133 lines
4.3 KiB
C
133 lines
4.3 KiB
C
/* Functions for deciding which macros are currently in scope.
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Copyright 2002 Free Software Foundation, Inc.
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Contributed by Red Hat, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any 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; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "macroscope.h"
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#include "symtab.h"
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#include "source.h"
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#include "target.h"
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#include "frame.h"
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#include "inferior.h"
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#include "complaints.h"
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struct macro_scope *
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sal_macro_scope (struct symtab_and_line sal)
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{
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struct macro_source_file *main, *inclusion;
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struct macro_scope *ms;
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if (! sal.symtab
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|| ! sal.symtab->macro_table)
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return 0;
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ms = (struct macro_scope *) xmalloc (sizeof (*ms));
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main = macro_main (sal.symtab->macro_table);
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inclusion = macro_lookup_inclusion (main, sal.symtab->filename);
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if (inclusion)
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{
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ms->file = inclusion;
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ms->line = sal.line;
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}
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else
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{
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/* There are, unfortunately, cases where a compilation unit can
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have a symtab for a source file that doesn't appear in the
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macro table. For example, at the moment, Dwarf doesn't have
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any way in the .debug_macinfo section to describe the effect
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of #line directives, so if you debug a YACC parser you'll get
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a macro table which only mentions the .c files generated by
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YACC, but symtabs that mention the .y files consumed by YACC.
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In the long run, we should extend the Dwarf macro info
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representation to handle #line directives, and get GCC to
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emit it.
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For the time being, though, we'll just treat these as
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occurring at the end of the main source file. */
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ms->file = main;
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ms->line = -1;
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complaint (&symfile_complaints,
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"symtab found for `%s', but that file\n"
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"is not covered in the compilation unit's macro information",
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sal.symtab->filename);
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}
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return ms;
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}
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struct macro_scope *
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default_macro_scope (void)
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{
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struct symtab_and_line sal;
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struct macro_source_file *main;
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struct macro_scope *ms;
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/* If there's a selected frame, use its PC. */
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if (deprecated_selected_frame)
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sal = find_pc_line (get_frame_pc (deprecated_selected_frame), 0);
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/* If the target has any registers at all, then use its PC. Why we
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would have registers but no stack, I'm not sure. */
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else if (target_has_registers)
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sal = find_pc_line (read_pc (), 0);
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/* If all else fails, fall back to the current listing position. */
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else
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{
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/* Don't call select_source_symtab here. That can raise an
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error if symbols aren't loaded, but GDB calls the expression
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evaluator in all sorts of contexts.
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For example, commands like `set width' call the expression
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evaluator to evaluate their numeric arguments. If the
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current language is C, then that may call this function to
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choose a scope for macro expansion. If you don't have any
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symbol files loaded, then get_current_or_default would raise an
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error. But `set width' shouldn't raise an error just because
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it can't decide which scope to macro-expand its argument in. */
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struct symtab_and_line cursal =
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get_current_source_symtab_and_line ();
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sal.symtab = cursal.symtab;
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sal.line = cursal.line;
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}
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return sal_macro_scope (sal);
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}
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/* Look up the definition of the macro named NAME in scope at the source
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location given by BATON, which must be a pointer to a `struct
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macro_scope' structure. */
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struct macro_definition *
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standard_macro_lookup (const char *name, void *baton)
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{
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struct macro_scope *ms = (struct macro_scope *) baton;
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return macro_lookup_definition (ms->file, ms->line, name);
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}
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