1 files changed, 111 insertions, 0 deletions
diff --git a/js/src/jit/BitSet.cpp b/js/src/jit/BitSet.cpp
new file mode 100644
index 0000000000..b791ea387c
--- /dev/null
+++ b/js/src/jit/BitSet.cpp
@@ -0,0 +1,111 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "jit/BitSet.h"
+
+#include <string.h>
+
+#include "jit/JitAllocPolicy.h"
+
+using namespace js;
+using namespace js::jit;
+
+bool BitSet::init(TempAllocator& alloc) {
+  size_t sizeRequired = numWords() * sizeof(*bits_);
+
+  bits_ = (uint32_t*)alloc.allocate(sizeRequired);
+  if (!bits_) {
+    return false;
+  }
+
+  memset(bits_, 0, sizeRequired);
+
+  return true;
+}
+
+bool BitSet::empty() const {
+  MOZ_ASSERT(bits_);
+  const uint32_t* bits = bits_;
+  for (unsigned int i = 0, e = numWords(); i < e; i++) {
+    if (bits[i]) {
+      return false;
+    }
+  }
+  return true;
+}
+
+void BitSet::insertAll(const BitSet& other) {
+  MOZ_ASSERT(bits_);
+  MOZ_ASSERT(other.numBits_ == numBits_);
+  MOZ_ASSERT(other.bits_);
+
+  uint32_t* bits = bits_;
+  const uint32_t* otherBits = other.bits_;
+  for (unsigned int i = 0, e = numWords(); i < e; i++) {
+    bits[i] |= otherBits[i];
+  }
+}
+
+void BitSet::removeAll(const BitSet& other) {
+  MOZ_ASSERT(bits_);
+  MOZ_ASSERT(other.numBits_ == numBits_);
+  MOZ_ASSERT(other.bits_);
+
+  uint32_t* bits = bits_;
+  const uint32_t* otherBits = other.bits_;
+  for (unsigned int i = 0, e = numWords(); i < e; i++) {
+    bits[i] &= ~otherBits[i];
+  }
+}
+
+void BitSet::intersect(const BitSet& other) {
+  MOZ_ASSERT(bits_);
+  MOZ_ASSERT(other.numBits_ == numBits_);
+  MOZ_ASSERT(other.bits_);
+
+  uint32_t* bits = bits_;
+  const uint32_t* otherBits = other.bits_;
+  for (unsigned int i = 0, e = numWords(); i < e; i++) {
+    bits[i] &= otherBits[i];
+  }
+}
+
+// returns true if the intersection caused the contents of the set to change.
+bool BitSet::fixedPointIntersect(const BitSet& other) {
+  MOZ_ASSERT(bits_);
+  MOZ_ASSERT(other.numBits_ == numBits_);
+  MOZ_ASSERT(other.bits_);
+
+  bool changed = false;
+
+  uint32_t* bits = bits_;
+  const uint32_t* otherBits = other.bits_;
+  for (unsigned int i = 0, e = numWords(); i < e; i++) {
+    uint32_t old = bits[i];
+    bits[i] &= otherBits[i];
+
+    if (!changed && old != bits[i]) {
+      changed = true;
+    }
+  }
+  return changed;
+}
+
+void BitSet::complement() {
+  MOZ_ASSERT(bits_);
+  uint32_t* bits = bits_;
+  for (unsigned int i = 0, e = numWords(); i < e; i++) {
+    bits[i] = ~bits[i];
+  }
+}
+
+void BitSet::clear() {
+  MOZ_ASSERT(bits_);
+  uint32_t* bits = bits_;
+  for (unsigned int i = 0, e = numWords(); i < e; i++) {
+    bits[i] = 0;
+  }
+}