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* eval.c (evaluate_subexp_standard) [OP_OBJC_MSGCALL]: Support

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platforms that use function descriptors.  Prefer to use function
	pointer types instead of function types.
	* linespec.c (decode_objc): Support function descriptors.  Fully
	initialize SAL result.
	* objc-lang.c (find_methods): Support function descriptors.
	Do not require function symbol to point to text section.

	* ppc-sysv-tdep.c (ppc64_sysv_abi_push_dummy_call): When calling
	via a function pointer, use the descriptor it points to.
This commit is contained in:
Ulrich Weigand 2009-09-29 00:48:32 +00:00
parent 67f470de12
commit 69368a60a4
5 changed files with 61 additions and 20 deletions
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13
gdb/ChangeLog
View File

@ -1,3 +1,16 @@
2009-09-28 Ulrich Weigand <uweigand@de.ibm.com>
* eval.c (evaluate_subexp_standard) [OP_OBJC_MSGCALL]: Support
platforms that use function descriptors. Prefer to use function
pointer types instead of function types.
* linespec.c (decode_objc): Support function descriptors. Fully
initialize SAL result.
* objc-lang.c (find_methods): Support function descriptors.
Do not require function symbol to point to text section.
* ppc-sysv-tdep.c (ppc64_sysv_abi_push_dummy_call): When calling
via a function pointer, use the descriptor it points to.
2009-09-28 Jan Kratochvil <jan.kratochvil@redhat.com>
Fix ia64 breakpoints in the L-X slot.

24
gdb/eval.c
View File

@ -1161,8 +1161,13 @@ evaluate_subexp_standard (struct type *expect_type,
if (addr)
{
struct symbol *sym = NULL;
/* Is it a high_level symbol? */
/* The address might point to a function descriptor;
resolve it to the actual code address instead. */
addr = gdbarch_convert_from_func_ptr_addr (exp->gdbarch, addr,
&current_target);
/* Is it a high_level symbol? */
sym = find_pc_function (addr);
if (sym != NULL)
method = value_of_variable (sym, 0);
@ -1216,11 +1221,20 @@ evaluate_subexp_standard (struct type *expect_type,
{
if (TYPE_CODE (value_type (method)) != TYPE_CODE_FUNC)
error (_("method address has symbol information with non-function type; skipping"));
/* Create a function pointer of the appropriate type, and replace
its value with the value of msg_send or msg_send_stret. We must
use a pointer here, as msg_send and msg_send_stret are of pointer
type, and the representation may be different on systems that use
function descriptors. */
if (struct_return)
set_value_address (method, value_as_address (msg_send_stret));
called_method
= value_from_pointer (lookup_pointer_type (value_type (method)),
value_as_address (msg_send_stret));
else
set_value_address (method, value_as_address (msg_send));
called_method = method;
called_method
= value_from_pointer (lookup_pointer_type (value_type (method)),
value_as_address (msg_send));
}
else
{
@ -1275,7 +1289,7 @@ evaluate_subexp_standard (struct type *expect_type,
{
/* Function objc_msg_lookup returns a pointer. */
deprecated_set_value_type (argvec[0],
lookup_function_type (lookup_pointer_type (value_type (argvec[0]))));
lookup_pointer_type (lookup_function_type (value_type (argvec[0]))));
argvec[0] = call_function_by_hand (argvec[0], nargs + 2, argvec + 1);
}

18
gdb/linespec.c
View File

@ -1172,11 +1172,19 @@ decode_objc (char **argptr, int funfirstline, struct symtab *file_symtab,
}
else
{
/* The only match was a non-debuggable symbol. */
values.sals[0].symtab = NULL;
values.sals[0].line = 0;
values.sals[0].end = 0;
values.sals[0].pc = SYMBOL_VALUE_ADDRESS (sym_arr[0]);
/* The only match was a non-debuggable symbol, which might point
to a function descriptor; resolve it to the actual code address
instead. */
struct minimal_symbol *msymbol = (struct minimal_symbol *)sym_arr[0];
struct objfile *objfile = msymbol_objfile (msymbol);
struct gdbarch *gdbarch = get_objfile_arch (objfile);
CORE_ADDR pc = SYMBOL_VALUE_ADDRESS (msymbol);
pc = gdbarch_convert_from_func_ptr_addr (gdbarch, pc,
&current_target);
init_sal (&values.sals[0]);
values.sals[0].pc = pc;
}
return values;
}

16
gdb/objc-lang.c
View File

@ -1173,16 +1173,18 @@ find_methods (struct symtab *symtab, char type,
ALL_OBJFILE_MSYMBOLS (objfile, msymbol)
{
struct gdbarch *gdbarch = get_objfile_arch (objfile);
CORE_ADDR pc = SYMBOL_VALUE_ADDRESS (msymbol);
QUIT;
if ((MSYMBOL_TYPE (msymbol) != mst_text)
&& (MSYMBOL_TYPE (msymbol) != mst_file_text))
/* Not a function or method. */
continue;
/* The minimal symbol might point to a function descriptor;
resolve it to the actual code address instead. */
pc = gdbarch_convert_from_func_ptr_addr (gdbarch, pc,
&current_target);
if (symtab)
if ((SYMBOL_VALUE_ADDRESS (msymbol) < BLOCK_START (block)) ||
(SYMBOL_VALUE_ADDRESS (msymbol) >= BLOCK_END (block)))
if (pc < BLOCK_START (block) || pc >= BLOCK_END (block))
/* Not in the specified symtab. */
continue;
@ -1221,7 +1223,7 @@ find_methods (struct symtab *symtab, char type,
((nselector == NULL) || (strcmp (selector, nselector) != 0)))
continue;
sym = find_pc_function (SYMBOL_VALUE_ADDRESS (msymbol));
sym = find_pc_function (pc);
if (sym != NULL)
{
const char *newsymname = SYMBOL_NATURAL_NAME (sym);

10
gdb/ppc-sysv-tdep.c
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@ -1326,10 +1326,14 @@ ppc64_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr);
/* Use the func_addr to find the descriptor, and use that to find
the TOC. */
the TOC. If we're calling via a function pointer, the pointer
itself identifies the descriptor. */
{
CORE_ADDR desc_addr;
if (convert_code_addr_to_desc_addr (func_addr, &desc_addr))
struct type *ftype = check_typedef (value_type (function));
CORE_ADDR desc_addr = value_as_address (function);
if (TYPE_CODE (ftype) == TYPE_CODE_PTR
|| convert_code_addr_to_desc_addr (func_addr, &desc_addr))
{
/* The TOC is the second double word in the descriptor. */
CORE_ADDR toc =