/* Functions for deciding which macros are currently in scope.
- Copyright 2002 Free Software Foundation, Inc.
+ Copyright (C) 2002-2017 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., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "target.h"
#include "frame.h"
#include "inferior.h"
+#include "complaints.h"
+
+/* A table of user-defined macros. Unlike the macro tables used for
+ symtabs, this one uses xmalloc for all its allocation, not an
+ obstack, and it doesn't bcache anything; it just xmallocs things. So
+ it's perfectly possible to remove things from this, or redefine
+ things. */
+struct macro_table *macro_user_macros;
struct macro_scope *
sal_macro_scope (struct symtab_and_line sal)
{
- struct macro_source_file *main;
+ struct macro_source_file *main_file, *inclusion;
struct macro_scope *ms;
+ struct compunit_symtab *cust;
- if (! sal.symtab
- || ! sal.symtab->macro_table)
- return 0;
-
- ms = (struct macro_scope *) xmalloc (sizeof (*ms));
+ if (sal.symtab == NULL)
+ return NULL;
+ cust = SYMTAB_COMPUNIT (sal.symtab);
+ if (COMPUNIT_MACRO_TABLE (cust) == NULL)
+ return NULL;
- main = macro_main (sal.symtab->macro_table);
- ms->file = macro_lookup_inclusion (main, sal.symtab->filename);
+ ms = XNEW (struct macro_scope);
- if (! ms->file)
- internal_error
- (__FILE__, __LINE__,
- "\n"
- "the symtab `%s' refers to a preprocessor macro table which doesn't\n"
- "have any record of processing a file by that name.\n",
- sal.symtab->filename);
+ main_file = macro_main (COMPUNIT_MACRO_TABLE (cust));
+ inclusion = macro_lookup_inclusion (main_file, sal.symtab->filename);
- ms->line = sal.line;
+ if (inclusion)
+ {
+ ms->file = inclusion;
+ ms->line = sal.line;
+ }
+ else
+ {
+ /* There are, unfortunately, cases where a compilation unit can
+ have a symtab for a source file that doesn't appear in the
+ macro table. For example, at the moment, Dwarf doesn't have
+ any way in the .debug_macinfo section to describe the effect
+ of #line directives, so if you debug a YACC parser you'll get
+ a macro table which only mentions the .c files generated by
+ YACC, but symtabs that mention the .y files consumed by YACC.
+
+ In the long run, we should extend the Dwarf macro info
+ representation to handle #line directives, and get GCC to
+ emit it.
+
+ For the time being, though, we'll just treat these as
+ occurring at the end of the main source file. */
+ ms->file = main_file;
+ ms->line = -1;
+
+ complaint (&symfile_complaints,
+ _("symtab found for `%s', but that file\n"
+ "is not covered in the compilation unit's macro information"),
+ symtab_to_filename_for_display (sal.symtab));
+ }
return ms;
}
+struct macro_scope *
+user_macro_scope (void)
+{
+ struct macro_scope *ms;
+
+ ms = XNEW (struct macro_scope);
+ ms->file = macro_main (macro_user_macros);
+ ms->line = -1;
+ return ms;
+}
+
struct macro_scope *
default_macro_scope (void)
{
struct symtab_and_line sal;
- struct macro_source_file *main;
struct macro_scope *ms;
+ struct frame_info *frame;
+ CORE_ADDR pc;
- /* If there's a selected frame, use its PC. */
- if (selected_frame)
- sal = find_pc_line (selected_frame->pc, 0);
-
- /* If the target has any registers at all, then use its PC. Why we
- would have registers but no stack, I'm not sure. */
- else if (target_has_registers)
- sal = find_pc_line (read_pc (), 0);
+ /* If there's a selected frame, use its PC. */
+ frame = deprecated_safe_get_selected_frame ();
+ if (frame && get_frame_pc_if_available (frame, &pc))
+ sal = find_pc_line (pc, 0);
- /* If all else fails, fall back to the current listing position. */
+ /* Fall back to the current listing position. */
else
{
/* Don't call select_source_symtab here. That can raise an
sal.line = cursal.line;
}
- return sal_macro_scope (sal);
+ ms = sal_macro_scope (sal);
+ if (! ms)
+ ms = user_macro_scope ();
+
+ return ms;
}
standard_macro_lookup (const char *name, void *baton)
{
struct macro_scope *ms = (struct macro_scope *) baton;
+ struct macro_definition *result;
+
+ /* Give user-defined macros priority over all others. */
+ result = macro_lookup_definition (macro_main (macro_user_macros), -1, name);
+ if (! result)
+ result = macro_lookup_definition (ms->file, ms->line, name);
+ return result;
+}
- return macro_lookup_definition (ms->file, ms->line, name);
+/* Provide a prototype to silence -Wmissing-prototypes. */
+extern initialize_file_ftype _initialize_macroscope;
+
+void
+_initialize_macroscope (void)
+{
+ macro_user_macros = new_macro_table (NULL, NULL, NULL);
+ macro_set_main (macro_user_macros, "<user-defined>");
+ macro_allow_redefinitions (macro_user_macros);
}