Fix to prevent tail-call optimisation. Fix also includes adjustment to

stack size, plus ASM niceities.
a=leaf r=rogerl
Bug id #15604

xpcom/reflect/xptcall/src/md/unix/xptcinvoke_asm_sparc_solaris_GCC.s

@@ -28,8 +28,8 @@
     
 */
 XPTC_InvokeByIndex:
-        save    %sp,-(64 + 16),%sp   ! room for the register window and
-                                    ! struct pointer, rounded up to 0 % 16
+        save    %sp,-(64 + 32),%sp   ! room for the register window and
+                                    ! struct pointer, rounded up to 0 % 32
         mov     %i2,%o0             ! paramCount
         call    invoke_count_words  ! returns the required stack size in %o0
         mov     %i3,%o1             ! params

xpcom/reflect/xptcall/src/md/unix/xptcinvoke_asm_sparc_solaris_SUNW.s

@@ -30,8 +30,8 @@
     
 */
 XPTC_InvokeByIndex:
-        save    %sp,-(64 + 16),%sp  ! room for the register window and
-                                    ! struct pointer, rounded up to 0 % 16
+        save    %sp,-(64 + 32),%sp  ! room for the register window and
+                                    ! struct pointer, rounded up to 0 % 32
         sll     %i2,3,%l0           ! assume the worst case
                                     ! paramCount * 2 * 4 bytes
         cmp     %l0, 0              ! are there any args? If not,
@@ -56,7 +56,7 @@ XPTC_InvokeByIndex:
 !
 !   calculate the target address from the vtable
 !
-invoke:
+.invoke:
         sll     %i1,2,%l0           ! index *= 4
         add     %l0,8,%l0           ! there are 2 extra entries in the vTable
         ld      [%i0],%l1           ! *that --> address of vtable
@@ -68,3 +68,5 @@ invoke:
         mov     %o0,%i0             ! propogate return value
         ret
         restore
+
+        .size    XPTC_InvokeByIndex, .-XPTC_InvokeByIndex

xpcom/reflect/xptcall/src/md/unix/xptcstubs_asm_sparc_solaris.s

@@ -43,8 +43,8 @@ SharedStub:
         st      %i4, [%fp + 84]
         st      %i5, [%fp + 88]
 ! now we can build our own stack frame
-        save    %sp,-(64 + 16),%sp   ! room for the register window and
-                                    ! struct pointer, rounded up to 0 % 16
+        save    %sp,-(64 + 32),%sp   ! room for the register window and
+                                    ! struct pointer, rounded up to 0 % 32
 ! our function now appears to have been called
 ! as SharedStub(nsISupports* that, PRUint32 index, PRUint32* args)
 ! so we can just copy these through
@@ -60,3 +60,6 @@ SharedStub:
 .LL1:
         ret
         restore
+
+       .size    SharedStub, .-SharedStub
+       .type    SharedStub, #function

xpcom/reflect/xptcall/src/md/unix/xptcstubs_sparc_solaris.cpp

@@ -110,13 +110,14 @@ PrepareAndDispatch(nsXPTCStubBase* self, uint32 methodIndex, uint32* args)
     return result;
 }
 
-extern "C" int SharedStub(int);
+extern "C" int SharedStub(int, int*);
 
 #define STUB_ENTRY(n) \
 nsresult nsXPTCStubBase::Stub##n() \
 { \
-    return SharedStub(n);   \
-}                           \
+	int dummy; /* defeat tail-call optimization */ \
+	return SharedStub(n, &dummy); \
+}
 
 #define SENTINEL_ENTRY(n) \
 nsresult nsXPTCStubBase::Sentinel##n() \