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 getTargetRecord()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 getRegAltNameIndices()105 const std::vector<Record*> &getRegAltNameIndices() const { 106 if (RegAltNameIndices.empty()) ReadRegAltNameIndices(); 107 return RegAltNameIndices; 108 } 109 getRegisterClasses()110 const std::vector<CodeGenRegisterClass> &getRegisterClasses() const { 111 return getRegBank().getRegClasses(); 112 } 113 getRegisterClass(Record * R)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 getLegalValueTypes()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). isLegalValueType(MVT::SimpleValueType VT)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: getInstructions()137 DenseMap<const Record*, CodeGenInstruction*> &getInstructions() const { 138 if (Instructions.empty()) ReadInstructions(); 139 return Instructions; 140 } 141 public: 142 getInstruction(const Record * InstRec)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*> & getInstructionsByEnumValue()154 getInstructionsByEnumValue() const { 155 if (InstrsByEnum.empty()) ComputeInstrsByEnum(); 156 return InstrsByEnum; 157 } 158 159 typedef std::vector<const CodeGenInstruction*>::const_iterator inst_iterator; inst_begin()160 inst_iterator inst_begin() const{return getInstructionsByEnumValue().begin();} inst_end()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: ComplexPattern()181 ComplexPattern() : NumOperands(0) {} 182 ComplexPattern(Record *R); 183 getValueType()184 MVT::SimpleValueType getValueType() const { return Ty; } getNumOperands()185 unsigned getNumOperands() const { return NumOperands; } getSelectFunc()186 const std::string &getSelectFunc() const { return SelectFunc; } getRootNodes()187 const std::vector<Record*> &getRootNodes() const { 188 return RootNodes; 189 } hasProperty(enum SDNP Prop)190 bool hasProperty(enum SDNP Prop) const { return Properties & (1 << Prop); } 191 }; 192 193 } // End llvm namespace 194 195 #endif 196