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author | Jarret Shook <jashoo@microsoft.com> | 2017-09-07 14:34:20 -0700 |
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committer | GitHub <noreply@github.com> | 2017-09-07 14:34:20 -0700 |
commit | 957c61acbfebc665135797ed503940241adfdb6d (patch) | |
tree | cafd87a5ec0b4937601f5236e5dde9a6e8b7d763 /src/vm/arm64 | |
parent | b7cce5a59f7c6bd5a33b88f2af252693bbbd7373 (diff) | |
parent | 2de13cfabfe6ad43cd8e00f6a0884e546c7516f1 (diff) | |
download | coreclr-957c61acbfebc665135797ed503940241adfdb6d.tar.gz coreclr-957c61acbfebc665135797ed503940241adfdb6d.tar.bz2 coreclr-957c61acbfebc665135797ed503940241adfdb6d.zip |
Merge pull request #12334 from sdmaclea/PR-Optimize-Jit-WriteBarriers
[Arm64] Optimize JIT_WriteBarriers
Diffstat (limited to 'src/vm/arm64')
-rw-r--r-- | src/vm/arm64/asmhelpers.S | 180 | ||||
-rw-r--r-- | src/vm/arm64/stubs.cpp | 21 |
2 files changed, 146 insertions, 55 deletions
diff --git a/src/vm/arm64/asmhelpers.S b/src/vm/arm64/asmhelpers.S index 017cc50f68..8179388c34 100644 --- a/src/vm/arm64/asmhelpers.S +++ b/src/vm/arm64/asmhelpers.S @@ -207,6 +207,106 @@ LEAF_END ThePreStubPatch, _TEXT LEAF_END_MARKED \name, _TEXT .endmacro +// ------------------------------------------------------------------ +// Start of the writeable code region +LEAF_ENTRY JIT_PatchedCodeStart, _TEXT + ret lr +LEAF_END JIT_PatchedCodeStart, _TEXT + +// void JIT_UpdateWriteBarrierState(bool skipEphemeralCheck) +// +// Update shadow copies of the various state info required for barrier +// +// State info is contained in a literal pool at the end of the function +// Placed in text section so that it is close enough to use ldr literal and still +// be relocatable. Eliminates need for PREPARE_EXTERNAL_VAR in hot code. +// +// Align and group state info together so it fits in a single cache line +// and each entry can be written atomically +// +WRITE_BARRIER_ENTRY JIT_UpdateWriteBarrierState + PROLOG_SAVE_REG_PAIR_INDEXED fp, lr, -16 + + // x0-x7 will contain intended new state + // x8 will preserve skipEphemeralCheck + // x12 will be used for pointers + + mov x8, x0 + + PREPARE_EXTERNAL_VAR g_card_table, x12 + ldr x0, [x12] + +#ifdef FEATURE_MANUALLY_MANAGED_CARD_BUNDLES + PREPARE_EXTERNAL_VAR g_card_bundle_table, x12 + ldr x1, [x12] +#endif + +#ifdef WRITE_BARRIER_CHECK + PREPARE_EXTERNAL_VAR g_GCShadow, x12 + ldr x2, [x12] +#endif + +#ifdef FEATURE_USE_SOFTWARE_WRITE_WATCH_FOR_GC_HEAP + PREPARE_EXTERNAL_VAR g_sw_ww_table, x12 + ldr x3, [x12] +#endif + + PREPARE_EXTERNAL_VAR g_ephemeral_low, x12 + ldr x4, [x12] + + PREPARE_EXTERNAL_VAR g_ephemeral_high, x12 + ldr x5, [x12] + + cbz x8, LOCAL_LABEL(EphemeralCheckEnabled) + movz x4, #0 + movn x5, #0 +LOCAL_LABEL(EphemeralCheckEnabled): + + PREPARE_EXTERNAL_VAR g_lowest_address, x12 + ldr x6, [x12] + + PREPARE_EXTERNAL_VAR g_highest_address, x12 + ldr x7, [x12] + + // Update wbs state + adr x12, LOCAL_LABEL(wbs_begin) + + stp x0, x1, [x12], 16 + stp x2, x3, [x12], 16 + stp x4, x5, [x12], 16 + stp x6, x7, [x12], 16 + + EPILOG_RESTORE_REG_PAIR_INDEXED fp, lr, 16 + EPILOG_RETURN + + // Begin patchable literal pool + .balign 64 // Align to power of two at least as big as patchable literal pool so that it fits optimally in cache line +LOCAL_LABEL(wbs_begin): +LOCAL_LABEL(wbs_card_table): + .quad 0 +LOCAL_LABEL(wbs_card_bundle_table): + .quad 0 +LOCAL_LABEL(wbs_GCShadow): + .quad 0 +LOCAL_LABEL(wbs_sw_ww_table): + .quad 0 +LOCAL_LABEL(wbs_ephemeral_low): + .quad 0 +LOCAL_LABEL(wbs_ephemeral_high): + .quad 0 +LOCAL_LABEL(wbs_lowest_address): + .quad 0 +LOCAL_LABEL(wbs_highest_address): + .quad 0 +WRITE_BARRIER_END JIT_UpdateWriteBarrierState + + +// ------------------------------------------------------------------ +// End of the writeable code region +LEAF_ENTRY JIT_PatchedCodeLast, _TEXT + ret lr +LEAF_END JIT_PatchedCodeLast, _TEXT + // void JIT_ByRefWriteBarrier // On entry: // x13 : the source address (points to object reference to write) @@ -235,19 +335,16 @@ WRITE_BARRIER_END JIT_ByRefWriteBarrier // // On exit: // x12 : trashed -// x14 : incremented by 8 +// x14 : trashed (incremented by 8 to implement JIT_ByRefWriteBarrier contract) // x15 : trashed // x17 : trashed (ip1) if FEATURE_USE_SOFTWARE_WRITE_WATCH_FOR_GC_HEAP // WRITE_BARRIER_ENTRY JIT_CheckedWriteBarrier - PREPARE_EXTERNAL_VAR g_lowest_address, x12 - ldr x12, [x12] + ldr x12, LOCAL_LABEL(wbs_lowest_address) cmp x14, x12 - blt LOCAL_LABEL(NotInHeap) - PREPARE_EXTERNAL_VAR g_highest_address, x12 - ldr x12, [x12] - cmp x14, x12 + ldr x12, LOCAL_LABEL(wbs_highest_address) + ccmp x14, x12, #0x0, ge blt C_FUNC(JIT_WriteBarrier) LOCAL_LABEL(NotInHeap): @@ -262,7 +359,7 @@ WRITE_BARRIER_END JIT_CheckedWriteBarrier // // On exit: // x12 : trashed -// x14 : incremented by 8 +// x14 : trashed (incremented by 8 to implement JIT_ByRefWriteBarrier contract) // x15 : trashed // x17 : trashed (ip1) if FEATURE_USE_SOFTWARE_WRITE_WATCH_FOR_GC_HEAP // @@ -272,23 +369,24 @@ WRITE_BARRIER_ENTRY JIT_WriteBarrier #ifdef WRITE_BARRIER_CHECK // Update GC Shadow Heap - // need temporary registers. Save them before using. - stp x12, x13, [sp, #-16]! + // Do not perform the work if g_GCShadow is 0 + ldr x12, LOCAL_LABEL(wbs_GCShadow) + cbz x12, LOCAL_LABEL(ShadowUpdateDisabled) + + // need temporary register. Save before using. + str x13, [sp, #-16]! // Compute address of shadow heap location: // pShadow = g_GCShadow + (x14 - g_lowest_address) - PREPARE_EXTERNAL_VAR g_lowest_address, x12 - ldr x12, [x12] - sub x12, x14, x12 - PREPARE_EXTERNAL_VAR g_GCShadow, x13 - ldr x13, [x13] + ldr x13, LOCAL_LABEL(wbs_lowest_address) + sub x13, x14, x13 add x12, x13, x12 // if (pShadow >= g_GCShadowEnd) goto end PREPARE_EXTERNAL_VAR g_GCShadowEnd, x13 ldr x13, [x13] cmp x12, x13 - bhs LOCAL_LABEL(shadowupdateend) + bhs LOCAL_LABEL(ShadowUpdateEnd) // *pShadow = x15 str x15, [x12] @@ -300,25 +398,22 @@ WRITE_BARRIER_ENTRY JIT_WriteBarrier // if ([x14] == x15) goto end ldr x13, [x14] cmp x13, x15 - beq LOCAL_LABEL(shadowupdateend) + beq LOCAL_LABEL(ShadowUpdateEnd) // *pShadow = INVALIDGCVALUE (0xcccccccd) - mov x13, #0 - movk x13, #0xcccd + movz x13, #0xcccd movk x13, #0xcccc, LSL #16 str x13, [x12] -LOCAL_LABEL(shadowupdateend): - ldp x12, x13, [sp],#16 +LOCAL_LABEL(ShadowUpdateEnd): + ldr x13, [sp], #16 +LOCAL_LABEL(ShadowUpdateDisabled): #endif #ifdef FEATURE_USE_SOFTWARE_WRITE_WATCH_FOR_GC_HEAP // Update the write watch table if necessary - PREPARE_EXTERNAL_VAR g_sw_ww_enabled_for_gc_heap, x12 - ldrb w12, [x12] + ldr x12, LOCAL_LABEL(wbs_sw_ww_table) cbz x12, LOCAL_LABEL(CheckCardTable) - PREPARE_EXTERNAL_VAR g_sw_ww_table, x12 - ldr x12, [x12] add x12, x12, x14, lsr #0xc // SoftwareWriteWatch::AddressToTableByteIndexShift ldrb w17, [x12] cbnz x17, LOCAL_LABEL(CheckCardTable) @@ -329,20 +424,18 @@ LOCAL_LABEL(shadowupdateend): LOCAL_LABEL(CheckCardTable): // Branch to Exit if the reference is not in the Gen0 heap // - PREPARE_EXTERNAL_VAR g_ephemeral_low, x12 - ldr x12, [x12] + ldr x12, LOCAL_LABEL(wbs_ephemeral_low) + cbz x12, LOCAL_LABEL(SkipEphemeralCheck) cmp x15, x12 - blt LOCAL_LABEL(Exit) - PREPARE_EXTERNAL_VAR g_ephemeral_high, x12 - ldr x12, [x12] - cmp x15, x12 + ldr x12, LOCAL_LABEL(wbs_ephemeral_high) + ccmp x15, x12, 0x0, ge bgt LOCAL_LABEL(Exit) +LOCAL_LABEL(SkipEphemeralCheck): // Check if we need to update the card table - PREPARE_EXTERNAL_VAR g_card_table, x12 - ldr x12, [x12] - add x15, x12, x14, lsr #11 + ldr x12, LOCAL_LABEL(wbs_card_table) + add x15, x12, x14, lsr #11 ldrb w12, [x15] cmp x12, 0xFF beq LOCAL_LABEL(Exit) @@ -352,10 +445,9 @@ LOCAL_LABEL(UpdateCardTable): strb w12, [x15] #ifdef FEATURE_MANUALLY_MANAGED_CARD_BUNDLES - // Check if we need to update the card table - PREPARE_EXTERNAL_VAR g_card_bundle_table, x12 - ldr x12, [x12] - add x15, x12, x14, lsr #21 + // Check if we need to update the card bundle table + ldr x12, LOCAL_LABEL(wbs_card_bundle_table) + add x15, x12, x14, lsr #21 ldrb w12, [x15] cmp x12, 0xFF beq LOCAL_LABEL(Exit) @@ -370,18 +462,6 @@ LOCAL_LABEL(Exit): ret lr WRITE_BARRIER_END JIT_WriteBarrier -// ------------------------------------------------------------------ -// Start of the writeable code region -LEAF_ENTRY JIT_PatchedCodeStart, _TEXT - ret lr -LEAF_END JIT_PatchedCodeStart, _TEXT - -// ------------------------------------------------------------------ -// End of the writeable code region -LEAF_ENTRY JIT_PatchedCodeLast, _TEXT - ret lr -LEAF_END JIT_PatchedCodeLast, _TEXT - //------------------------------------------------ // VirtualMethodFixupStub // diff --git a/src/vm/arm64/stubs.cpp b/src/vm/arm64/stubs.cpp index 8196ae00b6..7e7c2e8088 100644 --- a/src/vm/arm64/stubs.cpp +++ b/src/vm/arm64/stubs.cpp @@ -20,6 +20,8 @@ EXTERN_C void JIT_GetSharedNonGCStaticBase_SingleAppDomain(); EXTERN_C void JIT_GetSharedNonGCStaticBaseNoCtor_SingleAppDomain(); EXTERN_C void JIT_GetSharedGCStaticBase_SingleAppDomain(); EXTERN_C void JIT_GetSharedGCStaticBaseNoCtor_SingleAppDomain(); +EXTERN_C void JIT_UpdateWriteBarrierState(bool skipEphemeralCheck); + #ifndef DACCESS_COMPILE //----------------------------------------------------------------------- @@ -1119,7 +1121,15 @@ void InitJITHelpers1() SetJitHelperFunction(CORINFO_HELP_GETSHARED_GCSTATIC_BASE_NOCTOR, JIT_GetSharedGCStaticBaseNoCtor_SingleAppDomain); SetJitHelperFunction(CORINFO_HELP_GETSHARED_NONGCSTATIC_BASE_NOCTOR,JIT_GetSharedNonGCStaticBaseNoCtor_SingleAppDomain); } + + JIT_UpdateWriteBarrierState(GCHeapUtilities::IsServerHeap()); } +#ifndef FEATURE_PAL // TODO-ARM64-WINDOWS #13592 +EXTERN_C void JIT_UpdateWriteBarrierState(bool) {} +#endif + +#else +EXTERN_C void JIT_UpdateWriteBarrierState(bool) {} #endif // !defined(DACCESS_COMPILE) && !defined(CROSSGEN_COMPILE) EXTERN_C void __stdcall ProfileEnterNaked(UINT_PTR clientData) @@ -1338,28 +1348,29 @@ LONG CLRNoCatchHandler(EXCEPTION_POINTERS* pExceptionInfo, PVOID pv) return EXCEPTION_CONTINUE_SEARCH; } +#ifndef CROSSGEN_COMPILE void StompWriteBarrierEphemeral(bool isRuntimeSuspended) { - return; + JIT_UpdateWriteBarrierState(GCHeapUtilities::IsServerHeap()); } void StompWriteBarrierResize(bool isRuntimeSuspended, bool bReqUpperBoundsCheck) { - return; + JIT_UpdateWriteBarrierState(GCHeapUtilities::IsServerHeap()); } #ifdef FEATURE_USE_SOFTWARE_WRITE_WATCH_FOR_GC_HEAP void SwitchToWriteWatchBarrier(bool isRuntimeSuspended) { - return; + JIT_UpdateWriteBarrierState(GCHeapUtilities::IsServerHeap()); } void SwitchToNonWriteWatchBarrier(bool isRuntimeSuspended) { - return; + JIT_UpdateWriteBarrierState(GCHeapUtilities::IsServerHeap()); } #endif // FEATURE_USE_SOFTWARE_WRITE_WATCH_FOR_GC_HEAP - +#endif // CROSSGEN_COMPILE #ifdef DACCESS_COMPILE BOOL GetAnyThunkTarget (T_CONTEXT *pctx, TADDR *pTarget, TADDR *pTargetMethodDesc) |