[intrinsics] Remove unused %_RegExpExec and %_NumberToString.

These intrinsics are no longer required, but their runtime call pendants
are still in use. So remove support for those from all compilers.

BUG=v8:5049
R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2694623002
Cr-Commit-Position: refs/heads/master@{#43131}

src/compiler/js-intrinsic-lowering.cc

@@ -58,8 +58,6 @@ Reduction JSIntrinsicLowering::Reduce(Node* node) {
       return ReduceFixedArrayGet(node);
     case Runtime::kInlineFixedArraySet:
       return ReduceFixedArraySet(node);
-    case Runtime::kInlineRegExpExec:
-      return ReduceRegExpExec(node);
     case Runtime::kInlineSubString:
       return ReduceSubString(node);
     case Runtime::kInlineToInteger:
@@ -270,11 +268,6 @@ Reduction JSIntrinsicLowering::ReduceFixedArraySet(Node* node) {
 }
 
 
-Reduction JSIntrinsicLowering::ReduceRegExpExec(Node* node) {
-  return Change(node, CodeFactory::RegExpExec(isolate()), 4);
-}
-
-
 Reduction JSIntrinsicLowering::ReduceSubString(Node* node) {
   return Change(node, CodeFactory::SubString(isolate()), 3);
 }

src/compiler/js-intrinsic-lowering.h

@@ -52,7 +52,6 @@ class V8_EXPORT_PRIVATE JSIntrinsicLowering final
   Reduction ReduceIsSmi(Node* node);
   Reduction ReduceFixedArrayGet(Node* node);
   Reduction ReduceFixedArraySet(Node* node);
-  Reduction ReduceRegExpExec(Node* node);
   Reduction ReduceSubString(Node* node);
   Reduction ReduceToInteger(Node* node);
   Reduction ReduceToLength(Node* node);

src/crankshaft/hydrogen.cc

@@ -12128,32 +12128,6 @@ void HOptimizedGraphBuilder::GenerateSubString(CallRuntime* call) {
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
-// Support for direct calls from JavaScript to native RegExp code.
-void HOptimizedGraphBuilder::GenerateRegExpExec(CallRuntime* call) {
-  DCHECK_EQ(4, call->arguments()->length());
-  CHECK_ALIVE(VisitExpressions(call->arguments()));
-  Callable callable = CodeFactory::RegExpExec(isolate());
-  HValue* last_match_info = Pop();
-  HValue* index = Pop();
-  HValue* subject = Pop();
-  HValue* regexp_object = Pop();
-  HValue* stub = Add<HConstant>(callable.code());
-  HValue* values[] = {regexp_object, subject, index, last_match_info};
-  HInstruction* result = New<HCallWithDescriptor>(
-      stub, 0, callable.descriptor(), ArrayVector(values));
-  return ast_context()->ReturnInstruction(result, call->id());
-}
-
-
-// Fast support for number to string.
-void HOptimizedGraphBuilder::GenerateNumberToString(CallRuntime* call) {
-  DCHECK_EQ(1, call->arguments()->length());
-  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
-  HValue* number = Pop();
-  HValue* result = BuildNumberToString(number, AstType::Any());
-  return ast_context()->ReturnValue(result);
-}
-
 
 // Fast support for calls.
 void HOptimizedGraphBuilder::GenerateCall(CallRuntime* call) {

src/crankshaft/hydrogen.h

@@ -2166,8 +2166,6 @@ class HOptimizedGraphBuilder : public HGraphBuilder,
   F(DebugBreakInOptimizedCode)         \
   F(StringCharCodeAt)                  \
   F(SubString)                         \
-  F(RegExpExec)                        \
-  F(NumberToString)                    \
   F(DebugIsActive)                     \
   /* Typed Arrays */                   \
   F(TypedArrayInitialize)              \

src/debug/mirrors.js

@@ -537,7 +537,7 @@ inherits(NumberMirror, ValueMirror);
 
 
 NumberMirror.prototype.toText = function() {
-  return %_NumberToString(this.value_);
+  return %NumberToString(this.value_);
 };
 
 

src/full-codegen/full-codegen.cc

@@ -561,21 +561,6 @@ void FullCodeGenerator::EmitSubString(CallRuntime* expr) {
 }
 
 
-void FullCodeGenerator::EmitRegExpExec(CallRuntime* expr) {
-  // Load the arguments on the stack and call the stub.
-  RegExpExecStub stub(isolate());
-  ZoneList<Expression*>* args = expr->arguments();
-  DCHECK(args->length() == 4);
-  VisitForStackValue(args->at(0));
-  VisitForStackValue(args->at(1));
-  VisitForStackValue(args->at(2));
-  VisitForStackValue(args->at(3));
-  __ CallStub(&stub);
-  OperandStackDepthDecrement(4);
-  context()->Plug(result_register());
-}
-
-
 void FullCodeGenerator::EmitIntrinsicAsStubCall(CallRuntime* expr,
                                                 const Callable& callable) {
   ZoneList<Expression*>* args = expr->arguments();
@@ -607,10 +592,6 @@ void FullCodeGenerator::EmitIntrinsicAsStubCall(CallRuntime* expr,
   context()->Plug(result_register());
 }
 
-void FullCodeGenerator::EmitNumberToString(CallRuntime* expr) {
-  EmitIntrinsicAsStubCall(expr, CodeFactory::NumberToString(isolate()));
-}
-
 
 void FullCodeGenerator::EmitToString(CallRuntime* expr) {
   EmitIntrinsicAsStubCall(expr, CodeFactory::ToString(isolate()));

src/full-codegen/full-codegen.h

@@ -412,9 +412,7 @@ class FullCodeGenerator final : public AstVisitor<FullCodeGenerator> {
   F(ClassOf)                            \
   F(StringCharCodeAt)                   \
   F(SubString)                          \
-  F(RegExpExec)                         \
   F(ToInteger)                          \
-  F(NumberToString)                     \
   F(ToString)                           \
   F(ToLength)                           \
   F(ToNumber)                           \

src/interpreter/interpreter-intrinsics.cc

@@ -242,18 +242,6 @@ Node* IntrinsicsHelper::HasProperty(Node* input, Node* arg_count,
                              CodeFactory::HasProperty(isolate()));
 }
 
-Node* IntrinsicsHelper::NumberToString(Node* input, Node* arg_count,
-                                       Node* context) {
-  return IntrinsicAsStubCall(input, context,
-                             CodeFactory::NumberToString(isolate()));
-}
-
-Node* IntrinsicsHelper::RegExpExec(Node* input, Node* arg_count,
-                                   Node* context) {
-  return IntrinsicAsStubCall(input, context,
-                             CodeFactory::RegExpExec(isolate()));
-}
-
 Node* IntrinsicsHelper::SubString(Node* input, Node* arg_count, Node* context) {
   return IntrinsicAsStubCall(input, context, CodeFactory::SubString(isolate()));
 }

src/interpreter/interpreter-intrinsics.h

@@ -33,8 +33,6 @@ namespace interpreter {
   V(IsJSReceiver, is_js_receiver, 1)                      \
   V(IsSmi, is_smi, 1)                                     \
   V(IsTypedArray, is_typed_array, 1)                      \
-  V(NumberToString, number_to_string, 1)                  \
-  V(RegExpExec, reg_exp_exec, 4)                          \
   V(SubString, sub_string, 3)                             \
   V(ToString, to_string, 1)                               \
   V(ToLength, to_length, 1)                               \