1 //===-- llvm/InstrTypes.h - Important Instruction subclasses ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines various meta classes of instructions that exist in the VM
11 // representation. Specific concrete subclasses of these may be found in the
14 //===----------------------------------------------------------------------===//
16 #ifndef LLVM_INSTRUCTION_TYPES_H
17 #define LLVM_INSTRUCTION_TYPES_H
19 #include "llvm/Instruction.h"
23 //===----------------------------------------------------------------------===//
24 // TerminatorInst Class
25 //===----------------------------------------------------------------------===//
27 /// TerminatorInst - Subclasses of this class are all able to terminate a basic
28 /// block. Thus, these are all the flow control type of operations.
30 class TerminatorInst : public Instruction {
32 TerminatorInst(Instruction::TermOps iType, Instruction *InsertBefore = 0);
33 TerminatorInst(const Type *Ty, Instruction::TermOps iType,
34 const std::string &Name = "", Instruction *InsertBefore = 0)
35 : Instruction(Ty, iType, Name, InsertBefore) {}
37 TerminatorInst(Instruction::TermOps iType, BasicBlock *InsertAtEnd);
38 TerminatorInst(const Type *Ty, Instruction::TermOps iType,
39 const std::string &Name, BasicBlock *InsertAtEnd)
40 : Instruction(Ty, iType, Name, InsertAtEnd) {}
44 /// Terminators must implement the methods required by Instruction...
45 virtual Instruction *clone() const = 0;
47 /// Additionally, they must provide a method to get at the successors of this
48 /// terminator instruction. 'idx' may not be >= the number of successors
49 /// returned by getNumSuccessors()!
51 virtual const BasicBlock *getSuccessor(unsigned idx) const = 0;
52 virtual unsigned getNumSuccessors() const = 0;
54 /// Set a successor at a given index
55 virtual void setSuccessor(unsigned idx, BasicBlock *B) = 0;
57 inline BasicBlock *getSuccessor(unsigned idx) {
58 const TerminatorInst *TI = this;
59 return const_cast<BasicBlock*>(TI->getSuccessor(idx));
62 // Methods for support type inquiry through isa, cast, and dyn_cast:
63 static inline bool classof(const TerminatorInst *) { return true; }
64 static inline bool classof(const Instruction *I) {
65 return I->getOpcode() >= TermOpsBegin && I->getOpcode() < TermOpsEnd;
67 static inline bool classof(const Value *V) {
68 return isa<Instruction>(V) && classof(cast<Instruction>(V));
73 //===----------------------------------------------------------------------===//
74 // BinaryOperator Class
75 //===----------------------------------------------------------------------===//
77 class BinaryOperator : public Instruction {
79 void init(BinaryOps iType, Value *S1, Value *S2);
80 BinaryOperator(BinaryOps iType, Value *S1, Value *S2, const Type *Ty,
81 const std::string &Name, Instruction *InsertBefore)
82 : Instruction(Ty, iType, Name, InsertBefore) {
85 BinaryOperator(BinaryOps iType, Value *S1, Value *S2, const Type *Ty,
86 const std::string &Name, BasicBlock *InsertAtEnd)
87 : Instruction(Ty, iType, Name, InsertAtEnd) {
93 /// create() - Construct a binary instruction, given the opcode and the two
94 /// operands. Optionally (if InstBefore is specified) insert the instruction
95 /// into a BasicBlock right before the specified instruction. The specified
96 /// Instruction is allowed to be a dereferenced end iterator.
98 static BinaryOperator *create(BinaryOps Op, Value *S1, Value *S2,
99 const std::string &Name = "",
100 Instruction *InsertBefore = 0);
102 /// create() - Construct a binary instruction, given the opcode and the two
103 /// operands. Also automatically insert this instruction to the end of the
104 /// BasicBlock specified.
106 static BinaryOperator *create(BinaryOps Op, Value *S1, Value *S2,
107 const std::string &Name,
108 BasicBlock *InsertAtEnd);
111 /// Helper functions to construct and inspect unary operations (NEG and NOT)
112 /// via binary operators SUB and XOR:
114 /// createNeg, createNot - Create the NEG and NOT
115 /// instructions out of SUB and XOR instructions.
117 static BinaryOperator *createNeg(Value *Op, const std::string &Name = "",
118 Instruction *InsertBefore = 0);
119 static BinaryOperator *createNeg(Value *Op, const std::string &Name,
120 BasicBlock *InsertAtEnd);
121 static BinaryOperator *createNot(Value *Op, const std::string &Name = "",
122 Instruction *InsertBefore = 0);
123 static BinaryOperator *createNot(Value *Op, const std::string &Name,
124 BasicBlock *InsertAtEnd);
126 /// isNeg, isNot - Check if the given Value is a NEG or NOT instruction.
128 static bool isNeg(const Value *V);
129 static bool isNot(const Value *V);
131 /// getNegArgument, getNotArgument - Helper functions to extract the
132 /// unary argument of a NEG or NOT operation implemented via Sub or Xor.
134 static const Value* getNegArgument(const BinaryOperator* Bop);
135 static Value* getNegArgument( BinaryOperator* Bop);
136 static const Value* getNotArgument(const BinaryOperator* Bop);
137 static Value* getNotArgument( BinaryOperator* Bop);
139 BinaryOps getOpcode() const {
140 return static_cast<BinaryOps>(Instruction::getOpcode());
143 virtual Instruction *clone() const {
144 return create(getOpcode(), Operands[0], Operands[1]);
147 /// swapOperands - Exchange the two operands to this instruction.
148 /// This instruction is safe to use on any binary instruction and
149 /// does not modify the semantics of the instruction. If the
150 /// instruction is order dependent (SetLT f.e.) the opcode is
151 /// changed. If the instruction cannot be reversed (ie, it's a Div),
152 /// then return true.
156 // Methods for support type inquiry through isa, cast, and dyn_cast:
157 static inline bool classof(const BinaryOperator *) { return true; }
158 static inline bool classof(const Instruction *I) {
159 return I->getOpcode() >= BinaryOpsBegin && I->getOpcode() < BinaryOpsEnd;
161 static inline bool classof(const Value *V) {
162 return isa<Instruction>(V) && classof(cast<Instruction>(V));
166 } // End llvm namespace