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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_replace_parameter_with_global.h"
#include <numeric>
#include <vector>
#include "source/fuzz/fuzzer_context.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/transformation_replace_parameter_with_global.h"
namespace spvtools {
namespace fuzz {
FuzzerPassReplaceParameterWithGlobal::FuzzerPassReplaceParameterWithGlobal(
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 FuzzerPassReplaceParameterWithGlobal::Apply() {
for (const auto& function : *GetIRContext()->module()) {
if (fuzzerutil::FunctionIsEntryPoint(GetIRContext(),
function.result_id())) {
continue;
}
if (!GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfReplacingParametersWithGlobals())) {
continue;
}
auto params =
fuzzerutil::GetParameters(GetIRContext(), function.result_id());
// Make sure at least one parameter can be replaced. Also checks that the
// function has at least one parameter.
if (std::none_of(params.begin(), params.end(),
[this](const opt::Instruction* param) {
return TransformationReplaceParameterWithGlobal::
IsParameterTypeSupported(GetIRContext(),
param->type_id());
})) {
continue;
}
// Select id of a parameter to replace.
const opt::Instruction* replaced_param;
uint32_t param_type_id;
do {
replaced_param = GetFuzzerContext()->RemoveAtRandomIndex(¶ms);
param_type_id = replaced_param->type_id();
assert(param_type_id && "Parameter has invalid type");
} while (
!TransformationReplaceParameterWithGlobal::IsParameterTypeSupported(
GetIRContext(), param_type_id));
assert(replaced_param && "Unable to find a parameter to replace");
// Make sure type id for the global variable exists in the module.
FindOrCreatePointerType(replaced_param->type_id(),
spv::StorageClass::Private);
// Make sure initializer for the global variable exists in the module.
FindOrCreateZeroConstant(replaced_param->type_id(), false);
ApplyTransformation(TransformationReplaceParameterWithGlobal(
GetFuzzerContext()->GetFreshId(), replaced_param->result_id(),
GetFuzzerContext()->GetFreshId()));
}
}
} // namespace fuzz
} // namespace spvtools
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