llvm/runtime/GC, branch release_23http://llvm.orghttps://git.amat.us/llvm/atom/runtime/GC?h=release_232008-01-24T05:16:36ZFixing the stack walker.2008-01-24T05:16:36ZGordon Henriksengordonhenriksen@mac.com2008-01-24T05:16:36Zurn:sha1:bcb265e2af6052895c400fe0d5729a23a82a5542
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46302 91177308-0d34-0410-b5e6-96231b3b80d8
With this patch, the LowerGC transformation becomes the2008-01-07T01:30:53ZGordon Henriksengordonhenriksen@mac.com2008-01-07T01:30:53Zurn:sha1:8fa89291774a29ee30adb9d0fd01655c84eaac13
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)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45670 91177308-0d34-0410-b5e6-96231b3b80d8
remove attribution from a variety of miscellaneous files.2007-12-29T22:59:10ZChris Lattnersabre@nondot.org2007-12-29T22:59:10Zurn:sha1:234d529e582963ad4b5d83b911cd057fe99d1435
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45425 91177308-0d34-0410-b5e6-96231b3b80d8
remove attributions from the rest of the llvm makefiles.2007-12-29T20:11:13ZChris Lattnersabre@nondot.org2007-12-29T20:11:13Zurn:sha1:57360d1f1cede3b26744d0ce3ade814fcc0f332d
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45416 91177308-0d34-0410-b5e6-96231b3b80d8
GarbageCollection.html is expanded to encompass the coming2007-09-27T19:31:36ZGordon Henriksengordonhenriksen@mac.com2007-09-27T19:31:36Zurn:sha1:326e24fff011f9f5af62bfd2dae964dcd4fd6792
capabilities. This is a major rewrite and is easier to read en toto
rather than patchwise.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42414 91177308-0d34-0410-b5e6-96231b3b80d8
Undo removal of the runtime libraries. While this may have been a bit2006-11-17T03:32:33ZReid Spencerrspencer@reidspencer.com2006-11-17T03:32:33Zurn:sha1:8b2e1419cf24a33df5a87c99e367528b44dc28cf
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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31807 91177308-0d34-0410-b5e6-96231b3b80d8
In LLVM 2.0 we won't use the runtime libraries as llvm-gcc3 support will2006-11-16T23:17:27ZReid Spencerrspencer@reidspencer.com2006-11-16T23:17:27Zurn:sha1:ac90d5e50b327476dcb468668f8e0eec3fb923d0
be dropped. This patch pertains to removing the runtime directory from LLVM.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31793 91177308-0d34-0410-b5e6-96231b3b80d8
Use archive libraries instead of object files for VMCore, BCReader,2006-06-01T01:30:27ZReid Spencerrspencer@reidspencer.com2006-06-01T01:30:27Zurn:sha1:18c8b49e7d3c94d7f84a4205a19f8761722fc4e5
BCWriter, and bzip2 libraries. Adjust the various makefiles to accommodate
these changes. This was done to speed up link times.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28610 91177308-0d34-0410-b5e6-96231b3b80d8
This never got updated to reflect the project makefile changes2005-10-18T18:48:30ZChris Lattnersabre@nondot.org2005-10-18T18:48:30Zurn:sha1:ed069fcf88b327cc3ffe4bcc331942c55923e964
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23789 91177308-0d34-0410-b5e6-96231b3b80d8
Remove trailing whitespace2005-04-21T23:48:37ZMisha Brukmanbrukman+llvm@gmail.com2005-04-21T23:48:37Zurn:sha1:fd93908ae8b9684fe71c239e3c6cfe13ff6a2663
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21427 91177308-0d34-0410-b5e6-96231b3b80d8