fschneider@google.com
881060b433
After I enabled nullability tracking for checked mode type assertions, we need to fix type propagation for signature classes: We can't use the asserted type to infer a cid for those since it may cause unnecessary deoptimizations. R=vegorov@google.com Review URL: https://codereview.chromium.org//465343002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@39197 260f80e4-7a28-3924-810f-c04153c831b5
122 lines
3.7 KiB
C++
122 lines
3.7 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/cha.h"
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#include "vm/class_table.h"
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#include "vm/flags.h"
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#include "vm/freelist.h"
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#include "vm/object.h"
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#include "vm/raw_object.h"
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#include "vm/visitor.h"
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namespace dart {
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// Return true if the class is private to our internal libraries (not extendable
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// or implementable after startup). Therefore, we don't need to register
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// optimized code for invalidation for those classes.
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// TODO(fschneider): Allow more libraries.
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static bool IsKnownPrivateClass(const Class& type_class) {
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if (!Library::IsPrivate(String::Handle(type_class.Name()))) return false;
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const Library& library = Library::Handle(type_class.library());
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if (library.raw() == Library::CoreLibrary()) return true;
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if (library.raw() == Library::CollectionLibrary()) return true;
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if (library.raw() == Library::TypedDataLibrary()) return true;
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if (library.raw() == Library::MathLibrary()) return true;
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return false;
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}
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void CHA::AddToLeafClasses(const Class& cls) {
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if (IsKnownPrivateClass(cls)) return;
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for (intptr_t i = 0; i < leaf_classes_.length(); i++) {
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if (leaf_classes_[i]->raw() == cls.raw()) {
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return;
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}
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}
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leaf_classes_.Add(&Class::ZoneHandle(isolate_, cls.raw()));
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}
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bool CHA::HasSubclasses(const Class& cls) {
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ASSERT(!cls.IsNull());
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ASSERT(cls.id() >= kInstanceCid);
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// Can't track dependencies for classes on the VM heap since those are
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// read-only.
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// TODO(fschneider): Enable tracking of CHA dependent code for VM heap
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// classes.
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if (cls.InVMHeap()) return true;
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if (cls.IsObjectClass()) {
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// Class Object has subclasses, although we do not keep track of them.
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return true;
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}
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const GrowableObjectArray& direct_subclasses =
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GrowableObjectArray::Handle(isolate_, cls.direct_subclasses());
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bool result =
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!direct_subclasses.IsNull() && (direct_subclasses.Length() > 0);
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if (!result) {
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AddToLeafClasses(cls);
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}
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return result;
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}
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bool CHA::HasSubclasses(intptr_t cid) {
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const ClassTable& class_table = *isolate_->class_table();
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Class& cls = Class::Handle(isolate_, class_table.At(cid));
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return HasSubclasses(cls);
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}
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bool CHA::IsImplemented(const Class& cls) {
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// Signature classes have different type checking rules.
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ASSERT(!cls.IsSignatureClass());
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// Can't track dependencies for classes on the VM heap since those are
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// read-only.
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// TODO(fschneider): Enable tracking of CHA dependent code for VM heap
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// classes.
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if (cls.InVMHeap()) return true;
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bool result = cls.is_implemented();
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if (!result) {
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AddToLeafClasses(cls);
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}
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return result;
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}
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bool CHA::HasOverride(const Class& cls, const String& function_name) {
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const GrowableObjectArray& cls_direct_subclasses =
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GrowableObjectArray::Handle(isolate_, cls.direct_subclasses());
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// Subclasses of Object are not tracked by CHA. Safely assume that overrides
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// exist.
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if (cls.IsObjectClass()) {
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return true;
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}
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if (cls_direct_subclasses.IsNull()) {
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AddToLeafClasses(cls);
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return false;
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}
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Class& direct_subclass = Class::Handle(isolate_);
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for (intptr_t i = 0; i < cls_direct_subclasses.Length(); i++) {
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direct_subclass ^= cls_direct_subclasses.At(i);
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// Unfinalized classes are treated as non-existent for CHA purposes,
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// as that means that no instance of that class exists at runtime.
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if (direct_subclass.is_finalized() &&
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(direct_subclass.LookupDynamicFunction(function_name) !=
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Function::null())) {
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return true;
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}
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if (HasOverride(direct_subclass, function_name)) {
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return true;
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}
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}
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AddToLeafClasses(cls);
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return false;
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}
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} // namespace dart
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