sgjesse@google.com
65896148c9
Moved additional parts of globals.h from vm/ to platform/ to support types and constants used by utils.*. R=ager@google.com, iposva@google.com BUG= TEST= Review URL: http://codereview.chromium.org//9209001 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@3337 260f80e4-7a28-3924-810f-c04153c831b5
76 lines
1.8 KiB
C++
76 lines
1.8 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/virtual_memory.h"
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#include <sys/mman.h>
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#include <unistd.h>
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#include "platform/assert.h"
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#include "platform/utils.h"
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namespace dart {
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// standard MAP_FAILED causes "error: use of old-style cast" as it
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// defines MAP_FAILED as ((void *) -1)
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#undef MAP_FAILED
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#define MAP_FAILED reinterpret_cast<void*>(-1)
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uword VirtualMemory::page_size_ = 0;
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void VirtualMemory::InitOnce() {
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page_size_ = getpagesize();
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}
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VirtualMemory* VirtualMemory::Reserve(intptr_t size) {
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ASSERT((size & (PageSize() - 1)) == 0);
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void* address = mmap(NULL, size, PROT_NONE,
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MAP_PRIVATE | MAP_ANON | MAP_NORESERVE,
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-1, 0);
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if (address == MAP_FAILED) {
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return NULL;
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}
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MemoryRegion region(address, size);
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return new VirtualMemory(region, NULL);
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}
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static void unmap(void* address, intptr_t size) {
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if (size == 0) {
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return;
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}
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if (munmap(address, size) != 0) {
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FATAL("munmap failed\n");
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}
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}
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VirtualMemory::~VirtualMemory() {
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unmap(address(), size());
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}
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void VirtualMemory::FreeSubSegment(void* address, intptr_t size) {
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unmap(address, size);
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}
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bool VirtualMemory::Commit(uword addr, intptr_t size, bool executable) {
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ASSERT(Contains(addr));
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ASSERT(Contains(addr + size) || (addr + size == end()));
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int prot = PROT_READ | PROT_WRITE | (executable ? PROT_EXEC : 0);
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void* address = mmap(reinterpret_cast<void*>(addr), size, prot,
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MAP_PRIVATE | MAP_ANON | MAP_FIXED,
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-1, 0);
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if (address == MAP_FAILED) {
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return false;
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}
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return true;
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}
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} // namespace dart
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