mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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7bc114ba2f
Before this change, spirv-fuzz would replace a pointer argument to a function call with a synonym, which is problematic when the synonym is not a memory object declaration, since function call arguments are required to be memory object declarations. This change adds a check to ensure that such a replacement is not made. Fixes #2896.
75 lines
3.1 KiB
C++
75 lines
3.1 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_REPLACE_ID_WITH_SYNONYM_H_
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#define SOURCE_FUZZ_TRANSFORMATION_REPLACE_ID_WITH_SYNONYM_H_
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#include "source/fuzz/fact_manager.h"
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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/opt/ir_context.h"
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namespace spvtools {
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namespace fuzz {
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class TransformationReplaceIdWithSynonym : public Transformation {
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public:
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explicit TransformationReplaceIdWithSynonym(
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const protobufs::TransformationReplaceIdWithSynonym& message);
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TransformationReplaceIdWithSynonym(
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protobufs::IdUseDescriptor id_use_descriptor,
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protobufs::DataDescriptor data_descriptor,
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uint32_t fresh_id_for_temporary);
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// - The fact manager must know that the id identified by
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// |message_.id_use_descriptor| is synonomous with
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// |message_.data_descriptor|.
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// - Replacing the id in |message_.id_use_descriptor| by the synonym in
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// |message_.data_descriptor| must respect SPIR-V's rules about uses being
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// dominated by their definitions.
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// - The id must not be an index into an access chain whose base object has
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// struct type, as such indices must be constants.
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// - The id must not be a pointer argument to a function call (because the
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// synonym might not be a memory object declaration).
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// - |fresh_id_for_temporary| must be 0.
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// TODO(https://github.com/KhronosGroup/SPIRV-Tools/issues/2855): the
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// motivation for the temporary is to support the case where an id is
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// synonymous with an element of a composite. Until support for that is
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// implemented, 0 records that no temporary is needed.
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bool IsApplicable(opt::IRContext* context,
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const FactManager& fact_manager) const override;
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// Replaces the use identified by |message_.id_use_descriptor| with the
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// synonymous id identified by |message_.data_descriptor|.
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// TODO(https://github.com/KhronosGroup/SPIRV-Tools/issues/2855): in due
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// course it will also be necessary to add an additional instruction to pull
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// the synonym out of a composite.
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void Apply(opt::IRContext* context, FactManager* fact_manager) const override;
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protobufs::Transformation ToMessage() const override;
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static bool ReplacingUseWithSynonymIsOk(
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opt::IRContext* context, opt::Instruction* use_instruction,
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uint32_t use_in_operand_index, const protobufs::DataDescriptor& synonym);
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private:
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protobufs::TransformationReplaceIdWithSynonym 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_REPLACE_ID_WITH_SYNONYM_H_
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