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