Ryan Macnak
6fe15f6df9
This works around bugs in UndefinedBehaviorSanitizer and Clang. Bug: b/28638298 Change-Id: I6be595f9664516019d28017d24559583a1ae3a21 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/144354 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
57 lines
1.7 KiB
C++
57 lines
1.7 KiB
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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#include "vm/reverse_pc_lookup_cache.h"
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#include "vm/isolate.h"
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namespace dart {
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#if defined(DART_PRECOMPILED_RUNTIME)
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static uword BeginPcFromCode(const CodePtr code) {
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return Code::PayloadStartOf(code);
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}
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static uword EndPcFromCode(const CodePtr code) {
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return Code::PayloadStartOf(code) + Code::PayloadSizeOf(code);
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}
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void ReversePcLookupCache::BuildAndAttachToIsolateGroup(
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IsolateGroup* isolate_group) {
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// This should be called once when the isolate group is created.
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ASSERT(isolate_group->reverse_pc_lookup_cache() == nullptr);
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auto object_store = isolate_group->object_store();
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auto& array = Array::Handle(object_store->code_order_table());
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if (!array.IsNull()) {
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const intptr_t length = array.Length();
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{
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NoSafepointScope no_safepoint_scope;
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const uword begin = BeginPcFromCode(static_cast<CodePtr>(array.At(0)));
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const uword end =
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EndPcFromCode(static_cast<CodePtr>(array.At(length - 1)));
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auto pc_array = new uint32_t[length];
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for (intptr_t i = 0; i < length; i++) {
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const auto end_pc = EndPcFromCode(static_cast<CodePtr>(array.At(i)));
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pc_array[i] = end_pc - begin;
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}
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#if defined(DEBUG)
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for (intptr_t i = 1; i < length; i++) {
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ASSERT(pc_array[i - 1] <= pc_array[i]);
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}
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#endif // defined(DEBUG)
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auto cache =
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new ReversePcLookupCache(isolate_group, pc_array, length, begin, end);
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isolate_group->set_reverse_pc_lookup_cache(cache);
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}
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}
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}
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#endif // defined(DART_PRECOMPILED_RUNTIME)
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} // namespace dart
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