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Eliminate duplication code of building panic langcall during codegen #96474

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merged 2 commits into from
Apr 29, 2022
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Eliminate duplication code of building panic langcall during codegen #96474

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d735aa6
Eliminate duplication of building panic langcall in codegen
SparrowLii Apr 27, 2022
cf00142
use tcx.require_lang_item() instead
SparrowLii Apr 28, 2022
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19 changes: 9 additions & 10 deletions compiler/rustc_codegen_ssa/src/common.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,15 +2,13 @@

use rustc_errors::struct_span_err;
use rustc_hir as hir;
use rustc_hir::def_id::DefId;
use rustc_hir::LangItem;
use rustc_middle::mir::interpret::ConstValue;
use rustc_middle::ty::{self, layout::TyAndLayout, Ty, TyCtxt};
use rustc_session::Session;
use rustc_span::Span;

use crate::base;
use crate::traits::BuilderMethods;
use crate::traits::*;

pub enum IntPredicate {
Expand Down Expand Up @@ -118,14 +116,15 @@ mod temp_stable_hash_impls {
}
}

pub fn langcall(tcx: TyCtxt<'_>, span: Option<Span>, msg: &str, li: LangItem) -> DefId {
tcx.lang_items().require(li).unwrap_or_else(|s| {
let msg = format!("{} {}", msg, s);
match span {
Some(span) => tcx.sess.span_fatal(span, &msg),
None => tcx.sess.fatal(&msg),
}
})
pub fn build_langcall<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
bx: &Bx,
span: Option<Span>,
li: LangItem,
) -> (Bx::FnAbiOfResult, Bx::Value) {
let tcx = bx.tcx();
let def_id = tcx.require_lang_item(li, span);
let instance = ty::Instance::mono(tcx, def_id);
(bx.fn_abi_of_instance(instance, ty::List::empty()), bx.get_fn_addr(instance))
}

// To avoid UB from LLVM, these two functions mask RHS with an
Expand Down
24 changes: 5 additions & 19 deletions compiler/rustc_codegen_ssa/src/mir/block.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -489,11 +489,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
}
};

// Obtain the panic entry point.
let def_id = common::langcall(bx.tcx(), Some(span), "", lang_item);
let instance = ty::Instance::mono(bx.tcx(), def_id);
let fn_abi = bx.fn_abi_of_instance(instance, ty::List::empty());
let llfn = bx.get_fn_addr(instance);
let (fn_abi, llfn) = common::build_langcall(&bx, Some(span), lang_item);

// Codegen the actual panic invoke/call.
helper.do_call(self, &mut bx, fn_abi, llfn, &args, None, cleanup);
Expand All @@ -509,10 +505,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
self.set_debug_loc(&mut bx, terminator.source_info);

// Obtain the panic entry point.
let def_id = common::langcall(bx.tcx(), Some(span), "", LangItem::PanicNoUnwind);
let instance = ty::Instance::mono(bx.tcx(), def_id);
let fn_abi = bx.fn_abi_of_instance(instance, ty::List::empty());
let llfn = bx.get_fn_addr(instance);
let (fn_abi, llfn) = common::build_langcall(&bx, Some(span), LangItem::PanicNoUnwind);

// Codegen the actual panic invoke/call.
helper.do_call(self, &mut bx, fn_abi, llfn, &[], None, None);
Expand Down Expand Up @@ -573,12 +566,8 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
let location = self.get_caller_location(bx, source_info).immediate();

// Obtain the panic entry point.
// FIXME: dedup this with `codegen_assert_terminator` above.
let def_id =
common::langcall(bx.tcx(), Some(source_info.span), "", LangItem::Panic);
let instance = ty::Instance::mono(bx.tcx(), def_id);
let fn_abi = bx.fn_abi_of_instance(instance, ty::List::empty());
let llfn = bx.get_fn_addr(instance);
let (fn_abi, llfn) =
common::build_langcall(bx, Some(source_info.span), LangItem::Panic);

// Codegen the actual panic invoke/call.
helper.do_call(
Expand Down Expand Up @@ -1440,10 +1429,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
let llretty = self.landing_pad_type();
bx.cleanup_landing_pad(llretty, llpersonality);

let def_id = common::langcall(bx.tcx(), None, "", LangItem::PanicNoUnwind);
let instance = ty::Instance::mono(bx.tcx(), def_id);
let fn_abi = bx.fn_abi_of_instance(instance, ty::List::empty());
let fn_ptr = bx.get_fn_addr(instance);
let (fn_abi, fn_ptr) = common::build_langcall(&bx, None, LangItem::PanicNoUnwind);
let fn_ty = bx.fn_decl_backend_type(&fn_abi);

let llret = bx.call(fn_ty, fn_ptr, &[], None);
Expand Down