Ahmed Ashour
99f0fb5b70
Fixes #49364 TEST=ci Change-Id: Ic643819c9cdd7b56690981b96b854b1e8d622fff Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/250160 Reviewed-by: Ryan Macnak <rmacnak@google.com> Reviewed-by: Lasse Nielsen <lrn@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com> Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
53 lines
1.7 KiB
C++
53 lines
1.7 KiB
C++
// Copyright (c) 2020, 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_API_DEOPT_ID_H_
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#define RUNTIME_VM_COMPILER_API_DEOPT_ID_H_
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#include "platform/allocation.h"
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namespace dart {
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// Deoptimization Id logic.
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//
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// Deoptimization ids are used to refer to deoptimization points, at which
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// control can enter unoptimized code from the optimized version of the code.
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//
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// Note: any instruction that does a call has two deoptimization points,
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// one before the call and one after the call - so that we could deoptimize
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// to either before or after the call depending on whether the same call
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// already occurred in the optimized code (and potentially produced
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// observable side-effects) or not.
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//
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// To simplify implementation we always allocate two deopt ids (one for before
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// point and one for the after point).
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class DeoptId : public AllStatic {
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public:
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static constexpr intptr_t kNone = -1;
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static inline intptr_t Next(intptr_t deopt_id) { return deopt_id + kStep; }
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static inline intptr_t ToDeoptAfter(intptr_t deopt_id) {
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ASSERT(IsDeoptBefore(deopt_id));
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return deopt_id + kAfterOffset;
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}
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static inline bool IsDeoptBefore(intptr_t deopt_id) {
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return (deopt_id % kStep) == kBeforeOffset;
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}
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static inline bool IsDeoptAfter(intptr_t deopt_id) {
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return (deopt_id % kStep) == kAfterOffset;
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}
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private:
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static constexpr intptr_t kStep = 2;
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static constexpr intptr_t kBeforeOffset = 0;
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static constexpr intptr_t kAfterOffset = 1;
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};
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} // namespace dart
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#endif // RUNTIME_VM_COMPILER_API_DEOPT_ID_H_
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