* dump-translation-unit format
@ 2007-03-08 12:16 Sascha Alexander Jopen
0 siblings, 0 replies; 3+ messages in thread
From: Sascha Alexander Jopen @ 2007-03-08 12:16 UTC (permalink / raw)
To: gcc-help
Hi,
I'm currently working on the output of gcc/g++ -fdump-translation-unit to do
source code analysis. I found several references that the internal ast
should include nodes for for, while and do constructs. But I can't find
those nodes in the dumped files. Sometimes there are such FOR_STMT nodes
when I compile large units, but when compiling a small test unit containing
not much more than a for loop, this loop isn't included in the dump. Instead
there is a GOTO_EXPR where I would expect the for loop. This holds for other
loops and conditional expressions as well. All FOR_STMT nodes I encountered
where not from my custom code, but from templates from system includes.
Are there any optimizations done on the tree before dumping it, and how can
I prevent this to get an unoptimized tree? Are there other possibilities to
get those loop nodes? I need them to check whether function calls are done
in loops or not. Without the bodies of loops I can get information about
functions called from other functions using the chain links, but not whether
they are called within loops.
Another thing I don't understand is the following. This dumped function node
contains two body definitions, one undefined and one with a proper node
chain. Is this a dump error or has it special meaning?
@1639 function_decl name: @2001 mngl: @2002 type: @2003
scpe: @812 srcp: char_traits.h:322
chan: @2004 note: member accs: pub
args: @2005 body: undefined
link: extern body: @2006
Maybe someone could help me or point me to other resources.
Thanks in advance,
Sascha Jopen
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: dump-translation-unit format
2007-03-09 14:14 Sascha Alexander Jopen
@ 2007-03-09 15:43 ` Ian Lance Taylor
0 siblings, 0 replies; 3+ messages in thread
From: Ian Lance Taylor @ 2007-03-09 15:43 UTC (permalink / raw)
To: Sascha Alexander Jopen; +Cc: gcc-help
"Sascha Alexander Jopen" <jopen@gmx.net> writes:
> I'm currently working on the output of gcc/g++ -fdump-translation-unit to do
> source code analysis. I found several references that the internal ast
> should include nodes for for, while and do constructs. But I can't find
> those nodes in the dumped files. Sometimes there are such FOR_STMT nodes
> when I compile large units, but when compiling a small test unit containing
> not much more than a for loop, this loop isn't included in the dump. Instead
> there is a GOTO_EXPR where I would expect the for loop. This holds for other
> loops and conditional expressions as well. All FOR_STMT nodes I encountered
> where not from my custom code, but from templates from system includes.
>
> Are there any optimizations done on the tree before dumping it, and how can
> I prevent this to get an unoptimized tree? Are there other possibilities to
> get those loop nodes? I need them to check whether function calls are done
> in loops or not. Without the bodies of loops I can get information about
> functions called from other functions using the chain links, but not whether
> they are called within loops.
Which version of gcc are you using? In mainline
-fdump-translation-unit just dumps the global declarations. If you
want to see FOR_STMT nodes, you need -fdump-tree-original. But that
is pretty unsatisfactory these days since for_stmt nodes are not
dumped in a useful way. And that only happens for C++; for C FOR_STMT
nodes are never generated.
> Another thing I don't understand is the following. This dumped function node
> contains two body definitions, one undefined and one with a proper node
> chain. Is this a dump error or has it special meaning?
>
> @1639 function_decl name: @2001 mngl: @2002 type: @2003
> scpe: @812 srcp: char_traits.h:322
> chan: @2004 note: member accs: pub
> args: @2005 body: undefined
> link: extern body: @2006
>
> Maybe someone could help me or point me to other resources.
The tree dump code prints out "body: undefined" for an external
function which is not to be compiled by itself. But such a function
can still have a body; this will be the case for a C++ inline
function. This is somewhat confusing.
Ian
^ permalink raw reply [flat|nested] 3+ messages in thread
* dump-translation-unit format
@ 2007-03-09 14:14 Sascha Alexander Jopen
2007-03-09 15:43 ` Ian Lance Taylor
0 siblings, 1 reply; 3+ messages in thread
From: Sascha Alexander Jopen @ 2007-03-09 14:14 UTC (permalink / raw)
To: gcc-help
Hi,
I'm currently working on the output of gcc/g++ -fdump-translation-unit to do
source code analysis. I found several references that the internal ast
should include nodes for for, while and do constructs. But I can't find
those nodes in the dumped files. Sometimes there are such FOR_STMT nodes
when I compile large units, but when compiling a small test unit containing
not much more than a for loop, this loop isn't included in the dump. Instead
there is a GOTO_EXPR where I would expect the for loop. This holds for other
loops and conditional expressions as well. All FOR_STMT nodes I encountered
where not from my custom code, but from templates from system includes.
Are there any optimizations done on the tree before dumping it, and how can
I prevent this to get an unoptimized tree? Are there other possibilities to
get those loop nodes? I need them to check whether function calls are done
in loops or not. Without the bodies of loops I can get information about
functions called from other functions using the chain links, but not whether
they are called within loops.
Another thing I don't understand is the following. This dumped function node
contains two body definitions, one undefined and one with a proper node
chain. Is this a dump error or has it special meaning?
@1639 function_decl name: @2001 mngl: @2002 type: @2003
scpe: @812 srcp: char_traits.h:322
chan: @2004 note: member accs: pub
args: @2005 body: undefined
link: extern body: @2006
Maybe someone could help me or point me to other resources.
Thanks in advance,
Sascha Jopen
^ permalink raw reply [flat|nested] 3+ messages in thread
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