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gcc/libcpp/init.c
Nathan Sidwell 9844497a93 preprocessor: main file searching 
This adds the capability to locate the main file on the user or system
include paths.  That's extremely useful to users building header
units.  Searching has to be requiested (plain header-unit compilation
will not search).  Also, to make include_next work as expected when
building a header unit, we add a mechanism to retrofit a non-searched
source file as one on the include path.

	libcpp/
	* include/cpplib.h (enum cpp_main_search): New.
	(struct cpp_options): Add main_search field.
	(cpp_main_loc): Declare.
	(cpp_retrofit_as_include): Declare.
	* internal.h (struct cpp_reader): Add main_loc field.
	(_cpp_in_main_source_file): Not main if main is a header.
	* init.c (cpp_read_main_file): Use main_search option to locate
	main file.  Set main_loc
	* files.c (cpp_retrofit_as_include): New.
2020-11-19 07:05:08 -08:00

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/* CPP Library.
Copyright (C) 1986-2020 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 "localedir.h"
#include "filenames.h"
#ifndef ENABLE_CANONICAL_SYSTEM_HEADERS
#ifdef HAVE_DOS_BASED_FILE_SYSTEM
#define ENABLE_CANONICAL_SYSTEM_HEADERS 1
#else
#define ENABLE_CANONICAL_SYSTEM_HEADERS 0
#endif
#endif
static void init_library (void);
static void mark_named_operators (cpp_reader *, int);
static bool read_original_filename (cpp_reader *);
static void read_original_directory (cpp_reader *);
static void post_options (cpp_reader *);
/* If we have designated initializers (GCC >2.7) these tables can be
initialized, constant data. Otherwise, they have to be filled in at
runtime. */
#if HAVE_DESIGNATED_INITIALIZERS
#define init_trigraph_map() /* Nothing. */
#define TRIGRAPH_MAP \
__extension__ const uchar _cpp_trigraph_map[UCHAR_MAX + 1] = {
#define END };
#define s(p, v) [p] = v,
#else
#define TRIGRAPH_MAP uchar _cpp_trigraph_map[UCHAR_MAX + 1] = { 0 }; \
static void init_trigraph_map (void) { \
unsigned char *x = _cpp_trigraph_map;
#define END }
#define s(p, v) x[p] = v;
#endif
TRIGRAPH_MAP
s('=', '#') s(')', ']') s('!', '|')
s('(', '[') s('\'', '^') s('>', '}')
s('/', '\\') s('<', '{') s('-', '~')
END
#undef s
#undef END
#undef TRIGRAPH_MAP
/* A set of booleans indicating what CPP features each source language
requires. */
struct lang_flags
{
char c99;
char cplusplus;
char extended_numbers;
char extended_identifiers;
char c11_identifiers;
char std;
char digraphs;
char uliterals;
char rliterals;
char user_literals;
char binary_constants;
char digit_separators;
char trigraphs;
char utf8_char_literals;
char va_opt;
char scope;
char dfp_constants;
};
static const struct lang_flags lang_defaults[] =
{ /* c99 c++ xnum xid c11 std digr ulit rlit udlit bincst digsep trig u8chlit vaopt scope dfp */
/* GNUC89 */ { 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0 },
/* GNUC99 */ { 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0 },
/* GNUC11 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0 },
/* GNUC17 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0 },
/* GNUC2X */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1 },
/* STDC89 */ { 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
/* STDC94 */ { 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
/* STDC99 */ { 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
/* STDC11 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
/* STDC17 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
/* STDC2X */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1 },
/* GNUCXX */ { 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0 },
/* CXX98 */ { 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0 },
/* GNUCXX11 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0 },
/* CXX11 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0 },
/* GNUCXX14 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0 },
/* CXX14 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0 },
/* GNUCXX17 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
/* CXX17 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0 },
/* GNUCXX20 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
/* CXX20 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
/* ASM */ { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
};
/* Sets internal flags correctly for a given language. */
void
cpp_set_lang (cpp_reader *pfile, enum c_lang lang)
{
const struct lang_flags *l = &lang_defaults[(int) lang];
CPP_OPTION (pfile, lang) = lang;
CPP_OPTION (pfile, c99) = l->c99;
CPP_OPTION (pfile, cplusplus) = l->cplusplus;
CPP_OPTION (pfile, extended_numbers) = l->extended_numbers;
CPP_OPTION (pfile, extended_identifiers) = l->extended_identifiers;
CPP_OPTION (pfile, c11_identifiers) = l->c11_identifiers;
CPP_OPTION (pfile, std) = l->std;
CPP_OPTION (pfile, digraphs) = l->digraphs;
CPP_OPTION (pfile, uliterals) = l->uliterals;
CPP_OPTION (pfile, rliterals) = l->rliterals;
CPP_OPTION (pfile, user_literals) = l->user_literals;
CPP_OPTION (pfile, binary_constants) = l->binary_constants;
CPP_OPTION (pfile, digit_separators) = l->digit_separators;
CPP_OPTION (pfile, trigraphs) = l->trigraphs;
CPP_OPTION (pfile, utf8_char_literals) = l->utf8_char_literals;
CPP_OPTION (pfile, va_opt) = l->va_opt;
CPP_OPTION (pfile, scope) = l->scope;
CPP_OPTION (pfile, dfp_constants) = l->dfp_constants;
}
/* Initialize library global state. */
static void
init_library (void)
{
static int initialized = 0;
if (! initialized)
{
initialized = 1;
_cpp_init_lexer ();
/* Set up the trigraph map. This doesn't need to do anything if
we were compiled with a compiler that supports C99 designated
initializers. */
init_trigraph_map ();
#ifdef ENABLE_NLS
(void) bindtextdomain (PACKAGE, LOCALEDIR);
#endif
}
}
/* Initialize a cpp_reader structure. */
cpp_reader *
cpp_create_reader (enum c_lang lang, cpp_hash_table *table,
class line_maps *line_table)
{
cpp_reader *pfile;
/* Initialize this instance of the library if it hasn't been already. */
init_library ();
pfile = XCNEW (cpp_reader);
memset (&pfile->base_context, 0, sizeof (pfile->base_context));
cpp_set_lang (pfile, lang);
CPP_OPTION (pfile, warn_multichar) = 1;
CPP_OPTION (pfile, discard_comments) = 1;
CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1;
CPP_OPTION (pfile, max_include_depth) = 200;
CPP_OPTION (pfile, operator_names) = 1;
CPP_OPTION (pfile, warn_trigraphs) = 2;
CPP_OPTION (pfile, warn_endif_labels) = 1;
CPP_OPTION (pfile, cpp_warn_c90_c99_compat) = -1;
CPP_OPTION (pfile, cpp_warn_c11_c2x_compat) = -1;
CPP_OPTION (pfile, cpp_warn_cxx11_compat) = 0;
CPP_OPTION (pfile, cpp_warn_deprecated) = 1;
CPP_OPTION (pfile, cpp_warn_long_long) = 0;
CPP_OPTION (pfile, dollars_in_ident) = 1;
CPP_OPTION (pfile, warn_dollars) = 1;
CPP_OPTION (pfile, warn_variadic_macros) = 1;
CPP_OPTION (pfile, warn_builtin_macro_redefined) = 1;
CPP_OPTION (pfile, cpp_warn_implicit_fallthrough) = 0;
/* By default, track locations of tokens resulting from macro
expansion. The '2' means, track the locations with the highest
accuracy. Read the comments for struct
cpp_options::track_macro_expansion to learn about the other
values. */
CPP_OPTION (pfile, track_macro_expansion) = 2;
CPP_OPTION (pfile, warn_normalize) = normalized_C;
CPP_OPTION (pfile, warn_literal_suffix) = 1;
CPP_OPTION (pfile, canonical_system_headers)
= ENABLE_CANONICAL_SYSTEM_HEADERS;
CPP_OPTION (pfile, ext_numeric_literals) = 1;
CPP_OPTION (pfile, warn_date_time) = 0;
/* Default CPP arithmetic to something sensible for the host for the
benefit of dumb users like fix-header. */
CPP_OPTION (pfile, precision) = CHAR_BIT * sizeof (long);
CPP_OPTION (pfile, char_precision) = CHAR_BIT;
CPP_OPTION (pfile, wchar_precision) = CHAR_BIT * sizeof (int);
CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int);
CPP_OPTION (pfile, unsigned_char) = 0;
CPP_OPTION (pfile, unsigned_wchar) = 1;
CPP_OPTION (pfile, bytes_big_endian) = 1; /* does not matter */
/* Default to no charset conversion. */
CPP_OPTION (pfile, narrow_charset) = _cpp_default_encoding ();
CPP_OPTION (pfile, wide_charset) = 0;
/* Default the input character set to UTF-8. */
CPP_OPTION (pfile, input_charset) = _cpp_default_encoding ();
/* A fake empty "directory" used as the starting point for files
looked up without a search path. Name cannot be '/' because we
don't want to prepend anything at all to filenames using it. All
other entries are correct zero-initialized. */
pfile->no_search_path.name = (char *) "";
/* Initialize the line map. */
pfile->line_table = line_table;
/* Initialize lexer state. */
pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
/* Set up static tokens. */
pfile->avoid_paste.type = CPP_PADDING;
pfile->avoid_paste.val.source = NULL;
pfile->avoid_paste.src_loc = 0;
pfile->endarg.type = CPP_EOF;
pfile->endarg.flags = 0;
pfile->endarg.src_loc = 0;
/* Create a token buffer for the lexer. */
_cpp_init_tokenrun (&pfile->base_run, 250);
pfile->cur_run = &pfile->base_run;
pfile->cur_token = pfile->base_run.base;
/* Initialize the base context. */
pfile->context = &pfile->base_context;
pfile->base_context.c.macro = 0;
pfile->base_context.prev = pfile->base_context.next = 0;
/* Aligned and unaligned storage. */
pfile->a_buff = _cpp_get_buff (pfile, 0);
pfile->u_buff = _cpp_get_buff (pfile, 0);
/* Initialize table for push_macro/pop_macro. */
pfile->pushed_macros = 0;
/* Do not force token locations by default. */
pfile->forced_token_location = 0;
/* Note the timestamp is unset. */
pfile->time_stamp = time_t (-1);
pfile->time_stamp_kind = 0;
/* The expression parser stack. */
_cpp_expand_op_stack (pfile);
/* Initialize the buffer obstack. */
obstack_specify_allocation (&pfile->buffer_ob, 0, 0, xmalloc, free);
_cpp_init_files (pfile);
_cpp_init_hashtable (pfile, table);
return pfile;
}
/* Set the line_table entry in PFILE. This is called after reading a
PCH file, as the old line_table will be incorrect. */
void
cpp_set_line_map (cpp_reader *pfile, class line_maps *line_table)
{
pfile->line_table = line_table;
}
/* Free resources used by PFILE. Accessing PFILE after this function
returns leads to undefined behavior. Returns the error count. */
void
cpp_destroy (cpp_reader *pfile)
{
cpp_context *context, *contextn;
struct def_pragma_macro *pmacro;
tokenrun *run, *runn;
int i;
free (pfile->op_stack);
while (CPP_BUFFER (pfile) != NULL)
_cpp_pop_buffer (pfile);
free (pfile->out.base);
if (pfile->macro_buffer)
{
free (pfile->macro_buffer);
pfile->macro_buffer = NULL;
pfile->macro_buffer_len = 0;
}
if (pfile->deps)
deps_free (pfile->deps);
obstack_free (&pfile->buffer_ob, 0);
_cpp_destroy_hashtable (pfile);
_cpp_cleanup_files (pfile);
_cpp_destroy_iconv (pfile);
_cpp_free_buff (pfile->a_buff);
_cpp_free_buff (pfile->u_buff);
_cpp_free_buff (pfile->free_buffs);
for (run = &pfile->base_run; run; run = runn)
{
runn = run->next;
free (run->base);
if (run != &pfile->base_run)
free (run);
}
for (context = pfile->base_context.next; context; context = contextn)
{
contextn = context->next;
free (context);
}
if (pfile->comments.entries)
{
for (i = 0; i < pfile->comments.count; i++)
free (pfile->comments.entries[i].comment);
free (pfile->comments.entries);
}
if (pfile->pushed_macros)
{
do
{
pmacro = pfile->pushed_macros;
pfile->pushed_macros = pmacro->next;
free (pmacro->name);
free (pmacro);
}
while (pfile->pushed_macros);
}
free (pfile);
}
/* This structure defines one built-in identifier. A node will be
entered in the hash table under the name NAME, with value VALUE.
There are two tables of these. builtin_array holds all the
"builtin" macros: these are handled by builtin_macro() in
macro.c. Builtin is somewhat of a misnomer -- the property of
interest is that these macros require special code to compute their
expansions. The value is a "cpp_builtin_type" enumerator.
operator_array holds the C++ named operators. These are keywords
which act as aliases for punctuators. In C++, they cannot be
altered through #define, and #if recognizes them as operators. In
C, these are not entered into the hash table at all (but see
<iso646.h>). The value is a token-type enumerator. */
struct builtin_macro
{
const uchar *const name;
const unsigned short len;
const unsigned short value;
const bool always_warn_if_redefined;
};
#define B(n, t, f) { DSC(n), t, f }
static const struct builtin_macro builtin_array[] =
{
B("__TIMESTAMP__", BT_TIMESTAMP, false),
B("__TIME__", BT_TIME, false),
B("__DATE__", BT_DATE, false),
B("__FILE__", BT_FILE, false),
B("__BASE_FILE__", BT_BASE_FILE, false),
B("__LINE__", BT_SPECLINE, true),
B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL, true),
B("__COUNTER__", BT_COUNTER, true),
/* Make sure to update the list of built-in
function-like macros in traditional.c:
fun_like_macro() when adding more following */
B("__has_attribute", BT_HAS_ATTRIBUTE, true),
B("__has_c_attribute", BT_HAS_STD_ATTRIBUTE, true),
B("__has_cpp_attribute", BT_HAS_ATTRIBUTE, true),
B("__has_builtin", BT_HAS_BUILTIN, true),
B("__has_include", BT_HAS_INCLUDE, true),
B("__has_include_next",BT_HAS_INCLUDE_NEXT, true),
/* Keep builtins not used for -traditional-cpp at the end, and
update init_builtins() if any more are added. */
B("_Pragma", BT_PRAGMA, true),
B("__STDC__", BT_STDC, true),
};
#undef B
struct builtin_operator
{
const uchar *const name;
const unsigned short len;
const unsigned short value;
};
#define B(n, t) { DSC(n), t }
static const struct builtin_operator operator_array[] =
{
B("and", CPP_AND_AND),
B("and_eq", CPP_AND_EQ),
B("bitand", CPP_AND),
B("bitor", CPP_OR),
B("compl", CPP_COMPL),
B("not", CPP_NOT),
B("not_eq", CPP_NOT_EQ),
B("or", CPP_OR_OR),
B("or_eq", CPP_OR_EQ),
B("xor", CPP_XOR),
B("xor_eq", CPP_XOR_EQ)
};
#undef B
/* Mark the C++ named operators in the hash table. */
static void
mark_named_operators (cpp_reader *pfile, int flags)
{
const struct builtin_operator *b;
for (b = operator_array;
b < (operator_array + ARRAY_SIZE (operator_array));
b++)
{
cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
hp->flags |= flags;
hp->is_directive = 0;
hp->directive_index = b->value;
}
}
/* Helper function of cpp_type2name. Return the string associated with
named operator TYPE. */
const char *
cpp_named_operator2name (enum cpp_ttype type)
{
const struct builtin_operator *b;
for (b = operator_array;
b < (operator_array + ARRAY_SIZE (operator_array));
b++)
{
if (type == b->value)
return (const char *) b->name;
}
return NULL;
}
void
cpp_init_special_builtins (cpp_reader *pfile)
{
const struct builtin_macro *b;
size_t n = ARRAY_SIZE (builtin_array);
if (CPP_OPTION (pfile, traditional))
n -= 2;
else if (! CPP_OPTION (pfile, stdc_0_in_system_headers)
|| CPP_OPTION (pfile, std))
n--;
for (b = builtin_array; b < builtin_array + n; b++)
{
if ((b->value == BT_HAS_ATTRIBUTE
|| b->value == BT_HAS_STD_ATTRIBUTE
|| b->value == BT_HAS_BUILTIN)
&& (CPP_OPTION (pfile, lang) == CLK_ASM
|| pfile->cb.has_attribute == NULL))
continue;
cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
hp->type = NT_BUILTIN_MACRO;
if (b->always_warn_if_redefined)
hp->flags |= NODE_WARN;
hp->value.builtin = (enum cpp_builtin_type) b->value;
}
}
/* Restore macro C to builtin macro definition. */
void
_cpp_restore_special_builtin (cpp_reader *pfile, struct def_pragma_macro *c)
{
size_t len = strlen (c->name);
for (const struct builtin_macro *b = builtin_array;
b < builtin_array + ARRAY_SIZE (builtin_array); b++)
if (b->len == len && memcmp (c->name, b->name, len + 1) == 0)
{
cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
hp->type = NT_BUILTIN_MACRO;
if (b->always_warn_if_redefined)
hp->flags |= NODE_WARN;
hp->value.builtin = (enum cpp_builtin_type) b->value;
}
}
/* Read the builtins table above and enter them, and language-specific
macros, into the hash table. HOSTED is true if this is a hosted
environment. */
void
cpp_init_builtins (cpp_reader *pfile, int hosted)
{
cpp_init_special_builtins (pfile);
if (!CPP_OPTION (pfile, traditional)
&& (! CPP_OPTION (pfile, stdc_0_in_system_headers)
|| CPP_OPTION (pfile, std)))
_cpp_define_builtin (pfile, "__STDC__ 1");
if (CPP_OPTION (pfile, cplusplus))
{
if (CPP_OPTION (pfile, lang) == CLK_CXX20
|| CPP_OPTION (pfile, lang) == CLK_GNUCXX20)
_cpp_define_builtin (pfile, "__cplusplus 201709L");
else if (CPP_OPTION (pfile, lang) == CLK_CXX17
|| CPP_OPTION (pfile, lang) == CLK_GNUCXX17)
_cpp_define_builtin (pfile, "__cplusplus 201703L");
else if (CPP_OPTION (pfile, lang) == CLK_CXX14
|| CPP_OPTION (pfile, lang) == CLK_GNUCXX14)
_cpp_define_builtin (pfile, "__cplusplus 201402L");
else if (CPP_OPTION (pfile, lang) == CLK_CXX11
|| CPP_OPTION (pfile, lang) == CLK_GNUCXX11)
_cpp_define_builtin (pfile, "__cplusplus 201103L");
else
_cpp_define_builtin (pfile, "__cplusplus 199711L");
}
else if (CPP_OPTION (pfile, lang) == CLK_ASM)
_cpp_define_builtin (pfile, "__ASSEMBLER__ 1");
else if (CPP_OPTION (pfile, lang) == CLK_STDC94)
_cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L");
else if (CPP_OPTION (pfile, lang) == CLK_STDC2X
|| CPP_OPTION (pfile, lang) == CLK_GNUC2X)
_cpp_define_builtin (pfile, "__STDC_VERSION__ 202000L");
else if (CPP_OPTION (pfile, lang) == CLK_STDC17
|| CPP_OPTION (pfile, lang) == CLK_GNUC17)
_cpp_define_builtin (pfile, "__STDC_VERSION__ 201710L");
else if (CPP_OPTION (pfile, lang) == CLK_STDC11
|| CPP_OPTION (pfile, lang) == CLK_GNUC11)
_cpp_define_builtin (pfile, "__STDC_VERSION__ 201112L");
else if (CPP_OPTION (pfile, c99))
_cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L");
if (CPP_OPTION (pfile, uliterals)
&& !(CPP_OPTION (pfile, cplusplus)
&& (CPP_OPTION (pfile, lang) == CLK_GNUCXX
|| CPP_OPTION (pfile, lang) == CLK_CXX98)))
{
_cpp_define_builtin (pfile, "__STDC_UTF_16__ 1");
_cpp_define_builtin (pfile, "__STDC_UTF_32__ 1");
}
if (hosted)
_cpp_define_builtin (pfile, "__STDC_HOSTED__ 1");
else
_cpp_define_builtin (pfile, "__STDC_HOSTED__ 0");
if (CPP_OPTION (pfile, objc))
_cpp_define_builtin (pfile, "__OBJC__ 1");
}
/* Sanity-checks are dependent on command-line options, so it is
called as a subroutine of cpp_read_main_file. */
#if CHECKING_P
static void sanity_checks (cpp_reader *);
static void sanity_checks (cpp_reader *pfile)
{
cppchar_t test = 0;
size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part);
/* Sanity checks for assumptions about CPP arithmetic and target
type precisions made by cpplib. */
test--;
if (test < 1)
cpp_error (pfile, CPP_DL_ICE, "cppchar_t must be an unsigned type");
if (CPP_OPTION (pfile, precision) > max_precision)
cpp_error (pfile, CPP_DL_ICE,
"preprocessor arithmetic has maximum precision of %lu bits;"
" target requires %lu bits",
(unsigned long) max_precision,
(unsigned long) CPP_OPTION (pfile, precision));
if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision))
cpp_error (pfile, CPP_DL_ICE,
"CPP arithmetic must be at least as precise as a target int");
if (CPP_OPTION (pfile, char_precision) < 8)
cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide");
if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision))
cpp_error (pfile, CPP_DL_ICE,
"target wchar_t is narrower than target char");
if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision))
cpp_error (pfile, CPP_DL_ICE,
"target int is narrower than target char");
/* This is assumed in eval_token() and could be fixed if necessary. */
if (sizeof (cppchar_t) > sizeof (cpp_num_part))
cpp_error (pfile, CPP_DL_ICE,
"CPP half-integer narrower than CPP character");
if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T)
cpp_error (pfile, CPP_DL_ICE,
"CPP on this host cannot handle wide character constants over"
" %lu bits, but the target requires %lu bits",
(unsigned long) BITS_PER_CPPCHAR_T,
(unsigned long) CPP_OPTION (pfile, wchar_precision));
}
#else
# define sanity_checks(PFILE)
#endif
/* This is called after options have been parsed, and partially
processed. */
void
cpp_post_options (cpp_reader *pfile)
{
int flags;
sanity_checks (pfile);
post_options (pfile);
/* Mark named operators before handling command line macros. */
flags = 0;
if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names))
flags |= NODE_OPERATOR;
if (CPP_OPTION (pfile, warn_cxx_operator_names))
flags |= NODE_DIAGNOSTIC | NODE_WARN_OPERATOR;
if (flags != 0)
mark_named_operators (pfile, flags);
}
/* Setup for processing input from the file named FNAME, or stdin if
it is the empty string. Return the original filename on success
(e.g. foo.i->foo.c), or NULL on failure. INJECTING is true if
there may be injected headers before line 1 of the main file. */
const char *
cpp_read_main_file (cpp_reader *pfile, const char *fname, bool injecting)
{
if (mkdeps *deps = cpp_get_deps (pfile))
/* Set the default target (if there is none already). */
deps_add_default_target (deps, fname);
pfile->main_file
= _cpp_find_file (pfile, fname,
CPP_OPTION (pfile, preprocessed) ? &pfile->no_search_path
: CPP_OPTION (pfile, main_search) == CMS_user
? pfile->quote_include
: CPP_OPTION (pfile, main_search) == CMS_system
? pfile->bracket_include : &pfile->no_search_path,
/*angle=*/0, _cpp_FFK_NORMAL, 0);
if (_cpp_find_failed (pfile->main_file))
return NULL;
_cpp_stack_file (pfile, pfile->main_file,
injecting || CPP_OPTION (pfile, preprocessed)
? IT_PRE_MAIN : IT_MAIN, 0);
/* For foo.i, read the original filename foo.c now, for the benefit
of the front ends. */
if (CPP_OPTION (pfile, preprocessed))
if (!read_original_filename (pfile))
{
/* We're on line 1 after all. */
auto *last = linemap_check_ordinary
(LINEMAPS_LAST_MAP (pfile->line_table, false));
last->to_line = 1;
/* Inform of as-if a file change. */
_cpp_do_file_change (pfile, LC_RENAME_VERBATIM, LINEMAP_FILE (last),
LINEMAP_LINE (last), LINEMAP_SYSP (last));
}
auto *map = LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table);
pfile->main_loc = MAP_START_LOCATION (map);
return ORDINARY_MAP_FILE_NAME (map);
}
location_t
cpp_main_loc (const cpp_reader *pfile)
{
return pfile->main_loc;
}
/* For preprocessed files, if the very first characters are
'#<SPACE>[01]<SPACE>', then handle a line directive so we know the
original file name. This will generate file_change callbacks,
which the front ends must handle appropriately given their state of
initialization. We peek directly into the character buffer, so
that we're not confused by otherwise-skipped white space &
comments. We can be very picky, because this should have been
machine-generated text (by us, no less). This way we do not
interfere with the module directive state machine. */
static bool
read_original_filename (cpp_reader *pfile)
{
auto *buf = pfile->buffer->next_line;
if (pfile->buffer->rlimit - buf > 4
&& buf[0] == '#'
&& buf[1] == ' '
// Also permit '1', as that's what used to be here
&& (buf[2] == '0' || buf[2] == '1')
&& buf[3] == ' ')
{
const cpp_token *token = _cpp_lex_direct (pfile);
gcc_checking_assert (token->type == CPP_HASH);
if (_cpp_handle_directive (pfile, token->flags & PREV_WHITE))
{
read_original_directory (pfile);
return true;
}
}
return false;
}
/* For preprocessed files, if the tokens following the first filename
line is of the form # <line> "/path/name//", handle the
directive so we know the original current directory.
As with the first line peeking, we can do this without lexing by
being picky. */
static void
read_original_directory (cpp_reader *pfile)
{
auto *buf = pfile->buffer->next_line;
if (pfile->buffer->rlimit - buf > 4
&& buf[0] == '#'
&& buf[1] == ' '
// Also permit '1', as that's what used to be here
&& (buf[2] == '0' || buf[2] == '1')
&& buf[3] == ' ')
{
const cpp_token *hash = _cpp_lex_direct (pfile);
gcc_checking_assert (hash->type == CPP_HASH);
pfile->state.in_directive = 1;
const cpp_token *number = _cpp_lex_direct (pfile);
gcc_checking_assert (number->type == CPP_NUMBER);
const cpp_token *string = _cpp_lex_direct (pfile);
pfile->state.in_directive = 0;
const unsigned char *text = nullptr;
size_t len = 0;
if (string->type == CPP_STRING)
{
/* The string value includes the quotes. */
text = string->val.str.text;
len = string->val.str.len;
}
if (len < 5
|| !IS_DIR_SEPARATOR (text[len - 2])
|| !IS_DIR_SEPARATOR (text[len - 3]))
{
/* That didn't work out, back out. */
_cpp_backup_tokens (pfile, 3);
return;
}
if (pfile->cb.dir_change)
{
/* Smash the string directly, it's dead at this point */
char *smashy = (char *)text;
smashy[len - 3] = 0;
pfile->cb.dir_change (pfile, smashy + 1);
}
/* We should be at EOL. */
}
}
/* This is called at the end of preprocessing. It pops the last
buffer and writes dependency output.
Maybe it should also reset state, such that you could call
cpp_start_read with a new filename to restart processing. */
void
cpp_finish (cpp_reader *pfile, FILE *deps_stream)
{
/* Warn about unused macros before popping the final buffer. */
if (CPP_OPTION (pfile, warn_unused_macros))
cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL);
/* lex.c leaves the final buffer on the stack. This it so that
it returns an unending stream of CPP_EOFs to the client. If we
popped the buffer, we'd dereference a NULL buffer pointer and
segfault. It's nice to allow the client to do worry-free excess
cpp_get_token calls. */
while (pfile->buffer)
_cpp_pop_buffer (pfile);
if (deps_stream)
deps_write (pfile, deps_stream, 72);
/* Report on headers that could use multiple include guards. */
if (CPP_OPTION (pfile, print_include_names))
_cpp_report_missing_guards (pfile);
}
static void
post_options (cpp_reader *pfile)
{
/* -Wtraditional is not useful in C++ mode. */
if (CPP_OPTION (pfile, cplusplus))
CPP_OPTION (pfile, cpp_warn_traditional) = 0;
/* Permanently disable macro expansion if we are rescanning
preprocessed text. Read preprocesed source in ISO mode. */
if (CPP_OPTION (pfile, preprocessed))
{
if (!CPP_OPTION (pfile, directives_only))
pfile->state.prevent_expansion = 1;
CPP_OPTION (pfile, traditional) = 0;
}
if (CPP_OPTION (pfile, warn_trigraphs) == 2)
CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs);
if (CPP_OPTION (pfile, traditional))
{
CPP_OPTION (pfile, trigraphs) = 0;
CPP_OPTION (pfile, warn_trigraphs) = 0;
}
if (CPP_OPTION (pfile, module_directives))
{
/* These unspellable tokens have a leading space. */
const char *const inits[spec_nodes::M_HWM]
= {"export ", "module ", "import ", "__import"};
for (int ix = 0; ix != spec_nodes::M_HWM; ix++)
{
cpp_hashnode *node = cpp_lookup (pfile, UC (inits[ix]),
strlen (inits[ix]));
/* Token we pass to the compiler. */
pfile->spec_nodes.n_modules[ix][1] = node;
if (ix != spec_nodes::M__IMPORT)
/* Token we recognize when lexing, drop the trailing ' '. */
node = cpp_lookup (pfile, NODE_NAME (node), NODE_LEN (node) - 1);
node->flags |= NODE_MODULE;
pfile->spec_nodes.n_modules[ix][0] = node;
}
}
}
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