1 //===- InstrInfoEmitter.cpp - Generate a Instruction Set Desc. ------------===//
3 // The LLVM Compiler Infrastructure
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.
8 //===----------------------------------------------------------------------===//
10 // This tablegen backend is responsible for emitting a description of the target
11 // instruction set for the code generator.
13 //===----------------------------------------------------------------------===//
15 #include "InstrInfoEmitter.h"
16 #include "CodeGenTarget.h"
20 // runEnums - Print out enum values for all of the instructions.
21 void InstrInfoEmitter::runEnums(std::ostream &OS) {
22 EmitSourceFileHeader("Target Instruction Enum Values", OS);
26 // We must emit the PHI opcode first...
27 Record *InstrInfo = Target.getInstructionSet();
28 Record *PHI = InstrInfo->getValueAsDef("PHIInst");
30 std::string Namespace = Target.inst_begin()->second.Namespace;
32 if (!Namespace.empty())
33 OS << "namespace " << Namespace << " {\n";
36 OS << " " << PHI->getName() << ", \t// 0 (fixed for all targets)\n";
38 // Print out the rest of the instructions now.
40 for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
41 E = Target.inst_end(); II != E; ++II)
42 if (II->second.TheDef != PHI)
43 OS << " " << II->first << ", \t// " << ++i << "\n";
46 if (!Namespace.empty())
48 EmitSourceFileTail(OS);
51 void InstrInfoEmitter::printDefList(ListInit *LI, const std::string &Name,
52 std::ostream &OS) const {
53 OS << "static const unsigned " << Name << "[] = { ";
54 for (unsigned j = 0, e = LI->getSize(); j != e; ++j)
55 if (DefInit *DI = dynamic_cast<DefInit*>(LI->getElement(j)))
56 OS << getQualifiedName(DI->getDef()) << ", ";
58 throw "Illegal value in '" + Name + "' list!";
63 // run - Emit the main instruction description records for the target...
64 void InstrInfoEmitter::run(std::ostream &OS) {
65 EmitSourceFileHeader("Target Instruction Descriptors", OS);
67 const std::string &TargetName = Target.getName();
68 Record *InstrInfo = Target.getInstructionSet();
69 Record *PHI = InstrInfo->getValueAsDef("PHIInst");
71 // Emit empty implicit uses and defs lists
72 OS << "static const unsigned EmptyImpUses[] = { 0 };\n"
73 << "static const unsigned EmptyImpDefs[] = { 0 };\n";
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);
85 OS << "\nstatic const TargetInstrDescriptor " << TargetName
87 emitRecord(Target.getPHIInstruction(), 0, InstrInfo, OS);
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);
95 EmitSourceFileTail(OS);
98 void InstrInfoEmitter::emitRecord(const CodeGenInstruction &Inst, unsigned Num,
99 Record *InstrInfo, std::ostream &OS) {
101 if (Inst.Name.empty())
102 OS << Inst.TheDef->getName();
105 OS << "\",\t-1, -1, 0, false, 0, 0, 0, 0";
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.isCall) OS << "|M_CALL_FLAG";
112 if (Inst.isTwoAddress) OS << "|M_2_ADDR_FLAG";
113 if (Inst.isTerminator) OS << "|M_TERMINATOR_FLAG";
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!";
123 for (unsigned i = 0, e = LI->getSize(); i != e; ++i)
124 emitShiftedValue(Inst.TheDef, dynamic_cast<StringInit*>(LI->getElement(i)),
125 dynamic_cast<IntInit*>(Shift->getElement(i)), OS);
129 // Emit the implicit uses and defs lists...
130 LI = Inst.TheDef->getValueAsListInit("Uses");
132 OS << "EmptyImpUses, ";
134 OS << Inst.TheDef->getName() << "ImpUses, ";
136 LI = Inst.TheDef->getValueAsListInit("Defs");
138 OS << "EmptyImpDefs ";
140 OS << Inst.TheDef->getName() << "ImpDefs ";
142 OS << " }, // Inst #" << Num << " = " << Inst.TheDef->getName() << "\n";
145 void 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();
152 if (RV == 0 || RV->getValue() == 0)
153 throw R->getName() + " doesn't have a field named '" + Val->getValue()+"'!";
155 Init *Value = RV->getValue();
156 if (BitInit *BI = dynamic_cast<BitInit*>(Value)) {
157 if (BI->getValue()) OS << "|(1<<" << Shift << ")";
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());
163 if (IntInit *II = dynamic_cast<IntInit*>(I)) {
165 OS << "|(" << II->getValue() << "<<" << Shift << ")";
169 } else if (IntInit *II = dynamic_cast<IntInit*>(Value)) {
170 if (II->getValue()) OS << "|(" << II->getValue() << "<<" << Shift << ")";
174 std::cerr << "Unhandled initializer: " << *Val << "\n";
175 throw "In record '" + R->getName() + "' for TSFlag emission.";