[llvm] r241597 - [WinEH] Add a report_fatal_error for 32-bit stack realignment

[Reid Kleckner]

Author: rnk
Date: Tue Jul  7 10:47:29 2015
New Revision: 241597

URL: http://llvm.org/viewvc/llvm-project?rev=241597&view=rev
Log:
[WinEH] Add a report_fatal_error for 32-bit stack realignment

This type of prologue isn't supported yet. Implementing it should be a
matter of copying the adjusted incoming EBP into ESI (the base pointer)
instead of EBP.  The original EBP can be saved and restored from other
memory afterwards.

Modified:
    llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=241597&r1=241596&r2=241597&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Tue Jul  7 10:47:29 2015
@@ -15953,6 +15953,9 @@ static SDValue LowerSEHRESTOREFRAME(SDVa
   SDLoc dl(Op);
   SDValue Chain = Op.getOperand(0);
 
+  assert(Subtarget->getFrameLowering()->hasFP(MF) &&
+         "using llvm.x86.seh.restoreframe requires a frame pointer");
+
   const TargetLowering &TLI = DAG.getTargetLoweringInfo();
   MVT VT = TLI.getPointerTy();
 
@@ -15974,6 +15977,8 @@ static SDValue LowerSEHRESTOREFRAME(SDVa
   Chain = DAG.getCopyToReg(Chain, dl, SPReg, NewSP);
 
   // FIXME: Restore the base pointer in case of stack realignment!
+  if (RegInfo->needsStackRealignment(MF))
+    report_fatal_error("SEH with stack realignment not yet implemented");
 
   // Adjust EBP to point back to the original frame position.
   SDValue NewFP = recoverFramePointer(DAG, MF.getFunction(), IncomingEBP);