Variant f_constant(CStrRef name) {
if (!name.get()) return null;
const char *data = name.data();
int len = name.length();
char *colon;
if ((colon = (char*)memchr(data, ':', len)) && colon[1] == ':') {
// class constant
int classNameLen = colon - data;
char *constantName = colon + 2;
String className(data, classNameLen, CopyString);
// translate "self" or "parent"
if (className == "self") {
String this_class = hhvm
? g_vmContext->getContextClassName()
: FrameInjection::GetClassName(true);
if (this_class.empty()) {
throw FatalErrorException("Cannot access self:: "
"when no class scope is active");
} else {
className = this_class;
}
} else if (className == "parent") {
String parent_class = hhvm
? g_vmContext->getParentContextClassName()
: FrameInjection::GetParentClassName(true);
if (parent_class.empty()) {
throw FatalErrorException("Cannot access parent");
} else {
className = parent_class;
}
}
// taking care of volatile class
if (class_exists(className)) {
return get_class_constant(className, constantName, false);
} else {
return null;
}
} else {
if (hhvm) {
TypedValue* cns = g_vmContext->getCns(name.get());
if (cns == NULL) {
if (AutoloadHandler::s_instance->autoloadConstant(name)) {
cns = g_vmContext->getCns(name.get());
}
}
if (cns) return tvAsVariant(cns);
return null;
} else {
const ClassInfo::ConstantInfo *cinfo = ClassInfo::FindConstant(name);
// system/uniquely defined scalar constant (must be valid)
if (cinfo) return cinfo->getValue();
if (!((Globals*)get_global_variables())->defined(name)) {
AutoloadHandler::s_instance->autoloadConstant(name);
}
// dynamic/redeclared constant
return ((Globals*)get_global_variables())->getConstant(name.data());
}
}
}
bool f_defined(CStrRef name, bool autoload /* = true */) {
if (!name.get()) return false;
const char *data = name.data();
int len = name.length();
char *colon;
if ((colon = (char*)memchr(data, ':', len)) && colon[1] == ':') {
// class constant
int classNameLen = colon - data;
char *constantName = colon + 2;
String className(data, classNameLen, CopyString);
// translate "self" or "parent"
if (className == "self") {
String this_class = g_vmContext->getContextClassName();
if (this_class.empty()) {
throw FatalErrorException("Cannot access self:: "
"when no class scope is active");
} else {
className = this_class;
}
} else if (className == "parent") {
String parent_class = g_vmContext->getParentContextClassName();
if (parent_class.empty()) {
throw FatalErrorException("Cannot access parent");
} else {
className = parent_class;
}
}
if (class_exists(className)) { // taking care of volatile class
const ClassInfo *info;
for (String parentClass = className;
!parentClass.empty();
parentClass = info->getParentClass()) {
info = ClassInfo::FindClass(parentClass);
if (!info) {
assert(false);
}
if (info->hasConstant(constantName)) return true;
}
return false;
} else {
return false;
}
} else {
// system/uniquely defined scalar constant
if (ClassInfo::FindConstant(name)) return true;
if (g_vmContext->defined(name)) {
return true;
}
if (!autoload || !AutoloadHandler::s_instance->autoloadConstant(name)) {
return false;
}
return g_vmContext->defined(name);
}
}
