2 * Copyright (C) 2011 Apple Inc. All rights reserved.
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27 #include "BitVector.h"
31 #include <wtf/Assertions.h>
32 #include <wtf/FastMalloc.h>
33 #include <wtf/StdLibExtras.h>
37 void BitVector::setSlow(const BitVector& other)
39 uintptr_t newBitsOrPointer;
41 newBitsOrPointer = other.m_bitsOrPointer;
43 OutOfLineBits* newOutOfLineBits = OutOfLineBits::create(other.size());
44 memcpy(newOutOfLineBits->bits(), other.bits(), byteCount(other.size()));
45 newBitsOrPointer = bitwise_cast<uintptr_t>(newOutOfLineBits) >> 1;
48 OutOfLineBits::destroy(outOfLineBits());
49 m_bitsOrPointer = newBitsOrPointer;
52 void BitVector::resize(size_t numBits)
54 if (numBits <= maxInlineBits()) {
58 OutOfLineBits* myOutOfLineBits = outOfLineBits();
59 m_bitsOrPointer = makeInlineBits(*myOutOfLineBits->bits());
60 OutOfLineBits::destroy(myOutOfLineBits);
64 resizeOutOfLine(numBits);
67 void BitVector::clearAll()
70 m_bitsOrPointer = makeInlineBits(0);
72 memset(outOfLineBits()->bits(), 0, byteCount(size()));
75 BitVector::OutOfLineBits* BitVector::OutOfLineBits::create(size_t numBits)
77 numBits = (numBits + bitsInPointer() - 1) & ~(bitsInPointer() - 1);
78 size_t size = sizeof(OutOfLineBits) + sizeof(uintptr_t) * (numBits / bitsInPointer());
79 OutOfLineBits* result = new (NotNull, fastMalloc(size)) OutOfLineBits(numBits);
83 void BitVector::OutOfLineBits::destroy(OutOfLineBits* outOfLineBits)
85 fastFree(outOfLineBits);
88 void BitVector::resizeOutOfLine(size_t numBits)
90 ASSERT(numBits > maxInlineBits());
91 OutOfLineBits* newOutOfLineBits = OutOfLineBits::create(numBits);
92 size_t newNumWords = newOutOfLineBits->numWords();
94 // Make sure that all of the bits are zero in case we do a no-op resize.
95 *newOutOfLineBits->bits() = m_bitsOrPointer & ~(static_cast<uintptr_t>(1) << maxInlineBits());
96 memset(newOutOfLineBits->bits() + 1, 0, (newNumWords - 1) * sizeof(void*));
98 if (numBits > size()) {
99 size_t oldNumWords = outOfLineBits()->numWords();
100 memcpy(newOutOfLineBits->bits(), outOfLineBits()->bits(), oldNumWords * sizeof(void*));
101 memset(newOutOfLineBits->bits() + oldNumWords, 0, (newNumWords - oldNumWords) * sizeof(void*));
103 memcpy(newOutOfLineBits->bits(), outOfLineBits()->bits(), newOutOfLineBits->numWords() * sizeof(void*));
104 OutOfLineBits::destroy(outOfLineBits());
106 m_bitsOrPointer = bitwise_cast<uintptr_t>(newOutOfLineBits) >> 1;
109 void BitVector::dump(FILE* out)
111 for (size_t i = 0; i < size(); ++i) {