| // Copyright (c) 2012, 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_HANDLES_IMPL_H_ |
| #define RUNTIME_VM_HANDLES_IMPL_H_ |
| |
| #include "vm/handle_visitor.h" |
| #include "vm/thread.h" |
| #include "vm/visitor.h" |
| |
| namespace dart { |
| |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| void Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| VisitObjectPointers(ObjectPointerVisitor* visitor) { |
| // Visit all zone handles. |
| HandlesBlock* block = zone_blocks_; |
| while (block != nullptr) { |
| block->VisitObjectPointers(visitor); |
| block = block->next_block(); |
| } |
| |
| // Visit all scoped handles. |
| VisitScopedHandles(visitor); |
| } |
| |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| void Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| VisitScopedHandles(ObjectPointerVisitor* visitor) { |
| HandlesBlock* block = &first_scoped_block_; |
| do { |
| block->VisitObjectPointers(visitor); |
| if (block == scoped_blocks_) { |
| return; |
| } |
| block = block->next_block(); |
| } while (block != nullptr); |
| UNREACHABLE(); |
| } |
| |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| void Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>::Visit( |
| HandleVisitor* visitor) { |
| // Visit all zone handles. |
| HandlesBlock* block = zone_blocks_; |
| while (block != nullptr) { |
| block->Visit(visitor); |
| block = block->next_block(); |
| } |
| |
| // Visit all scoped handles. |
| block = &first_scoped_block_; |
| do { |
| block->Visit(visitor); |
| block = block->next_block(); |
| } while (block != nullptr); |
| } |
| |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| void Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>::Reset() { |
| // Delete all the extra zone handle blocks allocated and reinit the first |
| // zone block. |
| if (zone_blocks_ != nullptr) { |
| DeleteHandleBlocks(zone_blocks_->next_block()); |
| zone_blocks_->ReInit(); |
| } |
| |
| // Delete all the extra scoped handle blocks allocated and reinit the first |
| // scoped block. |
| DeleteHandleBlocks(first_scoped_block_.next_block()); |
| first_scoped_block_.ReInit(); |
| scoped_blocks_ = &first_scoped_block_; |
| } |
| |
| // Figure out the current handle scope using the current Zone and |
| // allocate a handle in that scope. The function assumes that a |
| // current handle scope exists. It asserts for this appropriately. |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| uword Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| AllocateHandle(Zone* zone) { |
| #if defined(DEBUG) |
| Thread* thread = Thread::Current(); |
| ASSERT(thread->MayAllocateHandles()); |
| #endif // DEBUG |
| Handles* handles = zone->handles(); |
| ASSERT(handles != nullptr); |
| return handles->AllocateScopedHandle(); |
| } |
| |
| // The function assumes that 'zone' is the current zone and asserts for |
| // this appropriately. |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| uword Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| AllocateZoneHandle(Zone* zone) { |
| #if defined(DEBUG) |
| Thread* thread = Thread::Current(); |
| ASSERT(zone->ContainsNestedZone(thread->zone())); |
| ASSERT(thread->MayAllocateHandles()); |
| #endif // DEBUG |
| Handles* handles = zone->handles(); |
| ASSERT(handles != nullptr); |
| uword address = handles->AllocateHandleInZone(); |
| return address; |
| } |
| |
| #if defined(DEBUG) |
| // Figure out the current zone using the current Thread and |
| // check if the specified handle has been allocated in this zone. |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| bool Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| IsZoneHandle(uword handle) { |
| // TODO(5411412): Accessing the current thread is a performance problem, |
| // consider passing it down as a parameter. |
| Thread* thread = Thread::Current(); |
| ASSERT(thread != nullptr); |
| ASSERT(thread->zone() != nullptr); |
| Handles* handles = thread->zone()->handles(); |
| ASSERT(handles != nullptr); |
| return handles->IsValidZoneHandle(handle); |
| } |
| #endif |
| |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| void Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| DeleteAll() { |
| // Delete all the zone allocated handle blocks. |
| // GCTrace does not need to trace this call to DeleteHandleBlocks, |
| // since the individual zone deletions will be caught |
| // by instrumentation in the BaseZone destructor. |
| DeleteHandleBlocks(zone_blocks_); |
| zone_blocks_ = nullptr; |
| |
| // Delete all the scoped handle blocks. |
| scoped_blocks_ = first_scoped_block_.next_block(); |
| DeleteHandleBlocks(scoped_blocks_); |
| first_scoped_block_.ReInit(); |
| scoped_blocks_ = &first_scoped_block_; |
| } |
| |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| void Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| DeleteHandleBlocks(HandlesBlock* blocks) { |
| while (blocks != nullptr) { |
| HandlesBlock* block = blocks; |
| blocks = blocks->next_block(); |
| delete block; |
| } |
| } |
| |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| void Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| SetupNextScopeBlock() { |
| if (FLAG_trace_handles) { |
| OS::PrintErr("*** Handle Counts for (0x%" Px "):Zone = %d,Scoped = %d\n", |
| reinterpret_cast<intptr_t>(this), CountZoneHandles(), |
| CountScopedHandles()); |
| } |
| if (scoped_blocks_->next_block() == nullptr) { |
| HandlesBlock* block = new HandlesBlock(nullptr); |
| scoped_blocks_->set_next_block(block); |
| } |
| scoped_blocks_ = scoped_blocks_->next_block(); |
| scoped_blocks_->set_next_handle_slot(0); |
| #if defined(DEBUG) |
| scoped_blocks_->ZapFreeHandles(); |
| #endif |
| } |
| |
| // Validation of the handle involves iterating through all the |
| // handle blocks to check if the handle is valid, please |
| // use this only in ASSERT code for verification purposes. |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| bool Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| IsValidScopedHandle(uword handle) const { |
| const HandlesBlock* iterator = &first_scoped_block_; |
| while (iterator != nullptr) { |
| if (iterator->IsValidHandle(handle)) { |
| return true; |
| } |
| iterator = iterator->next_block(); |
| } |
| return false; |
| } |
| |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| bool Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| IsValidZoneHandle(uword handle) const { |
| const HandlesBlock* iterator = zone_blocks_; |
| while (iterator != nullptr) { |
| if (iterator->IsValidHandle(handle)) { |
| return true; |
| } |
| iterator = iterator->next_block(); |
| } |
| return false; |
| } |
| |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| void Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| SetupNextZoneBlock() { |
| if (FLAG_trace_handles) { |
| OS::PrintErr("*** Handle Counts for (0x%" Px "):Zone = %d,Scoped = %d\n", |
| reinterpret_cast<intptr_t>(this), CountZoneHandles(), |
| CountScopedHandles()); |
| } |
| zone_blocks_ = new HandlesBlock(zone_blocks_); |
| } |
| |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| int Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| CountScopedHandles() const { |
| int count = 0; |
| const HandlesBlock* block = &first_scoped_block_; |
| do { |
| count += block->HandleCount(); |
| if (block == scoped_blocks_) { |
| return count; |
| } |
| block = block->next_block(); |
| } while (block != nullptr); |
| UNREACHABLE(); |
| return 0; |
| } |
| |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| int Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| CountZoneHandles() const { |
| int count = 0; |
| const HandlesBlock* block = zone_blocks_; |
| while (block != nullptr) { |
| count += block->HandleCount(); |
| block = block->next_block(); |
| } |
| return count; |
| } |
| |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>::HandlesBlock:: |
| ~HandlesBlock() { |
| #if defined(DEBUG) |
| ReInit(); |
| #endif |
| } |
| |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| void Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| HandlesBlock::ReInit() { |
| next_handle_slot_ = 0; |
| next_block_ = nullptr; |
| #if defined(DEBUG) |
| ZapFreeHandles(); |
| #endif |
| } |
| |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| void Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| HandlesBlock::VisitObjectPointers(ObjectPointerVisitor* visitor) { |
| ASSERT(visitor != nullptr); |
| for (intptr_t i = 0; i < next_handle_slot_; i += kHandleSizeInWords) { |
| visitor->VisitPointer( |
| reinterpret_cast<ObjectPtr*>(&data_[i + kOffsetOfRawPtr / kWordSize])); |
| } |
| } |
| |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| void Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| HandlesBlock::Visit(HandleVisitor* visitor) { |
| ASSERT(visitor != nullptr); |
| for (intptr_t i = 0; i < next_handle_slot_; i += kHandleSizeInWords) { |
| visitor->VisitHandle(reinterpret_cast<uword>(&data_[i])); |
| } |
| } |
| |
| #if defined(DEBUG) |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| void Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| HandlesBlock::ZapFreeHandles() { |
| // Reinitialize the handle area to some uninitialized value. |
| for (intptr_t i = next_handle_slot_; |
| i < (kHandleSizeInWords * kHandlesPerChunk); i++) { |
| data_[i] = kZapUninitializedWord; |
| } |
| } |
| #endif |
| |
| template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr> |
| int Handles<kHandleSizeInWords, kHandlesPerChunk, kOffsetOfRawPtr>:: |
| HandlesBlock::HandleCount() const { |
| return (next_handle_slot_ / kHandleSizeInWords); |
| } |
| |
| } // namespace dart |
| |
| #endif // RUNTIME_VM_HANDLES_IMPL_H_ |