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https://github.com/KhronosGroup/SPIRV-Tools
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efc85ff661
This PR changes FuzzerPassOutlineFunctions so that it uses some transformation that make the TransformationOutlineFunction transformation applicable in more cases. See the discussion in #3095 for more details. Fixes #3095.
66 lines
2.5 KiB
C++
66 lines
2.5 KiB
C++
// Copyright (c) 2019 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_FUZZER_PASS_OUTLINE_FUNCTIONS_H_
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#define SOURCE_FUZZ_FUZZER_PASS_OUTLINE_FUNCTIONS_H_
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#include "source/fuzz/fuzzer_pass.h"
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namespace spvtools {
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namespace fuzz {
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// A fuzzer pass for outlining single-entry single-exit regions of a control
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// flow graph into their own functions.
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class FuzzerPassOutlineFunctions : public FuzzerPass {
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public:
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FuzzerPassOutlineFunctions(
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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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~FuzzerPassOutlineFunctions();
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void Apply() override;
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// Returns a block suitable to be an entry block for a region that can be
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// outlined, i.e. a block that is not a loop header and that does not start
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// with OpPhi or OpVariable. In particular, it returns:
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// - |entry_block| if it is suitable
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// - otherwise, a block found by:
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// - looking for or creating a new preheader, if |entry_block| is a loop
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// header
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// - splitting the candidate entry block, if it starts with OpPhi or
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// OpVariable.
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// Returns nullptr if a suitable block cannot be found following the
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// instructions above.
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opt::BasicBlock* MaybeGetEntryBlockSuitableForOutlining(
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opt::BasicBlock* entry_block);
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// Returns:
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// - |exit_block| if it is not a merge block
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// - the second block obtained by splitting |exit_block|, if |exit_block| is a
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// merge block.
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// Assumes that |exit_block| is not a continue target.
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// The block returned by this function should be suitable to be the exit block
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// of a region that can be outlined.
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// Returns nullptr if |exit_block| is a merge block and it cannot be split.
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opt::BasicBlock* MaybeGetExitBlockSuitableForOutlining(
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opt::BasicBlock* exit_block);
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};
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} // namespace fuzz
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} // namespace spvtools
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#endif // SOURCE_FUZZ_FUZZER_PASS_OUTLINE_FUNCTIONS_H_
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