71a3c36949
In Rust, virtual tables work a bit differently than they do in C++. In C++, as you know, they are connected to a particular class hierarchy. Rust, instead, can generate a virtual table for potentially any type -- in fact, one such virtual table for each trait (a trait is similar to an abstract class or to a Java interface) that a type implements. Objects that are referenced via a trait can't currently be inspected by gdb. This patch implements the Rust equivalent of "set print object". gdb relies heavily on the C++ ABI to decode virtual tables; primarily to make "set print object" work; but also "info vtbl". However, Rust does not currently have a specified ABI, so this approach seems unwise to emulate. Instead, I've changed the Rust compiler to emit some DWARF that describes trait objects (previously their internal structure was opaque), vtables (currently just a size -- but I hope to expand this in the future), and the concrete type for which a vtable was emitted. The concrete type is expressed as a DW_AT_containing_type on the vtable's type. This is a small extension to DWARF. This patch adds a new entry to quick_symbol_functions to return the symtab that holds a data address. Previously there was no way in gdb to look up a full (only minimal) non-text symbol by address. The psymbol implementation of this method works by lazily filling in a map that is added to the objfile. This avoids slowing down psymbol reading for a feature that is likely to not be used too frequently. I did not update .gdb_index. My thinking here is that the DWARF 5 indices will obsolete .gdb_index soon-ish, meaning that adding a new feature to them is probably wasted work. If necessary I can update the DWARF 5 index code when it lands in gdb. Regression tested on x86-64 Fedora 25. 2017-11-17 Tom Tromey <tom@tromey.com> * symtab.h (struct symbol) <is_rust_vtable>: New member. (struct rust_vtable_symbol): New. (find_symbol_at_address): Declare. * symtab.c (find_symbol_at_address): New function. * symfile.h (struct quick_symbol_functions) <find_compunit_symtab_by_address>: New member. * symfile-debug.c (debug_qf_find_compunit_symtab_by_address): New function. (debug_sym_quick_functions): Link to debug_qf_find_compunit_symtab_by_address. * rust-lang.c (rust_get_trait_object_pointer): New function. (rust_evaluate_subexp) <case UNOP_IND>: New case. Call rust_get_trait_object_pointer. * psymtab.c (psym_relocate): Clear psymbol_map. (psym_fill_psymbol_map, psym_find_compunit_symtab_by_address): New functions. (psym_functions): Link to psym_find_compunit_symtab_by_address. * objfiles.h (struct objfile) <psymbol_map>: New member. * dwarf2read.c (dwarf2_gdb_index_functions): Update. (process_die) <DW_TAG_variable>: New case. Call read_variable. (rust_containing_type, read_variable): New functions. 2017-11-17 Tom Tromey <tom@tromey.com> * gdb.rust/traits.rs: New file. * gdb.rust/traits.exp: New file.
722 lines
22 KiB
C
722 lines
22 KiB
C
/* Debug logging for the symbol file functions for the GNU debugger, GDB.
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Copyright (C) 2013-2017 Free Software Foundation, Inc.
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Contributed by Cygnus Support, using pieces from other GDB modules.
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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 3 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, see <http://www.gnu.org/licenses/>. */
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/* Note: Be careful with functions that can throw errors.
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We want to see a logging message regardless of whether an error was thrown.
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This typically means printing a message before calling the real function
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and then if the function returns a result printing a message after it
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returns. */
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#include "defs.h"
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#include "gdbcmd.h"
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#include "objfiles.h"
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#include "observer.h"
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#include "source.h"
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#include "symtab.h"
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#include "symfile.h"
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/* We need to save a pointer to the real symbol functions.
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Plus, the debug versions are malloc'd because we have to NULL out the
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ones that are NULL in the real copy. */
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struct debug_sym_fns_data
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{
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const struct sym_fns *real_sf;
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struct sym_fns debug_sf;
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};
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/* We need to record a pointer to the real set of functions for each
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objfile. */
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static const struct objfile_data *symfile_debug_objfile_data_key;
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/* If non-zero all calls to the symfile functions are logged. */
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static int debug_symfile = 0;
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/* Return non-zero if symfile debug logging is installed. */
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static int
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symfile_debug_installed (struct objfile *objfile)
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{
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return (objfile->sf != NULL
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&& objfile_data (objfile, symfile_debug_objfile_data_key) != NULL);
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}
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/* Utility return the name to print for SYMTAB. */
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static const char *
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debug_symtab_name (struct symtab *symtab)
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{
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return symtab_to_filename_for_display (symtab);
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}
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/* Debugging version of struct quick_symbol_functions. */
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static int
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debug_qf_has_symbols (struct objfile *objfile)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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int retval;
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retval = debug_data->real_sf->qf->has_symbols (objfile);
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fprintf_filtered (gdb_stdlog, "qf->has_symbols (%s) = %d\n",
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objfile_debug_name (objfile), retval);
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return retval;
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}
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static struct symtab *
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debug_qf_find_last_source_symtab (struct objfile *objfile)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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struct symtab *retval;
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fprintf_filtered (gdb_stdlog, "qf->find_last_source_symtab (%s)\n",
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objfile_debug_name (objfile));
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retval = debug_data->real_sf->qf->find_last_source_symtab (objfile);
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fprintf_filtered (gdb_stdlog, "qf->find_last_source_symtab (...) = %s\n",
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retval ? debug_symtab_name (retval) : "NULL");
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return retval;
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}
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static void
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debug_qf_forget_cached_source_info (struct objfile *objfile)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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fprintf_filtered (gdb_stdlog, "qf->forget_cached_source_info (%s)\n",
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objfile_debug_name (objfile));
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debug_data->real_sf->qf->forget_cached_source_info (objfile);
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}
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static bool
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debug_qf_map_symtabs_matching_filename
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(struct objfile *objfile, const char *name, const char *real_path,
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gdb::function_view<bool (symtab *)> callback)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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fprintf_filtered (gdb_stdlog,
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"qf->map_symtabs_matching_filename (%s, \"%s\", \"%s\", %s)\n",
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objfile_debug_name (objfile), name,
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real_path ? real_path : NULL,
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host_address_to_string (&callback));
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bool retval = (debug_data->real_sf->qf->map_symtabs_matching_filename
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(objfile, name, real_path, callback));
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fprintf_filtered (gdb_stdlog,
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"qf->map_symtabs_matching_filename (...) = %d\n",
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retval);
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return retval;
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}
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static struct compunit_symtab *
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debug_qf_lookup_symbol (struct objfile *objfile, int kind, const char *name,
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domain_enum domain)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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struct compunit_symtab *retval;
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fprintf_filtered (gdb_stdlog,
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"qf->lookup_symbol (%s, %d, \"%s\", %s)\n",
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objfile_debug_name (objfile), kind, name,
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domain_name (domain));
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retval = debug_data->real_sf->qf->lookup_symbol (objfile, kind, name,
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domain);
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fprintf_filtered (gdb_stdlog, "qf->lookup_symbol (...) = %s\n",
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retval
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? debug_symtab_name (compunit_primary_filetab (retval))
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: "NULL");
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return retval;
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}
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static void
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debug_qf_print_stats (struct objfile *objfile)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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fprintf_filtered (gdb_stdlog, "qf->print_stats (%s)\n",
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objfile_debug_name (objfile));
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debug_data->real_sf->qf->print_stats (objfile);
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}
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static void
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debug_qf_dump (struct objfile *objfile)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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fprintf_filtered (gdb_stdlog, "qf->dump (%s)\n",
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objfile_debug_name (objfile));
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debug_data->real_sf->qf->dump (objfile);
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}
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static void
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debug_qf_relocate (struct objfile *objfile,
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const struct section_offsets *new_offsets,
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const struct section_offsets *delta)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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fprintf_filtered (gdb_stdlog, "qf->relocate (%s, %s, %s)\n",
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objfile_debug_name (objfile),
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host_address_to_string (new_offsets),
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host_address_to_string (delta));
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debug_data->real_sf->qf->relocate (objfile, new_offsets, delta);
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}
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static void
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debug_qf_expand_symtabs_for_function (struct objfile *objfile,
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const char *func_name)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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fprintf_filtered (gdb_stdlog,
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"qf->expand_symtabs_for_function (%s, \"%s\")\n",
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objfile_debug_name (objfile), func_name);
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debug_data->real_sf->qf->expand_symtabs_for_function (objfile, func_name);
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}
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static void
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debug_qf_expand_all_symtabs (struct objfile *objfile)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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fprintf_filtered (gdb_stdlog, "qf->expand_all_symtabs (%s)\n",
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objfile_debug_name (objfile));
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debug_data->real_sf->qf->expand_all_symtabs (objfile);
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}
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static void
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debug_qf_expand_symtabs_with_fullname (struct objfile *objfile,
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const char *fullname)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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fprintf_filtered (gdb_stdlog,
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"qf->expand_symtabs_with_fullname (%s, \"%s\")\n",
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objfile_debug_name (objfile), fullname);
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debug_data->real_sf->qf->expand_symtabs_with_fullname (objfile, fullname);
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}
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static void
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debug_qf_map_matching_symbols (struct objfile *objfile,
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const char *name, domain_enum domain,
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int global,
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int (*callback) (struct block *,
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struct symbol *, void *),
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void *data,
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symbol_name_match_type match,
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symbol_compare_ftype *ordered_compare)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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fprintf_filtered (gdb_stdlog,
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"qf->map_matching_symbols (%s, \"%s\", %s, %d, %s, %s, %s, %s)\n",
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objfile_debug_name (objfile), name,
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domain_name (domain), global,
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host_address_to_string (callback),
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host_address_to_string (data),
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plongest ((LONGEST) match),
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host_address_to_string (ordered_compare));
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debug_data->real_sf->qf->map_matching_symbols (objfile, name,
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domain, global,
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callback, data,
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match,
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ordered_compare);
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}
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static void
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debug_qf_expand_symtabs_matching
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(struct objfile *objfile,
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gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
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const lookup_name_info &lookup_name,
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gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
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gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
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enum search_domain kind)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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fprintf_filtered (gdb_stdlog,
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"qf->expand_symtabs_matching (%s, %s, %s, %s, %s)\n",
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objfile_debug_name (objfile),
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host_address_to_string (&file_matcher),
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host_address_to_string (&symbol_matcher),
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host_address_to_string (&expansion_notify),
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search_domain_name (kind));
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debug_data->real_sf->qf->expand_symtabs_matching (objfile,
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file_matcher,
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lookup_name,
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symbol_matcher,
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expansion_notify,
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kind);
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}
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static struct compunit_symtab *
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debug_qf_find_pc_sect_compunit_symtab (struct objfile *objfile,
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struct bound_minimal_symbol msymbol,
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CORE_ADDR pc,
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struct obj_section *section,
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int warn_if_readin)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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struct compunit_symtab *retval;
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fprintf_filtered (gdb_stdlog,
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"qf->find_pc_sect_compunit_symtab (%s, %s, %s, %s, %d)\n",
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objfile_debug_name (objfile),
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host_address_to_string (msymbol.minsym),
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hex_string (pc),
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host_address_to_string (section),
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warn_if_readin);
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retval
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= debug_data->real_sf->qf->find_pc_sect_compunit_symtab (objfile, msymbol,
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pc, section,
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warn_if_readin);
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fprintf_filtered (gdb_stdlog,
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"qf->find_pc_sect_compunit_symtab (...) = %s\n",
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retval
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? debug_symtab_name (compunit_primary_filetab (retval))
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: "NULL");
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return retval;
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}
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static void
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debug_qf_map_symbol_filenames (struct objfile *objfile,
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symbol_filename_ftype *fun, void *data,
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int need_fullname)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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fprintf_filtered (gdb_stdlog,
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"qf->map_symbol_filenames (%s, %s, %s, %d)\n",
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objfile_debug_name (objfile),
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host_address_to_string (fun),
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host_address_to_string (data),
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need_fullname);
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debug_data->real_sf->qf->map_symbol_filenames (objfile, fun, data,
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need_fullname);
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}
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static struct compunit_symtab *
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debug_qf_find_compunit_symtab_by_address (struct objfile *objfile,
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CORE_ADDR address)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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fprintf_filtered (gdb_stdlog,
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"qf->find_compunit_symtab_by_address (%s, %s)\n",
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objfile_debug_name (objfile),
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hex_string (address));
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struct compunit_symtab *result = NULL;
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if (debug_data->real_sf->qf->map_symbol_filenames != NULL)
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result
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= debug_data->real_sf->qf->find_compunit_symtab_by_address (objfile,
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address);
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fprintf_filtered (gdb_stdlog,
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"qf->find_compunit_symtab_by_address (...) = %s\n",
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result
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? debug_symtab_name (compunit_primary_filetab (result))
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: "NULL");
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return result;
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}
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static const struct quick_symbol_functions debug_sym_quick_functions =
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{
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debug_qf_has_symbols,
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debug_qf_find_last_source_symtab,
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debug_qf_forget_cached_source_info,
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debug_qf_map_symtabs_matching_filename,
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debug_qf_lookup_symbol,
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debug_qf_print_stats,
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debug_qf_dump,
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debug_qf_relocate,
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debug_qf_expand_symtabs_for_function,
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debug_qf_expand_all_symtabs,
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debug_qf_expand_symtabs_with_fullname,
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debug_qf_map_matching_symbols,
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debug_qf_expand_symtabs_matching,
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debug_qf_find_pc_sect_compunit_symtab,
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debug_qf_find_compunit_symtab_by_address,
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debug_qf_map_symbol_filenames
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};
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/* Debugging version of struct sym_probe_fns. */
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static const std::vector<probe *> &
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debug_sym_get_probes (struct objfile *objfile)
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{
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const struct debug_sym_fns_data *debug_data
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= ((const struct debug_sym_fns_data *)
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objfile_data (objfile, symfile_debug_objfile_data_key));
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const std::vector<probe *> &retval
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= debug_data->real_sf->sym_probe_fns->sym_get_probes (objfile);
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fprintf_filtered (gdb_stdlog,
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"probes->sym_get_probes (%s) = %s\n",
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objfile_debug_name (objfile),
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host_address_to_string (retval.data ()));
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return retval;
|
||
}
|
||
|
||
static const struct sym_probe_fns debug_sym_probe_fns =
|
||
{
|
||
debug_sym_get_probes,
|
||
};
|
||
|
||
/* Debugging version of struct sym_fns. */
|
||
|
||
static void
|
||
debug_sym_new_init (struct objfile *objfile)
|
||
{
|
||
const struct debug_sym_fns_data *debug_data
|
||
= ((const struct debug_sym_fns_data *)
|
||
objfile_data (objfile, symfile_debug_objfile_data_key));
|
||
|
||
fprintf_filtered (gdb_stdlog, "sf->sym_new_init (%s)\n",
|
||
objfile_debug_name (objfile));
|
||
|
||
debug_data->real_sf->sym_new_init (objfile);
|
||
}
|
||
|
||
static void
|
||
debug_sym_init (struct objfile *objfile)
|
||
{
|
||
const struct debug_sym_fns_data *debug_data
|
||
= ((const struct debug_sym_fns_data *)
|
||
objfile_data (objfile, symfile_debug_objfile_data_key));
|
||
|
||
fprintf_filtered (gdb_stdlog, "sf->sym_init (%s)\n",
|
||
objfile_debug_name (objfile));
|
||
|
||
debug_data->real_sf->sym_init (objfile);
|
||
}
|
||
|
||
static void
|
||
debug_sym_read (struct objfile *objfile, symfile_add_flags symfile_flags)
|
||
{
|
||
const struct debug_sym_fns_data *debug_data
|
||
= ((const struct debug_sym_fns_data *)
|
||
objfile_data (objfile, symfile_debug_objfile_data_key));
|
||
|
||
fprintf_filtered (gdb_stdlog, "sf->sym_read (%s, 0x%x)\n",
|
||
objfile_debug_name (objfile), (unsigned) symfile_flags);
|
||
|
||
debug_data->real_sf->sym_read (objfile, symfile_flags);
|
||
}
|
||
|
||
static void
|
||
debug_sym_read_psymbols (struct objfile *objfile)
|
||
{
|
||
const struct debug_sym_fns_data *debug_data
|
||
= ((const struct debug_sym_fns_data *)
|
||
objfile_data (objfile, symfile_debug_objfile_data_key));
|
||
|
||
fprintf_filtered (gdb_stdlog, "sf->sym_read_psymbols (%s)\n",
|
||
objfile_debug_name (objfile));
|
||
|
||
debug_data->real_sf->sym_read_psymbols (objfile);
|
||
}
|
||
|
||
static void
|
||
debug_sym_finish (struct objfile *objfile)
|
||
{
|
||
const struct debug_sym_fns_data *debug_data
|
||
= ((const struct debug_sym_fns_data *)
|
||
objfile_data (objfile, symfile_debug_objfile_data_key));
|
||
|
||
fprintf_filtered (gdb_stdlog, "sf->sym_finish (%s)\n",
|
||
objfile_debug_name (objfile));
|
||
|
||
debug_data->real_sf->sym_finish (objfile);
|
||
}
|
||
|
||
static void
|
||
debug_sym_offsets (struct objfile *objfile,
|
||
const struct section_addr_info *info)
|
||
{
|
||
const struct debug_sym_fns_data *debug_data
|
||
= ((const struct debug_sym_fns_data *)
|
||
objfile_data (objfile, symfile_debug_objfile_data_key));
|
||
|
||
fprintf_filtered (gdb_stdlog, "sf->sym_offsets (%s, %s)\n",
|
||
objfile_debug_name (objfile),
|
||
host_address_to_string (info));
|
||
|
||
debug_data->real_sf->sym_offsets (objfile, info);
|
||
}
|
||
|
||
static struct symfile_segment_data *
|
||
debug_sym_segments (bfd *abfd)
|
||
{
|
||
/* This API function is annoying, it doesn't take a "this" pointer.
|
||
Fortunately it is only used in one place where we (re-)lookup the
|
||
sym_fns table to use. Thus we will never be called. */
|
||
gdb_assert_not_reached ("debug_sym_segments called");
|
||
}
|
||
|
||
static void
|
||
debug_sym_read_linetable (struct objfile *objfile)
|
||
{
|
||
const struct debug_sym_fns_data *debug_data
|
||
= ((const struct debug_sym_fns_data *)
|
||
objfile_data (objfile, symfile_debug_objfile_data_key));
|
||
|
||
fprintf_filtered (gdb_stdlog, "sf->sym_read_linetable (%s)\n",
|
||
objfile_debug_name (objfile));
|
||
|
||
debug_data->real_sf->sym_read_linetable (objfile);
|
||
}
|
||
|
||
static bfd_byte *
|
||
debug_sym_relocate (struct objfile *objfile, asection *sectp, bfd_byte *buf)
|
||
{
|
||
const struct debug_sym_fns_data *debug_data
|
||
= ((const struct debug_sym_fns_data *)
|
||
objfile_data (objfile, symfile_debug_objfile_data_key));
|
||
bfd_byte *retval;
|
||
|
||
retval = debug_data->real_sf->sym_relocate (objfile, sectp, buf);
|
||
|
||
fprintf_filtered (gdb_stdlog,
|
||
"sf->sym_relocate (%s, %s, %s) = %s\n",
|
||
objfile_debug_name (objfile),
|
||
host_address_to_string (sectp),
|
||
host_address_to_string (buf),
|
||
host_address_to_string (retval));
|
||
|
||
return retval;
|
||
}
|
||
|
||
/* Template of debugging version of struct sym_fns.
|
||
A copy is made, with sym_flavour updated, and a pointer to the real table
|
||
installed in real_sf, and then a pointer to the copy is installed in the
|
||
objfile. */
|
||
|
||
static const struct sym_fns debug_sym_fns =
|
||
{
|
||
debug_sym_new_init,
|
||
debug_sym_init,
|
||
debug_sym_read,
|
||
debug_sym_read_psymbols,
|
||
debug_sym_finish,
|
||
debug_sym_offsets,
|
||
debug_sym_segments,
|
||
debug_sym_read_linetable,
|
||
debug_sym_relocate,
|
||
&debug_sym_probe_fns,
|
||
&debug_sym_quick_functions
|
||
};
|
||
|
||
/* Free the copy of sym_fns recorded in the registry. */
|
||
|
||
static void
|
||
symfile_debug_free_objfile (struct objfile *objfile, void *datum)
|
||
{
|
||
xfree (datum);
|
||
}
|
||
|
||
/* Install the debugging versions of the symfile functions for OBJFILE.
|
||
Do not call this if the debug versions are already installed. */
|
||
|
||
static void
|
||
install_symfile_debug_logging (struct objfile *objfile)
|
||
{
|
||
const struct sym_fns *real_sf;
|
||
struct debug_sym_fns_data *debug_data;
|
||
|
||
/* The debug versions should not already be installed. */
|
||
gdb_assert (!symfile_debug_installed (objfile));
|
||
|
||
real_sf = objfile->sf;
|
||
|
||
/* Alas we have to preserve NULL entries in REAL_SF. */
|
||
debug_data = XCNEW (struct debug_sym_fns_data);
|
||
|
||
#define COPY_SF_PTR(from, to, name, func) \
|
||
do { \
|
||
if ((from)->name) \
|
||
(to)->debug_sf.name = func; \
|
||
} while (0)
|
||
|
||
COPY_SF_PTR (real_sf, debug_data, sym_new_init, debug_sym_new_init);
|
||
COPY_SF_PTR (real_sf, debug_data, sym_init, debug_sym_init);
|
||
COPY_SF_PTR (real_sf, debug_data, sym_read, debug_sym_read);
|
||
COPY_SF_PTR (real_sf, debug_data, sym_read_psymbols,
|
||
debug_sym_read_psymbols);
|
||
COPY_SF_PTR (real_sf, debug_data, sym_finish, debug_sym_finish);
|
||
COPY_SF_PTR (real_sf, debug_data, sym_offsets, debug_sym_offsets);
|
||
COPY_SF_PTR (real_sf, debug_data, sym_segments, debug_sym_segments);
|
||
COPY_SF_PTR (real_sf, debug_data, sym_read_linetable,
|
||
debug_sym_read_linetable);
|
||
COPY_SF_PTR (real_sf, debug_data, sym_relocate, debug_sym_relocate);
|
||
if (real_sf->sym_probe_fns)
|
||
debug_data->debug_sf.sym_probe_fns = &debug_sym_probe_fns;
|
||
debug_data->debug_sf.qf = &debug_sym_quick_functions;
|
||
|
||
#undef COPY_SF_PTR
|
||
|
||
debug_data->real_sf = real_sf;
|
||
set_objfile_data (objfile, symfile_debug_objfile_data_key, debug_data);
|
||
objfile->sf = &debug_data->debug_sf;
|
||
}
|
||
|
||
/* Uninstall the debugging versions of the symfile functions for OBJFILE.
|
||
Do not call this if the debug versions are not installed. */
|
||
|
||
static void
|
||
uninstall_symfile_debug_logging (struct objfile *objfile)
|
||
{
|
||
struct debug_sym_fns_data *debug_data;
|
||
|
||
/* The debug versions should be currently installed. */
|
||
gdb_assert (symfile_debug_installed (objfile));
|
||
|
||
debug_data = ((struct debug_sym_fns_data *)
|
||
objfile_data (objfile, symfile_debug_objfile_data_key));
|
||
|
||
objfile->sf = debug_data->real_sf;
|
||
xfree (debug_data);
|
||
set_objfile_data (objfile, symfile_debug_objfile_data_key, NULL);
|
||
}
|
||
|
||
/* Call this function to set OBJFILE->SF.
|
||
Do not set OBJFILE->SF directly. */
|
||
|
||
void
|
||
objfile_set_sym_fns (struct objfile *objfile, const struct sym_fns *sf)
|
||
{
|
||
if (symfile_debug_installed (objfile))
|
||
{
|
||
gdb_assert (debug_symfile);
|
||
/* Remove the current one, and reinstall a new one later. */
|
||
uninstall_symfile_debug_logging (objfile);
|
||
}
|
||
|
||
/* Assume debug logging is disabled. */
|
||
objfile->sf = sf;
|
||
|
||
/* Turn debug logging on if enabled. */
|
||
if (debug_symfile)
|
||
install_symfile_debug_logging (objfile);
|
||
}
|
||
|
||
static void
|
||
set_debug_symfile (const char *args, int from_tty, struct cmd_list_element *c)
|
||
{
|
||
struct program_space *pspace;
|
||
struct objfile *objfile;
|
||
|
||
ALL_PSPACES (pspace)
|
||
ALL_PSPACE_OBJFILES (pspace, objfile)
|
||
{
|
||
if (debug_symfile)
|
||
{
|
||
if (!symfile_debug_installed (objfile))
|
||
install_symfile_debug_logging (objfile);
|
||
}
|
||
else
|
||
{
|
||
if (symfile_debug_installed (objfile))
|
||
uninstall_symfile_debug_logging (objfile);
|
||
}
|
||
}
|
||
}
|
||
|
||
static void
|
||
show_debug_symfile (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("Symfile debugging is %s.\n"), value);
|
||
}
|
||
|
||
void
|
||
_initialize_symfile_debug (void)
|
||
{
|
||
symfile_debug_objfile_data_key
|
||
= register_objfile_data_with_cleanup (NULL, symfile_debug_free_objfile);
|
||
|
||
add_setshow_boolean_cmd ("symfile", no_class, &debug_symfile, _("\
|
||
Set debugging of the symfile functions."), _("\
|
||
Show debugging of the symfile functions."), _("\
|
||
When enabled, all calls to the symfile functions are logged."),
|
||
set_debug_symfile, show_debug_symfile,
|
||
&setdebuglist, &showdebuglist);
|
||
|
||
/* Note: We don't need a new-objfile observer because debug logging
|
||
will be installed when objfile init'n calls objfile_set_sym_fns. */
|
||
}
|