src/abi/comments.rs

   1 use std::borrow::Cow;
   2
   3 use rustc_middle::mir;
   4
   5 use cranelift_codegen::entity::EntityRef;
   6
   7 use crate::abi::pass_mode::*;
   8 use crate::prelude::*;
   9
  10 pub(super) fn add_args_header_comment(fx: &mut FunctionCx<'_, '_, impl Backend>) {
  11     fx.add_global_comment(format!(
  12         "kind  loc.idx   param    pass mode                            ty"
  13     ));
  14 }
  15
  16 pub(super) fn add_arg_comment<'tcx>(
  17     fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
  18     kind: &str,
  19     local: Option<mir::Local>,
  20     local_field: Option<usize>,
  21     params: EmptySinglePair<Value>,
  22     pass_mode: PassMode,
  23     ty: Ty<'tcx>,
  24 ) {
  25     let local = if let Some(local) = local {
  26         Cow::Owned(format!("{:?}", local))
  27     } else {
  28         Cow::Borrowed("???")
  29     };
  30     let local_field = if let Some(local_field) = local_field {
  31         Cow::Owned(format!(".{}", local_field))
  32     } else {
  33         Cow::Borrowed("")
  34     };
  35
  36     let params = match params {
  37         Empty => Cow::Borrowed("-"),
  38         Single(param) => Cow::Owned(format!("= {:?}", param)),
  39         Pair(param_a, param_b) => Cow::Owned(format!("= {:?}, {:?}", param_a, param_b)),
  40     };
  41
  42     let pass_mode = format!("{:?}", pass_mode);
  43     fx.add_global_comment(format!(
  44         "{kind:5}{local:>3}{local_field:<5} {params:10} {pass_mode:36} {ty:?}",
  45         kind = kind,
  46         local = local,
  47         local_field = local_field,
  48         params = params,
  49         pass_mode = pass_mode,
  50         ty = ty,
  51     ));
  52 }
  53
  54 pub(super) fn add_locals_header_comment(fx: &mut FunctionCx<'_, '_, impl Backend>) {
  55     fx.add_global_comment(String::new());
  56     fx.add_global_comment(format!(
  57         "kind  local ty                              size align (abi,pref)"
  58     ));
  59 }
  60
  61 pub(super) fn add_local_place_comments<'tcx>(
  62     fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
  63     place: CPlace<'tcx>,
  64     local: Local,
  65 ) {
  66     let TyAndLayout { ty, layout } = place.layout();
  67     let rustc_target::abi::Layout {
  68         size,
  69         align,
  70         abi: _,
  71         variants: _,
  72         fields: _,
  73         largest_niche: _,
  74     } = layout;
  75
  76     let (kind, extra) = match *place.inner() {
  77         CPlaceInner::Var(place_local, var) => {
  78             assert_eq!(local, place_local);
  79             ("ssa", Cow::Owned(format!(",var={}", var.index())))
  80         }
  81         CPlaceInner::VarPair(place_local, var1, var2) => {
  82             assert_eq!(local, place_local);
  83             ("ssa", Cow::Owned(format!(",var=({}, {})", var1.index(), var2.index())))
  84         }
  85         CPlaceInner::VarLane(_local, _var, _lane) => unreachable!(),
  86         CPlaceInner::Addr(ptr, meta) => {
  87             let meta = if let Some(meta) = meta {
  88                 Cow::Owned(format!(",meta={}", meta))
  89             } else {
  90                 Cow::Borrowed("")
  91             };
  92             match ptr.base_and_offset() {
  93                 (crate::pointer::PointerBase::Addr(addr), offset) => {
  94                     ("reuse", format!("storage={}{}{}", addr, offset, meta).into())
  95                 }
  96                 (crate::pointer::PointerBase::Stack(stack_slot), offset) => {
  97                     ("stack", format!("storage={}{}{}", stack_slot, offset, meta).into())
  98                 }
  99                 (crate::pointer::PointerBase::Dangling(align), offset) => {
 100                     ("zst", format!("align={},offset={}", align.bytes(), offset).into())
 101                 }
 102             }
 103         }
 104     };
 105
 106     fx.add_global_comment(format!(
 107         "{:<5} {:5} {:30} {:4}b {}, {}{}{}",
 108         kind,
 109         format!("{:?}", local),
 110         format!("{:?}", ty),
 111         size.bytes(),
 112         align.abi.bytes(),
 113         align.pref.bytes(),
 114         if extra.is_empty() { "" } else { "              " },
 115         extra,
 116     ));
 117 }