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https://github.com/KhronosGroup/SPIRV-Tools
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fe10239f92
This change adds fuzzer passes that sprinkle loads and stores into a module at random, with stores restricted to occur in either dead blocks, or to use pointers for which it is known that the pointee value does not influence the module's overall behaviour. The change also generalises the VariableValueIsArbitrary fact to PointeeValueIsIrrelevant, to allow stores through access chains or object copies of variables whose values are known to be irrelevant. The change includes some other minor refactorings.
64 lines
2.4 KiB
C++
64 lines
2.4 KiB
C++
// Copyright (c) 2020 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_STORE_H_
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#define SOURCE_FUZZ_TRANSFORMATION_STORE_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 TransformationStore : public Transformation {
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public:
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explicit TransformationStore(const protobufs::TransformationStore& message);
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TransformationStore(
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uint32_t pointer_id, uint32_t value_id,
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const protobufs::InstructionDescriptor& instruction_to_insert_before);
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// - |message_.pointer_id| must be the id of a pointer
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// - The pointer type must not have read-only storage class
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// - The pointer must not be OpConstantNull or OpUndef
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// - |message_.value_id| must be an instruction result id that has the same
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// type as the pointee type of |message_.pointer_id|
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// - |message_.instruction_to_insert_before| must identify an instruction
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// before which it is valid to insert an OpStore, and where both
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// |message_.pointer_id| and |message_.value_id| are available (according
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// to dominance rules)
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// - Either the insertion point must be in a dead block, or it must be known
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// that the pointee value of |message_.pointer_id| is irrelevant
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bool IsApplicable(opt::IRContext* context,
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const FactManager& fact_manager) const override;
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// Adds an instruction of the form:
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// OpStore |pointer_id| |value_id|
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// before the instruction identified by
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// |message_.instruction_to_insert_before|.
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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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private:
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protobufs::TransformationStore 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_STORE_H_
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