зеркало из https://github.com/mozilla/gecko-dev.git
102 строки
3.3 KiB
C++
102 строки
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
* vim: set ts=8 sts=2 et sw=2 tw=80:
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/** GC-safe representations of consecutive JS::Value in memory. */
|
|
|
|
#ifndef js_ValueArray_h
|
|
#define js_ValueArray_h
|
|
|
|
#include "mozilla/Assertions.h" // MOZ_ASSERT
|
|
#include "mozilla/Attributes.h" // MOZ_IMPLICIT, MOZ_RAII
|
|
#include "mozilla/GuardObjects.h" // MOZ_GUARD_OBJECT_NOTIFIER_{INIT,PARAM}, MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
|
|
|
|
#include <stdint.h> // size_t
|
|
|
|
#include "js/CallArgs.h" // JS::CallArgs
|
|
#include "js/GCVector.h" // JS::RootedVector
|
|
#include "js/RootingAPI.h" // JS::AutoGCRooter, JS::{,Mutable}Handle
|
|
#include "js/Value.h" // JS::Value
|
|
|
|
namespace JS {
|
|
|
|
/** AutoValueArray roots an internal fixed-size array of Values. */
|
|
template <size_t N>
|
|
class MOZ_RAII AutoValueArray : public AutoGCRooter {
|
|
const size_t length_;
|
|
Value elements_[N];
|
|
|
|
public:
|
|
explicit AutoValueArray(JSContext* cx MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
|
|
: AutoGCRooter(cx, AutoGCRooter::Tag::ValueArray), length_(N) {
|
|
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
|
|
}
|
|
|
|
unsigned length() const { return length_; }
|
|
const Value* begin() const { return elements_; }
|
|
Value* begin() { return elements_; }
|
|
|
|
Handle<Value> operator[](unsigned i) const {
|
|
MOZ_ASSERT(i < N);
|
|
return Handle<Value>::fromMarkedLocation(&elements_[i]);
|
|
}
|
|
MutableHandle<Value> operator[](unsigned i) {
|
|
MOZ_ASSERT(i < N);
|
|
return MutableHandleValue::fromMarkedLocation(&elements_[i]);
|
|
}
|
|
|
|
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
|
|
};
|
|
|
|
/** A handle to an array of rooted values. */
|
|
class HandleValueArray {
|
|
const size_t length_;
|
|
const Value* const elements_;
|
|
|
|
HandleValueArray(size_t len, const Value* elements)
|
|
: length_(len), elements_(elements) {}
|
|
|
|
public:
|
|
explicit HandleValueArray(Handle<Value> value)
|
|
: length_(1), elements_(value.address()) {}
|
|
|
|
MOZ_IMPLICIT HandleValueArray(const RootedVector<Value>& values)
|
|
: length_(values.length()), elements_(values.begin()) {}
|
|
|
|
template <size_t N>
|
|
MOZ_IMPLICIT HandleValueArray(const AutoValueArray<N>& values)
|
|
: length_(N), elements_(values.begin()) {}
|
|
|
|
/** CallArgs must already be rooted somewhere up the stack. */
|
|
MOZ_IMPLICIT HandleValueArray(const JS::CallArgs& args)
|
|
: length_(args.length()), elements_(args.array()) {}
|
|
|
|
/** Use with care! Only call this if the data is guaranteed to be marked. */
|
|
static HandleValueArray fromMarkedLocation(size_t len,
|
|
const Value* elements) {
|
|
return HandleValueArray(len, elements);
|
|
}
|
|
|
|
static HandleValueArray subarray(const HandleValueArray& values,
|
|
size_t startIndex, size_t len) {
|
|
MOZ_ASSERT(startIndex + len <= values.length());
|
|
return HandleValueArray(len, values.begin() + startIndex);
|
|
}
|
|
|
|
static HandleValueArray empty() { return HandleValueArray(0, nullptr); }
|
|
|
|
size_t length() const { return length_; }
|
|
const Value* begin() const { return elements_; }
|
|
|
|
Handle<Value> operator[](size_t i) const {
|
|
MOZ_ASSERT(i < length_);
|
|
return Handle<Value>::fromMarkedLocation(&elements_[i]);
|
|
}
|
|
};
|
|
|
|
} // namespace JS
|
|
|
|
#endif // js_ValueArray_h
|