1# Reply server mig-output massager 2# 3# Copyright 1995, 1996, 1999 Free Software Foundation, Inc. 4# 5# Written by Miles Bader <miles@gnu.ai.mit.edu> 6# 7# This program is free software; you can redistribute it and/or 8# modify it under the terms of the GNU General Public License as 9# published by the Free Software Foundation; either version 2, or (at 10# your option) any later version. 11# 12# This program is distributed in the hope that it will be useful, but 13# WITHOUT ANY WARRANTY; without even the implied warranty of 14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15# General Public License for more details. 16# 17# You should have received a copy of the GNU General Public License 18# along with this program; if not, write to the Free Software 19# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 20# 21# This awk script hacks the output of mig-generated reply server code 22# so that it allows replies with just the error-code in them (as this is 23# how mig returns errors). 24# 25# It is highly, highly, dependent on the exact format of mig output. Ick. 26# 27 28BEGIN { parse_phase = 0; } 29 30/^}/ { parse_phase = 0; } 31 32parse_phase == 0 && /^mig_internal void _X[a-zA-Z0-9_]*_reply/ { 33 # The start of a mig server routine. Reset everything. Note that we only 34 # mess with rpcs that have the suffix `_reply'. 35 num_args = 0; 36 num_checks = 0; 37 parse_phase = 1; 38 print; next; 39} 40 41parse_phase == 1 && /^[\t ]*typedef struct/ { 42 # The first structure in the server routine should describe the arguments 43 parse_phase = 2; 44 print; next; 45} 46 47parse_phase == 2 { 48 # The message header field in the args structure, which skip. 49 parse_phase = 3; 50 print; next; 51} 52 53parse_phase == 3 && /}/ { 54 # The args structure is over. 55 if (num_args > 1) 56 parse_phase = 5; 57 else 58 # There's no extra args that could screw up the normal mechanism for 59 # error returns, so we don't have to insert any new code. 60 parse_phase = 0; 61 print; next; 62} 63 64parse_phase == 3 { 65 # The type field for an argument. 66 arg_type_code_name[num_args] = $2; 67 sub (/;$/, "", arg_type_code_name[num_args]) # Get rid of the semi-colon 68 parse_phase = 4; 69 print; next; 70} 71 72parse_phase == 4 { 73 # The value field for an argument. 74 arg_name[num_args] = $2; 75 sub (/;$/, "", arg_name[num_args]) # Get rid of the semi-colon 76 arg_type[num_args] = $1; 77 num_args++; 78 parse_phase = 3; 79 print; next; 80} 81 82parse_phase == 5 && /^[ \t]*static const mach_msg_type_t/ { 83 # The type check structure for an argument. 84 arg_check_name[num_checks] = $4; 85 num_checks++; 86 print; next; 87} 88 89parse_phase == 5 && /^[ \t]*mig_external kern_return_t/ { 90 # The declaration of the user server function for this rpc. 91 user_function_name = $3; 92 print; next; 93} 94 95parse_phase == 5 && /^#if[ \t]TypeCheck/ { 96 # The first args type checking statement; we need to insert our chunk of 97 # code that bypasses all the type checks if this is an error return, after 98 # which we're done until we get to the next function. Handily, the size 99 # of mig's Reply structure is also the size of the alternate Request 100 # structure that we want to check for. 101 print "\tif (In0P->Head.msgh_size == sizeof (Reply)"; 102 print "\t && ! (In0P->Head.msgh_bits & MACH_MSGH_BITS_COMPLEX)"; 103 print "\t && *(int *)&In0P->" arg_type_code_name[0] " == *(int *)&" arg_check_name[0]; 104 print "\t && In0P->" arg_name[0] " != 0)"; 105 print "\t /* Error return, only the error code argument is passed. */"; 106 print "\t {"; 107 # Force the function into a type that only takes the first two args, via 108 # the temp variable SFUN (is there another way to correctly do this cast?). 109 # This is possibly bogus, but easier than supplying bogus values for all 110 # the other args (we can't just pass 0 for them, as they might not be scalar). 111 printf ("\t kern_return_t (*sfun)(mach_port_t"); 112 for (i = 0; i < num_args; i++) 113 printf (", %s", arg_type[i]); 114 printf (") = %s;\n", user_function_name); 115 print "\t OutP->RetCode = (*(kern_return_t (*)(mach_port_t, kern_return_t))sfun) (In0P->Head.msgh_request_port, In0P->" arg_name[0] ");"; 116 print "\t return;"; 117 print "\t }"; 118 print ""; 119 parse_phase = 0; 120 print; next; 121} 122 123{ print; } 124