1 files changed, 42 insertions, 6 deletions
diff --git a/Source/WTF/wtf/FastBitVector.cpp b/Source/WTF/wtf/FastBitVector.cpp
index 3abccea73..eed316975 100644
--- a/Source/WTF/wtf/FastBitVector.cpp
+++ b/Source/WTF/wtf/FastBitVector.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Apple Inc. All rights reserved.
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -26,14 +26,50 @@
 #include "config.h"
 #include "FastBitVector.h"
 
-#include "PrintStream.h"
-
 namespace WTF {
 
-void FastBitVector::dump(PrintStream& out) const
+void FastBitVectorWordOwner::setEqualsSlow(const FastBitVectorWordOwner& other)
+{
+    uint32_t* newArray = static_cast<uint32_t*>(
+        fastCalloc(other.arrayLength(), sizeof(uint32_t)));
+    memcpy(newArray, other.m_words, other.arrayLength() * sizeof(uint32_t));
+    if (m_words)
+        fastFree(m_words);
+    m_words = newArray;
+    m_numBits = other.m_numBits;
+}
+
+void FastBitVectorWordOwner::resizeSlow(size_t numBits)
+{
+    size_t newLength = fastBitVectorArrayLength(numBits);
+    
+    // Use fastCalloc instead of fastRealloc because we expect the common
+    // use case for this method to be initializing the size of the bitvector.
+    
+    uint32_t* newArray = static_cast<uint32_t*>(fastCalloc(newLength, sizeof(uint32_t)));
+    memcpy(newArray, m_words, arrayLength() * sizeof(uint32_t));
+    if (m_words)
+        fastFree(m_words);
+    m_words = newArray;
+}
+
+void FastBitVector::clearRange(size_t begin, size_t end)
 {
-    for (unsigned i = 0; i < m_numBits; ++i)
-        out.print(get(i) ? "1" : "-");
+    if (end - begin < 32) {
+        for (size_t i = begin; i < end; ++i)
+            at(i) = false;
+        return;
+    }
+    
+    size_t endBeginSlop = (begin + 31) & ~31;
+    size_t beginEndSlop = end & ~31;
+    
+    for (size_t i = begin; i < endBeginSlop; ++i)
+        at(i) = false;
+    for (size_t i = beginEndSlop; i < end; ++i)
+        at(i) = false;
+    for (size_t i = endBeginSlop / 32; i < beginEndSlop / 32; ++i)
+        m_words.word(i) = 0;
 }
 
 } // namespace WTF