src/tools/vppapigen/vppapigen_c.py

   1 # C generation
   2 import datetime
   3 import os
   4 import time
   5
   6 datestring = datetime.datetime.utcfromtimestamp(int(os.environ.get('SOURCE_DATE_EPOCH', time.time())))
   7 input_filename = 'inputfil'
   8 top_boilerplate = '''\
   9 /*
  10  * VLIB API definitions {datestring}
  11  * Input file: {input_filename}
  12  * Automatically generated: please edit the input file NOT this file!
  13  */
  14
  15 #if defined(vl_msg_id)||defined(vl_union_id) \\
  16     || defined(vl_printfun) ||defined(vl_endianfun) \\
  17     || defined(vl_api_version)||defined(vl_typedefs) \\
  18     || defined(vl_msg_name)||defined(vl_msg_name_crc_list) \\
  19     || defined(vl_api_version_tuple)
  20 /* ok, something was selected */
  21 #else
  22 #warning no content included from {input_filename}
  23 #endif
  24
  25 #define VL_API_PACKED(x) x __attribute__ ((packed))
  26 '''
  27
  28 bottom_boilerplate = '''\
  29 /****** API CRC (whole file) *****/
  30
  31 #ifdef vl_api_version
  32 vl_api_version({input_filename}, {file_crc:#08x})
  33
  34 #endif
  35 '''
  36
  37
  38 def msg_ids(s):
  39     output = '''\
  40
  41 /****** Message ID / handler enum ******/
  42
  43 #ifdef vl_msg_id
  44 '''
  45
  46     for t in s['Define']:
  47         output += "vl_msg_id(VL_API_%s, vl_api_%s_t_handler)\n" % \
  48                   (t.name.upper(), t.name)
  49     output += "#endif"
  50
  51     return output
  52
  53
  54 def msg_names(s):
  55     output = '''\
  56
  57 /****** Message names ******/
  58
  59 #ifdef vl_msg_name
  60 '''
  61
  62     for t in s['Define']:
  63         dont_trace = 0 if t.dont_trace else 1
  64         output += "vl_msg_name(vl_api_%s_t, %d)\n" % (t.name, dont_trace)
  65     output += "#endif"
  66
  67     return output
  68
  69
  70 def msg_name_crc_list(s, suffix):
  71     output = '''\
  72
  73 /****** Message name, crc list ******/
  74
  75 #ifdef vl_msg_name_crc_list
  76 '''
  77     output += "#define foreach_vl_msg_name_crc_%s " % suffix
  78
  79     for t in s['Define']:
  80         output += "\\\n_(VL_API_%s, %s, %08x) " % \
  81                    (t.name.upper(), t.name, t.crc)
  82     output += "\n#endif"
  83
  84     return output
  85
  86
  87 def duplicate_wrapper_head(name):
  88     s = "#ifndef defined_%s\n" % name
  89     s += "#define defined_%s\n" % name
  90     return s
  91
  92
  93 def duplicate_wrapper_tail():
  94     return '#endif\n\n'
  95
  96
  97 def typedefs(objs, filename):
  98     name = filename.replace('.', '_')
  99     output = '''\
 100
 101
 102 /****** Typedefs ******/
 103
 104 #ifdef vl_typedefs
 105 #ifndef included_{module}
 106 #define included_{module}
 107 '''
 108     output = output.format(module=name)
 109     for o in objs:
 110         tname = o.__class__.__name__
 111         output += duplicate_wrapper_head(o.name)
 112         if tname == 'Enum':
 113             output += "typedef enum {\n"
 114             for b in o.block:
 115                 output += "    %s = %s,\n" % (b[0], b[1])
 116             output += '} vl_api_%s_t;\n' % o.name
 117         else:
 118             if tname == 'Union':
 119                 output += "typedef VL_API_PACKED(union _vl_api_%s {\n" % o.name
 120             else:
 121                 output += "typedef VL_API_PACKED(struct _vl_api_%s {\n" % o.name
 122             for b in o.block:
 123                 if b.type == 'Field':
 124                     output += "    %s %s;\n" % (b.fieldtype, b.fieldname)
 125                 elif b.type == 'Array':
 126                     if b.lengthfield:
 127                         output += "    %s %s[0];\n" % (b.fieldtype, b.fieldname)
 128                     else:
 129                         output += "    %s %s[%s];\n" % (b.fieldtype, b.fieldname,
 130                                                         b.length)
 131                 else:
 132                     raise ValueError("Error in processing array type %s" % b)
 133
 134             output += '}) vl_api_%s_t;\n' % o.name
 135         output += duplicate_wrapper_tail()
 136
 137     output += "\n#endif"
 138     output += "\n#endif\n\n"
 139
 140     return output
 141
 142
 143 format_strings = {'u8': '%u',
 144                   'i8': '%d',
 145                   'u16': '%u',
 146                   'i16': '%d',
 147                   'u32': '%u',
 148                   'i32': '%ld',
 149                   'u64': '%llu',
 150                   'i64': '%llu',
 151                   'f64': '%.2f', }
 152
 153
 154 def printfun(objs):
 155     output = '''\
 156 /****** Print functions *****/
 157 #ifdef vl_printfun
 158
 159 #ifdef LP64
 160 #define _uword_fmt \"%lld\"
 161 #define _uword_cast (long long)
 162 #else
 163 #define _uword_fmt \"%ld\"
 164 #define _uword_cast long
 165 #endif
 166
 167 '''
 168     for t in objs:
 169         if t.__class__.__name__ == 'Enum':
 170             continue
 171         if t.manual_print:
 172             output += "/***** manual: vl_api_%s_t_print  *****/\n\n" % t.name
 173             continue
 174         output += duplicate_wrapper_head(t.name + '_t_print')
 175         output += "static inline void *vl_api_%s_t_print (vl_api_%s_t *a," % \
 176                   (t.name, t.name)
 177         output += "void *handle)\n{\n"
 178         output += "    vl_print(handle, \"vl_api_%s_t:\\n\");\n" % t.name
 179
 180         for o in t.block:
 181             if o.type != 'Field':
 182                 continue
 183             if o.fieldtype in format_strings:
 184                 output += "    vl_print(handle, \"%s: %s\\n\", a->%s);\n" % \
 185                           (o.fieldname, format_strings[o.fieldtype],
 186                            o.fieldname)
 187
 188         output += '    return handle;\n'
 189         output += '}\n\n'
 190         output += duplicate_wrapper_tail()
 191
 192     output += "\n#endif /* vl_printfun */\n"
 193
 194     return output
 195
 196
 197 endian_strings = {
 198     'u16': 'clib_net_to_host_u16',
 199     'u32': 'clib_net_to_host_u32',
 200     'u64': 'clib_net_to_host_u64',
 201     'i16': 'clib_net_to_host_u16',
 202     'i32': 'clib_net_to_host_u32',
 203     'i64': 'clib_net_to_host_u64',
 204 }
 205
 206
 207 def endianfun(objs):
 208     output = '''\
 209
 210 /****** Endian swap functions *****/\n\
 211 #ifdef vl_endianfun
 212
 213 #undef clib_net_to_host_uword
 214 #ifdef LP64
 215 #define clib_net_to_host_uword clib_net_to_host_u64
 216 #else
 217 #define clib_net_to_host_uword clib_net_to_host_u32
 218 #endif
 219
 220 '''
 221
 222     for t in objs:
 223         if t.__class__.__name__ == 'Enum':
 224             continue
 225         if t.manual_endian:
 226             output += "/***** manual: vl_api_%s_t_endian  *****/\n\n" % t.name
 227             continue
 228         output += duplicate_wrapper_head(t.name + '_t_endian')
 229         output += "static inline void vl_api_%s_t_endian (vl_api_%s_t *a)" % \
 230                   (t.name, t.name)
 231         output += "\n{\n"
 232
 233         for o in t.block:
 234             if o.type != 'Field':
 235                 continue
 236             if o.fieldtype in endian_strings:
 237                 output += "    a->%s = %s(a->%s);\n" % \
 238                         (o.fieldname, endian_strings[o.fieldtype], o.fieldname)
 239             else:
 240                 output += "    /* a->%s = a->%s (no-op) */\n" % \
 241                                           (o.fieldname, o.fieldname)
 242
 243         output += '}\n\n'
 244         output += duplicate_wrapper_tail()
 245     output += "\n#endif /* vl_endianfun */\n\n"
 246
 247     return output
 248
 249
 250 def version_tuple(s, module):
 251     output = '''\
 252 /****** Version tuple *****/
 253
 254 #ifdef vl_api_version_tuple
 255
 256 '''
 257     if 'version' in s['Option']:
 258         v = s['Option']['version']
 259         (major, minor, patch) = v.split('.')
 260         output += "vl_api_version_tuple(%s, %s, %s, %s)\n" % \
 261                   (module, major, minor, patch)
 262
 263     output += "\n#endif /* vl_api_version_tuple */\n\n"
 264
 265     return output
 266
 267
 268 #
 269 # Plugin entry point
 270 #
 271 def run(input_filename, s, file_crc):
 272     basename = os.path.basename(input_filename)
 273     filename, file_extension = os.path.splitext(basename)
 274     output = top_boilerplate.format(datestring=datestring,
 275                                     input_filename=basename)
 276     output += msg_ids(s)
 277     output += msg_names(s)
 278     output += msg_name_crc_list(s, filename)
 279     output += typedefs(s['types'] + s['Define'], filename + file_extension)
 280     output += printfun(s['types'] + s['Define'])
 281     output += endianfun(s['types'] + s['Define'])
 282     output += version_tuple(s, basename)
 283     output += bottom_boilerplate.format(input_filename=basename,
 284                                         file_crc=file_crc)
 285
 286     return output