| // Copyright (c) 2016, 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/object.h" |
| |
| #include "platform/unaligned.h" |
| #include "vm/code_patcher.h" |
| #include "vm/hash_table.h" |
| #include "vm/isolate_reload.h" |
| #include "vm/log.h" |
| #include "vm/object_store.h" |
| #include "vm/resolver.h" |
| #include "vm/stub_code.h" |
| #include "vm/symbols.h" |
| |
| namespace dart { |
| |
| #if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME) |
| |
| DECLARE_FLAG(bool, trace_reload); |
| DECLARE_FLAG(bool, trace_reload_verbose); |
| DECLARE_FLAG(bool, two_args_smi_icd); |
| |
| void CallSiteResetter::ZeroEdgeCounters(const Function& function) { |
| ic_data_array_ = function.ic_data_array(); |
| if (ic_data_array_.IsNull()) { |
| return; |
| } |
| ASSERT(ic_data_array_.Length() > 0); |
| edge_counters_ ^= ic_data_array_.At(0); |
| if (edge_counters_.IsNull()) { |
| return; |
| } |
| // Fill edge counters array with zeros. |
| for (intptr_t i = 0; i < edge_counters_.Length(); i++) { |
| edge_counters_.SetAt(i, Object::smi_zero()); |
| } |
| } |
| |
| CallSiteResetter::CallSiteResetter(Zone* zone) |
| : zone_(zone), |
| instrs_(Instructions::Handle(zone)), |
| pool_(ObjectPool::Handle(zone)), |
| object_(Object::Handle(zone)), |
| name_(String::Handle(zone)), |
| new_cls_(Class::Handle(zone)), |
| new_lib_(Library::Handle(zone)), |
| new_function_(Function::Handle(zone)), |
| new_field_(Field::Handle(zone)), |
| entries_(Array::Handle(zone)), |
| old_target_(Function::Handle(zone)), |
| new_target_(Function::Handle(zone)), |
| caller_(Function::Handle(zone)), |
| args_desc_array_(Array::Handle(zone)), |
| ic_data_array_(Array::Handle(zone)), |
| edge_counters_(Array::Handle(zone)), |
| descriptors_(PcDescriptors::Handle(zone)), |
| ic_data_(ICData::Handle(zone)) {} |
| |
| void CallSiteResetter::ResetCaches(const Code& code) { |
| // Iterate over the Code's object pool and reset all ICDatas and |
| // SubtypeTestCaches. |
| #ifdef TARGET_ARCH_IA32 |
| // IA32 does not have an object pool, but, we can iterate over all |
| // embedded objects by using the variable length data section. |
| if (!code.is_alive()) { |
| return; |
| } |
| instrs_ = code.instructions(); |
| ASSERT(!instrs_.IsNull()); |
| uword base_address = instrs_.PayloadStart(); |
| intptr_t offsets_length = code.pointer_offsets_length(); |
| const int32_t* offsets = code.untag()->data(); |
| for (intptr_t i = 0; i < offsets_length; i++) { |
| int32_t offset = offsets[i]; |
| ObjectPtr* object_ptr = reinterpret_cast<ObjectPtr*>(base_address + offset); |
| ObjectPtr raw_object = LoadUnaligned(object_ptr); |
| if (!raw_object->IsHeapObject()) { |
| continue; |
| } |
| object_ = raw_object; |
| if (object_.IsICData()) { |
| Reset(ICData::Cast(object_)); |
| } else if (object_.IsSubtypeTestCache()) { |
| SubtypeTestCache::Cast(object_).Reset(); |
| } |
| } |
| #else |
| pool_ = code.object_pool(); |
| ASSERT(!pool_.IsNull()); |
| ResetCaches(pool_); |
| #endif |
| } |
| |
| static void FindICData(const Array& ic_data_array, |
| intptr_t deopt_id, |
| ICData* ic_data) { |
| // ic_data_array is sorted because of how it is constructed in |
| // Function::SaveICDataMap. |
| intptr_t lo = 1; |
| intptr_t hi = ic_data_array.Length() - 1; |
| while (lo <= hi) { |
| intptr_t mid = (hi - lo + 1) / 2 + lo; |
| ASSERT(mid >= lo); |
| ASSERT(mid <= hi); |
| *ic_data ^= ic_data_array.At(mid); |
| if (ic_data->deopt_id() == deopt_id) { |
| return; |
| } else if (ic_data->deopt_id() > deopt_id) { |
| hi = mid - 1; |
| } else { |
| lo = mid + 1; |
| } |
| } |
| FATAL1("Missing deopt id %" Pd "\n", deopt_id); |
| } |
| |
| void CallSiteResetter::ResetSwitchableCalls(const Code& code) { |
| if (code.is_optimized()) { |
| return; // No switchable calls in optimized code. |
| } |
| |
| object_ = code.owner(); |
| if (!object_.IsFunction()) { |
| return; // No switchable calls in stub code. |
| } |
| const Function& function = Function::Cast(object_); |
| |
| if (function.kind() == UntaggedFunction::kIrregexpFunction) { |
| // Regex matchers do not support breakpoints or stepping, and they only call |
| // core library functions that cannot change due to reload. As a performance |
| // optimization, avoid this matching of ICData to PCs for these functions' |
| // large number of instance calls. |
| ASSERT(!function.is_debuggable()); |
| return; |
| } |
| |
| ic_data_array_ = function.ic_data_array(); |
| if (ic_data_array_.IsNull()) { |
| // The megamorphic miss stub and some recognized function doesn't populate |
| // their ic_data_array. Check this only happens for functions without IC |
| // calls. |
| #if defined(DEBUG) |
| descriptors_ = code.pc_descriptors(); |
| PcDescriptors::Iterator iter(descriptors_, UntaggedPcDescriptors::kIcCall); |
| while (iter.MoveNext()) { |
| FATAL1("%s has IC calls but no ic_data_array\n", object_.ToCString()); |
| } |
| #endif |
| return; |
| } |
| |
| descriptors_ = code.pc_descriptors(); |
| PcDescriptors::Iterator iter(descriptors_, UntaggedPcDescriptors::kIcCall); |
| while (iter.MoveNext()) { |
| uword pc = code.PayloadStart() + iter.PcOffset(); |
| CodePatcher::GetInstanceCallAt(pc, code, &object_); |
| // This check both avoids unnecessary patching to reduce log spam and |
| // prevents patching over breakpoint stubs. |
| if (!object_.IsICData()) { |
| FindICData(ic_data_array_, iter.DeoptId(), &ic_data_); |
| ASSERT(ic_data_.rebind_rule() == ICData::kInstance); |
| ASSERT(ic_data_.NumArgsTested() == 1); |
| const Code& stub = |
| ic_data_.is_tracking_exactness() |
| ? StubCode::OneArgCheckInlineCacheWithExactnessCheck() |
| : StubCode::OneArgCheckInlineCache(); |
| CodePatcher::PatchInstanceCallAt(pc, code, ic_data_, stub); |
| if (FLAG_trace_ic) { |
| OS::PrintErr("Instance call at %" Px |
| " resetting to polymorphic dispatch, %s\n", |
| pc, ic_data_.ToCString()); |
| } |
| } |
| } |
| } |
| |
| void CallSiteResetter::ResetCaches(const ObjectPool& pool) { |
| for (intptr_t i = 0; i < pool.Length(); i++) { |
| ObjectPool::EntryType entry_type = pool.TypeAt(i); |
| if (entry_type != ObjectPool::EntryType::kTaggedObject) { |
| continue; |
| } |
| object_ = pool.ObjectAt(i); |
| if (object_.IsICData()) { |
| Reset(ICData::Cast(object_)); |
| } else if (object_.IsSubtypeTestCache()) { |
| SubtypeTestCache::Cast(object_).Reset(); |
| } |
| } |
| } |
| |
| void Class::CopyStaticFieldValues(ProgramReloadContext* reload_context, |
| const Class& old_cls) const { |
| // We only update values for non-enum classes. |
| const bool update_values = !is_enum_class(); |
| |
| const Array& old_field_list = Array::Handle(old_cls.fields()); |
| Field& old_field = Field::Handle(); |
| String& old_name = String::Handle(); |
| |
| const Array& field_list = Array::Handle(fields()); |
| Field& field = Field::Handle(); |
| String& name = String::Handle(); |
| |
| for (intptr_t i = 0; i < field_list.Length(); i++) { |
| field = Field::RawCast(field_list.At(i)); |
| name = field.name(); |
| // Find the corresponding old field, if it exists, and migrate |
| // over the field value. |
| for (intptr_t j = 0; j < old_field_list.Length(); j++) { |
| old_field = Field::RawCast(old_field_list.At(j)); |
| old_name = old_field.name(); |
| if (name.Equals(old_name)) { |
| if (field.is_static()) { |
| // We only copy values if requested and if the field is not a const |
| // field. We let const fields be updated with a reload. |
| if (update_values && !field.is_const()) { |
| // Make new field point to the old field value so that both |
| // old and new code see and update same value. |
| reload_context->isolate_group()->FreeStaticField(field); |
| field.set_field_id_unsafe(old_field.field_id()); |
| } |
| reload_context->AddStaticFieldMapping(old_field, field); |
| } else { |
| if (old_field.needs_load_guard()) { |
| ASSERT(!old_field.is_unboxing_candidate()); |
| field.set_needs_load_guard(true); |
| field.set_is_unboxing_candidate_unsafe(false); |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| void Class::CopyCanonicalConstants(const Class& old_cls) const { |
| if (is_enum_class()) { |
| // We do not copy enum classes's canonical constants because we explicitly |
| // become the old enum values to the new enum values. |
| return; |
| } |
| #if defined(DEBUG) |
| { |
| // Class has no canonical constants allocated. |
| const Array& my_constants = Array::Handle(constants()); |
| ASSERT(my_constants.IsNull() || my_constants.Length() == 0); |
| } |
| #endif // defined(DEBUG). |
| // Copy old constants into new class. |
| const Array& old_constants = Array::Handle(old_cls.constants()); |
| if (old_constants.IsNull() || old_constants.Length() == 0) { |
| return; |
| } |
| TIR_Print("Copied %" Pd " canonical constants for class `%s`\n", |
| old_constants.Length(), ToCString()); |
| set_constants(old_constants); |
| } |
| |
| void Class::CopyDeclarationType(const Class& old_cls) const { |
| const Type& old_declaration_type = Type::Handle(old_cls.declaration_type()); |
| if (old_declaration_type.IsNull()) { |
| return; |
| } |
| set_declaration_type(old_declaration_type); |
| } |
| |
| class EnumMapTraits { |
| public: |
| static bool ReportStats() { return false; } |
| static const char* Name() { return "EnumMapTraits"; } |
| |
| static bool IsMatch(const Object& a, const Object& b) { |
| return a.ptr() == b.ptr(); |
| } |
| |
| static uword Hash(const Object& obj) { |
| ASSERT(obj.IsString()); |
| return String::Cast(obj).Hash(); |
| } |
| }; |
| |
| // Given an old enum class, add become mappings from old values to new values. |
| // Some notes about how we reload enums below: |
| // |
| // When an enum is reloaded the following three things can happen, possibly |
| // simultaneously. |
| // |
| // 1) A new enum value is added. |
| // This case is handled automatically. |
| // 2) Enum values are reordered. |
| // We pair old and new enums and the old enums 'become' the new ones so |
| // the ordering is always correct (i.e. enum indices match slots in values |
| // array) |
| // 3) An existing enum value is removed. |
| // Each enum class has a canonical 'deleted' enum sentinel instance. |
| // When an enum value is deleted, we 'become' all references to the 'deleted' |
| // sentinel value. The index value is -1. |
| // |
| void Class::ReplaceEnum(ProgramReloadContext* reload_context, |
| const Class& old_enum) const { |
| // We only do this for finalized enum classes. |
| ASSERT(is_enum_class()); |
| ASSERT(old_enum.is_enum_class()); |
| ASSERT(is_finalized()); |
| ASSERT(old_enum.is_finalized()); |
| |
| Zone* zone = Thread::Current()->zone(); |
| |
| Array& enum_fields = Array::Handle(zone); |
| Field& field = Field::Handle(zone); |
| String& enum_ident = String::Handle(); |
| Instance& old_enum_value = Instance::Handle(zone); |
| Instance& enum_value = Instance::Handle(zone); |
| // The E.values array. |
| Instance& old_enum_values = Instance::Handle(zone); |
| // The E.values array. |
| Instance& enum_values = Instance::Handle(zone); |
| // The E._deleted_enum_sentinel instance. |
| Instance& old_deleted_enum_sentinel = Instance::Handle(zone); |
| // The E._deleted_enum_sentinel instance. |
| Instance& deleted_enum_sentinel = Instance::Handle(zone); |
| Array& enum_map_storage = |
| Array::Handle(zone, HashTables::New<UnorderedHashMap<EnumMapTraits> >(4)); |
| ASSERT(!enum_map_storage.IsNull()); |
| |
| TIR_Print("Replacing enum `%s`\n", String::Handle(Name()).ToCString()); |
| |
| { |
| UnorderedHashMap<EnumMapTraits> enum_map(enum_map_storage.ptr()); |
| // Build a map of all enum name -> old enum instance. |
| enum_fields = old_enum.fields(); |
| for (intptr_t i = 0; i < enum_fields.Length(); i++) { |
| field = Field::RawCast(enum_fields.At(i)); |
| enum_ident = field.name(); |
| if (!field.is_static()) { |
| // Enum instances are only held in static fields. |
| continue; |
| } |
| ASSERT(field.is_const()); |
| if (enum_ident.Equals(Symbols::Values())) { |
| old_enum_values = Instance::RawCast(field.StaticConstFieldValue()); |
| // Non-enum instance. |
| continue; |
| } |
| if (enum_ident.Equals(Symbols::_DeletedEnumSentinel())) { |
| old_deleted_enum_sentinel = |
| Instance::RawCast(field.StaticConstFieldValue()); |
| // Non-enum instance. |
| continue; |
| } |
| old_enum_value = Instance::RawCast(field.StaticConstFieldValue()); |
| |
| ASSERT(!old_enum_value.IsNull()); |
| VTIR_Print("Element %s being added to mapping\n", enum_ident.ToCString()); |
| bool update = enum_map.UpdateOrInsert(enum_ident, old_enum_value); |
| VTIR_Print("Element %s added to mapping\n", enum_ident.ToCString()); |
| ASSERT(!update); |
| } |
| // The storage given to the map may have been reallocated, remember the new |
| // address. |
| enum_map_storage = enum_map.Release().ptr(); |
| } |
| |
| bool enums_deleted = false; |
| { |
| UnorderedHashMap<EnumMapTraits> enum_map(enum_map_storage.ptr()); |
| // Add a become mapping from the old instances to the new instances. |
| enum_fields = fields(); |
| for (intptr_t i = 0; i < enum_fields.Length(); i++) { |
| field = Field::RawCast(enum_fields.At(i)); |
| enum_ident = field.name(); |
| if (!field.is_static()) { |
| // Enum instances are only held in static fields. |
| continue; |
| } |
| ASSERT(field.is_const()); |
| if (enum_ident.Equals(Symbols::Values())) { |
| enum_values = Instance::RawCast(field.StaticConstFieldValue()); |
| // Non-enum instance. |
| continue; |
| } |
| if (enum_ident.Equals(Symbols::_DeletedEnumSentinel())) { |
| deleted_enum_sentinel = |
| Instance::RawCast(field.StaticConstFieldValue()); |
| // Non-enum instance. |
| continue; |
| } |
| enum_value = Instance::RawCast(field.StaticConstFieldValue()); |
| |
| ASSERT(!enum_value.IsNull()); |
| old_enum_value ^= enum_map.GetOrNull(enum_ident); |
| if (old_enum_value.IsNull()) { |
| VTIR_Print("New element %s was not found in mapping\n", |
| enum_ident.ToCString()); |
| } else { |
| VTIR_Print("Adding element `%s` to become mapping\n", |
| enum_ident.ToCString()); |
| bool removed = enum_map.Remove(enum_ident); |
| ASSERT(removed); |
| reload_context->AddEnumBecomeMapping(old_enum_value, enum_value); |
| } |
| } |
| enums_deleted = enum_map.NumOccupied() > 0; |
| // The storage given to the map may have been reallocated, remember the new |
| // address. |
| enum_map_storage = enum_map.Release().ptr(); |
| } |
| |
| // Map the old E.values array to the new E.values array. |
| ASSERT(!old_enum_values.IsNull()); |
| ASSERT(!enum_values.IsNull()); |
| reload_context->AddEnumBecomeMapping(old_enum_values, enum_values); |
| |
| // Map the old E._deleted_enum_sentinel to the new E._deleted_enum_sentinel. |
| ASSERT(!old_deleted_enum_sentinel.IsNull()); |
| ASSERT(!deleted_enum_sentinel.IsNull()); |
| reload_context->AddEnumBecomeMapping(old_deleted_enum_sentinel, |
| deleted_enum_sentinel); |
| |
| if (enums_deleted) { |
| // Map all deleted enums to the deleted enum sentinel value. |
| // TODO(johnmccutchan): Add this to the reload 'notices' list. |
| VTIR_Print( |
| "The following enum values were deleted from %s and will become the " |
| "deleted enum sentinel:\n", |
| old_enum.ToCString()); |
| UnorderedHashMap<EnumMapTraits> enum_map(enum_map_storage.ptr()); |
| UnorderedHashMap<EnumMapTraits>::Iterator it(&enum_map); |
| while (it.MoveNext()) { |
| const intptr_t entry = it.Current(); |
| enum_ident = String::RawCast(enum_map.GetKey(entry)); |
| ASSERT(!enum_ident.IsNull()); |
| old_enum_value ^= enum_map.GetOrNull(enum_ident); |
| VTIR_Print("Element `%s` was deleted\n", enum_ident.ToCString()); |
| reload_context->AddEnumBecomeMapping(old_enum_value, |
| deleted_enum_sentinel); |
| } |
| enum_map.Release(); |
| } |
| } |
| |
| void Class::PatchFieldsAndFunctions() const { |
| // Move all old functions and fields to a patch class so that they |
| // still refer to their original script. |
| const PatchClass& patch = |
| PatchClass::Handle(PatchClass::New(*this, Script::Handle(script()))); |
| ASSERT(!patch.IsNull()); |
| const Library& lib = Library::Handle(library()); |
| patch.set_library_kernel_data(ExternalTypedData::Handle(lib.kernel_data())); |
| patch.set_library_kernel_offset(lib.kernel_offset()); |
| |
| const Array& funcs = Array::Handle(current_functions()); |
| Function& func = Function::Handle(); |
| Object& owner = Object::Handle(); |
| for (intptr_t i = 0; i < funcs.Length(); i++) { |
| func = Function::RawCast(funcs.At(i)); |
| if ((func.token_pos() == TokenPosition::kMinSource) || |
| func.IsClosureFunction()) { |
| // Eval functions do not need to have their script updated. |
| // |
| // Closure functions refer to the parent's script which we can |
| // rely on being updated for us, if necessary. |
| continue; |
| } |
| |
| // If the source for this function is already patched, leave it alone. |
| owner = func.RawOwner(); |
| ASSERT(!owner.IsNull()); |
| if (!owner.IsPatchClass()) { |
| ASSERT(owner.ptr() == this->ptr()); |
| func.set_owner(patch); |
| } |
| } |
| |
| Thread* thread = Thread::Current(); |
| SafepointWriteRwLocker ml(thread, thread->isolate_group()->program_lock()); |
| const Array& field_list = Array::Handle(fields()); |
| Field& field = Field::Handle(); |
| for (intptr_t i = 0; i < field_list.Length(); i++) { |
| field = Field::RawCast(field_list.At(i)); |
| owner = field.RawOwner(); |
| ASSERT(!owner.IsNull()); |
| if (!owner.IsPatchClass()) { |
| ASSERT(owner.ptr() == this->ptr()); |
| field.set_owner(patch); |
| } |
| field.ForceDynamicGuardedCidAndLength(); |
| } |
| } |
| |
| void Class::MigrateImplicitStaticClosures(ProgramReloadContext* irc, |
| const Class& new_cls) const { |
| const Array& funcs = Array::Handle(current_functions()); |
| Thread* thread = Thread::Current(); |
| Function& old_func = Function::Handle(); |
| String& selector = String::Handle(); |
| Function& new_func = Function::Handle(); |
| Instance& old_closure = Instance::Handle(); |
| Instance& new_closure = Instance::Handle(); |
| for (intptr_t i = 0; i < funcs.Length(); i++) { |
| old_func ^= funcs.At(i); |
| if (old_func.is_static() && old_func.HasImplicitClosureFunction()) { |
| selector = old_func.name(); |
| new_func = Resolver::ResolveFunction(thread->zone(), new_cls, selector); |
| if (!new_func.IsNull() && new_func.is_static()) { |
| old_func = old_func.ImplicitClosureFunction(); |
| old_closure = old_func.ImplicitStaticClosure(); |
| new_func = new_func.ImplicitClosureFunction(); |
| new_closure = new_func.ImplicitStaticClosure(); |
| if (old_closure.IsCanonical()) { |
| new_closure.SetCanonical(); |
| } |
| irc->AddBecomeMapping(old_closure, new_closure); |
| } |
| } |
| } |
| } |
| |
| class EnumClassConflict : public ClassReasonForCancelling { |
| public: |
| EnumClassConflict(Zone* zone, const Class& from, const Class& to) |
| : ClassReasonForCancelling(zone, from, to) {} |
| |
| StringPtr ToString() { |
| return String::NewFormatted( |
| from_.is_enum_class() |
| ? "Enum class cannot be redefined to be a non-enum class: %s" |
| : "Class cannot be redefined to be a enum class: %s", |
| from_.ToCString()); |
| } |
| }; |
| |
| class EnsureFinalizedError : public ClassReasonForCancelling { |
| public: |
| EnsureFinalizedError(Zone* zone, |
| const Class& from, |
| const Class& to, |
| const Error& error) |
| : ClassReasonForCancelling(zone, from, to), error_(error) {} |
| |
| private: |
| const Error& error_; |
| |
| ErrorPtr ToError() { return error_.ptr(); } |
| |
| StringPtr ToString() { return String::New(error_.ToErrorCString()); } |
| }; |
| |
| class ConstToNonConstClass : public ClassReasonForCancelling { |
| public: |
| ConstToNonConstClass(Zone* zone, const Class& from, const Class& to) |
| : ClassReasonForCancelling(zone, from, to) {} |
| |
| private: |
| StringPtr ToString() { |
| return String::NewFormatted("Const class cannot become non-const: %s", |
| from_.ToCString()); |
| } |
| }; |
| |
| class ConstClassFieldRemoved : public ClassReasonForCancelling { |
| public: |
| ConstClassFieldRemoved(Zone* zone, const Class& from, const Class& to) |
| : ClassReasonForCancelling(zone, from, to) {} |
| |
| private: |
| StringPtr ToString() { |
| return String::NewFormatted("Const class cannot remove fields: %s", |
| from_.ToCString()); |
| } |
| }; |
| |
| class NativeFieldsConflict : public ClassReasonForCancelling { |
| public: |
| NativeFieldsConflict(Zone* zone, const Class& from, const Class& to) |
| : ClassReasonForCancelling(zone, from, to) {} |
| |
| private: |
| StringPtr ToString() { |
| return String::NewFormatted("Number of native fields changed in %s", |
| from_.ToCString()); |
| } |
| }; |
| |
| class TypeParametersChanged : public ClassReasonForCancelling { |
| public: |
| TypeParametersChanged(Zone* zone, const Class& from, const Class& to) |
| : ClassReasonForCancelling(zone, from, to) {} |
| |
| StringPtr ToString() { |
| return String::NewFormatted( |
| "Limitation: type parameters have changed for %s", from_.ToCString()); |
| } |
| |
| void AppendTo(JSONArray* array) { |
| JSONObject jsobj(array); |
| jsobj.AddProperty("type", "ReasonForCancellingReload"); |
| jsobj.AddProperty("kind", "TypeParametersChanged"); |
| jsobj.AddProperty("class", to_); |
| jsobj.AddProperty("message", |
| "Limitation: changing type parameters " |
| "does not work with hot reload."); |
| } |
| }; |
| |
| class PreFinalizedConflict : public ClassReasonForCancelling { |
| public: |
| PreFinalizedConflict(Zone* zone, const Class& from, const Class& to) |
| : ClassReasonForCancelling(zone, from, to) {} |
| |
| private: |
| StringPtr ToString() { |
| return String::NewFormatted( |
| "Original class ('%s') is prefinalized and replacement class " |
| "('%s') is not ", |
| from_.ToCString(), to_.ToCString()); |
| } |
| }; |
| |
| class InstanceSizeConflict : public ClassReasonForCancelling { |
| public: |
| InstanceSizeConflict(Zone* zone, const Class& from, const Class& to) |
| : ClassReasonForCancelling(zone, from, to) {} |
| |
| private: |
| StringPtr ToString() { |
| return String::NewFormatted("Instance size mismatch between '%s' (%" Pd |
| ") and replacement " |
| "'%s' ( %" Pd ")", |
| from_.ToCString(), from_.host_instance_size(), |
| to_.ToCString(), to_.host_instance_size()); |
| } |
| }; |
| |
| // This is executed before iterating over the instances. |
| void Class::CheckReload(const Class& replacement, |
| ProgramReloadContext* context) const { |
| ASSERT(ProgramReloadContext::IsSameClass(*this, replacement)); |
| |
| if (!is_declaration_loaded()) { |
| // The old class hasn't been used in any meaningful way, so the VM is okay |
| // with any change. |
| return; |
| } |
| |
| // Ensure is_enum_class etc have been set. |
| replacement.EnsureDeclarationLoaded(); |
| |
| // Class cannot change enum property. |
| if (is_enum_class() != replacement.is_enum_class()) { |
| context->group_reload_context()->AddReasonForCancelling( |
| new (context->zone()) |
| EnumClassConflict(context->zone(), *this, replacement)); |
| return; |
| } |
| |
| if (is_finalized()) { |
| // Ensure the replacement class is also finalized. |
| const Error& error = |
| Error::Handle(replacement.EnsureIsFinalized(Thread::Current())); |
| if (!error.IsNull()) { |
| context->group_reload_context()->AddReasonForCancelling( |
| new (context->zone()) |
| EnsureFinalizedError(context->zone(), *this, replacement, error)); |
| return; // No reason to check other properties. |
| } |
| ASSERT(replacement.is_finalized()); |
| TIR_Print("Finalized replacement class for %s\n", ToCString()); |
| } |
| |
| if (is_finalized() && is_const() && (constants() != Array::null()) && |
| (Array::LengthOf(constants()) > 0)) { |
| // Consts can't become non-consts. |
| if (!replacement.is_const()) { |
| context->group_reload_context()->AddReasonForCancelling( |
| new (context->zone()) |
| ConstToNonConstClass(context->zone(), *this, replacement)); |
| return; |
| } |
| |
| // Consts can't lose fields. |
| bool field_removed = false; |
| const Array& old_fields = |
| Array::Handle(OffsetToFieldMap(true /* original classes */)); |
| const Array& new_fields = Array::Handle(replacement.OffsetToFieldMap()); |
| if (new_fields.Length() < old_fields.Length()) { |
| field_removed = true; |
| } else { |
| Field& old_field = Field::Handle(); |
| Field& new_field = Field::Handle(); |
| String& old_name = String::Handle(); |
| String& new_name = String::Handle(); |
| for (intptr_t i = 0, n = old_fields.Length(); i < n; i++) { |
| old_field ^= old_fields.At(i); |
| new_field ^= new_fields.At(i); |
| if (old_field.IsNull() != new_field.IsNull()) { |
| field_removed = true; |
| break; |
| } |
| if (!old_field.IsNull()) { |
| old_name = old_field.name(); |
| new_name = new_field.name(); |
| if (!old_name.Equals(new_name)) { |
| field_removed = true; |
| break; |
| } |
| } |
| } |
| } |
| if (field_removed) { |
| context->group_reload_context()->AddReasonForCancelling( |
| new (context->zone()) |
| ConstClassFieldRemoved(context->zone(), *this, replacement)); |
| return; |
| } |
| } |
| |
| // Native field count cannot change. |
| if (num_native_fields() != replacement.num_native_fields()) { |
| context->group_reload_context()->AddReasonForCancelling( |
| new (context->zone()) |
| NativeFieldsConflict(context->zone(), *this, replacement)); |
| return; |
| } |
| |
| // Just checking. |
| ASSERT(is_enum_class() == replacement.is_enum_class()); |
| ASSERT(num_native_fields() == replacement.num_native_fields()); |
| |
| if (is_finalized()) { |
| if (!CanReloadFinalized(replacement, context)) return; |
| } |
| if (is_prefinalized()) { |
| if (!CanReloadPreFinalized(replacement, context)) return; |
| } |
| TIR_Print("Class `%s` can be reloaded (%" Pd " and %" Pd ")\n", ToCString(), |
| id(), replacement.id()); |
| } |
| |
| bool Class::RequiresInstanceMorphing(const Class& replacement) const { |
| // Get the field maps for both classes. These field maps walk the class |
| // hierarchy. |
| const Array& fields = |
| Array::Handle(OffsetToFieldMap(true /* original classes */)); |
| const Array& replacement_fields = |
| Array::Handle(replacement.OffsetToFieldMap()); |
| |
| // Check that the size of the instance is the same. |
| if (fields.Length() != replacement_fields.Length()) return true; |
| |
| // Check that we have the same next field offset. This check is not |
| // redundant with the one above because the instance OffsetToFieldMap |
| // array length is based on the instance size (which may be aligned up). |
| if (host_next_field_offset() != replacement.host_next_field_offset()) { |
| return true; |
| } |
| |
| // Verify that field names / offsets match across the entire hierarchy. |
| Field& field = Field::Handle(); |
| String& field_name = String::Handle(); |
| Field& replacement_field = Field::Handle(); |
| String& replacement_field_name = String::Handle(); |
| |
| for (intptr_t i = 0; i < fields.Length(); i++) { |
| if (fields.At(i) == Field::null()) { |
| ASSERT(replacement_fields.At(i) == Field::null()); |
| continue; |
| } |
| field = Field::RawCast(fields.At(i)); |
| replacement_field = Field::RawCast(replacement_fields.At(i)); |
| field_name = field.name(); |
| replacement_field_name = replacement_field.name(); |
| if (!field_name.Equals(replacement_field_name)) return true; |
| } |
| return false; |
| } |
| |
| bool Class::CanReloadFinalized(const Class& replacement, |
| ProgramReloadContext* context) const { |
| // Make sure the declaration types argument count matches for the two classes. |
| // ex. class A<int,B> {} cannot be replace with class A<B> {}. |
| auto group_context = context->group_reload_context(); |
| auto shared_class_table = |
| group_context->isolate_group()->shared_class_table(); |
| if (NumTypeArguments() != replacement.NumTypeArguments()) { |
| group_context->AddReasonForCancelling( |
| new (context->zone()) |
| TypeParametersChanged(context->zone(), *this, replacement)); |
| return false; |
| } |
| if (RequiresInstanceMorphing(replacement)) { |
| ASSERT(id() == replacement.id()); |
| const classid_t cid = id(); |
| // We unconditionally create an instance morpher. As a side effect of |
| // building the morpher, we will mark all new fields as late. |
| auto instance_morpher = InstanceMorpher::CreateFromClassDescriptors( |
| context->zone(), shared_class_table, *this, replacement); |
| group_context->EnsureHasInstanceMorpherFor(cid, instance_morpher); |
| } |
| return true; |
| } |
| |
| bool Class::CanReloadPreFinalized(const Class& replacement, |
| ProgramReloadContext* context) const { |
| // The replacement class must also prefinalized. |
| if (!replacement.is_prefinalized()) { |
| context->group_reload_context()->AddReasonForCancelling( |
| new (context->zone()) |
| PreFinalizedConflict(context->zone(), *this, replacement)); |
| return false; |
| } |
| // Check the instance sizes are equal. |
| if (host_instance_size() != replacement.host_instance_size()) { |
| context->group_reload_context()->AddReasonForCancelling( |
| new (context->zone()) |
| InstanceSizeConflict(context->zone(), *this, replacement)); |
| return false; |
| } |
| return true; |
| } |
| |
| void Library::CheckReload(const Library& replacement, |
| ProgramReloadContext* context) const { |
| // Carry over the loaded bit of any deferred prefixes. |
| Object& object = Object::Handle(); |
| LibraryPrefix& prefix = LibraryPrefix::Handle(); |
| LibraryPrefix& original_prefix = LibraryPrefix::Handle(); |
| String& name = String::Handle(); |
| String& original_name = String::Handle(); |
| DictionaryIterator it(replacement); |
| while (it.HasNext()) { |
| object = it.GetNext(); |
| if (!object.IsLibraryPrefix()) continue; |
| prefix ^= object.ptr(); |
| if (!prefix.is_deferred_load()) continue; |
| |
| name = prefix.name(); |
| DictionaryIterator original_it(*this); |
| while (original_it.HasNext()) { |
| object = original_it.GetNext(); |
| if (!object.IsLibraryPrefix()) continue; |
| original_prefix ^= object.ptr(); |
| if (!original_prefix.is_deferred_load()) continue; |
| original_name = original_prefix.name(); |
| if (!name.Equals(original_name)) continue; |
| |
| // The replacement of the old prefix with the new prefix |
| // in Isolate::loaded_prefixes_set_ implicitly carried |
| // the loaded state over to the new prefix. |
| context->AddBecomeMapping(original_prefix, prefix); |
| } |
| } |
| } |
| |
| void CallSiteResetter::Reset(const ICData& ic) { |
| ICData::RebindRule rule = ic.rebind_rule(); |
| if (rule == ICData::kInstance) { |
| const intptr_t num_args = ic.NumArgsTested(); |
| const bool tracking_exactness = ic.is_tracking_exactness(); |
| const intptr_t len = ic.Length(); |
| // We need at least one non-sentinel entry to require a check |
| // for the smi fast path case. |
| if (num_args == 2 && len >= 2) { |
| if (ic.IsImmutable()) { |
| return; |
| } |
| name_ = ic.target_name(); |
| const Class& smi_class = Class::Handle(zone_, Smi::Class()); |
| const Function& smi_op_target = Function::Handle( |
| zone_, Resolver::ResolveDynamicAnyArgs(zone_, smi_class, name_)); |
| GrowableArray<intptr_t> class_ids(2); |
| Function& target = Function::Handle(zone_); |
| ic.GetCheckAt(0, &class_ids, &target); |
| if ((target.ptr() == smi_op_target.ptr()) && (class_ids[0] == kSmiCid) && |
| (class_ids[1] == kSmiCid)) { |
| // The smi fast path case, preserve the initial entry but reset the |
| // count. |
| ic.ClearCountAt(0, *this); |
| ic.WriteSentinelAt(1, *this); |
| entries_ = ic.entries(); |
| entries_.Truncate(2 * ic.TestEntryLength()); |
| return; |
| } |
| // Fall back to the normal behavior with cached empty ICData arrays. |
| } |
| entries_ = ICData::CachedEmptyICDataArray(num_args, tracking_exactness); |
| ic.set_entries(entries_); |
| ic.set_is_megamorphic(false); |
| return; |
| } else if (rule == ICData::kNoRebind || rule == ICData::kNSMDispatch) { |
| // TODO(30877) we should account for addition/removal of NSM. |
| // Don't rebind dispatchers. |
| return; |
| } else if (rule == ICData::kStatic || rule == ICData::kSuper) { |
| old_target_ = ic.GetTargetAt(0); |
| if (old_target_.IsNull()) { |
| FATAL("old_target is NULL.\n"); |
| } |
| name_ = old_target_.name(); |
| |
| if (rule == ICData::kStatic) { |
| ASSERT(old_target_.is_static() || |
| old_target_.kind() == UntaggedFunction::kConstructor); |
| // This can be incorrect if the call site was an unqualified invocation. |
| new_cls_ = old_target_.Owner(); |
| new_target_ = Resolver::ResolveFunction(zone_, new_cls_, name_); |
| if (new_target_.kind() != old_target_.kind()) { |
| new_target_ = Function::null(); |
| } |
| } else { |
| // Super call. |
| caller_ = ic.Owner(); |
| ASSERT(!caller_.is_static()); |
| new_cls_ = caller_.Owner(); |
| new_cls_ = new_cls_.SuperClass(); |
| new_target_ = Resolver::ResolveDynamicAnyArgs(zone_, new_cls_, name_, |
| /*allow_add=*/true); |
| } |
| args_desc_array_ = ic.arguments_descriptor(); |
| ArgumentsDescriptor args_desc(args_desc_array_); |
| if (new_target_.IsNull() || |
| !new_target_.AreValidArguments(args_desc, NULL)) { |
| // TODO(rmacnak): Patch to a NSME stub. |
| VTIR_Print("Cannot rebind static call to %s from %s\n", |
| old_target_.ToCString(), |
| Object::Handle(zone_, ic.Owner()).ToCString()); |
| return; |
| } |
| ic.ClearAndSetStaticTarget(new_target_, *this); |
| } else { |
| FATAL("Unexpected rebind rule."); |
| } |
| } |
| |
| #endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME) |
| |
| } // namespace dart |
