| 1 | /*
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| 2 | * Copyright (C) 2008 Apple Inc. All rights reserved.
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| 3 | *
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| 4 | * Redistribution and use in source and binary forms, with or without
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| 5 | * modification, are permitted provided that the following conditions
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| 6 | * are met:
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| 7 | *
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| 8 | * 1. Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
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| 14 | * its contributors may be used to endorse or promote products derived
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| 15 | * from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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| 18 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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| 19 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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| 20 | * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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| 21 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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| 22 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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| 23 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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| 24 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #include "config.h"
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| 30 | #include "RegisterFile.h"
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| 31 |
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| 32 | namespace JSC {
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| 33 |
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| 34 | RegisterFile::~RegisterFile()
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| 35 | {
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| 36 | #if HAVE(MMAP)
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| 37 | munmap(m_buffer, ((m_max - m_start) + m_maxGlobals) * sizeof(Register));
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| 38 | #elif HAVE(VIRTUALALLOC)
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| 39 | VirtualFree(m_buffer, 0, MEM_RELEASE);
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| 40 | #else
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| 41 | #error "Don't know how to release virtual memory on this platform."
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| 42 | #endif
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| 43 | }
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| 44 |
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| 45 | void RegisterFile::releaseExcessCapacity()
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| 46 | {
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| 47 | m_maxUsed = m_start;
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| 48 | void* memoryToRelease = reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(reinterpret_cast<char*>(m_start) + commitSize * 2 - 1) & ~(commitSize - 1));
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| 49 | ptrdiff_t size = reinterpret_cast<char*>(m_end) - reinterpret_cast<char*>(memoryToRelease);
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| 50 | #if HAVE(MMAP) && !HAVE(VIRTUALALLOC)
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| 51 | while (madvise(memoryToRelease, size, MADV_FREE) == -1 && errno == EAGAIN) { }
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| 52 | #elif HAVE(VIRTUALALLOC)
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| 53 | VirtualFree(memoryToRelease, size, MEM_DECOMMIT);
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| 54 | m_commitEnd = reinterpret_cast<Register*>(memoryToRelease);
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| 55 | #endif
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| 56 | }
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| 57 |
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| 58 | } // namespace JSC
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