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/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_RUNTIME_JIT_JIT_SCOPED_CODE_CACHE_WRITE_H_
#define ART_RUNTIME_JIT_JIT_SCOPED_CODE_CACHE_WRITE_H_
#include <sys/mman.h>
#include "base/systrace.h"
#include "base/utils.h" // For CheckedCall
namespace art {
namespace jit {
class JitMemoryRegion;
static constexpr int kProtR = PROT_READ;
static constexpr int kProtRW = PROT_READ | PROT_WRITE;
static constexpr int kProtRWX = PROT_READ | PROT_WRITE | PROT_EXEC;
static constexpr int kProtRX = PROT_READ | PROT_EXEC;
// Helper for toggling JIT memory R <-> RW.
class ScopedCodeCacheWrite : ScopedTrace {
public:
explicit ScopedCodeCacheWrite(const JitMemoryRegion& region)
: ScopedTrace("ScopedCodeCacheWrite"),
region_(region) {
ScopedTrace trace("mprotect all");
const MemMap* const updatable_pages = region.GetUpdatableCodeMapping();
if (updatable_pages != nullptr) {
int prot = region.HasDualCodeMapping() ? kProtRW : kProtRWX;
CheckedCall(mprotect, "Cache +W", updatable_pages->Begin(), updatable_pages->Size(), prot);
}
}
~ScopedCodeCacheWrite() {
ScopedTrace trace("mprotect code");
const MemMap* const updatable_pages = region_.GetUpdatableCodeMapping();
if (updatable_pages != nullptr) {
int prot = region_.HasDualCodeMapping() ? kProtR : kProtRX;
CheckedCall(mprotect, "Cache -W", updatable_pages->Begin(), updatable_pages->Size(), prot);
}
}
private:
const JitMemoryRegion& region_;
DISALLOW_COPY_AND_ASSIGN(ScopedCodeCacheWrite);
};
} // namespace jit
} // namespace art
#endif // ART_RUNTIME_JIT_JIT_SCOPED_CODE_CACHE_WRITE_H_
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