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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (STDCXX-597) purify reports uninitialized memory read in _rw_get_char
Date Wed, 13 Feb 2008 17:03:08 GMT

    [ https://issues.apache.org/jira/browse/STDCXX-597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12555420#action_12555420
] 

sebor edited comment on STDCXX-597 at 2/13/08 9:02 AM:
--------------------------------------------------------------

Travis, I get one assertion from 0.char before applying the patch:
{noformat}
# ASSERTION (S7) (3 lines):
# TEXT: rw_printf(">%{/*Gs}<", ...) == ">\"\"<"; got ">(misaligned address
0x000000000042c8a7)<"
# LINE: 1142
{noformat}
and 5 after applying it:
{noformat}
# ASSERTION (S7) (3 lines):
# TEXT: rw_match("\0@0a\0@0b", "ab", 2) == 140733193388034, got 1
# LINE: 819

# ASSERTION (S7) (3 lines):
# TEXT: rw_match("a@0a@1a@2a@3", "a@3a@2a@1a@0", 7) == 140733193388039, got 6
# LINE: 855

# ASSERTION (S7) (3 lines):
# TEXT: rw_match("\0@0a\0@0b", L"ab", 2) == 140733193388034, got 1
# LINE: 970

# ASSERTION (S7) (3 lines):
# TEXT: rw_match("\0@0a\0@0b", "ab", 2) == 140733193388034, got 1
# LINE: 1063

# ASSERTION (S7) (3 lines):
# TEXT: rw_printf(">%{/*Gs}<", ...) == ">\"\"<"; got ">(misaligned address
0x000000000042c8c7)<"
# LINE: 1142
{noformat}

      was (Author: sebor):
    Travis, I get one assertion from 0.char before applying the patch:

# ASSERTION (S7) (3 lines):
# TEXT: rw_printf(">%{/*Gs}<", ...) == ">\"\"<"; got ">(misaligned address
0x000000000042c8a7)<"
# LINE: 1142

and 5 after applying it:

# ASSERTION (S7) (3 lines):
# TEXT: rw_match("\0@0a\0@0b", "ab", 2) == 140733193388034, got 1
# LINE: 819

# ASSERTION (S7) (3 lines):
# TEXT: rw_match("a@0a@1a@2a@3", "a@3a@2a@1a@0", 7) == 140733193388039, got 6
# LINE: 855

# ASSERTION (S7) (3 lines):
# TEXT: rw_match("\0@0a\0@0b", L"ab", 2) == 140733193388034, got 1
# LINE: 970

# ASSERTION (S7) (3 lines):
# TEXT: rw_match("\0@0a\0@0b", "ab", 2) == 140733193388034, got 1
# LINE: 1063

# ASSERTION (S7) (3 lines):
# TEXT: rw_printf(">%{/*Gs}<", ...) == ">\"\"<"; got ">(misaligned address
0x000000000042c8c7)<"
# LINE: 1142

  
> purify reports uninitialized memory read in _rw_get_char 
> ---------------------------------------------------------
>
>                 Key: STDCXX-597
>                 URL: https://issues.apache.org/jira/browse/STDCXX-597
>             Project: C++ Standard Library
>          Issue Type: Improvement
>          Components: Test Driver
>    Affects Versions: 4.2.0
>            Reporter: Travis Vitek
>            Priority: Minor
>             Fix For: 4.2.1
>
>         Attachments: stdcxx-597.patch
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> {noformat}
> ****  Purify instrumented ./21.string.access (pid 2878)  ****
> UMR: Uninitialized memory read:
>   * This is occurring while in thread 2878:
>     _rw_get_char(char const*, char const**, unsigned*) [char.cpp:562]
>     rw_match(char const*, char const*, unsigned) [char.cpp:816]
>      test_access<char, std::char_traits<char>, std::allocator<char> >(char,
std::char_traits<char>*, char*, StringFunc const&, StringTestCase const&) [21.string.access.cpp:274]
>     test_access(StringFunc const&, StringTestCase const&) [21.string.access.cpp:317]
>     _rw_test_case(StringFunc const&, StringTestCase const&,   (*)(StringFunc
const&, StringTestCase const&)) [21.strings.cpp:1298]
>     _rw_run_cases(StringFunc const&, StringTest const&) [21.strings.cpp:1353]
>   * Reading 1 byte from 0x8182256 in the heap.
>   * Address 0x8182256 is 14 bytes into a malloc'd block at 0x8182248 of 46 bytes.
>   * This block was allocated from thread -1207973632:
>     malloc         [rtlib.o]
>     operator new(unsigned) [libstd15d.so]
>     __rw::__rw_allocate(unsigned, int) [memory.cpp:53]
>     std::allocator<char>::allocate(unsigned,  const*) [_allocator.h:144]
>     std::string<char, std::char_traits<char>, std::allocator<char>>::_C_get_rep(unsigned,
unsigned) [string.cc:102]
>     std::string<char, std::char_traits<char>, std::allocator<char>>::string<char,
std::char_traits<char>, std::allocator<char>>[not-in-charge](char const*, unsigned,
std::allocator<char> const&) [string.cc:180]
> ****  Purify instrumented ./21.string.access (pid 2878)  ****
> UMR: Uninitialized memory read:
>   * This is occurring while in thread 2878:
>     _rw_get_char(char const*, char const**, unsigned*) [char.cpp:562]
>     rw_match(char const*, char const*, unsigned) [char.cpp:816]
>      test_access<char, UserTraits<char>, std::allocator<char> >(char,
UserTraits<char>*, char*, StringFunc const&, StringTestCase const&) [21.string.access.cpp:274]
>     test_access(StringFunc const&, StringTestCase const&) [21.string.access.cpp:317]
>     _rw_test_case(StringFunc const&, StringTestCase const&,   (*)(StringFunc
const&, StringTestCase const&)) [21.strings.cpp:1298]
>     _rw_run_cases(StringFunc const&, StringTest const&) [21.strings.cpp:1353]
>   * Reading 1 byte from 0x818d5a6 in the heap.
>   * Address 0x818d5a6 is 14 bytes into a malloc'd block at 0x818d598 of 46 bytes.
>   * This block was allocated from thread -1207973632:
>     malloc         [rtlib.o]
>     operator new(unsigned) [libstd15d.so]
>     __rw::__rw_allocate(unsigned, int) [memory.cpp:53]
>     std::allocator<char>::allocate(unsigned,  const*) [_allocator.h:144]
>     std::basic_string<char, std::char_traits<char>, std::allocator<char>><char,
UserTraits<char>, std::allocator<char> >::_C_get_rep(unsigned, unsigned) [string.cc:102]
>     std::basic_string<char, std::char_traits<char>, std::allocator<char>><char,
UserTraits<char>, std::allocator<char> >::basic_string<char, std::char_traits<char>,
std::allocator<char>>[not-in-charge](char const*, unsigned, std::allocator<char>
const&) [string.cc:180] 
> {noformat}

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