Implement tracking and optimizations of packed arrays

src/arm/code-stubs-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 7077 matching lines @@
   { REG(r4), REG(r1), REG(r2), OMIT_REMEMBERED_SET },
   // Used in StoreStubCompiler::CompileStoreField via GenerateStoreField.
   { REG(r1), REG(r2), REG(r3), EMIT_REMEMBERED_SET },
   { REG(r3), REG(r2), REG(r1), EMIT_REMEMBERED_SET },
   // Used in KeyedStoreStubCompiler::CompileStoreField via GenerateStoreField.
   { REG(r2), REG(r1), REG(r3), EMIT_REMEMBERED_SET },
   { REG(r3), REG(r1), REG(r2), EMIT_REMEMBERED_SET },
   // KeyedStoreStubCompiler::GenerateStoreFastElement.
   { REG(r3), REG(r2), REG(r4), EMIT_REMEMBERED_SET },
   { REG(r2), REG(r3), REG(r4), EMIT_REMEMBERED_SET },
-  // ElementsTransitionGenerator::GenerateSmiOnlyToObject
+  // ElementsTransitionGenerator::GenerateMapChangeElementTransition
   // and ElementsTransitionGenerator::GenerateSmiOnlyToDouble
   // and ElementsTransitionGenerator::GenerateDoubleToObject
   { REG(r2), REG(r3), REG(r9), EMIT_REMEMBERED_SET },
   { REG(r2), REG(r3), REG(r9), OMIT_REMEMBERED_SET },
   // ElementsTransitionGenerator::GenerateDoubleToObject
   { REG(r6), REG(r2), REG(r0), EMIT_REMEMBERED_SET },
   { REG(r2), REG(r6), REG(r9), EMIT_REMEMBERED_SET },
   // StoreArrayLiteralElementStub::Generate
   { REG(r5), REG(r0), REG(r6), EMIT_REMEMBERED_SET },
   // Null termination.
@@ skipping 243 matching lines @@
   //  -- 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
+  // 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.
+  // 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.
+  // 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, r2,
                                  &slow_elements);
   __ Ret();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM