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27 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
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 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
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
Reid Spencer e301401118 For PR432: 
* Variable name change: cferuntime_libdir -> CFERuntimeLibDir

llvm-svn: 19096
 2004-12-22 05:57:33 +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 53c59689d1 Standardize the makefiles with space around = to match the rest of LLVM. 
llvm-svn: 18429
 2004-12-02 09:58:09 +00:00
Reid Spencer aa4887b482 Add EXTRA_DIST for additional files to be distributed. 
llvm-svn: 17233
 2004-10-26 03:12:11 +00:00
Reid Spencer 5fd95ce095 We're not doing automake any more 
llvm-svn: 17168
 2004-10-22 21:02:23 +00:00
Reid Spencer 30d8baea8d Adjust to changes in Makefile.rules 
llvm-svn: 17167
 2004-10-22 21:02:08 +00:00
Reid Spencer c1c320c335 We won't use automake 
llvm-svn: 17155
 2004-10-22 03:35:04 +00:00
Reid Spencer 6a11a75f31 Initial automake generated Makefile template 
llvm-svn: 17136
 2004-10-18 23:55:41 +00:00
Reid Spencer 94ffa656eb Initial Makefile.am for building with automake 
llvm-svn: 17073
 2004-10-17 00:24:24 +00:00
Misha Brukman 976381e554 Do not mention Chris in public Makefiles 
llvm-svn: 15591
 2004-08-09 20:23:44 +00:00
Chris Lattner 51f7c9e56d Update GC intrinsics to take a pointer to the object as well as a pointer 
to the field being updated.  Patch contributed by Tobias Nurmiranta

llvm-svn: 15097
 2004-07-22 05:51:13 +00:00
Brian Gaeke 9905a2eb63 Fix warning on 64-bit machines 
llvm-svn: 14902
 2004-07-16 21:40:32 +00:00
Chris Lattner c2ee70db2d Continue the implementation 
llvm-svn: 13818
 2004-05-27 05:51:31 +00:00
Chris Lattner f74b2868c8 A few more microsteps 
llvm-svn: 13817
 2004-05-27 05:51:13 +00:00
Alkis Evlogimenos 4da5264253 Eliminate warnings 
llvm-svn: 13704
 2004-05-23 23:02:35 +00:00
Chris Lattner 9656fe9cdc Initial checkin of GC implementation support files 
llvm-svn: 13700
 2004-05-23 21:25:59 +00:00
Chris Lattner 843cef8f3b Check in an EARLY START on a simple copying collector 
llvm-svn: 13698
 2004-05-23 21:25:45 +00:00