Zachary Anderson
1393e84863
This CL assigns names to vmos formatted as "isolate space type" where isolate is the name of the isolate, space is "oldspace" or "newspace", and type is "code" or "data". R=asiva@google.com Review-Url: https://codereview.chromium.org/2929203002 .
105 lines
2.7 KiB
C++
105 lines
2.7 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(HOST_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 (!vm_owns_region() || (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(int32_t handle,
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void* address,
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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,
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intptr_t size,
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bool executable,
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const char* name) {
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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()->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, prot, &old_prot);
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return result;
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}
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} // namespace dart
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#endif // defined(HOST_OS_WINDOWS)
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