我正在使用OS X 10.8.5操作系统,通过Homebrew安装了llvm 3.4(clang版本为3.4(tags / RELEASE_34 / final)),并使用-fsanitize = address进行构建。我可以在简单的演示程序中使用asan,但是在针对我们的代码库进行构建时,我遇到了一些问题(尽管我只想得到#1的答案):
第三方库正在生成asan错误,并且asan在第一次发生错误时终止了我的应用程序。我认为会有某种(运行时/编译时)选项告诉asan在找到错误后继续执行。具体来说,我看到了这个:
bash-3.2$ ASAN_SYMBOLIZER_PATH=/usr/local/Cellar/llvm34/3.4/lib/llvm-3.4/bin/llvm-symbolizer ./unit_test
Start testing of PathTrieTest
Config: Using QTest library 4.8.2, Qt 4.8.2
PASS : PathTrieTest::initTestCase()
PASS : PathTrieTest::pathTrieNodeTest()
=================================================================
==76647==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61600019e588 at pc 0x10891ddd3 bp 0x11312ba90 sp 0x11312ba58
WRITE of size 48830 at 0x61600019e588 thread T3
#0 0x10891ddd2 in wrap_readdir_r (/usr/local/lib/llvm-3.4/lib/clang/3.4/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x11dd2)
#1 0x10ac23571 in QFileSystemIterator::advance(QFileSystemEntry&, QFileSystemMetaData&) (/Volumes/ToolChain/qt-4.8/lib/QtCore.framework/Versions/4/QtCore+0xef571)
#2 0x10abd86d3 in QDirIteratorPrivate::advance() (/Volumes/ToolChain/qt-4.8/lib/QtCore.framework/Versions/4/QtCore+0xa46d3)
#3 0x10abd7a7f in QDirIteratorPrivate::QDirIteratorPrivate(QFileSystemEntry const&, QStringList const&, QFlags<QDir::Filter>, QFlags<QDirIterator::IteratorFlag>, bool) (/Volumes/ToolChain/qt-4.8/lib/QtCore.framework/Versions/4/QtCore+0xa3a7f)
#4 0x10abd8b68 in QDirIterator::QDirIterator(QDir const&, QFlags<QDirIterator::IteratorFlag>) (/Volumes/ToolChain/qt-4.8/lib/QtCore.framework/Versions/4/QtCore+0xa4b68)
#5 0x10abd7609 in QDirPrivate::initFileLists(QDir const&) const (/Volumes/ToolChain/qt-4.8/lib/QtCore.framework/Versions/4/QtCore+0xa3609)
#6 0x10abd5394 in QDir::count() const (/Volumes/ToolChain/qt-4.8/lib/QtCore.framework/Versions/4/QtCore+0xa1394)
#7 0x1084c205d in get_count(QFileInfo&) /Users/stebro/dev_vm/ui/ui/fsinfoprovider.cpp:36
...
当程序在未经过净化的情况下运行时,此错误不会导致应用程序终止。
当我使用-fsanitize=undefined(或-fsanitize=address,undefined)选项时,我无法使代码链接起来。 我在编译和链接命令中都包含了-fsanitize=undefined行,但我会收到链接错误,例如:
Undefined symbols for architecture x86_64:
"typeinfo for __cxxabiv1::__class_type_info", referenced from:
__ubsan::checkDynamicType(void*, void*, unsigned long) in libclang_rt.ubsan_osx.a(ubsan_type_hash.o)
isDerivedFromAtOffset(__cxxabiv1::__class_type_info const*, __cxxabiv1::__class_type_info const*, long) in libclang_rt.ubsan_osx.a(ubsan_type_hash.o)
findBaseAtOffset(__cxxabiv1::__class_type_info const*, long) in libclang_rt.ubsan_osx.a(ubsan_type_hash.o)
"typeinfo for __cxxabiv1::__si_class_type_info", referenced from:
isDerivedFromAtOffset(__cxxabiv1::__class_type_info const*, __cxxabiv1::__class_type_info const*, long) in libclang_rt.ubsan_osx.a(ubsan_type_hash.o)
findBaseAtOffset(__cxxabiv1::__class_type_info const*, long) in libclang_rt.ubsan_osx.a(ubsan_type_hash.o)
"typeinfo for __cxxabiv1::__vmi_class_type_info", referenced from:
isDerivedFromAtOffset(__cxxabiv1::__class_type_info const*, __cxxabiv1::__class_type_info const*, long) in libclang_rt.ubsan_osx.a(ubsan_type_hash.o)
findBaseAtOffset(__cxxabiv1::__class_type_info const*, long) in libclang_rt.ubsan_osx.a(ubsan_type_hash.o)
我无法让黑名单起作用,而-mllvm -asan-globals=0或-mllvm -asan-stack=0似乎不像我预期的那样工作。例如,后者不能禁止生成上述#1中列出的错误,并创建类似下面的黑名单也无法抑制错误: fun:QDirPrivate::initFileLists
fun:get_count
fun:*opendir2*
最后,使用这些asan选项生成的可执行文件会导致lldb崩溃。我正在使用XCode 5工具附带的lldb;homebew llvm软件包中没有部署lldb,并且我无法弄清楚如何构建它。构建说明enter link description here有一个指向你应该使用的源代码的失效链接;直接从svn存储库中拉取源代码,使用:
svn co http://llvm.org/svn/llvm-project/lldb/tags/RELEASE_34/final lldb
结果会产生无法编译的代码(可根据请求提供错误信息)。