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https://github.com/KhronosGroup/SPIRV-Tools
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4fcdc58946
There was a lot of code in the codebase that would get the dominator analysis for a function and then use it to check whether a block is reachable. In the fuzzer, a utility method had been introduced to make this more concise, but it was not being used consistently. This change moves the utility method to IRContext, so that it can be used throughout the codebase, and refactors all existing checks for block reachability to use the utility method.
65 lines
2.3 KiB
C++
65 lines
2.3 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 "source/fuzz/fuzzer_pass_propagate_instructions_down.h"
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#include "source/fuzz/fuzzer_context.h"
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#include "source/fuzz/transformation_propagate_instruction_down.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassPropagateInstructionsDown::FuzzerPassPropagateInstructionsDown(
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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 FuzzerPassPropagateInstructionsDown::Apply() {
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for (const auto& function : *GetIRContext()->module()) {
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std::vector<const opt::BasicBlock*> reachable_blocks;
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for (const auto& block : function) {
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if (GetIRContext()->IsReachable(block)) {
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reachable_blocks.push_back(&block);
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}
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}
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for (const auto* block : reachable_blocks) {
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfPropagatingInstructionsDown())) {
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continue;
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}
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if (TransformationPropagateInstructionDown::IsApplicableToBlock(
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GetIRContext(), block->id())) {
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// Record fresh ids for every successor of the |block| that we can
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// propagate an instruction into.
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std::map<uint32_t, uint32_t> fresh_ids;
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for (auto id :
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TransformationPropagateInstructionDown::GetAcceptableSuccessors(
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GetIRContext(), block->id())) {
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fresh_ids[id] = GetFuzzerContext()->GetFreshId();
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}
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ApplyTransformation(TransformationPropagateInstructionDown(
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block->id(), GetFuzzerContext()->GetFreshId(), fresh_ids));
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}
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}
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}
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}
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} // namespace fuzz
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} // namespace spvtools
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