Create a new RegExp object for every evaluation of a RegExp literal.

src/ia32/codegen-ia32.cc

 // Copyright 2010 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 120 matching lines @@
       previous_(owner->state()) {
   owner_->set_state(this);
 }
 
 
 CodeGenState::~CodeGenState() {
   ASSERT(owner_->state() == this);
   owner_->set_state(previous_);
 }
 
-
 // -------------------------------------------------------------------------
 // CodeGenerator implementation.
 
 CodeGenerator::CodeGenerator(MacroAssembler* masm)
     : deferred_(8),
       masm_(masm),
       info_(NULL),
       frame_(NULL),
       allocator_(NULL),
       state_(NULL),
@@ skipping 5150 matching lines @@
   __ push(Immediate(Smi::FromInt(node_->literal_index())));
   // RegExp pattern (2).
   __ push(Immediate(node_->pattern()));
   // RegExp flags (3).
   __ push(Immediate(node_->flags()));
   __ CallRuntime(Runtime::kMaterializeRegExpLiteral, 4);
   if (!boilerplate_.is(eax)) __ mov(boilerplate_, eax);
 }
 
 
+class DeferredAllocateInNewSpace: public DeferredCode {
+ public:
+  DeferredAllocateInNewSpace(int size, Register target)
+    : size_(size), target_(target) {
+    ASSERT(size >= kPointerSize && size <= Heap::MaxObjectSizeInNewSpace());
+    set_comment("[ DeferredAllocateInNewSpace");
+  }
+  void Generate();
+
+ private:
+  int size_;
+  Register target_;
+};
+
+
+void DeferredAllocateInNewSpace::Generate() {
+  __ push(Immediate(Smi::FromInt(size_)));
+  __ CallRuntime(Runtime::kAllocateInNewSpace, 1);
+  if (!target_.is(eax)) {
+    __ mov(target_, eax);
+  }
+}
+
+
 void CodeGenerator::VisitRegExpLiteral(RegExpLiteral* node) {
   ASSERT(!in_safe_int32_mode());
   Comment cmnt(masm_, "[ RegExp Literal");
 
   // Retrieve the literals array and check the allocated entry.  Begin
   // with a writable copy of the function of this activation in a
   // register.
   frame_->PushFunction();
   Result literals = frame_->Pop();
   literals.ToRegister();
@@ skipping 10 matching lines @@
       FixedArray::kHeaderSize + node->literal_index() * kPointerSize;
   __ mov(boilerplate.reg(), FieldOperand(literals.reg(), literal_offset));
 
   // Check whether we need to materialize the RegExp object.  If so,
   // jump to the deferred code passing the literals array.
   DeferredRegExpLiteral* deferred =
       new DeferredRegExpLiteral(boilerplate.reg(), literals.reg(), node);
   __ cmp(boilerplate.reg(), Factory::undefined_value());
   deferred->Branch(equal);
   deferred->BindExit();
-  literals.Unuse();
 
-  // Push the boilerplate object.
+  // Register of boilerplate contains RegExp object.
+
+  Result tmp = allocator()->Allocate();
+  ASSERT(tmp.is_valid());
+
+  int size = JSRegExp::kSize + JSRegExp::kInObjectFieldCount * kPointerSize;
+
+  DeferredAllocateInNewSpace* allocate_fallback =
+      new DeferredAllocateInNewSpace(size, literals.reg());
   frame_->Push(&boilerplate);
+  frame_->SpillTop();
+  __ AllocateInNewSpace(size,
+                        literals.reg(),
+                        tmp.reg(),
+                        no_reg,
+                        allocate_fallback->entry_label(),
+                        TAG_OBJECT);
+  allocate_fallback->BindExit();
+  boilerplate = frame_->Pop();
+  // Copy from boilerplate to clone and return clone.
+
+  for (int i = 0; i < size; i += kPointerSize) {
+    __ mov(tmp.reg(), FieldOperand(boilerplate.reg(), i));
+    __ mov(FieldOperand(literals.reg(), i), tmp.reg());
+  }
+  frame_->Push(&literals);
 }
 
 
 void CodeGenerator::VisitObjectLiteral(ObjectLiteral* node) {
   ASSERT(!in_safe_int32_mode());
   Comment cmnt(masm_, "[ ObjectLiteral");
 
   // Load a writable copy of the function of this activation in a
   // register.
   frame_->PushFunction();
@@ skipping 2162 matching lines @@
     SetFrame(clone, &empty_regs);
     __ bind(&runtime);
     result = frame()->CallRuntime(Runtime::kMath_sqrt, 1);
 
     end.Bind(&result);
     frame()->Push(&result);
   }
 }
 
 
+void CodeGenerator::GenerateIsRegExpEquivalent(ZoneList<Expression*>* args) {
+  ASSERT_EQ(2, args->length());
+  Load(args->at(0));
+  Load(args->at(1));
+  Result right_res = frame_->Pop();
+  Result left_res = frame_->Pop();
+  right_res.ToRegister();
+  left_res.ToRegister();
+  Result tmp_res = allocator()->Allocate();
+  ASSERT(tmp_res.is_valid());
+  Register right = right_res.reg();
+  Register left = left_res.reg();
+  Register tmp = tmp_res.reg();
+  right_res.Unuse();
+  left_res.Unuse();
+  tmp_res.Unuse();
+  __ cmp(left, Operand(right));
+  destination()->true_target()->Branch(equal);
+  // Fail if either is a non-HeapObject.
+  __ mov(tmp, left);
+  __ and_(Operand(tmp), right);
+  __ test(Operand(tmp), Immediate(kSmiTagMask));
+  destination()->false_target()->Branch(equal);
+  __ mov(tmp, FieldOperand(left, HeapObject::kMapOffset));
+  __ cmpb(FieldOperand(tmp, Map::kInstanceTypeOffset),
+          static_cast<int8_t>(JS_REGEXP_TYPE));
+  destination()->false_target()->Branch(not_equal);
+  __ cmp(tmp, FieldOperand(right, HeapObject::kMapOffset));
+  destination()->false_target()->Branch(not_equal);
+  __ mov(tmp, FieldOperand(left, JSRegExp::kDataOffset));
+  __ cmp(tmp, FieldOperand(right, JSRegExp::kDataOffset));
+  destination()->Split(equal);
+}
+
+
 void CodeGenerator::VisitCallRuntime(CallRuntime* node) {
   ASSERT(!in_safe_int32_mode());
   if (CheckForInlineRuntimeCall(node)) {
     return;
   }
 
   ZoneList<Expression*>* args = node->arguments();
   Comment cmnt(masm_, "[ CallRuntime");
   Runtime::Function* function = node->function();
 
@@ skipping 6421 matching lines @@
   masm.GetCode(&desc);
   // Call the function from C++.
   return FUNCTION_CAST<MemCopyFunction>(buffer);
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32