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sdk/runtime/vm/class_id.h
T
Teagan Strickland b55342cb3e [vm/aot] Drop some Function objects not needed at runtime. 
In particular, don't serialize a function if its code is used by the
dispatch table, but there's no need for the function object itself
at runtime like dynamic lookup or dynamic invocation forwarders.

However, just because the owning function is not needed at runtime,
it may be used during serialization for things like assembly label
creation. Thus, instead of just clearing out the Code's owner field,
we add a new WeakSerializationReference (WSR) object whose target is
the original contents of the owner field. The WSR allows the
serializer to access the original owner, but also signals to the
serializer that the target should not be serialized in AOT snapshots
unless there are additional strong (non-WSR) references.

If no strong references are found, then the references to the WSR
in the snapshot are replaced with a reference to a WSR that only
contains the class ID of the original target. The serializer creates
only one WSR per class ID.

If strong references are found, then the target is still serialized.
In this case, the WSR is dropped entirely and any reference to it is
replaced with a direct reference to the serialized target. Thus, WSRs
only exist in the precompiled runtime for targets with no strong
references.

Changes on the Flutter gallery in release mode:
arm7: total size -1.10%, isolate size -6.08%
arm8: total size -1.16%, isolate size -6.09%

Bug: https://github.com/dart-lang/sdk/issues/41052

Change-Id: I5b435ca71ef85f50fe3484789087471a91aa4fe2
Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-release-x64-try,vm-kernel-precomp-linux-product-x64-try,vm-kernel-precomp-linux-release-simarm-try,vm-kernel-precomp-linux-release-simarm64-try,vm-kernel-precomp-linux-release-simarm_x64-try,vm-kernel-precomp-mac-release-simarm64-try,vm-kernel-precomp-win-release-x64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/137104
Commit-Queue: Tess Strickland <sstrickl@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Daco Harkes <dacoharkes@google.com>
2020-03-30 18:33:48 +00:00

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// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#ifndef RUNTIME_VM_CLASS_ID_H_
#define RUNTIME_VM_CLASS_ID_H_
// This header defines the list of VM implementation classes and their ids.
//
// Note: we assume that all builds of Dart VM use exactly the same class ids
// for these classes.
namespace dart {
#define CLASS_LIST_NO_OBJECT_NOR_STRING_NOR_ARRAY(V) \
V(Class) \
V(PatchClass) \
V(Function) \
V(ClosureData) \
V(SignatureData) \
V(RedirectionData) \
V(FfiTrampolineData) \
V(Field) \
V(Script) \
V(Library) \
V(Namespace) \
V(KernelProgramInfo) \
V(Code) \
V(Bytecode) \
V(Instructions) \
V(InstructionsSection) \
V(ObjectPool) \
V(PcDescriptors) \
V(CodeSourceMap) \
V(CompressedStackMaps) \
V(LocalVarDescriptors) \
V(ExceptionHandlers) \
V(Context) \
V(ContextScope) \
V(ParameterTypeCheck) \
V(SingleTargetCache) \
V(UnlinkedCall) \
V(MonomorphicSmiableCall) \
V(ICData) \
V(MegamorphicCache) \
V(SubtypeTestCache) \
V(Error) \
V(ApiError) \
V(LanguageError) \
V(UnhandledException) \
V(UnwindError) \
V(Instance) \
V(LibraryPrefix) \
V(TypeArguments) \
V(AbstractType) \
V(Type) \
V(TypeRef) \
V(TypeParameter) \
V(Closure) \
V(Number) \
V(Integer) \
V(Smi) \
V(Mint) \
V(Double) \
V(Bool) \
V(GrowableObjectArray) \
V(Float32x4) \
V(Int32x4) \
V(Float64x2) \
V(TypedDataBase) \
V(TypedData) \
V(ExternalTypedData) \
V(TypedDataView) \
V(Pointer) \
V(DynamicLibrary) \
V(Capability) \
V(ReceivePort) \
V(SendPort) \
V(StackTrace) \
V(RegExp) \
V(WeakProperty) \
V(MirrorReference) \
V(LinkedHashMap) \
V(FutureOr) \
V(UserTag) \
V(TransferableTypedData) \
V(WeakSerializationReference)
#define CLASS_LIST_ARRAYS(V) \
V(Array) \
V(ImmutableArray)
#define CLASS_LIST_STRINGS(V) \
V(String) \
V(OneByteString) \
V(TwoByteString) \
V(ExternalOneByteString) \
V(ExternalTwoByteString)
#define CLASS_LIST_TYPED_DATA(V) \
V(Int8Array) \
V(Uint8Array) \
V(Uint8ClampedArray) \
V(Int16Array) \
V(Uint16Array) \
V(Int32Array) \
V(Uint32Array) \
V(Int64Array) \
V(Uint64Array) \
V(Float32Array) \
V(Float64Array) \
V(Float32x4Array) \
V(Int32x4Array) \
V(Float64x2Array)
#define CLASS_LIST_FFI_NUMERIC(V) \
V(Int8) \
V(Int16) \
V(Int32) \
V(Int64) \
V(Uint8) \
V(Uint16) \
V(Uint32) \
V(Uint64) \
V(IntPtr) \
V(Float) \
V(Double)
#define CLASS_LIST_FFI_TYPE_MARKER(V) \
CLASS_LIST_FFI_NUMERIC(V) \
V(Void)
#define CLASS_LIST_FFI(V) \
V(Pointer) \
V(NativeFunction) \
CLASS_LIST_FFI_TYPE_MARKER(V) \
V(NativeType) \
V(DynamicLibrary) \
V(Struct)
#define CLASS_LIST_WASM(V) \
V(WasmInt32) \
V(WasmInt64) \
V(WasmFloat) \
V(WasmDouble) \
V(WasmVoid)
#define DART_CLASS_LIST_TYPED_DATA(V) \
V(Int8) \
V(Uint8) \
V(Uint8Clamped) \
V(Int16) \
V(Uint16) \
V(Int32) \
V(Uint32) \
V(Int64) \
V(Uint64) \
V(Float32) \
V(Float64) \
V(Float32x4) \
V(Int32x4) \
V(Float64x2)
#define CLASS_LIST_FOR_HANDLES(V) \
CLASS_LIST_NO_OBJECT_NOR_STRING_NOR_ARRAY(V) \
V(Array) \
V(String)
#define CLASS_LIST_NO_OBJECT(V) \
CLASS_LIST_NO_OBJECT_NOR_STRING_NOR_ARRAY(V) \
CLASS_LIST_ARRAYS(V) \
CLASS_LIST_STRINGS(V)
#define CLASS_LIST(V) \
V(Object) \
CLASS_LIST_NO_OBJECT(V)
enum ClassId {
// Illegal class id.
kIllegalCid = 0,
// The following entries describes classes for pseudo-objects in the heap
// that should never be reachable from live objects. Free list elements
// maintain the free list for old space, and forwarding corpses are used to
// implement one-way become.
kFreeListElement,
kForwardingCorpse,
// List of Ids for predefined classes.
#define DEFINE_OBJECT_KIND(clazz) k##clazz##Cid,
CLASS_LIST(DEFINE_OBJECT_KIND)
#undef DEFINE_OBJECT_KIND
// clang-format off
#define DEFINE_OBJECT_KIND(clazz) kFfi##clazz##Cid,
CLASS_LIST_FFI(DEFINE_OBJECT_KIND)
#undef DEFINE_OBJECT_KIND
#define DEFINE_OBJECT_KIND(clazz) k##clazz##Cid,
CLASS_LIST_WASM(DEFINE_OBJECT_KIND)
#undef DEFINE_OBJECT_KIND
#define DEFINE_OBJECT_KIND(clazz) \
kTypedData##clazz##Cid, \
kTypedData##clazz##ViewCid, \
kExternalTypedData##clazz##Cid,
CLASS_LIST_TYPED_DATA(DEFINE_OBJECT_KIND)
#undef DEFINE_OBJECT_KIND
kByteDataViewCid,
kByteBufferCid,
// clang-format on
// The following entries do not describe a predefined class, but instead
// are class indexes for pre-allocated instances (Null, dynamic, void, Never).
kNullCid,
kDynamicCid,
kVoidCid,
kNeverCid,
kNumPredefinedCids,
};
// Keep these in sync with the cid numbering above.
const int kTypedDataCidRemainderInternal = 0;
const int kTypedDataCidRemainderView = 1;
const int kTypedDataCidRemainderExternal = 2;
} // namespace dart
#endif // RUNTIME_VM_CLASS_ID_H_
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