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gcc/libcpp/init.c
Joseph Myers 7c5890cc0a Support UTF-8 character constants for C2x. 
C2x adds u8'' character constants to C.  This patch adds the
corresponding GCC support.

Most of the support was already present for C++ and just needed
enabling for C2x.  However, in C2x these constants have type unsigned
char, which required corresponding adjustments in the compiler and the
preprocessor to give them that type for C.

For C, it seems clear to me that having type unsigned char means the
constants are unsigned in the preprocessor (and thus treated as having
type uintmax_t in #if conditionals), so this patch implements that.  I
included a conditional in the libcpp change to avoid affecting
signedness for C++, but I'm not sure if in fact these constants should
also be unsigned in the preprocessor for C++ in which case that
!CPP_OPTION (pfile, cplusplus) conditional would not be needed.

Bootstrapped with no regressions on x86_64-pc-linux-gnu.

gcc/c:
	* c-parser.c (c_parser_postfix_expression)
	(c_parser_check_literal_zero): Handle CPP_UTF8CHAR.
	* gimple-parser.c (c_parser_gimple_postfix_expression): Likewise.

gcc/c-family:
	* c-lex.c (lex_charconst): Make CPP_UTF8CHAR constants unsigned
	char for C.

gcc/testsuite:
	* gcc.dg/c11-utf8char-1.c, gcc.dg/c2x-utf8char-1.c,
	gcc.dg/c2x-utf8char-2.c, gcc.dg/c2x-utf8char-3.c,
	gcc.dg/gnu2x-utf8char-1.c: New tests.

libcpp:
	* charset.c (narrow_str_to_charconst): Make CPP_UTF8CHAR constants
	unsigned for C.
	* init.c (lang_defaults): Set utf8_char_literals for GNUC2X and
	STDC2X.

From-SVN: r278265
2019-11-14 20:18:33 +00:00

828 lines
27 KiB
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/* CPP Library.
Copyright (C) 1986-2019 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 void 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, 0, 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, 0, 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 },
/* GNUCXX2A */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
/* CXX2A */ { 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, tabstop) = 8;
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->eof.type = CPP_EOF;
pfile->eof.flags = 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;
/* Initialize source_date_epoch to -2 (not yet set). */
pfile->source_date_epoch = (time_t) -2;
/* 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),
B("__has_attribute", BT_HAS_ATTRIBUTE, true),
B("__has_cpp_attribute", BT_HAS_ATTRIBUTE, true),
B("__has_builtin", BT_HAS_BUILTIN, 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_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_CXX2A
|| CPP_OPTION (pfile, lang) == CLK_GNUCXX2A)
_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. */
const char *
cpp_read_main_file (cpp_reader *pfile, const char *fname)
{
const location_t loc = 0;
if (CPP_OPTION (pfile, deps.style) != DEPS_NONE)
{
if (!pfile->deps)
pfile->deps = deps_init ();
/* Set the default target (if there is none already). */
deps_add_default_target (pfile->deps, fname);
}
pfile->main_file
= _cpp_find_file (pfile, fname, &pfile->no_search_path, false, 0, false,
loc);
if (_cpp_find_failed (pfile->main_file))
return NULL;
_cpp_stack_file (pfile, pfile->main_file, 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))
{
read_original_filename (pfile);
fname =
ORDINARY_MAP_FILE_NAME
((LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table)));
}
return fname;
}
/* For preprocessed files, if the first tokens are of the form # NUM.
handle the 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. */
static void
read_original_filename (cpp_reader *pfile)
{
const cpp_token *token, *token1;
/* Lex ahead; if the first tokens are of the form # NUM, then
process the directive, otherwise back up. */
token = _cpp_lex_direct (pfile);
if (token->type == CPP_HASH)
{
pfile->state.in_directive = 1;
token1 = _cpp_lex_direct (pfile);
_cpp_backup_tokens (pfile, 1);
pfile->state.in_directive = 0;
/* If it's a #line directive, handle it. */
if (token1->type == CPP_NUMBER
&& _cpp_handle_directive (pfile, token->flags & PREV_WHITE))
{
read_original_directory (pfile);
return;
}
}
/* Backup as if nothing happened. */
_cpp_backup_tokens (pfile, 1);
}
/* 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. */
static void
read_original_directory (cpp_reader *pfile)
{
const cpp_token *hash, *token;
/* Lex ahead; if the first tokens are of the form # NUM, then
process the directive, otherwise back up. */
hash = _cpp_lex_direct (pfile);
if (hash->type != CPP_HASH)
{
_cpp_backup_tokens (pfile, 1);
return;
}
token = _cpp_lex_direct (pfile);
if (token->type != CPP_NUMBER)
{
_cpp_backup_tokens (pfile, 2);
return;
}
token = _cpp_lex_direct (pfile);
if (token->type != CPP_STRING
|| ! (token->val.str.len >= 5
&& IS_DIR_SEPARATOR (token->val.str.text[token->val.str.len-2])
&& IS_DIR_SEPARATOR (token->val.str.text[token->val.str.len-3])))
{
_cpp_backup_tokens (pfile, 3);
return;
}
if (pfile->cb.dir_change)
{
char *debugdir = (char *) alloca (token->val.str.len - 3);
memcpy (debugdir, (const char *) token->val.str.text + 1,
token->val.str.len - 4);
debugdir[token->val.str.len - 4] = '\0';
pfile->cb.dir_change (pfile, debugdir);
}
}
/* 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 (CPP_OPTION (pfile, deps.style) != DEPS_NONE && deps_stream)
deps_write (pfile->deps, deps_stream,
CPP_OPTION (pfile, deps.phony_targets), 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;
}
}
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