Modified patch by Adam Preuss.

This builds on the existing framework for block tracing, edge profiling and optimal edge profiling.
See -help-hidden for new flags.
For documentation, see the technical report "Implementation of Path Profiling..." in llvm.org/pubs.

llvm-svn: 124515

Makefile.rules assumes that all EXPORTED_SYMBOL_FILEs have the .exports
extension.

llvm-svn: 112964

llvm-svn: 101459

to expect them this way, to fix srcdir!=objdir builds.

llvm-svn: 101414

system.

llvm-svn: 101404

llvm-svn: 101387

variable TARGET_HAS_DYNAMIC_LIBS

llvm-svn: 100896

llvm-svn: 100895

llvm-svn: 97882

llvm-svn: 97772

llvm-svn: 96936

If there is interest, it can be resurrected from SVN.  PR4912.

llvm-svn: 92422

This adds the instrumentation and runtime part of OptimalEdgeProfiling.

llvm-svn: 80712

See http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20090824/085828.html

llvm-svn: 80372

llvm-svn: 80331

llvm-svn: 80330

llvm-svn: 80303

llvm-svn: 79944

llvm-svn: 79514

that is totally bogus.

llvm-svn: 79512

llvm-svn: 65801

llvm-svn: 46302

ShadowStackCollector, which additionally has reduced overhead with
no sacrifice in portability.

Considering a function @fun with 8 loop-local roots,
ShadowStackCollector introduces the following overhead
(x86):

; shadowstack prologue
        movl    L_llvm_gc_root_chain$non_lazy_ptr, %eax
        movl    (%eax), %ecx
        movl    $___gc_fun, 20(%esp)
        movl    $0, 24(%esp)
        movl    $0, 28(%esp)
        movl    $0, 32(%esp)
        movl    $0, 36(%esp)
        movl    $0, 40(%esp)
        movl    $0, 44(%esp)
        movl    $0, 48(%esp)
        movl    $0, 52(%esp)
        movl    %ecx, 16(%esp)
        leal    16(%esp), %ecx
        movl    %ecx, (%eax)

; shadowstack loop overhead
        (none)

; shadowstack epilogue
        movl    48(%esp), %edx
        movl    %edx, (%ecx)

; shadowstack metadata
        .align  3
___gc_fun:                              # __gc_fun
        .long   8
        .space  4

In comparison to LowerGC:

; lowergc prologue
        movl    L_llvm_gc_root_chain$non_lazy_ptr, %eax
        movl    (%eax), %ecx
        movl    %ecx, 48(%esp)
        movl    $8, 52(%esp)
        movl    $0, 60(%esp)
        movl    $0, 56(%esp)
        movl    $0, 68(%esp)
        movl    $0, 64(%esp)
        movl    $0, 76(%esp)
        movl    $0, 72(%esp)
        movl    $0, 84(%esp)
        movl    $0, 80(%esp)
        movl    $0, 92(%esp)
        movl    $0, 88(%esp)
        movl    $0, 100(%esp)
        movl    $0, 96(%esp)
        movl    $0, 108(%esp)
        movl    $0, 104(%esp)
        movl    $0, 116(%esp)
        movl    $0, 112(%esp)

; lowergc loop overhead
        leal    44(%esp), %eax
        movl    %eax, 56(%esp)
        leal    40(%esp), %eax
        movl    %eax, 64(%esp)
        leal    36(%esp), %eax
        movl    %eax, 72(%esp)
        leal    32(%esp), %eax
        movl    %eax, 80(%esp)
        leal    28(%esp), %eax
        movl    %eax, 88(%esp)
        leal    24(%esp), %eax
        movl    %eax, 96(%esp)
        leal    20(%esp), %eax
        movl    %eax, 104(%esp)
        leal    16(%esp), %eax
        movl    %eax, 112(%esp)

; lowergc epilogue
        movl    48(%esp), %edx
        movl    %edx, (%ecx)

; lowergc metadata
        (none)

llvm-svn: 45670

llvm-svn: 45425

llvm-svn: 45416

capabilities. This is a major rewrite and is easier to read en toto
rather than patchwise.

llvm-svn: 42414

llvm-svn: 41851

llvm-svn: 41850

Dror GCCLibraries: they are obsolete since 2.0 release. This also reduces number of licenses used in LLVM.

llvm-svn: 41257

llvm-svn: 34529

llvm-svn: 32999

premature, these libraries will be going away for the 2.0 release. Other
arrangements for profiling, gc, etc. should be made in the next few months.

llvm-svn: 31807

be dropped. This patch pertains to removing the runtime directory from LLVM.

llvm-svn: 31793

llvm-svn: 31404

Turn on -Wunused and -Wno-unused-parameter. Clean up most of the resulting
fall out by removing unused variables. Remaining warnings have to do with
unused functions (I didn't want to delete code without review) and unused
variables in generated code. Maintainers should clean up the remaining
issues when they see them. All changes pass DejaGnu tests and Olden.

llvm-svn: 31380

llvm-svn: 29569

llvm-svn: 29568

llvm-svn: 29388

included in the distribution.
Also added the glibc LICENSES file, which should be included as well.

llvm-svn: 29386

Turn -pedantic and -Wno-long-long compile flags on by default. In a few
places, avoid the warnings by removing these options in the local makefile.
One notable exception: lib/Target/CBackend/Writer.cpp. These warnings are
left on as a reminder to developers to clean them up.

llvm-svn: 28614