Add support for .cfi_signal_frame. Fixes pr11762.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148733 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index baf8b30..64d0dd8 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -306,6 +306,8 @@
       &GenericAsmParser::ParseDirectiveCFIRestore>(".cfi_restore");
     AddDirectiveHandler<
       &GenericAsmParser::ParseDirectiveCFIEscape>(".cfi_escape");
+    AddDirectiveHandler<
+      &GenericAsmParser::ParseDirectiveCFISignalFrame>(".cfi_signal_frame");
 
     // Macro directives.
     AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacrosOnOff>(
@@ -341,6 +343,7 @@
   bool ParseDirectiveCFISameValue(StringRef, SMLoc DirectiveLoc);
   bool ParseDirectiveCFIRestore(StringRef, SMLoc DirectiveLoc);
   bool ParseDirectiveCFIEscape(StringRef, SMLoc DirectiveLoc);
+  bool ParseDirectiveCFISignalFrame(StringRef, SMLoc DirectiveLoc);
 
   bool ParseDirectiveMacrosOnOff(StringRef, SMLoc DirectiveLoc);
   bool ParseDirectiveMacro(StringRef, SMLoc DirectiveLoc);
@@ -2855,6 +2858,19 @@
   return false;
 }
 
+/// ParseDirectiveCFISignalFrame
+/// ::= .cfi_signal_frame
+bool GenericAsmParser::ParseDirectiveCFISignalFrame(StringRef Directive,
+                                                    SMLoc DirectiveLoc) {
+  if (getLexer().isNot(AsmToken::EndOfStatement))
+    return Error(getLexer().getLoc(),
+                 "unexpected token in '" + Directive + "' directive");
+
+  getStreamer().EmitCFISignalFrame();
+
+  return false;
+}
+
 /// ParseDirectiveMacrosOnOff
 /// ::= .macros_on
 /// ::= .macros_off