ARM: Implement code stub for object literal creation.

src/arm/code-stubs-arm.cc

 // Copyright 2011 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 260 matching lines @@
   }
   int size = JSArray::kSize + elements_size;
 
   // Load boilerplate object into r3 and check if we need to create a
   // boilerplate.
   Label slow_case;
   __ ldr(r3, MemOperand(sp, 2 * kPointerSize));
   __ ldr(r0, MemOperand(sp, 1 * kPointerSize));
   __ add(r3, r3, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
   __ ldr(r3, MemOperand(r3, r0, LSL, kPointerSizeLog2 - kSmiTagSize));
-  __ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
-  __ cmp(r3, ip);
+  __ CompareRoot(r3, Heap::kUndefinedValueRootIndex);
   __ b(eq, &slow_case);
 
   if (FLAG_debug_code) {
     const char* message;
     Heap::RootListIndex expected_map_index;
     if (mode_ == CLONE_ELEMENTS) {
       message = "Expected (writable) fixed array";
       expected_map_index = Heap::kFixedArrayMapRootIndex;
     } else if (mode_ == CLONE_DOUBLE_ELEMENTS) {
       message = "Expected (writable) fixed double array";
       expected_map_index = Heap::kFixedDoubleArrayMapRootIndex;
     } else {
       ASSERT(mode_ == COPY_ON_WRITE_ELEMENTS);
       message = "Expected copy-on-write fixed array";
       expected_map_index = Heap::kFixedCOWArrayMapRootIndex;
     }
     __ push(r3);
     __ ldr(r3, FieldMemOperand(r3, JSArray::kElementsOffset));
     __ ldr(r3, FieldMemOperand(r3, HeapObject::kMapOffset));
-    __ LoadRoot(ip, expected_map_index);
-    __ cmp(r3, ip);
+    __ CompareRoot(r3, expected_map_index);
     __ Assert(eq, message);
     __ pop(r3);
   }
 
   // Allocate both the JS array and the elements array in one big
   // allocation. This avoids multiple limit checks.
   __ AllocateInNewSpace(size,
                         r0,
                         r1,
                         r2,
@@ skipping 22 matching lines @@
 
   // Return and remove the on-stack parameters.
   __ add(sp, sp, Operand(3 * kPointerSize));
   __ Ret();
 
   __ bind(&slow_case);
   __ TailCallRuntime(Runtime::kCreateArrayLiteralShallow, 3, 1);
 }
 
 
+void FastCloneShallowObjectStub::Generate(MacroAssembler* masm) {
+  // Stack layout on entry:
+  //
+  // [sp]: object literal flags.
+  // [sp + kPointerSize]: constant properties.
+  // [sp + (2 * kPointerSize)]: literal index.
+  // [sp + (3 * kPointerSize)]: literals array.
+
+  // Load boilerplate object into r3 and check if we need to create a
+  // boilerplate.
+  Label slow_case;
+  __ ldr(r3, MemOperand(sp, 3 * kPointerSize));
+  __ ldr(r0, MemOperand(sp, 2 * kPointerSize));
+  __ add(r3, r3, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ ldr(r3, MemOperand(r3, r0, LSL, kPointerSizeLog2 - kSmiTagSize));
+  __ CompareRoot(r3, Heap::kUndefinedValueRootIndex);
+  __ b(eq, &slow_case);
+
+  // Check that the boilerplate contains only fast properties and we can
+  // statically determine the instance size.
+  int size = JSObject::kHeaderSize + length_ * kPointerSize;
+  __ ldr(r0, FieldMemOperand(r3, HeapObject::kMapOffset));
+  __ ldrb(r0, FieldMemOperand(r0, Map::kInstanceSizeOffset));
+  __ cmp(r0, Operand(size >> kPointerSizeLog2));
+  __ b(ne, &slow_case);
+
+  // Allocate the JS object and copy header together with all in-object
+  // properties from the boilerplate.
+  __ AllocateInNewSpace(size, r0, r1, r2, &slow_case, TAG_OBJECT);
+  for (int i = 0; i < size; i += kPointerSize) {
+    __ ldr(r1, FieldMemOperand(r3, i));
+    __ str(r1, FieldMemOperand(r0, i));
+  }
+
+  // Return and remove the on-stack parameters.
+  __ add(sp, sp, Operand(4 * kPointerSize));
+  __ Ret();
+
+  __ bind(&slow_case);
+  __ TailCallRuntime(Runtime::kCreateObjectLiteralShallow, 4, 1);
+}
+
+
 // Takes a Smi and converts to an IEEE 64 bit floating point value in two
 // registers.  The format is 1 sign bit, 11 exponent bits (biased 1023) and
 // 52 fraction bits (20 in the first word, 32 in the second).  Zeros is a
 // scratch register.  Destroys the source register.  No GC occurs during this
 // stub so you don't have to set up the frame.
 class ConvertToDoubleStub : public CodeStub {
  public:
   ConvertToDoubleStub(Register result_reg_1,
                       Register result_reg_2,
                       Register source_reg,
@@ skipping 6823 matching lines @@
   __ StoreNumberToDoubleElements(r0, r3, r1, r5, r6, r7, r9, r10,
                                  &slow_elements);
   __ Ret();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM