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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [libcpp/] [macro.c] - Rev 861
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/* Part of CPP library. (Macro and #define handling.) Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. Written by Per Bothner, 1994. Based on CCCP program by Paul Rubin, June 1986 Adapted to ANSI C, Richard Stallman, Jan 1987 This program 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 3, or (at your option) any later version. This program 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 this program; see the file COPYING3. If not see <http://www.gnu.org/licenses/>. In other words, you are welcome to use, share and improve this program. You are forbidden to forbid anyone else to use, share and improve what you give them. Help stamp out software-hoarding! */ #include "config.h" #include "system.h" #include "cpplib.h" #include "internal.h" typedef struct macro_arg macro_arg; struct macro_arg { const cpp_token **first; /* First token in unexpanded argument. */ const cpp_token **expanded; /* Macro-expanded argument. */ const cpp_token *stringified; /* Stringified argument. */ unsigned int count; /* # of tokens in argument. */ unsigned int expanded_count; /* # of tokens in expanded argument. */ }; /* Macro expansion. */ static int enter_macro_context (cpp_reader *, cpp_hashnode *, const cpp_token *); static int builtin_macro (cpp_reader *, cpp_hashnode *); static void push_ptoken_context (cpp_reader *, cpp_hashnode *, _cpp_buff *, const cpp_token **, unsigned int); static _cpp_buff *collect_args (cpp_reader *, const cpp_hashnode *, _cpp_buff **); static cpp_context *next_context (cpp_reader *); static const cpp_token *padding_token (cpp_reader *, const cpp_token *); static void expand_arg (cpp_reader *, macro_arg *); static const cpp_token *new_string_token (cpp_reader *, uchar *, unsigned int); static const cpp_token *stringify_arg (cpp_reader *, macro_arg *); static void paste_all_tokens (cpp_reader *, const cpp_token *); static bool paste_tokens (cpp_reader *, const cpp_token **, const cpp_token *); static void replace_args (cpp_reader *, cpp_hashnode *, cpp_macro *, macro_arg *); static _cpp_buff *funlike_invocation_p (cpp_reader *, cpp_hashnode *, _cpp_buff **); static bool create_iso_definition (cpp_reader *, cpp_macro *); /* #define directive parsing and handling. */ static cpp_token *alloc_expansion_token (cpp_reader *, cpp_macro *); static cpp_token *lex_expansion_token (cpp_reader *, cpp_macro *); static bool warn_of_redefinition (cpp_reader *, const cpp_hashnode *, const cpp_macro *); static bool parse_params (cpp_reader *, cpp_macro *); static void check_trad_stringification (cpp_reader *, const cpp_macro *, const cpp_string *); /* Emits a warning if NODE is a macro defined in the main file that has not been used. */ int _cpp_warn_if_unused_macro (cpp_reader *pfile, cpp_hashnode *node, void *v ATTRIBUTE_UNUSED) { if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN)) { cpp_macro *macro = node->value.macro; if (!macro->used && MAIN_FILE_P (linemap_lookup (pfile->line_table, macro->line))) cpp_error_with_line (pfile, CPP_DL_WARNING, macro->line, 0, "macro \"%s\" is not used", NODE_NAME (node)); } return 1; } /* Allocates and returns a CPP_STRING token, containing TEXT of length LEN, after null-terminating it. TEXT must be in permanent storage. */ static const cpp_token * new_string_token (cpp_reader *pfile, unsigned char *text, unsigned int len) { cpp_token *token = _cpp_temp_token (pfile); text[len] = '\0'; token->type = CPP_STRING; token->val.str.len = len; token->val.str.text = text; token->flags = 0; return token; } static const char * const monthnames[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; /* Helper function for builtin_macro. Returns the text generated by a builtin macro. */ const uchar * _cpp_builtin_macro_text (cpp_reader *pfile, cpp_hashnode *node) { const struct line_map *map; const uchar *result = NULL; linenum_type number = 1; switch (node->value.builtin) { default: cpp_error (pfile, CPP_DL_ICE, "invalid built-in macro \"%s\"", NODE_NAME (node)); break; case BT_TIMESTAMP: { cpp_buffer *pbuffer = cpp_get_buffer (pfile); if (pbuffer->timestamp == NULL) { /* Initialize timestamp value of the assotiated file. */ struct _cpp_file *file = cpp_get_file (pbuffer); if (file) { /* Generate __TIMESTAMP__ string, that represents the date and time of the last modification of the current source file. The string constant looks like "Sun Sep 16 01:03:52 1973". */ struct tm *tb = NULL; struct stat *st = _cpp_get_file_stat (file); if (st) tb = localtime (&st->st_mtime); if (tb) { char *str = asctime (tb); size_t len = strlen (str); unsigned char *buf = _cpp_unaligned_alloc (pfile, len + 2); buf[0] = '"'; strcpy ((char *) buf + 1, str); buf[len] = '"'; pbuffer->timestamp = buf; } else { cpp_errno (pfile, CPP_DL_WARNING, "could not determine file timestamp"); pbuffer->timestamp = UC"\"??? ??? ?? ??:??:?? ????\""; } } } result = pbuffer->timestamp; } break; case BT_FILE: case BT_BASE_FILE: { unsigned int len; const char *name; uchar *buf; map = linemap_lookup (pfile->line_table, pfile->line_table->highest_line); if (node->value.builtin == BT_BASE_FILE) while (! MAIN_FILE_P (map)) map = INCLUDED_FROM (pfile->line_table, map); name = map->to_file; len = strlen (name); buf = _cpp_unaligned_alloc (pfile, len * 2 + 3); result = buf; *buf = '"'; buf = cpp_quote_string (buf + 1, (const unsigned char *) name, len); *buf++ = '"'; *buf = '\0'; } break; case BT_INCLUDE_LEVEL: /* The line map depth counts the primary source as level 1, but historically __INCLUDE_DEPTH__ has called the primary source level 0. */ number = pfile->line_table->depth - 1; break; case BT_SPECLINE: map = &pfile->line_table->maps[pfile->line_table->used-1]; /* If __LINE__ is embedded in a macro, it must expand to the line of the macro's invocation, not its definition. Otherwise things like assert() will not work properly. */ number = SOURCE_LINE (map, CPP_OPTION (pfile, traditional) ? pfile->line_table->highest_line : pfile->cur_token[-1].src_loc); break; /* __STDC__ has the value 1 under normal circumstances. However, if (a) we are in a system header, (b) the option stdc_0_in_system_headers is true (set by target config), and (c) we are not in strictly conforming mode, then it has the value 0. (b) and (c) are already checked in cpp_init_builtins. */ case BT_STDC: if (cpp_in_system_header (pfile)) number = 0; else number = 1; break; case BT_DATE: case BT_TIME: if (pfile->date == NULL) { /* Allocate __DATE__ and __TIME__ strings from permanent storage. We only do this once, and don't generate them at init time, because time() and localtime() are very slow on some systems. */ time_t tt; struct tm *tb = NULL; /* (time_t) -1 is a legitimate value for "number of seconds since the Epoch", so we have to do a little dance to distinguish that from a genuine error. */ errno = 0; tt = time(NULL); if (tt != (time_t)-1 || errno == 0) tb = localtime (&tt); if (tb) { pfile->date = _cpp_unaligned_alloc (pfile, sizeof ("\"Oct 11 1347\"")); sprintf ((char *) pfile->date, "\"%s %2d %4d\"", monthnames[tb->tm_mon], tb->tm_mday, tb->tm_year + 1900); pfile->time = _cpp_unaligned_alloc (pfile, sizeof ("\"12:34:56\"")); sprintf ((char *) pfile->time, "\"%02d:%02d:%02d\"", tb->tm_hour, tb->tm_min, tb->tm_sec); } else { cpp_errno (pfile, CPP_DL_WARNING, "could not determine date and time"); pfile->date = UC"\"??? ?? ????\""; pfile->time = UC"\"??:??:??\""; } } if (node->value.builtin == BT_DATE) result = pfile->date; else result = pfile->time; break; case BT_COUNTER: if (CPP_OPTION (pfile, directives_only) && pfile->state.in_directive) cpp_error (pfile, CPP_DL_ERROR, "__COUNTER__ expanded inside directive with -fdirectives-only"); number = pfile->counter++; break; } if (result == NULL) { /* 21 bytes holds all NUL-terminated unsigned 64-bit numbers. */ result = _cpp_unaligned_alloc (pfile, 21); sprintf ((char *) result, "%u", number); } return result; } /* Convert builtin macros like __FILE__ to a token and push it on the context stack. Also handles _Pragma, for which a new token may not be created. Returns 1 if it generates a new token context, 0 to return the token to the caller. */ static int builtin_macro (cpp_reader *pfile, cpp_hashnode *node) { const uchar *buf; size_t len; char *nbuf; if (node->value.builtin == BT_PRAGMA) { /* Don't interpret _Pragma within directives. The standard is not clear on this, but to me this makes most sense. */ if (pfile->state.in_directive) return 0; return _cpp_do__Pragma (pfile); } buf = _cpp_builtin_macro_text (pfile, node); len = ustrlen (buf); nbuf = (char *) alloca (len + 1); memcpy (nbuf, buf, len); nbuf[len]='\n'; cpp_push_buffer (pfile, (uchar *) nbuf, len, /* from_stage3 */ true); _cpp_clean_line (pfile); /* Set pfile->cur_token as required by _cpp_lex_direct. */ pfile->cur_token = _cpp_temp_token (pfile); _cpp_push_token_context (pfile, NULL, _cpp_lex_direct (pfile), 1); if (pfile->buffer->cur != pfile->buffer->rlimit) cpp_error (pfile, CPP_DL_ICE, "invalid built-in macro \"%s\"", NODE_NAME (node)); _cpp_pop_buffer (pfile); return 1; } /* Copies SRC, of length LEN, to DEST, adding backslashes before all backslashes and double quotes. DEST must be of sufficient size. Returns a pointer to the end of the string. */ uchar * cpp_quote_string (uchar *dest, const uchar *src, unsigned int len) { while (len--) { uchar c = *src++; if (c == '\\' || c == '"') { *dest++ = '\\'; *dest++ = c; } else *dest++ = c; } return dest; } /* Convert a token sequence ARG to a single string token according to the rules of the ISO C #-operator. */ static const cpp_token * stringify_arg (cpp_reader *pfile, macro_arg *arg) { unsigned char *dest; unsigned int i, escape_it, backslash_count = 0; const cpp_token *source = NULL; size_t len; if (BUFF_ROOM (pfile->u_buff) < 3) _cpp_extend_buff (pfile, &pfile->u_buff, 3); dest = BUFF_FRONT (pfile->u_buff); *dest++ = '"'; /* Loop, reading in the argument's tokens. */ for (i = 0; i < arg->count; i++) { const cpp_token *token = arg->first[i]; if (token->type == CPP_PADDING) { if (source == NULL || (!(source->flags & PREV_WHITE) && token->val.source == NULL)) source = token->val.source; continue; } escape_it = (token->type == CPP_STRING || token->type == CPP_CHAR || token->type == CPP_WSTRING || token->type == CPP_WCHAR || token->type == CPP_STRING32 || token->type == CPP_CHAR32 || token->type == CPP_STRING16 || token->type == CPP_CHAR16 || token->type == CPP_UTF8STRING); /* Room for each char being written in octal, initial space and final quote and NUL. */ len = cpp_token_len (token); if (escape_it) len *= 4; len += 3; if ((size_t) (BUFF_LIMIT (pfile->u_buff) - dest) < len) { size_t len_so_far = dest - BUFF_FRONT (pfile->u_buff); _cpp_extend_buff (pfile, &pfile->u_buff, len); dest = BUFF_FRONT (pfile->u_buff) + len_so_far; } /* Leading white space? */ if (dest - 1 != BUFF_FRONT (pfile->u_buff)) { if (source == NULL) source = token; if (source->flags & PREV_WHITE) *dest++ = ' '; } source = NULL; if (escape_it) { _cpp_buff *buff = _cpp_get_buff (pfile, len); unsigned char *buf = BUFF_FRONT (buff); len = cpp_spell_token (pfile, token, buf, true) - buf; dest = cpp_quote_string (dest, buf, len); _cpp_release_buff (pfile, buff); } else dest = cpp_spell_token (pfile, token, dest, true); if (token->type == CPP_OTHER && token->val.str.text[0] == '\\') backslash_count++; else backslash_count = 0; } /* Ignore the final \ of invalid string literals. */ if (backslash_count & 1) { cpp_error (pfile, CPP_DL_WARNING, "invalid string literal, ignoring final '\\'"); dest--; } /* Commit the memory, including NUL, and return the token. */ *dest++ = '"'; len = dest - BUFF_FRONT (pfile->u_buff); BUFF_FRONT (pfile->u_buff) = dest + 1; return new_string_token (pfile, dest - len, len); } /* Try to paste two tokens. On success, return nonzero. In any case, PLHS is updated to point to the pasted token, which is guaranteed to not have the PASTE_LEFT flag set. */ static bool paste_tokens (cpp_reader *pfile, const cpp_token **plhs, const cpp_token *rhs) { unsigned char *buf, *end, *lhsend; cpp_token *lhs; unsigned int len; len = cpp_token_len (*plhs) + cpp_token_len (rhs) + 1; buf = (unsigned char *) alloca (len); end = lhsend = cpp_spell_token (pfile, *plhs, buf, false); /* Avoid comment headers, since they are still processed in stage 3. It is simpler to insert a space here, rather than modifying the lexer to ignore comments in some circumstances. Simply returning false doesn't work, since we want to clear the PASTE_LEFT flag. */ if ((*plhs)->type == CPP_DIV && rhs->type != CPP_EQ) *end++ = ' '; /* In one obscure case we might see padding here. */ if (rhs->type != CPP_PADDING) end = cpp_spell_token (pfile, rhs, end, false); *end = '\n'; cpp_push_buffer (pfile, buf, end - buf, /* from_stage3 */ true); _cpp_clean_line (pfile); /* Set pfile->cur_token as required by _cpp_lex_direct. */ pfile->cur_token = _cpp_temp_token (pfile); lhs = _cpp_lex_direct (pfile); if (pfile->buffer->cur != pfile->buffer->rlimit) { source_location saved_loc = lhs->src_loc; _cpp_pop_buffer (pfile); _cpp_backup_tokens (pfile, 1); *lhsend = '\0'; /* We have to remove the PASTE_LEFT flag from the old lhs, but we want to keep the new location. */ *lhs = **plhs; *plhs = lhs; lhs->src_loc = saved_loc; lhs->flags &= ~PASTE_LEFT; /* Mandatory error for all apart from assembler. */ if (CPP_OPTION (pfile, lang) != CLK_ASM) cpp_error (pfile, CPP_DL_ERROR, "pasting \"%s\" and \"%s\" does not give a valid preprocessing token", buf, cpp_token_as_text (pfile, rhs)); return false; } *plhs = lhs; _cpp_pop_buffer (pfile); return true; } /* Handles an arbitrarily long sequence of ## operators, with initial operand LHS. This implementation is left-associative, non-recursive, and finishes a paste before handling succeeding ones. If a paste fails, we back up to the RHS of the failing ## operator before pushing the context containing the result of prior successful pastes, with the effect that the RHS appears in the output stream after the pasted LHS normally. */ static void paste_all_tokens (cpp_reader *pfile, const cpp_token *lhs) { const cpp_token *rhs; cpp_context *context = pfile->context; do { /* Take the token directly from the current context. We can do this, because we are in the replacement list of either an object-like macro, or a function-like macro with arguments inserted. In either case, the constraints to #define guarantee we have at least one more token. */ if (context->direct_p) rhs = FIRST (context).token++; else rhs = *FIRST (context).ptoken++; if (rhs->type == CPP_PADDING) { if (rhs->flags & PASTE_LEFT) abort (); } if (!paste_tokens (pfile, &lhs, rhs)) break; } while (rhs->flags & PASTE_LEFT); /* Put the resulting token in its own context. */ _cpp_push_token_context (pfile, NULL, lhs, 1); } /* Returns TRUE if the number of arguments ARGC supplied in an invocation of the MACRO referenced by NODE is valid. An empty invocation to a macro with no parameters should pass ARGC as zero. Note that MACRO cannot necessarily be deduced from NODE, in case NODE was redefined whilst collecting arguments. */ bool _cpp_arguments_ok (cpp_reader *pfile, cpp_macro *macro, const cpp_hashnode *node, unsigned int argc) { if (argc == macro->paramc) return true; if (argc < macro->paramc) { /* As an extension, a rest argument is allowed to not appear in the invocation at all. e.g. #define debug(format, args...) something debug("string"); This is exactly the same as if there had been an empty rest argument - debug("string", ). */ if (argc + 1 == macro->paramc && macro->variadic) { if (CPP_PEDANTIC (pfile) && ! macro->syshdr) cpp_error (pfile, CPP_DL_PEDWARN, "ISO C99 requires rest arguments to be used"); return true; } cpp_error (pfile, CPP_DL_ERROR, "macro \"%s\" requires %u arguments, but only %u given", NODE_NAME (node), macro->paramc, argc); } else cpp_error (pfile, CPP_DL_ERROR, "macro \"%s\" passed %u arguments, but takes just %u", NODE_NAME (node), argc, macro->paramc); return false; } /* Reads and returns the arguments to a function-like macro invocation. Assumes the opening parenthesis has been processed. If there is an error, emits an appropriate diagnostic and returns NULL. Each argument is terminated by a CPP_EOF token, for the future benefit of expand_arg(). If there are any deferred #pragma directives among macro arguments, store pointers to the CPP_PRAGMA ... CPP_PRAGMA_EOL tokens into *PRAGMA_BUFF buffer. */ static _cpp_buff * collect_args (cpp_reader *pfile, const cpp_hashnode *node, _cpp_buff **pragma_buff) { _cpp_buff *buff, *base_buff; cpp_macro *macro; macro_arg *args, *arg; const cpp_token *token; unsigned int argc; macro = node->value.macro; if (macro->paramc) argc = macro->paramc; else argc = 1; buff = _cpp_get_buff (pfile, argc * (50 * sizeof (cpp_token *) + sizeof (macro_arg))); base_buff = buff; args = (macro_arg *) buff->base; memset (args, 0, argc * sizeof (macro_arg)); buff->cur = (unsigned char *) &args[argc]; arg = args, argc = 0; /* Collect the tokens making up each argument. We don't yet know how many arguments have been supplied, whether too many or too few. Hence the slightly bizarre usage of "argc" and "arg". */ do { unsigned int paren_depth = 0; unsigned int ntokens = 0; argc++; arg->first = (const cpp_token **) buff->cur; for (;;) { /* Require space for 2 new tokens (including a CPP_EOF). */ if ((unsigned char *) &arg->first[ntokens + 2] > buff->limit) { buff = _cpp_append_extend_buff (pfile, buff, 1000 * sizeof (cpp_token *)); arg->first = (const cpp_token **) buff->cur; } token = cpp_get_token (pfile); if (token->type == CPP_PADDING) { /* Drop leading padding. */ if (ntokens == 0) continue; } else if (token->type == CPP_OPEN_PAREN) paren_depth++; else if (token->type == CPP_CLOSE_PAREN) { if (paren_depth-- == 0) break; } else if (token->type == CPP_COMMA) { /* A comma does not terminate an argument within parentheses or as part of a variable argument. */ if (paren_depth == 0 && ! (macro->variadic && argc == macro->paramc)) break; } else if (token->type == CPP_EOF || (token->type == CPP_HASH && token->flags & BOL)) break; else if (token->type == CPP_PRAGMA) { cpp_token *newtok = _cpp_temp_token (pfile); /* CPP_PRAGMA token lives in directive_result, which will be overwritten on the next directive. */ *newtok = *token; token = newtok; do { if (*pragma_buff == NULL || BUFF_ROOM (*pragma_buff) < sizeof (cpp_token *)) { _cpp_buff *next; if (*pragma_buff == NULL) *pragma_buff = _cpp_get_buff (pfile, 32 * sizeof (cpp_token *)); else { next = *pragma_buff; *pragma_buff = _cpp_get_buff (pfile, (BUFF_FRONT (*pragma_buff) - (*pragma_buff)->base) * 2); (*pragma_buff)->next = next; } } *(const cpp_token **) BUFF_FRONT (*pragma_buff) = token; BUFF_FRONT (*pragma_buff) += sizeof (cpp_token *); if (token->type == CPP_PRAGMA_EOL) break; token = cpp_get_token (pfile); } while (token->type != CPP_EOF); /* In deferred pragmas parsing_args and prevent_expansion had been changed, reset it. */ pfile->state.parsing_args = 2; pfile->state.prevent_expansion = 1; if (token->type == CPP_EOF) break; else continue; } arg->first[ntokens++] = token; } /* Drop trailing padding. */ while (ntokens > 0 && arg->first[ntokens - 1]->type == CPP_PADDING) ntokens--; arg->count = ntokens; arg->first[ntokens] = &pfile->eof; /* Terminate the argument. Excess arguments loop back and overwrite the final legitimate argument, before failing. */ if (argc <= macro->paramc) { buff->cur = (unsigned char *) &arg->first[ntokens + 1]; if (argc != macro->paramc) arg++; } } while (token->type != CPP_CLOSE_PAREN && token->type != CPP_EOF); if (token->type == CPP_EOF) { /* We still need the CPP_EOF to end directives, and to end pre-expansion of a macro argument. Step back is not unconditional, since we don't want to return a CPP_EOF to our callers at the end of an -include-d file. */ if (pfile->context->prev || pfile->state.in_directive) _cpp_backup_tokens (pfile, 1); cpp_error (pfile, CPP_DL_ERROR, "unterminated argument list invoking macro \"%s\"", NODE_NAME (node)); } else { /* A single empty argument is counted as no argument. */ if (argc == 1 && macro->paramc == 0 && args[0].count == 0) argc = 0; if (_cpp_arguments_ok (pfile, macro, node, argc)) { /* GCC has special semantics for , ## b where b is a varargs parameter: we remove the comma if b was omitted entirely. If b was merely an empty argument, the comma is retained. If the macro takes just one (varargs) parameter, then we retain the comma only if we are standards conforming. If FIRST is NULL replace_args () swallows the comma. */ if (macro->variadic && (argc < macro->paramc || (argc == 1 && args[0].count == 0 && !CPP_OPTION (pfile, std)))) args[macro->paramc - 1].first = NULL; return base_buff; } } /* An error occurred. */ _cpp_release_buff (pfile, base_buff); return NULL; } /* Search for an opening parenthesis to the macro of NODE, in such a way that, if none is found, we don't lose the information in any intervening padding tokens. If we find the parenthesis, collect the arguments and return the buffer containing them. PRAGMA_BUFF argument is the same as in collect_args. */ static _cpp_buff * funlike_invocation_p (cpp_reader *pfile, cpp_hashnode *node, _cpp_buff **pragma_buff) { const cpp_token *token, *padding = NULL; for (;;) { token = cpp_get_token (pfile); if (token->type != CPP_PADDING) break; if (padding == NULL || (!(padding->flags & PREV_WHITE) && token->val.source == NULL)) padding = token; } if (token->type == CPP_OPEN_PAREN) { pfile->state.parsing_args = 2; return collect_args (pfile, node, pragma_buff); } /* CPP_EOF can be the end of macro arguments, or the end of the file. We mustn't back up over the latter. Ugh. */ if (token->type != CPP_EOF || token == &pfile->eof) { /* Back up. We may have skipped padding, in which case backing up more than one token when expanding macros is in general too difficult. We re-insert it in its own context. */ _cpp_backup_tokens (pfile, 1); if (padding) _cpp_push_token_context (pfile, NULL, padding, 1); } return NULL; } /* Return the real number of tokens in the expansion of MACRO. */ static inline unsigned int macro_real_token_count (const cpp_macro *macro) { unsigned int i; if (__builtin_expect (!macro->extra_tokens, true)) return macro->count; for (i = 0; i < macro->count; i++) if (macro->exp.tokens[i].type == CPP_PASTE) return i; abort (); } /* Push the context of a macro with hash entry NODE onto the context stack. If we can successfully expand the macro, we push a context containing its yet-to-be-rescanned replacement list and return one. If there were additionally any unexpanded deferred #pragma directives among macro arguments, push another context containing the pragma tokens before the yet-to-be-rescanned replacement list and return two. Otherwise, we don't push a context and return zero. */ static int enter_macro_context (cpp_reader *pfile, cpp_hashnode *node, const cpp_token *result) { /* The presence of a macro invalidates a file's controlling macro. */ pfile->mi_valid = false; pfile->state.angled_headers = false; if ((node->flags & NODE_BUILTIN) && !(node->flags & NODE_USED)) { node->flags |= NODE_USED; if (pfile->cb.used_define) pfile->cb.used_define (pfile, pfile->directive_line, node); } /* Handle standard macros. */ if (! (node->flags & NODE_BUILTIN)) { cpp_macro *macro = node->value.macro; _cpp_buff *pragma_buff = NULL; if (macro->fun_like) { _cpp_buff *buff; pfile->state.prevent_expansion++; pfile->keep_tokens++; pfile->state.parsing_args = 1; buff = funlike_invocation_p (pfile, node, &pragma_buff); pfile->state.parsing_args = 0; pfile->keep_tokens--; pfile->state.prevent_expansion--; if (buff == NULL) { if (CPP_WTRADITIONAL (pfile) && ! node->value.macro->syshdr) cpp_error (pfile, CPP_DL_WARNING, "function-like macro \"%s\" must be used with arguments in traditional C", NODE_NAME (node)); if (pragma_buff) _cpp_release_buff (pfile, pragma_buff); return 0; } if (macro->paramc > 0) replace_args (pfile, node, macro, (macro_arg *) buff->base); _cpp_release_buff (pfile, buff); } /* Disable the macro within its expansion. */ node->flags |= NODE_DISABLED; if (!(node->flags & NODE_USED)) { node->flags |= NODE_USED; if (pfile->cb.used_define) pfile->cb.used_define (pfile, pfile->directive_line, node); } if (pfile->cb.used) pfile->cb.used (pfile, result->src_loc, node); macro->used = 1; if (macro->paramc == 0) _cpp_push_token_context (pfile, node, macro->exp.tokens, macro_real_token_count (macro)); if (pragma_buff) { if (!pfile->state.in_directive) _cpp_push_token_context (pfile, NULL, padding_token (pfile, result), 1); do { _cpp_buff *tail = pragma_buff->next; pragma_buff->next = NULL; push_ptoken_context (pfile, NULL, pragma_buff, (const cpp_token **) pragma_buff->base, ((const cpp_token **) BUFF_FRONT (pragma_buff) - (const cpp_token **) pragma_buff->base)); pragma_buff = tail; } while (pragma_buff != NULL); return 2; } return 1; } /* Handle built-in macros and the _Pragma operator. */ return builtin_macro (pfile, node); } /* Replace the parameters in a function-like macro of NODE with the actual ARGS, and place the result in a newly pushed token context. Expand each argument before replacing, unless it is operated upon by the # or ## operators. */ static void replace_args (cpp_reader *pfile, cpp_hashnode *node, cpp_macro *macro, macro_arg *args) { unsigned int i, total; const cpp_token *src, *limit; const cpp_token **dest, **first; macro_arg *arg; _cpp_buff *buff; unsigned int count; /* First, fully macro-expand arguments, calculating the number of tokens in the final expansion as we go. The ordering of the if statements below is subtle; we must handle stringification before pasting. */ count = macro_real_token_count (macro); total = count; limit = macro->exp.tokens + count; for (src = macro->exp.tokens; src < limit; src++) if (src->type == CPP_MACRO_ARG) { /* Leading and trailing padding tokens. */ total += 2; /* We have an argument. If it is not being stringified or pasted it is macro-replaced before insertion. */ arg = &args[src->val.macro_arg.arg_no - 1]; if (src->flags & STRINGIFY_ARG) { if (!arg->stringified) arg->stringified = stringify_arg (pfile, arg); } else if ((src->flags & PASTE_LEFT) || (src > macro->exp.tokens && (src[-1].flags & PASTE_LEFT))) total += arg->count - 1; else { if (!arg->expanded) expand_arg (pfile, arg); total += arg->expanded_count - 1; } } /* Now allocate space for the expansion, copy the tokens and replace the arguments. */ buff = _cpp_get_buff (pfile, total * sizeof (cpp_token *)); first = (const cpp_token **) buff->base; dest = first; for (src = macro->exp.tokens; src < limit; src++) { unsigned int count; const cpp_token **from, **paste_flag; if (src->type != CPP_MACRO_ARG) { *dest++ = src; continue; } paste_flag = 0; arg = &args[src->val.macro_arg.arg_no - 1]; if (src->flags & STRINGIFY_ARG) count = 1, from = &arg->stringified; else if (src->flags & PASTE_LEFT) count = arg->count, from = arg->first; else if (src != macro->exp.tokens && (src[-1].flags & PASTE_LEFT)) { count = arg->count, from = arg->first; if (dest != first) { if (dest[-1]->type == CPP_COMMA && macro->variadic && src->val.macro_arg.arg_no == macro->paramc) { /* Swallow a pasted comma if from == NULL, otherwise drop the paste flag. */ if (from == NULL) dest--; else paste_flag = dest - 1; } /* Remove the paste flag if the RHS is a placemarker. */ else if (count == 0) paste_flag = dest - 1; } } else count = arg->expanded_count, from = arg->expanded; /* Padding on the left of an argument (unless RHS of ##). */ if ((!pfile->state.in_directive || pfile->state.directive_wants_padding) && src != macro->exp.tokens && !(src[-1].flags & PASTE_LEFT)) *dest++ = padding_token (pfile, src); if (count) { memcpy (dest, from, count * sizeof (cpp_token *)); dest += count; /* With a non-empty argument on the LHS of ##, the last token should be flagged PASTE_LEFT. */ if (src->flags & PASTE_LEFT) paste_flag = dest - 1; } else if (CPP_PEDANTIC (pfile) && ! macro->syshdr && ! CPP_OPTION (pfile, c99) && ! cpp_in_system_header (pfile)) { cpp_error (pfile, CPP_DL_PEDWARN, "invoking macro %s argument %d: " "empty macro arguments are undefined" " in ISO C90 and ISO C++98", NODE_NAME (node), src->val.macro_arg.arg_no); } /* Avoid paste on RHS (even case count == 0). */ if (!pfile->state.in_directive && !(src->flags & PASTE_LEFT)) *dest++ = &pfile->avoid_paste; /* Add a new paste flag, or remove an unwanted one. */ if (paste_flag) { cpp_token *token = _cpp_temp_token (pfile); token->type = (*paste_flag)->type; token->val = (*paste_flag)->val; if (src->flags & PASTE_LEFT) token->flags = (*paste_flag)->flags | PASTE_LEFT; else token->flags = (*paste_flag)->flags & ~PASTE_LEFT; *paste_flag = token; } } /* Free the expanded arguments. */ for (i = 0; i < macro->paramc; i++) if (args[i].expanded) free (args[i].expanded); push_ptoken_context (pfile, node, buff, first, dest - first); } /* Return a special padding token, with padding inherited from SOURCE. */ static const cpp_token * padding_token (cpp_reader *pfile, const cpp_token *source) { cpp_token *result = _cpp_temp_token (pfile); result->type = CPP_PADDING; /* Data in GCed data structures cannot be made const so far, so we need a cast here. */ result->val.source = (cpp_token *) source; result->flags = 0; return result; } /* Get a new uninitialized context. Create a new one if we cannot re-use an old one. */ static cpp_context * next_context (cpp_reader *pfile) { cpp_context *result = pfile->context->next; if (result == 0) { result = XNEW (cpp_context); result->prev = pfile->context; result->next = 0; pfile->context->next = result; } pfile->context = result; return result; } /* Push a list of pointers to tokens. */ static void push_ptoken_context (cpp_reader *pfile, cpp_hashnode *macro, _cpp_buff *buff, const cpp_token **first, unsigned int count) { cpp_context *context = next_context (pfile); context->direct_p = false; context->macro = macro; context->buff = buff; FIRST (context).ptoken = first; LAST (context).ptoken = first + count; } /* Push a list of tokens. */ void _cpp_push_token_context (cpp_reader *pfile, cpp_hashnode *macro, const cpp_token *first, unsigned int count) { cpp_context *context = next_context (pfile); context->direct_p = true; context->macro = macro; context->buff = NULL; FIRST (context).token = first; LAST (context).token = first + count; } /* Push a traditional macro's replacement text. */ void _cpp_push_text_context (cpp_reader *pfile, cpp_hashnode *macro, const uchar *start, size_t len) { cpp_context *context = next_context (pfile); context->direct_p = true; context->macro = macro; context->buff = NULL; CUR (context) = start; RLIMIT (context) = start + len; macro->flags |= NODE_DISABLED; } /* Expand an argument ARG before replacing parameters in a function-like macro. This works by pushing a context with the argument's tokens, and then expanding that into a temporary buffer as if it were a normal part of the token stream. collect_args() has terminated the argument's tokens with a CPP_EOF so that we know when we have fully expanded the argument. */ static void expand_arg (cpp_reader *pfile, macro_arg *arg) { unsigned int capacity; bool saved_warn_trad; if (arg->count == 0) return; /* Don't warn about funlike macros when pre-expanding. */ saved_warn_trad = CPP_WTRADITIONAL (pfile); CPP_WTRADITIONAL (pfile) = 0; /* Loop, reading in the arguments. */ capacity = 256; arg->expanded = XNEWVEC (const cpp_token *, capacity); push_ptoken_context (pfile, NULL, NULL, arg->first, arg->count + 1); for (;;) { const cpp_token *token; if (arg->expanded_count + 1 >= capacity) { capacity *= 2; arg->expanded = XRESIZEVEC (const cpp_token *, arg->expanded, capacity); } token = cpp_get_token (pfile); if (token->type == CPP_EOF) break; arg->expanded[arg->expanded_count++] = token; } _cpp_pop_context (pfile); CPP_WTRADITIONAL (pfile) = saved_warn_trad; } /* Pop the current context off the stack, re-enabling the macro if the context represented a macro's replacement list. The context structure is not freed so that we can re-use it later. */ void _cpp_pop_context (cpp_reader *pfile) { cpp_context *context = pfile->context; if (context->macro) context->macro->flags &= ~NODE_DISABLED; if (context->buff) _cpp_release_buff (pfile, context->buff); pfile->context = context->prev; } /* External routine to get a token. Also used nearly everywhere internally, except for places where we know we can safely call _cpp_lex_token directly, such as lexing a directive name. Macro expansions and directives are transparently handled, including entering included files. Thus tokens are post-macro expansion, and after any intervening directives. External callers see CPP_EOF only at EOF. Internal callers also see it when meeting a directive inside a macro call, when at the end of a directive and state.in_directive is still 1, and at the end of argument pre-expansion. */ const cpp_token * cpp_get_token (cpp_reader *pfile) { const cpp_token *result; bool can_set = pfile->set_invocation_location; pfile->set_invocation_location = false; for (;;) { cpp_hashnode *node; cpp_context *context = pfile->context; /* Context->prev == 0 <=> base context. */ if (!context->prev) result = _cpp_lex_token (pfile); else if (FIRST (context).token != LAST (context).token) { if (context->direct_p) result = FIRST (context).token++; else result = *FIRST (context).ptoken++; if (result->flags & PASTE_LEFT) { paste_all_tokens (pfile, result); if (pfile->state.in_directive) continue; return padding_token (pfile, result); } } else { _cpp_pop_context (pfile); if (pfile->state.in_directive) continue; return &pfile->avoid_paste; } if (pfile->state.in_directive && result->type == CPP_COMMENT) continue; if (result->type != CPP_NAME) break; node = result->val.node.node; if (node->type != NT_MACRO || (result->flags & NO_EXPAND)) break; if (!(node->flags & NODE_DISABLED)) { int ret = 0; /* If not in a macro context, and we're going to start an expansion, record the location. */ if (can_set && !context->macro) pfile->invocation_location = result->src_loc; if (pfile->state.prevent_expansion) break; /* Conditional macros require that a predicate be evaluated first. */ if ((node->flags & NODE_CONDITIONAL) != 0) { if (pfile->cb.macro_to_expand) { bool whitespace_after; const cpp_token *peek_tok = cpp_peek_token (pfile, 0); whitespace_after = (peek_tok->type == CPP_PADDING || (peek_tok->flags & PREV_WHITE)); node = pfile->cb.macro_to_expand (pfile, result); if (node) ret = enter_macro_context (pfile, node, result); else if (whitespace_after) { /* If macro_to_expand hook returned NULL and it ate some tokens, see if we don't need to add a padding token in between this and the next token. */ peek_tok = cpp_peek_token (pfile, 0); if (peek_tok->type != CPP_PADDING && (peek_tok->flags & PREV_WHITE) == 0) _cpp_push_token_context (pfile, NULL, padding_token (pfile, peek_tok), 1); } } } else ret = enter_macro_context (pfile, node, result); if (ret) { if (pfile->state.in_directive || ret == 2) continue; return padding_token (pfile, result); } } else { /* Flag this token as always unexpandable. FIXME: move this to collect_args()?. */ cpp_token *t = _cpp_temp_token (pfile); t->type = result->type; t->flags = result->flags | NO_EXPAND; t->val = result->val; result = t; } break; } return result; } /* Like cpp_get_token, but also returns a location separate from the one provided by the returned token. LOC is an out parameter; *LOC is set to the location "as expected by the user". This matters when a token results from macro expansion -- the token's location will indicate where the macro is defined, but *LOC will be the location of the start of the expansion. */ const cpp_token * cpp_get_token_with_location (cpp_reader *pfile, source_location *loc) { const cpp_token *result; pfile->set_invocation_location = true; result = cpp_get_token (pfile); if (pfile->context->macro) *loc = pfile->invocation_location; else *loc = result->src_loc; return result; } /* Returns true if we're expanding an object-like macro that was defined in a system header. Just checks the macro at the top of the stack. Used for diagnostic suppression. */ int cpp_sys_macro_p (cpp_reader *pfile) { cpp_hashnode *node = pfile->context->macro; return node && node->value.macro && node->value.macro->syshdr; } /* Read each token in, until end of the current file. Directives are transparently processed. */ void cpp_scan_nooutput (cpp_reader *pfile) { /* Request a CPP_EOF token at the end of this file, rather than transparently continuing with the including file. */ pfile->buffer->return_at_eof = true; pfile->state.discarding_output++; pfile->state.prevent_expansion++; if (CPP_OPTION (pfile, traditional)) while (_cpp_read_logical_line_trad (pfile)) ; else while (cpp_get_token (pfile)->type != CPP_EOF) ; pfile->state.discarding_output--; pfile->state.prevent_expansion--; } /* Step back one or more tokens obtained from the lexer. */ void _cpp_backup_tokens_direct (cpp_reader *pfile, unsigned int count) { pfile->lookaheads += count; while (count--) { pfile->cur_token--; if (pfile->cur_token == pfile->cur_run->base /* Possible with -fpreprocessed and no leading #line. */ && pfile->cur_run->prev != NULL) { pfile->cur_run = pfile->cur_run->prev; pfile->cur_token = pfile->cur_run->limit; } } } /* Step back one (or more) tokens. Can only step back more than 1 if they are from the lexer, and not from macro expansion. */ void _cpp_backup_tokens (cpp_reader *pfile, unsigned int count) { if (pfile->context->prev == NULL) _cpp_backup_tokens_direct (pfile, count); else { if (count != 1) abort (); if (pfile->context->direct_p) FIRST (pfile->context).token--; else FIRST (pfile->context).ptoken--; } } /* #define directive parsing and handling. */ /* Returns nonzero if a macro redefinition warning is required. */ static bool warn_of_redefinition (cpp_reader *pfile, const cpp_hashnode *node, const cpp_macro *macro2) { const cpp_macro *macro1; unsigned int i; /* Some redefinitions need to be warned about regardless. */ if (node->flags & NODE_WARN) return true; /* Suppress warnings for builtins that lack the NODE_WARN flag. */ if (node->flags & NODE_BUILTIN) return false; /* Redefinitions of conditional (context-sensitive) macros, on the other hand, must be allowed silently. */ if (node->flags & NODE_CONDITIONAL) return false; /* Redefinition of a macro is allowed if and only if the old and new definitions are the same. (6.10.3 paragraph 2). */ macro1 = node->value.macro; /* Don't check count here as it can be different in valid traditional redefinitions with just whitespace differences. */ if (macro1->paramc != macro2->paramc || macro1->fun_like != macro2->fun_like || macro1->variadic != macro2->variadic) return true; /* Check parameter spellings. */ for (i = 0; i < macro1->paramc; i++) if (macro1->params[i] != macro2->params[i]) return true; /* Check the replacement text or tokens. */ if (CPP_OPTION (pfile, traditional)) return _cpp_expansions_different_trad (macro1, macro2); if (macro1->count != macro2->count) return true; for (i = 0; i < macro1->count; i++) if (!_cpp_equiv_tokens (¯o1->exp.tokens[i], ¯o2->exp.tokens[i])) return true; return false; } /* Free the definition of hashnode H. */ void _cpp_free_definition (cpp_hashnode *h) { /* Macros and assertions no longer have anything to free. */ h->type = NT_VOID; /* Clear builtin flag in case of redefinition. */ h->flags &= ~(NODE_BUILTIN | NODE_DISABLED | NODE_USED); } /* Save parameter NODE to the parameter list of macro MACRO. Returns zero on success, nonzero if the parameter is a duplicate. */ bool _cpp_save_parameter (cpp_reader *pfile, cpp_macro *macro, cpp_hashnode *node) { unsigned int len; /* Constraint 6.10.3.6 - duplicate parameter names. */ if (node->flags & NODE_MACRO_ARG) { cpp_error (pfile, CPP_DL_ERROR, "duplicate macro parameter \"%s\"", NODE_NAME (node)); return true; } if (BUFF_ROOM (pfile->a_buff) < (macro->paramc + 1) * sizeof (cpp_hashnode *)) _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (cpp_hashnode *)); ((cpp_hashnode **) BUFF_FRONT (pfile->a_buff))[macro->paramc++] = node; node->flags |= NODE_MACRO_ARG; len = macro->paramc * sizeof (union _cpp_hashnode_value); if (len > pfile->macro_buffer_len) { pfile->macro_buffer = XRESIZEVEC (unsigned char, pfile->macro_buffer, len); pfile->macro_buffer_len = len; } ((union _cpp_hashnode_value *) pfile->macro_buffer)[macro->paramc - 1] = node->value; node->value.arg_index = macro->paramc; return false; } /* Check the syntax of the parameters in a MACRO definition. Returns false if an error occurs. */ static bool parse_params (cpp_reader *pfile, cpp_macro *macro) { unsigned int prev_ident = 0; for (;;) { const cpp_token *token = _cpp_lex_token (pfile); switch (token->type) { default: /* Allow/ignore comments in parameter lists if we are preserving comments in macro expansions. */ if (token->type == CPP_COMMENT && ! CPP_OPTION (pfile, discard_comments_in_macro_exp)) continue; cpp_error (pfile, CPP_DL_ERROR, "\"%s\" may not appear in macro parameter list", cpp_token_as_text (pfile, token)); return false; case CPP_NAME: if (prev_ident) { cpp_error (pfile, CPP_DL_ERROR, "macro parameters must be comma-separated"); return false; } prev_ident = 1; if (_cpp_save_parameter (pfile, macro, token->val.node.node)) return false; continue; case CPP_CLOSE_PAREN: if (prev_ident || macro->paramc == 0) return true; /* Fall through to pick up the error. */ case CPP_COMMA: if (!prev_ident) { cpp_error (pfile, CPP_DL_ERROR, "parameter name missing"); return false; } prev_ident = 0; continue; case CPP_ELLIPSIS: macro->variadic = 1; if (!prev_ident) { _cpp_save_parameter (pfile, macro, pfile->spec_nodes.n__VA_ARGS__); pfile->state.va_args_ok = 1; if (! CPP_OPTION (pfile, c99) && CPP_OPTION (pfile, pedantic) && CPP_OPTION (pfile, warn_variadic_macros)) cpp_error (pfile, CPP_DL_PEDWARN, "anonymous variadic macros were introduced in C99"); } else if (CPP_OPTION (pfile, pedantic) && CPP_OPTION (pfile, warn_variadic_macros)) cpp_error (pfile, CPP_DL_PEDWARN, "ISO C does not permit named variadic macros"); /* We're at the end, and just expect a closing parenthesis. */ token = _cpp_lex_token (pfile); if (token->type == CPP_CLOSE_PAREN) return true; /* Fall through. */ case CPP_EOF: cpp_error (pfile, CPP_DL_ERROR, "missing ')' in macro parameter list"); return false; } } } /* Allocate room for a token from a macro's replacement list. */ static cpp_token * alloc_expansion_token (cpp_reader *pfile, cpp_macro *macro) { if (BUFF_ROOM (pfile->a_buff) < (macro->count + 1) * sizeof (cpp_token)) _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (cpp_token)); return &((cpp_token *) BUFF_FRONT (pfile->a_buff))[macro->count++]; } /* Lex a token from the expansion of MACRO, but mark parameters as we find them and warn of traditional stringification. */ static cpp_token * lex_expansion_token (cpp_reader *pfile, cpp_macro *macro) { cpp_token *token, *saved_cur_token; saved_cur_token = pfile->cur_token; pfile->cur_token = alloc_expansion_token (pfile, macro); token = _cpp_lex_direct (pfile); pfile->cur_token = saved_cur_token; /* Is this a parameter? */ if (token->type == CPP_NAME && (token->val.node.node->flags & NODE_MACRO_ARG) != 0) { token->type = CPP_MACRO_ARG; token->val.macro_arg.arg_no = token->val.node.node->value.arg_index; } else if (CPP_WTRADITIONAL (pfile) && macro->paramc > 0 && (token->type == CPP_STRING || token->type == CPP_CHAR)) check_trad_stringification (pfile, macro, &token->val.str); return token; } static bool create_iso_definition (cpp_reader *pfile, cpp_macro *macro) { cpp_token *token; const cpp_token *ctoken; bool following_paste_op = false; const char *paste_op_error_msg = N_("'##' cannot appear at either end of a macro expansion"); unsigned int num_extra_tokens = 0; /* Get the first token of the expansion (or the '(' of a function-like macro). */ ctoken = _cpp_lex_token (pfile); if (ctoken->type == CPP_OPEN_PAREN && !(ctoken->flags & PREV_WHITE)) { bool ok = parse_params (pfile, macro); macro->params = (cpp_hashnode **) BUFF_FRONT (pfile->a_buff); if (!ok) return false; /* Success. Commit or allocate the parameter array. */ if (pfile->hash_table->alloc_subobject) { cpp_hashnode **params = (cpp_hashnode **) pfile->hash_table->alloc_subobject (sizeof (cpp_hashnode *) * macro->paramc); memcpy (params, macro->params, sizeof (cpp_hashnode *) * macro->paramc); macro->params = params; } else BUFF_FRONT (pfile->a_buff) = (uchar *) ¯o->params[macro->paramc]; macro->fun_like = 1; } else if (ctoken->type != CPP_EOF && !(ctoken->flags & PREV_WHITE)) { /* While ISO C99 requires whitespace before replacement text in a macro definition, ISO C90 with TC1 allows there characters from the basic source character set. */ if (CPP_OPTION (pfile, c99)) cpp_error (pfile, CPP_DL_PEDWARN, "ISO C99 requires whitespace after the macro name"); else { int warntype = CPP_DL_WARNING; switch (ctoken->type) { case CPP_ATSIGN: case CPP_AT_NAME: case CPP_OBJC_STRING: /* '@' is not in basic character set. */ warntype = CPP_DL_PEDWARN; break; case CPP_OTHER: /* Basic character set sans letters, digits and _. */ if (strchr ("!\"#%&'()*+,-./:;<=>?[\\]^{|}~", ctoken->val.str.text[0]) == NULL) warntype = CPP_DL_PEDWARN; break; default: /* All other tokens start with a character from basic character set. */ break; } cpp_error (pfile, warntype, "missing whitespace after the macro name"); } } if (macro->fun_like) token = lex_expansion_token (pfile, macro); else { token = alloc_expansion_token (pfile, macro); *token = *ctoken; } for (;;) { /* Check the stringifying # constraint 6.10.3.2.1 of function-like macros when lexing the subsequent token. */ if (macro->count > 1 && token[-1].type == CPP_HASH && macro->fun_like) { if (token->type == CPP_MACRO_ARG) { if (token->flags & PREV_WHITE) token->flags |= SP_PREV_WHITE; if (token[-1].flags & DIGRAPH) token->flags |= SP_DIGRAPH; token->flags &= ~PREV_WHITE; token->flags |= STRINGIFY_ARG; token->flags |= token[-1].flags & PREV_WHITE; token[-1] = token[0]; macro->count--; } /* Let assembler get away with murder. */ else if (CPP_OPTION (pfile, lang) != CLK_ASM) { cpp_error (pfile, CPP_DL_ERROR, "'#' is not followed by a macro parameter"); return false; } } if (token->type == CPP_EOF) { /* Paste operator constraint 6.10.3.3.1: Token-paste ##, can appear in both object-like and function-like macros, but not at the end. */ if (following_paste_op) { cpp_error (pfile, CPP_DL_ERROR, paste_op_error_msg); return false; } break; } /* Paste operator constraint 6.10.3.3.1. */ if (token->type == CPP_PASTE) { /* Token-paste ##, can appear in both object-like and function-like macros, but not at the beginning. */ if (macro->count == 1) { cpp_error (pfile, CPP_DL_ERROR, paste_op_error_msg); return false; } if (token[-1].flags & PASTE_LEFT) { macro->extra_tokens = 1; num_extra_tokens++; token->val.token_no = macro->count - 1; } else { --macro->count; token[-1].flags |= PASTE_LEFT; if (token->flags & DIGRAPH) token[-1].flags |= SP_DIGRAPH; if (token->flags & PREV_WHITE) token[-1].flags |= SP_PREV_WHITE; } } following_paste_op = (token->type == CPP_PASTE); token = lex_expansion_token (pfile, macro); } macro->exp.tokens = (cpp_token *) BUFF_FRONT (pfile->a_buff); macro->traditional = 0; /* Don't count the CPP_EOF. */ macro->count--; /* Clear whitespace on first token for warn_of_redefinition(). */ if (macro->count) macro->exp.tokens[0].flags &= ~PREV_WHITE; /* Commit or allocate the memory. */ if (pfile->hash_table->alloc_subobject) { cpp_token *tokns = (cpp_token *) pfile->hash_table->alloc_subobject (sizeof (cpp_token) * macro->count); if (num_extra_tokens) { /* Place second and subsequent ## or %:%: tokens in sequences of consecutive such tokens at the end of the list to preserve information about where they appear, how they are spelt and whether they are preceded by whitespace without otherwise interfering with macro expansion. */ cpp_token *normal_dest = tokns; cpp_token *extra_dest = tokns + macro->count - num_extra_tokens; unsigned int i; for (i = 0; i < macro->count; i++) { if (macro->exp.tokens[i].type == CPP_PASTE) *extra_dest++ = macro->exp.tokens[i]; else *normal_dest++ = macro->exp.tokens[i]; } } else memcpy (tokns, macro->exp.tokens, sizeof (cpp_token) * macro->count); macro->exp.tokens = tokns; } else BUFF_FRONT (pfile->a_buff) = (uchar *) ¯o->exp.tokens[macro->count]; return true; } /* Parse a macro and save its expansion. Returns nonzero on success. */ bool _cpp_create_definition (cpp_reader *pfile, cpp_hashnode *node) { cpp_macro *macro; unsigned int i; bool ok; if (pfile->hash_table->alloc_subobject) macro = (cpp_macro *) pfile->hash_table->alloc_subobject (sizeof (cpp_macro)); else macro = (cpp_macro *) _cpp_aligned_alloc (pfile, sizeof (cpp_macro)); macro->line = pfile->directive_line; macro->params = 0; macro->paramc = 0; macro->variadic = 0; macro->used = !CPP_OPTION (pfile, warn_unused_macros); macro->count = 0; macro->fun_like = 0; macro->extra_tokens = 0; /* To suppress some diagnostics. */ macro->syshdr = pfile->buffer && pfile->buffer->sysp != 0; if (CPP_OPTION (pfile, traditional)) ok = _cpp_create_trad_definition (pfile, macro); else { ok = create_iso_definition (pfile, macro); /* We set the type for SEEN_EOL() in directives.c. Longer term we should lex the whole line before coming here, and just copy the expansion. */ /* Stop the lexer accepting __VA_ARGS__. */ pfile->state.va_args_ok = 0; } /* Clear the fast argument lookup indices. */ for (i = macro->paramc; i-- > 0; ) { struct cpp_hashnode *node = macro->params[i]; node->flags &= ~ NODE_MACRO_ARG; node->value = ((union _cpp_hashnode_value *) pfile->macro_buffer)[i]; } if (!ok) return ok; if (node->type == NT_MACRO) { if (CPP_OPTION (pfile, warn_unused_macros)) _cpp_warn_if_unused_macro (pfile, node, NULL); if (warn_of_redefinition (pfile, node, macro)) { bool warned; warned = cpp_error_with_line (pfile, CPP_DL_PEDWARN, pfile->directive_line, 0, "\"%s\" redefined", NODE_NAME (node)); if (warned && node->type == NT_MACRO && !(node->flags & NODE_BUILTIN)) cpp_error_with_line (pfile, CPP_DL_NOTE, node->value.macro->line, 0, "this is the location of the previous definition"); } } if (node->type != NT_VOID) _cpp_free_definition (node); /* Enter definition in hash table. */ node->type = NT_MACRO; node->value.macro = macro; if (! ustrncmp (NODE_NAME (node), DSC ("__STDC_")) && ustrcmp (NODE_NAME (node), (const uchar *) "__STDC_FORMAT_MACROS") /* __STDC_LIMIT_MACROS and __STDC_CONSTANT_MACROS are mentioned in the C standard, as something that one must use in C++. However DR#593 indicates that these aren't actually mentioned in the C++ standard. We special-case them anyway. */ && ustrcmp (NODE_NAME (node), (const uchar *) "__STDC_LIMIT_MACROS") && ustrcmp (NODE_NAME (node), (const uchar *) "__STDC_CONSTANT_MACROS")) node->flags |= NODE_WARN; /* If user defines one of the conditional macros, remove the conditional flag */ node->flags &= ~NODE_CONDITIONAL; return ok; } /* Warn if a token in STRING matches one of a function-like MACRO's parameters. */ static void check_trad_stringification (cpp_reader *pfile, const cpp_macro *macro, const cpp_string *string) { unsigned int i, len; const uchar *p, *q, *limit; /* Loop over the string. */ limit = string->text + string->len - 1; for (p = string->text + 1; p < limit; p = q) { /* Find the start of an identifier. */ while (p < limit && !is_idstart (*p)) p++; /* Find the end of the identifier. */ q = p; while (q < limit && is_idchar (*q)) q++; len = q - p; /* Loop over the function macro arguments to see if the identifier inside the string matches one of them. */ for (i = 0; i < macro->paramc; i++) { const cpp_hashnode *node = macro->params[i]; if (NODE_LEN (node) == len && !memcmp (p, NODE_NAME (node), len)) { cpp_error (pfile, CPP_DL_WARNING, "macro argument \"%s\" would be stringified in traditional C", NODE_NAME (node)); break; } } } } /* Returns the name, arguments and expansion of a macro, in a format suitable to be read back in again, and therefore also for DWARF 2 debugging info. e.g. "PASTE(X, Y) X ## Y", or "MACNAME EXPANSION". Caller is expected to generate the "#define" bit if needed. The returned text is temporary, and automatically freed later. */ const unsigned char * cpp_macro_definition (cpp_reader *pfile, const cpp_hashnode *node) { unsigned int i, len; const cpp_macro *macro = node->value.macro; unsigned char *buffer; if (node->type != NT_MACRO || (node->flags & NODE_BUILTIN)) { cpp_error (pfile, CPP_DL_ICE, "invalid hash type %d in cpp_macro_definition", node->type); return 0; } /* Calculate length. */ len = NODE_LEN (node) + 2; /* ' ' and NUL. */ if (macro->fun_like) { len += 4; /* "()" plus possible final ".." of named varargs (we have + 1 below). */ for (i = 0; i < macro->paramc; i++) len += NODE_LEN (macro->params[i]) + 1; /* "," */ } /* This should match below where we fill in the buffer. */ if (CPP_OPTION (pfile, traditional)) len += _cpp_replacement_text_len (macro); else { unsigned int count = macro_real_token_count (macro); for (i = 0; i < count; i++) { cpp_token *token = ¯o->exp.tokens[i]; if (token->type == CPP_MACRO_ARG) len += NODE_LEN (macro->params[token->val.macro_arg.arg_no - 1]); else len += cpp_token_len (token); if (token->flags & STRINGIFY_ARG) len++; /* "#" */ if (token->flags & PASTE_LEFT) len += 3; /* " ##" */ if (token->flags & PREV_WHITE) len++; /* " " */ } } if (len > pfile->macro_buffer_len) { pfile->macro_buffer = XRESIZEVEC (unsigned char, pfile->macro_buffer, len); pfile->macro_buffer_len = len; } /* Fill in the buffer. Start with the macro name. */ buffer = pfile->macro_buffer; memcpy (buffer, NODE_NAME (node), NODE_LEN (node)); buffer += NODE_LEN (node); /* Parameter names. */ if (macro->fun_like) { *buffer++ = '('; for (i = 0; i < macro->paramc; i++) { cpp_hashnode *param = macro->params[i]; if (param != pfile->spec_nodes.n__VA_ARGS__) { memcpy (buffer, NODE_NAME (param), NODE_LEN (param)); buffer += NODE_LEN (param); } if (i + 1 < macro->paramc) /* Don't emit a space after the comma here; we're trying to emit a Dwarf-friendly definition, and the Dwarf spec forbids spaces in the argument list. */ *buffer++ = ','; else if (macro->variadic) *buffer++ = '.', *buffer++ = '.', *buffer++ = '.'; } *buffer++ = ')'; } /* The Dwarf spec requires a space after the macro name, even if the definition is the empty string. */ *buffer++ = ' '; if (CPP_OPTION (pfile, traditional)) buffer = _cpp_copy_replacement_text (macro, buffer); else if (macro->count) /* Expansion tokens. */ { unsigned int count = macro_real_token_count (macro); for (i = 0; i < count; i++) { cpp_token *token = ¯o->exp.tokens[i]; if (token->flags & PREV_WHITE) *buffer++ = ' '; if (token->flags & STRINGIFY_ARG) *buffer++ = '#'; if (token->type == CPP_MACRO_ARG) { memcpy (buffer, NODE_NAME (macro->params[token->val.macro_arg.arg_no - 1]), NODE_LEN (macro->params[token->val.macro_arg.arg_no - 1])); buffer += NODE_LEN (macro->params[token->val.macro_arg.arg_no - 1]); } else buffer = cpp_spell_token (pfile, token, buffer, false); if (token->flags & PASTE_LEFT) { *buffer++ = ' '; *buffer++ = '#'; *buffer++ = '#'; /* Next has PREV_WHITE; see _cpp_create_definition. */ } } } *buffer = '\0'; return pfile->macro_buffer; }
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