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// Copyright (c) 2020 Vasyl Teliman
// 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
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include <map>
#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 TransformationPropagateInstructionUp : public Transformation {
explicit TransformationPropagateInstructionUp(
protobufs::TransformationPropagateInstructionUp message);
uint32_t block_id,
const std::map<uint32_t, uint32_t>& predecessor_id_to_fresh_id);
// - |block_id| must be a valid result id of some OpLabel instruction.
// - |block_id| must have at least one predecessor
// - |block_id| must contain an instruction that can be propagated using this
// transformation
// - the instruction can be propagated if:
// - it's not an OpPhi
// - it is supported by this transformation
// - it depends only on instructions from different basic blocks or on
// OpPhi instructions from the same basic block
// - it should be possible to insert the propagated instruction at the end of
// each |block_id|'s predecessor
// - |predecessor_id_to_fresh_id| must have an entry for at least every
// predecessor of |block_id|
// - each value in the |predecessor_id_to_fresh_id| map must be a fresh id
// - all fresh ids in the |predecessor_id_to_fresh_id| must be unique
bool IsApplicable(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const override;
// Inserts a copy of the propagated instruction into each |block_id|'s
// predecessor. Replaces the original instruction with an OpPhi referring
// inserted copies.
void Apply(opt::IRContext* ir_context,
TransformationContext* transformation_context) const override;
std::unordered_set<uint32_t> GetFreshIds() const override;
protobufs::Transformation ToMessage() const override;
// Returns true if this transformation can be applied to the block with id
// |block_id|. Concretely, returns true iff:
// - |block_id| is a valid id of some block in the module
// - |block_id| has predecessors
// - |block_id| contains an instruction that can be propagated
// - it is possible to insert the propagated instruction into every
// |block_id|'s predecessor
static bool IsApplicableToBlock(opt::IRContext* ir_context,
uint32_t block_id);
// Returns the instruction that will be propagated into the predecessors of
// the |block_id|. Returns nullptr if no such an instruction exists.
static opt::Instruction* GetInstructionToPropagate(opt::IRContext* ir_context,
uint32_t block_id);
// Returns true if |opcode| is supported by this transformation.
static bool IsOpcodeSupported(SpvOp opcode);
protobufs::TransformationPropagateInstructionUp message_;
} // namespace fuzz
} // namespace spvtools