bison中属性结构问题

fineamy 发表于 2008-06-21 10:34

number: BASED_NUMBER
      { $$ = $1; based_size = 0;}
   | DEC_NUMBER
      { $$ = $1; based_size = 0;}
   | DEC_NUMBER BASED_NUMBER
      { $$ = pform_verinum_with_size($1,$2, @2.text, @2.first_line);
      based_size = 0; }
请问一下,上面@2.text 代表什么,
@2.first_line在手册中可以查到,好象代表BASED_NUMBER的所在行号吧?但还不是很明白,能否解释下?

fineamy 发表于 2008-06-21 10:43

不好意思,刚看到,赶紧贴上来

/* Recent version of bison expect that the user supply a
YYLLOC_DEFAULT macro that makes up a yylloc value from existing
values. I need to supply an explicit version to account for the
text field, that otherwise won't be copied. */
# define YYLLOC_DEFAULT(Current, Rhs, N)do {    \
(Current).first_line = (Rhs).first_line;    \
(Current).first_column = (Rhs).first_column; \
(Current).last_line = (Rhs).last_line;    \
(Current).last_column= (Rhs).last_column; \
(Current).text       = (Rhs).text; } while (0)

这里作者已经做了解释

cjaizss 发表于 2008-06-21 17:24

bison的扩展，可以更方便的调试之类。
我没用过

很快乐 发表于 2008-06-24 20:23

学习了，这个我不会呢1

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Chinaunix's Archiver

bison中属性结构问题

不好意思,刚看到,赶紧贴上来