Re: C2026 error in VC++ with large number of tokens

[Akim Demaille]

Hi Vince,

> Le 22 août 2021 à 03:58, Vince Huffaker <vince@vincejulie.com> a écrit :
> 
> Hi,
> 
> Thank you for your reply. See the input file, ApReadBinary.ypp (I have 
> reduced it greatly from the original).  The HPP file has the bad line at line 
> # 3900 - the YY_ASSERT is too long.

But line 3900 is no long, if you read "line" in the text file sense:

>    3900         YY_ASSERT (tok == token::YYEOF
>    3901                    || tok == token::YYerror
>    3902                    || tok == token::YYUNDEF
>    3903                    || (token::AF_SMART_POINTER_INT <= tok && tok <= 
> token::AF_POINT2RD_VECTOR_END)
>    3904                    || (token::AF_ATTR_MODEL_VIEW <= tok && tok <= 
> token::AF_ATTR_TEXTURE_MAPPING)
>    3905                    || (token::AF_TESSELLATION_BEGIN <= tok && tok <= 
> token::AF_TESS_TRIANGLE_ARRAY)
> ...
>    3998                    || (token::CS_PLANE_TO_PLANE3D_V2_END <= tok && 
> tok <= token::CS_PERPENDICULAR_PLANES3D_REF_V2_END)
>    3999                    || tok == token::CS_COINCIDENT_POINTS_REF_V4_BEGIN
>    4000                    || (token::CS_COINCIDENT_POINTS_V4_BEGIN <= tok && 
> tok <= token::CS_COINCIDENT_POINTS_V4_END)
>    4001                    || (token::CS_COINCIDENT_POINTS_REF_V4_END <= tok 
> && tok <= token::CS_CYLINDER3D_V7_END));
>    4002       }

So I guess you are telling me that the problem is the "line" in the sense of 
the C preprocessor?

I guess I should just ignore this assertion when we are under Visual, i.e., 
emit something like

> #ifndef MSVC
>  YY_ASSERT (tok == token::YYEOF
>             || tok == token::YYerror
>             || tok == token::YYUNDEF
>             || (token::AF_SMART_POINTER_INT <= tok && tok <= 
> token::AF_POINT2RD_VECTOR_END)
>             || (token::AF_ATTR_MODEL_VIEW <= tok && tok <= 
> token::AF_ATTR_TEXTURE_MAPPING)
>             || (token::AF_TESSELLATION_BEGIN <= tok && tok <= 
> token::AF_TESS_TRIANGLE_ARRAY)
> ...
>             || (token::CS_PLANE_TO_PLANE3D_V2_END <= tok && tok <= 
> token::CS_PERPENDICULAR_PLANES3D_REF_V2_END)
>             || tok == token::CS_COINCIDENT_POINTS_REF_V4_BEGIN
>             || (token::CS_COINCIDENT_POINTS_V4_BEGIN <= tok && tok <= 
> token::CS_COINCIDENT_POINTS_V4_END)
>             || (token::CS_COINCIDENT_POINTS_REF_V4_END <= tok && tok <= 
> token::CS_CYLINDER3D_V7_END));
> #endif

Could you please add these lines (#ifndef/#endif) and tell me if it does fix 
your issue?


Also, do you really need to specify the numbers for all the tokens?  It is 
because you gave these numbers that the assertion is long.  If bison had 
numbered itself, there wouldn't be holes, and the assertions is short.  Why do 
you provide the token numbers?

Cheers!