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directives.cc
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/* CPP Library. (Directive handling.)
Copyright (C) 1986-2023 Free Software Foundation, Inc.
Contributed by Per Bothner, 1994-95.
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/>. */
#include "config.h"
#include "system.h"
#include "cpplib.h"
#include "internal.h"
#include "mkdeps.h"
#include "obstack.h"
/* Stack of conditionals currently in progress
(including both successful and failing conditionals). */
struct if_stack
{
struct if_stack *next;
location_t line; /* Line where condition started. */
const cpp_hashnode *mi_cmacro;/* macro name for #ifndef around entire file */
bool skip_elses; /* Can future #else / #elif be skipped? */
bool was_skipping; /* If were skipping on entry. */
int type; /* Most recent conditional for diagnostics. */
};
/* Contains a registered pragma or pragma namespace. */
typedef void (*pragma_cb) (cpp_reader *);
struct pragma_entry
{
struct pragma_entry *next;
const cpp_hashnode *pragma; /* Name and length. */
bool is_nspace;
bool is_internal;
bool is_deferred;
bool allow_expansion;
union {
pragma_cb handler;
struct pragma_entry *space;
unsigned int ident;
} u;
};
/* Values for the origin field of struct directive. KANDR directives
come from traditional (K&R) C. STDC89 directives come from the
1989 C standard. STDC2X directives come from the C2X standard. EXTENSION
directives are extensions. */
#define KANDR 0
#define STDC89 1
#define STDC2X 2
#define EXTENSION 3
/* Values for the flags field of struct directive. COND indicates a
conditional; IF_COND an opening conditional. INCL means to treat
"..." and <...> as q-char and h-char sequences respectively. IN_I
means this directive should be handled even if -fpreprocessed is in
effect (these are the directives with callback hooks).
EXPAND is set on directives that are always macro-expanded.
ELIFDEF is set on directives that are only handled for standards with the
#elifdef / #elifndef feature. */
#define COND (1 << 0)
#define IF_COND (1 << 1)
#define INCL (1 << 2)
#define IN_I (1 << 3)
#define EXPAND (1 << 4)
#define DEPRECATED (1 << 5)
#define ELIFDEF (1 << 6)
/* Defines one #-directive, including how to handle it. */
typedef void (*directive_handler) (cpp_reader *);
typedef struct directive directive;
struct directive
{
directive_handler handler; /* Function to handle directive. */
const uchar *name; /* Name of directive. */
unsigned short length; /* Length of name. */
unsigned char origin; /* Origin of directive. */
unsigned char flags; /* Flags describing this directive. */
};
/* Forward declarations. */
static void skip_rest_of_line (cpp_reader *);
static void check_eol (cpp_reader *, bool);
static void start_directive (cpp_reader *);
static void prepare_directive_trad (cpp_reader *);
static void end_directive (cpp_reader *, int);
static void directive_diagnostics (cpp_reader *, const directive *, int);
static void run_directive (cpp_reader *, int, const char *, size_t);
static char *glue_header_name (cpp_reader *);
static const char *parse_include (cpp_reader *, int *, const cpp_token ***,
location_t *);
static void push_conditional (cpp_reader *, int, int, const cpp_hashnode *);
static unsigned int read_flag (cpp_reader *, unsigned int);
static bool strtolinenum (const uchar *, size_t, linenum_type *, bool *);
static void do_diagnostic (cpp_reader *, enum cpp_diagnostic_level code,
enum cpp_warning_reason reason, int);
static cpp_hashnode *lex_macro_node (cpp_reader *, bool);
static int undefine_macros (cpp_reader *, cpp_hashnode *, void *);
static void do_include_common (cpp_reader *, enum include_type);
static struct pragma_entry *lookup_pragma_entry (struct pragma_entry *,
const cpp_hashnode *);
static int count_registered_pragmas (struct pragma_entry *);
static char ** save_registered_pragmas (struct pragma_entry *, char **);
static char ** restore_registered_pragmas (cpp_reader *, struct pragma_entry *,
char **);
static void do_pragma_once (cpp_reader *);
static void do_pragma_poison (cpp_reader *);
static void do_pragma_system_header (cpp_reader *);
static void do_pragma_dependency (cpp_reader *);
static void do_pragma_warning_or_error (cpp_reader *, bool error);
static void do_pragma_warning (cpp_reader *);
static void do_pragma_error (cpp_reader *);
static void do_linemarker (cpp_reader *);
static const cpp_token *get_token_no_padding (cpp_reader *);
static const cpp_token *get__Pragma_string (cpp_reader *);
static void destringize_and_run (cpp_reader *, const cpp_string *,
location_t);
static bool parse_answer (cpp_reader *, int, location_t, cpp_macro **);
static cpp_hashnode *parse_assertion (cpp_reader *, int, cpp_macro **);
static cpp_macro **find_answer (cpp_hashnode *, const cpp_macro *);
static void handle_assertion (cpp_reader *, const char *, int);
static void do_pragma_push_macro (cpp_reader *);
static void do_pragma_pop_macro (cpp_reader *);
static void cpp_pop_definition (cpp_reader *, struct def_pragma_macro *);
/* This is the table of directive handlers. All extensions other than
#warning, #include_next, and #import are deprecated. The name is
where the extension appears to have come from. */
#define DIRECTIVE_TABLE \
D(define, T_DEFINE = 0, KANDR, IN_I) \
D(include, T_INCLUDE, KANDR, INCL | EXPAND) \
D(endif, T_ENDIF, KANDR, COND) \
D(ifdef, T_IFDEF, KANDR, COND | IF_COND) \
D(if, T_IF, KANDR, COND | IF_COND | EXPAND) \
D(else, T_ELSE, KANDR, COND) \
D(ifndef, T_IFNDEF, KANDR, COND | IF_COND) \
D(undef, T_UNDEF, KANDR, IN_I) \
D(line, T_LINE, KANDR, EXPAND) \
D(elif, T_ELIF, STDC89, COND | EXPAND) \
D(elifdef, T_ELIFDEF, STDC2X, COND | ELIFDEF) \
D(elifndef, T_ELIFNDEF, STDC2X, COND | ELIFDEF) \
D(error, T_ERROR, STDC89, 0) \
D(pragma, T_PRAGMA, STDC89, IN_I) \
D(warning, T_WARNING, STDC2X, 0) \
D(include_next, T_INCLUDE_NEXT, EXTENSION, INCL | EXPAND) \
D(ident, T_IDENT, EXTENSION, IN_I) \
D(import, T_IMPORT, EXTENSION, INCL | EXPAND) /* ObjC */ \
D(assert, T_ASSERT, EXTENSION, DEPRECATED) /* SVR4 */ \
D(unassert, T_UNASSERT, EXTENSION, DEPRECATED) /* SVR4 */ \
D(sccs, T_SCCS, EXTENSION, IN_I) /* SVR4? */
/* #sccs is synonymous with #ident. */
#define do_sccs do_ident
/* Use the table to generate a series of prototypes, an enum for the
directive names, and an array of directive handlers. */
#define D(name, t, o, f) static void do_##name (cpp_reader *);
DIRECTIVE_TABLE
#undef D
#define D(n, tag, o, f) tag,
enum
{
DIRECTIVE_TABLE
N_DIRECTIVES
};
#undef D
#define D(name, t, origin, flags) \
{ do_##name, (const uchar *) #name, \
sizeof #name - 1, origin, flags },
static const directive dtable[] =
{
DIRECTIVE_TABLE
};
#undef D
/* A NULL-terminated array of directive names for use
when suggesting corrections for misspelled directives. */
#define D(name, t, origin, flags) #name,
static const char * const directive_names[] = {
DIRECTIVE_TABLE
NULL
};
#undef D
#undef DIRECTIVE_TABLE
/* Wrapper struct directive for linemarkers.
The origin is more or less true - the original K+R cpp
did use this notation in its preprocessed output. */
static const directive linemarker_dir =
{
do_linemarker, UC"#", 1, KANDR, IN_I
};
/* Skip any remaining tokens in a directive. */
static void
skip_rest_of_line (cpp_reader *pfile)
{
/* Discard all stacked contexts. */
while (pfile->context->prev)
_cpp_pop_context (pfile);
/* Sweep up all tokens remaining on the line. */
if (! SEEN_EOL ())
while (_cpp_lex_token (pfile)->type != CPP_EOF)
;
}
/* Helper function for check_oel. */
static void
check_eol_1 (cpp_reader *pfile, bool expand, enum cpp_warning_reason reason)
{
if (! SEEN_EOL () && (expand
? cpp_get_token (pfile)
: _cpp_lex_token (pfile))->type != CPP_EOF)
cpp_pedwarning (pfile, reason, "extra tokens at end of #%s directive",
pfile->directive->name);
}
/* Variant of check_eol used for Wendif-labels warnings. */
static void
check_eol_endif_labels (cpp_reader *pfile)
{
check_eol_1 (pfile, false, CPP_W_ENDIF_LABELS);
}
/* Ensure there are no stray tokens at the end of a directive. If
EXPAND is true, tokens macro-expanding to nothing are allowed. */
static void
check_eol (cpp_reader *pfile, bool expand)
{
check_eol_1 (pfile, expand, CPP_W_NONE);
}
/* Ensure there are no stray tokens other than comments at the end of
a directive, and gather the comments. */
static const cpp_token **
check_eol_return_comments (cpp_reader *pfile)
{
size_t c;
size_t capacity = 8;
const cpp_token **buf;
buf = XNEWVEC (const cpp_token *, capacity);
c = 0;
if (! SEEN_EOL ())
{
while (1)
{
const cpp_token *tok;
tok = _cpp_lex_token (pfile);
if (tok->type == CPP_EOF)
break;
if (tok->type != CPP_COMMENT)
cpp_error (pfile, CPP_DL_PEDWARN,
"extra tokens at end of #%s directive",
pfile->directive->name);
else
{
if (c + 1 >= capacity)
{
capacity *= 2;
buf = XRESIZEVEC (const cpp_token *, buf, capacity);
}
buf[c] = tok;
++c;
}
}
}
buf[c] = NULL;
return buf;
}
/* Called when entering a directive, _Pragma or command-line directive. */
static void
start_directive (cpp_reader *pfile)
{
/* Setup in-directive state. */
pfile->state.in_directive = 1;
pfile->state.save_comments = 0;
pfile->directive_result.type = CPP_PADDING;
/* Some handlers need the position of the # for diagnostics. */
pfile->directive_line = pfile->line_table->highest_line;
}
/* Called when leaving a directive, _Pragma or command-line directive. */
static void
end_directive (cpp_reader *pfile, int skip_line)
{
if (CPP_OPTION (pfile, traditional))
{
/* Revert change of prepare_directive_trad. */
if (!pfile->state.in_deferred_pragma)
pfile->state.prevent_expansion--;
if (pfile->directive != &dtable[T_DEFINE])
_cpp_remove_overlay (pfile);
}
else if (pfile->state.in_deferred_pragma)
;
/* We don't skip for an assembler #. */
else if (skip_line)
{
skip_rest_of_line (pfile);
if (!pfile->keep_tokens)
{
pfile->cur_run = &pfile->base_run;
pfile->cur_token = pfile->base_run.base;
}
}
/* Restore state. */
pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
pfile->state.in_directive = 0;
pfile->state.in_expression = 0;
pfile->state.angled_headers = 0;
pfile->directive = 0;
}
/* Prepare to handle the directive in pfile->directive. */
static void
prepare_directive_trad (cpp_reader *pfile)
{
if (pfile->directive != &dtable[T_DEFINE])
{
bool no_expand = (pfile->directive
&& ! (pfile->directive->flags & EXPAND));
bool was_skipping = pfile->state.skipping;
pfile->state.in_expression = (pfile->directive == &dtable[T_IF]
|| pfile->directive == &dtable[T_ELIF]);
if (pfile->state.in_expression)
pfile->state.skipping = false;
if (no_expand)
pfile->state.prevent_expansion++;
_cpp_scan_out_logical_line (pfile, NULL, false);
if (no_expand)
pfile->state.prevent_expansion--;
pfile->state.skipping = was_skipping;
_cpp_overlay_buffer (pfile, pfile->out.base,
pfile->out.cur - pfile->out.base);
}
/* Stop ISO C from expanding anything. */
pfile->state.prevent_expansion++;
}
/* Output diagnostics for a directive DIR. INDENTED is nonzero if
the '#' was indented. */
static void
directive_diagnostics (cpp_reader *pfile, const directive *dir, int indented)
{
/* Issue -pedantic or deprecated warnings for extensions. We let
-pedantic take precedence if both are applicable. */
if (! pfile->state.skipping)
{
if (dir->origin == EXTENSION
&& !(dir == &dtable[T_IMPORT] && CPP_OPTION (pfile, objc))
&& CPP_PEDANTIC (pfile))
cpp_error (pfile, CPP_DL_PEDWARN, "#%s is a GCC extension", dir->name);
else if (dir == &dtable[T_WARNING])
{
if (CPP_PEDANTIC (pfile) && !CPP_OPTION (pfile, warning_directive))
{
if (CPP_OPTION (pfile, cplusplus))
cpp_error (pfile, CPP_DL_PEDWARN,
"#%s before C++23 is a GCC extension", dir->name);
else
cpp_error (pfile, CPP_DL_PEDWARN,
"#%s before C2X is a GCC extension", dir->name);
}
else if (CPP_OPTION (pfile, cpp_warn_c11_c2x_compat) > 0)
cpp_warning (pfile, CPP_W_C11_C2X_COMPAT,
"#%s before C2X is a GCC extension", dir->name);
}
else if (((dir->flags & DEPRECATED) != 0
|| (dir == &dtable[T_IMPORT] && !CPP_OPTION (pfile, objc)))
&& CPP_OPTION (pfile, cpp_warn_deprecated))
cpp_warning (pfile, CPP_W_DEPRECATED,
"#%s is a deprecated GCC extension", dir->name);
}
/* Traditionally, a directive is ignored unless its # is in
column 1. Therefore in code intended to work with K+R
compilers, directives added by C89 must have their #
indented, and directives present in traditional C must not.
This is true even of directives in skipped conditional
blocks. #elif cannot be used at all. */
if (CPP_WTRADITIONAL (pfile))
{
if (dir == &dtable[T_ELIF])
cpp_warning (pfile, CPP_W_TRADITIONAL,
"suggest not using #elif in traditional C");
else if (indented && dir->origin == KANDR)
cpp_warning (pfile, CPP_W_TRADITIONAL,
"traditional C ignores #%s with the # indented",
dir->name);
else if (!indented && dir->origin != KANDR)
cpp_warning (pfile, CPP_W_TRADITIONAL,
"suggest hiding #%s from traditional C with an indented #",
dir->name);
}
}
/* Check if we have a known directive. INDENTED is true if the
'#' of the directive was indented. This function is in this file
to save unnecessarily exporting dtable etc. to lex.cc. Returns
nonzero if the line of tokens has been handled, zero if we should
continue processing the line. */
int
_cpp_handle_directive (cpp_reader *pfile, bool indented)
{
const directive *dir = 0;
const cpp_token *dname;
bool was_parsing_args = pfile->state.parsing_args;
bool was_discarding_output = pfile->state.discarding_output;
int skip = 1;
if (was_discarding_output)
pfile->state.prevent_expansion = 0;
if (was_parsing_args)
{
if (CPP_OPTION (pfile, cpp_pedantic))
cpp_error (pfile, CPP_DL_PEDWARN,
"embedding a directive within macro arguments is not portable");
pfile->state.parsing_args = 0;
pfile->state.prevent_expansion = 0;
}
start_directive (pfile);
dname = _cpp_lex_token (pfile);
if (dname->type == CPP_NAME)
{
if (dname->val.node.node->is_directive)
{
dir = &dtable[dname->val.node.node->directive_index];
if ((dir->flags & ELIFDEF)
&& !CPP_OPTION (pfile, elifdef)
/* For -std=gnu* modes elifdef is supported with
a pedwarn if pedantic. */
&& CPP_OPTION (pfile, std))
dir = 0;
}
}
/* We do not recognize the # followed by a number extension in
assembler code. */
else if (dname->type == CPP_NUMBER && CPP_OPTION (pfile, lang) != CLK_ASM)
{
dir = &linemarker_dir;
if (CPP_PEDANTIC (pfile) && ! CPP_OPTION (pfile, preprocessed)
&& ! pfile->state.skipping)
cpp_error (pfile, CPP_DL_PEDWARN,
"style of line directive is a GCC extension");
}
if (dir)
{
/* If we have a directive that is not an opening conditional,
invalidate any control macro. */
if (! (dir->flags & IF_COND))
pfile->mi_valid = false;
/* Kluge alert. In order to be sure that code like this
#define HASH #
HASH define foo bar
does not cause '#define foo bar' to get executed when
compiled with -save-temps, we recognize directives in
-fpreprocessed mode only if the # is in column 1. macro.cc
puts a space in front of any '#' at the start of a macro.
We exclude the -fdirectives-only case because macro expansion
has not been performed yet, and block comments can cause spaces
to precede the directive. */
if (CPP_OPTION (pfile, preprocessed)
&& !CPP_OPTION (pfile, directives_only)
&& (indented || !(dir->flags & IN_I)))
{
skip = 0;
dir = 0;
}
else
{
/* In failed conditional groups, all non-conditional
directives are ignored. Before doing that, whether
skipping or not, we should lex angle-bracketed headers
correctly, and maybe output some diagnostics. */
pfile->state.angled_headers = dir->flags & INCL;
pfile->state.directive_wants_padding = dir->flags & INCL;
if (! CPP_OPTION (pfile, preprocessed))
directive_diagnostics (pfile, dir, indented);
if (pfile->state.skipping && !(dir->flags & COND))
dir = 0;
}
}
else if (dname->type == CPP_EOF)
; /* CPP_EOF is the "null directive". */
else
{
/* An unknown directive. Don't complain about it in assembly
source: we don't know where the comments are, and # may
introduce assembler pseudo-ops. Don't complain about invalid
directives in skipped conditional groups (6.10 p4). */
if (CPP_OPTION (pfile, lang) == CLK_ASM)
skip = 0;
else if (!pfile->state.skipping)
{
const char *unrecognized
= (const char *)cpp_token_as_text (pfile, dname);
const char *hint = NULL;
/* Call back into gcc to get a spelling suggestion. Ideally
we'd just use best_match from gcc/spellcheck.h (and filter
out the uncommon directives), but that requires moving it
to a support library. */
if (pfile->cb.get_suggestion)
hint = pfile->cb.get_suggestion (pfile, unrecognized,
directive_names);
if (hint)
{
rich_location richloc (pfile->line_table, dname->src_loc);
source_range misspelled_token_range
= get_range_from_loc (pfile->line_table, dname->src_loc);
richloc.add_fixit_replace (misspelled_token_range, hint);
cpp_error_at (pfile, CPP_DL_ERROR, &richloc,
"invalid preprocessing directive #%s;"
" did you mean #%s?",
unrecognized, hint);
}
else
cpp_error (pfile, CPP_DL_ERROR,
"invalid preprocessing directive #%s",
unrecognized);
}
}
pfile->directive = dir;
if (CPP_OPTION (pfile, traditional))
prepare_directive_trad (pfile);
if (dir)
pfile->directive->handler (pfile);
else if (skip == 0)
_cpp_backup_tokens (pfile, 1);
end_directive (pfile, skip);
if (was_parsing_args && !pfile->state.in_deferred_pragma)
{
/* Restore state when within macro args. */
pfile->state.parsing_args = 2;
pfile->state.prevent_expansion = 1;
}
if (was_discarding_output)
pfile->state.prevent_expansion = 1;
return skip;
}
/* Directive handler wrapper used by the command line option
processor. BUF is \n terminated. */
static void
run_directive (cpp_reader *pfile, int dir_no, const char *buf, size_t count)
{
cpp_push_buffer (pfile, (const uchar *) buf, count,
/* from_stage3 */ true);
start_directive (pfile);
/* This is a short-term fix to prevent a leading '#' being
interpreted as a directive. */
_cpp_clean_line (pfile);
pfile->directive = &dtable[dir_no];
if (CPP_OPTION (pfile, traditional))
prepare_directive_trad (pfile);
pfile->directive->handler (pfile);
end_directive (pfile, 1);
_cpp_pop_buffer (pfile);
}
/* Checks for validity the macro name in #define, #undef, #ifdef and
#ifndef directives. IS_DEF_OR_UNDEF is true if this call is
processing a #define or #undefine directive, and false
otherwise. */
static cpp_hashnode *
lex_macro_node (cpp_reader *pfile, bool is_def_or_undef)
{
const cpp_token *token = _cpp_lex_token (pfile);
/* The token immediately after #define must be an identifier. That
identifier may not be "defined", per C99 6.10.8p4.
In C++, it may not be any of the "named operators" either,
per C++98 [lex.digraph], [lex.key].
Finally, the identifier may not have been poisoned. (In that case
the lexer has issued the error message for us.) */
if (token->type == CPP_NAME)
{
cpp_hashnode *node = token->val.node.node;
if (is_def_or_undef
&& node == pfile->spec_nodes.n_defined)
cpp_error (pfile, CPP_DL_ERROR,
"\"%s\" cannot be used as a macro name",
NODE_NAME (node));
else if (! (node->flags & NODE_POISONED))
return node;
}
else if (token->flags & NAMED_OP)
cpp_error (pfile, CPP_DL_ERROR,
"\"%s\" cannot be used as a macro name as it is an operator in C++",
NODE_NAME (token->val.node.node));
else if (token->type == CPP_EOF)
cpp_error (pfile, CPP_DL_ERROR, "no macro name given in #%s directive",
pfile->directive->name);
else
cpp_error (pfile, CPP_DL_ERROR, "macro names must be identifiers");
return NULL;
}
/* Process a #define directive. Most work is done in macro.cc. */
static void
do_define (cpp_reader *pfile)
{
cpp_hashnode *node = lex_macro_node (pfile, true);
if (node)
{
/* If we have been requested to expand comments into macros,
then re-enable saving of comments. */
pfile->state.save_comments =
! CPP_OPTION (pfile, discard_comments_in_macro_exp);
if (pfile->cb.before_define)
pfile->cb.before_define (pfile);
if (_cpp_create_definition (pfile, node))
if (pfile->cb.define)
pfile->cb.define (pfile, pfile->directive_line, node);
node->flags &= ~NODE_USED;
}
}
/* Handle #undef. Mark the identifier NT_VOID in the hash table. */
static void
do_undef (cpp_reader *pfile)
{
cpp_hashnode *node = lex_macro_node (pfile, true);
if (node)
{
if (pfile->cb.before_define)
pfile->cb.before_define (pfile);
if (pfile->cb.undef)
pfile->cb.undef (pfile, pfile->directive_line, node);
/* 6.10.3.5 paragraph 2: [#undef] is ignored if the specified
identifier is not currently defined as a macro name. */
if (cpp_macro_p (node))
{
if (node->flags & NODE_WARN)
cpp_error (pfile, CPP_DL_WARNING,
"undefining \"%s\"", NODE_NAME (node));
else if (cpp_builtin_macro_p (node)
&& CPP_OPTION (pfile, warn_builtin_macro_redefined))
cpp_warning_with_line (pfile, CPP_W_BUILTIN_MACRO_REDEFINED,
pfile->directive_line, 0,
"undefining \"%s\"", NODE_NAME (node));
if (node->value.macro
&& CPP_OPTION (pfile, warn_unused_macros))
_cpp_warn_if_unused_macro (pfile, node, NULL);
_cpp_free_definition (node);
}
}
check_eol (pfile, false);
}
/* Undefine a single macro/assertion/whatever. */
static int
undefine_macros (cpp_reader *pfile ATTRIBUTE_UNUSED, cpp_hashnode *h,
void *data_p ATTRIBUTE_UNUSED)
{
/* Body of _cpp_free_definition inlined here for speed.
Macros and assertions no longer have anything to free. */
h->type = NT_VOID;
h->value.answers = NULL;
h->flags &= ~(NODE_POISONED|NODE_DISABLED|NODE_USED);
return 1;
}
/* Undefine all macros and assertions. */
void
cpp_undef_all (cpp_reader *pfile)
{
cpp_forall_identifiers (pfile, undefine_macros, NULL);
}
/* Helper routine used by parse_include. Reinterpret the current line
as an h-char-sequence (< ... >); we are looking at the first token
after the <. Returns a malloced filename. */
static char *
glue_header_name (cpp_reader *pfile)
{
const cpp_token *token;
char *buffer;
size_t len, total_len = 0, capacity = 1024;
/* To avoid lexed tokens overwriting our glued name, we can only
allocate from the string pool once we've lexed everything. */
buffer = XNEWVEC (char, capacity);
for (;;)
{
token = get_token_no_padding (pfile);
if (token->type == CPP_GREATER)
break;
if (token->type == CPP_EOF)
{
cpp_error (pfile, CPP_DL_ERROR, "missing terminating > character");
break;
}
len = cpp_token_len (token) + 2; /* Leading space, terminating \0. */
if (total_len + len > capacity)
{
capacity = (capacity + len) * 2;
buffer = XRESIZEVEC (char, buffer, capacity);
}
if (token->flags & PREV_WHITE)
buffer[total_len++] = ' ';
total_len = (cpp_spell_token (pfile, token, (uchar *) &buffer[total_len],
true)
- (uchar *) buffer);
}
buffer[total_len] = '\0';
return buffer;
}
/* Returns the file name of #include, #include_next, #import and
#pragma dependency. The string is malloced and the caller should
free it. Returns NULL on error. LOCATION is the source location
of the file name. */
static const char *
parse_include (cpp_reader *pfile, int *pangle_brackets,
const cpp_token ***buf, location_t *location)
{
char *fname;
const cpp_token *header;
/* Allow macro expansion. */
header = get_token_no_padding (pfile);
*location = header->src_loc;
if ((header->type == CPP_STRING && header->val.str.text[0] != 'R')
|| header->type == CPP_HEADER_NAME)
{
fname = XNEWVEC (char, header->val.str.len - 1);
memcpy (fname, header->val.str.text + 1, header->val.str.len - 2);
fname[header->val.str.len - 2] = '\0';
*pangle_brackets = header->type == CPP_HEADER_NAME;
}
else if (header->type == CPP_LESS)
{
fname = glue_header_name (pfile);
*pangle_brackets = 1;
}
else
{
const unsigned char *dir;
if (pfile->directive == &dtable[T_PRAGMA])
dir = UC"pragma dependency";
else
dir = pfile->directive->name;
cpp_error (pfile, CPP_DL_ERROR, "#%s expects \"FILENAME\" or <FILENAME>",
dir);
return NULL;
}
if (pfile->directive == &dtable[T_PRAGMA])
{
/* This pragma allows extra tokens after the file name. */
}
else if (buf == NULL || CPP_OPTION (pfile, discard_comments))
check_eol (pfile, true);
else
{
/* If we are not discarding comments, then gather them while
doing the eol check. */
*buf = check_eol_return_comments (pfile);
}
return fname;
}
/* Handle #include, #include_next and #import. */
static void
do_include_common (cpp_reader *pfile, enum include_type type)
{
const char *fname;
int angle_brackets;
const cpp_token **buf = NULL;
location_t location;
/* Re-enable saving of comments if requested, so that the include
callback can dump comments which follow #include. */
pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
/* Tell the lexer this is an include directive -- we want it to
increment the line number even if this is the last line of a file. */
pfile->state.in_directive = 2;
fname = parse_include (pfile, &angle_brackets, &buf, &location);
if (!fname)
goto done;
if (!*fname)
{
cpp_error_with_line (pfile, CPP_DL_ERROR, location, 0,
"empty filename in #%s",
pfile->directive->name);
goto done;
}
/* Prevent #include recursion. */
if (pfile->line_table->depth >= CPP_OPTION (pfile, max_include_depth))
cpp_error (pfile,
CPP_DL_ERROR,
"#include nested depth %u exceeds maximum of %u"
" (use -fmax-include-depth=DEPTH to increase the maximum)",
pfile->line_table->depth,
CPP_OPTION (pfile, max_include_depth));
else
{
/* Get out of macro context, if we are. */
skip_rest_of_line (pfile);
if (pfile->cb.include)
pfile->cb.include (pfile, pfile->directive_line,
pfile->directive->name, fname, angle_brackets,
buf);
_cpp_stack_include (pfile, fname, angle_brackets, type, location);
}
done:
XDELETEVEC (fname);
if (buf)
XDELETEVEC (buf);
}
static void
do_include (cpp_reader *pfile)
{
do_include_common (pfile, IT_INCLUDE);
}
static void
do_import (cpp_reader *pfile)
{
do_include_common (pfile, IT_IMPORT);
}
static void
do_include_next (cpp_reader *pfile)
{
enum include_type type = IT_INCLUDE_NEXT;
/* If this is the primary source file, warn and use the normal
search logic. */
if (_cpp_in_main_source_file (pfile))
{
cpp_error (pfile, CPP_DL_WARNING,
"#include_next in primary source file");
type = IT_INCLUDE;
}
do_include_common (pfile, type);
}
/* Subroutine of do_linemarker. Read possible flags after file name.
LAST is the last flag seen; 0 if this is the first flag. Return the
flag if it is valid, 0 at the end of the directive. Otherwise
complain. */
static unsigned int
read_flag (cpp_reader *pfile, unsigned int last)
{
const cpp_token *token = _cpp_lex_token (pfile);
if (token->type == CPP_NUMBER && token->val.str.len == 1)
{
unsigned int flag = token->val.str.text[0] - '0';
if (flag > last && flag <= 4
&& (flag != 4 || last == 3)
&& (flag != 2 || last == 0))
return flag;
}
if (token->type != CPP_EOF)
cpp_error (pfile, CPP_DL_ERROR, "invalid flag \"%s\" in line directive",
cpp_token_as_text (pfile, token));
return 0;
}
/* Subroutine of do_line and do_linemarker. Convert a number in STR,
of length LEN, to binary; store it in NUMP, and return false if the
number was well-formed, true if not. WRAPPED is set to true if the
number did not fit into 'linenum_type'. */
static bool
strtolinenum (const uchar *str, size_t len, linenum_type *nump, bool *wrapped)
{
linenum_type reg = 0;
uchar c;
bool seen_digit_sep = false;
*wrapped = false;
while (len--)
{
c = *str++;
if (!seen_digit_sep && c == '\'' && len)
{
seen_digit_sep = true;
continue;
}
if (!ISDIGIT (c))
return true;
seen_digit_sep = false;
if (reg > ((linenum_type) -1) / 10)
*wrapped = true;
reg *= 10;
if (reg > ((linenum_type) -1) - (c - '0'))
*wrapped = true;
reg += c - '0';
}
*nump = reg;
return false;
}
/* Interpret #line command.
Note that the filename string (if any) is a true string constant
(escapes are interpreted). */
static void
do_line (cpp_reader *pfile)
{
class line_maps *line_table = pfile->line_table;
const line_map_ordinary *map = LINEMAPS_LAST_ORDINARY_MAP (line_table);
/* skip_rest_of_line() may cause line table to be realloc()ed so note down
sysp right now. */
unsigned char map_sysp = ORDINARY_MAP_IN_SYSTEM_HEADER_P (map);
const cpp_token *token;
const char *new_file = ORDINARY_MAP_FILE_NAME (map);
linenum_type new_lineno;
/* C99 raised the minimum limit on #line numbers. */
linenum_type cap = CPP_OPTION (pfile, c99) ? 2147483647 : 32767;
bool wrapped;