1 // Copyright (c) 2019 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_TRANSFORMATION_MERGE_BLOCKS_H_
16 #define SOURCE_FUZZ_TRANSFORMATION_MERGE_BLOCKS_H_
17 
18 #include "source/fuzz/protobufs/spirvfuzz_protobufs.h"
19 #include "source/fuzz/transformation.h"
20 #include "source/fuzz/transformation_context.h"
21 #include "source/opt/ir_context.h"
22 
23 namespace spvtools {
24 namespace fuzz {
25 
26 class TransformationMergeBlocks : public Transformation {
27  public:
28   explicit TransformationMergeBlocks(
29       const protobufs::TransformationMergeBlocks& message);
30 
31   TransformationMergeBlocks(uint32_t block_id);
32 
33   // - |message_.block_id| must be the id of a block, b
34   // - b must have a single predecessor, a
35   // - b must be the sole successor of a
36   // - Replacing a with the merge of a and b (and removing b) must lead to a
37   //   valid module
38   bool IsApplicable(
39       opt::IRContext* ir_context,
40       const TransformationContext& transformation_context) const override;
41 
42   // The contents of b are merged into a, and a's terminator is replaced with
43   // the terminator of b.  Block b is removed from the module.
44   void Apply(opt::IRContext* ir_context,
45              TransformationContext* transformation_context) const override;
46 
47   std::unordered_set<uint32_t> GetFreshIds() const override;
48 
49   protobufs::Transformation ToMessage() const override;
50 
51  private:
52   protobufs::TransformationMergeBlocks message_;
53 };
54 
55 }  // namespace fuzz
56 }  // namespace spvtools
57 
58 #endif  // SOURCE_FUZZ_TRANSFORMATION_MERGE_BLOCKS_H_
59