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4fad513704
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1978 91177308-0d34-0410-b5e6-96231b3b80d8
119 lines
3.9 KiB
C++
119 lines
3.9 KiB
C++
// $Id$ -*-c++-*-
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//***************************************************************************
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// File:
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// InstrSelection.h
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//
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// Purpose:
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// External interface to instruction selection.
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//
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// History:
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// 7/02/01 - Vikram Adve - Created
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//**************************************************************************/
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#ifndef LLVM_CODEGEN_INSTR_SELECTION_H
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#define LLVM_CODEGEN_INSTR_SELECTION_H
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#include "llvm/Instruction.h"
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class Function;
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class InstrForest;
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class MachineInstr;
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class InstructionNode;
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class TargetMachine;
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/************************* Required Functions *******************************
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* Target-dependent functions that MUST be implemented for each target.
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***************************************************************************/
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const unsigned MAX_INSTR_PER_VMINSTR = 8;
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extern void GetInstructionsByRule (InstructionNode* subtreeRoot,
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int ruleForNode,
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short* nts,
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TargetMachine &Target,
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vector<MachineInstr*>& mvec);
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extern unsigned GetInstructionsForProlog(BasicBlock* entryBB,
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TargetMachine &Target,
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MachineInstr** minstrVec);
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extern unsigned GetInstructionsForEpilog(BasicBlock* anExitBB,
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TargetMachine &Target,
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MachineInstr** minstrVec);
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extern bool ThisIsAChainRule (int eruleno);
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//************************ Exported Functions ******************************/
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//---------------------------------------------------------------------------
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// Function: SelectInstructionsForMethod
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//
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// Purpose:
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// Entry point for instruction selection using BURG.
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// Returns true if instruction selection failed, false otherwise.
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// Implemented in machine-specific instruction selection file.
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//---------------------------------------------------------------------------
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bool SelectInstructionsForMethod (Function* function,
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TargetMachine &Target);
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//************************ Exported Data Types *****************************/
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//---------------------------------------------------------------------------
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// class TmpInstruction
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//
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// This class represents temporary intermediate values
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// used within the machine code for a VM instruction
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//---------------------------------------------------------------------------
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class TmpInstruction : public Instruction {
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TmpInstruction(const TmpInstruction &TI)
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: Instruction(TI.getType(), TI.getOpcode()) {
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if (!TI.Operands.empty()) {
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Operands.push_back(Use(TI.Operands[0], this));
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if (TI.Operands.size() == 2)
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Operands.push_back(Use(TI.Operands[1], this));
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else
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assert(0 && "Bad # operands to TmpInstruction!");
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}
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}
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public:
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// Constructor that uses the type of S1 as the type of the temporary.
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// s1 must be a valid value. s2 may be NULL.
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TmpInstruction(Value *s1, Value *s2 = 0, const std::string &name = "")
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: Instruction(s1->getType(), Instruction::UserOp1, name) {
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Operands.push_back(Use(s1, this)); // s1 must be nonnull
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if (s2) {
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Operands.push_back(Use(s2, this));
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}
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}
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// Constructor that requires the type of the temporary to be specified.
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// Both S1 and S2 may be NULL.
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TmpInstruction(const Type *Ty, Value *s1 = 0, Value* s2 = 0,
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const std::string &name = "")
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: Instruction(Ty, Instruction::UserOp1, name) {
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if (s1) { Operands.push_back(Use(s1, this)); }
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if (s2) { Operands.push_back(Use(s2, this)); }
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}
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virtual Instruction *clone() const { return new TmpInstruction(*this); }
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virtual const char *getOpcodeName() const {
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return "TempValueForMachineInstr";
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}
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const TmpInstruction *) { return true; }
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static inline bool classof(const Instruction *I) {
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return (I->getOpcode() == Instruction::UserOp1);
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}
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static inline bool classof(const Value *V) {
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return isa<Instruction>(V) && classof(cast<Instruction>(V));
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}
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};
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#endif
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