purify reports uninitialized memory read in _rw_get_char

• Key: STDCXX-597
• Type: Improvement
• Status: Open
• Priority: Minor
• Assignee: Unassigned
• Reporter: Travis Vitek
• Component/s: Test Driver
• Affects Version/s: 4.2.0
• Fix Version/s: 4.3.0

Description

****  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]