Add __builtin_setjmp/_longjmp supprt in X86 backend

- Besides used in SjLj exception handling, __builtin_setjmp/__longjmp is also
  used as a light-weight replacement of setjmp/longjmp which are used to
  implementation continuation, user-level threading, and etc. The support added
  in this patch ONLY addresses this usage and is NOT intended to support SjLj
  exception handling as zero-cost DWARF exception handling is used by default
  in X86.

llvm-svn: 165989

1 files changed, 14 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86ISelLowering.h b/llvm/lib/Target/X86/X86ISelLowering.h
index b654d5f2756..40e966ad676 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.h
+++ b/llvm/lib/Target/X86/X86ISelLowering.h
@@ -217,6 +217,12 @@ namespace llvm {
       // EH_RETURN - Exception Handling helpers.
       EH_RETURN,
 
+      // EH_SJLJ_SETJMP - SjLj exception handling setjmp.
+      EH_SJLJ_SETJMP,
+
+      // EH_SJLJ_LONGJMP - SjLj exception handling longjmp.
+      EH_SJLJ_LONGJMP,
+
       /// TC_RETURN - Tail call return.
       ///   operand #0 chain
       ///   operand #1 callee (register or absolute)
@@ -810,6 +816,8 @@ namespace llvm {
     SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerFRAME_TO_ARGS_OFFSET(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerEH_RETURN(SDValue Op, SelectionDAG &DAG) const;
+    SDValue lowerEH_SJLJ_SETJMP(SDValue Op, SelectionDAG &DAG) const;
+    SDValue lowerEH_SJLJ_LONGJMP(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerINIT_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerFLT_ROUNDS_(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerShift(SDValue Op, SelectionDAG &DAG) const;
@@ -906,6 +914,12 @@ namespace llvm {
     MachineBasicBlock *emitLoweredTLSAddr(MachineInstr *MI,
                                           MachineBasicBlock *BB) const;
 
+    MachineBasicBlock *emitEHSjLjSetJmp(MachineInstr *MI,
+                                        MachineBasicBlock *MBB) const;
+
+    MachineBasicBlock *emitEHSjLjLongJmp(MachineInstr *MI,
+                                         MachineBasicBlock *MBB) const;
+
     /// Emit nodes that will be selected as "test Op0,Op0", or something
     /// equivalent, for use with the given x86 condition code.
     SDValue EmitTest(SDValue Op0, unsigned X86CC, SelectionDAG &DAG) const;