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https://github.com/KhronosGroup/SPIRV-Tools
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f62357e7b8
This transformation, given the header of a selection construct with branching instruction OpBranchConditional, flattens it. Side-effecting operations such as OpLoad, OpStore and OpFunctionCall are enclosed within smaller conditionals. It is applicable if the construct does not contain inner selection constructs or loops, or atomic or barrier instructions. The corresponding fuzzer pass looks for selection headers and tries to flatten them. Needed for the issue #3544, but it does not fix it completely.
54 lines
1.9 KiB
C++
54 lines
1.9 KiB
C++
// Copyright (c) 2020 Google LLC
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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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#ifndef SOURCE_FUZZ_COMPARATOR_BLOCKS_DEEP_FIRST_H_
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#define SOURCE_FUZZ_COMPARATOR_BLOCKS_DEEP_FIRST_H_
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#include "source/fuzz/fuzzer_util.h"
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#include "source/opt/ir_context.h"
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namespace spvtools {
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namespace fuzz {
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// Comparator for blocks, comparing them based on how deep they are nested
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// inside selection or loop constructs. Deeper blocks are considered less than
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// ones that are not as deep. The blocks are required to be in the same
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// function.
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class ComparatorDeepBlocksFirst {
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public:
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explicit ComparatorDeepBlocksFirst(opt::IRContext* ir_context)
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: ir_context_(ir_context) {}
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bool operator()(uint32_t bb1, uint32_t bb2) const {
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return this->operator()(fuzzerutil::MaybeFindBlock(ir_context_, bb1),
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fuzzerutil::MaybeFindBlock(ir_context_, bb2));
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}
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bool operator()(const opt::BasicBlock* bb1, opt::BasicBlock* bb2) const {
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assert(bb1 && bb2 && "The blocks must exist.");
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assert(bb1->GetParent() == bb2->GetParent() &&
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"The blocks must be in the same functions.");
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return ir_context_->GetStructuredCFGAnalysis()->NestingDepth(bb1->id()) >
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ir_context_->GetStructuredCFGAnalysis()->NestingDepth(bb2->id());
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}
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private:
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opt::IRContext* ir_context_;
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};
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} // namespace fuzz
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} // namespace spvtools
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#endif // SOURCE_FUZZ_COMPARATOR_BLOCKS_DEEP_FIRST_H_
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