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src/compiler/node-matchers.h

+// 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_NODE_MATCHERS_H_
+#define V8_COMPILER_NODE_MATCHERS_H_
+
+#include "src/compiler/common-operator.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+// A pattern matcher for nodes.
+struct NodeMatcher {
+  explicit NodeMatcher(Node* node) : node_(node) { }
+
+  Node* node() const { return node_; }
+  Operator* op() const { return node()->op(); }
+  IrOpcode::Value opcode() const { return node()->opcode(); }
+
+  bool HasProperty(Operator::Property property) const {
+    return op()->HasProperty(property);
+  }
+  Node* InputAt(int index) const { return node()->InputAt(index); }
+
+  #define DEFINE_IS_OPCODE(Opcode)  \
+    bool Is##Opcode() const { return opcode() == IrOpcode::k##Opcode; }
+  ALL_OP_LIST(DEFINE_IS_OPCODE)
+  #undef DEFINE_IS_OPCODE
+
+ private:
+  Node* node_;
+};
+
+
+// A pattern matcher for abitrary value constants.
+template <typename T>
+struct ValueMatcher : public NodeMatcher {
+  explicit ValueMatcher(Node* node)
+      : NodeMatcher(node), value_(),
+        has_value_(CommonOperatorTraits<T>::HasValue(node->op())) {
+    if (has_value_) value_ = CommonOperatorTraits<T>::ValueOf(node->op());
+  }
+
+  bool HasValue() const { return has_value_; }
+  T Value() const { ASSERT(HasValue()); return value_; }
+
+  bool Is(T value) const {
+    return HasValue() && CommonOperatorTraits<T>::Equals(Value(), value);
+  }
+
+  bool IsInRange(T low, T high) const {
+    return HasValue() && low <= value_ && value_ <= high;
+  }
+
+ private:
+  T value_;
+  bool has_value_;
+};
+
+
+// A pattern matcher for integer constants.
+template <typename T>
+struct IntMatcher V8_FINAL : public ValueMatcher<T> {
+  explicit IntMatcher(Node* node) : ValueMatcher<T>(node) { }
+
+  bool IsPowerOf2() const {
+    return this->HasValue() && this->Value() > 0 &&
+        (this->Value() & (this->Value() - 1)) == 0;
+  }
+};
+
+typedef IntMatcher<int32_t> Int32Matcher;
+typedef IntMatcher<uint32_t> Uint32Matcher;
+typedef IntMatcher<int64_t> Int64Matcher;
+typedef IntMatcher<uint64_t> Uint64Matcher;
+
+
+// A pattern matcher for floating point constants.
+template <typename T>
+struct FloatMatcher V8_FINAL : public ValueMatcher<T> {
+  explicit FloatMatcher(Node* node) : ValueMatcher<T>(node) { }
+
+  bool IsNaN() const {
+    return this->HasValue() && std::isnan(this->Value());
+  }
+};
+
+typedef FloatMatcher<double> Float64Matcher;
+
+
+// For shorter pattern matching code, this struct matches both the left and
+// right hand sides of a binary operation and can put constants on the right
+// if they appear on the left hand side of a commutative operation.
+template <typename Left, typename Right>
+struct BinopMatcher V8_FINAL : public NodeMatcher {
+  explicit BinopMatcher(Node* node)
+      : NodeMatcher(node), left_(InputAt(0)), right_(InputAt(1)) {
+    if (HasProperty(Operator::kCommutative)) PutConstantOnRight();
+  }
+
+  const Left& left() const { return left_; }
+  const Right& right() const { return right_; }
+
+  bool IsFoldable() const { return left().HasValue() && right().HasValue(); }
+  bool LeftEqualsRight() const { return left().node() == right().node(); }
+
+ private:
+  void PutConstantOnRight() {
+    if (left().HasValue() && !right().HasValue()) {
+      std::swap(left_, right_);
+      node()->ReplaceInput(0, left().node());
+      node()->ReplaceInput(1, right().node());
+    }
+  }
+
+  Left left_;
+  Right right_;
+};
+
+typedef BinopMatcher<Int32Matcher, Int32Matcher> Int32BinopMatcher;
+typedef BinopMatcher<Uint32Matcher, Uint32Matcher> Uint32BinopMatcher;
+typedef BinopMatcher<Int64Matcher, Int64Matcher> Int64BinopMatcher;
+typedef BinopMatcher<Uint64Matcher, Uint64Matcher> Uint64BinopMatcher;
+typedef BinopMatcher<Float64Matcher, Float64Matcher> Float64BinopMatcher;
+
+} } }  // namespace v8::internal::compiler
+
+#endif  // V8_COMPILER_NODE_MATCHERS_H_