kmillikin@google.com
e4030da968
During basic block discovery, compute assigned variables in each block. After computing immediate dominators, compute dominance frontiers. Both of these will be used for SSA construction. R=fschneider@google.com,srdjan@google.com BUG= TEST= Review URL: https://chromiumcodereview.appspot.com//10377104 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@7685 260f80e4-7a28-3924-810f-c04153c831b5
85 lines
1.9 KiB
C++
85 lines
1.9 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef VM_BIT_VECTOR_H_
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#define VM_BIT_VECTOR_H_
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#include "vm/allocation.h"
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#include "vm/isolate.h"
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#include "vm/zone.h"
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namespace dart {
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// Bit vector implementation.
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class BitVector: public ZoneAllocated {
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public:
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// Iterator for the elements of this BitVector.
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class Iterator : public ValueObject {
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public:
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explicit Iterator(BitVector* target)
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: target_(target),
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bit_index_(-1),
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word_index_(0),
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current_word_(target->data_[0]) {
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ASSERT(target->data_length_ > 0);
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Advance();
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}
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~Iterator() { }
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bool Done() const { return word_index_ >= target_->data_length_; }
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void Advance();
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intptr_t Current() const {
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ASSERT(!Done());
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return bit_index_;
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}
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private:
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BitVector* target_;
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intptr_t bit_index_;
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intptr_t word_index_;
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uword current_word_;
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friend class BitVector;
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};
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explicit BitVector(intptr_t length)
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: length_(length),
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data_length_(SizeFor(length)),
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data_(reinterpret_cast<uword*>(
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Isolate::Current()->current_zone()->Allocate(
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data_length_ * sizeof(uword)))) {
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ASSERT(length > 0);
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Clear();
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}
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static intptr_t SizeFor(intptr_t length) {
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return 1 + ((length - 1) / kBitsPerWord);
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}
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void Add(intptr_t i) {
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ASSERT(i >= 0 && i < length());
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data_[i / kBitsPerWord] |= (static_cast<uword>(1) << (i % kBitsPerWord));
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}
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void Clear() {
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for (intptr_t i = 0; i < data_length_; i++) {
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data_[i] = 0;
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}
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}
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intptr_t length() const { return length_; }
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private:
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intptr_t length_;
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intptr_t data_length_;
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uword* data_;
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DISALLOW_COPY_AND_ASSIGN(BitVector);
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};
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} // namespace dart
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#endif // VM_BIT_VECTOR_H_
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