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+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_DATAFLOW_H_
+#define V8_DATAFLOW_H_
+
+#include "v8.h"
+
+#include "ast.h"
+#include "compiler.h"
+#include "zone-inl.h"
+
+namespace v8 {
+namespace internal {
+
+// Forward declarations.
+class Node;
+
+class BitVector: public ZoneObject {
+ public:
+  // Iterator for the elements of this BitVector.
+  class Iterator BASE_EMBEDDED {
+   public:
+    explicit Iterator(BitVector* target)
+        : target_(target),
+          current_index_(0),
+          current_value_(target->data_[0]),
+          current_(-1) {
+      ASSERT(target->data_length_ > 0);
+      Advance();
+    }
+    ~Iterator() { }
+
+    bool Done() const { return current_index_ >= target_->data_length_; }
+    void Advance();
+
+    int Current() const {
+      ASSERT(!Done());
+      return current_;
+    }
+
+   private:
+    uint32_t SkipZeroBytes(uint32_t val) {
+      while ((val & 0xFF) == 0) {
+        val >>= 8;
+        current_ += 8;
+      }
+      return val;
+    }
+    uint32_t SkipZeroBits(uint32_t val) {
+      while ((val & 0x1) == 0) {
+        val >>= 1;
+        current_++;
+      }
+      return val;
+    }
+
+    BitVector* target_;
+    int current_index_;
+    uint32_t current_value_;
+    int current_;
+
+    friend class BitVector;
+  };
+
+  explicit BitVector(int length)
+      : length_(length),
+        data_length_(SizeFor(length)),
+        data_(ZONE->NewArray<uint32_t>(data_length_)) {
+    ASSERT(length > 0);
+    Clear();
+  }
+
+  BitVector(const BitVector& other)
+      : length_(other.length()),
+        data_length_(SizeFor(length_)),
+        data_(ZONE->NewArray<uint32_t>(data_length_)) {
+    CopyFrom(other);
+  }
+
+  static int SizeFor(int length) {
+    return 1 + ((length - 1) / 32);
+  }
+
+  BitVector& operator=(const BitVector& rhs) {
+    if (this != &rhs) CopyFrom(rhs);
+    return *this;
+  }
+
+  void CopyFrom(const BitVector& other) {
+    ASSERT(other.length() <= length());
+    for (int i = 0; i < other.data_length_; i++) {
+      data_[i] = other.data_[i];
+    }
+    for (int i = other.data_length_; i < data_length_; i++) {
+      data_[i] = 0;
+    }
+  }
+
+  bool Contains(int i) const {
+    ASSERT(i >= 0 && i < length());
+    uint32_t block = data_[i / 32];
+    return (block & (1U << (i % 32))) != 0;
+  }
+
+  void Add(int i) {
+    ASSERT(i >= 0 && i < length());
+    data_[i / 32] |= (1U << (i % 32));
+  }
+
+  void Remove(int i) {
+    ASSERT(i >= 0 && i < length());
+    data_[i / 32] &= ~(1U << (i % 32));
+  }
+
+  void Union(const BitVector& other) {
+    ASSERT(other.length() == length());
+    for (int i = 0; i < data_length_; i++) {
+      data_[i] |= other.data_[i];
+    }
+  }
+
+  bool UnionIsChanged(const BitVector& other) {
+    ASSERT(other.length() == length());
+    bool changed = false;
+    for (int i = 0; i < data_length_; i++) {
+      uint32_t old_data = data_[i];
+      data_[i] |= other.data_[i];
+      if (data_[i] != old_data) changed = true;
+    }
+    return changed;
+  }
+
+  void Intersect(const BitVector& other) {
+    ASSERT(other.length() == length());
+    for (int i = 0; i < data_length_; i++) {
+      data_[i] &= other.data_[i];
+    }
+  }
+
+  void Subtract(const BitVector& other) {
+    ASSERT(other.length() == length());
+    for (int i = 0; i < data_length_; i++) {
+      data_[i] &= ~other.data_[i];
+    }
+  }
+
+  void Clear() {
+    for (int i = 0; i < data_length_; i++) {
+      data_[i] = 0;
+    }
+  }
+
+  bool IsEmpty() const {
+    for (int i = 0; i < data_length_; i++) {
+      if (data_[i] != 0) return false;
+    }
+    return true;
+  }
+
+  bool Equals(const BitVector& other) {
+    for (int i = 0; i < data_length_; i++) {
+      if (data_[i] != other.data_[i]) return false;
+    }
+    return true;
+  }
+
+  int length() const { return length_; }
+
+#ifdef DEBUG
+  void Print();
+#endif
+
+ private:
+  int length_;
+  int data_length_;
+  uint32_t* data_;
+};
+
+
+// An implementation of a sparse set whose elements are drawn from integers
+// in the range [0..universe_size[.  It supports constant-time Contains,
+// destructive Add, and destructuve Remove operations and linear-time (in
+// the number of elements) destructive Union.
+class SparseSet: public ZoneObject {
+ public:
+  // Iterator for sparse set elements.  Elements should not be added or
+  // removed during iteration.
+  class Iterator BASE_EMBEDDED {
+   public:
+    explicit Iterator(SparseSet* target) : target_(target), current_(0) {
+      ASSERT(++target->iterator_count_ > 0);
+    }
+    ~Iterator() {
+      ASSERT(target_->iterator_count_-- > 0);
+    }
+    bool Done() const { return current_ >= target_->dense_.length(); }
+    void Advance() {
+      ASSERT(!Done());
+      ++current_;
+    }
+    int Current() {
+      ASSERT(!Done());
+      return target_->dense_[current_];
+    }
+
+   private:
+    SparseSet* target_;
+    int current_;
+
+    friend class SparseSet;
+  };
+
+  explicit SparseSet(int universe_size)
+      : dense_(4),
+        sparse_(ZONE->NewArray<int>(universe_size)) {
+#ifdef DEBUG
+    size_ = universe_size;
+    iterator_count_ = 0;
+#endif
+  }
+
+  bool Contains(int n) const {
+    ASSERT(0 <= n && n < size_);
+    int dense_index = sparse_[n];
+    return (0 <= dense_index) &&
+        (dense_index < dense_.length()) &&
+        (dense_[dense_index] == n);
+  }
+
+  void Add(int n) {
+    ASSERT(0 <= n && n < size_);
+    ASSERT(iterator_count_ == 0);
+    if (!Contains(n)) {
+      sparse_[n] = dense_.length();
+      dense_.Add(n);
+    }
+  }
+
+  void Remove(int n) {
+    ASSERT(0 <= n && n < size_);
+    ASSERT(iterator_count_ == 0);
+    if (Contains(n)) {
+      int dense_index = sparse_[n];
+      int last = dense_.RemoveLast();
+      if (dense_index < dense_.length()) {
+        dense_[dense_index] = last;
+        sparse_[last] = dense_index;
+      }
+    }
+  }
+
+  void Union(const SparseSet& other) {
+    for (int i = 0; i < other.dense_.length(); ++i) {
+      Add(other.dense_[i]);
+    }
+  }
+
+ private:
+  // The set is implemented as a pair of a growable dense list and an
+  // uninitialized sparse array.
+  ZoneList<int> dense_;
+  int* sparse_;
+#ifdef DEBUG
+  int size_;
+  int iterator_count_;
+#endif
+};
+
+
+// Simple fixed-capacity list-based worklist (managed as a queue) of
+// pointers to T.
+template<typename T>
+class WorkList BASE_EMBEDDED {
+ public:
+  // The worklist cannot grow bigger than size.  We keep one item empty to
+  // distinguish between empty and full.
+  explicit WorkList(int size)
+      : capacity_(size + 1), head_(0), tail_(0), queue_(capacity_) {
+    for (int i = 0; i < capacity_; i++) queue_.Add(NULL);
+  }
+
+  bool is_empty() { return head_ == tail_; }
+
+  bool is_full() {
+    // The worklist is full if head is at 0 and tail is at capacity - 1:
+    //   head == 0 && tail == capacity-1 ==> tail - head == capacity - 1
+    // or if tail is immediately to the left of head:
+    //   tail+1 == head  ==> tail - head == -1
+    int diff = tail_ - head_;
+    return (diff == -1 || diff == capacity_ - 1);
+  }
+
+  void Insert(T* item) {
+    ASSERT(!is_full());
+    queue_[tail_++] = item;
+    if (tail_ == capacity_) tail_ = 0;
+  }
+
+  T* Remove() {
+    ASSERT(!is_empty());
+    T* item = queue_[head_++];
+    if (head_ == capacity_) head_ = 0;
+    return item;
+  }
+
+ private:
+  int capacity_;  // Including one empty slot.
+  int head_;      // Where the first item is.
+  int tail_;      // Where the next inserted item will go.
+  List<T*> queue_;
+};
+
+
+// Computes the set of assigned variables and annotates variables proxies
+// that are trivial sub-expressions and for-loops where the loop variable
+// is guaranteed to be a smi.
+class AssignedVariablesAnalyzer : public AstVisitor {
+ public:
+  static bool Analyze(CompilationInfo* info);
+
+ private:
+  AssignedVariablesAnalyzer(CompilationInfo* info, int bits);
+  bool Analyze();
+
+  Variable* FindSmiLoopVariable(ForStatement* stmt);
+
+  int BitIndex(Variable* var);
+
+  void RecordAssignedVar(Variable* var);
+
+  void MarkIfTrivial(Expression* expr);
+
+  // Visits an expression saving the accumulator before, clearing
+  // it before visting and restoring it after visiting.
+  void ProcessExpression(Expression* expr);
+
+  // AST node visit functions.
+#define DECLARE_VISIT(type) virtual void Visit##type(type* node);
+  AST_NODE_LIST(DECLARE_VISIT)
+#undef DECLARE_VISIT
+
+  CompilationInfo* info_;
+
+  // Accumulator for assigned variables set.
+  BitVector av_;
+
+  DISALLOW_COPY_AND_ASSIGN(AssignedVariablesAnalyzer);
+};
+
+
+} }  // namespace v8::internal
+
+
+#endif  // V8_DATAFLOW_H_