A fix for PR21176.

DW_OP_const <const> doesn't describe a constant value, but a value at a constant address.
The proper way to describe a constant value is DW_OP_constu <const>, DW_OP_stack_value.

Added DW_OP_stack_value to the stack.

-This line, and those below, will be ignored--

M    lib/CodeGen/AsmPrinter/DwarfDebug.cpp
A    test/DebugInfo/incorrect-variable-debugloc1.ll

llvm-svn: 223981

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 230ea465182..8897ad0ae6c 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1722,6 +1722,8 @@ void DwarfDebug::emitDebugLocValue(ByteStreamer &Streamer,
       Streamer.EmitInt8(dwarf::DW_OP_constu, "DW_OP_constu");
       Streamer.EmitULEB128(Value.getInt());
     }
+   if (getDwarfVersion() >= 4)
+      Streamer.EmitInt8(dwarf::DW_OP_stack_value, "DW_OP_stack_value");
   } else if (Value.isLocation()) {
     MachineLocation Loc = Value.getLoc();
     DIExpression Expr = Value.getExpression();