InstrInfoEmitter.cpp revision 01d45827a1e512f3b19ba857772bf02baa3c0c4e
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 19// runEnums - Print out enum values for all of the instructions. 20void InstrInfoEmitter::runEnums(std::ostream &OS) { 21 std::vector<Record*> Insts = Records.getAllDerivedDefinitions("Instruction"); 22 23 if (Insts.size() == 0) 24 throw std::string("No 'Instruction' subclasses defined!"); 25 26 std::string Namespace = Insts[0]->getValueAsString("Namespace"); 27 28 EmitSourceFileHeader("Target Instruction Enum Values", OS); 29 30 if (!Namespace.empty()) 31 OS << "namespace " << Namespace << " {\n"; 32 OS << " enum {\n"; 33 34 CodeGenTarget Target; 35 36 // We must emit the PHI opcode first... 37 Record *InstrInfo = Target.getInstructionSet(); 38 Record *PHI = InstrInfo->getValueAsDef("PHIInst"); 39 40 OS << " " << PHI->getName() << ", \t// 0 (fixed for all targets)\n"; 41 42 // Print out the rest of the instructions now... 43 for (unsigned i = 0, e = Insts.size(); i != e; ++i) 44 if (Insts[i] != PHI) 45 OS << " " << Insts[i]->getName() << ", \t// " << i+1 << "\n"; 46 47 OS << " };\n"; 48 if (!Namespace.empty()) 49 OS << "}\n"; 50} 51 52void InstrInfoEmitter::printDefList(ListInit *LI, const std::string &Name, 53 std::ostream &OS) const { 54 OS << "static const unsigned " << Name << "[] = { "; 55 for (unsigned j = 0, e = LI->getSize(); j != e; ++j) 56 if (DefInit *DI = dynamic_cast<DefInit*>(LI->getElement(j))) 57 OS << getQualifiedName(DI->getDef()) << ", "; 58 else 59 throw "Illegal value in '" + Name + "' list!"; 60 OS << "0 };\n"; 61} 62 63 64// run - Emit the main instruction description records for the target... 65void InstrInfoEmitter::run(std::ostream &OS) { 66 EmitSourceFileHeader("Target Instruction Descriptors", OS); 67 CodeGenTarget Target; 68 const std::string &TargetName = Target.getName(); 69 Record *InstrInfo = Target.getInstructionSet(); 70 Record *PHI = InstrInfo->getValueAsDef("PHIInst"); 71 72 std::vector<Record*> Instructions = 73 Records.getAllDerivedDefinitions("Instruction"); 74 75 // Emit empty implicit uses and defs lists 76 OS << "static const unsigned EmptyImpUses[] = { 0 };\n" 77 << "static const unsigned EmptyImpDefs[] = { 0 };\n"; 78 79 // Emit all of the instruction's implicit uses and defs... 80 for (unsigned i = 0, e = Instructions.size(); i != e; ++i) { 81 Record *Inst = Instructions[i]; 82 ListInit *LI = Inst->getValueAsListInit("Uses"); 83 if (LI->getSize()) printDefList(LI, Inst->getName()+"ImpUses", OS); 84 LI = Inst->getValueAsListInit("Defs"); 85 if (LI->getSize()) printDefList(LI, Inst->getName()+"ImpDefs", OS); 86 } 87 88 OS << "\nstatic const TargetInstrDescriptor " << TargetName 89 << "Insts[] = {\n"; 90 emitRecord(PHI, 0, InstrInfo, OS); 91 92 for (unsigned i = 0, e = Instructions.size(); i != e; ++i) 93 if (Instructions[i] != PHI) 94 emitRecord(Instructions[i], i+1, InstrInfo, OS); 95 OS << "};\n"; 96} 97 98void InstrInfoEmitter::emitRecord(Record *R, unsigned Num, Record *InstrInfo, 99 std::ostream &OS) { 100 OS << " { \"" << R->getValueAsString("Name") 101 << "\",\t-1, -1, 0, false, 0, 0, 0, 0"; 102 103 // Emit all of the target indepedent flags... 104 if (R->getValueAsBit("isReturn")) OS << "|M_RET_FLAG"; 105 if (R->getValueAsBit("isBranch")) OS << "|M_BRANCH_FLAG"; 106 if (R->getValueAsBit("isCall" )) OS << "|M_CALL_FLAG"; 107 if (R->getValueAsBit("isTwoAddress")) OS << "|M_2_ADDR_FLAG"; 108 if (R->getValueAsBit("isTerminator")) OS << "|M_TERMINATOR_FLAG"; 109 OS << ", 0"; 110 111 // Emit all of the target-specific flags... 112 ListInit *LI = InstrInfo->getValueAsListInit("TSFlagsFields"); 113 ListInit *Shift = InstrInfo->getValueAsListInit("TSFlagsShifts"); 114 if (LI->getSize() != Shift->getSize()) 115 throw "Lengths of " + InstrInfo->getName() + 116 ":(TargetInfoFields, TargetInfoPositions) must be equal!"; 117 118 for (unsigned i = 0, e = LI->getSize(); i != e; ++i) 119 emitShiftedValue(R, dynamic_cast<StringInit*>(LI->getElement(i)), 120 dynamic_cast<IntInit*>(Shift->getElement(i)), OS); 121 122 OS << ", "; 123 124 // Emit the implicit uses and defs lists... 125 LI = R->getValueAsListInit("Uses"); 126 if (!LI->getSize()) 127 OS << "EmptyImpUses, "; 128 else 129 OS << R->getName() << "ImpUses, "; 130 131 LI = R->getValueAsListInit("Defs"); 132 if (!LI->getSize()) 133 OS << "EmptyImpDefs "; 134 else 135 OS << R->getName() << "ImpDefs "; 136 137 OS << " }, // Inst #" << Num << " = " << R->getName() << "\n"; 138} 139 140void InstrInfoEmitter::emitShiftedValue(Record *R, StringInit *Val, 141 IntInit *ShiftInt, std::ostream &OS) { 142 if (Val == 0 || ShiftInt == 0) 143 throw std::string("Illegal value or shift amount in TargetInfo*!"); 144 RecordVal *RV = R->getValue(Val->getValue()); 145 int Shift = ShiftInt->getValue(); 146 147 if (RV == 0 || RV->getValue() == 0) 148 throw R->getName() + " doesn't have a field named '" + Val->getValue()+"'!"; 149 150 Init *Value = RV->getValue(); 151 if (BitInit *BI = dynamic_cast<BitInit*>(Value)) { 152 if (BI->getValue()) OS << "|(1<<" << Shift << ")"; 153 return; 154 } else if (BitsInit *BI = dynamic_cast<BitsInit*>(Value)) { 155 // Convert the Bits to an integer to print... 156 Init *I = BI->convertInitializerTo(new IntRecTy()); 157 if (I) 158 if (IntInit *II = dynamic_cast<IntInit*>(I)) { 159 if (II->getValue()) 160 OS << "|(" << II->getValue() << "<<" << Shift << ")"; 161 return; 162 } 163 164 } else if (IntInit *II = dynamic_cast<IntInit*>(Value)) { 165 if (II->getValue()) OS << "|(" << II->getValue() << "<<" << Shift << ")"; 166 return; 167 } 168 169 std::cerr << "Unhandled initializer: " << *Val << "\n"; 170 throw "In record '" + R->getName() + "' for TSFlag emission."; 171} 172