[cfe-dev] Basic source-to-source transformation with Clang

[Manuel Klimek]

On Fri, Jul 6, 2012 at 2:33 PM, Satya Prakash Prasad <
satyaprakash.prasad at gmail.com> wrote:

> Thanks for the information as provided, but I get output like below:
>
> (CallExpr 0x1a85c480 'int'
>   (ImplicitCastExpr 0x1a85c468 'int (*)(const char *restrict, ...)'
> <FunctionToPointerDecay>
>     (DeclRefExpr 0x1a85c3e8 'int (const char *restrict, ...)' lvalue
> Function 0x1a84e8e0 'printf' 'int (const char *restrict, ...)'))
>   (ImplicitCastExpr 0x1a85c4b8 'const char *' <ArrayToPointerDecay>
>     (StringLiteral 0x1a85c388 'const char [13]' lvalue "In inc [%d]\n"))
>   (ImplicitCastExpr 0x1a85c4d0 'int' <LValueToRValue>
>     (DeclRefExpr 0x1a85c3c0 'int' lvalue ParmVar 0x1a85c100 'p' 'int &')))
>
> Kindly note that my requirement is to print the C++ code itself like
> dumpAll() method generated for above for below C++ code:
>

If you want to print the C++ code that produce the AST, you'll want to get
the SourceRange, and use SourceManager's getCharacterData() method to get
the underlying data - that will get you the C++ code as it was written by
the user.

Cheers,
/Manuel

>
> p++;
>
> Similarly for other like:
>
> dumpAll()
>
> (CallExpr 0x1a85dec8 'int'
>   (ImplicitCastExpr 0x1a85deb0 'int (*)(const char *restrict, ...)'
> <FunctionToPointerDecay>
>     (DeclRefExpr 0x1a85de88 'int (const char *restrict, ...)' lvalue
> Function 0x1a84e8e0 'printf' 'int (const char *restrict, ...)'))
>   (ImplicitCastExpr 0x1a85df08 'const char *' <ArrayToPointerDecay>
>     (StringLiteral 0x1a85cdd8 'const char [19]' lvalue "y = [%d] z =
> [%d]\n"))
>   (ImplicitCastExpr 0x1a85df20 'int' <LValueToRValue>
>     (DeclRefExpr 0x1a85ce18 'int' lvalue Var 0x1a85c6f0 'y' 'int'))
>   (ImplicitCastExpr 0x1a85df38 'int' <LValueToRValue>
>     (DeclRefExpr 0x1a85de60 'int' lvalue Var 0x1a85c760 'z' 'int')))
>
> While C++ Code:
>
> printf("y = [%d] z = [%d]\n", y , z);
>
> Thanks in advance.
>
> Regards,
> Prakash
>
>
> On Fri, Jul 6, 2012 at 4:22 PM, Manuel Klimek <klimek at google.com> wrote:
> > On Fri, Jul 6, 2012 at 12:25 PM, Satya Prakash Prasad
> > <satyaprakash.prasad at gmail.com> wrote:
> >>
> >> I made some progress with whatever support I received from this
> >> discussion forum. Thanks to all who responded to my request. My
> >> requirement now is to find a way I can print CLANG AST code to C++ / C
> >> human readable statements:
> >>
> >>     bool VisitStmt(Stmt *s) {
> >>         if (isa<CompoundStmt>(s)) {
> >>                 CompoundStmt *S = cast<CompoundStmt>(s);
> >>                 for (CompoundStmt::body_iterator  I = S->body_begin(),
> >> E = S->body_end(); I != E; ++I)
> >>                 {
> >>                         Stmt *i =  cast<Stmt>(*I);
> >>                         //How can I print the C++ / C statement which
> >> CLANG is processing
> >
> >
> > You can use i->dumpAll() if you want to see what's going on.
> >
> > Cheers,
> > /Manuel
> >
> >>
> >>                 }
> >>         }
> >>
> >>         return true;
> >>     }
> >>
> >> Regards,
> >> Prakash
> >>
> >> _______________________________________________
> >> cfe-dev mailing list
> >> cfe-dev at cs.uiuc.edu
> >> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
> >
> >
>
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