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Jake Hughes 5f6aa2e5bf [heap] Add object start bitmap for conservative stack scanning 
With conservative stack scanning enabled, a snapshot of the call stack
upon entry to GC will be used to determine part of the root-set. When
the collector walks the stack, it looks at each value and determines
whether it could be a potential on-heap object pointer. However, unlike
with Handles, these on-stack pointers aren't guaranteed to point to the
start of the object: the compiler may decide hide these pointers, and
create interior pointers in C++ frames which the GC doesn't know about.

The solution to this is to include an object start bitmap in the header
of each page. Each bit in the bitmap represents a word in the page
payload which is set when an object is allocated. This means that when
the collector finds an arbitrary potential pointer into the page, it can
walk backwards through the bitmap until it finds the relevant object's
base pointer. To prevent the bitmap becoming stale after compaction, it
is rebuilt during object sweeping.

This is experimental, and currently only works with inline allocation
disabled, and single generational collection.

Bug: v8:10614
Change-Id: I28ebd9562f58f335f8b3c2d1189cdf39feaa1f52
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2375195
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69615}
2020-08-31 07:10:36 +00:00
..
compiler [handles] Check FLAG_local_heaps in IsDereferenceAllowed() 2020-08-25 14:25:03 +00:00
heap [heap] Add object start bitmap for conservative stack scanning 2020-08-31 07:10:36 +00:00
interpreter [atomics] Relax Atomics methods to work on ArrayBuffers 2020-08-13 22:10:07 +00:00
libplatform [cpu-profiler] Remove hi-res options via tracing category 2020-05-14 15:30:04 +00:00
libsampler [cpu-profiler] Only record SIGPROF-based samples for samplers that request samples 2019-02-13 09:29:38 +00:00
parsing Fix tests to work with single generation heap 2020-07-07 09:30:57 +00:00
torque [torque][csa] fix word8 phi MachineRepresentation 2020-08-05 15:25:46 +00:00
wasm [wasm] Allow specifying larger code space limits 2020-08-28 16:25:36 +00:00
assembler-helper-arm.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
assembler-helper-arm.h Move handles-related files to src/handles 2019-05-23 06:00:15 +00:00
BUILD.gn [unwinder] Delete the old unwinder API 2020-08-24 10:36:59 +00:00
cctest.cc Revert "[heap] Add concurrent typed slot recording" 2020-08-28 06:41:06 +00:00
cctest.h Revert "[heap] Add concurrent typed slot recording" 2020-08-28 06:41:06 +00:00
cctest.status [arm] Update unwinder for JSEntry frames for arm32 2020-08-27 09:46:54 +00:00
collector.h Move remaining files in src/ 2019-05-24 18:24:36 +00:00
DEPS Reland "[tracing] Roll perfetto @ 28b633cd" 2019-09-06 13:42:02 +00:00
disasm-regex-helper.cc [turbofan] Improve load poisoning tests. 2019-07-02 17:55:04 +00:00
disasm-regex-helper.h [turbofan] Improve load poisoning tests. 2019-07-02 17:55:04 +00:00
expression-type-collector-macros.h [cleanup] Fix remaining (D)CHECK macro usages 2017-10-18 10:12:31 +00:00
gay-fixed.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
gay-fixed.h Move utility code to src/utils 2019-05-23 14:13:34 +00:00
gay-precision.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
gay-precision.h Move utility code to src/utils 2019-05-23 14:13:34 +00:00
gay-shortest.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
gay-shortest.h Move utility code to src/utils 2019-05-23 14:13:34 +00:00
manually-externalized-buffer.h [api] Deprecate [Shared]ArrayBuffer::Externalize/GetContents and constructors 2019-10-29 22:01:54 +00:00
OWNERS [owners] Remove redundant OWNERS files in test/ 2019-06-24 12:44:32 +00:00
print-extension.cc Use nullptr instead of NULL where possible 2017-10-13 17:21:49 +00:00
print-extension.h [cleanup] Mark test/ methods in subclasses with override. 2018-09-17 07:40:00 +00:00
profiler-extension.cc Reland "[Compile] Ensure we don't access the native context during bytecode finalization." 2018-10-26 22:33:56 +00:00
profiler-extension.h [cleanup] Mark test/ methods in subclasses with override. 2018-09-17 07:40:00 +00:00
scope-test-helper.h [parser] Various Scope and Context speedups 2019-01-28 13:06:03 +00:00
setup-isolate-for-tests.cc [interpreter] Always put bytecode handlers in builtins table 2018-09-20 09:58:15 +00:00
setup-isolate-for-tests.h Move initialization code into src/init 2019-05-16 12:36:15 +00:00
test-access-checks.cc Replace CHECK(false) by UNREACHABLE() 2017-12-19 18:58:07 +00:00
test-accessor-assembler.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-accessors.cc [api] Create v8::String::NewFromLiteral that returns Local<String> 2020-03-09 12:02:07 +00:00
test-allocation.cc [zone-compr] Initial support for zone pointer compression 2020-07-24 08:27:21 +00:00
test-api-accessors.cc [Respect] Rename lists 2020-06-22 15:15:31 +00:00
test-api-array-buffer.cc [arraybuffer][test] Test creating a BackingStore with nullptr 2020-07-27 14:04:40 +00:00
test-api-icu.cc Correct typo of Chinese locale zn_CN to zh_CN 2020-04-21 08:05:43 +00:00
test-api-interceptors.cc Rename and retype Symbol name to description 2019-10-30 10:38:55 +00:00
test-api-stack-traces.cc [api] Create v8::String::NewFromLiteral that returns Local<String> 2020-03-09 12:02:07 +00:00
test-api-typed-array.cc [api] Deprecate [Shared]ArrayBuffer::Externalize/GetContents and constructors 2019-10-29 22:01:54 +00:00
test-api-wasm.cc [wasm-simd] Add use counter for SIMD opcodes 2020-05-08 19:14:00 +00:00
test-api.cc [unwinder] Delete the old unwinder API 2020-08-24 10:36:59 +00:00
test-api.h [test-api] Extract arraybufs and typed arrays 2019-06-17 15:27:01 +00:00
test-array-list.cc Move more relevant files to src/objects 2019-05-23 08:52:30 +00:00
test-assembler-arm64.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-assembler-arm.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-assembler-ia32.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-assembler-mips64.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-assembler-mips.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-assembler-ppc.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-assembler-s390.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-assembler-x64.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-atomicops.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
test-backing-store.cc Reland x6 [arraybuffer] Rearchitect backing store ownership 2019-09-09 13:07:42 +00:00
test-bignum-dtoa.cc [cleanup] Remove V8_2PART_UINT64_C macro 2020-07-20 11:52:17 +00:00
test-bignum.cc [cleanup] Remove V8_2PART_UINT64_C macro 2020-07-20 11:52:17 +00:00
test-bit-vector.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
test-circular-queue.cc Reland "[d8] Remove maximum workers limitation" 2019-07-30 07:56:17 +00:00
test-code-layout.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-code-pages.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-code-stub-assembler.cc [csa][cleanup] Remove ParameterMode from ExtractFixedArray 2020-07-29 10:49:33 +00:00
test-compiler.cc [nci] Change testing mode to --turbo-nci-as-midtier 2020-08-20 12:54:40 +00:00
test-concurrent-descriptor-array.cc [compiler] Test to search TransitionArrays on background and main thread 2020-07-14 11:55:24 +00:00
test-concurrent-prototype.cc [compiler] Don't serialize BytecodeArrayData's source_positions_ 2020-07-14 11:01:44 +00:00
test-concurrent-script-context-table.cc [turbofan] More ScriptContextTable concurrency 2020-07-22 09:23:37 +00:00
test-concurrent-transition-array.cc [compiler] Test background thread accessing old TransitionArray 2020-07-29 12:39:53 +00:00
test-constantpool.cc [ptr-compr][ppc] Implement pointer compression 2020-05-06 19:06:32 +00:00
test-conversions.cc [cleanup] Remove V8_2PART_UINT64_C macro 2020-07-20 11:52:17 +00:00
test-cpu-profiler.cc [js-function] Remove deprecated predicates 2020-08-11 11:53:00 +00:00
test-date.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
test-debug-helper.cc Reland "[heap] Make ReadOnlySpace use bump pointer allocation" 2020-06-18 11:48:38 +00:00
test-debug.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-decls.cc [api] Create v8::String::NewFromLiteral that returns Local<String> 2020-03-09 12:02:07 +00:00
test-deoptimization.cc [js-function] Remove deprecated predicates 2020-08-11 11:53:00 +00:00
test-dictionary.cc [objects] Pass isolate to HashTable accesses 2020-07-09 08:11:08 +00:00
test-disasm-arm64.cc [arm64] Use B instruction key for return address signing 2020-06-16 11:02:59 +00:00
test-disasm-arm.cc Reland "[wasm-simd][arm] Use vmov to move all ones to register" 2020-08-11 19:47:06 +00:00
test-disasm-ia32.cc [ia32][wasm-simd] Fix aligned moves in codegen 2020-08-28 22:59:56 +00:00
test-disasm-mips64.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
test-disasm-mips.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
test-disasm-ppc.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
test-disasm-s390.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
test-disasm-x64.cc [wasm-simd][x64] Check for register when emitting shuffles 2020-08-25 17:52:16 +00:00
test-diy-fp.cc [cleanup] Remove V8_2PART_UINT64_C macro 2020-07-20 11:52:17 +00:00
test-double.cc [cleanup] Remove V8_2PART_UINT64_C macro 2020-07-20 11:52:17 +00:00
test-dtoa.cc [cleanup] Remove V8_2PART_UINT64_C macro 2020-07-20 11:52:17 +00:00
test-elements-kind.cc [compiler][cleanup] Move Make(String|Name) helper methods to cctest.h 2020-05-26 15:26:28 +00:00
test-factory.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-fast-dtoa.cc [cleanup] Remove V8_2PART_UINT64_C macro 2020-07-20 11:52:17 +00:00
test-feedback-vector.cc [Turbofan] Allow CallIC to be polymorphic for same SharedFunctionInfos 2020-02-29 09:09:42 +00:00
test-feedback-vector.h [compiler] Make is_compiled_scope take an explicit Isolate 2020-07-06 15:49:55 +00:00
test-field-type-tracking.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-fixed-dtoa.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
test-flags.cc [wasm] Remove the --wasm-interpret-all flag 2020-04-28 08:14:52 +00:00
test-func-name-inference.cc [api] Create v8::String::NewFromLiteral that returns Local<String> 2020-03-09 12:02:07 +00:00
test-fuzz-arm64.cc Move architecture dependent files 2019-05-28 14:02:15 +00:00
test-global-handles.cc Fix tests to work with single generation heap 2020-07-07 09:30:57 +00:00
test-global-object.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
test-hashcode.cc [ptr-compr] Pass Isolate to JSObject::NormalizeProperties() 2019-06-11 11:11:10 +00:00
test-hashmap.cc [cleanup] Replace function typedefs by using declarations 2019-05-28 08:35:08 +00:00
test-heap-profiler.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-icache.cc [arm64] Use BTI instructions for forward CFI 2020-03-17 17:52:28 +00:00
test-identity-map.cc Fix tests to work with single generation heap 2020-07-07 09:30:57 +00:00
test-inobject-slack-tracking.cc Use consistent capitalization rules for instance types 2019-10-09 17:44:42 +00:00
test-inspector.cc Implement protocol::Binary to/from base64 conversion 2020-04-30 08:46:05 +00:00
test-intl.cc [lookup] Refactor LookupIterator "property or element" creation 2020-01-09 18:39:11 +00:00
test-javascript-arm64.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
test-js-arm64-variables.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
test-js-weak-refs.cc [torque] port FinalizationGroup methods to torque 2020-07-30 14:34:06 +00:00
test-liveedit.cc Add quotes around unexpected token SyntaxError 2019-06-11 06:11:58 +00:00
test-local-handles.cc [handle] Zap local and persistent handles 2020-07-29 11:06:33 +00:00
test-lockers.cc Replace base::make_unique by std::make_unique 2019-09-10 11:21:51 +00:00
test-log-stack-tracer.cc [cleanup] Remove unused TickSample class from the public API 2019-08-22 07:27:35 +00:00
test-log.cc Revert "s390: [arm] Add missing RELATIVE_CODE_TARGET iteration" 2020-05-12 15:13:59 +00:00
test-macro-assembler-arm64.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-macro-assembler-arm.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-macro-assembler-mips64.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-macro-assembler-mips.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-macro-assembler-x64.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-managed.cc Move more relevant files to src/objects 2019-05-23 08:52:30 +00:00
test-mementos.cc Move more relevant files to src/objects 2019-05-23 08:52:30 +00:00
test-modules.cc [runtime] Use TLA in more tests 2020-03-16 14:43:53 +00:00
test-object.cc Make ToInteger always truncate -0 2020-03-02 20:40:01 +00:00
test-orderedhashtable.cc [offthread] Deisolatify dictionaries 2020-03-03 20:08:54 +00:00
test-parsing.cc [zone] Cleanup zone allocations in src/ast and tests 2020-07-10 13:48:20 +00:00
test-persistent-handles.cc [heap] Attach PersistentHandles with EnsurePersistentHandles 2020-07-31 12:06:39 +00:00
test-platform.cc s390: Edited Generate_CEntry to correctly return buffer when built with clang 2018-09-05 07:01:16 +00:00
test-pointer-auth-arm64.cc [arm64] Add support for pointer authentication instructions 2019-07-24 17:00:26 +00:00
test-poison-disasm-arm64.cc [arm64] Intentionally corrupt the upper half of decompressed SMIs 2019-11-19 12:14:12 +00:00
test-poison-disasm-arm.cc [cctest][turboprop] Disable DisasmPoisonMonomorphicLoadFloat64 for arm 2020-07-30 10:41:36 +00:00
test-profile-generator.cc [cpu-profiler] Rename RecordTickSample to SymbolizeTickSample 2020-05-18 07:13:59 +00:00
test-random-number-generator.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
test-regexp.cc [regexp] Prototype new linear time EXPERIMENTAL regexp engine 2020-08-18 05:51:24 +00:00
test-representation.cc Move relevant files to src/objects 2019-05-20 08:57:47 +00:00
test-roots.cc [heap] Use BasicMemoryChunk::FromHeapObject more 2020-06-17 14:05:48 +00:00
test-sampler-api.cc Reland "[arm64] Protect return addresses stored on stack" 2020-02-13 12:26:25 +00:00
test-serialize.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-smi-lexicographic-compare.cc [cleanup] Eliminate non-const reference parameters 2019-09-10 09:31:07 +00:00
test-stack-unwinding-win64.cc Unwind V8 frames correctly on Windows ARM64 2019-07-31 06:24:45 +00:00
test-strings.cc [runtime] Move string table off-heap 2020-08-06 12:27:18 +00:00
test-strtod.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
test-symbols.cc Move utility code to src/utils 2019-05-23 14:13:34 +00:00
test-sync-primitives-arm64.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-sync-primitives-arm.cc Reland "[d8] Remove maximum workers limitation" 2019-07-30 07:56:17 +00:00
test-thread-termination.cc [weakrefs] Call Isolate::ClearKeptObjects() as part of microtask checkpoint 2020-02-19 02:25:34 +00:00
test-threads.cc Replace base::make_unique by std::make_unique 2019-09-10 11:21:51 +00:00
test-trace-event.cc Replace base::make_unique by std::make_unique 2019-09-10 11:21:51 +00:00
test-traced-value.cc [tracing] Improve tracing signals for compilation/optimization. 2019-03-25 14:49:08 +00:00
test-transitions.cc [ptr-compr] Isolatify Map::MigrateToMap() and friends 2019-07-03 08:08:05 +00:00
test-transitions.h [compiler] Test transition from Uninitialized to kFullTransitionArray 2020-07-28 13:03:31 +00:00
test-typedarrays.cc [api] Deprecate [Shared]ArrayBuffer::Externalize/GetContents and constructors 2019-10-29 22:01:54 +00:00
test-types.cc [turbofan] Normalize types for Oddball constants 2020-03-12 14:28:52 +00:00
test-unboxed-doubles.cc [compiler][cleanup] Move Make(String|Name) helper methods to cctest.h 2020-05-26 15:26:28 +00:00
test-unscopables-hidden-prototype.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
test-unwinder-code-pages.cc [nci] Replace CompilationTarget with a new Code::Kind value 2020-08-05 12:27:22 +00:00
test-usecounters.cc [atomics] Remove the deprecated Atomics.wake 2020-08-10 23:02:17 +00:00
test-utils-arm64.cc [arm64][cleanup] Remove CPURegister::Is and CPURegister::is 2019-11-14 12:58:09 +00:00
test-utils-arm64.h Move architecture dependent files 2019-05-28 14:02:15 +00:00
test-utils.cc [cleanup] Split out bit-field.h and bounds.h from utils/utils.h 2019-11-15 13:00:08 +00:00
test-v8windbg.cc [tools] Add v8windbg, a WinDbg extension for V8 2020-02-18 19:16:18 +00:00
test-version.cc Move remaining files in src/ 2019-05-24 18:24:36 +00:00
test-weakmaps.cc Fix tests to work with single generation heap 2020-07-07 09:30:57 +00:00
test-weaksets.cc [objects] rename kSize to kHeaderSize for JSObject subclasses 2019-11-18 15:17:52 +00:00
testcfg.py Reland "Preparing v8 to use with python3 /test" 2019-03-20 09:56:06 +00:00
trace-extension.cc [api] Create v8::String::NewFromLiteral that returns Local<String> 2020-03-09 12:02:07 +00:00
trace-extension.h [cleanup] Remove unused TickSample class from the public API 2019-08-22 07:27:35 +00:00
unicode-helpers.cc Move string-related files to src/strings 2019-05-21 07:17:48 +00:00
unicode-helpers.h Move string-related files to src/strings 2019-05-21 07:17:48 +00:00