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thread.h
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// Copyright (c) 2015, 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_THREAD_H_
#define RUNTIME_VM_THREAD_H_
#if defined(SHOULD_NOT_INCLUDE_RUNTIME)
#error "Should not include runtime"
#endif
#include "include/dart_api.h"
#include "platform/assert.h"
#include "platform/atomic.h"
#include "platform/safe_stack.h"
#include "vm/bitfield.h"
#include "vm/constants.h"
#include "vm/globals.h"
#include "vm/handles.h"
#include "vm/heap/pointer_block.h"
#include "vm/os_thread.h"
#include "vm/random.h"
#include "vm/runtime_entry_list.h"
#include "vm/thread_stack_resource.h"
#include "vm/thread_state.h"
namespace dart {
class AbstractType;
class ApiLocalScope;
class Array;
class CompilerState;
class Class;
class Code;
class Bytecode;
class Error;
class ExceptionHandlers;
class Field;
class Function;
class GrowableObjectArray;
class HandleScope;
class Heap;
class HierarchyInfo;
class Instance;
class Interpreter;
class Isolate;
class Library;
class Object;
class OSThread;
class JSONObject;
class PcDescriptors;
class RawBool;
class RawObject;
class RawCode;
class RawError;
class RawGrowableObjectArray;
class RawObjectPool;
class RawStackTrace;
class RawString;
class RuntimeEntry;
class Smi;
class StackResource;
class StackTrace;
class String;
class TimelineStream;
class TypeArguments;
class TypeParameter;
class TypeUsageInfo;
class Zone;
#define REUSABLE_HANDLE_LIST(V) \
V(AbstractType) \
V(Array) \
V(Class) \
V(Code) \
V(Bytecode) \
V(Error) \
V(ExceptionHandlers) \
V(Field) \
V(Function) \
V(GrowableObjectArray) \
V(Instance) \
V(Library) \
V(Object) \
V(PcDescriptors) \
V(Smi) \
V(String) \
V(TypeArguments) \
V(TypeParameter)
#if defined(TARGET_ARCH_DBC)
#define CACHED_VM_STUBS_LIST(V)
#else
#define CACHED_VM_STUBS_LIST(V) \
V(RawCode*, write_barrier_code_, StubCode::WriteBarrier().raw(), NULL) \
V(RawCode*, array_write_barrier_code_, StubCode::ArrayWriteBarrier().raw(), \
NULL) \
V(RawCode*, fix_callers_target_code_, StubCode::FixCallersTarget().raw(), \
NULL) \
V(RawCode*, fix_allocation_stub_code_, \
StubCode::FixAllocationStubTarget().raw(), NULL) \
V(RawCode*, invoke_dart_code_stub_, StubCode::InvokeDartCode().raw(), NULL) \
V(RawCode*, invoke_dart_code_from_bytecode_stub_, \
StubCode::InvokeDartCodeFromBytecode().raw(), NULL) \
V(RawCode*, call_to_runtime_stub_, StubCode::CallToRuntime().raw(), NULL) \
V(RawCode*, null_error_shared_without_fpu_regs_stub_, \
StubCode::NullErrorSharedWithoutFPURegs().raw(), NULL) \
V(RawCode*, null_error_shared_with_fpu_regs_stub_, \
StubCode::NullErrorSharedWithFPURegs().raw(), NULL) \
V(RawCode*, stack_overflow_shared_without_fpu_regs_stub_, \
StubCode::StackOverflowSharedWithoutFPURegs().raw(), NULL) \
V(RawCode*, stack_overflow_shared_with_fpu_regs_stub_, \
StubCode::StackOverflowSharedWithFPURegs().raw(), NULL) \
V(RawCode*, monomorphic_miss_stub_, StubCode::MonomorphicMiss().raw(), NULL) \
V(RawCode*, ic_lookup_through_code_stub_, \
StubCode::ICCallThroughCode().raw(), NULL) \
V(RawCode*, optimize_stub_, StubCode::OptimizeFunction().raw(), NULL) \
V(RawCode*, deoptimize_stub_, StubCode::Deoptimize().raw(), NULL) \
V(RawCode*, lazy_deopt_from_return_stub_, \
StubCode::DeoptimizeLazyFromReturn().raw(), NULL) \
V(RawCode*, lazy_deopt_from_throw_stub_, \
StubCode::DeoptimizeLazyFromThrow().raw(), NULL) \
V(RawCode*, slow_type_test_stub_, StubCode::SlowTypeTest().raw(), NULL) \
V(RawCode*, lazy_specialize_type_test_stub_, \
StubCode::LazySpecializeTypeTest().raw(), NULL) \
V(RawCode*, enter_safepoint_stub_, StubCode::EnterSafepoint().raw(), NULL) \
V(RawCode*, exit_safepoint_stub_, StubCode::ExitSafepoint().raw(), NULL)
#endif
#define CACHED_NON_VM_STUB_LIST(V) \
V(RawObject*, object_null_, Object::null(), NULL) \
V(RawBool*, bool_true_, Object::bool_true().raw(), NULL) \
V(RawBool*, bool_false_, Object::bool_false().raw(), NULL)
// List of VM-global objects/addresses cached in each Thread object.
// Important: constant false must immediately follow constant true.
#define CACHED_VM_OBJECTS_LIST(V) \
CACHED_NON_VM_STUB_LIST(V) \
CACHED_VM_STUBS_LIST(V)
// This assertion marks places which assume that boolean false immediate
// follows bool true in the CACHED_VM_OBJECTS_LIST
#define ASSERT_BOOL_FALSE_FOLLOWS_BOOL_TRUE() \
ASSERT((Thread::bool_true_offset() + kWordSize) == \
Thread::bool_false_offset());
#if defined(TARGET_ARCH_DBC)
#define CACHED_VM_STUBS_ADDRESSES_LIST(V)
#else
#define CACHED_VM_STUBS_ADDRESSES_LIST(V) \
V(uword, write_barrier_entry_point_, StubCode::WriteBarrier().EntryPoint(), \
0) \
V(uword, array_write_barrier_entry_point_, \
StubCode::ArrayWriteBarrier().EntryPoint(), 0) \
V(uword, call_to_runtime_entry_point_, \
StubCode::CallToRuntime().EntryPoint(), 0) \
V(uword, null_error_shared_without_fpu_regs_entry_point_, \
StubCode::NullErrorSharedWithoutFPURegs().EntryPoint(), 0) \
V(uword, null_error_shared_with_fpu_regs_entry_point_, \
StubCode::NullErrorSharedWithFPURegs().EntryPoint(), 0) \
V(uword, stack_overflow_shared_without_fpu_regs_entry_point_, \
StubCode::StackOverflowSharedWithoutFPURegs().EntryPoint(), 0) \
V(uword, stack_overflow_shared_with_fpu_regs_entry_point_, \
StubCode::StackOverflowSharedWithFPURegs().EntryPoint(), 0) \
V(uword, megamorphic_call_checked_entry_, \
StubCode::MegamorphicCall().EntryPoint(), 0) \
V(uword, monomorphic_miss_entry_, StubCode::MonomorphicMiss().EntryPoint(), \
0) \
V(uword, optimize_entry_, StubCode::OptimizeFunction().EntryPoint(), 0) \
V(uword, deoptimize_entry_, StubCode::Deoptimize().EntryPoint(), 0) \
V(uword, verify_callback_entry_, StubCode::VerifyCallback().EntryPoint(), 0)
#endif
#define CACHED_ADDRESSES_LIST(V) \
CACHED_VM_STUBS_ADDRESSES_LIST(V) \
V(uword, no_scope_native_wrapper_entry_point_, \
NativeEntry::NoScopeNativeCallWrapperEntry(), 0) \
V(uword, auto_scope_native_wrapper_entry_point_, \
NativeEntry::AutoScopeNativeCallWrapperEntry(), 0) \
V(uword, interpret_call_entry_point_, RuntimeEntry::InterpretCallEntry(), 0) \
V(RawString**, predefined_symbols_address_, Symbols::PredefinedAddress(), \
NULL) \
V(uword, double_nan_address_, reinterpret_cast<uword>(&double_nan_constant), \
0) \
V(uword, double_negate_address_, \
reinterpret_cast<uword>(&double_negate_constant), 0) \
V(uword, double_abs_address_, reinterpret_cast<uword>(&double_abs_constant), \
0) \
V(uword, float_not_address_, reinterpret_cast<uword>(&float_not_constant), \
0) \
V(uword, float_negate_address_, \
reinterpret_cast<uword>(&float_negate_constant), 0) \
V(uword, float_absolute_address_, \
reinterpret_cast<uword>(&float_absolute_constant), 0) \
V(uword, float_zerow_address_, \
reinterpret_cast<uword>(&float_zerow_constant), 0)
#define CACHED_CONSTANTS_LIST(V) \
CACHED_VM_OBJECTS_LIST(V) \
CACHED_ADDRESSES_LIST(V)
enum class ValidationPolicy {
kValidateFrames = 0,
kDontValidateFrames = 1,
};
// A VM thread; may be executing Dart code or performing helper tasks like
// garbage collection or compilation. The Thread structure associated with
// a thread is allocated by EnsureInit before entering an isolate, and destroyed
// automatically when the underlying OS thread exits. NOTE: On Windows, CleanUp
// must currently be called manually (issue 23474).
class Thread : public ThreadState {
public:
// The kind of task this thread is performing. Sampled by the profiler.
enum TaskKind {
kUnknownTask = 0x0,
kMutatorTask = 0x1,
kCompilerTask = 0x2,
kMarkerTask = 0x4,
kSweeperTask = 0x8,
kCompactorTask = 0x10,
};
// Converts a TaskKind to its corresponding C-String name.
static const char* TaskKindToCString(TaskKind kind);
~Thread();
// The currently executing thread, or NULL if not yet initialized.
static Thread* Current() {
#if defined(HAS_C11_THREAD_LOCAL)
return static_cast<Thread*>(OSThread::CurrentVMThread());
#else
BaseThread* thread = OSThread::GetCurrentTLS();
if (thread == NULL || thread->is_os_thread()) {
return NULL;
}
return static_cast<Thread*>(thread);
#endif
}
// Makes the current thread enter 'isolate'.
static bool EnterIsolate(Isolate* isolate);
// Makes the current thread exit its isolate.
static void ExitIsolate();
// A VM thread other than the main mutator thread can enter an isolate as a
// "helper" to gain limited concurrent access to the isolate. One example is
// SweeperTask (which uses the class table, which is copy-on-write).
// TODO(koda): Properly synchronize heap access to expand allowed operations.
static bool EnterIsolateAsHelper(Isolate* isolate,
TaskKind kind,
bool bypass_safepoint = false);
static void ExitIsolateAsHelper(bool bypass_safepoint = false);
// Empties the store buffer block into the isolate.
void ReleaseStoreBuffer();
void AcquireMarkingStack();
void ReleaseMarkingStack();
void SetStackLimit(uword value);
void ClearStackLimit();
// Access to the current stack limit for generated code. This may be
// overwritten with a special value to trigger interrupts.
uword stack_limit_address() const {
return reinterpret_cast<uword>(&stack_limit_);
}
static intptr_t stack_limit_offset() {
return OFFSET_OF(Thread, stack_limit_);
}
// The true stack limit for this isolate.
uword saved_stack_limit() const { return saved_stack_limit_; }
#if defined(USING_SAFE_STACK)
uword saved_safestack_limit() const { return saved_safestack_limit_; }
void set_saved_safestack_limit(uword limit) {
saved_safestack_limit_ = limit;
}
#endif
#if defined(TARGET_ARCH_DBC)
// Access to the current stack limit for DBC interpreter.
uword stack_limit() const { return stack_limit_; }
#endif
// Stack overflow flags
enum {
kOsrRequest = 0x1, // Current stack overflow caused by OSR request.
};
uword write_barrier_mask() const { return write_barrier_mask_; }
static intptr_t write_barrier_mask_offset() {
return OFFSET_OF(Thread, write_barrier_mask_);
}
static intptr_t stack_overflow_flags_offset() {
return OFFSET_OF(Thread, stack_overflow_flags_);
}
int32_t IncrementAndGetStackOverflowCount() {
return ++stack_overflow_count_;
}
#if !defined(TARGET_ARCH_DBC)
static uword stack_overflow_shared_stub_entry_point_offset(bool fpu_regs) {
return fpu_regs
? stack_overflow_shared_with_fpu_regs_entry_point_offset()
: stack_overflow_shared_without_fpu_regs_entry_point_offset();
}
#endif
static intptr_t safepoint_state_offset() {
return OFFSET_OF(Thread, safepoint_state_);
}
static intptr_t callback_code_offset() {
return OFFSET_OF(Thread, ffi_callback_code_);
}
TaskKind task_kind() const { return task_kind_; }
// Retrieves and clears the stack overflow flags. These are set by
// the generated code before the slow path runtime routine for a
// stack overflow is called.
uword GetAndClearStackOverflowFlags();
// Interrupt bits.
enum {
kVMInterrupt = 0x1, // Internal VM checks: safepoints, store buffers, etc.
kMessageInterrupt = 0x2, // An interrupt to process an out of band message.
kInterruptsMask = (kVMInterrupt | kMessageInterrupt),
};
void ScheduleInterrupts(uword interrupt_bits);
void ScheduleInterruptsLocked(uword interrupt_bits);
RawError* HandleInterrupts();
uword GetAndClearInterrupts();
bool HasScheduledInterrupts() const {
return (stack_limit_ & kInterruptsMask) != 0;
}
// Monitor corresponding to this thread.
Monitor* thread_lock() const { return &thread_lock_; }
// The reusable api local scope for this thread.
ApiLocalScope* api_reusable_scope() const { return api_reusable_scope_; }
void set_api_reusable_scope(ApiLocalScope* value) {
ASSERT(value == NULL || api_reusable_scope_ == NULL);
api_reusable_scope_ = value;
}
// The api local scope for this thread, this where all local handles
// are allocated.
ApiLocalScope* api_top_scope() const { return api_top_scope_; }
void set_api_top_scope(ApiLocalScope* value) { api_top_scope_ = value; }
void EnterApiScope();
void ExitApiScope();
// The isolate that this thread is operating on, or NULL if none.
Isolate* isolate() const { return isolate_; }
static intptr_t isolate_offset() { return OFFSET_OF(Thread, isolate_); }
bool IsMutatorThread() const;
bool CanCollectGarbage() const;
// Offset of Dart TimelineStream object.
static intptr_t dart_stream_offset() {
return OFFSET_OF(Thread, dart_stream_);
}
// Is |this| executing Dart code?
bool IsExecutingDartCode() const;
// Has |this| exited Dart code?
bool HasExitedDartCode() const;
CompilerState& compiler_state() {
ASSERT(compiler_state_ != nullptr);
return *compiler_state_;
}
HierarchyInfo* hierarchy_info() const {
ASSERT(isolate_ != NULL);
return hierarchy_info_;
}
void set_hierarchy_info(HierarchyInfo* value) {
ASSERT(isolate_ != NULL);
ASSERT((hierarchy_info_ == NULL && value != NULL) ||
(hierarchy_info_ != NULL && value == NULL));
hierarchy_info_ = value;
}
TypeUsageInfo* type_usage_info() const {
ASSERT(isolate_ != NULL);
return type_usage_info_;
}
void set_type_usage_info(TypeUsageInfo* value) {
ASSERT(isolate_ != NULL);
ASSERT((type_usage_info_ == NULL && value != NULL) ||
(type_usage_info_ != NULL && value == NULL));
type_usage_info_ = value;
}
#if !defined(DART_PRECOMPILED_RUNTIME)
Interpreter* interpreter() const { return interpreter_; }
void set_interpreter(Interpreter* value) { interpreter_ = value; }
#endif
int32_t no_callback_scope_depth() const { return no_callback_scope_depth_; }
void IncrementNoCallbackScopeDepth() {
ASSERT(no_callback_scope_depth_ < INT_MAX);
no_callback_scope_depth_ += 1;
}
void DecrementNoCallbackScopeDepth() {
ASSERT(no_callback_scope_depth_ > 0);
no_callback_scope_depth_ -= 1;
}
void StoreBufferAddObject(RawObject* obj);
void StoreBufferAddObjectGC(RawObject* obj);
#if defined(TESTING)
bool StoreBufferContains(RawObject* obj) const {
return store_buffer_block_->Contains(obj);
}
#endif
void StoreBufferBlockProcess(StoreBuffer::ThresholdPolicy policy);
static intptr_t store_buffer_block_offset() {
return OFFSET_OF(Thread, store_buffer_block_);
}
bool is_marking() const { return marking_stack_block_ != NULL; }
void MarkingStackAddObject(RawObject* obj);
void DeferredMarkingStackAddObject(RawObject* obj);
void MarkingStackBlockProcess();
void DeferredMarkingStackBlockProcess();
static intptr_t marking_stack_block_offset() {
return OFFSET_OF(Thread, marking_stack_block_);
}
uword top_exit_frame_info() const { return top_exit_frame_info_; }
void set_top_exit_frame_info(uword top_exit_frame_info) {
top_exit_frame_info_ = top_exit_frame_info;
}
static intptr_t top_exit_frame_info_offset() {
return OFFSET_OF(Thread, top_exit_frame_info_);
}
// Heap of the isolate that this thread is operating on.
Heap* heap() const { return heap_; }
static intptr_t heap_offset() { return OFFSET_OF(Thread, heap_); }
void set_top(uword value) { top_ = value; }
void set_end(uword value) { end_ = value; }
uword top() { return top_; }
uword end() { return end_; }
bool HasActiveTLAB() { return end_ > 0; }
static intptr_t top_offset() { return OFFSET_OF(Thread, top_); }
static intptr_t end_offset() { return OFFSET_OF(Thread, end_); }
bool bump_allocate() const { return bump_allocate_; }
void set_bump_allocate(bool b) { bump_allocate_ = b; }
int32_t no_safepoint_scope_depth() const {
#if defined(DEBUG)
return no_safepoint_scope_depth_;
#else
return 0;
#endif
}
void IncrementNoSafepointScopeDepth() {
#if defined(DEBUG)
ASSERT(no_safepoint_scope_depth_ < INT_MAX);
no_safepoint_scope_depth_ += 1;
#endif
}
void DecrementNoSafepointScopeDepth() {
#if defined(DEBUG)
ASSERT(no_safepoint_scope_depth_ > 0);
no_safepoint_scope_depth_ -= 1;
#endif
}
#define DEFINE_OFFSET_METHOD(type_name, member_name, expr, default_init_value) \
static intptr_t member_name##offset() { \
return OFFSET_OF(Thread, member_name); \
}
CACHED_CONSTANTS_LIST(DEFINE_OFFSET_METHOD)
#undef DEFINE_OFFSET_METHOD
#if defined(TARGET_ARCH_ARM) || defined(TARGET_ARCH_ARM64) || \
defined(TARGET_ARCH_X64)
static intptr_t write_barrier_wrappers_thread_offset(Register reg) {
ASSERT((kDartAvailableCpuRegs & (1 << reg)) != 0);
intptr_t index = 0;
for (intptr_t i = 0; i < kNumberOfCpuRegisters; ++i) {
if ((kDartAvailableCpuRegs & (1 << i)) == 0) continue;
if (i == reg) break;
++index;
}
return OFFSET_OF(Thread, write_barrier_wrappers_entry_points_) +
index * sizeof(uword);
}
static intptr_t WriteBarrierWrappersOffsetForRegister(Register reg) {
intptr_t index = 0;
for (intptr_t i = 0; i < kNumberOfCpuRegisters; ++i) {
if ((kDartAvailableCpuRegs & (1 << i)) == 0) continue;
if (i == reg) {
return index * kStoreBufferWrapperSize;
}
++index;
}
UNREACHABLE();
return 0;
}
#endif
#define DEFINE_OFFSET_METHOD(name) \
static intptr_t name##_entry_point_offset() { \
return OFFSET_OF(Thread, name##_entry_point_); \
}
RUNTIME_ENTRY_LIST(DEFINE_OFFSET_METHOD)
#undef DEFINE_OFFSET_METHOD
#define DEFINE_OFFSET_METHOD(returntype, name, ...) \
static intptr_t name##_entry_point_offset() { \
return OFFSET_OF(Thread, name##_entry_point_); \
}
LEAF_RUNTIME_ENTRY_LIST(DEFINE_OFFSET_METHOD)
#undef DEFINE_OFFSET_METHOD
RawObjectPool* global_object_pool() const { return global_object_pool_; }
void set_global_object_pool(RawObjectPool* raw_value) {
global_object_pool_ = raw_value;
}
static bool CanLoadFromThread(const Object& object);
static intptr_t OffsetFromThread(const Object& object);
static bool ObjectAtOffset(intptr_t offset, Object* object);
static intptr_t OffsetFromThread(const RuntimeEntry* runtime_entry);
#if defined(DEBUG)
// For asserts only. Has false positives when running with a simulator or
// SafeStack.
bool TopErrorHandlerIsSetJump() const;
bool TopErrorHandlerIsExitFrame() const;
#endif
uword vm_tag() const { return vm_tag_; }
void set_vm_tag(uword tag) { vm_tag_ = tag; }
static intptr_t vm_tag_offset() { return OFFSET_OF(Thread, vm_tag_); }
int64_t unboxed_int64_runtime_arg() const {
return unboxed_int64_runtime_arg_;
}
void set_unboxed_int64_runtime_arg(int64_t value) {
unboxed_int64_runtime_arg_ = value;
}
static intptr_t unboxed_int64_runtime_arg_offset() {
return OFFSET_OF(Thread, unboxed_int64_runtime_arg_);
}
RawGrowableObjectArray* pending_functions();
void clear_pending_functions();
static intptr_t global_object_pool_offset() {
return OFFSET_OF(Thread, global_object_pool_);
}
RawObject* active_exception() const { return active_exception_; }
void set_active_exception(const Object& value);
static intptr_t active_exception_offset() {
return OFFSET_OF(Thread, active_exception_);
}
RawObject* active_stacktrace() const { return active_stacktrace_; }
void set_active_stacktrace(const Object& value);
static intptr_t active_stacktrace_offset() {
return OFFSET_OF(Thread, active_stacktrace_);
}
uword resume_pc() const { return resume_pc_; }
void set_resume_pc(uword value) { resume_pc_ = value; }
static uword resume_pc_offset() { return OFFSET_OF(Thread, resume_pc_); }
RawError* sticky_error() const;
void set_sticky_error(const Error& value);
void ClearStickyError();
DART_WARN_UNUSED_RESULT RawError* StealStickyError();
RawStackTrace* async_stack_trace() const;
void set_async_stack_trace(const StackTrace& stack_trace);
void set_raw_async_stack_trace(RawStackTrace* raw_stack_trace);
void clear_async_stack_trace();
static intptr_t async_stack_trace_offset() {
return OFFSET_OF(Thread, async_stack_trace_);
}
#if defined(DEBUG)
#define REUSABLE_HANDLE_SCOPE_ACCESSORS(object) \
void set_reusable_##object##_handle_scope_active(bool value) { \
reusable_##object##_handle_scope_active_ = value; \
} \
bool reusable_##object##_handle_scope_active() const { \
return reusable_##object##_handle_scope_active_; \
}
REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_SCOPE_ACCESSORS)
#undef REUSABLE_HANDLE_SCOPE_ACCESSORS
bool IsAnyReusableHandleScopeActive() const {
#define IS_REUSABLE_HANDLE_SCOPE_ACTIVE(object) \
if (reusable_##object##_handle_scope_active_) { \
return true; \
}
REUSABLE_HANDLE_LIST(IS_REUSABLE_HANDLE_SCOPE_ACTIVE)
return false;
#undef IS_REUSABLE_HANDLE_SCOPE_ACTIVE
}
#endif // defined(DEBUG)
void ClearReusableHandles();
#define REUSABLE_HANDLE(object) \
object& object##Handle() const { return *object##_handle_; }
REUSABLE_HANDLE_LIST(REUSABLE_HANDLE)
#undef REUSABLE_HANDLE
/*
* Fields used to support safepointing a thread.
*
* - Bit 0 of the safepoint_state_ field is used to indicate if the thread is
* already at a safepoint,
* - Bit 1 of the safepoint_state_ field is used to indicate if a safepoint
* operation is requested for this thread.
* - Bit 2 of the safepoint_state_ field is used to indicate that the thread
* is blocked for the safepoint operation to complete.
*
* The safepoint execution state (described above) for a thread is stored in
* in the execution_state_ field.
* Potential execution states a thread could be in:
* kThreadInGenerated - The thread is running jitted dart/stub code.
* kThreadInVM - The thread is running VM code.
* kThreadInNative - The thread is running native code.
* kThreadInBlockedState - The thread is blocked waiting for a resource.
*/
static bool IsAtSafepoint(uint32_t state) {
return AtSafepointField::decode(state);
}
bool IsAtSafepoint() const {
return AtSafepointField::decode(safepoint_state_);
}
static uint32_t SetAtSafepoint(bool value, uint32_t state) {
return AtSafepointField::update(value, state);
}
void SetAtSafepoint(bool value) {
ASSERT(thread_lock()->IsOwnedByCurrentThread());
safepoint_state_ = AtSafepointField::update(value, safepoint_state_);
}
bool IsSafepointRequested() const {
return SafepointRequestedField::decode(safepoint_state_);
}
static uint32_t SetSafepointRequested(bool value, uint32_t state) {
return SafepointRequestedField::update(value, state);
}
uint32_t SetSafepointRequested(bool value) {
ASSERT(thread_lock()->IsOwnedByCurrentThread());
uint32_t old_state;
uint32_t new_state;
do {
old_state = safepoint_state_;
new_state = SafepointRequestedField::update(value, old_state);
} while (AtomicOperations::CompareAndSwapWord(&safepoint_state_, old_state,
new_state) != old_state);
return old_state;
}
static bool IsBlockedForSafepoint(uint32_t state) {
return BlockedForSafepointField::decode(state);
}
bool IsBlockedForSafepoint() const {
return BlockedForSafepointField::decode(safepoint_state_);
}
void SetBlockedForSafepoint(bool value) {
ASSERT(thread_lock()->IsOwnedByCurrentThread());
safepoint_state_ =
BlockedForSafepointField::update(value, safepoint_state_);
}
bool BypassSafepoints() const {
return BypassSafepointsField::decode(safepoint_state_);
}
static uint32_t SetBypassSafepoints(bool value, uint32_t state) {
return BypassSafepointsField::update(value, state);
}
enum ExecutionState {
kThreadInVM = 0,
kThreadInGenerated,
kThreadInNative,
kThreadInBlockedState
};
ExecutionState execution_state() const {
return static_cast<ExecutionState>(execution_state_);
}
void set_execution_state(ExecutionState state) {
execution_state_ = static_cast<uword>(state);
}
static intptr_t execution_state_offset() {
return OFFSET_OF(Thread, execution_state_);
}
virtual bool MayAllocateHandles() {
return (execution_state() == kThreadInVM) ||
(execution_state() == kThreadInGenerated);
}
static uword safepoint_state_unacquired() { return SetAtSafepoint(false, 0); }
static uword safepoint_state_acquired() { return SetAtSafepoint(true, 0); }
bool TryEnterSafepoint() {
uint32_t new_state = SetAtSafepoint(true, 0);
if (AtomicOperations::CompareAndSwapWord(&safepoint_state_, 0, new_state) !=
0) {
return false;
}
return true;
}
void EnterSafepoint() {
// First try a fast update of the thread state to indicate it is at a
// safepoint.
if (!TryEnterSafepoint()) {
// Fast update failed which means we could potentially be in the middle
// of a safepoint operation.
EnterSafepointUsingLock();
}
}
bool TryExitSafepoint() {
uint32_t old_state = SetAtSafepoint(true, 0);
if (AtomicOperations::CompareAndSwapWord(&safepoint_state_, old_state, 0) !=
old_state) {
return false;
}
return true;
}
void ExitSafepoint() {
// First try a fast update of the thread state to indicate it is not at a
// safepoint anymore.
if (!TryExitSafepoint()) {
// Fast update failed which means we could potentially be in the middle
// of a safepoint operation.
ExitSafepointUsingLock();
}
}
void CheckForSafepoint() {
if (IsSafepointRequested()) {
BlockForSafepoint();
}
}
int32_t AllocateFfiCallbackId();
void SetFfiCallbackCode(int32_t callback_id, const Code& code);
// Ensure that 'entry' points within the code of the callback identified by
// 'callback_id'. Aborts otherwise.
void VerifyCallbackIsolate(int32_t callback_id, uword entry);
Thread* next() const { return next_; }
// Visit all object pointers.
void VisitObjectPointers(ObjectPointerVisitor* visitor,
ValidationPolicy validate_frames);
bool IsValidHandle(Dart_Handle object) const;
bool IsValidLocalHandle(Dart_Handle object) const;
intptr_t CountLocalHandles() const;
int ZoneSizeInBytes() const;
void UnwindScopes(uword stack_marker);
void InitVMConstants();
uint64_t GetRandomUInt64() { return thread_random_.NextUInt64(); }
uint64_t* GetFfiMarshalledArguments(intptr_t size) {
if (ffi_marshalled_arguments_size_ < size) {
if (ffi_marshalled_arguments_size_ > 0) {
free(ffi_marshalled_arguments_);
}
ffi_marshalled_arguments_ =
reinterpret_cast<uint64_t*>(malloc(size * sizeof(uint64_t)));
}
return ffi_marshalled_arguments_;
}
#ifndef PRODUCT
void PrintJSON(JSONStream* stream) const;
#endif
private:
template <class T>
T* AllocateReusableHandle();
// Set the current compiler state and return the previous compiler state.
CompilerState* SetCompilerState(CompilerState* state) {
CompilerState* previous = compiler_state_;
compiler_state_ = state;
return previous;
}
// Accessed from generated code.
// ** This block of fields must come first! **
// For AOT cross-compilation, we rely on these members having the same offsets
// in SIMARM(IA32) and ARM, and the same offsets in SIMARM64(X64) and ARM64.
// We use only word-sized fields to avoid differences in struct packing on the
// different architectures. See also CheckOffsets in dart.cc.
uword stack_limit_;
uword stack_overflow_flags_;
uword write_barrier_mask_;
Isolate* isolate_;
Heap* heap_;
uword top_;
uword end_;
uword volatile top_exit_frame_info_;
StoreBufferBlock* store_buffer_block_;
MarkingStackBlock* marking_stack_block_;
MarkingStackBlock* deferred_marking_stack_block_;
uword volatile vm_tag_;
RawStackTrace* async_stack_trace_;
// Memory location dedicated for passing unboxed int64 values from
// generated code to runtime.
// TODO(dartbug.com/33549): Clean this up when unboxed values
// could be passed as arguments.
ALIGN8 int64_t unboxed_int64_runtime_arg_;
// State that is cached in the TLS for fast access in generated code.
#define DECLARE_MEMBERS(type_name, member_name, expr, default_init_value) \
type_name member_name;
CACHED_CONSTANTS_LIST(DECLARE_MEMBERS)
#undef DECLARE_MEMBERS
#define DECLARE_MEMBERS(name) uword name##_entry_point_;
RUNTIME_ENTRY_LIST(DECLARE_MEMBERS)
#undef DECLARE_MEMBERS
#define DECLARE_MEMBERS(returntype, name, ...) uword name##_entry_point_;
LEAF_RUNTIME_ENTRY_LIST(DECLARE_MEMBERS)
#undef DECLARE_MEMBERS
#if defined(TARGET_ARCH_ARM) || defined(TARGET_ARCH_ARM64) || \
defined(TARGET_ARCH_X64)
uword write_barrier_wrappers_entry_points_[kNumberOfDartAvailableCpuRegs];
#endif
// JumpToExceptionHandler state:
RawObject* active_exception_;
RawObject* active_stacktrace_;
RawObjectPool* global_object_pool_;
uword resume_pc_;
uword execution_state_;
uword safepoint_state_;
RawGrowableObjectArray* ffi_callback_code_;
// ---- End accessed from generated code. ----
// The layout of Thread object up to this point should not depend
// on DART_PRECOMPILED_RUNTIME, as it is accessed from generated code.
// The code is generated without DART_PRECOMPILED_RUNTIME, but used with
// DART_PRECOMPILED_RUNTIME.
TaskKind task_kind_;
TimelineStream* dart_stream_;
mutable Monitor thread_lock_;
ApiLocalScope* api_reusable_scope_;
ApiLocalScope* api_top_scope_;
int32_t no_callback_scope_depth_;
#if defined(DEBUG)
int32_t no_safepoint_scope_depth_;
#endif
VMHandles reusable_handles_;
uword saved_stack_limit_;
intptr_t defer_oob_messages_count_;
uint16_t deferred_interrupts_mask_;
uint16_t deferred_interrupts_;
int32_t stack_overflow_count_;
bool bump_allocate_;
// Compiler state:
CompilerState* compiler_state_ = nullptr;
HierarchyInfo* hierarchy_info_;
TypeUsageInfo* type_usage_info_;
RawGrowableObjectArray* pending_functions_;
RawError* sticky_error_;
Random thread_random_;
intptr_t ffi_marshalled_arguments_size_ = 0;
uint64_t* ffi_marshalled_arguments_;
// Reusable handles support.
#define REUSABLE_HANDLE_FIELDS(object) object* object##_handle_;
REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_FIELDS)
#undef REUSABLE_HANDLE_FIELDS
#if defined(DEBUG)
#define REUSABLE_HANDLE_SCOPE_VARIABLE(object) \
bool reusable_##object##_handle_scope_active_;
REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_SCOPE_VARIABLE);
#undef REUSABLE_HANDLE_SCOPE_VARIABLE
#endif // defined(DEBUG)
class AtSafepointField : public BitField<uint32_t, bool, 0, 1> {};
class SafepointRequestedField : public BitField<uint32_t, bool, 1, 1> {};
class BlockedForSafepointField : public BitField<uint32_t, bool, 2, 1> {};
class BypassSafepointsField : public BitField<uint32_t, bool, 3, 1> {};
#if defined(USING_SAFE_STACK)
uword saved_safestack_limit_;
#endif
#if !defined(DART_PRECOMPILED_RUNTIME)
Interpreter* interpreter_;
#endif
Thread* next_; // Used to chain the thread structures in an isolate.
explicit Thread(Isolate* isolate);
void StoreBufferRelease(
StoreBuffer::ThresholdPolicy policy = StoreBuffer::kCheckThreshold);
void StoreBufferAcquire();
void MarkingStackRelease();
void MarkingStackAcquire();
void DeferredMarkingStackRelease();
void DeferredMarkingStackAcquire();
void set_safepoint_state(uint32_t value) { safepoint_state_ = value; }
void EnterSafepointUsingLock();
void ExitSafepointUsingLock();
void BlockForSafepoint();
static void SetCurrent(Thread* current) { OSThread::SetCurrentTLS(current); }
void DeferOOBMessageInterrupts();
void RestoreOOBMessageInterrupts();
#define REUSABLE_FRIEND_DECLARATION(name) \
friend class Reusable##name##HandleScope;
REUSABLE_HANDLE_LIST(REUSABLE_FRIEND_DECLARATION)
#undef REUSABLE_FRIEND_DECLARATION
friend class ApiZone;
friend class Interpreter;
friend class InterruptChecker;
friend class Isolate;
friend class IsolateTestHelper;
friend class NoOOBMessageScope;
friend class Simulator;
friend class StackZone;
friend class ThreadRegistry;
friend class CompilerState;
DISALLOW_COPY_AND_ASSIGN(Thread);
};
#if defined(HOST_OS_WINDOWS)
// Clears the state of the current thread and frees the allocation.
void WindowsThreadCleanUp();
#endif
// Disable thread interrupts.
class DisableThreadInterruptsScope : public StackResource {
public:
explicit DisableThreadInterruptsScope(Thread* thread);
~DisableThreadInterruptsScope();
};
// Within a NoSafepointScope, the thread must not reach any safepoint. Used
// around code that manipulates raw object pointers directly without handles.
#if defined(DEBUG)
class NoSafepointScope : public ThreadStackResource {
public:
explicit NoSafepointScope(Thread* thread = nullptr)
: ThreadStackResource(thread != nullptr ? thread : Thread::Current()) {
this->thread()->IncrementNoSafepointScopeDepth();
}