const Func*
StaticMethodCache::lookup(RDS::Handle handle, const NamedEntity *ne,
const StringData* clsName,
const StringData* methName) {
StaticMethodCache* thiz = static_cast<StaticMethodCache*>
(handleToPtr(handle));
Stats::inc(Stats::TgtCache_StaticMethodMiss);
Stats::inc(Stats::TgtCache_StaticMethodHit, -1);
TRACE(1, "miss %s :: %s caller %p\n",
clsName->data(), methName->data(), __builtin_return_address(0));
Transl::VMRegAnchor _; // needed for lookupClsMethod.
ActRec* ar = reinterpret_cast<ActRec*>(vmsp() - kNumActRecCells);
const Func* f;
VMExecutionContext* ec = g_vmContext;
const Class* cls = Unit::loadClass(ne, clsName);
if (UNLIKELY(!cls)) {
raise_error(Strings::UNKNOWN_CLASS, clsName->data());
}
LookupResult res = ec->lookupClsMethod(f, cls, methName,
nullptr, // there may be an active this,
// but we can just fall through
// in that case.
arGetContextClass(ec->getFP()),
false /*raise*/);
if (LIKELY(res == LookupResult::MethodFoundNoThis &&
!f->isAbstract() &&
f->isStatic())) {
f->validate();
TRACE(1, "fill %s :: %s -> %p\n", clsName->data(),
methName->data(), f);
// Do the | here instead of on every call.
thiz->m_cls = (Class*)(uintptr_t(cls) | 1);
thiz->m_func = f;
ar->setClass(const_cast<Class*>(cls));
return f;
}
assert(res != LookupResult::MethodFoundWithThis); // Not possible: no this.
// We've already sync'ed regs; this is some hard case, we might as well
// just let the interpreter handle this entirely.
assert(toOp(*vmpc()) == OpFPushClsMethodD);
Stats::inc(Stats::Instr_InterpOneFPushClsMethodD);
Stats::inc(Stats::Instr_TC, -1);
ec->opFPushClsMethodD();
// Return whatever func the instruction produced; if nothing was
// possible we'll either have fataled or thrown.
assert(ar->m_func);
ar->m_func->validate();
// Don't update the cache; this case was too scary to memoize.
TRACE(1, "unfillable miss %s :: %s -> %p\n", clsName->data(),
methName->data(), ar->m_func);
// Indicate to the caller that there is no work to do.
return nullptr;
}
int DebuggerProxy::getRealStackDepth() {
TRACE(2, "DebuggerProxy::getRealStackDepth\n");
int depth = 0;
VMExecutionContext* context = g_vmContext;
ActRec *fp = context->getFP();
if (!fp) return 0;
while (fp != nullptr) {
fp = context->getPrevVMState(fp, nullptr, nullptr);
depth++;
}
return depth;
}
int DebuggerProxy::getStackDepth() {
TRACE(2, "DebuggerProxy::getStackDepth\n");
int depth = 0;
VMExecutionContext* context = g_vmContext;
ActRec *fp = context->getFP();
if (!fp) return 0;
ActRec *prev = fp->arGetSfp();
while (fp != prev) {
fp = prev;
prev = fp->arGetSfp();
depth++;
}
return depth;
}
const uchar* InstPointInfo::lookupPC() {
TRACE(2, "InstPointInfo::lookupPC\n");
VMExecutionContext* context = g_vmContext;
if (m_locType == LocHere) {
// Instrument to current location
ActRec *fp = context->getFP();
if (!fp) {
return nullptr;
}
PC pc = context->getPC();
HPHP::Unit *unit = fp->m_func->unit();
if (!unit) {
return nullptr;
}
m_file = unit->filepath()->data();
m_line = unit->getLineNumber(unit->offsetOf(pc));
return pc;
}
// TODO for file and line
return nullptr;
}
Class* Unit::defClass(PreClass* preClass,
bool failIsFatal /* = true */) {
Class* const* clsList = preClass->namedEntity()->clsList();
Class* top = *clsList;
if (top) {
Class *cls = top->getCached();
if (cls) {
// Raise a fatal unless the existing class definition is identical to the
// one this invocation would create.
if (cls->preClass() != preClass) {
if (failIsFatal) {
raise_error("Class already declared: %s", preClass->name()->data());
}
return NULL;
}
return cls;
}
}
// Get a compatible Class, and add it to the list of defined classes.
Class* parent = NULL;
for (;;) {
// Search for a compatible extant class. Searching from most to least
// recently created may have better locality than alternative search orders.
// In addition, its the only simple way to make this work lock free...
for (Class* class_ = top; class_ != NULL; class_ = class_->m_nextClass) {
if (class_->preClass() != preClass) continue;
Class::Avail avail = class_->avail(parent, failIsFatal /*tryAutoload*/);
if (LIKELY(avail == Class::AvailTrue)) {
class_->setCached();
DEBUGGER_ATTACHED_ONLY(phpDefClassHook(class_));
return class_;
}
if (avail == Class::AvailFail) {
if (failIsFatal) {
raise_error("unknown class %s", parent->name()->data());
}
return NULL;
}
ASSERT(avail == Class::AvailFalse);
}
// Create a new class.
if (!parent && preClass->parent()->size() != 0) {
parent = Unit::getClass(preClass->parent(), failIsFatal);
if (parent == NULL) {
if (failIsFatal) {
raise_error("unknown class %s", preClass->parent()->data());
}
return NULL;
}
}
VMExecutionContext* ec = g_vmContext;
ActRec* fp = ec->getFP();
PC pc = ec->getPC();
bool needsFrame = ec->m_stack.top() &&
(!fp || fp->m_func->unit() != preClass->unit());
if (needsFrame) {
/*
we can be called from Unit::merge, which hasnt yet setup
the frame (because often it doesnt need to).
Set up a fake frame here, in case of errors.
But note that mergeUnit is called for systemlib etc before the
stack has been setup. So dont do anything if m_stack.top()
is NULL
*/
ActRec &tmp = *ec->m_stack.allocA();
tmp.m_savedRbp = (uint64_t)fp;
tmp.m_savedRip = 0;
tmp.m_func = preClass->unit()->getMain();
tmp.m_soff = preClass->getOffset() - tmp.m_func->base();
tmp.setThis(NULL);
tmp.m_varEnv = 0;
tmp.initNumArgs(0);
ec->m_fp = &tmp;
ec->m_pc = preClass->unit()->at(preClass->getOffset());
ec->pushLocalsAndIterators(tmp.m_func);
}
ClassPtr newClass(Class::newClass(preClass, parent));
if (needsFrame) {
ec->m_stack.top() = (Cell*)(ec->m_fp+1);
ec->m_fp = fp;
ec->m_pc = pc;
}
Lock l(Unit::s_classesMutex);
/*
We could re-enter via Unit::getClass() or class_->avail(), so
no need for *clsList to be volatile
*/
if (UNLIKELY(top != *clsList)) {
top = *clsList;
continue;
}
if (top) {
newClass->m_cachedOffset = top->m_cachedOffset;
} else {
newClass->m_cachedOffset =
Transl::TargetCache::allocKnownClass(preClass->name());
}
newClass->m_nextClass = top;
Util::compiler_membar();
*const_cast<Class**>(clsList) = newClass.get();
newClass.get()->incAtomicCount();
newClass.get()->setCached();
DEBUGGER_ATTACHED_ONLY(phpDefClassHook(newClass.get()));
return newClass.get();
}
}