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Short-circuit optimizations for special keywords.

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This commit is contained in:
Stephen Chung 2021-07-14 13:57:58 +08:00
parent 5def8f04bd
commit 0e77c4f9a0
1 changed files with 67 additions and 76 deletions
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99
src/optimize.rs
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@ -2,7 +2,9 @@
use crate::ast::{Expr, OpAssignment, Stmt};
use crate::dynamic::AccessMode;
use crate::engine::{KEYWORD_DEBUG, KEYWORD_EVAL, KEYWORD_FN_PTR, KEYWORD_PRINT, KEYWORD_TYPE_OF};
use crate::engine::{
KEYWORD_DEBUG, KEYWORD_EVAL, KEYWORD_FN_PTR, KEYWORD_IS_SHARED, KEYWORD_PRINT, KEYWORD_TYPE_OF,
};
use crate::fn_builtin::get_builtin_binary_op_fn;
use crate::fn_hash::get_hasher;
use crate::token::Token;
@ -118,33 +120,18 @@ impl<'a> OptimizerState<'a> {
}
})
}
}
// Has a system function a Rust-native override?
fn has_native_fn(state: &OptimizerState, hash_script: u64, arg_types: &[TypeId]) -> bool {
let hash_params = calc_fn_params_hash(arg_types.iter().cloned());
let hash = combine_hashes(hash_script, hash_params);
// First check registered functions
state.engine.global_namespace.contains_fn(hash)
// Then check packages
|| state.engine.global_modules.iter().any(|m| m.contains_fn(hash))
// Then check sub-modules
|| state.engine.global_sub_modules.values().any(|m| m.contains_qualified_fn(hash))
}
/// Call a registered function
fn call_fn_with_constant_arguments(
state: &OptimizerState,
#[inline(always)]
pub fn call_fn_with_constant_arguments(
&self,
fn_name: &str,
arg_values: &mut [Dynamic],
) -> Option<Dynamic> {
state
.engine
self.engine
.call_native_fn(
&mut Default::default(),
&mut Default::default(),
state.lib,
self.lib,
fn_name,
calc_fn_hash(fn_name, arg_values.len()),
&mut arg_values.iter_mut().collect::<StaticVec<_>>(),
@ -155,6 +142,19 @@ fn call_fn_with_constant_arguments(
.ok()
.map(|(v, _)| v)
}
// Has a system function a Rust-native override?
pub fn has_native_fn(&self, hash_script: u64, arg_types: &[TypeId]) -> bool {
let hash_params = calc_fn_params_hash(arg_types.iter().cloned());
let hash = combine_hashes(hash_script, hash_params);
// First check registered functions
self.engine.global_namespace.contains_fn(hash)
// Then check packages
|| self.engine.global_modules.iter().any(|m| m.contains_fn(hash))
// Then check sub-modules
|| self.engine.global_sub_modules.values().any(|m| m.contains_qualified_fn(hash))
}
}
/// Optimize a block of [statements][Stmt].
fn optimize_stmt_block(
@ -944,32 +944,35 @@ fn optimize_expr(expr: &mut Expr, state: &mut OptimizerState, _chaining: bool) {
Expr::FnCall(x, pos)
if !x.is_qualified() // Non-qualified
&& state.optimization_level == OptimizationLevel::Simple // simple optimizations
&& x.args.len() == 2 // binary call
&& x.args.iter().all(Expr::is_constant) // all arguments are constants
//&& !is_valid_identifier(x.name.chars()) // cannot be scripted
=> {
let mut arg_values: StaticVec<_> = x.args.iter().map(|e| match e {
let arg_values = &mut x.args.iter().map(|e| match e {
Expr::Stack(slot, _) => x.constants[*slot].clone(),
_ => e.get_literal_value().unwrap()
}).collect();
}).collect::<StaticVec<_>>();
let arg_types: StaticVec<_> = arg_values.iter().map(Dynamic::type_id).collect();
// Search for overloaded operators (can override built-in).
if !has_native_fn(state, x.hashes.native, arg_types.as_ref()) {
if let Some(mut result) = get_builtin_binary_op_fn(x.name.as_ref(), &arg_values[0], &arg_values[1])
let result = match x.name.as_str() {
KEYWORD_TYPE_OF if arg_values.len() == 1 => Some(state.engine.map_type_name(arg_values[0].type_name()).into()),
KEYWORD_IS_SHARED if arg_values.len() == 1 => Some(Dynamic::FALSE),
// Overloaded operators can override built-in.
_ if x.args.len() == 2 && !state.has_native_fn(x.hashes.native, arg_types.as_ref()) => {
get_builtin_binary_op_fn(x.name.as_ref(), &arg_values[0], &arg_values[1])
.and_then(|f| {
let ctx = (state.engine, x.name.as_ref(), state.lib).into();
let (first, second) = arg_values.split_first_mut().unwrap();
(f)(ctx, &mut [ first, &mut second[0] ]).ok()
})
.map(Expr::from)
{
state.set_dirty();
result.set_position(*pos);
*expr = result;
return;
}
_ => None
};
if let Some(result) = result {
state.set_dirty();
*expr = Expr::from_dynamic(result, *pos);
return;
}
x.args.iter_mut().for_each(|a| optimize_expr(a, state, false));
@ -997,30 +1000,20 @@ fn optimize_expr(expr: &mut Expr, state: &mut OptimizerState, _chaining: bool) {
let has_script_fn = false;
if !has_script_fn {
let mut arg_values: StaticVec<_> = x.args.iter().map(|e| match e {
let arg_values = &mut x.args.iter().map(|e| match e {
Expr::Stack(slot, _) => x.constants[*slot].clone(),
_ => e.get_literal_value().unwrap()
}).collect();
}).collect::<StaticVec<_>>();
// Save the typename of the first argument if it is `type_of()`
// This is to avoid `call_args` being passed into the closure
let arg_for_type_of = if x.name == KEYWORD_TYPE_OF && arg_values.len() == 1 {
state.engine.map_type_name(arg_values[0].type_name())
} else {
""
let result = match x.name.as_str() {
KEYWORD_TYPE_OF if arg_values.len() == 1 => Some(state.engine.map_type_name(arg_values[0].type_name()).into()),
KEYWORD_IS_SHARED if arg_values.len() == 1 => Some(Dynamic::FALSE),
_ => state.call_fn_with_constant_arguments(x.name.as_ref(), arg_values)
};
if let Some(mut result) = call_fn_with_constant_arguments(&state, x.name.as_ref(), &mut arg_values)
.or_else(|| if !arg_for_type_of.is_empty() {
// Handle `type_of()`
Some(arg_for_type_of.to_string().into())
} else {
None
}).map(Expr::from)
{
if let Some(result) = result {
state.set_dirty();
result.set_position(*pos);
*expr = result;
*expr = Expr::from_dynamic(result, *pos);
return;
}
}
@ -1043,9 +1036,7 @@ fn optimize_expr(expr: &mut Expr, state: &mut OptimizerState, _chaining: bool) {
// constant-name
Expr::Variable(_, pos, x) if x.1.is_none() && state.find_constant(&x.2).is_some() => {
// Replace constant with value
let pos = *pos;
*expr = Expr::from(state.find_constant(&x.2).unwrap().clone());
expr.set_position(pos);
*expr = Expr::from_dynamic(state.find_constant(&x.2).unwrap().clone(), *pos);
state.set_dirty();
}