Add the unwind instruction class

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8405 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/iTerminators.h b/include/llvm/iTerminators.h
index 434fe671d6d4f5f013b0ab0c3d4afef3e501a3ec..467df4d46590da21c8285313f667d168b8ca0944 100644 (file)
--- a/include/llvm/iTerminators.h
+++ b/include/llvm/iTerminators.h
@@ -61,7 +61,6 @@ public:
   }
 };
 
-
 //===---------------------------------------------------------------------------
 // BranchInst - Conditional or Unconditional Branch instruction.
 //
@@ -270,4 +269,36 @@ public:
   }
 };
 
+
+//===---------------------------------------------------------------------------
+/// UnwindInst - Immediately exit the current function, unwinding the stack
+/// until an invoke instruction is found.
+///
+struct UnwindInst : public TerminatorInst {
+  UnwindInst(Instruction *InsertBefore = 0)
+    : TerminatorInst(Instruction::Unwind, InsertBefore) {
+  }
+
+  virtual Instruction *clone() const { return new UnwindInst(); }
+
+  virtual const BasicBlock *getSuccessor(unsigned idx) const {
+    assert(0 && "UnwindInst has no successors!");
+    abort();
+    return 0;
+  }
+  virtual void setSuccessor(unsigned idx, BasicBlock *NewSucc) {
+    assert(0 && "UnwindInst has no successors!");
+  }
+  virtual unsigned getNumSuccessors() const { return 0; }
+
+  // Methods for support type inquiry through isa, cast, and dyn_cast:
+  static inline bool classof(const UnwindInst *) { return true; }
+  static inline bool classof(const Instruction *I) {
+    return I->getOpcode() == Instruction::Unwind;
+  }
+  static inline bool classof(const Value *V) {
+    return isa<Instruction>(V) && classof(cast<Instruction>(V));
+  }
+};
+
 #endif