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概要[]
引数[]
- cpp_reader *pfile
実装[]
1035 /* External routine to get a token. Also used nearly everywhere
1036 internally, except for places where we know we can safely call
1037 _cpp_lex_token directly, such as lexing a directive name.
1038
1039 Macro expansions and directives are transparently handled,
1040 including entering included files. Thus tokens are post-macro
1041 expansion, and after any intervening directives. External callers
1042 see CPP_EOF only at EOF. Internal callers also see it when meeting
1043 a directive inside a macro call, when at the end of a directive and
1044 state.in_directive is still 1, and at the end of argument
1045 pre-expansion. */
1046 const cpp_token *
1047 cpp_get_token (cpp_reader *pfile)
1048 {
1049 const cpp_token *result;
1050
1051 for (;;)
1052 {
1053 cpp_hashnode *node;
1054 cpp_context *context = pfile->context;
1055
1056 /* Context->prev == 0 <=> base context. */
1057 if (!context->prev)
1058 result = _cpp_lex_token (pfile);
1059 else if (FIRST (context).token != LAST (context).token)
1060 {
1061 if (context->direct_p)
1062 result = FIRST (context).token++;
1063 else
1064 result = *FIRST (context).ptoken++;
1065
1066 if (result->flags & PASTE_LEFT)
1067 {
1068 paste_all_tokens (pfile, result);
1069 if (pfile->state.in_directive)
1070 continue;
1071 return padding_token (pfile, result);
1072 }
1073 }
1074 else
1075 {
1076 _cpp_pop_context (pfile);
1077 if (pfile->state.in_directive)
1078 continue;
1079 return &pfile->avoid_paste;
1080 }
1081
1082 if (pfile->state.in_directive && result->type == CPP_COMMENT)
1083 continue;
1084
1085 if (result->type != CPP_NAME)
1086 break;
1087
1088 node = result->val.node;
1089
1090 if (node->type != NT_MACRO || (result->flags & NO_EXPAND))
1091 break;
1092
1093 if (!(node->flags & NODE_DISABLED))
1094 {
1095 if (!pfile->state.prevent_expansion
1096 && enter_macro_context (pfile, node))
1097 {
1098 if (pfile->state.in_directive)
1099 continue;
1100 return padding_token (pfile, result);
1101 }
1102 }
1103 else
1104 {
1105 /* Flag this token as always unexpandable. FIXME: move this
1106 to collect_args()?. */
1107 cpp_token *t = _cpp_temp_token (pfile);
1108 t->type = result->type;
1109 t->flags = result->flags | NO_EXPAND;
1110 t->val = result->val;
1111 result = t;
1112 }
1113
1114 break;
1115 }
1116
1117 return result;
1118 }
