1/* Functions for deciding which macros are currently in scope. 2 Copyright (C) 2002, 2007 Free Software Foundation, Inc. 3 Contributed by Red Hat, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20#include "defs.h" 21 22#include "macroscope.h" 23#include "symtab.h" 24#include "source.h" 25#include "target.h" 26#include "frame.h" 27#include "inferior.h" 28#include "complaints.h" 29 30 31struct macro_scope * 32sal_macro_scope (struct symtab_and_line sal) 33{ 34 struct macro_source_file *main_file, *inclusion; 35 struct macro_scope *ms; 36 37 if (! sal.symtab 38 || ! sal.symtab->macro_table) 39 return 0; 40 41 ms = (struct macro_scope *) xmalloc (sizeof (*ms)); 42 43 main_file = macro_main (sal.symtab->macro_table); 44 inclusion = macro_lookup_inclusion (main_file, sal.symtab->filename); 45 46 if (inclusion) 47 { 48 ms->file = inclusion; 49 ms->line = sal.line; 50 } 51 else 52 { 53 /* There are, unfortunately, cases where a compilation unit can 54 have a symtab for a source file that doesn't appear in the 55 macro table. For example, at the moment, Dwarf doesn't have 56 any way in the .debug_macinfo section to describe the effect 57 of #line directives, so if you debug a YACC parser you'll get 58 a macro table which only mentions the .c files generated by 59 YACC, but symtabs that mention the .y files consumed by YACC. 60 61 In the long run, we should extend the Dwarf macro info 62 representation to handle #line directives, and get GCC to 63 emit it. 64 65 For the time being, though, we'll just treat these as 66 occurring at the end of the main source file. */ 67 ms->file = main_file; 68 ms->line = -1; 69 70 complaint (&symfile_complaints, 71 _("symtab found for `%s', but that file\n" 72 "is not covered in the compilation unit's macro information"), 73 sal.symtab->filename); 74 } 75 76 return ms; 77} 78 79 80struct macro_scope * 81default_macro_scope (void) 82{ 83 struct symtab_and_line sal; 84 struct macro_scope *ms; 85 struct frame_info *frame; 86 87 /* If there's a selected frame, use its PC. */ 88 frame = deprecated_safe_get_selected_frame (); 89 if (frame) 90 sal = find_pc_line (get_frame_pc (frame), 0); 91 92 /* Fall back to the current listing position. */ 93 else 94 { 95 /* Don't call select_source_symtab here. That can raise an 96 error if symbols aren't loaded, but GDB calls the expression 97 evaluator in all sorts of contexts. 98 99 For example, commands like `set width' call the expression 100 evaluator to evaluate their numeric arguments. If the 101 current language is C, then that may call this function to 102 choose a scope for macro expansion. If you don't have any 103 symbol files loaded, then get_current_or_default would raise an 104 error. But `set width' shouldn't raise an error just because 105 it can't decide which scope to macro-expand its argument in. */ 106 struct symtab_and_line cursal = 107 get_current_source_symtab_and_line (); 108 109 sal.symtab = cursal.symtab; 110 sal.line = cursal.line; 111 } 112 113 return sal_macro_scope (sal); 114} 115 116 117/* Look up the definition of the macro named NAME in scope at the source 118 location given by BATON, which must be a pointer to a `struct 119 macro_scope' structure. */ 120struct macro_definition * 121standard_macro_lookup (const char *name, void *baton) 122{ 123 struct macro_scope *ms = (struct macro_scope *) baton; 124 125 return macro_lookup_definition (ms->file, ms->line, name); 126} 127