freebsd-dev/contrib/gcc/c-ppoutput.c
2007-05-19 01:19:51 +00:00

459 lines
13 KiB
C

/* Preprocess only, using cpplib.
Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
Free Software Foundation, Inc.
Written by Per Bothner, 1994-95.
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 2, 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; if not, write to the Free Software
Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "cpplib.h"
#include "../libcpp/internal.h"
#include "tree.h"
#include "c-common.h" /* For flags. */
#include "c-pragma.h" /* For parse_in. */
/* Encapsulates state used to convert a stream of tokens into a text
file. */
static struct
{
FILE *outf; /* Stream to write to. */
const cpp_token *prev; /* Previous token. */
const cpp_token *source; /* Source token for spacing. */
int src_line; /* Line number currently being written. */
unsigned char printed; /* Nonzero if something output at line. */
bool first_time; /* pp_file_change hasn't been called yet. */
} print;
/* General output routines. */
static void scan_translation_unit (cpp_reader *);
static void scan_translation_unit_trad (cpp_reader *);
static void account_for_newlines (const unsigned char *, size_t);
static int dump_macro (cpp_reader *, cpp_hashnode *, void *);
static void print_line (source_location, const char *);
static void maybe_print_line (source_location);
/* Callback routines for the parser. Most of these are active only
in specific modes. */
static void cb_line_change (cpp_reader *, const cpp_token *, int);
static void cb_define (cpp_reader *, source_location, cpp_hashnode *);
static void cb_undef (cpp_reader *, source_location, cpp_hashnode *);
static void cb_include (cpp_reader *, source_location, const unsigned char *,
const char *, int, const cpp_token **);
static void cb_ident (cpp_reader *, source_location, const cpp_string *);
static void cb_def_pragma (cpp_reader *, source_location);
static void cb_read_pch (cpp_reader *pfile, const char *name,
int fd, const char *orig_name);
/* Preprocess and output. */
void
preprocess_file (cpp_reader *pfile)
{
/* A successful cpp_read_main_file guarantees that we can call
cpp_scan_nooutput or cpp_get_token next. */
if (flag_no_output)
{
/* Scan -included buffers, then the main file. */
while (pfile->buffer->prev)
cpp_scan_nooutput (pfile);
cpp_scan_nooutput (pfile);
}
else if (cpp_get_options (pfile)->traditional)
scan_translation_unit_trad (pfile);
else
scan_translation_unit (pfile);
/* -dM command line option. Should this be elsewhere? */
if (flag_dump_macros == 'M')
cpp_forall_identifiers (pfile, dump_macro, NULL);
/* Flush any pending output. */
if (print.printed)
putc ('\n', print.outf);
}
/* Set up the callbacks as appropriate. */
void
init_pp_output (FILE *out_stream)
{
cpp_callbacks *cb = cpp_get_callbacks (parse_in);
if (!flag_no_output)
{
cb->line_change = cb_line_change;
/* Don't emit #pragma or #ident directives if we are processing
assembly language; the assembler may choke on them. */
if (cpp_get_options (parse_in)->lang != CLK_ASM)
{
cb->ident = cb_ident;
cb->def_pragma = cb_def_pragma;
}
}
if (flag_dump_includes)
cb->include = cb_include;
if (flag_pch_preprocess)
{
cb->valid_pch = c_common_valid_pch;
cb->read_pch = cb_read_pch;
}
if (flag_dump_macros == 'N' || flag_dump_macros == 'D')
{
cb->define = cb_define;
cb->undef = cb_undef;
}
/* Initialize the print structure. Setting print.src_line to -1 here is
a trick to guarantee that the first token of the file will cause
a linemarker to be output by maybe_print_line. */
print.src_line = -1;
print.printed = 0;
print.prev = 0;
print.outf = out_stream;
print.first_time = 1;
}
/* Writes out the preprocessed file, handling spacing and paste
avoidance issues. */
static void
scan_translation_unit (cpp_reader *pfile)
{
bool avoid_paste = false;
print.source = NULL;
for (;;)
{
const cpp_token *token = cpp_get_token (pfile);
if (token->type == CPP_PADDING)
{
avoid_paste = true;
if (print.source == NULL
|| (!(print.source->flags & PREV_WHITE)
&& token->val.source == NULL))
print.source = token->val.source;
continue;
}
if (token->type == CPP_EOF)
break;
/* Subtle logic to output a space if and only if necessary. */
if (avoid_paste)
{
if (print.source == NULL)
print.source = token;
if (print.source->flags & PREV_WHITE
|| (print.prev
&& cpp_avoid_paste (pfile, print.prev, token))
|| (print.prev == NULL && token->type == CPP_HASH))
putc (' ', print.outf);
}
else if (token->flags & PREV_WHITE)
putc (' ', print.outf);
avoid_paste = false;
print.source = NULL;
print.prev = token;
cpp_output_token (token, print.outf);
if (token->type == CPP_COMMENT)
account_for_newlines (token->val.str.text, token->val.str.len);
}
}
/* Adjust print.src_line for newlines embedded in output. */
static void
account_for_newlines (const unsigned char *str, size_t len)
{
while (len--)
if (*str++ == '\n')
print.src_line++;
}
/* Writes out a traditionally preprocessed file. */
static void
scan_translation_unit_trad (cpp_reader *pfile)
{
while (_cpp_read_logical_line_trad (pfile))
{
size_t len = pfile->out.cur - pfile->out.base;
maybe_print_line (pfile->out.first_line);
fwrite (pfile->out.base, 1, len, print.outf);
print.printed = 1;
if (!CPP_OPTION (pfile, discard_comments))
account_for_newlines (pfile->out.base, len);
}
}
/* If the token read on logical line LINE needs to be output on a
different line to the current one, output the required newlines or
a line marker, and return 1. Otherwise return 0. */
static void
maybe_print_line (source_location src_loc)
{
const struct line_map *map = linemap_lookup (&line_table, src_loc);
int src_line = SOURCE_LINE (map, src_loc);
/* End the previous line of text. */
if (print.printed)
{
putc ('\n', print.outf);
print.src_line++;
print.printed = 0;
}
if (src_line >= print.src_line && src_line < print.src_line + 8)
{
while (src_line > print.src_line)
{
putc ('\n', print.outf);
print.src_line++;
}
}
else
print_line (src_loc, "");
}
/* Output a line marker for logical line LINE. Special flags are "1"
or "2" indicating entering or leaving a file. */
static void
print_line (source_location src_loc, const char *special_flags)
{
/* End any previous line of text. */
if (print.printed)
putc ('\n', print.outf);
print.printed = 0;
if (!flag_no_line_commands)
{
const struct line_map *map = linemap_lookup (&line_table, src_loc);
size_t to_file_len = strlen (map->to_file);
unsigned char *to_file_quoted =
(unsigned char *) alloca (to_file_len * 4 + 1);
unsigned char *p;
print.src_line = SOURCE_LINE (map, src_loc);
/* cpp_quote_string does not nul-terminate, so we have to do it
ourselves. */
p = cpp_quote_string (to_file_quoted,
(unsigned char *) map->to_file, to_file_len);
*p = '\0';
fprintf (print.outf, "# %u \"%s\"%s",
print.src_line == 0 ? 1 : print.src_line,
to_file_quoted, special_flags);
if (map->sysp == 2)
fputs (" 3 4", print.outf);
else if (map->sysp == 1)
fputs (" 3", print.outf);
putc ('\n', print.outf);
}
}
/* Called when a line of output is started. TOKEN is the first token
of the line, and at end of file will be CPP_EOF. */
static void
cb_line_change (cpp_reader *pfile, const cpp_token *token,
int parsing_args)
{
source_location src_loc = token->src_loc;
if (token->type == CPP_EOF || parsing_args)
return;
maybe_print_line (src_loc);
print.prev = 0;
print.source = 0;
/* Supply enough spaces to put this token in its original column,
one space per column greater than 2, since scan_translation_unit
will provide a space if PREV_WHITE. Don't bother trying to
reconstruct tabs; we can't get it right in general, and nothing
ought to care. Some things do care; the fault lies with them. */
if (!CPP_OPTION (pfile, traditional))
{
const struct line_map *map = linemap_lookup (&line_table, src_loc);
int spaces = SOURCE_COLUMN (map, src_loc) - 2;
print.printed = 1;
while (-- spaces >= 0)
putc (' ', print.outf);
}
}
static void
cb_ident (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
const cpp_string *str)
{
maybe_print_line (line);
fprintf (print.outf, "#ident %s\n", str->text);
print.src_line++;
}
static void
cb_define (cpp_reader *pfile, source_location line, cpp_hashnode *node)
{
maybe_print_line (line);
fputs ("#define ", print.outf);
/* 'D' is whole definition; 'N' is name only. */
if (flag_dump_macros == 'D')
fputs ((const char *) cpp_macro_definition (pfile, node),
print.outf);
else
fputs ((const char *) NODE_NAME (node), print.outf);
putc ('\n', print.outf);
if (linemap_lookup (&line_table, line)->to_line != 0)
print.src_line++;
}
static void
cb_undef (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
cpp_hashnode *node)
{
maybe_print_line (line);
fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
print.src_line++;
}
static void
cb_include (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
const unsigned char *dir, const char *header, int angle_brackets,
const cpp_token **comments)
{
maybe_print_line (line);
if (angle_brackets)
fprintf (print.outf, "#%s <%s>", dir, header);
else
fprintf (print.outf, "#%s \"%s\"", dir, header);
if (comments != NULL)
{
while (*comments != NULL)
{
if ((*comments)->flags & PREV_WHITE)
putc (' ', print.outf);
cpp_output_token (*comments, print.outf);
++comments;
}
}
putc ('\n', print.outf);
print.src_line++;
}
/* Callback called when -fworking-director and -E to emit working
directory in cpp output file. */
void
pp_dir_change (cpp_reader *pfile ATTRIBUTE_UNUSED, const char *dir)
{
size_t to_file_len = strlen (dir);
unsigned char *to_file_quoted =
(unsigned char *) alloca (to_file_len * 4 + 1);
unsigned char *p;
/* cpp_quote_string does not nul-terminate, so we have to do it ourselves. */
p = cpp_quote_string (to_file_quoted, (unsigned char *) dir, to_file_len);
*p = '\0';
fprintf (print.outf, "# 1 \"%s//\"\n", to_file_quoted);
}
/* The file name, line number or system header flags have changed, as
described in MAP. */
void
pp_file_change (const struct line_map *map)
{
const char *flags = "";
if (flag_no_line_commands)
return;
if (map != NULL)
{
if (print.first_time)
{
/* Avoid printing foo.i when the main file is foo.c. */
if (!cpp_get_options (parse_in)->preprocessed)
print_line (map->start_location, flags);
print.first_time = 0;
}
else
{
/* Bring current file to correct line when entering a new file. */
if (map->reason == LC_ENTER)
{
const struct line_map *from = INCLUDED_FROM (&line_table, map);
maybe_print_line (LAST_SOURCE_LINE_LOCATION (from));
}
if (map->reason == LC_ENTER)
flags = " 1";
else if (map->reason == LC_LEAVE)
flags = " 2";
print_line (map->start_location, flags);
}
}
}
/* Copy a #pragma directive to the preprocessed output. */
static void
cb_def_pragma (cpp_reader *pfile, source_location line)
{
maybe_print_line (line);
fputs ("#pragma ", print.outf);
cpp_output_line (pfile, print.outf);
print.src_line++;
}
/* Dump out the hash table. */
static int
dump_macro (cpp_reader *pfile, cpp_hashnode *node, void *v ATTRIBUTE_UNUSED)
{
if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
{
fputs ("#define ", print.outf);
fputs ((const char *) cpp_macro_definition (pfile, node),
print.outf);
putc ('\n', print.outf);
print.src_line++;
}
return 1;
}
/* Load in the PCH file NAME, open on FD. It was originally searched for
by ORIG_NAME. Also, print out a #include command so that the PCH
file can be loaded when the preprocessed output is compiled. */
static void
cb_read_pch (cpp_reader *pfile, const char *name,
int fd, const char *orig_name ATTRIBUTE_UNUSED)
{
c_common_read_pch (pfile, name, fd, orig_name);
fprintf (print.outf, "#pragma GCC pch_preprocess \"%s\"\n", name);
print.src_line++;
}