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);
23 OS << "namespace llvm {\n\n";
27 // We must emit the PHI opcode first...
28 Record *InstrInfo = Target.getInstructionSet();
30 std::string Namespace = Target.inst_begin()->second.Namespace;
32 if (!Namespace.empty())
33 OS << "namespace " << Namespace << " {\n";
36 std::vector<const CodeGenInstruction*> NumberedInstructions;
37 Target.getInstructionsByEnumValue(NumberedInstructions);
39 for (unsigned i = 0, e = NumberedInstructions.size(); i != e; ++i) {
40 OS << " " << NumberedInstructions[i]->TheDef->getName()
41 << ", \t// " << i << "\n";
44 if (!Namespace.empty())
46 OS << "} // End llvm namespace \n";
49 static std::vector<Record*> GetDefList(ListInit *LI, const std::string &Name) {
50 std::vector<Record*> Result;
51 for (unsigned i = 0, e = LI->getSize(); i != e; ++i)
52 if (DefInit *DI = dynamic_cast<DefInit*>(LI->getElement(i)))
53 Result.push_back(DI->getDef());
55 throw "Illegal value in '" + Name + "' list!";
59 void InstrInfoEmitter::printDefList(const std::vector<Record*> &Uses,
60 unsigned Num, std::ostream &OS) const {
61 OS << "static const unsigned ImplicitList" << Num << "[] = { ";
62 for (unsigned i = 0, e = Uses.size(); i != e; ++i)
63 OS << getQualifiedName(Uses[i]) << ", ";
68 // run - Emit the main instruction description records for the target...
69 void InstrInfoEmitter::run(std::ostream &OS) {
70 EmitSourceFileHeader("Target Instruction Descriptors", OS);
71 OS << "namespace llvm {\n\n";
74 const std::string &TargetName = Target.getName();
75 Record *InstrInfo = Target.getInstructionSet();
76 Record *PHI = InstrInfo->getValueAsDef("PHIInst");
78 // Emit empty implicit uses and defs lists
79 OS << "static const unsigned EmptyImpList[] = { 0 };\n";
81 // Keep track of all of the def lists we have emitted already.
82 std::map<std::vector<Record*>, unsigned> EmittedLists;
83 std::map<ListInit*, unsigned> ListNumbers;
84 unsigned ListNumber = 0;
86 // Emit all of the instruction's implicit uses and defs.
87 for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
88 E = Target.inst_end(); II != E; ++II) {
89 Record *Inst = II->second.TheDef;
90 ListInit *LI = Inst->getValueAsListInit("Uses");
92 std::vector<Record*> Uses = GetDefList(LI, Inst->getName());
93 unsigned &IL = EmittedLists[Uses];
94 if (!IL) printDefList(Uses, IL = ++ListNumber, OS);
97 LI = Inst->getValueAsListInit("Defs");
99 std::vector<Record*> Uses = GetDefList(LI, Inst->getName());
100 unsigned &IL = EmittedLists[Uses];
101 if (!IL) printDefList(Uses, IL = ++ListNumber, OS);
102 ListNumbers[LI] = IL;
106 OS << "\nstatic const TargetInstrDescriptor " << TargetName
108 emitRecord(Target.getPHIInstruction(), 0, InstrInfo, ListNumbers, OS);
111 for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
112 E = Target.inst_end(); II != E; ++II)
113 if (II->second.TheDef != PHI)
114 emitRecord(II->second, ++i, InstrInfo, ListNumbers, OS);
116 OS << "} // End llvm namespace \n";
119 void InstrInfoEmitter::emitRecord(const CodeGenInstruction &Inst, unsigned Num,
121 std::map<ListInit*, unsigned> &ListNumbers,
124 if (Inst.Name.empty())
125 OS << Inst.TheDef->getName();
129 //Inst.OperandList.size()
130 << ", -1, 0, false, 0, 0, 0, 0";
132 // Emit all of the target indepedent flags...
133 if (Inst.isReturn) OS << "|M_RET_FLAG";
134 if (Inst.isBranch) OS << "|M_BRANCH_FLAG";
135 if (Inst.isBarrier) OS << "|M_BARRIER_FLAG";
136 if (Inst.hasDelaySlot) OS << "|M_DELAY_SLOT_FLAG";
137 if (Inst.isCall) OS << "|M_CALL_FLAG";
138 if (Inst.isLoad) OS << "|M_LOAD_FLAG";
139 if (Inst.isStore) OS << "|M_STORE_FLAG";
140 if (Inst.isTwoAddress) OS << "|M_2_ADDR_FLAG";
141 if (Inst.isConvertibleToThreeAddress) OS << "|M_CONVERTIBLE_TO_3_ADDR";
142 if (Inst.isCommutable) OS << "|M_COMMUTABLE";
143 if (Inst.isTerminator) OS << "|M_TERMINATOR_FLAG";
146 // Emit all of the target-specific flags...
147 ListInit *LI = InstrInfo->getValueAsListInit("TSFlagsFields");
148 ListInit *Shift = InstrInfo->getValueAsListInit("TSFlagsShifts");
149 if (LI->getSize() != Shift->getSize())
150 throw "Lengths of " + InstrInfo->getName() +
151 ":(TargetInfoFields, TargetInfoPositions) must be equal!";
153 for (unsigned i = 0, e = LI->getSize(); i != e; ++i)
154 emitShiftedValue(Inst.TheDef, dynamic_cast<StringInit*>(LI->getElement(i)),
155 dynamic_cast<IntInit*>(Shift->getElement(i)), OS);
159 // Emit the implicit uses and defs lists...
160 LI = Inst.TheDef->getValueAsListInit("Uses");
162 OS << "EmptyImpList, ";
164 OS << "ImplicitList" << ListNumbers[LI] << ", ";
166 LI = Inst.TheDef->getValueAsListInit("Defs");
168 OS << "EmptyImpList ";
170 OS << "ImplicitList" << ListNumbers[LI] << " ";
172 OS << " }, // Inst #" << Num << " = " << Inst.TheDef->getName() << "\n";
175 void InstrInfoEmitter::emitShiftedValue(Record *R, StringInit *Val,
176 IntInit *ShiftInt, std::ostream &OS) {
177 if (Val == 0 || ShiftInt == 0)
178 throw std::string("Illegal value or shift amount in TargetInfo*!");
179 RecordVal *RV = R->getValue(Val->getValue());
180 int Shift = ShiftInt->getValue();
182 if (RV == 0 || RV->getValue() == 0)
183 throw R->getName() + " doesn't have a field named '" + Val->getValue()+"'!";
185 Init *Value = RV->getValue();
186 if (BitInit *BI = dynamic_cast<BitInit*>(Value)) {
187 if (BI->getValue()) OS << "|(1<<" << Shift << ")";
189 } else if (BitsInit *BI = dynamic_cast<BitsInit*>(Value)) {
190 // Convert the Bits to an integer to print...
191 Init *I = BI->convertInitializerTo(new IntRecTy());
193 if (IntInit *II = dynamic_cast<IntInit*>(I)) {
195 OS << "|(" << II->getValue() << "<<" << Shift << ")";
199 } else if (IntInit *II = dynamic_cast<IntInit*>(Value)) {
200 if (II->getValue()) OS << "|(" << II->getValue() << "<<" << Shift << ")";
204 std::cerr << "Unhandled initializer: " << *Val << "\n";
205 throw "In record '" + R->getName() + "' for TSFlag emission.";