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// Copyright (c) 2019 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
// 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 <vector>
#include "source/fuzz/fact_manager.h"
#include "source/fuzz/protobufs/spirvfuzz_protobufs.h"
#include "source/fuzz/transformation.h"
#include "source/opt/ir_context.h"
namespace spvtools {
namespace fuzz {
class TransformationAddDeadContinue : public Transformation {
explicit TransformationAddDeadContinue(
const protobufs::TransformationAddDeadContinue& message);
TransformationAddDeadContinue(uint32_t from_block,
bool continue_condition_value,
std::vector<uint32_t> phi_id);
// - |message_.from_block| must be the id of a block a in the given module.
// - a must be contained in a loop with continue target b
// - The continue target b must be dominated by the head of the loop in which
// it is contained
// - b must not be the merge block of a selection construct
// - if |message_.continue_condition_value| holds (does not hold) then
// OpConstantTrue (OpConstantFalse) must be present in the module
// - |message_.phi_ids| must be a list of ids that are all available at
// |message_.from_block|
// - a must end with an unconditional branch to some block c.
// - replacing this branch with a conditional branch to b or c, with
// the boolean constant associated with |message_.continue_condition_value|
// as the condition, and the ids in |message_.phi_ids| used to extend any
// OpPhi instructions at b as a result of the edge from a, must maintain
// validity of the module.
// In particular, adding an edge from somewhere in the loop to the continue
// target must not prevent uses of ids in the continue target from being
// dominated by the definitions of those ids.
bool IsApplicable(opt::IRContext* context,
const FactManager& fact_manager) const override;
// Replaces the terminator of a with a conditional branch to b or c.
// The boolean constant associated with |message_.continue_condition_value| is
// used as the condition, and the order of b and c is arranged such that
// control is guaranteed to jump to c.
void Apply(opt::IRContext* context, FactManager* fact_manager) const override;
protobufs::Transformation ToMessage() const override;
// Used by 'Apply' to actually apply the transformation to the module of
// interest, and by 'IsApplicable' to do a dry-run of the transformation on a
// cloned module, in order to check that the transformation leads to a valid
// module. This is only invoked by 'IsApplicable' after certain basic
// applicability checks have been made, ensuring that the invocation of this
// method is legal.
void ApplyImpl(opt::IRContext* context) const;
protobufs::TransformationAddDeadContinue message_;
} // namespace fuzz
} // namespace spvtools