[turbofan] Lower %_DebugIsActive intrinsic.

src/compiler/js-intrinsic-lowering.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/js-intrinsic-lowering.h"
 
 #include <stack>
 
 #include "src/code-factory.h"
 #include "src/compiler/access-builder.h"
@@ skipping 14 matching lines @@
     : AdvancedReducer(editor), jsgraph_(jsgraph), mode_(mode) {}
 
 Reduction JSIntrinsicLowering::Reduce(Node* node) {
   if (node->opcode() != IrOpcode::kJSCallRuntime) return NoChange();
   const Runtime::Function* const f =
       Runtime::FunctionForId(CallRuntimeParametersOf(node->op()).id());
   if (f->intrinsic_type != Runtime::IntrinsicType::INLINE) return NoChange();
   switch (f->function_id) {
     case Runtime::kInlineCreateIterResultObject:
       return ReduceCreateIterResultObject(node);
+    case Runtime::kInlineDebugIsActive:
+      return ReduceDebugIsActive(node);
     case Runtime::kInlineDeoptimizeNow:
       return ReduceDeoptimizeNow(node);
     case Runtime::kInlineGeneratorClose:
       return ReduceGeneratorClose(node);
     case Runtime::kInlineGeneratorGetInputOrDebugPos:
       return ReduceGeneratorGetInputOrDebugPos(node);
     case Runtime::kInlineGeneratorGetResumeMode:
       return ReduceGeneratorGetResumeMode(node);
     case Runtime::kInlineIsArray:
       return ReduceIsInstanceType(node, JS_ARRAY_TYPE);
@@ skipping 38 matching lines @@
 
 Reduction JSIntrinsicLowering::ReduceCreateIterResultObject(Node* node) {
   Node* const value = NodeProperties::GetValueInput(node, 0);
   Node* const done = NodeProperties::GetValueInput(node, 1);
   Node* const context = NodeProperties::GetContextInput(node);
   Node* const effect = NodeProperties::GetEffectInput(node);
   return Change(node, javascript()->CreateIterResultObject(), value, done,
                 context, effect);
 }
 
+Reduction JSIntrinsicLowering::ReduceDebugIsActive(Node* node) {
+  Node* const value = jsgraph()->ExternalConstant(
+      ExternalReference::debug_is_active_address(isolate()));
+  Node* const effect = NodeProperties::GetEffectInput(node);
+  Node* const control = NodeProperties::GetControlInput(node);
+  Operator const* const op =
+      simplified()->LoadField(AccessBuilder::ForExternalUint8Value());
+  return Change(node, op, value, effect, control);
+}
 
 Reduction JSIntrinsicLowering::ReduceDeoptimizeNow(Node* node) {
   if (mode() != kDeoptimizationEnabled) return NoChange();
   Node* const frame_state = NodeProperties::GetFrameStateInput(node);
   Node* const effect = NodeProperties::GetEffectInput(node);
   Node* const control = NodeProperties::GetControlInput(node);
 
   // TODO(bmeurer): Move MergeControlToEnd() to the AdvancedReducer.
   Node* deoptimize = graph()->NewNode(
       common()->Deoptimize(DeoptimizeKind::kEager, DeoptimizeReason::kNoReason),
@@ skipping 251 matching lines @@
   return jsgraph_->javascript();
 }
 
 SimplifiedOperatorBuilder* JSIntrinsicLowering::simplified() const {
   return jsgraph()->simplified();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8