Implement tracking and optimizations of packed arrays

src/x64/full-codegen-x64.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 1641 matching lines @@
 
 void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
   Comment cmnt(masm_, "[ ArrayLiteral");
 
   ZoneList<Expression*>* subexprs = expr->values();
   int length = subexprs->length();
   Handle<FixedArray> constant_elements = expr->constant_elements();
   ASSERT_EQ(2, constant_elements->length());
   ElementsKind constant_elements_kind =
       static_cast<ElementsKind>(Smi::cast(constant_elements->get(0))->value());
-  bool has_constant_fast_elements = constant_elements_kind == FAST_ELEMENTS;
+  bool has_constant_fast_elements =
+      IsFastObjectElementsKind(constant_elements_kind);
   Handle<FixedArrayBase> constant_elements_values(
       FixedArrayBase::cast(constant_elements->get(1)));
 
   __ movq(rbx, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
   __ push(FieldOperand(rbx, JSFunction::kLiteralsOffset));
   __ Push(Smi::FromInt(expr->literal_index()));
   __ Push(constant_elements);
   Heap* heap = isolate()->heap();
   if (has_constant_fast_elements &&
       constant_elements_values->map() == heap->fixed_cow_array_map()) {
-    // If the elements are already FAST_ELEMENTS, the boilerplate cannot
+    // If the elements are already FAST_*_ELEMENTS, the boilerplate cannot
     // change, so it's possible to specialize the stub in advance.
     __ IncrementCounter(isolate()->counters()->cow_arrays_created_stub(), 1);
     FastCloneShallowArrayStub stub(
         FastCloneShallowArrayStub::COPY_ON_WRITE_ELEMENTS,
         length);
     __ CallStub(&stub);
   } else if (expr->depth() > 1) {
     __ CallRuntime(Runtime::kCreateArrayLiteral, 3);
   } else if (length > FastCloneShallowArrayStub::kMaximumClonedLength) {
     __ CallRuntime(Runtime::kCreateArrayLiteralShallow, 3);
   } else {
-    ASSERT(constant_elements_kind == FAST_ELEMENTS ||
-           constant_elements_kind == FAST_SMI_ONLY_ELEMENTS ||
+    ASSERT(IsFastSmiOrObjectElementsKind(constant_elements_kind) ||
            FLAG_smi_only_arrays);
-    // If the elements are already FAST_ELEMENTS, the boilerplate cannot
+    // If the elements are already FAST_*_ELEMENTS, the boilerplate cannot
     // change, so it's possible to specialize the stub in advance.
     FastCloneShallowArrayStub::Mode mode = has_constant_fast_elements
         ? FastCloneShallowArrayStub::CLONE_ELEMENTS
         : FastCloneShallowArrayStub::CLONE_ANY_ELEMENTS;
     FastCloneShallowArrayStub stub(mode, length);
     __ CallStub(&stub);
   }
 
   bool result_saved = false;  // Is the result saved to the stack?
 
   // Emit code to evaluate all the non-constant subexpressions and to store
   // them into the newly cloned array.
   for (int i = 0; i < length; i++) {
     Expression* subexpr = subexprs->at(i);
     // If the subexpression is a literal or a simple materialized literal it
     // is already set in the cloned array.
     if (subexpr->AsLiteral() != NULL ||
         CompileTimeValue::IsCompileTimeValue(subexpr)) {
       continue;
     }
 
     if (!result_saved) {
       __ push(rax);
       result_saved = true;
     }
     VisitForAccumulatorValue(subexpr);
 
-    if (constant_elements_kind == FAST_ELEMENTS) {
-      // Fast-case array literal with ElementsKind of FAST_ELEMENTS, they cannot
-      // transition and don't need to call the runtime stub.
+    if (IsFastObjectElementsKind(constant_elements_kind)) {
+      // Fast-case array literal with ElementsKind of FAST_*_ELEMENTS, they
+      // cannot transition and don't need to call the runtime stub.
       int offset = FixedArray::kHeaderSize + (i * kPointerSize);
       __ movq(rbx, Operand(rsp, 0));  // Copy of array literal.
       __ movq(rbx, FieldOperand(rbx, JSObject::kElementsOffset));
       // Store the subexpression value in the array's elements.
       __ movq(FieldOperand(rbx, offset), result_register());
       // Update the write barrier for the array store.
       __ RecordWriteField(rbx, offset, result_register(), rcx,
                           kDontSaveFPRegs,
                           EMIT_REMEMBERED_SET,
                           INLINE_SMI_CHECK);
@@ skipping 2870 matching lines @@
   *context_length = 0;
   return previous_;
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64