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Some transformations (e.g. TransformationAddFunction) rely on running the validator to decide whether the transformation is applicable. A recent change allowed spirv-fuzz to take validator options, to cater for the case where a module should be considered valid under particular conditions. However, validation during the checking of transformations had no access to these validator options. This change introduced TransformationContext, which currently consists of a fact manager and a set of validator options, but could in the future have other fields corresponding to other objects that it is useful to have access to when applying transformations. Now, instead of checking and applying transformations in the context of a FactManager, a TransformationContext is used. This gives access to the fact manager as before, and also access to the validator options when they are needed.
84 lines
3.5 KiB
C++
84 lines
3.5 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_ACCESS_CHAIN_H_
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#define SOURCE_FUZZ_TRANSFORMATION_ACCESS_CHAIN_H_
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#include <utility>
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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 TransformationAccessChain : public Transformation {
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public:
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explicit TransformationAccessChain(
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const protobufs::TransformationAccessChain& message);
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TransformationAccessChain(
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uint32_t fresh_id, uint32_t pointer_id,
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const std::vector<uint32_t>& index_id,
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const protobufs::InstructionDescriptor& instruction_to_insert_before);
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// - |message_.fresh_id| must be fresh
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// - |message_.instruction_to_insert_before| must identify an instruction
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// before which it is legitimate to insert an OpAccessChain instruction
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// - |message_.pointer_id| must be a result id with pointer type that is
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// available (according to dominance rules) at the insertion point.
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// - The pointer must not be OpConstantNull or OpUndef
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// - |message_.index_id| must be a sequence of ids of 32-bit integer constants
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// such that it is possible to walk the pointee type of
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// |message_.pointer_id| using these indices, remaining in-bounds.
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// - If type t is the final type reached by walking these indices, the module
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// must include an instruction "OpTypePointer SC %t" where SC is the storage
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// class associated with |message_.pointer_id|
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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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// Adds an instruction of the form:
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// |message_.fresh_id| = OpAccessChain %ptr |message_.index_id|
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// where %ptr is the result if of an instruction declaring a pointer to the
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// type reached by walking the pointee type of |message_.pointer_id| using
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// the indices in |message_.index_id|, and with the same storage class as
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// |message_.pointer_id|.
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//
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// If the fact manager in |transformation_context| reports that
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// |message_.pointer_id| has an irrelevant pointee value, then the fact that
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// |message_.fresh_id| (the result of the access chain) also has an irrelevant
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// pointee value is also recorded.
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void Apply(opt::IRContext* ir_context,
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TransformationContext* transformation_context) const override;
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protobufs::Transformation ToMessage() const override;
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private:
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// Returns {false, 0} if |index_id| does not correspond to a 32-bit integer
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// constant. Otherwise, returns {true, value}, where value is the value of
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// the 32-bit integer constant to which |index_id| corresponds.
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std::pair<bool, uint32_t> GetIndexValue(opt::IRContext* ir_context,
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uint32_t index_id) const;
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protobufs::TransformationAccessChain 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_ACCESS_CHAIN_H_
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