src/mapi/glapi/gen/gl_marshal.py

   1
   2 # Copyright (C) 2012 Intel Corporation
   3 #
   4 # Permission is hereby granted, free of charge, to any person obtaining a
   5 # copy of this software and associated documentation files (the "Software"),
   6 # to deal in the Software without restriction, including without limitation
   7 # the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 # and/or sell copies of the Software, and to permit persons to whom the
   9 # Software is furnished to do so, subject to the following conditions:
  10 #
  11 # The above copyright notice and this permission notice (including the next
  12 # paragraph) shall be included in all copies or substantial portions of the
  13 # Software.
  14 #
  15 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18 # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21 # IN THE SOFTWARE.
  22
  23 from __future__ import print_function
  24
  25 import contextlib
  26 import getopt
  27 import gl_XML
  28 import license
  29 import marshal_XML
  30 import sys
  31
  32 header = """
  33 #include "api_exec.h"
  34 #include "context.h"
  35 #include "dispatch.h"
  36 #include "glthread.h"
  37 #include "marshal.h"
  38 """
  39
  40
  41 current_indent = 0
  42
  43
  44 def out(str):
  45     if str:
  46         print(' '*current_indent + str)
  47     else:
  48         print('')
  49
  50
  51 @contextlib.contextmanager
  52 def indent(delta = 3):
  53     global current_indent
  54     current_indent += delta
  55     yield
  56     current_indent -= delta
  57
  58
  59 class PrintCode(gl_XML.gl_print_base):
  60     def __init__(self):
  61         super(PrintCode, self).__init__()
  62
  63         self.name = 'gl_marshal.py'
  64         self.license = license.bsd_license_template % (
  65             'Copyright (C) 2012 Intel Corporation', 'INTEL CORPORATION')
  66
  67     def printRealHeader(self):
  68         print(header)
  69         print('static inline int safe_mul(int a, int b)')
  70         print('{')
  71         print('    if (a < 0 || b < 0) return -1;')
  72         print('    if (a == 0 || b == 0) return 0;')
  73         print('    if (a > INT_MAX / b) return -1;')
  74         print('    return a * b;')
  75         print('}')
  76         print()
  77
  78     def printRealFooter(self):
  79         pass
  80
  81     def print_sync_call(self, func, unmarshal = 0):
  82         call = 'CALL_{0}(ctx->CurrentServerDispatch, ({1}))'.format(
  83             func.name, func.get_called_parameter_string())
  84         if func.return_type == 'void':
  85             out('{0};'.format(call))
  86             if func.marshal_call_after and not unmarshal:
  87                 out(func.marshal_call_after);
  88         else:
  89             out('return {0};'.format(call))
  90             assert not func.marshal_call_after
  91
  92     def print_sync_dispatch(self, func):
  93         self.print_sync_call(func)
  94
  95     def print_sync_body(self, func):
  96         out('/* {0}: marshalled synchronously */'.format(func.name))
  97         out('static {0} GLAPIENTRY'.format(func.return_type))
  98         out('_mesa_marshal_{0}({1})'.format(func.name, func.get_parameter_string()))
  99         out('{')
 100         with indent():
 101             out('GET_CURRENT_CONTEXT(ctx);')
 102             out('_mesa_glthread_finish_before(ctx, "{0}");'.format(func.name))
 103             self.print_sync_call(func)
 104         out('}')
 105         out('')
 106         out('')
 107
 108     def print_async_dispatch(self, func):
 109         out('cmd = _mesa_glthread_allocate_command(ctx, '
 110             'DISPATCH_CMD_{0}, cmd_size);'.format(func.name))
 111         for p in func.fixed_params:
 112             if p.count:
 113                 out('memcpy(cmd->{0}, {0}, {1});'.format(
 114                         p.name, p.size_string()))
 115             else:
 116                 out('cmd->{0} = {0};'.format(p.name))
 117         if func.variable_params:
 118             out('char *variable_data = (char *) (cmd + 1);')
 119             i = 1
 120             for p in func.variable_params:
 121                 if p.img_null_flag:
 122                     out('cmd->{0}_null = !{0};'.format(p.name))
 123                     out('if (!cmd->{0}_null) {{'.format(p.name))
 124                     with indent():
 125                         out(('memcpy(variable_data, {0}, {0}_size);').format(p.name))
 126                         if i < len(func.variable_params):
 127                             out('variable_data += {0}_size;'.format(p.name))
 128                     out('}')
 129                 else:
 130                     out(('memcpy(variable_data, {0}, {0}_size);').format(p.name))
 131                     if i < len(func.variable_params):
 132                         out('variable_data += {0}_size;'.format(p.name))
 133                 i += 1
 134
 135         if not func.fixed_params and not func.variable_params:
 136             out('(void) cmd;')
 137
 138         if func.marshal_call_after:
 139             out(func.marshal_call_after);
 140
 141         # Uncomment this if you want to call _mesa_glthread_finish for debugging
 142         #out('_mesa_glthread_finish(ctx);')
 143
 144     def print_async_struct(self, func):
 145         out('struct marshal_cmd_{0}'.format(func.name))
 146         out('{')
 147         with indent():
 148             out('struct marshal_cmd_base cmd_base;')
 149             for p in func.fixed_params:
 150                 if p.count:
 151                     out('{0} {1}[{2}];'.format(
 152                             p.get_base_type_string(), p.name, p.count))
 153                 else:
 154                     out('{0} {1};'.format(p.type_string(), p.name))
 155
 156             for p in func.variable_params:
 157                 if p.img_null_flag:
 158                     out('bool {0}_null; /* If set, no data follows '
 159                         'for "{0}" */'.format(p.name))
 160
 161             for p in func.variable_params:
 162                 if p.count_scale != 1:
 163                     out(('/* Next {0} bytes are '
 164                          '{1} {2}[{3}][{4}] */').format(
 165                             p.size_string(marshal = 1), p.get_base_type_string(),
 166                             p.name, p.counter, p.count_scale))
 167                 else:
 168                     out(('/* Next {0} bytes are '
 169                          '{1} {2}[{3}] */').format(
 170                             p.size_string(marshal = 1), p.get_base_type_string(),
 171                             p.name, p.counter))
 172         out('};')
 173
 174     def print_async_unmarshal(self, func):
 175         out('static inline void')
 176         out(('_mesa_unmarshal_{0}(struct gl_context *ctx, '
 177              'const struct marshal_cmd_{0} *cmd)').format(func.name))
 178         out('{')
 179         with indent():
 180             for p in func.fixed_params:
 181                 if p.count:
 182                     p_decl = '{0} * {1} = cmd->{1};'.format(
 183                             p.get_base_type_string(), p.name)
 184                 else:
 185                     p_decl = '{0} {1} = cmd->{1};'.format(
 186                             p.type_string(), p.name)
 187
 188                 if not p_decl.startswith('const '):
 189                     # Declare all local function variables as const, even if
 190                     # the original parameter is not const.
 191                     p_decl = 'const ' + p_decl
 192
 193                 out(p_decl)
 194
 195             if func.variable_params:
 196                 for p in func.variable_params:
 197                     out('{0} * {1};'.format(
 198                             p.get_base_type_string(), p.name))
 199                 out('const char *variable_data = (const char *) (cmd + 1);')
 200                 i = 1
 201                 for p in func.variable_params:
 202                     out('{0} = ({1} *) variable_data;'.format(
 203                             p.name, p.get_base_type_string()))
 204
 205                     if p.img_null_flag:
 206                         out('if (cmd->{0}_null)'.format(p.name))
 207                         with indent():
 208                             out('{0} = NULL;'.format(p.name))
 209                         if i < len(func.variable_params):
 210                             out('else')
 211                             with indent():
 212                                 out('variable_data += {0};'.format(p.size_string(False, marshal = 1)))
 213                     elif i < len(func.variable_params):
 214                         out('variable_data += {0};'.format(p.size_string(False, marshal = 1)))
 215                     i += 1
 216
 217             self.print_sync_call(func, unmarshal = 1)
 218         out('}')
 219
 220     def validate_count_or_fallback(self, func):
 221         # Check that any counts for variable-length arguments might be < 0, in
 222         # which case the command alloc or the memcpy would blow up before we
 223         # get to the validation in Mesa core.
 224         list = []
 225         for p in func.parameters:
 226             if p.is_variable_length():
 227                 list.append('{0}_size < 0'.format(p.name))
 228                 list.append('({0}_size > 0 && !{0})'.format(p.name))
 229
 230         if len(list) == 0:
 231             return
 232
 233         list.append('(unsigned)cmd_size > MARSHAL_MAX_CMD_SIZE')
 234
 235         out('if (unlikely({0})) {{'.format(' || '.join(list)))
 236         with indent():
 237             out('_mesa_glthread_finish_before(ctx, "{0}");'.format(func.name))
 238             self.print_sync_dispatch(func)
 239             out('return;')
 240         out('}')
 241
 242     def print_async_marshal(self, func):
 243         out('static void GLAPIENTRY')
 244         out('_mesa_marshal_{0}({1})'.format(
 245                 func.name, func.get_parameter_string()))
 246         out('{')
 247         with indent():
 248             out('GET_CURRENT_CONTEXT(ctx);')
 249             for p in func.variable_params:
 250                 out('int {0}_size = {1};'.format(p.name, p.size_string(marshal = 1)))
 251
 252             struct = 'struct marshal_cmd_{0}'.format(func.name)
 253             size_terms = ['sizeof({0})'.format(struct)]
 254             for p in func.variable_params:
 255                 if p.img_null_flag:
 256                     size_terms.append('({0} ? {0}_size : 0)'.format(p.name))
 257                 else:
 258                     size_terms.append('{0}_size'.format(p.name))
 259             out('int cmd_size = {0};'.format(' + '.join(size_terms)))
 260             out('{0} *cmd;'.format(struct))
 261
 262             out('debug_print_marshal("{0}");'.format(func.name))
 263
 264             self.validate_count_or_fallback(func)
 265
 266             if func.marshal_fail:
 267                 out('if ({0}) {{'.format(func.marshal_fail))
 268                 with indent():
 269                     out('_mesa_glthread_disable(ctx, "{0}");'.format(func.name))
 270                     self.print_sync_dispatch(func)
 271                     out('return;')
 272                 out('}')
 273
 274             if func.marshal_sync:
 275                 out('if ({0}) {{'.format(func.marshal_sync))
 276                 with indent():
 277                     out('_mesa_glthread_finish_before(ctx, "{0}");'.format(func.name))
 278                     self.print_sync_dispatch(func)
 279                     out('return;')
 280                 out('}')
 281
 282         with indent():
 283             self.print_async_dispatch(func)
 284         out('}')
 285
 286     def print_async_body(self, func):
 287         out('/* {0}: marshalled asynchronously */'.format(func.name))
 288         self.print_async_struct(func)
 289         self.print_async_unmarshal(func)
 290         self.print_async_marshal(func)
 291         out('')
 292         out('')
 293
 294     def print_unmarshal_dispatch_cmd(self, api):
 295         out('const _mesa_unmarshal_func _mesa_unmarshal_dispatch[NUM_DISPATCH_CMD] = {')
 296         with indent():
 297             for func in api.functionIterateAll():
 298                 flavor = func.marshal_flavor()
 299                 if flavor in ('skip', 'sync'):
 300                     continue
 301                 out('[DISPATCH_CMD_{0}] = (_mesa_unmarshal_func)_mesa_unmarshal_{0},'.format(func.name))
 302         out('};')
 303         out('')
 304         out('')
 305
 306     def print_create_marshal_table(self, api):
 307         out('struct _glapi_table *')
 308         out('_mesa_create_marshal_table(const struct gl_context *ctx)')
 309         out('{')
 310         with indent():
 311             out('struct _glapi_table *table;')
 312             out('')
 313             out('table = _mesa_alloc_dispatch_table();')
 314             out('if (table == NULL)')
 315             with indent():
 316                 out('return NULL;')
 317             out('')
 318             for func in api.functionIterateAll():
 319                 if func.marshal_flavor() == 'skip':
 320                     continue
 321                 out('SET_{0}(table, _mesa_marshal_{0});'.format(func.name))
 322             out('')
 323             out('return table;')
 324         out('}')
 325         out('')
 326         out('')
 327
 328     def printBody(self, api):
 329         async_funcs = []
 330         for func in api.functionIterateAll():
 331             flavor = func.marshal_flavor()
 332             if flavor in ('skip', 'custom'):
 333                 continue
 334             elif flavor == 'async':
 335                 self.print_async_body(func)
 336                 async_funcs.append(func)
 337             elif flavor == 'sync':
 338                 self.print_sync_body(func)
 339         self.print_unmarshal_dispatch_cmd(api)
 340         self.print_create_marshal_table(api)
 341
 342
 343 def show_usage():
 344     print('Usage: %s [-f input_file_name]' % sys.argv[0])
 345     sys.exit(1)
 346
 347
 348 if __name__ == '__main__':
 349     file_name = 'gl_API.xml'
 350
 351     try:
 352         (args, trail) = getopt.getopt(sys.argv[1:], 'm:f:')
 353     except Exception:
 354         show_usage()
 355
 356     for (arg,val) in args:
 357         if arg == '-f':
 358             file_name = val
 359
 360     printer = PrintCode()
 361
 362     api = gl_XML.parse_GL_API(file_name, marshal_XML.marshal_item_factory())
 363     printer.Print(api)