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llvm-mirror/include/llvm/CodeGen/SelectionDAG.h
Chris Lattner b9ccf966b8 add a new map
llvm-svn: 22017
2005-05-14 07:36:02 +00:00

267 lines
10 KiB
C++

//===-- llvm/CodeGen/SelectionDAG.h - InstSelection DAG ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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/CodeGen/SelectionDAGNodes.h"
#include <map>
#include <string> // FIXME remove eventually, turning map into const char* map.
namespace llvm {
class TargetLowering;
class TargetMachine;
class MachineFunction;
/// SelectionDAG class - 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 {
TargetLowering &TLI;
MachineFunction &MF;
// Root - The root of the entire DAG. EntryNode - The starting token.
SDOperand Root, EntryNode;
// AllNodes - All of the nodes in the DAG
std::vector<SDNode*> AllNodes;
// ValueNodes - track SrcValue nodes
std::map<std::pair<const Value*, int>, SDNode*> ValueNodes;
public:
SelectionDAG(TargetLowering &tli, MachineFunction &mf) : TLI(tli), MF(mf) {
EntryNode = Root = getNode(ISD::EntryToken, MVT::Other);
}
~SelectionDAG();
MachineFunction &getMachineFunction() const { return MF; }
const TargetMachine &getTarget() const;
TargetLowering &getTargetLoweringInfo() const { return TLI; }
/// viewGraph - Pop up a ghostview window with the DAG rendered using 'dot'.
///
void viewGraph();
typedef std::vector<SDNode*>::const_iterator allnodes_iterator;
allnodes_iterator allnodes_begin() const { return AllNodes.begin(); }
allnodes_iterator allnodes_end() const { return AllNodes.end(); }
/// getRoot - Return the root tag of the SelectionDAG.
///
const SDOperand &getRoot() const { return Root; }
/// getEntryNode - Return the token chain corresponding to the entry of the
/// function.
const SDOperand &getEntryNode() const { return EntryNode; }
/// setRoot - Set the current root tag of the SelectionDAG.
///
const SDOperand &setRoot(SDOperand N) { return Root = N; }
/// Legalize - This transforms the SelectionDAG into a SelectionDAG that is
/// compatible with the target instruction selector, as indicated by the
/// TargetLowering object.
///
/// Note that this is an involved process that may invalidate pointers into
/// the graph.
void Legalize();
/// RemoveDeadNodes - This method deletes all unreachable nodes in the
/// SelectionDAG, including nodes (like loads) that have uses of their token
/// chain but no other uses and no side effect. If a node is passed in as an
/// argument, it is used as the seed for node deletion.
void RemoveDeadNodes(SDNode *N = 0);
SDOperand getConstant(uint64_t Val, MVT::ValueType VT);
SDOperand getConstantFP(double Val, MVT::ValueType VT);
SDOperand getGlobalAddress(const GlobalValue *GV, MVT::ValueType VT);
SDOperand getFrameIndex(int FI, MVT::ValueType VT);
SDOperand getConstantPool(unsigned CPIdx, MVT::ValueType VT);
SDOperand getBasicBlock(MachineBasicBlock *MBB);
SDOperand getExternalSymbol(const char *Sym, MVT::ValueType VT);
SDOperand getCopyToReg(SDOperand Chain, SDOperand N, unsigned Reg) {
// Note: these are auto-CSE'd because the caller doesn't make requests that
// could cause duplicates to occur.
SDNode *NN = new RegSDNode(ISD::CopyToReg, Chain, N, Reg);
NN->setValueTypes(MVT::Other);
AllNodes.push_back(NN);
return SDOperand(NN, 0);
}
SDOperand getCopyFromReg(unsigned Reg, MVT::ValueType VT, SDOperand Chain) {
// Note: These nodes are auto-CSE'd by the caller of this method.
SDNode *NN = new RegSDNode(ISD::CopyFromReg, Chain, Reg);
NN->setValueTypes(VT, MVT::Other);
AllNodes.push_back(NN);
return SDOperand(NN, 0);
}
SDOperand getImplicitDef(SDOperand Chain, unsigned Reg) {
// Note: These nodes are auto-CSE'd by the caller of this method.
SDNode *NN = new RegSDNode(ISD::ImplicitDef, Chain, Reg);
NN->setValueTypes(MVT::Other);
AllNodes.push_back(NN);
return SDOperand(NN, 0);
}
/// getCall - Note that this destroys the vector of RetVals passed in.
///
SDNode *getCall(std::vector<MVT::ValueType> &RetVals, SDOperand Chain,
SDOperand Callee, bool isTailCall = false) {
SDNode *NN = new SDNode(isTailCall ? ISD::TAILCALL : ISD::CALL, Chain,
Callee);
NN->setValueTypes(RetVals);
AllNodes.push_back(NN);
return NN;
}
/// getCall - This is identical to the one above, and should be used for calls
/// where arguments are passed in physical registers. This destroys the
/// RetVals and ArgsInRegs vectors.
SDNode *getCall(std::vector<MVT::ValueType> &RetVals, SDOperand Chain,
SDOperand Callee, std::vector<SDOperand> &ArgsInRegs,
bool isTailCall = false) {
ArgsInRegs.insert(ArgsInRegs.begin(), Callee);
ArgsInRegs.insert(ArgsInRegs.begin(), Chain);
SDNode *NN = new SDNode(isTailCall ? ISD::TAILCALL : ISD::CALL, ArgsInRegs);
NN->setValueTypes(RetVals);
AllNodes.push_back(NN);
return NN;
}
SDOperand getSetCC(ISD::CondCode, MVT::ValueType VT,
SDOperand LHS, SDOperand RHS);
/// getZeroExtendInReg - Return the expression required to zero extend the Op
/// value assuming it was the smaller SrcTy value.
SDOperand getZeroExtendInReg(SDOperand Op, MVT::ValueType SrcTy);
/// getNode - Gets or creates the specified node.
///
SDOperand getNode(unsigned Opcode, MVT::ValueType VT);
SDOperand getNode(unsigned Opcode, MVT::ValueType VT, SDOperand N);
SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
SDOperand N1, SDOperand N2);
SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
SDOperand N1, SDOperand N2, SDOperand N3);
SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4);
SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
std::vector<SDOperand> &Children);
SDOperand getNode(unsigned Opcode, std::vector<MVT::ValueType> &ResultTys,
std::vector<SDOperand> &Ops);
// getNode - These versions take an extra value type for extending and
// truncating loads, stores, rounds, extends etc.
SDOperand getNode(unsigned Opcode, MVT::ValueType VT, SDOperand N1,
SDOperand N2, MVT::ValueType EVT);
SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
SDOperand N, MVT::ValueType EVT);
SDOperand getNode(unsigned Opcode, MVT::ValueType VT, SDOperand N1,
SDOperand N2, SDOperand N3, MVT::ValueType EVT);
SDOperand getNode(unsigned Opcode, MVT::ValueType VT, SDOperand N1,
SDOperand N2, SDOperand N3, SDOperand N4,
MVT::ValueType EVT);
/// getLoad - Loads are not normal binary operators: their result type is not
/// determined by their operands, and they produce a value AND a token chain.
///
SDOperand getLoad(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr,
SDOperand SV);
// getSrcValue - construct a node to track a Value* through the backend
SDOperand getSrcValue(const Value* I, int offset = 0);
void replaceAllUsesWith(SDOperand Old, SDOperand New) {
assert(Old != New && "RAUW self!");
assert(0 && "Unimplemented!");
}
void dump() const;
private:
void DeleteNodeIfDead(SDNode *N, void *NodeSet);
// Maps to auto-CSE operations.
std::map<std::pair<unsigned, std::pair<SDOperand, MVT::ValueType> >,
SDNode *> UnaryOps;
std::map<std::pair<unsigned, std::pair<SDOperand, SDOperand> >,
SDNode *> BinaryOps;
std::map<std::pair<std::pair<SDOperand, SDOperand>,
std::pair<ISD::CondCode, MVT::ValueType> >,
SetCCSDNode*> SetCCs;
std::map<std::pair<SDOperand, std::pair<SDOperand, MVT::ValueType> >,
SDNode *> Loads;
std::map<const GlobalValue*, SDNode*> GlobalValues;
std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> Constants;
std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> ConstantFPs;
std::map<int, SDNode*> FrameIndices;
std::map<unsigned, SDNode*> ConstantPoolIndices;
std::map<MachineBasicBlock *, SDNode*> BBNodes;
std::map<std::pair<unsigned,
std::pair<MVT::ValueType, std::vector<SDOperand> > >,
SDNode*> OneResultNodes;
std::map<std::pair<unsigned,
std::pair<std::vector<MVT::ValueType>,
std::vector<SDOperand> > >,
SDNode*> ArbitraryNodes;
std::map<std::string, SDNode*> ExternalSymbols;
struct EVTStruct {
unsigned Opcode;
MVT::ValueType VT, EVT;
std::vector<SDOperand> Ops;
bool operator<(const EVTStruct &RHS) const {
if (Opcode < RHS.Opcode) return true;
if (Opcode > RHS.Opcode) return false;
if (VT < RHS.VT) return true;
if (VT > RHS.VT) return false;
if (EVT < RHS.EVT) return true;
if (EVT > RHS.EVT) return false;
return Ops < RHS.Ops;
}
};
std::map<EVTStruct, SDNode*> MVTSDNodes;
};
template <> struct GraphTraits<SelectionDAG*> : public GraphTraits<SDNode*> {
typedef SelectionDAG::allnodes_iterator nodes_iterator;
static nodes_iterator nodes_begin(SelectionDAG *G) {
return G->allnodes_begin();
}
static nodes_iterator nodes_end(SelectionDAG *G) {
return G->allnodes_end();
}
};
}
#endif