MIPS: Port '[x86] Also deal with holey arrays in the Apply builtin.'

src/builtins/mips64/builtins-mips64.cc

Index: src/builtins/mips64/builtins-mips64.cc
diff --git a/src/builtins/mips64/builtins-mips64.cc b/src/builtins/mips64/builtins-mips64.cc
index cec12edb754a4d3d0e0cb8e482d95c822412f545..194e3532b75e788d4b329e6d0ab8ec0c2265f462 100644
--- a/src/builtins/mips64/builtins-mips64.cc
+++ b/src/builtins/mips64/builtins-mips64.cc
@@ -2144,7 +2144,8 @@ void Builtins::Generate_Apply(MacroAssembler* masm) {
 
   // Create the list of arguments from the array-like argumentsList.
   {
-    Label create_arguments, create_array, create_runtime, done_create;
+    Label create_arguments, create_array, create_holey_array, create_runtime,
+        done_create;
     __ JumpIfSmi(arguments_list, &create_runtime);
 
     // Load the map of argumentsList into a2.
@@ -2192,12 +2193,29 @@ void Builtins::Generate_Apply(MacroAssembler* masm) {
 
     __ Branch(&done_create);
 
+    // For holey JSArrays we need to check that the array prototype chain
+    // protector is intact and our prototype is the Array.prototype actually.
+    __ bind(&create_holey_array);
+    __ ld(a2, FieldMemOperand(a2, Map::kPrototypeOffset));
+    __ ld(at, ContextMemOperand(t0, Context::INITIAL_ARRAY_PROTOTYPE_INDEX));
+    __ Branch(&create_runtime, ne, a2, Operand(at));
+    __ LoadRoot(at, Heap::kArrayProtectorRootIndex);
+    __ lw(a2, UntagSmiFieldMemOperand(at, PropertyCell::kValueOffset));
+    __ Branch(&create_runtime, ne, a2,
+              Operand(Smi::FromInt(Isolate::kProtectorValid)));
+    __ lw(a2, UntagSmiFieldMemOperand(a0, JSArray::kLengthOffset));
+    __ ld(a0, FieldMemOperand(a0, JSArray::kElementsOffset));
+    __ Branch(&done_create);
+
     // Try to create the list from a JSArray object.
     __ bind(&create_array);
     __ ld(a2, FieldMemOperand(a2, Map::kBitField2Offset));
     __ DecodeField<Map::ElementsKindBits>(a2);
     STATIC_ASSERT(FAST_SMI_ELEMENTS == 0);
     STATIC_ASSERT(FAST_ELEMENTS == 2);
+    STATIC_ASSERT(FAST_HOLEY_ELEMENTS == 3);
+    __ Branch(&create_holey_array, eq, a2, Operand(FAST_HOLEY_SMI_ELEMENTS));
+    __ Branch(&create_holey_array, eq, a2, Operand(FAST_HOLEY_ELEMENTS));
     __ andi(a2, a2, uint16_t(~FAST_ELEMENTS));  // works if enum ElementsKind
     // has less than 2^16 elements
     __ Branch(&create_runtime, ne, a2, Operand(int64_t(0)));
@@ -2233,7 +2251,7 @@ void Builtins::Generate_Apply(MacroAssembler* masm) {
 
   // Push arguments onto the stack (thisArgument is already on the stack).
   {
-    Label done, loop;
+    Label done, push, loop;
     Register src = a4;
     Register scratch = len;
 
@@ -2242,8 +2260,12 @@ void Builtins::Generate_Apply(MacroAssembler* masm) {
     __ mov(a0, len);  // The 'len' argument for Call() or Construct().
     __ dsll(scratch, len, kPointerSizeLog2);
     __ Dsubu(scratch, sp, Operand(scratch));
+    __ LoadRoot(t1, Heap::kTheHoleValueRootIndex);
     __ bind(&loop);
     __ ld(a5, MemOperand(src));
+    __ Branch(&push, ne, a5, Operand(t1));
+    __ LoadRoot(a5, Heap::kUndefinedValueRootIndex);
+    __ bind(&push);
     __ daddiu(src, src, kPointerSize);
     __ Push(a5);
     __ Branch(&loop, ne, scratch, Operand(sp));