/3rd_party/llvm/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 abort
 13// on error conditions.
 14//
 15//===----------------------------------------------------------------------===//
 16
 17#ifndef CODEGEN_TARGET_H
 18#define CODEGEN_TARGET_H
 19
 20#include "CodeGenInstruction.h"
 21#include "CodeGenRegisters.h"
 22#include "llvm/Support/raw_ostream.h"
 23#include "llvm/TableGen/Record.h"
 24#include <algorithm>
 25
 26namespace llvm {
 27
 28struct CodeGenRegister;
 29class CodeGenSchedModels;
 30class CodeGenTarget;
 31
 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.
 35enum SDNP {
 36  SDNPCommutative,
 37  SDNPAssociative,
 38  SDNPHasChain,
 39  SDNPOutGlue,
 40  SDNPInGlue,
 41  SDNPOptInGlue,
 42  SDNPMayLoad,
 43  SDNPMayStore,
 44  SDNPSideEffect,
 45  SDNPMemOperand,
 46  SDNPVariadic,
 47  SDNPWantRoot,
 48  SDNPWantParent
 49};
 50
 51/// getValueType - Return the MVT::SimpleValueType that the specified TableGen
 52/// record corresponds to.
 53MVT::SimpleValueType getValueType(Record *Rec);
 54
 55std::string getName(MVT::SimpleValueType T);
 56std::string getEnumName(MVT::SimpleValueType T);
 57
 58/// getQualifiedName - Return the name of the specified record, with a
 59/// namespace qualifier if the record contains one.
 60std::string getQualifiedName(const Record *R);
 61
 62/// CodeGenTarget - This class corresponds to the Target class in the .td files.
 63///
 64class CodeGenTarget {
 65  RecordKeeper &Records;
 66  Record *TargetRec;
 67
 68  mutable DenseMap<const Record*, CodeGenInstruction*> Instructions;
 69  mutable CodeGenRegBank *RegBank;
 70  mutable std::vector<Record*> RegAltNameIndices;
 71  mutable SmallVector<MVT::SimpleValueType, 8> LegalValueTypes;
 72  void ReadRegAltNameIndices() const;
 73  void ReadInstructions() const;
 74  void ReadLegalValueTypes() const;
 75
 76  mutable CodeGenSchedModels *SchedModels;
 77
 78  mutable std::vector<const CodeGenInstruction*> InstrsByEnum;
 79public:
 80  CodeGenTarget(RecordKeeper &Records);
 81  ~CodeGenTarget();
 82
 83  Record *getTargetRecord() const { return TargetRec; }
 84  const std::string &getName() const;
 85
 86  /// getInstNamespace - Return the target-specific instruction namespace.
 87  ///
 88  std::string getInstNamespace() const;
 89
 90  /// getInstructionSet - Return the InstructionSet object.
 91  ///
 92  Record *getInstructionSet() const;
 93
 94  /// getAsmParser - Return the AssemblyParser definition for this target.
 95  ///
 96  Record *getAsmParser() const;
 97
 98  /// getAsmParserVariant - Return the AssmblyParserVariant definition for
 99  /// this target.
100  ///
101  Record *getAsmParserVariant(unsigned i) const;
102
103  /// getAsmParserVariantCount - Return the AssmblyParserVariant definition
104  /// available for this target.
105  ///
106  unsigned getAsmParserVariantCount() const;
107
108  /// getAsmWriter - Return the AssemblyWriter definition for this target.
109  ///
110  Record *getAsmWriter() const;
111
112  /// getRegBank - Return the register bank description.
113  CodeGenRegBank &getRegBank() const;
114
115  /// getRegisterByName - If there is a register with the specific AsmName,
116  /// return it.
117  const CodeGenRegister *getRegisterByName(StringRef Name) const;
118
119  const std::vector<Record*> &getRegAltNameIndices() const {
120    if (RegAltNameIndices.empty()) ReadRegAltNameIndices();
121    return RegAltNameIndices;
122  }
123
124  const CodeGenRegisterClass &getRegisterClass(Record *R) const {
125    return *getRegBank().getRegClass(R);
126  }
127
128  /// getRegisterVTs - Find the union of all possible SimpleValueTypes for the
129  /// specified physical register.
130  std::vector<MVT::SimpleValueType> getRegisterVTs(Record *R) const;
131
132  ArrayRef<MVT::SimpleValueType> getLegalValueTypes() const {
133    if (LegalValueTypes.empty()) ReadLegalValueTypes();
134    return LegalValueTypes;
135  }
136
137  /// isLegalValueType - Return true if the specified value type is natively
138  /// supported by the target (i.e. there are registers that directly hold it).
139  bool isLegalValueType(MVT::SimpleValueType VT) const {
140    ArrayRef<MVT::SimpleValueType> LegalVTs = getLegalValueTypes();
141    for (unsigned i = 0, e = LegalVTs.size(); i != e; ++i)
142      if (LegalVTs[i] == VT) return true;
143    return false;
144  }
145
146  CodeGenSchedModels &getSchedModels() const;
147
148private:
149  DenseMap<const Record*, CodeGenInstruction*> &getInstructions() const {
150    if (Instructions.empty()) ReadInstructions();
151    return Instructions;
152  }
153public:
154
155  CodeGenInstruction &getInstruction(const Record *InstRec) const {
156    if (Instructions.empty()) ReadInstructions();
157    DenseMap<const Record*, CodeGenInstruction*>::iterator I =
158      Instructions.find(InstRec);
159    assert(I != Instructions.end() && "Not an instruction");
160    return *I->second;
161  }
162
163  /// getInstructionsByEnumValue - Return all of the instructions defined by the
164  /// target, ordered by their enum value.
165  const std::vector<const CodeGenInstruction*> &
166  getInstructionsByEnumValue() const {
167    if (InstrsByEnum.empty()) ComputeInstrsByEnum();
168    return InstrsByEnum;
169  }
170
171  typedef std::vector<const CodeGenInstruction*>::const_iterator inst_iterator;
172  inst_iterator inst_begin() const{return getInstructionsByEnumValue().begin();}
173  inst_iterator inst_end() const { return getInstructionsByEnumValue().end(); }
174
175
176  /// isLittleEndianEncoding - are instruction bit patterns defined as  [0..n]?
177  ///
178  bool isLittleEndianEncoding() const;
179
180  /// guessInstructionProperties - should we just guess unset instruction
181  /// properties?
182  bool guessInstructionProperties() const;
183
184private:
185  void ComputeInstrsByEnum() const;
186};
187
188/// ComplexPattern - ComplexPattern info, corresponding to the ComplexPattern
189/// tablegen class in TargetSelectionDAG.td
190class ComplexPattern {
191  MVT::SimpleValueType Ty;
192  unsigned NumOperands;
193  std::string SelectFunc;
194  std::vector<Record*> RootNodes;
195  unsigned Properties; // Node properties
196public:
197  ComplexPattern() : NumOperands(0) {}
198  ComplexPattern(Record *R);
199
200  MVT::SimpleValueType getValueType() const { return Ty; }
201  unsigned getNumOperands() const { return NumOperands; }
202  const std::string &getSelectFunc() const { return SelectFunc; }
203  const std::vector<Record*> &getRootNodes() const {
204    return RootNodes;
205  }
206  bool hasProperty(enum SDNP Prop) const { return Properties & (1 << Prop); }
207};
208
209} // End llvm namespace
210
211#endif