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) {
39 /// Terminators must implement the methods required by Instruction...
40 virtual Instruction *clone() const = 0;
42 /// Additionally, they must provide a method to get at the successors of this
43 /// terminator instruction. 'idx' may not be >= the number of successors
44 /// returned by getNumSuccessors()!
46 virtual const BasicBlock *getSuccessor(unsigned idx) const = 0;
47 virtual unsigned getNumSuccessors() const = 0;
49 /// Set a successor at a given index
50 virtual void setSuccessor(unsigned idx, BasicBlock *B) = 0;
52 inline BasicBlock *getSuccessor(unsigned idx) {
53 return (BasicBlock*)((const TerminatorInst *)this)->getSuccessor(idx);
56 // Methods for support type inquiry through isa, cast, and dyn_cast:
57 static inline bool classof(const TerminatorInst *) { return true; }
58 static inline bool classof(const Instruction *I) {
59 return I->getOpcode() >= TermOpsBegin && I->getOpcode() < TermOpsEnd;
61 static inline bool classof(const Value *V) {
62 return isa<Instruction>(V) && classof(cast<Instruction>(V));
67 //===----------------------------------------------------------------------===//
68 // BinaryOperator Class
69 //===----------------------------------------------------------------------===//
71 class BinaryOperator : public Instruction {
73 BinaryOperator(BinaryOps iType, Value *S1, Value *S2, const Type *Ty,
74 const std::string &Name, Instruction *InsertBefore);
78 /// create() - Construct a binary instruction, given the opcode and the two
79 /// operands. Optionally (if InstBefore is specified) insert the instruction
80 /// into a BasicBlock right before the specified instruction. The specified
81 /// Instruction is allowed to be a dereferenced end iterator.
83 static BinaryOperator *create(BinaryOps Op, Value *S1, Value *S2,
84 const std::string &Name = "",
85 Instruction *InsertBefore = 0);
88 /// Helper functions to construct and inspect unary operations (NEG and NOT)
89 /// via binary operators SUB and XOR:
91 /// createNeg, createNot - Create the NEG and NOT
92 /// instructions out of SUB and XOR instructions.
94 static BinaryOperator *createNeg(Value *Op, const std::string &Name = "",
95 Instruction *InsertBefore = 0);
96 static BinaryOperator *createNot(Value *Op, const std::string &Name = "",
97 Instruction *InsertBefore = 0);
99 /// isNeg, isNot - Check if the given Value is a NEG or NOT instruction.
101 static bool isNeg(const Value *V);
102 static bool isNot(const Value *V);
104 /// getNegArgument, getNotArgument - Helper functions to extract the
105 /// unary argument of a NEG or NOT operation implemented via Sub or Xor.
107 static const Value* getNegArgument(const BinaryOperator* Bop);
108 static Value* getNegArgument( BinaryOperator* Bop);
109 static const Value* getNotArgument(const BinaryOperator* Bop);
110 static Value* getNotArgument( BinaryOperator* Bop);
112 BinaryOps getOpcode() const {
113 return (BinaryOps)Instruction::getOpcode();
116 virtual Instruction *clone() const {
117 return create(getOpcode(), Operands[0], Operands[1]);
120 /// swapOperands - Exchange the two operands to this instruction.
121 /// This instruction is safe to use on any binary instruction and
122 /// does not modify the semantics of the instruction. If the
123 /// instruction is order dependent (SetLT f.e.) the opcode is
124 /// changed. If the instruction cannot be reversed (ie, it's a Div),
125 /// then return true.
129 // Methods for support type inquiry through isa, cast, and dyn_cast:
130 static inline bool classof(const BinaryOperator *) { return true; }
131 static inline bool classof(const Instruction *I) {
132 return I->getOpcode() >= BinaryOpsBegin && I->getOpcode() < BinaryOpsEnd;
134 static inline bool classof(const Value *V) {
135 return isa<Instruction>(V) && classof(cast<Instruction>(V));
139 } // End llvm namespace