[AArch64] - Return address signing dwarf support

- Reapply changes intially introduced in r343089
- The archtecture info is no longer loaded whenever a DWARFContext is created
- The runtimes libraries (santiziers) make use of the dwarf context classes but
  do not intialise the target info
- The architecture of the object can be obtained without loading the target info
- Adding a method to the dwarf context to get this information and multiplex the
  string printing later on

Differential Revision: https://reviews.llvm.org/D55774

llvm-svn: 349472

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/MC/MCAsmStreamer.cpp b/llvm/lib/MC/MCAsmStreamer.cpp
index 0daec983dfd..fd10c6901b7 100644
--- a/llvm/lib/MC/MCAsmStreamer.cpp
+++ b/llvm/lib/MC/MCAsmStreamer.cpp
@@ -285,6 +285,7 @@ public:
   void EmitCFIUndefined(int64_t Register) override;
   void EmitCFIRegister(int64_t Register1, int64_t Register2) override;
   void EmitCFIWindowSave() override;
+  void EmitCFINegateRAState() override;
   void EmitCFIReturnColumn(int64_t Register) override;
 
   void EmitWinCFIStartProc(const MCSymbol *Symbol, SMLoc Loc) override;
@@ -1586,6 +1587,12 @@ void MCAsmStreamer::EmitCFIWindowSave() {
   EmitEOL();
 }
 
+void MCAsmStreamer::EmitCFINegateRAState() {
+  MCStreamer::EmitCFINegateRAState();
+  OS << "\t.cfi_negate_ra_state";
+  EmitEOL();
+}
+
 void MCAsmStreamer::EmitCFIReturnColumn(int64_t Register) {
   MCStreamer::EmitCFIReturnColumn(Register);
   OS << "\t.cfi_return_column " << Register;