void SignalThread::print_backtraces() {
STATE = shared_.env()->state;
ThreadList* threads = shared_.thread_nexus()->threads();
for(ThreadList::iterator i = threads->begin(); i != threads->end(); ++i) {
VM* vm = (*i)->as_vm();
if(!vm) continue;
bool first = true;
CallFrame* frame = vm->call_frame();
while(frame) {
if(first) {
logger::fatal("--- %s %d backtrace ---", vm->kind_name(), vm->thread_id());
first = false;
}
std::ostringstream stream;
if(NativeMethodFrame* nmf = frame->native_method_frame()) {
stream << static_cast<void*>(frame) << ": ";
NativeMethod* nm = try_as<NativeMethod>(nmf->get_object(nmf->method()));
if(nm && nm->name()->symbol_p()) {
stream << "capi:" << nm->name()->debug_str(state) << " at ";
stream << nm->file()->c_str(state);
} else {
stream << "unknown capi";
}
} else if(frame->compiled_code) {
if(frame->is_block_p(state)) {
stream << "__block__";
} else {
if(SingletonClass* sc = try_as<SingletonClass>(frame->module())) {
Object* obj = sc->singleton();
if(Module* mod = try_as<Module>(obj)) {
stream << mod->debug_str(state) << ".";
} else {
if(obj == G(main)) {
stream << "MAIN.";
} else {
stream << "#<" << obj->class_object(state)->debug_str(state) <<
":" << (void*)obj->id(state)->to_native() << ">.";
}
}
} else if(IncludedModule* im = try_as<IncludedModule>(frame->module())) {
stream << im->module()->debug_str(state) << "#";
} else {
Symbol* name;
std::string mod_name;
if(frame->module()->nil_p()) {
mod_name = frame->lexical_scope()->module()->debug_str(state);
} else {
if((name = try_as<Symbol>(frame->module()->module_name()))) {
mod_name = name->debug_str(state);
} else if((name = try_as<Symbol>(
frame->lexical_scope()->module()->module_name()))) {
mod_name = name->debug_str(state);
} else {
mod_name = "<anonymous module>";
}
}
stream << mod_name << "#";
}
Symbol* name = try_as<Symbol>(frame->name());
if(name) {
stream << name->debug_str(state);
} else {
stream << frame->compiled_code->name()->debug_str(state);
}
}
stream << " in ";
if(Symbol* file_sym = try_as<Symbol>(frame->compiled_code->file())) {
stream << file_sym->debug_str(state) << ":" << frame->line(state);
} else {
stream << "<unknown>";
}
stream << " (+" << frame->ip();
if(frame->is_inline_frame()) {
stream << " inline";
} else if(frame->jitted_p()) {
stream << " jit";
}
stream << ")";
}
logger::fatal(stream.str().c_str());
frame = frame->previous;
}
}
}
Object* const_get(STATE, Symbol* name, ConstantMissingReason* reason, Object* filter, bool replace_autoload) {
LexicalScope *cur;
Object* result;
*reason = vNonExistent;
CallFrame* frame = state->vm()->get_ruby_frame();
// Ok, this has to be explained or it will be considered black magic.
// The scope chain always ends with an entry at the top that contains
// a parent of nil, and a module of Object. This entry is put in
// regardless of lexical scoping, it's the fallback scope (the default
// scope). This is not case when deriving from BasicObject, which is
// explained later.
//
// When looking up a constant, we don't want to consider the fallback
// scope (ie, Object) initially because we need to lookup up
// the superclass chain first, because falling back on the default.
//
// The rub comes from the fact that if a user explicitly opens up
// Object in their code, we DO consider it. Like:
//
// class Idiot
// A = 2
// end
//
// class ::Object
// A = 1
// class Stupid < Idiot
// def foo
// p A
// end
// end
// end
//
// In this code, when A is looked up, Object must be considering during
// the scope walk, NOT during the superclass walk.
//
// So, in this case, foo would print "1", not "2".
//
// As indicated above, the fallback scope isn't used when the superclass
// chain directly rooted from BasicObject. To determine this is the
// case, we record whether Object is seen when looking up the superclass
// chain. If Object isn't seen, this means we are directly deriving from
// BasicObject.
cur = frame->lexical_scope();
while(!cur->nil_p()) {
// Detect the toplevel scope (the default) and get outta dodge.
if(cur->top_level_p(state)) break;
result = cur->module()->get_const(state, name, G(sym_private), reason, false, replace_autoload);
if(*reason == vFound) {
if(result != filter) return result;
*reason = vNonExistent;
}
cur = cur->parent();
}
// Now look up the superclass chain.
Module *fallback = G(object);
cur = frame->lexical_scope();
if(!cur->nil_p()) {
bool object_seen = false;
Module* mod = cur->module();
while(!mod->nil_p()) {
if(mod == G(object)) {
object_seen = true;
}
if(!object_seen && mod == G(basicobject)) {
fallback = NULL;
}
result = mod->get_const(state, name, G(sym_private), reason, false, replace_autoload);
if(*reason == vFound) {
if(result != filter) return result;
*reason = vNonExistent;
}
mod = mod->superclass();
}
}
// Lastly, check the fallback scope (=Object) specifically if needed
if(fallback) {
result = fallback->get_const(state, name, G(sym_private), reason, true, replace_autoload);
if(*reason == vFound) {
if(result != filter) return result;
*reason = vNonExistent;
}
}
return cNil;
}