From 5cde219fb107effdb405059ab5e8d0cb742209d9 Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Thu, 27 May 2010 18:23:48 +0000
Subject: [PATCH] add ISD::STACKADDR to get the current stack pointer. Will be
 used by sjlj EH to update the jmpbuf in the presence of VLAs.

llvm-svn: 104862
---
 llvm/include/llvm/CodeGen/ISDOpcodes.h  | 3 +++
 llvm/lib/Target/ARM/ARMISelLowering.cpp | 8 ++++++++
 llvm/lib/Target/ARM/ARMISelLowering.h   | 1 +
 3 files changed, 12 insertions(+)

diff --git a/llvm/include/llvm/CodeGen/ISDOpcodes.h b/llvm/include/llvm/CodeGen/ISDOpcodes.h
index a5e9dd5fe84a..fdb9bfd6554a 100644
--- a/llvm/include/llvm/CodeGen/ISDOpcodes.h
+++ b/llvm/include/llvm/CodeGen/ISDOpcodes.h
@@ -72,6 +72,9 @@ namespace ISD {
     // parent's frame or return address, and so on.
     FRAMEADDR, RETURNADDR,
 
+    // STACKADDR - The current stack pointer address.
+    STACKADDR,
+
     // FRAME_TO_ARGS_OFFSET - This node represents offset from frame pointer to
     // first (possible) on-stack argument. This is needed for correct stack
     // adjustment during unwind.
diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp
index b8126a3c5d18..f6037c0c8392 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -2183,6 +2183,13 @@ SDValue ARMTargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const {
   return FrameAddr;
 }
 
+SDValue ARMTargetLowering::LowerSTACKADDR(SDValue Op, SelectionDAG &DAG) const {
+  EVT VT = Op.getValueType();
+  DebugLoc dl = Op.getDebugLoc();  // FIXME probably not meaningful
+  SDValue StackAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, ARM::SP, VT);
+  return StackAddr;
+}
+
 /// ExpandBIT_CONVERT - If the target supports VFP, this function is called to
 /// expand a bit convert where either the source or destination type is i64 to
 /// use a VMOVDRR or VMOVRRD node.  This should not be done when the non-i64
@@ -3187,6 +3194,7 @@ SDValue ARMTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
   case ISD::FCOPYSIGN:     return LowerFCOPYSIGN(Op, DAG);
   case ISD::RETURNADDR:    return LowerRETURNADDR(Op, DAG);
   case ISD::FRAMEADDR:     return LowerFRAMEADDR(Op, DAG);
+  case ISD::STACKADDR:     return LowerSTACKADDR(Op, DAG);
   case ISD::GLOBAL_OFFSET_TABLE: return LowerGLOBAL_OFFSET_TABLE(Op, DAG);
   case ISD::EH_SJLJ_SETJMP: return LowerEH_SJLJ_SETJMP(Op, DAG);
   case ISD::EH_SJLJ_LONGJMP: return LowerEH_SJLJ_LONGJMP(Op, DAG);
diff --git a/llvm/lib/Target/ARM/ARMISelLowering.h b/llvm/lib/Target/ARM/ARMISelLowering.h
index 9c7517c88195..29b3be13da03 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.h
+++ b/llvm/lib/Target/ARM/ARMISelLowering.h
@@ -305,6 +305,7 @@ namespace llvm {
     SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
+    SDValue LowerSTACKADDR(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerShiftRightParts(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerShiftLeftParts(SDValue Op, SelectionDAG &DAG) const;