Hi Jot, > Le 27 nov. 2020 à 02:15, Jot Dot <jot...@shaw.ca> a écrit : > > While beating my head senseless trying to get my first flex/bison (c++ style) > project going,
Have you looked at the examples in examples/c++? > I try to catch some error tokens inside my bison rules to aid me by supplying > diagnostic output. > I added a second error token into a rule to debug an issue I'm trying to > figure out (which I posted in help-bison). I have not received your message on help-bison (https://lists.gnu.org/r/help-bison/). What do you mean by "I added a second error token into a rule"? Could you please show that rule? > 1>D:\data\c\FlexBisonLoader\My_Parser\parser.cpp(454,26): warning C4244: > 'return': conversion from 'const short' to 'gen::Parser::state_type', > possible loss of data > > The following snippet of code in the generated .cpp source file: > Parser ::state_type > Parser ::yy_lr_goto_state_ (state_type yystate, int yysym) > { > int yyr = yypgoto_[yysym - YYNTOKENS] + yystate; > if (0 <= yyr && yyr <= yylast_ && yycheck_[yyr] == yystate) > return yytable_[yyr]; > else > return yydefgoto_[yysym - YYNTOKENS]; <<<<<<<< Warning. > } > > Now this is probably just a nuisance message that can be safely ignored, but > I wanted to bring it up to your attention. > IMO the return value just needs to be cast to Parser::state_type. The definition of state_type depends on the grammar. What is your definition? > Also, when I add that extra error line, my app freezes. Now, I'm 99% sure > this freeze is from what I'm doing, but that 1% tells me that I've never had > this compile issue, It's a bit odd, and this parser is a state engine which > might be in the wrong place.. etc. I've already triggered two Microsoft bugs > in this single project / endeavour, slowing me down, so now I'm getting a bit > paranoid. You may want to try another compiler too :) > Due to the odd behaviour, I figure I'd run it past you just to make sure. Your compiler might be right. I think it's unlikely, but it's possible. To understand why it warns, I need the definition of state_type. Cheers!
