1 //===- CodeGenTarget.cpp - CodeGen Target Class Wrapper ---------*- C++ -*-===//
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 class wrap target description classes used by the various code
11 // generation TableGen backends.  This makes it easier to access the data and
12 // provides a single place that needs to check it for validity.  All of these
13 // classes throw exceptions on error conditions.
14 //
15 //===----------------------------------------------------------------------===//
16 
17 #include "CodeGenTarget.h"
18 #include "Record.h"
19 using namespace llvm;
20 
21 /// getValueType - Return the MCV::ValueType that the specified TableGen record
22 /// corresponds to.
23 MVT::ValueType llvm::getValueType(Record *Rec) {
24   return (MVT::ValueType)Rec->getValueAsInt("Value");
25 }
26 
27 std::string llvm::getName(MVT::ValueType T) {
28   switch (T) {
29   case MVT::Other: return "UNKNOWN";
30   case MVT::i1:    return "i1";
31   case MVT::i8:    return "i8";
32   case MVT::i16:   return "i16";
33   case MVT::i32:   return "i32";
34   case MVT::i64:   return "i64";
35   case MVT::i128:  return "i128";
36   case MVT::f32:   return "f32";
37   case MVT::f64:   return "f64";
38   case MVT::f80:   return "f80";
39   case MVT::f128:  return "f128";
40   case MVT::isVoid:return "void";
41   default: assert(0 && "ILLEGAL VALUE TYPE!"); return "";
42   }
43 }
44 
45 std::string llvm::getEnumName(MVT::ValueType T) {
46   switch (T) {
47   case MVT::Other: return "Other";
48   case MVT::i1:    return "i1";
49   case MVT::i8:    return "i8";
50   case MVT::i16:   return "i16";
51   case MVT::i32:   return "i32";
52   case MVT::i64:   return "i64";
53   case MVT::i128:  return "i128";
54   case MVT::f32:   return "f32";
55   case MVT::f64:   return "f64";
56   case MVT::f80:   return "f80";
57   case MVT::f128:  return "f128";
58   case MVT::isVoid:return "isVoid";
59   default: assert(0 && "ILLEGAL VALUE TYPE!"); return "";
60   }
61 }
62 
63 
64 std::ostream &llvm::operator<<(std::ostream &OS, MVT::ValueType T) {
65   return OS << getName(T);
66 }
67 
68 
69 /// getTarget - Return the current instance of the Target class.
70 ///
71 CodeGenTarget::CodeGenTarget() : PointerType(MVT::Other) {
72   std::vector<Record*> Targets = Records.getAllDerivedDefinitions("Target");
73   if (Targets.size() == 0)
74     throw std::string("ERROR: No 'Target' subclasses defined!");
75   if (Targets.size() != 1)
76     throw std::string("ERROR: Multiple subclasses of Target defined!");
77   TargetRec = Targets[0];
78 
79   // Read in all of the CalleeSavedRegisters...
80   ListInit *LI = TargetRec->getValueAsListInit("CalleeSavedRegisters");
81   for (unsigned i = 0, e = LI->getSize(); i != e; ++i)
82     if (DefInit *DI = dynamic_cast<DefInit*>(LI->getElement(i)))
83       CalleeSavedRegisters.push_back(DI->getDef());
84     else
85       throw "Target: " + TargetRec->getName() +
86             " expected register definition in CalleeSavedRegisters list!";
87 
88   PointerType = getValueType(TargetRec->getValueAsDef("PointerType"));
89 }
90 
91 
92 const std::string &CodeGenTarget::getName() const {
93   return TargetRec->getName();
94 }
95 
96 Record *CodeGenTarget::getInstructionSet() const {
97   return TargetRec->getValueAsDef("InstructionSet");
98 }
99 
100 /// getAsmWriter - Return the AssemblyWriter definition for this target.
101 ///
102 Record *CodeGenTarget::getAsmWriter() const {
103   return TargetRec->getValueAsDef("AssemblyWriter");
104 }
105 
106 void CodeGenTarget::ReadRegisters() const {
107   std::vector<Record*> Regs = Records.getAllDerivedDefinitions("Register");
108   if (Regs.empty())
109     throw std::string("No 'Register' subclasses defined!");
110 
111   Registers.reserve(Regs.size());
112   Registers.assign(Regs.begin(), Regs.end());
113 }
114 
115 CodeGenRegister::CodeGenRegister(Record *R) : TheDef(R) {
116   DeclaredSpillSize = R->getValueAsInt("SpillSize");
117   DeclaredSpillAlignment = R->getValueAsInt("SpillAlignment");
118 }
119 
120 const std::string &CodeGenRegister::getName() const {
121   return TheDef->getName();
122 }
123 
124 void CodeGenTarget::ReadRegisterClasses() const {
125   std::vector<Record*> RegClasses =
126     Records.getAllDerivedDefinitions("RegisterClass");
127   if (RegClasses.empty())
128     throw std::string("No 'RegisterClass' subclasses defined!");
129 
130   RegisterClasses.reserve(RegClasses.size());
131   RegisterClasses.assign(RegClasses.begin(), RegClasses.end());
132 }
133 
134 CodeGenRegisterClass::CodeGenRegisterClass(Record *R) : TheDef(R) {
135   SpillSize = R->getValueAsInt("Size");
136   // FIXME: should convert to bits in all targets.
137   SpillAlignment = R->getValueAsInt("Alignment")*8;
138 
139   if (CodeInit *CI = dynamic_cast<CodeInit*>(R->getValueInit("Methods")))
140     MethodDefinitions = CI->getValue();
141   else
142     throw "Expected 'code' fragment for 'Methods' value in register class '"+
143           getName() + "'!";
144 
145   ListInit *RegList = R->getValueAsListInit("MemberList");
146   for (unsigned i = 0, e = RegList->getSize(); i != e; ++i) {
147     DefInit *RegDef = dynamic_cast<DefInit*>(RegList->getElement(i));
148     if (!RegDef) throw "Register class member is not a record!";
149     Record *Reg = RegDef->getDef();
150 
151     if (!Reg->isSubClassOf("Register"))
152       throw "Register Class member '" + Reg->getName() +
153             "' does not derive from the Register class!";
154     Elements.push_back(Reg);
155   }
156 }
157 
158 const std::string &CodeGenRegisterClass::getName() const {
159   return TheDef->getName();
160 }
161 
162 
163 
164 void CodeGenTarget::ReadInstructions() const {
165   std::vector<Record*> Insts = Records.getAllDerivedDefinitions("Instruction");
166 
167   if (Insts.empty())
168     throw std::string("No 'Instruction' subclasses defined!");
169 
170   std::string InstFormatName =
171     getAsmWriter()->getValueAsString("InstFormatName");
172 
173   for (unsigned i = 0, e = Insts.size(); i != e; ++i) {
174     std::string AsmStr = Insts[i]->getValueAsString(InstFormatName);
175     Instructions.insert(std::make_pair(Insts[i]->getName(),
176                                        CodeGenInstruction(Insts[i], AsmStr)));
177   }
178 }
179 
180 /// getPHIInstruction - Return the designated PHI instruction.
181 const CodeGenInstruction &CodeGenTarget::getPHIInstruction() const {
182   Record *PHI = getInstructionSet()->getValueAsDef("PHIInst");
183   std::map<std::string, CodeGenInstruction>::const_iterator I =
184     getInstructions().find(PHI->getName());
185   if (I == Instructions.end())
186     throw "Could not find PHI instruction named '" + PHI->getName() + "'!";
187   return I->second;
188 }
189 
190 CodeGenInstruction::CodeGenInstruction(Record *R, const std::string &AsmStr)
191   : TheDef(R), AsmString(AsmStr) {
192   Name      = R->getValueAsString("Name");
193   Namespace = R->getValueAsString("Namespace");
194 
195   isReturn     = R->getValueAsBit("isReturn");
196   isBranch     = R->getValueAsBit("isBranch");
197   isBarrier    = R->getValueAsBit("isBarrier");
198   isCall       = R->getValueAsBit("isCall");
199   isTwoAddress = R->getValueAsBit("isTwoAddress");
200   isTerminator = R->getValueAsBit("isTerminator");
201 
202   try {
203     DagInit *DI = R->getValueAsDag("OperandList");
204 
205     unsigned MIOperandNo = 0;
206     for (unsigned i = 0, e = DI->getNumArgs(); i != e; ++i)
207       if (DefInit *Arg = dynamic_cast<DefInit*>(DI->getArg(i))) {
208         Record *Rec = Arg->getDef();
209         MVT::ValueType Ty;
210         std::string PrintMethod = "printOperand";
211         unsigned NumOps = 1;
212         if (Rec->isSubClassOf("RegisterClass"))
213           Ty = getValueType(Rec->getValueAsDef("RegType"));
214         else if (Rec->isSubClassOf("Operand")) {
215           Ty = getValueType(Rec->getValueAsDef("Type"));
216           PrintMethod = Rec->getValueAsString("PrintMethod");
217           NumOps = Rec->getValueAsInt("NumMIOperands");
218         } else
219           throw "Unknown operand class '" + Rec->getName() +
220                 "' in instruction '" + R->getName() + "' instruction!";
221 
222         OperandList.push_back(OperandInfo(Rec, Ty, DI->getArgName(i),
223                                           PrintMethod, MIOperandNo));
224         MIOperandNo += NumOps;
225       } else {
226         throw "Illegal operand for the '" + R->getName() + "' instruction!";
227       }
228   } catch (...) {
229     // Error parsing operands list, just ignore it.
230     AsmString.clear();
231     OperandList.clear();
232   }
233 }
234 
235 
236 
237 /// getOperandNamed - Return the index of the operand with the specified
238 /// non-empty name.  If the instruction does not have an operand with the
239 /// specified name, throw an exception.
240 unsigned CodeGenInstruction::getOperandNamed(const std::string &Name) const {
241   assert(!Name.empty() && "Cannot search for operand with no name!");
242   for (unsigned i = 0, e = OperandList.size(); i != e; ++i)
243     if (OperandList[i].Name == Name) return i;
244   throw "Instruction '" + TheDef->getName() +
245         "' does not have an operand named '$" + Name + "'!";
246 }
247