source/fuzz/comparator_deep_blocks_first.h

   1 // Copyright (c) 2020 Google LLC
   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 #ifndef SOURCE_FUZZ_COMPARATOR_BLOCKS_DEEP_FIRST_H_
  16 #define SOURCE_FUZZ_COMPARATOR_BLOCKS_DEEP_FIRST_H_
  17
  18 #include "source/fuzz/fuzzer_util.h"
  19 #include "source/opt/ir_context.h"
  20
  21 namespace spvtools {
  22 namespace fuzz {
  23
  24 // Comparator for blocks, comparing them based on how deep they are nested
  25 // inside selection or loop constructs. Deeper blocks are considered less than
  26 // ones that are not as deep. The blocks are required to be in the same
  27 // function.
  28 class ComparatorDeepBlocksFirst {
  29  public:
  30   explicit ComparatorDeepBlocksFirst(opt::IRContext* ir_context)
  31       : ir_context_(ir_context) {}
  32
  33   bool operator()(uint32_t bb1, uint32_t bb2) const {
  34     return this->operator()(fuzzerutil::MaybeFindBlock(ir_context_, bb1),
  35                             fuzzerutil::MaybeFindBlock(ir_context_, bb2));
  36   }
  37
  38   bool operator()(const opt::BasicBlock* bb1, opt::BasicBlock* bb2) const {
  39     assert(bb1 && bb2 && "The blocks must exist.");
  40     assert(bb1->GetParent() == bb2->GetParent() &&
  41            "The blocks must be in the same functions.");
  42     return ir_context_->GetStructuredCFGAnalysis()->NestingDepth(bb1->id()) >
  43            ir_context_->GetStructuredCFGAnalysis()->NestingDepth(bb2->id());
  44   }
  45
  46  private:
  47   opt::IRContext* ir_context_;
  48 };
  49
  50 }  // namespace fuzz
  51 }  // namespace spvtools
  52
  53 #endif  // SOURCE_FUZZ_COMPARATOR_BLOCKS_DEEP_FIRST_H_