js/src/vm/StringBuffer.cpp@6474c204b198 (annotated)
js/src/vm/StringBuffer.cpp
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| michael@0 | 2 | * vim: set ts=8 sts=4 et sw=4 tw=99: |
| michael@0 | 3 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #include "vm/StringBuffer.h" |
| michael@0 | 8 | |
| michael@0 | 9 | #include "jsobjinlines.h" |
| michael@0 | 10 | |
| michael@0 | 11 | #include "vm/String-inl.h" |
| michael@0 | 12 | |
| michael@0 | 13 | using namespace js; |
| michael@0 | 14 | |
| michael@0 | 15 | jschar * |
| michael@0 | 16 | StringBuffer::extractWellSized() |
| michael@0 | 17 | { |
| michael@0 | 18 | size_t capacity = cb.capacity(); |
| michael@0 | 19 | size_t length = cb.length(); |
| michael@0 | 20 | |
| michael@0 | 21 | jschar *buf = cb.extractRawBuffer(); |
| michael@0 | 22 | if (!buf) |
| michael@0 | 23 | return nullptr; |
| michael@0 | 24 | |
| michael@0 | 25 | /* For medium/big buffers, avoid wasting more than 1/4 of the memory. */ |
| michael@0 | 26 | JS_ASSERT(capacity >= length); |
| michael@0 | 27 | if (length > CharBuffer::sMaxInlineStorage && capacity - length > length / 4) { |
| michael@0 | 28 | size_t bytes = sizeof(jschar) * (length + 1); |
| michael@0 | 29 | ExclusiveContext *cx = context(); |
| michael@0 | 30 | jschar *tmp = (jschar *)cx->realloc_(buf, bytes); |
| michael@0 | 31 | if (!tmp) { |
| michael@0 | 32 | js_free(buf); |
| michael@0 | 33 | return nullptr; |
| michael@0 | 34 | } |
| michael@0 | 35 | buf = tmp; |
| michael@0 | 36 | } |
| michael@0 | 37 | |
| michael@0 | 38 | return buf; |
| michael@0 | 39 | } |
| michael@0 | 40 | |
| michael@0 | 41 | JSFlatString * |
| michael@0 | 42 | StringBuffer::finishString() |
| michael@0 | 43 | { |
| michael@0 | 44 | ExclusiveContext *cx = context(); |
| michael@0 | 45 | if (cb.empty()) |
| michael@0 | 46 | return cx->names().empty; |
| michael@0 | 47 | |
| michael@0 | 48 | size_t length = cb.length(); |
| michael@0 | 49 | if (!JSString::validateLength(cx, length)) |
| michael@0 | 50 | return nullptr; |
| michael@0 | 51 | |
| michael@0 | 52 | JS_STATIC_ASSERT(JSFatInlineString::MAX_FAT_INLINE_LENGTH < CharBuffer::InlineLength); |
| michael@0 | 53 | if (JSFatInlineString::lengthFits(length)) |
| michael@0 | 54 | return NewFatInlineString<CanGC>(cx, TwoByteChars(cb.begin(), length)); |
| michael@0 | 55 | |
| michael@0 | 56 | if (!cb.append('\0')) |
| michael@0 | 57 | return nullptr; |
| michael@0 | 58 | |
| michael@0 | 59 | jschar *buf = extractWellSized(); |
| michael@0 | 60 | if (!buf) |
| michael@0 | 61 | return nullptr; |
| michael@0 | 62 | |
| michael@0 | 63 | JSFlatString *str = js_NewString<CanGC>(cx, buf, length); |
| michael@0 | 64 | if (!str) |
| michael@0 | 65 | js_free(buf); |
| michael@0 | 66 | return str; |
| michael@0 | 67 | } |
| michael@0 | 68 | |
| michael@0 | 69 | JSAtom * |
| michael@0 | 70 | StringBuffer::finishAtom() |
| michael@0 | 71 | { |
| michael@0 | 72 | ExclusiveContext *cx = context(); |
| michael@0 | 73 | |
| michael@0 | 74 | size_t length = cb.length(); |
| michael@0 | 75 | if (length == 0) |
| michael@0 | 76 | return cx->names().empty; |
| michael@0 | 77 | |
| michael@0 | 78 | JSAtom *atom = AtomizeChars(cx, cb.begin(), length); |
| michael@0 | 79 | cb.clear(); |
| michael@0 | 80 | return atom; |
| michael@0 | 81 | } |
| michael@0 | 82 | |
| michael@0 | 83 | bool |
| michael@0 | 84 | js::ValueToStringBufferSlow(JSContext *cx, const Value &arg, StringBuffer &sb) |
| michael@0 | 85 | { |
| michael@0 | 86 | RootedValue v(cx, arg); |
| michael@0 | 87 | if (!ToPrimitive(cx, JSTYPE_STRING, &v)) |
| michael@0 | 88 | return false; |
| michael@0 | 89 | |
| michael@0 | 90 | if (v.isString()) |
| michael@0 | 91 | return sb.append(v.toString()); |
| michael@0 | 92 | if (v.isNumber()) |
| michael@0 | 93 | return NumberValueToStringBuffer(cx, v, sb); |
| michael@0 | 94 | if (v.isBoolean()) |
| michael@0 | 95 | return BooleanToStringBuffer(v.toBoolean(), sb); |
| michael@0 | 96 | if (v.isNull()) |
| michael@0 | 97 | return sb.append(cx->names().null); |
| michael@0 | 98 | JS_ASSERT(v.isUndefined()); |
| michael@0 | 99 | return sb.append(cx->names().undefined); |
| michael@0 | 100 | } |
