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 "Record.h"
  23 #include "llvm/Support/raw_ostream.h"
  24 #include <algorithm>
  25
  26 namespace llvm {
  27
  28 struct CodeGenRegister;
  29 class CodeGenTarget;
  30
  31 // SelectionDAG node properties.
  32 //  SDNPMemOperand: indicates that a node touches memory and therefore must
  33 //                  have an associated memory operand that describes the access.
  34 enum SDNP {
  35   SDNPCommutative,
  36   SDNPAssociative,
  37   SDNPHasChain,
  38   SDNPOutGlue,
  39   SDNPInGlue,
  40   SDNPOptInGlue,
  41   SDNPMayLoad,
  42   SDNPMayStore,
  43   SDNPSideEffect,
  44   SDNPMemOperand,
  45   SDNPVariadic,
  46   SDNPWantRoot,
  47   SDNPWantParent
  48 };
  49
  50 /// getValueType - Return the MVT::SimpleValueType that the specified TableGen
  51 /// record corresponds to.
  52 MVT::SimpleValueType getValueType(Record *Rec);
  53
  54 std::string getName(MVT::SimpleValueType T);
  55 std::string getEnumName(MVT::SimpleValueType T);
  56
  57 /// getQualifiedName - Return the name of the specified record, with a
  58 /// namespace qualifier if the record contains one.
  59 std::string getQualifiedName(const Record *R);
  60
  61 /// CodeGenTarget - This class corresponds to the Target class in the .td files.
  62 ///
  63 class CodeGenTarget {
  64   RecordKeeper &Records;
  65   Record *TargetRec;
  66
  67   mutable DenseMap<const Record*, CodeGenInstruction*> Instructions;
  68   mutable std::vector<CodeGenRegister> Registers;
  69   mutable std::vector<Record*> SubRegIndices;
  70   mutable std::vector<CodeGenRegisterClass> RegisterClasses;
  71   mutable std::vector<MVT::SimpleValueType> LegalValueTypes;
  72   void ReadRegisters() const;
  73   void ReadSubRegIndices() const;
  74   void ReadRegisterClasses() const;
  75   void ReadInstructions() const;
  76   void ReadLegalValueTypes() const;
  77
  78   mutable std::vector<const CodeGenInstruction*> InstrsByEnum;
  79 public:
  80   CodeGenTarget(RecordKeeper &Records);
  81
  82   Record *getTargetRecord() const { return TargetRec; }
  83   const std::string &getName() const;
  84
  85   /// getInstNamespace - Return the target-specific instruction namespace.
  86   ///
  87   std::string getInstNamespace() const;
  88
  89   /// getInstructionSet - Return the InstructionSet object.
  90   ///
  91   Record *getInstructionSet() const;
  92
  93   /// getAsmParser - Return the AssemblyParser definition for this target.
  94   ///
  95   Record *getAsmParser() const;
  96
  97   /// getAsmWriter - Return the AssemblyWriter definition for this target.
  98   ///
  99   Record *getAsmWriter() const;
 100
 101   const std::vector<CodeGenRegister> &getRegisters() const {
 102     if (Registers.empty()) ReadRegisters();
 103     return Registers;
 104   }
 105
 106   /// getRegisterByName - If there is a register with the specific AsmName,
 107   /// return it.
 108   const CodeGenRegister *getRegisterByName(StringRef Name) const;
 109
 110   const std::vector<Record*> &getSubRegIndices() const {
 111     if (SubRegIndices.empty()) ReadSubRegIndices();
 112     return SubRegIndices;
 113   }
 114
 115   // Map a SubRegIndex Record to its number.
 116   unsigned getSubRegIndexNo(Record *idx) const {
 117     if (SubRegIndices.empty()) ReadSubRegIndices();
 118     std::vector<Record*>::const_iterator i =
 119       std::find(SubRegIndices.begin(), SubRegIndices.end(), idx);
 120     assert(i != SubRegIndices.end() && "Not a SubRegIndex");
 121     return (i - SubRegIndices.begin()) + 1;
 122   }
 123
 124   const std::vector<CodeGenRegisterClass> &getRegisterClasses() const {
 125     if (RegisterClasses.empty()) ReadRegisterClasses();
 126     return RegisterClasses;
 127   }
 128
 129   const CodeGenRegisterClass &getRegisterClass(Record *R) const {
 130     const std::vector<CodeGenRegisterClass> &RC = getRegisterClasses();
 131     for (unsigned i = 0, e = RC.size(); i != e; ++i)
 132       if (RC[i].TheDef == R)
 133         return RC[i];
 134     assert(0 && "Didn't find the register class");
 135     abort();
 136   }
 137
 138   /// getRegisterClassForRegister - Find the register class that contains the
 139   /// specified physical register.  If the register is not in a register
 140   /// class, return null. If the register is in multiple classes, and the
 141   /// classes have a superset-subset relationship and the same set of
 142   /// types, return the superclass.  Otherwise return null.
 143   const CodeGenRegisterClass *getRegisterClassForRegister(Record *R) const {
 144     const std::vector<CodeGenRegisterClass> &RCs = getRegisterClasses();
 145     const CodeGenRegisterClass *FoundRC = 0;
 146     for (unsigned i = 0, e = RCs.size(); i != e; ++i) {
 147       const CodeGenRegisterClass &RC = RegisterClasses[i];
 148       for (unsigned ei = 0, ee = RC.Elements.size(); ei != ee; ++ei) {
 149         if (R != RC.Elements[ei])
 150           continue;
 151
 152         // If a register's classes have different types, return null.
 153         if (FoundRC && RC.getValueTypes() != FoundRC->getValueTypes())
 154           return 0;
 155
 156         // If this is the first class that contains the register,
 157         // make a note of it and go on to the next class.
 158         if (!FoundRC) {
 159           FoundRC = &RC;
 160           break;
 161         }
 162
 163         std::vector<Record *> Elements(RC.Elements);
 164         std::vector<Record *> FoundElements(FoundRC->Elements);
 165         std::sort(Elements.begin(), Elements.end());
 166         std::sort(FoundElements.begin(), FoundElements.end());
 167
 168         // Check to see if the previously found class that contains
 169         // the register is a subclass of the current class. If so,
 170         // prefer the superclass.
 171         if (std::includes(Elements.begin(), Elements.end(),
 172                           FoundElements.begin(), FoundElements.end())) {
 173           FoundRC = &RC;
 174           break;
 175         }
 176
 177         // Check to see if the previously found class that contains
 178         // the register is a superclass of the current class. If so,
 179         // prefer the superclass.
 180         if (std::includes(FoundElements.begin(), FoundElements.end(),
 181                           Elements.begin(), Elements.end()))
 182           break;
 183
 184         // Multiple classes, and neither is a superclass of the other.
 185         // Return null.
 186         return 0;
 187       }
 188     }
 189     return FoundRC;
 190   }
 191
 192   /// getRegisterVTs - Find the union of all possible SimpleValueTypes for the
 193   /// specified physical register.
 194   std::vector<MVT::SimpleValueType> getRegisterVTs(Record *R) const;
 195
 196   const std::vector<MVT::SimpleValueType> &getLegalValueTypes() const {
 197     if (LegalValueTypes.empty()) ReadLegalValueTypes();
 198     return LegalValueTypes;
 199   }
 200
 201   /// isLegalValueType - Return true if the specified value type is natively
 202   /// supported by the target (i.e. there are registers that directly hold it).
 203   bool isLegalValueType(MVT::SimpleValueType VT) const {
 204     const std::vector<MVT::SimpleValueType> &LegalVTs = getLegalValueTypes();
 205     for (unsigned i = 0, e = LegalVTs.size(); i != e; ++i)
 206       if (LegalVTs[i] == VT) return true;
 207     return false;
 208   }
 209
 210 private:
 211   DenseMap<const Record*, CodeGenInstruction*> &getInstructions() const {
 212     if (Instructions.empty()) ReadInstructions();
 213     return Instructions;
 214   }
 215 public:
 216
 217   CodeGenInstruction &getInstruction(const Record *InstRec) const {
 218     if (Instructions.empty()) ReadInstructions();
 219     DenseMap<const Record*, CodeGenInstruction*>::iterator I =
 220       Instructions.find(InstRec);
 221     assert(I != Instructions.end() && "Not an instruction");
 222     return *I->second;
 223   }
 224
 225   /// getInstructionsByEnumValue - Return all of the instructions defined by the
 226   /// target, ordered by their enum value.
 227   const std::vector<const CodeGenInstruction*> &
 228   getInstructionsByEnumValue() const {
 229     if (InstrsByEnum.empty()) ComputeInstrsByEnum();
 230     return InstrsByEnum;
 231   }
 232
 233   typedef std::vector<const CodeGenInstruction*>::const_iterator inst_iterator;
 234   inst_iterator inst_begin() const{return getInstructionsByEnumValue().begin();}
 235   inst_iterator inst_end() const { return getInstructionsByEnumValue().end(); }
 236
 237
 238   /// isLittleEndianEncoding - are instruction bit patterns defined as  [0..n]?
 239   ///
 240   bool isLittleEndianEncoding() const;
 241
 242 private:
 243   void ComputeInstrsByEnum() const;
 244 };
 245
 246 /// ComplexPattern - ComplexPattern info, corresponding to the ComplexPattern
 247 /// tablegen class in TargetSelectionDAG.td
 248 class ComplexPattern {
 249   MVT::SimpleValueType Ty;
 250   unsigned NumOperands;
 251   std::string SelectFunc;
 252   std::vector<Record*> RootNodes;
 253   unsigned Properties; // Node properties
 254 public:
 255   ComplexPattern() : NumOperands(0) {}
 256   ComplexPattern(Record *R);
 257
 258   MVT::SimpleValueType getValueType() const { return Ty; }
 259   unsigned getNumOperands() const { return NumOperands; }
 260   const std::string &getSelectFunc() const { return SelectFunc; }
 261   const std::vector<Record*> &getRootNodes() const {
 262     return RootNodes;
 263   }
 264   bool hasProperty(enum SDNP Prop) const { return Properties & (1 << Prop); }
 265 };
 266
 267 } // End llvm namespace
 268
 269 #endif