[WinEH] Store pointers to the LSDA in the exception registration object

[oota-llvm.git] / lib / Target / X86 / X86ISelLowering.cpp

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 964a599e8815cf03e124b0b2207bc8a14f027d99..de28fdbb229d26e79828fe89e4aa2daba0e14501 100644 (file)
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -15288,6 +15288,24 @@ static SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, const X86Subtarget *Subtarget
     SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::i32);
     return DAG.getNode(Opcode, dl, VTs, NewOps);
   }
+
+  case Intrinsic::x86_seh_lsda: {
+    // Compute the symbol for the LSDA. We know it'll get emitted later.
+    MachineFunction &MF = DAG.getMachineFunction();
+    SDValue Op1 = Op.getOperand(1);
+    Op1->dump();
+    auto *Fn = cast<Function>(cast<GlobalAddressSDNode>(Op1)->getGlobal());
+    MCSymbol *LSDASym = MF.getMMI().getContext().getOrCreateLSDASymbol(
+        GlobalValue::getRealLinkageName(Fn->getName()));
+    StringRef Name = LSDASym->getName();
+    assert(Name.data()[Name.size()] == '\0' && "not null terminated");
+
+    // Generate a simple absolute symbol reference. This intrinsic is only
+    // supported on 32-bit Windows, which isn't PIC.
+    SDValue Result =
+        DAG.getTargetExternalSymbol(Name.data(), VT, X86II::MO_NOPREFIX);
+    return DAG.getNode(X86ISD::Wrapper, dl, VT, Result);
+  }
   }
 }