[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/CodeGen/AsmPrinter/DwarfDebug.h b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
index f0d50a4..ec5040f 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -682,10 +682,12 @@
/// Emit an entry for the debug loc section. This can be used to
/// handle an entry that's going to be emitted into the debug loc section.
void emitDebugLocEntry(ByteStreamer &Streamer,
- const DebugLocStream::Entry &Entry);
+ const DebugLocStream::Entry &Entry,
+ const DwarfCompileUnit *CU);
/// Emit the location for a debug loc entry, including the size header.
- void emitDebugLocEntryLocation(const DebugLocStream::Entry &Entry);
+ void emitDebugLocEntryLocation(const DebugLocStream::Entry &Entry,
+ const DwarfCompileUnit *CU);
/// Find the MDNode for the given reference.
template <typename T> T *resolve(TypedDINodeRef<T> Ref) const {