Couple of clif ir printing improvements around abi handling

src/abi/mod.rs

@@ -562,6 +562,11 @@ pub(crate) fn codegen_terminator_call<'tcx>(
             adjust_call_for_c_variadic(fx, &fn_abi, source_info, func_ref, &mut call_args);
         }
 
+        if fx.clif_comments.enabled() {
+            let nop_inst = fx.bcx.ins().nop();
+            fx.add_comment(nop_inst, format!("abi:{:?}", fn_abi));
+        }
+
         match func_ref {
             CallTarget::Direct(func_ref) => fx.bcx.ins().call(func_ref, &call_args),
             CallTarget::Indirect(sig, func_ptr) => {

src/base.rs

@@ -101,12 +101,12 @@ pub(crate) fn codegen_fn<'tcx>(
     let block_map: IndexVec<BasicBlock, Block> =
         (0..mir.basic_blocks.len()).map(|_| bcx.create_block()).collect();
 
+    let fn_abi = RevealAllLayoutCx(tcx).fn_abi_of_instance(instance, ty::List::empty());
+
     // Make FunctionCx
     let target_config = module.target_config();
     let pointer_type = target_config.pointer_type();
-    let clif_comments = crate::pretty_clif::CommentWriter::new(tcx, instance);
-
-    let fn_abi = RevealAllLayoutCx(tcx).fn_abi_of_instance(instance, ty::List::empty());
+    let clif_comments = crate::pretty_clif::CommentWriter::new(tcx, instance, fn_abi);
 
     let func_debug_cx = if let Some(debug_context) = &mut cx.debug_context {
         Some(debug_context.define_function(tcx, type_dbg, instance, fn_abi, &symbol_name, mir.span))

src/pretty_clif.rs

@@ -62,9 +62,9 @@ use cranelift_codegen::entity::SecondaryMap;
 use cranelift_codegen::ir::Fact;
 use cranelift_codegen::ir::entities::AnyEntity;
 use cranelift_codegen::write::{FuncWriter, PlainWriter};
-use rustc_middle::ty::layout::FnAbiOf;
 use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_session::config::{OutputFilenames, OutputType};
+use rustc_target::abi::call::FnAbi;
 
 use crate::prelude::*;
 
@@ -76,17 +76,18 @@ pub(crate) struct CommentWriter {
 }
 
 impl CommentWriter {
-    pub(crate) fn new<'tcx>(tcx: TyCtxt<'tcx>, instance: Instance<'tcx>) -> Self {
+    pub(crate) fn new<'tcx>(
+        tcx: TyCtxt<'tcx>,
+        instance: Instance<'tcx>,
+        fn_abi: &'tcx FnAbi<'tcx, Ty<'tcx>>,
+    ) -> Self {
         let enabled = should_write_ir(tcx);
         let global_comments = if enabled {
             with_no_trimmed_paths!({
                 vec![
                     format!("symbol {}", tcx.symbol_name(instance).name),
                     format!("instance {:?}", instance),
-                    format!(
-                        "abi {:?}",
-                        RevealAllLayoutCx(tcx).fn_abi_of_instance(instance, ty::List::empty())
-                    ),
+                    format!("abi {:?}", fn_abi),
                     String::new(),
                 ]
             })