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// Copyright (c) 2020 Vasyl Teliman
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "source/fuzz/fuzzer_pass_add_parameters.h"
#include "source/fuzz/fuzzer_context.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
#include "source/fuzz/transformation_add_parameter.h"
namespace spvtools {
namespace fuzz {
FuzzerPassAddParameters::FuzzerPassAddParameters(
opt::IRContext* ir_context, TransformationContext* transformation_context,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations,
bool ignore_inapplicable_transformations)
: FuzzerPass(ir_context, transformation_context, fuzzer_context,
transformations, ignore_inapplicable_transformations) {}
void FuzzerPassAddParameters::Apply() {
// Compute type candidates for the new parameter.
std::vector<uint32_t> type_candidates;
for (const auto& type_inst : GetIRContext()->module()->GetTypes()) {
if (TransformationAddParameter::IsParameterTypeSupported(
GetIRContext(), type_inst->result_id())) {
type_candidates.push_back(type_inst->result_id());
}
}
if (type_candidates.empty()) {
// The module contains no suitable types to use in new parameters.
return;
}
// Iterate over all functions in the module.
for (const auto& function : *GetIRContext()->module()) {
// Skip all entry-point functions - we don't want to change those.
if (fuzzerutil::FunctionIsEntryPoint(GetIRContext(),
function.result_id())) {
continue;
}
if (GetNumberOfParameters(function) >=
GetFuzzerContext()->GetMaximumNumberOfFunctionParameters()) {
continue;
}
if (!GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfAddingParameters())) {
continue;
}
auto num_new_parameters =
GetFuzzerContext()->GetRandomNumberOfNewParameters(
GetNumberOfParameters(function));
for (uint32_t i = 0; i < num_new_parameters; ++i) {
auto current_type_id =
type_candidates[GetFuzzerContext()->RandomIndex(type_candidates)];
auto current_type =
GetIRContext()->get_type_mgr()->GetType(current_type_id);
std::map<uint32_t, uint32_t> call_parameter_ids;
// Consider the case when a pointer type was selected.
if (current_type->kind() == opt::analysis::Type::kPointer) {
auto storage_class = fuzzerutil::GetStorageClassFromPointerType(
GetIRContext(), current_type_id);
switch (storage_class) {
case spv::StorageClass::Function: {
// In every caller find or create a local variable that has the
// selected type.
for (auto* instr :
fuzzerutil::GetCallers(GetIRContext(), function.result_id())) {
auto block = GetIRContext()->get_instr_block(instr);
auto function_id = block->GetParent()->result_id();
uint32_t variable_id =
FindOrCreateLocalVariable(current_type_id, function_id, true);
call_parameter_ids[instr->result_id()] = variable_id;
}
} break;
case spv::StorageClass::Private:
case spv::StorageClass::Workgroup: {
// If there exists at least one caller, find or create a global
// variable that has the selected type.
std::vector<opt::Instruction*> callers =
fuzzerutil::GetCallers(GetIRContext(), function.result_id());
if (!callers.empty()) {
uint32_t variable_id =
FindOrCreateGlobalVariable(current_type_id, true);
for (auto* instr : callers) {
call_parameter_ids[instr->result_id()] = variable_id;
}
}
} break;
default:
break;
}
} else {
// If there exists at least one caller, find or create a zero constant
// that has the selected type.
std::vector<opt::Instruction*> callers =
fuzzerutil::GetCallers(GetIRContext(), function.result_id());
if (!callers.empty()) {
uint32_t constant_id =
FindOrCreateZeroConstant(current_type_id, true);
for (auto* instr :
fuzzerutil::GetCallers(GetIRContext(), function.result_id())) {
call_parameter_ids[instr->result_id()] = constant_id;
}
}
}
ApplyTransformation(TransformationAddParameter(
function.result_id(), GetFuzzerContext()->GetFreshId(),
current_type_id, std::move(call_parameter_ids),
GetFuzzerContext()->GetFreshId()));
}
}
}
uint32_t FuzzerPassAddParameters::GetNumberOfParameters(
const opt::Function& function) const {
const auto* type = GetIRContext()->get_type_mgr()->GetType(
function.DefInst().GetSingleWordInOperand(1));
assert(type && type->AsFunction());
return static_cast<uint32_t>(type->AsFunction()->param_types().size());
}
} // namespace fuzz
} // namespace spvtools
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