Srdjan Mitrovic
4465fc3492
BUG= R=asiva@google.com Review URL: https://codereview.chromium.org/1880233002 .
103 lines
2.6 KiB
C++
103 lines
2.6 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/globals.h"
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#if defined(TARGET_OS_WINDOWS)
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#include "vm/virtual_memory.h"
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#include "platform/assert.h"
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#include "vm/os.h"
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#include "vm/isolate.h"
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namespace dart {
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uword VirtualMemory::page_size_ = 0;
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void VirtualMemory::InitOnce() {
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SYSTEM_INFO info;
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GetSystemInfo(&info);
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page_size_ = info.dwPageSize;
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}
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VirtualMemory* VirtualMemory::ReserveInternal(intptr_t size) {
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void* address = VirtualAlloc(NULL, size, MEM_RESERVE, PAGE_NOACCESS);
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if (address == NULL) {
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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);
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}
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VirtualMemory::~VirtualMemory() {
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if (embedder_allocated() || (reserved_size_ == 0)) {
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return;
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}
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if (VirtualFree(address(), 0, MEM_RELEASE) == 0) {
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FATAL("VirtualFree failed");
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}
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}
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bool VirtualMemory::FreeSubSegment(void* address, intptr_t size) {
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// On Windows only the entire segment returned by VirtualAlloc
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// can be freed. Therefore we will have to waste these unused
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// virtual memory sub-segments.
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return false;
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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 = executable ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
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if (VirtualAlloc(reinterpret_cast<void*>(addr), size, MEM_COMMIT, prot) ==
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NULL) {
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return false;
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}
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return true;
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}
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bool VirtualMemory::Protect(void* address, intptr_t size, Protection mode) {
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ASSERT(Thread::Current()->IsMutatorThread() ||
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!Isolate::Current()->HasMutatorThread() ||
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Isolate::Current()->mutator_thread()->IsAtSafepoint());
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uword start_address = reinterpret_cast<uword>(address);
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uword end_address = start_address + size;
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uword page_address = Utils::RoundDown(start_address, PageSize());
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DWORD prot = 0;
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switch (mode) {
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case kNoAccess:
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prot = PAGE_NOACCESS;
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break;
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case kReadOnly:
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prot = PAGE_READONLY;
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break;
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case kReadWrite:
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prot = PAGE_READWRITE;
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break;
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case kReadExecute:
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prot = PAGE_EXECUTE_READ;
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break;
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case kReadWriteExecute:
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prot = PAGE_EXECUTE_READWRITE;
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break;
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}
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DWORD old_prot = 0;
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bool result = VirtualProtect(reinterpret_cast<void*>(page_address),
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end_address - page_address,
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prot,
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&old_prot);
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return result;
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}
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} // namespace dart
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#endif // defined(TARGET_OS_WINDOWS)
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