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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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24
gdb/eval.c
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@@ -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);
}