Add a new flag for targets where setjmp/longjmp saves/restores the signal mask,

and _setjmp/_longjmp should be used instead (for llvm.setjmp/llvm.longjmp).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23479 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Target/TargetLowering.h

@@ -219,6 +219,12 @@ public:
   bool allowsUnalignedMemoryAccesses() const 
     { return allowUnalignedMemoryAccesses; }
   
+  /// usesUnderscoreSetJmpLongJmp - Determine if we should use _setjmp or setjmp
+  /// to implement llvm.setjmp.
+  bool usesUnderscoreSetJmpLongJmp() const {
+    return UseUnderscoreSetJmpLongJmp;
+  }
+
   //===--------------------------------------------------------------------===//
   // TargetLowering Configuration Methods - These methods should be invoked by
   // the derived class constructor to configure this object for the target.
@@ -244,6 +250,13 @@ protected:
     ShiftAmtHandling = OORSA;
   }
 
+  /// setUseUnderscoreSetJmpLongJmp - Indicate whether this target prefers to
+  /// use _setjmp and _longjmp to or implement llvm.setjmp/llvm.longjmp or
+  /// the non _ versions.  Defaults to false.
+  void setUseUnderscoreSetJmpLongJmp(bool Val) {
+    UseUnderscoreSetJmpLongJmp = Val;
+  }
+  
   /// setSetCCIxExpensive - This is a short term hack for targets that codegen
   /// setcc as a conditional branch.  This encourages the code generator to fold
   /// setcc operations into other operations if possible.
@@ -380,6 +393,10 @@ private:
   /// the result of a setcc comparison operation.
   SetCCResultValue SetCCResultContents;
   
+  /// UseUnderscoreSetJmpLongJmp - This target prefers to use _setjmp and
+  /// _longjmp to implement llvm.setjmp/llvm.longjmp.  Defaults to false.
+  bool UseUnderscoreSetJmpLongJmp;
+
   /// RegClassForVT - This indicates the default register class to use for
   /// each ValueType the target supports natively.
   TargetRegisterClass *RegClassForVT[MVT::LAST_VALUETYPE];