/* C preprocessor macro tables for GDB.
- Copyright (C) 2002 Free Software Foundation, Inc.
+ Copyright (C) 2002-2013 Free Software Foundation, Inc.
Contributed by Red Hat, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdb_obstack.h"
#include "splay-tree.h"
+#include "filenames.h"
#include "symtab.h"
#include "symfile.h"
#include "objfiles.h"
#include "gdb_assert.h"
#include "bcache.h"
#include "complaints.h"
+#include "macroexp.h"
\f
/* The macro table structure. */
#inclusion tree; everything else is #included from here. */
struct macro_source_file *main_source;
+ /* True if macros in this table can be redefined without issuing an
+ error. */
+ int redef_ok;
+
/* The table of macro definitions. This is a splay tree (an ordered
binary tree that stays balanced, effectively), sorted by macro
name. Where a macro gets defined more than once (presumably with
static void
macro_free (void *object, struct macro_table *t)
{
- gdb_assert (! t->obstack);
- xfree (object);
+ if (t->obstack)
+ /* There are cases where we need to remove entries from a macro
+ table, even when reading debugging information. This should be
+ rare, and there's no easy way to free arbitrary data from an
+ obstack, so we just leak it. */
+ ;
+ else
+ xfree (object);
}
else
{
void *copy = xmalloc (len);
+
memcpy (copy, addr, len);
return copy;
}
static const char *
macro_bcache_str (struct macro_table *t, const char *s)
{
- return (char *) macro_bcache (t, s, strlen (s) + 1);
+ return macro_bcache (t, s, strlen (s) + 1);
}
/* Free a possibly bcached object OBJ. That is, if the macro table T
- has a bcache, it's an error; otherwise, xfree OBJ. */
+ has a bcache, do nothing; otherwise, xfree OBJ. */
static void
macro_bcache_free (struct macro_table *t, void *obj)
{
- gdb_assert (! t->bcache);
- xfree (obj);
+ if (t->bcache)
+ /* There are cases where we need to remove entries from a macro
+ table, even when reading debugging information. This should be
+ rare, and there's no easy way to free data from a bcache, so we
+ just leak it. */
+ ;
+ else
+ xfree (obj);
}
struct macro_table *table;
/* The name of the macro. This is in the table's bcache, if it has
- one. */
+ one. */
const char *name;
/* The source file and line number where the definition's scope
const char *name, struct macro_source_file *file, int line)
{
int names = strcmp (key->name, name);
+
if (names)
return names;
}
+void
+macro_allow_redefinitions (struct macro_table *t)
+{
+ gdb_assert (! t->obstack);
+ t->redef_ok = 1;
+}
+
+
struct macro_source_file *
macro_include (struct macro_source_file *source,
int line,
First, squawk. */
complaint (&symfile_complaints,
- _("both `%s' and `%s' allegedly #included at %s:%d"), included,
- (*link)->filename, source->filename, line);
+ _("both `%s' and `%s' allegedly #included at %s:%d"),
+ included, (*link)->filename, source->filename, line);
/* Now, choose a new, unoccupied line number for this
#inclusion, after the alleged #inclusion line. */
macro_lookup_inclusion (struct macro_source_file *source, const char *name)
{
/* Is SOURCE itself named NAME? */
- if (strcmp (name, source->filename) == 0)
+ if (filename_cmp (name, source->filename) == 0)
return source;
/* The filename in the source structure is probably a full path, but
int src_name_len = strlen (source->filename);
/* We do mean < here, and not <=; if the lengths are the same,
- then the strcmp above should have triggered, and we need to
+ then the filename_cmp above should have triggered, and we need to
check for a slash here. */
if (name_len < src_name_len
- && source->filename[src_name_len - name_len - 1] == '/'
- && strcmp (name, source->filename + src_name_len - name_len) == 0)
+ && IS_DIR_SEPARATOR (source->filename[src_name_len - name_len - 1])
+ && filename_cmp (name,
+ source->filename + src_name_len - name_len) == 0)
return source;
}
d->table = t;
d->kind = kind;
d->replacement = macro_bcache_str (t, replacement);
+ d->argc = argc;
if (kind == macro_function_like)
{
/* Now bcache the array of argument pointers itself. */
d->argv = macro_bcache (t, cached_argv, cached_argv_size);
- d->argc = argc;
}
/* We don't bcache the entire definition structure because it's got
if (! same)
{
complaint (&symfile_complaints,
- _("macro `%s' redefined at %s:%d; original definition at %s:%d"),
+ _("macro `%s' redefined at %s:%d; "
+ "original definition at %s:%d"),
name, source->filename, line,
found_key->start_file->filename, found_key->start_line);
}
return 0;
}
+/* A helper function to define a new object-like macro. */
-void
-macro_define_object (struct macro_source_file *source, int line,
- const char *name, const char *replacement)
+static void
+macro_define_object_internal (struct macro_source_file *source, int line,
+ const char *name, const char *replacement,
+ enum macro_special_kind kind)
{
struct macro_table *t = source->table;
- struct macro_key *k;
+ struct macro_key *k = NULL;
struct macro_definition *d;
- k = check_for_redefinition (source, line,
- name, macro_object_like,
- 0, 0,
- replacement);
+ if (! t->redef_ok)
+ k = check_for_redefinition (source, line,
+ name, macro_object_like,
+ 0, 0,
+ replacement);
/* If we're redefining a symbol, and the existing key would be
identical to our new key, then the splay_tree_insert function
return;
k = new_macro_key (t, name, source, line);
- d = new_macro_definition (t, macro_object_like, 0, 0, replacement);
+ d = new_macro_definition (t, macro_object_like, kind, 0, replacement);
splay_tree_insert (t->definitions, (splay_tree_key) k, (splay_tree_value) d);
}
+void
+macro_define_object (struct macro_source_file *source, int line,
+ const char *name, const char *replacement)
+{
+ macro_define_object_internal (source, line, name, replacement,
+ macro_ordinary);
+}
+
+/* See macrotab.h. */
+
+void
+macro_define_special (struct macro_table *table)
+{
+ macro_define_object_internal (table->main_source, -1, "__FILE__", "",
+ macro_FILE);
+ macro_define_object_internal (table->main_source, -1, "__LINE__", "",
+ macro_LINE);
+}
void
macro_define_function (struct macro_source_file *source, int line,
const char *replacement)
{
struct macro_table *t = source->table;
- struct macro_key *k;
+ struct macro_key *k = NULL;
struct macro_definition *d;
- k = check_for_redefinition (source, line,
- name, macro_function_like,
- argc, argv,
- replacement);
+ if (! t->redef_ok)
+ k = check_for_redefinition (source, line,
+ name, macro_function_like,
+ argc, argv,
+ replacement);
/* See comments about duplicate keys in macro_define_object. */
if (k && ! key_compare (k, name, source, line))
if (n)
{
- /* This function is the only place a macro's end-of-scope
- location gets set to anything other than "end of the
- compilation unit" (i.e., end_file is zero). So if this macro
- already has its end-of-scope set, then we're probably seeing
- a second #undefinition for the same #definition. */
struct macro_key *key = (struct macro_key *) n->key;
- if (key->end_file)
+ /* If we're removing a definition at exactly the same point that
+ we defined it, then just delete the entry altogether. GCC
+ 4.1.2 will generate DWARF that says to do this if you pass it
+ arguments like '-DFOO -UFOO -DFOO=2'. */
+ if (source == key->start_file
+ && line == key->start_line)
+ splay_tree_remove (source->table->definitions, n->key);
+
+ else
{
- complaint (&symfile_complaints,
- _("macro '%s' is #undefined twice, at %s:%d and %s:%d"), name,
- source->filename, line, key->end_file->filename,
- key->end_line);
- }
+ /* This function is the only place a macro's end-of-scope
+ location gets set to anything other than "end of the
+ compilation unit" (i.e., end_file is zero). So if this
+ macro already has its end-of-scope set, then we're
+ probably seeing a second #undefinition for the same
+ #definition. */
+ if (key->end_file)
+ {
+ complaint (&symfile_complaints,
+ _("macro '%s' is #undefined twice,"
+ " at %s:%d and %s:%d"),
+ name,
+ source->filename, line,
+ key->end_file->filename, key->end_line);
+ }
- /* Whatever the case, wipe out the old ending point, and
- make this the ending point. */
- key->end_file = source;
- key->end_line = line;
+ /* Whether or not we've seen a prior #undefinition, wipe out
+ the old ending point, and make this the ending point. */
+ key->end_file = source;
+ key->end_line = line;
+ }
}
else
{
}
}
+/* A helper function that rewrites the definition of a special macro,
+ when needed. */
+
+static struct macro_definition *
+fixup_definition (const char *filename, int line, struct macro_definition *def)
+{
+ static char *saved_expansion;
+
+ if (saved_expansion)
+ {
+ xfree (saved_expansion);
+ saved_expansion = NULL;
+ }
+
+ if (def->kind == macro_object_like)
+ {
+ if (def->argc == macro_FILE)
+ {
+ saved_expansion = macro_stringify (filename);
+ def->replacement = saved_expansion;
+ }
+ else if (def->argc == macro_LINE)
+ {
+ saved_expansion = xstrprintf ("%d", line);
+ def->replacement = saved_expansion;
+ }
+ }
+
+ return def;
+}
struct macro_definition *
macro_lookup_definition (struct macro_source_file *source,
splay_tree_node n = find_definition (name, source, line);
if (n)
- return (struct macro_definition *) n->value;
+ return fixup_definition (source->filename, line,
+ (struct macro_definition *) n->value);
else
return 0;
}
if (n)
{
struct macro_key *key = (struct macro_key *) n->key;
+
*definition_line = key->start_line;
return key->start_file;
}
}
+/* The type for callback data for iterating the splay tree in
+ macro_for_each and macro_for_each_in_scope. Only the latter uses
+ the FILE and LINE fields. */
+struct macro_for_each_data
+{
+ macro_callback_fn fn;
+ void *user_data;
+ struct macro_source_file *file;
+ int line;
+};
+
+/* Helper function for macro_for_each. */
+static int
+foreach_macro (splay_tree_node node, void *arg)
+{
+ struct macro_for_each_data *datum = (struct macro_for_each_data *) arg;
+ struct macro_key *key = (struct macro_key *) node->key;
+ struct macro_definition *def
+ = fixup_definition (key->start_file->filename, key->start_line,
+ (struct macro_definition *) node->value);
+
+ (*datum->fn) (key->name, def, key->start_file, key->start_line,
+ datum->user_data);
+ return 0;
+}
+
+/* Call FN for every macro in TABLE. */
+void
+macro_for_each (struct macro_table *table, macro_callback_fn fn,
+ void *user_data)
+{
+ struct macro_for_each_data datum;
+
+ datum.fn = fn;
+ datum.user_data = user_data;
+ datum.file = NULL;
+ datum.line = 0;
+ splay_tree_foreach (table->definitions, foreach_macro, &datum);
+}
+
+static int
+foreach_macro_in_scope (splay_tree_node node, void *info)
+{
+ struct macro_for_each_data *datum = (struct macro_for_each_data *) info;
+ struct macro_key *key = (struct macro_key *) node->key;
+ struct macro_definition *def
+ = fixup_definition (datum->file->filename, datum->line,
+ (struct macro_definition *) node->value);
+
+ /* See if this macro is defined before the passed-in line, and
+ extends past that line. */
+ if (compare_locations (key->start_file, key->start_line,
+ datum->file, datum->line) < 0
+ && (!key->end_file
+ || compare_locations (key->end_file, key->end_line,
+ datum->file, datum->line) >= 0))
+ (*datum->fn) (key->name, def, key->start_file, key->start_line,
+ datum->user_data);
+ return 0;
+}
+
+/* Call FN for every macro is visible in SCOPE. */
+void
+macro_for_each_in_scope (struct macro_source_file *file, int line,
+ macro_callback_fn fn, void *user_data)
+{
+ struct macro_for_each_data datum;
+
+ datum.fn = fn;
+ datum.user_data = user_data;
+ datum.file = file;
+ datum.line = line;
+ splay_tree_foreach (file->table->definitions,
+ foreach_macro_in_scope, &datum);
+}
+
+
\f
/* Creating and freeing macro tables. */
t->obstack = obstack;
t->bcache = b;
t->main_source = NULL;
+ t->redef_ok = 0;
t->definitions = (splay_tree_new_with_allocator
(macro_tree_compare,
((splay_tree_delete_key_fn) macro_tree_delete_key),
projects / external / binutils.git / blobdiff