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| 1 // Copyright 2010 the V8 project authors. All rights reserved. |
| 2 // Redistribution and use in source and binary forms, with or without |
| 3 // modification, are permitted provided that the following conditions are |
| 4 // met: |
| 5 // |
| 6 // * Redistributions of source code must retain the above copyright |
| 7 // notice, this list of conditions and the following disclaimer. |
| 8 // * Redistributions in binary form must reproduce the above |
| 9 // copyright notice, this list of conditions and the following |
| 10 // disclaimer in the documentation and/or other materials provided |
| 11 // with the distribution. |
| 12 // * Neither the name of Google Inc. nor the names of its |
| 13 // contributors may be used to endorse or promote products derived |
| 14 // from this software without specific prior written permission. |
| 15 // |
| 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 |
| 28 #include "write-buffer.h" |
| 29 |
| 30 namespace v8 { |
| 31 namespace internal { |
| 32 |
| 33 Address* WriteBuffer::top_ = NULL; |
| 34 Address* WriteBuffer::start_ = NULL; |
| 35 Address* WriteBuffer::limit_ = NULL; |
| 36 VirtualMemory* WriteBuffer::virtual_memory_ = NULL; |
| 37 |
| 38 void WriteBuffer::Setup() { |
| 39 virtual_memory_ = new VirtualMemory(kWriteBufferSize * 3); |
| 40 uintptr_t start_as_int = |
| 41 reinterpret_cast<uintptr_t>(virtual_memory_->address()); |
| 42 start_ = |
| 43 reinterpret_cast<Address*>(RoundUp(start_as_int, kWriteBufferSize * 2)); |
| 44 limit_ = start_ + (kWriteBufferSize / sizeof(*start_)); |
| 45 |
| 46 ASSERT(reinterpret_cast<Address>(start_) >= virtual_memory_->address()); |
| 47 ASSERT(reinterpret_cast<Address>(limit_) >= virtual_memory_->address()); |
| 48 Address* vm_limit = reinterpret_cast<Address*>( |
| 49 reinterpret_cast<char*>(virtual_memory_->address()) + |
| 50 virtual_memory_->size()); |
| 51 ASSERT(start_ <= vm_limit); |
| 52 ASSERT(limit_ <= vm_limit); |
| 53 USE(vm_limit); |
| 54 ASSERT((reinterpret_cast<uintptr_t>(limit_) & kWriteBufferOverflowBit) != 0); |
| 55 ASSERT((reinterpret_cast<uintptr_t>(limit_ - 1) & kWriteBufferOverflowBit) == |
| 56 0); |
| 57 |
| 58 virtual_memory_->Commit(reinterpret_cast<Address>(start_), |
| 59 kWriteBufferSize, |
| 60 false); // Not executable. |
| 61 top_ = start_; |
| 62 } |
| 63 |
| 64 |
| 65 void WriteBuffer::TearDown() { |
| 66 delete virtual_memory_; |
| 67 top_ = start_ = limit_ = NULL; |
| 68 } |
| 69 |
| 70 |
| 71 void WriteBuffer::Compact() { |
| 72 top_ = start_; // TODO(gc) fix. |
| 73 } |
| 74 |
| 75 } } // namespace v8::internal |
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