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//===-- WebAssemblySortRegion.h - WebAssembly Sort SortRegion ----*- C++-*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief This file implements regions used in CFGSort and CFGStackify.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYSORTREGION_H
#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYSORTREGION_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/iterator_range.h"
namespace llvm {
class MachineBasicBlock;
class MachineLoop;
class MachineLoopInfo;
class WebAssemblyException;
class WebAssemblyExceptionInfo;
namespace WebAssembly {
// Wrapper for loops and exceptions
class SortRegion {
public:
virtual ~SortRegion() = default;
virtual MachineBasicBlock *getHeader() const = 0;
virtual bool contains(const MachineBasicBlock *MBB) const = 0;
virtual unsigned getNumBlocks() const = 0;
using block_iterator = typename ArrayRef<MachineBasicBlock *>::const_iterator;
virtual iterator_range<block_iterator> blocks() const = 0;
virtual bool isLoop() const = 0;
};
template <typename T> class ConcreteSortRegion : public SortRegion {
const T *Unit;
public:
ConcreteSortRegion(const T *Unit) : Unit(Unit) {}
MachineBasicBlock *getHeader() const override { return Unit->getHeader(); }
bool contains(const MachineBasicBlock *MBB) const override {
return Unit->contains(MBB);
}
unsigned getNumBlocks() const override { return Unit->getNumBlocks(); }
iterator_range<block_iterator> blocks() const override {
return Unit->blocks();
}
bool isLoop() const override { return false; }
};
// This class has information of nested SortRegions; this is analogous to what
// LoopInfo is for loops.
class SortRegionInfo {
friend class ConcreteSortRegion<MachineLoopInfo>;
friend class ConcreteSortRegion<WebAssemblyException>;
const MachineLoopInfo &MLI;
const WebAssemblyExceptionInfo &WEI;
DenseMap<const MachineLoop *, std::unique_ptr<SortRegion>> LoopMap;
DenseMap<const WebAssemblyException *, std::unique_ptr<SortRegion>>
ExceptionMap;
public:
SortRegionInfo(const MachineLoopInfo &MLI,
const WebAssemblyExceptionInfo &WEI)
: MLI(MLI), WEI(WEI) {}
// Returns a smallest loop or exception that contains MBB
const SortRegion *getRegionFor(const MachineBasicBlock *MBB);
// Return the "bottom" block among all blocks dominated by the region
// (MachineLoop or WebAssemblyException) header. This works when the entity is
// discontiguous.
MachineBasicBlock *getBottom(const SortRegion *R);
MachineBasicBlock *getBottom(const MachineLoop *ML);
MachineBasicBlock *getBottom(const WebAssemblyException *WE);
};
} // end namespace WebAssembly
} // end namespace llvm
#endif
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