MIPS: Implement code stub for object literal creation.

Port r10056 (ffa6eedd8).

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

BUG=
TEST=

Review URL: http://codereview.chromium.org/8747011
Patch from Daniel Kalmar <kalmard@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10124 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/code-stubs-mips.cc

@@ -343,6 +343,51 @@ 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 a3 and check if we need to create a
+  // boilerplate.
+  Label slow_case;
+  __ lw(a3, MemOperand(sp, 3 * kPointerSize));
+  __ lw(a0, MemOperand(sp, 2 * kPointerSize));
+  __ Addu(a3, a3, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ sll(t0, a0, kPointerSizeLog2 - kSmiTagSize);
+  __ Addu(a3, t0, a3);
+  __ lw(a3, MemOperand(a3));
+  __ LoadRoot(t0, Heap::kUndefinedValueRootIndex);
+  __ Branch(&slow_case, eq, a3, Operand(t0));
+
+  // Check that the boilerplate contains only fast properties and we can
+  // statically determine the instance size.
+  int size = JSObject::kHeaderSize + length_ * kPointerSize;
+  __ lw(a0, FieldMemOperand(a3, HeapObject::kMapOffset));
+  __ lbu(a0, FieldMemOperand(a0, Map::kInstanceSizeOffset));
+  __ Branch(&slow_case, ne, a0, Operand(size >> kPointerSizeLog2));
+
+  // Allocate the JS object and copy header together with all in-object
+  // properties from the boilerplate.
+  __ AllocateInNewSpace(size, a0, a1, a2, &slow_case, TAG_OBJECT);
+  for (int i = 0; i < size; i += kPointerSize) {
+    __ lw(a1, FieldMemOperand(a3, i));
+    __ sw(a1, FieldMemOperand(a0, i));
+  }
+
+  // Return and remove the on-stack parameters.
+  __ Drop(4);
+  __ Ret(USE_DELAY_SLOT);
+  __ mov(v0, a0);
+
+  __ 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/mips/full-codegen-mips.cc

@@ -1424,10 +1424,11 @@ void FullCodeGenerator::VisitRegExpLiteral(RegExpLiteral* expr) {
 
 void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
   Comment cmnt(masm_, "[ ObjectLiteral");
+  Handle<FixedArray> constant_properties = expr->constant_properties();
   __ lw(a3, MemOperand(fp,  JavaScriptFrameConstants::kFunctionOffset));
   __ lw(a3, FieldMemOperand(a3, JSFunction::kLiteralsOffset));
   __ li(a2, Operand(Smi::FromInt(expr->literal_index())));
-  __ li(a1, Operand(expr->constant_properties()));
+  __ li(a1, Operand(constant_properties));
   int flags = expr->fast_elements()
       ? ObjectLiteral::kFastElements
       : ObjectLiteral::kNoFlags;
@@ -1436,10 +1437,15 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
       : ObjectLiteral::kNoFlags;
   __ li(a0, Operand(Smi::FromInt(flags)));
   __ Push(a3, a2, a1, a0);
+  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/mips/lithium-codegen-mips.cc

@@ -4176,18 +4176,30 @@ void LCodeGen::DoArrayLiteral(LArrayLiteral* instr) {
 
 void LCodeGen::DoObjectLiteral(LObjectLiteral* instr) {
   ASSERT(ToRegister(instr->result()).is(v0));
+
+  Handle<FixedArray> constant_properties =
+      instr->hydrogen()->constant_properties();
+
   __ lw(t0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
   __ lw(t0, FieldMemOperand(t0, JSFunction::kLiteralsOffset));
   __ li(a3, Operand(Smi::FromInt(instr->hydrogen()->literal_index())));
-  __ li(a2, Operand(instr->hydrogen()->constant_properties()));
-  __ li(a1, Operand(Smi::FromInt(instr->hydrogen()->fast_elements() ? 1 : 0)));
+  __ li(a2, Operand(constant_properties));
+  int flags = instr->hydrogen()->fast_elements()
+      ? ObjectLiteral::kFastElements
+      : ObjectLiteral::kNoFlags;
+  __ li(a1, Operand(Smi::FromInt(flags)));
   __ Push(t0, a3, a2, a1);
 
   // 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);
   }
 }