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gdb/gdb-objfile-order.patch

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http://sourceware.org/ml/gdb-patches/2012-05/msg01105.html
Subject: [RFA/commit 1/3] Revert "Search global symbols from the expression's block objfile first."
The search order used in this patch breaks global symbol lookups
for certain symbols when copy-relocation is used. A slightly different
search order will be implemented later.
gdb/ChangeLog:
Revert the following patch:
* findvar.c (default_read_var_value): For LOC_UNRESOLVED symbols,
try locating the symbol in the symbol's own objfile first, before
extending the search to all objfiles.
* symtab.c (lookup_symbol_aux_objfile): New function, extracted
out of lookup_symbol_aux_symtabs.
(lookup_symbol_aux_symtabs): Add new parameter "exclude_objfile".
Replace extracted-out code by call to lookup_symbol_aux_objfile.
Do not search EXCLUDE_OBJFILE.
(lookup_static_symbol_aux): Update call to lookup_symbol_aux_symtabs.
(lookup_symbol_global): Search for matches in the block's objfile
first, before searching all other objfiles.
Will commit if patches #2 & #3 are OK.
---
gdb/findvar.c | 10 +-----
gdb/symtab.c | 108 +++++++++++++++++----------------------------------------
2 files changed, 33 insertions(+), 85 deletions(-)
diff --git a/gdb/findvar.c b/gdb/findvar.c
index ed7903c..9009e6f 100644
--- a/gdb/findvar.c
+++ b/gdb/findvar.c
@@ -562,15 +562,7 @@ default_read_var_value (struct symbol *var, struct frame_info *frame)
struct minimal_symbol *msym;
struct obj_section *obj_section;
- /* First, try locating the associated minimal symbol within
- the same objfile. This prevents us from selecting another
- symbol with the same name but located in a different objfile. */
- msym = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (var), NULL,
- SYMBOL_SYMTAB (var)->objfile);
- /* If the lookup failed, try expanding the search to all
- objfiles. */
- if (msym == NULL)
- msym = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (var), NULL, NULL);
+ msym = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (var), NULL, NULL);
if (msym == NULL)
error (_("No global symbol \"%s\"."), SYMBOL_LINKAGE_NAME (var));
if (overlay_debugging)
diff --git a/gdb/symtab.c b/gdb/symtab.c
index 85ddd1d..39d8c6f 100644
--- a/gdb/symtab.c
+++ b/gdb/symtab.c
@@ -95,8 +95,7 @@ struct symbol *lookup_symbol_aux_local (const char *name,
static
struct symbol *lookup_symbol_aux_symtabs (int block_index,
const char *name,
- const domain_enum domain,
- struct objfile *exclude_objfile);
+ const domain_enum domain);
static
struct symbol *lookup_symbol_aux_quick (struct objfile *objfile,
@@ -1360,7 +1359,7 @@ lookup_static_symbol_aux (const char *name, const domain_enum domain)
struct objfile *objfile;
struct symbol *sym;
- sym = lookup_symbol_aux_symtabs (STATIC_BLOCK, name, domain, NULL);
+ sym = lookup_symbol_aux_symtabs (STATIC_BLOCK, name, domain);
if (sym != NULL)
return sym;
@@ -1499,61 +1498,40 @@ lookup_global_symbol_from_objfile (const struct objfile *main_objfile,
return NULL;
}
-/* Check to see if the symbol is defined in one of the OBJFILE's
- symtabs. BLOCK_INDEX should be either GLOBAL_BLOCK or STATIC_BLOCK,
+/* Check to see if the symbol is defined in one of the symtabs.
+ BLOCK_INDEX should be either GLOBAL_BLOCK or STATIC_BLOCK,
depending on whether or not we want to search global symbols or
static symbols. */
static struct symbol *
-lookup_symbol_aux_objfile (struct objfile *objfile, int block_index,
- const char *name, const domain_enum domain)
-{
- struct symbol *sym = NULL;
- struct blockvector *bv;
- const struct block *block;
- struct symtab *s;
-
- if (objfile->sf)
- objfile->sf->qf->pre_expand_symtabs_matching (objfile, block_index,
- name, domain);
-
- ALL_OBJFILE_SYMTABS (objfile, s)
- if (s->primary)
- {
- bv = BLOCKVECTOR (s);
- block = BLOCKVECTOR_BLOCK (bv, block_index);
- sym = lookup_block_symbol (block, name, domain);
- if (sym)
- {
- block_found = block;
- return fixup_symbol_section (sym, objfile);
- }
- }
-
- return NULL;
-}
-
-/* Same as lookup_symbol_aux_objfile, except that it searches all
- objfiles except for EXCLUDE_OBJFILE. Return the first match found.
-
- If EXCLUDE_OBJFILE is NULL, then all objfiles are searched. */
-
-static struct symbol *
lookup_symbol_aux_symtabs (int block_index, const char *name,
- const domain_enum domain,
- struct objfile *exclude_objfile)
+ const domain_enum domain)
{
struct symbol *sym;
struct objfile *objfile;
+ struct blockvector *bv;
+ const struct block *block;
+ struct symtab *s;
ALL_OBJFILES (objfile)
{
- if (objfile != exclude_objfile)
- {
- sym = lookup_symbol_aux_objfile (objfile, block_index, name, domain);
- if (sym)
- return sym;
- }
+ if (objfile->sf)
+ objfile->sf->qf->pre_expand_symtabs_matching (objfile,
+ block_index,
+ name, domain);
+
+ ALL_OBJFILE_SYMTABS (objfile, s)
+ if (s->primary)
+ {
+ bv = BLOCKVECTOR (s);
+ block = BLOCKVECTOR_BLOCK (bv, block_index);
+ sym = lookup_block_symbol (block, name, domain);
+ if (sym)
+ {
+ block_found = block;
+ return fixup_symbol_section (sym, objfile);
+ }
+ }
}
return NULL;
@@ -1679,46 +1657,24 @@ lookup_symbol_global (const char *name,
const domain_enum domain)
{
struct symbol *sym = NULL;
- struct objfile *block_objfile = NULL;
struct objfile *objfile = NULL;
/* Call library-specific lookup procedure. */
- block_objfile = lookup_objfile_from_block (block);
- if (block_objfile != NULL)
- sym = solib_global_lookup (block_objfile, name, domain);
+ objfile = lookup_objfile_from_block (block);
+ if (objfile != NULL)
+ sym = solib_global_lookup (objfile, name, domain);
if (sym != NULL)
return sym;
- /* If BLOCK_OBJFILE is not NULL, then search this objfile first.
- In case the global symbol is defined in multiple objfiles,
- we have a better chance of finding the most relevant symbol. */
-
- if (block_objfile != NULL)
- {
- sym = lookup_symbol_aux_objfile (block_objfile, GLOBAL_BLOCK,
- name, domain);
- if (sym == NULL)
- sym = lookup_symbol_aux_quick (block_objfile, GLOBAL_BLOCK,
- name, domain);
- if (sym != NULL)
- return sym;
- }
-
- /* Symbol not found in the BLOCK_OBJFILE, so try all the other
- objfiles, starting with symtabs first, and then partial symtabs. */
-
- sym = lookup_symbol_aux_symtabs (GLOBAL_BLOCK, name, domain, block_objfile);
+ sym = lookup_symbol_aux_symtabs (GLOBAL_BLOCK, name, domain);
if (sym != NULL)
return sym;
ALL_OBJFILES (objfile)
{
- if (objfile != block_objfile)
- {
- sym = lookup_symbol_aux_quick (objfile, GLOBAL_BLOCK, name, domain);
- if (sym)
- return sym;
- }
+ sym = lookup_symbol_aux_quick (objfile, GLOBAL_BLOCK, name, domain);
+ if (sym)
+ return sym;
}
return NULL;
--
1.7.1
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