[asan] workaround for bug http://llvm.org/bugs/show_bug.cgi?id=11763. Do not bark on memcpy(a, a, size).

llvm-svn: 148318

llvm-svn: 148311

llvm-svn: 148305

AddressSanitizer: from this patch, ASan allocator returns false for __asan_get_ownership(NULL) and produce error reports for malloc_usable_size(NULL) and __asan_get_allocated_size(NULL)

llvm-svn: 148304

llvm-svn: 148303

llvm-svn: 148287

llvm-svn: 148286

llvm-svn: 148236

llvm-svn: 148235

llvm-svn: 148234

and switches our interceptors to using them instead of the default
vm_allocate-based approach used by mach_override_ptr.

To simplify the code, a fixed memory mapping is used for the allocation pool --
note that we can't mmap an arbitrary chunk of memory, because the shadow memory hasn't been mapped yet
(for the reasons discussed in http://code.google.com/p/address-sanitizer/issues/detail?id=24, we cannot map the shadow earlier)

The patch drops the program startup time from several second to half a second,
which speeds up the execution of ASan tests noticeably.
Because of the virtual memory size occupied by the programs it's hard
to speed up the shutdown time, which would've also helped the tests.

llvm-svn: 148116

Add __asan_mach_override_ptr_custom, which allows to inject a custom memory allocator into mach_override_ptr().

llvm-svn: 148115

in asan_linux.cc, because /proc is unavailable on Mac.
Instead the Mac version of AsanGetEnv iterates over the array of
environment variables obtained from _NSGetEnviron()

llvm-svn: 148114

Patch by Ruben Van Boxem! 

llvm-svn: 148048

Protected by an #ifdef, disabled by default.

llvm-svn: 147932

llvm-svn: 147930

llvm-svn: 147919

llvm-svn: 147916

llvm-svn: 147913

[asan] get rid of the scary TSD destructor code. Now, we store the leaky AsanThreadSummary in TSD and never remove it from there.

llvm-svn: 147910

llvm-svn: 147896

llvm-svn: 147878

llvm-svn: 147811

[asan] temporary reinstate string.h/strings.h. Removal of those caused a Mac build failulre which I failed to observe before the commit

llvm-svn: 147810

llvm-svn: 147809

llvm-svn: 147807

llvm-svn: 147796

llvm-svn: 147793

llvm-svn: 147792

llvm-svn: 147788

llvm-svn: 147784

llvm-svn: 147674

llvm-svn: 147671

llvm-svn: 147665

llvm-svn: 147647

llvm-svn: 147632

llvm-svn: 147628

[asan] move {linux,mac}-specific code from asan_thread.cc to asan_{linux,mac}.cc; also add asan_procmaps.h which I forgot to add on previous commit.

llvm-svn: 147586

llvm-svn: 147581

llvm-svn: 147514