mirror of
https://github.com/dart-lang/sdk
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1a41627ecc
Prerequisite for using multiple isolate snapshots in the same process. R=fschneider@google.com Review-Url: https://codereview.chromium.org/2583673002 .
233 lines
6.9 KiB
C++
233 lines
6.9 KiB
C++
// Copyright (c) 2012, 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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#include "vm/stub_code.h"
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#include "platform/assert.h"
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#include "platform/globals.h"
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#include "vm/assembler.h"
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#include "vm/disassembler.h"
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#include "vm/flags.h"
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#include "vm/object_store.h"
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#include "vm/safepoint.h"
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#include "vm/snapshot.h"
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#include "vm/virtual_memory.h"
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#include "vm/visitor.h"
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#include "vm/clustered_snapshot.h"
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namespace dart {
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DEFINE_FLAG(bool, disassemble_stubs, false, "Disassemble generated stubs.");
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StubEntry* StubCode::entries_[kNumStubEntries] = {
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#define STUB_CODE_DECLARE(name) NULL,
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VM_STUB_CODE_LIST(STUB_CODE_DECLARE)
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#undef STUB_CODE_DECLARE
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};
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StubEntry::StubEntry(const Code& code)
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: code_(code.raw()),
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entry_point_(code.UncheckedEntryPoint()),
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checked_entry_point_(code.CheckedEntryPoint()),
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size_(code.Size()),
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label_(code.UncheckedEntryPoint()) {}
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// Visit all object pointers.
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void StubEntry::VisitObjectPointers(ObjectPointerVisitor* visitor) {
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ASSERT(visitor != NULL);
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visitor->VisitPointer(reinterpret_cast<RawObject**>(&code_));
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}
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#define STUB_CODE_GENERATE(name) \
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code ^= Generate("_stub_" #name, StubCode::Generate##name##Stub); \
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entries_[k##name##Index] = new StubEntry(code);
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void StubCode::InitOnce() {
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#if defined(DART_PRECOMPILED_RUNTIME)
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// Stubs will be loaded from the snapshot.
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UNREACHABLE();
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#else
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// Generate all the stubs.
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Code& code = Code::Handle();
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VM_STUB_CODE_LIST(STUB_CODE_GENERATE);
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#endif // DART_PRECOMPILED_RUNTIME
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}
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#undef STUB_CODE_GENERATE
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void StubCode::Init(Isolate* isolate) {}
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void StubCode::VisitObjectPointers(ObjectPointerVisitor* visitor) {}
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bool StubCode::HasBeenInitialized() {
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#if !defined(TARGET_ARCH_DBC)
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// Use JumpToHandler and InvokeDart as canaries.
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const StubEntry* entry_1 = StubCode::JumpToFrame_entry();
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const StubEntry* entry_2 = StubCode::InvokeDartCode_entry();
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return (entry_1 != NULL) && (entry_2 != NULL);
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#else
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return true;
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#endif
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}
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bool StubCode::InInvocationStub(uword pc) {
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#if !defined(TARGET_ARCH_DBC)
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ASSERT(HasBeenInitialized());
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uword entry = StubCode::InvokeDartCode_entry()->EntryPoint();
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uword size = StubCode::InvokeDartCodeSize();
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return (pc >= entry) && (pc < (entry + size));
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#else
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// On DBC we use a special marker PC to signify entry frame because there is
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// no such thing as invocation stub.
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return (pc & 2) != 0;
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#endif
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}
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bool StubCode::InJumpToFrameStub(uword pc) {
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#if !defined(TARGET_ARCH_DBC)
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ASSERT(HasBeenInitialized());
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uword entry = StubCode::JumpToFrame_entry()->EntryPoint();
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uword size = StubCode::JumpToFrameSize();
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return (pc >= entry) && (pc < (entry + size));
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#else
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// This stub does not exist on DBC.
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return false;
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#endif
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}
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RawCode* StubCode::GetAllocationStubForClass(const Class& cls) {
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// These stubs are not used by DBC.
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#if !defined(TARGET_ARCH_DBC)
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Thread* thread = Thread::Current();
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Zone* zone = thread->zone();
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const Error& error = Error::Handle(zone, cls.EnsureIsFinalized(thread));
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ASSERT(error.IsNull());
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if (cls.id() == kArrayCid) {
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return AllocateArray_entry()->code();
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}
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Code& stub = Code::Handle(zone, cls.allocation_stub());
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if (stub.IsNull()) {
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Assembler assembler;
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const char* name = cls.ToCString();
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StubCode::GenerateAllocationStubForClass(&assembler, cls);
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if (thread->IsMutatorThread()) {
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stub ^= Code::FinalizeCode(name, &assembler, false /* optimized */);
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// Check if background compilation thread has not already added the stub.
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if (cls.allocation_stub() == Code::null()) {
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stub.set_owner(cls);
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cls.set_allocation_stub(stub);
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}
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} else {
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// This part of stub code generation must be at a safepoint.
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// Stop mutator thread before creating the instruction object and
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// installing code.
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// Mutator thread may not run code while we are creating the
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// instruction object, since the creation of instruction object
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// changes code page access permissions (makes them temporary not
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// executable).
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{
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SafepointOperationScope safepoint_scope(thread);
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stub = cls.allocation_stub();
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// Check if stub was already generated.
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if (!stub.IsNull()) {
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return stub.raw();
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}
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// Do not Garbage collect during this stage and instead allow the
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// heap to grow.
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NoHeapGrowthControlScope no_growth_control;
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stub ^= Code::FinalizeCode(name, &assembler, false /* optimized */);
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stub.set_owner(cls);
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cls.set_allocation_stub(stub);
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}
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Isolate* isolate = thread->isolate();
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if (isolate->heap()->NeedsGarbageCollection()) {
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isolate->heap()->CollectAllGarbage();
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}
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}
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#ifndef PRODUCT
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if (FLAG_support_disassembler && FLAG_disassemble_stubs) {
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LogBlock lb;
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THR_Print("Code for allocation stub '%s': {\n", name);
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DisassembleToStdout formatter;
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stub.Disassemble(&formatter);
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THR_Print("}\n");
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const ObjectPool& object_pool = ObjectPool::Handle(stub.object_pool());
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object_pool.DebugPrint();
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}
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#endif // !PRODUCT
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}
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return stub.raw();
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#endif // !DBC
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UNIMPLEMENTED();
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return Code::null();
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}
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const StubEntry* StubCode::UnoptimizedStaticCallEntry(
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intptr_t num_args_tested) {
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// These stubs are not used by DBC.
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#if !defined(TARGET_ARCH_DBC)
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switch (num_args_tested) {
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case 0:
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return ZeroArgsUnoptimizedStaticCall_entry();
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case 1:
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return OneArgUnoptimizedStaticCall_entry();
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case 2:
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return TwoArgsUnoptimizedStaticCall_entry();
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default:
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UNIMPLEMENTED();
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return NULL;
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}
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#else
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return NULL;
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#endif
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}
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RawCode* StubCode::Generate(const char* name,
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void (*GenerateStub)(Assembler* assembler)) {
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Assembler assembler;
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GenerateStub(&assembler);
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const Code& code =
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Code::Handle(Code::FinalizeCode(name, &assembler, false /* optimized */));
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#ifndef PRODUCT
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if (FLAG_support_disassembler && FLAG_disassemble_stubs) {
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LogBlock lb;
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THR_Print("Code for stub '%s': {\n", name);
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DisassembleToStdout formatter;
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code.Disassemble(&formatter);
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THR_Print("}\n");
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const ObjectPool& object_pool = ObjectPool::Handle(code.object_pool());
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object_pool.DebugPrint();
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}
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#endif // !PRODUCT
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return code.raw();
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}
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const char* StubCode::NameOfStub(uword entry_point) {
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#define VM_STUB_CODE_TESTER(name) \
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if ((name##_entry() != NULL) && \
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(entry_point == name##_entry()->EntryPoint())) { \
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return "" #name; \
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}
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VM_STUB_CODE_LIST(VM_STUB_CODE_TESTER);
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#undef VM_STUB_CODE_TESTER
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return NULL;
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}
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} // namespace dart
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