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732ad99e47
PR-URL: https://github.com/nodejs/node/pull/37587 Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Myles Borins <myles.borins@gmail.com>
88 lines
3.0 KiB
C++
88 lines
3.0 KiB
C++
// Copyright 2018 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_TEST_COMMON_ASSEMBLER_TESTER_H_
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#define V8_TEST_COMMON_ASSEMBLER_TESTER_H_
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#include <memory>
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#include "src/codegen/assembler.h"
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#include "src/codegen/code-desc.h"
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namespace v8 {
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namespace internal {
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class TestingAssemblerBuffer : public AssemblerBuffer {
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public:
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TestingAssemblerBuffer(
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size_t requested, void* address,
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VirtualMemory::JitPermission jit_permission = VirtualMemory::kNoJit) {
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size_t page_size = v8::internal::AllocatePageSize();
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size_t alloc_size = RoundUp(requested, page_size);
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CHECK_GE(kMaxInt, alloc_size);
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reservation_ = VirtualMemory(GetPlatformPageAllocator(), alloc_size,
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address, page_size, jit_permission);
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CHECK(reservation_.IsReserved());
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MakeWritable();
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}
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~TestingAssemblerBuffer() { reservation_.Free(); }
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byte* start() const override {
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return reinterpret_cast<byte*>(reservation_.address());
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}
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int size() const override { return static_cast<int>(reservation_.size()); }
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std::unique_ptr<AssemblerBuffer> Grow(int new_size) override {
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FATAL("Cannot grow TestingAssemblerBuffer");
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}
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std::unique_ptr<AssemblerBuffer> CreateView() const {
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return ExternalAssemblerBuffer(start(), size());
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}
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void MakeExecutable() {
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// Flush the instruction cache as part of making the buffer executable.
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// Note: we do this before setting permissions to ReadExecute because on
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// some older ARM kernels there is a bug which causes an access error on
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// cache flush instructions to trigger access error on non-writable memory.
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// See https://bugs.chromium.org/p/v8/issues/detail?id=8157
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FlushInstructionCache(start(), size());
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bool result = SetPermissions(GetPlatformPageAllocator(), start(), size(),
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v8::PageAllocator::kReadExecute);
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CHECK(result);
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}
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void MakeWritable() {
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bool result = SetPermissions(GetPlatformPageAllocator(), start(), size(),
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v8::PageAllocator::kReadWrite);
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CHECK(result);
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}
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// TODO(wasm): Only needed for the "test-jump-table-assembler.cc" tests.
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void MakeWritableAndExecutable() {
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bool result = SetPermissions(GetPlatformPageAllocator(), start(), size(),
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v8::PageAllocator::kReadWriteExecute);
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CHECK(result);
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}
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private:
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VirtualMemory reservation_;
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};
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static inline std::unique_ptr<TestingAssemblerBuffer> AllocateAssemblerBuffer(
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size_t requested = v8::internal::AssemblerBase::kDefaultBufferSize,
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void* address = nullptr,
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VirtualMemory::JitPermission jit_permission = VirtualMemory::kNoJit) {
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return std::make_unique<TestingAssemblerBuffer>(requested, address,
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jit_permission);
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}
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} // namespace internal
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} // namespace v8
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#endif // V8_TEST_COMMON_ASSEMBLER_TESTER_H_
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