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269 lines
9.0 KiB
C++
269 lines
9.0 KiB
C++
//===- CodeGenTarget.h - Target Class Wrapper -------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines wrappers for the Target class and related global
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// functionality. This makes it easier to access the data and provides a single
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// place that needs to check it for validity. All of these classes throw
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// exceptions on error conditions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef CODEGEN_TARGET_H
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#define CODEGEN_TARGET_H
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#include "CodeGenRegisters.h"
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#include "CodeGenInstruction.h"
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#include "Record.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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namespace llvm {
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struct CodeGenRegister;
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class CodeGenTarget;
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// SelectionDAG node properties.
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// SDNPMemOperand: indicates that a node touches memory and therefore must
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// have an associated memory operand that describes the access.
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enum SDNP {
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SDNPCommutative,
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SDNPAssociative,
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SDNPHasChain,
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SDNPOutFlag,
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SDNPInFlag,
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SDNPOptInFlag,
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SDNPMayLoad,
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SDNPMayStore,
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SDNPSideEffect,
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SDNPMemOperand,
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SDNPVariadic,
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SDNPWantRoot,
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SDNPWantParent
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};
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/// getValueType - Return the MVT::SimpleValueType that the specified TableGen
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/// record corresponds to.
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MVT::SimpleValueType getValueType(Record *Rec);
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std::string getName(MVT::SimpleValueType T);
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std::string getEnumName(MVT::SimpleValueType T);
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/// getQualifiedName - Return the name of the specified record, with a
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/// namespace qualifier if the record contains one.
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std::string getQualifiedName(const Record *R);
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/// CodeGenTarget - This class corresponds to the Target class in the .td files.
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///
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class CodeGenTarget {
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Record *TargetRec;
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mutable DenseMap<const Record*, CodeGenInstruction*> Instructions;
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mutable std::vector<CodeGenRegister> Registers;
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mutable std::vector<Record*> SubRegIndices;
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mutable std::vector<CodeGenRegisterClass> RegisterClasses;
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mutable std::vector<MVT::SimpleValueType> LegalValueTypes;
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void ReadRegisters() const;
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void ReadSubRegIndices() const;
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void ReadRegisterClasses() const;
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void ReadInstructions() const;
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void ReadLegalValueTypes() const;
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mutable std::vector<const CodeGenInstruction*> InstrsByEnum;
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public:
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CodeGenTarget();
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Record *getTargetRecord() const { return TargetRec; }
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const std::string &getName() const;
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/// getInstNamespace - Return the target-specific instruction namespace.
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///
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std::string getInstNamespace() const;
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/// getInstructionSet - Return the InstructionSet object.
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///
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Record *getInstructionSet() const;
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/// getAsmParser - Return the AssemblyParser definition for this target.
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///
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Record *getAsmParser() const;
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/// getAsmWriter - Return the AssemblyWriter definition for this target.
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///
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Record *getAsmWriter() const;
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const std::vector<CodeGenRegister> &getRegisters() const {
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if (Registers.empty()) ReadRegisters();
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return Registers;
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}
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/// getRegisterByName - If there is a register with the specific AsmName,
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/// return it.
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const CodeGenRegister *getRegisterByName(StringRef Name) const;
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const std::vector<Record*> &getSubRegIndices() const {
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if (SubRegIndices.empty()) ReadSubRegIndices();
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return SubRegIndices;
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}
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// Map a SubRegIndex Record to its number.
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unsigned getSubRegIndexNo(Record *idx) const {
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if (SubRegIndices.empty()) ReadSubRegIndices();
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std::vector<Record*>::const_iterator i =
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std::find(SubRegIndices.begin(), SubRegIndices.end(), idx);
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assert(i != SubRegIndices.end() && "Not a SubRegIndex");
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return (i - SubRegIndices.begin()) + 1;
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}
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const std::vector<CodeGenRegisterClass> &getRegisterClasses() const {
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if (RegisterClasses.empty()) ReadRegisterClasses();
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return RegisterClasses;
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}
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const CodeGenRegisterClass &getRegisterClass(Record *R) const {
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const std::vector<CodeGenRegisterClass> &RC = getRegisterClasses();
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for (unsigned i = 0, e = RC.size(); i != e; ++i)
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if (RC[i].TheDef == R)
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return RC[i];
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assert(0 && "Didn't find the register class");
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abort();
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}
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/// getRegisterClassForRegister - Find the register class that contains the
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/// specified physical register. If the register is not in a register
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/// class, return null. If the register is in multiple classes, and the
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/// classes have a superset-subset relationship and the same set of
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/// types, return the superclass. Otherwise return null.
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const CodeGenRegisterClass *getRegisterClassForRegister(Record *R) const {
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const std::vector<CodeGenRegisterClass> &RCs = getRegisterClasses();
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const CodeGenRegisterClass *FoundRC = 0;
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for (unsigned i = 0, e = RCs.size(); i != e; ++i) {
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const CodeGenRegisterClass &RC = RegisterClasses[i];
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for (unsigned ei = 0, ee = RC.Elements.size(); ei != ee; ++ei) {
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if (R != RC.Elements[ei])
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continue;
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// If a register's classes have different types, return null.
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if (FoundRC && RC.getValueTypes() != FoundRC->getValueTypes())
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return 0;
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// If this is the first class that contains the register,
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// make a note of it and go on to the next class.
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if (!FoundRC) {
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FoundRC = &RC;
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break;
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}
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std::vector<Record *> Elements(RC.Elements);
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std::vector<Record *> FoundElements(FoundRC->Elements);
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std::sort(Elements.begin(), Elements.end());
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std::sort(FoundElements.begin(), FoundElements.end());
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// Check to see if the previously found class that contains
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// the register is a subclass of the current class. If so,
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// prefer the superclass.
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if (std::includes(Elements.begin(), Elements.end(),
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FoundElements.begin(), FoundElements.end())) {
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FoundRC = &RC;
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break;
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}
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// Check to see if the previously found class that contains
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// the register is a superclass of the current class. If so,
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// prefer the superclass.
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if (std::includes(FoundElements.begin(), FoundElements.end(),
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Elements.begin(), Elements.end()))
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break;
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// Multiple classes, and neither is a superclass of the other.
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// Return null.
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return 0;
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}
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}
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return FoundRC;
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}
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/// getRegisterVTs - Find the union of all possible SimpleValueTypes for the
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/// specified physical register.
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std::vector<MVT::SimpleValueType> getRegisterVTs(Record *R) const;
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const std::vector<MVT::SimpleValueType> &getLegalValueTypes() const {
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if (LegalValueTypes.empty()) ReadLegalValueTypes();
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return LegalValueTypes;
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}
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/// isLegalValueType - Return true if the specified value type is natively
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/// supported by the target (i.e. there are registers that directly hold it).
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bool isLegalValueType(MVT::SimpleValueType VT) const {
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const std::vector<MVT::SimpleValueType> &LegalVTs = getLegalValueTypes();
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for (unsigned i = 0, e = LegalVTs.size(); i != e; ++i)
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if (LegalVTs[i] == VT) return true;
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return false;
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}
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private:
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DenseMap<const Record*, CodeGenInstruction*> &getInstructions() const {
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if (Instructions.empty()) ReadInstructions();
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return Instructions;
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}
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public:
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CodeGenInstruction &getInstruction(const Record *InstRec) const {
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if (Instructions.empty()) ReadInstructions();
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DenseMap<const Record*, CodeGenInstruction*>::iterator I =
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Instructions.find(InstRec);
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assert(I != Instructions.end() && "Not an instruction");
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return *I->second;
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}
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/// getInstructionsByEnumValue - Return all of the instructions defined by the
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/// target, ordered by their enum value.
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const std::vector<const CodeGenInstruction*> &
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getInstructionsByEnumValue() const {
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if (InstrsByEnum.empty()) ComputeInstrsByEnum();
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return InstrsByEnum;
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}
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typedef std::vector<const CodeGenInstruction*>::const_iterator inst_iterator;
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inst_iterator inst_begin() const{return getInstructionsByEnumValue().begin();}
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inst_iterator inst_end() const { return getInstructionsByEnumValue().end(); }
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/// isLittleEndianEncoding - are instruction bit patterns defined as [0..n]?
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///
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bool isLittleEndianEncoding() const;
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private:
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void ComputeInstrsByEnum() const;
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};
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/// ComplexPattern - ComplexPattern info, corresponding to the ComplexPattern
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/// tablegen class in TargetSelectionDAG.td
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class ComplexPattern {
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MVT::SimpleValueType Ty;
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unsigned NumOperands;
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std::string SelectFunc;
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std::vector<Record*> RootNodes;
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unsigned Properties; // Node properties
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public:
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ComplexPattern() : NumOperands(0) {}
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ComplexPattern(Record *R);
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MVT::SimpleValueType getValueType() const { return Ty; }
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unsigned getNumOperands() const { return NumOperands; }
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const std::string &getSelectFunc() const { return SelectFunc; }
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const std::vector<Record*> &getRootNodes() const {
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return RootNodes;
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}
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bool hasProperty(enum SDNP Prop) const { return Properties & (1 << Prop); }
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};
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} // End llvm namespace
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#endif
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