Vyacheslav Egorov
beb7114861
This relands commit b0a71d364c
Cq-Include-Trybots: dart/try:vm-kernel-precomp-linux-release-simarm64-try,vm-kernel-precomp-linux-release-simarm-try,vm-kernel-linux-release-simarm64-try,vm-kernel-linux-release-simarm-try,vm-kernel-precomp-linux-release-x64-try
Change-Id: I1d32e5d0d44f4e422d188643b548ed81859f7d74
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/143807
Commit-Queue: Vyacheslav Egorov <vegorov@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
85 lines
2.8 KiB
C++
85 lines
2.8 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_COMPILER_CHA_H_
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#define RUNTIME_VM_COMPILER_CHA_H_
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#if defined(DART_PRECOMPILED_RUNTIME)
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#error "AOT runtime should not use compiler sources (including header files)"
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#endif // defined(DART_PRECOMPILED_RUNTIME)
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#include "vm/allocation.h"
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#include "vm/growable_array.h"
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#include "vm/thread.h"
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namespace dart {
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class Class;
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class CompileType;
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class Function;
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template <typename T>
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class ZoneGrowableArray;
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class String;
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class CHA : public ValueObject {
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public:
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explicit CHA(Thread* thread)
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: thread_(thread), guarded_classes_(thread->zone(), 1) {}
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// Returns true if the class has subclasses.
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static bool HasSubclasses(const Class& cls);
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bool HasSubclasses(intptr_t cid) const;
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// Collect the concrete subclasses of 'cls' into 'class_ids'. Return true if
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// the result is valid (may be invalid because we don't track the subclasses
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// of classes allocated in the VM isolate or class Object).
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static bool ConcreteSubclasses(const Class& cls,
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GrowableArray<intptr_t>* class_ids);
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// Return true if the class is implemented by some other class.
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static bool IsImplemented(const Class& cls);
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// Returns true if any subclass of 'cls' contains the function.
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// If no override was found subclass_count would contain total count of
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// finalized subclasses that CHA looked at.
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// This count will be used to validate CHA decision before installing
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// optimized code compiled in background.
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bool HasOverride(const Class& cls,
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const String& function_name,
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intptr_t* subclass_count);
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// Adds class 'cls' to the list of guarded classes, deoptimization occurs
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// if any of those classes gets subclassed through later loaded/finalized
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// libraries. Only classes that were used for CHA optimizations are added.
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void AddToGuardedClasses(const Class& cls, intptr_t subclass_count);
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// When compiling in background we need to check that no new finalized
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// subclasses were added to guarded classes.
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bool IsConsistentWithCurrentHierarchy() const;
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void RegisterDependencies(const Code& code) const;
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// Used for testing.
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bool IsGuardedClass(intptr_t cid) const;
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private:
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Thread* thread_;
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struct GuardedClassInfo {
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Class* cls;
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// Number of finalized subclasses that this class had at the moment
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// when CHA made the first decision based on this class.
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// Used to validate correctness of background compilation: if
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// any subclasses were added we will discard compiled code.
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intptr_t subclass_count;
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};
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GrowableArray<GuardedClassInfo> guarded_classes_;
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};
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} // namespace dart
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#endif // RUNTIME_VM_COMPILER_CHA_H_
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