Implement subclassing Arrays.

src/mips/code-stubs-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 4804 matching lines @@
   } else if (argument_count() == MORE_THAN_ONE) {
     CreateArrayDispatch<ArrayNArgumentsConstructorStub>(masm, mode);
   } else {
     UNREACHABLE();
   }
 }
 
 
 void ArrayConstructorStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
-  //  -- a0 : argc (only if argument_count() == ANY)
+  //  -- a0 : argc (only if argument_count() is ANY or MORE_THAN_ONE)
   //  -- a1 : constructor
   //  -- a2 : AllocationSite or undefined
   //  -- a3 : Original constructor
-  //  -- sp[0] : return address
-  //  -- sp[4] : last argument
+  //  -- sp[0] : last argument
   // -----------------------------------
 
   if (FLAG_debug_code) {
     // The array construct code is only set for the global and natives
     // builtin Array functions which always have maps.
 
     // Initial map for the builtin Array function should be a map.
     __ lw(t0, FieldMemOperand(a1, JSFunction::kPrototypeOrInitialMapOffset));
     // Will both indicate a NULL and a Smi.
     __ SmiTst(t0, at);
@@ skipping 17 matching lines @@
 
   __ lw(a3, FieldMemOperand(a2, AllocationSite::kTransitionInfoOffset));
   __ SmiUntag(a3);
   STATIC_ASSERT(AllocationSite::ElementsKindBits::kShift == 0);
   __ And(a3, a3, Operand(AllocationSite::ElementsKindBits::kMask));
   GenerateDispatchToArrayStub(masm, DONT_OVERRIDE);
 
   __ bind(&no_info);
   GenerateDispatchToArrayStub(masm, DISABLE_ALLOCATION_SITES);
 
+  // Subclassing.
   __ bind(&subclassing);
-  __ TailCallRuntime(Runtime::kThrowArrayNotSubclassableError, 0, 1);
+  __ Push(a1);
+  __ Push(a3);
+
+  // Adjust argc.
+  switch (argument_count()) {
+    case ANY:
+    case MORE_THAN_ONE:
+      __ li(at, Operand(2));
+      __ addu(a0, a0, at);
+      break;
+    case NONE:
+      __ li(a0, Operand(2));
+      break;
+    case ONE:
+      __ li(a0, Operand(3));
+      break;
+  }
+
+  __ JumpToExternalReference(
+      ExternalReference(Runtime::kArrayConstructorWithSubclassing, isolate()));
 }
 
 
 void InternalArrayConstructorStub::GenerateCase(
     MacroAssembler* masm, ElementsKind kind) {
 
   InternalArrayNoArgumentConstructorStub stub0(isolate(), kind);
   __ TailCallStub(&stub0, lo, a0, Operand(1));
 
   InternalArrayNArgumentsConstructorStub stubN(isolate(), kind);
@@ skipping 367 matching lines @@
                            kStackUnwindSpace, kInvalidStackOffset,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS