[runtime] First step to sanitize regexp literal creation.

src/full-codegen/arm/full-codegen-arm.cc

Index: src/full-codegen/arm/full-codegen-arm.cc
diff --git a/src/full-codegen/arm/full-codegen-arm.cc b/src/full-codegen/arm/full-codegen-arm.cc
index 0b56202d032fb7bee2cb5bf065f20deaee68a71e..637eb2bcdabdba81a93fc3ab136b07a2b10586bf 100644
--- a/src/full-codegen/arm/full-codegen-arm.cc
+++ b/src/full-codegen/arm/full-codegen-arm.cc
@@ -1461,49 +1461,12 @@ void FullCodeGenerator::EmitVariableLoad(VariableProxy* proxy,
 
 void FullCodeGenerator::VisitRegExpLiteral(RegExpLiteral* expr) {
   Comment cmnt(masm_, "[ RegExpLiteral");
-  Label materialized;
-  // Registers will be used as follows:
-  // r5 = materialized value (RegExp literal)
-  // r4 = JS function, literals array
-  // r3 = literal index
-  // r2 = RegExp pattern
-  // r1 = RegExp flags
-  // r0 = RegExp literal clone
-  __ ldr(r0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
-  __ ldr(r4, FieldMemOperand(r0, JSFunction::kLiteralsOffset));
-  int literal_offset = LiteralsArray::OffsetOfLiteralAt(expr->literal_index());
-  __ ldr(r5, FieldMemOperand(r4, literal_offset));
-  __ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
-  __ cmp(r5, ip);
-  __ b(ne, &materialized);
-
-  // Create regexp literal using runtime function.
-  // Result will be in r0.
-  __ mov(r3, Operand(Smi::FromInt(expr->literal_index())));
-  __ mov(r2, Operand(expr->pattern()));
-  __ mov(r1, Operand(expr->flags()));
-  __ Push(r4, r3, r2, r1);
-  __ CallRuntime(Runtime::kMaterializeRegExpLiteral, 4);
-  __ mov(r5, r0);
-
-  __ bind(&materialized);
-  int size = JSRegExp::kSize + JSRegExp::kInObjectFieldCount * kPointerSize;
-  Label allocated, runtime_allocate;
-  __ Allocate(size, r0, r2, r3, &runtime_allocate, TAG_OBJECT);
-  __ jmp(&allocated);
-
-  __ bind(&runtime_allocate);
-  __ mov(r0, Operand(Smi::FromInt(size)));
-  __ Push(r5, r0);
-  __ CallRuntime(Runtime::kAllocateInNewSpace, 1);
-  __ pop(r5);
-
-  __ bind(&allocated);
-  // After this, registers are used as follows:
-  // r0: Newly allocated regexp.
-  // r5: Materialized regexp.
-  // r2: temp.
-  __ CopyFields(r0, r5, d0, size / kPointerSize);
+  __ ldr(r3, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+  __ mov(r2, Operand(Smi::FromInt(expr->literal_index())));
+  __ mov(r1, Operand(expr->pattern()));
+  __ mov(r0, Operand(expr->flags()));
+  FastCloneRegExpStub stub(isolate());
+  __ CallStub(&stub);
   context()->Plug(r0);
 }