koda@google.com
89daba5454
The life cycle of Thread is still coupled with the life cycle of Isolate, but the added indirection allows the migration work to proceed, at negligible performance impact. This is a small step towards making Thread different from Isolate and allow a many-to-one relationship. In particular, in prepares for being able to have the sweeper have some minimal separate state from the main thread (eliminating the current fake-isolate hack). Concretely, it moves the thread-local storage key into the Thread class, but for now, keeps a "main_thread" in Isolate for quick access in native/runtime_entry. Also moves cha_ field to Thread (the first of many fields that will move). To summarize, this CL enables the next steps: - moving other fields from Isolate to Thread without circular include-dependencies - replacing sweeper's fake Isolate with a helper Thread (referencing the original Isolate) Also add 'volatile' to local variables that clang thinks could be clobbered. R=asiva@google.com Review URL: https://codereview.chromium.org//1037453002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44703 260f80e4-7a28-3924-810f-c04153c831b5
140 lines
3.1 KiB
C++
140 lines
3.1 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 VM_BASE_ISOLATE_H_
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#define VM_BASE_ISOLATE_H_
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#include "platform/assert.h"
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#include "vm/globals.h"
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namespace dart {
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class HandleScope;
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class StackResource;
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class Zone;
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// A BaseIsolate contains just enough functionality to allocate
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// StackResources. This allows us to inline the StackResource
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// constructor/destructor for performance.
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class BaseIsolate {
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public:
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StackResource* top_resource() const { return top_resource_; }
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void set_top_resource(StackResource* value) { top_resource_ = value; }
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static intptr_t top_resource_offset() {
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return OFFSET_OF(BaseIsolate, top_resource_);
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}
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// DEPRECATED: Use Thread::current_zone.
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Zone* current_zone() const { return current_zone_; }
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void set_current_zone(Zone* zone) { current_zone_ = zone; }
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HandleScope* top_handle_scope() const {
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#if defined(DEBUG)
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return top_handle_scope_;
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#else
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return 0;
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#endif
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}
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void set_top_handle_scope(HandleScope* handle_scope) {
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#if defined(DEBUG)
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top_handle_scope_ = handle_scope;
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#endif
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}
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int32_t no_handle_scope_depth() const {
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#if defined(DEBUG)
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return no_handle_scope_depth_;
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#else
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return 0;
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#endif
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}
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void IncrementNoHandleScopeDepth() {
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#if defined(DEBUG)
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ASSERT(no_handle_scope_depth_ < INT_MAX);
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no_handle_scope_depth_ += 1;
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#endif
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}
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void DecrementNoHandleScopeDepth() {
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#if defined(DEBUG)
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ASSERT(no_handle_scope_depth_ > 0);
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no_handle_scope_depth_ -= 1;
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#endif
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}
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int32_t no_safepoint_scope_depth() const {
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#if defined(DEBUG)
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return no_safepoint_scope_depth_;
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#else
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return 0;
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#endif
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}
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void IncrementNoSafepointScopeDepth() {
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#if defined(DEBUG)
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ASSERT(no_safepoint_scope_depth_ < INT_MAX);
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no_safepoint_scope_depth_ += 1;
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#endif
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}
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void DecrementNoSafepointScopeDepth() {
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#if defined(DEBUG)
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ASSERT(no_safepoint_scope_depth_ > 0);
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no_safepoint_scope_depth_ -= 1;
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#endif
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}
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int32_t no_callback_scope_depth() const {
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return no_callback_scope_depth_;
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}
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void IncrementNoCallbackScopeDepth() {
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ASSERT(no_callback_scope_depth_ < INT_MAX);
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no_callback_scope_depth_ += 1;
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}
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void DecrementNoCallbackScopeDepth() {
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ASSERT(no_callback_scope_depth_ > 0);
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no_callback_scope_depth_ -= 1;
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}
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#if defined(DEBUG)
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static void AssertCurrent(BaseIsolate* isolate);
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#endif
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protected:
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BaseIsolate()
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: top_resource_(NULL),
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current_zone_(NULL),
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#if defined(DEBUG)
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top_handle_scope_(NULL),
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no_handle_scope_depth_(0),
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no_safepoint_scope_depth_(0),
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#endif
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no_callback_scope_depth_(0)
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{}
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~BaseIsolate() {
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// Do not delete stack resources: top_resource_ and current_zone_.
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}
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StackResource* top_resource_;
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Zone* current_zone_;
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#if defined(DEBUG)
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HandleScope* top_handle_scope_;
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int32_t no_handle_scope_depth_;
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int32_t no_safepoint_scope_depth_;
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#endif
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int32_t no_callback_scope_depth_;
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private:
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DISALLOW_COPY_AND_ASSIGN(BaseIsolate);
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};
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} // namespace dart
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#endif // VM_BASE_ISOLATE_H_
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