[antlr-interest] calling parser from c++, correct way?

[Anders.Karlsson at sybase.com]

Hi Jim,

It seems I have this issue only when running with VS2010, the main program
is in C++ and the generated lexer/parser are kept as C-files (tried also
compiling them as C++ files, same result).

The same parser/lexer seems to work under objective-c(and Java of course)
however when running it from within VS2010 the function pointers in the CTX
seem to either not be set or set to wrong functions during run-time, not
sure if the debugger is showing wrong and this is just normal behavior or
if what I am seeing is a memory overwrite that occurs inside the generated
parser. Are there any particular switches when compiling the library that
needs to be set, something specific when using VS2010? I've been fiddling
with pragma pack(1) thinking it had something to do with the structures not
aligning up on byte boundary but that didn't help as well, I have tried
both unicode and multibyte same problem.

Since I am running under Windows/VS2010 I don't have Valgrind but I will
try and see if I can dig up Boundschecker today

Another observation is that the problem seems to depend on the expression,
so I was thinking maybe my grammar had broken some unwritten laws for how a
grammar should look like :-)



Thank you and kind regards,
Anders



Anders Karlsson | Staff SE II, Architect | Sybase Inc, Singapore, ( +65
6571 3125 | * anders.karlsson at sybase.com
-- It takes a tonne of fact to overcome an ounce of opinion


<antlr-interest-bounces at antlr.org> wrote on 06/16/2010 01:54:50 AM:

> Jim Idle <jimi at temporal-wave.com>
> Sent by: <antlr-interest-bounces at antlr.org>
>
> 06/16/2010 01:54 AM
>
> To
>
> "Anders.Karlsson at sybase.com" <Anders.Karlsson at sybase.com>
>
> cc
>
> antlr-interest Interest <antlr-interest at antlr.org>
>
> Subject
>
> Re: [antlr-interest] calling parser from c++, correct way?
>
> Try copying the examples and see where your issue is or use valgrind.
> I am yravellling this week so difficult to spend more time looking.
>
> Jim
>
> On Jun 15, 2010, at 2:00, Anders.Karlsson at sybase.com wrote:
>
> > Hi,
> >
> > Is this the correct way to call the antlr-runtime from C++? (It
> > seems I
> > have some memory overwrite issues so that is why I am asking)
> >
> > I have a string with the content I want to parse (e.g. string s =
> > "1+1")
> >
> >
> >      pANTLR3_INPUT_STREAM input = antlr3NewAsciiStringInPlaceStream(
> > reinterpret_cast<pANTLR3_UINT8>(const_cast<char*>(s.c_str())),
> > (ANTLR3_UINT64)s.length(), NULL);
> >      pMAExpressionLexer lxr = MAExpressionLexerNew(input);
> >      pANTLR3_COMMON_TOKEN_STREAM tstream =
> > antlr3CommonTokenStreamSourceNew(ANTLR3_SIZE_HINT, TOKENSOURCE(lxr));
> >      pMAExpressionParser psr = MAExpressionParserNew(tstream);
> >      MAExpressionParser_ma_expression_return r = psr->ma_expression
> > (psr);
> > // calling the start rule for parsing
> >
> > when I later free psr it crashes
> >
> >        psr->free(psr); psr = NULL;
> > Has anybody an idea what I am doing wrong?
> > Thank you and kind regards,
> > Anders
> >
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