Add missing files from last commit.

src/write-buffer.cc

Index: src/write-buffer.cc
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--- src/write-buffer.cc	(revision 0)
+++ src/write-buffer.cc	(revision 0)
@@ -0,0 +1,75 @@
+// Copyright 2010 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.
+
+#include "write-buffer.h"
+
+namespace v8 {
+namespace internal {
+
+Address* WriteBuffer::top_ = NULL;
+Address* WriteBuffer::start_ = NULL;
+Address* WriteBuffer::limit_ = NULL;
+VirtualMemory* WriteBuffer::virtual_memory_ = NULL;
+
+void WriteBuffer::Setup() {
+  virtual_memory_ = new VirtualMemory(kWriteBufferSize * 3);
+  uintptr_t start_as_int =
+      reinterpret_cast<uintptr_t>(virtual_memory_->address());
+  start_ =
+      reinterpret_cast<Address*>(RoundUp(start_as_int, kWriteBufferSize * 2));
+  limit_ = start_ + (kWriteBufferSize / sizeof(*start_));
+
+  ASSERT(reinterpret_cast<Address>(start_) >= virtual_memory_->address());
+  ASSERT(reinterpret_cast<Address>(limit_) >= virtual_memory_->address());
+  Address* vm_limit = reinterpret_cast<Address*>(
+      reinterpret_cast<char*>(virtual_memory_->address()) +
+          virtual_memory_->size());
+  ASSERT(start_ <= vm_limit);
+  ASSERT(limit_ <= vm_limit);
+  USE(vm_limit);
+  ASSERT((reinterpret_cast<uintptr_t>(limit_) & kWriteBufferOverflowBit) != 0);
+  ASSERT((reinterpret_cast<uintptr_t>(limit_ - 1) & kWriteBufferOverflowBit) ==
+         0);
+
+  virtual_memory_->Commit(reinterpret_cast<Address>(start_),
+                          kWriteBufferSize,
+                          false);  // Not executable.
+  top_ = start_;
+}
+
+
+void WriteBuffer::TearDown() {
+  delete virtual_memory_;
+  top_ = start_ = limit_ = NULL;
+}
+
+
+void WriteBuffer::Compact() {
+  top_ = start_;   // TODO(gc) fix.
+}
+
+} }  // namespace v8::internal