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122 lines
3.8 KiB
C++
122 lines
3.8 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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//
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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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//************************** System Include Files **************************/
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//*************************** User Include Files ***************************/
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#include "llvm/Instruction.h"
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//************************* Opaque Declarations ****************************/
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class CompileContext;
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class Instruction;
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class Method;
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class InstrForest;
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class MachineInstruction;
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class TmpInstruction;
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//************************ Exported Constants ******************************/
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const int DEBUG_INSTR_TREES = 2;
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const int DEBUG_BURG_TREES = 5;
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//****************** External Function Prototypes **************************/
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//---------------------------------------------------------------------------
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// GLOBAL data and an external function that must be implemented
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// for each architecture.
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//---------------------------------------------------------------------------
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const unsigned MAX_INSTR_PER_VMINSTR = 8;
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extern unsigned GetInstructionsByRule (InstructionNode* subtreeRoot,
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int ruleForNode,
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short* nts,
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CompileContext& ccontext,
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MachineInstr** minstrVec);
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extern bool ThisIsAChainRule (int eruleno);
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//************************ Exported Data Types *****************************/
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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 (Method* method,
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CompileContext& ccontext);
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// Debugging function to print the generated instructions
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void PrintMachineInstructions (Method* method,
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CompileContext& ccontext);
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//---------------------------------------------------------------------------
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// Function: FoldGetElemChain
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//
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// Purpose:
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// Fold a chain of GetElementPtr instructions into an equivalent
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// (Pointer, IndexVector) pair. Returns the pointer Value, and
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// stores the resulting IndexVector in argument chainIdxVec.
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//---------------------------------------------------------------------------
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Value* FoldGetElemChain (const InstructionNode* getElemInstrNode,
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vector<ConstPoolVal*>& chainIdxVec);
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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 &CI) : Instruction(CI.getType(), CI.getOpcode()) {
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Operands.reserve(2);
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Operands.push_back(Use(Operands[0], this));
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Operands.push_back(Use(Operands[1], this));
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}
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public:
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TmpInstruction(OtherOps Opcode, Value *S1, Value* S2, const string &Name = "")
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: Instruction(S1->getType(), Opcode, Name)
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{
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assert(Opcode == UserOp1 && "Tmp instruction opcode invalid!");
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Operands.reserve(S2? 2 : 1);
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Operands.push_back(Use(S1, this));
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if (S2)
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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 "userOp1";
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}
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};
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//**************************************************************************/
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#endif
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