[DebugInfo] Introduce DW_OP_LLVM_convert
Introduce a DW_OP_LLVM_convert Dwarf expression pseudo op that allows
for a convenient way to perform type conversions on the Dwarf expression
stack. As an additional bonus it paves the way for using other Dwarf
v5 ops that need to reference a base_type.
The new DW_OP_LLVM_convert is used from lib/Transforms/Utils/Local.cpp
to perform sext/zext on debug values but mainly the patch is about
preparing terrain for adding other Dwarf v5 ops that need to reference a
base_type.
For Dwarf v5 the op maps to DW_OP_convert and for earlier versions a
complex shift & mask pattern is generated to emulate sext/zext.
This is a recommit of r356442 with trivial fixes for the failing tests.
Differential Revision: https://reviews.llvm.org/D56587
llvm-svn: 356451
diff --git a/llvm/lib/BinaryFormat/Dwarf.cpp b/llvm/lib/BinaryFormat/Dwarf.cpp
index 73f04a3..b6d4d5b 100644
--- a/llvm/lib/BinaryFormat/Dwarf.cpp
+++ b/llvm/lib/BinaryFormat/Dwarf.cpp
@@ -143,6 +143,8 @@
case DW_OP_##NAME: \
return "DW_OP_" #NAME;
#include "llvm/BinaryFormat/Dwarf.def"
+ case DW_OP_LLVM_convert:
+ return "DW_OP_LLVM_convert";
case DW_OP_LLVM_fragment:
return "DW_OP_LLVM_fragment";
}
@@ -153,6 +155,7 @@
#define HANDLE_DW_OP(ID, NAME, VERSION, VENDOR) \
.Case("DW_OP_" #NAME, DW_OP_##NAME)
#include "llvm/BinaryFormat/Dwarf.def"
+ .Case("DW_OP_LLVM_convert", DW_OP_LLVM_convert)
.Case("DW_OP_LLVM_fragment", DW_OP_LLVM_fragment)
.Default(0);
}