ARM: Implement code stub for object literal creation.

This just ports r10036 to the ARM codegenerator. Please see the original
revision for a detailed description.

R=erik.corry@gmail.com

Review URL: http://codereview.chromium.org/8638012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10056 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/code-stubs-arm.cc

@@ -278,8 +278,7 @@ void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
   __ 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) {
@@ -299,8 +298,7 @@ void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
     __ 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);
   }
@@ -343,6 +341,49 @@ void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
 }
 
 
+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

src/arm/full-codegen-arm.cc

@@ -1416,10 +1416,11 @@ void FullCodeGenerator::VisitRegExpLiteral(RegExpLiteral* expr) {
 
 void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
   Comment cmnt(masm_, "[ ObjectLiteral");
+  Handle<FixedArray> constant_properties = expr->constant_properties();
   __ ldr(r3, MemOperand(fp,  JavaScriptFrameConstants::kFunctionOffset));
   __ ldr(r3, FieldMemOperand(r3, JSFunction::kLiteralsOffset));
   __ mov(r2, Operand(Smi::FromInt(expr->literal_index())));
-  __ mov(r1, Operand(expr->constant_properties()));
+  __ mov(r1, Operand(constant_properties));
   int flags = expr->fast_elements()
       ? ObjectLiteral::kFastElements
       : ObjectLiteral::kNoFlags;
@@ -1428,10 +1429,15 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
       : ObjectLiteral::kNoFlags;
   __ mov(r0, Operand(Smi::FromInt(flags)));
   __ Push(r3, r2, r1, r0);
+  int properties_count = constant_properties->length() / 2;
   if (expr->depth() > 1) {
     __ CallRuntime(Runtime::kCreateObjectLiteral, 4);
-  } else {
+  } else if (flags != ObjectLiteral::kFastElements ||
+      properties_count > FastCloneShallowObjectStub::kMaximumClonedProperties) {
     __ CallRuntime(Runtime::kCreateObjectLiteralShallow, 4);
+  } else {
+    FastCloneShallowObjectStub stub(properties_count);
+    __ CallStub(&stub);
   }
 
   // If result_saved is true the result is on top of the stack.  If

src/arm/lithium-codegen-arm.cc

@@ -4327,18 +4327,29 @@ void LCodeGen::DoArrayLiteral(LArrayLiteral* instr) {
 
 
 void LCodeGen::DoObjectLiteral(LObjectLiteral* instr) {
+  Handle<FixedArray> constant_properties =
+      instr->hydrogen()->constant_properties();
+
   __ ldr(r4, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
   __ ldr(r4, FieldMemOperand(r4, JSFunction::kLiteralsOffset));
   __ mov(r3, Operand(Smi::FromInt(instr->hydrogen()->literal_index())));
-  __ mov(r2, Operand(instr->hydrogen()->constant_properties()));
-  __ mov(r1, Operand(Smi::FromInt(instr->hydrogen()->fast_elements() ? 1 : 0)));
+  __ mov(r2, Operand(constant_properties));
+  int flags = instr->hydrogen()->fast_elements()
+      ? ObjectLiteral::kFastElements
+      : ObjectLiteral::kNoFlags;
+  __ mov(r1, Operand(Smi::FromInt(flags)));
   __ Push(r4, r3, r2, r1);
 
   // Pick the right runtime function to call.
+  int properties_count = constant_properties->length() / 2;
   if (instr->hydrogen()->depth() > 1) {
     CallRuntime(Runtime::kCreateObjectLiteral, 4, instr);
-  } else {
+  } else if (flags != ObjectLiteral::kFastElements ||
+      properties_count > FastCloneShallowObjectStub::kMaximumClonedProperties) {
     CallRuntime(Runtime::kCreateObjectLiteralShallow, 4, instr);
+  } else {
+    FastCloneShallowObjectStub stub(properties_count);
+    CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
   }
 }