v8/test/fuzzer/multi-return.cc
Clemens Backes fa3cd68a3f [isolate][cleanup] Remove pointer to WasmEngine
The WasmEngine is shared across the whole process, so there is no need
to store it in every Isolate.
Instead, we can just get it from everywhere on any thread using
{wasm::GetWasmEngine()}, which is a simple read of a global.

R=jkummerow@chromium.org

Bug: v8:11879
Change-Id: I13afb8ca3d116aa14bfaec5a4bbd6d71faa9aa17
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2969825
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75265}
2021-06-21 09:09:25 +00:00

307 lines
11 KiB
C++

// 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 <cstddef>
#include <cstdint>
#include "src/codegen/machine-type.h"
#include "src/codegen/optimized-compilation-info.h"
#include "src/compiler/backend/instruction-selector.h"
#include "src/compiler/graph.h"
#include "src/compiler/linkage.h"
#include "src/compiler/node.h"
#include "src/compiler/operator.h"
#include "src/compiler/pipeline.h"
#include "src/compiler/raw-machine-assembler.h"
#include "src/compiler/wasm-compiler.h"
#include "src/execution/simulator.h"
#include "src/objects/objects-inl.h"
#include "src/objects/objects.h"
#include "src/wasm/wasm-engine.h"
#include "src/wasm/wasm-features.h"
#include "src/wasm/wasm-limits.h"
#include "src/wasm/wasm-objects-inl.h"
#include "src/wasm/wasm-objects.h"
#include "src/wasm/wasm-opcodes.h"
#include "src/zone/accounting-allocator.h"
#include "src/zone/zone.h"
#include "test/fuzzer/fuzzer-support.h"
namespace v8 {
namespace internal {
namespace compiler {
namespace fuzzer {
constexpr MachineType kTypes[] = {
// The first entry is just a placeholder, because '0' is a separator.
MachineType(),
#if !V8_TARGET_ARCH_32_BIT
MachineType::Int64(),
#endif
MachineType::Int32(), MachineType::Float32(), MachineType::Float64()};
static constexpr int kNumTypes = arraysize(kTypes);
class InputProvider {
public:
InputProvider(const uint8_t* data, size_t size)
: current_(data), end_(data + size) {}
size_t NumNonZeroBytes(size_t offset, int limit) {
DCHECK_LE(limit, std::numeric_limits<uint8_t>::max());
DCHECK_GE(current_ + offset, current_);
const uint8_t* p;
for (p = current_ + offset; p < end_; ++p) {
if (*p % limit == 0) break;
}
return p - current_ - offset;
}
int NextInt8(int limit) {
DCHECK_LE(limit, std::numeric_limits<uint8_t>::max());
if (current_ == end_) return 0;
uint8_t result = *current_;
current_++;
return static_cast<int>(result) % limit;
}
int NextInt32(int limit) {
if (current_ + sizeof(uint32_t) > end_) return 0;
int result =
base::ReadLittleEndianValue<int>(reinterpret_cast<Address>(current_));
current_ += sizeof(uint32_t);
return result % limit;
}
private:
const uint8_t* current_;
const uint8_t* end_;
};
MachineType RandomType(InputProvider* input) {
return kTypes[input->NextInt8(kNumTypes)];
}
int index(MachineType type) { return static_cast<int>(type.representation()); }
Node* Constant(RawMachineAssembler* m, MachineType type, int value) {
switch (type.representation()) {
case MachineRepresentation::kWord32:
return m->Int32Constant(static_cast<int32_t>(value));
case MachineRepresentation::kWord64:
return m->Int64Constant(static_cast<int64_t>(value));
case MachineRepresentation::kFloat32:
return m->Float32Constant(static_cast<float>(value));
case MachineRepresentation::kFloat64:
return m->Float64Constant(static_cast<double>(value));
default:
UNREACHABLE();
}
}
Node* ToInt32(RawMachineAssembler* m, MachineType type, Node* a) {
switch (type.representation()) {
case MachineRepresentation::kWord32:
return a;
case MachineRepresentation::kWord64:
return m->TruncateInt64ToInt32(a);
case MachineRepresentation::kFloat32:
return m->TruncateFloat32ToInt32(a, TruncateKind::kArchitectureDefault);
case MachineRepresentation::kFloat64:
return m->RoundFloat64ToInt32(a);
default:
UNREACHABLE();
}
}
CallDescriptor* CreateRandomCallDescriptor(Zone* zone, size_t return_count,
size_t param_count,
InputProvider* input) {
wasm::FunctionSig::Builder builder(zone, return_count, param_count);
for (size_t i = 0; i < param_count; i++) {
MachineType type = RandomType(input);
builder.AddParam(wasm::ValueType::For(type));
}
// Read the end byte of the parameters.
input->NextInt8(1);
for (size_t i = 0; i < return_count; i++) {
MachineType type = RandomType(input);
builder.AddReturn(wasm::ValueType::For(type));
}
return compiler::GetWasmCallDescriptor(zone, builder.Build());
}
std::shared_ptr<wasm::NativeModule> AllocateNativeModule(i::Isolate* isolate,
size_t code_size) {
std::shared_ptr<wasm::WasmModule> module(new wasm::WasmModule);
module->num_declared_functions = 1;
// We have to add the code object to a NativeModule, because the
// WasmCallDescriptor assumes that code is on the native heap and not
// within a code object.
auto native_module = wasm::GetWasmEngine()->NewNativeModule(
isolate, i::wasm::WasmFeatures::All(), std::move(module), code_size);
native_module->SetWireBytes({});
return native_module;
}
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
v8_fuzzer::FuzzerSupport* support = v8_fuzzer::FuzzerSupport::Get();
v8::Isolate* isolate = support->GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<Isolate*>(isolate);
v8::Isolate::Scope isolate_scope(isolate);
v8::HandleScope handle_scope(isolate);
v8::Context::Scope context_scope(support->GetContext());
v8::TryCatch try_catch(isolate);
v8::internal::AccountingAllocator allocator;
Zone zone(&allocator, ZONE_NAME);
InputProvider input(data, size);
// Create randomized descriptor.
size_t param_count = input.NumNonZeroBytes(0, kNumTypes);
if (param_count > Code::kMaxArguments) return 0;
size_t return_count = input.NumNonZeroBytes(param_count + 1, kNumTypes);
if (return_count > wasm::kV8MaxWasmFunctionReturns) return 0;
CallDescriptor* desc =
CreateRandomCallDescriptor(&zone, return_count, param_count, &input);
if (FLAG_wasm_fuzzer_gen_test) {
// Print some debugging output which describes the produced signature.
printf("[");
for (size_t j = 0; j < param_count; ++j) {
// Parameter 0 is the WasmContext.
printf(" %s", MachineReprToString(
desc->GetParameterType(j + 1).representation()));
}
printf(" ] -> [");
for (size_t j = 0; j < desc->ReturnCount(); ++j) {
printf(" %s",
MachineReprToString(desc->GetReturnType(j).representation()));
}
printf(" ]\n\n");
}
// Count parameters of each type.
constexpr size_t kNumMachineRepresentations =
static_cast<size_t>(MachineRepresentation::kLastRepresentation) + 1;
// Trivial hash table for the number of occurrences of parameter types. The
// MachineRepresentation of the parameter types is used as hash code.
int counts[kNumMachineRepresentations] = {0};
for (size_t i = 0; i < param_count; ++i) {
// Parameter 0 is the WasmContext.
++counts[index(desc->GetParameterType(i + 1))];
}
// Generate random inputs.
std::unique_ptr<int[]> inputs(new int[param_count]);
std::unique_ptr<int[]> outputs(new int[desc->ReturnCount()]);
for (size_t i = 0; i < param_count; ++i) {
inputs[i] = input.NextInt32(10000);
}
RawMachineAssembler callee(
i_isolate, zone.New<Graph>(&zone), desc,
MachineType::PointerRepresentation(),
InstructionSelector::SupportedMachineOperatorFlags());
// Generate callee, returning random picks of its parameters.
std::unique_ptr<Node* []> params(new Node*[desc->ParameterCount() + 2]);
// The first input of a return is the number of stack slots that should be
// popped before returning.
std::unique_ptr<Node* []> returns(new Node*[desc->ReturnCount() + 1]);
for (size_t i = 0; i < param_count; ++i) {
// Parameter(0) is the WasmContext.
params[i] = callee.Parameter(i + 1);
}
for (size_t i = 0; i < desc->ReturnCount(); ++i) {
MachineType type = desc->GetReturnType(i);
// Find a random same-type parameter to return. Use a constant if none.
if (counts[index(type)] == 0) {
returns[i] = Constant(&callee, type, 42);
outputs[i] = 42;
} else {
int n = input.NextInt32(counts[index(type)]);
int k = 0;
while (desc->GetParameterType(k + 1) != desc->GetReturnType(i) ||
--n > 0) {
++k;
}
returns[i] = params[k];
outputs[i] = inputs[k];
}
}
callee.Return(static_cast<int>(desc->ReturnCount()), returns.get());
OptimizedCompilationInfo info(base::ArrayVector("testing"), &zone,
CodeKind::FOR_TESTING);
Handle<Code> code =
Pipeline::GenerateCodeForTesting(&info, i_isolate, desc, callee.graph(),
AssemblerOptions::Default(i_isolate),
callee.ExportForTest())
.ToHandleChecked();
std::shared_ptr<wasm::NativeModule> module =
AllocateNativeModule(i_isolate, code->raw_instruction_size());
wasm::WasmCodeRefScope wasm_code_ref_scope;
byte* code_start = module->AddCodeForTesting(code)->instructions().begin();
// Generate wrapper.
int expect = 0;
MachineSignature::Builder sig_builder(&zone, 1, 0);
sig_builder.AddReturn(MachineType::Int32());
CallDescriptor* wrapper_desc =
Linkage::GetSimplifiedCDescriptor(&zone, sig_builder.Build());
RawMachineAssembler caller(
i_isolate, zone.New<Graph>(&zone), wrapper_desc,
MachineType::PointerRepresentation(),
InstructionSelector::SupportedMachineOperatorFlags());
params[0] = caller.PointerConstant(code_start);
// WasmContext dummy.
params[1] = caller.PointerConstant(nullptr);
for (size_t i = 0; i < param_count; ++i) {
params[i + 2] = Constant(&caller, desc->GetParameterType(i + 1), inputs[i]);
}
Node* call = caller.AddNode(caller.common()->Call(desc),
static_cast<int>(param_count + 2), params.get());
Node* ret = Constant(&caller, MachineType::Int32(), 0);
for (size_t i = 0; i < desc->ReturnCount(); ++i) {
// Skip roughly one third of the outputs.
if (input.NextInt8(3) == 0) continue;
Node* ret_i = (desc->ReturnCount() == 1)
? call
: caller.AddNode(caller.common()->Projection(i), call);
ret = caller.Int32Add(ret, ToInt32(&caller, desc->GetReturnType(i), ret_i));
expect += outputs[i];
}
caller.Return(ret);
// Call the wrapper.
OptimizedCompilationInfo wrapper_info(base::ArrayVector("wrapper"), &zone,
CodeKind::FOR_TESTING);
Handle<Code> wrapper_code =
Pipeline::GenerateCodeForTesting(
&wrapper_info, i_isolate, wrapper_desc, caller.graph(),
AssemblerOptions::Default(i_isolate), caller.ExportForTest())
.ToHandleChecked();
auto fn = GeneratedCode<int32_t>::FromCode(*wrapper_code);
int result = fn.Call();
CHECK_EQ(expect, result);
return 0;
}
} // namespace fuzzer
} // namespace compiler
} // namespace internal
} // namespace v8