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src/compiler/generic-node.h

Index: src/compiler/generic-node.h
diff --git a/src/compiler/generic-node.h b/src/compiler/generic-node.h
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+// Copyright 2013 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_GENERIC_NODE_H_
+#define V8_COMPILER_GENERIC_NODE_H_
+
+#include <deque>
+
+#include "src/v8.h"
+
+#include "src/compiler/operator.h"
+#include "src/zone.h"
+#include "src/zone-allocator.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+class Operator;
+class GenericGraphBase;
+
+typedef int NodeId;
+
+// A GenericNode<> is the basic primitive of graphs. GenericNode's are
+// chained together by input/use chains but by default otherwise contain only an
+// identifying number which specific applications of graphs and nodes can use
+// to index auxiliary out-of-line data, especially transient data.
+// Specializations of the templatized GenericNode<> class must provide a base
+// class B that contains all of the members to be made available in each
+// specialized Node instance. GenericNode uses a mixin template pattern to
+// ensure that common accessors and methods expect the derived class S type
+// rather than the GenericNode<B, S> type.
+template <class B, class S>
+class GenericNode : public B {
+ public:
+  typedef B BaseClass;
+  typedef S DerivedClass;
+
+  inline NodeId id() const { return id_; }
+
+  int InputCount() const { return input_count_; }
+  S* InputAt(int index) const {
+    return static_cast<S*>(GetInputRecordPtr(index)->to);
+  }
+  void ReplaceInput(int index, GenericNode* new_input);
+  void AppendInput(Zone* zone, GenericNode* new_input);
+  void InsertInput(Zone* zone, int index, GenericNode* new_input);
+
+  int UseCount() { return use_count_; }
+  S* UseAt(int index) {
+    ASSERT(index < use_count_);
+    Use* current = first_use_;
+    while (index-- != 0) {
+      current = current->next;
+    }
+    return static_cast<S*>(current->from);
+  }
+  inline void ReplaceUses(GenericNode* replace_to);
+  template <class UnaryPredicate>
+  inline void ReplaceUsesIf(UnaryPredicate pred, GenericNode* replace_to);
+  void RemoveAllInputs();
+
+  void TrimInputCount(int input_count);
+
+  class Inputs {
+   public:
+    class iterator;
+    iterator begin();
+    iterator end();
+
+    explicit Inputs(GenericNode* node) : node_(node) {}
+
+   private:
+    GenericNode* node_;
+  };
+
+  Inputs inputs() { return Inputs(this); }
+
+  class Uses {
+   public:
+    class iterator;
+    iterator begin();
+    iterator end();
+    bool empty() { return begin() == end(); }
+
+    explicit Uses(GenericNode* node) : node_(node) {}
+
+   private:
+    GenericNode* node_;
+  };
+
+  Uses uses() { return Uses(this); }
+
+  class Edge;
+
+  bool OwnedBy(GenericNode* owner) const;
+
+  static S* New(GenericGraphBase* graph, int input_count, S** inputs);
+
+ protected:
+  friend class GenericGraphBase;
+
+  class Use : public ZoneObject {
+   public:
+    GenericNode* from;
+    Use* next;
+    Use* prev;
+    int input_index;
+  };
+
+  class Input {
+   public:
+    GenericNode* to;
+    Use* use;
+
+    void Update(GenericNode* new_to);
+  };
+
+  void EnsureAppendableInputs(Zone* zone);
+
+  Input* GetInputRecordPtr(int index) const {
+    if (has_appendable_inputs_) {
+      return &((*inputs_.appendable_)[index]);
+    } else {
+      return inputs_.static_ + index;
+    }
+  }
+
+  void AppendUse(Use* use);
+  void RemoveUse(Use* use);
+
+  void* operator new(size_t, void* location) { return location; }
+
+  GenericNode(GenericGraphBase* graph, int input_count);
+
+ private:
+  void AssignUniqueID(GenericGraphBase* graph);
+
+  typedef zone_allocator<Input> ZoneInputAllocator;
+  typedef std::deque<Input, ZoneInputAllocator> InputDeque;
+
+  NodeId id_;
+  int input_count_ : 31;
+  bool has_appendable_inputs_ : 1;
+  union {
+    // When a node is initially allocated, it uses a static buffer to hold its
+    // inputs under the assumption that the number of outputs will not increase.
+    // When the first input is appended, the static buffer is converted into a
+    // deque to allow for space-efficient growing.
+    Input* static_;
+    InputDeque* appendable_;
+  } inputs_;
+  int use_count_;
+  Use* first_use_;
+  Use* last_use_;
+
+  DISALLOW_COPY_AND_ASSIGN(GenericNode);
+};
+
+// An encapsulation for information associated with a single use of node as a
+// input from another node, allowing access to both the defining node and
+// the ndoe having the input.
+template <class B, class S>
+class GenericNode<B, S>::Edge {
+ public:
+  S* from() const { return static_cast<S*>(input_->use->from); }
+  S* to() const { return static_cast<S*>(input_->to); }
+  int index() const {
+    int index = input_->use->input_index;
+    ASSERT(index < input_->use->from->input_count_);
+    return index;
+  }
+
+ private:
+  friend class GenericNode<B, S>::Uses::iterator;
+  friend class GenericNode<B, S>::Inputs::iterator;
+
+  explicit Edge(typename GenericNode<B, S>::Input* input) : input_(input) {}
+
+  typename GenericNode<B, S>::Input* input_;
+};
+
+// A forward iterator to visit the nodes which are depended upon by a node
+// in the order of input.
+template <class B, class S>
+class GenericNode<B, S>::Inputs::iterator {
+ public:
+  iterator(const typename GenericNode<B, S>::Inputs::iterator& other)  // NOLINT
+      : node_(other.node_),
+        index_(other.index_) {}
+
+  S* operator*() { return static_cast<S*>(GetInput()->to); }
+  typename GenericNode<B, S>::Edge edge() {
+    return typename GenericNode::Edge(GetInput());
+  }
+  bool operator==(const iterator& other) const {
+    return other.index_ == index_ && other.node_ == node_;
+  }
+  bool operator!=(const iterator& other) const { return !(other == *this); }
+  iterator& operator++() {
+    ASSERT(node_ != NULL);
+    ASSERT(index_ < node_->input_count_);
+    ++index_;
+    return *this;
+  }
+  int index() { return index_; }
+
+ private:
+  friend class GenericNode;
+
+  explicit iterator(GenericNode* node, int index)
+      : node_(node), index_(index) {}
+
+  Input* GetInput() const { return node_->GetInputRecordPtr(index_); }
+
+  GenericNode* node_;
+  int index_;
+};
+
+// A forward iterator to visit the uses of a node. The uses are returned in
+// the order in which they were added as inputs.
+template <class B, class S>
+class GenericNode<B, S>::Uses::iterator {
+ public:
+  iterator(const typename GenericNode<B, S>::Uses::iterator& other)  // NOLINT
+      : current_(other.current_),
+        index_(other.index_) {}
+
+  S* operator*() { return static_cast<S*>(current_->from); }
+  typename GenericNode<B, S>::Edge edge() {
+    return typename GenericNode::Edge(CurrentInput());
+  }
+
+  bool operator==(const iterator& other) { return other.current_ == current_; }
+  bool operator!=(const iterator& other) { return other.current_ != current_; }
+  iterator& operator++() {
+    ASSERT(current_ != NULL);
+    index_++;
+    current_ = current_->next;
+    return *this;
+  }
+  iterator& UpdateToAndIncrement(GenericNode<B, S>* new_to) {
+    ASSERT(current_ != NULL);
+    index_++;
+    typename GenericNode<B, S>::Input* input = CurrentInput();
+    current_ = current_->next;
+    input->Update(new_to);
+    return *this;
+  }
+  int index() const { return index_; }
+
+ private:
+  friend class GenericNode<B, S>::Uses;
+
+  iterator() : current_(NULL), index_(0) {}
+  explicit iterator(GenericNode<B, S>* node)
+      : current_(node->first_use_), index_(0) {}
+
+  Input* CurrentInput() const {
+    return current_->from->GetInputRecordPtr(current_->input_index);
+  }
+
+  typename GenericNode<B, S>::Use* current_;
+  int index_;
+};
+}
+}
+}  // namespace v8::internal::compiler
+
+#endif  // V8_COMPILER_GENERIC_NODE_H_