Use enum for return method for dummy calls

In call_function_by_hand_dummy, struct_return and hidden_first_param_p
are used to represent a single concept. Replace with an enum.

gdb/ChangeLog:

	* gdbarch.sh (enum function_call_return_method): Add enum.
	* gdbarch.h: Regenerate.
	* infcall.c (call_function_by_hand_dummy): Replace vars with enum.

1 files changed, 23 insertions, 0 deletions

diff --git a/gdb/gdbarch.h b/gdb/gdbarch.h
index 2cb6961..e8e35fb 100644
--- a/gdb/gdbarch.h
+++ b/gdb/gdbarch.h
@@ -102,6 +102,29 @@ typedef void (iterate_over_regset_sections_cb)
   (const char *sect_name, int supply_size, int collect_size,
    const struct regset *regset, const char *human_name, void *cb_data);
 
+/* For a function call, does the function return a value using a
+   normal value return or a structure return - passing a hidden
+   argument pointing to storage.  For the latter, there are two
+   cases: language-mandated structure return and target ABI
+   structure return.  */
+
+enum function_call_return_method
+{
+  /* Standard value return.  */
+  return_method_normal = 0,
+
+  /* Language ABI structure return.  This is handled
+     by passing the return location as the first parameter to
+     the function, even preceding "this".  */
+  return_method_hidden_param,
+
+  /* Target ABI struct return.  This is target-specific; for instance,
+     on ia64 the first argument is passed in out0 but the hidden
+     structure return pointer would normally be passed in r8.  */
+  return_method_struct,
+};
+
+
 
 /* The following are pre-initialized by GDBARCH.  */