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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.
76 lines
3.0 KiB
C++
76 lines
3.0 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_COPY_OBJECT_H_
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#define SOURCE_FUZZ_TRANSFORMATION_COPY_OBJECT_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 TransformationCopyObject : public Transformation {
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public:
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explicit TransformationCopyObject(
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const protobufs::TransformationCopyObject& message);
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TransformationCopyObject(
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uint32_t object,
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const protobufs::InstructionDescriptor& instruction_to_insert_before,
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uint32_t fresh_id);
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// - |message_.fresh_id| must not be used by the module.
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// - |message_.object| must be a result id that is a legitimate operand for
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// OpCopyObject. In particular, it must be the id of an instruction that
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// has a result type
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// - |message_.object| must not be the target of any decoration.
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// TODO(afd): consider copying decorations along with objects.
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// - |message_.base_instruction_id| must be the result id of an instruction
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// 'base' in some block 'blk'.
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// - 'blk' must contain an instruction 'inst' located |message_.offset|
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// instructions after 'base' (if |message_.offset| = 0 then 'inst' =
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// 'base').
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// - It must be legal to insert an OpCopyObject instruction directly
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// before 'inst'.
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// - |message_.object| must be available directly before 'inst'.
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// - |message_.object| must not be a null pointer or undefined pointer (so as
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// to make it legal to load from copied pointers).
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bool IsApplicable(opt::IRContext* context,
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const FactManager& fact_manager) const override;
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// - A new instruction,
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// %|message_.fresh_id| = OpCopyObject %ty %|message_.object|
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// is added directly before the instruction at |message_.insert_after_id| +
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// |message_|.offset, where %ty is the type of |message_.object|.
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// - The fact that |message_.fresh_id| and |message_.object| are synonyms
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// is added to |fact_manager|.
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// - If |message_.object| is a pointer whose pointee value is known to be
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// irrelevant, the analogous fact is added to |fact_manager| about
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// |message_.fresh_id|.
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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::TransformationCopyObject 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_COPY_OBJECT_H_
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