Alexander Markov
17c33d8d52
This is a reland of 2852408881
Original change's description:
> [vm] Reduce size of Class objects in AOT and PRODUCT modes
>
> This change conditionally removes certain fields from Class objects
> in AOT and PRODUCT modes.
>
> Flutter gallery in release-sizeopt mode:
> Snapshot size -0.47% (arm64), -0.44% (arm)
> Heap size of snapshot objects -4.1% (arm64), -4.3% (arm)
>
> On a large Flutter application compiled in --dwarf-stack-traces mode:
> Heap size of Class objects -26%
> Heap size of all snapshot objects -3.6%
>
> TEST=ci
> Issue: https://github.com/dart-lang/sdk/issues/44020
> Change-Id: I795c625b71558cd2f336f92fc326c36fd339cd4b
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/195700
> Commit-Queue: Alexander Markov <alexmarkov@google.com>
> Reviewed-by: Ryan Macnak <rmacnak@google.com>
TEST=ci
Change-Id: Ib473a959a2c610b7a0e6f4000b2101e5256c6119
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/196103
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
128 lines
4.3 KiB
C++
128 lines
4.3 KiB
C++
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_VM_STUB_CODE_H_
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#define RUNTIME_VM_STUB_CODE_H_
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#include "vm/allocation.h"
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#include "vm/compiler/runtime_api.h"
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#include "vm/object.h"
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#include "vm/stub_code_list.h"
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#if !defined(DART_PRECOMPILED_RUNTIME)
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#include "vm/compiler/assembler/assembler.h"
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#include "vm/compiler/stub_code_compiler.h"
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#endif // !defined(DART_PRECOMPILED_RUNTIME)
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namespace dart {
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// Forward declarations.
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class Code;
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class Isolate;
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class ObjectPointerVisitor;
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class SnapshotReader;
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class SnapshotWriter;
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DECLARE_FLAG(bool, disassemble_stubs);
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// Is it permitted for the stubs above to refer to Object::null(), which is
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// allocated in the VM isolate and shared across all isolates.
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// However, in cases where a simple GC-safe placeholder is needed on the stack,
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// using Smi 0 instead of Object::null() is slightly more efficient, since a Smi
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// does not require relocation.
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// class StubCode is used to maintain the lifecycle of stubs.
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class StubCode : public AllStatic {
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public:
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// Generate all stubs which are shared across all isolates, this is done
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// only once and the stub code resides in the vm_isolate heap.
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static void Init();
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static void Cleanup();
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// Returns true if stub code has been initialized.
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static bool HasBeenInitialized();
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// Check if specified pc is in the dart invocation stub used for
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// transitioning into dart code.
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static bool InInvocationStub(uword pc);
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// Check if the specified pc is in the jump to frame stub.
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static bool InJumpToFrameStub(uword pc);
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// Returns NULL if no stub found.
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static const char* NameOfStub(uword entry_point);
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// Define the shared stub code accessors.
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#define STUB_CODE_ACCESSOR(name) \
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static const Code& name() { return *entries_[k##name##Index].code; } \
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static intptr_t name##Size() { return name().Size(); }
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VM_STUB_CODE_LIST(STUB_CODE_ACCESSOR);
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#undef STUB_CODE_ACCESSOR
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#if !defined(DART_PRECOMPILED_RUNTIME)
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static CodePtr GetAllocationStubForClass(const Class& cls);
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static CodePtr GetAllocationStubForTypedData(classid_t class_id);
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#endif // !defined(DART_PRECOMPILED_RUNTIME)
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#if !defined(TARGET_ARCH_IA32)
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static CodePtr GetBuildMethodExtractorStub(compiler::ObjectPoolBuilder* pool);
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#endif
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#if !defined(DART_PRECOMPILED_RUNTIME)
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// Generate the stub and finalize the generated code into the stub
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// code executable area.
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static CodePtr Generate(const char* name,
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compiler::ObjectPoolBuilder* object_pool_builder,
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void (*GenerateStub)(compiler::Assembler* assembler));
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#endif // !defined(DART_PRECOMPILED_RUNTIME)
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static const Code& UnoptimizedStaticCallEntry(intptr_t num_args_tested);
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static const char* NameAt(intptr_t index) { return entries_[index].name; }
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static const Code& EntryAt(intptr_t index) { return *(entries_[index].code); }
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static void EntryAtPut(intptr_t index, Code* entry) {
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ASSERT(entry->IsReadOnlyHandle());
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ASSERT(entries_[index].code == nullptr);
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entries_[index].code = entry;
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}
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static intptr_t NumEntries() { return kNumStubEntries; }
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#if !defined(DART_PRECOMPILED_RUNTIME)
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#define GENERATE_STUB(name) \
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static CodePtr BuildIsolateSpecific##name##Stub( \
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compiler::ObjectPoolBuilder* opw) { \
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return StubCode::Generate( \
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"_iso_stub_" #name, opw, \
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compiler::StubCodeCompiler::Generate##name##Stub); \
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}
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VM_STUB_CODE_LIST(GENERATE_STUB);
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#undef GENERATE_STUB
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#endif // !defined(DART_PRECOMPILED_RUNTIME)
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private:
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friend class MegamorphicCacheTable;
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enum {
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#define STUB_CODE_ENTRY(name) k##name##Index,
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VM_STUB_CODE_LIST(STUB_CODE_ENTRY)
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#undef STUB_CODE_ENTRY
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kNumStubEntries
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};
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struct StubCodeEntry {
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Code* code;
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const char* name;
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#if !defined(DART_PRECOMPILED_RUNTIME)
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void (*generator)(compiler::Assembler* assembler);
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#endif
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};
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static StubCodeEntry entries_[kNumStubEntries];
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};
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} // namespace dart
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#endif // RUNTIME_VM_STUB_CODE_H_
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