[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/AsmParser/LLParser.cpp b/llvm/lib/AsmParser/LLParser.cpp
index 5a875fe..71315f3 100644
--- a/llvm/lib/AsmParser/LLParser.cpp
+++ b/llvm/lib/AsmParser/LLParser.cpp
@@ -4838,6 +4838,15 @@
return TokError(Twine("invalid DWARF op '") + Lex.getStrVal() + "'");
}
+ if (Lex.getKind() == lltok::DwarfAttEncoding) {
+ if (unsigned Op = dwarf::getAttributeEncoding(Lex.getStrVal())) {
+ Lex.Lex();
+ Elements.push_back(Op);
+ continue;
+ }
+ return TokError(Twine("invalid DWARF attribute encoding '") + Lex.getStrVal() + "'");
+ }
+
if (Lex.getKind() != lltok::APSInt || Lex.getAPSIntVal().isSigned())
return TokError("expected unsigned integer");