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Issue #2304 - Part 1 - Prerequisite: Make Handle<Maybe<>> more convenient. This is required to implement JS::NothingHandleValue. https://bugzilla.mozilla.org/show_bug.cgi?id=1631114

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Brian Smith 2026-03-06 13:13:21 -06:00 • committed by OwnedByWuigi
commit 3c9bbc9665
3 changed files with 31 additions and 0 deletions
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28
js/public/RootingAPI.h
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@ -10,6 +10,7 @@
#include "mozilla/DebugOnly.h" #include "mozilla/DebugOnly.h"
#include "mozilla/GuardObjects.h" #include "mozilla/GuardObjects.h"
#include "mozilla/LinkedList.h" #include "mozilla/LinkedList.h"
#include "mozilla/Maybe.h"
#include "mozilla/Move.h" #include "mozilla/Move.h"
#include "mozilla/TypeTraits.h" #include "mozilla/TypeTraits.h"
@ -1278,6 +1279,33 @@ class MutableWrappedPtrOperations<UniquePtr<T, D>, Container>
void reset(T* ptr = T()) { uniquePtr().reset(ptr); } void reset(T* ptr = T()) { uniquePtr().reset(ptr); }
}; };
template <typename T, typename Container>
class WrappedPtrOperations<mozilla::Maybe<T>, Container> {
const mozilla::Maybe<T>& maybe() const {
return static_cast<const Container*>(this)->get();
}
public:
// This only supports a subset of Maybe's interface.
bool isSome() const { return maybe().isSome(); }
bool isNothing() const { return maybe().isNothing(); }
const T value() const { return maybe().value(); }
const T* operator->() const { return maybe().ptr(); }
const T& operator*() const { return maybe().ref(); }
};
template <typename T, typename Container>
class MutableWrappedPtrOperations<mozilla::Maybe<T>, Container>
: public WrappedPtrOperations<mozilla::Maybe<T>, Container> {
mozilla::Maybe<T>& maybe() { return static_cast<Container*>(this)->get(); }
public:
// This only supports a subset of Maybe's interface.
T* operator->() { return maybe().ptr(); }
T& operator*() { return maybe().ref(); }
void reset() { return maybe().reset(); }
};
namespace gc { namespace gc {
template <typename T, typename TraceCallbacks> template <typename T, typename TraceCallbacks>

1
js/public/Value.h
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@ -1535,6 +1535,7 @@ extern JS_PUBLIC_DATA(const HandleValue) NullHandleValue;
extern JS_PUBLIC_DATA(const HandleValue) UndefinedHandleValue; extern JS_PUBLIC_DATA(const HandleValue) UndefinedHandleValue;
extern JS_PUBLIC_DATA(const HandleValue) TrueHandleValue; extern JS_PUBLIC_DATA(const HandleValue) TrueHandleValue;
extern JS_PUBLIC_DATA(const HandleValue) FalseHandleValue; extern JS_PUBLIC_DATA(const HandleValue) FalseHandleValue;
extern JS_PUBLIC_DATA(const Handle<mozilla::Maybe<Value>>) NothingHandleValue;
} // namespace JS } // namespace JS

2
js/src/vm/Value.cpp
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@ -9,6 +9,7 @@ static const JS::Value JSVAL_NULL = JS::Value::fromTagAndPayload(JSVAL_TAG_NULL
static const JS::Value JSVAL_FALSE = JS::Value::fromTagAndPayload(JSVAL_TAG_BOOLEAN, false); static const JS::Value JSVAL_FALSE = JS::Value::fromTagAndPayload(JSVAL_TAG_BOOLEAN, false);
static const JS::Value JSVAL_TRUE = JS::Value::fromTagAndPayload(JSVAL_TAG_BOOLEAN, true); static const JS::Value JSVAL_TRUE = JS::Value::fromTagAndPayload(JSVAL_TAG_BOOLEAN, true);
static const JS::Value JSVAL_VOID = JS::Value::fromTagAndPayload(JSVAL_TAG_UNDEFINED, 0); static const JS::Value JSVAL_VOID = JS::Value::fromTagAndPayload(JSVAL_TAG_UNDEFINED, 0);
static const mozilla::Maybe<JS::Value> JSVAL_NOTHING;
namespace JS { namespace JS {
@ -16,5 +17,6 @@ const HandleValue NullHandleValue = HandleValue::fromMarkedLocation(&JSVAL_NULL)
const HandleValue UndefinedHandleValue = HandleValue::fromMarkedLocation(&JSVAL_VOID); const HandleValue UndefinedHandleValue = HandleValue::fromMarkedLocation(&JSVAL_VOID);
const HandleValue TrueHandleValue = HandleValue::fromMarkedLocation(&JSVAL_TRUE); const HandleValue TrueHandleValue = HandleValue::fromMarkedLocation(&JSVAL_TRUE);
const HandleValue FalseHandleValue = HandleValue::fromMarkedLocation(&JSVAL_FALSE); const HandleValue FalseHandleValue = HandleValue::fromMarkedLocation(&JSVAL_FALSE);
const Handle<mozilla::Maybe<Value>> NothingHandleValue = Handle<mozilla::Maybe<Value>>::fromMarkedLocation(&JSVAL_NOTHING);
} // namespace JS } // namespace JS