AST for For loop

[Monalisa Rout via cfe-commits]

Awesome, thanks!

On Tue, Aug 6, 2019 at 5:18 PM Aaron Ballman <aaron at aaronballman.com> wrote:

> On Tue, Aug 6, 2019 at 11:15 AM Monalisa Rout via cfe-commits
> <cfe-commits at lists.llvm.org> wrote:
> >
> > Hello,
> > While dumping the AST for For loop, Why do I get  <<<NULL>>> ??
> >
> > Source code:
> > void func()
> > {
> > for (int i = 0; i < 5; i++)
> > break;
> > }
> >
> > AST
> >
> > FunctionDecl 0x4a4ac10
> <D:\Data\Rout\ASTJSONProject\ASTJSONProject\typeof.c:2:1, line:6:1>
> line:2:6 func 'void ()'
> > `-CompoundStmt 0x4a4ae1c <line:3:1, line:6:1>
> >   `-ForStmt 0x4a4adf8 <line:4:2, line:5:3>
> >     |-DeclStmt 0x4a4ad38 <line:4:7, col:16>
> >     | `-VarDecl 0x4a4acd0 <col:7, col:15> col:11 used i 'int' cinit
> >     |   `-IntegerLiteral 0x4a4ad10 <col:15> 'int' 0
> >     |-<<<NULL>>>
> >     |-BinaryOperator 0x4a4ada8 <col:18, col:22> 'int' '<'
> >     | |-ImplicitCastExpr 0x4a4ad98 <col:18> 'int' <LValueToRValue>
> >     | | `-DeclRefExpr 0x4a4ad50 <col:18> 'int' lvalue Var 0x4a4acd0 'i'
> 'int'
> >     | `-IntegerLiteral 0x4a4ad70 <col:22> 'int' 5
> >     |-UnaryOperator 0x4a4ade0 <col:25, col:26> 'int' postfix '++'
> >     | `-DeclRefExpr 0x4a4adc0 <col:25> 'int' lvalue Var 0x4a4acd0 'i'
> 'int'
> >     `-BreakStmt 0x4a4adf0 <line:5:3>
>
> The AST dumps child nodes by calling children() on a given AST node.
> The ForStmt node always has five child nodes, which are (in order):
> init statement, condition variable, condition, increment, and body.
> Some of those may be NULL depending on the format of the for loop
> (your for loop example has no condition variable, for instance).
>
> HTH!
>
> ~Aaron
>
> >
> > Regards,
> > Mona
> > _______________________________________________
> > cfe-commits mailing list
> > cfe-commits at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
>
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