libiberty: Add support for demangling local D template declarations

The D language now allows multiple different template declarations in
the same function that have the same mangled name.  To make the mangled
names unique, a fake parent in the form `__Sddd' is added to the symbol.
This information is not important for the user, so the demangler now
handles and ignores it.

libiberty/ChangeLog:

	* d-demangle.c (dlang_identifier): Skip over fake parent manglings.
	* testsuite/d-demangle-expected: Add tests.

1 files changed, 19 insertions, 0 deletions

diff --git a/libiberty/d-demangle.c b/libiberty/d-demangle.c
index d74cf47b1a9..a2152cc6551 100644
--- a/libiberty/d-demangle.c
+++ b/libiberty/d-demangle.c
@@ -1044,6 +1044,25 @@ dlang_identifier (string *decl, const char *mangled, struct dlang_info *info)
       && (mangled[2] == 'T' || mangled[2] == 'U'))
     return dlang_parse_template (decl, mangled, info, len);
 
+  /* There can be multiple different declarations in the same function that have
+     the same mangled name.  To make the mangled names unique, a fake parent in
+     the form `__Sddd' is added to the symbol.  */
+  if (len >= 4 && mangled[0] == '_' && mangled[1] == '_' && mangled[2] == 'S')
+    {
+      const char *numptr = mangled + 3;
+      while (numptr < (mangled + len) && ISDIGIT (*numptr))
+	numptr++;
+
+      if (mangled + len == numptr)
+	{
+	  /* Skip over the fake parent.  */
+	  mangled += len;
+	  return dlang_identifier (decl, mangled, info);
+	}
+
+      /* else demangle it as a plain identifier.  */
+    }
+
   return dlang_lname (decl, mangled, len);
 }