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9b4bf7de6c
PR-URL: https://github.com/nodejs/node/pull/23423 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Myles Borins <myles.borins@gmail.com>
54 lines
1.9 KiB
C++
54 lines
1.9 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 "src/assembler.h"
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namespace v8 {
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namespace internal {
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static inline uint8_t* AllocateAssemblerBuffer(
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size_t* allocated,
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size_t requested = v8::internal::AssemblerBase::kMinimalBufferSize,
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void* address = nullptr) {
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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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void* result = v8::internal::AllocatePages(
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GetPlatformPageAllocator(), address, alloc_size, page_size,
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v8::PageAllocator::kReadWriteExecute);
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CHECK(result);
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*allocated = alloc_size;
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return static_cast<uint8_t*>(result);
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}
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static inline void MakeAssemblerBufferExecutable(uint8_t* buffer,
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size_t allocated) {
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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 Arm64 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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Assembler::FlushICache(buffer, allocated);
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bool result =
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v8::internal::SetPermissions(GetPlatformPageAllocator(), buffer,
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allocated, v8::PageAllocator::kReadExecute);
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CHECK(result);
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}
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static inline void MakeAssemblerBufferWritable(uint8_t* buffer,
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size_t allocated) {
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bool result =
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v8::internal::SetPermissions(GetPlatformPageAllocator(), buffer,
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allocated, v8::PageAllocator::kReadWrite);
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CHECK(result);
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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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