#include "JSGlobalObject.h"
#include "JSGlobalObjectFunctions.h"
#include "JSObject.h"
-#include "Operations.h"
+#include "JSCInlines.h"
#include "StringObject.h"
#include "StringPrototype.h"
+#include "StrongInlines.h"
namespace JSC {
-static const unsigned substringFromRopeCutoff = 4;
-
const ClassInfo JSString::s_info = { "string", 0, 0, 0, CREATE_METHOD_TABLE(JSString) };
void JSRopeString::RopeBuilder::expand()
{
ASSERT(m_index == JSRopeString::s_maxInternalRopeLength);
JSString* jsString = m_jsString;
- m_jsString = jsStringBuilder(&m_globalData);
+ RELEASE_ASSERT(jsString);
+ m_jsString = jsStringBuilder(&m_vm);
m_index = 0;
append(jsString);
}
void JSString::destroy(JSCell* cell)
{
- JSString* thisObject = jsCast<JSString*>(cell);
+ JSString* thisObject = static_cast<JSString*>(cell);
thisObject->JSString::~JSString();
}
+void JSString::dumpToStream(const JSCell* cell, PrintStream& out)
+{
+ const JSString* thisObject = jsCast<const JSString*>(cell);
+ out.printf("<%p, %s, [%u], ", thisObject, thisObject->className(), thisObject->length());
+ if (thisObject->isRope())
+ out.printf("[rope]");
+ else {
+ WTF::StringImpl* ourImpl = thisObject->m_value.impl();
+ if (ourImpl->is8Bit())
+ out.printf("[8 %p]", ourImpl->characters8());
+ else
+ out.printf("[16 %p]", ourImpl->characters16());
+ }
+ out.printf(">");
+}
+
void JSString::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
JSString* thisObject = jsCast<JSString*>(cell);
if (thisObject->isRope())
static_cast<JSRopeString*>(thisObject)->visitFibers(visitor);
+ else {
+ StringImpl* impl = thisObject->m_value.impl();
+ ASSERT(impl);
+ visitor.reportExtraMemoryUsage(thisObject, impl->costDuringGC());
+ }
}
void JSRopeString::visitFibers(SlotVisitor& visitor)
visitor.append(&m_fibers[i]);
}
+static const unsigned maxLengthForOnStackResolve = 2048;
+
+void JSRopeString::resolveRopeInternal8(LChar* buffer) const
+{
+ for (size_t i = 0; i < s_maxInternalRopeLength && m_fibers[i]; ++i) {
+ if (m_fibers[i]->isRope()) {
+ resolveRopeSlowCase8(buffer);
+ return;
+ }
+ }
+
+ LChar* position = buffer;
+ for (size_t i = 0; i < s_maxInternalRopeLength && m_fibers[i]; ++i) {
+ const StringImpl& fiberString = *m_fibers[i]->m_value.impl();
+ unsigned length = fiberString.length();
+ StringImpl::copyChars(position, fiberString.characters8(), length);
+ position += length;
+ }
+ ASSERT((buffer + m_length) == position);
+}
+
+void JSRopeString::resolveRopeInternal16(UChar* buffer) const
+{
+ for (size_t i = 0; i < s_maxInternalRopeLength && m_fibers[i]; ++i) {
+ if (m_fibers[i]->isRope()) {
+ resolveRopeSlowCase(buffer);
+ return;
+ }
+ }
+
+ UChar* position = buffer;
+ for (size_t i = 0; i < s_maxInternalRopeLength && m_fibers[i]; ++i) {
+ const StringImpl& fiberString = *m_fibers[i]->m_value.impl();
+ unsigned length = fiberString.length();
+ if (fiberString.is8Bit())
+ StringImpl::copyChars(position, fiberString.characters8(), length);
+ else
+ StringImpl::copyChars(position, fiberString.characters16(), length);
+ position += length;
+ }
+ ASSERT((buffer + m_length) == position);
+}
+
+void JSRopeString::resolveRopeToAtomicString(ExecState* exec) const
+{
+ if (m_length > maxLengthForOnStackResolve) {
+ resolveRope(exec);
+ m_value = AtomicString(m_value);
+ return;
+ }
+
+ if (is8Bit()) {
+ LChar buffer[maxLengthForOnStackResolve];
+ resolveRopeInternal8(buffer);
+ m_value = AtomicString(buffer, m_length);
+ } else {
+ UChar buffer[maxLengthForOnStackResolve];
+ resolveRopeInternal16(buffer);
+ m_value = AtomicString(buffer, m_length);
+ }
+
+ clearFibers();
+
+ // If we resolved a string that didn't previously exist, notify the heap that we've grown.
+ if (m_value.impl()->hasOneRef())
+ Heap::heap(this)->reportExtraMemoryCost(m_value.impl()->cost());
+}
+
+void JSRopeString::clearFibers() const
+{
+ for (size_t i = 0; i < s_maxInternalRopeLength && m_fibers[i]; ++i)
+ m_fibers[i].clear();
+}
+
+AtomicStringImpl* JSRopeString::resolveRopeToExistingAtomicString(ExecState* exec) const
+{
+ if (m_length > maxLengthForOnStackResolve) {
+ resolveRope(exec);
+ if (AtomicStringImpl* existingAtomicString = AtomicString::find(m_value.impl())) {
+ m_value = *existingAtomicString;
+ clearFibers();
+ return existingAtomicString;
+ }
+ return nullptr;
+ }
+
+ if (is8Bit()) {
+ LChar buffer[maxLengthForOnStackResolve];
+ resolveRopeInternal8(buffer);
+ if (AtomicStringImpl* existingAtomicString = AtomicString::find(buffer, m_length)) {
+ m_value = *existingAtomicString;
+ clearFibers();
+ return existingAtomicString;
+ }
+ } else {
+ UChar buffer[maxLengthForOnStackResolve];
+ resolveRopeInternal16(buffer);
+ if (AtomicStringImpl* existingAtomicString = AtomicString::find(buffer, m_length)) {
+ m_value = *existingAtomicString;
+ clearFibers();
+ return existingAtomicString;
+ }
+ }
+
+ return nullptr;
+}
+
void JSRopeString::resolveRope(ExecState* exec) const
{
ASSERT(isRope());
outOfMemory(exec);
return;
}
-
- for (size_t i = 0; i < s_maxInternalRopeLength && m_fibers[i]; ++i) {
- if (m_fibers[i]->isRope())
- return resolveRopeSlowCase8(buffer);
- }
-
- LChar* position = buffer;
- for (size_t i = 0; i < s_maxInternalRopeLength && m_fibers[i]; ++i) {
- StringImpl* string = m_fibers[i]->m_value.impl();
- unsigned length = string->length();
- StringImpl::copyChars(position, string->characters8(), length);
- position += length;
- m_fibers[i].clear();
- }
- ASSERT((buffer + m_length) == position);
+ resolveRopeInternal8(buffer);
+ clearFibers();
ASSERT(!isRope());
-
return;
}
return;
}
- for (size_t i = 0; i < s_maxInternalRopeLength && m_fibers[i]; ++i) {
- if (m_fibers[i]->isRope())
- return resolveRopeSlowCase(buffer);
- }
-
- UChar* position = buffer;
- for (size_t i = 0; i < s_maxInternalRopeLength && m_fibers[i]; ++i) {
- StringImpl* string = m_fibers[i]->m_value.impl();
- unsigned length = string->length();
- StringImpl::copyChars(position, string->characters(), length);
- position += length;
- m_fibers[i].clear();
- }
- ASSERT((buffer + m_length) == position);
+ resolveRopeInternal16(buffer);
+ clearFibers();
ASSERT(!isRope());
}
// Overview: These functions convert a JSString from holding a string in rope form
-// down to a simple UString representation. It does so by building up the string
+// down to a simple String representation. It does so by building up the string
// backwards, since we want to avoid recursion, we expect that the tree structure
// representing the rope is likely imbalanced with more nodes down the left side
// (since appending to the string is likely more common) - and as such resolving
void JSRopeString::resolveRopeSlowCase8(LChar* buffer) const
{
LChar* position = buffer + m_length; // We will be working backwards over the rope.
- Vector<JSString*, 32> workQueue; // Putting strings into a Vector is only OK because there are no GC points in this method.
+ Vector<JSString*, 32, UnsafeVectorOverflow> workQueue; // Putting strings into a Vector is only OK because there are no GC points in this method.
- for (size_t i = 0; i < s_maxInternalRopeLength && m_fibers[i]; ++i) {
+ for (size_t i = 0; i < s_maxInternalRopeLength && m_fibers[i]; ++i)
workQueue.append(m_fibers[i].get());
- // Clearing here works only because there are no GC points in this method.
- m_fibers[i].clear();
- }
while (!workQueue.isEmpty()) {
JSString* currentFiber = workQueue.last();
}
ASSERT(buffer == position);
- ASSERT(!isRope());
}
void JSRopeString::resolveRopeSlowCase(UChar* buffer) const
{
UChar* position = buffer + m_length; // We will be working backwards over the rope.
- Vector<JSString*, 32> workQueue; // These strings are kept alive by the parent rope, so using a Vector is OK.
+ Vector<JSString*, 32, UnsafeVectorOverflow> workQueue; // These strings are kept alive by the parent rope, so using a Vector is OK.
for (size_t i = 0; i < s_maxInternalRopeLength && m_fibers[i]; ++i)
workQueue.append(m_fibers[i].get());
StringImpl* string = static_cast<StringImpl*>(currentFiber->m_value.impl());
unsigned length = string->length();
position -= length;
- StringImpl::copyChars(position, string->characters(), length);
+ if (string->is8Bit())
+ StringImpl::copyChars(position, string->characters8(), length);
+ else
+ StringImpl::copyChars(position, string->characters16(), length);
}
ASSERT(buffer == position);
- ASSERT(!isRope());
}
void JSRopeString::outOfMemory(ExecState* exec) const
{
- for (size_t i = 0; i < s_maxInternalRopeLength && m_fibers[i]; ++i)
- m_fibers[i].clear();
+ clearFibers();
ASSERT(isRope());
- ASSERT(m_value == UString());
+ ASSERT(m_value.isNull());
if (exec)
throwOutOfMemoryError(exec);
}
resolveRope(exec);
// Return a safe no-value result, this should never be used, since the excetion will be thrown.
if (exec->exception())
- return jsString(exec, "");
+ return jsEmptyString(exec);
ASSERT(!isRope());
- ASSERT(i < m_value.length());
+ RELEASE_ASSERT(i < m_value.length());
return jsSingleCharacterSubstring(exec, m_value, i);
}
return false;
}
-bool JSString::toBoolean(ExecState*) const
+bool JSString::toBoolean() const
{
return m_length;
}
return jsToNumber(value(exec));
}
-inline StringObject* StringObject::create(ExecState* exec, JSGlobalObject* globalObject, JSString* string)
+inline StringObject* StringObject::create(VM& vm, JSGlobalObject* globalObject, JSString* string)
{
- StringObject* object = new (NotNull, allocateCell<StringObject>(*exec->heap())) StringObject(exec->globalData(), globalObject->stringObjectStructure());
- object->finishCreation(exec->globalData(), string);
+ StringObject* object = new (NotNull, allocateCell<StringObject>(vm.heap)) StringObject(vm, globalObject->stringObjectStructure());
+ object->finishCreation(vm, string);
return object;
}
JSObject* JSString::toObject(ExecState* exec, JSGlobalObject* globalObject) const
{
- return StringObject::create(exec, globalObject, const_cast<JSString*>(this));
+ return StringObject::create(exec->vm(), globalObject, const_cast<JSString*>(this));
}
-JSObject* JSString::toThisObject(JSCell* cell, ExecState* exec)
+JSValue JSString::toThis(JSCell* cell, ExecState* exec, ECMAMode ecmaMode)
{
- return StringObject::create(exec, exec->lexicalGlobalObject(), jsCast<JSString*>(cell));
+ if (ecmaMode == StrictMode)
+ return cell;
+ return StringObject::create(exec->vm(), exec->lexicalGlobalObject(), jsCast<JSString*>(cell));
}
-bool JSString::getOwnPropertySlot(JSCell* cell, ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
-{
- JSString* thisObject = jsCast<JSString*>(cell);
- // The semantics here are really getPropertySlot, not getOwnPropertySlot.
- // This function should only be called by JSValue::get.
- if (thisObject->getStringPropertySlot(exec, propertyName, slot))
- return true;
- slot.setBase(thisObject);
- JSObject* object;
- for (JSValue prototype = exec->lexicalGlobalObject()->stringPrototype(); !prototype.isNull(); prototype = object->prototype()) {
- object = asObject(prototype);
- if (object->methodTable()->getOwnPropertySlot(object, exec, propertyName, slot))
- return true;
- }
- slot.setUndefined();
- return true;
-}
-
-bool JSString::getStringPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
+bool JSString::getStringPropertyDescriptor(ExecState* exec, PropertyName propertyName, PropertyDescriptor& descriptor)
{
if (propertyName == exec->propertyNames().length) {
descriptor.setDescriptor(jsNumber(m_length), DontEnum | DontDelete | ReadOnly);
return true;
}
- bool isStrictUInt32;
- unsigned i = propertyName.toUInt32(isStrictUInt32);
- if (isStrictUInt32 && i < m_length) {
+ unsigned i = propertyName.asIndex();
+ if (i < m_length) {
+ ASSERT(i != PropertyName::NotAnIndex); // No need for an explicit check, the above test would always fail!
descriptor.setDescriptor(getIndex(exec, i), DontDelete | ReadOnly);
return true;
}
return false;
}
-bool JSString::getOwnPropertySlotByIndex(JSCell* cell, ExecState* exec, unsigned propertyName, PropertySlot& slot)
+JSString* jsStringWithCacheSlowCase(VM& vm, StringImpl& stringImpl)
{
- JSString* thisObject = jsCast<JSString*>(cell);
- // The semantics here are really getPropertySlot, not getOwnPropertySlot.
- // This function should only be called by JSValue::get.
- if (thisObject->getStringPropertySlot(exec, propertyName, slot))
- return true;
- return JSString::getOwnPropertySlot(thisObject, exec, Identifier::from(exec, propertyName), slot);
+ auto addResult = vm.stringCache.add(&stringImpl, nullptr);
+ if (addResult.isNewEntry)
+ addResult.iterator->value = jsString(&vm, String(stringImpl));
+ vm.lastCachedString.set(vm, addResult.iterator->value.get());
+ return addResult.iterator->value.get();
}
} // namespace JSC
projects / apple / javascriptcore.git / blobdiff