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src/compiler/js-graph.h

Index: src/compiler/js-graph.h
diff --git a/src/compiler/js-graph.h b/src/compiler/js-graph.h
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+// Copyright 2014 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.
+
+#ifndef V8_COMPILER_JS_GRAPH_H_
+#define V8_COMPILER_JS_GRAPH_H_
+
+#include "src/compiler/common-node-cache.h"
+#include "src/compiler/common-operator.h"
+#include "src/compiler/graph.h"
+#include "src/compiler/js-operator.h"
+#include "src/compiler/node-properties.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+class Typer;
+
+// Implements a facade on a Graph, enhancing the graph with JS-specific
+// notions, including a builder for for JS* operators, canonicalized global
+// constants, and various helper methods.
+class JSGraph : public ZoneObject {
+ public:
+  JSGraph(Graph* graph, CommonOperatorBuilder* common, Typer* typer)
+      : graph_(graph),
+        common_(common),
+        javascript_(zone()),
+        typer_(typer),
+        cache_(zone()) {}
+
+  // Canonicalized global constants.
+  Node* UndefinedConstant();
+  Node* TheHoleConstant();
+  Node* TrueConstant();
+  Node* FalseConstant();
+  Node* NullConstant();
+  Node* ZeroConstant();
+  Node* OneConstant();
+  Node* NaNConstant();
+
+  // Creates a HeapConstant node, possibly canonicalized, without inspecting the
+  // object.
+  Node* HeapConstant(PrintableUnique<Object> value);
+
+  // Creates a HeapConstant node, possibly canonicalized, and may access the
+  // heap to inspect the object.
+  Node* HeapConstant(Handle<Object> value);
+
+  // Creates a Constant node of the appropriate type for the given object.
+  // Accesses the heap to inspect the object and determine whether one of the
+  // canonicalized globals or a number constant should be returned.
+  Node* Constant(Handle<Object> value);
+
+  // Creates a NumberConstant node, usually canonicalized.
+  Node* Constant(double value);
+
+  // Creates a NumberConstant node, usually canonicalized.
+  Node* Constant(int32_t value);
+
+  // Creates a Int32Constant node, usually canonicalized.
+  Node* Int32Constant(int32_t value);
+
+  // Creates a Float64Constant node, usually canonicalized.
+  Node* Float64Constant(double value);
+
+  // Creates an ExternalConstant node, usually canonicalized.
+  Node* ExternalConstant(ExternalReference ref);
+
+  Node* SmiConstant(int32_t immediate) {
+    ASSERT(Smi::IsValid(immediate));
+    return Constant(immediate);
+  }
+
+  JSOperatorBuilder* javascript() { return &javascript_; }
+  CommonOperatorBuilder* common() { return common_; }
+  Graph* graph() { return graph_; }
+  Zone* zone() { return graph()->zone(); }
+
+ private:
+  Graph* graph_;
+  CommonOperatorBuilder* common_;
+  JSOperatorBuilder javascript_;
+  Typer* typer_;
+
+  SetOncePointer<Node> undefined_constant_;
+  SetOncePointer<Node> the_hole_constant_;
+  SetOncePointer<Node> true_constant_;
+  SetOncePointer<Node> false_constant_;
+  SetOncePointer<Node> null_constant_;
+  SetOncePointer<Node> zero_constant_;
+  SetOncePointer<Node> one_constant_;
+  SetOncePointer<Node> nan_constant_;
+
+  CommonNodeCache cache_;
+
+  Node* ImmovableHeapConstant(Handle<Object> value);
+  Node* NumberConstant(double value);
+  Node* NewNode(Operator* op);
+
+  Factory* factory() { return zone()->isolate()->factory(); }
+};
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
+
+#endif