1 files changed, 123 insertions, 0 deletions
diff --git a/gdb/reply_mig_hack.awk b/gdb/reply_mig_hack.awk
new file mode 100644
index 0000000..310a40c
--- /dev/null
+++ b/gdb/reply_mig_hack.awk
@@ -0,0 +1,123 @@
+# Reply server mig-output massager
+#
+#   Copyright (C) 1995 Free Software Foundation, Inc.
+#
+#   Written by Miles Bader <miles@gnu.ai.mit.edu>
+#
+#   This program is free software; you can redistribute it and/or
+#   modify it under the terms of the GNU General Public License as
+#   published by the Free Software Foundation; either version 2, or (at
+#   your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+#   General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program; if not, write to the Free Software
+#   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+#
+# This awk script hacks the output of mig-generated reply server code
+# so that it allows replies with just the error-code in them (as this is
+# how mig returns errors).
+#
+# It is highly, highly, dependent on the exact format of mig output.  Ick.
+#
+
+BEGIN { parse_phase = 0; }
+
+/^}/ { parse_phase = 0; }
+
+parse_phase == 0 && /^mig_internal void _X[a-zA-Z0-9_]*_reply/ {
+  # The start of a mig server routine.  Reset everything.  Note that we only
+  # mess with rpcs that have the suffix `_reply'.
+  num_args = 0;
+  num_checks = 0;
+  parse_phase = 1;
+  print; next;
+}
+
+parse_phase == 1 && /^[\t ]*typedef struct/ {
+  # The first structure in the server routine should describe the arguments
+  parse_phase = 2;
+  print; next;
+}
+
+parse_phase == 2 {
+  # The message header field in the args structure, which skip.
+  parse_phase = 3;
+  print; next;
+}
+
+parse_phase == 3 && /}/ {
+  # The args structure is over.
+  if (num_args > 1)
+    parse_phase = 5;
+  else
+    # There's no extra args that could screw up the normal mechanism for
+    # error returns, so we don't have to insert any new code.
+    parse_phase = 0;
+  print; next;
+}
+
+parse_phase == 3 {
+  # The type field for an argument.
+  arg_type_code_name[num_args] = $2;
+  sub (/;$/, "", arg_type_code_name[num_args]) # Get rid of the semi-colon
+  parse_phase = 4;
+  print; next;
+}
+
+parse_phase == 4 {
+  # The value field for an argument.
+  arg_name[num_args] = $2;
+  sub (/;$/, "", arg_name[num_args]) # Get rid of the semi-colon
+  arg_type[num_args] = $1;
+  num_args++;
+  parse_phase = 3;
+  print; next;
+}
+
+parse_phase == 5 && /^[ \t]*static const mach_msg_type_t/ {
+  # The type check structure for an argument.
+  arg_check_name[num_checks] = $4;
+  num_checks++;
+  print; next;
+}
+
+parse_phase == 5 && /^[ \t]*mig_external kern_return_t/ {
+  # The declaration of the user server function for this rpc.
+  user_function_name = $3;
+  print; next;
+}
+
+parse_phase == 5 && /^#if[ \t]TypeCheck/ {
+  # The first args type checking statement; we need to insert our chunk of
+  # code that bypasses all the type checks if this is an error return, after
+  # which we're done until we get to the next function.  Handily, the size
+  # of mig's Reply structure is also the size of the alternate Request 
+  # structure that we want to check for.
+  print "\tif (In0P->Head.msgh_size == sizeof (Reply)";
+  print "\t    && ! (In0P->Head.msgh_bits & MACH_MSGH_BITS_COMPLEX)";
+  print "\t    && *(int *)&In0P->" arg_type_code_name[0] " == *(int *)&" arg_check_name[0];
+  print "\t    && In0P->" arg_name[0] " != 0)";
+  print "\t  /* Error return, only the error code argument is passed.  */";
+  print "\t  {";
+  # Force the function into a type that only takes the first two args, via
+  # the temp variable SFUN (is there another way to correctly do this cast?).
+  # This is possibly bogus, but easier than supplying bogus values for all
+  # the other args (we can't just pass 0 for them, as they might not be scalar).
+  printf ("\t    kern_return_t (*sfun)(mach_port_t");
+  for (i = 0; i < num_args; i++)
+    printf (", %s", arg_type[i]);
+  printf (") = %s;\n", user_function_name);
+  print "\t    OutP->RetCode = (*(kern_return_t (*)(mach_port_t, kern_return_t))sfun) (In0P->Head.msgh_request_port, In0P->" arg_name[0] ");";
+  print "\t    return;";
+  print "\t  }";
+  print "";
+  parse_phase = 0;
+  print; next;
+}
+
+{ print; }