1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/jsatominlines.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,192 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef jsatominlines_h
1.11 +#define jsatominlines_h
1.12 +
1.13 +#include "jsatom.h"
1.14 +
1.15 +#include "mozilla/PodOperations.h"
1.16 +#include "mozilla/RangedPtr.h"
1.17 +
1.18 +#include "jscntxt.h"
1.19 +#include "jsnum.h"
1.20 +
1.21 +#include "vm/String.h"
1.22 +
1.23 +inline JSAtom *
1.24 +js::AtomStateEntry::asPtr() const
1.25 +{
1.26 + JS_ASSERT(bits != 0);
1.27 + JSAtom *atom = reinterpret_cast<JSAtom *>(bits & NO_TAG_MASK);
1.28 + JSString::readBarrier(atom);
1.29 + return atom;
1.30 +}
1.31 +
1.32 +namespace js {
1.33 +
1.34 +inline jsid
1.35 +AtomToId(JSAtom *atom)
1.36 +{
1.37 + JS_STATIC_ASSERT(JSID_INT_MIN == 0);
1.38 +
1.39 + uint32_t index;
1.40 + if (atom->isIndex(&index) && index <= JSID_INT_MAX)
1.41 + return INT_TO_JSID(int32_t(index));
1.42 +
1.43 + return JSID_FROM_BITS(size_t(atom));
1.44 +}
1.45 +
1.46 +inline bool
1.47 +ValueToIdPure(const Value &v, jsid *id)
1.48 +{
1.49 + int32_t i;
1.50 + if (ValueFitsInInt32(v, &i) && INT_FITS_IN_JSID(i)) {
1.51 + *id = INT_TO_JSID(i);
1.52 + return true;
1.53 + }
1.54 +
1.55 + if (!v.isString() || !v.toString()->isAtom())
1.56 + return false;
1.57 +
1.58 + *id = AtomToId(&v.toString()->asAtom());
1.59 + return true;
1.60 +}
1.61 +
1.62 +template <AllowGC allowGC>
1.63 +inline bool
1.64 +ValueToId(JSContext* cx, typename MaybeRooted<Value, allowGC>::HandleType v,
1.65 + typename MaybeRooted<jsid, allowGC>::MutableHandleType idp)
1.66 +{
1.67 + int32_t i;
1.68 + if (ValueFitsInInt32(v, &i) && INT_FITS_IN_JSID(i)) {
1.69 + idp.set(INT_TO_JSID(i));
1.70 + return true;
1.71 + }
1.72 +
1.73 + JSAtom *atom = ToAtom<allowGC>(cx, v);
1.74 + if (!atom)
1.75 + return false;
1.76 +
1.77 + idp.set(AtomToId(atom));
1.78 + return true;
1.79 +}
1.80 +
1.81 +/*
1.82 + * Write out character representing |index| to the memory just before |end|.
1.83 + * Thus |*end| is not touched, but |end[-1]| and earlier are modified as
1.84 + * appropriate. There must be at least js::UINT32_CHAR_BUFFER_LENGTH elements
1.85 + * before |end| to avoid buffer underflow. The start of the characters written
1.86 + * is returned and is necessarily before |end|.
1.87 + */
1.88 +template <typename T>
1.89 +inline mozilla::RangedPtr<T>
1.90 +BackfillIndexInCharBuffer(uint32_t index, mozilla::RangedPtr<T> end)
1.91 +{
1.92 +#ifdef DEBUG
1.93 + /*
1.94 + * Assert that the buffer we're filling will hold as many characters as we
1.95 + * could write out, by dereferencing the index that would hold the most
1.96 + * significant digit.
1.97 + */
1.98 + (void) *(end - UINT32_CHAR_BUFFER_LENGTH);
1.99 +#endif
1.100 +
1.101 + do {
1.102 + uint32_t next = index / 10, digit = index % 10;
1.103 + *--end = '0' + digit;
1.104 + index = next;
1.105 + } while (index > 0);
1.106 +
1.107 + return end;
1.108 +}
1.109 +
1.110 +bool
1.111 +IndexToIdSlow(ExclusiveContext *cx, uint32_t index, MutableHandleId idp);
1.112 +
1.113 +inline bool
1.114 +IndexToId(ExclusiveContext *cx, uint32_t index, MutableHandleId idp)
1.115 +{
1.116 + if (index <= JSID_INT_MAX) {
1.117 + idp.set(INT_TO_JSID(index));
1.118 + return true;
1.119 + }
1.120 +
1.121 + return IndexToIdSlow(cx, index, idp);
1.122 +}
1.123 +
1.124 +static MOZ_ALWAYS_INLINE JSFlatString *
1.125 +IdToString(JSContext *cx, jsid id)
1.126 +{
1.127 + if (JSID_IS_STRING(id))
1.128 + return JSID_TO_ATOM(id);
1.129 +
1.130 + if (MOZ_LIKELY(JSID_IS_INT(id)))
1.131 + return Int32ToString<CanGC>(cx, JSID_TO_INT(id));
1.132 +
1.133 + RootedValue idv(cx, IdToValue(id));
1.134 + JSString *str = ToStringSlow<CanGC>(cx, idv);
1.135 + if (!str)
1.136 + return nullptr;
1.137 +
1.138 + return str->ensureFlat(cx);
1.139 +}
1.140 +
1.141 +inline
1.142 +AtomHasher::Lookup::Lookup(const JSAtom *atom)
1.143 + : chars(atom->chars()), length(atom->length()), atom(atom)
1.144 +{
1.145 + hash = mozilla::HashString(chars, length);
1.146 +}
1.147 +
1.148 +inline bool
1.149 +AtomHasher::match(const AtomStateEntry &entry, const Lookup &lookup)
1.150 +{
1.151 + JSAtom *key = entry.asPtr();
1.152 + if (lookup.atom)
1.153 + return lookup.atom == key;
1.154 + if (key->length() != lookup.length)
1.155 + return false;
1.156 + return mozilla::PodEqual(key->chars(), lookup.chars, lookup.length);
1.157 +}
1.158 +
1.159 +inline Handle<PropertyName*>
1.160 +TypeName(JSType type, const JSAtomState &names)
1.161 +{
1.162 + JS_ASSERT(type < JSTYPE_LIMIT);
1.163 + JS_STATIC_ASSERT(offsetof(JSAtomState, undefined) +
1.164 + JSTYPE_LIMIT * sizeof(FixedHeapPtr<PropertyName>) <=
1.165 + sizeof(JSAtomState));
1.166 + JS_STATIC_ASSERT(JSTYPE_VOID == 0);
1.167 + return (&names.undefined)[type];
1.168 +}
1.169 +
1.170 +inline Handle<PropertyName*>
1.171 +ClassName(JSProtoKey key, JSAtomState &atomState)
1.172 +{
1.173 + JS_ASSERT(key < JSProto_LIMIT);
1.174 + JS_STATIC_ASSERT(offsetof(JSAtomState, Null) +
1.175 + JSProto_LIMIT * sizeof(FixedHeapPtr<PropertyName>) <=
1.176 + sizeof(JSAtomState));
1.177 + JS_STATIC_ASSERT(JSProto_Null == 0);
1.178 + return (&atomState.Null)[key];
1.179 +}
1.180 +
1.181 +inline Handle<PropertyName*>
1.182 +ClassName(JSProtoKey key, JSRuntime *rt)
1.183 +{
1.184 + return ClassName(key, *rt->commonNames);
1.185 +}
1.186 +
1.187 +inline Handle<PropertyName*>
1.188 +ClassName(JSProtoKey key, ExclusiveContext *cx)
1.189 +{
1.190 + return ClassName(key, cx->names());
1.191 +}
1.192 +
1.193 +} // namespace js
1.194 +
1.195 +#endif /* jsatominlines_h */
