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1 : // Copyright 2018 the V8 project authors. All rights reserved.
2 : // Use of this source code is governed by a BSD-style license that can be
3 : // found in the LICENSE file.
4 :
5 : #ifndef V8_TEST_COMMON_ASSEMBLER_TESTER_H_
6 : #define V8_TEST_COMMON_ASSEMBLER_TESTER_H_
7 :
8 : #include "src/assembler.h"
9 : #include "src/code-desc.h"
10 :
11 : namespace v8 {
12 : namespace internal {
13 :
14 : class TestingAssemblerBuffer : public AssemblerBuffer {
15 : public:
16 386 : TestingAssemblerBuffer(size_t requested, void* address) {
17 193 : size_t page_size = v8::internal::AllocatePageSize();
18 193 : size_t alloc_size = RoundUp(requested, page_size);
19 193 : CHECK_GE(kMaxInt, alloc_size);
20 193 : size_ = static_cast<int>(alloc_size);
21 193 : buffer_ = static_cast<byte*>(AllocatePages(GetPlatformPageAllocator(),
22 : address, alloc_size, page_size,
23 193 : v8::PageAllocator::kReadWrite));
24 193 : CHECK_NOT_NULL(buffer_);
25 193 : }
26 :
27 579 : ~TestingAssemblerBuffer() {
28 193 : CHECK(FreePages(GetPlatformPageAllocator(), buffer_, size_));
29 386 : }
30 :
31 487 : byte* start() const override { return buffer_; }
32 :
33 300 : int size() const override { return size_; }
34 :
35 0 : std::unique_ptr<AssemblerBuffer> Grow(int new_size) override {
36 0 : FATAL("Cannot grow TestingAssemblerBuffer");
37 : }
38 :
39 : std::unique_ptr<AssemblerBuffer> CreateView() const {
40 249 : return ExternalAssemblerBuffer(buffer_, size_);
41 : }
42 :
43 131 : void MakeExecutable() {
44 : // Flush the instruction cache as part of making the buffer executable.
45 : // Note: we do this before setting permissions to ReadExecute because on
46 : // some older ARM kernels there is a bug which causes an access error on
47 : // cache flush instructions to trigger access error on non-writable memory.
48 : // See https://bugs.chromium.org/p/v8/issues/detail?id=8157
49 131 : FlushInstructionCache(buffer_, size_);
50 :
51 131 : bool result = SetPermissions(GetPlatformPageAllocator(), buffer_, size_,
52 131 : v8::PageAllocator::kReadExecute);
53 131 : CHECK(result);
54 131 : }
55 :
56 : void MakeWritable() {
57 : bool result = SetPermissions(GetPlatformPageAllocator(), buffer_, size_,
58 : v8::PageAllocator::kReadWrite);
59 : CHECK(result);
60 : }
61 :
62 : // TODO(wasm): Only needed for the "test-jump-table-assembler.cc" tests.
63 4 : void MakeWritableAndExecutable() {
64 4 : bool result = SetPermissions(GetPlatformPageAllocator(), buffer_, size_,
65 4 : v8::PageAllocator::kReadWriteExecute);
66 4 : CHECK(result);
67 4 : }
68 :
69 : private:
70 : byte* buffer_;
71 : int size_;
72 : };
73 :
74 : static inline std::unique_ptr<TestingAssemblerBuffer> AllocateAssemblerBuffer(
75 : size_t requested = v8::internal::AssemblerBase::kMinimalBufferSize,
76 : void* address = nullptr) {
77 193 : return base::make_unique<TestingAssemblerBuffer>(requested, address);
78 : }
79 :
80 : } // namespace internal
81 : } // namespace v8
82 :
83 : #endif // V8_TEST_COMMON_ASSEMBLER_TESTER_H_
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