mirror of
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c6a199e40b
R=fschneider@google.com, rmacnak@google.com BUG= Review-Url: https://codereview.chromium.org/2699853002 .
274 lines
7.2 KiB
C++
274 lines
7.2 KiB
C++
// Copyright (c) 2012, 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_CLASS_TABLE_H_
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#define RUNTIME_VM_CLASS_TABLE_H_
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#include "platform/assert.h"
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#include "vm/atomic.h"
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#include "vm/bitfield.h"
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#include "vm/globals.h"
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namespace dart {
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class Class;
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class ClassStats;
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class JSONArray;
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class JSONObject;
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class JSONStream;
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template <typename T>
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class MallocGrowableArray;
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class ObjectPointerVisitor;
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class RawClass;
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#ifndef PRODUCT
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template <typename T>
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class AllocStats {
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public:
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T new_count;
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T new_size;
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T old_count;
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T old_size;
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void ResetNew() {
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new_count = 0;
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new_size = 0;
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}
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void AddNew(T size) {
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AtomicOperations::IncrementBy(&new_count, 1);
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AtomicOperations::IncrementBy(&new_size, size);
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}
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void ResetOld() {
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old_count = 0;
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old_size = 0;
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}
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void AddOld(T size, T count = 1) {
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AtomicOperations::IncrementBy(&old_count, count);
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AtomicOperations::IncrementBy(&old_size, size);
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}
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void Reset() {
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new_count = 0;
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new_size = 0;
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old_count = 0;
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old_size = 0;
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}
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// For classes with fixed instance size we do not emit code to update
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// the size statistics. Update them by calling this method.
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void UpdateSize(intptr_t instance_size) {
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ASSERT(instance_size > 0);
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old_size = old_count * instance_size;
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new_size = new_count * instance_size;
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}
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void Verify() {
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ASSERT(new_count >= 0);
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ASSERT(new_size >= 0);
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ASSERT(old_count >= 0);
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ASSERT(old_size >= 0);
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}
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};
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class ClassHeapStats {
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public:
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// Snapshot before GC.
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AllocStats<intptr_t> pre_gc;
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// Live after GC.
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AllocStats<intptr_t> post_gc;
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// Allocations since the last GC.
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AllocStats<intptr_t> recent;
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// Accumulated (across GC) allocations .
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AllocStats<int64_t> accumulated;
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// Snapshot of recent at the time of the last reset.
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AllocStats<intptr_t> last_reset;
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// Promoted from new to old by last new GC.
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intptr_t promoted_count;
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intptr_t promoted_size;
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static intptr_t allocated_since_gc_new_space_offset() {
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return OFFSET_OF(ClassHeapStats, recent) +
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OFFSET_OF(AllocStats<intptr_t>, new_count);
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}
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static intptr_t allocated_since_gc_old_space_offset() {
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return OFFSET_OF(ClassHeapStats, recent) +
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OFFSET_OF(AllocStats<intptr_t>, old_count);
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}
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static intptr_t allocated_size_since_gc_new_space_offset() {
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return OFFSET_OF(ClassHeapStats, recent) +
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OFFSET_OF(AllocStats<intptr_t>, new_size);
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}
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static intptr_t allocated_size_since_gc_old_space_offset() {
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return OFFSET_OF(ClassHeapStats, recent) +
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OFFSET_OF(AllocStats<intptr_t>, old_size);
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}
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static intptr_t state_offset() { return OFFSET_OF(ClassHeapStats, state_); }
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static intptr_t TraceAllocationMask() { return (1 << kTraceAllocationBit); }
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void Initialize();
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void ResetAtNewGC();
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void ResetAtOldGC();
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void ResetAccumulator();
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void UpdatePromotedAfterNewGC();
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void UpdateSize(intptr_t instance_size);
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#ifndef PRODUCT
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void PrintToJSONObject(const Class& cls, JSONObject* obj) const;
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#endif
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void Verify();
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bool trace_allocation() const { return TraceAllocationBit::decode(state_); }
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void set_trace_allocation(bool trace_allocation) {
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state_ = TraceAllocationBit::update(trace_allocation, state_);
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}
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private:
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enum StateBits {
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kTraceAllocationBit = 0,
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};
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class TraceAllocationBit
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: public BitField<intptr_t, bool, kTraceAllocationBit, 1> {};
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// Recent old at start of last new GC (used to compute promoted_*).
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intptr_t old_pre_new_gc_count_;
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intptr_t old_pre_new_gc_size_;
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intptr_t state_;
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intptr_t align_; // Make SIMARM and ARM agree on the size of ClassHeapStats.
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};
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#endif // !PRODUCT
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class ClassTable {
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public:
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ClassTable();
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// Creates a shallow copy of the original class table for some read-only
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// access, without support for stats data.
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explicit ClassTable(ClassTable* original);
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~ClassTable();
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// Thread-safe.
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RawClass* At(intptr_t index) const {
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ASSERT(IsValidIndex(index));
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return table_[index];
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}
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void SetAt(intptr_t index, RawClass* raw_cls) { table_[index] = raw_cls; }
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bool IsValidIndex(intptr_t index) const {
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return (index > 0) && (index < top_);
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}
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bool HasValidClassAt(intptr_t index) const {
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ASSERT(IsValidIndex(index));
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return table_[index] != NULL;
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}
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intptr_t NumCids() const { return top_; }
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// Used to drop recently added classes.
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void SetNumCids(intptr_t num_cids) {
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ASSERT(num_cids <= top_);
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top_ = num_cids;
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}
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void Register(const Class& cls);
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void AllocateIndex(intptr_t index);
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void RegisterAt(intptr_t index, const Class& cls);
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#if defined(DEBUG)
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void Unregister(intptr_t index);
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#endif
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void Remap(intptr_t* old_to_new_cids);
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void VisitObjectPointers(ObjectPointerVisitor* visitor);
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void Validate();
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void Print();
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// Used by the generated code.
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static intptr_t table_offset() { return OFFSET_OF(ClassTable, table_); }
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// Used by the generated code.
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static intptr_t ClassOffsetFor(intptr_t cid);
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#ifndef PRODUCT
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// Called whenever a class is allocated in the runtime.
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void UpdateAllocatedNew(intptr_t cid, intptr_t size);
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void UpdateAllocatedOld(intptr_t cid, intptr_t size);
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// Called whenever a old GC occurs.
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void ResetCountersOld();
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// Called whenever a new GC occurs.
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void ResetCountersNew();
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// Called immediately after a new GC.
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void UpdatePromoted();
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// Used by the generated code.
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ClassHeapStats** TableAddressFor(intptr_t cid);
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static intptr_t TableOffsetFor(intptr_t cid);
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// Used by the generated code.
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static intptr_t CounterOffsetFor(intptr_t cid, bool is_new_space);
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// Used by the generated code.
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static intptr_t StateOffsetFor(intptr_t cid);
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// Used by the generated code.
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static intptr_t SizeOffsetFor(intptr_t cid, bool is_new_space);
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ClassHeapStats* StatsWithUpdatedSize(intptr_t cid);
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void AllocationProfilePrintJSON(JSONStream* stream);
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void ResetAllocationAccumulators();
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void PrintToJSONObject(JSONObject* object);
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#endif // !PRODUCT
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void AddOldTable(RawClass** old_table);
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// Deallocates table copies. Do not call during concurrent access to table.
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void FreeOldTables();
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void SetTraceAllocationFor(intptr_t cid, bool trace);
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bool TraceAllocationFor(intptr_t cid);
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private:
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friend class GCMarker;
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friend class ScavengerVisitor;
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friend class ClassHeapStatsTestHelper;
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static const int initial_capacity_ = 512;
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static const int capacity_increment_ = 256;
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static bool ShouldUpdateSizeForClassId(intptr_t cid);
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intptr_t top_;
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intptr_t capacity_;
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// Copy-on-write is used for table_, with old copies stored in old_tables_.
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RawClass** table_;
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MallocGrowableArray<RawClass**>* old_tables_;
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#ifndef PRODUCT
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ClassHeapStats* class_heap_stats_table_;
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ClassHeapStats* predefined_class_heap_stats_table_;
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// May not have updated size for variable size classes.
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ClassHeapStats* PreliminaryStatsAt(intptr_t cid);
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void UpdateLiveOld(intptr_t cid, intptr_t size, intptr_t count = 1);
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void UpdateLiveNew(intptr_t cid, intptr_t size);
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#endif // !PRODUCT
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DISALLOW_COPY_AND_ASSIGN(ClassTable);
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};
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} // namespace dart
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#endif // RUNTIME_VM_CLASS_TABLE_H_
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