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// Copyright (c) 2011, 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.
#include "vm/allocation.h"
#include "vm/compiler/runtime_api.h"
#include "vm/object.h"
#include "vm/stub_code_list.h"
#include "vm/compiler/assembler/assembler.h"
#include "vm/compiler/stub_code_compiler.h"
#endif // !defined(DART_PRECOMPILED_RUNTIME)
namespace dart {
// Forward declarations.
class Code;
class Isolate;
class ObjectPointerVisitor;
class SnapshotReader;
class SnapshotWriter;
DECLARE_FLAG(bool, disassemble_stubs);
// Is it permitted for the stubs above to refer to Object::null(), which is
// allocated in the VM isolate and shared across all isolates.
// However, in cases where a simple GC-safe placeholder is needed on the stack,
// using Smi 0 instead of Object::null() is slightly more efficient, since a Smi
// does not require relocation.
// class StubCode is used to maintain the lifecycle of stubs.
class StubCode : public AllStatic {
// Generate all stubs which are shared across all isolates, this is done
// only once and the stub code resides in the vm_isolate heap.
static void Init();
static void Cleanup();
// Returns true if stub code has been initialized.
static bool HasBeenInitialized() {
return initialized_.load(std::memory_order_acquire);
static void InitializationDone() {, std::memory_order_release);
// Check if specified pc is in the dart invocation stub used for
// transitioning into dart code.
static bool InInvocationStub(uword pc);
// Check if the specified pc is in the jump to frame stub.
static bool InJumpToFrameStub(uword pc);
// Returns NULL if no stub found.
static const char* NameOfStub(uword entry_point);
// Define the shared stub code accessors.
#define STUB_CODE_ACCESSOR(name) \
static const Code& name() { return *entries_[k##name##Index].code; } \
static intptr_t name##Size() { return name().Size(); }
static CodePtr GetAllocationStubForClass(const Class& cls);
static CodePtr GetAllocationStubForTypedData(classid_t class_id);
#endif // !defined(DART_PRECOMPILED_RUNTIME)
#if !defined(TARGET_ARCH_IA32)
static CodePtr GetBuildGenericMethodExtractorStub(
compiler::ObjectPoolBuilder* pool) {
return GetBuildMethodExtractorStub(pool, /*generic=*/true);
static CodePtr GetBuildNonGenericMethodExtractorStub(
compiler::ObjectPoolBuilder* pool) {
return GetBuildMethodExtractorStub(pool, /*generic=*/false);
// Generate the stub and finalize the generated code into the stub
// code executable area.
static CodePtr Generate(const char* name,
compiler::ObjectPoolBuilder* object_pool_builder,
void (*GenerateStub)(compiler::Assembler* assembler));
#endif // !defined(DART_PRECOMPILED_RUNTIME)
static const Code& UnoptimizedStaticCallEntry(intptr_t num_args_tested);
static const char* NameAt(intptr_t index) { return entries_[index].name; }
static const Code& EntryAt(intptr_t index) { return *(entries_[index].code); }
static void EntryAtPut(intptr_t index, Code* entry) {
ASSERT(entries_[index].code == nullptr);
entries_[index].code = entry;
static intptr_t NumEntries() { return kNumStubEntries; }
#define GENERATE_STUB(name) \
static CodePtr BuildIsolateSpecific##name##Stub( \
compiler::ObjectPoolBuilder* opw) { \
return StubCode::Generate( \
"_iso_stub_" #name, opw, \
compiler::StubCodeCompiler::Generate##name##Stub); \
#endif // !defined(DART_PRECOMPILED_RUNTIME)
friend class MegamorphicCacheTable;
static CodePtr GetBuildMethodExtractorStub(compiler::ObjectPoolBuilder* pool,
bool generic);
enum {
#define STUB_CODE_ENTRY(name) k##name##Index,
struct StubCodeEntry {
Code* code;
const char* name;
void (*generator)(compiler::Assembler* assembler);
static StubCodeEntry entries_[kNumStubEntries];
static AcqRelAtomic<bool> initialized_;
} // namespace dart