VariableScope* VariableScope::synthesize(STATE, CompiledMethod* method,
Module* module, Object* parent,
Object* self, Object* block,
Tuple* locals)
{
VariableScope* scope = state->new_object<VariableScope>(G(variable_scope));
scope->block(state, block);
scope->module(state, module);
scope->method(state, method);
if(VariableScope* vs = try_as<VariableScope>(parent)) {
scope->parent(state, vs);
} else {
scope->parent(state, nil<VariableScope>());
}
scope->heap_locals(state, locals);
scope->last_match(state, cNil);
scope->self(state, self);
scope->number_of_locals_ = locals->num_fields();
scope->isolated_ = true;
scope->locals_ = 0;
scope->block_as_method_ = 0;
return scope;
}
VariableScope* StackVariables::create_heap_alias(STATE, CallFrame* call_frame,
bool full)
{
if(on_heap_) return on_heap_;
MachineCode* mcode = call_frame->compiled_code->machine_code();
VariableScope* scope =
state->memory()->new_object<VariableScope>(state, G(variable_scope));
if(parent_) {
scope->parent(state, parent_);
} else {
scope->parent(state, nil<VariableScope>());
}
scope->self(state, self_);
scope->block(state, block_);
scope->module(state, module_);
scope->method(state, call_frame->compiled_code);
scope->heap_locals(state, nil<Tuple>());
scope->last_match(state, last_match_);
scope->fiber(state, state->vm()->thread()->current_fiber());
scope->number_of_locals(mcode->number_of_locals);
scope->isolated(0);
scope->flags(call_frame->flags);
scope->_lock_.init();
if(!full) {
scope->isolated(1);
scope->heap_locals(state, Tuple::create(state, mcode->number_of_locals));
for(int i = 0; i < scope->number_of_locals(); i++) {
scope->set_local(state, i, locals_[i]);
}
}
scope->locals(locals_);
scope->dynamic_locals(state, nil<LookupTable>());
on_heap_ = scope;
return scope;
}
Object* StackVariables::last_match(STATE) {
// For closures, get back to the top of the chain and get that
// last_match.
if(parent_) {
VariableScope* scope = parent_;
while(RTEST(scope->parent())) {
scope = scope->parent();
}
return scope->last_match();
}
// Otherwise, if this has a heap alias, get the last_match from there.
if(on_heap_) {
return on_heap_->last_match();
// Lastly, use the local one. This is where a last_match begins life.
} else {
return last_match_;
}
}
VariableScope* StackVariables::create_heap_alias(STATE, CallFrame* call_frame,
bool full)
{
if(on_heap_) return on_heap_;
MachineCode* mcode = call_frame->compiled_code->machine_code();
VariableScope* scope = state->new_object_dirty<VariableScope>(G(variable_scope));
if(parent_) {
scope->parent(state, parent_);
} else {
scope->parent(state, nil<VariableScope>());
}
scope->self(state, self_);
scope->block(state, block_);
scope->module(state, module_);
scope->method(state, call_frame->compiled_code);
scope->heap_locals(state, Tuple::create(state, mcode->number_of_locals));
scope->last_match(state, last_match_);
scope->fiber(state, state->vm()->current_fiber.get());
scope->number_of_locals_ = mcode->number_of_locals;
if(full) {
scope->isolated_ = false;
} else {
scope->isolated_ = true;
}
scope->locals_ = locals_;
scope->dynamic_locals(state, nil<LookupTable>());
scope->set_block_as_method(call_frame->block_as_method_p());
on_heap_ = scope;
return scope;
}
VariableScope* StackVariables::create_heap_alias(STATE, CallFrame* call_frame,
bool full)
{
if(on_heap_) return on_heap_;
VMMethod* vmm = call_frame->cm->backend_method();
VariableScope* scope = state->new_object<VariableScope>(G(variable_scope));
if(parent_) {
scope->parent(state, parent_);
} else {
scope->parent(state, nil<VariableScope>());
}
scope->self(state, self_);
scope->block(state, block_);
scope->module(state, module_);
scope->method(state, call_frame->cm);
scope->heap_locals(state, Tuple::create(state, vmm->number_of_locals));
scope->last_match(state, last_match_);
scope->number_of_locals_ = vmm->number_of_locals;
if(full) {
scope->isolated_ = false;
} else {
scope->isolated_ = true;
}
scope->locals_ = locals_;
scope->set_block_as_method(call_frame->block_as_method_p());
on_heap_ = scope;
return scope;
}
void StackVariables::set_last_match(STATE, Object* obj) {
// For closures, get back to the top of the chain and set the
// last_match there. This means that the last_match is shared
// amongst all closures in a method, but thats how it's implemented
// in ruby.
if(parent_) {
VariableScope* scope = parent_;
while(RTEST(scope->parent())) {
scope = scope->parent();
}
return scope->last_match(state, obj);
}
// Use a heap alias if there is one.
if(on_heap_) {
on_heap_->last_match(state, obj);
// Otherwise, use the local one. This is where a last_match usually
// first appears.
} else {
last_match_ = obj;
}
}