1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
// 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 "src/assembler.h"
namespace v8 {
namespace internal {
class TestingAssemblerBuffer : public AssemblerBuffer {
public:
TestingAssemblerBuffer(size_t requested, void* address) {
size_t page_size = v8::internal::AllocatePageSize();
size_t alloc_size = RoundUp(requested, page_size);
CHECK_GE(kMaxInt, alloc_size);
size_ = static_cast<int>(alloc_size);
buffer_ = static_cast<byte*>(AllocatePages(GetPlatformPageAllocator(),
address, alloc_size, page_size,
v8::PageAllocator::kReadWrite));
CHECK_NOT_NULL(buffer_);
}
~TestingAssemblerBuffer() {
CHECK(FreePages(GetPlatformPageAllocator(), buffer_, size_));
}
byte* start() const override { return buffer_; }
int size() const override { return size_; }
std::unique_ptr<AssemblerBuffer> Grow(int new_size) override {
FATAL("Cannot grow TestingAssemblerBuffer");
}
std::unique_ptr<AssemblerBuffer> CreateView() const {
return ExternalAssemblerBuffer(buffer_, 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
Assembler::FlushICache(buffer_, size_);
bool result = SetPermissions(GetPlatformPageAllocator(), buffer_, size_,
v8::PageAllocator::kReadExecute);
CHECK(result);
}
void MakeWritable() {
bool result = SetPermissions(GetPlatformPageAllocator(), buffer_, size_,
v8::PageAllocator::kReadWrite);
CHECK(result);
}
// TODO(wasm): Only needed for the "test-jump-table-assembler.cc" tests.
void MakeWritableAndExecutable() {
bool result = SetPermissions(GetPlatformPageAllocator(), buffer_, size_,
v8::PageAllocator::kReadWriteExecute);
CHECK(result);
}
private:
byte* buffer_;
int size_;
};
static inline std::unique_ptr<TestingAssemblerBuffer> AllocateAssemblerBuffer(
size_t requested = v8::internal::AssemblerBase::kMinimalBufferSize,
void* address = nullptr) {
return base::make_unique<TestingAssemblerBuffer>(requested, address);
}
} // namespace internal
} // namespace v8
#endif // V8_TEST_COMMON_ASSEMBLER_TESTER_H_
|
