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|
/* GNU m4 -- A simple macro processor
Copyright (C) 1989-1994, 2006-2013 Free Software Foundation, Inc.
This file is part of GNU M4.
GNU M4 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 of the License, or
(at your option) any later version.
GNU M4 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, see <http://www.gnu.org/licenses/>.
*/
/* This module handles frozen files. */
#include "m4.h"
/*-------------------------------------------------------------------.
| Destructively reverse a symbol list and return the reversed list. |
`-------------------------------------------------------------------*/
static symbol *
reverse_symbol_list (symbol *sym)
{
symbol *result;
symbol *next;
result = NULL;
while (sym)
{
next = SYMBOL_NEXT (sym);
SYMBOL_NEXT (sym) = result;
result = sym;
sym = next;
}
return result;
}
/*------------------------------------------------.
| Produce a frozen state to the given file NAME. |
`------------------------------------------------*/
void
produce_frozen_state (const char *name)
{
FILE *file;
size_t h;
symbol *sym;
const builtin *bp;
file = fopen (name, O_BINARY ? "wb" : "w");
if (!file)
{
M4ERROR ((EXIT_FAILURE, errno, "cannot open `%s'", name));
return;
}
/* Write a recognizable header. */
xfprintf (file, "# This is a frozen state file generated by %s\n",
PACKAGE_STRING);
xfprintf (file, "V1\n");
/* Dump quote delimiters. */
if (strcmp (lquote.string, DEF_LQUOTE) || strcmp (rquote.string, DEF_RQUOTE))
{
xfprintf (file, "Q%d,%d\n", (int) lquote.length, (int) rquote.length);
fputs (lquote.string, file);
fputs (rquote.string, file);
fputc ('\n', file);
}
/* Dump comment delimiters. */
if (strcmp (bcomm.string, DEF_BCOMM) || strcmp (ecomm.string, DEF_ECOMM))
{
xfprintf (file, "C%d,%d\n", (int) bcomm.length, (int) ecomm.length);
fputs (bcomm.string, file);
fputs (ecomm.string, file);
fputc ('\n', file);
}
/* Dump all symbols. */
for (h = 0; h < hash_table_size; h++)
{
/* Process all entries in one bucket, from the last to the first.
This order ensures that, at reload time, pushdef's will be
executed with the oldest definitions first. */
symtab[h] = reverse_symbol_list (symtab[h]);
for (sym = symtab[h]; sym; sym = SYMBOL_NEXT (sym))
{
switch (SYMBOL_TYPE (sym))
{
case TOKEN_TEXT:
xfprintf (file, "T%d,%d\n",
(int) strlen (SYMBOL_NAME (sym)),
(int) strlen (SYMBOL_TEXT (sym)));
fputs (SYMBOL_NAME (sym), file);
fputs (SYMBOL_TEXT (sym), file);
fputc ('\n', file);
break;
case TOKEN_FUNC:
bp = find_builtin_by_addr (SYMBOL_FUNC (sym));
if (bp == NULL)
{
M4ERROR ((warning_status, 0, "\
INTERNAL ERROR: builtin not found in builtin table!"));
abort ();
}
xfprintf (file, "F%d,%d\n",
(int) strlen (SYMBOL_NAME (sym)),
(int) strlen (bp->name));
fputs (SYMBOL_NAME (sym), file);
fputs (bp->name, file);
fputc ('\n', file);
break;
case TOKEN_VOID:
/* Ignore placeholder tokens that exist due to traceon. */
break;
default:
M4ERROR ((warning_status, 0, "\
INTERNAL ERROR: bad token data type in freeze_one_symbol ()"));
abort ();
break;
}
}
/* Reverse the bucket once more, putting it back as it was. */
symtab[h] = reverse_symbol_list (symtab[h]);
}
/* Let diversions be issued from output.c module, its cleaner to have this
piece of code there. */
freeze_diversions (file);
/* All done. */
fputs ("# End of frozen state file\n", file);
if (close_stream (file) != 0)
M4ERROR ((EXIT_FAILURE, errno, "unable to create frozen state"));
}
/*----------------------------------------------------------------------.
| Issue a message saying that some character is an EXPECTED character. |
`----------------------------------------------------------------------*/
static void
issue_expect_message (int expected)
{
if (expected == '\n')
M4ERROR ((EXIT_FAILURE, 0, "expecting line feed in frozen file"));
else
M4ERROR ((EXIT_FAILURE, 0, "expecting character `%c' in frozen file",
expected));
}
/*-------------------------------------------------.
| Reload a frozen state from the given file NAME. |
`-------------------------------------------------*/
/* We are seeking speed, here. */
void
reload_frozen_state (const char *name)
{
FILE *file;
int character;
int operation;
char *string[2];
int allocated[2];
int number[2];
const builtin *bp;
bool advance_line = true;
#define GET_CHARACTER \
do \
{ \
if (advance_line) \
{ \
current_line++; \
advance_line = false; \
} \
(character = getc (file)); \
if (character == '\n') \
advance_line = true; \
} \
while (0)
#define GET_NUMBER(Number, AllowNeg) \
do \
{ \
unsigned int n = 0; \
while (isdigit (character) && n <= INT_MAX / 10U) \
{ \
n = 10 * n + character - '0'; \
GET_CHARACTER; \
} \
if (((AllowNeg) ? INT_MIN : INT_MAX) + 0U < n \
|| isdigit (character)) \
m4_error (EXIT_FAILURE, 0, \
_("integer overflow in frozen file")); \
(Number) = n; \
} \
while (0)
#define VALIDATE(Expected) \
do \
{ \
if (character != (Expected)) \
issue_expect_message (Expected); \
} \
while (0)
/* Skip comments (`#' at beginning of line) and blank lines, setting
character to the next directive or to EOF. */
#define GET_DIRECTIVE \
do \
{ \
GET_CHARACTER; \
if (character == '#') \
{ \
while (character != EOF && character != '\n') \
GET_CHARACTER; \
VALIDATE ('\n'); \
} \
} \
while (character == '\n')
#define GET_STRING(i) \
do \
{ \
void *tmp; \
char *p; \
if (number[(i)] + 1 > allocated[(i)]) \
{ \
free (string[(i)]); \
allocated[(i)] = number[(i)] + 1; \
string[(i)] = xcharalloc ((size_t) allocated[(i)]); \
} \
if (number[(i)] > 0 \
&& !fread (string[(i)], (size_t) number[(i)], 1, file)) \
m4_error (EXIT_FAILURE, 0, \
_("premature end of frozen file")); \
string[(i)][number[(i)]] = '\0'; \
p = string[(i)]; \
while ((tmp = memchr(p, '\n', number[(i)] - (p - string[(i)])))) \
{ \
current_line++; \
p = (char *) tmp + 1; \
} \
} \
while (0)
file = m4_path_search (name, NULL);
if (file == NULL)
M4ERROR ((EXIT_FAILURE, errno, "cannot open %s", name));
current_file = name;
allocated[0] = 100;
string[0] = xcharalloc ((size_t) allocated[0]);
allocated[1] = 100;
string[1] = xcharalloc ((size_t) allocated[1]);
/* Validate format version. Only `1' is acceptable for now. */
GET_DIRECTIVE;
VALIDATE ('V');
GET_CHARACTER;
GET_NUMBER (number[0], false);
if (number[0] > 1)
M4ERROR ((EXIT_MISMATCH, 0,
"frozen file version %d greater than max supported of 1",
number[0]));
else if (number[0] < 1)
M4ERROR ((EXIT_FAILURE, 0,
"ill-formed frozen file, version directive expected"));
VALIDATE ('\n');
GET_DIRECTIVE;
while (character != EOF)
{
switch (character)
{
default:
M4ERROR ((EXIT_FAILURE, 0, "ill-formed frozen file"));
case 'C':
case 'D':
case 'F':
case 'T':
case 'Q':
operation = character;
GET_CHARACTER;
/* Get string lengths. Accept a negative diversion number. */
if (operation == 'D' && character == '-')
{
GET_CHARACTER;
GET_NUMBER (number[0], true);
number[0] = -number[0];
}
else
GET_NUMBER (number[0], false);
VALIDATE (',');
GET_CHARACTER;
GET_NUMBER (number[1], false);
VALIDATE ('\n');
if (operation != 'D')
GET_STRING (0);
GET_STRING (1);
GET_CHARACTER;
VALIDATE ('\n');
/* Act according to operation letter. */
switch (operation)
{
case 'C':
/* Change comment strings. */
set_comment (string[0], string[1]);
break;
case 'D':
/* Select a diversion and add a string to it. */
make_diversion (number[0]);
if (number[1] > 0)
output_text (string[1], number[1]);
break;
case 'F':
/* Enter a macro having a builtin function as a definition. */
bp = find_builtin_by_name (string[1]);
define_builtin (string[0], bp, SYMBOL_PUSHDEF);
break;
case 'T':
/* Enter a macro having an expansion text as a definition. */
define_user_macro (string[0], string[1], SYMBOL_PUSHDEF);
break;
case 'Q':
/* Change quote strings. */
set_quotes (string[0], string[1]);
break;
default:
/* Cannot happen. */
break;
}
break;
}
GET_DIRECTIVE;
}
free (string[0]);
free (string[1]);
if (close_stream (file) != 0)
m4_error (EXIT_FAILURE, errno, _("unable to read frozen state"));
current_file = NULL;
current_line = 0;
#undef GET_CHARACTER
#undef GET_DIRECTIVE
#undef GET_NUMBER
#undef VALIDATE
#undef GET_STRING
}
|
