| // Copyright (c) 2020 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef SOURCE_FUZZ_TRANSFORMATION_REPLACE_BRANCH_FROM_DEAD_BLOCK_WITH_EXIT_H_ |
| #define SOURCE_FUZZ_TRANSFORMATION_REPLACE_BRANCH_FROM_DEAD_BLOCK_WITH_EXIT_H_ |
| |
| #include "source/fuzz/protobufs/spirvfuzz_protobufs.h" |
| #include "source/fuzz/transformation.h" |
| #include "source/fuzz/transformation_context.h" |
| #include "source/opt/basic_block.h" |
| #include "source/opt/ir_context.h" |
| |
| namespace spvtools { |
| namespace fuzz { |
| |
| class TransformationReplaceBranchFromDeadBlockWithExit : public Transformation { |
| public: |
| explicit TransformationReplaceBranchFromDeadBlockWithExit( |
| protobufs::TransformationReplaceBranchFromDeadBlockWithExit message); |
| |
| TransformationReplaceBranchFromDeadBlockWithExit(uint32_t block_id, |
| SpvOp opcode, |
| uint32_t return_value_id); |
| |
| // - |message_.block_id| must be the id of a dead block that is not part of |
| // a continue construct |
| // - |message_.block_id| must end with OpBranch |
| // - The successor of |message_.block_id| must have at least one other |
| // predecessor |
| // - |message_.opcode()| must be one of OpKill, OpReturn, OpReturnValue and |
| // OpUnreachable |
| // - |message_.opcode()| can only be OpKill if the module's entry points all |
| // have Fragment execution mode |
| // - |message_.opcode()| can only be OpReturn if the return type of the |
| // function containing the block is void |
| // - If |message_.opcode()| is OpReturnValue then |message_.return_value_id| |
| // must be an id that is available at the block terminator and that matches |
| // the return type of the enclosing function |
| // - Domination rules should be preserved when we apply this transformation. |
| // In particular, if some block appears after the |block_id|'s successor in |
| // the CFG, then that block cannot dominate |block_id|'s successor when this |
| // transformation is applied. |
| bool IsApplicable( |
| opt::IRContext* ir_context, |
| const TransformationContext& transformation_context) const override; |
| |
| // Changes the terminator of |message_.block_id| to have opcode |
| // |message_.opcode|, additionally with input operand |
| // |message_.return_value_id| in the case that |message_.opcode| is |
| // OpReturnValue. |
| // |
| // If |message_.block_id|'s successor starts with OpPhi instructions these are |
| // updated so that they no longer refer to |message_.block_id|. |
| void Apply(opt::IRContext* ir_context, |
| TransformationContext* transformation_context) const override; |
| |
| std::unordered_set<uint32_t> GetFreshIds() const override; |
| |
| protobufs::Transformation ToMessage() const override; |
| |
| // Returns true if and only if |block| meets the criteria for having its |
| // terminator replaced with an early exit (see IsApplicable for details of the |
| // criteria.) |
| static bool BlockIsSuitable( |
| opt::IRContext* ir_context, |
| const TransformationContext& transformation_context, |
| const opt::BasicBlock& block); |
| |
| private: |
| protobufs::TransformationReplaceBranchFromDeadBlockWithExit message_; |
| }; |
| |
| } // namespace fuzz |
| } // namespace spvtools |
| |
| #endif // SOURCE_FUZZ_TRANSFORMATION_REPLACE_BRANCH_FROM_DEAD_BLOCK_WITH_EXIT_H_ |