This is necessary to support the dynamic CRT (/MD) with VS2015. In
VS2015, these symbols are no longer imported from a DLL, they provided
statically by msvcrt.lib. This means our approach of hotpatching the DLL
no longer works.
By exporting the symbols, we end up relying on the same mechanism that
we use to intercept symbols in the static CRT (/MT) case. The ASan
runtime always needs to appear first on the link line, and the linker
searches for symbol definitions from left to right. This means we can
stop hotpatching operator new and delete in the CRT, which is nice.
I think that the only reason we weren't exporting the symbols already is
because MSVC doesn't allow you to do it directly with
__declspec(dllexport). Instead, we can use
`#pragma comment(linker, "/export:foo")`, which is most of what the
attribute does under the hood. It does mean we have to write down the
mangled names of the operators, but that's not too bad.
llvm-svn: 264190
Summary: I've copy/pasted the LLVM_NOEXCEPT definition macro goo from LLVM's Compiler.h. Is there somewhere I should put this in Compiler RT? Is there a useful header to define/share things like this?
Reviewers: samsonov
Differential Revision: http://reviews.llvm.org/D11780
llvm-svn: 244453
MSanDR is a dynamic instrumentation tool that can instrument the code
(prebuilt libraries and such) that could not be instrumented at compile time.
This code is unused (to the best of our knowledge) and unmaintained, and
starting to bit-rot.
llvm-svn: 222232
asan_cxx containts replacements for new/delete operators, and should
only be linked in C++ mode. We plan to start building this part
with exception support to make new more standard-compliant.
See https://code.google.com/p/address-sanitizer/issues/detail?id=295
for more details.
llvm-svn: 208609
New/delete implementations in system libraries almost always are built without
frame pointers. As we switched to frame pointer based unwinder on ARM, they no
longer work for us, resulting in broken allocation/deallocation stacks.
Note that this does not work with statically linked
libstdc++/libc++/libstlport.
llvm-svn: 199872
Because the interceptors will reside in a dylib, not the main executable, we can't just declare them,
but must use the interposition machinery.
Fix the test expectations in large_func_test.cc affected by the change.
This CL should make our Mac buildbots green.
llvm-svn: 175763
Also fix large_func_test.cc, which got broken when we switched to allocator2: the OOB access was too far from the original allocation, so ASan decided to describe the next one.
llvm-svn: 174626
Kostya Serebryany