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