+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::*;
/// Create the `main` function which will initialize the rust runtime and call
/// users main function.
-pub fn maybe_create_entry_wrapper<'a, 'tcx: 'a>(
- tcx: TyCtxt<'a, 'tcx, 'tcx>,
- module: &mut Module<impl Backend + 'static>,
+pub(crate) fn maybe_create_entry_wrapper(
+ tcx: TyCtxt<'_>,
+ module: &mut impl Module,
+ unwind_context: &mut UnwindContext,
+ is_jit: bool,
+ is_primary_cgu: bool,
) {
- use crate::rustc::middle::lang_items::StartFnLangItem;
- use crate::rustc::session::config::EntryFnType;
-
- let (main_def_id, use_start_lang_item) = match *tcx.sess.entry_fn.borrow() {
- Some((id, _, entry_ty)) => (
- tcx.hir.local_def_id(id),
+ let (main_def_id, is_main_fn) = match tcx.entry_fn(()) {
+ Some((def_id, entry_ty)) => (
+ def_id,
match entry_ty {
EntryFnType::Main => true,
EntryFnType::Start => false,
None => return,
};
- create_entry_fn(tcx, module, main_def_id, use_start_lang_item);;
+ 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;
+ }
+
+ create_entry_fn(tcx, module, unwind_context, main_def_id, is_jit, is_main_fn);
- fn create_entry_fn<'a, 'tcx: 'a>(
- tcx: TyCtxt<'a, 'tcx, 'tcx>,
- m: &mut Module<impl Backend + 'static>,
+ fn create_entry_fn(
+ tcx: TyCtxt<'_>,
+ m: &mut impl Module,
+ unwind_context: &mut UnwindContext,
rust_main_def_id: DefId,
- use_start_lang_item: bool,
+ ignore_lang_start_wrapper: bool,
+ is_main_fn: bool,
) {
let main_ret_ty = tcx.fn_sig(rust_main_def_id).output();
// Given that `main()` has no arguments,
// 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![
AbiParam::new(m.target_config().pointer_type()),
],
returns: vec![AbiParam::new(m.target_config().pointer_type() /*isize*/)],
- call_conv: CallConv::SystemV,
+ call_conv: CallConv::triple_default(m.isa().triple()),
};
- let cmain_func_id = m
- .declare_function("main", Linkage::Export, &cmain_sig)
- .unwrap();
-
- let instance = Instance::mono(tcx, rust_main_def_id);
+ let cmain_func_id = m.declare_function("main", Linkage::Export, &cmain_sig).unwrap();
- let (main_name, main_sig) = get_function_name_and_sig(tcx, instance);
+ let instance = Instance::mono(tcx, rust_main_def_id).polymorphize(tcx);
- let main_func_id = m
- .declare_function(&main_name, Linkage::Import, &main_sig)
- .unwrap();
+ 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 mut ctx = Context::new();
- ctx.func = Function::with_name_signature(ExternalName::user(0, 0), cmain_sig.clone());
+ ctx.func = Function::with_name_signature(ExternalName::user(0, 0), cmain_sig);
{
let mut func_ctx = FunctionBuilderContext::new();
- let mut bcx: FunctionBuilder = FunctionBuilder::new(&mut ctx.func, &mut func_ctx);
+ let mut bcx = FunctionBuilder::new(&mut ctx.func, &mut func_ctx);
- let ebb = bcx.create_ebb();
- bcx.switch_to_block(ebb);
- let arg_argc = bcx.append_ebb_param(ebb, m.target_config().pointer_type());
- let arg_argv = bcx.append_ebb_param(ebb, m.target_config().pointer_type());
+ let block = bcx.create_block();
+ bcx.switch_to_block(block);
+ let arg_argc = bcx.append_block_param(block, m.target_config().pointer_type());
+ let arg_argv = bcx.append_block_param(block, m.target_config().pointer_type());
let main_func_ref = m.declare_func_in_func(main_func_id, &mut bcx.func);
- let call_inst = if use_start_lang_item {
- let start_def_id = tcx.require_lang_item(StartFnLangItem);
+ 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
+ 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()
+ .polymorphize(tcx);
+
+ 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(
tcx,
ParamEnv::reveal_all(),
start_def_id,
tcx.intern_substs(&[main_ret_ty.into()]),
)
- .unwrap();
-
- let (start_name, start_sig) = get_function_name_and_sig(tcx, start_instance);
- let start_func_id = m
- .declare_function(&start_name, Linkage::Import, &start_sig)
- .unwrap();
+ .unwrap()
+ .unwrap()
+ .polymorphize(tcx);
+ let start_func_id = import_function(tcx, m, start_instance);
let main_val = bcx.ins().func_addr(m.target_config().pointer_type(), main_func_ref);
let func_ref = m.declare_func_in_func(start_func_id, &mut bcx.func);
- bcx.ins().call(func_ref, &[main_val, arg_argc, arg_argv])
+ let call_inst = bcx.ins().call(func_ref, &[main_val, arg_argc, arg_argv]);
+ bcx.inst_results(call_inst)[0]
} else {
// using user-defined start fn
- bcx.ins().call(main_func_ref, &[arg_argc, arg_argv])
+ let call_inst = bcx.ins().call(main_func_ref, &[arg_argc, arg_argv]);
+ bcx.inst_results(call_inst)[0]
};
- let result = bcx.inst_results(call_inst)[0];
bcx.ins().return_(&[result]);
bcx.seal_all_blocks();
bcx.finalize();
}
m.define_function(cmain_func_id, &mut ctx).unwrap();
+ unwind_context.add_function(cmain_func_id, &ctx, m.isa());
}
}
projects / rust.git / blobdiff