http://llvm.org https://git.amat.us/llvm/atom/runtime?h=release_25 2008-01-24T05:16:36Z 2008-01-24T05:16:36Z Gordon Henriksen gordonhenriksen@mac.com 2008-01-24T05:16:36Z urn:sha1:bcb265e2af6052895c400fe0d5729a23a82a5542 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46302 91177308-0d34-0410-b5e6-96231b3b80d8 2008-01-07T01:30:53Z Gordon Henriksen gordonhenriksen@mac.com 2008-01-07T01:30:53Z urn: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 2007-12-29T22:59:10Z Chris Lattner sabre@nondot.org 2007-12-29T22:59:10Z urn:sha1:234d529e582963ad4b5d83b911cd057fe99d1435 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45425 91177308-0d34-0410-b5e6-96231b3b80d8 2007-12-29T20:11:13Z Chris Lattner sabre@nondot.org 2007-12-29T20:11:13Z urn:sha1:57360d1f1cede3b26744d0ce3ade814fcc0f332d git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45416 91177308-0d34-0410-b5e6-96231b3b80d8 2007-09-27T19:31:36Z Gordon Henriksen gordonhenriksen@mac.com 2007-09-27T19:31:36Z urn: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 2007-09-11T17:12:32Z Chris Lattner sabre@nondot.org 2007-09-11T17:12:32Z urn:sha1:95bb69acbcec9a2e162875e7a940ccede90fd3f9 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41851 91177308-0d34-0410-b5e6-96231b3b80d8 2007-09-11T17:10:52Z Chris Lattner sabre@nondot.org 2007-09-11T17:10:52Z urn:sha1:210329a02562d196834eb2d4e1afcd7d9e37e87d git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41850 91177308-0d34-0410-b5e6-96231b3b80d8 2007-08-21T22:40:44Z Anton Korobeynikov asl@math.spbu.ru 2007-08-21T22:40:44Z urn:sha1:b08c6db11511275eee96c48534c351e4e02b850b git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41257 91177308-0d34-0410-b5e6-96231b3b80d8 2007-02-23T19:34:09Z Chris Lattner sabre@nondot.org 2007-02-23T19:34:09Z urn:sha1:6e3d3bc9ee8a9db57ac98dc03fe06f099b8015df git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34529 91177308-0d34-0410-b5e6-96231b3b80d8 2007-01-07T18:13:48Z Chris Lattner sabre@nondot.org 2007-01-07T18:13:48Z urn:sha1:5c4a96dfc57811c2c8eb238e2f702fb5a9dd9574 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32999 91177308-0d34-0410-b5e6-96231b3b80d8