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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
// This class is used to perform data flow optimizations.
// An example usage would be:
//
// DataFlow flow(m_pCompiler);
// flow.ForwardAnalysis(callback);
//
// The "callback" object needs to implement the necessary callback
// functions that the "flow" object will call as the data flow
// analysis progresses.
//
#pragma once
#include "compiler.h"
#include "jitstd.h"
class DataFlow
{
private:
DataFlow();
public:
// The callback interface that needs to be implemented by anyone
// needing updates by the dataflow object.
class Callback
{
public:
Callback(Compiler* pCompiler);
void StartMerge(BasicBlock* block);
void Merge(BasicBlock* block, BasicBlock* pred, flowList* preds);
bool EndMerge(BasicBlock* block);
private:
Compiler* m_pCompiler;
};
DataFlow(Compiler* pCompiler);
template <typename TCallback>
void ForwardAnalysis(TCallback& callback);
private:
Compiler* m_pCompiler;
};
template <typename TCallback>
void DataFlow::ForwardAnalysis(TCallback& callback)
{
jitstd::list<BasicBlock*> worklist(jitstd::allocator<void>(m_pCompiler->getAllocator()));
worklist.insert(worklist.begin(), m_pCompiler->fgFirstBB);
while (!worklist.empty())
{
BasicBlock* block = *(worklist.begin());
worklist.erase(worklist.begin());
callback.StartMerge(block);
{
flowList* preds = m_pCompiler->BlockPredsWithEH(block);
for (flowList* pred = preds; pred; pred = pred->flNext)
{
callback.Merge(block, pred->flBlock, preds);
}
}
if (callback.EndMerge(block))
{
AllSuccessorIter succsBegin = block->GetAllSuccs(m_pCompiler).begin();
AllSuccessorIter succsEnd = block->GetAllSuccs(m_pCompiler).end();
for (AllSuccessorIter succ = succsBegin; succ != succsEnd; ++succ)
{
worklist.insert(worklist.end(), *succ);
}
}
}
}
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