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https://github.com/KhronosGroup/SPIRV-Tools
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Some transformations (e.g. TransformationAddFunction) rely on running the validator to decide whether the transformation is applicable. A recent change allowed spirv-fuzz to take validator options, to cater for the case where a module should be considered valid under particular conditions. However, validation during the checking of transformations had no access to these validator options. This change introduced TransformationContext, which currently consists of a fact manager and a set of validator options, but could in the future have other fields corresponding to other objects that it is useful to have access to when applying transformations. Now, instead of checking and applying transformations in the context of a FactManager, a TransformationContext is used. This gives access to the fact manager as before, and also access to the validator options when they are needed.
83 lines
2.9 KiB
C++
83 lines
2.9 KiB
C++
// Copyright (c) 2020 Vasyl Teliman
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <numeric>
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#include <vector>
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#include "source/fuzz/fuzzer_context.h"
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#include "source/fuzz/fuzzer_pass_permute_function_parameters.h"
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/instruction_descriptor.h"
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#include "source/fuzz/transformation_permute_function_parameters.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassPermuteFunctionParameters::FuzzerPassPermuteFunctionParameters(
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opt::IRContext* ir_context, TransformationContext* transformation_context,
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FuzzerContext* fuzzer_context,
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protobufs::TransformationSequence* transformations)
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: FuzzerPass(ir_context, transformation_context, fuzzer_context,
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transformations) {}
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FuzzerPassPermuteFunctionParameters::~FuzzerPassPermuteFunctionParameters() =
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default;
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void FuzzerPassPermuteFunctionParameters::Apply() {
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for (const auto& function : *GetIRContext()->module()) {
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uint32_t function_id = function.result_id();
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// Skip the function if it is an entry point
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if (fuzzerutil::FunctionIsEntryPoint(GetIRContext(), function_id)) {
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continue;
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}
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfPermutingParameters())) {
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continue;
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}
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// Compute permutation for parameters
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auto* function_type =
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fuzzerutil::GetFunctionType(GetIRContext(), &function);
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assert(function_type && "Function type is null");
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// Don't take return type into account
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uint32_t arg_size = function_type->NumInOperands() - 1;
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// Create a vector, fill it with [0, n-1] values and shuffle it
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std::vector<uint32_t> permutation(arg_size);
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std::iota(permutation.begin(), permutation.end(), 0);
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GetFuzzerContext()->Shuffle(&permutation);
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// Create a new OpFunctionType instruction with permuted arguments
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// if needed
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auto result_type_id = function_type->GetSingleWordInOperand(0);
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std::vector<uint32_t> argument_ids;
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for (auto index : permutation) {
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// +1 to take function's return type into account
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argument_ids.push_back(function_type->GetSingleWordInOperand(index + 1));
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}
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// Apply our transformation
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ApplyTransformation(TransformationPermuteFunctionParameters(
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function_id, FindOrCreateFunctionType(result_type_id, argument_ids),
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permutation));
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}
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}
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} // namespace fuzz
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} // namespace spvtools
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