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Fix bug with eager optimization of method calls.

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This commit is contained in:
Stephen Chung 2022-03-04 12:22:44 +08:00
parent 14e23ed74c
commit 0335035b0f
6 changed files with 76 additions and 40 deletions
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1
CHANGELOG.md
View File

@ -15,6 +15,7 @@ Bug fixes
* Invalid property or method access such as `a.b::c.d` or `a.b::func()` no longer panics but properly returns a syntax error.
* `Scope::is_constant` now returns the correct value.
* Exporting a variable that contains a local function pointer (including anonymous function or closure) now raises a runtime error.
* Full optimization is now skipped for method calls.
Breaking changes
----------------

21
src/ast/expr.rs
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@ -197,16 +197,18 @@ impl fmt::Debug for FnCallExpr {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut ff = f.debug_struct("FnCallExpr");
#[cfg(not(feature = "no_module"))]
self.namespace.as_ref().map(|ns| ff.field("namespace", ns));
ff.field("name", &self.name)
.field("hash", &self.hashes)
.field("arg_exprs", &self.args);
if !self.constants.is_empty() {
ff.field("constant_args", &self.constants);
if let Some(ref ns) = self.namespace {
ff.field("namespace", ns);
}
if self.capture_parent_scope {
ff.field("capture_parent_scope", &self.capture_parent_scope);
}
ff.field("hash", &self.hashes)
.field("name", &self.name)
.field("args", &self.args);
if !self.constants.is_empty() {
ff.field("constants", &self.constants);
}
ff.field("pos", &self.pos);
ff.finish()
}
@ -405,6 +407,8 @@ pub enum Expr {
Box<((Identifier, u64), (Identifier, u64), ImmutableString)>,
Position,
),
/// xxx `.` method `(` expr `,` ... `)`
MethodCall(Box<FnCallExpr>, Position),
/// Stack slot for function calls. See [`FnCallExpr`] for more details.
///
/// This variant does not map to any language structure. It is used in function calls with
@ -485,6 +489,7 @@ impl fmt::Debug for Expr {
f.write_str(")")
}
Self::Property(x, ..) => write!(f, "Property({})", x.2),
Self::MethodCall(x, ..) => f.debug_tuple("MethodCall").field(x).finish(),
Self::Stack(x, ..) => write!(f, "ConstantArg[{}]", x),
Self::Stmt(x) => {
let pos = x.span();
@ -708,7 +713,7 @@ impl Expr {
| Self::InterpolatedString(.., pos)
| Self::Property(.., pos) => *pos,
Self::FnCall(x, ..) => x.pos,
Self::FnCall(x, ..) | Self::MethodCall(x, ..) => x.pos,
Self::Stmt(x) => x.position(),
}
@ -756,6 +761,7 @@ impl Expr {
| Self::Variable(.., pos, _)
| Self::Stack(.., pos)
| Self::FnCall(.., pos)
| Self::MethodCall(.., pos)
| Self::Custom(.., pos)
| Self::InterpolatedString(.., pos)
| Self::Property(.., pos) => *pos = new_pos,
@ -839,6 +845,7 @@ impl Expr {
| Self::StringConstant(..)
| Self::InterpolatedString(..)
| Self::FnCall(..)
| Self::MethodCall(..)
| Self::Stmt(..)
| Self::Dot(..)
| Self::Index(..)

22
src/eval/chaining.rs
View File

@ -252,7 +252,7 @@ impl Engine {
ChainType::Dotting => {
match rhs {
// xxx.fn_name(arg_expr_list)
Expr::FnCall(x, pos) if !x.is_qualified() && new_val.is_none() => {
Expr::MethodCall(x, pos) if !x.is_qualified() && new_val.is_none() => {
let crate::ast::FnCallExpr { name, hashes, .. } = x.as_ref();
let call_args = &mut idx_val.into_fn_call_args();
@ -271,11 +271,11 @@ impl Engine {
result
}
// xxx.fn_name(...) = ???
Expr::FnCall(..) if new_val.is_some() => {
Expr::MethodCall(..) if new_val.is_some() => {
unreachable!("method call cannot be assigned to")
}
// xxx.module::fn_name(...) - syntax error
Expr::FnCall(..) => {
Expr::MethodCall(..) => {
unreachable!("function call in dot chain should not be namespace-qualified")
}
// {xxx:map}.id op= ???
@ -428,7 +428,7 @@ impl Engine {
)?
}
// {xxx:map}.fn_name(arg_expr_list)[expr] | {xxx:map}.fn_name(arg_expr_list).expr
Expr::FnCall(ref x, pos) if !x.is_qualified() => {
Expr::MethodCall(ref x, pos) if !x.is_qualified() => {
let crate::ast::FnCallExpr { name, hashes, .. } = x.as_ref();
let call_args = &mut idx_val.into_fn_call_args();
@ -448,7 +448,7 @@ impl Engine {
result?.0.into()
}
// {xxx:map}.module::fn_name(...) - syntax error
Expr::FnCall(..) => unreachable!(
Expr::MethodCall(..) => unreachable!(
"function call in dot chain should not be namespace-qualified"
),
// Others - syntax error
@ -549,7 +549,7 @@ impl Engine {
Ok((result, may_be_changed))
}
// xxx.fn_name(arg_expr_list)[expr] | xxx.fn_name(arg_expr_list).expr
Expr::FnCall(ref f, pos) if !f.is_qualified() => {
Expr::MethodCall(ref f, pos) if !f.is_qualified() => {
let crate::ast::FnCallExpr { name, hashes, .. } = f.as_ref();
let rhs_chain = rhs.into();
let args = &mut idx_val.into_fn_call_args();
@ -576,7 +576,7 @@ impl Engine {
.map_err(|err| err.fill_position(pos))
}
// xxx.module::fn_name(...) - syntax error
Expr::FnCall(..) => unreachable!(
Expr::MethodCall(..) => unreachable!(
"function call in dot chain should not be namespace-qualified"
),
// Others - syntax error
@ -681,7 +681,7 @@ impl Engine {
match expr {
#[cfg(not(feature = "no_object"))]
Expr::FnCall(x, ..)
Expr::MethodCall(x, ..)
if _parent_chain_type == ChainType::Dotting && !x.is_qualified() =>
{
let crate::ast::FnCallExpr {
@ -705,7 +705,7 @@ impl Engine {
idx_values.push(super::ChainArgument::from_fn_call_args(values, pos));
}
#[cfg(not(feature = "no_object"))]
Expr::FnCall(..) if _parent_chain_type == ChainType::Dotting => {
Expr::MethodCall(..) if _parent_chain_type == ChainType::Dotting => {
unreachable!("function call in dot chain should not be namespace-qualified")
}
@ -729,7 +729,7 @@ impl Engine {
Expr::Property(..) => unreachable!("unexpected Expr::Property for indexing"),
#[cfg(not(feature = "no_object"))]
Expr::FnCall(x, ..)
Expr::MethodCall(x, ..)
if _parent_chain_type == ChainType::Dotting && !x.is_qualified() =>
{
let crate::ast::FnCallExpr {
@ -752,7 +752,7 @@ impl Engine {
super::ChainArgument::from_fn_call_args(values, pos)
}
#[cfg(not(feature = "no_object"))]
Expr::FnCall(..) if _parent_chain_type == ChainType::Dotting => {
Expr::MethodCall(..) if _parent_chain_type == ChainType::Dotting => {
unreachable!("function call in dot chain should not be namespace-qualified")
}
#[cfg(not(feature = "no_object"))]

6
src/optimizer.rs
View File

@ -1143,7 +1143,7 @@ fn optimize_expr(expr: &mut Expr, state: &mut OptimizerState, chaining: bool) {
// Eagerly call functions
Expr::FnCall(x, pos)
if !x.is_qualified() // Non-qualified
if !x.is_qualified() // non-qualified
&& state.optimization_level == OptimizationLevel::Full // full optimizations
&& x.args.iter().all(Expr::is_constant) // all arguments are constants
=> {
@ -1176,8 +1176,8 @@ fn optimize_expr(expr: &mut Expr, state: &mut OptimizerState, chaining: bool) {
x.args.iter_mut().for_each(|a| optimize_expr(a, state, false));
}
// id(args ..) -> optimize function call arguments
Expr::FnCall(x, ..) => for arg in x.args.iter_mut() {
// id(args ..) or xxx.id(args ..) -> optimize function call arguments
Expr::FnCall(x, ..) | Expr::MethodCall(x, ..) => for arg in x.args.iter_mut() {
optimize_expr(arg, state, false);
// Move constant arguments

8
src/parser.rs
View File

@ -521,8 +521,8 @@ impl Engine {
namespace,
hashes,
args,
constants: StaticVec::new_const(),
pos: settings.pos,
..Default::default()
}
.into_fn_call_expr(settings.pos));
}
@ -586,8 +586,8 @@ impl Engine {
namespace,
hashes,
args,
constants: StaticVec::new_const(),
pos: settings.pos,
..Default::default()
}
.into_fn_call_expr(settings.pos));
}
@ -1990,7 +1990,7 @@ impl Engine {
calc_fn_hash(&func.name, func.args.len() + 1),
);
let rhs = Expr::FnCall(func, func_pos);
let rhs = Expr::MethodCall(func, func_pos);
Ok(Expr::Dot(
BinaryExpr { lhs, rhs }.into(),
ASTFlags::NONE,
@ -2046,7 +2046,7 @@ impl Engine {
);
let new_lhs = BinaryExpr {
lhs: Expr::FnCall(func, func_pos),
lhs: Expr::MethodCall(func, func_pos),
rhs: x.rhs,
}
.into();

42
tests/method_call.rs
View File

@ -2,14 +2,12 @@
use rhai::{Engine, EvalAltResult, INT};
#[test]
fn test_method_call() -> Result<(), Box<EvalAltResult>> {
#[derive(Debug, Clone, Eq, PartialEq)]
struct TestStruct {
#[derive(Debug, Clone, Eq, PartialEq)]
struct TestStruct {
x: INT,
}
}
impl TestStruct {
impl TestStruct {
fn update(&mut self, n: INT) {
self.x += n;
}
@ -17,8 +15,10 @@ fn test_method_call() -> Result<(), Box<EvalAltResult>> {
fn new() -> Self {
Self { x: 1 }
}
}
}
#[test]
fn test_method_call() -> Result<(), Box<EvalAltResult>> {
let mut engine = Engine::new();
engine
@ -47,3 +47,31 @@ fn test_method_call_style() -> Result<(), Box<EvalAltResult>> {
Ok(())
}
#[cfg(not(feature = "no_optimize"))]
#[test]
fn test_method_call_with_full_optimization() -> Result<(), Box<EvalAltResult>> {
let mut engine = Engine::new();
engine.set_optimization_level(rhai::OptimizationLevel::Full);
engine
.register_fn("new_ts", || TestStruct::new())
.register_fn("ymd", |_: INT, _: INT, _: INT| 42 as INT)
.register_fn("range", |_: &mut TestStruct, _: INT, _: INT| {
TestStruct::new()
});
assert_eq!(
engine.eval::<TestStruct>(
"
let xs = new_ts();
let ys = xs.range(ymd(2022, 2, 1), ymd(2022, 2, 2));
ys
"
)?,
TestStruct::new()
);
Ok(())
}