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// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_TEST_COMMON_ASSEMBLER_TESTER_H_
#define V8_TEST_COMMON_ASSEMBLER_TESTER_H_
#include <memory>
#include "src/codegen/assembler.h"
#include "src/codegen/code-desc.h"
namespace v8 {
namespace internal {
class TestingAssemblerBuffer : public AssemblerBuffer {
public:
TestingAssemblerBuffer(
size_t requested, void* address,
VirtualMemory::JitPermission jit_permission = VirtualMemory::kNoJit) {
size_t page_size = v8::internal::AllocatePageSize();
size_t alloc_size = RoundUp(requested, page_size);
CHECK_GE(kMaxInt, alloc_size);
reservation_ = VirtualMemory(GetPlatformPageAllocator(), alloc_size,
address, page_size, jit_permission);
CHECK(reservation_.IsReserved());
MakeWritable();
}
~TestingAssemblerBuffer() { reservation_.Free(); }
byte* start() const override {
return reinterpret_cast<byte*>(reservation_.address());
}
int size() const override { return static_cast<int>(reservation_.size()); }
std::unique_ptr<AssemblerBuffer> Grow(int new_size) override {
FATAL("Cannot grow TestingAssemblerBuffer");
}
std::unique_ptr<AssemblerBuffer> CreateView() const {
return ExternalAssemblerBuffer(start(), size());
}
void MakeExecutable() {
// Flush the instruction cache as part of making the buffer executable.
// Note: we do this before setting permissions to ReadExecute because on
// some older ARM kernels there is a bug which causes an access error on
// cache flush instructions to trigger access error on non-writable memory.
// See https://bugs.chromium.org/p/v8/issues/detail?id=8157
FlushInstructionCache(start(), size());
bool result = SetPermissions(GetPlatformPageAllocator(), start(), size(),
v8::PageAllocator::kReadExecute);
CHECK(result);
}
void MakeWritable() {
bool result = SetPermissions(GetPlatformPageAllocator(), start(), size(),
v8::PageAllocator::kReadWrite);
CHECK(result);
}
// TODO(wasm): Only needed for the "test-jump-table-assembler.cc" tests.
void MakeWritableAndExecutable() {
bool result = SetPermissions(GetPlatformPageAllocator(), start(), size(),
v8::PageAllocator::kReadWriteExecute);
CHECK(result);
}
private:
VirtualMemory reservation_;
};
static inline std::unique_ptr<TestingAssemblerBuffer> AllocateAssemblerBuffer(
size_t requested = v8::internal::AssemblerBase::kDefaultBufferSize,
void* address = nullptr,
VirtualMemory::JitPermission jit_permission = VirtualMemory::kNoJit) {
return std::make_unique<TestingAssemblerBuffer>(requested, address,
jit_permission);
}
} // namespace internal
} // namespace v8
#endif // V8_TEST_COMMON_ASSEMBLER_TESTER_H_