diff options
Diffstat (limited to 'generator/nanopb_generator.py')
| -rw-r--r-- | generator/nanopb_generator.py | 63 |
1 files changed, 37 insertions, 26 deletions
diff --git a/generator/nanopb_generator.py b/generator/nanopb_generator.py index 405fedaf..9e2a30ed 100644 --- a/generator/nanopb_generator.py +++ b/generator/nanopb_generator.py @@ -252,19 +252,17 @@ class Field: return result - def needs_32bit_pb_field_t(self): - '''Determine if this field needs 32bit pb_field_t structure to compile properly. - Returns True, False or a C-expression for assert.''' - if self.tag > 255 or self.max_size > 255: - return True - + def largest_field_value(self): + '''Determine if this field needs 16bit or 32bit pb_field_t structure to compile properly. + Returns numeric value or a C-expression for assert.''' if self.ltype == 'PB_LTYPE_SUBMESSAGE': if self.htype == 'PB_HTYPE_ARRAY': - return 'pb_membersize(%s, %s[0]) > 255' % (self.struct_name, self.name) + return 'pb_membersize(%s, %s[0])' % (self.struct_name, self.name) else: - return 'pb_membersize(%s, %s) > 255' % (self.struct_name, self.name) - - return False + return 'pb_membersize(%s, %s)' % (self.struct_name, self.name) + + return max(self.tag, self.max_size, self.max_count) + class Message: def __init__(self, names, desc): @@ -426,28 +424,41 @@ def generate_header(dependencies, headername, enums, messages): yield ' setting PB_MAX_REQUIRED_FIELDS to %d or more.\n' % largest_count yield '#endif\n' - worst = False + worst = 0 worst_field = '' + checks = [] for msg in messages: for field in msg.fields: - status = field.needs_32bit_pb_field_t() - if status == True: - worst = True + status = field.largest_field_value() + if isinstance(status, (str, unicode)): + checks.append(status) + elif status > worst: + worst = status worst_field = str(field.struct_name) + '.' + str(field.name) - elif status != False: - if worst == False: - worst = status - elif worst != True: - worst += ' || ' + status - if worst != False: + if worst > 255 or checks: yield '\n/* Check that field information fits in pb_field_t */\n' - yield '#ifndef PB_MANY_FIELDS\n' - if worst == True: - yield '#error Field descriptor for %s is too large. Define PB_MANY_FIELDS to fix this.\n' % worst_field - else: - yield 'STATIC_ASSERT(!(%s), YOU_MUST_DEFINE_PB_MANY_FIELDS)\n' % worst - yield '#endif\n' + yield '/* (Largest message has %d fields' % worst + if checks: yield ' and submessages have to be checked at compile-time.' + yield ') */\n' + + if worst < 65536: + yield '#if !defined(PB_FIELD_16BIT) && !defined(PB_FIELD_32BIT)\n' + if worst > 255: + yield '#error Field descriptor for %s is too large. Define PB_FIELD_16BIT to fix this.\n' % worst_field + else: + assertion = ' && '.join(str(c) + ' < 256' for c in checks) + yield 'STATIC_ASSERT((%s), YOU_MUST_DEFINE_PB_FIELD_16BIT)\n' % assertion + yield '#endif\n\n' + + if worst > 65535 or checks: + yield '#if !defined(PB_FIELD_32BIT)\n' + if worst > 65535: + yield '#error Field descriptor for %s is too large. Define PB_FIELD_32BIT to fix this.\n' % worst_field + else: + assertion = ' && '.join(str(c) + ' < 65536' for c in checks) + yield 'STATIC_ASSERT((%s), YOU_MUST_DEFINE_PB_FIELD_32BIT)\n' % assertion + yield '#endif\n' # End of header yield '\n#endif\n' |