokens[1]; - parser->tokens_avail--; -} - -/* Expect the current token to be a #pragma. Consume it and remember - that we've begun parsing a pragma. */ - -static void -c_parser_consume_pragma (c_parser *parser) -{ - gcc_assert (!parser->in_pragma); - gcc_assert (parser->tokens_avail >= 1); - gcc_assert (parser->tokens[0].type == CPP_PRAGMA); - if (parser->tokens_avail == 2) - parser->tokens[0] = parser->tokens[1]; - parser->tokens_avail--; - parser->in_pragma = true; -} - -/* Update the globals input_location and in_system_header from - TOKEN. */ -static inline void -c_parser_set_source_position_from_token (c_token *token) -{ - if (token->type != CPP_EOF) - { - input_location = token->location; - in_system_header = token->in_system_header; - } -} - -/* Issue a diagnostic of the form - FILE:LINE: MESSAGE before TOKEN - where TOKEN is the next token in the input stream of PARSER. - MESSAGE (specified by the caller) is usually of the form "expected - OTHER-TOKEN". - - Do not issue a diagnostic if still recovering from an error. - - ??? This is taken from the C++ parser, but building up messages in - this way is not i18n-friendly and some other approach should be - used. */ - -static void -c_parser_error (c_parser *parser, const char *gmsgid) -{ - c_token *token = c_parser_peek_token (parser); - if (parser->error) - return; - parser->error = true; - if (!gmsgid) - return; - /* This diagnostic makes more sense if it is tagged to the line of - the token we just peeked at. */ - c_parser_set_source_position_from_token (token); - c_parse_error (gmsgid, - /* Because c_parse_error does not understand - CPP_KEYWORD, keywords are treated like - identifiers. */ - (token->type == CPP_KEYWORD ? CPP_NAME : token->type), - token->value); -} - -/* If the next token is of the indicated TYPE, consume it. Otherwise, - issue the error MSGID. If MSGID is NULL then a message has already - been produced and no message will be produced this time. Returns - true if found, false otherwise. */ - -static bool -c_parser_require (c_parser *parser, - enum cpp_ttype type, - const char *msgid) -{ - if (c_parser_next_token_is (parser, type)) - { - c_parser_consume_token (parser); - return true; - } - else - { - c_parser_error (parser, msgid); - return false; - } -} - -/* If the next token is the indicated keyword, consume it. Otherwise, - issue the error MSGID. Returns true if found, false otherwise. */ - -static bool -c_parser_require_keyword (c_parser *parser, - enum rid keyword, - const char *msgid) -{ - if (c_parser_next_token_is_keyword (parser, keyword)) - { - c_parser_consume_token (parser); - return true; - } - else - { - c_parser_error (parser, msgid); - return false; - } -} - -/* Like c_parser_require, except that tokens will be skipped until the - desired token is found. An error message is still produced if the - next token is not as expected. If MSGID is NULL then a message has - already been produced and no message will be produced this - time. */ - -static void -c_parser_skip_until_found (c_parser *parser, - enum cpp_ttype type, - const char *msgid) -{ - unsigned nesting_depth = 0; - - if (c_parser_require (parser, type, msgid)) - return; - - /* Skip tokens until the desired token is found. */ - while (true) - { - /* Peek at the next token. */ - c_token *token = c_parser_peek_token (parser); - /* If we've reached the token we want, consume it and stop. */ - if (token->type == type && !nesting_depth) - { - c_parser_consume_token (parser); - break; - } - - /* If we've run out of tokens, stop. */ - if (token->type == CPP_EOF) - return; - if (token->type == CPP_PRAGMA_EOL && parser->in_pragma) - return; - if (token->type == CPP_OPEN_BRACE - || token->type == CPP_OPEN_PAREN - || token->type == CPP_OPEN_SQUARE) - ++nesting_depth; - else if (token->type == CPP_CLOSE_BRACE - || token->type == CPP_CLOSE_PAREN - || token->type == CPP_CLOSE_SQUARE) - { - if (nesting_depth-- == 0) - break; - } - /* Consume this token. */ - c_parser_consume_token (parser); - } - parser->error = false; -} - -/* Skip tokens until the end of a parameter is found, but do not - consume the comma, semicolon or closing delimiter. */ - -static void -c_parser_skip_to_end_of_parameter (c_parser *parser) -{ - unsigned nesting_depth = 0; - - while (true) - { - c_token *token = c_parser_peek_token (parser); - if ((token->type == CPP_COMMA || token->type == CPP_SEMICOLON) - && !nesting_depth) - break; - /* If we've run out of tokens, stop. */ - if (token->type == CPP_EOF) - return; - if (token->type == CPP_PRAGMA_EOL && parser->in_pragma) - return; - if (token->type == CPP_OPEN_BRACE - || token->type == CPP_OPEN_PAREN - || token->type == CPP_OPEN_SQUARE) - ++nesting_depth; - else if (token->type == CPP_CLOSE_BRACE - || token->type == CPP_CLOSE_PAREN - || token->type == CPP_CLOSE_SQUARE) - { - if (nesting_depth-- == 0) - break; - } - /* Consume this token. */ - c_parser_consume_token (parser); - } - parser->error = false; -} - -/* Expect to be at the end of the pragma directive and consume an - end of line marker. */ - -static void -c_parser_skip_to_pragma_eol (c_parser *parser) -{ - gcc_assert (parser->in_pragma); - parser->in_pragma = false; - - if (!c_parser_require (parser, CPP_PRAGMA_EOL, "expected end of line")) - while (true) - { - c_token *token = c_parser_peek_token (parser); - if (token->type == CPP_EOF) - break; - if (token->type == CPP_PRAGMA_EOL) - { - c_parser_consume_token (parser); - break; - } - c_parser_consume_token (parser); - } - - parser->error = false; -} - -/* Skip tokens until we have consumed an entire block, or until we - have consumed a non-nested ';'. */ - -static void -c_parser_skip_to_end_of_block_or_statement (c_parser *parser) -{ - unsigned nesting_depth = 0; - bool save_error = parser->error; - - while (true) - { - c_token *token; - - /* Peek at the next token. */ - token = c_parser_peek_token (parser); - - switch (token->type) - { - case CPP_EOF: - return; - - case CPP_PRAGMA_EOL: - if (parser->in_pragma) - return; - break; - - case CPP_SEMICOLON: - /* If the next token is a ';', we have reached the - end of the statement. */ - if (!nesting_depth) - { - /* Consume the ';'. */ - c_parser_consume_token (parser); - goto finished; - } - break; - - case CPP_CLOSE_BRACE: - /* If the next token is a non-nested '}', then we have - reached the end of the current block. */ - if (nesting_depth == 0 || --nesting_depth == 0) - { - c_parser_consume_token (parser); - goto finished; - } - break; - - case CPP_OPEN_BRACE: - /* If it the next token is a '{', then we are entering a new - block. Consume the entire block. */ - ++nesting_depth; - break; - - case CPP_PRAGMA: - /* If we see a pragma, consume the whole thing at once. We - have some safeguards against consuming pragmas willy-nilly. - Normally, we'd expect to be here with parser->error set, - which disables these safeguards. But it's possible to get - here for secondary error recovery, after parser->error has - been cleared. */ - c_parser_consume_pragma (parser); - c_parser_skip_to_pragma_eol (parser); - parser->error = save_error; - continue; - - default: - break; - } - - c_parser_consume_token (parser); - } - - finished: - parser->error = false; -} - -/* Save the warning flags which are controlled by __extension__. */ - -static inline int -disable_extension_diagnostics (void) -{ - int ret = (pedantic - | (warn_pointer_arith << 1) - | (warn_traditional << 2) - | (flag_iso << 3)); - pedantic = 0; - warn_pointer_arith = 0; - warn_traditional = 0; - flag_iso = 0; - return ret; -} - -/* Restore the warning flags which are controlled by __extension__. - FLAGS is the return value from disable_extension_diagnostics. */ - -static inline void -restore_extension_diagnostics (int flags) -{ - pedantic = flags & 1; - warn_pointer_arith = (flags >> 1) & 1; - warn_traditional = (flags >> 2) & 1; - flag_iso = (flags >> 3) & 1; -} - -/* Possibly kinds of declarator to parse. */ -typedef enum c_dtr_syn { - /* A normal declarator with an identifier. */ - C_DTR_NORMAL, - /* An abstract declarator (maybe empty). */ - C_DTR_ABSTRACT, - /* A parameter declarator: may be either, but after a type name does - not redeclare a typedef name as an identifier if it can - alternatively be interpreted as a typedef name; see DR#009, - applied in C90 TC1, omitted from C99 and reapplied in C99 TC2 - following DR#249. For example, given a typedef T, "int T" and - "int *T" are valid parameter declarations redeclaring T, while - "int (T)" and "int * (T)" and "int (T[])" and "int (T (int))" are - abstract declarators rather than involving redundant parentheses; - the same applies with attributes inside the parentheses before - "T". */ - C_DTR_PARM -} c_dtr_syn; - -static void c_parser_external_declaration (c_parser *); -static void c_parser_asm_definition (c_parser *); -static void c_parser_declaration_or_fndef (c_parser *, bool, bool, bool, bool); -static void c_parser_declspecs (c_parser *, struct c_declspecs *, bool, bool, - bool); -static struct c_typespec c_parser_enum_specifier (c_parser *); -static struct c_typespec c_parser_struct_or_union_specifier (c_parser *); -static tree c_parser_struct_declaration (c_parser *); -static struct c_typespec c_parser_typeof_specifier (c_parser *); -static struct c_declarator *c_parser_declarator (c_parser *, bool, c_dtr_syn, - bool *); -static struct c_declarator *c_parser_direct_declarator (c_parser *, bool, - c_dtr_syn, bool *); -static struct c_declarator *c_parser_direct_declarator_inner (c_parser *, - bool, - struct c_declarator *); -static struct c_arg_info *c_parser_parms_declarator (c_parser *, bool, tree); -static struct c_arg_info *c_parser_parms_list_declarator (c_parser *, tree); -static struct c_parm *c_parser_parameter_declaration (c_parser *, tree); -static tree c_parser_simple_asm_expr (c_parser *); -static tree c_parser_attributes (c_parser *); -static struct c_type_name *c_parser_type_name (c_parser *); -static struct c_expr c_parser_initializer (c_parser *); -static struct c_expr c_parser_braced_init (c_parser *, tree, bool); -static void c_parser_initelt (c_parser *); -static void c_parser_initval (c_parser *, struct c_expr *); -static tree c_parser_compound_statement (c_parser *); -static void c_parser_compound_statement_nostart (c_parser *); -static void c_parser_label (c_parser *); -static void c_parser_statement (c_parser *); -static void c_parser_statement_after_labels (c_parser *); -static void c_parser_if_statement (c_parser *); -static void c_parser_switch_statement (c_parser *); -static void c_parser_while_statement (c_parser *); -static void c_parser_do_statement (c_parser *); -static void c_parser_for_statement (c_parser *); -static tree c_parser_asm_statement (c_parser *); -static tree c_parser_asm_operands (c_parser *, bool); -static tree c_parser_asm_clobbers (c_parser *); -static struct c_expr c_parser_expr_no_commas (c_parser *, struct c_expr *); -static struct c_expr c_parser_conditional_expression (c_parser *, - struct c_expr *); -static struct c_expr c_parser_binary_expression (c_parser *, struct c_expr *); -static struct c_expr c_parser_cast_expression (c_parser *, struct c_expr *); -static struct c_expr c_parser_unary_expression (c_parser *); -static struct c_expr c_parser_sizeof_expression (c_parser *); -static struct c_expr c_parser_alignof_expression (c_parser *); -static struct c_expr c_parser_postfix_expression (c_parser *); -static struct c_expr c_parser_postfix_expression_after_paren_type (c_parser *, - struct c_type_name *); -static struct c_expr c_parser_postfix_expression_after_primary (c_parser *, - struct c_expr); -static struct c_expr c_parser_expression (c_parser *); -static struct c_expr c_parser_expression_conv (c_parser *); -static tree c_parser_expr_list (c_parser *, bool); -static void c_parser_omp_construct (c_parser *); -static void c_parser_omp_threadprivate (c_parser *); -static void c_parser_omp_barrier (c_parser *); -static void c_parser_omp_flush (c_parser *); - -enum pragma_context { pragma_external, pragma_stmt, pragma_compound }; -static bool c_parser_pragma (c_parser *, enum pragma_context); - -/* These Objective-C parser functions are only ever called when - compiling Objective-C. */ -static void c_parser_objc_class_definition (c_parser *); -static void c_parser_objc_class_instance_variables (c_parser *); -static void c_parser_objc_class_declaration (c_parser *); -static void c_parser_objc_alias_declaration (c_parser *); -static void c_parser_objc_protocol_definition (c_parser *); -static enum tree_code c_parser_objc_method_type (c_parser *); -static void c_parser_objc_method_definition (c_parser *); -static void c_parser_objc_methodprotolist (c_parser *); -static void c_parser_objc_methodproto (c_parser *); -static tree c_parser_objc_method_decl (c_parser *); -static tree c_parser_objc_type_name (c_parser *); -static tree c_parser_objc_protocol_refs (c_parser *); -static void c_parser_objc_try_catch_statement (c_parser *); -static void c_parser_objc_synchronized_statement (c_parser *); -static tree c_parser_objc_selector (c_parser *); -static tree c_parser_objc_selector_arg (c_parser *); -static tree c_parser_objc_receiver (c_parser *); -static tree c_parser_objc_message_args (c_parser *); -static tree c_parser_objc_keywordexpr (c_parser *); - -/* Parse a translation unit (C90 6.7, C99 6.9). - - translation-unit: - external-declarations - - external-declarations: - external-declaration - external-declarations external-declaration - - GNU extensions: - - translation-unit: - empty -*/ - -static void -c_parser_translation_unit (c_parser *parser) -{ - if (c_parser_next_token_is (parser, CPP_EOF)) - { - if (pedantic) - pedwarn ("ISO C forbids an empty source file"); - } - else - { - void *obstack_position = obstack_alloc (&parser_obstack, 0); - do - { - ggc_collect (); - c_parser_external_declaration (parser); - obstack_free (&parser_obstack, obstack_position); - } - while (c_parser_next_token_is_not (parser, CPP_EOF)); - } -} - -/* Parse an external declaration (C90 6.7, C99 6.9). - - external-declaration: - function-definition - declaration - - GNU extensions: - - external-declaration: - asm-definition - ; - __extension__ external-declaration - - Objective-C: - - external-declaration: - objc-class-definition - objc-class-declaration - objc-alias-declaration - objc-protocol-definition - objc-method-definition - @end -*/ - -static void -c_parser_external_declaration (c_parser *parser) -{ - int ext; - switch (c_parser_peek_token (parser)->type) - { - case CPP_KEYWORD: - switch (c_parser_peek_token (parser)->keyword) - { - case RID_EXTENSION: - ext = disable_extension_diagnostics (); - c_parser_consume_token (parser); - c_parser_external_declaration (parser); - restore_extension_diagnostics (ext); - break; - case RID_ASM: - c_parser_asm_definition (parser); - break; - case RID_AT_INTERFACE: - case RID_AT_IMPLEMENTATION: - gcc_assert (c_dialect_objc ()); - c_parser_objc_class_definition (parser); - break; - case RID_AT_CLASS: - gcc_assert (c_dialect_objc ()); - c_parser_objc_class_declaration (parser); - break; - case RID_AT_ALIAS: - gcc_assert (c_dialect_objc ()); - c_parser_objc_alias_declaration (parser); - break; - case RID_AT_PROTOCOL: - gcc_assert (c_dialect_objc ()); - c_parser_objc_protocol_definition (parser); - break; - case RID_AT_END: - gcc_assert (c_dialect_objc ()); - c_parser_consume_token (parser); - objc_finish_implementation (); - break; - default: - goto decl_or_fndef; - } - break; - case CPP_SEMICOLON: - if (pedantic) - pedwarn ("ISO C does not allow extra %<;%> outside of a function"); - c_parser_consume_token (parser); - break; - case CPP_PRAGMA: - c_parser_pragma (parser, pragma_external); - break; - case CPP_PLUS: - case CPP_MINUS: - if (c_dialect_objc ()) - { - c_parser_objc_method_definition (parser); - break; - } - /* Else fall through, and yield a syntax error trying to parse - as a declaration or function definition. */ - default: - decl_or_fndef: - /* A declaration or a function definition. We can only tell - which after parsing the declaration specifiers, if any, and - the first declarator. */ - c_parser_declaration_or_fndef (parser, true, true, false, true); - break; - } -} - - -/* Parse a declaration or function definition (C90 6.5, 6.7.1, C99 - 6.7, 6.9.1). If FNDEF_OK is true, a function definition is - accepted; otherwise (old-style parameter declarations) only other - declarations are accepted. If NESTED is true, we are inside a - function or parsing old-style parameter declarations; any functions - encountered are nested functions and declaration specifiers are - required; otherwise we are at top level and functions are normal - functions and declaration specifiers may be optional. If EMPTY_OK - is true, empty declarations are OK (subject to all other - constraints); otherwise (old-style parameter declarations) they are - diagnosed. If START_ATTR_OK is true, the declaration specifiers - may start with attributes; otherwise they may not. - - declaration: - declaration-specifiers init-declarator-list[opt] ; - - function-definition: - declaration-specifiers[opt] declarator declaration-list[opt] - compound-statement - - declaration-list: - declaration - declaration-list declaration - - init-declarator-list: - init-declarator - init-declarator-list , init-declarator - - init-declarator: - declarator simple-asm-expr[opt] attributes[opt] - declarator simple-asm-expr[opt] attributes[opt] = initializer - - GNU extensions: - - nested-function-definition: - declaration-specifiers declarator declaration-list[opt] - compound-statement - - The simple-asm-expr and attributes are GNU extensions. - - This function does not handle __extension__; that is handled in its - callers. ??? Following the old parser, __extension__ may start - external declarations, declarations in functions and declarations - at the start of "for" loops, but not old-style parameter - declarations. - - C99 requires declaration specifiers in a function definition; the - absence is diagnosed through the diagnosis of implicit int. In GNU - C we also allow but diagnose declarations without declaration - specifiers, but only at top level (elsewhere they conflict with - other syntax). - - OpenMP: - - declaration: - threadprivate-directive */ - -static void -c_parser_declaration_or_fndef (c_parser *parser, bool fndef_ok, bool empty_ok, - bool nested, bool start_attr_ok) -{ - struct c_declspecs *specs; - tree prefix_attrs; - tree all_prefix_attrs; - bool diagnosed_no_specs = false; - - specs = build_null_declspecs (); - c_parser_declspecs (parser, specs, true, true, start_attr_ok); - if (parser->error) - { - c_parser_skip_to_end_of_block_or_statement (parser); - return; - } - if (nested && !specs->declspecs_seen_p) - { - c_parser_error (parser, "expected declaration specifiers"); - c_parser_skip_to_end_of_block_or_statement (parser); - return; - } - finish_declspecs (specs); - if (c_parser_next_token_is (parser, CPP_SEMICOLON)) - { - if (empty_ok) - shadow_tag (specs); - else - { - shadow_tag_warned (specs, 1); - pedwarn ("empty declaration"); - } - c_parser_consume_token (parser); - return; - } - pending_xref_error (); - prefix_attrs = specs->attrs; - all_prefix_attrs = prefix_attrs; - specs->attrs = NULL_TREE; - while (true) - { - struct c_declarator *declarator; - bool dummy = false; - tree fnbody; - /* Declaring either one or more declarators (in which case we - should diagnose if there were no declaration specifiers) or a - function definition (in which case the diagnostic for - implicit int suffices). */ - declarator = c_parser_declarator (parser, specs->type_seen_p, - C_DTR_NORMAL, &dummy); - if (declarator == NULL) - { - c_parser_skip_to_end_of_block_or_statement (parser); - return; - } - if (c_parser_next_token_is (parser, CPP_EQ) - || c_parser_next_token_is (parser, CPP_COMMA) - || c_parser_next_token_is (parser, CPP_SEMICOLON) - || c_parser_next_token_is_keyword (parser, RID_ASM) - || c_parser_next_token_is_keyword (parser, RID_ATTRIBUTE)) - { - tree asm_name = NULL_TREE; - tree postfix_attrs = NULL_TREE; - if (!diagnosed_no_specs && !specs->declspecs_seen_p) - { - diagnosed_no_specs = true; - pedwarn ("data definition has no type or storage class"); - } - /* Having seen a data definition, there cannot now be a - function definition. */ - fndef_ok = false; - if (c_parser_next_token_is_keyword (parser, RID_ASM)) - asm_name = c_parser_simple_asm_expr (parser); - if (c_parser_next_token_is_keyword (parser, RID_ATTRIBUTE)) - postfix_attrs = c_parser_attributes (parser); - if (c_parser_next_token_is (parser, CPP_EQ)) - { - tree d; - struct c_expr init; - c_parser_consume_token (parser); - /* The declaration of the variable is in effect while - its initializer is parsed. */ - d = start_decl (declarator, specs, true, - chainon (postfix_attrs, all_prefix_attrs)); - if (!d) - d = error_mark_node; - start_init (d, asm_name, global_bindings_p ()); - init = c_parser_initializer (parser); - finish_init (); - if (d != error_mark_node) - { - maybe_warn_string_init (TREE_TYPE (d), init); - finish_decl (d, init.value, asm_name); - } - } - else - { - tree d = start_decl (declarator, specs, false, - chainon (postfix_attrs, - all_prefix_attrs)); - if (d) - finish_decl (d, NULL_TREE, asm_name); - } - if (c_parser_next_token_is (parser, CPP_COMMA)) - { - c_parser_consume_token (parser); - if (c_parser_next_token_is_keyword (parser, RID_ATTRIBUTE)) - all_prefix_attrs = chainon (c_parser_attributes (parser), - prefix_attrs); - else - all_prefix_attrs = prefix_attrs; - continue; - } - else if (c_parser_next_token_is (parser, CPP_SEMICOLON)) - { - c_parser_consume_token (parser); - return; - } - else - { - c_parser_error (parser, "expected %<,%> or %<;%>"); - c_parser_skip_to_end_of_block_or_statement (parser); - return; - } - } - else if (!fndef_ok) - { - c_parser_error (parser, "expected %<=%>, %<,%>, %<;%>, " - "%<asm%> or %<__attribute__%>"); - c_parser_skip_to_end_of_block_or_statement (parser); - return; - } - /* Function definition (nested or otherwise). */ - if (nested) - { - if (pedantic) - pedwarn ("ISO C forbids nested functions"); - push_function_context (); - } - if (!start_function (specs, declarator, all_prefix_attrs)) - { - /* This can appear in many cases looking nothing like a - function definition, so we don't give a more specific - error suggesting there was one. */ - c_parser_error (parser, "expected %<=%>, %<,%>, %<;%>, %<asm%> " - "or %<__attribute__%>"); - if (nested) - pop_function_context (); - break; - } - /* Parse old-style parameter declarations. ??? Attributes are - not allowed to start declaration specifiers here because of a - syntax conflict between a function declaration with attribute - suffix and a function definition with an attribute prefix on - first old-style parameter declaration. Following the old - parser, they are not accepted on subsequent old-style - parameter declarations either. However, there is no - ambiguity after the first declaration, nor indeed on the - first as long as we don't allow postfix attributes after a - declarator with a nonempty identifier list in a definition; - and postfix attributes have never been accepted here in - function definitions either. */ - while (c_parser_next_token_is_not (parser, CPP_EOF) - && c_parser_next_token_is_not (parser, CPP_OPEN_BRACE)) - c_parser_declaration_or_fndef (parser, false, false, true, false); - DECL_SOURCE_LOCATION (current_function_decl) - = c_parser_peek_token (parser)->location; - store_parm_decls (); - fnbody = c_parser_compound_statement (parser); - if (nested) - { - tree decl = current_function_decl; - add_stmt (fnbody); - finish_function (); - pop_function_context (); - add_stmt (build_stmt (DECL_EXPR, decl)); - } - else - { - add_stmt (fnbody); - finish_function (); - } - break; - } -} - -/* Parse an asm-definition (asm() outside a function body). This is a - GNU extension. - - asm-definition: - simple-asm-expr ; -*/ - -static void -c_parser_asm_definition (c_parser *parser) -{ - tree asm_str = c_parser_simple_asm_expr (parser); - if (asm_str) - cgraph_add_asm_node (asm_str); - c_parser_skip_until_found (parser, CPP_SEMICOLON, "expected %<;%>"); -} - -/* Parse some declaration specifiers (possibly none) (C90 6.5, C99 - 6.7), adding them to SPECS (which may already include some). - Storage class specifiers are accepted iff SCSPEC_OK; type - specifiers are accepted iff TYPESPEC_OK; attributes are accepted at - the start iff START_ATTR_OK. - - declaration-specifiers: - storage-class-specifier declaration-specifiers[opt] - type-specifier declaration-specifiers[opt] - type-qualifier declaration-specifiers[opt] - function-specifier declaration-specifiers[opt] - - Function specifiers (inline) are from C99, and are currently - handled as storage class specifiers, as is __thread. - - C90 6.5.1, C99 6.7.1: - storage-class-specifier: - typedef - extern - static - auto - register - - C99 6.7.4: - function-specifier: - inline - - C90 6.5.2, C99 6.7.2: - type-specifier: - void - char - short - int - long - float - double - signed - unsigned - _Bool - _Complex - [_Imaginary removed in C99 TC2] - struct-or-union-specifier - enum-specifier - typedef-name - - (_Bool and _Complex are new in C99.) - - C90 6.5.3, C99 6.7.3: - - type-qualifier: - const - restrict - volatile - - (restrict is new in C99.) - - GNU extensions: - - declaration-specifiers: - attributes declaration-specifiers[opt] - - storage-class-specifier: - __thread - - type-specifier: - typeof-specifier - _Decimal32 - _Decimal64 - _Decimal128 - - Objective-C: - - type-specifier: - class-name objc-protocol-refs[opt] - typedef-name objc-protocol-refs - objc-protocol-refs -*/ - -static void -c_parser_declspecs (c_parser *parser, struct c_declspecs *specs, - bool scspec_ok, bool typespec_ok, bool start_attr_ok) -{ - bool attrs_ok = start_attr_ok; - bool seen_type = specs->type_seen_p; - while (c_parser_next_token_is (parser, CPP_NAME) - || c_parser_next_token_is (parser, CPP_KEYWORD) - || (c_dialect_objc () && c_parser_next_token_is (parser, CPP_LESS))) - { - struct c_typespec t; - tree attrs; - if (c_parser_next_token_is (parser, CPP_NAME)) - { - tree value = c_parser_peek_token (parser)->value; - c_id_kind kind = c_parser_peek_token (parser)->id_kind; - /* This finishes the specifiers unless a type name is OK, it - is declared as a type name and a type name hasn't yet - been seen. */ - if (!typespec_ok || seen_type - || (kind != C_ID_TYPENAME && kind != C_ID_CLASSNAME)) - break; - c_parser_consume_token (parser); - seen_type = true; - attrs_ok = true; - if (kind == C_ID_TYPENAME - && (!c_dialect_objc () - || c_parser_next_token_is_not (parser, CPP_LESS))) - { - t.kind = ctsk_typedef; - /* For a typedef name, record the meaning, not the name. - In case of 'foo foo, bar;'. */ - t.spec = lookup_name (value); - } - else - { - tree proto = NULL_TREE; - gcc_assert (c_dialect_objc ()); - t.kind = ctsk_objc; - if (c_parser_next_token_is (parser, CPP_LESS)) - proto = c_parser_objc_protocol_refs (parser); - t.spec = objc_get_protocol_qualified_type (value, proto); - } - declspecs_add_type (specs, t); - continue; - } - if (c_parser_next_token_is (parser, CPP_LESS)) - { - /* Make "<SomeProtocol>" equivalent to "id <SomeProtocol>" - - nisse@lysator.liu.se. */ - tree proto; - gcc_assert (c_dialect_objc ()); - if (!typespec_ok || seen_type) - break; - proto = c_parser_objc_protocol_refs (parser); - t.kind = ctsk_objc; - t.spec = objc_get_protocol_qualified_type (NULL_TREE, proto); - declspecs_add_type (specs, t); - continue; - } - gcc_assert (c_parser_next_token_is (parser, CPP_KEYWORD)); - switch (c_parser_peek_token (parser)->keyword) - { - case RID_STATIC: - case RID_EXTERN: - case RID_REGISTER: - case RID_TYPEDEF: - case RID_INLINE: - case RID_AUTO: - case RID_THREAD: - if (!scspec_ok) - goto out; - attrs_ok = true; - /* TODO: Distinguish between function specifiers (inline) - and storage class specifiers, either here or in - declspecs_add_scspec. */ - declspecs_add_scspec (specs, c_parser_peek_token (parser)->value); - c_parser_consume_token (parser); - break; - case RID_UNSIGNED: - case RID_LONG: - case RID_SHORT: - case RID_SIGNED: - case RID_COMPLEX: - case RID_INT: - case RID_CHAR: - case RID_FLOAT: - case RID_DOUBLE: - case RID_VOID: - case RID_DFLOAT32: - case RID_DFLOAT64: - case RID_DFLOAT128: - case RID_BOOL: - if (!typespec_ok) - goto out; - attrs_ok = true; - seen_type = true; - OBJC_NEED_RAW_IDENTIFIER (1); - t.kind = ctsk_resword; - t.spec = c_parser_peek_token (parser)->value; - declspecs_add_type (specs, t); - c_parser_consume_token (parser); - break; - case RID_ENUM: - if (!typespec_ok) - goto out; - attrs_ok = true; - seen_type = true; - t = c_parser_enum_specifier (parser); - declspecs_add_type (specs, t); - break; - case RID_STRUCT: - case RID_UNION: - if (!typespec_ok) - goto out; - attrs_ok = true; - seen_type = true; - t = c_parser_struct_or_union_specifier (parser); - declspecs_add_type (specs, t); - break; - case RID_TYPEOF: - /* ??? The old parser rejected typeof after other type - specifiers, but is a syntax error the best way of - handling this? */ - if (!typespec_ok || seen_type) - goto out; - attrs_ok = true; - seen_type = true; - t = c_parser_typeof_specifier (parser); - declspecs_add_type (specs, t); - break; - case RID_CONST: - case RID_VOLATILE: - case RID_RESTRICT: - attrs_ok = true; - declspecs_add_qual (specs, c_parser_peek_token (parser)->value); - c_parser_consume_token (parser); - break; - case RID_ATTRIBUTE: - if (!attrs_ok) - goto out; - attrs = c_parser_attributes (parser); - declspecs_add_attrs (specs, attrs); - break; - default: - goto out; - } - } - out: ; -} - -/* Parse an enum specifier (C90 6.5.2.2, C99 6.7.2.2). - - enum-specifier: - enum attributes[opt] identifier[opt] { enumerator-list } attributes[opt] - enum attributes[opt] identifier[opt] { enumerator-list , } attributes[opt] - enum attributes[opt] identifier - - The form with trailing comma is new in C99. The forms with - attributes are GNU extensions. In GNU C, we accept any expression - without commas in the syntax (assignment expressions, not just - conditional expressions); assignment expressions will be diagnosed - as non-constant. - - enumerator-list: - enumerator - enumerator-list , enumerator - - enumerator: - enumeration-constant - enumeration-constant = constant-expression -*/ - -static struct c_typespec -c_parser_enum_specifier (c_parser *parser) -{ - struct c_typespec ret; - tree attrs; - tree ident = NULL_TREE; - gcc_assert (c_parser_next_token_is_keyword (parser, RID_ENUM)); - c_parser_consume_token (parser); - attrs = c_parser_attributes (parser); - if (c_parser_next_token_is (parser, CPP_NAME)) - { - ident = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - } - if (c_parser_next_token_is (parser, CPP_OPEN_BRACE)) - { - /* Parse an enum definition. */ - tree type = start_enum (ident); - tree postfix_attrs; - /* We chain the enumerators in reverse order, then put them in - forward order at the end. */ - tree values = NULL_TREE; - c_parser_consume_token (parser); - while (true) - { - tree enum_id; - tree enum_value; - tree enum_decl; - bool seen_comma; - if (c_parser_next_token_is_not (parser, CPP_NAME)) - { - c_parser_error (parser, "expected identifier"); - c_parser_skip_until_found (parser, CPP_CLOSE_BRACE, NULL); - values = error_mark_node; - break; - } - enum_id = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_EQ)) - { - c_parser_consume_token (parser); - enum_value = c_parser_expr_no_commas (parser, NULL).value; - } - else - enum_value = NULL_TREE; - enum_decl = build_enumerator (enum_id, enum_value); - TREE_CHAIN (enum_decl) = values; - values = enum_decl; - seen_comma = false; - if (c_parser_next_token_is (parser, CPP_COMMA)) - { - seen_comma = true; - c_parser_consume_token (parser); - } - if (c_parser_next_token_is (parser, CPP_CLOSE_BRACE)) - { - if (seen_comma && pedantic && !flag_isoc99) - pedwarn ("comma at end of enumerator list"); - c_parser_consume_token (parser); - break; - } - if (!seen_comma) - { - c_parser_error (parser, "expected %<,%> or %<}%>"); - c_parser_skip_until_found (parser, CPP_CLOSE_BRACE, NULL); - values = error_mark_node; - break; - } - } - postfix_attrs = c_parser_attributes (parser); - ret.spec = finish_enum (type, nreverse (values), - chainon (attrs, postfix_attrs)); - ret.kind = ctsk_tagdef; - return ret; - } - else if (!ident) - { - c_parser_error (parser, "expected %<{%>"); - ret.spec = error_mark_node; - ret.kind = ctsk_tagref; - return ret; - } - ret = parser_xref_tag (ENUMERAL_TYPE, ident); - /* In ISO C, enumerated types can be referred to only if already - defined. */ - if (pedantic && !COMPLETE_TYPE_P (ret.spec)) - pedwarn ("ISO C forbids forward references to %<enum%> types"); - return ret; -} - -/* Parse a struct or union specifier (C90 6.5.2.1, C99 6.7.2.1). - - struct-or-union-specifier: - struct-or-union attributes[opt] identifier[opt] - { struct-contents } attributes[opt] - struct-or-union attributes[opt] identifier - - struct-contents: - struct-declaration-list - - struct-declaration-list: - struct-declaration ; - struct-declaration-list struct-declaration ; - - GNU extensions: - - struct-contents: - empty - struct-declaration - struct-declaration-list struct-declaration - - struct-declaration-list: - struct-declaration-list ; - ; - - (Note that in the syntax here, unlike that in ISO C, the semicolons - are included here rather than in struct-declaration, in order to - describe the syntax with extra semicolons and missing semicolon at - end.) - - Objective-C: - - struct-declaration-list: - @defs ( class-name ) - - (Note this does not include a trailing semicolon, but can be - followed by further declarations, and gets a pedwarn-if-pedantic - when followed by a semicolon.) */ - -static struct c_typespec -c_parser_struct_or_union_specifier (c_parser *parser) -{ - struct c_typespec ret; - tree attrs; - tree ident = NULL_TREE; - enum tree_code code; - switch (c_parser_peek_token (parser)->keyword) - { - case RID_STRUCT: - code = RECORD_TYPE; - break; - case RID_UNION: - code = UNION_TYPE; - break; - default: - gcc_unreachable (); - } - c_parser_consume_token (parser); - attrs = c_parser_attributes (parser); - if (c_parser_next_token_is (parser, CPP_NAME)) - { - ident = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - } - if (c_parser_next_token_is (parser, CPP_OPEN_BRACE)) - { - /* Parse a struct or union definition. Start the scope of the - tag before parsing components. */ - tree type = start_struct (code, ident); - tree postfix_attrs; - /* We chain the components in reverse order, then put them in - forward order at the end. Each struct-declaration may - declare multiple components (comma-separated), so we must use - chainon to join them, although when parsing each - struct-declaration we can use TREE_CHAIN directly. - - The theory behind all this is that there will be more - semicolon separated fields than comma separated fields, and - so we'll be minimizing the number of node traversals required - by chainon. */ - tree contents = NULL_TREE; - c_parser_consume_token (parser); - /* Handle the Objective-C @defs construct, - e.g. foo(sizeof(struct{ @defs(ClassName) }));. */ - if (c_parser_next_token_is_keyword (parser, RID_AT_DEFS)) - { - tree name; - gcc_assert (c_dialect_objc ()); - c_parser_consume_token (parser); - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - goto end_at_defs; - if (c_parser_next_token_is (parser, CPP_NAME) - && c_parser_peek_token (parser)->id_kind == C_ID_CLASSNAME) - { - name = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - } - else - { - c_parser_error (parser, "expected class name"); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - goto end_at_defs; - } - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - contents = nreverse (objc_get_class_ivars (name)); - } - end_at_defs: - /* Parse the struct-declarations and semicolons. Problems with - semicolons are diagnosed here; empty structures are diagnosed - elsewhere. */ - while (true) - { - tree decls; - /* Parse any stray semicolon. */ - if (c_parser_next_token_is (parser, CPP_SEMICOLON)) - { - if (pedantic) - pedwarn ("extra semicolon in struct or union specified"); - c_parser_consume_token (parser); - continue; - } - /* Stop if at the end of the struct or union contents. */ - if (c_parser_next_token_is (parser, CPP_CLOSE_BRACE)) - { - c_parser_consume_token (parser); - break; - } - /* Accept #pragmas at struct scope. */ - if (c_parser_next_token_is (parser, CPP_PRAGMA)) - { - c_parser_pragma (parser, pragma_external); - continue; - } - /* Parse some comma-separated declarations, but not the - trailing semicolon if any. */ - decls = c_parser_struct_declaration (parser); - contents = chainon (decls, contents); - /* If no semicolon follows, either we have a parse error or - are at the end of the struct or union and should - pedwarn. */ - if (c_parser_next_token_is (parser, CPP_SEMICOLON)) - c_parser_consume_token (parser); - else - { - if (c_parser_next_token_is (parser, CPP_CLOSE_BRACE)) - pedwarn ("no semicolon at end of struct or union"); - else - { - c_parser_error (parser, "expected %<;%>"); - c_parser_skip_until_found (parser, CPP_CLOSE_BRACE, NULL); - break; - } - } - } - postfix_attrs = c_parser_attributes (parser); - ret.spec = finish_struct (type, nreverse (contents), - chainon (attrs, postfix_attrs)); - ret.kind = ctsk_tagdef; - return ret; - } - else if (!ident) - { - c_parser_error (parser, "expected %<{%>"); - ret.spec = error_mark_node; - ret.kind = ctsk_tagref; - return ret; - } - ret = parser_xref_tag (code, ident); - return ret; -} - -/* Parse a struct-declaration (C90 6.5.2.1, C99 6.7.2.1), *without* - the trailing semicolon. - - struct-declaration: - specifier-qualifier-list struct-declarator-list - - specifier-qualifier-list: - type-specifier specifier-qualifier-list[opt] - type-qualifier specifier-qualifier-list[opt] - attributes specifier-qualifier-list[opt] - - struct-declarator-list: - struct-declarator - struct-declarator-list , attributes[opt] struct-declarator - - struct-declarator: - declarator attributes[opt] - declarator[opt] : constant-expression attributes[opt] - - GNU extensions: - - struct-declaration: - __extension__ struct-declaration - specifier-qualifier-list - - Unlike the ISO C syntax, semicolons are handled elsewhere. The use - of attributes where shown is a GNU extension. In GNU C, we accept - any expression without commas in the syntax (assignment - expressions, not just conditional expressions); assignment - expressions will be diagnosed as non-constant. */ - -static tree -c_parser_struct_declaration (c_parser *parser) -{ - struct c_declspecs *specs; - tree prefix_attrs; - tree all_prefix_attrs; - tree decls; - if (c_parser_next_token_is_keyword (parser, RID_EXTENSION)) - { - int ext; - tree decl; - ext = disable_extension_diagnostics (); - c_parser_consume_token (parser); - decl = c_parser_struct_declaration (parser); - restore_extension_diagnostics (ext); - return decl; - } - specs = build_null_declspecs (); - c_parser_declspecs (parser, specs, false, true, true); - if (parser->error) - return NULL_TREE; - if (!specs->declspecs_seen_p) - { - c_parser_error (parser, "expected specifier-qualifier-list"); - return NULL_TREE; - } - finish_declspecs (specs); - if (c_parser_next_token_is (parser, CPP_SEMICOLON)) - { - tree ret; - if (!specs->type_seen_p) - { - if (pedantic) - pedwarn ("ISO C forbids member declarations with no members"); - shadow_tag_warned (specs, pedantic); - ret = NULL_TREE; - } - else - { - /* Support for unnamed structs or unions as members of - structs or unions (which is [a] useful and [b] supports - MS P-SDK). */ - ret = grokfield (build_id_declarator (NULL_TREE), specs, NULL_TREE); - } - return ret; - } - pending_xref_error (); - prefix_attrs = specs->attrs; - all_prefix_attrs = prefix_attrs; - specs->attrs = NULL_TREE; - decls = NULL_TREE; - while (true) - { - /* Declaring one or more declarators or un-named bit-fields. */ - struct c_declarator *declarator; - bool dummy = false; - if (c_parser_next_token_is (parser, CPP_COLON)) - declarator = build_id_declarator (NULL_TREE); - else - declarator = c_parser_declarator (parser, specs->type_seen_p, - C_DTR_NORMAL, &dummy); - if (declarator == NULL) - { - c_parser_skip_to_end_of_block_or_statement (parser); - break; - } - if (c_parser_next_token_is (parser, CPP_COLON) - || c_parser_next_token_is (parser, CPP_COMMA) - || c_parser_next_token_is (parser, CPP_SEMICOLON) - || c_parser_next_token_is (parser, CPP_CLOSE_BRACE) - || c_parser_next_token_is_keyword (parser, RID_ATTRIBUTE)) - { - tree postfix_attrs = NULL_TREE; - tree width = NULL_TREE; - tree d; - if (c_parser_next_token_is (parser, CPP_COLON)) - { - c_parser_consume_token (parser); - width = c_parser_expr_no_commas (parser, NULL).value; - } - if (c_parser_next_token_is_keyword (parser, RID_ATTRIBUTE)) - postfix_attrs = c_parser_attributes (parser); - d = grokfield (declarator, specs, width); - decl_attributes (&d, chainon (postfix_attrs, - all_prefix_attrs), 0); - TREE_CHAIN (d) = decls; - decls = d; - if (c_parser_next_token_is_keyword (parser, RID_ATTRIBUTE)) - all_prefix_attrs = chainon (c_parser_attributes (parser), - prefix_attrs); - else - all_prefix_attrs = prefix_attrs; - if (c_parser_next_token_is (parser, CPP_COMMA)) - c_parser_consume_token (parser); - else if (c_parser_next_token_is (parser, CPP_SEMICOLON) - || c_parser_next_token_is (parser, CPP_CLOSE_BRACE)) - { - /* Semicolon consumed in caller. */ - break; - } - else - { - c_parser_error (parser, "expected %<,%>, %<;%> or %<}%>"); - break; - } - } - else - { - c_parser_error (parser, - "expected %<:%>, %<,%>, %<;%>, %<}%> or " - "%<__attribute__%>"); - break; - } - } - return decls; -} - -/* Parse a typeof specifier (a GNU extension). - - typeof-specifier: - typeof ( expression ) - typeof ( type-name ) -*/ - -static struct c_typespec -c_parser_typeof_specifier (c_parser *parser) -{ - struct c_typespec ret; - ret.kind = ctsk_typeof; - ret.spec = error_mark_node; - gcc_assert (c_parser_next_token_is_keyword (parser, RID_TYPEOF)); - c_parser_consume_token (parser); - skip_evaluation++; - in_typeof++; - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - skip_evaluation--; - in_typeof--; - return ret; - } - if (c_parser_next_token_starts_typename (parser)) - { - struct c_type_name *type = c_parser_type_name (parser); - skip_evaluation--; - in_typeof--; - if (type != NULL) - { - ret.spec = groktypename (type); - pop_maybe_used (variably_modified_type_p (ret.spec, NULL_TREE)); - } - } - else - { - bool was_vm; - struct c_expr expr = c_parser_expression (parser); - skip_evaluation--; - in_typeof--; - if (TREE_CODE (expr.value) == COMPONENT_REF - && DECL_C_BIT_FIELD (TREE_OPERAND (expr.value, 1))) - error ("%<typeof%> applied to a bit-field"); - ret.spec = TREE_TYPE (expr.value); - was_vm = variably_modified_type_p (ret.spec, NULL_TREE); - /* This should be returned with the type so that when the type - is evaluated, this can be evaluated. For now, we avoid - evaluation when the context might. */ - if (!skip_evaluation && was_vm) - { - tree e = expr.value; - - /* If the expression is not of a type to which we cannot assign a line - number, wrap the thing in a no-op NOP_EXPR. */ - if (DECL_P (e) || CONSTANT_CLASS_P (e)) - e = build1 (NOP_EXPR, void_type_node, e); - - if (EXPR_P (e)) - SET_EXPR_LOCATION (e, input_location); - - add_stmt (e); - } - pop_maybe_used (was_vm); - } - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - return ret; -} - -/* Parse a declarator, possibly an abstract declarator (C90 6.5.4, - 6.5.5, C99 6.7.5, 6.7.6). If TYPE_SEEN_P then a typedef name may - be redeclared; otherwise it may not. KIND indicates which kind of - declarator is wanted. Returns a valid declarator except in the - case of a syntax error in which case NULL is returned. *SEEN_ID is - set to true if an identifier being declared is seen; this is used - to diagnose bad forms of abstract array declarators and to - determine whether an identifier list is syntactically permitted. - - declarator: - pointer[opt] direct-declarator - - direct-declarator: - identifier - ( attributes[opt] declarator ) - direct-declarator array-declarator - direct-declarator ( parameter-type-list ) - direct-declarator ( identifier-list[opt] ) - - pointer: - * type-qualifier-list[opt] - * type-qualifier-list[opt] pointer - - type-qualifier-list: - type-qualifier - attributes - type-qualifier-list type-qualifier - type-qualifier-list attributes - - parameter-type-list: - parameter-list - parameter-list , ... - - parameter-list: - parameter-declaration - parameter-list , parameter-declaration - - parameter-declaration: - declaration-specifiers declarator attributes[opt] - declaration-specifiers abstract-declarator[opt] attributes[opt] - - identifier-list: - identifier - identifier-list , identifier - - abstract-declarator: - pointer - pointer[opt] direct-abstract-declarator - - direct-abstract-declarator: - ( attributes[opt] abstract-declarator ) - direct-abstract-declarator[opt] array-declarator - direct-abstract-declarator[opt] ( parameter-type-list[opt] ) - - GNU extensions: - - direct-declarator: - direct-declarator ( parameter-forward-declarations - parameter-type-list[opt] ) - - direct-abstract-declarator: - direct-abstract-declarator[opt] ( parameter-forward-declarations - parameter-type-list[opt] ) - - parameter-forward-declarations: - parameter-list ; - parameter-forward-declarations parameter-list ; - - The uses of attributes shown above are GNU extensions. - - Some forms of array declarator are not included in C99 in the - syntax for abstract declarators; these are disallowed elsewhere. - This may be a defect (DR#289). - - This function also accepts an omitted abstract declarator as being - an abstract declarator, although not part of the formal syntax. */ - -static struct c_declarator * -c_parser_declarator (c_parser *parser, bool type_seen_p, c_dtr_syn kind, - bool *seen_id) -{ - /* Parse any initial pointer part. */ - if (c_parser_next_token_is (parser, CPP_MULT)) - { - struct c_declspecs *quals_attrs = build_null_declspecs (); - struct c_declarator *inner; - c_parser_consume_token (parser); - c_parser_declspecs (parser, quals_attrs, false, false, true); - inner = c_parser_declarator (parser, type_seen_p, kind, seen_id); - if (inner == NULL) - return NULL; - else - return make_pointer_declarator (quals_attrs, inner); - } - /* Now we have a direct declarator, direct abstract declarator or - nothing (which counts as a direct abstract declarator here). */ - return c_parser_direct_declarator (parser, type_seen_p, kind, seen_id); -} - -/* Parse a direct declarator or direct abstract declarator; arguments - as c_parser_declarator. */ - -static struct c_declarator * -c_parser_direct_declarator (c_parser *parser, bool type_seen_p, c_dtr_syn kind, - bool *seen_id) -{ - /* The direct declarator must start with an identifier (possibly - omitted) or a parenthesized declarator (possibly abstract). In - an ordinary declarator, initial parentheses must start a - parenthesized declarator. In an abstract declarator or parameter - declarator, they could start a parenthesized declarator or a - parameter list. To tell which, the open parenthesis and any - following attributes must be read. If a declaration specifier - follows, then it is a parameter list; if the specifier is a - typedef name, there might be an ambiguity about redeclaring it, - which is resolved in the direction of treating it as a typedef - name. If a close parenthesis follows, it is also an empty - parameter list, as the syntax does not permit empty abstract - declarators. Otherwise, it is a parenthesized declarator (in - which case the analysis may be repeated inside it, recursively). - - ??? There is an ambiguity in a parameter declaration "int - (__attribute__((foo)) x)", where x is not a typedef name: it - could be an abstract declarator for a function, or declare x with - parentheses. The proper resolution of this ambiguity needs - documenting. At present we follow an accident of the old - parser's implementation, whereby the first parameter must have - some declaration specifiers other than just attributes. Thus as - a parameter declaration it is treated as a parenthesized - parameter named x, and as an abstract declarator it is - rejected. - - ??? Also following the old parser, attributes inside an empty - parameter list are ignored, making it a list not yielding a - prototype, rather than giving an error or making it have one - parameter with implicit type int. - - ??? Also following the old parser, typedef names may be - redeclared in declarators, but not Objective-C class names. */ - - if (kind != C_DTR_ABSTRACT - && c_parser_next_token_is (parser, CPP_NAME) - && ((type_seen_p - && c_parser_peek_token (parser)->id_kind == C_ID_TYPENAME) - || c_parser_peek_token (parser)->id_kind == C_ID_ID)) - { - struct c_declarator *inner - = build_id_declarator (c_parser_peek_token (parser)->value); - *seen_id = true; - inner->id_loc = c_parser_peek_token (parser)->location; - c_parser_consume_token (parser); - return c_parser_direct_declarator_inner (parser, *seen_id, inner); - } - - if (kind != C_DTR_NORMAL - && c_parser_next_token_is (parser, CPP_OPEN_SQUARE)) - { - struct c_declarator *inner = build_id_declarator (NULL_TREE); - return c_parser_direct_declarator_inner (parser, *seen_id, inner); - } - - /* Either we are at the end of an abstract declarator, or we have - parentheses. */ - - if (c_parser_next_token_is (parser, CPP_OPEN_PAREN)) - { - tree attrs; - struct c_declarator *inner; - c_parser_consume_token (parser); - attrs = c_parser_attributes (parser); - if (kind != C_DTR_NORMAL - && (c_parser_next_token_starts_declspecs (parser) - || c_parser_next_token_is (parser, CPP_CLOSE_PAREN))) - { - struct c_arg_info *args - = c_parser_parms_declarator (parser, kind == C_DTR_NORMAL, - attrs); - if (args == NULL) - return NULL; - else - { - inner - = build_function_declarator (args, - build_id_declarator (NULL_TREE)); - return c_parser_direct_declarator_inner (parser, *seen_id, - inner); - } - } - /* A parenthesized declarator. */ - inner = c_parser_declarator (parser, type_seen_p, kind, seen_id); - if (inner != NULL && attrs != NULL) - inner = build_attrs_declarator (attrs, inner); - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - { - c_parser_consume_token (parser); - if (inner == NULL) - return NULL; - else - return c_parser_direct_declarator_inner (parser, *seen_id, inner); - } - else - { - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - return NULL; - } - } - else - { - if (kind == C_DTR_NORMAL) - { - c_parser_error (parser, "expected identifier or %<(%>"); - return NULL; - } - else - return build_id_declarator (NULL_TREE); - } -} - -/* Parse part of a direct declarator or direct abstract declarator, - given that some (in INNER) has already been parsed; ID_PRESENT is - true if an identifier is present, false for an abstract - declarator. */ - -static struct c_declarator * -c_parser_direct_declarator_inner (c_parser *parser, bool id_present, - struct c_declarator *inner) -{ - /* Parse a sequence of array declarators and parameter lists. */ - if (c_parser_next_token_is (parser, CPP_OPEN_SQUARE)) - { - struct c_declarator *declarator; - struct c_declspecs *quals_attrs = build_null_declspecs (); - bool static_seen; - bool star_seen; - tree dimen; - c_parser_consume_token (parser); - c_parser_declspecs (parser, quals_attrs, false, false, true); - static_seen = c_parser_next_token_is_keyword (parser, RID_STATIC); - if (static_seen) - c_parser_consume_token (parser); - if (static_seen && !quals_attrs->declspecs_seen_p) - c_parser_declspecs (parser, quals_attrs, false, false, true); - if (!quals_attrs->declspecs_seen_p) - quals_attrs = NULL; - /* If "static" is present, there must be an array dimension. - Otherwise, there may be a dimension, "*", or no - dimension. */ - if (static_seen) - { - star_seen = false; - dimen = c_parser_expr_no_commas (parser, NULL).value; - } - else - { - if (c_parser_next_token_is (parser, CPP_CLOSE_SQUARE)) - { - dimen = NULL_TREE; - star_seen = false; - } - else if (c_parser_next_token_is (parser, CPP_MULT)) - { - if (c_parser_peek_2nd_token (parser)->type == CPP_CLOSE_SQUARE) - { - dimen = NULL_TREE; - star_seen = true; - c_parser_consume_token (parser); - } - else - { - star_seen = false; - dimen = c_parser_expr_no_commas (parser, NULL).value; - } - } - else - { - star_seen = false; - dimen = c_parser_expr_no_commas (parser, NULL).value; - } - } - if (c_parser_next_token_is (parser, CPP_CLOSE_SQUARE)) - c_parser_consume_token (parser); - else - { - c_parser_skip_until_found (parser, CPP_CLOSE_SQUARE, - "expected %<]%>"); - return NULL; - } - declarator = build_array_declarator (dimen, quals_attrs, static_seen, - star_seen); - if (declarator == NULL) - return NULL; - inner = set_array_declarator_inner (declarator, inner, !id_present); - return c_parser_direct_declarator_inner (parser, id_present, inner); - } - else if (c_parser_next_token_is (parser, CPP_OPEN_PAREN)) - { - tree attrs; - struct c_arg_info *args; - c_parser_consume_token (parser); - attrs = c_parser_attributes (parser); - args = c_parser_parms_declarator (parser, id_present, attrs); - if (args == NULL) - return NULL; - else - { - inner = build_function_declarator (args, inner); - return c_parser_direct_declarator_inner (parser, id_present, inner); - } - } - return inner; -} - -/* Parse a parameter list or identifier list, including the closing - parenthesis but not the opening one. ATTRS are the attributes at - the start of the list. ID_LIST_OK is true if an identifier list is - acceptable; such a list must not have attributes at the start. */ - -static struct c_arg_info * -c_parser_parms_declarator (c_parser *parser, bool id_list_ok, tree attrs) -{ - push_scope (); - declare_parm_level (); - /* If the list starts with an identifier, it is an identifier list. - Otherwise, it is either a prototype list or an empty list. */ - if (id_list_ok - && !attrs - && c_parser_next_token_is (parser, CPP_NAME) - && c_parser_peek_token (parser)->id_kind == C_ID_ID) - { - tree list = NULL_TREE, *nextp = &list; - while (c_parser_next_token_is (parser, CPP_NAME) - && c_parser_peek_token (parser)->id_kind == C_ID_ID) - { - *nextp = build_tree_list (NULL_TREE, - c_parser_peek_token (parser)->value); - nextp = & TREE_CHAIN (*nextp); - c_parser_consume_token (parser); - if (c_parser_next_token_is_not (parser, CPP_COMMA)) - break; - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - { - c_parser_error (parser, "expected identifier"); - break; - } - } - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - { - struct c_arg_info *ret = XOBNEW (&parser_obstack, struct c_arg_info); - ret->parms = 0; - ret->tags = 0; - ret->types = list; - ret->others = 0; - ret->pending_sizes = 0; - ret->had_vla_unspec = 0; - c_parser_consume_token (parser); - pop_scope (); - return ret; - } - else - { - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - pop_scope (); - return NULL; - } - } - else - { - struct c_arg_info *ret = c_parser_parms_list_declarator (parser, attrs); - pop_scope (); - return ret; - } -} - -/* Parse a parameter list (possibly empty), including the closing - parenthesis but not the opening one. ATTRS are the attributes at - the start of the list. */ - -static struct c_arg_info * -c_parser_parms_list_declarator (c_parser *parser, tree attrs) -{ - bool good_parm = false; - /* ??? Following the old parser, forward parameter declarations may - use abstract declarators, and if no real parameter declarations - follow the forward declarations then this is not diagnosed. Also - note as above that attributes are ignored as the only contents of - the parentheses, or as the only contents after forward - declarations. */ - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - { - struct c_arg_info *ret = XOBNEW (&parser_obstack, struct c_arg_info); - ret->parms = 0; - ret->tags = 0; - ret->types = 0; - ret->others = 0; - ret->pending_sizes = 0; - ret->had_vla_unspec = 0; - c_parser_consume_token (parser); - return ret; - } - if (c_parser_next_token_is (parser, CPP_ELLIPSIS)) - { - struct c_arg_info *ret = XOBNEW (&parser_obstack, struct c_arg_info); - ret->parms = 0; - ret->tags = 0; - ret->others = 0; - ret->pending_sizes = 0; - ret->had_vla_unspec = 0; - /* Suppress -Wold-style-definition for this case. */ - ret->types = error_mark_node; - error ("ISO C requires a named argument before %<...%>"); - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - { - c_parser_consume_token (parser); - return ret; - } - else - { - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - return NULL; - } - } - /* Nonempty list of parameters, either terminated with semicolon - (forward declarations; recurse) or with close parenthesis (normal - function) or with ", ... )" (variadic function). */ - while (true) - { - /* Parse a parameter. */ - struct c_parm *parm = c_parser_parameter_declaration (parser, attrs); - attrs = NULL_TREE; - if (parm != NULL) - { - good_parm = true; - push_parm_decl (parm); - } - if (c_parser_next_token_is (parser, CPP_SEMICOLON)) - { - tree new_attrs; - c_parser_consume_token (parser); - mark_forward_parm_decls (); - new_attrs = c_parser_attributes (parser); - return c_parser_parms_list_declarator (parser, new_attrs); - } - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - { - c_parser_consume_token (parser); - if (good_parm) - return get_parm_info (false); - else - { - struct c_arg_info *ret - = XOBNEW (&parser_obstack, struct c_arg_info); - ret->parms = 0; - ret->tags = 0; - ret->types = 0; - ret->others = 0; - ret->pending_sizes = 0; - ret->had_vla_unspec = 0; - return ret; - } - } - if (!c_parser_require (parser, CPP_COMMA, - "expected %<;%>, %<,%> or %<)%>")) - { - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - return NULL; - } - if (c_parser_next_token_is (parser, CPP_ELLIPSIS)) - { - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - { - c_parser_consume_token (parser); - if (good_parm) - return get_parm_info (true); - else - { - struct c_arg_info *ret - = XOBNEW (&parser_obstack, struct c_arg_info); - ret->parms = 0; - ret->tags = 0; - ret->types = 0; - ret->others = 0; - ret->pending_sizes = 0; - ret->had_vla_unspec = 0; - return ret; - } - } - else - { - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - return NULL; - } - } - } -} - -/* Parse a parameter declaration. ATTRS are the attributes at the - start of the declaration if it is the first parameter. */ - -static struct c_parm * -c_parser_parameter_declaration (c_parser *parser, tree attrs) -{ - struct c_declspecs *specs; - struct c_declarator *declarator; - tree prefix_attrs; - tree postfix_attrs = NULL_TREE; - bool dummy = false; - if (!c_parser_next_token_starts_declspecs (parser)) - { - /* ??? In some Objective-C cases '...' isn't applicable so there - should be a different message. */ - c_parser_error (parser, - "expected declaration specifiers or %<...%>"); - c_parser_skip_to_end_of_parameter (parser); - return NULL; - } - specs = build_null_declspecs (); - if (attrs) - { - declspecs_add_attrs (specs, attrs); - attrs = NULL_TREE; - } - c_parser_declspecs (parser, specs, true, true, true); - finish_declspecs (specs); - pending_xref_error (); - prefix_attrs = specs->attrs; - specs->attrs = NULL_TREE; - declarator = c_parser_declarator (parser, specs->type_seen_p, - C_DTR_PARM, &dummy); - if (declarator == NULL) - { - c_parser_skip_until_found (parser, CPP_COMMA, NULL); - return NULL; - } - if (c_parser_next_token_is_keyword (parser, RID_ATTRIBUTE)) - postfix_attrs = c_parser_attributes (parser); - return build_c_parm (specs, chainon (postfix_attrs, prefix_attrs), - declarator); -} - -/* Parse a string literal in an asm expression. It should not be - translated, and wide string literals are an error although - permitted by the syntax. This is a GNU extension. - - asm-string-literal: - string-literal - - ??? At present, following the old parser, the caller needs to have - set c_lex_string_translate to 0. It would be better to follow the - C++ parser rather than using the c_lex_string_translate kludge. */ - -static tree -c_parser_asm_string_literal (c_parser *parser) -{ - tree str; - if (c_parser_next_token_is (parser, CPP_STRING)) - { - str = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - } - else if (c_parser_next_token_is (parser, CPP_WSTRING)) - { - error ("wide string literal in %<asm%>"); - str = build_string (1, ""); - c_parser_consume_token (parser); - } - else - { - c_parser_error (parser, "expected string literal"); - str = NULL_TREE; - } - return str; -} - -/* Parse a simple asm expression. This is used in restricted - contexts, where a full expression with inputs and outputs does not - make sense. This is a GNU extension. - - simple-asm-expr: - asm ( asm-string-literal ) -*/ - -static tree -c_parser_simple_asm_expr (c_parser *parser) -{ - tree str; - gcc_assert (c_parser_next_token_is_keyword (parser, RID_ASM)); - /* ??? Follow the C++ parser rather than using the - c_lex_string_translate kludge. */ - c_lex_string_translate = 0; - c_parser_consume_token (parser); - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - c_lex_string_translate = 1; - return NULL_TREE; - } - str = c_parser_asm_string_literal (parser); - c_lex_string_translate = 1; - if (!c_parser_require (parser, CPP_CLOSE_PAREN, "expected %<)%>")) - { - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - return NULL_TREE; - } - return str; -} - -/* Parse (possibly empty) attributes. This is a GNU extension. - - attributes: - empty - attributes attribute - - attribute: - __attribute__ ( ( attribute-list ) ) - - attribute-list: - attrib - attribute_list , attrib - - attrib: - empty - any-word - any-word ( identifier ) - any-word ( identifier , nonempty-expr-list ) - any-word ( expr-list ) - - where the "identifier" must not be declared as a type, and - "any-word" may be any identifier (including one declared as a - type), a reserved word storage class specifier, type specifier or - type qualifier. ??? This still leaves out most reserved keywords - (following the old parser), shouldn't we include them, and why not - allow identifiers declared as types to start the arguments? */ - -static tree -c_parser_attributes (c_parser *parser) -{ - tree attrs = NULL_TREE; - while (c_parser_next_token_is_keyword (parser, RID_ATTRIBUTE)) - { - /* ??? Follow the C++ parser rather than using the - c_lex_string_translate kludge. */ - c_lex_string_translate = 0; - c_parser_consume_token (parser); - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - c_lex_string_translate = 1; - return attrs; - } - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - c_lex_string_translate = 1; - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - return attrs; - } - /* Parse the attribute list. */ - while (c_parser_next_token_is (parser, CPP_COMMA) - || c_parser_next_token_is (parser, CPP_NAME) - || c_parser_next_token_is (parser, CPP_KEYWORD)) - { - tree attr, attr_name, attr_args; - if (c_parser_next_token_is (parser, CPP_COMMA)) - { - c_parser_consume_token (parser); - continue; - } - if (c_parser_next_token_is (parser, CPP_KEYWORD)) - { - /* ??? See comment above about what keywords are - accepted here. */ - bool ok; - switch (c_parser_peek_token (parser)->keyword) - { - case RID_STATIC: - case RID_UNSIGNED: - case RID_LONG: - case RID_CONST: - case RID_EXTERN: - case RID_REGISTER: - case RID_TYPEDEF: - case RID_SHORT: - case RID_INLINE: - case RID_VOLATILE: - case RID_SIGNED: - case RID_AUTO: - case RID_RESTRICT: - case RID_COMPLEX: - case RID_THREAD: - case RID_INT: - case RID_CHAR: - case RID_FLOAT: - case RID_DOUBLE: - case RID_VOID: - case RID_DFLOAT32: - case RID_DFLOAT64: - case RID_DFLOAT128: - case RID_BOOL: - ok = true; - break; - default: - ok = false; - break; - } - if (!ok) - break; - } - attr_name = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - if (c_parser_next_token_is_not (parser, CPP_OPEN_PAREN)) - { - attr = build_tree_list (attr_name, NULL_TREE); - attrs = chainon (attrs, attr); - continue; - } - c_parser_consume_token (parser); - /* Parse the attribute contents. If they start with an - identifier which is followed by a comma or close - parenthesis, then the arguments start with that - identifier; otherwise they are an expression list. */ - if (c_parser_next_token_is (parser, CPP_NAME) - && c_parser_peek_token (parser)->id_kind == C_ID_ID - && ((c_parser_peek_2nd_token (parser)->type == CPP_COMMA) - || (c_parser_peek_2nd_token (parser)->type - == CPP_CLOSE_PAREN))) - { - tree arg1 = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - attr_args = build_tree_list (NULL_TREE, arg1); - else - { - c_parser_consume_token (parser); - attr_args = tree_cons (NULL_TREE, arg1, - c_parser_expr_list (parser, false)); - } - } - else - { - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - attr_args = NULL_TREE; - else - attr_args = c_parser_expr_list (parser, false); - } - attr = build_tree_list (attr_name, attr_args); - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - c_parser_consume_token (parser); - else - { - c_lex_string_translate = 1; - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - return attrs; - } - attrs = chainon (attrs, attr); - } - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - c_parser_consume_token (parser); - else - { - c_lex_string_translate = 1; - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - return attrs; - } - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - c_parser_consume_token (parser); - else - { - c_lex_string_translate = 1; - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - return attrs; - } - c_lex_string_translate = 1; - } - return attrs; -} - -/* Parse a type name (C90 6.5.5, C99 6.7.6). - - type-name: - specifier-qualifier-list abstract-declarator[opt] -*/ - -static struct c_type_name * -c_parser_type_name (c_parser *parser) -{ - struct c_declspecs *specs = build_null_declspecs (); - struct c_declarator *declarator; - struct c_type_name *ret; - bool dummy = false; - c_parser_declspecs (parser, specs, false, true, true); - if (!specs->declspecs_seen_p) - { - c_parser_error (parser, "expected specifier-qualifier-list"); - return NULL; - } - pending_xref_error (); - finish_declspecs (specs); - declarator = c_parser_declarator (parser, specs->type_seen_p, - C_DTR_ABSTRACT, &dummy); - if (declarator == NULL) - return NULL; - ret = XOBNEW (&parser_obstack, struct c_type_name); - ret->specs = specs; - ret->declarator = declarator; - return ret; -} - -/* Parse an initializer (C90 6.5.7, C99 6.7.8). - - initializer: - assignment-expression - { initializer-list } - { initializer-list , } - - initializer-list: - designation[opt] initializer - initializer-list , designation[opt] initializer - - designation: - designator-list = - - designator-list: - designator - designator-list designator - - designator: - array-designator - . identifier - - array-designator: - [ constant-expression ] - - GNU extensions: - - initializer: - { } - - designation: - array-designator - identifier : - - array-designator: - [ constant-expression ... constant-expression ] - - Any expression without commas is accepted in the syntax for the - constant-expressions, with non-constant expressions rejected later. - - This function is only used for top-level initializers; for nested - ones, see c_parser_initval. */ - -static struct c_expr -c_parser_initializer (c_parser *parser) -{ - if (c_parser_next_token_is (parser, CPP_OPEN_BRACE)) - return c_parser_braced_init (parser, NULL_TREE, false); - else - { - struct c_expr ret; - ret = c_parser_expr_no_commas (parser, NULL); - if (TREE_CODE (ret.value) != STRING_CST - && TREE_CODE (ret.value) != COMPOUND_LITERAL_EXPR) - ret = default_function_array_conversion (ret); - return ret; - } -} - -/* Parse a braced initializer list. TYPE is the type specified for a - compound literal, and NULL_TREE for other initializers and for - nested braced lists. NESTED_P is true for nested braced lists, - false for the list of a compound literal or the list that is the - top-level initializer in a declaration. */ - -static struct c_expr -c_parser_braced_init (c_parser *parser, tree type, bool nested_p) -{ - gcc_assert (c_parser_next_token_is (parser, CPP_OPEN_BRACE)); - c_parser_consume_token (parser); - if (nested_p) - push_init_level (0); - else - really_start_incremental_init (type); - if (c_parser_next_token_is (parser, CPP_CLOSE_BRACE)) - { - if (pedantic) - pedwarn ("ISO C forbids empty initializer braces"); - } - else - { - /* Parse a non-empty initializer list, possibly with a trailing - comma. */ - while (true) - { - c_parser_initelt (parser); - if (parser->error) - break; - if (c_parser_next_token_is (parser, CPP_COMMA)) - c_parser_consume_token (parser); - else - break; - if (c_parser_next_token_is (parser, CPP_CLOSE_BRACE)) - break; - } - } - if (c_parser_next_token_is_not (parser, CPP_CLOSE_BRACE)) - { - struct c_expr ret; - ret.value = error_mark_node; - ret.original_code = ERROR_MARK; - c_parser_skip_until_found (parser, CPP_CLOSE_BRACE, "expected %<}%>"); - return ret; - } - c_parser_consume_token (parser); - return pop_init_level (0); -} - -/* Parse a nested initializer, including designators. */ - -static void -c_parser_initelt (c_parser *parser) -{ - /* Parse any designator or designator list. A single array - designator may have the subsequent "=" omitted in GNU C, but a - longer list or a structure member designator may not. */ - if (c_parser_next_token_is (parser, CPP_NAME) - && c_parser_peek_2nd_token (parser)->type == CPP_COLON) - { - /* Old-style structure member designator. */ - set_init_label (c_parser_peek_token (parser)->value); - if (pedantic) - pedwarn ("obsolete use of designated initializer with %<:%>"); - c_parser_consume_token (parser); - c_parser_consume_token (parser); - } - else - { - /* des_seen is 0 if there have been no designators, 1 if there - has been a single array designator and 2 otherwise. */ - int des_seen = 0; - while (c_parser_next_token_is (parser, CPP_OPEN_SQUARE) - || c_parser_next_token_is (parser, CPP_DOT)) - { - int des_prev = des_seen; - if (des_seen < 2) - des_seen++; - if (c_parser_next_token_is (parser, CPP_DOT)) - { - des_seen = 2; - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_NAME)) - { - set_init_label (c_parser_peek_token (parser)->value); - c_parser_consume_token (parser); - } - else - { - struct c_expr init; - init.value = error_mark_node; - init.original_code = ERROR_MARK; - c_parser_error (parser, "expected identifier"); - c_parser_skip_until_found (parser, CPP_COMMA, NULL); - process_init_element (init); - return; - } - } - else - { - tree first, second; - /* ??? Following the old parser, [ objc-receiver - objc-message-args ] is accepted as an initializer, - being distinguished from a designator by what follows - the first assignment expression inside the square - brackets, but after a first array designator a - subsequent square bracket is for Objective-C taken to - start an expression, using the obsolete form of - designated initializer without '=', rather than - possibly being a second level of designation: in LALR - terms, the '[' is shifted rather than reducing - designator to designator-list. */ - if (des_prev == 1 && c_dialect_objc ()) - { - des_seen = des_prev; - break; - } - if (des_prev == 0 && c_dialect_objc ()) - { - /* This might be an array designator or an - Objective-C message expression. If the former, - continue parsing here; if the latter, parse the - remainder of the initializer given the starting - primary-expression. ??? It might make sense to - distinguish when des_prev == 1 as well; see - previous comment. */ - tree rec, args; - struct c_expr mexpr; - c_parser_consume_token (parser); - if (c_parser_peek_token (parser)->type == CPP_NAME - && ((c_parser_peek_token (parser)->id_kind - == C_ID_TYPENAME) - || (c_parser_peek_token (parser)->id_kind - == C_ID_CLASSNAME))) - { - /* Type name receiver. */ - tree id = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - rec = objc_get_class_reference (id); - goto parse_message_args; - } - first = c_parser_expr_no_commas (parser, NULL).value; - if (c_parser_next_token_is (parser, CPP_ELLIPSIS) - || c_parser_next_token_is (parser, CPP_CLOSE_SQUARE)) - goto array_desig_after_first; - /* Expression receiver. So far only one part - without commas has been parsed; there might be - more of the expression. */ - rec = first; - while (c_parser_next_token_is (parser, CPP_COMMA)) - { - struct c_expr next; - c_parser_consume_token (parser); - next = c_parser_expr_no_commas (parser, NULL); - next = default_function_array_conversion (next); - rec = build_compound_expr (rec, next.value); - } - parse_message_args: - /* Now parse the objc-message-args. */ - args = c_parser_objc_message_args (parser); - c_parser_skip_until_found (parser, CPP_CLOSE_SQUARE, - "expected %<]%>"); - mexpr.value - = objc_build_message_expr (build_tree_list (rec, args)); - mexpr.original_code = ERROR_MARK; - /* Now parse and process the remainder of the - initializer, starting with this message - expression as a primary-expression. */ - c_parser_initval (parser, &mexpr); - return; - } - c_parser_consume_token (parser); - first = c_parser_expr_no_commas (parser, NULL).value; - array_desig_after_first: - if (c_parser_next_token_is (parser, CPP_ELLIPSIS)) - { - c_parser_consume_token (parser); - second = c_parser_expr_no_commas (parser, NULL).value; - } - else - second = NULL_TREE; - if (c_parser_next_token_is (parser, CPP_CLOSE_SQUARE)) - { - c_parser_consume_token (parser); - set_init_index (first, second); - if (pedantic && second) - pedwarn ("ISO C forbids specifying range of " - "elements to initialize"); - } - else - c_parser_skip_until_found (parser, CPP_CLOSE_SQUARE, - "expected %<]%>"); - } - } - if (des_seen >= 1) - { - if (c_parser_next_token_is (parser, CPP_EQ)) - { - if (pedantic && !flag_isoc99) - pedwarn ("ISO C90 forbids specifying subobject to initialize"); - c_parser_consume_token (parser); - } - else - { - if (des_seen == 1) - { - if (pedantic) - pedwarn ("obsolete use of designated initializer " - "without %<=%>"); - } - else - { - struct c_expr init; - init.value = error_mark_node; - init.original_code = ERROR_MARK; - c_parser_error (parser, "expected %<=%>"); - c_parser_skip_until_found (parser, CPP_COMMA, NULL); - process_init_element (init); - return; - } - } - } - } - c_parser_initval (parser, NULL); -} - -/* Parse a nested initializer; as c_parser_initializer but parses - initializers within braced lists, after any designators have been - applied. If AFTER is not NULL then it is an Objective-C message - expression which is the primary-expression starting the - initializer. */ - -static void -c_parser_initval (c_parser *parser, struct c_expr *after) -{ - struct c_expr init; - gcc_assert (!after || c_dialect_objc ()); - if (c_parser_next_token_is (parser, CPP_OPEN_BRACE) && !after) - init = c_parser_braced_init (parser, NULL_TREE, true); - else - { - init = c_parser_expr_no_commas (parser, after); - if (init.value != NULL_TREE - && TREE_CODE (init.value) != STRING_CST - && TREE_CODE (init.value) != COMPOUND_LITERAL_EXPR) - init = default_function_array_conversion (init); - } - process_init_element (init); -} - -/* Parse a compound statement (possibly a function body) (C90 6.6.2, - C99 6.8.2). - - compound-statement: - { block-item-list[opt] } - { label-declarations block-item-list } - - block-item-list: - block-item - block-item-list block-item - - block-item: - nested-declaration - statement - - nested-declaration: - declaration - - GNU extensions: - - compound-statement: - { label-declarations block-item-list } - - nested-declaration: - __extension__ nested-declaration - nested-function-definition - - label-declarations: - label-declaration - label-declarations label-declaration - - label-declaration: - __label__ identifier-list ; - - Allowing the mixing of declarations and code is new in C99. The - GNU syntax also permits (not shown above) labels at the end of - compound statements, which yield an error. We don't allow labels - on declarations; this might seem like a natural extension, but - there would be a conflict between attributes on the label and - prefix attributes on the declaration. ??? The syntax follows the - old parser in requiring something after label declarations. - Although they are erroneous if the labels declared aren't defined, - is it useful for the syntax to be this way? - - OpenMP: - - block-item: - openmp-directive - - openmp-directive: - barrier-directive - flush-directive */ - -static tree -c_parser_compound_statement (c_parser *parser) -{ - tree stmt; - if (!c_parser_require (parser, CPP_OPEN_BRACE, "expected %<{%>")) - return error_mark_node; - stmt = c_begin_compound_stmt (true); - c_parser_compound_statement_nostart (parser); - return c_end_compound_stmt (stmt, true); -} - -/* Parse a compound statement except for the opening brace. This is - used for parsing both compound statements and statement expressions - (which follow different paths to handling the opening). */ - -static void -c_parser_compound_statement_nostart (c_parser *parser) -{ - bool last_stmt = false; - bool last_label = false; - if (c_parser_next_token_is (parser, CPP_CLOSE_BRACE)) - { - c_parser_consume_token (parser); - return; - } - if (c_parser_next_token_is_keyword (parser, RID_LABEL)) - { - /* Read zero or more forward-declarations for labels that nested - functions can jump to. */ - while (c_parser_next_token_is_keyword (parser, RID_LABEL)) - { - c_parser_consume_token (parser); - /* Any identifiers, including those declared as type names, - are OK here. */ - while (true) - { - tree label; - if (c_parser_next_token_is_not (parser, CPP_NAME)) - { - c_parser_error (parser, "expected identifier"); - break; - } - label - = declare_label (c_parser_peek_token (parser)->value); - C_DECLARED_LABEL_FLAG (label) = 1; - add_stmt (build_stmt (DECL_EXPR, label)); - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_COMMA)) - c_parser_consume_token (parser); - else - break; - } - c_parser_skip_until_found (parser, CPP_SEMICOLON, "expected %<;%>"); - } - /* ??? Locating this diagnostic on the token after the - declarations end follows the old parser, but it might be - better to locate it where the declarations start instead. */ - if (pedantic) - pedwarn ("ISO C forbids label declarations"); - } - /* We must now have at least one statement, label or declaration. */ - if (c_parser_next_token_is (parser, CPP_CLOSE_BRACE)) - { - c_parser_error (parser, "expected declaration or statement"); - c_parser_consume_token (parser); - return; - } - while (c_parser_next_token_is_not (parser, CPP_CLOSE_BRACE)) - { - location_t loc = c_parser_peek_token (parser)->location; - if (c_parser_next_token_is_keyword (parser, RID_CASE) - || c_parser_next_token_is_keyword (parser, RID_DEFAULT) - || (c_parser_next_token_is (parser, CPP_NAME) - && c_parser_peek_2nd_token (parser)->type == CPP_COLON)) - { - last_label = true; - last_stmt = false; - c_parser_label (parser); - } - else if (!last_label - && c_parser_next_token_starts_declspecs (parser)) - { - last_label = false; - c_parser_declaration_or_fndef (parser, true, true, true, true); - if (last_stmt - && ((pedantic && !flag_isoc99) - || warn_declaration_after_statement)) - pedwarn_c90 ("%HISO C90 forbids mixed declarations and code", - &loc); - last_stmt = false; - } - else if (!last_label - && c_parser_next_token_is_keyword (parser, RID_EXTENSION)) - { - /* __extension__ can start a declaration, but is also an - unary operator that can start an expression. Consume all - but the last of a possible series of __extension__ to - determine which. */ - while (c_parser_peek_2nd_token (parser)->type == CPP_KEYWORD - && (c_parser_peek_2nd_token (parser)->keyword - == RID_EXTENSION)) - c_parser_consume_token (parser); - if (c_token_starts_declspecs (c_parser_peek_2nd_token (parser))) - { - int ext; - ext = disable_extension_diagnostics (); - c_parser_consume_token (parser); - last_label = false; - c_parser_declaration_or_fndef (parser, true, true, true, true); - /* Following the old parser, __extension__ does not - disable this diagnostic. */ - restore_extension_diagnostics (ext); - if (last_stmt - && ((pedantic && !flag_isoc99) - || warn_declaration_after_statement)) - pedwarn_c90 ("%HISO C90 forbids mixed declarations and code", - &loc); - last_stmt = false; - } - else - goto statement; - } - else if (c_parser_next_token_is (parser, CPP_PRAGMA)) - { - /* External pragmas, and some omp pragmas, are not associated - with regular c code, and so are not to be considered statements - syntactically. This ensures that the user doesn't put them - places that would turn into syntax errors if the directive - were ignored. */ - if (c_parser_pragma (parser, pragma_compound)) - last_label = false, last_stmt = true; - } - else if (c_parser_next_token_is (parser, CPP_EOF)) - { - c_parser_error (parser, "expected declaration or statement"); - return; - } - else - { - statement: - last_label = false; - last_stmt = true; - c_parser_statement_after_labels (parser); - } - - parser->error = false; - } - if (last_label) - error ("label at end of compound statement"); - c_parser_consume_token (parser); -} - -/* Parse a label (C90 6.6.1, C99 6.8.1). - - label: - identifier : attributes[opt] - case constant-expression : - default : - - GNU extensions: - - label: - case constant-expression ... constant-expression : - - The use of attributes on labels is a GNU extension. The syntax in - GNU C accepts any expressions without commas, non-constant - expressions being rejected later. */ - -static void -c_parser_label (c_parser *parser) -{ - location_t loc1 = c_parser_peek_token (parser)->location; - tree label = NULL_TREE; - if (c_parser_next_token_is_keyword (parser, RID_CASE)) - { - tree exp1, exp2; - c_parser_consume_token (parser); - exp1 = c_parser_expr_no_commas (parser, NULL).value; - if (c_parser_next_token_is (parser, CPP_COLON)) - { - c_parser_consume_token (parser); - label = do_case (exp1, NULL_TREE); - } - else if (c_parser_next_token_is (parser, CPP_ELLIPSIS)) - { - c_parser_consume_token (parser); - exp2 = c_parser_expr_no_commas (parser, NULL).value; - if (c_parser_require (parser, CPP_COLON, "expected %<:%>")) - label = do_case (exp1, exp2); - } - else - c_parser_error (parser, "expected %<:%> or %<...%>"); - } - else if (c_parser_next_token_is_keyword (parser, RID_DEFAULT)) - { - c_parser_consume_token (parser); - if (c_parser_require (parser, CPP_COLON, "expected %<:%>")) - label = do_case (NULL_TREE, NULL_TREE); - } - else - { - tree name = c_parser_peek_token (parser)->value; - tree tlab; - location_t loc2; - tree attrs; - gcc_assert (c_parser_next_token_is (parser, CPP_NAME)); - c_parser_consume_token (parser); - gcc_assert (c_parser_next_token_is (parser, CPP_COLON)); - loc2 = c_parser_peek_token (parser)->location; - c_parser_consume_token (parser); - attrs = c_parser_attributes (parser); - tlab = define_label (loc2, name); - if (tlab) - { - decl_attributes (&tlab, attrs, 0); - label = add_stmt (build_stmt (LABEL_EXPR, tlab)); - } - } - if (label) - SET_EXPR_LOCATION (label, loc1); -} - -/* Parse a statement (C90 6.6, C99 6.8). - - statement: - labeled-statement - compound-statement - expression-statement - selection-statement - iteration-statement - jump-statement - - labeled-statement: - label statement - - expression-statement: - expression[opt] ; - - selection-statement: - if-statement - switch-statement - - iteration-statement: - while-statement - do-statement - for-statement - - jump-statement: - goto identifier ; - continue ; - break ; - return expression[opt] ; - - GNU extensions: - - statement: - asm-statement - - jump-statement: - goto * expression ; - - Objective-C: - - statement: - objc-throw-statement - objc-try-catch-statement - objc-synchronized-statement - - objc-throw-statement: - @throw expression ; - @throw ; - - OpenMP: - - statement: - openmp-construct - - openmp-construct: - parallel-construct - for-construct - sections-construct - single-construct - parallel-for-construct - parallel-sections-construct - master-construct - critical-construct - atomic-construct - ordered-construct - - parallel-construct: - parallel-directive structured-block - - for-construct: - for-directive iteration-statement - - sections-construct: - sections-directive section-scope - - single-construct: - single-directive structured-block - - parallel-for-construct: - parallel-for-directive iteration-statement - - parallel-sections-construct: - parallel-sections-directive section-scope - - master-construct: - master-directive structured-block - - critical-construct: - critical-directive structured-block - - atomic-construct: - atomic-directive expression-statement - - ordered-construct: - ordered-directive structured-block */ - -static void -c_parser_statement (c_parser *parser) -{ - while (c_parser_next_token_is_keyword (parser, RID_CASE) - || c_parser_next_token_is_keyword (parser, RID_DEFAULT) - || (c_parser_next_token_is (parser, CPP_NAME) - && c_parser_peek_2nd_token (parser)->type == CPP_COLON)) - c_parser_label (parser); - c_parser_statement_after_labels (parser); -} - -/* Parse a statement, other than a labeled statement. */ - -static void -c_parser_statement_after_labels (c_parser *parser) -{ - location_t loc = c_parser_peek_token (parser)->location; - tree stmt = NULL_TREE; - switch (c_parser_peek_token (parser)->type) - { - case CPP_OPEN_BRACE: - add_stmt (c_parser_compound_statement (parser)); - break; - case CPP_KEYWORD: - switch (c_parser_peek_token (parser)->keyword) - { - case RID_IF: - c_parser_if_statement (parser); - break; - case RID_SWITCH: - c_parser_switch_statement (parser); - break; - case RID_WHILE: - c_parser_while_statement (parser); - break; - case RID_DO: - c_parser_do_statement (parser); - break; - case RID_FOR: - c_parser_for_statement (parser); - break; - case RID_GOTO: - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_NAME)) - { - stmt = c_finish_goto_label (c_parser_peek_token (parser)->value); - c_parser_consume_token (parser); - } - else if (c_parser_next_token_is (parser, CPP_MULT)) - { - c_parser_consume_token (parser); - stmt = c_finish_goto_ptr (c_parser_expression (parser).value); - } - else - c_parser_error (parser, "expected identifier or %<*%>"); - goto expect_semicolon; - case RID_CONTINUE: - c_parser_consume_token (parser); - stmt = c_finish_bc_stmt (&c_cont_label, false); - goto expect_semicolon; - case RID_BREAK: - c_parser_consume_token (parser); - stmt = c_finish_bc_stmt (&c_break_label, true); - goto expect_semicolon; - case RID_RETURN: - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_SEMICOLON)) - { - stmt = c_finish_return (NULL_TREE); - c_parser_consume_token (parser); - } - else - { - stmt = c_finish_return (c_parser_expression_conv (parser).value); - goto expect_semicolon; - } - break; - case RID_ASM: - stmt = c_parser_asm_statement (parser); - break; - case RID_AT_THROW: - gcc_assert (c_dialect_objc ()); - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_SEMICOLON)) - { - stmt = objc_build_throw_stmt (NULL_TREE); - c_parser_consume_token (parser); - } - else - { - stmt - = objc_build_throw_stmt (c_parser_expression (parser).value); - goto expect_semicolon; - } - break; - case RID_AT_TRY: - gcc_assert (c_dialect_objc ()); - c_parser_objc_try_catch_statement (parser); - break; - case RID_AT_SYNCHRONIZED: - gcc_assert (c_dialect_objc ()); - c_parser_objc_synchronized_statement (parser); - break; - default: - goto expr_stmt; - } - break; - case CPP_SEMICOLON: - c_parser_consume_token (parser); - break; - case CPP_CLOSE_PAREN: - case CPP_CLOSE_SQUARE: - /* Avoid infinite loop in error recovery: - c_parser_skip_until_found stops at a closing nesting - delimiter without consuming it, but here we need to consume - it to proceed further. */ - c_parser_error (parser, "expected statement"); - c_parser_consume_token (parser); - break; - case CPP_PRAGMA: - c_parser_pragma (parser, pragma_stmt); - break; - default: - expr_stmt: - stmt = c_finish_expr_stmt (c_parser_expression_conv (parser).value); - expect_semicolon: - c_parser_skip_until_found (parser, CPP_SEMICOLON, "expected %<;%>"); - break; - } - /* Two cases cannot and do not have line numbers associated: If stmt - is degenerate, such as "2;", then stmt is an INTEGER_CST, which - cannot hold line numbers. But that's OK because the statement - will either be changed to a MODIFY_EXPR during gimplification of - the statement expr, or discarded. If stmt was compound, but - without new variables, we will have skipped the creation of a - BIND and will have a bare STATEMENT_LIST. But that's OK because - (recursively) all of the component statements should already have - line numbers assigned. ??? Can we discard no-op statements - earlier? */ - if (stmt && EXPR_P (stmt)) - SET_EXPR_LOCATION (stmt, loc); -} - -/* Parse a parenthesized condition from an if, do or while statement. - - condition: - ( expression ) -*/ -static tree -c_parser_paren_condition (c_parser *parser) -{ - location_t loc; - tree cond; - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - return error_mark_node; - loc = c_parser_peek_token (parser)->location; - cond = c_objc_common_truthvalue_conversion - (c_parser_expression_conv (parser).value); - if (EXPR_P (cond)) - SET_EXPR_LOCATION (cond, loc); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - return cond; -} - -/* Parse a statement which is a block in C99. */ - -static tree -c_parser_c99_block_statement (c_parser *parser) -{ - tree block = c_begin_compound_stmt (flag_isoc99); - c_parser_statement (parser); - return c_end_compound_stmt (block, flag_isoc99); -} - -/* Parse the body of an if statement or the else half thereof. This - is just parsing a statement but (a) it is a block in C99, (b) we - track whether the body is an if statement for the sake of - -Wparentheses warnings, (c) we handle an empty body specially for - the sake of -Wextra warnings. */ - -static tree -c_parser_if_body (c_parser *parser, bool *if_p) -{ - tree block = c_begin_compound_stmt (flag_isoc99); - while (c_parser_next_token_is_keyword (parser, RID_CASE) - || c_parser_next_token_is_keyword (parser, RID_DEFAULT) - || (c_parser_next_token_is (parser, CPP_NAME) - && c_parser_peek_2nd_token (parser)->type == CPP_COLON)) - c_parser_label (parser); - *if_p = c_parser_next_token_is_keyword (parser, RID_IF); - if (extra_warnings && c_parser_next_token_is (parser, CPP_SEMICOLON)) - add_stmt (build_empty_stmt ()); - c_parser_statement_after_labels (parser); - return c_end_compound_stmt (block, flag_isoc99); -} - -/* Parse an if statement (C90 6.6.4, C99 6.8.4). - - if-statement: - if ( expression ) statement - if ( expression ) statement else statement -*/ - -static void -c_parser_if_statement (c_parser *parser) -{ - tree block; - location_t loc; - tree cond; - bool first_if = false, second_if = false; - tree first_body, second_body; - gcc_assert (c_parser_next_token_is_keyword (parser, RID_IF)); - c_parser_consume_token (parser); - block = c_begin_compound_stmt (flag_isoc99); - loc = c_parser_peek_token (parser)->location; - cond = c_parser_paren_condition (parser); - first_body = c_parser_if_body (parser, &first_if); - if (c_parser_next_token_is_keyword (parser, RID_ELSE)) - { - c_parser_consume_token (parser); - second_body = c_parser_if_body (parser, &second_if); - } - else - second_body = NULL_TREE; - c_finish_if_stmt (loc, cond, first_body, second_body, first_if); - add_stmt (c_end_compound_stmt (block, flag_isoc99)); -} - -/* Parse a switch statement (C90 6.6.4, C99 6.8.4). - - switch-statement: - switch (expression) statement -*/ - -static void -c_parser_switch_statement (c_parser *parser) -{ - tree block, expr, body, save_break; - gcc_assert (c_parser_next_token_is_keyword (parser, RID_SWITCH)); - c_parser_consume_token (parser); - block = c_begin_compound_stmt (flag_isoc99); - if (c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - expr = c_parser_expression (parser).value; - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - } - else - expr = error_mark_node; - c_start_case (expr); - save_break = c_break_label; - c_break_label = NULL_TREE; - body = c_parser_c99_block_statement (parser); - c_finish_case (body); - if (c_break_label) - add_stmt (build1 (LABEL_EXPR, void_type_node, c_break_label)); - c_break_label = save_break; - add_stmt (c_end_compound_stmt (block, flag_isoc99)); -} - -/* Parse a while statement (C90 6.6.5, C99 6.8.5). - - while-statement: - while (expression) statement -*/ - -static void -c_parser_while_statement (c_parser *parser) -{ - tree block, cond, body, save_break, save_cont; - location_t loc; - gcc_assert (c_parser_next_token_is_keyword (parser, RID_WHILE)); - c_parser_consume_token (parser); - block = c_begin_compound_stmt (flag_isoc99); - loc = c_parser_peek_token (parser)->location; - cond = c_parser_paren_condition (parser); - save_break = c_break_label; - c_break_label = NULL_TREE; - save_cont = c_cont_label; - c_cont_label = NULL_TREE; - body = c_parser_c99_block_statement (parser); - c_finish_loop (loc, cond, NULL, body, c_break_label, c_cont_label, true); - add_stmt (c_end_compound_stmt (block, flag_isoc99)); - c_break_label = save_break; - c_cont_label = save_cont; -} - -/* Parse a do statement (C90 6.6.5, C99 6.8.5). - - do-statement: - do statement while ( expression ) ; -*/ - -static void -c_parser_do_statement (c_parser *parser) -{ - tree block, cond, body, save_break, save_cont, new_break, new_cont; - location_t loc; - gcc_assert (c_parser_next_token_is_keyword (parser, RID_DO)); - c_parser_consume_token (parser); - block = c_begin_compound_stmt (flag_isoc99); - loc = c_parser_peek_token (parser)->location; - save_break = c_break_label; - c_break_label = NULL_TREE; - save_cont = c_cont_label; - c_cont_label = NULL_TREE; - body = c_parser_c99_block_statement (parser); - c_parser_require_keyword (parser, RID_WHILE, "expected %<while%>"); - new_break = c_break_label; - c_break_label = save_break; - new_cont = c_cont_label; - c_cont_label = save_cont; - cond = c_parser_paren_condition (parser); - if (!c_parser_require (parser, CPP_SEMICOLON, "expected %<;%>")) - c_parser_skip_to_end_of_block_or_statement (parser); - c_finish_loop (loc, cond, NULL, body, new_break, new_cont, false); - add_stmt (c_end_compound_stmt (block, flag_isoc99)); -} - -/* Parse a for statement (C90 6.6.5, C99 6.8.5). - - for-statement: - for ( expression[opt] ; expression[opt] ; expression[opt] ) statement - for ( nested-declaration expression[opt] ; expression[opt] ) statement - - The form with a declaration is new in C99. - - ??? In accordance with the old parser, the declaration may be a - nested function, which is then rejected in check_for_loop_decls, - but does it make any sense for this to be included in the grammar? - Note in particular that the nested function does not include a - trailing ';', whereas the "declaration" production includes one. - Also, can we reject bad declarations earlier and cheaper than - check_for_loop_decls? */ - -static void -c_parser_for_statement (c_parser *parser) -{ - tree block, cond, incr, save_break, save_cont, body; - location_t loc; - gcc_assert (c_parser_next_token_is_keyword (parser, RID_FOR)); - loc = c_parser_peek_token (parser)->location; - c_parser_consume_token (parser); - block = c_begin_compound_stmt (flag_isoc99); - if (c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - /* Parse the initialization declaration or expression. */ - if (c_parser_next_token_is (parser, CPP_SEMICOLON)) - { - c_parser_consume_token (parser); - c_finish_expr_stmt (NULL_TREE); - } - else if (c_parser_next_token_starts_declspecs (parser)) - { - c_parser_declaration_or_fndef (parser, true, true, true, true); - check_for_loop_decls (); - } - else if (c_parser_next_token_is_keyword (parser, RID_EXTENSION)) - { - /* __extension__ can start a declaration, but is also an - unary operator that can start an expression. Consume all - but the last of a possible series of __extension__ to - determine which. */ - while (c_parser_peek_2nd_token (parser)->type == CPP_KEYWORD - && (c_parser_peek_2nd_token (parser)->keyword - == RID_EXTENSION)) - c_parser_consume_token (parser); - if (c_token_starts_declspecs (c_parser_peek_2nd_token (parser))) - { - int ext; - ext = disable_extension_diagnostics (); - c_parser_consume_token (parser); - c_parser_declaration_or_fndef (parser, true, true, true, true); - restore_extension_diagnostics (ext); - check_for_loop_decls (); - } - else - goto init_expr; - } - else - { - init_expr: - c_finish_expr_stmt (c_parser_expression (parser).value); - c_parser_skip_until_found (parser, CPP_SEMICOLON, "expected %<;%>"); - } - /* Parse the loop condition. */ - loc = c_parser_peek_token (parser)->location; - if (c_parser_next_token_is (parser, CPP_SEMICOLON)) - { - c_parser_consume_token (parser); - cond = NULL_TREE; - } - else - { - tree ocond = c_parser_expression_conv (parser).value; - cond = c_objc_common_truthvalue_conversion (ocond); - if (EXPR_P (cond)) - SET_EXPR_LOCATION (cond, loc); - c_parser_skip_until_found (parser, CPP_SEMICOLON, "expected %<;%>"); - } - /* Parse the increment expression. */ - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - incr = c_process_expr_stmt (NULL_TREE); - else - incr = c_process_expr_stmt (c_parser_expression (parser).value); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - } - else - { - cond = error_mark_node; - incr = error_mark_node; - } - save_break = c_break_label; - c_break_label = NULL_TREE; - save_cont = c_cont_label; - c_cont_label = NULL_TREE; - body = c_parser_c99_block_statement (parser); - c_finish_loop (loc, cond, incr, body, c_break_label, c_cont_label, true); - add_stmt (c_end_compound_stmt (block, flag_isoc99)); - c_break_label = save_break; - c_cont_label = save_cont; -} - -/* Parse an asm statement, a GNU extension. This is a full-blown asm - statement with inputs, outputs, clobbers, and volatile tag - allowed. - - asm-statement: - asm type-qualifier[opt] ( asm-argument ) ; - - asm-argument: - asm-string-literal - asm-string-literal : asm-operands[opt] - asm-string-literal : asm-operands[opt] : asm-operands[opt] - asm-string-literal : asm-operands[opt] : asm-operands[opt] : asm-clobbers - - Qualifiers other than volatile are accepted in the syntax but - warned for. */ - -static tree -c_parser_asm_statement (c_parser *parser) -{ - tree quals, str, outputs, inputs, clobbers, ret; - bool simple; - gcc_assert (c_parser_next_token_is_keyword (parser, RID_ASM)); - c_parser_consume_token (parser); - if (c_parser_next_token_is_keyword (parser, RID_VOLATILE)) - { - quals = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - } - else if (c_parser_next_token_is_keyword (parser, RID_CONST) - || c_parser_next_token_is_keyword (parser, RID_RESTRICT)) - { - warning (0, "%E qualifier ignored on asm", - c_parser_peek_token (parser)->value); - quals = NULL_TREE; - c_parser_consume_token (parser); - } - else - quals = NULL_TREE; - /* ??? Follow the C++ parser rather than using the - c_lex_string_translate kludge. */ - c_lex_string_translate = 0; - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - c_lex_string_translate = 1; - return NULL_TREE; - } - str = c_parser_asm_string_literal (parser); - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - { - simple = true; - outputs = NULL_TREE; - inputs = NULL_TREE; - clobbers = NULL_TREE; - goto done_asm; - } - if (!c_parser_require (parser, CPP_COLON, "expected %<:%> or %<)%>")) - { - c_lex_string_translate = 1; - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - return NULL_TREE; - } - simple = false; - /* Parse outputs. */ - if (c_parser_next_token_is (parser, CPP_COLON) - || c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - outputs = NULL_TREE; - else - outputs = c_parser_asm_operands (parser, false); - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - { - inputs = NULL_TREE; - clobbers = NULL_TREE; - goto done_asm; - } - if (!c_parser_require (parser, CPP_COLON, "expected %<:%> or %<)%>")) - { - c_lex_string_translate = 1; - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - return NULL_TREE; - } - /* Parse inputs. */ - if (c_parser_next_token_is (parser, CPP_COLON) - || c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - inputs = NULL_TREE; - else - inputs = c_parser_asm_operands (parser, true); - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - { - clobbers = NULL_TREE; - goto done_asm; - } - if (!c_parser_require (parser, CPP_COLON, "expected %<:%> or %<)%>")) - { - c_lex_string_translate = 1; - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - return NULL_TREE; - } - /* Parse clobbers. */ - clobbers = c_parser_asm_clobbers (parser); - done_asm: - c_lex_string_translate = 1; - if (!c_parser_require (parser, CPP_CLOSE_PAREN, "expected %<)%>")) - { - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - return NULL_TREE; - } - if (!c_parser_require (parser, CPP_SEMICOLON, "expected %<;%>")) - c_parser_skip_to_end_of_block_or_statement (parser); - ret = build_asm_stmt (quals, build_asm_expr (str, outputs, inputs, - clobbers, simple)); - return ret; -} - -/* Parse asm operands, a GNU extension. If CONVERT_P (for inputs but - not outputs), apply the default conversion of functions and arrays - to pointers. - - asm-operands: - asm-operand - asm-operands , asm-operand - - asm-operand: - asm-string-literal ( expression ) - [ identifier ] asm-string-literal ( expression ) -*/ - -static tree -c_parser_asm_operands (c_parser *parser, bool convert_p) -{ - tree list = NULL_TREE; - while (true) - { - tree name, str; - struct c_expr expr; - if (c_parser_next_token_is (parser, CPP_OPEN_SQUARE)) - { - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_NAME)) - { - tree id = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - name = build_string (IDENTIFIER_LENGTH (id), - IDENTIFIER_POINTER (id)); - } - else - { - c_parser_error (parser, "expected identifier"); - c_parser_skip_until_found (parser, CPP_CLOSE_SQUARE, NULL); - return NULL_TREE; - } - c_parser_skip_until_found (parser, CPP_CLOSE_SQUARE, - "expected %<]%>"); - } - else - name = NULL_TREE; - str = c_parser_asm_string_literal (parser); - if (str == NULL_TREE) - return NULL_TREE; - c_lex_string_translate = 1; - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - c_lex_string_translate = 0; - return NULL_TREE; - } - expr = c_parser_expression (parser); - if (convert_p) - expr = default_function_array_conversion (expr); - c_lex_string_translate = 0; - if (!c_parser_require (parser, CPP_CLOSE_PAREN, "expected %<)%>")) - { - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - return NULL_TREE; - } - list = chainon (list, build_tree_list (build_tree_list (name, str), - expr.value)); - if (c_parser_next_token_is (parser, CPP_COMMA)) - c_parser_consume_token (parser); - else - break; - } - return list; -} - -/* Parse asm clobbers, a GNU extension. - - asm-clobbers: - asm-string-literal - asm-clobbers , asm-string-literal -*/ - -static tree -c_parser_asm_clobbers (c_parser *parser) -{ - tree list = NULL_TREE; - while (true) - { - tree str = c_parser_asm_string_literal (parser); - if (str) - list = tree_cons (NULL_TREE, str, list); - else - return NULL_TREE; - if (c_parser_next_token_is (parser, CPP_COMMA)) - c_parser_consume_token (parser); - else - break; - } - return list; -} - -/* Parse an expression other than a compound expression; that is, an - assignment expression (C90 6.3.16, C99 6.5.16). If AFTER is not - NULL then it is an Objective-C message expression which is the - primary-expression starting the expression as an initializer. - - assignment-expression: - conditional-expression - unary-expression assignment-operator assignment-expression - - assignment-operator: one of - = *= /= %= += -= <<= >>= &= ^= |= - - In GNU C we accept any conditional expression on the LHS and - diagnose the invalid lvalue rather than producing a syntax - error. */ - -static struct c_expr -c_parser_expr_no_commas (c_parser *parser, struct c_expr *after) -{ - struct c_expr lhs, rhs, ret; - enum tree_code code; - gcc_assert (!after || c_dialect_objc ()); - lhs = c_parser_conditional_expression (parser, after); - switch (c_parser_peek_token (parser)->type) - { - case CPP_EQ: - code = NOP_EXPR; - break; - case CPP_MULT_EQ: - code = MULT_EXPR; - break; - case CPP_DIV_EQ: - code = TRUNC_DIV_EXPR; - break; - case CPP_MOD_EQ: - code = TRUNC_MOD_EXPR; - break; - case CPP_PLUS_EQ: - code = PLUS_EXPR; - break; - case CPP_MINUS_EQ: - code = MINUS_EXPR; - break; - case CPP_LSHIFT_EQ: - code = LSHIFT_EXPR; - break; - case CPP_RSHIFT_EQ: - code = RSHIFT_EXPR; - break; - case CPP_AND_EQ: - code = BIT_AND_EXPR; - break; - case CPP_XOR_EQ: - code = BIT_XOR_EXPR; - break; - case CPP_OR_EQ: - code = BIT_IOR_EXPR; - break; - default: - return lhs; - } - c_parser_consume_token (parser); - rhs = c_parser_expr_no_commas (parser, NULL); - rhs = default_function_array_conversion (rhs); - ret.value = build_modify_expr (lhs.value, code, rhs.value); - if (code == NOP_EXPR) - ret.original_code = MODIFY_EXPR; - else - { - TREE_NO_WARNING (ret.value) = 1; - ret.original_code = ERROR_MARK; - } - return ret; -} - -/* Parse a conditional expression (C90 6.3.15, C99 6.5.15). If AFTER - is not NULL then it is an Objective-C message expression which is - the primary-expression starting the expression as an initializer. - - conditional-expression: - logical-OR-expression - logical-OR-expression ? expression : conditional-expression - - GNU extensions: - - conditional-expression: - logical-OR-expression ? : conditional-expression -*/ - -static struct c_expr -c_parser_conditional_expression (c_parser *parser, struct c_expr *after) -{ - struct c_expr cond, exp1, exp2, ret; - gcc_assert (!after || c_dialect_objc ()); - cond = c_parser_binary_expression (parser, after); - if (c_parser_next_token_is_not (parser, CPP_QUERY)) - return cond; - cond = default_function_array_conversion (cond); - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_COLON)) - { - if (pedantic) - pedwarn ("ISO C forbids omitting the middle term of a ?: expression"); - /* Make sure first operand is calculated only once. */ - exp1.value = save_expr (default_conversion (cond.value)); - cond.value = c_objc_common_truthvalue_conversion (exp1.value); - skip_evaluation += cond.value == truthvalue_true_node; - } - else - { - cond.value - = c_objc_common_truthvalue_conversion - (default_conversion (cond.value)); - skip_evaluation += cond.value == truthvalue_false_node; - exp1 = c_parser_expression_conv (parser); - skip_evaluation += ((cond.value == truthvalue_true_node) - - (cond.value == truthvalue_false_node)); - } - if (!c_parser_require (parser, CPP_COLON, "expected %<:%>")) - { - skip_evaluation -= cond.value == truthvalue_true_node; - ret.value = error_mark_node; - ret.original_code = ERROR_MARK; - return ret; - } - exp2 = c_parser_conditional_expression (parser, NULL); - exp2 = default_function_array_conversion (exp2); - skip_evaluation -= cond.value == truthvalue_true_node; - ret.value = build_conditional_expr (cond.value, exp1.value, exp2.value); - ret.original_code = ERROR_MARK; - return ret; -} - -/* Parse a binary expression; that is, a logical-OR-expression (C90 - 6.3.5-6.3.14, C99 6.5.5-6.5.14). If AFTER is not NULL then it is - an Objective-C message expression which is the primary-expression - starting the expression as an initializer. - - multiplicative-expression: - cast-expression - multiplicative-expression * cast-expression - multiplicative-expression / cast-expression - multiplicative-expression % cast-expression - - additive-expression: - multiplicative-expression - additive-expression + multiplicative-expression - additive-expression - multiplicative-expression - - shift-expression: - additive-expression - shift-expression << additive-expression - shift-expression >> additive-expression - - relational-expression: - shift-expression - relational-expression < shift-expression - relational-expression > shift-expression - relational-expression <= shift-expression - relational-expression >= shift-expression - - equality-expression: - relational-expression - equality-expression == relational-expression - equality-expression != relational-expression - - AND-expression: - equality-expression - AND-expression & equality-expression - - exclusive-OR-expression: - AND-expression - exclusive-OR-expression ^ AND-expression - - inclusive-OR-expression: - exclusive-OR-expression - inclusive-OR-expression | exclusive-OR-expression - - logical-AND-expression: - inclusive-OR-expression - logical-AND-expression && inclusive-OR-expression - - logical-OR-expression: - logical-AND-expression - logical-OR-expression || logical-AND-expression -*/ - -static struct c_expr -c_parser_binary_expression (c_parser *parser, struct c_expr *after) -{ - /* A binary expression is parsed using operator-precedence parsing, - with the operands being cast expressions. All the binary - operators are left-associative. Thus a binary expression is of - form: - - E0 op1 E1 op2 E2 ... - - which we represent on a stack. On the stack, the precedence - levels are strictly increasing. When a new operator is - encountered of higher precedence than that at the top of the - stack, it is pushed; its LHS is the top expression, and its RHS - is everything parsed until it is popped. When a new operator is - encountered with precedence less than or equal to that at the top - of the stack, triples E[i-1] op[i] E[i] are popped and replaced - by the result of the operation until the operator at the top of - the stack has lower precedence than the new operator or there is - only one element on the stack; then the top expression is the LHS - of the new operator. In the case of logical AND and OR - expressions, we also need to adjust skip_evaluation as - appropriate when the operators are pushed and popped. */ - - /* The precedence levels, where 0 is a dummy lowest level used for - the bottom of the stack. */ - enum prec { - PREC_NONE, - PREC_LOGOR, - PREC_LOGAND, - PREC_BITOR, - PREC_BITXOR, - PREC_BITAND, - PREC_EQ, - PREC_REL, - PREC_SHIFT, - PREC_ADD, - PREC_MULT, - NUM_PRECS - }; - struct { - /* The expression at this stack level. */ - struct c_expr expr; - /* The precedence of the operator on its left, PREC_NONE at the - bottom of the stack. */ - enum prec prec; - /* The operation on its left. */ - enum tree_code op; - } stack[NUM_PRECS]; - int sp; -#define POP \ - do { \ - switch (stack[sp].op) \ - { \ - case TRUTH_ANDIF_EXPR: \ - skip_evaluation -= stack[sp - 1].expr.value == truthvalue_false_node; \ - break; \ - case TRUTH_ORIF_EXPR: \ - skip_evaluation -= stack[sp - 1].expr.value == truthvalue_true_node; \ - break; \ - default: \ - break; \ - } \ - stack[sp - 1].expr \ - = default_function_array_conversion (stack[sp - 1].expr); \ - stack[sp].expr \ - = default_function_array_conversion (stack[sp].expr); \ - stack[sp - 1].expr = parser_build_binary_op (stack[sp].op, \ - stack[sp - 1].expr, \ - stack[sp].expr); \ - sp--; \ - } while (0) - gcc_assert (!after || c_dialect_objc ()); - stack[0].expr = c_parser_cast_expression (parser, after); - stack[0].prec = PREC_NONE; - sp = 0; - while (true) - { - enum prec oprec; - enum tree_code ocode; - if (parser->error) - goto out; - switch (c_parser_peek_token (parser)->type) - { - case CPP_MULT: - oprec = PREC_MULT; - ocode = MULT_EXPR; - break; - case CPP_DIV: - oprec = PREC_MULT; - ocode = TRUNC_DIV_EXPR; - break; - case CPP_MOD: - oprec = PREC_MULT; - ocode = TRUNC_MOD_EXPR; - break; - case CPP_PLUS: - oprec = PREC_ADD; - ocode = PLUS_EXPR; - break; - case CPP_MINUS: - oprec = PREC_ADD; - ocode = MINUS_EXPR; - break; - case CPP_LSHIFT: - oprec = PREC_SHIFT; - ocode = LSHIFT_EXPR; - break; - case CPP_RSHIFT: - oprec = PREC_SHIFT; - ocode = RSHIFT_EXPR; - break; - case CPP_LESS: - oprec = PREC_REL; - ocode = LT_EXPR; - break; - case CPP_GREATER: - oprec = PREC_REL; - ocode = GT_EXPR; - break; - case CPP_LESS_EQ: - oprec = PREC_REL; - ocode = LE_EXPR; - break; - case CPP_GREATER_EQ: - oprec = PREC_REL; - ocode = GE_EXPR; - break; - case CPP_EQ_EQ: - oprec = PREC_EQ; - ocode = EQ_EXPR; - break; - case CPP_NOT_EQ: - oprec = PREC_EQ; - ocode = NE_EXPR; - break; - case CPP_AND: - oprec = PREC_BITAND; - ocode = BIT_AND_EXPR; - break; - case CPP_XOR: - oprec = PREC_BITXOR; - ocode = BIT_XOR_EXPR; - break; - case CPP_OR: - oprec = PREC_BITOR; - ocode = BIT_IOR_EXPR; - break; - case CPP_AND_AND: - oprec = PREC_LOGAND; - ocode = TRUTH_ANDIF_EXPR; - break; - case CPP_OR_OR: - oprec = PREC_LOGOR; - ocode = TRUTH_ORIF_EXPR; - break; - default: - /* Not a binary operator, so end of the binary - expression. */ - goto out; - } - c_parser_consume_token (parser); - while (oprec <= stack[sp].prec) - POP; - switch (ocode) - { - case TRUTH_ANDIF_EXPR: - stack[sp].expr - = default_function_array_conversion (stack[sp].expr); - stack[sp].expr.value = c_objc_common_truthvalue_conversion - (default_conversion (stack[sp].expr.value)); - skip_evaluation += stack[sp].expr.value == truthvalue_false_node; - break; - case TRUTH_ORIF_EXPR: - stack[sp].expr - = default_function_array_conversion (stack[sp].expr); - stack[sp].expr.value = c_objc_common_truthvalue_conversion - (default_conversion (stack[sp].expr.value)); - skip_evaluation += stack[sp].expr.value == truthvalue_true_node; - break; - default: - break; - } - sp++; - stack[sp].expr = c_parser_cast_expression (parser, NULL); - stack[sp].prec = oprec; - stack[sp].op = ocode; - } - out: - while (sp > 0) - POP; - return stack[0].expr; -#undef POP -} - -/* Parse a cast expression (C90 6.3.4, C99 6.5.4). If AFTER is not - NULL then it is an Objective-C message expression which is the - primary-expression starting the expression as an initializer. - - cast-expression: - unary-expression - ( type-name ) unary-expression -*/ - -static struct c_expr -c_parser_cast_expression (c_parser *parser, struct c_expr *after) -{ - gcc_assert (!after || c_dialect_objc ()); - if (after) - return c_parser_postfix_expression_after_primary (parser, *after); - /* If the expression begins with a parenthesized type name, it may - be either a cast or a compound literal; we need to see whether - the next character is '{' to tell the difference. If not, it is - an unary expression. */ - if (c_parser_next_token_is (parser, CPP_OPEN_PAREN) - && c_token_starts_typename (c_parser_peek_2nd_token (parser))) - { - struct c_type_name *type_name; - struct c_expr ret; - struct c_expr expr; - c_parser_consume_token (parser); - type_name = c_parser_type_name (parser); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - if (type_name == NULL) - { - ret.value = error_mark_node; - ret.original_code = ERROR_MARK; - return ret; - } - - /* Save casted types in the function's used types hash table. */ - used_types_insert (type_name->specs->type); - - if (c_parser_next_token_is (parser, CPP_OPEN_BRACE)) - return c_parser_postfix_expression_after_paren_type (parser, - type_name); - expr = c_parser_cast_expression (parser, NULL); - expr = default_function_array_conversion (expr); - ret.value = c_cast_expr (type_name, expr.value); - ret.original_code = ERROR_MARK; - return ret; - } - else - return c_parser_unary_expression (parser); -} - -/* Parse an unary expression (C90 6.3.3, C99 6.5.3). - - unary-expression: - postfix-expression - ++ unary-expression - -- unary-expression - unary-operator cast-expression - sizeof unary-expression - sizeof ( type-name ) - - unary-operator: one of - & * + - ~ ! - - GNU extensions: - - unary-expression: - __alignof__ unary-expression - __alignof__ ( type-name ) - && identifier - - unary-operator: one of - __extension__ __real__ __imag__ - - In addition, the GNU syntax treats ++ and -- as unary operators, so - they may be applied to cast expressions with errors for non-lvalues - given later. */ - -static struct c_expr -c_parser_unary_expression (c_parser *parser) -{ - int ext; - struct c_expr ret, op; - switch (c_parser_peek_token (parser)->type) - { - case CPP_PLUS_PLUS: - c_parser_consume_token (parser); - op = c_parser_cast_expression (parser, NULL); - op = default_function_array_conversion (op); - return parser_build_unary_op (PREINCREMENT_EXPR, op); - case CPP_MINUS_MINUS: - c_parser_consume_token (parser); - op = c_parser_cast_expression (parser, NULL); - op = default_function_array_conversion (op); - return parser_build_unary_op (PREDECREMENT_EXPR, op); - case CPP_AND: - c_parser_consume_token (parser); - return parser_build_unary_op (ADDR_EXPR, - c_parser_cast_expression (parser, NULL)); - case CPP_MULT: - c_parser_consume_token (parser); - op = c_parser_cast_expression (parser, NULL); - op = default_function_array_conversion (op); - ret.value = build_indirect_ref (op.value, "unary *"); - ret.original_code = ERROR_MARK; - return ret; - case CPP_PLUS: - c_parser_consume_token (parser); - if (!c_dialect_objc () && !in_system_header) - warning (OPT_Wtraditional, - "traditional C rejects the unary plus operator"); - op = c_parser_cast_expression (parser, NULL); - op = default_function_array_conversion (op); - return parser_build_unary_op (CONVERT_EXPR, op); - case CPP_MINUS: - c_parser_consume_token (parser); - op = c_parser_cast_expression (parser, NULL); - op = default_function_array_conversion (op); - return parser_build_unary_op (NEGATE_EXPR, op); - case CPP_COMPL: - c_parser_consume_token (parser); - op = c_parser_cast_expression (parser, NULL); - op = default_function_array_conversion (op); - return parser_build_unary_op (BIT_NOT_EXPR, op); - case CPP_NOT: - c_parser_consume_token (parser); - op = c_parser_cast_expression (parser, NULL); - op = default_function_array_conversion (op); - return parser_build_unary_op (TRUTH_NOT_EXPR, op); - case CPP_AND_AND: - /* Refer to the address of a label as a pointer. */ - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_NAME)) - { - ret.value = finish_label_address_expr - (c_parser_peek_token (parser)->value); - c_parser_consume_token (parser); - } - else - { - c_parser_error (parser, "expected identifier"); - ret.value = error_mark_node; - } - ret.original_code = ERROR_MARK; - return ret; - case CPP_KEYWORD: - switch (c_parser_peek_token (parser)->keyword) - { - case RID_SIZEOF: - return c_parser_sizeof_expression (parser); - case RID_ALIGNOF: - return c_parser_alignof_expression (parser); - case RID_EXTENSION: - c_parser_consume_token (parser); - ext = disable_extension_diagnostics (); - ret = c_parser_cast_expression (parser, NULL); - restore_extension_diagnostics (ext); - return ret; - case RID_REALPART: - c_parser_consume_token (parser); - op = c_parser_cast_expression (parser, NULL); - op = default_function_array_conversion (op); - return parser_build_unary_op (REALPART_EXPR, op); - case RID_IMAGPART: - c_parser_consume_token (parser); - op = c_parser_cast_expression (parser, NULL); - op = default_function_array_conversion (op); - return parser_build_unary_op (IMAGPART_EXPR, op); - default: - return c_parser_postfix_expression (parser); - } - default: - return c_parser_postfix_expression (parser); - } -} - -/* Parse a sizeof expression. */ - -static struct c_expr -c_parser_sizeof_expression (c_parser *parser) -{ - struct c_expr expr; - gcc_assert (c_parser_next_token_is_keyword (parser, RID_SIZEOF)); - c_parser_consume_token (parser); - skip_evaluation++; - in_sizeof++; - if (c_parser_next_token_is (parser, CPP_OPEN_PAREN) - && c_token_starts_typename (c_parser_peek_2nd_token (parser))) - { - /* Either sizeof ( type-name ) or sizeof unary-expression - starting with a compound literal. */ - struct c_type_name *type_name; - c_parser_consume_token (parser); - type_name = c_parser_type_name (parser); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - if (type_name == NULL) - { - struct c_expr ret; - skip_evaluation--; - in_sizeof--; - ret.value = error_mark_node; - ret.original_code = ERROR_MARK; - return ret; - } - if (c_parser_next_token_is (parser, CPP_OPEN_BRACE)) - { - expr = c_parser_postfix_expression_after_paren_type (parser, - type_name); - goto sizeof_expr; - } - /* sizeof ( type-name ). */ - skip_evaluation--; - in_sizeof--; - if (type_name->declarator->kind == cdk_array - && type_name->declarator->u.array.vla_unspec_p) - { - /* C99 6.7.5.2p4 */ - error ("%<[*]%> not allowed in other than a declaration"); - } - return c_expr_sizeof_type (type_name); - } - else - { - expr = c_parser_unary_expression (parser); - sizeof_expr: - skip_evaluation--; - in_sizeof--; - if (TREE_CODE (expr.value) == COMPONENT_REF - && DECL_C_BIT_FIELD (TREE_OPERAND (expr.value, 1))) - error ("%<sizeof%> applied to a bit-field"); - return c_expr_sizeof_expr (expr); - } -} - -/* Parse an alignof expression. */ - -static struct c_expr -c_parser_alignof_expression (c_parser *parser) -{ - struct c_expr expr; - gcc_assert (c_parser_next_token_is_keyword (parser, RID_ALIGNOF)); - c_parser_consume_token (parser); - skip_evaluation++; - in_alignof++; - if (c_parser_next_token_is (parser, CPP_OPEN_PAREN) - && c_token_starts_typename (c_parser_peek_2nd_token (parser))) - { - /* Either __alignof__ ( type-name ) or __alignof__ - unary-expression starting with a compound literal. */ - struct c_type_name *type_name; - struct c_expr ret; - c_parser_consume_token (parser); - type_name = c_parser_type_name (parser); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - if (type_name == NULL) - { - struct c_expr ret; - skip_evaluation--; - in_alignof--; - ret.value = error_mark_node; - ret.original_code = ERROR_MARK; - return ret; - } - if (c_parser_next_token_is (parser, CPP_OPEN_BRACE)) - { - expr = c_parser_postfix_expression_after_paren_type (parser, - type_name); - goto alignof_expr; - } - /* alignof ( type-name ). */ - skip_evaluation--; - in_alignof--; - ret.value = c_alignof (groktypename (type_name)); - ret.original_code = ERROR_MARK; - return ret; - } - else - { - struct c_expr ret; - expr = c_parser_unary_expression (parser); - alignof_expr: - skip_evaluation--; - in_alignof--; - ret.value = c_alignof_expr (expr.value); - ret.original_code = ERROR_MARK; - return ret; - } -} - -/* Parse a postfix expression (C90 6.3.1-6.3.2, C99 6.5.1-6.5.2). - - postfix-expression: - primary-expression - postfix-expression [ expression ] - postfix-expression ( argument-expression-list[opt] ) - postfix-expression . identifier - postfix-expression -> identifier - postfix-expression ++ - postfix-expression -- - ( type-name ) { initializer-list } - ( type-name ) { initializer-list , } - - argument-expression-list: - argument-expression - argument-expression-list , argument-expression - - primary-expression: - identifier - constant - string-literal - ( expression ) - - GNU extensions: - - primary-expression: - __func__ - (treated as a keyword in GNU C) - __FUNCTION__ - __PRETTY_FUNCTION__ - ( compound-statement ) - __builtin_va_arg ( assignment-expression , type-name ) - __builtin_offsetof ( type-name , offsetof-member-designator ) - __builtin_choose_expr ( assignment-expression , - assignment-expression , - assignment-expression ) - __builtin_types_compatible_p ( type-name , type-name ) - - offsetof-member-designator: - identifier - offsetof-member-designator . identifier - offsetof-member-designator [ expression ] - - Objective-C: - - primary-expression: - [ objc-receiver objc-message-args ] - @selector ( objc-selector-arg ) - @protocol ( identifier ) - @encode ( type-name ) - objc-string-literal -*/ - -static struct c_expr -c_parser_postfix_expression (c_parser *parser) -{ - struct c_expr expr, e1, e2, e3; - struct c_type_name *t1, *t2; - switch (c_parser_peek_token (parser)->type) - { - case CPP_NUMBER: - case CPP_CHAR: - case CPP_WCHAR: - expr.value = c_parser_peek_token (parser)->value; - expr.original_code = ERROR_MARK; - c_parser_consume_token (parser); - break; - case CPP_STRING: - case CPP_WSTRING: - expr.value = c_parser_peek_token (parser)->value; - expr.original_code = STRING_CST; - c_parser_consume_token (parser); - break; - case CPP_OBJC_STRING: - gcc_assert (c_dialect_objc ()); - expr.value - = objc_build_string_object (c_parser_peek_token (parser)->value); - expr.original_code = ERROR_MARK; - c_parser_consume_token (parser); - break; - case CPP_NAME: - if (c_parser_peek_token (parser)->id_kind != C_ID_ID) - { - c_parser_error (parser, "expected expression"); - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - { - tree id = c_parser_peek_token (parser)->value; - location_t loc = c_parser_peek_token (parser)->location; - c_parser_consume_token (parser); - expr.value = build_external_ref (id, - (c_parser_peek_token (parser)->type - == CPP_OPEN_PAREN), loc); - expr.original_code = ERROR_MARK; - } - break; - case CPP_OPEN_PAREN: - /* A parenthesized expression, statement expression or compound - literal. */ - if (c_parser_peek_2nd_token (parser)->type == CPP_OPEN_BRACE) - { - /* A statement expression. */ - tree stmt; - c_parser_consume_token (parser); - c_parser_consume_token (parser); - if (cur_stmt_list == NULL) - { - error ("braced-group within expression allowed " - "only inside a function"); - parser->error = true; - c_parser_skip_until_found (parser, CPP_CLOSE_BRACE, NULL); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - stmt = c_begin_stmt_expr (); - c_parser_compound_statement_nostart (parser); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - if (pedantic) - pedwarn ("ISO C forbids braced-groups within expressions"); - expr.value = c_finish_stmt_expr (stmt); - expr.original_code = ERROR_MARK; - } - else if (c_token_starts_typename (c_parser_peek_2nd_token (parser))) - { - /* A compound literal. ??? Can we actually get here rather - than going directly to - c_parser_postfix_expression_after_paren_type from - elsewhere? */ - struct c_type_name *type_name; - c_parser_consume_token (parser); - type_name = c_parser_type_name (parser); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - if (type_name == NULL) - { - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - } - else - expr = c_parser_postfix_expression_after_paren_type (parser, - type_name); - } - else - { - /* A parenthesized expression. */ - c_parser_consume_token (parser); - expr = c_parser_expression (parser); - if (TREE_CODE (expr.value) == MODIFY_EXPR) - TREE_NO_WARNING (expr.value) = 1; - expr.original_code = ERROR_MARK; - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - } - break; - case CPP_KEYWORD: - switch (c_parser_peek_token (parser)->keyword) - { - case RID_FUNCTION_NAME: - case RID_PRETTY_FUNCTION_NAME: - case RID_C99_FUNCTION_NAME: - expr.value = fname_decl (c_parser_peek_token (parser)->keyword, - c_parser_peek_token (parser)->value); - expr.original_code = ERROR_MARK; - c_parser_consume_token (parser); - break; - case RID_VA_ARG: - c_parser_consume_token (parser); - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - e1 = c_parser_expr_no_commas (parser, NULL); - if (!c_parser_require (parser, CPP_COMMA, "expected %<,%>")) - { - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - t1 = c_parser_type_name (parser); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - if (t1 == NULL) - { - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - } - else - { - expr.value = build_va_arg (e1.value, groktypename (t1)); - expr.original_code = ERROR_MARK; - } - break; - case RID_OFFSETOF: - c_parser_consume_token (parser); - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - t1 = c_parser_type_name (parser); - if (t1 == NULL) - { - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - if (!c_parser_require (parser, CPP_COMMA, "expected %<,%>")) - { - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - { - tree type = groktypename (t1); - tree offsetof_ref; - if (type == error_mark_node) - offsetof_ref = error_mark_node; - else - offsetof_ref = build1 (INDIRECT_REF, type, null_pointer_node); - /* Parse the second argument to __builtin_offsetof. We - must have one identifier, and beyond that we want to - accept sub structure and sub array references. */ - if (c_parser_next_token_is (parser, CPP_NAME)) - { - offsetof_ref = build_component_ref - (offsetof_ref, c_parser_peek_token (parser)->value); - c_parser_consume_token (parser); - while (c_parser_next_token_is (parser, CPP_DOT) - || c_parser_next_token_is (parser, - CPP_OPEN_SQUARE)) - { - if (c_parser_next_token_is (parser, CPP_DOT)) - { - c_parser_consume_token (parser); - if (c_parser_next_token_is_not (parser, - CPP_NAME)) - { - c_parser_error (parser, "expected identifier"); - break; - } - offsetof_ref = build_component_ref - (offsetof_ref, - c_parser_peek_token (parser)->value); - c_parser_consume_token (parser); - } - else - { - tree idx; - c_parser_consume_token (parser); - idx = c_parser_expression (parser).value; - c_parser_skip_until_found (parser, CPP_CLOSE_SQUARE, - "expected %<]%>"); - offsetof_ref = build_array_ref (offsetof_ref, idx); - } - } - } - else - c_parser_error (parser, "expected identifier"); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - expr.value = fold_offsetof (offsetof_ref, NULL_TREE); - expr.original_code = ERROR_MARK; - } - break; - case RID_CHOOSE_EXPR: - c_parser_consume_token (parser); - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - e1 = c_parser_expr_no_commas (parser, NULL); - if (!c_parser_require (parser, CPP_COMMA, "expected %<,%>")) - { - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - e2 = c_parser_expr_no_commas (parser, NULL); - if (!c_parser_require (parser, CPP_COMMA, "expected %<,%>")) - { - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - e3 = c_parser_expr_no_commas (parser, NULL); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - { - tree c; - - c = fold (e1.value); - if (TREE_CODE (c) != INTEGER_CST) - error ("first argument to %<__builtin_choose_expr%> not" - " a constant"); - expr = integer_zerop (c) ? e3 : e2; - } - break; - case RID_TYPES_COMPATIBLE_P: - c_parser_consume_token (parser); - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - t1 = c_parser_type_name (parser); - if (t1 == NULL) - { - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - if (!c_parser_require (parser, CPP_COMMA, "expected %<,%>")) - { - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - t2 = c_parser_type_name (parser); - if (t2 == NULL) - { - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - { - tree e1, e2; - - e1 = TYPE_MAIN_VARIANT (groktypename (t1)); - e2 = TYPE_MAIN_VARIANT (groktypename (t2)); - - expr.value = comptypes (e1, e2) - ? build_int_cst (NULL_TREE, 1) - : build_int_cst (NULL_TREE, 0); - expr.original_code = ERROR_MARK; - } - break; - case RID_AT_SELECTOR: - gcc_assert (c_dialect_objc ()); - c_parser_consume_token (parser); - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - { - tree sel = c_parser_objc_selector_arg (parser); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - expr.value = objc_build_selector_expr (sel); - expr.original_code = ERROR_MARK; - } - break; - case RID_AT_PROTOCOL: - gcc_assert (c_dialect_objc ()); - c_parser_consume_token (parser); - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - if (c_parser_next_token_is_not (parser, CPP_NAME)) - { - c_parser_error (parser, "expected identifier"); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - { - tree id = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - expr.value = objc_build_protocol_expr (id); - expr.original_code = ERROR_MARK; - } - break; - case RID_AT_ENCODE: - /* Extension to support C-structures in the archiver. */ - gcc_assert (c_dialect_objc ()); - c_parser_consume_token (parser); - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - t1 = c_parser_type_name (parser); - if (t1 == NULL) - { - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - break; - } - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - { - tree type = groktypename (t1); - expr.value = objc_build_encode_expr (type); - expr.original_code = ERROR_MARK; - } - break; - default: - c_parser_error (parser, "expected expression"); - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - break; - case CPP_OPEN_SQUARE: - if (c_dialect_objc ()) - { - tree receiver, args; - c_parser_consume_token (parser); - receiver = c_parser_objc_receiver (parser); - args = c_parser_objc_message_args (parser); - c_parser_skip_until_found (parser, CPP_CLOSE_SQUARE, - "expected %<]%>"); - expr.value = objc_build_message_expr (build_tree_list (receiver, - args)); - expr.original_code = ERROR_MARK; - break; - } - /* Else fall through to report error. */ - default: - c_parser_error (parser, "expected expression"); - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - break; - } - return c_parser_postfix_expression_after_primary (parser, expr); -} - -/* Parse a postfix expression after a parenthesized type name: the - brace-enclosed initializer of a compound literal, possibly followed - by some postfix operators. This is separate because it is not - possible to tell until after the type name whether a cast - expression has a cast or a compound literal, or whether the operand - of sizeof is a parenthesized type name or starts with a compound - literal. */ - -static struct c_expr -c_parser_postfix_expression_after_paren_type (c_parser *parser, - struct c_type_name *type_name) -{ - tree type; - struct c_expr init; - struct c_expr expr; - start_init (NULL_TREE, NULL, 0); - type = groktypename (type_name); - if (type != error_mark_node && C_TYPE_VARIABLE_SIZE (type)) - { - error ("compound literal has variable size"); - type = error_mark_node; - } - init = c_parser_braced_init (parser, type, false); - finish_init (); - maybe_warn_string_init (type, init); - - if (pedantic && !flag_isoc99) - pedwarn ("ISO C90 forbids compound literals"); - expr.value = build_compound_literal (type, init.value); - expr.original_code = ERROR_MARK; - return c_parser_postfix_expression_after_primary (parser, expr); -} - -/* Parse a postfix expression after the initial primary or compound - literal; that is, parse a series of postfix operators. */ - -static struct c_expr -c_parser_postfix_expression_after_primary (c_parser *parser, - struct c_expr expr) -{ - tree ident, idx, exprlist; - while (true) - { - switch (c_parser_peek_token (parser)->type) - { - case CPP_OPEN_SQUARE: - /* Array reference. */ - c_parser_consume_token (parser); - idx = c_parser_expression (parser).value; - c_parser_skip_until_found (parser, CPP_CLOSE_SQUARE, - "expected %<]%>"); - expr.value = build_array_ref (expr.value, idx); - expr.original_code = ERROR_MARK; - break; - case CPP_OPEN_PAREN: - /* Function call. */ - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN)) - exprlist = NULL_TREE; - else - exprlist = c_parser_expr_list (parser, true); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - expr.value = build_function_call (expr.value, exprlist); - expr.original_code = ERROR_MARK; - break; - case CPP_DOT: - /* Structure element reference. */ - c_parser_consume_token (parser); - expr = default_function_array_conversion (expr); - if (c_parser_next_token_is (parser, CPP_NAME)) - ident = c_parser_peek_token (parser)->value; - else - { - c_parser_error (parser, "expected identifier"); - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - return expr; - } - c_parser_consume_token (parser); - expr.value = build_component_ref (expr.value, ident); - expr.original_code = ERROR_MARK; - break; - case CPP_DEREF: - /* Structure element reference. */ - c_parser_consume_token (parser); - expr = default_function_array_conversion (expr); - if (c_parser_next_token_is (parser, CPP_NAME)) - ident = c_parser_peek_token (parser)->value; - else - { - c_parser_error (parser, "expected identifier"); - expr.value = error_mark_node; - expr.original_code = ERROR_MARK; - return expr; - } - c_parser_consume_token (parser); - expr.value = build_component_ref (build_indirect_ref (expr.value, - "->"), ident); - expr.original_code = ERROR_MARK; - break; - case CPP_PLUS_PLUS: - /* Postincrement. */ - c_parser_consume_token (parser); - expr = default_function_array_conversion (expr); - expr.value = build_unary_op (POSTINCREMENT_EXPR, expr.value, 0); - expr.original_code = ERROR_MARK; - break; - case CPP_MINUS_MINUS: - /* Postdecrement. */ - c_parser_consume_token (parser); - expr = default_function_array_conversion (expr); - expr.value = build_unary_op (POSTDECREMENT_EXPR, expr.value, 0); - expr.original_code = ERROR_MARK; - break; - default: - return expr; - } - } -} - -/* Parse an expression (C90 6.3.17, C99 6.5.17). - - expression: - assignment-expression - expression , assignment-expression -*/ - -static struct c_expr -c_parser_expression (c_parser *parser) -{ - struct c_expr expr; - expr = c_parser_expr_no_commas (parser, NULL); - while (c_parser_next_token_is (parser, CPP_COMMA)) - { - struct c_expr next; - c_parser_consume_token (parser); - next = c_parser_expr_no_commas (parser, NULL); - next = default_function_array_conversion (next); - expr.value = build_compound_expr (expr.value, next.value); - expr.original_code = COMPOUND_EXPR; - } - return expr; -} - -/* Parse an expression and convert functions or arrays to - pointers. */ - -static struct c_expr -c_parser_expression_conv (c_parser *parser) -{ - struct c_expr expr; - expr = c_parser_expression (parser); - expr = default_function_array_conversion (expr); - return expr; -} - -/* Parse a non-empty list of expressions. If CONVERT_P, convert - functions and arrays to pointers. - - nonempty-expr-list: - assignment-expression - nonempty-expr-list , assignment-expression -*/ - -static tree -c_parser_expr_list (c_parser *parser, bool convert_p) -{ - struct c_expr expr; - tree ret, cur; - expr = c_parser_expr_no_commas (parser, NULL); - if (convert_p) - expr = default_function_array_conversion (expr); - ret = cur = build_tree_list (NULL_TREE, expr.value); - while (c_parser_next_token_is (parser, CPP_COMMA)) - { - c_parser_consume_token (parser); - expr = c_parser_expr_no_commas (parser, NULL); - if (convert_p) - expr = default_function_array_conversion (expr); - cur = TREE_CHAIN (cur) = build_tree_list (NULL_TREE, expr.value); - } - return ret; -} - - -/* Parse Objective-C-specific constructs. */ - -/* Parse an objc-class-definition. - - objc-class-definition: - @interface identifier objc-superclass[opt] objc-protocol-refs[opt] - objc-class-instance-variables[opt] objc-methodprotolist @end - @implementation identifier objc-superclass[opt] - objc-class-instance-variables[opt] - @interface identifier ( identifier ) objc-protocol-refs[opt] - objc-methodprotolist @end - @implementation identifier ( identifier ) - - objc-superclass: - : identifier - - "@interface identifier (" must start "@interface identifier ( - identifier ) ...": objc-methodprotolist in the first production may - not start with a parenthesized identifier as a declarator of a data - definition with no declaration specifiers if the objc-superclass, - objc-protocol-refs and objc-class-instance-variables are omitted. */ - -static void -c_parser_objc_class_definition (c_parser *parser) -{ - bool iface_p; - tree id1; - tree superclass; - if (c_parser_next_token_is_keyword (parser, RID_AT_INTERFACE)) - iface_p = true; - else if (c_parser_next_token_is_keyword (parser, RID_AT_IMPLEMENTATION)) - iface_p = false; - else - gcc_unreachable (); - c_parser_consume_token (parser); - if (c_parser_next_token_is_not (parser, CPP_NAME)) - { - c_parser_error (parser, "expected identifier"); - return; - } - id1 = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_OPEN_PAREN)) - { - tree id2; - tree proto = NULL_TREE; - c_parser_consume_token (parser); - if (c_parser_next_token_is_not (parser, CPP_NAME)) - { - c_parser_error (parser, "expected identifier"); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - return; - } - id2 = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - if (!iface_p) - { - objc_start_category_implementation (id1, id2); - return; - } - if (c_parser_next_token_is (parser, CPP_LESS)) - proto = c_parser_objc_protocol_refs (parser); - objc_start_category_interface (id1, id2, proto); - c_parser_objc_methodprotolist (parser); - c_parser_require_keyword (parser, RID_AT_END, "expected %<@end%>"); - objc_finish_interface (); - return; - } - if (c_parser_next_token_is (parser, CPP_COLON)) - { - c_parser_consume_token (parser); - if (c_parser_next_token_is_not (parser, CPP_NAME)) - { - c_parser_error (parser, "expected identifier"); - return; - } - superclass = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - } - else - superclass = NULL_TREE; - if (iface_p) - { - tree proto = NULL_TREE; - if (c_parser_next_token_is (parser, CPP_LESS)) - proto = c_parser_objc_protocol_refs (parser); - objc_start_class_interface (id1, superclass, proto); - } - else - objc_start_class_implementation (id1, superclass); - if (c_parser_next_token_is (parser, CPP_OPEN_BRACE)) - c_parser_objc_class_instance_variables (parser); - if (iface_p) - { - objc_continue_interface (); - c_parser_objc_methodprotolist (parser); - c_parser_require_keyword (parser, RID_AT_END, "expected %<@end%>"); - objc_finish_interface (); - } - else - { - objc_continue_implementation (); - return; - } -} - -/* Parse objc-class-instance-variables. - - objc-class-instance-variables: - { objc-instance-variable-decl-list[opt] } - - objc-instance-variable-decl-list: - objc-visibility-spec - objc-instance-variable-decl ; - ; - objc-instance-variable-decl-list objc-visibility-spec - objc-instance-variable-decl-list objc-instance-variable-decl ; - objc-instance-variable-decl-list ; - - objc-visibility-spec: - @private - @protected - @public - - objc-instance-variable-decl: - struct-declaration -*/ - -static void -c_parser_objc_class_instance_variables (c_parser *parser) -{ - gcc_assert (c_parser_next_token_is (parser, CPP_OPEN_BRACE)); - c_parser_consume_token (parser); - while (c_parser_next_token_is_not (parser, CPP_EOF)) - { - tree decls; - /* Parse any stray semicolon. */ - if (c_parser_next_token_is (parser, CPP_SEMICOLON)) - { - if (pedantic) - pedwarn ("extra semicolon in struct or union specified"); - c_parser_consume_token (parser); - continue; - } - /* Stop if at the end of the instance variables. */ - if (c_parser_next_token_is (parser, CPP_CLOSE_BRACE)) - { - c_parser_consume_token (parser); - break; - } - /* Parse any objc-visibility-spec. */ - if (c_parser_next_token_is_keyword (parser, RID_AT_PRIVATE)) - { - c_parser_consume_token (parser); - objc_set_visibility (2); - continue; - } - else if (c_parser_next_token_is_keyword (parser, RID_AT_PROTECTED)) - { - c_parser_consume_token (parser); - objc_set_visibility (0); - continue; - } - else if (c_parser_next_token_is_keyword (parser, RID_AT_PUBLIC)) - { - c_parser_consume_token (parser); - objc_set_visibility (1); - continue; - } - else if (c_parser_next_token_is (parser, CPP_PRAGMA)) - { - c_parser_pragma (parser, pragma_external); - continue; - } - - /* Parse some comma-separated declarations. */ - decls = c_parser_struct_declaration (parser); - { - /* Comma-separated instance variables are chained together in - reverse order; add them one by one. */ - tree ivar = nreverse (decls); - for (; ivar; ivar = TREE_CHAIN (ivar)) - objc_add_instance_variable (copy_node (ivar)); - } - c_parser_skip_until_found (parser, CPP_SEMICOLON, "expected %<;%>"); - } -} - -/* Parse an objc-class-declaration. - - objc-class-declaration: - @class identifier-list ; -*/ - -static void -c_parser_objc_class_declaration (c_parser *parser) -{ - tree list = NULL_TREE; - gcc_assert (c_parser_next_token_is_keyword (parser, RID_AT_CLASS)); - c_parser_consume_token (parser); - /* Any identifiers, including those declared as type names, are OK - here. */ - while (true) - { - tree id; - if (c_parser_next_token_is_not (parser, CPP_NAME)) - { - c_parser_error (parser, "expected identifier"); - break; - } - id = c_parser_peek_token (parser)->value; - list = chainon (list, build_tree_list (NULL_TREE, id)); - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_COMMA)) - c_parser_consume_token (parser); - else - break; - } - c_parser_skip_until_found (parser, CPP_SEMICOLON, "expected %<;%>"); - objc_declare_class (list); -} - -/* Parse an objc-alias-declaration. - - objc-alias-declaration: - @compatibility_alias identifier identifier ; -*/ - -static void -c_parser_objc_alias_declaration (c_parser *parser) -{ - tree id1, id2; - gcc_assert (c_parser_next_token_is_keyword (parser, RID_AT_ALIAS)); - c_parser_consume_token (parser); - if (c_parser_next_token_is_not (parser, CPP_NAME)) - { - c_parser_error (parser, "expected identifier"); - c_parser_skip_until_found (parser, CPP_SEMICOLON, NULL); - return; - } - id1 = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - if (c_parser_next_token_is_not (parser, CPP_NAME)) - { - c_parser_error (parser, "expected identifier"); - c_parser_skip_until_found (parser, CPP_SEMICOLON, NULL); - return; - } - id2 = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - c_parser_skip_until_found (parser, CPP_SEMICOLON, "expected %<;%>"); - objc_declare_alias (id1, id2); -} - -/* Parse an objc-protocol-definition. - - objc-protocol-definition: - @protocol identifier objc-protocol-refs[opt] objc-methodprotolist @end - @protocol identifier-list ; - - "@protocol identifier ;" should be resolved as "@protocol - identifier-list ;": objc-methodprotolist may not start with a - semicolon in the first alternative if objc-protocol-refs are - omitted. */ - -static void -c_parser_objc_protocol_definition (c_parser *parser) -{ - gcc_assert (c_parser_next_token_is_keyword (parser, RID_AT_PROTOCOL)); - c_parser_consume_token (parser); - if (c_parser_next_token_is_not (parser, CPP_NAME)) - { - c_parser_error (parser, "expected identifier"); - return; - } - if (c_parser_peek_2nd_token (parser)->type == CPP_COMMA - || c_parser_peek_2nd_token (parser)->type == CPP_SEMICOLON) - { - tree list = NULL_TREE; - /* Any identifiers, including those declared as type names, are - OK here. */ - while (true) - { - tree id; - if (c_parser_next_token_is_not (parser, CPP_NAME)) - { - c_parser_error (parser, "expected identifier"); - break; - } - id = c_parser_peek_token (parser)->value; - list = chainon (list, build_tree_list (NULL_TREE, id)); - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_COMMA)) - c_parser_consume_token (parser); - else - break; - } - c_parser_skip_until_found (parser, CPP_SEMICOLON, "expected %<;%>"); - objc_declare_protocols (list); - } - else - { - tree id = c_parser_peek_token (parser)->value; - tree proto = NULL_TREE; - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_LESS)) - proto = c_parser_objc_protocol_refs (parser); - objc_pq_context = 1; - objc_start_protocol (id, proto); - c_parser_objc_methodprotolist (parser); - c_parser_require_keyword (parser, RID_AT_END, "expected %<@end%>"); - objc_pq_context = 0; - objc_finish_interface (); - } -} - -/* Parse an objc-method-type. - - objc-method-type: - + - - -*/ - -static enum tree_code -c_parser_objc_method_type (c_parser *parser) -{ - switch (c_parser_peek_token (parser)->type) - { - case CPP_PLUS: - c_parser_consume_token (parser); - return PLUS_EXPR; - case CPP_MINUS: - c_parser_consume_token (parser); - return MINUS_EXPR; - default: - gcc_unreachable (); - } -} - -/* Parse an objc-method-definition. - - objc-method-definition: - objc-method-type objc-method-decl ;[opt] compound-statement -*/ - -static void -c_parser_objc_method_definition (c_parser *parser) -{ - enum tree_code type = c_parser_objc_method_type (parser); - tree decl; - objc_set_method_type (type); - objc_pq_context = 1; - decl = c_parser_objc_method_decl (parser); - if (c_parser_next_token_is (parser, CPP_SEMICOLON)) - { - c_parser_consume_token (parser); - if (pedantic) - pedwarn ("extra semicolon in method definition specified"); - } - if (!c_parser_next_token_is (parser, CPP_OPEN_BRACE)) - { - c_parser_error (parser, "expected %<{%>"); - return; - } - objc_pq_context = 0; - objc_start_method_definition (decl); - add_stmt (c_parser_compound_statement (parser)); - objc_finish_method_definition (current_function_decl); -} - -/* Parse an objc-methodprotolist. - - objc-methodprotolist: - empty - objc-methodprotolist objc-methodproto - objc-methodprotolist declaration - objc-methodprotolist ; - - The declaration is a data definition, which may be missing - declaration specifiers under the same rules and diagnostics as - other data definitions outside functions, and the stray semicolon - is diagnosed the same way as a stray semicolon outside a - function. */ - -static void -c_parser_objc_methodprotolist (c_parser *parser) -{ - while (true) - { - /* The list is terminated by @end. */ - switch (c_parser_peek_token (parser)->type) - { - case CPP_SEMICOLON: - if (pedantic) - pedwarn ("ISO C does not allow extra %<;%> outside of a function"); - c_parser_consume_token (parser); - break; - case CPP_PLUS: - case CPP_MINUS: - c_parser_objc_methodproto (parser); - break; - case CPP_PRAGMA: - c_parser_pragma (parser, pragma_external); - break; - case CPP_EOF: - return; - default: - if (c_parser_next_token_is_keyword (parser, RID_AT_END)) - return; - c_parser_declaration_or_fndef (parser, false, true, false, true); - break; - } - } -} - -/* Parse an objc-methodproto. - - objc-methodproto: - objc-method-type objc-method-decl ; -*/ - -static void -c_parser_objc_methodproto (c_parser *parser) -{ - enum tree_code type = c_parser_objc_method_type (parser); - tree decl; - objc_set_method_type (type); - /* Remember protocol qualifiers in prototypes. */ - objc_pq_context = 1; - decl = c_parser_objc_method_decl (parser); - /* Forget protocol qualifiers here. */ - objc_pq_context = 0; - objc_add_method_declaration (decl); - c_parser_skip_until_found (parser, CPP_SEMICOLON, "expected %<;%>"); -} - -/* Parse an objc-method-decl. - - objc-method-decl: - ( objc-type-name ) objc-selector - objc-selector - ( objc-type-name ) objc-keyword-selector objc-optparmlist - objc-keyword-selector objc-optparmlist - - objc-keyword-selector: - objc-keyword-decl - objc-keyword-selector objc-keyword-decl - - objc-keyword-decl: - objc-selector : ( objc-type-name ) identifier - objc-selector : identifier - : ( objc-type-name ) identifier - : identifier - - objc-optparmlist: - objc-optparms objc-optellipsis - - objc-optparms: - empty - objc-opt-parms , parameter-declaration - - objc-optellipsis: - empty - , ... -*/ - -static tree -c_parser_objc_method_decl (c_parser *parser) -{ - tree type = NULL_TREE; - tree sel; - tree parms = NULL_TREE; - bool ellipsis = false; - - if (c_parser_next_token_is (parser, CPP_OPEN_PAREN)) - { - c_parser_consume_token (parser); - type = c_parser_objc_type_name (parser); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - } - sel = c_parser_objc_selector (parser); - /* If there is no selector, or a colon follows, we have an - objc-keyword-selector. If there is a selector, and a colon does - not follow, that selector ends the objc-method-decl. */ - if (!sel || c_parser_next_token_is (parser, CPP_COLON)) - { - tree tsel = sel; - tree list = NULL_TREE; - while (true) - { - tree atype = NULL_TREE, id, keyworddecl; - if (!c_parser_require (parser, CPP_COLON, "expected %<:%>")) - break; - if (c_parser_next_token_is (parser, CPP_OPEN_PAREN)) - { - c_parser_consume_token (parser); - atype = c_parser_objc_type_name (parser); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<)%>"); - } - if (c_parser_next_token_is_not (parser, CPP_NAME)) - { - c_parser_error (parser, "expected identifier"); - return error_mark_node; - } - id = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - keyworddecl = objc_build_keyword_decl (tsel, atype, id); - list = chainon (list, keyworddecl); - tsel = c_parser_objc_selector (parser); - if (!tsel && c_parser_next_token_is_not (parser, CPP_COLON)) - break; - } - /* Parse the optional parameter list. Optional Objective-C - method parameters follow the C syntax, and may include '...' - to denote a variable number of arguments. */ - parms = make_node (TREE_LIST); - while (c_parser_next_token_is (parser, CPP_COMMA)) - { - struct c_parm *parm; - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_ELLIPSIS)) - { - ellipsis = true; - c_parser_consume_token (parser); - break; - } - parm = c_parser_parameter_declaration (parser, NULL_TREE); - if (parm == NULL) - break; - parms = chainon (parms, - build_tree_list (NULL_TREE, grokparm (parm))); - } - sel = list; - } - return objc_build_method_signature (type, sel, parms, ellipsis); -} - -/* Parse an objc-type-name. - - objc-type-name: - objc-type-qualifiers[opt] type-name - objc-type-qualifiers[opt] - - objc-type-qualifiers: - objc-type-qualifier - objc-type-qualifiers objc-type-qualifier - - objc-type-qualifier: one of - in out inout bycopy byref oneway -*/ - -static tree -c_parser_objc_type_name (c_parser *parser) -{ - tree quals = NULL_TREE; - struct c_type_name *typename = NULL; - tree type = NULL_TREE; - while (true) - { - c_token *token = c_parser_peek_token (parser); - if (token->type == CPP_KEYWORD - && (token->keyword == RID_IN - || token->keyword == RID_OUT - || token->keyword == RID_INOUT - || token->keyword == RID_BYCOPY - || token->keyword == RID_BYREF - || token->keyword == RID_ONEWAY)) - { - quals = chainon (quals, build_tree_list (NULL_TREE, token->value)); - c_parser_consume_token (parser); - } - else - break; - } - if (c_parser_next_token_starts_typename (parser)) - typename = c_parser_type_name (parser); - if (typename) - type = groktypename (typename); - return build_tree_list (quals, type); -} - -/* Parse objc-protocol-refs. - - objc-protocol-refs: - < identifier-list > -*/ - -static tree -c_parser_objc_protocol_refs (c_parser *parser) -{ - tree list = NULL_TREE; - gcc_assert (c_parser_next_token_is (parser, CPP_LESS)); - c_parser_consume_token (parser); - /* Any identifiers, including those declared as type names, are OK - here. */ - while (true) - { - tree id; - if (c_parser_next_token_is_not (parser, CPP_NAME)) - { - c_parser_error (parser, "expected identifier"); - break; - } - id = c_parser_peek_token (parser)->value; - list = chainon (list, build_tree_list (NULL_TREE, id)); - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_COMMA)) - c_parser_consume_token (parser); - else - break; - } - c_parser_require (parser, CPP_GREATER, "expected %<>%>"); - return list; -} - -/* Parse an objc-try-catch-statement. - - objc-try-catch-statement: - @try compound-statement objc-catch-list[opt] - @try compound-statement objc-catch-list[opt] @finally compound-statement - - objc-catch-list: - @catch ( parameter-declaration ) compound-statement - objc-catch-list @catch ( parameter-declaration ) compound-statement -*/ - -static void -c_parser_objc_try_catch_statement (c_parser *parser) -{ - location_t loc; - tree stmt; - gcc_assert (c_parser_next_token_is_keyword (parser, RID_AT_TRY)); - c_parser_consume_token (parser); - loc = c_parser_peek_token (parser)->location; - stmt = c_parser_compound_statement (parser); - objc_begin_try_stmt (loc, stmt); - while (c_parser_next_token_is_keyword (parser, RID_AT_CATCH)) - { - struct c_parm *parm; - c_parser_consume_token (parser); - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - break; - parm = c_parser_parameter_declaration (parser, NULL_TREE); - if (parm == NULL) - { - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, NULL); - break; - } - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - objc_begin_catch_clause (grokparm (parm)); - if (c_parser_require (parser, CPP_OPEN_BRACE, "expected %<{%>")) - c_parser_compound_statement_nostart (parser); - objc_finish_catch_clause (); - } - if (c_parser_next_token_is_keyword (parser, RID_AT_FINALLY)) - { - location_t finloc; - tree finstmt; - c_parser_consume_token (parser); - finloc = c_parser_peek_token (parser)->location; - finstmt = c_parser_compound_statement (parser); - objc_build_finally_clause (finloc, finstmt); - } - objc_finish_try_stmt (); -} - -/* Parse an objc-synchronized-statement. - - objc-synchronized-statement: - @synchronized ( expression ) compound-statement -*/ - -static void -c_parser_objc_synchronized_statement (c_parser *parser) -{ - location_t loc; - tree expr, stmt; - gcc_assert (c_parser_next_token_is_keyword (parser, RID_AT_SYNCHRONIZED)); - c_parser_consume_token (parser); - loc = c_parser_peek_token (parser)->location; - if (c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - expr = c_parser_expression (parser).value; - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - } - else - expr = error_mark_node; - stmt = c_parser_compound_statement (parser); - objc_build_synchronized (loc, expr, stmt); -} - -/* Parse an objc-selector; return NULL_TREE without an error if the - next token is not an objc-selector. - - objc-selector: - identifier - one of - enum struct union if else while do for switch case default - break continue return goto asm sizeof typeof __alignof - unsigned long const short volatile signed restrict _Complex - in out inout bycopy byref oneway int char float double void _Bool - - ??? Why this selection of keywords but not, for example, storage - class specifiers? */ - -static tree -c_parser_objc_selector (c_parser *parser) -{ - c_token *token = c_parser_peek_token (parser); - tree value = token->value; - if (token->type == CPP_NAME) - { - c_parser_consume_token (parser); - return value; - } - if (token->type != CPP_KEYWORD) - return NULL_TREE; - switch (token->keyword) - { - case RID_ENUM: - case RID_STRUCT: - case RID_UNION: - case RID_IF: - case RID_ELSE: - case RID_WHILE: - case RID_DO: - case RID_FOR: - case RID_SWITCH: - case RID_CASE: - case RID_DEFAULT: - case RID_BREAK: - case RID_CONTINUE: - case RID_RETURN: - case RID_GOTO: - case RID_ASM: - case RID_SIZEOF: - case RID_TYPEOF: - case RID_ALIGNOF: - case RID_UNSIGNED: - case RID_LONG: - case RID_CONST: - case RID_SHORT: - case RID_VOLATILE: - case RID_SIGNED: - case RID_RESTRICT: - case RID_COMPLEX: - case RID_IN: - case RID_OUT: - case RID_INOUT: - case RID_BYCOPY: - case RID_BYREF: - case RID_ONEWAY: - case RID_INT: - case RID_CHAR: - case RID_FLOAT: - case RID_DOUBLE: - case RID_VOID: - case RID_BOOL: - c_parser_consume_token (parser); - return value; - default: - return NULL_TREE; - } -} - -/* Parse an objc-selector-arg. - - objc-selector-arg: - objc-selector - objc-keywordname-list - - objc-keywordname-list: - objc-keywordname - objc-keywordname-list objc-keywordname - - objc-keywordname: - objc-selector : - : -*/ - -static tree -c_parser_objc_selector_arg (c_parser *parser) -{ - tree sel = c_parser_objc_selector (parser); - tree list = NULL_TREE; - if (sel && c_parser_next_token_is_not (parser, CPP_COLON)) - return sel; - while (true) - { - if (!c_parser_require (parser, CPP_COLON, "expected %<:%>")) - return list; - list = chainon (list, build_tree_list (sel, NULL_TREE)); - sel = c_parser_objc_selector (parser); - if (!sel && c_parser_next_token_is_not (parser, CPP_COLON)) - break; - } - return list; -} - -/* Parse an objc-receiver. - - objc-receiver: - expression - class-name - type-name -*/ - -static tree -c_parser_objc_receiver (c_parser *parser) -{ - if (c_parser_peek_token (parser)->type == CPP_NAME - && (c_parser_peek_token (parser)->id_kind == C_ID_TYPENAME - || c_parser_peek_token (parser)->id_kind == C_ID_CLASSNAME)) - { - tree id = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - return objc_get_class_reference (id); - } - return c_parser_expression (parser).value; -} - -/* Parse objc-message-args. - - objc-message-args: - objc-selector - objc-keywordarg-list - - objc-keywordarg-list: - objc-keywordarg - objc-keywordarg-list objc-keywordarg - - objc-keywordarg: - objc-selector : objc-keywordexpr - : objc-keywordexpr -*/ - -static tree -c_parser_objc_message_args (c_parser *parser) -{ - tree sel = c_parser_objc_selector (parser); - tree list = NULL_TREE; - if (sel && c_parser_next_token_is_not (parser, CPP_COLON)) - return sel; - while (true) - { - tree keywordexpr; - if (!c_parser_require (parser, CPP_COLON, "expected %<:%>")) - return list; - keywordexpr = c_parser_objc_keywordexpr (parser); - list = chainon (list, build_tree_list (sel, keywordexpr)); - sel = c_parser_objc_selector (parser); - if (!sel && c_parser_next_token_is_not (parser, CPP_COLON)) - break; - } - return list; -} - -/* Parse an objc-keywordexpr. - - objc-keywordexpr: - nonempty-expr-list -*/ - -static tree -c_parser_objc_keywordexpr (c_parser *parser) -{ - tree list = c_parser_expr_list (parser, true); - if (TREE_CHAIN (list) == NULL_TREE) - { - /* Just return the expression, remove a level of - indirection. */ - return TREE_VALUE (list); - } - else - { - /* We have a comma expression, we will collapse later. */ - return list; - } -} - - -/* Handle pragmas. Some OpenMP pragmas are associated with, and therefore - should be considered, statements. ALLOW_STMT is true if we're within - the context of a function and such pragmas are to be allowed. Returns - true if we actually parsed such a pragma. */ - -static bool -c_parser_pragma (c_parser *parser, enum pragma_context context) -{ - unsigned int id; - - id = c_parser_peek_token (parser)->pragma_kind; - gcc_assert (id != PRAGMA_NONE); - - switch (id) - { - case PRAGMA_OMP_BARRIER: - if (context != pragma_compound) - { - if (context == pragma_stmt) - c_parser_error (parser, "%<#pragma omp barrier%> may only be " - "used in compound statements"); - goto bad_stmt; - } - c_parser_omp_barrier (parser); - return false; - - case PRAGMA_OMP_FLUSH: - if (context != pragma_compound) - { - if (context == pragma_stmt) - c_parser_error (parser, "%<#pragma omp flush%> may only be " - "used in compound statements"); - goto bad_stmt; - } - c_parser_omp_flush (parser); - return false; - - case PRAGMA_OMP_THREADPRIVATE: - c_parser_omp_threadprivate (parser); - return false; - - case PRAGMA_OMP_SECTION: - error ("%<#pragma omp section%> may only be used in " - "%<#pragma omp sections%> construct"); - c_parser_skip_until_found (parser, CPP_PRAGMA_EOL, NULL); - return false; - - case PRAGMA_GCC_PCH_PREPROCESS: - c_parser_error (parser, "%<#pragma GCC pch_preprocess%> must be first"); - c_parser_skip_until_found (parser, CPP_PRAGMA_EOL, NULL); - return false; - - default: - if (id < PRAGMA_FIRST_EXTERNAL) - { - if (context == pragma_external) - { - bad_stmt: - c_parser_error (parser, "expected declaration specifiers"); - c_parser_skip_until_found (parser, CPP_PRAGMA_EOL, NULL); - return false; - } - c_parser_omp_construct (parser); - return true; - } - break; - } - - c_parser_consume_pragma (parser); - c_invoke_pragma_handler (id); - - /* Skip to EOL, but suppress any error message. Those will have been - generated by the handler routine through calling error, as opposed - to calling c_parser_error. */ - parser->error = true; - c_parser_skip_to_pragma_eol (parser); - - return false; -} - -/* The interface the pragma parsers have to the lexer. */ - -enum cpp_ttype -pragma_lex (tree *value) -{ - c_token *tok = c_parser_peek_token (the_parser); - enum cpp_ttype ret = tok->type; - - *value = tok->value; - if (ret == CPP_PRAGMA_EOL || ret == CPP_EOF) - ret = CPP_EOF; - else - { - if (ret == CPP_KEYWORD) - ret = CPP_NAME; - c_parser_consume_token (the_parser); - } - - return ret; -} - -static void -c_parser_pragma_pch_preprocess (c_parser *parser) -{ - tree name = NULL; - - c_parser_consume_pragma (parser); - if (c_parser_next_token_is (parser, CPP_STRING)) - { - name = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - } - else - c_parser_error (parser, "expected string literal"); - c_parser_skip_to_pragma_eol (parser); - - if (name) - c_common_pch_pragma (parse_in, TREE_STRING_POINTER (name)); -} - -/* OpenMP 2.5 parsing routines. */ - -/* Returns name of the next clause. - If the clause is not recognized PRAGMA_OMP_CLAUSE_NONE is returned and - the token is not consumed. Otherwise appropriate pragma_omp_clause is - returned and the token is consumed. */ - -static pragma_omp_clause -c_parser_omp_clause_name (c_parser *parser) -{ - pragma_omp_clause result = PRAGMA_OMP_CLAUSE_NONE; - - if (c_parser_next_token_is_keyword (parser, RID_IF)) - result = PRAGMA_OMP_CLAUSE_IF; - else if (c_parser_next_token_is_keyword (parser, RID_DEFAULT)) - result = PRAGMA_OMP_CLAUSE_DEFAULT; - else if (c_parser_next_token_is (parser, CPP_NAME)) - { - const char *p = IDENTIFIER_POINTER (c_parser_peek_token (parser)->value); - - switch (p[0]) - { - case 'c': - if (!strcmp ("copyin", p)) - result = PRAGMA_OMP_CLAUSE_COPYIN; - else if (!strcmp ("copyprivate", p)) - result = PRAGMA_OMP_CLAUSE_COPYPRIVATE; - break; - case 'f': - if (!strcmp ("firstprivate", p)) - result = PRAGMA_OMP_CLAUSE_FIRSTPRIVATE; - break; - case 'l': - if (!strcmp ("lastprivate", p)) - result = PRAGMA_OMP_CLAUSE_LASTPRIVATE; - break; - case 'n': - if (!strcmp ("nowait", p)) - result = PRAGMA_OMP_CLAUSE_NOWAIT; - else if (!strcmp ("num_threads", p)) - result = PRAGMA_OMP_CLAUSE_NUM_THREADS; - break; - case 'o': - if (!strcmp ("ordered", p)) - result = PRAGMA_OMP_CLAUSE_ORDERED; - break; - case 'p': - if (!strcmp ("private", p)) - result = PRAGMA_OMP_CLAUSE_PRIVATE; - break; - case 'r': - if (!strcmp ("reduction", p)) - result = PRAGMA_OMP_CLAUSE_REDUCTION; - break; - case 's': - if (!strcmp ("schedule", p)) - result = PRAGMA_OMP_CLAUSE_SCHEDULE; - else if (!strcmp ("shared", p)) - result = PRAGMA_OMP_CLAUSE_SHARED; - break; - } - } - - if (result != PRAGMA_OMP_CLAUSE_NONE) - c_parser_consume_token (parser); - - return result; -} - -/* Validate that a clause of the given type does not already exist. */ - -static void -check_no_duplicate_clause (tree clauses, enum tree_code code, const char *name) -{ - tree c; - - for (c = clauses; c ; c = OMP_CLAUSE_CHAIN (c)) - if (OMP_CLAUSE_CODE (c) == code) - { - error ("too many %qs clauses", name); - break; - } -} - -/* OpenMP 2.5: - variable-list: - identifier - variable-list , identifier - - If KIND is nonzero, create the appropriate node and install the decl - in OMP_CLAUSE_DECL and add the node to the head of the list. - - If KIND is zero, create a TREE_LIST with the decl in TREE_PURPOSE; - return the list created. */ - -static tree -c_parser_omp_variable_list (c_parser *parser, enum omp_clause_code kind, - tree list) -{ - if (c_parser_next_token_is_not (parser, CPP_NAME) - || c_parser_peek_token (parser)->id_kind != C_ID_ID) - c_parser_error (parser, "expected identifier"); - - while (c_parser_next_token_is (parser, CPP_NAME) - && c_parser_peek_token (parser)->id_kind == C_ID_ID) - { - tree t = lookup_name (c_parser_peek_token (parser)->value); - - if (t == NULL_TREE) - undeclared_variable (c_parser_peek_token (parser)->value, - c_parser_peek_token (parser)->location); - else if (t == error_mark_node) - ; - else if (kind != 0) - { - tree u = build_omp_clause (kind); - OMP_CLAUSE_DECL (u) = t; - OMP_CLAUSE_CHAIN (u) = list; - list = u; - } - else - list = tree_cons (t, NULL_TREE, list); - - c_parser_consume_token (parser); - - if (c_parser_next_token_is_not (parser, CPP_COMMA)) - break; - - c_parser_consume_token (parser); - } - - return list; -} - -/* Similarly, but expect leading and trailing parenthesis. This is a very - common case for omp clauses. */ - -static tree -c_parser_omp_var_list_parens (c_parser *parser, enum tree_code kind, tree list) -{ - if (c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - list = c_parser_omp_variable_list (parser, kind, list); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - } - return list; -} - -/* OpenMP 2.5: - copyin ( variable-list ) */ - -static tree -c_parser_omp_clause_copyin (c_parser *parser, tree list) -{ - return c_parser_omp_var_list_parens (parser, OMP_CLAUSE_COPYIN, list); -} - -/* OpenMP 2.5: - copyprivate ( variable-list ) */ - -static tree -c_parser_omp_clause_copyprivate (c_parser *parser, tree list) -{ - return c_parser_omp_var_list_parens (parser, OMP_CLAUSE_COPYPRIVATE, list); -} - -/* OpenMP 2.5: - default ( shared | none ) */ - -static tree -c_parser_omp_clause_default (c_parser *parser, tree list) -{ - enum omp_clause_default_kind kind = OMP_CLAUSE_DEFAULT_UNSPECIFIED; - tree c; - - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - return list; - if (c_parser_next_token_is (parser, CPP_NAME)) - { - const char *p = IDENTIFIER_POINTER (c_parser_peek_token (parser)->value); - - switch (p[0]) - { - case 'n': - if (strcmp ("none", p) != 0) - goto invalid_kind; - kind = OMP_CLAUSE_DEFAULT_NONE; - break; - - case 's': - if (strcmp ("shared", p) != 0) - goto invalid_kind; - kind = OMP_CLAUSE_DEFAULT_SHARED; - break; - - default: - goto invalid_kind; - } - - c_parser_consume_token (parser); - } - else - { - invalid_kind: - c_parser_error (parser, "expected %<none%> or %<shared%>"); - } - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - - if (kind == OMP_CLAUSE_DEFAULT_UNSPECIFIED) - return list; - - check_no_duplicate_clause (list, OMP_CLAUSE_DEFAULT, "default"); - c = build_omp_clause (OMP_CLAUSE_DEFAULT); - OMP_CLAUSE_CHAIN (c) = list; - OMP_CLAUSE_DEFAULT_KIND (c) = kind; - - return c; -} - -/* OpenMP 2.5: - firstprivate ( variable-list ) */ - -static tree -c_parser_omp_clause_firstprivate (c_parser *parser, tree list) -{ - return c_parser_omp_var_list_parens (parser, OMP_CLAUSE_FIRSTPRIVATE, list); -} - -/* OpenMP 2.5: - if ( expression ) */ - -static tree -c_parser_omp_clause_if (c_parser *parser, tree list) -{ - if (c_parser_next_token_is (parser, CPP_OPEN_PAREN)) - { - tree t = c_parser_paren_condition (parser); - tree c; - - check_no_duplicate_clause (list, OMP_CLAUSE_IF, "if"); - - c = build_omp_clause (OMP_CLAUSE_IF); - OMP_CLAUSE_IF_EXPR (c) = t; - OMP_CLAUSE_CHAIN (c) = list; - list = c; - } - else - c_parser_error (parser, "expected %<(%>"); - - return list; -} - -/* OpenMP 2.5: - lastprivate ( variable-list ) */ - -static tree -c_parser_omp_clause_lastprivate (c_parser *parser, tree list) -{ - return c_parser_omp_var_list_parens (parser, OMP_CLAUSE_LASTPRIVATE, list); -} - -/* OpenMP 2.5: - nowait */ - -static tree -c_parser_omp_clause_nowait (c_parser *parser ATTRIBUTE_UNUSED, tree list) -{ - tree c; - - check_no_duplicate_clause (list, OMP_CLAUSE_NOWAIT, "nowait"); - - c = build_omp_clause (OMP_CLAUSE_NOWAIT); - OMP_CLAUSE_CHAIN (c) = list; - return c; -} - -/* OpenMP 2.5: - num_threads ( expression ) */ - -static tree -c_parser_omp_clause_num_threads (c_parser *parser, tree list) -{ - if (c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - tree c, t = c_parser_expression (parser).value; - - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - - if (!INTEGRAL_TYPE_P (TREE_TYPE (t))) - { - c_parser_error (parser, "expected integer expression"); - return list; - } - - /* Attempt to statically determine when the number isn't positive. */ - c = fold_build2 (LE_EXPR, boolean_type_node, t, - build_int_cst (TREE_TYPE (t), 0)); - if (c == boolean_true_node) - { - warning (0, "%<num_threads%> value must be positive"); - t = integer_one_node; - } - - check_no_duplicate_clause (list, OMP_CLAUSE_NUM_THREADS, "num_threads"); - - c = build_omp_clause (OMP_CLAUSE_NUM_THREADS); - OMP_CLAUSE_NUM_THREADS_EXPR (c) = t; - OMP_CLAUSE_CHAIN (c) = list; - list = c; - } - - return list; -} - -/* OpenMP 2.5: - ordered */ - -static tree -c_parser_omp_clause_ordered (c_parser *parser ATTRIBUTE_UNUSED, tree list) -{ - tree c; - - check_no_duplicate_clause (list, OMP_CLAUSE_ORDERED, "ordered"); - - c = build_omp_clause (OMP_CLAUSE_ORDERED); - OMP_CLAUSE_CHAIN (c) = list; - return c; -} - -/* OpenMP 2.5: - private ( variable-list ) */ - -static tree -c_parser_omp_clause_private (c_parser *parser, tree list) -{ - return c_parser_omp_var_list_parens (parser, OMP_CLAUSE_PRIVATE, list); -} - -/* OpenMP 2.5: - reduction ( reduction-operator : variable-list ) - - reduction-operator: - One of: + * - & ^ | && || */ - -static tree -c_parser_omp_clause_reduction (c_parser *parser, tree list) -{ - if (c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - { - enum tree_code code; - - switch (c_parser_peek_token (parser)->type) - { - case CPP_PLUS: - code = PLUS_EXPR; - break; - case CPP_MULT: - code = MULT_EXPR; - break; - case CPP_MINUS: - code = MINUS_EXPR; - break; - case CPP_AND: - code = BIT_AND_EXPR; - break; - case CPP_XOR: - code = BIT_XOR_EXPR; - break; - case CPP_OR: - code = BIT_IOR_EXPR; - break; - case CPP_AND_AND: - code = TRUTH_ANDIF_EXPR; - break; - case CPP_OR_OR: - code = TRUTH_ORIF_EXPR; - break; - default: - c_parser_error (parser, - "expected %<+%>, %<*%>, %<-%>, %<&%>, " - "%<^%>, %<|%>, %<&&%>, or %<||%>"); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, 0); - return list; - } - c_parser_consume_token (parser); - if (c_parser_require (parser, CPP_COLON, "expected %<:%>")) - { - tree nl, c; - - nl = c_parser_omp_variable_list (parser, OMP_CLAUSE_REDUCTION, list); - for (c = nl; c != list; c = OMP_CLAUSE_CHAIN (c)) - OMP_CLAUSE_REDUCTION_CODE (c) = code; - - list = nl; - } - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - } - return list; -} - -/* OpenMP 2.5: - schedule ( schedule-kind ) - schedule ( schedule-kind , expression ) - - schedule-kind: - static | dynamic | guided | runtime -*/ - -static tree -c_parser_omp_clause_schedule (c_parser *parser, tree list) -{ - tree c, t; - - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - return list; - - c = build_omp_clause (OMP_CLAUSE_SCHEDULE); - - if (c_parser_next_token_is (parser, CPP_NAME)) - { - tree kind = c_parser_peek_token (parser)->value; - const char *p = IDENTIFIER_POINTER (kind); - - switch (p[0]) - { - case 'd': - if (strcmp ("dynamic", p) != 0) - goto invalid_kind; - OMP_CLAUSE_SCHEDULE_KIND (c) = OMP_CLAUSE_SCHEDULE_DYNAMIC; - break; - - case 'g': - if (strcmp ("guided", p) != 0) - goto invalid_kind; - OMP_CLAUSE_SCHEDULE_KIND (c) = OMP_CLAUSE_SCHEDULE_GUIDED; - break; - - case 'r': - if (strcmp ("runtime", p) != 0) - goto invalid_kind; - OMP_CLAUSE_SCHEDULE_KIND (c) = OMP_CLAUSE_SCHEDULE_RUNTIME; - break; - - default: - goto invalid_kind; - } - } - else if (c_parser_next_token_is_keyword (parser, RID_STATIC)) - OMP_CLAUSE_SCHEDULE_KIND (c) = OMP_CLAUSE_SCHEDULE_STATIC; - else - goto invalid_kind; - - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_COMMA)) - { - c_parser_consume_token (parser); - - t = c_parser_expr_no_commas (parser, NULL).value; - - if (OMP_CLAUSE_SCHEDULE_KIND (c) == OMP_CLAUSE_SCHEDULE_RUNTIME) - error ("schedule %<runtime%> does not take " - "a %<chunk_size%> parameter"); - else if (TREE_CODE (TREE_TYPE (t)) == INTEGER_TYPE) - OMP_CLAUSE_SCHEDULE_CHUNK_EXPR (c) = t; - else - c_parser_error (parser, "expected integer expression"); - - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - } - else - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, - "expected %<,%> or %<)%>"); - - check_no_duplicate_clause (list, OMP_CLAUSE_SCHEDULE, "schedule"); - OMP_CLAUSE_CHAIN (c) = list; - return c; - - invalid_kind: - c_parser_error (parser, "invalid schedule kind"); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, 0); - return list; -} - -/* OpenMP 2.5: - shared ( variable-list ) */ - -static tree -c_parser_omp_clause_shared (c_parser *parser, tree list) -{ - return c_parser_omp_var_list_parens (parser, OMP_CLAUSE_SHARED, list); -} - -/* Parse all OpenMP clauses. The set clauses allowed by the directive - is a bitmask in MASK. Return the list of clauses found; the result - of clause default goes in *pdefault. */ - -static tree -c_parser_omp_all_clauses (c_parser *parser, unsigned int mask, - const char *where) -{ - tree clauses = NULL; - - while (c_parser_next_token_is_not (parser, CPP_PRAGMA_EOL)) - { - const pragma_omp_clause c_kind = c_parser_omp_clause_name (parser); - const char *c_name; - tree prev = clauses; - - switch (c_kind) - { - case PRAGMA_OMP_CLAUSE_COPYIN: - clauses = c_parser_omp_clause_copyin (parser, clauses); - c_name = "copyin"; - break; - case PRAGMA_OMP_CLAUSE_COPYPRIVATE: - clauses = c_parser_omp_clause_copyprivate (parser, clauses); - c_name = "copyprivate"; - break; - case PRAGMA_OMP_CLAUSE_DEFAULT: - clauses = c_parser_omp_clause_default (parser, clauses); - c_name = "default"; - break; - case PRAGMA_OMP_CLAUSE_FIRSTPRIVATE: - clauses = c_parser_omp_clause_firstprivate (parser, clauses); - c_name = "firstprivate"; - break; - case PRAGMA_OMP_CLAUSE_IF: - clauses = c_parser_omp_clause_if (parser, clauses); - c_name = "if"; - break; - case PRAGMA_OMP_CLAUSE_LASTPRIVATE: - clauses = c_parser_omp_clause_lastprivate (parser, clauses); - c_name = "lastprivate"; - break; - case PRAGMA_OMP_CLAUSE_NOWAIT: - clauses = c_parser_omp_clause_nowait (parser, clauses); - c_name = "nowait"; - break; - case PRAGMA_OMP_CLAUSE_NUM_THREADS: - clauses = c_parser_omp_clause_num_threads (parser, clauses); - c_name = "num_threads"; - break; - case PRAGMA_OMP_CLAUSE_ORDERED: - clauses = c_parser_omp_clause_ordered (parser, clauses); - c_name = "ordered"; - break; - case PRAGMA_OMP_CLAUSE_PRIVATE: - clauses = c_parser_omp_clause_private (parser, clauses); - c_name = "private"; - break; - case PRAGMA_OMP_CLAUSE_REDUCTION: - clauses = c_parser_omp_clause_reduction (parser, clauses); - c_name = "reduction"; - break; - case PRAGMA_OMP_CLAUSE_SCHEDULE: - clauses = c_parser_omp_clause_schedule (parser, clauses); - c_name = "schedule"; - break; - case PRAGMA_OMP_CLAUSE_SHARED: - clauses = c_parser_omp_clause_shared (parser, clauses); - c_name = "shared"; - break; - default: - c_parser_error (parser, "expected %<#pragma omp%> clause"); - goto saw_error; - } - - if (((mask >> c_kind) & 1) == 0 && !parser->error) - { - /* Remove the invalid clause(s) from the list to avoid - confusing the rest of the compiler. */ - clauses = prev; - error ("%qs is not valid for %qs", c_name, where); - } - } - - saw_error: - c_parser_skip_to_pragma_eol (parser); - - return c_finish_omp_clauses (clauses); -} - -/* OpenMP 2.5: - structured-block: - statement - - In practice, we're also interested in adding the statement to an - outer node. So it is convenient if we work around the fact that - c_parser_statement calls add_stmt. */ - -static tree -c_parser_omp_structured_block (c_parser *parser) -{ - tree stmt = push_stmt_list (); - c_parser_statement (parser); - return pop_stmt_list (stmt); -} - -/* OpenMP 2.5: - # pragma omp atomic new-line - expression-stmt - - expression-stmt: - x binop= expr | x++ | ++x | x-- | --x - binop: - +, *, -, /, &, ^, |, <<, >> - - where x is an lvalue expression with scalar type. */ - -static void -c_parser_omp_atomic (c_parser *parser) -{ - tree lhs, rhs; - tree stmt; - enum tree_code code; - - c_parser_skip_to_pragma_eol (parser); - - lhs = c_parser_unary_expression (parser).value; - switch (TREE_CODE (lhs)) - { - case ERROR_MARK: - saw_error: - c_parser_skip_to_end_of_block_or_statement (parser); - return; - - case PREINCREMENT_EXPR: - case POSTINCREMENT_EXPR: - lhs = TREE_OPERAND (lhs, 0); - code = PLUS_EXPR; - rhs = integer_one_node; - break; - - case PREDECREMENT_EXPR: - case POSTDECREMENT_EXPR: - lhs = TREE_OPERAND (lhs, 0); - code = MINUS_EXPR; - rhs = integer_one_node; - break; - - default: - switch (c_parser_peek_token (parser)->type) - { - case CPP_MULT_EQ: - code = MULT_EXPR; - break; - case CPP_DIV_EQ: - code = TRUNC_DIV_EXPR; - break; - case CPP_PLUS_EQ: - code = PLUS_EXPR; - break; - case CPP_MINUS_EQ: - code = MINUS_EXPR; - break; - case CPP_LSHIFT_EQ: - code = LSHIFT_EXPR; - break; - case CPP_RSHIFT_EQ: - code = RSHIFT_EXPR; - break; - case CPP_AND_EQ: - code = BIT_AND_EXPR; - break; - case CPP_OR_EQ: - code = BIT_IOR_EXPR; - break; - case CPP_XOR_EQ: - code = BIT_XOR_EXPR; - break; - default: - c_parser_error (parser, - "invalid operator for %<#pragma omp atomic%>"); - goto saw_error; - } - - c_parser_consume_token (parser); - rhs = c_parser_expression (parser).value; - break; - } - stmt = c_finish_omp_atomic (code, lhs, rhs); - if (stmt != error_mark_node) - add_stmt (stmt); - c_parser_skip_until_found (parser, CPP_SEMICOLON, "expected %<;%>"); -} - - -/* OpenMP 2.5: - # pragma omp barrier new-line -*/ - -static void -c_parser_omp_barrier (c_parser *parser) -{ - c_parser_consume_pragma (parser); - c_parser_skip_to_pragma_eol (parser); - - c_finish_omp_barrier (); -} - -/* OpenMP 2.5: - # pragma omp critical [(name)] new-line - structured-block -*/ - -static tree -c_parser_omp_critical (c_parser *parser) -{ - tree stmt, name = NULL; - - if (c_parser_next_token_is (parser, CPP_OPEN_PAREN)) - { - c_parser_consume_token (parser); - if (c_parser_next_token_is (parser, CPP_NAME)) - { - name = c_parser_peek_token (parser)->value; - c_parser_consume_token (parser); - c_parser_require (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - } - else - c_parser_error (parser, "expected identifier"); - } - else if (c_parser_next_token_is_not (parser, CPP_PRAGMA_EOL)) - c_parser_error (parser, "expected %<(%> or end of line"); - c_parser_skip_to_pragma_eol (parser); - - stmt = c_parser_omp_structured_block (parser); - return c_finish_omp_critical (stmt, name); -} - -/* OpenMP 2.5: - # pragma omp flush flush-vars[opt] new-line - - flush-vars: - ( variable-list ) */ - -static void -c_parser_omp_flush (c_parser *parser) -{ - c_parser_consume_pragma (parser); - if (c_parser_next_token_is (parser, CPP_OPEN_PAREN)) - c_parser_omp_var_list_parens (parser, 0, NULL); - else if (c_parser_next_token_is_not (parser, CPP_PRAGMA_EOL)) - c_parser_error (parser, "expected %<(%> or end of line"); - c_parser_skip_to_pragma_eol (parser); - - c_finish_omp_flush (); -} - -/* Parse the restricted form of the for statment allowed by OpenMP. - The real trick here is to determine the loop control variable early - so that we can push a new decl if necessary to make it private. */ - -static tree -c_parser_omp_for_loop (c_parser *parser) -{ - tree decl, cond, incr, save_break, save_cont, body, init; - location_t loc; - - if (!c_parser_next_token_is_keyword (parser, RID_FOR)) - { - c_parser_error (parser, "for statement expected"); - return NULL; - } - loc = c_parser_peek_token (parser)->location; - c_parser_consume_token (parser); - - if (!c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>")) - return NULL; - - /* Parse the initialization declaration or expression. */ - if (c_parser_next_token_starts_declspecs (parser)) - { - c_parser_declaration_or_fndef (parser, true, true, true, true); - decl = check_for_loop_decls (); - if (decl == NULL) - goto error_init; - init = decl; - } - else if (c_parser_next_token_is (parser, CPP_NAME) - && c_parser_peek_2nd_token (parser)->type == CPP_EQ) - { - decl = c_parser_postfix_expression (parser).value; - - c_parser_require (parser, CPP_EQ, "expected %<=%>"); - - init = c_parser_expr_no_commas (parser, NULL).value; - init = build_modify_expr (decl, NOP_EXPR, init); - init = c_process_expr_stmt (init); - - c_parser_skip_until_found (parser, CPP_SEMICOLON, "expected %<;%>"); - } - else - goto error_init; - - /* Parse the loop condition. */ - cond = NULL_TREE; - if (c_parser_next_token_is_not (parser, CPP_SEMICOLON)) - { - cond = c_parser_expression_conv (parser).value; - cond = c_objc_common_truthvalue_conversion (cond); - if (EXPR_P (cond)) - SET_EXPR_LOCATION (cond, input_location); - } - c_parser_skip_until_found (parser, CPP_SEMICOLON, "expected %<;%>"); - - /* Parse the increment expression. */ - incr = NULL_TREE; - if (c_parser_next_token_is_not (parser, CPP_CLOSE_PAREN)) - incr = c_process_expr_stmt (c_parser_expression (parser).value); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - - parse_body: - save_break = c_break_label; - c_break_label = size_one_node; - save_cont = c_cont_label; - c_cont_label = NULL_TREE; - body = push_stmt_list (); - - add_stmt (c_parser_c99_block_statement (parser)); - if (c_cont_label) - add_stmt (build1 (LABEL_EXPR, void_type_node, c_cont_label)); - - body = pop_stmt_list (body); - c_break_label = save_break; - c_cont_label = save_cont; - - /* Only bother calling c_finish_omp_for if we havn't already generated - an error from the initialization parsing. */ - if (decl != NULL && decl != error_mark_node && init != error_mark_node) - return c_finish_omp_for (loc, decl, init, cond, incr, body, NULL); - return NULL; - - error_init: - c_parser_error (parser, "expected iteration declaration or initialization"); - c_parser_skip_until_found (parser, CPP_CLOSE_PAREN, "expected %<)%>"); - decl = init = cond = incr = NULL_TREE; - goto parse_body; -} - -/* OpenMP 2.5: - #pragma omp for for-clause[optseq] new-line - for-loop -*/ - -#define OMP_FOR_CLAUSE_MASK \ - ( (1u << PRAGMA_OMP_CLAUSE_PRIVATE) \ - | (1u << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \ - | (1u << PRAGMA_OMP_CLAUSE_LASTPRIVATE) \ - | (1u << PRAGMA_OMP_CLAUSE_REDUCTION) \ - | (1u << PRAGMA_OMP_CLAUSE_ORDERED) \ - | (1u << PRAGMA_OMP_CLAUSE_SCHEDULE) \ - | (1u << PRAGMA_OMP_CLAUSE_NOWAIT)) - -static tree -c_parser_omp_for (c_parser *parser) -{ - tree block, clauses, ret; - - clauses = c_parser_omp_all_clauses (parser, OMP_FOR_CLAUSE_MASK, - "#pragma omp for"); - - block = c_begin_compound_stmt (true); - ret = c_parser_omp_for_loop (parser); - if (ret) - OMP_FOR_CLAUSES (ret) = clauses; - block = c_end_compound_stmt (block, true); - add_stmt (block); - - return ret; -} - -/* OpenMP 2.5: - # pragma omp master new-line - structured-block -*/ - -static tree -c_parser_omp_master (c_parser *parser) -{ - c_parser_skip_to_pragma_eol (parser); - return c_finish_omp_master (c_parser_omp_structured_block (parser)); -} - -/* OpenMP 2.5: - # pragma omp ordered new-line - structured-block -*/ - -static tree -c_parser_omp_ordered (c_parser *parser) -{ - c_parser_skip_to_pragma_eol (parser); - return c_finish_omp_ordered (c_parser_omp_structured_block (parser)); -} - -/* OpenMP 2.5: - - section-scope: - { section-sequence } - - section-sequence: - section-directive[opt] structured-block - section-sequence section-directive structured-block */ - -static tree -c_parser_omp_sections_scope (c_parser *parser) -{ - tree stmt, substmt; - bool error_suppress = false; - location_t loc; - - if (!c_parser_require (parser, CPP_OPEN_BRACE, "expected %<{%>")) - { - /* Avoid skipping until the end of the block. */ - parser->error = false; - return NULL_TREE; - } - - stmt = push_stmt_list (); - - loc = c_parser_peek_token (parser)->location; - if (c_parser_peek_token (parser)->pragma_kind != PRAGMA_OMP_SECTION) - { - substmt = push_stmt_list (); - - while (1) - { - c_parser_statement (parser); - - if (c_parser_peek_token (parser)->pragma_kind == PRAGMA_OMP_SECTION) - break; - if (c_parser_next_token_is (parser, CPP_CLOSE_BRACE)) - break; - if (c_parser_next_token_is (parser, CPP_EOF)) - break; - } - - substmt = pop_stmt_list (substmt); - substmt = build1 (OMP_SECTION, void_type_node, substmt); - SET_EXPR_LOCATION (substmt, loc); - add_stmt (substmt); - } - - while (1) - { - if (c_parser_next_token_is (parser, CPP_CLOSE_BRACE)) - break; - if (c_parser_next_token_is (parser, CPP_EOF)) - break; - - loc = c_parser_peek_token (parser)->location; - if (c_parser_peek_token (parser)->pragma_kind == PRAGMA_OMP_SECTION) - { - c_parser_consume_pragma (parser); - c_parser_skip_to_pragma_eol (parser); - error_suppress = false; - } - else if (!error_suppress) - { - error ("expected %<#pragma omp section%> or %<}%>"); - error_suppress = true; - } - - substmt = c_parser_omp_structured_block (parser); - substmt = build1 (OMP_SECTION, void_type_node, substmt); - SET_EXPR_LOCATION (substmt, loc); - add_stmt (substmt); - } - c_parser_skip_until_found (parser, CPP_CLOSE_BRACE, - "expected %<#pragma omp section%> or %<}%>"); - - substmt = pop_stmt_list (stmt); - - stmt = make_node (OMP_SECTIONS); - TREE_TYPE (stmt) = void_type_node; - OMP_SECTIONS_BODY (stmt) = substmt; - - return add_stmt (stmt); -} - -/* OpenMP 2.5: - # pragma omp sections sections-clause[optseq] newline - sections-scope -*/ - -#define OMP_SECTIONS_CLAUSE_MASK \ - ( (1u << PRAGMA_OMP_CLAUSE_PRIVATE) \ - | (1u << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \ - | (1u << PRAGMA_OMP_CLAUSE_LASTPRIVATE) \ - | (1u << PRAGMA_OMP_CLAUSE_REDUCTION) \ - | (1u << PRAGMA_OMP_CLAUSE_NOWAIT)) - -static tree -c_parser_omp_sections (c_parser *parser) -{ - tree block, clauses, ret; - - clauses = c_parser_omp_all_clauses (parser, OMP_SECTIONS_CLAUSE_MASK, - "#pragma omp sections"); - - block = c_begin_compound_stmt (true); - ret = c_parser_omp_sections_scope (parser); - if (ret) - OMP_SECTIONS_CLAUSES (ret) = clauses; - block = c_end_compound_stmt (block, true); - add_stmt (block); - - return ret; -} - -/* OpenMP 2.5: - # pragma parallel parallel-clause new-line - # pragma parallel for parallel-for-clause new-line - # pragma parallel sections parallel-sections-clause new-line -*/ - -#define OMP_PARALLEL_CLAUSE_MASK \ - ( (1u << PRAGMA_OMP_CLAUSE_IF) \ - | (1u << PRAGMA_OMP_CLAUSE_PRIVATE) \ - | (1u << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \ - | (1u << PRAGMA_OMP_CLAUSE_DEFAULT) \ - | (1u << PRAGMA_OMP_CLAUSE_SHARED) \ - | (1u << PRAGMA_OMP_CLAUSE_COPYIN) \ - | (1u << PRAGMA_OMP_CLAUSE_REDUCTION) \ - | (1u << PRAGMA_OMP_CLAUSE_NUM_THREADS)) - -static tree -c_parser_omp_parallel (c_parser *parser) -{ - enum pragma_kind p_kind = PRAGMA_OMP_PARALLEL; - const char *p_name = "#pragma omp parallel"; - tree stmt, clauses, par_clause, ws_clause, block; - unsigned int mask = OMP_PARALLEL_CLAUSE_MASK; - - if (c_parser_next_token_is_keyword (parser, RID_FOR)) - { - c_parser_consume_token (parser); - p_kind = PRAGMA_OMP_PARALLEL_FOR; - p_name = "#pragma omp parallel for"; - mask |= OMP_FOR_CLAUSE_MASK; - mask &= ~(1u << PRAGMA_OMP_CLAUSE_NOWAIT); - } - else if (c_parser_next_token_is (parser, CPP_NAME)) - { - const char *p = IDENTIFIER_POINTER (c_parser_peek_token (parser)->value); - if (strcmp (p, "sections") == 0) - { - c_parser_consume_token (parser); - p_kind = PRAGMA_OMP_PARALLEL_SECTIONS; - p_name = "#pragma omp parallel sections"; - mask |= OMP_SECTIONS_CLAUSE_MASK; - mask &= ~(1u << PRAGMA_OMP_CLAUSE_NOWAIT); - } - } - - clauses = c_parser_omp_all_clauses (parser, mask, p_name); - - switch (p_kind) - { - case PRAGMA_OMP_PARALLEL: - block = c_begin_omp_parallel (); - c_parser_statement (parser); - stmt = c_finish_omp_parallel (clauses, block); - break; - - case PRAGMA_OMP_PARALLEL_FOR: - block = c_begin_omp_parallel (); - c_split_parallel_clauses (clauses, &par_clause, &ws_clause); - stmt = c_parser_omp_for_loop (parser); - if (stmt) - OMP_FOR_CLAUSES (stmt) = ws_clause; - stmt = c_finish_omp_parallel (par_clause, block); - OMP_PARALLEL_COMBINED (stmt) = 1; - break; - - case PRAGMA_OMP_PARALLEL_SECTIONS: - block = c_begin_omp_parallel (); - c_split_parallel_clauses (clauses, &par_clause, &ws_clause); - stmt = c_parser_omp_sections_scope (parser); - if (stmt) - OMP_SECTIONS_CLAUSES (stmt) = ws_clause; - stmt = c_finish_omp_parallel (par_clause, block); - OMP_PARALLEL_COMBINED (stmt) = 1; - break; - - default: - gcc_unreachable (); - } - - return stmt; -} - -/* OpenMP 2.5: - # pragma omp single single-clause[optseq] new-line - structured-block -*/ - -#define OMP_SINGLE_CLAUSE_MASK \ - ( (1u << PRAGMA_OMP_CLAUSE_PRIVATE) \ - | (1u << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \ - | (1u << PRAGMA_OMP_CLAUSE_COPYPRIVATE) \ - | (1u << PRAGMA_OMP_CLAUSE_NOWAIT)) - -static tree -c_parser_omp_single (c_parser *parser) -{ - tree stmt = make_node (OMP_SINGLE); - TREE_TYPE (stmt) = void_type_node; - - OMP_SINGLE_CLAUSES (stmt) - = c_parser_omp_all_clauses (parser, OMP_SINGLE_CLAUSE_MASK, - "#pragma omp single"); - OMP_SINGLE_BODY (stmt) = c_parser_omp_structured_block (parser); - - return add_stmt (stmt); -} - - -/* Main entry point to parsing most OpenMP pragmas. */ - -static void -c_parser_omp_construct (c_parser *parser) -{ - enum pragma_kind p_kind; - location_t loc; - tree stmt; - - loc = c_parser_peek_token (parser)->location; - p_kind = c_parser_peek_token (parser)->pragma_kind; - c_parser_consume_pragma (parser); - - /* For all constructs below except #pragma omp atomic - MUST_NOT_THROW catch handlers are needed when exceptions - are enabled. */ - if (p_kind != PRAGMA_OMP_ATOMIC) - c_maybe_initialize_eh (); - - switch (p_kind) - { - case PRAGMA_OMP_ATOMIC: - c_parser_omp_atomic (parser); - return; - case PRAGMA_OMP_CRITICAL: - stmt = c_parser_omp_critical (parser); - break; - case PRAGMA_OMP_FOR: - stmt = c_parser_omp_for (parser); - break; - case PRAGMA_OMP_MASTER: - stmt = c_parser_omp_master (parser); - break; - case PRAGMA_OMP_ORDERED: - stmt = c_parser_omp_ordered (parser); - break; - case PRAGMA_OMP_PARALLEL: - stmt = c_parser_omp_parallel (parser); - break; - case PRAGMA_OMP_SECTIONS: - stmt = c_parser_omp_sections (parser); - break; - case PRAGMA_OMP_SINGLE: - stmt = c_parser_omp_single (parser); - break; - default: - gcc_unreachable (); - } - - if (stmt) - SET_EXPR_LOCATION (stmt, loc); -} - - -/* OpenMP 2.5: - # pragma omp threadprivate (variable-list) */ - -static void -c_parser_omp_threadprivate (c_parser *parser) -{ - tree vars, t; - - c_parser_consume_pragma (parser); - vars = c_parser_omp_var_list_parens (parser, 0, NULL); - - if (!targetm.have_tls) - sorry ("threadprivate variables not supported in this target"); - - /* Mark every variable in VARS to be assigned thread local storage. */ - for (t = vars; t; t = TREE_CHAIN (t)) - { - tree v = TREE_PURPOSE (t); - - /* If V had already been marked threadprivate, it doesn't matter - whether it had been used prior to this point. */ - if (TREE_USED (v) && !C_DECL_THREADPRIVATE_P (v)) - error ("%qE declared %<threadprivate%> after first use", v); - else if (! TREE_STATIC (v) && ! DECL_EXTERNAL (v)) - error ("automatic variable %qE cannot be %<threadprivate%>", v); - else if (! COMPLETE_TYPE_P (TREE_TYPE (v))) - error ("%<threadprivate%> %qE has incomplete type", v); - else - { - if (! DECL_THREAD_LOCAL_P (v)) - { - DECL_TLS_MODEL (v) = decl_default_tls_model (v); - /* If rtl has been already set for this var, call - make_decl_rtl once again, so that encode_section_info - has a chance to look at the new decl flags. */ - if (DECL_RTL_SET_P (v)) - make_decl_rtl (v); - } - C_DECL_THREADPRIVATE_P (v) = 1; - } - } - - c_parser_skip_to_pragma_eol (parser); -} - - -/* Parse a single source file. */ - -void -c_parse_file (void) -{ - /* Use local storage to begin. If the first token is a pragma, parse it. - If it is #pragma GCC pch_preprocess, then this will load a PCH file - which will cause garbage collection. */ - c_parser tparser; - - memset (&tparser, 0, sizeof tparser); - the_parser = &tparser; - - if (c_parser_peek_token (&tparser)->pragma_kind == PRAGMA_GCC_PCH_PREPROCESS) - c_parser_pragma_pch_preprocess (&tparser); - - the_parser = GGC_NEW (c_parser); - *the_parser = tparser; - - c_parser_translation_unit (the_parser); - the_parser = NULL; -} - -#include "gt-c-parser.h" |