848 lines
30 KiB
Rust
848 lines
30 KiB
Rust
use prolog_parser::ast::*;
|
|
use prolog_parser::tabled_rc::*;
|
|
|
|
use prolog::clause_types::*;
|
|
use prolog::fixtures::*;
|
|
use prolog::forms::*;
|
|
use prolog::heap_print::*;
|
|
use prolog::instructions::*;
|
|
use prolog::read::*;
|
|
use prolog::write::{ContinueResult, next_keypress};
|
|
|
|
pub mod machine_indices;
|
|
pub mod heap;
|
|
mod and_stack;
|
|
mod or_stack;
|
|
mod attributed_variables;
|
|
mod copier;
|
|
mod dynamic_database;
|
|
pub mod machine_errors;
|
|
pub mod toplevel;
|
|
pub mod compile;
|
|
pub(super) mod code_repo;
|
|
pub mod modules;
|
|
pub(super) mod machine_state;
|
|
pub(super) mod term_expansion;
|
|
|
|
#[macro_use] mod machine_state_impl;
|
|
mod system_calls;
|
|
|
|
use prolog::machine::attributed_variables::*;
|
|
use prolog::machine::compile::*;
|
|
use prolog::machine::code_repo::*;
|
|
use prolog::machine::machine_errors::*;
|
|
use prolog::machine::machine_indices::*;
|
|
use prolog::machine::machine_state::*;
|
|
use prolog::machine::modules::*;
|
|
use prolog::machine::toplevel::stream_to_toplevel;
|
|
use prolog::read::PrologStream;
|
|
|
|
use indexmap::IndexMap;
|
|
|
|
use std::collections::VecDeque;
|
|
use std::io::{Read, Write, stdout};
|
|
use std::fs::File;
|
|
use std::mem;
|
|
use std::ops::Index;
|
|
use std::rc::Rc;
|
|
|
|
use termion::raw::{IntoRawMode};
|
|
|
|
pub struct MachinePolicies {
|
|
call_policy: Box<CallPolicy>,
|
|
cut_policy: Box<CutPolicy>,
|
|
}
|
|
|
|
impl MachinePolicies {
|
|
#[inline]
|
|
fn new() -> Self {
|
|
MachinePolicies {
|
|
call_policy: Box::new(DefaultCallPolicy {}),
|
|
cut_policy: Box::new(DefaultCutPolicy {}),
|
|
}
|
|
}
|
|
}
|
|
|
|
pub struct Machine {
|
|
pub(super) machine_st: MachineState,
|
|
pub(super) policies: MachinePolicies,
|
|
pub(super) indices: IndexStore,
|
|
pub(super) code_repo: CodeRepo,
|
|
pub(super) toplevel_idx: usize,
|
|
pub(super) prolog_stream: ParsingStream<Box<Read>>
|
|
}
|
|
|
|
impl Index<LocalCodePtr> for CodeRepo {
|
|
type Output = Line;
|
|
|
|
fn index(&self, ptr: LocalCodePtr) -> &Self::Output {
|
|
match ptr {
|
|
LocalCodePtr::InSituDirEntry(p) => &self.in_situ_code[p],
|
|
LocalCodePtr::TopLevel(_, p) => &self.cached_query[p],
|
|
LocalCodePtr::DirEntry(p) => &self.code[p],
|
|
LocalCodePtr::UserGoalExpansion(p) => &self.goal_expanders[p],
|
|
LocalCodePtr::UserTermExpansion(p) => &self.term_expanders[p],
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Index<LocalCodePtr> for Machine {
|
|
type Output = Line;
|
|
|
|
fn index(&self, ptr: LocalCodePtr) -> &Self::Output {
|
|
&self.code_repo[ptr]
|
|
}
|
|
}
|
|
|
|
impl SubModuleUser for IndexStore {
|
|
fn atom_tbl(&self) -> TabledData<Atom> {
|
|
self.atom_tbl.clone()
|
|
}
|
|
|
|
fn op_dir(&mut self) -> &mut OpDir {
|
|
&mut self.op_dir
|
|
}
|
|
|
|
fn get_code_index(&self, key: PredicateKey, module: ClauseName) -> Option<CodeIndex>
|
|
{
|
|
match module.as_str() {
|
|
"user" | "builtin" => self.code_dir.get(&key).cloned(),
|
|
_ => self.modules.get(&module).and_then(|ref module| {
|
|
module.code_dir.get(&key).cloned().map(CodeIndex::from)
|
|
})
|
|
}
|
|
}
|
|
|
|
fn remove_code_index(&mut self, key: PredicateKey)
|
|
{
|
|
self.code_dir.remove(&key);
|
|
}
|
|
|
|
fn insert_dir_entry(&mut self, name: ClauseName, arity: usize, idx: CodeIndex)
|
|
{
|
|
if let Some(ref code_idx) = self.code_dir.get(&(name.clone(), arity)) {
|
|
if !code_idx.is_undefined() {
|
|
println!("warning: overwriting {}/{}", &name, arity);
|
|
}
|
|
|
|
let (p, module_name) = idx.0.borrow().clone();
|
|
set_code_index!(code_idx, p, module_name);
|
|
return;
|
|
}
|
|
|
|
self.code_dir.insert((name, arity), idx);
|
|
}
|
|
|
|
fn use_qualified_module(&mut self, code_repo: &mut CodeRepo, flags: MachineFlags,
|
|
submodule: &Module, exports: &Vec<PredicateKey>)
|
|
-> Result<(), SessionError>
|
|
{
|
|
use_qualified_module(self, submodule, exports)?;
|
|
submodule.dump_expansions(code_repo, flags).map_err(SessionError::from)
|
|
}
|
|
|
|
fn use_module(&mut self, code_repo: &mut CodeRepo, flags: MachineFlags, submodule: &Module)
|
|
-> Result<(), SessionError>
|
|
{
|
|
use_module(self, submodule)?;
|
|
|
|
if !submodule.inserted_expansions {
|
|
submodule.dump_expansions(code_repo, flags).map_err(SessionError::from)
|
|
} else {
|
|
Ok(())
|
|
}
|
|
}
|
|
}
|
|
|
|
static BUILTINS: &str = include_str!("../lib/builtins.pl");
|
|
static ERROR: &str = include_str!("../lib/error.pl");
|
|
static LISTS: &str = include_str!("../lib/lists.pl");
|
|
static NON_ISO: &str = include_str!("../lib/non_iso.pl");
|
|
static TOPLEVEL: &str = include_str!("../toplevel.pl");
|
|
|
|
impl Machine {
|
|
fn compile_special_forms(&mut self) {
|
|
match compile_special_form(self, parsing_stream(VERIFY_ATTRS.as_bytes())) {
|
|
Ok(code) => {
|
|
self.machine_st.attr_var_init.verify_attrs_loc = self.code_repo.code.len();
|
|
self.code_repo.code.extend(code.into_iter());
|
|
},
|
|
Err(_) => panic!("Machine::compile_special_forms() failed at VERIFY_ATTRS")
|
|
}
|
|
|
|
match compile_special_form(self, parsing_stream(PROJECT_ATTRS.as_bytes())) {
|
|
Ok(code) => {
|
|
self.machine_st.attr_var_init.project_attrs_loc = self.code_repo.code.len();
|
|
self.code_repo.code.extend(code.into_iter());
|
|
},
|
|
Err(_) => panic!("Machine::compile_special_forms() failed at PROJECT_ATTRS")
|
|
}
|
|
}
|
|
|
|
fn compile_top_level(&mut self) {
|
|
self.toplevel_idx = self.code_repo.code.len();
|
|
compile_user_module(self, parsing_stream(TOPLEVEL.as_bytes()));
|
|
}
|
|
|
|
fn compile_scryerrc(&mut self) {
|
|
let mut path = match dirs::home_dir() {
|
|
Some(path) => path,
|
|
None => return
|
|
};
|
|
|
|
path.push(".scryerrc");
|
|
|
|
if path.is_file() {
|
|
let file_src = match File::open(&path) {
|
|
Ok(file_handle) => parsing_stream(file_handle),
|
|
Err(_) => return
|
|
};
|
|
|
|
compile_user_module(self, file_src);
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
pub fn reset(&mut self) {
|
|
self.prolog_stream = readline::input_stream();
|
|
self.policies.cut_policy = Box::new(DefaultCutPolicy {});
|
|
self.machine_st.reset();
|
|
}
|
|
|
|
pub fn run_toplevel(&mut self) {
|
|
self.machine_st.p = CodePtr::Local(LocalCodePtr::DirEntry(self.toplevel_idx));
|
|
self.run_query(&AllocVarDict::new());
|
|
}
|
|
|
|
pub fn new(prolog_stream: PrologStream) -> Self {
|
|
let mut wam = Machine {
|
|
machine_st: MachineState::new(),
|
|
policies: MachinePolicies::new(),
|
|
indices: IndexStore::new(),
|
|
code_repo: CodeRepo::new(),
|
|
toplevel_idx: 0,
|
|
prolog_stream
|
|
};
|
|
|
|
let atom_tbl = wam.indices.atom_tbl.clone();
|
|
|
|
compile_listing(&mut wam, parsing_stream(BUILTINS.as_bytes()),
|
|
default_index_store!(atom_tbl.clone()));
|
|
|
|
wam.compile_special_forms();
|
|
wam.compile_top_level();
|
|
|
|
compile_user_module(&mut wam, parsing_stream(ERROR.as_bytes()));
|
|
compile_user_module(&mut wam, parsing_stream(LISTS.as_bytes()));
|
|
compile_user_module(&mut wam, parsing_stream(NON_ISO.as_bytes()));
|
|
|
|
wam.compile_scryerrc();
|
|
|
|
wam
|
|
}
|
|
|
|
#[inline]
|
|
pub fn machine_flags(&self) -> MachineFlags {
|
|
self.machine_st.flags
|
|
}
|
|
|
|
pub fn check_toplevel_code(&self, indices: &IndexStore) -> Result<(), SessionError>
|
|
{
|
|
for (key, idx) in &indices.code_dir {
|
|
match ClauseType::from(key.0.clone(), key.1, None) {
|
|
ClauseType::Named(..) | ClauseType::Op(..) => {},
|
|
_ => {
|
|
// ensure we don't try to overwrite the name/arity of a builtin.
|
|
let err_str = format!("{}/{}", key.0, key.1);
|
|
let err_str = clause_name!(err_str, self.indices.atom_tbl());
|
|
|
|
return Err(SessionError::CannotOverwriteBuiltIn(err_str));
|
|
}
|
|
};
|
|
|
|
if let Some(ref existing_idx) = self.indices.code_dir.get(&key) {
|
|
// ensure we don't try to overwrite an existing predicate from a different module.
|
|
if !existing_idx.is_undefined() && !idx.is_undefined() {
|
|
// allow the overwriting of user-level predicates by all other predicates.
|
|
if existing_idx.module_name().as_str() == "user" {
|
|
continue;
|
|
}
|
|
|
|
if existing_idx.module_name() != idx.module_name() {
|
|
let err_str = format!("{}/{} from module {}", key.0, key.1,
|
|
existing_idx.module_name().as_str());
|
|
let err_str = clause_name!(err_str, self.indices.atom_tbl());
|
|
|
|
return Err(SessionError::CannotOverwriteImport(err_str));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
pub fn add_batched_code(&mut self, code: Code, code_dir: CodeDir)
|
|
{
|
|
// error detection has finished, so update the master index of keys.
|
|
for (key, idx) in code_dir {
|
|
if let Some(ref mut master_idx) = self.indices.code_dir.get_mut(&key) {
|
|
// ensure we don't double borrow if master_idx == idx.
|
|
// we don't need to modify anything in that case.
|
|
if !Rc::ptr_eq(&master_idx.0, &idx.0) {
|
|
set_code_index!(master_idx, idx.0.borrow().0, idx.module_name());
|
|
}
|
|
|
|
continue;
|
|
}
|
|
|
|
self.indices.code_dir.insert(key, idx);
|
|
}
|
|
|
|
self.code_repo.code.extend(code.into_iter());
|
|
}
|
|
|
|
#[inline]
|
|
pub fn add_batched_ops(&mut self, op_dir: OpDir) {
|
|
self.indices.op_dir.extend(op_dir.into_iter());
|
|
}
|
|
|
|
#[inline]
|
|
pub fn add_module(&mut self, module: Module, code: Code) {
|
|
self.indices.modules.insert(module.module_decl.name.clone(), module);
|
|
self.code_repo.code.extend(code.into_iter());
|
|
}
|
|
|
|
pub fn submit_query(&mut self, code: Code, alloc_locs: AllocVarDict) -> EvalSession
|
|
{
|
|
self.code_repo.cached_query = code;
|
|
self.run_query(&alloc_locs);
|
|
|
|
if self.machine_st.fail {
|
|
EvalSession::QueryFailure
|
|
} else {
|
|
EvalSession::InitialQuerySuccess(alloc_locs)
|
|
}
|
|
}
|
|
|
|
pub fn throw_session_error(&mut self, err: SessionError, key: PredicateKey) {
|
|
let h = self.machine_st.heap.h;
|
|
|
|
let err = MachineError::session_error(h, err);
|
|
let stub = MachineError::functor_stub(key.0, key.1);
|
|
let err = self.machine_st.error_form(err, stub);
|
|
|
|
self.machine_st.throw_exception(err);
|
|
return;
|
|
}
|
|
|
|
fn handle_toplevel_command(&mut self, code_ptr: REPLCodePtr, p: LocalCodePtr)
|
|
{
|
|
match code_ptr {
|
|
REPLCodePtr::CompileBatch => {
|
|
#[cfg(feature = "readline_rs_compat")]
|
|
readline::set_line_mode(readline::LineMode::Multi);
|
|
|
|
let src = readline::input_stream();
|
|
|
|
#[cfg(feature = "readline_rs_compat")]
|
|
readline::set_line_mode(readline::LineMode::Single);
|
|
|
|
match compile_user_module(self, src) {
|
|
EvalSession::Error(e) => self.throw_session_error(e, (clause_name!("repl"), 0)),
|
|
_ => {}
|
|
};
|
|
},
|
|
REPLCodePtr::SubmitQueryAndPrintResults => {
|
|
let term = self.machine_st[temp_v!(1)].clone();
|
|
let stub = MachineError::functor_stub(clause_name!("repl"), 0);
|
|
|
|
let s = match self.machine_st.try_from_list(temp_v!(2), stub) {
|
|
Ok(addrs) => {
|
|
let mut var_dict = HeapVarDict::new();
|
|
|
|
for addr in addrs {
|
|
match addr {
|
|
Addr::Str(s) => {
|
|
let var_atom = match self.machine_st.heap[s+1].as_addr(s+1) {
|
|
Addr::Con(Constant::Atom(var_atom, _)) =>
|
|
Rc::new(var_atom.to_string()),
|
|
_ => unreachable!()
|
|
};
|
|
|
|
let var_addr = self.machine_st.heap[s+2].as_addr(s+2);
|
|
var_dict.insert(var_atom, var_addr);
|
|
},
|
|
_ => unreachable!()
|
|
};
|
|
}
|
|
|
|
self.machine_st.heap_locs = var_dict;
|
|
let term_output = self.machine_st.print_query(term, &self.indices.op_dir);
|
|
|
|
term_output.result()
|
|
},
|
|
Err(err_stub) => {
|
|
self.machine_st.throw_exception(err_stub);
|
|
return;
|
|
}
|
|
};
|
|
|
|
let stream = parsing_stream(s.as_bytes());
|
|
|
|
let snapshot = self.machine_st.sink_to_snapshot();
|
|
self.machine_st.reset();
|
|
|
|
let result = match stream_to_toplevel(stream, self) {
|
|
Ok(packet) => compile_term(self, packet),
|
|
Err(e) => EvalSession::from(e)
|
|
};
|
|
|
|
self.handle_eval_session(result, snapshot);
|
|
}
|
|
}
|
|
|
|
self.machine_st.p = CodePtr::Local(p);
|
|
}
|
|
|
|
fn propagate_exception_to_toplevel(&mut self, snapshot: MachineState) {
|
|
let ball = self.machine_st.ball.take();
|
|
|
|
self.machine_st.absorb_snapshot(snapshot);
|
|
self.machine_st.ball = ball;
|
|
|
|
let stub = self.machine_st.copy_and_align_ball();
|
|
self.machine_st.throw_exception(stub);
|
|
|
|
return;
|
|
}
|
|
|
|
fn handle_eval_session(&mut self, result: EvalSession, snapshot: MachineState) {
|
|
match result {
|
|
EvalSession::InitialQuerySuccess(alloc_locs) =>
|
|
loop {
|
|
let bindings = {
|
|
let output = PrinterOutputter::new();
|
|
self.toplevel_heap_view(output).result()
|
|
};
|
|
|
|
let attr_goals = self.attribute_goals();
|
|
|
|
if !(self.machine_st.b > 0) {
|
|
if bindings.is_empty() {
|
|
let space = if requires_space(&attr_goals, ".") { " " } else { "" };
|
|
|
|
if !attr_goals.is_empty() {
|
|
println!("{}{}.", attr_goals, space);
|
|
} else {
|
|
println!("true.");
|
|
}
|
|
|
|
self.machine_st.absorb_snapshot(snapshot);
|
|
return;
|
|
}
|
|
} else if bindings.is_empty() && attr_goals.is_empty() {
|
|
print!("true");
|
|
stdout().flush().unwrap();
|
|
}
|
|
|
|
let mut raw_stdout = stdout().into_raw_mode().unwrap();
|
|
|
|
if !attr_goals.is_empty() {
|
|
if bindings.is_empty() {
|
|
write!(raw_stdout, "{}", attr_goals).unwrap();
|
|
} else {
|
|
write!(raw_stdout, "{}, {}", bindings, attr_goals).unwrap();
|
|
}
|
|
} else if !bindings.is_empty() {
|
|
write!(raw_stdout, "{}", bindings).unwrap();
|
|
}
|
|
|
|
if self.machine_st.b > 0 {
|
|
raw_stdout.flush().unwrap();
|
|
|
|
let result = match next_keypress() {
|
|
ContinueResult::ContinueQuery => {
|
|
write!(raw_stdout, " ;\r\n").unwrap();
|
|
self.continue_query(&alloc_locs)
|
|
},
|
|
ContinueResult::Conclude => {
|
|
write!(raw_stdout, " ...\r\n").unwrap();
|
|
self.machine_st.absorb_snapshot(snapshot);
|
|
return;
|
|
}
|
|
};
|
|
|
|
let mut raw_stdout = stdout().into_raw_mode().unwrap();
|
|
|
|
match result {
|
|
EvalSession::QueryFailure =>
|
|
if self.machine_st.ball.stub.len() > 0 {
|
|
self.propagate_exception_to_toplevel(snapshot);
|
|
return;
|
|
} else {
|
|
write!(raw_stdout, "false.\r\n").unwrap();
|
|
raw_stdout.flush().unwrap();
|
|
|
|
self.machine_st.absorb_snapshot(snapshot);
|
|
return;
|
|
},
|
|
EvalSession::Error(err) => {
|
|
self.machine_st.absorb_snapshot(snapshot);
|
|
self.throw_session_error(err, (clause_name!("repl"), 0));
|
|
return;
|
|
},
|
|
_ => {}
|
|
}
|
|
} else {
|
|
if bindings.is_empty() && attr_goals.is_empty() {
|
|
write!(raw_stdout, "true.\r\n").unwrap();
|
|
} else {
|
|
let space = if !attr_goals.is_empty() {
|
|
if requires_space(&attr_goals, ".") { " " } else { "" }
|
|
} else {
|
|
if requires_space(&bindings, ".") { " " } else { "" }
|
|
};
|
|
|
|
write!(raw_stdout, "{}.\r\n", space).unwrap();
|
|
}
|
|
|
|
break;
|
|
}
|
|
},
|
|
EvalSession::Error(err) => {
|
|
self.machine_st.absorb_snapshot(snapshot);
|
|
self.throw_session_error(err, (clause_name!("repl"), 0));
|
|
return;
|
|
},
|
|
EvalSession::QueryFailure =>
|
|
if self.machine_st.ball.stub.len() > 0 {
|
|
return self.propagate_exception_to_toplevel(snapshot);
|
|
} else {
|
|
println!("false.");
|
|
},
|
|
_ => {}
|
|
}
|
|
|
|
self.machine_st.absorb_snapshot(snapshot);
|
|
}
|
|
|
|
pub(super)
|
|
fn run_query(&mut self, alloc_locs: &AllocVarDict)
|
|
{
|
|
let end_ptr = top_level_code_ptr!(0, self.code_repo.size_of_cached_query());
|
|
|
|
while self.machine_st.p < end_ptr {
|
|
if let CodePtr::Local(LocalCodePtr::TopLevel(mut cn, p)) = self.machine_st.p {
|
|
match &self.code_repo[LocalCodePtr::TopLevel(cn, p)] {
|
|
&Line::Control(ref ctrl_instr) if ctrl_instr.is_jump_instr() => {
|
|
self.machine_st.record_var_places(cn, alloc_locs);
|
|
cn += 1;
|
|
},
|
|
_ => {}
|
|
}
|
|
|
|
self.machine_st.p = top_level_code_ptr!(cn, p);
|
|
}
|
|
|
|
self.machine_st.query_stepper(&mut self.indices, &mut self.policies, &mut self.code_repo,
|
|
&mut self.prolog_stream);
|
|
|
|
match self.machine_st.p {
|
|
CodePtr::Local(LocalCodePtr::TopLevel(_, p)) if p > 0 => {},
|
|
CodePtr::REPL(code_ptr, p) =>
|
|
self.handle_toplevel_command(code_ptr, p),
|
|
CodePtr::DynamicTransaction(trans_type, p) => {
|
|
// self.code_repo.cached_query is about to be overwritten by the term expander,
|
|
// so hold onto it locally and restore it after the compiler has finished.
|
|
self.machine_st.fail = false;
|
|
let cached_query = mem::replace(&mut self.code_repo.cached_query, vec![]);
|
|
self.dynamic_transaction(trans_type, p);
|
|
|
|
if let CodePtr::Local(LocalCodePtr::TopLevel(_, 0)) = self.machine_st.p {
|
|
if self.machine_st.heap_locs.is_empty() {
|
|
self.machine_st.record_var_places(0, alloc_locs);
|
|
}
|
|
|
|
self.code_repo.cached_query = cached_query;
|
|
break;
|
|
}
|
|
|
|
self.code_repo.cached_query = cached_query;
|
|
},
|
|
_ => {
|
|
if self.machine_st.heap_locs.is_empty() {
|
|
self.machine_st.record_var_places(0, alloc_locs);
|
|
}
|
|
|
|
break;
|
|
}
|
|
};
|
|
}
|
|
}
|
|
|
|
pub fn continue_query(&mut self, alloc_locs: &AllocVarDict) -> EvalSession
|
|
{
|
|
if !self.or_stack_is_empty() {
|
|
let b = self.machine_st.b - 1;
|
|
self.machine_st.p = self.machine_st.or_stack[b].bp.clone();
|
|
|
|
if let CodePtr::Local(LocalCodePtr::TopLevel(_, 0)) = self.machine_st.p {
|
|
self.machine_st.fail = true;
|
|
return EvalSession::QueryFailure;
|
|
}
|
|
|
|
self.run_query(alloc_locs);
|
|
|
|
if self.machine_st.fail {
|
|
EvalSession::QueryFailure
|
|
} else {
|
|
EvalSession::SubsequentQuerySuccess
|
|
}
|
|
} else {
|
|
EvalSession::QueryFailure
|
|
}
|
|
}
|
|
|
|
pub fn toplevel_heap_view<Outputter>(&self, mut output: Outputter) -> Outputter
|
|
where Outputter: HCValueOutputter
|
|
{
|
|
let mut sorted_vars: Vec<_> = self.machine_st.heap_locs.iter().collect();
|
|
sorted_vars.sort_by_key(|ref v| v.0);
|
|
|
|
for (var, addr) in sorted_vars {
|
|
let addr = self.machine_st.store(self.machine_st.deref(addr.clone()));
|
|
output = self.machine_st.print_var_eq(var.clone(), addr, &self.indices.op_dir,
|
|
output);
|
|
}
|
|
|
|
output
|
|
}
|
|
|
|
#[cfg(test)]
|
|
pub fn test_heap_view<Outputter>(&self, mut output: Outputter) -> Outputter
|
|
where Outputter: HCValueOutputter
|
|
{
|
|
let mut sorted_vars: Vec<(&Rc<Var>, &Addr)> = self.machine_st.heap_locs.iter().collect();
|
|
sorted_vars.sort_by_key(|ref v| v.0);
|
|
|
|
for (var, addr) in sorted_vars {
|
|
output = self.machine_st.print_var_eq(var.clone(), addr.clone(), &self.indices.op_dir,
|
|
output);
|
|
}
|
|
|
|
output
|
|
}
|
|
|
|
pub fn or_stack_is_empty(&self) -> bool {
|
|
self.machine_st.b == 0
|
|
}
|
|
}
|
|
|
|
impl MachineState {
|
|
fn record_var_places(&mut self, chunk_num: usize, alloc_locs: &AllocVarDict)
|
|
{
|
|
for (var, var_data) in alloc_locs {
|
|
match var_data {
|
|
&VarData::Perm(p) if p > 0 =>
|
|
if !self.heap_locs.contains_key(var) {
|
|
let e = self.e;
|
|
let r = var_data.as_reg_type().reg_num();
|
|
let addr = self.and_stack[e][r].clone();
|
|
|
|
self.heap_locs.insert(var.clone(), addr);
|
|
},
|
|
&VarData::Temp(cn, _, _) if cn == chunk_num => {
|
|
let r = var_data.as_reg_type();
|
|
|
|
if r.reg_num() != 0 {
|
|
let addr = self[r].clone();
|
|
self.heap_locs.insert(var.clone(), addr);
|
|
}
|
|
},
|
|
_ => {}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn print_query(&mut self, addr: Addr, op_dir: &OpDir) -> PrinterOutputter
|
|
{
|
|
let flags = self.flags;
|
|
|
|
let mut output = {
|
|
self.flags = MachineFlags { double_quotes: DoubleQuotes::Atom };
|
|
|
|
let output = PrinterOutputter::new();
|
|
let mut printer = HCPrinter::from_heap_locs(&self, op_dir, output);
|
|
|
|
printer.quoted = true;
|
|
printer.numbervars = false;
|
|
printer.drop_toplevel_spec();
|
|
|
|
printer.see_all_locs();
|
|
printer.print(addr)
|
|
};
|
|
|
|
self.flags = flags;
|
|
|
|
output.append(".");
|
|
output
|
|
}
|
|
|
|
fn dispatch_instr(&mut self, instr: &Line, indices: &mut IndexStore, policies: &mut MachinePolicies,
|
|
code_repo: &CodeRepo, prolog_stream: &mut PrologStream)
|
|
{
|
|
match instr {
|
|
&Line::Arithmetic(ref arith_instr) =>
|
|
self.execute_arith_instr(arith_instr),
|
|
&Line::Choice(ref choice_instr) =>
|
|
self.execute_choice_instr(choice_instr, &mut policies.call_policy),
|
|
&Line::Cut(ref cut_instr) =>
|
|
self.execute_cut_instr(cut_instr, &mut policies.cut_policy),
|
|
&Line::Control(ref control_instr) =>
|
|
self.execute_ctrl_instr(indices, code_repo, &mut policies.call_policy,
|
|
&mut policies.cut_policy, prolog_stream,
|
|
control_instr),
|
|
&Line::Fact(ref fact_instr) => {
|
|
self.execute_fact_instr(&fact_instr);
|
|
self.p += 1;
|
|
},
|
|
&Line::Indexing(ref indexing_instr) =>
|
|
self.execute_indexing_instr(&indexing_instr),
|
|
&Line::IndexedChoice(ref choice_instr) =>
|
|
self.execute_indexed_choice_instr(choice_instr, &mut policies.call_policy),
|
|
&Line::Query(ref query_instr) => {
|
|
self.execute_query_instr(&query_instr);
|
|
self.p += 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
fn execute_instr(&mut self, indices: &mut IndexStore, policies: &mut MachinePolicies,
|
|
code_repo: &CodeRepo, prolog_stream: &mut PrologStream)
|
|
{
|
|
let instr = match code_repo.lookup_instr(self.last_call, &self.p) {
|
|
Some(instr) => instr,
|
|
None => return
|
|
};
|
|
|
|
self.dispatch_instr(instr.as_ref(), indices, policies, code_repo, prolog_stream);
|
|
}
|
|
|
|
fn backtrack(&mut self)
|
|
{
|
|
if self.b > 0 {
|
|
let b = self.b - 1;
|
|
|
|
self.b0 = self.or_stack[b].b0;
|
|
self.p = self.or_stack[b].bp.clone();
|
|
|
|
if let CodePtr::Local(LocalCodePtr::TopLevel(_, p)) = self.p {
|
|
self.fail = p == 0;
|
|
} else {
|
|
self.fail = false;
|
|
}
|
|
} else {
|
|
self.p = CodePtr::Local(LocalCodePtr::TopLevel(0, 0));
|
|
}
|
|
}
|
|
|
|
fn check_machine_index(&mut self, code_repo: &CodeRepo) -> bool {
|
|
match self.p {
|
|
CodePtr::Local(LocalCodePtr::DirEntry(p))
|
|
if p < code_repo.code.len() => {},
|
|
CodePtr::Local(LocalCodePtr::UserTermExpansion(p))
|
|
if p < code_repo.term_expanders.len() => {},
|
|
CodePtr::Local(LocalCodePtr::UserTermExpansion(_)) =>
|
|
self.fail = true,
|
|
CodePtr::Local(LocalCodePtr::UserGoalExpansion(p))
|
|
if p < code_repo.goal_expanders.len() => {},
|
|
CodePtr::Local(LocalCodePtr::UserGoalExpansion(_)) =>
|
|
self.fail = true,
|
|
CodePtr::Local(LocalCodePtr::InSituDirEntry(p))
|
|
if p < code_repo.in_situ_code.len() => {},
|
|
CodePtr::Local(_) | CodePtr::REPL(..) =>
|
|
return false,
|
|
CodePtr::DynamicTransaction(..) => {
|
|
// prevent use of dynamic transactions from
|
|
// succeeding in expansions. self.fail will be toggled
|
|
// back to false later.
|
|
self.fail = true;
|
|
return false;
|
|
},
|
|
_ => {}
|
|
}
|
|
|
|
true
|
|
}
|
|
|
|
// return true iff verify_attr_interrupt is called.
|
|
fn verify_attr_stepper(&mut self, indices: &mut IndexStore, policies: &mut MachinePolicies,
|
|
code_repo: &mut CodeRepo, prolog_stream: &mut PrologStream)
|
|
-> bool
|
|
{
|
|
loop {
|
|
let instr = match code_repo.lookup_instr(self.last_call, &self.p) {
|
|
Some(instr) => {
|
|
if instr.as_ref().is_head_instr() {
|
|
instr
|
|
} else {
|
|
let cp = self.p.local();
|
|
self.run_verify_attr_interrupt(cp);
|
|
return true;
|
|
}
|
|
},
|
|
None => return false
|
|
};
|
|
|
|
self.dispatch_instr(instr.as_ref(), indices, policies, code_repo, prolog_stream);
|
|
|
|
if self.fail {
|
|
self.backtrack();
|
|
}
|
|
|
|
if !self.check_machine_index(code_repo) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
fn run_verify_attr_interrupt(&mut self, cp: LocalCodePtr) {
|
|
let p = self.attr_var_init.verify_attrs_loc;
|
|
|
|
self.attr_var_init.cp = cp;
|
|
self.verify_attr_interrupt(p);
|
|
}
|
|
|
|
fn query_stepper(&mut self, indices: &mut IndexStore, policies: &mut MachinePolicies,
|
|
code_repo: &mut CodeRepo, prolog_stream: &mut PrologStream)
|
|
{
|
|
loop {
|
|
self.execute_instr(indices, policies, code_repo, prolog_stream);
|
|
|
|
if self.fail {
|
|
self.backtrack();
|
|
}
|
|
|
|
match self.p {
|
|
CodePtr::VerifyAttrInterrupt(_) => {
|
|
self.p = CodePtr::Local(self.attr_var_init.cp + 1);
|
|
|
|
if !self.verify_attr_stepper(indices, policies, code_repo, prolog_stream) {
|
|
if self.fail {
|
|
break;
|
|
}
|
|
|
|
let cp = self.p.local();
|
|
self.run_verify_attr_interrupt(cp);
|
|
}
|
|
},
|
|
_ =>
|
|
if !self.check_machine_index(code_repo) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|