InstrInfoEmitter.cpp revision 5b71d3af35f941585acb50de4909cff20f68680d
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 Record *PHI = InstrInfo->getValueAsDef("PHIInst"); 30 31 std::string Namespace = Target.inst_begin()->second.Namespace; 32 33 if (!Namespace.empty()) 34 OS << "namespace " << Namespace << " {\n"; 35 OS << " enum {\n"; 36 37 OS << " " << PHI->getName() << ", \t// 0 (fixed for all targets)\n"; 38 39 // Print out the rest of the instructions now. 40 unsigned i = 0; 41 for (CodeGenTarget::inst_iterator II = Target.inst_begin(), 42 E = Target.inst_end(); II != E; ++II) 43 if (II->second.TheDef != PHI) 44 OS << " " << II->first << ", \t// " << ++i << "\n"; 45 46 OS << " };\n"; 47 if (!Namespace.empty()) 48 OS << "}\n"; 49 OS << "} // End llvm namespace \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 OS << "namespace llvm {\n\n"; 68 69 CodeGenTarget Target; 70 const std::string &TargetName = Target.getName(); 71 Record *InstrInfo = Target.getInstructionSet(); 72 Record *PHI = InstrInfo->getValueAsDef("PHIInst"); 73 74 // Emit empty implicit uses and defs lists 75 OS << "static const unsigned EmptyImpUses[] = { 0 };\n" 76 << "static const unsigned EmptyImpDefs[] = { 0 };\n"; 77 78 // Emit all of the instruction's implicit uses and defs... 79 for (CodeGenTarget::inst_iterator II = Target.inst_begin(), 80 E = Target.inst_end(); II != E; ++II) { 81 Record *Inst = II->second.TheDef; 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(Target.getPHIInstruction(), 0, InstrInfo, OS); 91 92 unsigned i = 0; 93 for (CodeGenTarget::inst_iterator II = Target.inst_begin(), 94 E = Target.inst_end(); II != E; ++II) 95 if (II->second.TheDef != PHI) 96 emitRecord(II->second, ++i, InstrInfo, OS); 97 OS << "};\n"; 98 OS << "} // End llvm namespace \n"; 99} 100 101void InstrInfoEmitter::emitRecord(const CodeGenInstruction &Inst, unsigned Num, 102 Record *InstrInfo, std::ostream &OS) { 103 OS << " { \""; 104 if (Inst.Name.empty()) 105 OS << Inst.TheDef->getName(); 106 else 107 OS << Inst.Name; 108 OS << "\",\t-1, -1, 0, false, 0, 0, 0, 0"; 109 110 // Emit all of the target indepedent flags... 111 if (Inst.isReturn) OS << "|M_RET_FLAG"; 112 if (Inst.isBranch) OS << "|M_BRANCH_FLAG"; 113 if (Inst.isBarrier) OS << "|M_BARRIER_FLAG"; 114 if (Inst.hasDelaySlot) OS << "|M_DELAY_SLOT_FLAG"; 115 if (Inst.isCall) OS << "|M_CALL_FLAG"; 116 if (Inst.isTwoAddress) OS << "|M_2_ADDR_FLAG"; 117 if (Inst.isTerminator) OS << "|M_TERMINATOR_FLAG"; 118 OS << ", 0"; 119 120 // Emit all of the target-specific flags... 121 ListInit *LI = InstrInfo->getValueAsListInit("TSFlagsFields"); 122 ListInit *Shift = InstrInfo->getValueAsListInit("TSFlagsShifts"); 123 if (LI->getSize() != Shift->getSize()) 124 throw "Lengths of " + InstrInfo->getName() + 125 ":(TargetInfoFields, TargetInfoPositions) must be equal!"; 126 127 for (unsigned i = 0, e = LI->getSize(); i != e; ++i) 128 emitShiftedValue(Inst.TheDef, dynamic_cast<StringInit*>(LI->getElement(i)), 129 dynamic_cast<IntInit*>(Shift->getElement(i)), OS); 130 131 OS << ", "; 132 133 // Emit the implicit uses and defs lists... 134 LI = Inst.TheDef->getValueAsListInit("Uses"); 135 if (!LI->getSize()) 136 OS << "EmptyImpUses, "; 137 else 138 OS << Inst.TheDef->getName() << "ImpUses, "; 139 140 LI = Inst.TheDef->getValueAsListInit("Defs"); 141 if (!LI->getSize()) 142 OS << "EmptyImpDefs "; 143 else 144 OS << Inst.TheDef->getName() << "ImpDefs "; 145 146 OS << " }, // Inst #" << Num << " = " << Inst.TheDef->getName() << "\n"; 147} 148 149void InstrInfoEmitter::emitShiftedValue(Record *R, StringInit *Val, 150 IntInit *ShiftInt, std::ostream &OS) { 151 if (Val == 0 || ShiftInt == 0) 152 throw std::string("Illegal value or shift amount in TargetInfo*!"); 153 RecordVal *RV = R->getValue(Val->getValue()); 154 int Shift = ShiftInt->getValue(); 155 156 if (RV == 0 || RV->getValue() == 0) 157 throw R->getName() + " doesn't have a field named '" + Val->getValue()+"'!"; 158 159 Init *Value = RV->getValue(); 160 if (BitInit *BI = dynamic_cast<BitInit*>(Value)) { 161 if (BI->getValue()) OS << "|(1<<" << Shift << ")"; 162 return; 163 } else if (BitsInit *BI = dynamic_cast<BitsInit*>(Value)) { 164 // Convert the Bits to an integer to print... 165 Init *I = BI->convertInitializerTo(new IntRecTy()); 166 if (I) 167 if (IntInit *II = dynamic_cast<IntInit*>(I)) { 168 if (II->getValue()) 169 OS << "|(" << II->getValue() << "<<" << Shift << ")"; 170 return; 171 } 172 173 } else if (IntInit *II = dynamic_cast<IntInit*>(Value)) { 174 if (II->getValue()) OS << "|(" << II->getValue() << "<<" << Shift << ")"; 175 return; 176 } 177 178 std::cerr << "Unhandled initializer: " << *Val << "\n"; 179 throw "In record '" + R->getName() + "' for TSFlag emission."; 180} 181 182