CodeGenTarget.h revision 327952 
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 LLVM_UTILS_TABLEGEN_CODEGENTARGET_H
18#define LLVM_UTILS_TABLEGEN_CODEGENTARGET_H
19
20#include "CodeGenHwModes.h"
21#include "CodeGenInstruction.h"
22#include "CodeGenRegisters.h"
23#include "InfoByHwMode.h"
24#include "SDNodeProperties.h"
25#include "llvm/Support/raw_ostream.h"
26#include "llvm/TableGen/Record.h"
27#include <algorithm>
28
29namespace llvm {
30
31struct CodeGenRegister;
32class CodeGenSchedModels;
33class CodeGenTarget;
34
35/// getValueType - Return the MVT::SimpleValueType that the specified TableGen
36/// record corresponds to.
37MVT::SimpleValueType getValueType(Record *Rec);
38
39StringRef getName(MVT::SimpleValueType T);
40StringRef getEnumName(MVT::SimpleValueType T);
41
42/// getQualifiedName - Return the name of the specified record, with a
43/// namespace qualifier if the record contains one.
44std::string getQualifiedName(const Record *R);
45
46/// CodeGenTarget - This class corresponds to the Target class in the .td files.
47///
48class CodeGenTarget {
49  RecordKeeper &Records;
50  Record *TargetRec;
51
52  mutable DenseMap<const Record*,
53                   std::unique_ptr<CodeGenInstruction>> Instructions;
54  mutable std::unique_ptr<CodeGenRegBank> RegBank;
55  mutable std::vector<Record*> RegAltNameIndices;
56  mutable SmallVector<ValueTypeByHwMode, 8> LegalValueTypes;
57  CodeGenHwModes CGH;
58  void ReadRegAltNameIndices() const;
59  void ReadInstructions() const;
60  void ReadLegalValueTypes() const;
61
62  mutable std::unique_ptr<CodeGenSchedModels> SchedModels;
63
64  mutable std::vector<const CodeGenInstruction*> InstrsByEnum;
65public:
66  CodeGenTarget(RecordKeeper &Records);
67  ~CodeGenTarget();
68
69  Record *getTargetRecord() const { return TargetRec; }
70  const StringRef getName() const;
71
72  /// getInstNamespace - Return the target-specific instruction namespace.
73  ///
74  StringRef getInstNamespace() const;
75
76  /// getInstructionSet - Return the InstructionSet object.
77  ///
78  Record *getInstructionSet() const;
79
80  /// getAsmParser - Return the AssemblyParser definition for this target.
81  ///
82  Record *getAsmParser() const;
83
84  /// getAsmParserVariant - Return the AssmblyParserVariant definition for
85  /// this target.
86  ///
87  Record *getAsmParserVariant(unsigned i) const;
88
89  /// getAsmParserVariantCount - Return the AssmblyParserVariant definition
90  /// available for this target.
91  ///
92  unsigned getAsmParserVariantCount() 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 CodeGenRegisterClass &getRegisterClass(Record *R) const {
111    return *getRegBank().getRegClass(R);
112  }
113
114  /// getRegisterVTs - Find the union of all possible SimpleValueTypes for the
115  /// specified physical register.
116  std::vector<ValueTypeByHwMode> getRegisterVTs(Record *R) const;
117
118  ArrayRef<ValueTypeByHwMode> getLegalValueTypes() const {
119    if (LegalValueTypes.empty())
120      ReadLegalValueTypes();
121    return LegalValueTypes;
122  }
123
124  CodeGenSchedModels &getSchedModels() const;
125
126  const CodeGenHwModes &getHwModes() const { return CGH; }
127
128private:
129  DenseMap<const Record*, std::unique_ptr<CodeGenInstruction>> &
130  getInstructions() const {
131    if (Instructions.empty()) ReadInstructions();
132    return Instructions;
133  }
134public:
135
136  CodeGenInstruction &getInstruction(const Record *InstRec) const {
137    if (Instructions.empty()) ReadInstructions();
138    auto I = Instructions.find(InstRec);
139    assert(I != Instructions.end() && "Not an instruction");
140    return *I->second;
141  }
142
143  /// getInstructionsByEnumValue - Return all of the instructions defined by the
144  /// target, ordered by their enum value.
145  ArrayRef<const CodeGenInstruction *>
146  getInstructionsByEnumValue() const {
147    if (InstrsByEnum.empty()) ComputeInstrsByEnum();
148    return InstrsByEnum;
149  }
150
151  typedef ArrayRef<const CodeGenInstruction *>::const_iterator inst_iterator;
152  inst_iterator inst_begin() const{return getInstructionsByEnumValue().begin();}
153  inst_iterator inst_end() const { return getInstructionsByEnumValue().end(); }
154
155
156  /// isLittleEndianEncoding - are instruction bit patterns defined as  [0..n]?
157  ///
158  bool isLittleEndianEncoding() const;
159
160  /// reverseBitsForLittleEndianEncoding - For little-endian instruction bit
161  /// encodings, reverse the bit order of all instructions.
162  void reverseBitsForLittleEndianEncoding();
163
164  /// guessInstructionProperties - should we just guess unset instruction
165  /// properties?
166  bool guessInstructionProperties() 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
180  unsigned Complexity;
181public:
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  unsigned getComplexity() const { return Complexity; }
192};
193
194} // End llvm namespace
195
196#endif
197