The Tor Browser: js/src/vm/String-inl.h@6474c204b198 (annotated)

js/src/vm/String-inl.h@6474c204b198 (annotated)

js/src/vm/String-inl.h

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.

 /* -*- 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 vm_String_inl_h
 #define vm_String_inl_h
 #include "vm/String.h"
 #include "mozilla/PodOperations.h"
 #include "jscntxt.h"
 #include "gc/Marking.h"
 #include "jsgcinlines.h"
 namespace js {
 template <AllowGC allowGC>
 static MOZ_ALWAYS_INLINE JSInlineString *
 NewFatInlineString(ThreadSafeContext *cx, JS::Latin1Chars chars)
 {
     size_t len = chars.length();
     JS_ASSERT(JSFatInlineString::lengthFits(len));
     JSInlineString *str = JSInlineString::lengthFits(len)
                           ? JSInlineString::new_<allowGC>(cx)
                           : JSFatInlineString::new_<allowGC>(cx);
     if (!str)
         return nullptr;
     jschar *p = str->init(len);
     for (size_t i = 0; i < len; ++i)
         p[i] = static_cast<jschar>(chars[i]);
     p[len] = '\0';
     return str;
 }
 template <AllowGC allowGC>
 static MOZ_ALWAYS_INLINE JSInlineString *
 NewFatInlineString(ExclusiveContext *cx, JS::TwoByteChars chars)
 {
     size_t len = chars.length();
     /*
      * Don't bother trying to find a static atom; measurement shows that not
      * many get here (for one, Atomize is catching them).
      */
     JS_ASSERT(JSFatInlineString::lengthFits(len));
     JSInlineString *str = JSInlineString::lengthFits(len)
                           ? JSInlineString::new_<allowGC>(cx)
                           : JSFatInlineString::new_<allowGC>(cx);
     if (!str)
         return nullptr;
     jschar *storage = str->init(len);
     mozilla::PodCopy(storage, chars.start().get(), len);
     storage[len] = 0;
     return str;
 }
 static inline void
 StringWriteBarrierPost(js::ThreadSafeContext *maybecx, JSString **strp)
 {
 }
 static inline void
 StringWriteBarrierPostRemove(js::ThreadSafeContext *maybecx, JSString **strp)
 {
 }
 } /* namespace js */
 MOZ_ALWAYS_INLINE bool
 JSString::validateLength(js::ThreadSafeContext *maybecx, size_t length)
 {
     if (MOZ_UNLIKELY(length > JSString::MAX_LENGTH)) {
         js_ReportAllocationOverflow(maybecx);
         return false;
     }
     return true;
 }
 MOZ_ALWAYS_INLINE void
 JSRope::init(js::ThreadSafeContext *cx, JSString *left, JSString *right, size_t length)
 {
     d.lengthAndFlags = buildLengthAndFlags(length, ROPE_FLAGS);
     d.u1.left = left;
     d.s.u2.right = right;
     js::StringWriteBarrierPost(cx, &d.u1.left);
     js::StringWriteBarrierPost(cx, &d.s.u2.right);
 }
 template <js::AllowGC allowGC>
 MOZ_ALWAYS_INLINE JSRope *
 JSRope::new_(js::ThreadSafeContext *cx,
              typename js::MaybeRooted<JSString*, allowGC>::HandleType left,
              typename js::MaybeRooted<JSString*, allowGC>::HandleType right,
              size_t length)
 {
     if (!validateLength(cx, length))
         return nullptr;
     JSRope *str = (JSRope *) js_NewGCString<allowGC>(cx);
     if (!str)
         return nullptr;
     str->init(cx, left, right, length);
     return str;
 }
 inline void
 JSRope::markChildren(JSTracer *trc)
 {
     js::gc::MarkStringUnbarriered(trc, &d.u1.left, "left child");
     js::gc::MarkStringUnbarriered(trc, &d.s.u2.right, "right child");
 }
 MOZ_ALWAYS_INLINE void
 JSDependentString::init(js::ThreadSafeContext *cx, JSLinearString *base, const jschar *chars,
                         size_t length)
 {
     JS_ASSERT(!js::IsPoisonedPtr(base));
     d.lengthAndFlags = buildLengthAndFlags(length, DEPENDENT_FLAGS);
     d.u1.chars = chars;
     d.s.u2.base = base;
     js::StringWriteBarrierPost(cx, reinterpret_cast<JSString **>(&d.s.u2.base));
 }
 MOZ_ALWAYS_INLINE JSLinearString *
 JSDependentString::new_(js::ExclusiveContext *cx,
                         JSLinearString *baseArg, const jschar *chars, size_t length)
 {
     /* Try to avoid long chains of dependent strings. */
     while (baseArg->isDependent())
         baseArg = baseArg->asDependent().base();
     JS_ASSERT(baseArg->isFlat());
     /*
      * The chars we are pointing into must be owned by something in the chain
      * of dependent or undepended strings kept alive by our base pointer.
      */
 #ifdef DEBUG
     for (JSLinearString *b = baseArg; ; b = b->base()) {
         if (chars >= b->chars() && chars < b->chars() + b->length() &&
             length <= b->length() - (chars - b->chars()))
         {
             break;
         }
     }
 #endif
     /*
      * Do not create a string dependent on inline chars from another string,
      * both to avoid the awkward moving-GC hazard this introduces and because it
      * is more efficient to immediately undepend here.
      */
     if (JSFatInlineString::lengthFits(length))
         return js::NewFatInlineString<js::CanGC>(cx, JS::TwoByteChars(chars, length));
     JSDependentString *str = (JSDependentString *)js_NewGCString<js::NoGC>(cx);
     if (str) {
         str->init(cx, baseArg, chars, length);
         return str;
     }
     JS::Rooted<JSLinearString*> base(cx, baseArg);
     str = (JSDependentString *)js_NewGCString<js::CanGC>(cx);
     if (!str)
         return nullptr;
     str->init(cx, base, chars, length);
     return str;
 }
 inline void
 JSString::markBase(JSTracer *trc)
 {
     JS_ASSERT(hasBase());
     js::gc::MarkStringUnbarriered(trc, &d.s.u2.base, "base");
 }
 MOZ_ALWAYS_INLINE void
 JSFlatString::init(const jschar *chars, size_t length)
 {
     d.lengthAndFlags = buildLengthAndFlags(length, FIXED_FLAGS);
     d.u1.chars = chars;
 }
 template <js::AllowGC allowGC>
 MOZ_ALWAYS_INLINE JSFlatString *
 JSFlatString::new_(js::ThreadSafeContext *cx, const jschar *chars, size_t length)
 {
     JS_ASSERT(chars[length] == jschar(0));
     if (!validateLength(cx, length))
         return nullptr;
     JSFlatString *str = (JSFlatString *)js_NewGCString<allowGC>(cx);
     if (!str)
         return nullptr;
     str->init(chars, length);
     return str;
 }
 inline js::PropertyName *
 JSFlatString::toPropertyName(JSContext *cx)
 {
 #ifdef DEBUG
     uint32_t dummy;
     JS_ASSERT(!isIndex(&dummy));
 #endif
     if (isAtom())
         return asAtom().asPropertyName();
     JSAtom *atom = js::AtomizeString(cx, this);
     if (!atom)
         return nullptr;
     return atom->asPropertyName();
 }
 template <js::AllowGC allowGC>
 MOZ_ALWAYS_INLINE JSInlineString *
 JSInlineString::new_(js::ThreadSafeContext *cx)
 {
     return (JSInlineString *)js_NewGCString<allowGC>(cx);
 }
 MOZ_ALWAYS_INLINE jschar *
 JSInlineString::init(size_t length)
 {
     d.lengthAndFlags = buildLengthAndFlags(length, FIXED_FLAGS);
     d.u1.chars = d.inlineStorage;
     JS_ASSERT(lengthFits(length) || (isFatInline() && JSFatInlineString::lengthFits(length)));
     return d.inlineStorage;
 }
 MOZ_ALWAYS_INLINE void
 JSInlineString::resetLength(size_t length)
 {
     d.lengthAndFlags = buildLengthAndFlags(length, FIXED_FLAGS);
     JS_ASSERT(lengthFits(length) || (isFatInline() && JSFatInlineString::lengthFits(length)));
 }
 template <js::AllowGC allowGC>
 MOZ_ALWAYS_INLINE JSFatInlineString *
 JSFatInlineString::new_(js::ThreadSafeContext *cx)
 {
     return js_NewGCFatInlineString<allowGC>(cx);
 }
 MOZ_ALWAYS_INLINE void
 JSExternalString::init(const jschar *chars, size_t length, const JSStringFinalizer *fin)
 {
     JS_ASSERT(fin);
     JS_ASSERT(fin->finalize);
     d.lengthAndFlags = buildLengthAndFlags(length, FIXED_FLAGS);
     d.u1.chars = chars;
     d.s.u2.externalFinalizer = fin;
 }
 MOZ_ALWAYS_INLINE JSExternalString *
 JSExternalString::new_(JSContext *cx, const jschar *chars, size_t length,
                        const JSStringFinalizer *fin)
 {
     JS_ASSERT(chars[length] == 0);
     if (!validateLength(cx, length))
         return nullptr;
     JSExternalString *str = js_NewGCExternalString(cx);
     if (!str)
         return nullptr;
     str->init(chars, length, fin);
     cx->runtime()->updateMallocCounter(cx->zone(), (length + 1) * sizeof(jschar));
     return str;
 }
 inline JSLinearString *
 js::StaticStrings::getUnitStringForElement(JSContext *cx, JSString *str, size_t index)
 {
     JS_ASSERT(index < str->length());
     jschar c;
     if (!str->getChar(cx, index, &c))
         return nullptr;
     if (c < UNIT_STATIC_LIMIT)
         return getUnit(c);
     return js_NewDependentString(cx, str, index, 1);
 }
 inline JSAtom *
 js::StaticStrings::getLength2(jschar c1, jschar c2)
 {
     JS_ASSERT(fitsInSmallChar(c1));
     JS_ASSERT(fitsInSmallChar(c2));
     size_t index = (((size_t)toSmallChar[c1]) << 6) + toSmallChar[c2];
     return length2StaticTable[index];
 }
 MOZ_ALWAYS_INLINE void
 JSString::finalize(js::FreeOp *fop)
 {
     /* FatInline strings are in a different arena. */
     JS_ASSERT(getAllocKind() != js::gc::FINALIZE_FAT_INLINE_STRING);
     if (isFlat())
         asFlat().finalize(fop);
     else
         JS_ASSERT(isDependent() || isRope());
 }
 inline void
 JSFlatString::finalize(js::FreeOp *fop)
 {
     JS_ASSERT(getAllocKind() != js::gc::FINALIZE_FAT_INLINE_STRING);
     if (chars() != d.inlineStorage)
         fop->free_(const_cast<jschar *>(chars()));
 }
 inline void
 JSFatInlineString::finalize(js::FreeOp *fop)
 {
     JS_ASSERT(getAllocKind() == js::gc::FINALIZE_FAT_INLINE_STRING);
     if (chars() != d.inlineStorage)
         fop->free_(const_cast<jschar *>(chars()));
 }
 inline void
 JSAtom::finalize(js::FreeOp *fop)
 {
     JS_ASSERT(JSString::isAtom());
     JS_ASSERT(JSString::isFlat());
     if (chars() != d.inlineStorage)
         fop->free_(const_cast<jschar *>(chars()));
 }
 inline void
 JSExternalString::finalize(js::FreeOp *fop)
 {
     const JSStringFinalizer *fin = externalFinalizer();
     fin->finalize(fin, const_cast<jschar *>(chars()));
 }
 #endif /* vm_String_inl_h */

The Tor Browser / annotate

js/src/vm/String-inl.h@6474c204b198 (annotated)

js/src/vm/String-inl.h