/* * Copyright 2007 Jon Loeliger, Freescale Semiconductor, Inc. * * 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 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, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * USA */ #define _GNU_SOURCE #include <stdio.h> #include "dtc.h" #include "srcpos.h" /* A node in our list of directories to search for source/include files */ struct search_path { struct search_path *next; /* next node in list, NULL for end */ const char *dirname; /* name of directory to search */ }; /* This is the list of directories that we search for source files */ static struct search_path *search_path_head, **search_path_tail; static char *get_dirname(const char *path) { const char *slash = strrchr(path, '/'); if (slash) { int len = slash - path; char *dir = xmalloc(len + 1); memcpy(dir, path, len); dir[len] = '\0'; return dir; } return NULL; } FILE *depfile; /* = NULL */ struct srcfile_state *current_srcfile; /* = NULL */ /* Detect infinite include recursion. */ #define MAX_SRCFILE_DEPTH (100) static int srcfile_depth; /* = 0 */ /** * Try to open a file in a given directory. * * If the filename is an absolute path, then dirname is ignored. If it is a * relative path, then we look in that directory for the file. * * @param dirname Directory to look in, or NULL for none * @param fname Filename to look for * @param fp Set to NULL if file did not open * @return allocated filename on success (caller must free), NULL on failure */ static char *try_open(const char *dirname, const char *fname, FILE **fp) { char *fullname; if (!dirname || fname[0] == '/') fullname = xstrdup(fname); else fullname = join_path(dirname, fname); *fp = fopen(fullname, "rb"); if (!*fp) { free(fullname); fullname = NULL; } return fullname; } /** * Open a file for read access * * If it is a relative filename, we search the full search path for it. * * @param fname Filename to open * @param fp Returns pointer to opened FILE, or NULL on failure * @return pointer to allocated filename, which caller must free */ static char *fopen_any_on_path(const char *fname, FILE **fp) { const char *cur_dir = NULL; struct search_path *node; char *fullname; /* Try current directory first */ assert(fp); if (current_srcfile) cur_dir = current_srcfile->dir; fullname = try_open(cur_dir, fname, fp); /* Failing that, try each search path in turn */ for (node = search_path_head; !*fp && node; node = node->next) fullname = try_open(node->dirname, fname, fp); return fullname; } FILE *srcfile_relative_open(const char *fname, char **fullnamep) { FILE *f; char *fullname; if (streq(fname, "-")) { f = stdin; fullname = xstrdup("<stdin>"); } else { fullname = fopen_any_on_path(fname, &f); if (!f) die("Couldn't open \"%s\": %s\n", fname, strerror(errno)); } if (depfile) fprintf(depfile, " %s", fullname); if (fullnamep) *fullnamep = fullname; else free(fullname); return f; } void srcfile_push(const char *fname) { struct srcfile_state *srcfile; if (srcfile_depth++ >= MAX_SRCFILE_DEPTH) die("Includes nested too deeply"); srcfile = xmalloc(sizeof(*srcfile)); srcfile->f = srcfile_relative_open(fname, &srcfile->name); srcfile->dir = get_dirname(srcfile->name); srcfile->prev = current_srcfile; srcfile->lineno = 1; srcfile->colno = 1; current_srcfile = srcfile; } bool srcfile_pop(void) { struct srcfile_state *srcfile = current_srcfile; assert(srcfile); current_srcfile = srcfile->prev; if (fclose(srcfile->f)) die("Error closing \"%s\": %s\n", srcfile->name, strerror(errno)); /* FIXME: We allow the srcfile_state structure to leak, * because it could still be referenced from a location * variable being carried through the parser somewhere. To * fix this we could either allocate all the files from a * table, or use a pool allocator. */ return current_srcfile ? true : false; } void srcfile_add_search_path(const char *dirname) { struct search_path *node; /* Create the node */ node = xmalloc(sizeof(*node)); node->next = NULL; node->dirname = xstrdup(dirname); /* Add to the end of our list */ if (search_path_tail) *search_path_tail = node; else search_path_head = node; search_path_tail = &node->next; } /* * The empty source position. */ struct srcpos srcpos_empty = { .first_line = 0, .first_column = 0, .last_line = 0, .last_column = 0, .file = NULL, }; #define TAB_SIZE 8 void srcpos_update(struct srcpos *pos, const char *text, int len) { int i; pos->file = current_srcfile; pos->first_line = current_srcfile->lineno; pos->first_column = current_srcfile->colno; for (i = 0; i < len; i++) if (text[i] == '\n') { current_srcfile->lineno++; current_srcfile->colno = 1; } else if (text[i] == '\t') { current_srcfile->colno = ALIGN(current_srcfile->colno, TAB_SIZE); } else { current_srcfile->colno++; } pos->last_line = current_srcfile->lineno; pos->last_column = current_srcfile->colno; } struct srcpos * srcpos_copy(struct srcpos *pos) { struct srcpos *pos_new; pos_new = xmalloc(sizeof(struct srcpos)); memcpy(pos_new, pos, sizeof(struct srcpos)); return pos_new; } char * srcpos_string(struct srcpos *pos) { const char *fname = "<no-file>"; char *pos_str; if (pos->file && pos->file->name) fname = pos->file->name; if (pos->first_line != pos->last_line) xasprintf(&pos_str, "%s:%d.%d-%d.%d", fname, pos->first_line, pos->first_column, pos->last_line, pos->last_column); else if (pos->first_column != pos->last_column) xasprintf(&pos_str, "%s:%d.%d-%d", fname, pos->first_line, pos->first_column, pos->last_column); else xasprintf(&pos_str, "%s:%d.%d", fname, pos->first_line, pos->first_column); return pos_str; } void srcpos_verror(struct srcpos *pos, const char *prefix, const char *fmt, va_list va) { char *srcstr; srcstr = srcpos_string(pos); fprintf(stderr, "%s: %s ", prefix, srcstr); vfprintf(stderr, fmt, va); fprintf(stderr, "\n"); free(srcstr); } void srcpos_error(struct srcpos *pos, const char *prefix, const char *fmt, ...) { va_list va; va_start(va, fmt); srcpos_verror(pos, prefix, fmt, va); va_end(va); } void srcpos_set_line(char *f, int l) { current_srcfile->name = f; current_srcfile->lineno = l; }