mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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123 lines
5.0 KiB
C++
123 lines
5.0 KiB
C++
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// Copyright (c) 2021 Shiyu Liu
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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 "source/fuzz/fuzzer_pass_wrap_vector_synonym.h"
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#include "source/fuzz/fuzzer_context.h"
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/transformation_composite_construct.h"
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#include "source/fuzz/transformation_wrap_vector_synonym.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassWrapVectorSynonym::FuzzerPassWrapVectorSynonym(
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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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void FuzzerPassWrapVectorSynonym::Apply() {
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ForEachInstructionWithInstructionDescriptor(
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[this](opt::Function* /*unused*/, opt::BasicBlock* /*unused*/,
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opt::BasicBlock::iterator instruction_iterator,
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const protobufs::InstructionDescriptor& instruction_descriptor)
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-> void {
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// Randomly decide whether to wrap it to a vector operation.
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfWrappingVectorSynonym())) {
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return;
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}
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// The transformation is not applicable if the instruction has missing
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// result id, type id, or is not supported type.
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if (!TransformationWrapVectorSynonym::IsInstructionSupported(
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GetIRContext(), *instruction_iterator)) {
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return;
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}
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// The transformation will not be applicable if the id of the scalar
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// operation is irrelevant.
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if (GetTransformationContext()->GetFactManager()->IdIsIrrelevant(
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instruction_iterator->result_id())) {
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return;
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}
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// It must be valid to insert an OpCompositeConstruct instruction
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// before |instruction_iterator|.
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if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(
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SpvOpCompositeConstruct, instruction_iterator)) {
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return;
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}
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// Get the scalar type represented by the targeted instruction id.
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uint32_t operand_type_id = instruction_iterator->type_id();
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// Get a random vector size from 2 to 4.
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uint32_t vector_size = GetFuzzerContext()->GetWidthOfWrappingVector();
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// Randomly choose a position that target ids should be placed at.
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// The position is in range [0, n - 1], where n is the size of the
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// vector.
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uint32_t position =
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GetFuzzerContext()->GetRandomIndexForWrappingVector(vector_size);
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// Target ids are the two scalar ids from the original instruction.
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uint32_t target_id1 = instruction_iterator->GetSingleWordInOperand(0);
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uint32_t target_id2 = instruction_iterator->GetSingleWordInOperand(1);
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// Stores the ids of scalar constants.
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std::vector<uint32_t> vec1_components;
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std::vector<uint32_t> vec2_components;
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// Populate components based on vector type and size.
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for (uint32_t i = 0; i < vector_size; ++i) {
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if (i == position) {
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vec1_components.emplace_back(target_id1);
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vec2_components.emplace_back(target_id2);
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} else {
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vec1_components.emplace_back(
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FindOrCreateZeroConstant(operand_type_id, true));
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vec2_components.emplace_back(
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FindOrCreateZeroConstant(operand_type_id, true));
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}
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}
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// Add two OpCompositeConstruct to the module with result id returned.
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// Add the first OpCompositeConstruct that wraps the id of the first
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// operand.
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uint32_t result_id1 = GetFuzzerContext()->GetFreshId();
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ApplyTransformation(TransformationCompositeConstruct(
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operand_type_id, vec1_components, instruction_descriptor,
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result_id1));
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// Add the second OpCompositeConstruct that wraps the id of the second
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// operand.
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uint32_t result_id2 = GetFuzzerContext()->GetFreshId();
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ApplyTransformation(TransformationCompositeConstruct(
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operand_type_id, vec2_components, instruction_descriptor,
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result_id2));
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// Apply transformation to do vector operation and add synonym between
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// the result vector id and the id of the original instruction.
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ApplyTransformation(TransformationWrapVectorSynonym(
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instruction_iterator->result_id(), result_id1, result_id2,
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GetFuzzerContext()->GetFreshId(), position));
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});
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}
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} // namespace fuzz
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} // namespace spvtools
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