Define a new intrinsic, @llvm.debugger. It will be similar to __builtin_trap(),

but it generates int3 on x86 instead of ud2.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156593 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 8 insertions, 0 deletions

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index f1e879be95..c73ba7bc22 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -5087,6 +5087,10 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
     DAG.setRoot(Result.second);
     return 0;
   }
+  case Intrinsic::debugger: {
+    DAG.setRoot(DAG.getNode(ISD::DEBUGGER, dl,MVT::Other, getRoot()));
+    return 0;
+  }
   case Intrinsic::uadd_with_overflow:
   case Intrinsic::sadd_with_overflow:
   case Intrinsic::usub_with_overflow:
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
index f981afb437..7b633eff54 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
@@ -265,6 +265,7 @@ std::string SDNode::getOperationName(const SelectionDAG *G) const {
   case ISD::STACKSAVE:                  return "stacksave";
   case ISD::STACKRESTORE:               return "stackrestore";
   case ISD::TRAP:                       return "trap";
+  case ISD::DEBUGGER:                   return "debugger";
 
   // Bit manipulation
   case ISD::BSWAP:                      return "bswap";
diff --git a/lib/Target/X86/X86InstrSystem.td b/lib/Target/X86/X86InstrSystem.td
index f1ca114c4c..dd1b499ddd 100644
--- a/lib/Target/X86/X86InstrSystem.td
+++ b/lib/Target/X86/X86InstrSystem.td
@@ -36,6 +36,9 @@ let Uses = [EFLAGS] in
 def INT3 : I<0xcc, RawFrm, (outs), (ins), "int3",
               [(int_x86_int (i8 3))], IIC_INT3>;
 
+def : Pat<(debugger),
+          (INT3)>;
+
 // The long form of "int $3" turns into int3 as a size optimization.
 // FIXME: This doesn't work because InstAlias can't match immediate constants.
 //def : InstAlias<"int\t$3", (INT3)>;