blob: 26bb70fce70d475a7ee9930541f252a5d3fff477 [file] [log] [blame]
// 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);
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::ValueTypes::ValueTypeFor(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::ValueTypes::ValueTypeFor(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.
return isolate->wasm_engine()->NewNativeModule(
isolate, i::wasm::kAllWasmFeatures, code_size, false, std::move(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::kV8MaxWasmFunctionMultiReturns) 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, new (&zone) 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(ArrayVector("testing"), &zone, Code::STUB);
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, new (&zone) 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(ArrayVector("wrapper"), &zone,
Code::STUB);
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