cannot attach attributes to nodes of type '<class 'pycparser.c_ast.PtrDecl'>' #68

h4ck3rm1k3 · 2016-04-02T12:29:37Z

h4ck3rm1k3
Apr 2, 2016

typedef int wchar_t;
extern wchar_t *wcscpy (wchar_t **restrict __dest,
const wchar_t __restrict __src) __attribute ((nothrow , leaf));

python example.py test1.c
WARNING: /usr/lib/python2.7/dist-packages/pycparser/plyparser.py:41: Rule 'initializer_list_opt' defined, but not used
WARNING: There is 1 unused rule
WARNING: Symbol 'initializer_list_opt' is unreachable
Traceback (most recent call last):
  File "example.py", line 12, in <module>
    ast = p.parse(text)
  File "/home/jamesmikedupont/py/pycparserext/pycparserext/ext_c_parser.py", line 64, in parse
    return self.cparser.parse(text, lexer=self.clex, debug=debuglevel)
  File "/usr/lib/python2.7/dist-packages/ply/yacc.py", line 269, in parse
    return self.parseopt_notrack(input,lexer,debug,tracking,tokenfunc)
  File "/usr/lib/python2.7/dist-packages/ply/yacc.py", line 975, in parseopt_notrack
    p.callable(pslice)
  File "/home/jamesmikedupont/py/pycparserext/pycparserext/ext_c_parser.py", line 282, in p_declarator_2
    % type(p[1]))
NotImplementedError: cannot attach attributes to nodes of type '<class 'pycparser.c_ast.PtrDecl'>'

inducer · 2016-04-02T15:49:58Z

inducer
Apr 2, 2016
Maintainer

Did you try this with the git version? @vijunag contributed code recently that might do what you want. At any rate, I've gone ahead and released 2016.1. Let me know if that fixes your issue.

0 replies

h4ck3rm1k3 · 2016-04-02T18:05:46Z

h4ck3rm1k3
Apr 2, 2016
Author

this is git master latest .

On Sat, Apr 2, 2016 at 11:49 AM, Andreas Klöckner notifications@github.com
wrote:

Did you try this with the git version? @vijunag
https://github.com/vijunag contributed code recently that might do what
you want. At any rate, I've gone ahead and released 2016.1. Let me know if
that fixes your issue.

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You are receiving this because you authored the thread.
Reply to this email directly or view it on GitHub
#17 (comment)

James Michael DuPont
Kansas Linux Fest http://kansaslinuxfest.us
Free/Libre Open Source and Open Knowledge Association of Kansas
http://openkansas.us
Member of Free Libre Open Source Software Kosova http://www.flossk.org
Saving Wikipedia(tm) articles from deletion http://SpeedyDeletion.wikia.com

0 replies

inducer · 2016-04-02T19:52:58Z

inducer
Apr 2, 2016
Maintainer

Thanks for the report. I'd be happy to consider a patch.

0 replies

vijunag · 2016-04-03T05:01:10Z

vijunag
Apr 3, 2016

Python 2.7.10 (default, Jul  5 2015, 14:15:43)
[GCC 5.1.1 20150618 (Red Hat 5.1.1-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from pycparserext.ext_c_parser import GnuCParser
>>> p = GnuCParser()
>>> src="""
... typedef int wchar_t;
... extern wchar_t *wcscpy (wchar_t *restrict __dest,
... const wchar_t *__restrict __src) __attribute ((nothrow , leaf));
...
... """
>>> p.parse(src).show()
FileAST:
  Typedef: wchar_t, [], ['typedef']
    TypeDecl: wchar_t, []
      IdentifierType: ['int']
  Decl: wcscpy, [], ['extern'], []
    FuncDecl:
      ParamList:
        Decl: __dest, [], [], []
          TypeDeclExt: __dest, []
            IdentifierType: ['wchar_t']
        Decl: __src, ['const'], [], []
          TypeDeclExt: __src, ['const']
            IdentifierType: ['wchar_t']
      PtrDecl: []
        TypeDeclExt: wcscpy, []
          IdentifierType: ['wchar_t']
>>> exit()
localhost:~/clone3/pycparserext]$ git log
commit a5d7ef695aed6400fb1cacdfb40faea809d084e5
Author: Vijay Nag <vijay@localhost.localdomain>
Date:   Thu Mar 24 17:09:58 2016 +0530

    Added support for empty GNU structures

The latest master seems to be working fine for me.

0 replies

vijunag · 2016-04-03T05:19:51Z

vijunag
Apr 3, 2016

@inducer He doesn't seem to be having my patch looks like since the code at the backtrace is at a different line.

File "/home/jamesmikedupont/py/pycparserext/pycparserext/ext_c_parser.py", line 282, in p_declarator_2
% type(p[1]))
NotImplementedError: cannot attach attributes to nodes of type '<class 'pycparser.c_ast.PtrDecl'>'

0 replies

h4ck3rm1k3 · 2016-04-03T05:25:04Z

h4ck3rm1k3
Apr 3, 2016
Author

I just checked all the versions. my branch is up to date with my tests.
But look, I am on the latest version of ply and of the pycparser maybe that causes a problem.

it says
WARNING: /usr/lib/python2.7/dist-packages/pycparser/plyparser.py:41: Rule 'initializer_list_opt' defined, but not used
WARNING: There is 1 unused rule
WARNING: Symbol 'initializer_list_opt' is unreachable

ply$ git log -1
commit d776a2ece6c12bf8f8b6a0e65b48546ac6078765
Author: David Beazley dave@dabeaz.com
Date: Fri Oct 2 13:07:25 2015 -0500

Bumped version number

pycparser$ git log -1
commit 843362984323854f2ee81b529faa20e148915481
Author: Eli Bendersky eliben@gmail.com
Date: Sat Mar 19 05:48:10 2016 -0700

jamesmikedupont@instance-3:~/py/pycparserext$ python test.py

WARNING: /usr/lib/python2.7/dist-packages/pycparser/plyparser.py:41: Rule 'initializer_list_opt' defined, but not used
WARNING: There is 1 unused rule
WARNING: Symbol 'initializer_list_opt' is unreachable
Traceback (most recent call last):
  File "test.py", line 9, in <module>
    p.parse(src).show()
  File "/home/jamesmikedupont/py/pycparserext/pycparserext/ext_c_parser.py", line 64, in parse
    return self.cparser.parse(text, lexer=self.clex, debug=debuglevel)
  File "/usr/lib/python2.7/dist-packages/ply/yacc.py", line 269, in parse
    return self.parseopt_notrack(input,lexer,debug,tracking,tokenfunc)
  File "/usr/lib/python2.7/dist-packages/ply/yacc.py", line 975, in parseopt_notrack
    p.callable(pslice)
  File "/home/jamesmikedupont/py/pycparserext/pycparserext/ext_c_parser.py", line 279, in p_declarator_2
    % type(p[1]))
NotImplementedError: cannot attach attributes to nodes of type '<class 'pycparser.c_ast.PtrDecl'>'

0 replies

vijunag · 2016-04-03T05:35:35Z

vijunag
Apr 3, 2016

Interesting. I just did a clone of latest pycparser and below are the yacc_debug logs and I didn't notice any "unreachable production error"

p = GnuCParser(yacc_debug=1)
Generating LALR tables
WARNING: 87 shift/reduce conflicts
WARNING: 88 reduce/reduce conflicts
WARNING: reduce/reduce conflict in state 295 resolved using rule (direct_declarator -> direct_declarator LPAREN identifier_list_opt RPAREN)
WARNING: rejected rule (empty -> ) in state 295
WARNING: reduce/reduce conflict in state 296 resolved using rule (direct_declarator -> direct_declarator LPAREN parameter_type_list RPAREN)
WARNING: rejected rule (empty -> ) in state 296
WARNING: reduce/reduce conflict in state 341 resolved using rule (primary_expression -> gnu_statement_expression)
WARNING: rejected rule (statement -> gnu_statement_expression) in state 341

Also, I suggest you to use the ply/lex tha came along with cparser.

 cat pycparserext/ext_c_parser.py
from __future__ import division

import pycparser.c_parser
import pycparser.c_ast as c_ast
try:
    import pycparser.ply.yacc as yacc # use this version of ply
except ImportError:
    import ply.yacc as yacc

0 replies

h4ck3rm1k3 · 2016-04-03T06:12:22Z

h4ck3rm1k3
Apr 3, 2016
Author

On Sun, Apr 3, 2016 at 1:35 AM, vijunag notifications@github.com wrote:

from future import division import pycparser.c_parser import
pycparser.c_ast as c_ast try: import pycparser.ply.yacc as yacc # use this
version of ply except ImportError: import ply.yacc as yacc

Hi, I dont need this right now, I am reporting what I found. Please give it
a try. I will circle back to this in a while.

James Michael DuPont
Kansas Linux Fest http://kansaslinuxfest.us
Free/Libre Open Source and Open Knowledge Association of Kansas
http://openkansas.us
Member of Free Libre Open Source Software Kosova http://www.flossk.org
Saving Wikipedia(tm) articles from deletion http://SpeedyDeletion.wikia.com

0 replies

vijunag · 2016-04-03T07:40:58Z

vijunag
Apr 3, 2016

Cool. Thanks much for the report anyway.

0 replies

MaggieCwj · 2022-05-09T06:49:23Z

MaggieCwj
May 9, 2022

On Sun, Apr 3, 2016 at 1:35 AM, vijunag notifications@github.com wrote:

from future import division import pycparser.c_parser import
pycparser.c_ast as c_ast try: import pycparser.ply.yacc as yacc # use this
version of ply except ImportError: import ply.yacc as yacc

Hi, I dont need this right now, I am reporting what I found. Please give it a try. I will circle back to this in a while.

James Michael DuPont Kansas Linux Fest http://kansaslinuxfest.us Free/Libre Open Source and Open Knowledge Association of Kansas http://openkansas.us Member of Free Libre Open Source Software Kosova http://www.flossk.org Saving Wikipedia(tm) articles from deletion http://SpeedyDeletion.wikia.com

May I know how you solve this problem? thank u

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cannot attach attributes to nodes of type '<class 'pycparser.c_ast.PtrDecl'>' #68

h4ck3rm1k3 Apr 2, 2016

Replies: 10 comments

inducer Apr 2, 2016 Maintainer

h4ck3rm1k3 Apr 2, 2016 Author

inducer Apr 2, 2016 Maintainer

vijunag Apr 3, 2016

vijunag Apr 3, 2016

h4ck3rm1k3 Apr 3, 2016 Author

vijunag Apr 3, 2016

h4ck3rm1k3 Apr 3, 2016 Author

vijunag Apr 3, 2016

MaggieCwj May 9, 2022

h4ck3rm1k3
Apr 2, 2016

inducer
Apr 2, 2016
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h4ck3rm1k3
Apr 2, 2016
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inducer
Apr 2, 2016
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vijunag
Apr 3, 2016

vijunag
Apr 3, 2016

h4ck3rm1k3
Apr 3, 2016
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vijunag
Apr 3, 2016

h4ck3rm1k3
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vijunag
Apr 3, 2016

MaggieCwj
May 9, 2022