mirror of
https://review.haiku-os.org/buildtools
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92b3138b83
Updated dependencies: * GMP 6.2.1 * ISL 0.24 * MPL 1.2.1 * MPFR 4.1.0 The dependencies were pulled in by running the ./contrib/download_prerequisites script and then manually removing the symbolic links and archives, and renaming the directories (i.e mv isl-0.24 to isl)
2175 lines
61 KiB
C++
2175 lines
61 KiB
C++
/* Part of CPP library. File handling.
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Copyright (C) 1986-2023 Free Software Foundation, Inc.
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Written by Per Bothner, 1994.
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Based on CCCP program by Paul Rubin, June 1986
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Adapted to ANSI C, Richard Stallman, Jan 1987
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Split out of cpplib.c, Zack Weinberg, Oct 1998
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Reimplemented, Neil Booth, Jul 2003
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#include "cpplib.h"
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#include "internal.h"
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#include "mkdeps.h"
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#include "obstack.h"
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#include "hashtab.h"
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#include "md5.h"
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#include <dirent.h>
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/* Variable length record files on VMS will have a stat size that includes
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record control characters that won't be included in the read size. */
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#ifdef VMS
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# define FAB_C_VAR 2 /* variable length records (see Starlet fabdef.h) */
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# define STAT_SIZE_RELIABLE(ST) ((ST).st_fab_rfm != FAB_C_VAR)
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#else
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# define STAT_SIZE_RELIABLE(ST) true
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#endif
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#ifdef __DJGPP__
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#include <io.h>
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/* For DJGPP redirected input is opened in text mode. */
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# define set_stdin_to_binary_mode() \
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if (! isatty (0)) setmode (0, O_BINARY)
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#else
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# define set_stdin_to_binary_mode() /* Nothing */
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#endif
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/* This structure represents a file searched for by CPP, whether it
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exists or not. An instance may be pointed to by more than one
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cpp_file_hash_entry; at present no reference count is kept. */
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struct _cpp_file
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{
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/* Filename as given to #include or command line switch. */
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const char *name;
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/* The full path used to find the file. */
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const char *path;
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/* The full path of the pch file. */
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const char *pchname;
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/* The file's path with the basename stripped. NULL if it hasn't
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been calculated yet. */
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const char *dir_name;
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/* Chain through all files. */
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struct _cpp_file *next_file;
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/* The contents of NAME after calling read_file(). */
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const uchar *buffer;
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/* Pointer to the real start of BUFFER. read_file() might increment
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BUFFER; when freeing, this this pointer must be used instead. */
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const uchar *buffer_start;
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/* The macro, if any, preventing re-inclusion. */
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const cpp_hashnode *cmacro;
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/* The directory in the search path where FILE was found. Used for
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#include_next and determining whether a header is a system
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header. */
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cpp_dir *dir;
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/* As filled in by stat(2) for the file. */
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struct stat st;
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/* File descriptor. Invalid if -1, otherwise open. */
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int fd;
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/* Zero if this file was successfully opened and stat()-ed,
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otherwise errno obtained from failure. */
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int err_no;
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/* Number of times the file has been stacked for preprocessing. */
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unsigned short stack_count;
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/* If opened with #import or contains #pragma once. */
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bool once_only : 1;
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/* If read() failed before. */
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bool dont_read : 1;
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/* If BUFFER above contains the true contents of the file. */
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bool buffer_valid : 1;
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/* If this file is implicitly preincluded. */
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bool implicit_preinclude : 1;
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/* > 0: Known C++ Module header unit, <0: known not. ==0, unknown */
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int header_unit : 2;
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};
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/* A singly-linked list for all searches for a given file name, with
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its head pointed to by a slot in FILE_HASH. The file name is what
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appeared between the quotes in a #include directive; it can be
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determined implicitly from the hash table location or explicitly
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from FILE->name.
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FILE is a structure containing details about the file that was
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found with that search, or details of how the search failed.
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START_DIR is the starting location of the search in the include
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chain. The current directories for "" includes are also hashed in
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the hash table and therefore unique. Files that are looked up
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without using a search path, such as absolute filenames and file
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names from the command line share a special starting directory so
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they don't cause cache hits with normal include-chain lookups.
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If START_DIR is NULL then the entry is for a directory, not a file,
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and the directory is in DIR. Since the starting point in a file
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lookup chain is never NULL, this means that simple pointer
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comparisons against START_DIR can be made to determine cache hits
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in file lookups.
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If a cache lookup fails because of e.g. an extra "./" in the path,
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then nothing will break. It is just less efficient as CPP will
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have to do more work re-preprocessing the file, and/or comparing
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its contents against earlier once-only files.
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*/
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struct cpp_file_hash_entry
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{
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struct cpp_file_hash_entry *next;
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cpp_dir *start_dir;
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location_t location;
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union
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{
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_cpp_file *file;
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cpp_dir *dir;
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} u;
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};
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/* Number of entries to put in a cpp_file_hash_entry pool. */
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#define FILE_HASH_POOL_SIZE 127
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/* A file hash entry pool. We allocate cpp_file_hash_entry object from
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one of these. */
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struct file_hash_entry_pool
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{
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/* Number of entries used from this pool. */
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unsigned int file_hash_entries_used;
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/* Next pool in the chain; used when freeing. */
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struct file_hash_entry_pool *next;
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/* The memory pool. */
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struct cpp_file_hash_entry pool[FILE_HASH_POOL_SIZE];
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};
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static bool open_file (_cpp_file *file);
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static bool pch_open_file (cpp_reader *pfile, _cpp_file *file,
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bool *invalid_pch);
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static bool find_file_in_dir (cpp_reader *pfile, _cpp_file *file,
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bool *invalid_pch, location_t loc);
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static bool read_file_guts (cpp_reader *pfile, _cpp_file *file,
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location_t loc, const char *input_charset);
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static bool read_file (cpp_reader *pfile, _cpp_file *file,
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location_t loc);
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static struct cpp_dir *search_path_head (cpp_reader *, const char *fname,
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int angle_brackets, enum include_type);
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static const char *dir_name_of_file (_cpp_file *file);
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static void open_file_failed (cpp_reader *pfile, _cpp_file *file, int,
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location_t);
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static struct cpp_file_hash_entry *search_cache (struct cpp_file_hash_entry *head,
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const cpp_dir *start_dir);
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static _cpp_file *make_cpp_file (cpp_dir *, const char *fname);
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static void destroy_cpp_file (_cpp_file *);
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static cpp_dir *make_cpp_dir (cpp_reader *, const char *dir_name, int sysp);
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static void allocate_file_hash_entries (cpp_reader *pfile);
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static struct cpp_file_hash_entry *new_file_hash_entry (cpp_reader *pfile);
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static int report_missing_guard (void **slot, void *b);
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static hashval_t file_hash_hash (const void *p);
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static int file_hash_eq (const void *p, const void *q);
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static char *read_filename_string (int ch, FILE *f);
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static void read_name_map (cpp_dir *dir);
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static char *remap_filename (cpp_reader *pfile, _cpp_file *file);
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static char *append_file_to_dir (const char *fname, cpp_dir *dir);
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static bool validate_pch (cpp_reader *, _cpp_file *file, const char *pchname);
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static int pchf_save_compare (const void *e1, const void *e2);
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static int pchf_compare (const void *d_p, const void *e_p);
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static bool check_file_against_entries (cpp_reader *, _cpp_file *, bool);
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/* Given a filename in FILE->PATH, with the empty string interpreted
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as <stdin>, open it.
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On success FILE contains an open file descriptor and stat
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information for the file. On failure the file descriptor is -1 and
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the appropriate errno is also stored in FILE. Returns TRUE iff
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successful.
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We used to open files in nonblocking mode, but that caused more
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problems than it solved. Do take care not to acquire a controlling
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terminal by mistake (this can't happen on sane systems, but
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paranoia is a virtue).
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Use the three-argument form of open even though we aren't
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specifying O_CREAT, to defend against broken system headers.
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O_BINARY tells some runtime libraries (notably DJGPP) not to do
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newline translation; we can handle DOS line breaks just fine
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ourselves. */
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static bool
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open_file (_cpp_file *file)
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{
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if (file->path[0] == '\0')
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{
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file->fd = 0;
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set_stdin_to_binary_mode ();
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}
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else
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file->fd = open (file->path, O_RDONLY | O_NOCTTY | O_BINARY, 0666);
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if (file->fd != -1)
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{
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if (fstat (file->fd, &file->st) == 0)
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{
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if (!S_ISDIR (file->st.st_mode))
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{
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file->err_no = 0;
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return true;
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}
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/* Ignore a directory and continue the search. The file we're
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looking for may be elsewhere in the search path. */
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errno = ENOENT;
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}
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close (file->fd);
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file->fd = -1;
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}
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#if defined(_WIN32) && !defined(__CYGWIN__)
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else if (errno == EACCES)
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{
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/* On most UNIX systems, open succeeds on a directory. Above,
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we check if we have opened a directory and if so, set errno
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to ENOENT. However, on Windows, opening a directory
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fails with EACCES. We want to return ENOENT in that
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case too. */
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if (stat (file->path, &file->st) == 0
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&& S_ISDIR (file->st.st_mode))
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errno = ENOENT;
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else
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/* The call to stat may have reset errno. */
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errno = EACCES;
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}
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#endif
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else if (errno == ENOTDIR)
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errno = ENOENT;
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file->err_no = errno;
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return false;
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}
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/* Temporary PCH intercept of opening a file. Try to find a PCH file
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based on FILE->name and FILE->dir, and test those found for
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validity using PFILE->cb.valid_pch. Return true iff a valid file is
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found. Set *INVALID_PCH if a PCH file is found but wasn't valid. */
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static bool
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pch_open_file (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch)
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{
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static const char extension[] = ".gch";
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const char *path = file->path;
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size_t len, flen;
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char *pchname;
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struct stat st;
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bool valid = false;
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/* No PCH on <stdin> or if not requested. */
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if (file->name[0] == '\0' || !pfile->cb.valid_pch)
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return false;
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/* If the file is not included as first include from either the toplevel
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file or the command-line it is not a valid use of PCH. */
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for (_cpp_file *f = pfile->all_files; f; f = f->next_file)
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if (f->implicit_preinclude)
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continue;
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else if (pfile->main_file == f)
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break;
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else
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return false;
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flen = strlen (path);
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len = flen + sizeof (extension);
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pchname = XNEWVEC (char, len);
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memcpy (pchname, path, flen);
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memcpy (pchname + flen, extension, sizeof (extension));
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if (stat (pchname, &st) == 0)
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{
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DIR *pchdir;
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struct dirent *d;
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size_t dlen, plen = len;
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if (!S_ISDIR (st.st_mode))
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valid = validate_pch (pfile, file, pchname);
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else if ((pchdir = opendir (pchname)) != NULL)
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{
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pchname[plen - 1] = '/';
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while ((d = readdir (pchdir)) != NULL)
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{
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dlen = strlen (d->d_name) + 1;
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if ((strcmp (d->d_name, ".") == 0)
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|| (strcmp (d->d_name, "..") == 0))
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continue;
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if (dlen + plen > len)
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{
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len += dlen + 64;
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pchname = XRESIZEVEC (char, pchname, len);
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}
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memcpy (pchname + plen, d->d_name, dlen);
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valid = validate_pch (pfile, file, pchname);
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if (valid)
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break;
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}
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closedir (pchdir);
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}
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if (!valid)
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*invalid_pch = true;
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}
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if (valid)
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file->pchname = pchname;
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else
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free (pchname);
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return valid;
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}
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/* Canonicalize the path to FILE. Return the canonical form if it is
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shorter, otherwise return NULL. This function does NOT free the
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memory pointed by FILE. */
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static char *
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maybe_shorter_path (const char * file)
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{
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char * file2 = lrealpath (file);
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if (file2 && strlen (file2) < strlen (file))
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{
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return file2;
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}
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else
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{
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free (file2);
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return NULL;
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}
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}
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/* Try to open the path FILE->name appended to FILE->dir. This is
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where remap and PCH intercept the file lookup process. Return true
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if the file was found, whether or not the open was successful.
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Set *INVALID_PCH to true if a PCH file is found but wasn't valid.
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Use LOC when emitting any diagnostics. */
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static bool
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find_file_in_dir (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch,
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location_t loc)
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{
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char *path;
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if (CPP_OPTION (pfile, remap) && (path = remap_filename (pfile, file)))
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;
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else
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if (file->dir->construct)
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path = file->dir->construct (file->name, file->dir);
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else
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path = append_file_to_dir (file->name, file->dir);
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||
|
||
if (path)
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{
|
||
hashval_t hv;
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char *copy;
|
||
void **pp;
|
||
|
||
/* We try to canonicalize system headers. For DOS based file
|
||
* system, we always try to shorten non-system headers, as DOS
|
||
* has a tighter constraint on max path length. */
|
||
if ((CPP_OPTION (pfile, canonical_system_headers) && file->dir->sysp)
|
||
#ifdef HAVE_DOS_BASED_FILE_SYSTEM
|
||
|| !file->dir->sysp
|
||
#endif
|
||
)
|
||
{
|
||
char * canonical_path = maybe_shorter_path (path);
|
||
if (canonical_path)
|
||
{
|
||
/* The canonical path was newly allocated. Let's free the
|
||
non-canonical one. */
|
||
free (path);
|
||
path = canonical_path;
|
||
}
|
||
}
|
||
|
||
hv = htab_hash_string (path);
|
||
if (htab_find_with_hash (pfile->nonexistent_file_hash, path, hv) != NULL)
|
||
{
|
||
file->err_no = ENOENT;
|
||
return false;
|
||
}
|
||
|
||
file->path = path;
|
||
if (pch_open_file (pfile, file, invalid_pch))
|
||
return true;
|
||
|
||
if (open_file (file))
|
||
return true;
|
||
|
||
if (file->err_no != ENOENT)
|
||
{
|
||
open_file_failed (pfile, file, 0, loc);
|
||
return true;
|
||
}
|
||
|
||
/* We copy the path name onto an obstack partly so that we don't
|
||
leak the memory, but mostly so that we don't fragment the
|
||
heap. */
|
||
copy = (char *) obstack_copy0 (&pfile->nonexistent_file_ob, path,
|
||
strlen (path));
|
||
free (path);
|
||
pp = htab_find_slot_with_hash (pfile->nonexistent_file_hash,
|
||
copy, hv, INSERT);
|
||
*pp = copy;
|
||
|
||
file->path = file->name;
|
||
}
|
||
else
|
||
{
|
||
file->err_no = ENOENT;
|
||
file->path = NULL;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/* Return true iff the missing_header callback found the given HEADER. */
|
||
static bool
|
||
search_path_exhausted (cpp_reader *pfile, const char *header, _cpp_file *file)
|
||
{
|
||
missing_header_cb func = pfile->cb.missing_header;
|
||
|
||
/* When the regular search path doesn't work, try context dependent
|
||
headers search paths. */
|
||
if (func
|
||
&& file->dir == NULL)
|
||
{
|
||
if ((file->path = func (pfile, header, &file->dir)) != NULL)
|
||
{
|
||
if (open_file (file))
|
||
return true;
|
||
free ((void *)file->path);
|
||
}
|
||
file->path = file->name;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
bool
|
||
_cpp_find_failed (_cpp_file *file)
|
||
{
|
||
return file->err_no != 0;
|
||
}
|
||
|
||
/* Given a filename FNAME search for such a file in the include path
|
||
starting from START_DIR. If FNAME is the empty string it is
|
||
interpreted as STDIN if START_DIR is PFILE->no_search_path.
|
||
|
||
If the file is not found in the file cache fall back to the O/S and
|
||
add the result to our cache.
|
||
|
||
If the file was not found in the filesystem, or there was an error
|
||
opening it, then ERR_NO is nonzero and FD is -1. If the file was
|
||
found, then ERR_NO is zero and FD could be -1 or an open file
|
||
descriptor. FD can be -1 if the file was found in the cache and
|
||
had previously been closed. To open it again pass the return value
|
||
to open_file().
|
||
|
||
If KIND is _cpp_FFK_PRE_INCLUDE then it is OK for the file to be
|
||
missing. If present, it is OK for a precompiled header to be
|
||
included after it.
|
||
|
||
Use LOC as the location for any errors. */
|
||
|
||
_cpp_file *
|
||
_cpp_find_file (cpp_reader *pfile, const char *fname, cpp_dir *start_dir,
|
||
int angle_brackets, _cpp_find_file_kind kind, location_t loc)
|
||
{
|
||
bool invalid_pch = false;
|
||
bool saw_bracket_include = false;
|
||
bool saw_quote_include = false;
|
||
struct cpp_dir *found_in_cache = NULL;
|
||
|
||
/* Ensure we get no confusion between cached files and directories. */
|
||
if (start_dir == NULL)
|
||
cpp_error_at (pfile, CPP_DL_ICE, loc, "NULL directory in find_file");
|
||
|
||
void **hash_slot
|
||
= htab_find_slot_with_hash (pfile->file_hash, fname,
|
||
htab_hash_string (fname), INSERT);
|
||
|
||
/* First check the cache before we resort to memory allocation. */
|
||
cpp_file_hash_entry *entry
|
||
= search_cache ((struct cpp_file_hash_entry *) *hash_slot, start_dir);
|
||
if (entry)
|
||
return entry->u.file;
|
||
|
||
_cpp_file *file = make_cpp_file (start_dir, fname);
|
||
file->implicit_preinclude
|
||
= (kind == _cpp_FFK_PRE_INCLUDE
|
||
|| (pfile->buffer && pfile->buffer->file->implicit_preinclude));
|
||
|
||
if (kind != _cpp_FFK_FAKE)
|
||
/* Try each path in the include chain. */
|
||
for (;;)
|
||
{
|
||
if (find_file_in_dir (pfile, file, &invalid_pch, loc))
|
||
break;
|
||
|
||
file->dir = file->dir->next;
|
||
if (file->dir == NULL)
|
||
{
|
||
if (search_path_exhausted (pfile, fname, file))
|
||
{
|
||
/* Although this file must not go in the cache,
|
||
because the file found might depend on things (like
|
||
the current file) that aren't represented in the
|
||
cache, it still has to go in the list of all files
|
||
so that #import works. */
|
||
file->next_file = pfile->all_files;
|
||
pfile->all_files = file;
|
||
if (*hash_slot == NULL)
|
||
{
|
||
/* If *hash_slot is NULL, the above
|
||
htab_find_slot_with_hash call just created the
|
||
slot, but we aren't going to store there anything
|
||
of use, so need to remove the newly created entry.
|
||
htab_clear_slot requires that it is non-NULL, so
|
||
store some non-NULL but valid pointer there,
|
||
htab_clear_slot will immediately overwrite it. */
|
||
*hash_slot = file;
|
||
htab_clear_slot (pfile->file_hash, hash_slot);
|
||
}
|
||
return file;
|
||
}
|
||
|
||
if (invalid_pch)
|
||
{
|
||
cpp_error (pfile, CPP_DL_ERROR,
|
||
"one or more PCH files were found,"
|
||
" but they were invalid");
|
||
if (!cpp_get_options (pfile)->warn_invalid_pch)
|
||
cpp_error (pfile, CPP_DL_NOTE,
|
||
"use -Winvalid-pch for more information");
|
||
}
|
||
|
||
if (kind == _cpp_FFK_PRE_INCLUDE)
|
||
{
|
||
free ((char *) file->name);
|
||
free (file);
|
||
if (*hash_slot == NULL)
|
||
{
|
||
/* See comment on the above htab_clear_slot call. */
|
||
*hash_slot = &hash_slot;
|
||
htab_clear_slot (pfile->file_hash, hash_slot);
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
if (kind != _cpp_FFK_HAS_INCLUDE)
|
||
open_file_failed (pfile, file, angle_brackets, loc);
|
||
break;
|
||
}
|
||
|
||
/* Only check the cache for the starting location (done above)
|
||
and the quote and bracket chain heads because there are no
|
||
other possible starting points for searches. */
|
||
if (file->dir == pfile->bracket_include)
|
||
saw_bracket_include = true;
|
||
else if (file->dir == pfile->quote_include)
|
||
saw_quote_include = true;
|
||
else
|
||
continue;
|
||
|
||
entry
|
||
= search_cache ((struct cpp_file_hash_entry *) *hash_slot, file->dir);
|
||
if (entry)
|
||
{
|
||
found_in_cache = file->dir;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (entry)
|
||
{
|
||
/* Cache for START_DIR too, sharing the _cpp_file structure. */
|
||
free ((char *) file->name);
|
||
free (file);
|
||
file = entry->u.file;
|
||
}
|
||
else
|
||
{
|
||
/* This is a new file; put it in the list. */
|
||
file->next_file = pfile->all_files;
|
||
pfile->all_files = file;
|
||
}
|
||
|
||
/* Store this new result in the hash table. */
|
||
entry = new_file_hash_entry (pfile);
|
||
entry->next = (struct cpp_file_hash_entry *) *hash_slot;
|
||
entry->start_dir = start_dir;
|
||
entry->location = loc;
|
||
entry->u.file = file;
|
||
*hash_slot = (void *) entry;
|
||
|
||
/* If we passed the quote or bracket chain heads, cache them also.
|
||
This speeds up processing if there are lots of -I options. */
|
||
if (saw_bracket_include
|
||
&& pfile->bracket_include != start_dir
|
||
&& found_in_cache != pfile->bracket_include)
|
||
{
|
||
entry = new_file_hash_entry (pfile);
|
||
entry->next = (struct cpp_file_hash_entry *) *hash_slot;
|
||
entry->start_dir = pfile->bracket_include;
|
||
entry->location = loc;
|
||
entry->u.file = file;
|
||
*hash_slot = (void *) entry;
|
||
}
|
||
if (saw_quote_include
|
||
&& pfile->quote_include != start_dir
|
||
&& found_in_cache != pfile->quote_include)
|
||
{
|
||
entry = new_file_hash_entry (pfile);
|
||
entry->next = (struct cpp_file_hash_entry *) *hash_slot;
|
||
entry->start_dir = pfile->quote_include;
|
||
entry->location = loc;
|
||
entry->u.file = file;
|
||
*hash_slot = (void *) entry;
|
||
}
|
||
|
||
return file;
|
||
}
|
||
|
||
/* Read a file into FILE->buffer, returning true on success.
|
||
|
||
If FILE->fd is something weird, like a block device, we don't want
|
||
to read it at all. Don't even try to figure out what something is,
|
||
except for plain files and block devices, since there is no
|
||
reliable portable way of doing this.
|
||
|
||
Use LOC for any diagnostics.
|
||
|
||
PFILE may be NULL. In this case, no diagnostics are issued.
|
||
|
||
FIXME: Flush file cache and try again if we run out of memory. */
|
||
static bool
|
||
read_file_guts (cpp_reader *pfile, _cpp_file *file, location_t loc,
|
||
const char *input_charset)
|
||
{
|
||
ssize_t size, total, count;
|
||
uchar *buf;
|
||
bool regular;
|
||
|
||
if (S_ISBLK (file->st.st_mode))
|
||
{
|
||
if (pfile)
|
||
cpp_error_at (pfile, CPP_DL_ERROR, loc,
|
||
"%s is a block device", file->path);
|
||
return false;
|
||
}
|
||
|
||
regular = S_ISREG (file->st.st_mode) != 0;
|
||
if (regular)
|
||
{
|
||
/* off_t might have a wider range than ssize_t - in other words,
|
||
the max size of a file might be bigger than the address
|
||
space. We can't handle a file that large. (Anyone with
|
||
a single source file bigger than 2GB needs to rethink
|
||
their coding style.) Some systems (e.g. AIX 4.1) define
|
||
SSIZE_MAX to be much smaller than the actual range of the
|
||
type. Use INTTYPE_MAXIMUM unconditionally to ensure this
|
||
does not bite us. */
|
||
if (file->st.st_size > INTTYPE_MAXIMUM (ssize_t))
|
||
{
|
||
if (pfile)
|
||
cpp_error_at (pfile, CPP_DL_ERROR, loc,
|
||
"%s is too large", file->path);
|
||
return false;
|
||
}
|
||
|
||
size = file->st.st_size;
|
||
}
|
||
else
|
||
/* 8 kilobytes is a sensible starting size. It ought to be bigger
|
||
than the kernel pipe buffer, and it's definitely bigger than
|
||
the majority of C source files. */
|
||
size = 8 * 1024;
|
||
|
||
/* The + 16 here is space for the final '\n' and 15 bytes of padding,
|
||
used to quiet warnings from valgrind or Address Sanitizer, when the
|
||
optimized lexer accesses aligned 16-byte memory chunks, including
|
||
the bytes after the malloced, area, and stops lexing on '\n'. */
|
||
buf = XNEWVEC (uchar, size + 16);
|
||
total = 0;
|
||
while ((count = read (file->fd, buf + total, size - total)) > 0)
|
||
{
|
||
total += count;
|
||
|
||
if (total == size)
|
||
{
|
||
if (regular)
|
||
break;
|
||
size *= 2;
|
||
buf = XRESIZEVEC (uchar, buf, size + 16);
|
||
}
|
||
}
|
||
|
||
if (count < 0)
|
||
{
|
||
if (pfile)
|
||
cpp_errno_filename (pfile, CPP_DL_ERROR, file->path, loc);
|
||
free (buf);
|
||
return false;
|
||
}
|
||
|
||
if (pfile && regular && total != size && STAT_SIZE_RELIABLE (file->st))
|
||
cpp_error_at (pfile, CPP_DL_WARNING, loc,
|
||
"%s is shorter than expected", file->path);
|
||
|
||
file->buffer = _cpp_convert_input (pfile,
|
||
input_charset,
|
||
buf, size + 16, total,
|
||
&file->buffer_start,
|
||
&file->st.st_size);
|
||
file->buffer_valid = file->buffer;
|
||
return file->buffer_valid;
|
||
}
|
||
|
||
/* Convenience wrapper around read_file_guts that opens the file if
|
||
necessary and closes the file descriptor after reading. FILE must
|
||
have been passed through find_file() at some stage. Use LOC for
|
||
any diagnostics. Unlike read_file_guts(), PFILE may not be NULL. */
|
||
static bool
|
||
read_file (cpp_reader *pfile, _cpp_file *file, location_t loc)
|
||
{
|
||
/* If we already have its contents in memory, succeed immediately. */
|
||
if (file->buffer_valid)
|
||
return true;
|
||
|
||
/* If an earlier read failed for some reason don't try again. */
|
||
if (file->dont_read || file->err_no)
|
||
return false;
|
||
|
||
if (file->fd == -1 && !open_file (file))
|
||
{
|
||
open_file_failed (pfile, file, 0, loc);
|
||
return false;
|
||
}
|
||
|
||
file->dont_read = !read_file_guts (pfile, file, loc,
|
||
CPP_OPTION (pfile, input_charset));
|
||
close (file->fd);
|
||
file->fd = -1;
|
||
|
||
return !file->dont_read;
|
||
}
|
||
|
||
/* Returns TRUE if FILE is already known to be idempotent, and should
|
||
therefore not be read again. */
|
||
static bool
|
||
is_known_idempotent_file (cpp_reader *pfile, _cpp_file *file, bool import)
|
||
{
|
||
/* Skip once-only files. */
|
||
if (file->once_only)
|
||
return true;
|
||
|
||
/* We must mark the file once-only if #import now, before header
|
||
guard checks. Otherwise, undefining the header guard might
|
||
cause the file to be re-stacked. */
|
||
if (import)
|
||
{
|
||
_cpp_mark_file_once_only (pfile, file);
|
||
|
||
/* Don't stack files that have been stacked before. */
|
||
if (file->stack_count)
|
||
return true;
|
||
}
|
||
|
||
/* Skip if the file had a header guard and the macro is defined.
|
||
PCH relies on this appearing before the PCH handler below. */
|
||
if (file->cmacro && cpp_macro_p (file->cmacro))
|
||
return true;
|
||
|
||
/* Handle PCH files immediately; don't stack them. */
|
||
if (file->pchname)
|
||
{
|
||
pfile->cb.read_pch (pfile, file->pchname, file->fd, file->path);
|
||
file->fd = -1;
|
||
free ((void *) file->pchname);
|
||
file->pchname = NULL;
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/* Return TRUE if file has unique contents, so we should read process
|
||
it. The file's contents must already have been read. */
|
||
|
||
static bool
|
||
has_unique_contents (cpp_reader *pfile, _cpp_file *file, bool import,
|
||
location_t loc)
|
||
{
|
||
/* Check the file against the PCH file. This is done before
|
||
checking against files we've already seen, since it may save on
|
||
I/O. */
|
||
if (check_file_against_entries (pfile, file, import))
|
||
{
|
||
/* If this isn't a #import, but yet we can't include the file,
|
||
that means that it was #import-ed in the PCH file,
|
||
so we can never include it again. */
|
||
if (! import)
|
||
_cpp_mark_file_once_only (pfile, file);
|
||
return false;
|
||
}
|
||
|
||
/* Now we've read the file's contents, we can stack it if there
|
||
are no once-only files. */
|
||
if (!pfile->seen_once_only)
|
||
return true;
|
||
|
||
/* We may have read the file under a different name. Look
|
||
for likely candidates and compare file contents to be sure. */
|
||
for (_cpp_file *f = pfile->all_files; f; f = f->next_file)
|
||
{
|
||
if (f == file)
|
||
continue; /* It'sa me! */
|
||
|
||
if ((import || f->once_only)
|
||
&& f->err_no == 0
|
||
&& f->st.st_mtime == file->st.st_mtime
|
||
&& f->st.st_size == file->st.st_size)
|
||
{
|
||
_cpp_file *ref_file;
|
||
|
||
if (f->buffer && !f->buffer_valid)
|
||
{
|
||
/* We already have a buffer but it is not valid, because
|
||
the file is still stacked. Make a new one. */
|
||
ref_file = make_cpp_file (f->dir, f->name);
|
||
ref_file->path = f->path;
|
||
}
|
||
else
|
||
/* The file is not stacked anymore. We can reuse it. */
|
||
ref_file = f;
|
||
|
||
bool same_file_p = (read_file (pfile, ref_file, loc)
|
||
/* Size might have changed in read_file(). */
|
||
&& ref_file->st.st_size == file->st.st_size
|
||
&& !memcmp (ref_file->buffer, file->buffer,
|
||
file->st.st_size));
|
||
|
||
if (f->buffer && !f->buffer_valid)
|
||
{
|
||
ref_file->path = 0;
|
||
destroy_cpp_file (ref_file);
|
||
}
|
||
|
||
if (same_file_p)
|
||
/* Already seen under a different name. */
|
||
return false;
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Place the file referenced by FILE into a new buffer on the buffer
|
||
stack if possible. Returns true if a buffer is stacked. Use LOC
|
||
for any diagnostics. */
|
||
|
||
bool
|
||
_cpp_stack_file (cpp_reader *pfile, _cpp_file *file, include_type type,
|
||
location_t loc)
|
||
{
|
||
if (is_known_idempotent_file (pfile, file, type == IT_IMPORT))
|
||
return false;
|
||
|
||
int sysp = 0;
|
||
char *buf = nullptr;
|
||
|
||
/* Check C++ module include translation. */
|
||
if (!file->header_unit && type < IT_HEADER_HWM
|
||
/* Do not include translate include-next. */
|
||
&& type != IT_INCLUDE_NEXT
|
||
&& pfile->cb.translate_include)
|
||
buf = (pfile->cb.translate_include
|
||
(pfile, pfile->line_table, loc, file->path));
|
||
|
||
if (buf)
|
||
{
|
||
/* We don't increment the line number at the end of a buffer,
|
||
because we don't usually need that location (we're popping an
|
||
include file). However in this case we do want to do the
|
||
increment. So push a writable buffer of two newlines to acheive
|
||
that. (We also need an extra newline, so this looks like a regular
|
||
file, which we do that to to make sure we don't fall off the end in the
|
||
middle of a line. */
|
||
static uchar newlines[] = "\n\n\n";
|
||
cpp_push_buffer (pfile, newlines, 2, true);
|
||
|
||
size_t len = strlen (buf);
|
||
buf[len] = '\n'; /* See above */
|
||
cpp_buffer *buffer
|
||
= cpp_push_buffer (pfile, reinterpret_cast<unsigned char *> (buf),
|
||
len, true);
|
||
buffer->to_free = buffer->buf;
|
||
|
||
file->header_unit = +1;
|
||
_cpp_mark_file_once_only (pfile, file);
|
||
}
|
||
else
|
||
{
|
||
/* Not a header unit, and we know it. */
|
||
file->header_unit = -1;
|
||
|
||
if (!read_file (pfile, file, loc))
|
||
return false;
|
||
|
||
if (!has_unique_contents (pfile, file, type == IT_IMPORT, loc))
|
||
return false;
|
||
|
||
if (pfile->buffer && file->dir)
|
||
sysp = MAX (pfile->buffer->sysp, file->dir->sysp);
|
||
|
||
/* Add the file to the dependencies on its first inclusion. */
|
||
if (CPP_OPTION (pfile, deps.style) > (sysp != 0)
|
||
&& !file->stack_count
|
||
&& file->path[0]
|
||
&& !(pfile->main_file == file
|
||
&& CPP_OPTION (pfile, deps.ignore_main_file)))
|
||
deps_add_dep (pfile->deps, file->path);
|
||
|
||
/* Clear buffer_valid since _cpp_clean_line messes it up. */
|
||
file->buffer_valid = false;
|
||
file->stack_count++;
|
||
|
||
/* Stack the buffer. */
|
||
cpp_buffer *buffer
|
||
= cpp_push_buffer (pfile, file->buffer, file->st.st_size,
|
||
CPP_OPTION (pfile, preprocessed)
|
||
&& !CPP_OPTION (pfile, directives_only));
|
||
buffer->file = file;
|
||
buffer->sysp = sysp;
|
||
buffer->to_free = file->buffer_start;
|
||
|
||
/* Initialize controlling macro state. */
|
||
pfile->mi_valid = true;
|
||
pfile->mi_cmacro = 0;
|
||
}
|
||
|
||
/* In the case of a normal #include, we're now at the start of the
|
||
line *following* the #include. A separate location_t for this
|
||
location makes no sense, until we do the LC_LEAVE.
|
||
|
||
This does not apply if we found a PCH file, we're not a regular
|
||
include, or we ran out of locations. */
|
||
bool decrement = (file->pchname == NULL
|
||
&& type < IT_DIRECTIVE_HWM
|
||
&& (pfile->line_table->highest_location
|
||
!= LINE_MAP_MAX_LOCATION - 1));
|
||
if (decrement)
|
||
pfile->line_table->highest_location--;
|
||
|
||
if (file->header_unit <= 0)
|
||
/* Add line map and do callbacks. */
|
||
_cpp_do_file_change (pfile, LC_ENTER, file->path,
|
||
/* With preamble injection, start on line zero,
|
||
so the preamble doesn't appear to have been
|
||
included from line 1. Likewise when
|
||
starting preprocessed, we expect an initial
|
||
locating line. */
|
||
type == IT_PRE_MAIN ? 0 : 1, sysp);
|
||
else if (decrement)
|
||
{
|
||
/* Adjust the line back one so we appear on the #include line itself. */
|
||
const line_map_ordinary *map
|
||
= LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table);
|
||
linenum_type line = SOURCE_LINE (map, pfile->line_table->highest_line);
|
||
linemap_line_start (pfile->line_table, line - 1, 0);
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Mark FILE to be included once only. */
|
||
void
|
||
_cpp_mark_file_once_only (cpp_reader *pfile, _cpp_file *file)
|
||
{
|
||
pfile->seen_once_only = true;
|
||
file->once_only = true;
|
||
}
|
||
|
||
/* Return the directory from which searching for FNAME should start,
|
||
considering the directive TYPE and ANGLE_BRACKETS. If there is
|
||
nothing left in the path, returns NULL. */
|
||
static struct cpp_dir *
|
||
search_path_head (cpp_reader *pfile, const char *fname, int angle_brackets,
|
||
enum include_type type)
|
||
{
|
||
cpp_dir *dir;
|
||
_cpp_file *file;
|
||
|
||
if (IS_ABSOLUTE_PATH (fname))
|
||
return &pfile->no_search_path;
|
||
|
||
/* pfile->buffer is NULL when processing an -include command-line flag. */
|
||
file = pfile->buffer == NULL ? pfile->main_file : pfile->buffer->file;
|
||
|
||
/* For #include_next, skip in the search path past the dir in which
|
||
the current file was found, but if it was found via an absolute
|
||
path use the normal search logic. */
|
||
if (type == IT_INCLUDE_NEXT && file->dir
|
||
&& file->dir != &pfile->no_search_path)
|
||
dir = file->dir->next;
|
||
else if (angle_brackets)
|
||
dir = pfile->bracket_include;
|
||
else if (type == IT_CMDLINE)
|
||
/* -include and -imacros use the #include "" chain with the
|
||
preprocessor's cwd prepended. */
|
||
return make_cpp_dir (pfile, "./", false);
|
||
else if (pfile->quote_ignores_source_dir)
|
||
dir = pfile->quote_include;
|
||
else
|
||
return make_cpp_dir (pfile, dir_name_of_file (file),
|
||
pfile->buffer ? pfile->buffer->sysp : 0);
|
||
|
||
if (dir == NULL)
|
||
cpp_error (pfile, CPP_DL_ERROR,
|
||
"no include path in which to search for %s", fname);
|
||
|
||
return dir;
|
||
}
|
||
|
||
/* Strip the basename from the file's path. It ends with a slash if
|
||
of nonzero length. Note that this procedure also works for
|
||
<stdin>, which is represented by the empty string. */
|
||
static const char *
|
||
dir_name_of_file (_cpp_file *file)
|
||
{
|
||
if (!file->dir_name)
|
||
{
|
||
size_t len = lbasename (file->path) - file->path;
|
||
char *dir_name = XNEWVEC (char, len + 1);
|
||
|
||
memcpy (dir_name, file->path, len);
|
||
dir_name[len] = '\0';
|
||
file->dir_name = dir_name;
|
||
}
|
||
|
||
return file->dir_name;
|
||
}
|
||
|
||
/* Handles #include-family directives (distinguished by TYPE),
|
||
including HEADER, and the command line -imacros and -include.
|
||
Returns true if a buffer was stacked. */
|
||
bool
|
||
_cpp_stack_include (cpp_reader *pfile, const char *fname, int angle_brackets,
|
||
enum include_type type, location_t loc)
|
||
{
|
||
/* For -include command-line flags we have type == IT_CMDLINE.
|
||
When the first -include file is processed we have the case, where
|
||
pfile->cur_token == pfile->cur_run->base, we are directly called up
|
||
by the front end. However in the case of the second -include file,
|
||
we are called from _cpp_lex_token -> _cpp_get_fresh_line ->
|
||
cpp_push_include, with pfile->cur_token != pfile->cur_run->base,
|
||
and pfile->cur_token[-1].src_loc not (yet) initialized.
|
||
However, when the include file cannot be found, we need src_loc to
|
||
be initialized to some safe value: 0 means UNKNOWN_LOCATION. */
|
||
if (type == IT_CMDLINE && pfile->cur_token != pfile->cur_run->base)
|
||
pfile->cur_token[-1].src_loc = 0;
|
||
|
||
cpp_dir *dir = search_path_head (pfile, fname, angle_brackets, type);
|
||
if (!dir)
|
||
return false;
|
||
|
||
_cpp_file *file = _cpp_find_file (pfile, fname, dir, angle_brackets,
|
||
type == IT_DEFAULT ? _cpp_FFK_PRE_INCLUDE
|
||
: _cpp_FFK_NORMAL, loc);
|
||
if (type == IT_DEFAULT && file == NULL)
|
||
return false;
|
||
|
||
return _cpp_stack_file (pfile, file, type, loc);
|
||
}
|
||
|
||
/* NAME is a header file name, find the _cpp_file, if any. */
|
||
|
||
static _cpp_file *
|
||
test_header_unit (cpp_reader *pfile, const char *name, bool angle,
|
||
location_t loc)
|
||
{
|
||
if (cpp_dir *dir = search_path_head (pfile, name, angle, IT_INCLUDE))
|
||
return _cpp_find_file (pfile, name, dir, angle, _cpp_FFK_NORMAL, loc);
|
||
|
||
return nullptr;
|
||
}
|
||
|
||
/* NAME is a header file name, find the path we'll use to open it and infer that
|
||
it is a header-unit. */
|
||
|
||
const char *
|
||
_cpp_find_header_unit (cpp_reader *pfile, const char *name, bool angle,
|
||
location_t loc)
|
||
{
|
||
if (_cpp_file *file = test_header_unit (pfile, name, angle, loc))
|
||
{
|
||
if (file->fd > 0)
|
||
{
|
||
/* Don't leave it open. */
|
||
close (file->fd);
|
||
file->fd = 0;
|
||
}
|
||
|
||
file->header_unit = +1;
|
||
_cpp_mark_file_once_only (pfile, file);
|
||
|
||
return file->path;
|
||
}
|
||
|
||
return nullptr;
|
||
}
|
||
|
||
/* NAME is a header file name, find the path we'll use to open it. But do not
|
||
infer it is a header unit. */
|
||
|
||
const char *
|
||
cpp_probe_header_unit (cpp_reader *pfile, const char *name, bool angle,
|
||
location_t loc)
|
||
{
|
||
if (_cpp_file *file = test_header_unit (pfile, name, angle, loc))
|
||
return file->path;
|
||
|
||
return nullptr;
|
||
}
|
||
|
||
/* Retrofit the just-entered main file asif it was an include. This
|
||
will permit correct include_next use, and mark it as a system
|
||
header if that's where it resides. We use filesystem-appropriate
|
||
prefix matching of the include path to locate the main file. */
|
||
void
|
||
cpp_retrofit_as_include (cpp_reader *pfile)
|
||
{
|
||
/* We should be the outermost. */
|
||
gcc_assert (!pfile->buffer->prev);
|
||
|
||
if (const char *name = pfile->main_file->name)
|
||
{
|
||
/* Locate name on the include dir path, using a prefix match. */
|
||
size_t name_len = strlen (name);
|
||
for (cpp_dir *dir = pfile->quote_include; dir; dir = dir->next)
|
||
if (dir->len < name_len
|
||
&& IS_DIR_SEPARATOR (name[dir->len])
|
||
&& !filename_ncmp (name, dir->name, dir->len))
|
||
{
|
||
pfile->main_file->dir = dir;
|
||
if (dir->sysp)
|
||
cpp_make_system_header (pfile, 1, 0);
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Initialize controlling macro state. */
|
||
pfile->mi_valid = true;
|
||
pfile->mi_cmacro = 0;
|
||
}
|
||
|
||
/* Could not open FILE. The complication is dependency output. */
|
||
static void
|
||
open_file_failed (cpp_reader *pfile, _cpp_file *file, int angle_brackets,
|
||
location_t loc)
|
||
{
|
||
int sysp = pfile->line_table->highest_line > 1 && pfile->buffer ? pfile->buffer->sysp : 0;
|
||
bool print_dep = CPP_OPTION (pfile, deps.style) > (angle_brackets || !!sysp);
|
||
|
||
errno = file->err_no;
|
||
if (print_dep && CPP_OPTION (pfile, deps.missing_files) && errno == ENOENT)
|
||
{
|
||
deps_add_dep (pfile->deps, file->name);
|
||
/* If the preprocessor output (other than dependency information) is
|
||
being used, we must also flag an error. */
|
||
if (CPP_OPTION (pfile, deps.need_preprocessor_output))
|
||
cpp_errno_filename (pfile, CPP_DL_FATAL,
|
||
file->path ? file->path : file->name,
|
||
loc);
|
||
}
|
||
else
|
||
{
|
||
/* If we are not outputting dependencies, or if we are and dependencies
|
||
were requested for this file, or if preprocessor output is needed
|
||
in addition to dependency information, this is an error.
|
||
|
||
Otherwise (outputting dependencies but not for this file, and not
|
||
using the preprocessor output), we can still produce correct output
|
||
so it's only a warning. */
|
||
if (CPP_OPTION (pfile, deps.style) == DEPS_NONE
|
||
|| print_dep
|
||
|| CPP_OPTION (pfile, deps.need_preprocessor_output))
|
||
cpp_errno_filename (pfile, CPP_DL_FATAL,
|
||
file->path ? file->path : file->name,
|
||
loc);
|
||
else
|
||
cpp_errno_filename (pfile, CPP_DL_WARNING,
|
||
file->path ? file->path : file->name,
|
||
loc);
|
||
}
|
||
}
|
||
|
||
/* Search in the chain beginning at HEAD for a file whose search path
|
||
started at START_DIR != NULL. */
|
||
static struct cpp_file_hash_entry *
|
||
search_cache (struct cpp_file_hash_entry *head, const cpp_dir *start_dir)
|
||
{
|
||
while (head && head->start_dir != start_dir)
|
||
head = head->next;
|
||
|
||
return head;
|
||
}
|
||
|
||
/* Allocate a new _cpp_file structure. */
|
||
static _cpp_file *
|
||
make_cpp_file (cpp_dir *dir, const char *fname)
|
||
{
|
||
_cpp_file *file = XCNEW (_cpp_file);
|
||
file->fd = -1;
|
||
file->dir = dir;
|
||
file->name = xstrdup (fname);
|
||
|
||
return file;
|
||
}
|
||
|
||
/* Release a _cpp_file structure. */
|
||
static void
|
||
destroy_cpp_file (_cpp_file *file)
|
||
{
|
||
free ((void *) file->buffer_start);
|
||
free ((void *) file->name);
|
||
free ((void *) file->path);
|
||
free (file);
|
||
}
|
||
|
||
/* Release all the files allocated by this reader. */
|
||
static void
|
||
destroy_all_cpp_files (cpp_reader *pfile)
|
||
{
|
||
_cpp_file *iter = pfile->all_files;
|
||
while (iter)
|
||
{
|
||
_cpp_file *next = iter->next_file;
|
||
destroy_cpp_file (iter);
|
||
iter = next;
|
||
}
|
||
}
|
||
|
||
/* A hash of directory names. The directory names are the path names
|
||
of files which contain a #include "", the included file name is
|
||
appended to this directories.
|
||
|
||
To avoid duplicate entries we follow the convention that all
|
||
non-empty directory names should end in a '/'. DIR_NAME must be
|
||
stored in permanently allocated memory. */
|
||
static cpp_dir *
|
||
make_cpp_dir (cpp_reader *pfile, const char *dir_name, int sysp)
|
||
{
|
||
struct cpp_file_hash_entry *entry, **hash_slot;
|
||
cpp_dir *dir;
|
||
|
||
hash_slot = (struct cpp_file_hash_entry **)
|
||
htab_find_slot_with_hash (pfile->dir_hash, dir_name,
|
||
htab_hash_string (dir_name),
|
||
INSERT);
|
||
|
||
/* Have we already hashed this directory? */
|
||
for (entry = *hash_slot; entry; entry = entry->next)
|
||
if (entry->start_dir == NULL)
|
||
return entry->u.dir;
|
||
|
||
dir = XCNEW (cpp_dir);
|
||
dir->next = pfile->quote_include;
|
||
dir->name = (char *) dir_name;
|
||
dir->len = strlen (dir_name);
|
||
dir->sysp = sysp;
|
||
dir->construct = 0;
|
||
|
||
/* Store this new result in the hash table. */
|
||
entry = new_file_hash_entry (pfile);
|
||
entry->next = *hash_slot;
|
||
entry->start_dir = NULL;
|
||
entry->location = pfile->line_table->highest_location;
|
||
entry->u.dir = dir;
|
||
*hash_slot = entry;
|
||
|
||
return dir;
|
||
}
|
||
|
||
/* Create a new block of memory for file hash entries. */
|
||
static void
|
||
allocate_file_hash_entries (cpp_reader *pfile)
|
||
{
|
||
struct file_hash_entry_pool *pool = XNEW (struct file_hash_entry_pool);
|
||
pool->file_hash_entries_used = 0;
|
||
pool->next = pfile->file_hash_entries;
|
||
pfile->file_hash_entries = pool;
|
||
}
|
||
|
||
/* Return a new file hash entry. */
|
||
static struct cpp_file_hash_entry *
|
||
new_file_hash_entry (cpp_reader *pfile)
|
||
{
|
||
unsigned int idx;
|
||
if (pfile->file_hash_entries->file_hash_entries_used == FILE_HASH_POOL_SIZE)
|
||
allocate_file_hash_entries (pfile);
|
||
|
||
idx = pfile->file_hash_entries->file_hash_entries_used++;
|
||
return &pfile->file_hash_entries->pool[idx];
|
||
}
|
||
|
||
/* Free the file hash entry pools. */
|
||
static void
|
||
free_file_hash_entries (cpp_reader *pfile)
|
||
{
|
||
struct file_hash_entry_pool *iter = pfile->file_hash_entries;
|
||
while (iter)
|
||
{
|
||
struct file_hash_entry_pool *next = iter->next;
|
||
free (iter);
|
||
iter = next;
|
||
}
|
||
}
|
||
|
||
/* Returns TRUE if a file FNAME has ever been successfully opened.
|
||
This routine is not intended to correctly handle filenames aliased
|
||
by links or redundant . or .. traversals etc. */
|
||
bool
|
||
cpp_included (cpp_reader *pfile, const char *fname)
|
||
{
|
||
struct cpp_file_hash_entry *entry;
|
||
|
||
entry = (struct cpp_file_hash_entry *)
|
||
htab_find_with_hash (pfile->file_hash, fname, htab_hash_string (fname));
|
||
|
||
while (entry && (entry->start_dir == NULL || entry->u.file->err_no))
|
||
entry = entry->next;
|
||
|
||
return entry != NULL;
|
||
}
|
||
|
||
/* Returns TRUE if a file FNAME has ever been successfully opened
|
||
before LOCATION. This routine is not intended to correctly handle
|
||
filenames aliased by links or redundant . or .. traversals etc. */
|
||
bool
|
||
cpp_included_before (cpp_reader *pfile, const char *fname,
|
||
location_t location)
|
||
{
|
||
struct cpp_file_hash_entry *entry
|
||
= (struct cpp_file_hash_entry *)
|
||
htab_find_with_hash (pfile->file_hash, fname, htab_hash_string (fname));
|
||
|
||
if (IS_ADHOC_LOC (location))
|
||
location = get_location_from_adhoc_loc (pfile->line_table, location);
|
||
|
||
while (entry && (entry->start_dir == NULL || entry->u.file->err_no
|
||
|| entry->location > location))
|
||
entry = entry->next;
|
||
|
||
return entry != NULL;
|
||
}
|
||
|
||
/* Calculate the hash value of a file hash entry P. */
|
||
|
||
static hashval_t
|
||
file_hash_hash (const void *p)
|
||
{
|
||
struct cpp_file_hash_entry *entry = (struct cpp_file_hash_entry *) p;
|
||
const char *hname;
|
||
if (entry->start_dir)
|
||
hname = entry->u.file->name;
|
||
else
|
||
hname = entry->u.dir->name;
|
||
|
||
return htab_hash_string (hname);
|
||
}
|
||
|
||
/* Compare a string Q against a file hash entry P. */
|
||
static int
|
||
file_hash_eq (const void *p, const void *q)
|
||
{
|
||
struct cpp_file_hash_entry *entry = (struct cpp_file_hash_entry *) p;
|
||
const char *fname = (const char *) q;
|
||
const char *hname;
|
||
|
||
if (entry->start_dir)
|
||
hname = entry->u.file->name;
|
||
else
|
||
hname = entry->u.dir->name;
|
||
|
||
return filename_cmp (hname, fname) == 0;
|
||
}
|
||
|
||
/* Compare entries in the nonexistent file hash table. These are just
|
||
strings. */
|
||
static int
|
||
nonexistent_file_hash_eq (const void *p, const void *q)
|
||
{
|
||
return filename_cmp ((const char *) p, (const char *) q) == 0;
|
||
}
|
||
|
||
/* Initialize everything in this source file. */
|
||
void
|
||
_cpp_init_files (cpp_reader *pfile)
|
||
{
|
||
pfile->file_hash = htab_create_alloc (127, file_hash_hash, file_hash_eq,
|
||
NULL, xcalloc, free);
|
||
pfile->dir_hash = htab_create_alloc (127, file_hash_hash, file_hash_eq,
|
||
NULL, xcalloc, free);
|
||
allocate_file_hash_entries (pfile);
|
||
pfile->nonexistent_file_hash = htab_create_alloc (127, htab_hash_string,
|
||
nonexistent_file_hash_eq,
|
||
NULL, xcalloc, free);
|
||
obstack_specify_allocation (&pfile->nonexistent_file_ob, 0, 0,
|
||
xmalloc, free);
|
||
}
|
||
|
||
/* Finalize everything in this source file. */
|
||
void
|
||
_cpp_cleanup_files (cpp_reader *pfile)
|
||
{
|
||
htab_delete (pfile->file_hash);
|
||
htab_delete (pfile->dir_hash);
|
||
htab_delete (pfile->nonexistent_file_hash);
|
||
obstack_free (&pfile->nonexistent_file_ob, 0);
|
||
free_file_hash_entries (pfile);
|
||
destroy_all_cpp_files (pfile);
|
||
}
|
||
|
||
/* Make the parser forget about files it has seen. This can be useful
|
||
for resetting the parser to start another run. */
|
||
void
|
||
cpp_clear_file_cache (cpp_reader *pfile)
|
||
{
|
||
_cpp_cleanup_files (pfile);
|
||
pfile->file_hash_entries = NULL;
|
||
pfile->all_files = NULL;
|
||
_cpp_init_files (pfile);
|
||
}
|
||
|
||
/* Enter a file name in the hash for the sake of cpp_included. */
|
||
void
|
||
_cpp_fake_include (cpp_reader *pfile, const char *fname)
|
||
{
|
||
_cpp_find_file (pfile, fname, pfile->buffer->file->dir, 0, _cpp_FFK_FAKE, 0);
|
||
}
|
||
|
||
/* Not everyone who wants to set system-header-ness on a buffer can
|
||
see the details of a buffer. This is an exported interface because
|
||
fix-header needs it. */
|
||
void
|
||
cpp_make_system_header (cpp_reader *pfile, int syshdr, int externc)
|
||
{
|
||
int flags = 0;
|
||
const class line_maps *line_table = pfile->line_table;
|
||
const line_map_ordinary *map = LINEMAPS_LAST_ORDINARY_MAP (line_table);
|
||
/* 1 = system header, 2 = system header to be treated as C. */
|
||
if (syshdr)
|
||
flags = 1 + (externc != 0);
|
||
pfile->buffer->sysp = flags;
|
||
_cpp_do_file_change (pfile, LC_RENAME, ORDINARY_MAP_FILE_NAME (map),
|
||
SOURCE_LINE (map, pfile->line_table->highest_line),
|
||
flags);
|
||
}
|
||
|
||
/* Allow the client to change the current file. Used by the front end
|
||
to achieve pseudo-file names like <built-in>.
|
||
If REASON is LC_LEAVE, then NEW_NAME must be NULL. */
|
||
void
|
||
cpp_change_file (cpp_reader *pfile, enum lc_reason reason,
|
||
const char *new_name)
|
||
{
|
||
_cpp_do_file_change (pfile, reason, new_name, 1, 0);
|
||
}
|
||
|
||
struct report_missing_guard_data
|
||
{
|
||
cpp_reader *pfile;
|
||
const char **paths;
|
||
size_t count;
|
||
};
|
||
|
||
/* Callback function for htab_traverse. */
|
||
static int
|
||
report_missing_guard (void **slot, void *d)
|
||
{
|
||
struct cpp_file_hash_entry *entry = (struct cpp_file_hash_entry *) *slot;
|
||
struct report_missing_guard_data *data
|
||
= (struct report_missing_guard_data *) d;
|
||
|
||
/* Skip directories. */
|
||
if (entry->start_dir != NULL)
|
||
{
|
||
_cpp_file *file = entry->u.file;
|
||
|
||
/* We don't want MI guard advice for the main file. */
|
||
if (!file->once_only
|
||
&& file->cmacro == NULL
|
||
&& file->stack_count == 1
|
||
&& data->pfile->main_file != file)
|
||
{
|
||
if (data->paths == NULL)
|
||
{
|
||
data->paths = XCNEWVEC (const char *, data->count);
|
||
data->count = 0;
|
||
}
|
||
|
||
data->paths[data->count++] = file->path;
|
||
}
|
||
}
|
||
|
||
/* Keep traversing the hash table. */
|
||
return 1;
|
||
}
|
||
|
||
/* Comparison function for qsort. */
|
||
static int
|
||
report_missing_guard_cmp (const void *p1, const void *p2)
|
||
{
|
||
return strcmp (*(const char *const *) p1, *(const char *const *) p2);
|
||
}
|
||
|
||
/* Report on all files that might benefit from a multiple include guard.
|
||
Triggered by -H. */
|
||
void
|
||
_cpp_report_missing_guards (cpp_reader *pfile)
|
||
{
|
||
struct report_missing_guard_data data;
|
||
|
||
data.pfile = pfile;
|
||
data.paths = NULL;
|
||
data.count = htab_elements (pfile->file_hash);
|
||
htab_traverse (pfile->file_hash, report_missing_guard, &data);
|
||
|
||
if (data.paths != NULL)
|
||
{
|
||
size_t i;
|
||
|
||
/* Sort the paths to avoid outputting them in hash table
|
||
order. */
|
||
qsort (data.paths, data.count, sizeof (const char *),
|
||
report_missing_guard_cmp);
|
||
fputs (_("Multiple include guards may be useful for:\n"),
|
||
stderr);
|
||
for (i = 0; i < data.count; i++)
|
||
{
|
||
fputs (data.paths[i], stderr);
|
||
putc ('\n', stderr);
|
||
}
|
||
free (data.paths);
|
||
}
|
||
}
|
||
|
||
/* Locate HEADER, and determine whether it is newer than the current
|
||
file. If it cannot be located or dated, return -1, if it is
|
||
newer, return 1, otherwise 0. */
|
||
int
|
||
_cpp_compare_file_date (cpp_reader *pfile, const char *fname,
|
||
int angle_brackets)
|
||
{
|
||
_cpp_file *file;
|
||
struct cpp_dir *dir;
|
||
|
||
dir = search_path_head (pfile, fname, angle_brackets, IT_INCLUDE);
|
||
if (!dir)
|
||
return -1;
|
||
|
||
file = _cpp_find_file (pfile, fname, dir, angle_brackets, _cpp_FFK_NORMAL, 0);
|
||
if (file->err_no)
|
||
return -1;
|
||
|
||
if (file->fd != -1)
|
||
{
|
||
close (file->fd);
|
||
file->fd = -1;
|
||
}
|
||
|
||
return file->st.st_mtime > pfile->buffer->file->st.st_mtime;
|
||
}
|
||
|
||
/* Pushes the given file onto the buffer stack. Returns nonzero if
|
||
successful. */
|
||
bool
|
||
cpp_push_include (cpp_reader *pfile, const char *fname)
|
||
{
|
||
return _cpp_stack_include (pfile, fname, false, IT_CMDLINE,
|
||
pfile->line_table->highest_line);
|
||
}
|
||
|
||
/* Pushes the given file, implicitly included at the start of a
|
||
compilation, onto the buffer stack but without any errors if the
|
||
file is not found. Returns nonzero if successful. */
|
||
bool
|
||
cpp_push_default_include (cpp_reader *pfile, const char *fname)
|
||
{
|
||
return _cpp_stack_include (pfile, fname, true, IT_DEFAULT,
|
||
pfile->line_table->highest_line);
|
||
}
|
||
|
||
/* Do appropriate cleanup when a file INC's buffer is popped off the
|
||
input stack. */
|
||
void
|
||
_cpp_pop_file_buffer (cpp_reader *pfile, _cpp_file *file,
|
||
const unsigned char *to_free)
|
||
{
|
||
/* Record the inclusion-preventing macro, which could be NULL
|
||
meaning no controlling macro. */
|
||
if (pfile->mi_valid && file->cmacro == NULL)
|
||
file->cmacro = pfile->mi_cmacro;
|
||
|
||
/* Invalidate control macros in the #including file. */
|
||
pfile->mi_valid = false;
|
||
|
||
if (to_free)
|
||
{
|
||
if (to_free == file->buffer_start)
|
||
{
|
||
file->buffer_start = NULL;
|
||
file->buffer = NULL;
|
||
file->buffer_valid = false;
|
||
}
|
||
free ((void *) to_free);
|
||
}
|
||
}
|
||
|
||
/* Return the file name associated with FILE. */
|
||
const char *
|
||
_cpp_get_file_name (_cpp_file *file)
|
||
{
|
||
return file->name;
|
||
}
|
||
|
||
/* Inteface to file statistics record in _cpp_file structure. */
|
||
struct stat *
|
||
_cpp_get_file_stat (_cpp_file *file)
|
||
{
|
||
return &file->st;
|
||
}
|
||
|
||
/* Set the include chain for "" to QUOTE, for <> to BRACKET. If
|
||
QUOTE_IGNORES_SOURCE_DIR, then "" includes do not look in the
|
||
directory of the including file.
|
||
|
||
If BRACKET does not lie in the QUOTE chain, it is set to QUOTE. */
|
||
void
|
||
cpp_set_include_chains (cpp_reader *pfile, cpp_dir *quote, cpp_dir *bracket,
|
||
int quote_ignores_source_dir)
|
||
{
|
||
pfile->quote_include = quote;
|
||
pfile->bracket_include = quote;
|
||
pfile->quote_ignores_source_dir = quote_ignores_source_dir;
|
||
|
||
for (; quote; quote = quote->next)
|
||
{
|
||
quote->name_map = NULL;
|
||
quote->len = strlen (quote->name);
|
||
if (quote == bracket)
|
||
pfile->bracket_include = bracket;
|
||
}
|
||
}
|
||
|
||
/* Append the file name to the directory to create the path, but don't
|
||
turn / into // or // into ///; // may be a namespace escape. */
|
||
static char *
|
||
append_file_to_dir (const char *fname, cpp_dir *dir)
|
||
{
|
||
size_t dlen, flen;
|
||
char *path;
|
||
|
||
dlen = dir->len;
|
||
flen = strlen (fname);
|
||
path = XNEWVEC (char, dlen + 1 + flen + 1);
|
||
memcpy (path, dir->name, dlen);
|
||
if (dlen && !IS_DIR_SEPARATOR (path[dlen - 1]))
|
||
path[dlen++] = '/';
|
||
memcpy (&path[dlen], fname, flen + 1);
|
||
|
||
return path;
|
||
}
|
||
|
||
/* Read a space delimited string of unlimited length from a stdio
|
||
file F. */
|
||
static char *
|
||
read_filename_string (int ch, FILE *f)
|
||
{
|
||
char *alloc, *set;
|
||
int len;
|
||
|
||
len = 20;
|
||
set = alloc = XNEWVEC (char, len + 1);
|
||
if (! is_space (ch))
|
||
{
|
||
*set++ = ch;
|
||
while ((ch = getc (f)) != EOF && ! is_space (ch))
|
||
{
|
||
if (set - alloc == len)
|
||
{
|
||
len *= 2;
|
||
alloc = XRESIZEVEC (char, alloc, len + 1);
|
||
set = alloc + len / 2;
|
||
}
|
||
*set++ = ch;
|
||
}
|
||
}
|
||
*set = '\0';
|
||
ungetc (ch, f);
|
||
return alloc;
|
||
}
|
||
|
||
/* Read the file name map file for DIR. */
|
||
static void
|
||
read_name_map (cpp_dir *dir)
|
||
{
|
||
static const char FILE_NAME_MAP_FILE[] = "header.gcc";
|
||
char *name;
|
||
FILE *f;
|
||
size_t len, count = 0, room = 9;
|
||
|
||
len = dir->len;
|
||
name = (char *) alloca (len + sizeof (FILE_NAME_MAP_FILE) + 1);
|
||
memcpy (name, dir->name, len);
|
||
if (len && !IS_DIR_SEPARATOR (name[len - 1]))
|
||
name[len++] = '/';
|
||
strcpy (name + len, FILE_NAME_MAP_FILE);
|
||
f = fopen (name, "r");
|
||
|
||
dir->name_map = XNEWVEC (const char *, room);
|
||
|
||
/* Silently return NULL if we cannot open. */
|
||
if (f)
|
||
{
|
||
int ch;
|
||
|
||
while ((ch = getc (f)) != EOF)
|
||
{
|
||
char *to;
|
||
|
||
if (is_space (ch))
|
||
continue;
|
||
|
||
if (count + 2 > room)
|
||
{
|
||
room += 8;
|
||
dir->name_map = XRESIZEVEC (const char *, dir->name_map, room);
|
||
}
|
||
|
||
dir->name_map[count] = read_filename_string (ch, f);
|
||
while ((ch = getc (f)) != EOF && is_hspace (ch))
|
||
;
|
||
|
||
to = read_filename_string (ch, f);
|
||
if (IS_ABSOLUTE_PATH (to))
|
||
dir->name_map[count + 1] = to;
|
||
else
|
||
{
|
||
dir->name_map[count + 1] = append_file_to_dir (to, dir);
|
||
free (to);
|
||
}
|
||
|
||
count += 2;
|
||
while ((ch = getc (f)) != '\n')
|
||
if (ch == EOF)
|
||
break;
|
||
}
|
||
|
||
fclose (f);
|
||
}
|
||
|
||
/* Terminate the list of maps. */
|
||
dir->name_map[count] = NULL;
|
||
}
|
||
|
||
/* Remap a FILE's name based on the file_name_map, if any, for
|
||
FILE->dir. If the file name has any directory separators,
|
||
recursively check those directories too. */
|
||
static char *
|
||
remap_filename (cpp_reader *pfile, _cpp_file *file)
|
||
{
|
||
const char *fname, *p;
|
||
char *new_dir, *p3;
|
||
cpp_dir *dir;
|
||
size_t index, len;
|
||
|
||
dir = file->dir;
|
||
fname = file->name;
|
||
|
||
for (;;)
|
||
{
|
||
if (!dir->name_map)
|
||
read_name_map (dir);
|
||
|
||
for (index = 0; dir->name_map[index]; index += 2)
|
||
if (!filename_cmp (dir->name_map[index], fname))
|
||
return xstrdup (dir->name_map[index + 1]);
|
||
if (IS_ABSOLUTE_PATH (fname))
|
||
return NULL;
|
||
p = strchr (fname, '/');
|
||
#ifdef HAVE_DOS_BASED_FILE_SYSTEM
|
||
{
|
||
const char *p2 = strchr (fname, '\\');
|
||
if (!p || (p2 && p > p2))
|
||
p = p2;
|
||
}
|
||
#endif
|
||
if (!p || p == fname)
|
||
return NULL;
|
||
|
||
len = dir->len + (p - fname + 1);
|
||
new_dir = XNEWVEC (char, len + 2);
|
||
p3 = new_dir + dir->len;
|
||
memcpy (new_dir, dir->name, dir->len);
|
||
if (dir->len && !IS_DIR_SEPARATOR (dir->name[dir->len - 1]))
|
||
{
|
||
*p3++ = '/';
|
||
len++;
|
||
}
|
||
memcpy (p3, fname, p - fname + 1);
|
||
new_dir[len] = '\0';
|
||
|
||
dir = make_cpp_dir (pfile, new_dir, dir->sysp);
|
||
fname = p + 1;
|
||
}
|
||
}
|
||
|
||
/* Returns true if PCHNAME is a valid PCH file for FILE. */
|
||
static bool
|
||
validate_pch (cpp_reader *pfile, _cpp_file *file, const char *pchname)
|
||
{
|
||
const char *saved_path = file->path;
|
||
bool valid = false;
|
||
|
||
file->path = pchname;
|
||
if (open_file (file))
|
||
{
|
||
valid = 1 & pfile->cb.valid_pch (pfile, pchname, file->fd);
|
||
|
||
if (!valid)
|
||
{
|
||
close (file->fd);
|
||
file->fd = -1;
|
||
}
|
||
|
||
if (CPP_OPTION (pfile, print_include_names))
|
||
{
|
||
unsigned int i;
|
||
for (i = 1; i < pfile->line_table->depth; i++)
|
||
putc ('.', stderr);
|
||
fprintf (stderr, "%c %s\n",
|
||
valid ? '!' : 'x', pchname);
|
||
}
|
||
}
|
||
|
||
file->path = saved_path;
|
||
return valid;
|
||
}
|
||
|
||
/* Get the path associated with the _cpp_file F. The path includes
|
||
the base name from the include directive and the directory it was
|
||
found in via the search path. */
|
||
|
||
const char *
|
||
cpp_get_path (struct _cpp_file *f)
|
||
{
|
||
return f->path;
|
||
}
|
||
|
||
/* Get the directory associated with the _cpp_file F. */
|
||
|
||
cpp_dir *
|
||
cpp_get_dir (struct _cpp_file *f)
|
||
{
|
||
return f->dir;
|
||
}
|
||
|
||
/* Get the cpp_buffer currently associated with the cpp_reader
|
||
PFILE. */
|
||
|
||
cpp_buffer *
|
||
cpp_get_buffer (cpp_reader *pfile)
|
||
{
|
||
return pfile->buffer;
|
||
}
|
||
|
||
/* Get the _cpp_file associated with the cpp_buffer B. */
|
||
|
||
_cpp_file *
|
||
cpp_get_file (cpp_buffer *b)
|
||
{
|
||
return b->file;
|
||
}
|
||
|
||
/* Get the previous cpp_buffer given a cpp_buffer B. The previous
|
||
buffer is the buffer that included the given buffer. */
|
||
|
||
cpp_buffer *
|
||
cpp_get_prev (cpp_buffer *b)
|
||
{
|
||
return b->prev;
|
||
}
|
||
|
||
/* This data structure holds the list of header files that were seen
|
||
while the PCH was being built. The 'entries' field is kept sorted
|
||
in memcmp() order; yes, this means that on little-endian systems,
|
||
it's sorted initially by the least-significant byte of 'size', but
|
||
that's OK. The code does rely on having entries with the same size
|
||
next to each other. */
|
||
|
||
struct pchf_entry {
|
||
/* The size of this file. This is used to save running a MD5 checksum
|
||
if the sizes don't match. */
|
||
off_t size;
|
||
/* The MD5 checksum of this file. */
|
||
unsigned char sum[16];
|
||
/* Is this file to be included only once? */
|
||
bool once_only;
|
||
};
|
||
|
||
struct pchf_data {
|
||
/* Number of pchf_entry structures. */
|
||
size_t count;
|
||
|
||
/* Are there any values with once_only set?
|
||
This is used as an optimisation, it means we don't have to search
|
||
the structure if we're processing a regular #include. */
|
||
bool have_once_only;
|
||
|
||
struct pchf_entry entries[1];
|
||
};
|
||
|
||
static struct pchf_data *pchf;
|
||
|
||
/* A qsort ordering function for pchf_entry structures. */
|
||
|
||
static int
|
||
pchf_save_compare (const void *e1, const void *e2)
|
||
{
|
||
return memcmp (e1, e2, sizeof (struct pchf_entry));
|
||
}
|
||
|
||
/* Create and write to F a pchf_data structure. */
|
||
|
||
bool
|
||
_cpp_save_file_entries (cpp_reader *pfile, FILE *fp)
|
||
{
|
||
size_t count = 0;
|
||
struct pchf_data *result;
|
||
size_t result_size;
|
||
_cpp_file *f;
|
||
bool ret;
|
||
|
||
for (f = pfile->all_files; f; f = f->next_file)
|
||
++count;
|
||
|
||
result_size = (sizeof (struct pchf_data)
|
||
+ sizeof (struct pchf_entry) * (count - 1));
|
||
result = XCNEWVAR (struct pchf_data, result_size);
|
||
|
||
result->count = 0;
|
||
result->have_once_only = false;
|
||
|
||
for (f = pfile->all_files; f; f = f->next_file)
|
||
{
|
||
size_t count;
|
||
|
||
/* This should probably never happen, since if a read error occurred
|
||
the PCH file shouldn't be written... */
|
||
if (f->dont_read || f->err_no)
|
||
continue;
|
||
|
||
if (f->stack_count == 0)
|
||
continue;
|
||
|
||
count = result->count++;
|
||
|
||
result->entries[count].once_only = f->once_only;
|
||
/* |= is avoided in the next line because of an HP C compiler bug */
|
||
result->have_once_only = result->have_once_only | f->once_only;
|
||
if (f->buffer_valid)
|
||
md5_buffer ((const char *)f->buffer,
|
||
f->st.st_size, result->entries[count].sum);
|
||
else
|
||
{
|
||
FILE *ff;
|
||
int oldfd = f->fd;
|
||
|
||
if (!open_file (f))
|
||
{
|
||
open_file_failed (pfile, f, 0, 0);
|
||
free (result);
|
||
return false;
|
||
}
|
||
ff = fdopen (f->fd, "rb");
|
||
md5_stream (ff, result->entries[count].sum);
|
||
fclose (ff);
|
||
f->fd = oldfd;
|
||
}
|
||
result->entries[count].size = f->st.st_size;
|
||
}
|
||
|
||
result_size = (sizeof (struct pchf_data)
|
||
+ sizeof (struct pchf_entry) * (result->count - 1));
|
||
|
||
qsort (result->entries, result->count, sizeof (struct pchf_entry),
|
||
pchf_save_compare);
|
||
|
||
ret = fwrite (result, result_size, 1, fp) == 1;
|
||
free (result);
|
||
return ret;
|
||
}
|
||
|
||
/* Read the pchf_data structure from F. */
|
||
|
||
bool
|
||
_cpp_read_file_entries (cpp_reader *pfile ATTRIBUTE_UNUSED, FILE *f)
|
||
{
|
||
struct pchf_data d;
|
||
|
||
if (fread (&d, sizeof (struct pchf_data) - sizeof (struct pchf_entry), 1, f)
|
||
!= 1)
|
||
return false;
|
||
|
||
pchf = XNEWVAR (struct pchf_data, sizeof (struct pchf_data)
|
||
+ sizeof (struct pchf_entry) * (d.count - 1));
|
||
memcpy (pchf, &d, sizeof (struct pchf_data) - sizeof (struct pchf_entry));
|
||
if (fread (pchf->entries, sizeof (struct pchf_entry), d.count, f)
|
||
!= d.count)
|
||
return false;
|
||
return true;
|
||
}
|
||
|
||
/* The parameters for pchf_compare. */
|
||
|
||
struct pchf_compare_data
|
||
{
|
||
/* The size of the file we're looking for. */
|
||
off_t size;
|
||
|
||
/* The MD5 checksum of the file, if it's been computed. */
|
||
unsigned char sum[16];
|
||
|
||
/* Is SUM valid? */
|
||
bool sum_computed;
|
||
|
||
/* Do we need to worry about entries that don't have ONCE_ONLY set? */
|
||
bool check_included;
|
||
|
||
/* The file that we're searching for. */
|
||
_cpp_file *f;
|
||
};
|
||
|
||
/* bsearch comparison function; look for D_P in E_P. */
|
||
|
||
static int
|
||
pchf_compare (const void *d_p, const void *e_p)
|
||
{
|
||
const struct pchf_entry *e = (const struct pchf_entry *)e_p;
|
||
struct pchf_compare_data *d = (struct pchf_compare_data *)d_p;
|
||
int result;
|
||
|
||
result = memcmp (&d->size, &e->size, sizeof (off_t));
|
||
if (result != 0)
|
||
return result;
|
||
|
||
if (! d->sum_computed)
|
||
{
|
||
_cpp_file *const f = d->f;
|
||
|
||
md5_buffer ((const char *)f->buffer, f->st.st_size, d->sum);
|
||
d->sum_computed = true;
|
||
}
|
||
|
||
result = memcmp (d->sum, e->sum, 16);
|
||
if (result != 0)
|
||
return result;
|
||
|
||
if (d->check_included || e->once_only)
|
||
return 0;
|
||
else
|
||
return 1;
|
||
}
|
||
|
||
/* Check that F is not in a list read from a PCH file (if any).
|
||
Assumes that f->buffer_valid is true. Return TRUE if the file
|
||
should not be read. */
|
||
|
||
static bool
|
||
check_file_against_entries (cpp_reader *pfile ATTRIBUTE_UNUSED,
|
||
_cpp_file *f,
|
||
bool check_included)
|
||
{
|
||
struct pchf_compare_data d;
|
||
|
||
if (pchf == NULL
|
||
|| (! check_included && ! pchf->have_once_only))
|
||
return false;
|
||
|
||
d.size = f->st.st_size;
|
||
d.sum_computed = false;
|
||
d.f = f;
|
||
d.check_included = check_included;
|
||
return bsearch (&d, pchf->entries, pchf->count, sizeof (struct pchf_entry),
|
||
pchf_compare) != NULL;
|
||
}
|
||
|
||
/* Return true if the file FNAME is found in the appropriate include file path
|
||
as indicated by ANGLE_BRACKETS. */
|
||
|
||
bool
|
||
_cpp_has_header (cpp_reader *pfile, const char *fname, int angle_brackets,
|
||
enum include_type type)
|
||
{
|
||
cpp_dir *start_dir = search_path_head (pfile, fname, angle_brackets, type);
|
||
_cpp_file *file = _cpp_find_file (pfile, fname, start_dir, angle_brackets,
|
||
_cpp_FFK_HAS_INCLUDE, 0);
|
||
return file->err_no != ENOENT;
|
||
}
|
||
|
||
/* Read a file and convert to input charset, the same as if it were being read
|
||
by a cpp_reader. */
|
||
|
||
cpp_converted_source
|
||
cpp_get_converted_source (const char *fname, const char *input_charset)
|
||
{
|
||
cpp_converted_source res = {};
|
||
_cpp_file file = {};
|
||
file.fd = -1;
|
||
file.name = lbasename (fname);
|
||
file.path = fname;
|
||
if (!open_file (&file))
|
||
return res;
|
||
const bool ok = read_file_guts (NULL, &file, 0, input_charset);
|
||
close (file.fd);
|
||
if (!ok)
|
||
return res;
|
||
res.to_free = (char *) file.buffer_start;
|
||
res.data = (char *) file.buffer;
|
||
res.len = file.st.st_size;
|
||
return res;
|
||
}
|