mirror of
https://github.com/c64scene-ar/llvm-6502.git
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8fa8929177
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
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|---|---|---|
| .. | ||
| GC | ||
| 2002-04-14-UnexpectedUnsignedType.ll | ||
| 2002-04-16-StackFrameSizeAlignment.ll | ||
| 2003-05-27-phifcmpd.ll | ||
| 2003-05-27-useboolinotherbb.ll | ||
| 2003-05-27-usefsubasbool.ll | ||
| 2003-05-28-ManyArgs.ll | ||
| 2003-05-30-BadFoldGEP.ll | ||
| 2003-05-30-BadPreselectPhi.ll | ||
| 2003-07-06-BadIntCmp.ll | ||
| 2003-07-07-BadLongConst.ll | ||
| 2003-07-08-BadCastToBool.ll | ||
| 2003-07-29-BadConstSbyte.ll | ||
| 2004-02-08-UnwindSupport.llx | ||
| 2004-05-09-LiveVarPartialRegister.llx | ||
| 2005-01-18-SetUO-InfLoop.ll | ||
| 2005-04-09-GlobalInPHI.ll | ||
| 2005-07-12-memcpy-i64-length.ll | ||
| 2005-10-18-ZeroSizeStackObject.ll | ||
| 2005-10-21-longlonggtu.ll | ||
| 2005-12-01-Crash.ll | ||
| 2005-12-12-ExpandSextInreg.ll | ||
| 2006-01-12-BadSetCCFold.ll | ||
| 2006-01-18-InvalidBranchOpcodeAssert.ll | ||
| 2006-02-12-InsertLibcall.ll | ||
| 2006-03-01-dagcombineinfloop.ll | ||
| 2006-03-27-DebugInfoNULLDeclare.ll | ||
| 2006-04-11-vecload.ll | ||
| 2006-04-26-SetCCAnd.ll | ||
| 2006-04-28-Sign-extend-bool.ll | ||
| 2006-05-06-GEP-Cast-Sink-Crash.ll | ||
| 2006-06-12-LowerSwitchCrash.ll | ||
| 2006-06-13-ComputeMaskedBitsCrash.ll | ||
| 2006-06-28-SimplifySetCCCrash.ll | ||
| 2006-07-03-schedulers.ll | ||
| 2006-08-30-CoallescerCrash.ll | ||
| 2006-09-02-LocalAllocCrash.ll | ||
| 2006-09-06-SwitchLowering.ll | ||
| 2006-10-27-CondFolding.ll | ||
| 2006-10-29-Crash.ll | ||
| 2006-11-06-MemIntrinsicExpand.ll | ||
| 2006-11-20-DAGCombineCrash.ll | ||
| 2006-12-16-InlineAsmCrash.ll | ||
| 2007-01-15-LoadSelectCycle.ll | ||
| 2007-02-16-BranchFold.ll | ||
| 2007-02-23-DAGCombine-Miscompile.ll | ||
| 2007-02-25-invoke.ll | ||
| 2007-04-08-MultipleFrameIndices.ll | ||
| 2007-04-13-SwitchLowerBadPhi.ll | ||
| 2007-04-14-BitTestsBadMask.ll | ||
| 2007-04-14-EHSelectorCrash.ll | ||
| 2007-04-17-lsr-crash.ll | ||
| 2007-04-27-BitTestsBadMask.ll | ||
| 2007-04-27-InlineAsm-X-Dest.ll | ||
| 2007-04-27-LargeMemObject.ll | ||
| 2007-04-30-LandingPadBranchFolding.ll | ||
| 2007-05-03-EHTypeInfo.ll | ||
| 2007-05-05-Personality.ll | ||
| 2007-05-15-InfiniteRecursion.ll | ||
| 2007-06-06-CriticalEdgeLandingPad.ll | ||
| 2007-11-21-UndeadIllegalNode.ll | ||
| 2007-12-17-InvokeAsm.ll | ||
| 2007-12-31-UnusedSelector.ll | ||
| addc-fold2.ll | ||
| asm-large-immediate.ll | ||
| badarg6.ll | ||
| badCallArgLRLLVM.ll | ||
| badFoldGEP.ll | ||
| badlive.ll | ||
| BasicInstrs.llx | ||
| bit-intrinsics.ll | ||
| bool-to-double.ll | ||
| BurgBadRegAlloc.ll | ||
| call2-ret0.ll | ||
| call-ret0.ll | ||
| call-ret42.ll | ||
| call-void.ll | ||
| cast-fp.ll | ||
| ConstantExprLowering.llx | ||
| constindices.ll | ||
| debug-info.ll | ||
| dg.exp | ||
| div-neg-power-2.ll | ||
| fneg-fabs.ll | ||
| fp_to_int.ll | ||
| fpowi-promote.ll | ||
| fwdtwice.ll | ||
| global-ret0.ll | ||
| hello.ll | ||
| i128-addsub.ll | ||
| i128-arith.ll | ||
| intrinsics.ll | ||
| invalid-memcpy.ll | ||
| isunord.ll | ||
| llvm-ct-intrinsics.ll | ||
| Makefile | ||
| negintconst.ll | ||
| nested-select.ll | ||
| phi-immediate-factoring.ll | ||
| print-add.ll | ||
| print-arith-fp.ll | ||
| print-arith-int.ll | ||
| print-int.ll | ||
| print-mul-exp.ll | ||
| print-mul.ll | ||
| print-shift.ll | ||
| ret0.ll | ||
| ret42.ll | ||
| sched.ll | ||
| select.ll | ||
| shift-int64.ll | ||
| spillccr.ll | ||
| stacksave-restore.ll | ||
| switch-crit-edge-constant.ll | ||
| switch-lower-feature-2.ll | ||
| switch-lower-feature.ll | ||
| switch-lower.ll | ||
| SwitchLowering.ll | ||
| vector-constantexpr.ll | ||
| vector-identity-shuffle.ll | ||
| vector.ll | ||