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use crate::{
function_target::{FunctionData, FunctionTarget},
stackless_bytecode::{AttrId, Bytecode, HavocKind, Label, Operation, PropKind},
};
use move_model::{
ast::{Exp, TempIndex},
exp_generator::ExpGenerator,
model::{FunctionEnv, Loc},
ty::Type,
};
#[derive(Default)]
pub struct FunctionDataBuilderOptions {
pub no_fallthrough_jump_removal: bool,
}
pub struct FunctionDataBuilder<'env> {
pub fun_env: &'env FunctionEnv<'env>,
pub data: FunctionData,
pub options: FunctionDataBuilderOptions,
next_free_attr_index: usize,
next_free_label_index: usize,
current_loc: Loc,
next_vc_info: Option<String>,
next_debug_comment: Option<String>,
}
impl<'env> ExpGenerator<'env> for FunctionDataBuilder<'env> {
fn function_env(&self) -> &FunctionEnv<'env> {
self.fun_env
}
fn get_current_loc(&self) -> Loc {
self.current_loc.clone()
}
fn set_loc(&mut self, loc: Loc) {
self.current_loc = loc;
}
fn add_local(&mut self, ty: Type) -> TempIndex {
let idx = self.data.local_types.len();
self.data.local_types.push(ty);
idx
}
fn get_local_type(&self, temp: TempIndex) -> Type {
self.data
.local_types
.get(temp)
.expect("local variable")
.clone()
}
}
impl<'env> FunctionDataBuilder<'env> {
pub fn new_with_options(
fun_env: &'env FunctionEnv<'env>,
data: FunctionData,
options: FunctionDataBuilderOptions,
) -> Self {
let next_free_attr_index = data.next_free_attr_index();
let next_free_label_index = data.next_free_label_index();
FunctionDataBuilder {
fun_env,
data,
options,
next_free_attr_index,
next_free_label_index,
current_loc: fun_env.get_loc(),
next_vc_info: None,
next_debug_comment: None,
}
}
pub fn new(fun_env: &'env FunctionEnv<'env>, data: FunctionData) -> Self {
Self::new_with_options(fun_env, data, FunctionDataBuilderOptions::default())
}
pub fn get_target(&self) -> FunctionTarget<'_> {
FunctionTarget::new(self.fun_env, &self.data)
}
pub fn add_return(&mut self, ty: Type) -> usize {
let idx = self.data.return_types.len();
self.data.return_types.push(ty);
idx
}
pub fn set_loc_and_vc_info(&mut self, loc: Loc, message: &str) {
self.next_vc_info = Some(message.to_string());
self.set_loc(loc);
}
pub fn set_loc_from_attr(&mut self, attr_id: AttrId) {
let loc = if let Some(l) = self.data.locations.get(&attr_id) {
l.clone()
} else {
self.global_env().unknown_loc()
};
self.current_loc = loc;
}
pub fn get_loc(&self, attr_id: AttrId) -> Loc {
self.data
.locations
.get(&attr_id)
.cloned()
.unwrap_or_else(|| self.fun_env.get_loc())
}
pub fn new_attr(&mut self) -> AttrId {
let id = AttrId::new(self.next_free_attr_index);
self.next_free_attr_index += 1;
self.data.locations.insert(id, self.current_loc.clone());
id
}
pub fn new_label(&mut self) -> Label {
let label = Label::new(self.next_free_label_index);
self.next_free_label_index += 1;
label
}
pub fn emit(&mut self, bc: Bytecode) {
use Bytecode::*;
let no_fallthrough_jump_removal = self.options.no_fallthrough_jump_removal;
match (self.data.code.last(), &bc) {
(Some(Jump(_, label1)), Label(_, label2))
if !no_fallthrough_jump_removal && label1 == label2 =>
{
*self.data.code.last_mut().unwrap() = bc;
}
_ => {
self.data.code.push(bc);
}
}
}
pub fn emit_vec(&mut self, bcs: Vec<Bytecode>) {
for bc in bcs {
self.emit(bc);
}
}
pub fn emit_with<F>(&mut self, f: F)
where
F: FnOnce(AttrId) -> Bytecode,
{
let attr_id = self.new_attr();
if let Some(info) = std::mem::take(&mut self.next_vc_info) {
self.data.vc_infos.insert(attr_id, info);
}
if let Some(comment) = std::mem::take(&mut self.next_debug_comment) {
self.data.debug_comments.insert(attr_id, comment);
}
self.emit(f(attr_id))
}
pub fn set_next_debug_comment(&mut self, comment: String) {
self.next_debug_comment = Some(comment);
}
pub fn clear_next_debug_comment(&mut self) {
self.next_debug_comment = None;
}
pub fn emit_let(&mut self, def: Exp) -> (TempIndex, Exp) {
let ty = self.global_env().get_node_type(def.node_id());
let temp = self.new_temp(ty);
let temp_exp = self.mk_temporary(temp);
let definition = self.mk_identical(temp_exp.clone(), def);
self.emit_with(|id| Bytecode::Prop(id, PropKind::Assume, definition));
(temp, temp_exp)
}
pub fn emit_let_havoc(&mut self, ty: Type) -> (TempIndex, Exp) {
let havoc_kind = if ty.is_mutable_reference() {
HavocKind::MutationAll
} else {
HavocKind::Value
};
let temp = self.new_temp(ty);
let temp_exp = self.mk_temporary(temp);
self.emit_with(|id| {
Bytecode::Call(id, vec![], Operation::Havoc(havoc_kind), vec![temp], None)
});
(temp, temp_exp)
}
}