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remove unneeded code

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Folkert 2020-11-07 00:28:44 +01:00
parent e27527b552
commit 9b949912d7
1 changed files with 88 additions and 98 deletions
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42
compiler/mono/src/ir.rs
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@ -1504,14 +1504,9 @@ fn specialize_external<'a>(
pattern_symbols
};
let spec_proc =
let (proc_args, opt_closure_layout, ret_layout) =
build_specialized_proc_from_var(env, layout_cache, proc_name, pattern_symbols, fn_var)?;
match spec_proc {
SpecializedLayout::EmptyClosure(_arg_layouts, _ret_layout) => {
panic!("I don't think this should happen if things went well")
}
SpecializedLayout::Normal(proc_args, opt_closure_layout, ret_layout) => {
let mut specialized_body = from_can(env, fn_var, body, procs, layout_cache);
// unpack the closure symbols, if any
if let CapturedSymbols::Captured(captured) = captured_symbols {
@ -1540,8 +1535,7 @@ fn specialize_external<'a>(
// layout is cached anyway, re-using the one found above leads to
// issues (combining by-ref and by-move in pattern match
let layout = layout_cache.from_var(env.arena, *variable, env.subs)?;
specialized_body =
Stmt::Let(*symbol, expr, layout, env.arena.alloc(specialized_body));
specialized_body = Stmt::Let(*symbol, expr, layout, env.arena.alloc(specialized_body));
}
}
@ -1591,17 +1585,12 @@ fn specialize_external<'a>(
Ok(proc)
}
}
}
enum SpecializedLayout<'a> {
Normal(
type SpecializedLayout<'a> = (
&'a [(Layout<'a>, Symbol)],
Option<ClosureLayout<'a>>,
Layout<'a>,
),
EmptyClosure(&'a [Layout<'a>], Layout<'a>),
}
);
#[allow(clippy::type_complexity)]
fn build_specialized_proc_from_var<'a>(
@ -1727,11 +1716,8 @@ fn build_specialized_proc<'a>(
opt_closure_layout: Option<ClosureLayout<'a>>,
ret_layout: Layout<'a>,
) -> Result<SpecializedLayout<'a>, LayoutProblem> {
use SpecializedLayout::*;
let mut proc_args = Vec::with_capacity_in(pattern_layouts.len(), arena);
let pattern_layouts_slice = pattern_layouts.clone().into_bump_slice();
let pattern_layouts_len = pattern_layouts.len();
for (arg_layout, arg_name) in pattern_layouts.into_iter().zip(pattern_symbols.iter()) {
@ -1770,7 +1756,7 @@ fn build_specialized_proc<'a>(
let proc_args = proc_args.into_bump_slice();
Ok(Normal(proc_args, Some(layout), ret_layout))
Ok((proc_args, Some(layout), ret_layout))
}
Some(layout) => {
// else if there is a closure layout, we're building the `f_closure` value
@ -1785,7 +1771,7 @@ fn build_specialized_proc<'a>(
let closure_layout =
Layout::Struct(arena.alloc([function_ptr_layout, closure_data_layout]));
Ok(Normal(&[], None, closure_layout))
Ok((&[], None, closure_layout))
}
None => {
// else we're making a normal function, no closure problems to worry about
@ -1794,14 +1780,18 @@ fn build_specialized_proc<'a>(
// make sure there is not arg_closure argument without a closure layout
debug_assert!(pattern_symbols.last() != Some(&Symbol::ARG_CLOSURE));
match pattern_layouts_len - pattern_symbols.len() {
0 => {
let diff = pattern_layouts_len - pattern_symbols.len();
if diff == 0 {
let proc_args = proc_args.into_bump_slice();
Ok(Normal(proc_args, None, ret_layout))
}
1 => Ok(EmptyClosure(pattern_layouts_slice, ret_layout)),
_ => panic!(),
Ok((proc_args, None, ret_layout))
} else if diff > 0 {
// so far, the problem when hitting this branch was always somewhere else
// I think this branch should not be reachable in a bugfree compiler
panic!("more arguments (according to the layout) than argument symbols")
} else {
panic!("more argument symbols than arguments (according to the layout)")
}
}
}