2003-10-20 Andrew Cagney <cagney@redhat.com>

* values.c (register_value_being_returned): Update comments.  Use
	"gdbarch_return_value" when available.
	(using_struct_return): Ditto.
	(set_return_value): Ditto.  Use "gdbarch_return_value" when
	available..  Print a warning, and not an error, when an unhandled
	return type is encountered.
	* infcmd.c: Include "gdb_assert.h".
	(print_return_value): When gdbarch_return_value_p, and using
	struct return, assume that the value is not available.
	* defs.h (return_value_convention): Define.
	* gdbarch.sh (gdbarch_return_value): New predicate method.
	* gdbarch.h, gdbarch.c: Re-generate
	* ppc-sysv-tdep.c (return_value_convention): Delete definition.

Index: doc/ChangeLog
2003-10-20  Andrew Cagney  <cagney@redhat.com>

	* gdbint.texinfo (Target Architecture Definition): Document
	gdbarch_return_value.  Add cross references from
	USE_STRUCT_CONVENTION, EXTRACT_RETURN_VALUE, and
	STORE_RETURN_VALUE, and from/to EXTRACT_STRUCT_VALUE_ADDRESS.

gdb/defs.h

@@ -230,6 +230,21 @@ enum auto_boolean
   AUTO_BOOLEAN_AUTO
 };
 
+/* Potential ways that a function can return a value of a given type.  */
+enum return_value_convention
+{
+  /* Where the return value has been squeezed into one or more
+     registers.  */
+  RETURN_VALUE_REGISTER_CONVENTION,
+  /* Commonly known as the "struct return convention".  The caller
+     passes an additional hidden first parameter to the caller.  That
+     parameter contains the address at which the value being returned
+     should be stored.  While typically, and historically, used for
+     large structs, this is convention is applied to values of many
+     different types.  */
+  RETURN_VALUE_STRUCT_CONVENTION
+};
+
 /* the cleanup list records things that have to be undone
    if an error happens (descriptors to be closed, memory to be freed, etc.)
    Each link in the chain records a function to call and an