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 const std::string &CodeGenRegister::getName() const {
116   return TheDef->getName();
117 }
118 
119 
120 void CodeGenTarget::ReadInstructions() const {
121   std::vector<Record*> Insts = Records.getAllDerivedDefinitions("Instruction");
122 
123   if (Insts.empty())
124     throw std::string("No 'Instruction' subclasses defined!");
125 
126   std::string InstFormatName =
127     getAsmWriter()->getValueAsString("InstFormatName");
128 
129   for (unsigned i = 0, e = Insts.size(); i != e; ++i) {
130     std::string AsmStr = Insts[i]->getValueAsString(InstFormatName);
131     Instructions.insert(std::make_pair(Insts[i]->getName(),
132                                        CodeGenInstruction(Insts[i], AsmStr)));
133   }
134 }
135 
136 /// getPHIInstruction - Return the designated PHI instruction.
137 const CodeGenInstruction &CodeGenTarget::getPHIInstruction() const {
138   Record *PHI = getInstructionSet()->getValueAsDef("PHIInst");
139   std::map<std::string, CodeGenInstruction>::const_iterator I =
140     getInstructions().find(PHI->getName());
141   if (I == Instructions.end())
142     throw "Could not find PHI instruction named '" + PHI->getName() + "'!";
143   return I->second;
144 }
145 
146 CodeGenInstruction::CodeGenInstruction(Record *R, const std::string &AsmStr)
147   : TheDef(R), AsmString(AsmStr) {
148   Name      = R->getValueAsString("Name");
149   Namespace = R->getValueAsString("Namespace");
150 
151   isReturn     = R->getValueAsBit("isReturn");
152   isBranch     = R->getValueAsBit("isBranch");
153   isBarrier    = R->getValueAsBit("isBarrier");
154   isCall       = R->getValueAsBit("isCall");
155   isTwoAddress = R->getValueAsBit("isTwoAddress");
156   isTerminator = R->getValueAsBit("isTerminator");
157 
158   try {
159     DagInit *DI = R->getValueAsDag("OperandList");
160 
161     unsigned MIOperandNo = 0;
162     for (unsigned i = 0, e = DI->getNumArgs(); i != e; ++i)
163       if (DefInit *Arg = dynamic_cast<DefInit*>(DI->getArg(i))) {
164         Record *Rec = Arg->getDef();
165         MVT::ValueType Ty;
166         std::string PrintMethod = "printOperand";
167         unsigned NumOps = 1;
168         if (Rec->isSubClassOf("RegisterClass"))
169           Ty = getValueType(Rec->getValueAsDef("RegType"));
170         else if (Rec->isSubClassOf("Operand")) {
171           Ty = getValueType(Rec->getValueAsDef("Type"));
172           PrintMethod = Rec->getValueAsString("PrintMethod");
173           NumOps = Rec->getValueAsInt("NumMIOperands");
174         } else
175           throw "Unknown operand class '" + Rec->getName() +
176                 "' in instruction '" + R->getName() + "' instruction!";
177 
178         OperandList.push_back(OperandInfo(Rec, Ty, DI->getArgName(i),
179                                           PrintMethod, MIOperandNo));
180         MIOperandNo += NumOps;
181       } else {
182         throw "Illegal operand for the '" + R->getName() + "' instruction!";
183       }
184   } catch (...) {
185     // Error parsing operands list, just ignore it.
186     AsmString.clear();
187     OperandList.clear();
188   }
189 }
190 
191 
192 
193 /// getOperandNamed - Return the index of the operand with the specified
194 /// non-empty name.  If the instruction does not have an operand with the
195 /// specified name, throw an exception.
196 unsigned CodeGenInstruction::getOperandNamed(const std::string &Name) const {
197   assert(!Name.empty() && "Cannot search for operand with no name!");
198   for (unsigned i = 0, e = OperandList.size(); i != e; ++i)
199     if (OperandList[i].Name == Name) return i;
200   throw "Instruction '" + TheDef->getName() +
201         "' does not have an operand named '$" + Name + "'!";
202 }
203