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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.
#ifndef VM_STUB_CODE_H_
#define VM_STUB_CODE_H_
#include "vm/allocation.h"
#include "vm/assembler.h"
namespace dart {
// Forward declarations.
class Code;
class Isolate;
class ObjectPointerVisitor;
class RawCode;
class SnapshotReader;
class SnapshotWriter;
// List of stubs created in the VM isolate, these stubs are shared by different
// isolates running in this dart process.
#define VM_STUB_CODE_LIST(V) \
V(GetStackPointer) \
V(JumpToExceptionHandler) \
V(UpdateStoreBuffer) \
V(PrintStopMessage) \
V(CallToRuntime) \
V(LazyCompile) \
V(CallBootstrapCFunction) \
V(CallNativeCFunction) \
V(FixCallersTarget) \
V(CallStaticFunction) \
V(OptimizeFunction) \
V(InvokeDartCode) \
V(DebugStepCheck) \
V(MegamorphicLookup) \
V(FixAllocationStubTarget) \
V(Deoptimize) \
V(DeoptimizeLazy) \
V(UnoptimizedIdenticalWithNumberCheck) \
V(OptimizedIdenticalWithNumberCheck) \
V(ICCallBreakpoint) \
V(RuntimeCallBreakpoint) \
V(AllocateArray) \
V(AllocateContext) \
V(OneArgCheckInlineCache) \
V(TwoArgsCheckInlineCache) \
V(SmiAddInlineCache) \
V(SmiSubInlineCache) \
V(SmiEqualInlineCache) \
V(UnaryRangeCollectingInlineCache) \
V(BinaryRangeCollectingInlineCache) \
V(OneArgOptimizedCheckInlineCache) \
V(TwoArgsOptimizedCheckInlineCache) \
V(ZeroArgsUnoptimizedStaticCall) \
V(OneArgUnoptimizedStaticCall) \
V(TwoArgsUnoptimizedStaticCall) \
V(Subtype1TestCache) \
V(Subtype2TestCache) \
V(Subtype3TestCache) \
// 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 StubEntry is used to describe stub methods generated in dart to
// abstract out common code executed from generated dart code.
class StubEntry {
explicit StubEntry(const Code& code);
~StubEntry() {}
const ExternalLabel& label() const { return label_; }
uword EntryPoint() const { return entry_point_; }
RawCode* code() const { return code_; }
intptr_t Size() const { return size_; }
// Visit all object pointers.
void VisitObjectPointers(ObjectPointerVisitor* visitor);
RawCode* code_;
uword entry_point_;
intptr_t size_;
ExternalLabel label_;
// 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 InitOnce();
static void ReadFrom(SnapshotReader* reader);
static void WriteTo(SnapshotWriter* writer);
// Generate all stubs which are generated on a per isolate basis as they
// have embedded objects which are isolate specific.
static void Init(Isolate* isolate);
static void VisitObjectPointers(ObjectPointerVisitor* visitor);
// 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 exception handler stub.
static bool InJumpToExceptionHandlerStub(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 StubEntry* name##_entry() { \
return name##_entry_; \
} \
static intptr_t name##Size() { \
return name##_entry()->Size(); \
static RawCode* GetAllocationStubForClass(const Class& cls);
static const StubEntry* UnoptimizedStaticCallEntry(intptr_t num_args_tested);
static const intptr_t kNoInstantiator = 0;
static void EmitMegamorphicLookup(
Assembler*, Register recv, Register cache, Register target);
friend class MegamorphicCacheTable;
static const intptr_t kStubCodeSize = 4 * KB;
#define STUB_CODE_GENERATE(name) \
static void Generate##name##Stub(Assembler* assembler);
#define STUB_CODE_ENTRY(name) \
static StubEntry* name##_entry_;
enum RangeCollectionMode {
// Generate the stub and finalize the generated code into the stub
// code executable area.
static RawCode* Generate(const char* name,
void (*GenerateStub)(Assembler* assembler));
static void GenerateMegamorphicMissStub(Assembler* assembler);
static void GenerateAllocationStubForClass(Assembler* assembler,
const Class& cls);
static void GenerateNArgsCheckInlineCacheStub(
Assembler* assembler,
intptr_t num_args,
const RuntimeEntry& handle_ic_miss,
Token::Kind kind,
RangeCollectionMode range_collection_mode,
bool optimized = false);
static void GenerateUsageCounterIncrement(Assembler* assembler,
Register temp_reg);
static void GenerateOptimizedUsageCounterIncrement(Assembler* assembler);
enum DeoptStubKind {
} // namespace dart
#endif // VM_STUB_CODE_H_