757 lines
21 KiB
C
757 lines
21 KiB
C
/* Mainly the interface between cpplib and the C front ends.
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Copyright (C) 1987, 1988, 1989, 1992, 1994, 1995, 1996, 1997
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1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "real.h"
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#include "rtl.h"
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#include "tree.h"
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#include "expr.h"
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#include "input.h"
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#include "output.h"
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#include "c-tree.h"
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#include "c-common.h"
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#include "flags.h"
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#include "timevar.h"
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#include "cpplib.h"
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#include "c-pragma.h"
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#include "toplev.h"
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#include "intl.h"
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#include "tm_p.h"
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#include "splay-tree.h"
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#include "debug.h"
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/* The current line map. */
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static const struct line_map *map;
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/* We may keep statistics about how long which files took to compile. */
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static int header_time, body_time;
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static splay_tree file_info_tree;
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#undef WCHAR_TYPE_SIZE
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#define WCHAR_TYPE_SIZE TYPE_PRECISION (wchar_type_node)
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/* Number of bytes in a wide character. */
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#define WCHAR_BYTES (WCHAR_TYPE_SIZE / BITS_PER_UNIT)
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int pending_lang_change; /* If we need to switch languages - C++ only */
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int c_header_level; /* depth in C headers - C++ only */
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static tree interpret_integer (const cpp_token *, unsigned int);
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static tree interpret_float (const cpp_token *, unsigned int);
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static enum integer_type_kind
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narrowest_unsigned_type (tree, unsigned int);
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static enum integer_type_kind
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narrowest_signed_type (tree, unsigned int);
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static enum cpp_ttype lex_string (const cpp_token *, tree *, bool);
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static tree lex_charconst (const cpp_token *);
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static void update_header_times (const char *);
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static int dump_one_header (splay_tree_node, void *);
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static void cb_line_change (cpp_reader *, const cpp_token *, int);
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static void cb_ident (cpp_reader *, unsigned int, const cpp_string *);
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static void cb_def_pragma (cpp_reader *, unsigned int);
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static void cb_define (cpp_reader *, unsigned int, cpp_hashnode *);
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static void cb_undef (cpp_reader *, unsigned int, cpp_hashnode *);
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void
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init_c_lex (void)
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{
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struct cpp_callbacks *cb;
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struct c_fileinfo *toplevel;
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/* Set up filename timing. Must happen before cpp_read_main_file. */
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file_info_tree = splay_tree_new ((splay_tree_compare_fn)strcmp,
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0,
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(splay_tree_delete_value_fn)free);
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toplevel = get_fileinfo ("<top level>");
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if (flag_detailed_statistics)
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{
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header_time = 0;
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body_time = get_run_time ();
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toplevel->time = body_time;
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}
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cb = cpp_get_callbacks (parse_in);
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cb->line_change = cb_line_change;
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cb->ident = cb_ident;
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cb->def_pragma = cb_def_pragma;
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cb->valid_pch = c_common_valid_pch;
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cb->read_pch = c_common_read_pch;
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/* Set the debug callbacks if we can use them. */
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if (debug_info_level == DINFO_LEVEL_VERBOSE
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&& (write_symbols == DWARF_DEBUG || write_symbols == DWARF2_DEBUG
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|| write_symbols == VMS_AND_DWARF2_DEBUG))
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{
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cb->define = cb_define;
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cb->undef = cb_undef;
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}
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}
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struct c_fileinfo *
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get_fileinfo (const char *name)
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{
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splay_tree_node n;
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struct c_fileinfo *fi;
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n = splay_tree_lookup (file_info_tree, (splay_tree_key) name);
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if (n)
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return (struct c_fileinfo *) n->value;
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fi = xmalloc (sizeof (struct c_fileinfo));
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fi->time = 0;
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fi->interface_only = 0;
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fi->interface_unknown = 1;
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splay_tree_insert (file_info_tree, (splay_tree_key) name,
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(splay_tree_value) fi);
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return fi;
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}
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static void
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update_header_times (const char *name)
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{
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/* Changing files again. This means currently collected time
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is charged against header time, and body time starts back at 0. */
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if (flag_detailed_statistics)
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{
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int this_time = get_run_time ();
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struct c_fileinfo *file = get_fileinfo (name);
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header_time += this_time - body_time;
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file->time += this_time - body_time;
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body_time = this_time;
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}
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}
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static int
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dump_one_header (splay_tree_node n, void *dummy ATTRIBUTE_UNUSED)
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{
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print_time ((const char *) n->key,
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((struct c_fileinfo *) n->value)->time);
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return 0;
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}
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void
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dump_time_statistics (void)
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{
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struct c_fileinfo *file = get_fileinfo (input_filename);
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int this_time = get_run_time ();
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file->time += this_time - body_time;
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fprintf (stderr, "\n******\n");
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print_time ("header files (total)", header_time);
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print_time ("main file (total)", this_time - body_time);
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fprintf (stderr, "ratio = %g : 1\n",
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(double)header_time / (double)(this_time - body_time));
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fprintf (stderr, "\n******\n");
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splay_tree_foreach (file_info_tree, dump_one_header, 0);
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}
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static void
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cb_ident (cpp_reader *pfile ATTRIBUTE_UNUSED,
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unsigned int line ATTRIBUTE_UNUSED,
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const cpp_string *str ATTRIBUTE_UNUSED)
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{
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#ifdef ASM_OUTPUT_IDENT
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if (! flag_no_ident)
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{
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/* Convert escapes in the string. */
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cpp_string cstr = { 0, 0 };
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if (cpp_interpret_string (pfile, str, 1, &cstr, false))
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{
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ASM_OUTPUT_IDENT (asm_out_file, (const char *) cstr.text);
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free ((void *)cstr.text);
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}
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}
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#endif
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}
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/* Called at the start of every non-empty line. TOKEN is the first
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lexed token on the line. Used for diagnostic line numbers. */
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static void
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cb_line_change (cpp_reader *pfile ATTRIBUTE_UNUSED, const cpp_token *token,
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int parsing_args)
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{
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if (token->type == CPP_EOF || parsing_args)
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return;
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input_line = SOURCE_LINE (map, token->line);
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}
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void
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fe_file_change (const struct line_map *new_map)
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{
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if (new_map == NULL)
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{
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map = NULL;
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return;
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}
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if (new_map->reason == LC_ENTER)
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{
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/* Don't stack the main buffer on the input stack;
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we already did in compile_file. */
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if (map != NULL)
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{
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int included_at = SOURCE_LINE (new_map - 1, new_map->from_line - 1);
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input_line = included_at;
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push_srcloc (new_map->to_file, 1);
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(*debug_hooks->start_source_file) (included_at, new_map->to_file);
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#ifndef NO_IMPLICIT_EXTERN_C
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if (c_header_level)
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++c_header_level;
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else if (new_map->sysp == 2)
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{
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c_header_level = 1;
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++pending_lang_change;
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}
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#endif
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}
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}
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else if (new_map->reason == LC_LEAVE)
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{
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#ifndef NO_IMPLICIT_EXTERN_C
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if (c_header_level && --c_header_level == 0)
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{
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if (new_map->sysp == 2)
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warning ("badly nested C headers from preprocessor");
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--pending_lang_change;
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}
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#endif
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pop_srcloc ();
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(*debug_hooks->end_source_file) (new_map->to_line);
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}
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update_header_times (new_map->to_file);
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in_system_header = new_map->sysp != 0;
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input_filename = new_map->to_file;
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input_line = new_map->to_line;
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map = new_map;
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/* Hook for C++. */
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extract_interface_info ();
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}
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static void
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cb_def_pragma (cpp_reader *pfile, unsigned int line)
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{
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/* Issue a warning message if we have been asked to do so. Ignore
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unknown pragmas in system headers unless an explicit
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-Wunknown-pragmas has been given. */
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if (warn_unknown_pragmas > in_system_header)
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{
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const unsigned char *space, *name;
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const cpp_token *s;
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space = name = (const unsigned char *) "";
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s = cpp_get_token (pfile);
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if (s->type != CPP_EOF)
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{
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space = cpp_token_as_text (pfile, s);
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s = cpp_get_token (pfile);
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if (s->type == CPP_NAME)
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name = cpp_token_as_text (pfile, s);
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}
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input_line = SOURCE_LINE (map, line);
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warning ("ignoring #pragma %s %s", space, name);
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}
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}
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/* #define callback for DWARF and DWARF2 debug info. */
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static void
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cb_define (cpp_reader *pfile, unsigned int line, cpp_hashnode *node)
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{
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(*debug_hooks->define) (SOURCE_LINE (map, line),
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(const char *) cpp_macro_definition (pfile, node));
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}
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/* #undef callback for DWARF and DWARF2 debug info. */
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static void
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cb_undef (cpp_reader *pfile ATTRIBUTE_UNUSED, unsigned int line,
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cpp_hashnode *node)
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{
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(*debug_hooks->undef) (SOURCE_LINE (map, line),
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(const char *) NODE_NAME (node));
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}
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static inline const cpp_token *
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get_nonpadding_token (void)
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{
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const cpp_token *tok;
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timevar_push (TV_CPP);
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do
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tok = cpp_get_token (parse_in);
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while (tok->type == CPP_PADDING);
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timevar_pop (TV_CPP);
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return tok;
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}
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int
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c_lex_with_flags (tree *value, unsigned char *cpp_flags)
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{
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const cpp_token *tok;
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location_t atloc;
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static bool no_more_pch;
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retry:
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tok = get_nonpadding_token ();
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retry_after_at:
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switch (tok->type)
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{
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case CPP_NAME:
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*value = HT_IDENT_TO_GCC_IDENT (HT_NODE (tok->val.node));
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break;
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case CPP_NUMBER:
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{
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unsigned int flags = cpp_classify_number (parse_in, tok);
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switch (flags & CPP_N_CATEGORY)
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{
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case CPP_N_INVALID:
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/* cpplib has issued an error. */
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*value = error_mark_node;
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break;
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case CPP_N_INTEGER:
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*value = interpret_integer (tok, flags);
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break;
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case CPP_N_FLOATING:
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*value = interpret_float (tok, flags);
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break;
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default:
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abort ();
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}
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}
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break;
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case CPP_ATSIGN:
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/* An @ may give the next token special significance in Objective-C. */
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atloc = input_location;
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tok = get_nonpadding_token ();
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if (c_dialect_objc ())
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{
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tree val;
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switch (tok->type)
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{
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case CPP_NAME:
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val = HT_IDENT_TO_GCC_IDENT (HT_NODE (tok->val.node));
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if (C_IS_RESERVED_WORD (val)
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&& OBJC_IS_AT_KEYWORD (C_RID_CODE (val)))
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{
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*value = val;
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return CPP_AT_NAME;
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}
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break;
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case CPP_STRING:
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case CPP_WSTRING:
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return lex_string (tok, value, true);
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default: break;
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}
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}
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/* ... or not. */
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error ("%Hstray '@' in program", &atloc);
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goto retry_after_at;
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case CPP_OTHER:
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{
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cppchar_t c = tok->val.str.text[0];
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if (c == '"' || c == '\'')
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error ("missing terminating %c character", (int) c);
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else if (ISGRAPH (c))
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error ("stray '%c' in program", (int) c);
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else
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error ("stray '\\%o' in program", (int) c);
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}
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goto retry;
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case CPP_CHAR:
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case CPP_WCHAR:
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*value = lex_charconst (tok);
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break;
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case CPP_STRING:
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case CPP_WSTRING:
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return lex_string (tok, value, false);
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break;
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/* These tokens should not be visible outside cpplib. */
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case CPP_HEADER_NAME:
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case CPP_COMMENT:
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case CPP_MACRO_ARG:
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abort ();
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default:
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*value = NULL_TREE;
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break;
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}
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if (! no_more_pch)
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{
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no_more_pch = true;
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c_common_no_more_pch ();
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}
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if (cpp_flags)
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*cpp_flags = tok->flags;
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return tok->type;
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}
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int
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c_lex (tree *value)
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{
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return c_lex_with_flags (value, NULL);
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}
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/* Returns the narrowest C-visible unsigned type, starting with the
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minimum specified by FLAGS, that can fit VALUE, or itk_none if
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there isn't one. */
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static enum integer_type_kind
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narrowest_unsigned_type (tree value, unsigned int flags)
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{
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enum integer_type_kind itk;
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if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
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itk = itk_unsigned_int;
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else if ((flags & CPP_N_WIDTH) == CPP_N_MEDIUM)
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itk = itk_unsigned_long;
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else
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itk = itk_unsigned_long_long;
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/* int_fits_type_p must think the type of its first argument is
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wider than its second argument, or it won't do the proper check. */
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TREE_TYPE (value) = widest_unsigned_literal_type_node;
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for (; itk < itk_none; itk += 2 /* skip unsigned types */)
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if (int_fits_type_p (value, integer_types[itk]))
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return itk;
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return itk_none;
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}
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/* Ditto, but narrowest signed type. */
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static enum integer_type_kind
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narrowest_signed_type (tree value, unsigned int flags)
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{
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enum integer_type_kind itk;
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if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
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itk = itk_int;
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else if ((flags & CPP_N_WIDTH) == CPP_N_MEDIUM)
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itk = itk_long;
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else
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itk = itk_long_long;
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/* int_fits_type_p must think the type of its first argument is
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wider than its second argument, or it won't do the proper check. */
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TREE_TYPE (value) = widest_unsigned_literal_type_node;
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for (; itk < itk_none; itk += 2 /* skip signed types */)
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if (int_fits_type_p (value, integer_types[itk]))
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return itk;
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return itk_none;
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}
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/* Interpret TOKEN, an integer with FLAGS as classified by cpplib. */
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static tree
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interpret_integer (const cpp_token *token, unsigned int flags)
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{
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tree value, type;
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enum integer_type_kind itk;
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cpp_num integer;
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cpp_options *options = cpp_get_options (parse_in);
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integer = cpp_interpret_integer (parse_in, token, flags);
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integer = cpp_num_sign_extend (integer, options->precision);
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value = build_int_2_wide (integer.low, integer.high);
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/* The type of a constant with a U suffix is straightforward. */
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if (flags & CPP_N_UNSIGNED)
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itk = narrowest_unsigned_type (value, flags);
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else
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{
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/* The type of a potentially-signed integer constant varies
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depending on the base it's in, the standard in use, and the
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length suffixes. */
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enum integer_type_kind itk_u = narrowest_unsigned_type (value, flags);
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enum integer_type_kind itk_s = narrowest_signed_type (value, flags);
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/* In both C89 and C99, octal and hex constants may be signed or
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unsigned, whichever fits tighter. We do not warn about this
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choice differing from the traditional choice, as the constant
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is probably a bit pattern and either way will work. */
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if ((flags & CPP_N_RADIX) != CPP_N_DECIMAL)
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itk = MIN (itk_u, itk_s);
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else
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{
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/* In C99, decimal constants are always signed.
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In C89, decimal constants that don't fit in long have
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undefined behavior; we try to make them unsigned long.
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||
In GCC's extended C89, that last is true of decimal
|
||
constants that don't fit in long long, too. */
|
||
|
||
itk = itk_s;
|
||
if (itk_s > itk_u && itk_s > itk_long)
|
||
{
|
||
if (!flag_isoc99)
|
||
{
|
||
if (itk_u < itk_unsigned_long)
|
||
itk_u = itk_unsigned_long;
|
||
itk = itk_u;
|
||
warning ("this decimal constant is unsigned only in ISO C90");
|
||
}
|
||
else if (warn_traditional)
|
||
warning ("this decimal constant would be unsigned in ISO C90");
|
||
}
|
||
}
|
||
}
|
||
|
||
if (itk == itk_none)
|
||
/* cpplib has already issued a warning for overflow. */
|
||
type = ((flags & CPP_N_UNSIGNED)
|
||
? widest_unsigned_literal_type_node
|
||
: widest_integer_literal_type_node);
|
||
else
|
||
type = integer_types[itk];
|
||
|
||
if (itk > itk_unsigned_long
|
||
&& (flags & CPP_N_WIDTH) != CPP_N_LARGE
|
||
&& ! in_system_header && ! flag_isoc99)
|
||
pedwarn ("integer constant is too large for \"%s\" type",
|
||
(flags & CPP_N_UNSIGNED) ? "unsigned long" : "long");
|
||
|
||
TREE_TYPE (value) = type;
|
||
|
||
/* Convert imaginary to a complex type. */
|
||
if (flags & CPP_N_IMAGINARY)
|
||
value = build_complex (NULL_TREE, convert (type, integer_zero_node), value);
|
||
|
||
return value;
|
||
}
|
||
|
||
/* Interpret TOKEN, a floating point number with FLAGS as classified
|
||
by cpplib. */
|
||
static tree
|
||
interpret_float (const cpp_token *token, unsigned int flags)
|
||
{
|
||
tree type;
|
||
tree value;
|
||
REAL_VALUE_TYPE real;
|
||
char *copy;
|
||
size_t copylen;
|
||
const char *typename;
|
||
|
||
/* FIXME: make %T work in error/warning, then we don't need typename. */
|
||
if ((flags & CPP_N_WIDTH) == CPP_N_LARGE)
|
||
{
|
||
type = long_double_type_node;
|
||
typename = "long double";
|
||
}
|
||
else if ((flags & CPP_N_WIDTH) == CPP_N_SMALL
|
||
|| flag_single_precision_constant)
|
||
{
|
||
type = float_type_node;
|
||
typename = "float";
|
||
}
|
||
else
|
||
{
|
||
type = double_type_node;
|
||
typename = "double";
|
||
}
|
||
|
||
/* Copy the constant to a nul-terminated buffer. If the constant
|
||
has any suffixes, cut them off; REAL_VALUE_ATOF/ REAL_VALUE_HTOF
|
||
can't handle them. */
|
||
copylen = token->val.str.len;
|
||
if ((flags & CPP_N_WIDTH) != CPP_N_MEDIUM)
|
||
/* Must be an F or L suffix. */
|
||
copylen--;
|
||
if (flags & CPP_N_IMAGINARY)
|
||
/* I or J suffix. */
|
||
copylen--;
|
||
|
||
copy = alloca (copylen + 1);
|
||
memcpy (copy, token->val.str.text, copylen);
|
||
copy[copylen] = '\0';
|
||
|
||
real_from_string (&real, copy);
|
||
real_convert (&real, TYPE_MODE (type), &real);
|
||
|
||
/* A diagnostic is required for "soft" overflow by some ISO C
|
||
testsuites. This is not pedwarn, because some people don't want
|
||
an error for this.
|
||
??? That's a dubious reason... is this a mandatory diagnostic or
|
||
isn't it? -- zw, 2001-08-21. */
|
||
if (REAL_VALUE_ISINF (real) && pedantic)
|
||
warning ("floating constant exceeds range of \"%s\"", typename);
|
||
|
||
/* Create a node with determined type and value. */
|
||
value = build_real (type, real);
|
||
if (flags & CPP_N_IMAGINARY)
|
||
value = build_complex (NULL_TREE, convert (type, integer_zero_node), value);
|
||
|
||
return value;
|
||
}
|
||
|
||
/* Convert a series of STRING and/or WSTRING tokens into a tree,
|
||
performing string constant concatenation. TOK is the first of
|
||
these. VALP is the location to write the string into. OBJC_STRING
|
||
indicates whether an '@' token preceded the incoming token.
|
||
Returns the CPP token type of the result (CPP_STRING, CPP_WSTRING,
|
||
or CPP_OBJC_STRING).
|
||
|
||
This is unfortunately more work than it should be. If any of the
|
||
strings in the series has an L prefix, the result is a wide string
|
||
(6.4.5p4). Whether or not the result is a wide string affects the
|
||
meaning of octal and hexadecimal escapes (6.4.4.4p6,9). But escape
|
||
sequences do not continue across the boundary between two strings in
|
||
a series (6.4.5p7), so we must not lose the boundaries. Therefore
|
||
cpp_interpret_string takes a vector of cpp_string structures, which
|
||
we must arrange to provide. */
|
||
|
||
static enum cpp_ttype
|
||
lex_string (const cpp_token *tok, tree *valp, bool objc_string)
|
||
{
|
||
tree value;
|
||
bool wide = false;
|
||
size_t count = 1;
|
||
struct obstack str_ob;
|
||
cpp_string istr;
|
||
|
||
/* Try to avoid the overhead of creating and destroying an obstack
|
||
for the common case of just one string. */
|
||
cpp_string str = tok->val.str;
|
||
cpp_string *strs = &str;
|
||
|
||
if (tok->type == CPP_WSTRING)
|
||
wide = true;
|
||
|
||
tok = get_nonpadding_token ();
|
||
if (c_dialect_objc () && tok->type == CPP_ATSIGN)
|
||
{
|
||
objc_string = true;
|
||
tok = get_nonpadding_token ();
|
||
}
|
||
if (tok->type == CPP_STRING || tok->type == CPP_WSTRING)
|
||
{
|
||
gcc_obstack_init (&str_ob);
|
||
obstack_grow (&str_ob, &str, sizeof (cpp_string));
|
||
|
||
do
|
||
{
|
||
count++;
|
||
if (tok->type == CPP_WSTRING)
|
||
wide = true;
|
||
obstack_grow (&str_ob, &tok->val.str, sizeof (cpp_string));
|
||
|
||
tok = get_nonpadding_token ();
|
||
if (c_dialect_objc () && tok->type == CPP_ATSIGN)
|
||
{
|
||
objc_string = true;
|
||
tok = get_nonpadding_token ();
|
||
}
|
||
}
|
||
while (tok->type == CPP_STRING || tok->type == CPP_WSTRING);
|
||
strs = obstack_finish (&str_ob);
|
||
}
|
||
|
||
/* We have read one more token than we want. */
|
||
_cpp_backup_tokens (parse_in, 1);
|
||
|
||
if (count > 1 && !objc_string && warn_traditional && !in_system_header)
|
||
warning ("traditional C rejects string constant concatenation");
|
||
|
||
if (cpp_interpret_string (parse_in, strs, count, &istr, wide))
|
||
{
|
||
value = build_string (istr.len, (char *)istr.text);
|
||
free ((void *)istr.text);
|
||
}
|
||
else
|
||
{
|
||
/* Callers cannot generally handle error_mark_node in this context,
|
||
so return the empty string instead. cpp_interpret_string has
|
||
issued an error. */
|
||
if (wide)
|
||
value = build_string (TYPE_PRECISION (wchar_type_node)
|
||
/ TYPE_PRECISION (char_type_node),
|
||
"\0\0\0"); /* widest supported wchar_t
|
||
is 32 bits */
|
||
else
|
||
value = build_string (1, "");
|
||
}
|
||
|
||
TREE_TYPE (value) = wide ? wchar_array_type_node : char_array_type_node;
|
||
*valp = fix_string_type (value);
|
||
|
||
if (strs != &str)
|
||
obstack_free (&str_ob, 0);
|
||
|
||
return objc_string ? CPP_OBJC_STRING : wide ? CPP_WSTRING : CPP_STRING;
|
||
}
|
||
|
||
/* Converts a (possibly wide) character constant token into a tree. */
|
||
static tree
|
||
lex_charconst (const cpp_token *token)
|
||
{
|
||
cppchar_t result;
|
||
tree type, value;
|
||
unsigned int chars_seen;
|
||
int unsignedp;
|
||
|
||
result = cpp_interpret_charconst (parse_in, token,
|
||
&chars_seen, &unsignedp);
|
||
|
||
/* Cast to cppchar_signed_t to get correct sign-extension of RESULT
|
||
before possibly widening to HOST_WIDE_INT for build_int_2. */
|
||
if (unsignedp || (cppchar_signed_t) result >= 0)
|
||
value = build_int_2 (result, 0);
|
||
else
|
||
value = build_int_2 ((cppchar_signed_t) result, -1);
|
||
|
||
if (token->type == CPP_WCHAR)
|
||
type = wchar_type_node;
|
||
/* In C, a character constant has type 'int'.
|
||
In C++ 'char', but multi-char charconsts have type 'int'. */
|
||
else if (!c_dialect_cxx () || chars_seen > 1)
|
||
type = integer_type_node;
|
||
else
|
||
type = char_type_node;
|
||
|
||
TREE_TYPE (value) = type;
|
||
return value;
|
||
}
|