New submission from STINNER Victor <victor.stin...@haypocalc.com>:

If convertitem() result is not NULL, an error occured and seterror() is called 
(by the function calling convertitem()). seterror() does nothing if an 
exception was raised (if PyErr_Occurred() is non zero).

convertitem() doesn't need to call converterr() if an exception occurred 
because the string formatted by converterr() will be ignored. We just need to 
return a non NULL pointer: msgbuf.

Attached patch creates a RETURN_ERR_OCCURRED macro. convertsimple() should be a 
little bit faster and the code is more readable. Details:
 - addcleanup() now takes a boolean to indicate if it's a buffer or a pointer 
to simplify the API and have to raise a special error if the destructor is 
unknown
 - don't check that the result of PyUnicode_AsEncodedString() is a bytes 
object: PyUnicode_AsEncodedString() does already check that

----------
components: Interpreter Core
files: getarg_err_occurred.patch
keywords: patch
messages: 107753
nosy: haypo
priority: normal
severity: normal
status: open
title: convertsimple() doesn't need to call converterr() if an exception was 
already raised
versions: Python 3.2
Added file: http://bugs.python.org/file17662/getarg_err_occurred.patch

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue8992>
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