[turbofan] Decouple inlining and native context specialization.

src/compiler/node-properties.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/common-operator.h"
 #include "src/compiler/graph.h"
+#include "src/compiler/linkage.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/operator-properties.h"
 #include "src/compiler/verifier.h"
 #include "src/types-inl.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // static
@@ skipping 269 matching lines @@
   }
 #ifdef DEBUG
   for (size_t index = 0; index < projection_count; ++index) {
     DCHECK_NOT_NULL(projections[index]);
   }
 #endif
 }
 
 
 // static
+MaybeHandle<Context> NodeProperties::GetSpecializationContext(
+    Node* node, MaybeHandle<Context> context) {
+  switch (node->opcode()) {
+    case IrOpcode::kHeapConstant:
+      return Handle<Context>::cast(OpParameter<Handle<HeapObject>>(node));
+    case IrOpcode::kParameter: {
+      Node* const start = NodeProperties::GetValueInput(node, 0);
+      DCHECK_EQ(IrOpcode::kStart, start->opcode());
+      int const index = ParameterIndexOf(node->op());
+      // The context is always the last parameter to a JavaScript function, and
+      // {Parameter} indices start at -1, so value outputs of {Start} look like
+      // this: closure, receiver, param0, ..., paramN, context.
+      if (index == start->op()->ValueOutputCount() - 2) {
+        return context;
+      }
+      break;
+    }
+    default:
+      break;
+  }
+  return MaybeHandle<Context>();
+}
+
+
+// static
+MaybeHandle<Context> NodeProperties::GetSpecializationNativeContext(
+    Node* node, MaybeHandle<Context> native_context) {
+  while (true) {
+    switch (node->opcode()) {
+      case IrOpcode::kJSCreateBlockContext:
+      case IrOpcode::kJSCreateCatchContext:
+      case IrOpcode::kJSCreateFunctionContext:
+      case IrOpcode::kJSCreateModuleContext:
+      case IrOpcode::kJSCreateScriptContext:
+      case IrOpcode::kJSCreateWithContext: {
+        // Skip over the intermediate contexts, we're only interested in the
+        // very last context in the context chain anyway.
+        node = NodeProperties::GetContextInput(node);
+        break;
+      }
+      case IrOpcode::kHeapConstant: {
+        // Extract the native context from the actual {context}.
+        Handle<Context> context =
+            Handle<Context>::cast(OpParameter<Handle<HeapObject>>(node));
+        return handle(context->native_context());
+      }
+      case IrOpcode::kOsrValue: {
+        int const index = OpParameter<int>(node);
+        if (index == Linkage::kOsrContextSpillSlotIndex) {
+          return native_context;
+        }
+        return MaybeHandle<Context>();
+      }
+      case IrOpcode::kParameter: {
+        Node* const start = NodeProperties::GetValueInput(node, 0);
+        DCHECK_EQ(IrOpcode::kStart, start->opcode());
+        int const index = ParameterIndexOf(node->op());
+        // The context is always the last parameter to a JavaScript function,
+        // and {Parameter} indices start at -1, so value outputs of {Start}
+        // look like this: closure, receiver, param0, ..., paramN, context.
+        if (index == start->op()->ValueOutputCount() - 2) {
+          return native_context;
+        }
+        return MaybeHandle<Context>();
+      }
+      default:
+        return MaybeHandle<Context>();
+    }
+  }
+}
+
+
+// static
+MaybeHandle<JSGlobalObject> NodeProperties::GetSpecializationGlobalObject(
+    Node* node, MaybeHandle<Context> native_context) {
+  Handle<Context> context;
+  if (GetSpecializationNativeContext(node, native_context).ToHandle(&context)) {
+    return handle(context->global_object());
+  }
+  return MaybeHandle<JSGlobalObject>();
+}
+
+
+// static
 Type* NodeProperties::GetTypeOrAny(Node* node) {
   return IsTyped(node) ? node->type() : Type::Any();
 }
 
 
 // static
 bool NodeProperties::AllValueInputsAreTyped(Node* node) {
   int input_count = node->op()->ValueInputCount();
   for (int index = 0; index < input_count; ++index) {
     if (!IsTyped(GetValueInput(node, index))) return false;
   }
   return true;
 }
 
 
 // static
 bool NodeProperties::IsInputRange(Edge edge, int first, int num) {
   if (num == 0) return false;
   int const index = edge.index();
   return first <= index && index < first + num;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8