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/* CPP Library - directive only preprocessing for distributed compilation.
Copyright (C) 2007-2018 Free Software Foundation, Inc.
Contributed by Ollie Wild <aaw@google.com>.
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"
/* DO (Directive only) flags. */
#define DO_BOL (1 << 0) /* At the beginning of a logical line. */
#define DO_STRING (1 << 1) /* In a string constant. */
#define DO_CHAR (1 << 2) /* In a character constant. */
#define DO_BLOCK_COMMENT (1 << 3) /* In a block comment. */
#define DO_LINE_COMMENT (1 << 4) /* In a single line "//-style" comment. */
#define DO_LINE_SPECIAL (DO_STRING | DO_CHAR | DO_LINE_COMMENT)
#define DO_SPECIAL (DO_LINE_SPECIAL | DO_BLOCK_COMMENT)
/* Writes out the preprocessed file, handling spacing and paste
avoidance issues. */
void
_cpp_preprocess_dir_only (cpp_reader *pfile,
const struct _cpp_dir_only_callbacks *cb)
{
struct cpp_buffer *buffer;
const unsigned char *cur, *base, *next_line, *rlimit;
cppchar_t c, last_c;
unsigned flags;
linenum_type lines;
int col;
source_location loc;
restart:
/* Buffer initialization ala _cpp_clean_line(). */
buffer = pfile->buffer;
buffer->cur_note = buffer->notes_used = 0;
buffer->cur = buffer->line_base = buffer->next_line;
buffer->need_line = false;
/* This isn't really needed. It prevents a compiler warning, though. */
loc = pfile->line_table->highest_line;
/* Scan initialization. */
next_line = cur = base = buffer->cur;
rlimit = buffer->rlimit;
flags = DO_BOL;
lines = 0;
col = 1;
for (last_c = '\n', c = *cur; cur < rlimit; last_c = c, c = *++cur, ++col)
{
/* Skip over escaped newlines. */
if (__builtin_expect (c == '\\', false))
{
const unsigned char *tmp = cur + 1;
while (is_nvspace (*tmp) && tmp < rlimit)
tmp++;
if (*tmp == '\r')
tmp++;
if (*tmp == '\n' && tmp < rlimit)
{
CPP_INCREMENT_LINE (pfile, 0);
lines++;
col = 0;
cur = tmp;
c = last_c;
continue;
}
}
if (__builtin_expect (last_c == '#', false) && !(flags & DO_SPECIAL))
{
if (c != '#' && (flags & DO_BOL))
{
struct line_maps *line_table;
if (!pfile->state.skipping && next_line != base)
cb->print_lines (lines, base, next_line - base);
/* Prep things for directive handling. */
buffer->next_line = cur;
buffer->need_line = true;
_cpp_get_fresh_line (pfile);
/* Ensure proper column numbering for generated error messages. */
buffer->line_base -= col - 1;
_cpp_handle_directive (pfile, 0 /* ignore indented */);
/* Sanitize the line settings. Duplicate #include's can mess
things up. */
line_table = pfile->line_table;
line_table->highest_location = line_table->highest_line;
/* The if block prevents us from outputing line information when
the file ends with a directive and no newline. Note that we
must use pfile->buffer, not buffer. */
if (pfile->buffer->next_line < pfile->buffer->rlimit)
cb->maybe_print_line (pfile->line_table->highest_line);
goto restart;
}
flags &= ~DO_BOL;
pfile->mi_valid = false;
}
else if (__builtin_expect (last_c == '/', false) \
&& !(flags & DO_SPECIAL) && c != '*' && c != '/')
{
/* If a previous slash is not starting a block comment, clear the
DO_BOL flag. */
flags &= ~DO_BOL;
pfile->mi_valid = false;
}
switch (c)
{
case '/':
if ((flags & DO_BLOCK_COMMENT) && last_c == '*')
{
flags &= ~DO_BLOCK_COMMENT;
c = 0;
}
else if (!(flags & DO_SPECIAL) && last_c == '/')
flags |= DO_LINE_COMMENT;
else if (!(flags & DO_SPECIAL))
/* Mark the position for possible error reporting. */
loc = linemap_position_for_column (pfile->line_table, col);
break;
case '*':
if (!(flags & DO_SPECIAL))
{
if (last_c == '/')
flags |= DO_BLOCK_COMMENT;
else
{
flags &= ~DO_BOL;
pfile->mi_valid = false;
}
}
break;
case '\'':
case '"':
{
unsigned state = (c == '"') ? DO_STRING : DO_CHAR;
if (!(flags & DO_SPECIAL))
{
flags |= state;
flags &= ~DO_BOL;
pfile->mi_valid = false;
}
else if ((flags & state) && last_c != '\\')
flags &= ~state;
break;
}
case '\\':
{
if ((flags & (DO_STRING | DO_CHAR)) && last_c == '\\')
c = 0;
if (!(flags & DO_SPECIAL))
{
flags &= ~DO_BOL;
pfile->mi_valid = false;
}
break;
}
case '\n':
CPP_INCREMENT_LINE (pfile, 0);
lines++;
col = 0;
flags &= ~DO_LINE_SPECIAL;
if (!(flags & DO_SPECIAL))
flags |= DO_BOL;
break;
case '#':
next_line = cur;
/* Don't update DO_BOL yet. */
break;
case ' ': case '\t': case '\f': case '\v': case '\0':
break;
default:
if (!(flags & DO_SPECIAL))
{
flags &= ~DO_BOL;
pfile->mi_valid = false;
}
break;
}
}
if (flags & DO_BLOCK_COMMENT)
cpp_error_with_line (pfile, CPP_DL_ERROR, loc, 0, "unterminated comment");
if (!pfile->state.skipping && cur != base)
{
/* If the file was not newline terminated, add rlimit, which is
guaranteed to point to a newline, to the end of our range. */
if (cur[-1] != '\n')
{
cur++;
CPP_INCREMENT_LINE (pfile, 0);
lines++;
}
cb->print_lines (lines, base, cur - base);
}
_cpp_pop_buffer (pfile);
if (pfile->buffer)
goto restart;
}
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