commit 0e0da734bbdfa1d3f55cd04db31d83b97e4556f7
author Jim Grosbach <grosbach@apple.com> Tue May 12 23:59:14 2009 +0000
committer Jim Grosbach <grosbach@apple.com> Tue May 12 23:59:14 2009 +0000
tree aa04b7f115b464f914893e1e637c808794af646e
parent 9d3094b38e51c85e93fc5a9c8ab23c95b73f78d4

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

lib/CodeGen/MachineFunction.cpp

diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp
index 5135308..cb19bec 100644
--- a/lib/CodeGen/MachineFunction.cpp
+++ b/lib/CodeGen/MachineFunction.cpp
@@ -121,6 +121,7 @@
                   MachineRegisterInfo(*TM.getRegisterInfo());
   else
     RegInfo = 0;
+  HasBuiltinSetjmp = false;
   MFInfo = 0;
   FrameInfo = new (Allocator.Allocate<MachineFrameInfo>())
                   MachineFrameInfo(*TM.getFrameInfo());

lib/CodeGen/PrologEpilogInserter.cpp

diff --git a/lib/CodeGen/PrologEpilogInserter.cpp b/lib/CodeGen/PrologEpilogInserter.cpp
index 6f95d1c..d9665cc 100644
--- a/lib/CodeGen/PrologEpilogInserter.cpp
+++ b/lib/CodeGen/PrologEpilogInserter.cpp
@@ -180,7 +180,7 @@
   std::vector<CalleeSavedInfo> CSI;
   for (unsigned i = 0; CSRegs[i]; ++i) {
     unsigned Reg = CSRegs[i];
-    if (Fn.getRegInfo().isPhysRegUsed(Reg)) {
+    if (Fn.getRegInfo().isPhysRegUsed(Reg) || Fn.doesHaveBuiltinSetjmp()) {
         // If the reg is modified, save it!
       CSI.push_back(CalleeSavedInfo(Reg, CSRegClasses[i]));
     } else {

lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
index b340d0c..cecd529 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
@@ -3849,6 +3849,12 @@
   case Intrinsic::longjmp:
     return "_longjmp"+!TLI.usesUnderscoreLongJmp();
     break;
+  case Intrinsic::builtinsetjmp:
+    // Mark this function has using builtin_setjmp so context gets preserved
+    DAG.getMachineFunction().setHasBuiltinSetjmp(true);
+    // Turn it into a target intrinsic node for the codegen
+    visitTargetIntrinsic(I, Intrinsic);
+    return 0;
   case Intrinsic::memcpy: {
     SDValue Op1 = getValue(I.getOperand(1));
     SDValue Op2 = getValue(I.getOperand(2));