From now on we allow the clients to override signal handlers set by ASan, but print a warning in such a case.

Remove the tests for signal() and sigaction(), because they made little sense even without this change.

llvm-svn: 154390

[ASan] remove dispatch.h header once again - it's not present on Leopard, and we don't want to break the build of compiler-rt there. See https://trac.macports.org/ticket/33362

llvm-svn: 154326

llvm-svn: 154314

llvm-svn: 154203

llvm-svn: 154201

llvm-svn: 154167

llvm-svn: 154159

llvm-svn: 154112

llvm-svn: 154111

llvm-svn: 154106

llvm-svn: 154097

per-thread stacks for signal handling. This allows to print more verbose error reports
for stack overflows.

llvm-svn: 154092

llvm-svn: 154091

Some high-level notes:

1) An explicit goal is to support building compiler-rt as a subproject
   build, checked out into the projects/compiler-rt directory. There are
   many other possible ways of building the code here, but this is
   optimized for development on LLVM/Clang/compiler-rt, and incremental
   trial and testing of the toolchain.
2) The current support is targeted at Linux. I would love to see this
   generalized to other platforms, but for the sake of simplicity in
   testing, I'm focusing here first.

Much of this patch was paired with Manuel, and I credit him with the
majority of the work here.

Some important caveats that I'll be working on in subsequent patches:

1) This uses the host compiler rather than using the just-built-clang.
2) Currently only x86 is supported.
3) Currently, none of the tests are built or run.
4) Uses CMake's builtin globbing which doesn't update correctly.
5) This is still turned off from LLVM's CMake build until these issues
   are addressed

llvm-svn: 154060

llvm-svn: 154006

llvm-svn: 153762

llvm-svn: 153641

llvm-svn: 153637

llvm-svn: 153601

llvm-svn: 153586

llvm-svn: 153514

llvm-svn: 153444

It's not available on Android. We only use this header to find out if _DYNAMIC
is present; declaring it "extern void*" does the trick.

llvm-svn: 153431

llvm-svn: 153430

llvm-svn: 153379

llvm-svn: 153378

llvm-svn: 153377

llvm-svn: 153376

llvm-svn: 153333

llvm-svn: 153332

llvm-svn: 153327

After the instructions are moved to the branch island, fixupInstructions() expands every 2-byte ja/je instruction with a 1-byte offset into a 6-byte ja/je with 32-bit offset. The offset is fixed to point to the original function.

llvm-svn: 153249

llvm-svn: 153190

llvm-svn: 153188

llvm-svn: 153187

llvm-svn: 153186

llvm-svn: 153183

llvm-svn: 153182

llvm-svn: 153180

llvm-svn: 153179