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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* 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/. */
#ifndef jsatominlines_h
#define jsatominlines_h
#include "mozilla/PodOperations.h"
#include "mozilla/RangedPtr.h"
#include "jsatom.h"
#include "jscntxt.h"
#include "jsnum.h"
#include "jsobj.h"
#include "jsstr.h"
#include "gc/Barrier.h"
#include "vm/String.h"
inline JSAtom *
js::AtomStateEntry::asPtr() const
{
JS_ASSERT(bits != 0);
JSAtom *atom = reinterpret_cast<JSAtom *>(bits & NO_TAG_MASK);
JSString::readBarrier(atom);
return atom;
}
namespace js {
inline jsid
AtomToId(JSAtom *atom)
{
JS_STATIC_ASSERT(JSID_INT_MIN == 0);
uint32_t index;
if (atom->isIndex(&index) && index <= JSID_INT_MAX)
return INT_TO_JSID(int32_t(index));
return JSID_FROM_BITS(size_t(atom));
}
template <AllowGC allowGC>
inline bool
ValueToId(JSContext* cx, typename MaybeRooted<Value, allowGC>::HandleType v,
typename MaybeRooted<jsid, allowGC>::MutableHandleType idp)
{
int32_t i;
if (ValueFitsInInt32(v, &i) && INT_FITS_IN_JSID(i)) {
idp.set(INT_TO_JSID(i));
return true;
}
JSAtom *atom = ToAtom<allowGC>(cx, v);
if (!atom)
return false;
idp.set(AtomToId(atom));
return true;
}
/*
* Write out character representing |index| to the memory just before |end|.
* Thus |*end| is not touched, but |end[-1]| and earlier are modified as
* appropriate. There must be at least js::UINT32_CHAR_BUFFER_LENGTH elements
* before |end| to avoid buffer underflow. The start of the characters written
* is returned and is necessarily before |end|.
*/
template <typename T>
inline mozilla::RangedPtr<T>
BackfillIndexInCharBuffer(uint32_t index, mozilla::RangedPtr<T> end)
{
#ifdef DEBUG
/*
* Assert that the buffer we're filling will hold as many characters as we
* could write out, by dereferencing the index that would hold the most
* significant digit.
*/
(void) *(end - UINT32_CHAR_BUFFER_LENGTH);
#endif
do {
uint32_t next = index / 10, digit = index % 10;
*--end = '0' + digit;
index = next;
} while (index > 0);
return end;
}
template <AllowGC allowGC>
bool
IndexToIdSlow(JSContext *cx, uint32_t index,
typename MaybeRooted<jsid, allowGC>::MutableHandleType idp);
inline bool
IndexToId(JSContext *cx, uint32_t index, MutableHandleId idp)
{
MaybeCheckStackRoots(cx);
if (index <= JSID_INT_MAX) {
idp.set(INT_TO_JSID(index));
return true;
}
return IndexToIdSlow<CanGC>(cx, index, idp);
}
inline bool
IndexToIdNoGC(JSContext *cx, uint32_t index, jsid *idp)
{
if (index <= JSID_INT_MAX) {
*idp = INT_TO_JSID(index);
return true;
}
return IndexToIdSlow<NoGC>(cx, index, idp);
}
static JS_ALWAYS_INLINE JSFlatString *
IdToString(JSContext *cx, jsid id)
{
if (JSID_IS_STRING(id))
return JSID_TO_ATOM(id);
if (JS_LIKELY(JSID_IS_INT(id)))
return Int32ToString<CanGC>(cx, JSID_TO_INT(id));
RootedValue idv(cx, IdToValue(id));
JSString *str = ToStringSlow<CanGC>(cx, idv);
if (!str)
return NULL;
return str->ensureFlat(cx);
}
inline
AtomHasher::Lookup::Lookup(const JSAtom *atom)
: chars(atom->chars()), length(atom->length()), atom(atom)
{}
inline bool
AtomHasher::match(const AtomStateEntry &entry, const Lookup &lookup)
{
JSAtom *key = entry.asPtr();
if (lookup.atom)
return lookup.atom == key;
if (key->length() != lookup.length)
return false;
return mozilla::PodEqual(key->chars(), lookup.chars, lookup.length);
}
inline Handle<PropertyName*>
TypeName(JSType type, JSRuntime *rt)
{
JS_ASSERT(type < JSTYPE_LIMIT);
JS_STATIC_ASSERT(offsetof(JSAtomState, undefined) +
JSTYPE_LIMIT * sizeof(FixedHeapPtr<PropertyName>) <=
sizeof(JSAtomState));
JS_STATIC_ASSERT(JSTYPE_VOID == 0);
return (&rt->atomState.undefined)[type];
}
inline Handle<PropertyName*>
TypeName(JSType type, JSContext *cx)
{
return TypeName(type, cx->runtime());
}
inline Handle<PropertyName*>
ClassName(JSProtoKey key, JSContext *cx)
{
JS_ASSERT(key < JSProto_LIMIT);
JS_STATIC_ASSERT(offsetof(JSAtomState, Null) +
JSProto_LIMIT * sizeof(FixedHeapPtr<PropertyName>) <=
sizeof(JSAtomState));
JS_STATIC_ASSERT(JSProto_Null == 0);
return (&cx->runtime()->atomState.Null)[key];
}
} // namespace js
#endif /* jsatominlines_h */
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