278 lines
10 KiB
Rust
278 lines
10 KiB
Rust
use prolog_parser::ast::*;
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use prolog::heap_print::*;
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use prolog::machine::*;
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use prolog::machine::compile::*;
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use prolog::machine::machine_errors::*;
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use prolog::num::ToPrimitive;
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use std::io::Read;
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impl Machine {
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pub(super)
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fn atom_tbl_of(&self, name: &ClauseName) -> TabledData<Atom> {
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match name {
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&ClauseName::User(ref rc) => rc.table.clone(),
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_ => self.indices.atom_tbl()
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}
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}
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fn compile_into_machine<R: Read>(&mut self, src: ParsingStream<R>, name: ClauseName, arity: usize)
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-> EvalSession
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{
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match name.owning_module().as_str() {
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"user" => match self.indices.code_dir.get(&(name.clone(), arity)).cloned() {
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Some(idx) => {
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let module = idx.0.borrow().1.clone();
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match module.as_str() {
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"user" => compile_user_module(self, src),
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_ => compile_into_module(self, module, src, name)
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}
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},
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None => compile_user_module(self, src)
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},
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_ => compile_into_module(self, name.owning_module(), src, name)
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}
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}
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fn get_predicate_key(&self, name: RegType, arity: RegType) -> PredicateKey
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{
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let name = self.machine_st[name].clone();
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let arity = self.machine_st[arity].clone();
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let name = match self.machine_st.store(self.machine_st.deref(name)) {
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Addr::Con(Constant::Atom(name, _)) => name,
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_ => unreachable!()
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};
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let arity = match self.machine_st.store(self.machine_st.deref(arity)) {
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Addr::Con(Constant::Number(Number::Integer(arity))) =>
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arity.to_usize().unwrap(),
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_ => unreachable!()
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};
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(name, arity)
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}
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fn print_new_dynamic_clause(&self, addrs: VecDeque<Addr>, name: ClauseName, arity: usize)
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-> String
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{
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let mut output = PrinterOutputter::new();
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output.append(format!(":- dynamic({}/{}). ", name.as_str(), arity).as_str());
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for addr in addrs {
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let mut printer = HCPrinter::new(&self.machine_st, output);
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printer.quoted = true;
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output = printer.print(addr);
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output.append(". ");
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}
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output.result()
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}
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fn abolish_dynamic_clause(&mut self, name: RegType, arity: RegType)
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{
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let (name, arity) = self.get_predicate_key(name, arity);
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if let Some(idx) = self.indices.code_dir.get(&(name.clone(), arity)) {
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set_code_index!(idx, IndexPtr::Undefined, clause_name!("user"));
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}
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self.indices.remove_code_index((name.clone(), arity));
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self.indices.remove_clause_subsection(name.owning_module(), name, arity);
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}
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fn abolish_dynamic_clause_in_module(&mut self, name: RegType, arity: RegType, module: RegType)
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{
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let (name, arity) = self.get_predicate_key(name, arity);
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let module_addr = self.machine_st[module].clone();
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let module_name = match self.machine_st.store(self.machine_st.deref(module_addr)) {
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Addr::Con(Constant::Atom(module, _)) =>
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match self.indices.modules.get_mut(&module) {
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Some(ref mut module) => {
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module.code_dir.remove(&(name.clone(), arity));
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module.module_decl.name.clone()
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},
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_ => {
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self.machine_st.fail = true;
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return;
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}
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},
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_ => unreachable!()
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};
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if let Some(idx) = self.indices.code_dir.get(&(name.clone(), arity)) {
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if idx.module_name() == module_name {
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set_code_index!(idx, IndexPtr::Undefined, clause_name!("user"));
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}
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}
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self.indices.remove_code_index((name.clone(), arity));
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self.indices.remove_clause_subsection(module_name, name, arity);
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}
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fn handle_eval_result_from_dynamic_compile(&mut self, pred_str: String, name: ClauseName,
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arity: usize, src: ClauseName)
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{
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let machine_st = mem::replace(&mut self.machine_st, MachineState::new());
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let result = self.compile_into_machine(parsing_stream(pred_str.as_bytes()), name, arity);
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self.machine_st = machine_st;
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if let EvalSession::Error(err) = result {
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let h = self.machine_st.heap.h;
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let stub = MachineError::functor_stub(src, 1);
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let err = MachineError::session_error(h, err);
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let err = self.machine_st.error_form(err, stub);
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self.machine_st.throw_exception(err);
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}
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}
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fn recompile_dynamic_predicate_impl(&mut self, place: DynamicAssertPlace, name: ClauseName,
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arity: usize)
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{
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let stub = MachineError::functor_stub(place.predicate_name(), 1);
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let pred_str = match self.machine_st.try_from_list(temp_v!(2), stub) {
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Ok(addrs) => {
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let mut addrs = VecDeque::from(addrs);
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let added_clause = self.machine_st[temp_v!(1)].clone();
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place.push_to_queue(&mut addrs, added_clause);
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self.print_new_dynamic_clause(addrs, name.clone(), arity)
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},
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Err(err) =>
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return self.machine_st.throw_exception(err)
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};
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self.handle_eval_result_from_dynamic_compile(pred_str, name, arity, place.predicate_name());
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}
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fn set_module_atom_tbl(&mut self, module_addr: Addr, name: &mut ClauseName) -> bool
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{
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let atom_tbl = match self.machine_st.store(self.machine_st.deref(module_addr)) {
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Addr::Con(Constant::Atom(module, _)) =>
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match self.indices.modules.get(&module) {
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Some(ref module) => module.atom_tbl.clone(),
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None => {
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self.machine_st.fail = true;
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return false;
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}
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},
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_ => unreachable!()
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};
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if let &mut ClauseName::User(ref mut rc) = name {
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rc.table = atom_tbl;
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}
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true
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}
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fn recompile_dynamic_predicate_in_module(&mut self, place: DynamicAssertPlace)
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{
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let (mut name, arity) = self.get_predicate_key(temp_v!(3), temp_v!(4));
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let module_addr = self.machine_st[temp_v!(5)].clone();
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if self.set_module_atom_tbl(module_addr, &mut name) {
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self.recompile_dynamic_predicate_impl(place, name, arity);
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}
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}
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fn recompile_dynamic_predicate(&mut self, place: DynamicAssertPlace)
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{
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let (name, arity) = self.get_predicate_key(temp_v!(3), temp_v!(4));
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self.recompile_dynamic_predicate_impl(place, name, arity);
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}
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fn retract_from_dynamic_predicate_in_module(&mut self)
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{
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let index = self.machine_st[temp_v!(3)].clone();
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let index = match self.machine_st.store(self.machine_st.deref(index)) {
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Addr::Con(Constant::Number(Number::Integer(n))) => n.to_usize().unwrap(),
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_ => unreachable!()
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};
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let (mut name, arity) = self.get_predicate_key(temp_v!(1), temp_v!(2));
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let module_addr = self.machine_st[temp_v!(5)].clone();
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if self.set_module_atom_tbl(module_addr, &mut name) {
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let stub = MachineError::functor_stub(clause_name!("retract"), 1);
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let pred_str = match self.machine_st.try_from_list(temp_v!(4), stub) {
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Ok(addrs) => {
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let mut addrs = VecDeque::from(addrs);
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addrs.remove(index);
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if addrs.is_empty() {
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self.abolish_dynamic_clause_in_module(temp_v!(1), temp_v!(2),
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temp_v!(5));
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return;
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}
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self.print_new_dynamic_clause(addrs, name.clone(), arity)
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},
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Err(err) =>
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return self.machine_st.throw_exception(err)
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};
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self.handle_eval_result_from_dynamic_compile(pred_str, name, arity,
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clause_name!("retract"));
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}
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}
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fn retract_from_dynamic_predicate(&mut self)
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{
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let index = self.machine_st[temp_v!(3)].clone();
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let index = match self.machine_st.store(self.machine_st.deref(index)) {
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Addr::Con(Constant::Number(Number::Integer(n))) => n.to_usize().unwrap(),
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_ => unreachable!()
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};
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let (name, arity) = self.get_predicate_key(temp_v!(1), temp_v!(2));
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let stub = MachineError::functor_stub(clause_name!("retract"), 1);
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let pred_str = match self.machine_st.try_from_list(temp_v!(4), stub) {
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Ok(addrs) => {
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let mut addrs = VecDeque::from(addrs);
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addrs.remove(index);
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if addrs.is_empty() {
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self.abolish_dynamic_clause(temp_v!(1), temp_v!(2));
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return;
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}
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self.print_new_dynamic_clause(addrs, name.clone(), arity)
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},
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Err(err) =>
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return self.machine_st.throw_exception(err)
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};
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self.handle_eval_result_from_dynamic_compile(pred_str, name, arity,
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clause_name!("retract"));
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}
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pub(super)
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fn dynamic_transaction(&mut self, trans_type: DynamicTransactionType, p: LocalCodePtr)
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{
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match trans_type {
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DynamicTransactionType::Abolish =>
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self.abolish_dynamic_clause(temp_v!(1), temp_v!(2)),
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DynamicTransactionType::Assert(place) =>
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self.recompile_dynamic_predicate(place),
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DynamicTransactionType::ModuleAbolish =>
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self.abolish_dynamic_clause_in_module(temp_v!(1), temp_v!(2), temp_v!(3)),
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DynamicTransactionType::ModuleAssert(place) =>
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self.recompile_dynamic_predicate_in_module(place),
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DynamicTransactionType::ModuleRetract =>
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self.retract_from_dynamic_predicate_in_module(),
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DynamicTransactionType::Retract =>
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self.retract_from_dynamic_predicate()
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}
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self.machine_st.p = CodePtr::Local(p);
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}
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}
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