source/fuzz/fuzzer_pass_propagate_instructions_up.cpp

   1 // Copyright (c) 2020 Vasyl Teliman
   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_propagate_instructions_up.h"
  16
  17 #include "source/fuzz/fuzzer_context.h"
  18 #include "source/fuzz/fuzzer_util.h"
  19 #include "source/fuzz/instruction_descriptor.h"
  20 #include "source/fuzz/transformation_propagate_instruction_up.h"
  21
  22 namespace spvtools {
  23 namespace fuzz {
  24
  25 FuzzerPassPropagateInstructionsUp::FuzzerPassPropagateInstructionsUp(
  26     opt::IRContext* ir_context, TransformationContext* transformation_context,
  27     FuzzerContext* fuzzer_context,
  28     protobufs::TransformationSequence* transformations,
  29     bool ignore_inapplicable_transformations)
  30     : FuzzerPass(ir_context, transformation_context, fuzzer_context,
  31                  transformations, ignore_inapplicable_transformations) {}
  32
  33 void FuzzerPassPropagateInstructionsUp::Apply() {
  34   for (const auto& function : *GetIRContext()->module()) {
  35     for (const auto& block : function) {
  36       if (!GetFuzzerContext()->ChoosePercentage(
  37               GetFuzzerContext()->GetChanceOfPropagatingInstructionsUp())) {
  38         continue;
  39       }
  40
  41       if (TransformationPropagateInstructionUp::IsApplicableToBlock(
  42               GetIRContext(), block.id())) {
  43         std::map<uint32_t, uint32_t> fresh_ids;
  44         for (auto id : GetIRContext()->cfg()->preds(block.id())) {
  45           auto& fresh_id = fresh_ids[id];
  46
  47           if (!fresh_id) {
  48             // Create a fresh id if it hasn't been created yet. |fresh_id| will
  49             // be default-initialized to 0 in this case.
  50             fresh_id = GetFuzzerContext()->GetFreshId();
  51           }
  52         }
  53         ApplyTransformation(
  54             TransformationPropagateInstructionUp(block.id(), fresh_ids));
  55       }
  56     }
  57   }
  58 }
  59
  60 }  // namespace fuzz
  61 }  // namespace spvtools