utils/TableGen/CodeGenTarget.h

   1 //===- CodeGenTarget.h - Target Class Wrapper -------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file defines wrappers for the Target class and related global
  11 // functionality.  This makes it easier to access the data and provides a single
  12 // place that needs to check it for validity.  All of these classes throw
  13 // exceptions on error conditions.
  14 //
  15 //===----------------------------------------------------------------------===//
  16
  17 #ifndef CODEGEN_TARGET_H
  18 #define CODEGEN_TARGET_H
  19
  20 #include "CodeGenRegisters.h"
  21 #include "CodeGenInstruction.h"
  22 #include <algorithm>
  23 #include <iosfwd>
  24 #include <map>
  25
  26 namespace llvm {
  27
  28 class Record;
  29 class RecordKeeper;
  30 struct CodeGenRegister;
  31 class CodeGenTarget;
  32
  33 // SelectionDAG node properties.
  34 //  SDNPMemOperand: indicates that a node touches memory and therefore must
  35 //                  have an associated memory operand that describes the access.
  36 enum SDNP {
  37   SDNPCommutative,
  38   SDNPAssociative,
  39   SDNPHasChain,
  40   SDNPOutFlag,
  41   SDNPInFlag,
  42   SDNPOptInFlag,
  43   SDNPMayLoad,
  44   SDNPMayStore,
  45   SDNPSideEffect,
  46   SDNPMemOperand
  47 };
  48
  49 // ComplexPattern attributes.
  50 enum CPAttr { CPAttrParentAsRoot };
  51
  52 /// getValueType - Return the MVT::SimpleValueType that the specified TableGen
  53 /// record corresponds to.
  54 MVT::SimpleValueType getValueType(Record *Rec);
  55
  56 std::string getName(MVT::SimpleValueType T);
  57 std::string getEnumName(MVT::SimpleValueType T);
  58
  59 /// getQualifiedName - Return the name of the specified record, with a
  60 /// namespace qualifier if the record contains one.
  61 std::string getQualifiedName(const Record *R);
  62
  63 /// CodeGenTarget - This class corresponds to the Target class in the .td files.
  64 ///
  65 class CodeGenTarget {
  66   Record *TargetRec;
  67
  68   mutable std::map<std::string, CodeGenInstruction> Instructions;
  69   mutable std::vector<CodeGenRegister> Registers;
  70   mutable std::vector<CodeGenRegisterClass> RegisterClasses;
  71   mutable std::vector<MVT::SimpleValueType> LegalValueTypes;
  72   void ReadRegisters() const;
  73   void ReadRegisterClasses() const;
  74   void ReadInstructions() const;
  75   void ReadLegalValueTypes() const;
  76 public:
  77   CodeGenTarget();
  78
  79   Record *getTargetRecord() const { return TargetRec; }
  80   const std::string &getName() const;
  81
  82   /// getInstNamespace - Return the target-specific instruction namespace.
  83   ///
  84   std::string getInstNamespace() const;
  85
  86   /// getInstructionSet - Return the InstructionSet object.
  87   ///
  88   Record *getInstructionSet() const;
  89
  90   /// getAsmWriter - Return the AssemblyWriter definition for this target.
  91   ///
  92   Record *getAsmWriter() const;
  93
  94   const std::vector<CodeGenRegister> &getRegisters() const {
  95     if (Registers.empty()) ReadRegisters();
  96     return Registers;
  97   }
  98
  99   const std::vector<CodeGenRegisterClass> &getRegisterClasses() const {
 100     if (RegisterClasses.empty()) ReadRegisterClasses();
 101     return RegisterClasses;
 102   }
 103
 104   const CodeGenRegisterClass &getRegisterClass(Record *R) const {
 105     const std::vector<CodeGenRegisterClass> &RC = getRegisterClasses();
 106     for (unsigned i = 0, e = RC.size(); i != e; ++i)
 107       if (RC[i].TheDef == R)
 108         return RC[i];
 109     assert(0 && "Didn't find the register class");
 110     abort();
 111   }
 112
 113   /// getRegisterClassForRegister - Find the register class that contains the
 114   /// specified physical register.  If the register is not in a register
 115   /// class, return null. If the register is in multiple classes, and the
 116   /// classes have a superset-subset relationship and the same set of
 117   /// types, return the superclass.  Otherwise return null.
 118   const CodeGenRegisterClass *getRegisterClassForRegister(Record *R) const {
 119     const std::vector<CodeGenRegisterClass> &RCs = getRegisterClasses();
 120     const CodeGenRegisterClass *FoundRC = 0;
 121     for (unsigned i = 0, e = RCs.size(); i != e; ++i) {
 122       const CodeGenRegisterClass &RC = RegisterClasses[i];
 123       for (unsigned ei = 0, ee = RC.Elements.size(); ei != ee; ++ei) {
 124         if (R != RC.Elements[ei])
 125           continue;
 126
 127         // If a register's classes have different types, return null.
 128         if (FoundRC && RC.getValueTypes() != FoundRC->getValueTypes())
 129           return 0;
 130
 131         // If this is the first class that contains the register,
 132         // make a note of it and go on to the next class.
 133         if (!FoundRC) {
 134           FoundRC = &RC;
 135           break;
 136         }
 137
 138         std::vector<Record *> Elements(RC.Elements);
 139         std::vector<Record *> FoundElements(FoundRC->Elements);
 140         std::sort(Elements.begin(), Elements.end());
 141         std::sort(FoundElements.begin(), FoundElements.end());
 142
 143         // Check to see if the previously found class that contains
 144         // the register is a subclass of the current class. If so,
 145         // prefer the superclass.
 146         if (std::includes(Elements.begin(), Elements.end(),
 147                           FoundElements.begin(), FoundElements.end())) {
 148           FoundRC = &RC;
 149           break;
 150         }
 151
 152         // Check to see if the previously found class that contains
 153         // the register is a superclass of the current class. If so,
 154         // prefer the superclass.
 155         if (std::includes(FoundElements.begin(), FoundElements.end(),
 156                           Elements.begin(), Elements.end()))
 157           break;
 158
 159         // Multiple classes, and neither is a superclass of the other.
 160         // Return null.
 161         return 0;
 162       }
 163     }
 164     return FoundRC;
 165   }
 166
 167   /// getRegisterVTs - Find the union of all possible SimpleValueTypes for the
 168   /// specified physical register.
 169   std::vector<unsigned char> getRegisterVTs(Record *R) const;
 170
 171   const std::vector<MVT::SimpleValueType> &getLegalValueTypes() const {
 172     if (LegalValueTypes.empty()) ReadLegalValueTypes();
 173     return LegalValueTypes;
 174   }
 175
 176   /// isLegalValueType - Return true if the specified value type is natively
 177   /// supported by the target (i.e. there are registers that directly hold it).
 178   bool isLegalValueType(MVT::SimpleValueType VT) const {
 179     const std::vector<MVT::SimpleValueType> &LegalVTs = getLegalValueTypes();
 180     for (unsigned i = 0, e = LegalVTs.size(); i != e; ++i)
 181       if (LegalVTs[i] == VT) return true;
 182     return false;
 183   }
 184
 185   /// getInstructions - Return all of the instructions defined for this target.
 186   ///
 187   const std::map<std::string, CodeGenInstruction> &getInstructions() const {
 188     if (Instructions.empty()) ReadInstructions();
 189     return Instructions;
 190   }
 191   std::map<std::string, CodeGenInstruction> &getInstructions() {
 192     if (Instructions.empty()) ReadInstructions();
 193     return Instructions;
 194   }
 195
 196   CodeGenInstruction &getInstruction(const std::string &Name) const {
 197     const std::map<std::string, CodeGenInstruction> &Insts = getInstructions();
 198     assert(Insts.count(Name) && "Not an instruction!");
 199     return const_cast<CodeGenInstruction&>(Insts.find(Name)->second);
 200   }
 201
 202   typedef std::map<std::string,
 203                    CodeGenInstruction>::const_iterator inst_iterator;
 204   inst_iterator inst_begin() const { return getInstructions().begin(); }
 205   inst_iterator inst_end() const { return Instructions.end(); }
 206
 207   /// getInstructionsByEnumValue - Return all of the instructions defined by the
 208   /// target, ordered by their enum value.
 209   void getInstructionsByEnumValue(std::vector<const CodeGenInstruction*>
 210                                                 &NumberedInstructions);
 211
 212
 213   /// isLittleEndianEncoding - are instruction bit patterns defined as  [0..n]?
 214   ///
 215   bool isLittleEndianEncoding() const;
 216 };
 217
 218 /// ComplexPattern - ComplexPattern info, corresponding to the ComplexPattern
 219 /// tablegen class in TargetSelectionDAG.td
 220 class ComplexPattern {
 221   MVT::SimpleValueType Ty;
 222   unsigned NumOperands;
 223   std::string SelectFunc;
 224   std::vector<Record*> RootNodes;
 225   unsigned Properties; // Node properties
 226   unsigned Attributes; // Pattern attributes
 227 public:
 228   ComplexPattern() : NumOperands(0) {};
 229   ComplexPattern(Record *R);
 230
 231   MVT::SimpleValueType getValueType() const { return Ty; }
 232   unsigned getNumOperands() const { return NumOperands; }
 233   const std::string &getSelectFunc() const { return SelectFunc; }
 234   const std::vector<Record*> &getRootNodes() const {
 235     return RootNodes;
 236   }
 237   bool hasProperty(enum SDNP Prop) const { return Properties & (1 << Prop); }
 238   bool hasAttribute(enum CPAttr Attr) const { return Attributes & (1 << Attr); }
 239 };
 240
 241 } // End llvm namespace
 242
 243 #endif