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https://github.com/dart-lang/sdk
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![Martin Kustermann](/assets/img/avatar_default.png)
This CL moves heap related information (namely instance sizes and allocation stats) out of the [ClassTable] into a [SharedClassTable]. Both classes are always in sync (i.e. they have the same number of entries). This CL also changes GC related code to start using the size information from the new [SharedClassTable]. In a futher step we will move the heap as well as this shared class table out of the [Isolate] and into [IsolateGroup]. Issue https://github.com/dart-lang/sdk/issues/36097 Change-Id: Id54a89c9251ad3bbc13e60d32dc4f7bcc7f1d805 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/116064 Commit-Queue: Martin Kustermann <kustermann@google.com> Reviewed-by: Ryan Macnak <rmacnak@google.com>
413 lines
12 KiB
C++
413 lines
12 KiB
C++
// Copyright (c) 2016, 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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#ifndef RUNTIME_VM_ISOLATE_RELOAD_H_
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#define RUNTIME_VM_ISOLATE_RELOAD_H_
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#include "include/dart_tools_api.h"
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#include "vm/globals.h"
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#include "vm/growable_array.h"
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#include "vm/hash_map.h"
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#include "vm/log.h"
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#include "vm/object.h"
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DECLARE_FLAG(bool, trace_reload);
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DECLARE_FLAG(bool, trace_reload_verbose);
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// 'Trace Isolate Reload' TIR_Print
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#if defined(_MSC_VER)
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#define TIR_Print(format, ...) \
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if (FLAG_trace_reload) Log::Current()->Print(format, __VA_ARGS__)
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#else
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#define TIR_Print(format, ...) \
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if (FLAG_trace_reload) Log::Current()->Print(format, ##__VA_ARGS__)
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#endif
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// 'Verbose Trace Isolate Reload' VTIR_Print
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#if defined(_MSC_VER)
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#define VTIR_Print(format, ...) \
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if (FLAG_trace_reload_verbose) Log::Current()->Print(format, __VA_ARGS__)
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#else
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#define VTIR_Print(format, ...) \
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if (FLAG_trace_reload_verbose) Log::Current()->Print(format, ##__VA_ARGS__)
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#endif
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#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
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namespace dart {
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class BitVector;
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class GrowableObjectArray;
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class Isolate;
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class Library;
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class ObjectPointerVisitor;
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class ObjectStore;
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class RawError;
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class RawGrowableObjectArray;
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class RawLibrary;
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class RawObject;
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class RawString;
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class Script;
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class UpdateClassesVisitor;
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class InstanceMorpher : public ZoneAllocated {
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public:
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InstanceMorpher(Zone* zone, const Class& from, const Class& to);
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virtual ~InstanceMorpher() {}
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// Called on each instance that needs to be morphed.
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RawInstance* Morph(const Instance& instance) const;
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void RunNewFieldInitializers() const;
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// Adds an object to be morphed.
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void AddObject(RawObject* object) const;
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// Create the morphed objects based on the before() list.
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void CreateMorphedCopies() const;
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// Dump the state of the morpher.
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void Dump() const;
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// Append the morper info to JSON array.
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void AppendTo(JSONArray* array);
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// Returns the list of objects that need to be morphed.
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ZoneGrowableArray<const Instance*>* before() const { return before_; }
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// Returns the list of morphed objects (matches order in before()).
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ZoneGrowableArray<const Instance*>* after() const { return after_; }
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// Returns the list of new fields.
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ZoneGrowableArray<const Field*>* new_fields() const { return new_fields_; }
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// Returns the cid associated with the from_ and to_ class.
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intptr_t cid() const { return cid_; }
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private:
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const Class& from_;
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const Class& to_;
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ZoneGrowableArray<intptr_t> mapping_;
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ZoneGrowableArray<const Instance*>* before_;
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ZoneGrowableArray<const Instance*>* after_;
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ZoneGrowableArray<const Field*>* new_fields_;
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intptr_t cid_;
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void ComputeMapping();
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void DumpFormatFor(const Class& cls) const;
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};
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class ReasonForCancelling : public ZoneAllocated {
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public:
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explicit ReasonForCancelling(Zone* zone) {}
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virtual ~ReasonForCancelling() {}
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// Reports a reason for cancelling reload.
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void Report(IsolateReloadContext* context);
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// Conversion to a VM error object.
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// Default implementation calls ToString.
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virtual RawError* ToError();
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// Conversion to a string object.
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// Default implementation calls ToError.
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virtual RawString* ToString();
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// Append the reason to JSON array.
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virtual void AppendTo(JSONArray* array);
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// Concrete subclasses must override either ToError or ToString.
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};
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// Abstract class for also capturing the from_ and to_ class.
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class ClassReasonForCancelling : public ReasonForCancelling {
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public:
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ClassReasonForCancelling(Zone* zone, const Class& from, const Class& to);
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void AppendTo(JSONArray* array);
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protected:
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const Class& from_;
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const Class& to_;
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};
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class IsolateReloadContext {
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public:
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explicit IsolateReloadContext(Isolate* isolate, JSONStream* js);
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~IsolateReloadContext();
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// If kernel_buffer is provided, the VM takes ownership when Reload is called.
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void Reload(bool force_reload,
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const char* root_script_url = NULL,
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const char* packages_url = NULL,
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const uint8_t* kernel_buffer = NULL,
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intptr_t kernel_buffer_size = 0);
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// All zone allocated objects must be allocated from this zone.
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Zone* zone() const { return zone_; }
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bool UseSavedClassTableForGC() const { return saved_class_table_ != nullptr; }
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bool reload_skipped() const { return reload_skipped_; }
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bool reload_aborted() const { return reload_aborted_; }
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RawError* error() const;
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int64_t reload_timestamp() const { return reload_timestamp_; }
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static Dart_FileModifiedCallback file_modified_callback() {
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return file_modified_callback_;
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}
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static void SetFileModifiedCallback(Dart_FileModifiedCallback callback) {
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file_modified_callback_ = callback;
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}
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static bool IsSameField(const Field& a, const Field& b);
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static bool IsSameLibrary(const Library& a_lib, const Library& b_lib);
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static bool IsSameClass(const Class& a, const Class& b);
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private:
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RawLibrary* saved_root_library() const;
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RawGrowableObjectArray* saved_libraries() const;
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RawClass* FindOriginalClass(const Class& cls);
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bool IsDirty(const Library& lib);
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// Prefers old classes when we are in the middle of a reload.
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RawClass* GetClassForHeapWalkAt(intptr_t cid);
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intptr_t GetClassSizeForHeapWalkAt(intptr_t cid);
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void DiscardSavedClassTable(bool is_rollback);
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void RegisterClass(const Class& new_cls);
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// Finds the library private key for |replacement_or_new| or return null
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// if |replacement_or_new| is new.
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RawString* FindLibraryPrivateKey(const Library& replacement_or_new);
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int64_t start_time_micros() const { return start_time_micros_; }
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// Tells whether there are reasons for cancelling the reload.
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bool HasReasonsForCancelling() const {
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return !reasons_to_cancel_reload_.is_empty();
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}
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// Record problem for this reload.
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void AddReasonForCancelling(ReasonForCancelling* reason);
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// Reports all reasons for cancelling reload.
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void ReportReasonsForCancelling();
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// Reports the details of a reload operation.
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void ReportOnJSON(JSONStream* stream);
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// Store morphing operation.
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void AddInstanceMorpher(InstanceMorpher* morpher);
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// Tells whether instance in the heap must be morphed.
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bool HasInstanceMorphers() const { return !instance_morphers_.is_empty(); }
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// NOTE: FinalizeLoading will be called *before* Reload() returns. This
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// function will not be called if the embedder does not call
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// Dart_FinalizeLoading.
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void FinalizeLoading();
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// NOTE: FinalizeFailedLoad will be called *before* Reload returns. This
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// function will not be called if the embedder calls Dart_FinalizeLoading.
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void FinalizeFailedLoad(const Error& error);
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// Called by both FinalizeLoading and FinalizeFailedLoad.
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void CommonFinalizeTail();
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// Report back through the observatory channels.
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void ReportError(const Error& error);
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void ReportSuccess();
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void set_saved_root_library(const Library& value);
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void set_saved_libraries(const GrowableObjectArray& value);
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void VisitObjectPointers(ObjectPointerVisitor* visitor);
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Isolate* isolate() { return isolate_; }
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ObjectStore* object_store();
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void EnsuredUnoptimizedCodeForStack();
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void DeoptimizeDependentCode();
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void Checkpoint();
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void CheckpointClasses();
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bool ScriptModifiedSince(const Script& script, int64_t since);
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void FindModifiedSources(Thread* thread,
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bool force_reload,
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Dart_SourceFile** modified_sources,
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intptr_t* count,
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const char* packages_url);
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void CheckpointLibraries();
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void MorphInstancesAndApplyNewClassTable();
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void RunNewFieldInitializers();
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bool ValidateReload();
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void Rollback();
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void RollbackClasses();
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void RollbackLibraries();
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#ifdef DEBUG
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void VerifyMaps();
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#endif
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void Commit();
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void PostCommit();
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void ClearReplacedObjectBits();
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// atomic_install:
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void RunInvalidationVisitors();
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void ResetUnoptimizedICsOnStack();
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void ResetMegamorphicCaches();
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void InvalidateWorld();
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// The zone used for all reload related allocations.
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Zone* zone_;
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int64_t start_time_micros_;
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int64_t reload_timestamp_;
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Isolate* isolate_;
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bool reload_skipped_;
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bool reload_aborted_;
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bool reload_finalized_;
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JSONStream* js_;
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intptr_t saved_num_cids_;
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ClassAndSize* saved_class_table_;
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intptr_t num_saved_libs_;
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intptr_t num_received_libs_;
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intptr_t bytes_received_libs_;
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intptr_t num_received_classes_;
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intptr_t num_received_procedures_;
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// Collect the necessary instance transformation for schema changes.
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ZoneGrowableArray<InstanceMorpher*> instance_morphers_;
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// Collects the reasons for cancelling the reload.
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ZoneGrowableArray<ReasonForCancelling*> reasons_to_cancel_reload_;
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// Required trait for the cid_mapper_;
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struct MorpherTrait {
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typedef InstanceMorpher* Value;
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typedef intptr_t Key;
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typedef InstanceMorpher* Pair;
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static Key KeyOf(Pair kv) { return kv->cid(); }
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static Value ValueOf(Pair kv) { return kv; }
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static intptr_t Hashcode(Key key) { return key; }
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static bool IsKeyEqual(Pair kv, Key key) { return kv->cid() == key; }
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};
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// Hash map from cid to InstanceMorpher.
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DirectChainedHashMap<MorpherTrait> cid_mapper_;
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struct LibraryInfo {
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bool dirty;
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};
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MallocGrowableArray<LibraryInfo> library_infos_;
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// A bit vector indicating which of the original libraries were modified.
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BitVector* modified_libs_;
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RawClass* OldClassOrNull(const Class& replacement_or_new);
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RawLibrary* OldLibraryOrNull(const Library& replacement_or_new);
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RawLibrary* OldLibraryOrNullBaseMoved(const Library& replacement_or_new);
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void BuildLibraryMapping();
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void BuildRemovedClassesSet();
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void AddClassMapping(const Class& replacement_or_new, const Class& original);
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void AddLibraryMapping(const Library& replacement_or_new,
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const Library& original);
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void AddStaticFieldMapping(const Field& old_field, const Field& new_field);
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void AddBecomeMapping(const Object& old, const Object& neu);
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void AddEnumBecomeMapping(const Object& old, const Object& neu);
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void RebuildDirectSubclasses();
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RawClass* MappedClass(const Class& replacement_or_new);
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RawLibrary* MappedLibrary(const Library& replacement_or_new);
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RawObject** from() { return reinterpret_cast<RawObject**>(&script_url_); }
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RawString* script_url_;
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RawError* error_;
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RawArray* old_classes_set_storage_;
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RawArray* class_map_storage_;
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RawArray* removed_class_set_storage_;
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RawArray* old_libraries_set_storage_;
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RawArray* library_map_storage_;
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RawArray* become_map_storage_;
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RawGrowableObjectArray* become_enum_mappings_;
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RawLibrary* saved_root_library_;
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RawGrowableObjectArray* saved_libraries_;
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RawString* root_url_prefix_;
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RawString* old_root_url_prefix_;
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RawObject** to() {
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return reinterpret_cast<RawObject**>(&old_root_url_prefix_);
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}
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friend class Isolate;
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friend class Class; // AddStaticFieldMapping, AddEnumBecomeMapping.
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friend class Library;
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friend class ObjectLocator;
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friend class MarkFunctionsForRecompilation; // IsDirty.
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friend class ReasonForCancelling;
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static Dart_FileModifiedCallback file_modified_callback_;
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};
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class CallSiteResetter : public ValueObject {
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public:
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explicit CallSiteResetter(Zone* zone);
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void ZeroEdgeCounters(const Function& function);
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void ResetCaches(const Code& code);
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void ResetCaches(const ObjectPool& pool);
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void RebindStaticTargets(const Bytecode& code);
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void Reset(const ICData& ic);
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void ResetSwitchableCalls(const Code& code);
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private:
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Zone* zone_;
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Instructions& instrs_;
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ObjectPool& pool_;
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Object& object_;
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String& name_;
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Class& new_cls_;
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Library& new_lib_;
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Function& new_function_;
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Field& new_field_;
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Array& entries_;
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Function& old_target_;
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Function& new_target_;
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Function& caller_;
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Array& args_desc_array_;
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Array& ic_data_array_;
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Array& edge_counters_;
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PcDescriptors& descriptors_;
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ICData& ic_data_;
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};
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} // namespace dart
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#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
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#endif // RUNTIME_VM_ISOLATE_RELOAD_H_
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