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      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 CodeGenRegBank *RegBank;
     69   mutable std::vector<Record*> RegAltNameIndices;
     70   mutable std::vector<MVT::SimpleValueType> LegalValueTypes;
     71   void ReadRegAltNameIndices() const;
     72   void ReadInstructions() const;
     73   void ReadLegalValueTypes() const;
     74 
     75   mutable std::vector<const CodeGenInstruction*> InstrsByEnum;
     76 public:
     77   CodeGenTarget(RecordKeeper &Records);
     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   /// getAsmParser - Return the AssemblyParser definition for this target.
     91   ///
     92   Record *getAsmParser() const;
     93 
     94   /// getAsmWriter - Return the AssemblyWriter definition for this target.
     95   ///
     96   Record *getAsmWriter() const;
     97 
     98   /// getRegBank - Return the register bank description.
     99   CodeGenRegBank &getRegBank() const;
    100 
    101   /// getRegisterByName - If there is a register with the specific AsmName,
    102   /// return it.
    103   const CodeGenRegister *getRegisterByName(StringRef Name) const;
    104 
    105   const std::vector<Record*> &getRegAltNameIndices() const {
    106     if (RegAltNameIndices.empty()) ReadRegAltNameIndices();
    107     return RegAltNameIndices;
    108   }
    109 
    110   const std::vector<CodeGenRegisterClass> &getRegisterClasses() const {
    111     return getRegBank().getRegClasses();
    112   }
    113 
    114   const CodeGenRegisterClass &getRegisterClass(Record *R) const {
    115     return *getRegBank().getRegClass(R);
    116   }
    117 
    118   /// getRegisterVTs - Find the union of all possible SimpleValueTypes for the
    119   /// specified physical register.
    120   std::vector<MVT::SimpleValueType> getRegisterVTs(Record *R) const;
    121 
    122   const std::vector<MVT::SimpleValueType> &getLegalValueTypes() const {
    123     if (LegalValueTypes.empty()) ReadLegalValueTypes();
    124     return LegalValueTypes;
    125   }
    126 
    127   /// isLegalValueType - Return true if the specified value type is natively
    128   /// supported by the target (i.e. there are registers that directly hold it).
    129   bool isLegalValueType(MVT::SimpleValueType VT) const {
    130     const std::vector<MVT::SimpleValueType> &LegalVTs = getLegalValueTypes();
    131     for (unsigned i = 0, e = LegalVTs.size(); i != e; ++i)
    132       if (LegalVTs[i] == VT) return true;
    133     return false;
    134   }
    135 
    136 private:
    137   DenseMap<const Record*, CodeGenInstruction*> &getInstructions() const {
    138     if (Instructions.empty()) ReadInstructions();
    139     return Instructions;
    140   }
    141 public:
    142 
    143   CodeGenInstruction &getInstruction(const Record *InstRec) const {
    144     if (Instructions.empty()) ReadInstructions();
    145     DenseMap<const Record*, CodeGenInstruction*>::iterator I =
    146       Instructions.find(InstRec);
    147     assert(I != Instructions.end() && "Not an instruction");
    148     return *I->second;
    149   }
    150 
    151   /// getInstructionsByEnumValue - Return all of the instructions defined by the
    152   /// target, ordered by their enum value.
    153   const std::vector<const CodeGenInstruction*> &
    154   getInstructionsByEnumValue() const {
    155     if (InstrsByEnum.empty()) ComputeInstrsByEnum();
    156     return InstrsByEnum;
    157   }
    158 
    159   typedef std::vector<const CodeGenInstruction*>::const_iterator inst_iterator;
    160   inst_iterator inst_begin() const{return getInstructionsByEnumValue().begin();}
    161   inst_iterator inst_end() const { return getInstructionsByEnumValue().end(); }
    162 
    163 
    164   /// isLittleEndianEncoding - are instruction bit patterns defined as  [0..n]?
    165   ///
    166   bool isLittleEndianEncoding() const;
    167 
    168 private:
    169   void ComputeInstrsByEnum() const;
    170 };
    171 
    172 /// ComplexPattern - ComplexPattern info, corresponding to the ComplexPattern
    173 /// tablegen class in TargetSelectionDAG.td
    174 class ComplexPattern {
    175   MVT::SimpleValueType Ty;
    176   unsigned NumOperands;
    177   std::string SelectFunc;
    178   std::vector<Record*> RootNodes;
    179   unsigned Properties; // Node properties
    180 public:
    181   ComplexPattern() : NumOperands(0) {}
    182   ComplexPattern(Record *R);
    183 
    184   MVT::SimpleValueType getValueType() const { return Ty; }
    185   unsigned getNumOperands() const { return NumOperands; }
    186   const std::string &getSelectFunc() const { return SelectFunc; }
    187   const std::vector<Record*> &getRootNodes() const {
    188     return RootNodes;
    189   }
    190   bool hasProperty(enum SDNP Prop) const { return Properties & (1 << Prop); }
    191 };
    192 
    193 } // End llvm namespace
    194 
    195 #endif
    196