[mips] hookize FUNCTION_ARG &co.

[Nathan Froyd <froydnj at codesourcery dot com>]

The patch below hookizes FUNCTION_ARG and related macros for the MIPS
backend.  As with the recently posted rs6000 patch, there's a bit of
churn to get const argument passing right.

Tested on mips-elf.  I plan to commit this under the obvious rule after
waiting a week for comments.

-Nathan

	* config/mips/mips-protos.h (mips_function_arg_advance): Delete
	(mips_function_arg): Delete.
	(mips_function_arg_boundary): Take a const_tree.
	* config/mips/mips.c (mips_function_arg_boundary): Likewise.
	(mips_arg_info): Likewise.
	(mips_setup_incoming_varargs): Call mips_function_arg_advance
	instead of FUNCTION_ARG_ADVANCE.
	(mips_function_arg_advance): Adjust prototype.  Make static.
	(mips_function_arg): Likewise.
	(TARGET_FUNCTION_ARG, TARGET_FUNCTION_ARG_ADVANCE): Likewise.
	* config/mips/mips.h (FUNCTION_ARG_ADVANCE, FUNCTION_ARG): Delete.
	
diff --git a/gcc/config/mips/mips-protos.h b/gcc/config/mips/mips-protos.h
index 6302c3a..be2d6af 100644
--- a/gcc/config/mips/mips-protos.h
+++ b/gcc/config/mips/mips-protos.h
@@ -240,11 +240,7 @@ extern bool mips_expand_block_move (rtx, rtx, rtx);
 extern void mips_expand_synci_loop (rtx, rtx);
 
 extern void mips_init_cumulative_args (CUMULATIVE_ARGS *, tree);
-extern void mips_function_arg_advance (CUMULATIVE_ARGS *, enum machine_mode,
-				       tree, int);
-extern rtx mips_function_arg (const CUMULATIVE_ARGS *,
-			      enum machine_mode, tree, int);
-extern int mips_function_arg_boundary (enum machine_mode, tree);
+extern int mips_function_arg_boundary (enum machine_mode, const_tree);
 extern bool mips_pad_arg_upward (enum machine_mode, const_tree);
 extern bool mips_pad_reg_upward (enum machine_mode, tree);
 
diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c
index e3df236..3b10969 100644
--- a/gcc/config/mips/mips.c
+++ b/gcc/config/mips/mips.c
@@ -4701,7 +4701,7 @@ mips_init_cumulative_args (CUMULATIVE_ARGS *cum, tree fntype)
 
 static void
 mips_get_arg_info (struct mips_arg_info *info, const CUMULATIVE_ARGS *cum,
-		   enum machine_mode mode, tree type, int named)
+		   enum machine_mode mode, const_tree type, bool named)
 {
   bool doubleword_aligned_p;
   unsigned int num_bytes, num_words, max_regs;
@@ -4834,11 +4834,11 @@ mips_strict_argument_naming (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED)
   return !TARGET_OLDABI;
 }
 
-/* Implement FUNCTION_ARG.  */
+/* Implement TARGET_FUNCTION_ARG.  */
 
-rtx
-mips_function_arg (const CUMULATIVE_ARGS *cum, enum machine_mode mode,
-		   tree type, int named)
+static rtx
+mips_function_arg (CUMULATIVE_ARGS *cum, enum machine_mode mode,
+		   const_tree type, bool named)
 {
   struct mips_arg_info info;
 
@@ -4960,11 +4960,11 @@ mips_function_arg (const CUMULATIVE_ARGS *cum, enum machine_mode mode,
   return gen_rtx_REG (mode, mips_arg_regno (&info, TARGET_HARD_FLOAT));
 }
 
-/* Implement FUNCTION_ARG_ADVANCE.  */
+/* Implement TARGET_FUNCTION_ARG_ADVANCE.  */
 
-void
+static void
 mips_function_arg_advance (CUMULATIVE_ARGS *cum, enum machine_mode mode,
-			   tree type, int named)
+			   const_tree type, bool named)
 {
   struct mips_arg_info info;
 
@@ -5013,7 +5013,7 @@ mips_arg_partial_bytes (CUMULATIVE_ARGS *cum,
    to STACK_BOUNDARY bits if the type requires it.  */
 
 int
-mips_function_arg_boundary (enum machine_mode mode, tree type)
+mips_function_arg_boundary (enum machine_mode mode, const_tree type)
 {
   unsigned int alignment;
 
@@ -5346,7 +5346,7 @@ mips_setup_incoming_varargs (CUMULATIVE_ARGS *cum, enum machine_mode mode,
      argument.  Advance a local copy of CUM past the last "real" named
      argument, to find out how many registers are left over.  */
   local_cum = *cum;
-  FUNCTION_ARG_ADVANCE (local_cum, mode, type, true);
+  mips_function_arg_advance (&local_cum, mode, type, true);
 
   /* Found out how many registers we need to save.  */
   gp_saved = MAX_ARGS_IN_REGISTERS - local_cum.num_gprs;
@@ -16469,6 +16469,10 @@ void mips_function_profiler (FILE *file)
 #define TARGET_CALLEE_COPIES mips_callee_copies
 #undef TARGET_ARG_PARTIAL_BYTES
 #define TARGET_ARG_PARTIAL_BYTES mips_arg_partial_bytes
+#undef TARGET_FUNCTION_ARG
+#define TARGET_FUNCTION_ARG mips_function_arg
+#undef TARGET_FUNCTION_ARG_ADVANCE
+#define TARGET_FUNCTION_ARG_ADVANCE mips_function_arg_advance
 
 #undef TARGET_MODE_REP_EXTENDED
 #define TARGET_MODE_REP_EXTENDED mips_mode_rep_extended
diff --git a/gcc/config/mips/mips.h b/gcc/config/mips/mips.h
index c5519b0..cc3ebb4 100644
--- a/gcc/config/mips/mips.h
+++ b/gcc/config/mips/mips.h
@@ -2249,29 +2249,6 @@ typedef struct mips_args {
 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
   mips_init_cumulative_args (&CUM, FNTYPE)
 
-/* Update the data in CUM to advance over an argument
-   of mode MODE and data type TYPE.
-   (TYPE is null for libcalls where that information may not be available.)  */
-
-#define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
-  mips_function_arg_advance (&CUM, MODE, TYPE, NAMED)
-
-/* Determine where to put an argument to a function.
-   Value is zero to push the argument on the stack,
-   or a hard register in which to store the argument.
-
-   MODE is the argument's machine mode.
-   TYPE is the data type of the argument (as a tree).
-    This is null for libcalls where that information may
-    not be available.
-   CUM is a variable of type CUMULATIVE_ARGS which gives info about
-    the preceding args and about the function being called.
-   NAMED is nonzero if this argument is a named parameter
-    (otherwise it is an extra parameter matching an ellipsis).  */
-
-#define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
-  mips_function_arg (&CUM, MODE, TYPE, NAMED)
-
 #define FUNCTION_ARG_BOUNDARY mips_function_arg_boundary
 
 #define FUNCTION_ARG_PADDING(MODE, TYPE) \