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freebsd/contrib/gcc/c-lex.c
David E. O'Brien 1952e2e1c1 Enlist the FreeBSD-CURRENT users as testers of what is to become Gcc 3.1.0. 
These bits are taken from the FSF anoncvs repo on 1-Feb-2002 08:20 PST.
2002-02-01 18:16:02 +00:00

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/* Lexical analyzer for C and Objective C.
Copyright (C) 1987, 1988, 1989, 1992, 1994, 1995, 1996, 1997
1998, 1999, 2000 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include "config.h"
#include "system.h"
#include "rtl.h"
#include "tree.h"
#include "expr.h"
#include "input.h"
#include "output.h"
#include "c-lex.h"
#include "c-tree.h"
#include "flags.h"
#include "timevar.h"
#include "cpplib.h"
#include "c-pragma.h"
#include "toplev.h"
#include "intl.h"
#include "tm_p.h"
#include "splay-tree.h"
#include "debug.h"
/* MULTIBYTE_CHARS support only works for native compilers.
??? Ideally what we want is to model widechar support after
the current floating point support. */
#ifdef CROSS_COMPILE
#undef MULTIBYTE_CHARS
#endif
#ifdef MULTIBYTE_CHARS
#include "mbchar.h"
#include <locale.h>
#endif /* MULTIBYTE_CHARS */
#ifndef GET_ENVIRONMENT
#define GET_ENVIRONMENT(ENV_VALUE,ENV_NAME) ((ENV_VALUE) = getenv (ENV_NAME))
#endif
/* The current line map. */
static const struct line_map *map;
/* The line used to refresh the lineno global variable after each token. */
static unsigned int src_lineno;
/* We may keep statistics about how long which files took to compile. */
static int header_time, body_time;
static splay_tree file_info_tree;
/* Cause the `yydebug' variable to be defined. */
#define YYDEBUG 1
/* File used for outputting assembler code. */
extern FILE *asm_out_file;
#undef WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE TYPE_PRECISION (wchar_type_node)
/* Number of bytes in a wide character. */
#define WCHAR_BYTES (WCHAR_TYPE_SIZE / BITS_PER_UNIT)
int indent_level; /* Number of { minus number of }. */
int pending_lang_change; /* If we need to switch languages - C++ only */
int c_header_level; /* depth in C headers - C++ only */
/* Nonzero tells yylex to ignore \ in string constants. */
static int ignore_escape_flag;
static void parse_float PARAMS ((PTR));
static tree lex_number PARAMS ((const char *, unsigned int));
static tree lex_string PARAMS ((const char *, unsigned int, int));
static tree lex_charconst PARAMS ((const cpp_token *));
static void update_header_times PARAMS ((const char *));
static int dump_one_header PARAMS ((splay_tree_node, void *));
static void cb_line_change PARAMS ((cpp_reader *, const cpp_token *, int));
static void cb_ident PARAMS ((cpp_reader *, unsigned int,
const cpp_string *));
static void cb_file_change PARAMS ((cpp_reader *, const struct line_map *));
static void cb_def_pragma PARAMS ((cpp_reader *, unsigned int));
static void cb_define PARAMS ((cpp_reader *, unsigned int,
cpp_hashnode *));
static void cb_undef PARAMS ((cpp_reader *, unsigned int,
cpp_hashnode *));
const char *
init_c_lex (filename)
const char *filename;
{
struct cpp_callbacks *cb;
struct c_fileinfo *toplevel;
/* Set up filename timing. Must happen before cpp_read_main_file. */
file_info_tree = splay_tree_new ((splay_tree_compare_fn)strcmp,
0,
(splay_tree_delete_value_fn)free);
toplevel = get_fileinfo ("<top level>");
if (flag_detailed_statistics)
{
header_time = 0;
body_time = get_run_time ();
toplevel->time = body_time;
}
#ifdef MULTIBYTE_CHARS
/* Change to the native locale for multibyte conversions. */
setlocale (LC_CTYPE, "");
GET_ENVIRONMENT (literal_codeset, "LANG");
#endif
cb = cpp_get_callbacks (parse_in);
cb->line_change = cb_line_change;
cb->ident = cb_ident;
cb->file_change = cb_file_change;
cb->def_pragma = cb_def_pragma;
/* Set the debug callbacks if we can use them. */
if (debug_info_level == DINFO_LEVEL_VERBOSE
&& (write_symbols == DWARF_DEBUG || write_symbols == DWARF2_DEBUG
|| write_symbols == VMS_AND_DWARF2_DEBUG))
{
cb->define = cb_define;
cb->undef = cb_undef;
}
/* Start it at 0. */
lineno = 0;
if (filename == NULL || !strcmp (filename, "-"))
filename = "";
return cpp_read_main_file (parse_in, filename, ident_hash);
}
/* A thin wrapper around the real parser that initializes the
integrated preprocessor after debug output has been initialized.
Also, make sure the start_source_file debug hook gets called for
the primary source file. */
int
yyparse()
{
(*debug_hooks->start_source_file) (lineno, input_filename);
cpp_finish_options (parse_in);
return yyparse_1();
}
struct c_fileinfo *
get_fileinfo (name)
const char *name;
{
splay_tree_node n;
struct c_fileinfo *fi;
n = splay_tree_lookup (file_info_tree, (splay_tree_key) name);
if (n)
return (struct c_fileinfo *) n->value;
fi = (struct c_fileinfo *) xmalloc (sizeof (struct c_fileinfo));
fi->time = 0;
fi->interface_only = 0;
fi->interface_unknown = 1;
splay_tree_insert (file_info_tree, (splay_tree_key) name,
(splay_tree_value) fi);
return fi;
}
static void
update_header_times (name)
const char *name;
{
/* Changing files again. This means currently collected time
is charged against header time, and body time starts back at 0. */
if (flag_detailed_statistics)
{
int this_time = get_run_time ();
struct c_fileinfo *file = get_fileinfo (name);
header_time += this_time - body_time;
file->time += this_time - body_time;
body_time = this_time;
}
}
static int
dump_one_header (n, dummy)
splay_tree_node n;
void *dummy ATTRIBUTE_UNUSED;
{
print_time ((const char *) n->key,
((struct c_fileinfo *) n->value)->time);
return 0;
}
void
dump_time_statistics ()
{
struct c_fileinfo *file = get_fileinfo (input_filename);
int this_time = get_run_time ();
file->time += this_time - body_time;
fprintf (stderr, "\n******\n");
print_time ("header files (total)", header_time);
print_time ("main file (total)", this_time - body_time);
fprintf (stderr, "ratio = %g : 1\n",
(double)header_time / (double)(this_time - body_time));
fprintf (stderr, "\n******\n");
splay_tree_foreach (file_info_tree, dump_one_header, 0);
}
/* Not yet handled: #pragma, #define, #undef.
No need to deal with linemarkers under normal conditions. */
static void
cb_ident (pfile, line, str)
cpp_reader *pfile ATTRIBUTE_UNUSED;
unsigned int line ATTRIBUTE_UNUSED;
const cpp_string *str ATTRIBUTE_UNUSED;
{
#ifdef ASM_OUTPUT_IDENT
if (! flag_no_ident)
{
/* Convert escapes in the string. */
tree value = lex_string ((const char *)str->text, str->len, 0);
ASM_OUTPUT_IDENT (asm_out_file, TREE_STRING_POINTER (value));
}
#endif
}
/* Called at the start of every non-empty line. TOKEN is the first
lexed token on the line. Used for diagnostic line numbers. */
static void
cb_line_change (pfile, token, parsing_args)
cpp_reader *pfile ATTRIBUTE_UNUSED;
const cpp_token *token;
int parsing_args ATTRIBUTE_UNUSED;
{
src_lineno = SOURCE_LINE (map, token->line);
}
static void
cb_file_change (pfile, new_map)
cpp_reader *pfile ATTRIBUTE_UNUSED;
const struct line_map *new_map;
{
unsigned int to_line = SOURCE_LINE (new_map, new_map->to_line);
if (new_map->reason == LC_ENTER)
{
/* Don't stack the main buffer on the input stack;
we already did in compile_file. */
if (map == NULL)
main_input_filename = new_map->to_file;
else
{
lineno = SOURCE_LINE (new_map - 1, new_map->from_line - 1);
push_srcloc (new_map->to_file, 1);
input_file_stack->indent_level = indent_level;
(*debug_hooks->start_source_file) (lineno, new_map->to_file);
#ifndef NO_IMPLICIT_EXTERN_C
if (c_header_level)
++c_header_level;
else if (new_map->sysp == 2)
{
c_header_level = 1;
++pending_lang_change;
}
#endif
}
}
else if (new_map->reason == LC_LEAVE)
{
#ifndef NO_IMPLICIT_EXTERN_C
if (c_header_level && --c_header_level == 0)
{
if (new_map->sysp == 2)
warning ("badly nested C headers from preprocessor");
--pending_lang_change;
}
#endif
#if 0
if (indent_level != input_file_stack->indent_level)
{
warning_with_file_and_line
(input_filename, lineno,
"this file contains more '%c's than '%c's",
indent_level > input_file_stack->indent_level ? '{' : '}',
indent_level > input_file_stack->indent_level ? '}' : '{');
}
#endif
pop_srcloc ();
(*debug_hooks->end_source_file) (to_line);
}
update_header_times (new_map->to_file);
in_system_header = new_map->sysp != 0;
input_filename = new_map->to_file;
lineno = to_line;
map = new_map;
/* Hook for C++. */
extract_interface_info ();
}
static void
cb_def_pragma (pfile, line)
cpp_reader *pfile;
unsigned int line;
{
/* Issue a warning message if we have been asked to do so. Ignore
unknown pragmas in system headers unless an explicit
-Wunknown-pragmas has been given. */
if (warn_unknown_pragmas > in_system_header)
{
const unsigned char *space, *name = 0;
const cpp_token *s;
s = cpp_get_token (pfile);
space = cpp_token_as_text (pfile, s);
s = cpp_get_token (pfile);
if (s->type == CPP_NAME)
name = cpp_token_as_text (pfile, s);
lineno = SOURCE_LINE (map, line);
if (name)
warning ("ignoring #pragma %s %s", space, name);
else
warning ("ignoring #pragma %s", space);
}
}
/* #define callback for DWARF and DWARF2 debug info. */
static void
cb_define (pfile, line, node)
cpp_reader *pfile;
unsigned int line;
cpp_hashnode *node;
{
(*debug_hooks->define) (SOURCE_LINE (map, line),
(const char *) cpp_macro_definition (pfile, node));
}
/* #undef callback for DWARF and DWARF2 debug info. */
static void
cb_undef (pfile, line, node)
cpp_reader *pfile ATTRIBUTE_UNUSED;
unsigned int line;
cpp_hashnode *node;
{
(*debug_hooks->undef) (SOURCE_LINE (map, line),
(const char *) NODE_NAME (node));
}
#if 0 /* not yet */
/* Returns nonzero if C is a universal-character-name. Give an error if it
is not one which may appear in an identifier, as per [extendid].
Note that extended character support in identifiers has not yet been
implemented. It is my personal opinion that this is not a desirable
feature. Portable code cannot count on support for more than the basic
identifier character set. */
static inline int
is_extended_char (c)
int c;
{
#ifdef TARGET_EBCDIC
return 0;
#else
/* ASCII. */
if (c < 0x7f)
return 0;
/* None of the valid chars are outside the Basic Multilingual Plane (the
low 16 bits). */
if (c > 0xffff)
{
error ("universal-character-name '\\U%08x' not valid in identifier", c);
return 1;
}
/* Latin */
if ((c >= 0x00c0 && c <= 0x00d6)
|| (c >= 0x00d8 && c <= 0x00f6)
|| (c >= 0x00f8 && c <= 0x01f5)
|| (c >= 0x01fa && c <= 0x0217)
|| (c >= 0x0250 && c <= 0x02a8)
|| (c >= 0x1e00 && c <= 0x1e9a)
|| (c >= 0x1ea0 && c <= 0x1ef9))
return 1;
/* Greek */
if ((c == 0x0384)
|| (c >= 0x0388 && c <= 0x038a)
|| (c == 0x038c)
|| (c >= 0x038e && c <= 0x03a1)
|| (c >= 0x03a3 && c <= 0x03ce)
|| (c >= 0x03d0 && c <= 0x03d6)
|| (c == 0x03da)
|| (c == 0x03dc)
|| (c == 0x03de)
|| (c == 0x03e0)
|| (c >= 0x03e2 && c <= 0x03f3)
|| (c >= 0x1f00 && c <= 0x1f15)
|| (c >= 0x1f18 && c <= 0x1f1d)
|| (c >= 0x1f20 && c <= 0x1f45)
|| (c >= 0x1f48 && c <= 0x1f4d)
|| (c >= 0x1f50 && c <= 0x1f57)
|| (c == 0x1f59)
|| (c == 0x1f5b)
|| (c == 0x1f5d)
|| (c >= 0x1f5f && c <= 0x1f7d)
|| (c >= 0x1f80 && c <= 0x1fb4)
|| (c >= 0x1fb6 && c <= 0x1fbc)
|| (c >= 0x1fc2 && c <= 0x1fc4)
|| (c >= 0x1fc6 && c <= 0x1fcc)
|| (c >= 0x1fd0 && c <= 0x1fd3)
|| (c >= 0x1fd6 && c <= 0x1fdb)
|| (c >= 0x1fe0 && c <= 0x1fec)
|| (c >= 0x1ff2 && c <= 0x1ff4)
|| (c >= 0x1ff6 && c <= 0x1ffc))
return 1;
/* Cyrillic */
if ((c >= 0x0401 && c <= 0x040d)
|| (c >= 0x040f && c <= 0x044f)
|| (c >= 0x0451 && c <= 0x045c)
|| (c >= 0x045e && c <= 0x0481)
|| (c >= 0x0490 && c <= 0x04c4)
|| (c >= 0x04c7 && c <= 0x04c8)
|| (c >= 0x04cb && c <= 0x04cc)
|| (c >= 0x04d0 && c <= 0x04eb)
|| (c >= 0x04ee && c <= 0x04f5)
|| (c >= 0x04f8 && c <= 0x04f9))
return 1;
/* Armenian */
if ((c >= 0x0531 && c <= 0x0556)
|| (c >= 0x0561 && c <= 0x0587))
return 1;
/* Hebrew */
if ((c >= 0x05d0 && c <= 0x05ea)
|| (c >= 0x05f0 && c <= 0x05f4))
return 1;
/* Arabic */
if ((c >= 0x0621 && c <= 0x063a)
|| (c >= 0x0640 && c <= 0x0652)
|| (c >= 0x0670 && c <= 0x06b7)
|| (c >= 0x06ba && c <= 0x06be)
|| (c >= 0x06c0 && c <= 0x06ce)
|| (c >= 0x06e5 && c <= 0x06e7))
return 1;
/* Devanagari */
if ((c >= 0x0905 && c <= 0x0939)
|| (c >= 0x0958 && c <= 0x0962))
return 1;
/* Bengali */
if ((c >= 0x0985 && c <= 0x098c)
|| (c >= 0x098f && c <= 0x0990)
|| (c >= 0x0993 && c <= 0x09a8)
|| (c >= 0x09aa && c <= 0x09b0)
|| (c == 0x09b2)
|| (c >= 0x09b6 && c <= 0x09b9)
|| (c >= 0x09dc && c <= 0x09dd)
|| (c >= 0x09df && c <= 0x09e1)
|| (c >= 0x09f0 && c <= 0x09f1))
return 1;
/* Gurmukhi */
if ((c >= 0x0a05 && c <= 0x0a0a)
|| (c >= 0x0a0f && c <= 0x0a10)
|| (c >= 0x0a13 && c <= 0x0a28)
|| (c >= 0x0a2a && c <= 0x0a30)
|| (c >= 0x0a32 && c <= 0x0a33)
|| (c >= 0x0a35 && c <= 0x0a36)
|| (c >= 0x0a38 && c <= 0x0a39)
|| (c >= 0x0a59 && c <= 0x0a5c)
|| (c == 0x0a5e))
return 1;
/* Gujarati */
if ((c >= 0x0a85 && c <= 0x0a8b)
|| (c == 0x0a8d)
|| (c >= 0x0a8f && c <= 0x0a91)
|| (c >= 0x0a93 && c <= 0x0aa8)
|| (c >= 0x0aaa && c <= 0x0ab0)
|| (c >= 0x0ab2 && c <= 0x0ab3)
|| (c >= 0x0ab5 && c <= 0x0ab9)
|| (c == 0x0ae0))
return 1;
/* Oriya */
if ((c >= 0x0b05 && c <= 0x0b0c)
|| (c >= 0x0b0f && c <= 0x0b10)
|| (c >= 0x0b13 && c <= 0x0b28)
|| (c >= 0x0b2a && c <= 0x0b30)
|| (c >= 0x0b32 && c <= 0x0b33)
|| (c >= 0x0b36 && c <= 0x0b39)
|| (c >= 0x0b5c && c <= 0x0b5d)
|| (c >= 0x0b5f && c <= 0x0b61))
return 1;
/* Tamil */
if ((c >= 0x0b85 && c <= 0x0b8a)
|| (c >= 0x0b8e && c <= 0x0b90)
|| (c >= 0x0b92 && c <= 0x0b95)
|| (c >= 0x0b99 && c <= 0x0b9a)
|| (c == 0x0b9c)
|| (c >= 0x0b9e && c <= 0x0b9f)
|| (c >= 0x0ba3 && c <= 0x0ba4)
|| (c >= 0x0ba8 && c <= 0x0baa)
|| (c >= 0x0bae && c <= 0x0bb5)
|| (c >= 0x0bb7 && c <= 0x0bb9))
return 1;
/* Telugu */
if ((c >= 0x0c05 && c <= 0x0c0c)
|| (c >= 0x0c0e && c <= 0x0c10)
|| (c >= 0x0c12 && c <= 0x0c28)
|| (c >= 0x0c2a && c <= 0x0c33)
|| (c >= 0x0c35 && c <= 0x0c39)
|| (c >= 0x0c60 && c <= 0x0c61))
return 1;
/* Kannada */
if ((c >= 0x0c85 && c <= 0x0c8c)
|| (c >= 0x0c8e && c <= 0x0c90)
|| (c >= 0x0c92 && c <= 0x0ca8)
|| (c >= 0x0caa && c <= 0x0cb3)
|| (c >= 0x0cb5 && c <= 0x0cb9)
|| (c >= 0x0ce0 && c <= 0x0ce1))
return 1;
/* Malayalam */
if ((c >= 0x0d05 && c <= 0x0d0c)
|| (c >= 0x0d0e && c <= 0x0d10)
|| (c >= 0x0d12 && c <= 0x0d28)
|| (c >= 0x0d2a && c <= 0x0d39)
|| (c >= 0x0d60 && c <= 0x0d61))
return 1;
/* Thai */
if ((c >= 0x0e01 && c <= 0x0e30)
|| (c >= 0x0e32 && c <= 0x0e33)
|| (c >= 0x0e40 && c <= 0x0e46)
|| (c >= 0x0e4f && c <= 0x0e5b))
return 1;
/* Lao */
if ((c >= 0x0e81 && c <= 0x0e82)
|| (c == 0x0e84)
|| (c == 0x0e87)
|| (c == 0x0e88)
|| (c == 0x0e8a)
|| (c == 0x0e0d)
|| (c >= 0x0e94 && c <= 0x0e97)
|| (c >= 0x0e99 && c <= 0x0e9f)
|| (c >= 0x0ea1 && c <= 0x0ea3)
|| (c == 0x0ea5)
|| (c == 0x0ea7)
|| (c == 0x0eaa)
|| (c == 0x0eab)
|| (c >= 0x0ead && c <= 0x0eb0)
|| (c == 0x0eb2)
|| (c == 0x0eb3)
|| (c == 0x0ebd)
|| (c >= 0x0ec0 && c <= 0x0ec4)
|| (c == 0x0ec6))
return 1;
/* Georgian */
if ((c >= 0x10a0 && c <= 0x10c5)
|| (c >= 0x10d0 && c <= 0x10f6))
return 1;
/* Hiragana */
if ((c >= 0x3041 && c <= 0x3094)
|| (c >= 0x309b && c <= 0x309e))
return 1;
/* Katakana */
if ((c >= 0x30a1 && c <= 0x30fe))
return 1;
/* Bopmofo */
if ((c >= 0x3105 && c <= 0x312c))
return 1;
/* Hangul */
if ((c >= 0x1100 && c <= 0x1159)
|| (c >= 0x1161 && c <= 0x11a2)
|| (c >= 0x11a8 && c <= 0x11f9))
return 1;
/* CJK Unified Ideographs */
if ((c >= 0xf900 && c <= 0xfa2d)
|| (c >= 0xfb1f && c <= 0xfb36)
|| (c >= 0xfb38 && c <= 0xfb3c)
|| (c == 0xfb3e)
|| (c >= 0xfb40 && c <= 0xfb41)
|| (c >= 0xfb42 && c <= 0xfb44)
|| (c >= 0xfb46 && c <= 0xfbb1)
|| (c >= 0xfbd3 && c <= 0xfd3f)
|| (c >= 0xfd50 && c <= 0xfd8f)
|| (c >= 0xfd92 && c <= 0xfdc7)
|| (c >= 0xfdf0 && c <= 0xfdfb)
|| (c >= 0xfe70 && c <= 0xfe72)
|| (c == 0xfe74)
|| (c >= 0xfe76 && c <= 0xfefc)
|| (c >= 0xff21 && c <= 0xff3a)
|| (c >= 0xff41 && c <= 0xff5a)
|| (c >= 0xff66 && c <= 0xffbe)
|| (c >= 0xffc2 && c <= 0xffc7)
|| (c >= 0xffca && c <= 0xffcf)
|| (c >= 0xffd2 && c <= 0xffd7)
|| (c >= 0xffda && c <= 0xffdc)
|| (c >= 0x4e00 && c <= 0x9fa5))
return 1;
error ("universal-character-name '\\u%04x' not valid in identifier", c);
return 1;
#endif
}
/* Add the UTF-8 representation of C to the token_buffer. */
static void
utf8_extend_token (c)
int c;
{
int shift, mask;
if (c <= 0x0000007f)
{
extend_token (c);
return;
}
else if (c <= 0x000007ff)
shift = 6, mask = 0xc0;
else if (c <= 0x0000ffff)
shift = 12, mask = 0xe0;
else if (c <= 0x001fffff)
shift = 18, mask = 0xf0;
else if (c <= 0x03ffffff)
shift = 24, mask = 0xf8;
else
shift = 30, mask = 0xfc;
extend_token (mask | (c >> shift));
do
{
shift -= 6;
extend_token ((unsigned char) (0x80 | (c >> shift)));
}
while (shift);
}
#endif
#if 0
struct try_type
{
tree *const node_var;
const char unsigned_flag;
const char long_flag;
const char long_long_flag;
};
struct try_type type_sequence[] =
{
{ &integer_type_node, 0, 0, 0},
{ &unsigned_type_node, 1, 0, 0},
{ &long_integer_type_node, 0, 1, 0},
{ &long_unsigned_type_node, 1, 1, 0},
{ &long_long_integer_type_node, 0, 1, 1},
{ &long_long_unsigned_type_node, 1, 1, 1}
};
#endif /* 0 */
struct pf_args
{
/* Input */
const char *str;
int fflag;
int lflag;
int base;
/* Output */
int conversion_errno;
REAL_VALUE_TYPE value;
tree type;
};
static void
parse_float (data)
PTR data;
{
struct pf_args * args = (struct pf_args *) data;
const char *typename;
args->conversion_errno = 0;
args->type = double_type_node;
typename = "double";
/* The second argument, machine_mode, of REAL_VALUE_ATOF
tells the desired precision of the binary result
of decimal-to-binary conversion. */
if (args->fflag)
{
if (args->lflag)
error ("both 'f' and 'l' suffixes on floating constant");
args->type = float_type_node;
typename = "float";
}
else if (args->lflag)
{
args->type = long_double_type_node;
typename = "long double";
}
else if (flag_single_precision_constant)
{
args->type = float_type_node;
typename = "float";
}
errno = 0;
if (args->base == 16)
args->value = REAL_VALUE_HTOF (args->str, TYPE_MODE (args->type));
else
args->value = REAL_VALUE_ATOF (args->str, TYPE_MODE (args->type));
args->conversion_errno = errno;
/* A diagnostic is required here by some ISO C testsuites.
This is not pedwarn, because some people don't want
an error for this. */
if (REAL_VALUE_ISINF (args->value) && pedantic)
warning ("floating point number exceeds range of '%s'", typename);
}
int
c_lex (value)
tree *value;
{
const cpp_token *tok;
retry:
timevar_push (TV_CPP);
do
tok = cpp_get_token (parse_in);
while (tok->type == CPP_PADDING);
timevar_pop (TV_CPP);
/* The C++ front end does horrible things with the current line
number. To ensure an accurate line number, we must reset it
every time we return a token. */
lineno = src_lineno;
*value = NULL_TREE;
switch (tok->type)
{
case CPP_OPEN_BRACE: indent_level++; break;
case CPP_CLOSE_BRACE: indent_level--; break;
/* Issue this error here, where we can get at tok->val.c. */
case CPP_OTHER:
if (ISGRAPH (tok->val.c))
error ("stray '%c' in program", tok->val.c);
else
error ("stray '\\%o' in program", tok->val.c);
goto retry;
case CPP_NAME:
*value = HT_IDENT_TO_GCC_IDENT (HT_NODE (tok->val.node));
break;
case CPP_NUMBER:
*value = lex_number ((const char *)tok->val.str.text, tok->val.str.len);
break;
case CPP_CHAR:
case CPP_WCHAR:
*value = lex_charconst (tok);
break;
case CPP_STRING:
case CPP_WSTRING:
*value = lex_string ((const char *)tok->val.str.text,
tok->val.str.len, tok->type == CPP_WSTRING);
break;
/* These tokens should not be visible outside cpplib. */
case CPP_HEADER_NAME:
case CPP_COMMENT:
case CPP_MACRO_ARG:
abort ();
default: break;
}
return tok->type;
}
#define ERROR(msgid) do { error(msgid); goto syntax_error; } while(0)
static tree
lex_number (str, len)
const char *str;
unsigned int len;
{
int base = 10;
int count = 0;
int largest_digit = 0;
int numdigits = 0;
int overflow = 0;
int c;
tree value;
const char *p;
enum anon1 { NOT_FLOAT = 0, AFTER_POINT, AFTER_EXPON } floatflag = NOT_FLOAT;
/* We actually store only HOST_BITS_PER_CHAR bits in each part.
The code below which fills the parts array assumes that a host
int is at least twice as wide as a host char, and that
HOST_BITS_PER_WIDE_INT is an even multiple of HOST_BITS_PER_CHAR.
Two HOST_WIDE_INTs is the largest int literal we can store.
In order to detect overflow below, the number of parts (TOTAL_PARTS)
must be exactly the number of parts needed to hold the bits
of two HOST_WIDE_INTs. */
#define TOTAL_PARTS ((HOST_BITS_PER_WIDE_INT / HOST_BITS_PER_CHAR) * 2)
unsigned int parts[TOTAL_PARTS];
/* Optimize for most frequent case. */
if (len == 1)
{
if (*str == '0')
return integer_zero_node;
else if (*str == '1')
return integer_one_node;
else
return build_int_2 (*str - '0', 0);
}
for (count = 0; count < TOTAL_PARTS; count++)
parts[count] = 0;
/* len is known to be >1 at this point. */
p = str;
if (len > 2 && str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
{
base = 16;
p = str + 2;
}
/* The ISDIGIT check is so we are not confused by a suffix on 0. */
else if (str[0] == '0' && ISDIGIT (str[1]))
{
base = 8;
p = str + 1;
}
do
{
c = *p++;
if (c == '.')
{
if (floatflag == AFTER_POINT)
ERROR ("too many decimal points in floating constant");
else if (floatflag == AFTER_EXPON)
ERROR ("decimal point in exponent - impossible!");
else
floatflag = AFTER_POINT;
if (base == 8)
base = 10;
}
else if (c == '_')
/* Possible future extension: silently ignore _ in numbers,
permitting cosmetic grouping - e.g. 0x8000_0000 == 0x80000000
but somewhat easier to read. Ada has this? */
ERROR ("underscore in number");
else
{
int n;
/* It is not a decimal point.
It should be a digit (perhaps a hex digit). */
if (ISDIGIT (c)
|| (base == 16 && ISXDIGIT (c)))
{
n = hex_value (c);
}
else if (base <= 10 && (c == 'e' || c == 'E'))
{
base = 10;
floatflag = AFTER_EXPON;
break;
}
else if (base == 16 && (c == 'p' || c == 'P'))
{
floatflag = AFTER_EXPON;
break; /* start of exponent */
}
else
{
p--;
break; /* start of suffix */
}
if (n >= largest_digit)
largest_digit = n;
numdigits++;
for (count = 0; count < TOTAL_PARTS; count++)
{
parts[count] *= base;
if (count)
{
parts[count]
+= (parts[count-1] >> HOST_BITS_PER_CHAR);
parts[count-1]
&= (1 << HOST_BITS_PER_CHAR) - 1;
}
else
parts[0] += n;
}
/* If the highest-order part overflows (gets larger than
a host char will hold) then the whole number has
overflowed. Record this and truncate the highest-order
part. */
if (parts[TOTAL_PARTS - 1] >> HOST_BITS_PER_CHAR)
{
overflow = 1;
parts[TOTAL_PARTS - 1] &= (1 << HOST_BITS_PER_CHAR) - 1;
}
}
}
while (p < str + len);
/* This can happen on input like `int i = 0x;' */
if (numdigits == 0)
ERROR ("numeric constant with no digits");
if (largest_digit >= base)
ERROR ("numeric constant contains digits beyond the radix");
if (floatflag != NOT_FLOAT)
{
tree type;
int imag, fflag, lflag, conversion_errno;
REAL_VALUE_TYPE real;
struct pf_args args;
char *copy;
if (base == 16 && pedantic && !flag_isoc99)
pedwarn ("floating constant may not be in radix 16");
if (base == 16 && floatflag != AFTER_EXPON)
ERROR ("hexadecimal floating constant has no exponent");
/* Read explicit exponent if any, and put it in tokenbuf. */
if ((base == 10 && ((c == 'e') || (c == 'E')))
|| (base == 16 && (c == 'p' || c == 'P')))
{
if (p < str + len)
c = *p++;
if (p < str + len && (c == '+' || c == '-'))
c = *p++;
/* Exponent is decimal, even if string is a hex float. */
if (! ISDIGIT (c))
ERROR ("floating constant exponent has no digits");
while (p < str + len && ISDIGIT (c))
c = *p++;
if (! ISDIGIT (c))
p--;
}
/* Copy the float constant now; we don't want any suffixes in the
string passed to parse_float. */
copy = alloca (p - str + 1);
memcpy (copy, str, p - str);
copy[p - str] = '\0';
/* Now parse suffixes. */
fflag = lflag = imag = 0;
while (p < str + len)
switch (*p++)
{
case 'f': case 'F':
if (fflag)
ERROR ("more than one 'f' suffix on floating constant");
else if (warn_traditional && !in_system_header
&& ! cpp_sys_macro_p (parse_in))
warning ("traditional C rejects the 'f' suffix");
fflag = 1;
break;
case 'l': case 'L':
if (lflag)
ERROR ("more than one 'l' suffix on floating constant");
else if (warn_traditional && !in_system_header
&& ! cpp_sys_macro_p (parse_in))
warning ("traditional C rejects the 'l' suffix");
lflag = 1;
break;
case 'i': case 'I':
case 'j': case 'J':
if (imag)
ERROR ("more than one 'i' or 'j' suffix on floating constant");
else if (pedantic)
pedwarn ("ISO C forbids imaginary numeric constants");
imag = 1;
break;
default:
ERROR ("invalid suffix on floating constant");
}
/* Setup input for parse_float() */
args.str = copy;
args.fflag = fflag;
args.lflag = lflag;
args.base = base;
/* Convert string to a double, checking for overflow. */
if (do_float_handler (parse_float, (PTR) &args))
{
/* Receive output from parse_float() */
real = args.value;
}
else
/* We got an exception from parse_float() */
ERROR ("floating constant out of range");
/* Receive output from parse_float() */
conversion_errno = args.conversion_errno;
type = args.type;
#ifdef ERANGE
/* ERANGE is also reported for underflow,
so test the value to distinguish overflow from that. */
if (conversion_errno == ERANGE && !flag_traditional && pedantic
&& (REAL_VALUES_LESS (dconst1, real)
|| REAL_VALUES_LESS (real, dconstm1)))
warning ("floating point number exceeds range of 'double'");
#endif
/* Create a node with determined type and value. */
if (imag)
value = build_complex (NULL_TREE, convert (type, integer_zero_node),
build_real (type, real));
else
value = build_real (type, real);
}
else
{
tree trad_type, ansi_type, type;
HOST_WIDE_INT high, low;
int spec_unsigned = 0;
int spec_long = 0;
int spec_long_long = 0;
int spec_imag = 0;
int suffix_lu = 0;
int warn = 0, i;
trad_type = ansi_type = type = NULL_TREE;
while (p < str + len)
{
c = *p++;
switch (c)
{
case 'u': case 'U':
if (spec_unsigned)
error ("two 'u' suffixes on integer constant");
else if (warn_traditional && !in_system_header
&& ! cpp_sys_macro_p (parse_in))
warning ("traditional C rejects the 'u' suffix");
spec_unsigned = 1;
if (spec_long)
suffix_lu = 1;
break;
case 'l': case 'L':
if (spec_long)
{
if (spec_long_long)
error ("three 'l' suffixes on integer constant");
else if (suffix_lu)
error ("'lul' is not a valid integer suffix");
else if (c != spec_long)
error ("'Ll' and 'lL' are not valid integer suffixes");
else if (pedantic && ! flag_isoc99
&& ! in_system_header && warn_long_long)
pedwarn ("ISO C89 forbids long long integer constants");
spec_long_long = 1;
}
spec_long = c;
break;
case 'i': case 'I': case 'j': case 'J':
if (spec_imag)
error ("more than one 'i' or 'j' suffix on integer constant");
else if (pedantic)
pedwarn ("ISO C forbids imaginary numeric constants");
spec_imag = 1;
break;
default:
ERROR ("invalid suffix on integer constant");
}
}
/* If the literal overflowed, pedwarn about it now. */
if (overflow)
{
warn = 1;
pedwarn ("integer constant is too large for this configuration of the compiler - truncated to %d bits", HOST_BITS_PER_WIDE_INT * 2);
}
/* This is simplified by the fact that our constant
is always positive. */
high = low = 0;
for (i = 0; i < HOST_BITS_PER_WIDE_INT / HOST_BITS_PER_CHAR; i++)
{
high |= ((HOST_WIDE_INT) parts[i + (HOST_BITS_PER_WIDE_INT
/ HOST_BITS_PER_CHAR)]
<< (i * HOST_BITS_PER_CHAR));
low |= (HOST_WIDE_INT) parts[i] << (i * HOST_BITS_PER_CHAR);
}
value = build_int_2 (low, high);
TREE_TYPE (value) = long_long_unsigned_type_node;
/* If warn_traditional, calculate both the ISO type and the
traditional type, then see if they disagree.
Otherwise, calculate only the type for the dialect in use. */
if (warn_traditional || flag_traditional)
{
/* Calculate the traditional type. */
/* Traditionally, any constant is signed; but if unsigned is
specified explicitly, obey that. Use the smallest size
with the right number of bits, except for one special
case with decimal constants. */
if (! spec_long && base != 10
&& int_fits_type_p (value, unsigned_type_node))
trad_type = spec_unsigned ? unsigned_type_node : integer_type_node;
/* A decimal constant must be long if it does not fit in
type int. I think this is independent of whether the
constant is signed. */
else if (! spec_long && base == 10
&& int_fits_type_p (value, integer_type_node))
trad_type = spec_unsigned ? unsigned_type_node : integer_type_node;
else if (! spec_long_long)
trad_type = (spec_unsigned
? long_unsigned_type_node
: long_integer_type_node);
else if (int_fits_type_p (value,
spec_unsigned
? long_long_unsigned_type_node
: long_long_integer_type_node))
trad_type = (spec_unsigned
? long_long_unsigned_type_node
: long_long_integer_type_node);
else
trad_type = (spec_unsigned
? widest_unsigned_literal_type_node
: widest_integer_literal_type_node);
}
if (warn_traditional || ! flag_traditional)
{
/* Calculate the ISO type. */
if (! spec_long && ! spec_unsigned
&& int_fits_type_p (value, integer_type_node))
ansi_type = integer_type_node;
else if (! spec_long && (base != 10 || spec_unsigned)
&& int_fits_type_p (value, unsigned_type_node))
ansi_type = unsigned_type_node;
else if (! spec_unsigned && !spec_long_long
&& int_fits_type_p (value, long_integer_type_node))
ansi_type = long_integer_type_node;
else if (! spec_long_long
&& int_fits_type_p (value, long_unsigned_type_node))
ansi_type = long_unsigned_type_node;
else if (! spec_unsigned
&& int_fits_type_p (value, long_long_integer_type_node))
ansi_type = long_long_integer_type_node;
else if (int_fits_type_p (value, long_long_unsigned_type_node))
ansi_type = long_long_unsigned_type_node;
else if (! spec_unsigned
&& int_fits_type_p (value, widest_integer_literal_type_node))
ansi_type = widest_integer_literal_type_node;
else
ansi_type = widest_unsigned_literal_type_node;
}
type = flag_traditional ? trad_type : ansi_type;
/* We assume that constants specified in a non-decimal
base are bit patterns, and that the programmer really
meant what they wrote. */
if (warn_traditional && !in_system_header
&& base == 10 && trad_type != ansi_type)
{
if (TYPE_PRECISION (trad_type) != TYPE_PRECISION (ansi_type))
warning ("width of integer constant changes with -traditional");
else if (TREE_UNSIGNED (trad_type) != TREE_UNSIGNED (ansi_type))
warning ("integer constant is unsigned in ISO C, signed with -traditional");
else
warning ("width of integer constant may change on other systems with -traditional");
}
if (pedantic && !flag_traditional && (flag_isoc99 || !spec_long_long)
&& !warn
&& ((flag_isoc99
? TYPE_PRECISION (long_long_integer_type_node)
: TYPE_PRECISION (long_integer_type_node)) < TYPE_PRECISION (type)))
{
warn = 1;
pedwarn ("integer constant larger than the maximum value of %s",
(flag_isoc99
? (TREE_UNSIGNED (type)
? _("an unsigned long long int")
: _("a long long int"))
: _("an unsigned long int")));
}
if (base == 10 && ! spec_unsigned && TREE_UNSIGNED (type))
warning ("decimal constant is so large that it is unsigned");
if (spec_imag)
{
if (TYPE_PRECISION (type)
<= TYPE_PRECISION (integer_type_node))
value = build_complex (NULL_TREE, integer_zero_node,
convert (integer_type_node, value));
else
ERROR ("complex integer constant is too wide for 'complex int'");
}
else if (flag_traditional && !int_fits_type_p (value, type))
/* The traditional constant 0x80000000 is signed
but doesn't fit in the range of int.
This will change it to -0x80000000, which does fit. */
{
TREE_TYPE (value) = unsigned_type (type);
value = convert (type, value);
TREE_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (value) = 0;
}
else
TREE_TYPE (value) = type;
/* If it's still an integer (not a complex), and it doesn't
fit in the type we choose for it, then pedwarn. */
if (! warn
&& TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE
&& ! int_fits_type_p (value, TREE_TYPE (value)))
pedwarn ("integer constant is larger than the maximum value for its type");
}
if (p < str + len)
error ("missing white space after number '%.*s'", (int) (p - str), str);
return value;
syntax_error:
return integer_zero_node;
}
static tree
lex_string (str, len, wide)
const char *str;
unsigned int len;
int wide;
{
tree value;
char *buf = alloca ((len + 1) * (wide ? WCHAR_BYTES : 1));
char *q = buf;
const char *p = str, *limit = str + len;
unsigned int c;
unsigned width = wide ? WCHAR_TYPE_SIZE
: TYPE_PRECISION (char_type_node);
#ifdef MULTIBYTE_CHARS
/* Reset multibyte conversion state. */
(void) local_mbtowc (NULL, NULL, 0);
#endif
while (p < limit)
{
#ifdef MULTIBYTE_CHARS
wchar_t wc;
int char_len;
char_len = local_mbtowc (&wc, p, limit - p);
if (char_len == -1)
{
warning ("ignoring invalid multibyte character");
char_len = 1;
c = *p++;
}
else
{
p += char_len;
c = wc;
}
#else
c = *p++;
#endif
if (c == '\\' && !ignore_escape_flag)
{
unsigned int mask;
if (width < HOST_BITS_PER_INT)
mask = ((unsigned int) 1 << width) - 1;
else
mask = ~0;
c = cpp_parse_escape (parse_in, (const unsigned char **) &p,
(const unsigned char *) limit,
mask, flag_traditional);
}
/* Add this single character into the buffer either as a wchar_t
or as a single byte. */
if (wide)
{
unsigned charwidth = TYPE_PRECISION (char_type_node);
unsigned bytemask = (1 << charwidth) - 1;
int byte;
for (byte = 0; byte < WCHAR_BYTES; ++byte)
{
int n;
if (byte >= (int) sizeof (c))
n = 0;
else
n = (c >> (byte * charwidth)) & bytemask;
if (BYTES_BIG_ENDIAN)
q[WCHAR_BYTES - byte - 1] = n;
else
q[byte] = n;
}
q += WCHAR_BYTES;
}
else
{
*q++ = c;
}
}
/* Terminate the string value, either with a single byte zero
or with a wide zero. */
if (wide)
{
memset (q, 0, WCHAR_BYTES);
q += WCHAR_BYTES;
}
else
{
*q++ = '\0';
}
value = build_string (q - buf, buf);
if (wide)
TREE_TYPE (value) = wchar_array_type_node;
else
TREE_TYPE (value) = char_array_type_node;
return value;
}
/* Converts a (possibly wide) character constant token into a tree. */
static tree
lex_charconst (token)
const cpp_token *token;
{
HOST_WIDE_INT result;
tree value;
unsigned int chars_seen;
result = cpp_interpret_charconst (parse_in, token, warn_multichar,
flag_traditional, &chars_seen);
if (token->type == CPP_WCHAR)
{
value = build_int_2 (result, 0);
TREE_TYPE (value) = wchar_type_node;
}
else
{
if (result < 0)
value = build_int_2 (result, -1);
else
value = build_int_2 (result, 0);
/* In C, a character constant has type 'int'.
In C++ 'char', but multi-char charconsts have type 'int'. */
if (c_language == clk_cplusplus && chars_seen <= 1)
TREE_TYPE (value) = char_type_node;
else
TREE_TYPE (value) = integer_type_node;
}
return value;
}
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