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https://github.com/KhronosGroup/SPIRV-Tools
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107 lines
4.7 KiB
C++
107 lines
4.7 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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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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const std::vector<std::pair<uint32_t, uint32_t>>& fresh_ids_for_clamping =
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{});
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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 integers
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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.
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// - All indices used to access a struct must be OpConstant.
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// - The indices used to index non-struct composites will be clamped to be
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// in bound. Enough fresh ids must be given in
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// |message_.fresh_id_for_clamping| to perform clamping (2 for
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// each index accessing a non-struct). This requires the bool type and
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// a constant of value (bound - 1) to be declared in the module.
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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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// For each of the indices traversing non-struct composites, two clamping
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// instructions are added using ids in |message_.fresh_id_for_clamping|.
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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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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 {false, 0} in each of the following cases:
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// - |index_id| does not correspond to a 32-bit integer constant
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// - |object_type_id| must be a struct type
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// - the constant at |index_id| is out of bounds.
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// Otherwise, returns {true, value}, where value is the value of the constant
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// at |index_id|.
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std::pair<bool, uint32_t> GetStructIndexValue(opt::IRContext* ir_context,
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uint32_t index_id,
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uint32_t object_type_id) const;
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// Returns true if |index_id| corresponds, in the given context, to a 32-bit
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// integer which can be used to index an object of the type specified by
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// |object_type_id|. Returns false otherwise.
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static bool ValidIndexToComposite(opt::IRContext* ir_context,
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uint32_t index_id, uint32_t object_type_id);
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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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