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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
*
* Copyright 2023 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "wasm/WasmAnyRef.h"
#include "vm/JSContext.h"
#include "vm/JSObject.h"
#include "vm/NativeObject.h"
#include "vm/JSObject-inl.h"
using namespace js;
using namespace js::wasm;
class WasmValueBox : public NativeObject {
public:
static const unsigned VALUE_SLOT = 0;
static const unsigned RESERVED_SLOTS = 1;
static const JSClass class_;
static WasmValueBox* create(JSContext* cx, HandleValue value);
Value value() const { return getFixedSlot(VALUE_SLOT); }
};
const JSClass WasmValueBox::class_ = {
"WasmValueBox", JSCLASS_HAS_RESERVED_SLOTS(RESERVED_SLOTS)};
WasmValueBox* WasmValueBox::create(JSContext* cx, HandleValue value) {
WasmValueBox* obj = NewObjectWithGivenProto<WasmValueBox>(cx, nullptr);
if (!obj) {
return nullptr;
}
obj->setFixedSlot(VALUE_SLOT, value);
return obj;
}
const JSClass* AnyRef::valueBoxClass() { return &WasmValueBox::class_; }
size_t AnyRef::valueBoxOffsetOfValue() {
return NativeObject::getFixedSlotOffset(WasmValueBox::VALUE_SLOT);
}
bool AnyRef::fromJSValue(JSContext* cx, HandleValue value,
MutableHandleAnyRef result) {
if (value.isNull()) {
result.set(AnyRef::null());
return true;
}
if (value.isString()) {
JSString* string = value.toString();
result.set(AnyRef::fromJSString(string));
return true;
}
if (value.isObject()) {
JSObject& obj = value.toObject();
MOZ_ASSERT(!obj.is<WasmValueBox>());
MOZ_ASSERT(obj.compartment() == cx->compartment());
result.set(AnyRef::fromJSObject(obj));
return true;
}
if (value.isInt32() && !int32NeedsBoxing(value.toInt32())) {
result.set(AnyRef::fromInt32(value.toInt32()));
return true;
}
if (value.isDouble()) {
double doubleValue = value.toDouble();
int32_t intValue;
if (mozilla::NumberIsInt32(doubleValue, &intValue) &&
!int32NeedsBoxing(intValue)) {
result.set(AnyRef::fromInt32(intValue));
return true;
}
}
JSObject* box = AnyRef::boxValue(cx, value);
if (!box) {
return false;
}
result.set(AnyRef::fromJSObject(*box));
return true;
}
JSObject* AnyRef::boxValue(JSContext* cx, HandleValue value) {
MOZ_ASSERT(AnyRef::valueNeedsBoxing(value));
return WasmValueBox::create(cx, value);
}
Value wasm::AnyRef::toJSValue() const {
// If toJSValue needs to allocate then we need a more complicated API, and
// we need to root the value in the callers, see comments in callExport().
Value value;
if (isNull()) {
value.setNull();
} else if (isJSString()) {
value.setString(toJSString());
} else if (isI31()) {
value.setInt32(toI31());
} else {
JSObject& obj = toJSObject();
if (obj.is<WasmValueBox>()) {
value = obj.as<WasmValueBox>().value();
} else {
value.setObject(obj);
}
}
return value;
}