1 // Copyright (c) 2020 André Perez Maselco
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include "source/fuzz/fuzzer_pass_adjust_branch_weights.h"
16
17 #include "source/fuzz/fuzzer_util.h"
18 #include "source/fuzz/instruction_descriptor.h"
19 #include "source/fuzz/transformation_adjust_branch_weights.h"
20
21 namespace spvtools {
22 namespace fuzz {
23
FuzzerPassAdjustBranchWeights( opt::IRContext* ir_context, TransformationContext* transformation_context, FuzzerContext* fuzzer_context, protobufs::TransformationSequence* transformations, bool ignore_inapplicable_transformations)24 FuzzerPassAdjustBranchWeights::FuzzerPassAdjustBranchWeights(
25 opt::IRContext* ir_context, TransformationContext* transformation_context,
26 FuzzerContext* fuzzer_context,
27 protobufs::TransformationSequence* transformations,
28 bool ignore_inapplicable_transformations)
29 : FuzzerPass(ir_context, transformation_context, fuzzer_context,
30 transformations, ignore_inapplicable_transformations) {}
31
Apply()32 void FuzzerPassAdjustBranchWeights::Apply() {
33 // For all OpBranchConditional instructions,
34 // randomly applies the transformation.
35 GetIRContext()->module()->ForEachInst([this](opt::Instruction* instruction) {
36 if (instruction->opcode() == spv::Op::OpBranchConditional &&
37 GetFuzzerContext()->ChoosePercentage(
38 GetFuzzerContext()->GetChanceOfAdjustingBranchWeights())) {
39 ApplyTransformation(TransformationAdjustBranchWeights(
40 MakeInstructionDescriptor(GetIRContext(), instruction),
41 GetFuzzerContext()->GetRandomBranchWeights()));
42 }
43 });
44 }
45
46 } // namespace fuzz
47 } // namespace spvtools
48