SPIRV-Tools/source/fuzz/transformation_access_chain.h

84 lines
3.5 KiB
C
Raw Normal View History

// Copyright (c) 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SOURCE_FUZZ_TRANSFORMATION_ACCESS_CHAIN_H_
#define SOURCE_FUZZ_TRANSFORMATION_ACCESS_CHAIN_H_
#include <utility>
#include "source/fuzz/protobufs/spirvfuzz_protobufs.h"
#include "source/fuzz/transformation.h"
#include "source/fuzz/transformation_context.h"
#include "source/opt/ir_context.h"
namespace spvtools {
namespace fuzz {
class TransformationAccessChain : public Transformation {
public:
explicit TransformationAccessChain(
const protobufs::TransformationAccessChain& message);
TransformationAccessChain(
uint32_t fresh_id, uint32_t pointer_id,
const std::vector<uint32_t>& index_id,
const protobufs::InstructionDescriptor& instruction_to_insert_before);
// - |message_.fresh_id| must be fresh
// - |message_.instruction_to_insert_before| must identify an instruction
// before which it is legitimate to insert an OpAccessChain instruction
// - |message_.pointer_id| must be a result id with pointer type that is
// available (according to dominance rules) at the insertion point.
// - The pointer must not be OpConstantNull or OpUndef
// - |message_.index_id| must be a sequence of ids of 32-bit integer constants
// such that it is possible to walk the pointee type of
// |message_.pointer_id| using these indices, remaining in-bounds.
// - If type t is the final type reached by walking these indices, the module
// must include an instruction "OpTypePointer SC %t" where SC is the storage
// class associated with |message_.pointer_id|
bool IsApplicable(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const override;
// Adds an instruction of the form:
// |message_.fresh_id| = OpAccessChain %ptr |message_.index_id|
// where %ptr is the result if of an instruction declaring a pointer to the
// type reached by walking the pointee type of |message_.pointer_id| using
// the indices in |message_.index_id|, and with the same storage class as
// |message_.pointer_id|.
//
// If the fact manager in |transformation_context| reports that
// |message_.pointer_id| has an irrelevant pointee value, then the fact that
// |message_.fresh_id| (the result of the access chain) also has an irrelevant
// pointee value is also recorded.
void Apply(opt::IRContext* ir_context,
TransformationContext* transformation_context) const override;
protobufs::Transformation ToMessage() const override;
private:
// Returns {false, 0} if |index_id| does not correspond to a 32-bit integer
// constant. Otherwise, returns {true, value}, where value is the value of
// the 32-bit integer constant to which |index_id| corresponds.
std::pair<bool, uint32_t> GetIndexValue(opt::IRContext* ir_context,
uint32_t index_id) const;
protobufs::TransformationAccessChain message_;
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_TRANSFORMATION_ACCESS_CHAIN_H_