From 4eb20621438eb98fdbcdb0b224de7609d5ef76f2 Mon Sep 17 00:00:00 2001
From: Bill Wendling <isanbard@gmail.com>
Date: Wed, 17 Aug 2011 21:25:14 +0000
Subject: [PATCH] Add the body of 'visitLandingPad'.

This generates the SDNodes for the new exception handling scheme. It takes the
two values coming from the landingpad instruction and assigns them to the
EXCEPTIONADDR and EHSELECTION nodes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137873 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../SelectionDAG/SelectionDAGBuilder.cpp      | 42 +++++++++++++++++--
 1 file changed, 39 insertions(+), 3 deletions(-)

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index c1d533582fd..66a9aab76c5 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -1814,6 +1814,45 @@ void SelectionDAGBuilder::visitResume(const ResumeInst &RI) {
   llvm_unreachable("SelectionDAGBuilder shouldn't visit resume instructions!");
 }
 
+void SelectionDAGBuilder::visitLandingPad(const LandingPadInst &LP) {
+  assert(FuncInfo.MBB->isLandingPad() &&
+         "Call to landingpad not in landing pad!");
+
+  MachineBasicBlock *MBB = FuncInfo.MBB;
+  MachineModuleInfo &MMI = DAG.getMachineFunction().getMMI();
+  AddLandingPadInfo(LP, MMI, MBB);
+
+  SmallVector<EVT, 2> ValueVTs;
+  ComputeValueVTs(TLI, LP.getType(), ValueVTs);
+
+  // Insert the EXCEPTIONADDR instruction.
+  assert(FuncInfo.MBB->isLandingPad() &&
+         "Call to eh.exception not in landing pad!");
+  SDVTList VTs = DAG.getVTList(TLI.getPointerTy(), MVT::Other);
+  SDValue Ops[2];
+  Ops[0] = DAG.getRoot();
+  SDValue Op1 = DAG.getNode(ISD::EXCEPTIONADDR, getCurDebugLoc(), VTs, Ops, 1);
+  SDValue Chain = Op1.getValue(1);
+
+  // Insert the EHSELECTION instruction.
+  VTs = DAG.getVTList(TLI.getPointerTy(), MVT::Other);
+  Ops[0] = Op1;
+  Ops[1] = Chain;
+  SDValue Op2 = DAG.getNode(ISD::EHSELECTION, getCurDebugLoc(), VTs, Ops, 2);
+  Chain = Op2.getValue(1);
+  Op2 = DAG.getSExtOrTrunc(Op2, getCurDebugLoc(), MVT::i32);
+
+  Ops[0] = Op1;
+  Ops[1] = Op2;
+  SDValue Res = DAG.getNode(ISD::MERGE_VALUES, getCurDebugLoc(),
+                            DAG.getVTList(&ValueVTs[0], ValueVTs.size()),
+                            &Ops[0], 2);
+
+  std::pair<SDValue, SDValue> RetPair = std::make_pair(Res, Chain);
+  setValue(&LP, RetPair.first);
+  DAG.setRoot(RetPair.second);
+}
+
 /// handleSmallSwitchCaseRange - Emit a series of specific tests (suitable for
 /// small case ranges).
 bool SelectionDAGBuilder::handleSmallSwitchRange(CaseRec& CR,
@@ -2985,9 +3024,6 @@ void SelectionDAGBuilder::visitExtractValue(const ExtractValueInst &I) {
                            &Values[0], NumValValues));
 }
 
-void SelectionDAGBuilder::visitLandingPad(const LandingPadInst &I) {
-}
-
 void SelectionDAGBuilder::visitGetElementPtr(const User &I) {
   SDValue N = getValue(I.getOperand(0));
   Type *Ty = I.getOperand(0)->getType();