/* Part of CPP library. File handling.
Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1998,
- 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
Written by Per Bothner, 1994.
Based on CCCP program by Paul Rubin, June 1986
Adapted to ANSI C, Richard Stallman, Jan 1987
#include "intl.h"
#include "mkdeps.h"
#include "hashtab.h"
+#include "md5.h"
#include <dirent.h>
/* Variable length record files on VMS will have a stat size that includes
/* If BUFFER above contains the true contents of the file. */
bool buffer_valid;
- /* 0: file not known to be a PCH.
- 1: file is a PCH (on return from find_include_file).
- 2: file is not and never will be a valid precompiled header.
- 3: file is always a valid precompiled header. */
- uchar pch;
+ /* File is a PCH (on return from find_include_file). */
+ bool pch;
};
/* A singly-linked list for all searches for a given file name, with
static char *remap_filename (cpp_reader *pfile, _cpp_file *file);
static char *append_file_to_dir (const char *fname, cpp_dir *dir);
static bool validate_pch (cpp_reader *, _cpp_file *file, const char *pchname);
-static bool include_pch_p (_cpp_file *file);
+static int pchf_adder (void **slot, void *data);
+static int pchf_save_compare (const void *e1, const void *e2);
+static int pchf_compare (const void *d_p, const void *e_p);
+static bool check_file_against_entries (cpp_reader *, _cpp_file *, bool);
/* Given a filename in FILE->PATH, with the empty string interpreted
as <stdin>, open it.
}
closedir (pchdir);
}
- file->pch |= valid;
- *invalid_pch |= ! valid;
+ if (valid)
+ file->pch = true;
+ else
+ *invalid_pch = true;
}
if (valid)
/* Try to open the path FILE->name appended to FILE->dir. This is
where remap and PCH intercept the file lookup process. Return true
- if the file was found, whether or not the open was successful.
+ if the file was found, whether or not the open was successful.
Set *INVALID_PCH to true if a PCH file is found but wasn't valid. */
static bool
if (CPP_OPTION (pfile, remap) && (path = remap_filename (pfile, file)))
;
else
- path = append_file_to_dir (file->name, file->dir);
+ if (file->dir->construct)
+ path = file->dir->construct (file->name, file->dir);
+ else
+ path = append_file_to_dir (file->name, file->dir);
- file->path = path;
- if (pch_open_file (pfile, file, invalid_pch))
- return true;
+ if (path)
+ {
+ file->path = path;
+ if (pch_open_file (pfile, file, invalid_pch))
+ return true;
- if (open_file (file))
- return true;
+ if (open_file (file))
+ return true;
+
+ if (file->err_no != ENOENT)
+ {
+ open_file_failed (pfile, file);
+ return true;
+ }
- if (file->err_no != ENOENT)
+ free (path);
+ file->path = file->name;
+ }
+ else
{
- open_file_failed (pfile, file);
- return true;
+ file->err_no = ENOENT;
+ file->path = NULL;
+ }
+
+ return false;
+}
+
+/* Return tue 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;
}
- free (path);
- file->path = file->name;
return false;
}
/* 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_seach_path.
+ 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.
file->dir = file->dir->next;
if (file->dir == NULL)
{
+ if (search_path_exhausted (pfile, fname, file))
+ return file;
+
open_file_failed (pfile, file);
if (invalid_pch)
{
- cpp_error (pfile, CPP_DL_ERROR,
+ 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_ERROR,
+ cpp_error (pfile, CPP_DL_ERROR,
"use -Winvalid-pch for more information");
}
break;
ssize_t size, total, count;
uchar *buf;
bool regular;
-
+
if (S_ISBLK (file->st.st_mode))
{
cpp_error (pfile, CPP_DL_ERROR, "%s is a block device", file->path);
cpp_error (pfile, CPP_DL_WARNING,
"%s is shorter than expected", file->path);
- /* Shrink buffer if we allocated substantially too much. */
- if (total + 4096 < size)
- buf = xrealloc (buf, total + 1);
-
- /* The lexer requires that the buffer be \n-terminated. */
- buf[total] = '\n';
-
- file->buffer = buf;
- file->st.st_size = total;
+ file->buffer = _cpp_convert_input (pfile, CPP_OPTION (pfile, input_charset),
+ buf, size, total, &file->st.st_size);
file->buffer_valid = true;
return true;
if (file->once_only)
return false;
- /* We must mark the file once-only if #import now, before header
+ /* 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)
return false;
/* Handle PCH files immediately; don't stack them. */
- if (include_pch_p (file))
+ if (file->pch)
{
pfile->cb.read_pch (pfile, file->path, file->fd, file->pchname);
close (file->fd);
if (!read_file (pfile, file))
return false;
+ /* 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)
if (!should_stack_file (pfile, file, import))
return false;
- sysp = MAX ((pfile->map ? pfile->map->sysp : 0),
- (file->dir ? file->dir->sysp : 0));
+ if (pfile->buffer == NULL || file->dir == NULL)
+ sysp = 0;
+ else
+ 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 && !file->stack_count)
buffer = cpp_push_buffer (pfile, file->buffer, file->st.st_size,
CPP_OPTION (pfile, preprocessed));
buffer->file = file;
+ buffer->sysp = sysp;
/* Initialize controlling macro state. */
pfile->mi_valid = true;
else if (pfile->quote_ignores_source_dir)
dir = pfile->quote_include;
else
- return make_cpp_dir (pfile, dir_name_of_file (file), pfile->map->sysp);
+ 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,
enum include_type type)
{
struct cpp_dir *dir;
+ _cpp_file *file;
dir = search_path_head (pfile, fname, angle_brackets, type);
if (!dir)
return false;
- return _cpp_stack_file (pfile, _cpp_find_file (pfile, fname, dir, false),
- type == IT_IMPORT);
+ file = _cpp_find_file (pfile, fname, dir, false);
+
+ /* Compensate for the increment in linemap_add. In the case of a
+ normal #include, we're currently at the start of the line
+ *following* the #include. A separate source_location for this
+ location makes no sense (until we do the LC_LEAVE), and
+ complicates LAST_SOURCE_LINE_LOCATION. This does not apply if we
+ found a PCH file (in which case linemap_add is not called) or we
+ were included from the command-line. */
+ if (! file->pch && file->err_no == 0 && type != IT_CMDLINE)
+ pfile->line_table->highest_location--;
+
+ return _cpp_stack_file (pfile, file, type == IT_IMPORT);
}
/* Could not open FILE. The complication is dependency output. */
static void
open_file_failed (cpp_reader *pfile, _cpp_file *file)
{
- int sysp = pfile->map ? pfile->map->sysp: 0;
+ int sysp = pfile->line_table->highest_line > 1 && pfile->buffer ? pfile->buffer->sysp : 0;
bool print_dep = CPP_OPTION (pfile, deps.style) > !!sysp;
errno = file->err_no;
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);
return entry != NULL;
}
-/* Calculate the hash value of a file hash entry P. */
+/* Calculate the hash value of a file hash entry P. */
static hashval_t
file_hash_hash (const void *p)
cpp_make_system_header (cpp_reader *pfile, int syshdr, int externc)
{
int flags = 0;
+ const struct line_maps *line_table = pfile->line_table;
+ const struct line_map *map = &line_table->maps[line_table->used-1];
/* 1 = system header, 2 = system header to be treated as C. */
if (syshdr)
flags = 1 + (externc != 0);
- _cpp_do_file_change (pfile, LC_RENAME, pfile->map->to_file,
- SOURCE_LINE (pfile->map, pfile->line), flags);
+ pfile->buffer->sysp = flags;
+ _cpp_do_file_change (pfile, LC_RENAME, map->to_file,
+ SOURCE_LINE (map, pfile->line_table->highest_line), flags);
}
/* Allow the client to change the current file. Used by the front end
bool
cpp_push_include (cpp_reader *pfile, const char *fname)
{
- /* Make the command line directive take up a line. */
- pfile->line++;
return _cpp_stack_include (pfile, fname, false, IT_CMDLINE);
}
}
}
-/* Return true if FILE is usable by PCH. */
-static bool
-include_pch_p (_cpp_file *file)
-{
- return file->pch & 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)
if (CPP_OPTION (pfile, print_include_names))
{
unsigned int i;
- for (i = 1; i < pfile->line_maps.depth; 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;
+}
+\f
+/* 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_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 {
+ /* 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;
+ } entries[1];
+};
+
+static struct pchf_data *pchf;
+
+/* Data for pchf_addr. */
+struct pchf_adder_info
+{
+ cpp_reader *pfile;
+ struct pchf_data *d;
+};
+
+/* A hash traversal function to add entries into DATA->D. */
+
+static int
+pchf_adder (void **slot, void *data)
+{
+ struct file_hash_entry *h = (struct file_hash_entry *) *slot;
+ struct pchf_adder_info *i = (struct pchf_adder_info *) data;
+
+ if (h->start_dir != NULL && h->u.file->stack_count != 0)
+ {
+ struct pchf_data *d = i->d;
+ _cpp_file *f = h->u.file;
+ size_t count = d->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)
+ return 1;
+
+ d->entries[count].once_only = f->once_only;
+ /* |= is avoided in the next line because of an HP C compiler bug */
+ d->have_once_only = d->have_once_only | f->once_only;
+ if (f->buffer_valid)
+ md5_buffer ((const char *)f->buffer,
+ f->st.st_size, d->entries[count].sum);
+ else
+ {
+ FILE *ff;
+ int oldfd = f->fd;
+
+ if (!open_file (f))
+ {
+ open_file_failed (i->pfile, f);
+ return 0;
+ }
+ ff = fdopen (f->fd, "rb");
+ md5_stream (ff, d->entries[count].sum);
+ fclose (ff);
+ f->fd = oldfd;
+ }
+ d->entries[count].size = f->st.st_size;
+ }
+ return 1;
+}
+
+/* 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 *f)
+{
+ size_t count = 0;
+ struct pchf_data *result;
+ size_t result_size;
+ struct pchf_adder_info pai;
+
+ count = htab_elements (pfile->file_hash);
+ result_size = (sizeof (struct pchf_data)
+ + sizeof (struct pchf_entry) * (count - 1));
+ result = xcalloc (result_size, 1);
+
+ result->count = 0;
+ result->have_once_only = false;
+
+ pai.pfile = pfile;
+ pai.d = result;
+ htab_traverse (pfile->file_hash, pchf_adder, &pai);
+
+ 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);
+
+ return fwrite (result, result_size, 1, f) == 1;
+}
+
+/* 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 = xmalloc (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;
+}
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