InstrInfoEmitter.cpp revision d6488671736d0a5aaee1218748b94d8c68f33716
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 "CodeGenTarget.h" 17#include "Record.h" 18using namespace llvm; 19 20// runEnums - Print out enum values for all of the instructions. 21void InstrInfoEmitter::runEnums(std::ostream &OS) { 22 EmitSourceFileHeader("Target Instruction Enum Values", OS); 23 OS << "namespace llvm {\n\n"; 24 25 CodeGenTarget Target; 26 27 // We must emit the PHI opcode first... 28 Record *InstrInfo = Target.getInstructionSet(); 29 30 std::string Namespace = Target.inst_begin()->second.Namespace; 31 32 if (!Namespace.empty()) 33 OS << "namespace " << Namespace << " {\n"; 34 OS << " enum {\n"; 35 36 std::vector<const CodeGenInstruction*> NumberedInstructions; 37 Target.getInstructionsByEnumValue(NumberedInstructions); 38 39 for (unsigned i = 0, e = NumberedInstructions.size(); i != e; ++i) { 40 OS << " " << NumberedInstructions[i]->TheDef->getName() 41 << ", \t// " << i << "\n"; 42 } 43 OS << " };\n"; 44 if (!Namespace.empty()) 45 OS << "}\n"; 46 OS << "} // End llvm namespace \n"; 47} 48 49void InstrInfoEmitter::printDefList(ListInit *LI, const std::string &Name, 50 std::ostream &OS) const { 51 OS << "static const unsigned " << Name << "[] = { "; 52 for (unsigned j = 0, e = LI->getSize(); j != e; ++j) 53 if (DefInit *DI = dynamic_cast<DefInit*>(LI->getElement(j))) 54 OS << getQualifiedName(DI->getDef()) << ", "; 55 else 56 throw "Illegal value in '" + Name + "' list!"; 57 OS << "0 };\n"; 58} 59 60 61// run - Emit the main instruction description records for the target... 62void InstrInfoEmitter::run(std::ostream &OS) { 63 EmitSourceFileHeader("Target Instruction Descriptors", OS); 64 OS << "namespace llvm {\n\n"; 65 66 CodeGenTarget Target; 67 const std::string &TargetName = Target.getName(); 68 Record *InstrInfo = Target.getInstructionSet(); 69 Record *PHI = InstrInfo->getValueAsDef("PHIInst"); 70 71 // Emit empty implicit uses and defs lists 72 OS << "static const unsigned EmptyImpUses[] = { 0 };\n" 73 << "static const unsigned EmptyImpDefs[] = { 0 };\n"; 74 75 // Emit all of the instruction's implicit uses and defs... 76 for (CodeGenTarget::inst_iterator II = Target.inst_begin(), 77 E = Target.inst_end(); II != E; ++II) { 78 Record *Inst = II->second.TheDef; 79 ListInit *LI = Inst->getValueAsListInit("Uses"); 80 if (LI->getSize()) printDefList(LI, Inst->getName()+"ImpUses", OS); 81 LI = Inst->getValueAsListInit("Defs"); 82 if (LI->getSize()) printDefList(LI, Inst->getName()+"ImpDefs", OS); 83 } 84 85 OS << "\nstatic const TargetInstrDescriptor " << TargetName 86 << "Insts[] = {\n"; 87 emitRecord(Target.getPHIInstruction(), 0, InstrInfo, OS); 88 89 unsigned i = 0; 90 for (CodeGenTarget::inst_iterator II = Target.inst_begin(), 91 E = Target.inst_end(); II != E; ++II) 92 if (II->second.TheDef != PHI) 93 emitRecord(II->second, ++i, InstrInfo, OS); 94 OS << "};\n"; 95 OS << "} // End llvm namespace \n"; 96} 97 98void InstrInfoEmitter::emitRecord(const CodeGenInstruction &Inst, unsigned Num, 99 Record *InstrInfo, std::ostream &OS) { 100 OS << " { \""; 101 if (Inst.Name.empty()) 102 OS << Inst.TheDef->getName(); 103 else 104 OS << Inst.Name; 105 OS << "\",\t-1, -1, 0, false, 0, 0, 0, 0"; 106 107 // Emit all of the target indepedent flags... 108 if (Inst.isReturn) OS << "|M_RET_FLAG"; 109 if (Inst.isBranch) OS << "|M_BRANCH_FLAG"; 110 if (Inst.isBarrier) OS << "|M_BARRIER_FLAG"; 111 if (Inst.hasDelaySlot) OS << "|M_DELAY_SLOT_FLAG"; 112 if (Inst.isCall) OS << "|M_CALL_FLAG"; 113 if (Inst.isLoad) OS << "|M_LOAD_FLAG"; 114 if (Inst.isStore) OS << "|M_STORE_FLAG"; 115 if (Inst.isTwoAddress) OS << "|M_2_ADDR_FLAG"; 116 if (Inst.isConvertibleToThreeAddress) OS << "|M_CONVERTIBLE_TO_3_ADDR"; 117 if (Inst.isCommutable) OS << "|M_COMMUTABLE"; 118 if (Inst.isTerminator) OS << "|M_TERMINATOR_FLAG"; 119 OS << ", 0"; 120 121 // Emit all of the target-specific flags... 122 ListInit *LI = InstrInfo->getValueAsListInit("TSFlagsFields"); 123 ListInit *Shift = InstrInfo->getValueAsListInit("TSFlagsShifts"); 124 if (LI->getSize() != Shift->getSize()) 125 throw "Lengths of " + InstrInfo->getName() + 126 ":(TargetInfoFields, TargetInfoPositions) must be equal!"; 127 128 for (unsigned i = 0, e = LI->getSize(); i != e; ++i) 129 emitShiftedValue(Inst.TheDef, dynamic_cast<StringInit*>(LI->getElement(i)), 130 dynamic_cast<IntInit*>(Shift->getElement(i)), OS); 131 132 OS << ", "; 133 134 // Emit the implicit uses and defs lists... 135 LI = Inst.TheDef->getValueAsListInit("Uses"); 136 if (!LI->getSize()) 137 OS << "EmptyImpUses, "; 138 else 139 OS << Inst.TheDef->getName() << "ImpUses, "; 140 141 LI = Inst.TheDef->getValueAsListInit("Defs"); 142 if (!LI->getSize()) 143 OS << "EmptyImpDefs "; 144 else 145 OS << Inst.TheDef->getName() << "ImpDefs "; 146 147 OS << " }, // Inst #" << Num << " = " << Inst.TheDef->getName() << "\n"; 148} 149 150void InstrInfoEmitter::emitShiftedValue(Record *R, StringInit *Val, 151 IntInit *ShiftInt, std::ostream &OS) { 152 if (Val == 0 || ShiftInt == 0) 153 throw std::string("Illegal value or shift amount in TargetInfo*!"); 154 RecordVal *RV = R->getValue(Val->getValue()); 155 int Shift = ShiftInt->getValue(); 156 157 if (RV == 0 || RV->getValue() == 0) 158 throw R->getName() + " doesn't have a field named '" + Val->getValue()+"'!"; 159 160 Init *Value = RV->getValue(); 161 if (BitInit *BI = dynamic_cast<BitInit*>(Value)) { 162 if (BI->getValue()) OS << "|(1<<" << Shift << ")"; 163 return; 164 } else if (BitsInit *BI = dynamic_cast<BitsInit*>(Value)) { 165 // Convert the Bits to an integer to print... 166 Init *I = BI->convertInitializerTo(new IntRecTy()); 167 if (I) 168 if (IntInit *II = dynamic_cast<IntInit*>(I)) { 169 if (II->getValue()) 170 OS << "|(" << II->getValue() << "<<" << Shift << ")"; 171 return; 172 } 173 174 } else if (IntInit *II = dynamic_cast<IntInit*>(Value)) { 175 if (II->getValue()) OS << "|(" << II->getValue() << "<<" << Shift << ")"; 176 return; 177 } 178 179 std::cerr << "Unhandled initializer: " << *Val << "\n"; 180 throw "In record '" + R->getName() + "' for TSFlag emission."; 181} 182 183