llvm/llvm/include/llvm/CodeGen/SelectionDAG.h

//===- llvm/CodeGen/SelectionDAG.h - InstSelection DAG ----------*- 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
//
//===----------------------------------------------------------------------===//
//
// This file declares the SelectionDAG class, and transitively defines the
// SDNode class and subclasses.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_SELECTIONDAG_H
#define LLVM_CODEGEN_SELECTIONDAG_H

#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/ilist.h"
#include "llvm/ADT/iterator.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/CodeGen/DAGCombine.h"
#include "llvm/CodeGen/ISDOpcodes.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachinePassManager.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/CodeGenTypes/MachineValueType.h"
#include "llvm/IR/ConstantRange.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/IR/Metadata.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/ArrayRecycler.h"
#include "llvm/Support/CodeGen.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/RecyclingAllocator.h"
#include <cassert>
#include <cstdint>
#include <functional>
#include <map>
#include <string>
#include <tuple>
#include <utility>
#include <vector>

namespace llvm {

class DIExpression;
class DILabel;
class DIVariable;
class Function;
class Pass;
class Type;
template <class GraphType> struct GraphTraits;
template <typename T, unsigned int N> class SmallSetVector;
template <typename T, typename Enable> struct FoldingSetTrait;
class AAResults;
class BlockAddress;
class BlockFrequencyInfo;
class Constant;
class ConstantFP;
class ConstantInt;
class DataLayout;
struct fltSemantics;
class FunctionLoweringInfo;
class FunctionVarLocs;
class GlobalValue;
struct KnownBits;
class LLVMContext;
class MachineBasicBlock;
class MachineConstantPoolValue;
class MachineModuleInfo;
class MCSymbol;
class OptimizationRemarkEmitter;
class ProfileSummaryInfo;
class SDDbgValue;
class SDDbgOperand;
class SDDbgLabel;
class SelectionDAG;
class SelectionDAGTargetInfo;
class TargetLibraryInfo;
class TargetLowering;
class TargetMachine;
class TargetSubtargetInfo;
class Value;

template <typename T> class GenericSSAContext;
SSAContext;
template <typename T> class GenericUniformityInfo;
UniformityInfo;

class SDVTListNode : public FoldingSetNode { … };

/// Specialize FoldingSetTrait for SDVTListNode
/// to avoid computing temp FoldingSetNodeID and hash value.
template<> struct FoldingSetTrait<SDVTListNode> : DefaultFoldingSetTrait<SDVTListNode> { … };

template <> struct ilist_alloc_traits<SDNode> { … };

/// Keeps track of dbg_value information through SDISel.  We do
/// not build SDNodes for these so as not to perturb the generated code;
/// instead the info is kept off to the side in this structure. Each SDNode may
/// have one or more associated dbg_value entries. This information is kept in
/// DbgValMap.
/// Byval parameters are handled separately because they don't use alloca's,
/// which busts the normal mechanism.  There is good reason for handling all
/// parameters separately:  they may not have code generated for them, they
/// should always go at the beginning of the function regardless of other code
/// motion, and debug info for them is potentially useful even if the parameter
/// is unused.  Right now only byval parameters are handled separately.
class SDDbgInfo { … };

void checkForCycles(const SelectionDAG *DAG, bool force = false);

/// This is used to represent a portion of an LLVM function in a low-level
/// Data Dependence DAG representation suitable for instruction selection.
/// This DAG is constructed as the first step of instruction selection in order
/// to allow implementation of machine specific optimizations
/// and code simplifications.
///
/// The representation used by the SelectionDAG is a target-independent
/// representation, which has some similarities to the GCC RTL representation,
/// but is significantly more simple, powerful, and is a graph form instead of a
/// linear form.
///
class SelectionDAG { … };

template <> struct GraphTraits<SelectionDAG*> : public GraphTraits<SDNode*> { … };

} // end namespace llvm

#endif // LLVM_CODEGEN_SELECTIONDAG_H