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https://github.com/dart-lang/sdk
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f496e538f4
This is the next step towards preventing compiler from directly peeking into runtime and instead interact with runtime through a well defined surface. The goal of the refactoring to locate all places where compiler accesses some runtime information and partion those accesses into two categories: - creating objects in the host runtime (e.g. allocating strings, numbers, etc) during compilation; - accessing properties of the target runtime (e.g. offsets of fields) to embed those into the generated code; This change introduces dart::compiler and dart::compiler::target namespaces. All code in the compiler will gradually be moved into dart::compiler namespace. One of the motivations for this change is to be able to prevent access to globally defined host constants like kWordSize by shadowing them in the dart::compiler namespace. The nested namespace dart::compiler::target hosts all information about target runtime that compiler could access, e.g. compiler::target::kWordSize defines word size of the target which will eventually be made different from the host kWordSize (defined by dart::kWordSize). The API for compiler to runtime interaction is placed into compiler_api.h. Note that we still permit runtime to access compiler internals directly - this is not going to be decoupled as part of this work. Issue https://github.com/dart-lang/sdk/issues/31709 Change-Id: If4396d295879391becfa6c38d4802bbff81f5b20 Reviewed-on: https://dart-review.googlesource.com/c/90242 Commit-Queue: Vyacheslav Egorov <vegorov@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>
106 lines
3.2 KiB
C++
106 lines
3.2 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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#include "vm/handles.h"
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#include "platform/assert.h"
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#include "platform/utils.h"
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#include "vm/dart_api_state.h"
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#include "vm/flags.h"
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#include "vm/os.h"
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#include "vm/raw_object.h"
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#include "vm/visitor.h"
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#include "vm/zone.h"
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#include "vm/handles_impl.h"
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namespace dart {
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DEFINE_FLAG(bool, verify_handles, false, "Verify handles.");
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VMHandles::~VMHandles() {
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if (FLAG_trace_handles) {
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OS::PrintErr("*** Handle Counts for 0x(%" Px "):Zone = %d,Scoped = %d\n",
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reinterpret_cast<intptr_t>(this), CountZoneHandles(),
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CountScopedHandles());
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OS::PrintErr("*** Deleting VM handle block 0x%" Px "\n",
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reinterpret_cast<intptr_t>(this));
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}
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}
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void VMHandles::VisitObjectPointers(ObjectPointerVisitor* visitor) {
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return Handles<kVMHandleSizeInWords, kVMHandlesPerChunk,
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kOffsetOfRawPtr>::VisitObjectPointers(visitor);
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}
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#if defined(DEBUG)
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static bool IsCurrentApiNativeScope(Zone* zone) {
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ApiNativeScope* scope = ApiNativeScope::Current();
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return (scope != NULL) && (scope->zone() == zone);
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}
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#endif // DEBUG
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uword VMHandles::AllocateHandle(Zone* zone) {
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DEBUG_ASSERT(!IsCurrentApiNativeScope(zone));
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return Handles<kVMHandleSizeInWords, kVMHandlesPerChunk,
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kOffsetOfRawPtr>::AllocateHandle(zone);
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}
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uword VMHandles::AllocateZoneHandle(Zone* zone) {
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DEBUG_ASSERT(!IsCurrentApiNativeScope(zone));
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return Handles<kVMHandleSizeInWords, kVMHandlesPerChunk,
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kOffsetOfRawPtr>::AllocateZoneHandle(zone);
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}
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bool VMHandles::IsZoneHandle(uword handle) {
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return Handles<kVMHandleSizeInWords, kVMHandlesPerChunk,
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kOffsetOfRawPtr>::IsZoneHandle(handle);
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}
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int VMHandles::ScopedHandleCount() {
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Thread* thread = Thread::Current();
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ASSERT(thread->zone() != NULL);
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VMHandles* handles = thread->zone()->handles();
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return handles->CountScopedHandles();
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}
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int VMHandles::ZoneHandleCount() {
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Thread* thread = Thread::Current();
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ASSERT(thread->zone() != NULL);
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VMHandles* handles = thread->zone()->handles();
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return handles->CountZoneHandles();
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}
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void HandleScope::Initialize() {
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ASSERT(thread()->MayAllocateHandles());
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VMHandles* handles = thread()->zone()->handles();
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ASSERT(handles != NULL);
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saved_handle_block_ = handles->scoped_blocks_;
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saved_handle_slot_ = handles->scoped_blocks_->next_handle_slot();
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#if defined(DEBUG)
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link_ = thread()->top_handle_scope();
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thread()->set_top_handle_scope(this);
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#endif
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}
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HandleScope::HandleScope(ThreadState* thread) : StackResource(thread) {
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Initialize();
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}
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HandleScope::~HandleScope() {
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ASSERT(thread()->zone() != NULL);
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VMHandles* handles = thread()->zone()->handles();
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ASSERT(handles != NULL);
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handles->scoped_blocks_ = saved_handle_block_;
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handles->scoped_blocks_->set_next_handle_slot(saved_handle_slot_);
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#if defined(DEBUG)
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handles->VerifyScopedHandleState();
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handles->ZapFreeScopedHandles();
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ASSERT(thread()->top_handle_scope() == this);
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thread()->set_top_handle_scope(link_);
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#endif
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}
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} // namespace dart
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