1 //===- CodeGenTarget.h - Target Class Wrapper -------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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.
15 //===----------------------------------------------------------------------===//
17 #ifndef CODEGEN_TARGET_H
18 #define CODEGEN_TARGET_H
20 #include "CodeGenRegisters.h"
21 #include "CodeGenInstruction.h"
29 struct CodeGenRegister;
32 // SelectionDAG node properties.
33 // SDNPMemOperand: indicates that a node touches memory and therefore must
34 // have an associated memory operand that describes the access.
48 // ComplexPattern attributes.
49 enum CPAttr { CPAttrParentAsRoot };
51 /// getValueType - Return the MVT::SimpleValueType that the specified TableGen
52 /// record corresponds to.
53 MVT::SimpleValueType getValueType(Record *Rec);
55 std::string getName(MVT::SimpleValueType T);
56 std::string getEnumName(MVT::SimpleValueType T);
58 /// getQualifiedName - Return the name of the specified record, with a
59 /// namespace qualifier if the record contains one.
60 std::string getQualifiedName(const Record *R);
62 /// CodeGenTarget - This class corresponds to the Target class in the .td files.
67 mutable std::map<std::string, CodeGenInstruction> Instructions;
68 mutable std::vector<CodeGenRegister> Registers;
69 mutable std::vector<CodeGenRegisterClass> RegisterClasses;
70 mutable std::vector<MVT::SimpleValueType> LegalValueTypes;
71 void ReadRegisters() const;
72 void ReadRegisterClasses() const;
73 void ReadInstructions() const;
74 void ReadLegalValueTypes() const;
78 Record *getTargetRecord() const { return TargetRec; }
79 const std::string &getName() const;
81 /// getInstNamespace - Return the target-specific instruction namespace.
83 std::string getInstNamespace() const;
85 /// getInstructionSet - Return the InstructionSet object.
87 Record *getInstructionSet() const;
89 /// getAsmWriter - Return the AssemblyWriter definition for this target.
91 Record *getAsmWriter() const;
93 const std::vector<CodeGenRegister> &getRegisters() const {
94 if (Registers.empty()) ReadRegisters();
98 const std::vector<CodeGenRegisterClass> &getRegisterClasses() const {
99 if (RegisterClasses.empty()) ReadRegisterClasses();
100 return RegisterClasses;
103 const CodeGenRegisterClass &getRegisterClass(Record *R) const {
104 const std::vector<CodeGenRegisterClass> &RC = getRegisterClasses();
105 for (unsigned i = 0, e = RC.size(); i != e; ++i)
106 if (RC[i].TheDef == R)
108 assert(0 && "Didn't find the register class");
112 /// getRegisterClassForRegister - Find the register class that contains the
113 /// specified physical register. If there register exists in multiple
114 /// register classes or is not in a register class, return null.
115 const CodeGenRegisterClass *getRegisterClassForRegister(Record *R) const {
116 const std::vector<CodeGenRegisterClass> &RCs = getRegisterClasses();
117 const CodeGenRegisterClass *FoundRC = 0;
118 for (unsigned i = 0, e = RCs.size(); i != e; ++i) {
119 const CodeGenRegisterClass &RC = RegisterClasses[i];
120 for (unsigned ei = 0, ee = RC.Elements.size(); ei != ee; ++ei) {
121 if (R == RC.Elements[ei]) {
122 if (FoundRC) return 0; // In multiple RC's
131 /// getRegisterVTs - Find the union of all possible SimpleValueTypes for the
132 /// specified physical register.
133 std::vector<unsigned char> getRegisterVTs(Record *R) const;
135 const std::vector<MVT::SimpleValueType> &getLegalValueTypes() const {
136 if (LegalValueTypes.empty()) ReadLegalValueTypes();
137 return LegalValueTypes;
140 /// isLegalValueType - Return true if the specified value type is natively
141 /// supported by the target (i.e. there are registers that directly hold it).
142 bool isLegalValueType(MVT::SimpleValueType VT) const {
143 const std::vector<MVT::SimpleValueType> &LegalVTs = getLegalValueTypes();
144 for (unsigned i = 0, e = LegalVTs.size(); i != e; ++i)
145 if (LegalVTs[i] == VT) return true;
149 /// getInstructions - Return all of the instructions defined for this target.
151 const std::map<std::string, CodeGenInstruction> &getInstructions() const {
152 if (Instructions.empty()) ReadInstructions();
155 std::map<std::string, CodeGenInstruction> &getInstructions() {
156 if (Instructions.empty()) ReadInstructions();
160 CodeGenInstruction &getInstruction(const std::string &Name) const {
161 const std::map<std::string, CodeGenInstruction> &Insts = getInstructions();
162 assert(Insts.count(Name) && "Not an instruction!");
163 return const_cast<CodeGenInstruction&>(Insts.find(Name)->second);
166 typedef std::map<std::string,
167 CodeGenInstruction>::const_iterator inst_iterator;
168 inst_iterator inst_begin() const { return getInstructions().begin(); }
169 inst_iterator inst_end() const { return Instructions.end(); }
171 /// getInstructionsByEnumValue - Return all of the instructions defined by the
172 /// target, ordered by their enum value.
173 void getInstructionsByEnumValue(std::vector<const CodeGenInstruction*>
174 &NumberedInstructions);
177 /// isLittleEndianEncoding - are instruction bit patterns defined as [0..n]?
179 bool isLittleEndianEncoding() const;
182 /// ComplexPattern - ComplexPattern info, corresponding to the ComplexPattern
183 /// tablegen class in TargetSelectionDAG.td
184 class ComplexPattern {
185 MVT::SimpleValueType Ty;
186 unsigned NumOperands;
187 std::string SelectFunc;
188 std::vector<Record*> RootNodes;
189 unsigned Properties; // Node properties
190 unsigned Attributes; // Pattern attributes
192 ComplexPattern() : NumOperands(0) {};
193 ComplexPattern(Record *R);
195 MVT::SimpleValueType getValueType() const { return Ty; }
196 unsigned getNumOperands() const { return NumOperands; }
197 const std::string &getSelectFunc() const { return SelectFunc; }
198 const std::vector<Record*> &getRootNodes() const {
201 bool hasProperty(enum SDNP Prop) const { return Properties & (1 << Prop); }
202 bool hasAttribute(enum CPAttr Attr) const { return Attributes & (1 << Attr); }
205 } // End llvm namespace