CodeGenTarget.h revision 225736 
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
26namespace llvm {
27
28struct CodeGenRegister;
29class 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.
34enum 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.
52MVT::SimpleValueType getValueType(Record *Rec);
53
54std::string getName(MVT::SimpleValueType T);
55std::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.
59std::string getQualifiedName(const Record *R);
60
61/// CodeGenTarget - This class corresponds to the Target class in the .td files.
62///
63class 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;
76public:
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
136private:
137  DenseMap<const Record*, CodeGenInstruction*> &getInstructions() const {
138    if (Instructions.empty()) ReadInstructions();
139    return Instructions;
140  }
141public:
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
168private:
169  void ComputeInstrsByEnum() const;
170};
171
172/// ComplexPattern - ComplexPattern info, corresponding to the ComplexPattern
173/// tablegen class in TargetSelectionDAG.td
174class ComplexPattern {
175  MVT::SimpleValueType Ty;
176  unsigned NumOperands;
177  std::string SelectFunc;
178  std::vector<Record*> RootNodes;
179  unsigned Properties; // Node properties
180public:
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