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// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/globals.h"
#if defined(TARGET_OS_ANDROID)
#include "vm/virtual_memory.h"
#include <sys/mman.h> // NOLINT
#include <unistd.h> // NOLINT
#include "platform/assert.h"
#include "platform/utils.h"
namespace dart {
// standard MAP_FAILED causes "error: use of old-style cast" as it
// defines MAP_FAILED as ((void *) -1)
#undef MAP_FAILED
#define MAP_FAILED reinterpret_cast<void*>(-1)
uword VirtualMemory::page_size_ = 0;
void VirtualMemory::InitOnce() {
page_size_ = getpagesize();
}
VirtualMemory* VirtualMemory::Reserve(intptr_t size) {
// TODO(4408): use ashmem instead of anonymous memory.
void* address = mmap(NULL, size, PROT_NONE,
MAP_PRIVATE | MAP_ANON | MAP_NORESERVE,
-1, 0);
if (address == MAP_FAILED) {
return NULL;
}
MemoryRegion region(address, size);
return new VirtualMemory(region, NULL);
}
static void unmap(void* address, intptr_t size) {
if (size == 0) {
return;
}
if (munmap(address, size) != 0) {
FATAL("munmap failed\n");
}
}
VirtualMemory::~VirtualMemory() {
unmap(address(), size());
}
void VirtualMemory::FreeSubSegment(void* address, intptr_t size) {
unmap(address, size);
}
bool VirtualMemory::Commit(uword addr, intptr_t size, bool executable) {
ASSERT(Contains(addr));
ASSERT(Contains(addr + size) || (addr + size == end()));
int prot = PROT_READ | PROT_WRITE | (executable ? PROT_EXEC : 0);
void* address = mmap(reinterpret_cast<void*>(addr), size, prot,
MAP_PRIVATE | MAP_ANON | MAP_FIXED,
-1, 0);
if (address == MAP_FAILED) {
return false;
}
return true;
}
bool VirtualMemory::Protect(Protection mode) {
int prot = 0;
switch (mode) {
case kNoAccess:
prot = PROT_NONE;
break;
case kReadOnly:
prot = PROT_READ;
break;
case kReadWrite:
prot = PROT_READ | PROT_WRITE;
break;
case kReadExecute:
prot = PROT_READ | PROT_EXEC;
break;
case kReadWriteExecute:
prot = PROT_READ | PROT_WRITE | PROT_EXEC;
break;
}
return (mprotect(address(), size(), prot) == 0);
}
} // namespace dart
#endif // defined(TARGET_OS_ANDROID)