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0cc70c4a7c
In addition, this removes support for seeding the VM isolate snapshot with Instructions and referencing those Instructions in the isolate snapshot. This was leftover from an earlier experiment to share Instructions between a Core-JIT snapshot and App-JIT snapshots. Removing this reclaims the sign bit on Instruction offsets. Add missing cases to TypeTestingStubFinder::StubNameFromAddresss. Change-Id: Ie87216b4e284db1dc3eddb12f38ddbe8a841d312 Reviewed-on: https://dart-review.googlesource.com/50620 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com>
31 lines
1,008 B
C++
31 lines
1,008 B
C++
// Copyright (c) 2018, 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_HASH_H_
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#define RUNTIME_VM_HASH_H_
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namespace dart {
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static uint32_t CombineHashes(uint32_t hash, uint32_t other_hash) {
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hash += other_hash;
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hash += hash << 10;
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hash ^= hash >> 6; // Logical shift, unsigned hash.
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return hash;
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}
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static uint32_t FinalizeHash(uint32_t hash, intptr_t hashbits) {
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hash += hash << 3;
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hash ^= hash >> 11; // Logical shift, unsigned hash.
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hash += hash << 15;
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// FinalizeHash gets called with values for hashbits that are bigger than 31
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// (like kBitsPerWord - 1). Therefore we are careful to use a type
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// (uintptr_t) big enough to avoid undefined behavior with the left shift.
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hash &= (static_cast<uintptr_t>(1) << hashbits) - 1;
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return (hash == 0) ? 1 : hash;
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}
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} // namespace dart
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#endif // RUNTIME_VM_HASH_H_
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