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Add new UnreachableInst class

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17037 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-10-16 18:05:54 +00:00
parent 731cde9447
commit 076b3f1693
1 changed files with 37 additions and 0 deletions
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37
include/llvm/Instructions.h
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@ -1187,6 +1187,43 @@ struct UnwindInst : public TerminatorInst {
}
};
//===----------------------------------------------------------------------===//
// UnreachableInst Class
//===----------------------------------------------------------------------===//
//===---------------------------------------------------------------------------
/// UnreachableInst - This function has undefined behavior. In particular, the
/// presence of this instruction indicates some higher level knowledge that the
/// end of the block cannot be reached.
///
struct UnreachableInst : public TerminatorInst {
UnreachableInst(Instruction *InsertBefore = 0)
: TerminatorInst(Instruction::Unreachable, InsertBefore) {
}
UnreachableInst(BasicBlock *InsertAtEnd)
: TerminatorInst(Instruction::Unreachable, InsertAtEnd) {
}
virtual UnreachableInst *clone() const;
virtual const BasicBlock *getSuccessor(unsigned idx) const {
assert(0 && "UnreachableInst has no successors!");
abort();
return 0;
}
virtual void setSuccessor(unsigned idx, BasicBlock *NewSucc);
virtual unsigned getNumSuccessors() const { return 0; }
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const UnreachableInst *) { return true; }
static inline bool classof(const Instruction *I) {
return I->getOpcode() == Instruction::Unreachable;
}
static inline bool classof(const Value *V) {
return isa<Instruction>(V) && classof(cast<Instruction>(V));
}
};
} // End llvm namespace
#endif