303 lines
6.8 KiB
C
303 lines
6.8 KiB
C
/*
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* Copyright 2007 Jon Loeliger, Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include "dtc.h"
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#include "srcpos.h"
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/* A node in our list of directories to search for source/include files */
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struct search_path {
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struct search_path *next; /* next node in list, NULL for end */
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const char *dirname; /* name of directory to search */
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};
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/* This is the list of directories that we search for source files */
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static struct search_path *search_path_head, **search_path_tail;
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static char *get_dirname(const char *path)
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{
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const char *slash = strrchr(path, '/');
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if (slash) {
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int len = slash - path;
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char *dir = xmalloc(len + 1);
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memcpy(dir, path, len);
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dir[len] = '\0';
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return dir;
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}
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return NULL;
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}
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FILE *depfile; /* = NULL */
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struct srcfile_state *current_srcfile; /* = NULL */
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/* Detect infinite include recursion. */
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#define MAX_SRCFILE_DEPTH (100)
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static int srcfile_depth; /* = 0 */
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/**
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* Try to open a file in a given directory.
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*
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* If the filename is an absolute path, then dirname is ignored. If it is a
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* relative path, then we look in that directory for the file.
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*
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* @param dirname Directory to look in, or NULL for none
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* @param fname Filename to look for
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* @param fp Set to NULL if file did not open
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* @return allocated filename on success (caller must free), NULL on failure
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*/
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static char *try_open(const char *dirname, const char *fname, FILE **fp)
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{
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char *fullname;
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if (!dirname || fname[0] == '/')
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fullname = xstrdup(fname);
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else
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fullname = join_path(dirname, fname);
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*fp = fopen(fullname, "rb");
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if (!*fp) {
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free(fullname);
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fullname = NULL;
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}
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return fullname;
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}
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/**
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* Open a file for read access
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*
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* If it is a relative filename, we search the full search path for it.
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*
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* @param fname Filename to open
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* @param fp Returns pointer to opened FILE, or NULL on failure
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* @return pointer to allocated filename, which caller must free
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*/
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static char *fopen_any_on_path(const char *fname, FILE **fp)
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{
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const char *cur_dir = NULL;
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struct search_path *node;
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char *fullname;
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/* Try current directory first */
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assert(fp);
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if (current_srcfile)
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cur_dir = current_srcfile->dir;
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fullname = try_open(cur_dir, fname, fp);
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/* Failing that, try each search path in turn */
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for (node = search_path_head; !*fp && node; node = node->next)
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fullname = try_open(node->dirname, fname, fp);
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return fullname;
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}
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FILE *srcfile_relative_open(const char *fname, char **fullnamep)
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{
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FILE *f;
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char *fullname;
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if (streq(fname, "-")) {
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f = stdin;
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fullname = xstrdup("<stdin>");
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} else {
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fullname = fopen_any_on_path(fname, &f);
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if (!f)
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die("Couldn't open \"%s\": %s\n", fname,
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strerror(errno));
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}
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if (depfile)
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fprintf(depfile, " %s", fullname);
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if (fullnamep)
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*fullnamep = fullname;
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else
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free(fullname);
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return f;
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}
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void srcfile_push(const char *fname)
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{
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struct srcfile_state *srcfile;
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if (srcfile_depth++ >= MAX_SRCFILE_DEPTH)
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die("Includes nested too deeply");
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srcfile = xmalloc(sizeof(*srcfile));
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srcfile->f = srcfile_relative_open(fname, &srcfile->name);
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srcfile->dir = get_dirname(srcfile->name);
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srcfile->prev = current_srcfile;
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srcfile->lineno = 1;
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srcfile->colno = 1;
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current_srcfile = srcfile;
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}
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bool srcfile_pop(void)
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{
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struct srcfile_state *srcfile = current_srcfile;
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assert(srcfile);
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current_srcfile = srcfile->prev;
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if (fclose(srcfile->f))
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die("Error closing \"%s\": %s\n", srcfile->name,
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strerror(errno));
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/* FIXME: We allow the srcfile_state structure to leak,
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* because it could still be referenced from a location
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* variable being carried through the parser somewhere. To
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* fix this we could either allocate all the files from a
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* table, or use a pool allocator. */
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return current_srcfile ? true : false;
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}
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void srcfile_add_search_path(const char *dirname)
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{
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struct search_path *node;
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/* Create the node */
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node = xmalloc(sizeof(*node));
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node->next = NULL;
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node->dirname = xstrdup(dirname);
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/* Add to the end of our list */
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if (search_path_tail)
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*search_path_tail = node;
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else
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search_path_head = node;
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search_path_tail = &node->next;
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}
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/*
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* The empty source position.
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*/
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struct srcpos srcpos_empty = {
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.first_line = 0,
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.first_column = 0,
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.last_line = 0,
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.last_column = 0,
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.file = NULL,
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};
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#define TAB_SIZE 8
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void srcpos_update(struct srcpos *pos, const char *text, int len)
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{
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int i;
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pos->file = current_srcfile;
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pos->first_line = current_srcfile->lineno;
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pos->first_column = current_srcfile->colno;
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for (i = 0; i < len; i++)
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if (text[i] == '\n') {
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current_srcfile->lineno++;
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current_srcfile->colno = 1;
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} else if (text[i] == '\t') {
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current_srcfile->colno =
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ALIGN(current_srcfile->colno, TAB_SIZE);
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} else {
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current_srcfile->colno++;
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}
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pos->last_line = current_srcfile->lineno;
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pos->last_column = current_srcfile->colno;
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}
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struct srcpos *
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srcpos_copy(struct srcpos *pos)
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{
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struct srcpos *pos_new;
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pos_new = xmalloc(sizeof(struct srcpos));
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memcpy(pos_new, pos, sizeof(struct srcpos));
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return pos_new;
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}
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char *
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srcpos_string(struct srcpos *pos)
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{
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const char *fname = "<no-file>";
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char *pos_str;
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if (pos)
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fname = pos->file->name;
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if (pos->first_line != pos->last_line)
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xasprintf(&pos_str, "%s:%d.%d-%d.%d", fname,
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pos->first_line, pos->first_column,
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pos->last_line, pos->last_column);
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else if (pos->first_column != pos->last_column)
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xasprintf(&pos_str, "%s:%d.%d-%d", fname,
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pos->first_line, pos->first_column,
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pos->last_column);
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else
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xasprintf(&pos_str, "%s:%d.%d", fname,
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pos->first_line, pos->first_column);
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return pos_str;
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}
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void srcpos_verror(struct srcpos *pos, const char *prefix,
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const char *fmt, va_list va)
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{
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char *srcstr;
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srcstr = srcpos_string(pos);
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fprintf(stderr, "%s: %s ", prefix, srcstr);
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vfprintf(stderr, fmt, va);
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fprintf(stderr, "\n");
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free(srcstr);
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}
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void srcpos_error(struct srcpos *pos, const char *prefix,
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const char *fmt, ...)
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{
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va_list va;
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va_start(va, fmt);
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srcpos_verror(pos, prefix, fmt, va);
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va_end(va);
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}
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void srcpos_set_line(char *f, int l)
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{
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current_srcfile->name = f;
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current_srcfile->lineno = l;
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}
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