[runtime] Introduce dedicated JSBoundFunction to represent bound functions.

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 38 matching lines @@
       return ReduceDoubleLo(node);
     case Runtime::kInlineIncrementStatsCounter:
       return ReduceIncrementStatsCounter(node);
     case Runtime::kInlineIsArray:
       return ReduceIsInstanceType(node, JS_ARRAY_TYPE);
     case Runtime::kInlineIsDate:
       return ReduceIsInstanceType(node, JS_DATE_TYPE);
     case Runtime::kInlineIsTypedArray:
       return ReduceIsInstanceType(node, JS_TYPED_ARRAY_TYPE);
     case Runtime::kInlineIsFunction:
-      return ReduceIsInstanceType(node, JS_FUNCTION_TYPE);
+      return ReduceIsFunction(node);
     case Runtime::kInlineIsRegExp:
       return ReduceIsInstanceType(node, JS_REGEXP_TYPE);
     case Runtime::kInlineIsJSReceiver:
       return ReduceIsJSReceiver(node);
     case Runtime::kInlineIsSmi:
       return ReduceIsSmi(node);
     case Runtime::kInlineJSValueGetValue:
       return ReduceJSValueGetValue(node);
     case Runtime::kInlineMathClz32:
       return ReduceMathClz32(node);
@@ skipping 174 matching lines @@
   // Replace all effect uses of {node} with the {ephi}.
   Node* ephi = graph()->NewNode(common()->EffectPhi(2), etrue, efalse, merge);
   ReplaceWithValue(node, node, ephi);
 
   // Turn the {node} into a Phi.
   return Change(node, common()->Phi(MachineRepresentation::kTagged, 2), vtrue,
                 vfalse, merge);
 }
 
 
+Reduction JSIntrinsicLowering::ReduceIsFunction(Node* node) {
+  Node* value = NodeProperties::GetValueInput(node, 0);
+  Type* value_type = NodeProperties::GetType(value);
+  Node* effect = NodeProperties::GetEffectInput(node);
+  Node* control = NodeProperties::GetControlInput(node);
+  if (value_type->Is(Type::Function())) {
+    value = jsgraph()->TrueConstant();
+  } else {
+    // if (%_IsSmi(value)) {
+    //   return false;
+    // } else {
+    //   return FIRST_FUNCTION_TYPE <= %_GetInstanceType(%_GetMap(value))
+    // }
+    STATIC_ASSERT(LAST_TYPE == LAST_FUNCTION_TYPE);
+
+    Node* check = graph()->NewNode(simplified()->ObjectIsSmi(), value);
+    Node* branch = graph()->NewNode(common()->Branch(), check, control);
+
+    Node* if_true = graph()->NewNode(common()->IfTrue(), branch);
+    Node* etrue = effect;
+    Node* vtrue = jsgraph()->FalseConstant();
+
+    Node* if_false = graph()->NewNode(common()->IfFalse(), branch);
+    Node* efalse = graph()->NewNode(
+        simplified()->LoadField(AccessBuilder::ForMapInstanceType()),
+        graph()->NewNode(simplified()->LoadField(AccessBuilder::ForMap()),
+                         value, effect, if_false),
+        effect, if_false);
+    Node* vfalse =
+        graph()->NewNode(machine()->Uint32LessThanOrEqual(),
+                         jsgraph()->Int32Constant(FIRST_FUNCTION_TYPE), efalse);
+
+    control = graph()->NewNode(common()->Merge(2), if_true, if_false);
+    effect = graph()->NewNode(common()->EffectPhi(2), etrue, efalse, control);
+    value = graph()->NewNode(common()->Phi(MachineRepresentation::kTagged, 2),
+                             vtrue, vfalse, control);
+  }
+  ReplaceWithValue(node, node, effect, control);
+  return Replace(value);
+}
+
+
 Reduction JSIntrinsicLowering::ReduceIsJSReceiver(Node* node) {
   Node* value = NodeProperties::GetValueInput(node, 0);
   Type* value_type = NodeProperties::GetType(value);
   Node* effect = NodeProperties::GetEffectInput(node);
   Node* control = NodeProperties::GetControlInput(node);
   if (value_type->Is(Type::Receiver())) {
     value = jsgraph()->TrueConstant();
   } else if (!value_type->Maybe(Type::Receiver())) {
     value = jsgraph()->FalseConstant();
   } else {
@@ skipping 427 matching lines @@
 }
 
 
 SimplifiedOperatorBuilder* JSIntrinsicLowering::simplified() const {
   return jsgraph()->simplified();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8