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233 Commits

Author SHA1 Message Date
Gordon Henriksen 520981b62f Fixing the stack walker. 
llvm-svn: 46302
 2008-01-24 05:16:36 +00:00
Gordon Henriksen 6047b6e140 With this patch, the LowerGC transformation becomes the 
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
 2008-01-07 01:30:53 +00:00
Chris Lattner 6787a45a65 remove attribution from a variety of miscellaneous files. 
llvm-svn: 45425
 2007-12-29 22:59:10 +00:00
Chris Lattner 11cc8b3c14 remove attributions from the rest of the llvm makefiles. 
llvm-svn: 45416
 2007-12-29 20:11:13 +00:00
Gordon Henriksen 0076a6727e GarbageCollection.html is expanded to encompass the coming 
capabilities. This is a major rewrite and is easier to read en toto
rather than patchwise.

llvm-svn: 42414
 2007-09-27 19:31:36 +00:00
Chris Lattner 69c1b10993 Reenable libgc and libprofile is explicitly requested. 
llvm-svn: 41851
 2007-09-11 17:12:32 +00:00
Chris Lattner e09791c399 remove an obsolete library. 
llvm-svn: 41850
 2007-09-11 17:10:52 +00:00
Anton Korobeynikov 3fc4a9f78a Dror GCCLibraries: they are obsolete since 2.0 release. This also reduces number of licenses used in LLVM. 
llvm-svn: 41257
 2007-08-21 22:40:44 +00:00
Chris Lattner d3c36c9641 crtend is only for llvm-gcc3, remove it. 
llvm-svn: 34529
 2007-02-23 19:34:09 +00:00
Chris Lattner 47d012e1c0 the old trace values pass has been removed, remove its runtime library. 
llvm-svn: 32999
 2007-01-07 18:13:48 +00:00
Reid Spencer 4b8067f37b Undo removal of the runtime libraries. While this may have been a bit 
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
 2006-11-17 03:32:33 +00:00
Reid Spencer 3f97d03f86 In LLVM 2.0 we won't use the runtime libraries as llvm-gcc3 support will 
be dropped. This patch pertains to removing the runtime directory from LLVM.

llvm-svn: 31793
 2006-11-16 23:17:27 +00:00
Reid Spencer 3056ebeb22 Remove unused variable. 
llvm-svn: 31404
 2006-11-03 01:58:30 +00:00
Reid Spencer de46e48420 For PR786: 
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
 2006-11-02 20:25:50 +00:00
John Criswell e6330aeb36 Describe and date modifications we made per LGPL requirements. 
llvm-svn: 29569
 2006-08-08 14:47:54 +00:00
John Criswell 05de6a9297 Make information more complete. 
llvm-svn: 29568
 2006-08-08 14:47:33 +00:00
John Criswell 6878ce38aa Reverted previous commit. Thanks, Chris. 
llvm-svn: 29388
 2006-07-28 18:30:52 +00:00
John Criswell 4e31ae8611 Added in the LGPL text and copyright information. This needs to be 
included in the distribution.
Also added the glibc LICENSES file, which should be included as well.

llvm-svn: 29386
 2006-07-28 18:16:00 +00:00
Reid Spencer a62f097c96 For PR786: 
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
 2006-06-01 01:55:21 +00:00
Reid Spencer 54d1f85b19 Put an innocuous statement in this file to quelch warnings about compiling 
an empty file.

llvm-svn: 28612
 2006-06-01 01:49:08 +00:00
Reid Spencer a647c7ff42 Use archive libraries instead of object files for VMCore, BCReader, 
BCWriter, and bzip2 libraries. Adjust the various makefiles to accommodate
these changes. This was done to speed up link times.

llvm-svn: 28610
 2006-06-01 01:30:27 +00:00
Reid Spencer 6e64180f03 For PR786: 
Minor tweaks in public headers and a few .cpp files so that LLVM can build
successfully with -pedantic and projects using LLVM with -pedantic don't
get warnings from LLVM. There's still more -pedantic warnings to fix.

llvm-svn: 28453
 2006-05-24 19:21:13 +00:00
Reid Spencer 4873c79e41 Invert the tests on LLVMGCC_MAJVERS to check for value 4 instead of value 
3. This ensures that if llvm-gcc isn't available and consequently the value
of LLVMGCC_MAJVERS is blank, that the old (include runtime) behavior will
persist.

llvm-svn: 27499
 2006-04-07 21:45:23 +00:00
Chris Lattner 292574fbbc add a newline at the end of the file 
llvm-svn: 27492
 2006-04-07 18:41:16 +00:00
Reid Spencer aed84e46fc Avoid building the runtime libraries if llvm-gcc version 4 is detected. 
llvm-svn: 27464
 2006-04-06 22:15:51 +00:00
Reid Spencer 11dd4b9d9c For PR722: 
Change the check for llvm-gcc from using LLVMGCCDIR to LLVMGCC. This checks
for the actual tool rather than the directory in which the tool resides. In
the case of this bug, it is possible that the directory exists but that the
tools in that directory do not. This fix should avoid the makefile from
erroneously proceeding without the actual tools being available.

llvm-svn: 27361
 2006-04-02 14:34:26 +00:00
Evan Cheng 08b0747be9 Optimizing to calloc() to malloc() + memset() can be bad on some platforms. 
llvm-svn: 26732
 2006-03-13 21:22:43 +00:00
Chris Lattner c683a7232b Make the new and old front-ends more similar: now neither uses __main. 
llvm-svn: 26629
 2006-03-09 06:16:28 +00:00
Chris Lattner 87b2c97251 fix make install/uninstall of libcrtend. 
llvm-svn: 25796
 2006-01-30 02:03:56 +00:00
Chris Lattner 4c251f89b4 Remove out of date comment 
llvm-svn: 25705
 2006-01-27 22:06:50 +00:00
Chris Lattner a4575c7349 Remove the only use of FAKE_SOURCES 
llvm-svn: 25704
 2006-01-27 22:06:23 +00:00
John Criswell 62ef23839c Add the remove() function from the C library. 
llvm-svn: 24498
 2005-11-28 15:49:15 +00:00
Chris Lattner 13a57822a1 This was never updated for the project makefile changes 
llvm-svn: 23790
 2005-10-18 18:50:26 +00:00
Chris Lattner 46a97ab3e8 This never got updated to reflect the project makefile changes 
llvm-svn: 23789
 2005-10-18 18:48:30 +00:00
Misha Brukman b1c9317bb4 Remove trailing whitespace 
llvm-svn: 21427
 2005-04-21 23:48:37 +00:00
Misha Brukman 9c64d9c2b5 Fix grammar 
llvm-svn: 20789
 2005-03-23 21:14:33 +00:00
Chris Lattner cd96168c95 Hrm, who knows what 'uint' is, but it seems to work sometimes? Wierd. 
llvm-svn: 19876
 2005-01-28 19:37:35 +00:00
Reid Spencer 152733823e Turn on LOADABLE_MODULE so that profile.so can be loaded dynamically by 
the JIT.

llvm-svn: 19524
 2005-01-13 16:53:05 +00:00
Reid Spencer 9df352d469 Re-enable libprofile now that llvm-ar is working better. 
llvm-svn: 19523
 2005-01-13 16:51:19 +00:00
Chris Lattner 73bb15ed9a Remove dead directories 
llvm-svn: 19262
 2005-01-02 22:55:16 +00:00
Chris Lattner 373f7faeca This lib is dead 
llvm-svn: 19261
 2005-01-02 22:53:52 +00:00
Chris Lattner 196715cfb4 Remove a bunch of useless empty libraries 
llvm-svn: 19260
 2005-01-02 22:52:28 +00:00
Chris Lattner bb2840b272 This is no longer needed. 
llvm-svn: 19259
 2005-01-02 22:50:00 +00:00
Reid Spencer e301401118 For PR432: 
* Variable name change: cferuntime_libdir -> CFERuntimeLibDir

llvm-svn: 19096
 2004-12-22 05:57:33 +00:00
Chris Lattner 5b489416c9 Disable libprofile as llvm-ar bus errors on it, and I don't want to break 
the nightly testers.

llvm-svn: 18960
 2004-12-15 08:15:48 +00:00
Reid Spencer c6de5b56a3 Use the new BYTECODE_DESTINATION to override the default bytecode install 
destination for this library so that it goes to $(cferuntime_libdir) rather
than just $(libdir). Normal bytecode libraries should be installed in the
$(libdir), but these ones are "special" because they're part of the the
C/C++ front end.

llvm-svn: 18882
 2004-12-13 07:40:50 +00:00
Reid Spencer 6838b3c245 Remove useless -L switch now that gccld -link-as-library bug is fixed. 
llvm-svn: 18613
 2004-12-08 04:22:47 +00:00
Reid Spencer 9f1cf33a54 Make use of the LLVMGCCStdCXXLibDir variable to link objects 
llvm-svn: 18548
 2004-12-05 19:15:06 +00:00
Reid Spencer 895ad73daa Use the FAKE_SOURCES feature for proper distribution of contents 
llvm-svn: 18506
 2004-12-04 22:34:33 +00:00
Reid Spencer 53c59689d1 Standardize the makefiles with space around = to match the rest of LLVM. 
llvm-svn: 18429
 2004-12-02 09:58:09 +00:00