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https://github.com/KhronosGroup/SPIRV-Tools
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fcb22ecf0f
Adds a virtual method, GetFreshIds(), to Transformation. Every transformation uses this to indicate which ids in its protobuf message are fresh ids. This means that when replaying a sequence of transformations the replayer can obtain a smallest id that is not in use by the module already and that will not be used by any transformation by necessity. Ids greater than or equal to this id can be used as overflow ids. Fixes #3851.
90 lines
3.8 KiB
C++
90 lines
3.8 KiB
C++
// Copyright (c) 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SOURCE_FUZZ_TRANSFORMATION_ADD_DEAD_BREAK_H_
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#define SOURCE_FUZZ_TRANSFORMATION_ADD_DEAD_BREAK_H_
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#include <vector>
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#include "source/fuzz/protobufs/spirvfuzz_protobufs.h"
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#include "source/fuzz/transformation.h"
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#include "source/fuzz/transformation_context.h"
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#include "source/opt/ir_context.h"
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namespace spvtools {
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namespace fuzz {
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class TransformationAddDeadBreak : public Transformation {
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public:
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explicit TransformationAddDeadBreak(
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const protobufs::TransformationAddDeadBreak& message);
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TransformationAddDeadBreak(uint32_t from_block, uint32_t to_block,
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bool break_condition_value,
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std::vector<uint32_t> phi_id);
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// - |message_.from_block| must be the id of a block a in the given module.
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// - |message_.to_block| must be the id of a block b in the given module.
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// - if |message_.break_condition_value| holds (does not hold) then
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// OpConstantTrue (OpConstantFalse) must be present in the module
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// - |message_.phi_ids| must be a list of ids that are all available at
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// |message_.from_block|
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// - a and b must be in the same function.
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// - b must be a merge block.
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// - a must end with an unconditional branch to some block c.
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// - replacing this branch with a conditional branch to b or c, with
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// the boolean constant associated with |message_.break_condition_value| as
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// the condition, and the ids in |message_.phi_ids| used to extend
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// any OpPhi instructions at b as a result of the edge from a, must
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// maintain validity of the module.
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// In particular, the new branch must not lead to violations of the rule
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// that a use must be dominated by its definition.
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bool IsApplicable(
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opt::IRContext* ir_context,
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const TransformationContext& transformation_context) const override;
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// Replaces the terminator of a with a conditional branch to b or c.
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// The boolean constant associated with |message_.break_condition_value| is
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// used as the condition, and the order of b and c is arranged such that
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// control is guaranteed to jump to c.
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void Apply(opt::IRContext* ir_context,
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TransformationContext* transformation_context) const override;
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std::unordered_set<uint32_t> GetFreshIds() const override;
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protobufs::Transformation ToMessage() const override;
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private:
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// Returns true if and only if adding an edge from |bb_from| to
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// |message_.to_block| respects structured control flow.
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bool AddingBreakRespectsStructuredControlFlow(opt::IRContext* ir_context,
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opt::BasicBlock* bb_from) const;
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// Used by 'Apply' to actually apply the transformation to the module of
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// interest, and by 'IsApplicable' to do a dry-run of the transformation on a
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// cloned module, in order to check that the transformation leads to a valid
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// module. This is only invoked by 'IsApplicable' after certain basic
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// applicability checks have been made, ensuring that the invocation of this
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// method is legal.
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void ApplyImpl(opt::IRContext* ir_context,
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const TransformationContext& transformation_context) const;
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protobufs::TransformationAddDeadBreak message_;
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};
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} // namespace fuzz
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} // namespace spvtools
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#endif // SOURCE_FUZZ_TRANSFORMATION_ADD_DEAD_BREAK_H_
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