Re-commit "[SEH] Remove the old __C_specific_handler code now that WinEHPrepare works"

[oota-llvm.git] / lib / CodeGen / SelectionDAG / SelectionDAGISel.cpp

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 982d719ca1d731a50eec4ff326c2e71e7c7d35ae..f3735cb5315d5b3e329927b2c808951f1f439a99 100644 (file)
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -955,76 +955,20 @@ bool SelectionDAGISel::PrepareEHLandingPad() {
         // Mark the clause as a landing pad or MI passes will delete it.
         ClauseBB->setIsLandingPad();
       }
-    } else {
-      // Otherwise, we haven't done the preparation, and we need to invent some
-      // clause basic blocks that branch into the landingpad.
-      // FIXME: Remove this code once SEH preparation works.
-      ActionsCall = nullptr;
-
-      // Make virtual registers and a series of labels that fill in values for
-      // the clauses.
-      auto &RI = MF->getRegInfo();
-      FuncInfo->ExceptionSelectorVirtReg = RI.createVirtualRegister(PtrRC);
-
-      // Emit separate machine basic blocks with separate labels for each clause
-      // before the main landing pad block.
-      MachineInstrBuilder SelectorPHI = BuildMI(
-          *MBB, MBB->begin(), SDB->getCurDebugLoc(),
-          TII->get(TargetOpcode::PHI), FuncInfo->ExceptionSelectorVirtReg);
-      for (unsigned I = 0, E = LPadInst->getNumClauses(); I != E; ++I) {
-        // Skip filter clauses, we can't implement them.
-        if (LPadInst->isFilter(I))
-          continue;
-
-        MachineBasicBlock *ClauseBB = MF->CreateMachineBasicBlock(LLVMBB);
-        MF->insert(MBB, ClauseBB);
-
-        // Add the edge from the invoke to the clause.
-        for (MachineBasicBlock *InvokeBB : InvokeBBs)
-          InvokeBB->addSuccessor(ClauseBB);
-
-        // Mark the clause as a landing pad or MI passes will delete it.
-        ClauseBB->setIsLandingPad();
-
-        GlobalValue *ClauseGV = ExtractTypeInfo(LPadInst->getClause(I));
-
-        // Start the BB with a label.
-        MCSymbol *ClauseLabel = MF->getMMI().addClauseForLandingPad(MBB);
-        BuildMI(*ClauseBB, ClauseBB->begin(), SDB->getCurDebugLoc(), II)
-            .addSym(ClauseLabel);
-
-        // Construct a simple BB that defines a register with the typeid
-        // constant.
-        FuncInfo->MBB = ClauseBB;
-        FuncInfo->InsertPt = ClauseBB->end();
-        unsigned VReg = SDB->visitLandingPadClauseBB(ClauseGV, MBB);
-        CurDAG->setRoot(SDB->getRoot());
-        SDB->clear();
-        CodeGenAndEmitDAG();
-
-        // Add the typeid virtual register to the phi in the main landing pad.
-        SelectorPHI.addReg(VReg).addMBB(ClauseBB);
-      }
     }
 
     // Remove the edge from the invoke to the lpad.
     for (MachineBasicBlock *InvokeBB : InvokeBBs)
       InvokeBB->removeSuccessor(MBB);
 
-    // Restore FuncInfo back to its previous state and select the main landing
-    // pad block.
-    FuncInfo->MBB = MBB;
-    FuncInfo->InsertPt = MBB->end();
-
     // Transfer EH state number assigned to the IR block to the MBB.
     if (Personality == EHPersonality::MSVC_CXX) {
       WinEHFuncInfo &FI = MF->getMMI().getWinEHFuncInfo(MF->getFunction());
       MF->getMMI().addWinEHState(MBB, FI.LandingPadStateMap[LPadInst]);
     }
 
-    // Select instructions for the landingpad if there was no llvm.eh.actions
-    // call.
-    return ActionsCall == nullptr;
+    // Don't select instructions for the landingpad.
+    return false;
   }
 
   // Mark exception register as live in.