Em Sun 12 Jun 2005 23:58, James A. Morrison escreveu:
> Was there anything in particular that you found hard to understand in the
> treelang frontend. It is supposed to be the example/tutorial front-end.
One thing is that the parser is very big and mixed with C code. I find it
easier to read a parser without side effects that just builds a abstract
syntax tree ("Modern compiler implementation in ML" influence...). Just
moving some of the C code to auxiliary functions in parse-aux.c would be very
helpfull (are you interested in this patch(s)?).> I suppose I should update this howto for gcc4. That would be wonderfull!!! > Mapped locations are a better(tm) way of tracking source locations > throughout the compilation. Thanks. > Perhaps, but the implementation may be the same because of how the > callbacks used to be implemented. With the langhooks it should be easy for > any frontend to use the default implementation of a calback. Convert is called directly and not through langhooks. Why? Some call backs don't have a default: LANG_HOOKS_BUILTIN_FUNCTION for example. > Where? I build NOP_EXPRs around the use of variables, in the treelang > frontend so I can get accurate source locations for where variables are > used. at build_string_literal in hello1.c (copied from builtins.c). This looks like a lot of work to build a string. I tried to use something similar to gfc_build_string_const (fortran/trans-const.c) but failed. > function_end_locus is part of the function struct, which in treelang there > is only cfun at any given time. > > The answer is in tree.h:833, > In a FUNCTION_DECL, nonzero if function has been defined. but in tree.h:2092 /* In a VAR_DECL or FUNCTION_DECL, nonzero means external reference: do not allocate storage, and refer to a definition elsewhere. */ So a function can be defined and have a "definition elsewhere" at the same time? Isn't it true that DECL_EXTERNAL(n) != TREE_STATIC(n) for all n? > That's good. Perhaps with some help we can clean up the interfaces some > more. I will try to help as I try to undertend the current one :) Thank you very much for yours comments. Rafael vila de Espndola
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