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Fix ArrayBuffer storage and error types

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Basilisk-Dev 2026-05-15 21:42:53 -04:00 • committed by wuggy
commit b44a606987
3 changed files with 11 additions and 18 deletions
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2
js/src/js.msg
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@ -548,6 +548,8 @@ MSG_DEF(JSMSG_TOO_LONG_ARRAY, 0, JSEXN_TYPEERR, "Too long array")
// Typed array
MSG_DEF(JSMSG_BAD_INDEX, 0, JSEXN_RANGEERR, "invalid or out-of-range index")
MSG_DEF(JSMSG_ARRAYBUFFER_NOT_RESIZABLE, 0, JSEXN_TYPEERR, "ArrayBuffer is not resizable")
MSG_DEF(JSMSG_ARRAYBUFFER_CANNOT_DETACH, 0, JSEXN_TYPEERR, "ArrayBuffer cannot be detached")
MSG_DEF(JSMSG_NON_ARRAY_BUFFER_RETURNED, 0, JSEXN_TYPEERR, "expected ArrayBuffer, but species constructor returned non-ArrayBuffer")
MSG_DEF(JSMSG_SAME_ARRAY_BUFFER_RETURNED, 0, JSEXN_TYPEERR, "expected different ArrayBuffer, but species constructor returned same ArrayBuffer")
MSG_DEF(JSMSG_SHORT_ARRAY_BUFFER_RETURNED, 2, JSEXN_TYPEERR, "expected ArrayBuffer with at least {0} bytes, but species constructor returns ArrayBuffer with {1} bytes")

3
js/src/tests/non262/ArrayBuffer/resizable-transfer.js
View file

@ -5,6 +5,9 @@ assertEq(fixed.byteLength, 4);
assertEq(fixed.maxByteLength, 4);
assertEq(fixed.resizable, false);
assertEq(fixed.detached, false);
new Uint8Array(fixed).set([1, 2, 3, 4]);
fixed.extra = 17;
assertEq(Array.from(new Uint8Array(fixed)).join(","), "1,2,3,4");
assertThrowsInstanceOf(() => fixed.resize(2), TypeError);
assertEq(ArrayBuffer.prototype.transfer.length, 0);
assertEq(ArrayBuffer.prototype.transferToFixedLength.length, 0);

24
js/src/vm/ArrayBufferObject.cpp
View file

@ -409,14 +409,14 @@ AllocateArrayBufferContents(JSContext* cx, uint32_t nbytes)
static bool
ReportArrayBufferNotResizable(JSContext* cx)
{
JS_ReportErrorASCII(cx, "ArrayBuffer is not resizable");
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_ARRAYBUFFER_NOT_RESIZABLE);
return false;
}
static bool
ReportArrayBufferCannotDetach(JSContext* cx)
{
JS_ReportErrorASCII(cx, "ArrayBuffer cannot be detached");
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_ARRAYBUFFER_CANNOT_DETACH);
return false;
}
@ -1389,10 +1389,6 @@ ArrayBufferObject::create(JSContext* cx, uint32_t nbytes, BufferContents content
return nullptr;
}
// If we need to allocate data, try to use a larger object size class so
// that the array buffer's data can be allocated inline with the object.
// The extra space will be left unused by the object's fixed slots and
// available for the buffer's data, see NewObject().
size_t reservedSlots = JSCLASS_RESERVED_SLOTS(&class_);
size_t nslots = reservedSlots;
@ -1409,18 +1405,10 @@ ArrayBufferObject::create(JSContext* cx, uint32_t nbytes, BufferContents content
}
} else {
MOZ_ASSERT(ownsState == OwnsData);
size_t usableSlots = NativeObject::MAX_FIXED_SLOTS - reservedSlots;
if (nbytes <= usableSlots * sizeof(Value)) {
int newSlots = nbytes == 0 ? 0 : (nbytes - 1) / sizeof(Value) + 1;
MOZ_ASSERT(int(nbytes) <= newSlots * int(sizeof(Value)));
nslots = reservedSlots + newSlots;
contents = BufferContents::createPlain(nullptr);
} else {
contents = AllocateArrayBufferContents(cx, nbytes);
if (!contents)
return nullptr;
allocated = true;
}
contents = AllocateArrayBufferContents(cx, nbytes);
if (!contents)
return nullptr;
allocated = true;
}
MOZ_ASSERT(!(class_.flags & JSCLASS_HAS_PRIVATE));