62 lines
2.8 KiB
Diff
62 lines
2.8 KiB
Diff
diff -up chromium-65.0.3325.146/third_party/WebKit/Source/platform/heap/TraceTraits.h.oilpan chromium-65.0.3325.146/third_party/WebKit/Source/platform/heap/TraceTraits.h
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--- chromium-65.0.3325.146/third_party/WebKit/Source/platform/heap/TraceTraits.h.oilpan 2018-03-13 16:45:40.613426445 -0400
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+++ chromium-65.0.3325.146/third_party/WebKit/Source/platform/heap/TraceTraits.h 2018-03-13 16:45:49.946244905 -0400
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@@ -18,6 +18,7 @@
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#include "platform/wtf/HashTable.h"
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#include "platform/wtf/LinkedHashSet.h"
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#include "platform/wtf/ListHashSet.h"
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+#include "platform/wtf/Optional.h"
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#include "platform/wtf/TypeTraits.h"
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namespace blink {
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@@ -325,6 +326,23 @@ class TraceTrait<std::pair<T, U>> {
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}
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};
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+// While using Optional<T> with garbage-collected types is generally disallowed
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+// by the OptionalGarbageCollected check in blink_gc_plugin, garbage-collected
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+// containers such as HeapVector are allowed and need to be traced.
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+template <typename T>
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+class TraceTrait<WTF::Optional<T>> {
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+ STATIC_ONLY(TraceTrait);
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+
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+ public:
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+ template <typename VisitorDispatcher>
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+ static void Trace(VisitorDispatcher visitor, WTF::Optional<T>* optional) {
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+ if (*optional != WTF::nullopt) {
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+ TraceIfEnabled<T, WTF::IsTraceable<T>::value>::Trace(visitor,
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+ optional->value());
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+ }
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+ }
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+};
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+
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// If eager tracing leads to excessively deep |trace()| call chains (and
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// the system stack usage that this brings), the marker implementation will
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// switch to using an explicit mark stack. Recursive and deep object graphs
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diff -up chromium-65.0.3325.146/third_party/WebKit/Source/platform/wtf/Optional.h.oilpan chromium-65.0.3325.146/third_party/WebKit/Source/platform/wtf/Optional.h
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--- chromium-65.0.3325.146/third_party/WebKit/Source/platform/wtf/Optional.h.oilpan 2018-03-13 16:46:01.683015951 -0400
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+++ chromium-65.0.3325.146/third_party/WebKit/Source/platform/wtf/Optional.h 2018-03-13 16:46:51.632043375 -0400
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@@ -7,20 +7,15 @@
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#include "base/optional.h"
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#include "platform/wtf/TemplateUtil.h"
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-#include "platform/wtf/TypeTraits.h"
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namespace WTF {
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// WTF::Optional is base::Optional. See base/optional.h for documentation.
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//
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// A clang plugin enforces that garbage collected types are not allocated
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-// outside of the heap, similarly we enforce that one doesn't create garbage
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-// collected types nested inside an Optional.
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+// outside of the heap. GC containers such as HeapVector are allowed though.
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template <typename T>
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-using Optional =
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- typename std::enable_if<!IsGarbageCollectedType<T>::value ||
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- IsPersistentReferenceType<T>::value,
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- base::Optional<T>>::type;
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+using Optional = base::Optional<T>;
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constexpr base::nullopt_t nullopt = base::nullopt;
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constexpr base::in_place_t in_place = base::in_place;
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