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 void CodeGenTarget::ReadInstructions() const {
101   std::vector<Record*> Insts = Records.getAllDerivedDefinitions("Instruction");
102 
103   if (Insts.size() == 0)
104     throw std::string("No 'Instruction' subclasses defined!");
105 
106   for (unsigned i = 0, e = Insts.size(); i != e; ++i)
107     Instructions.insert(std::make_pair(Insts[i]->getName(), Insts[i]));
108 }
109 
110 /// getPHIInstruction - Return the designated PHI instruction.
111 const CodeGenInstruction &CodeGenTarget::getPHIInstruction() const {
112   Record *PHI = getInstructionSet()->getValueAsDef("PHIInst");
113   std::map<std::string, CodeGenInstruction>::const_iterator I =
114     getInstructions().find(PHI->getName());
115   if (I == Instructions.end())
116     throw "Could not find PHI instruction named '" + PHI->getName() + "'!";
117   return I->second;
118 }
119 
120 CodeGenInstruction::CodeGenInstruction(Record *R) : TheDef(R) {
121   Name      = R->getValueAsString("Name");
122   Namespace = R->getValueAsString("Namespace");
123   AsmString = R->getValueAsString("AsmString");
124 
125   isReturn     = R->getValueAsBit("isReturn");
126   isBranch     = R->getValueAsBit("isBranch");
127   isBarrier    = R->getValueAsBit("isBarrier");
128   isCall       = R->getValueAsBit("isCall");
129   isTwoAddress = R->getValueAsBit("isTwoAddress");
130   isTerminator = R->getValueAsBit("isTerminator");
131 
132   try {
133     DagInit *DI = R->getValueAsDag("OperandList");
134 
135     unsigned MIOperandNo = 0;
136     for (unsigned i = 0, e = DI->getNumArgs(); i != e; ++i)
137       if (DefInit *Arg = dynamic_cast<DefInit*>(DI->getArg(i))) {
138         Record *Rec = Arg->getDef();
139         MVT::ValueType Ty;
140         std::string PrintMethod = "printOperand";
141         unsigned NumOps = 1;
142         if (Rec->isSubClassOf("RegisterClass"))
143           Ty = getValueType(Rec->getValueAsDef("RegType"));
144         else if (Rec->isSubClassOf("Operand")) {
145           Ty = getValueType(Rec->getValueAsDef("Type"));
146           PrintMethod = Rec->getValueAsString("PrintMethod");
147           NumOps = Rec->getValueAsInt("NumMIOperands");
148         } else
149           throw "Unknown operand class '" + Rec->getName() +
150                 "' in instruction '" + R->getName() + "' instruction!";
151 
152         OperandList.push_back(OperandInfo(Rec, Ty, DI->getArgName(i),
153                                           PrintMethod, MIOperandNo));
154         MIOperandNo += NumOps;
155       } else {
156         throw "Illegal operand for the '" + R->getName() + "' instruction!";
157       }
158   } catch (...) {
159     // Error parsing operands list, just ignore it.
160     AsmString.clear();
161     OperandList.clear();
162   }
163 }
164 
165 
166 
167 /// getOperandNamed - Return the index of the operand with the specified
168 /// non-empty name.  If the instruction does not have an operand with the
169 /// specified name, throw an exception.
170 unsigned CodeGenInstruction::getOperandNamed(const std::string &Name) const {
171   assert(!Name.empty() && "Cannot search for operand with no name!");
172   for (unsigned i = 0, e = OperandList.size(); i != e; ++i)
173     if (OperandList[i].Name == Name) return i;
174   throw "Instruction '" + TheDef->getName() +
175         "' does not have an operand named '$" + Name + "'!";
176 }
177