Add support for GCC compatible builtin setjmp and longjmp intrinsics. This is

a supporting preliminary patch for GCC-compatible SjLJ exception handling. Note that these intrinsics are not designed to be invoked directly by the user, but
rather used by the front-end as target hooks for exception handling.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71610 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 17 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/MachineFunction.h b/include/llvm/CodeGen/MachineFunction.h
index a110e5846a..469ae026f0 100644
--- a/include/llvm/CodeGen/MachineFunction.h
+++ b/include/llvm/CodeGen/MachineFunction.h
@@ -70,6 +70,10 @@ class MachineFunction : private Annotation {
   const Function *Fn;
   const TargetMachine &Target;
 
+  // HasBuiltinSetjmp - true if the function uses builtin_setjmp. Used to
+  // adjust callee-saved register tracking.
+  bool HasBuiltinSetjmp;
+
   // RegInfo - Information about each register in use in the function.
   MachineRegisterInfo *RegInfo;
 
@@ -123,6 +127,14 @@ public:
   ///
   const TargetMachine &getTarget() const { return Target; }
 
+  /// doesHaveBuiltinSetjmp - Return whether this function uses builtin_setjmp
+  ///
+  bool doesHaveBuiltinSetjmp() const { return HasBuiltinSetjmp; }
+
+  /// setHasBuiltinSetjmp - Mark whether this function uses builtin_setjmp
+  ///
+  void setHasBuiltinSetjmp (bool flag) { HasBuiltinSetjmp = flag; }
+
   /// getRegInfo - Return information about the registers currently in use.
   ///
   MachineRegisterInfo &getRegInfo() { return *RegInfo; }
diff --git a/include/llvm/Intrinsics.td b/include/llvm/Intrinsics.td
index 6e4ce82c4c..7c869f0aa3 100644
--- a/include/llvm/Intrinsics.td
+++ b/include/llvm/Intrinsics.td
@@ -299,6 +299,11 @@ def int_eh_unwind_init: Intrinsic<[llvm_void_ty]>,
 
 def int_eh_dwarf_cfa  : Intrinsic<[llvm_ptr_ty], [llvm_i32_ty]>;
 
+let Properties = [IntrNoMem] in {
+def int_builtinsetjmp  : Intrinsic<[llvm_i32_ty],  [llvm_ptr_ty]>;
+def int_builtinlongjmp : Intrinsic<[llvm_void_ty], [llvm_ptr_ty, llvm_i32_ty]>;
+}
+
 //===---------------- Generic Variable Attribute Intrinsics----------------===//
 //
 def int_var_annotation : Intrinsic<[llvm_void_ty],