[PowerPC] XCOFF exception section support on the direct assembler path

This feature implements support for making entries in the exception section
on XCOFF on the direct assembly path using the ".except" pseudo-op. It also
provides functionality to lower entries (comprised of language and reason
codes) into the exception section through the use of annotation metadata
attached to llvm.ppc.trap/trapd/tw/tdw intrinsics. Integrated assembler
support will be provided in another review. https://reviews.llvm.org/D133030
needs to merge first for LIT tests

Reviewed By: shchenz, RKSimon

Differential Revision: https://reviews.llvm.org/D132146

1 files changed, 9 insertions, 0 deletions

diff --git a/llvm/lib/MC/MCStreamer.cpp b/llvm/lib/MC/MCStreamer.cpp
index e93787c..de303f5 100644
--- a/llvm/lib/MC/MCStreamer.cpp
+++ b/llvm/lib/MC/MCStreamer.cpp
@@ -1190,6 +1190,15 @@ void MCStreamer::emitXCOFFRefDirective(StringRef Name) {
   llvm_unreachable("emitXCOFFRefDirective is only supported on XCOFF targets");
 }
 
+void MCStreamer::emitXCOFFExceptDirective(const MCSymbol *Symbol,
+                                          MCSymbol *Trap, unsigned Lang,
+                                          unsigned Reason,
+                                          unsigned FunctionSize,
+                                          bool hasDebug) {
+  report_fatal_error("emitXCOFFExceptDirective is only supported on "
+                     "XCOFF targets");
+}
+
 void MCStreamer::emitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
 void MCStreamer::emitELFSymverDirective(const MCSymbol *OriginalSym,
                                         StringRef Name, bool KeepOriginalSym) {}