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https://github.com/KhronosGroup/SPIRV-Tools
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fcb22ecf0f
Adds a virtual method, GetFreshIds(), to Transformation. Every transformation uses this to indicate which ids in its protobuf message are fresh ids. This means that when replaying a sequence of transformations the replayer can obtain a smallest id that is not in use by the module already and that will not be used by any transformation by necessity. Ids greater than or equal to this id can be used as overflow ids. Fixes #3851.
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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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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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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// - the object being indexed is not a composite 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> GetIndexValue(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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