ARM: Implement runtime function for array literal transitions.

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index be85fa15be8d3888bf27b28f0c2faaf788eccb12..e89545e98293a95b8a3152a0bdb16a726eff98df 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -6885,6 +6885,8 @@ struct AheadOfTimeWriteBarrierStubList kAheadOfTime[] = {
   // ElementsTransitionGenerator::GenerateDoubleToObject
   { r6, r2, r0, EMIT_REMEMBERED_SET },
   { r2, r6, r9, EMIT_REMEMBERED_SET },
+  // StoreArrayLiteralElementStub::Generate
+  { r5, r0, r6, EMIT_REMEMBERED_SET },
   // Null termination.
   { no_reg, no_reg, no_reg, EMIT_REMEMBERED_SET}
 };
@@ -7121,6 +7123,64 @@ void RecordWriteStub::CheckNeedsToInformIncrementalMarker(
   // Fall through when we need to inform the incremental marker.
 }
 
+
+void StoreArrayLiteralElementStub::Generate(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- r0    : element value to store
+  //  -- r1    : array literal
+  //  -- r2    : map of array literal
+  //  -- r3    : element index as smi
+  //  -- r4    : array literal index in function as smi
+  // -----------------------------------
+
+  Label element_done;
+  Label double_elements;
+  Label smi_element;
+  Label slow_elements;
+  Label fast_elements;
+
+  __ CheckFastElements(r2, r5, &double_elements);
+  // FAST_SMI_ONLY_ELEMENTS or FAST_ELEMENTS
+  __ JumpIfSmi(r0, &smi_element);
+  __ CheckFastSmiOnlyElements(r2, r5, &fast_elements);
+
+  // Store into the array literal requires a elements transition. Call into
+  // the runtime.
+  __ bind(&slow_elements);
+  // call.
+  __ Push(r1, r3, r0);
+  __ ldr(r5, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+  __ ldr(r5, FieldMemOperand(r5, JSFunction::kLiteralsOffset));
+  __ Push(r5, r4);
+  __ TailCallRuntime(Runtime::kStoreArrayLiteralElement, 5, 1);
+
+  // Array literal has ElementsKind of FAST_ELEMENTS and value is an object.
+  __ bind(&fast_elements);
+  __ ldr(r5, FieldMemOperand(r1, JSObject::kElementsOffset));
+  __ add(r6, r5, Operand(r3, LSL, kPointerSizeLog2 - kSmiTagSize));
+  __ add(r6, r6, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ str(r0, MemOperand(r6, 0));
+  // Update the write barrier for the array store.
+  __ RecordWrite(r5, r6, r0, kLRHasNotBeenSaved, kDontSaveFPRegs,
+                 EMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
+  __ Ret();
+
+  // Array literal has ElementsKind of FAST_SMI_ONLY_ELEMENTS or
+  // FAST_ELEMENTS, and value is Smi.
+  __ bind(&smi_element);
+  __ ldr(r5, FieldMemOperand(r1, JSObject::kElementsOffset));
+  __ add(r6, r5, Operand(r3, LSL, kPointerSizeLog2 - kSmiTagSize));
+  __ str(r0, FieldMemOperand(r6, FixedArray::kHeaderSize));
+  __ Ret();
+
+  // Array literal has ElementsKind of FAST_DOUBLE_ELEMENTS.
+  __ bind(&double_elements);
+  __ ldr(r5, FieldMemOperand(r1, JSObject::kElementsOffset));
+  __ StoreNumberToDoubleElements(r0, r3, r1, r5, r6, r7, r9, r10,
+                                 &slow_elements);
+  __ Ret();
+}
+
 #undef __
 
 } }  // namespace v8::internal