Fix inline asm codegen for empty template

[rust.git] / src / main_shim.rs

diff --git a/src/main_shim.rs b/src/main_shim.rs
index 4beb6c65a7791e15f7e89c6fb18cb44a5e65ec9b..2f71a70a4494615529fd859c4d86c3178a5fe0c0 100644 (file)
--- a/src/main_shim.rs
+++ b/src/main_shim.rs
@@ -1,6 +1,8 @@
-use cranelift_codegen::binemit::{NullStackMapSink, NullTrapSink};
 use rustc_hir::LangItem;
+use rustc_middle::ty::subst::GenericArg;
+use rustc_middle::ty::AssocKind;
 use rustc_session::config::EntryFnType;
+use rustc_span::symbol::Ident;
 
 use crate::prelude::*;
 
@@ -11,10 +13,11 @@ pub(crate) fn maybe_create_entry_wrapper(
     module: &mut impl Module,
     unwind_context: &mut UnwindContext,
     is_jit: bool,
+    is_primary_cgu: bool,
 ) {
-    let (main_def_id, is_main_fn) = match tcx.entry_fn(LOCAL_CRATE) {
+    let (main_def_id, is_main_fn) = match tcx.entry_fn(()) {
         Some((def_id, entry_ty)) => (
-            def_id.to_def_id(),
+            def_id,
             match entry_ty {
                 EntryFnType::Main => true,
                 EntryFnType::Start => false,
@@ -23,8 +26,12 @@ pub(crate) fn maybe_create_entry_wrapper(
         None => return,
     };
 
-    let instance = Instance::mono(tcx, main_def_id).polymorphize(tcx);
-    if !is_jit && module.get_name(&*tcx.symbol_name(instance).name).is_none() {
+    if main_def_id.is_local() {
+        let instance = Instance::mono(tcx, main_def_id).polymorphize(tcx);
+        if !is_jit && module.get_name(&*tcx.symbol_name(instance).name).is_none() {
+            return;
+        }
+    } else if !is_primary_cgu {
         return;
     }
 
@@ -44,7 +51,10 @@ fn create_entry_fn(
         // late-bound regions, since late-bound
         // regions must appear in the argument
         // listing.
-        let main_ret_ty = tcx.erase_regions(main_ret_ty.no_bound_vars().unwrap());
+        let main_ret_ty = tcx.normalize_erasing_regions(
+            ty::ParamEnv::reveal_all(),
+            main_ret_ty.no_bound_vars().unwrap(),
+        );
 
         let cmain_sig = Signature {
             params: vec![
@@ -59,9 +69,9 @@ fn create_entry_fn(
 
         let instance = Instance::mono(tcx, rust_main_def_id).polymorphize(tcx);
 
-        let main_name = tcx.symbol_name(instance).name.to_string();
+        let main_name = tcx.symbol_name(instance).name;
         let main_sig = get_function_sig(tcx, m.isa().triple(), instance);
-        let main_func_id = m.declare_function(&main_name, Linkage::Import, &main_sig).unwrap();
+        let main_func_id = m.declare_function(main_name, Linkage::Import, &main_sig).unwrap();
 
         let mut ctx = Context::new();
         ctx.func = Function::with_name_signature(ExternalName::user(0, 0), cmain_sig);
@@ -79,8 +89,43 @@ fn create_entry_fn(
             let result = if is_main_fn && ignore_lang_start_wrapper {
                 // regular main fn, but ignoring #[lang = "start"] as we are running in the jit
                 // FIXME set program arguments somehow
-                bcx.ins().call(main_func_ref, &[]);
-                bcx.ins().iconst(m.target_config().pointer_type(), 0)
+                let call_inst = bcx.ins().call(main_func_ref, &[]);
+                let call_results = bcx.func.dfg.inst_results(call_inst).to_owned();
+
+                let termination_trait = tcx.require_lang_item(LangItem::Termination, None);
+                let report = tcx
+                    .associated_items(termination_trait)
+                    .find_by_name_and_kind(
+                        tcx,
+                        Ident::from_str("report"),
+                        AssocKind::Fn,
+                        termination_trait,
+                    )
+                    .unwrap();
+                let report = Instance::resolve(
+                    tcx,
+                    ParamEnv::reveal_all(),
+                    report.def_id,
+                    tcx.mk_substs([GenericArg::from(main_ret_ty)].iter()),
+                )
+                .unwrap()
+                .unwrap();
+
+                let report_name = tcx.symbol_name(report).name;
+                let report_sig = get_function_sig(tcx, m.isa().triple(), report);
+                let report_func_id =
+                    m.declare_function(report_name, Linkage::Import, &report_sig).unwrap();
+                let report_func_ref = m.declare_func_in_func(report_func_id, &mut bcx.func);
+
+                // FIXME do proper abi handling instead of expecting the pass mode to be identical
+                // for returns and arguments.
+                let report_call_inst = bcx.ins().call(report_func_ref, &call_results);
+                let res = bcx.func.dfg.inst_results(report_call_inst)[0];
+                match m.target_config().pointer_type() {
+                    types::I32 => res,
+                    types::I64 => bcx.ins().sextend(types::I64, res),
+                    _ => unimplemented!("16bit systems are not yet supported"),
+                }
             } else if is_main_fn {
                 let start_def_id = tcx.require_lang_item(LangItem::Start, None);
                 let start_instance = Instance::resolve(
@@ -109,8 +154,7 @@ fn create_entry_fn(
             bcx.seal_all_blocks();
             bcx.finalize();
         }
-        m.define_function(cmain_func_id, &mut ctx, &mut NullTrapSink {}, &mut NullStackMapSink {})
-            .unwrap();
+        m.define_function(cmain_func_id, &mut ctx).unwrap();
         unwind_context.add_function(cmain_func_id, &ctx, m.isa());
     }
 }