/**
* mds — A micro-display server
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* 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 of the License, 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, see <http://www.gnu.org/licenses/>.
*/
#include "process-includes.h"
#include "make-tree.h"
#include "simplify-tree.h"
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
/**
* Tree type constant shortener
*/
#define C(TYPE) MDS_KBDC_TREE_TYPE_##TYPE
/**
* Add an error to the error list
*
* @param NODE:const mds_kbdc_tree_t* The node the triggered the error
* @param SEVERITY:identifier * in `MDS_KBDC_PARSE_ERROR_*` to indicate severity
* @param ...:const char*, ... Error description format string and arguments
* @scope error:mds_kbdc_parse_error_t* Variable where the new error will be stored
*/
#define NEW_ERROR(NODE, SEVERITY, ...) \
NEW_ERROR_(result, SEVERITY, 1, (NODE)->loc_line, \
(NODE)->loc_start, (NODE)->loc_end, 1, __VA_ARGS__)
/**
* Variable whether the latest created error is stored
*/
static mds_kbdc_parse_error_t* error;
/**
* The parameter of `process_includes`
*/
static mds_kbdc_parsed_t* restrict result;
/**
* Stack of attributes of already included files
*/
static struct stat* restrict included;
/**
* The number elements allocated for `included`
*/
static size_t included_size = 0;
/**
* The number elements stored in `included`
*/
static size_t included_ptr = 0;
/**
* Transfer errors from an included tree
*
* @param subresult The results of the processed include
* @param tree The include statement
*/
static int transfer_errors(mds_kbdc_parsed_t* restrict subresult, mds_kbdc_tree_include_t* restrict tree)
{
mds_kbdc_parse_error_t** errors = NULL;
mds_kbdc_parse_error_t* suberror;
size_t errors_ptr = 0;
int saved_errno, annotated = 0;
/* Allocate temporary list for errors. */
if (subresult->errors_ptr == 0)
return 0;
fail_if (xmalloc(errors, subresult->errors_ptr * 2, mds_kbdc_parse_error_t*));
/* List errors backwards, so that we can easily handle errors and add “included from here”-note. */
while (subresult->errors_ptr--)
{
suberror = subresult->errors[subresult->errors_ptr];
/* If it is more severe than a note, we want to say there it was included. */
if (annotated == 0)
{
NEW_ERROR(tree, NOTE, "included from here");
errors[errors_ptr++] = error;
result->errors[--(result->errors_ptr)] = NULL;
annotated = 1;
}
/* Include error. */
errors[errors_ptr++] = suberror;
subresult->errors[subresult->errors_ptr] = NULL;
/* Make sure when there are nested inclusions that the outermost inclusion * is annotated last. */
if (suberror->severity > MDS_KBDC_PARSE_ERROR_NOTE)
annotated = 0;
}
/* Append errors. */
for (; errors_ptr--; errors[errors_ptr] = NULL)
{
if (result->errors_ptr + 1 >= result->errors_size)
{
size_t new_errors_size = result->errors_size ? (result->errors_size << 1) : 2;
mds_kbdc_parse_error_t** new_errors = result->errors;
fail_if (xrealloc(new_errors, new_errors_size, mds_kbdc_parse_error_t*));
result->errors = new_errors;
result->errors_size = new_errors_size;
}
result->errors[result->errors_ptr++] = errors[errors_ptr];
result->errors[result->errors_ptr] = NULL;
}
free(errors);
return 0;
pfail:
saved_errno = errno;
while (errors_ptr--)
mds_kbdc_parse_error_free(errors[errors_ptr]);
free(errors);
return errno = saved_errno, -1;
}
/**
* Process an include-statement
*
* @param tree The include-statement
* @return Zero on success, -1 on error
*/
static int process_include(mds_kbdc_tree_include_t* restrict tree)
{
#define process(expr) \
fail_if ((expr) < 0); \
if (mds_kbdc_parsed_is_fatal(&subresult)) \
goto stop;
mds_kbdc_parsed_t subresult;
mds_kbdc_parsed_t* our_result;
char* dirname = NULL;
char* cwd = NULL;
char* old = NULL;
size_t cwd_size = 4096 >> 1;
int saved_errno;
/* Initialise result structure for the included file. */
mds_kbdc_parsed_initialise(&subresult);
/* Get dirname of current file. */
fail_if ((dirname = strdup(result->pathname)) == NULL);
*(strrchr(dirname, '/')) = '\0';
/* Get the current working directory. */
/* glibc offers ways to do this in just one function call,
* but we will not assume that glibc is used here. */
for (;;)
{
fail_if (xxrealloc(old, cwd, cwd_size <<= 1, char));
if (getcwd(cwd, cwd_size))
break;
else
fail_if (errno != ERANGE);
}
/* Switch working directory. */
fail_if (chdir(dirname));
free(dirname), dirname = NULL;
/* Store `result` as it will be switched by the inner `process_includes`. */
our_result = result;
/* Process include. */
old = tree->filename, tree->filename = NULL;
tree->filename = parse_raw_string(old);
fail_if (tree->filename == NULL);
free(old), old = NULL;
process (parse_to_tree(tree->filename, &subresult));
process (simplify_tree(&subresult));
process (process_includes(&subresult));
stop:
/* Switch back `result`. */
result = our_result;
/* Switch back to the old working directory. */
fail_if (chdir(cwd));
free(cwd), cwd = NULL;
/* Move over data to our result. */
free(tree->filename);
tree->filename = subresult.pathname, subresult.pathname = NULL;
tree->inner = subresult.tree, subresult.tree = NULL;
if (result->severest_error_level < subresult.severest_error_level)
result->severest_error_level = subresult.severest_error_level;
/* Move over errors. */
fail_if (transfer_errors(&subresult, tree));
/* Release resources. */
mds_kbdc_parsed_destroy(&subresult);
return 0;
pfail:
saved_errno = errno;
free(dirname);
free(cwd);
free(old);
mds_kbdc_parsed_destroy(&subresult);
return errno = saved_errno, -1;
#undef process
}
/**
* Process a subtree
*
* @param tree The tree
* @return Zero on success, -1 on error
*/
static int process_includes_in_tree(mds_kbdc_tree_t* restrict tree)
{
#define p(expr) if ((r = process_includes_in_tree(tree->expr))) return r
int r;
again:
if (tree == NULL)
return 0;
switch (tree->type)
{
case C(INFORMATION): p (information.inner); break;
case C(FUNCTION): p (function.inner); break;
case C(MACRO): p (macro.inner); break;
case C(ASSUMPTION): p (assumption.inner); break;
case C(FOR): p (for_.inner); break;
case C(IF): p (if_.inner); p (if_.otherwise); break;
case C(INCLUDE):
if ((r = process_include(&(tree->include))))
return r;
break;
default:
break;
}
tree = tree->next;
goto again;
#undef p
}
/**
* Include included files and process them upto this level
*
* @param result_ `result` from `simplify_tree`, will be updated
* @return -1 if an error occursed that cannot be stored in `result`, zero otherwise
*/
int process_includes(mds_kbdc_parsed_t* restrict result_)
{
int r, saved_errno;
struct stat attr;
size_t i;
result = result_;
fail_if (stat(result->pathname, &attr));
if (included_ptr == included_size)
{
struct stat* old;
if (xxrealloc(old, included, included_size += 4, struct stat))
return included = old, -1;
}
for (i = 0; i < included_ptr; i++)
if ((included[i].st_dev == attr.st_dev) && (included[i].st_ino == attr.st_ino))
{
NEW_ERROR_(result, ERROR, 0, 0, 0, 0, 1, "resursive inclusion");
return 0;
}
included[included_ptr++] = attr;
r = process_includes_in_tree(result_->tree);
saved_errno = errno;
if (--included_ptr == 0)
free(included), included_size = 0;
return errno = saved_errno, r;
pfail:
return -1;
}
#undef NEW_ERROR
#undef C
