[llvm-commits] [llvm] r137873 - /llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

[Bill Wendling]

Author: void
Date: Wed Aug 17 16:25:14 2011
New Revision: 137873

URL: http://llvm.org/viewvc/llvm-project?rev=137873&view=rev
Log:
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.

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp?rev=137873&r1=137872&r2=137873&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp Wed Aug 17 16:25:14 2011
@@ -1814,6 +1814,45 @@
   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 @@
                            &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();