InstrInfoEmitter.cpp revision 58505994cfad64d89c7b3825341396faa10e6ea1
1//===- InstrInfoEmitter.cpp - Generate a Instruction Set Desc. ------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by the LLVM research group and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This tablegen backend is responsible for emitting a description of the target 11// instruction set for the code generator. 12// 13//===----------------------------------------------------------------------===// 14 15#include "InstrInfoEmitter.h" 16#include "CodeGenWrappers.h" 17#include "Record.h" 18 19namespace llvm { 20 21// runEnums - Print out enum values for all of the instructions. 22void InstrInfoEmitter::runEnums(std::ostream &OS) { 23 std::vector<Record*> Insts = Records.getAllDerivedDefinitions("Instruction"); 24 25 if (Insts.size() == 0) 26 throw std::string("No 'Instruction' subclasses defined!"); 27 28 std::string Namespace = Insts[0]->getValueAsString("Namespace"); 29 30 EmitSourceFileHeader("Target Instruction Enum Values", OS); 31 32 if (!Namespace.empty()) 33 OS << "namespace " << Namespace << " {\n"; 34 OS << " enum {\n"; 35 36 CodeGenTarget Target; 37 38 // We must emit the PHI opcode first... 39 Record *InstrInfo = Target.getInstructionSet(); 40 Record *PHI = InstrInfo->getValueAsDef("PHIInst"); 41 42 OS << " " << PHI->getName() << ", \t// 0 (fixed for all targets)\n"; 43 44 // Print out the rest of the instructions now... 45 for (unsigned i = 0, e = Insts.size(); i != e; ++i) 46 if (Insts[i] != PHI) 47 OS << " " << Insts[i]->getName() << ", \t// " << i+1 << "\n"; 48 49 OS << " };\n"; 50 if (!Namespace.empty()) 51 OS << "}\n"; 52 EmitSourceFileTail(OS); 53} 54 55void InstrInfoEmitter::printDefList(ListInit *LI, const std::string &Name, 56 std::ostream &OS) const { 57 OS << "static const unsigned " << Name << "[] = { "; 58 for (unsigned j = 0, e = LI->getSize(); j != e; ++j) 59 if (DefInit *DI = dynamic_cast<DefInit*>(LI->getElement(j))) 60 OS << getQualifiedName(DI->getDef()) << ", "; 61 else 62 throw "Illegal value in '" + Name + "' list!"; 63 OS << "0 };\n"; 64} 65 66 67// run - Emit the main instruction description records for the target... 68void InstrInfoEmitter::run(std::ostream &OS) { 69 EmitSourceFileHeader("Target Instruction Descriptors", OS); 70 CodeGenTarget Target; 71 const std::string &TargetName = Target.getName(); 72 Record *InstrInfo = Target.getInstructionSet(); 73 Record *PHI = InstrInfo->getValueAsDef("PHIInst"); 74 75 std::vector<Record*> Instructions = 76 Records.getAllDerivedDefinitions("Instruction"); 77 78 // Emit empty implicit uses and defs lists 79 OS << "static const unsigned EmptyImpUses[] = { 0 };\n" 80 << "static const unsigned EmptyImpDefs[] = { 0 };\n"; 81 82 // Emit all of the instruction's implicit uses and defs... 83 for (unsigned i = 0, e = Instructions.size(); i != e; ++i) { 84 Record *Inst = Instructions[i]; 85 ListInit *LI = Inst->getValueAsListInit("Uses"); 86 if (LI->getSize()) printDefList(LI, Inst->getName()+"ImpUses", OS); 87 LI = Inst->getValueAsListInit("Defs"); 88 if (LI->getSize()) printDefList(LI, Inst->getName()+"ImpDefs", OS); 89 } 90 91 OS << "\nstatic const TargetInstrDescriptor " << TargetName 92 << "Insts[] = {\n"; 93 emitRecord(PHI, 0, InstrInfo, OS); 94 95 for (unsigned i = 0, e = Instructions.size(); i != e; ++i) 96 if (Instructions[i] != PHI) 97 emitRecord(Instructions[i], i+1, InstrInfo, OS); 98 OS << "};\n"; 99 EmitSourceFileTail(OS); 100} 101 102void InstrInfoEmitter::emitRecord(Record *R, unsigned Num, Record *InstrInfo, 103 std::ostream &OS) { 104 OS << " { \"" << R->getValueAsString("Name") 105 << "\",\t-1, -1, 0, false, 0, 0, 0, 0"; 106 107 // Emit all of the target indepedent flags... 108 if (R->getValueAsBit("isReturn")) OS << "|M_RET_FLAG"; 109 if (R->getValueAsBit("isBranch")) OS << "|M_BRANCH_FLAG"; 110 if (R->getValueAsBit("isBarrier")) OS << "|M_BARRIER_FLAG"; 111 if (R->getValueAsBit("isCall" )) OS << "|M_CALL_FLAG"; 112 if (R->getValueAsBit("isTwoAddress")) OS << "|M_2_ADDR_FLAG"; 113 if (R->getValueAsBit("isTerminator")) OS << "|M_TERMINATOR_FLAG"; 114 OS << ", 0"; 115 116 // Emit all of the target-specific flags... 117 ListInit *LI = InstrInfo->getValueAsListInit("TSFlagsFields"); 118 ListInit *Shift = InstrInfo->getValueAsListInit("TSFlagsShifts"); 119 if (LI->getSize() != Shift->getSize()) 120 throw "Lengths of " + InstrInfo->getName() + 121 ":(TargetInfoFields, TargetInfoPositions) must be equal!"; 122 123 for (unsigned i = 0, e = LI->getSize(); i != e; ++i) 124 emitShiftedValue(R, dynamic_cast<StringInit*>(LI->getElement(i)), 125 dynamic_cast<IntInit*>(Shift->getElement(i)), OS); 126 127 OS << ", "; 128 129 // Emit the implicit uses and defs lists... 130 LI = R->getValueAsListInit("Uses"); 131 if (!LI->getSize()) 132 OS << "EmptyImpUses, "; 133 else 134 OS << R->getName() << "ImpUses, "; 135 136 LI = R->getValueAsListInit("Defs"); 137 if (!LI->getSize()) 138 OS << "EmptyImpDefs "; 139 else 140 OS << R->getName() << "ImpDefs "; 141 142 OS << " }, // Inst #" << Num << " = " << R->getName() << "\n"; 143} 144 145void InstrInfoEmitter::emitShiftedValue(Record *R, StringInit *Val, 146 IntInit *ShiftInt, std::ostream &OS) { 147 if (Val == 0 || ShiftInt == 0) 148 throw std::string("Illegal value or shift amount in TargetInfo*!"); 149 RecordVal *RV = R->getValue(Val->getValue()); 150 int Shift = ShiftInt->getValue(); 151 152 if (RV == 0 || RV->getValue() == 0) 153 throw R->getName() + " doesn't have a field named '" + Val->getValue()+"'!"; 154 155 Init *Value = RV->getValue(); 156 if (BitInit *BI = dynamic_cast<BitInit*>(Value)) { 157 if (BI->getValue()) OS << "|(1<<" << Shift << ")"; 158 return; 159 } else if (BitsInit *BI = dynamic_cast<BitsInit*>(Value)) { 160 // Convert the Bits to an integer to print... 161 Init *I = BI->convertInitializerTo(new IntRecTy()); 162 if (I) 163 if (IntInit *II = dynamic_cast<IntInit*>(I)) { 164 if (II->getValue()) 165 OS << "|(" << II->getValue() << "<<" << Shift << ")"; 166 return; 167 } 168 169 } else if (IntInit *II = dynamic_cast<IntInit*>(Value)) { 170 if (II->getValue()) OS << "|(" << II->getValue() << "<<" << Shift << ")"; 171 return; 172 } 173 174 std::cerr << "Unhandled initializer: " << *Val << "\n"; 175 throw "In record '" + R->getName() + "' for TSFlag emission."; 176} 177 178} // End llvm namespace 179