/* Symbol table lookup for the GNU debugger, GDB.
- Copyright (C) 1986-2014 Free Software Foundation, Inc.
+ Copyright (C) 1986-2015 Free Software Foundation, Inc.
This file is part of GDB.
const domain_enum domain,
enum language language);
-static
-struct symbol *lookup_symbol_via_quick_fns (struct objfile *objfile,
- int block_index,
- const char *name,
- const domain_enum domain);
+static struct symbol *
+ lookup_symbol_in_objfile (struct objfile *objfile, int block_index,
+ const char *name, const domain_enum domain);
extern initialize_file_ftype _initialize_symtab;
/* When non-zero, print debugging messages related to symtab creation. */
unsigned int symtab_create_debug = 0;
+/* When non-zero, print debugging messages related to symbol lookup. */
+unsigned int symbol_lookup_debug = 0;
+
/* Non-zero if a file may be known by two different basenames.
This is the uncommon case, and significantly slows down gdb.
Default set to "off" to not slow down the common case. */
case UNDEF_DOMAIN: return "UNDEF_DOMAIN";
case VAR_DOMAIN: return "VAR_DOMAIN";
case STRUCT_DOMAIN: return "STRUCT_DOMAIN";
+ case MODULE_DOMAIN: return "MODULE_DOMAIN";
case LABEL_DOMAIN: return "LABEL_DOMAIN";
case COMMON_BLOCK_DOMAIN: return "COMMON_BLOCK_DOMAIN";
default: gdb_assert_not_reached ("bad domain_enum");
return (mangled_name);
}
-/* Initialize the cplus_specific structure. 'cplus_specific' should
- only be allocated for use with cplus symbols. */
-
-static void
-symbol_init_cplus_specific (struct general_symbol_info *gsymbol,
- struct obstack *obstack)
-{
- /* A language_specific structure should not have been previously
- initialized. */
- gdb_assert (gsymbol->language_specific.cplus_specific == NULL);
- gdb_assert (obstack != NULL);
-
- gsymbol->language_specific.cplus_specific =
- OBSTACK_ZALLOC (obstack, struct cplus_specific);
-}
-
/* Set the demangled name of GSYMBOL to NAME. NAME must be already
- correctly allocated. For C++ symbols a cplus_specific struct is
- allocated so OBJFILE must not be NULL. If this is a non C++ symbol
- OBJFILE can be NULL. */
+ correctly allocated. */
void
symbol_set_demangled_name (struct general_symbol_info *gsymbol,
const char *name,
struct obstack *obstack)
{
- if (gsymbol->language == language_cplus)
- {
- if (gsymbol->language_specific.cplus_specific == NULL)
- symbol_init_cplus_specific (gsymbol, obstack);
-
- gsymbol->language_specific.cplus_specific->demangled_name = name;
- }
- else if (gsymbol->language == language_ada)
+ if (gsymbol->language == language_ada)
{
if (name == NULL)
{
const char *
symbol_get_demangled_name (const struct general_symbol_info *gsymbol)
{
- if (gsymbol->language == language_cplus)
- {
- if (gsymbol->language_specific.cplus_specific != NULL)
- return gsymbol->language_specific.cplus_specific->demangled_name;
- else
- return NULL;
- }
- else if (gsymbol->language == language_ada)
+ if (gsymbol->language == language_ada)
{
if (!gsymbol->ada_mangled)
return NULL;
struct obstack *obstack)
{
gsymbol->language = language;
- if (gsymbol->language == language_d
+ if (gsymbol->language == language_cplus
+ || gsymbol->language == language_d
|| gsymbol->language == language_go
|| gsymbol->language == language_java
|| gsymbol->language == language_objc
gdb_assert (gsymbol->ada_mangled == 0);
gsymbol->language_specific.obstack = obstack;
}
- else if (gsymbol->language == language_cplus)
- gsymbol->language_specific.cplus_specific = NULL;
else
{
memset (&gsymbol->language_specific, 0,
if (!sym)
return NULL;
+ if (!SYMBOL_OBJFILE_OWNED (sym))
+ return sym;
+
/* We either have an OBJFILE, or we can get at it from the sym's
symtab. Anything else is a bug. */
- gdb_assert (objfile || SYMBOL_SYMTAB (sym));
+ gdb_assert (objfile || symbol_symtab (sym));
if (objfile == NULL)
- objfile = SYMBOL_OBJFILE (sym);
+ objfile = symbol_objfile (sym);
if (SYMBOL_OBJ_SECTION (objfile, sym))
return sym;
if (lang->la_name_of_this == NULL || block == NULL)
return NULL;
+ if (symbol_lookup_debug > 1)
+ {
+ struct objfile *objfile = lookup_objfile_from_block (block);
+
+ fprintf_unfiltered (gdb_stdlog,
+ "lookup_language_this (%s, %s (objfile %s))",
+ lang->la_name, host_address_to_string (block),
+ objfile_debug_name (objfile));
+ }
+
while (block)
{
struct symbol *sym;
sym = block_lookup_symbol (block, lang->la_name_of_this, VAR_DOMAIN);
if (sym != NULL)
{
+ if (symbol_lookup_debug > 1)
+ {
+ fprintf_unfiltered (gdb_stdlog, " = %s (%s, block %s)\n",
+ SYMBOL_PRINT_NAME (sym),
+ host_address_to_string (sym),
+ host_address_to_string (block));
+ }
block_found = block;
return sym;
}
block = BLOCK_SUPERBLOCK (block);
}
+ if (symbol_lookup_debug > 1)
+ fprintf_unfiltered (gdb_stdlog, " = NULL\n");
return NULL;
}
struct symbol *sym;
const struct language_defn *langdef;
+ if (symbol_lookup_debug)
+ {
+ struct objfile *objfile = lookup_objfile_from_block (block);
+
+ fprintf_unfiltered (gdb_stdlog,
+ "lookup_symbol_aux (%s, %s (objfile %s), %s, %s)\n",
+ name, host_address_to_string (block),
+ objfile != NULL
+ ? objfile_debug_name (objfile) : "NULL",
+ domain_name (domain), language_str (language));
+ }
+
+ /* Initialize block_found so that the language la_lookup_symbol_nonlocal
+ routines don't have to set it (to NULL) if a primitive type is found.
+ We do this early so that block_found is also NULL if no symbol is
+ found (though this is not part of the API, and callers cannot assume
+ this). */
+ block_found = NULL;
+
/* Make sure we do something sensible with is_a_field_of_this, since
the callers that set this parameter to some non-null value will
certainly use it later. If we don't set it, the contents of
sym = lookup_local_symbol (name, block, domain, language);
if (sym != NULL)
- return sym;
+ {
+ if (symbol_lookup_debug)
+ {
+ fprintf_unfiltered (gdb_stdlog, "lookup_symbol_aux (...) = %s\n",
+ host_address_to_string (sym));
+ }
+ return sym;
+ }
/* If requested to do so by the caller and if appropriate for LANGUAGE,
check to see if NAME is a field of `this'. */
langdef->la_name_of_this);
if (check_field (t, name, is_a_field_of_this))
- return NULL;
+ {
+ if (symbol_lookup_debug)
+ {
+ fprintf_unfiltered (gdb_stdlog,
+ "lookup_symbol_aux (...) = NULL\n");
+ }
+ return NULL;
+ }
}
}
/* Now do whatever is appropriate for LANGUAGE to look
up static and global variables. */
- sym = langdef->la_lookup_symbol_nonlocal (name, block, domain);
+ sym = langdef->la_lookup_symbol_nonlocal (langdef, name, block, domain);
if (sym != NULL)
- return sym;
+ {
+ if (symbol_lookup_debug)
+ {
+ fprintf_unfiltered (gdb_stdlog, "lookup_symbol_aux (...) = %s\n",
+ host_address_to_string (sym));
+ }
+ return sym;
+ }
/* Now search all static file-level symbols. Not strictly correct,
but more useful than an error. */
- return lookup_static_symbol (name, domain);
+ sym = lookup_static_symbol (name, domain);
+ if (symbol_lookup_debug)
+ {
+ fprintf_unfiltered (gdb_stdlog, "lookup_symbol_aux (...) = %s\n",
+ sym != NULL ? host_address_to_string (sym) : "NULL");
+ }
+ return sym;
}
/* Check to see if the symbol is defined in BLOCK or its superiors.
{
struct symbol *sym;
+ if (symbol_lookup_debug > 1)
+ {
+ struct objfile *objfile = lookup_objfile_from_block (block);
+
+ fprintf_unfiltered (gdb_stdlog,
+ "lookup_symbol_in_block (%s, %s (objfile %s), %s)",
+ name, host_address_to_string (block),
+ objfile_debug_name (objfile),
+ domain_name (domain));
+ }
+
sym = block_lookup_symbol (block, name, domain);
if (sym)
{
+ if (symbol_lookup_debug > 1)
+ {
+ fprintf_unfiltered (gdb_stdlog, " = %s\n",
+ host_address_to_string (sym));
+ }
block_found = block;
return fixup_symbol_section (sym, NULL);
}
+ if (symbol_lookup_debug > 1)
+ fprintf_unfiltered (gdb_stdlog, " = NULL\n");
return NULL;
}
/* See symtab.h. */
struct symbol *
-lookup_global_symbol_from_objfile (const struct objfile *main_objfile,
+lookup_global_symbol_from_objfile (struct objfile *main_objfile,
const char *name,
const domain_enum domain)
{
- const struct objfile *objfile;
+ struct objfile *objfile;
for (objfile = main_objfile;
objfile;
objfile = objfile_separate_debug_iterate (main_objfile, objfile))
{
- struct compunit_symtab *cust;
- struct symbol *sym;
-
- /* Go through symtabs. */
- ALL_OBJFILE_COMPUNITS (objfile, cust)
- {
- const struct blockvector *bv;
- const struct block *block;
-
- bv = COMPUNIT_BLOCKVECTOR (cust);
- block = BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK);
- sym = block_lookup_symbol (block, name, domain);
- if (sym)
- {
- block_found = block;
- return fixup_symbol_section (sym, (struct objfile *)objfile);
- }
- }
+ struct symbol *sym = lookup_symbol_in_objfile (objfile, GLOBAL_BLOCK,
+ name, domain);
- sym = lookup_symbol_via_quick_fns ((struct objfile *) objfile,
- GLOBAL_BLOCK, name, domain);
- if (sym)
+ if (sym != NULL)
return sym;
}
{
struct compunit_symtab *cust;
+ gdb_assert (block_index == GLOBAL_BLOCK || block_index == STATIC_BLOCK);
+
+ if (symbol_lookup_debug > 1)
+ {
+ fprintf_unfiltered (gdb_stdlog,
+ "lookup_symbol_in_objfile_symtabs (%s, %s, %s, %s)",
+ objfile_debug_name (objfile),
+ block_index == GLOBAL_BLOCK
+ ? "GLOBAL_BLOCK" : "STATIC_BLOCK",
+ name, domain_name (domain));
+ }
+
ALL_OBJFILE_COMPUNITS (objfile, cust)
{
const struct blockvector *bv;
bv = COMPUNIT_BLOCKVECTOR (cust);
block = BLOCKVECTOR_BLOCK (bv, block_index);
- sym = block_lookup_symbol (block, name, domain);
+ sym = block_lookup_symbol_primary (block, name, domain);
if (sym)
{
+ if (symbol_lookup_debug > 1)
+ {
+ fprintf_unfiltered (gdb_stdlog, " = %s (block %s)\n",
+ host_address_to_string (sym),
+ host_address_to_string (block));
+ }
block_found = block;
return fixup_symbol_section (sym, objfile);
}
}
+ if (symbol_lookup_debug > 1)
+ fprintf_unfiltered (gdb_stdlog, " = NULL\n");
return NULL;
}
if (!objfile->sf)
return NULL;
+
+ if (symbol_lookup_debug > 1)
+ {
+ fprintf_unfiltered (gdb_stdlog,
+ "lookup_symbol_via_quick_fns (%s, %s, %s, %s)\n",
+ objfile_debug_name (objfile),
+ block_index == GLOBAL_BLOCK
+ ? "GLOBAL_BLOCK" : "STATIC_BLOCK",
+ name, domain_name (domain));
+ }
+
cust = objfile->sf->qf->lookup_symbol (objfile, block_index, name, domain);
if (cust == NULL)
- return NULL;
+ {
+ if (symbol_lookup_debug > 1)
+ {
+ fprintf_unfiltered (gdb_stdlog,
+ "lookup_symbol_via_quick_fns (...) = NULL\n");
+ }
+ return NULL;
+ }
bv = COMPUNIT_BLOCKVECTOR (cust);
block = BLOCKVECTOR_BLOCK (bv, block_index);
sym = block_lookup_symbol (block, name, domain);
if (!sym)
error_in_psymtab_expansion (block_index, name, cust);
+
+ if (symbol_lookup_debug > 1)
+ {
+ fprintf_unfiltered (gdb_stdlog,
+ "lookup_symbol_via_quick_fns (...) = %s (block %s)\n",
+ host_address_to_string (sym),
+ host_address_to_string (block));
+ }
+
block_found = block;
return fixup_symbol_section (sym, objfile);
}
/* See symtab.h. */
struct symbol *
-basic_lookup_symbol_nonlocal (const char *name,
+basic_lookup_symbol_nonlocal (const struct language_defn *langdef,
+ const char *name,
const struct block *block,
const domain_enum domain)
{
if (sym != NULL)
return sym;
+ /* If we didn't find a definition for a builtin type in the static block,
+ search for it now. This is actually the right thing to do and can be
+ a massive performance win. E.g., when debugging a program with lots of
+ shared libraries we could search all of them only to find out the
+ builtin type isn't defined in any of them. This is common for types
+ like "void". */
+ if (domain == VAR_DOMAIN)
+ {
+ struct gdbarch *gdbarch;
+
+ if (block == NULL)
+ gdbarch = target_gdbarch ();
+ else
+ gdbarch = block_gdbarch (block);
+ sym = language_lookup_primitive_type_as_symbol (langdef, gdbarch, name);
+ if (sym != NULL)
+ return sym;
+ }
+
return lookup_global_symbol (name, block, domain);
}
const domain_enum domain)
{
const struct block *static_block = block_static_block (block);
+ struct symbol *sym;
- if (static_block != NULL)
- return lookup_symbol_in_block (name, static_block, domain);
- else
+ if (static_block == NULL)
return NULL;
+
+ if (symbol_lookup_debug)
+ {
+ struct objfile *objfile = lookup_objfile_from_block (static_block);
+
+ fprintf_unfiltered (gdb_stdlog,
+ "lookup_symbol_in_static_block (%s, %s (objfile %s),"
+ " %s)\n",
+ name,
+ host_address_to_string (block),
+ objfile_debug_name (objfile),
+ domain_name (domain));
+ }
+
+ sym = lookup_symbol_in_block (name, static_block, domain);
+ if (symbol_lookup_debug)
+ {
+ fprintf_unfiltered (gdb_stdlog,
+ "lookup_symbol_in_static_block (...) = %s\n",
+ sym != NULL ? host_address_to_string (sym) : "NULL");
+ }
+ return sym;
}
/* Perform the standard symbol lookup of NAME in OBJFILE:
{
struct symbol *result;
+ if (symbol_lookup_debug)
+ {
+ fprintf_unfiltered (gdb_stdlog,
+ "lookup_symbol_in_objfile (%s, %s, %s, %s)\n",
+ objfile_debug_name (objfile),
+ block_index == GLOBAL_BLOCK
+ ? "GLOBAL_BLOCK" : "STATIC_BLOCK",
+ name, domain_name (domain));
+ }
+
result = lookup_symbol_in_objfile_symtabs (objfile, block_index,
name, domain);
- if (result == NULL)
+ if (result != NULL)
{
- result = lookup_symbol_via_quick_fns (objfile, block_index,
- name, domain);
+ if (symbol_lookup_debug)
+ {
+ fprintf_unfiltered (gdb_stdlog,
+ "lookup_symbol_in_objfile (...) = %s"
+ " (in symtabs)\n",
+ host_address_to_string (result));
+ }
+ return result;
}
+ result = lookup_symbol_via_quick_fns (objfile, block_index,
+ name, domain);
+ if (symbol_lookup_debug)
+ {
+ fprintf_unfiltered (gdb_stdlog,
+ "lookup_symbol_in_objfile (...) = %s%s\n",
+ result != NULL
+ ? host_address_to_string (result)
+ : "NULL",
+ result != NULL ? " (via quick fns)" : "");
+ }
return result;
}
find_function_start_sal (struct symbol *sym, int funfirstline)
{
struct symtab_and_line sal;
+ struct obj_section *section;
fixup_symbol_section (sym, NULL);
- sal = find_pc_sect_line (BLOCK_START (SYMBOL_BLOCK_VALUE (sym)),
- SYMBOL_OBJ_SECTION (SYMBOL_OBJFILE (sym), sym), 0);
+ section = SYMBOL_OBJ_SECTION (symbol_objfile (sym), sym);
+ sal = find_pc_sect_line (BLOCK_START (SYMBOL_BLOCK_VALUE (sym)), section, 0);
/* We always should have a line for the function start address.
If we don't, something is odd. Create a plain SAL refering
init_sal (&sal);
sal.pspace = current_program_space;
sal.pc = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
- sal.section = SYMBOL_OBJ_SECTION (SYMBOL_OBJFILE (sym), sym);
+ sal.section = section;
}
if (funfirstline)
{
fixup_symbol_section (sym, NULL);
+ objfile = symbol_objfile (sym);
pc = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
- section = SYMBOL_OBJ_SECTION (SYMBOL_OBJFILE (sym), sym);
+ section = SYMBOL_OBJ_SECTION (objfile, sym);
name = SYMBOL_LINKAGE_NAME (sym);
- objfile = SYMBOL_OBJFILE (sym);
}
else
{
/* Be conservative - allow direct PC (without skipping prologue) only if we
have proven the CU (Compilation Unit) supports it. sal->SYMTAB does not
have to be set by the caller so we use SYM instead. */
- if (sym && COMPUNIT_LOCATIONS_VALID (SYMTAB_COMPUNIT (SYMBOL_SYMTAB (sym))))
+ if (sym != NULL
+ && COMPUNIT_LOCATIONS_VALID (SYMTAB_COMPUNIT (symbol_symtab (sym))))
force_skip = 0;
saved_pc = pc;
is aligned. */
if (!force_skip && sym && start_sal.symtab == NULL)
{
- pc = skip_prologue_using_lineinfo (pc, SYMBOL_SYMTAB (sym));
+ pc = skip_prologue_using_lineinfo (pc, symbol_symtab (sym));
/* Recalculate the line number. */
start_sal = find_pc_sect_line (pc, section, 0);
}
&& SYMBOL_LINE (BLOCK_FUNCTION (function_block)) != 0)
{
sal->line = SYMBOL_LINE (BLOCK_FUNCTION (function_block));
- sal->symtab = SYMBOL_SYMTAB (BLOCK_FUNCTION (function_block));
+ sal->symtab = symbol_symtab (BLOCK_FUNCTION (function_block));
}
}
struct symbol_search *sym_b = *(struct symbol_search **) sb;
int c;
- c = FILENAME_CMP (sym_a->symtab->filename, sym_b->symtab->filename);
+ c = FILENAME_CMP (symbol_symtab (sym_a->symbol)->filename,
+ symbol_symtab (sym_b->symbol)->filename);
if (c != 0)
return c;
b = BLOCKVECTOR_BLOCK (bv, i);
ALL_BLOCK_SYMBOLS (b, iter, sym)
{
- struct symtab *real_symtab = SYMBOL_SYMTAB (sym);
+ struct symtab *real_symtab = symbol_symtab (sym);
QUIT;
struct symbol_search *psr = (struct symbol_search *)
xmalloc (sizeof (struct symbol_search));
psr->block = i;
- psr->symtab = real_symtab;
psr->symbol = sym;
memset (&psr->msymbol, 0, sizeof (psr->msymbol));
psr->next = NULL;
psr->block = i;
psr->msymbol.minsym = msymbol;
psr->msymbol.objfile = objfile;
- psr->symtab = NULL;
psr->symbol = NULL;
psr->next = NULL;
if (tail == NULL)
static void
print_symbol_info (enum search_domain kind,
- struct symtab *s, struct symbol *sym,
+ struct symbol *sym,
int block, const char *last)
{
+ struct symtab *s = symbol_symtab (sym);
const char *s_filename = symtab_to_filename_for_display (s);
if (last == NULL || filename_cmp (last, s_filename) != 0)
else
{
print_symbol_info (kind,
- p->symtab,
p->symbol,
p->block,
last_filename);
- last_filename = symtab_to_filename_for_display (p->symtab);
+ last_filename
+ = symtab_to_filename_for_display (symbol_symtab (p->symbol));
}
}
{
if (p->msymbol.minsym == NULL)
{
- const char *fullname = symtab_to_fullname (p->symtab);
+ struct symtab *symtab = symbol_symtab (p->symbol);
+ const char *fullname = symtab_to_fullname (symtab);
int newlen = (strlen (fullname)
+ strlen (SYMBOL_LINKAGE_NAME (p->symbol))
strcat (string, "'");
break_command (string, from_tty);
print_symbol_info (FUNCTIONS_DOMAIN,
- p->symtab,
p->symbol,
p->block,
- symtab_to_filename_for_display (p->symtab));
+ symtab_to_filename_for_display (symtab));
}
else
{
\f
-/* Initialize the symbol SYM. */
+/* Helper function to initialize the fields of an objfile-owned symbol.
+ It assumed that *SYM is already all zeroes. */
+
+static void
+initialize_objfile_symbol_1 (struct symbol *sym)
+{
+ SYMBOL_OBJFILE_OWNED (sym) = 1;
+ SYMBOL_SECTION (sym) = -1;
+}
+
+/* Initialize the symbol SYM, and mark it as being owned by an objfile. */
void
-initialize_symbol (struct symbol *sym)
+initialize_objfile_symbol (struct symbol *sym)
{
memset (sym, 0, sizeof (*sym));
- SYMBOL_SECTION (sym) = -1;
+ initialize_objfile_symbol_1 (sym);
}
/* Allocate and initialize a new 'struct symbol' on OBJFILE's
struct symbol *result;
result = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct symbol);
- SYMBOL_SECTION (result) = -1;
+ initialize_objfile_symbol_1 (result);
return result;
}
struct template_symbol *result;
result = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct template_symbol);
- SYMBOL_SECTION (&result->base) = -1;
+ initialize_objfile_symbol_1 (&result->base);
return result;
}
+/* See symtab.h. */
+
+struct objfile *
+symbol_objfile (const struct symbol *symbol)
+{
+ gdb_assert (SYMBOL_OBJFILE_OWNED (symbol));
+ return SYMTAB_OBJFILE (symbol->owner.symtab);
+}
+
+/* See symtab.h. */
+
+struct gdbarch *
+symbol_arch (const struct symbol *symbol)
+{
+ if (!SYMBOL_OBJFILE_OWNED (symbol))
+ return symbol->owner.arch;
+ return get_objfile_arch (SYMTAB_OBJFILE (symbol->owner.symtab));
+}
+
+/* See symtab.h. */
+
+struct symtab *
+symbol_symtab (const struct symbol *symbol)
+{
+ gdb_assert (SYMBOL_OBJFILE_OWNED (symbol));
+ return symbol->owner.symtab;
+}
+
+/* See symtab.h. */
+
+void
+symbol_set_symtab (struct symbol *symbol, struct symtab *symtab)
+{
+ gdb_assert (SYMBOL_OBJFILE_OWNED (symbol));
+ symbol->owner.symtab = symtab;
+}
+
\f
void
NULL,
&setdebuglist, &showdebuglist);
+ add_setshow_zuinteger_cmd ("symbol-lookup", no_class, &symbol_lookup_debug,
+ _("\
+Set debugging of symbol lookup."), _("\
+Show debugging of symbol lookup."), _("\
+When enabled (non-zero), symbol lookups are logged."),
+ NULL, NULL,
+ &setdebuglist, &showdebuglist);
+
observer_attach_executable_changed (symtab_observer_executable_changed);
}
projects / deliverable / binutils-gdb.git / blobdiff