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|
//! Annotate the clif ir with comments describing how arguments are passed into the current function
//! and where all locals are stored.
use std::borrow::Cow;
use rustc_middle::mir;
use rustc_target::abi::call::PassMode;
use cranelift_codegen::entity::EntityRef;
use crate::prelude::*;
pub(super) fn add_args_header_comment(fx: &mut FunctionCx<'_, '_, '_>) {
if fx.clif_comments.enabled() {
fx.add_global_comment(
"kind loc.idx param pass mode ty".to_string(),
);
}
}
pub(super) fn add_arg_comment<'tcx>(
fx: &mut FunctionCx<'_, '_, 'tcx>,
kind: &str,
local: Option<mir::Local>,
local_field: Option<usize>,
params: &[Value],
arg_abi_mode: &PassMode,
arg_layout: TyAndLayout<'tcx>,
) {
if !fx.clif_comments.enabled() {
return;
}
let local = if let Some(local) = local {
Cow::Owned(format!("{:?}", local))
} else {
Cow::Borrowed("???")
};
let local_field = if let Some(local_field) = local_field {
Cow::Owned(format!(".{}", local_field))
} else {
Cow::Borrowed("")
};
let params = match params {
[] => Cow::Borrowed("-"),
[param] => Cow::Owned(format!("= {:?}", param)),
[param_a, param_b] => Cow::Owned(format!("= {:?},{:?}", param_a, param_b)),
params => Cow::Owned(format!(
"= {}",
params.iter().map(ToString::to_string).collect::<Vec<_>>().join(",")
)),
};
let pass_mode = format!("{:?}", arg_abi_mode);
fx.add_global_comment(format!(
"{kind:5}{local:>3}{local_field:<5} {params:10} {pass_mode:36} {ty:?}",
kind = kind,
local = local,
local_field = local_field,
params = params,
pass_mode = pass_mode,
ty = arg_layout.ty,
));
}
pub(super) fn add_locals_header_comment(fx: &mut FunctionCx<'_, '_, '_>) {
if fx.clif_comments.enabled() {
fx.add_global_comment(String::new());
fx.add_global_comment(
"kind local ty size align (abi,pref)".to_string(),
);
}
}
pub(super) fn add_local_place_comments<'tcx>(
fx: &mut FunctionCx<'_, '_, 'tcx>,
place: CPlace<'tcx>,
local: Local,
) {
if !fx.clif_comments.enabled() {
return;
}
let TyAndLayout { ty, layout } = place.layout();
let rustc_target::abi::LayoutS {
size,
align,
abi: _,
variants: _,
fields: _,
largest_niche: _,
} = layout.0.0;
let (kind, extra) = match *place.inner() {
CPlaceInner::Var(place_local, var) => {
assert_eq!(local, place_local);
("ssa", Cow::Owned(format!(",var={}", var.index())))
}
CPlaceInner::VarPair(place_local, var1, var2) => {
assert_eq!(local, place_local);
("ssa", Cow::Owned(format!("var=({}, {})", var1.index(), var2.index())))
}
CPlaceInner::VarLane(_local, _var, _lane) => unreachable!(),
CPlaceInner::Addr(ptr, meta) => {
let meta = if let Some(meta) = meta {
Cow::Owned(format!("meta={}", meta))
} else {
Cow::Borrowed("")
};
match ptr.debug_base_and_offset() {
(crate::pointer::PointerBase::Addr(addr), offset) => {
("reuse", format!("storage={}{}{}", addr, offset, meta).into())
}
(crate::pointer::PointerBase::Stack(stack_slot), offset) => {
("stack", format!("storage={}{}{}", stack_slot, offset, meta).into())
}
(crate::pointer::PointerBase::Dangling(align), offset) => {
("zst", format!("align={},offset={}", align.bytes(), offset).into())
}
}
}
};
fx.add_global_comment(format!(
"{:<5} {:5} {:30} {:4}b {}, {}{}{}",
kind,
format!("{:?}", local),
format!("{:?}", ty),
size.bytes(),
align.abi.bytes(),
align.pref.bytes(),
if extra.is_empty() { "" } else { " " },
extra,
));
}
|
