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// Copyright 2012 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 "allocation.h"
#include "ast.h"
#include "compiler.h"
#include "zone-inl.h"
namespace v8 {
namespace internal {
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;
};
BitVector(int length, Zone* zone)
: length_(length),
data_length_(SizeFor(length)),
data_(zone->NewArray<uint32_t>(data_length_)) {
ASSERT(length > 0);
Clear();
}
BitVector(const BitVector& other, Zone* zone)
: 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_;
};
} } // namespace v8::internal
#endif // V8_DATAFLOW_H_