Add the 'resume' instruction for the new EH rewrite.

This adds the 'resume' instruction class, IR parsing, and bitcode reading and
writing. The 'resume' instruction resumes propagation of an existing (in-flight)
exception whose unwinding was interrupted with a 'landingpad' instruction (to be
added later).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136589 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 39 insertions, 0 deletions

diff --git a/lib/VMCore/Instructions.cpp b/lib/VMCore/Instructions.cpp
index 75458babfb..c36102d706 100644
--- a/lib/VMCore/Instructions.cpp
+++ b/lib/VMCore/Instructions.cpp
@@ -574,6 +574,41 @@ BasicBlock *UnwindInst::getSuccessorV(unsigned idx) const {
 }
 
 //===----------------------------------------------------------------------===//
+//                        ResumeInst Implementation
+//===----------------------------------------------------------------------===//
+
+ResumeInst::ResumeInst(const ResumeInst &RI)
+  : TerminatorInst(Type::getVoidTy(RI.getContext()), Instruction::Resume,
+                   OperandTraits<ResumeInst>::op_begin(this), 1) {
+  Op<0>() = RI.Op<0>();
+}
+
+ResumeInst::ResumeInst(Value *Exn, Instruction *InsertBefore)
+  : TerminatorInst(Type::getVoidTy(Exn->getContext()), Instruction::Resume,
+                   OperandTraits<ResumeInst>::op_begin(this), 1, InsertBefore) {
+  Op<0>() = Exn;
+}
+
+ResumeInst::ResumeInst(Value *Exn, BasicBlock *InsertAtEnd)
+  : TerminatorInst(Type::getVoidTy(Exn->getContext()), Instruction::Resume,
+                   OperandTraits<ResumeInst>::op_begin(this), 1, InsertAtEnd) {
+  Op<0>() = Exn;
+}
+
+unsigned ResumeInst::getNumSuccessorsV() const {
+  return getNumSuccessors();
+}
+
+void ResumeInst::setSuccessorV(unsigned idx, BasicBlock *NewSucc) {
+  llvm_unreachable("ResumeInst has no successors!");
+}
+
+BasicBlock *ResumeInst::getSuccessorV(unsigned idx) const {
+  llvm_unreachable("ResumeInst has no successors!");
+  return 0;
+}
+
+//===----------------------------------------------------------------------===//
 //                      UnreachableInst Implementation
 //===----------------------------------------------------------------------===//
 
@@ -3254,6 +3289,10 @@ InvokeInst *InvokeInst::clone_impl() const {
   return new(getNumOperands()) InvokeInst(*this);
 }
 
+ResumeInst *ResumeInst::clone_impl() const {
+  return new(1) ResumeInst(*this);
+}
+
 UnwindInst *UnwindInst::clone_impl() const {
   LLVMContext &Context = getContext();
   return new UnwindInst(Context);