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authorStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
committerStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
commitc906108c21474dfb4ed285bcc0ac6fe02cd400cc (patch)
treea0015aa5cedc19ccbab307251353a41722a3ae13 /gdb/reply_mig_hack.awk
parentcd946cff9ede3f30935803403f06f6ed30cad136 (diff)
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Initial creation of sourceware repositorygdb-4_18-branchpoint
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+# 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; }