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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.
#include <memory>
#include "include/v8.h"
#include "src/codegen/code-desc.h"
#include "src/execution/isolate.h"
#include "src/handles/handles-inl.h"
#include "test/cctest/cctest.h"
namespace v8 {
namespace internal {
namespace test_factory {
namespace {
// This needs to be large enough to create a new nosnap Isolate, but smaller
// than kMaximalCodeRangeSize so we can recover from the OOM.
constexpr int kInstructionSize = 100 * MB;
STATIC_ASSERT(kInstructionSize < kMaximalCodeRangeSize ||
!kPlatformRequiresCodeRange);
size_t NearHeapLimitCallback(void* raw_bool, size_t current_heap_limit,
size_t initial_heap_limit) {
bool* oom_triggered = static_cast<bool*>(raw_bool);
*oom_triggered = true;
return kInstructionSize * 2;
}
class SetupIsolateWithSmallHeap {
public:
SetupIsolateWithSmallHeap() {
FLAG_max_old_space_size = kInstructionSize / MB / 2; // In MB.
v8::Isolate::CreateParams create_params;
create_params.array_buffer_allocator = CcTest::array_buffer_allocator();
isolate_ = reinterpret_cast<Isolate*>(v8::Isolate::New(create_params));
isolate_->heap()->AddNearHeapLimitCallback(NearHeapLimitCallback,
&oom_triggered_);
}
~SetupIsolateWithSmallHeap() {
reinterpret_cast<v8::Isolate*>(isolate_)->Dispose();
}
Isolate* isolate() { return isolate_; }
bool oom_triggered() const { return oom_triggered_; }
private:
Isolate* isolate_;
bool oom_triggered_ = false;
};
} // namespace
TEST(Factory_CodeBuilder) {
Isolate* isolate = CcTest::i_isolate();
HandleScope scope(isolate);
// Create a big function that ends up in CODE_LO_SPACE.
const int instruction_size = kMaxRegularHeapObjectSize + 1;
std::unique_ptr<byte[]> instructions(new byte[instruction_size]);
CodeDesc desc;
desc.buffer = instructions.get();
desc.buffer_size = instruction_size;
desc.instr_size = instruction_size;
desc.reloc_size = 0;
desc.constant_pool_size = 0;
desc.unwinding_info = nullptr;
desc.unwinding_info_size = 0;
desc.origin = nullptr;
Handle<Code> code =
Factory::CodeBuilder(isolate, desc, CodeKind::WASM_FUNCTION).Build();
CHECK(isolate->heap()->InSpace(*code, CODE_LO_SPACE));
#if VERIFY_HEAP
code->ObjectVerify(isolate);
#endif
}
UNINITIALIZED_TEST(Factory_CodeBuilder_BuildOOM) {
SetupIsolateWithSmallHeap isolate_scope;
HandleScope scope(isolate_scope.isolate());
std::unique_ptr<byte[]> instructions(new byte[kInstructionSize]);
CodeDesc desc;
desc.instr_size = kInstructionSize;
desc.buffer = instructions.get();
const Handle<Code> code = Factory::CodeBuilder(isolate_scope.isolate(), desc,
CodeKind::WASM_FUNCTION)
.Build();
CHECK(!code.is_null());
CHECK(isolate_scope.oom_triggered());
}
UNINITIALIZED_TEST(Factory_CodeBuilder_TryBuildOOM) {
SetupIsolateWithSmallHeap isolate_scope;
HandleScope scope(isolate_scope.isolate());
std::unique_ptr<byte[]> instructions(new byte[kInstructionSize]);
CodeDesc desc;
desc.instr_size = kInstructionSize;
desc.buffer = instructions.get();
const MaybeHandle<Code> code =
Factory::CodeBuilder(isolate_scope.isolate(), desc,
CodeKind::WASM_FUNCTION)
.TryBuild();
CHECK(code.is_null());
CHECK(!isolate_scope.oom_triggered());
}
} // namespace test_factory
} // namespace internal
} // namespace v8
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