805 lines
28 KiB
Rust
805 lines
28 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//!
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//
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// Handles translation of callees as well as other call-related
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// things. Callees are a superset of normal rust values and sometimes
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// have different representations. In particular, top-level fn items
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// and methods are represented as just a fn ptr and not a full
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// closure.
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use core::prelude::*;
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use core::iterator::IteratorUtil;
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use back::abi;
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use driver::session;
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use lib;
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use lib::llvm::ValueRef;
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use lib::llvm::llvm;
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use metadata::csearch;
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use middle::trans::base;
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use middle::trans::base::*;
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use middle::trans::build::*;
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use middle::trans::callee;
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use middle::trans::closure;
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use middle::trans::common;
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use middle::trans::common::*;
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use middle::trans::datum::*;
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use middle::trans::datum::Datum;
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use middle::trans::expr;
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use middle::trans::glue;
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use middle::trans::inline;
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use middle::trans::meth;
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use middle::trans::monomorphize;
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use middle::trans::type_of;
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use middle::ty;
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use middle::typeck;
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use util::ppaux::Repr;
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use core::vec;
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use syntax::ast;
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use syntax::ast_map;
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use syntax::visit;
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// Represents a (possibly monomorphized) top-level fn item or method
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// item. Note that this is just the fn-ptr and is not a Rust closure
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// value (which is a pair).
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pub struct FnData {
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llfn: ValueRef,
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}
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pub struct MethodData {
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llfn: ValueRef,
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llself: ValueRef,
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self_ty: ty::t,
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self_mode: ty::SelfMode,
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}
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pub enum CalleeData {
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Closure(Datum),
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Fn(FnData),
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Method(MethodData)
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}
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pub struct Callee {
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bcx: block,
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data: CalleeData
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}
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pub fn trans(bcx: block, expr: @ast::expr) -> Callee {
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let _icx = bcx.insn_ctxt("trans_callee");
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debug!("callee::trans(expr=%s)", expr.repr(bcx.tcx()));
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// pick out special kinds of expressions that can be called:
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match expr.node {
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ast::expr_path(_) => {
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return trans_def(bcx, bcx.def(expr.id), expr);
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}
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_ => {}
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}
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// any other expressions are closures:
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return datum_callee(bcx, expr);
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fn datum_callee(bcx: block, expr: @ast::expr) -> Callee {
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let DatumBlock {bcx, datum} = expr::trans_to_datum(bcx, expr);
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match ty::get(datum.ty).sty {
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ty::ty_bare_fn(*) => {
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let llval = datum.to_appropriate_llval(bcx);
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return Callee {bcx: bcx, data: Fn(FnData {llfn: llval})};
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}
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ty::ty_closure(*) => {
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return Callee {bcx: bcx, data: Closure(datum)};
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}
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_ => {
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bcx.tcx().sess.span_bug(
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expr.span,
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fmt!("Type of callee is neither bare-fn nor closure: %s",
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bcx.ty_to_str(datum.ty)));
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}
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}
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}
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fn fn_callee(bcx: block, fd: FnData) -> Callee {
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return Callee {bcx: bcx, data: Fn(fd)};
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}
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fn trans_def(bcx: block, def: ast::def, ref_expr: @ast::expr) -> Callee {
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match def {
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ast::def_fn(did, _) | ast::def_static_method(did, None, _) => {
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fn_callee(bcx, trans_fn_ref(bcx, did, ref_expr.id))
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}
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ast::def_static_method(impl_did, Some(trait_did), _) => {
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fn_callee(bcx, meth::trans_static_method_callee(bcx, impl_did,
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trait_did,
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ref_expr.id))
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}
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ast::def_variant(tid, vid) => {
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// nullary variants are not callable
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assert!(ty::enum_variant_with_id(bcx.tcx(),
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tid,
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vid).args.len() > 0u);
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fn_callee(bcx, trans_fn_ref(bcx, vid, ref_expr.id))
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}
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ast::def_struct(def_id) => {
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fn_callee(bcx, trans_fn_ref(bcx, def_id, ref_expr.id))
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}
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ast::def_arg(*) |
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ast::def_local(*) |
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ast::def_binding(*) |
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ast::def_upvar(*) |
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ast::def_self(*) => {
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datum_callee(bcx, ref_expr)
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}
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ast::def_mod(*) | ast::def_foreign_mod(*) | ast::def_trait(*) |
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ast::def_const(*) | ast::def_ty(*) | ast::def_prim_ty(*) |
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ast::def_use(*) | ast::def_typaram_binder(*) |
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ast::def_region(*) | ast::def_label(*) | ast::def_ty_param(*) |
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ast::def_self_ty(*) => {
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bcx.tcx().sess.span_bug(
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ref_expr.span,
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fmt!("Cannot translate def %? \
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to a callable thing!", def));
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}
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}
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}
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}
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pub fn trans_fn_ref_to_callee(bcx: block,
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def_id: ast::def_id,
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ref_id: ast::node_id) -> Callee {
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Callee {bcx: bcx,
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data: Fn(trans_fn_ref(bcx, def_id, ref_id))}
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}
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pub fn trans_fn_ref(bcx: block,
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def_id: ast::def_id,
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ref_id: ast::node_id) -> FnData {
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/*!
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*
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* Translates a reference (with id `ref_id`) to the fn/method
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* with id `def_id` into a function pointer. This may require
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* monomorphization or inlining. */
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let _icx = bcx.insn_ctxt("trans_fn_ref");
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let type_params = node_id_type_params(bcx, ref_id);
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let vtables = node_vtables(bcx, ref_id);
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debug!("trans_fn_ref(def_id=%s, ref_id=%?, type_params=%s, vtables=%s)",
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def_id.repr(bcx.tcx()), ref_id, type_params.repr(bcx.tcx()),
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vtables.repr(bcx.tcx()));
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trans_fn_ref_with_vtables(bcx, def_id, ref_id, type_params, vtables)
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}
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pub fn trans_fn_ref_with_vtables_to_callee(
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bcx: block,
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def_id: ast::def_id,
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ref_id: ast::node_id,
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type_params: &[ty::t],
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vtables: Option<typeck::vtable_res>)
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-> Callee {
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Callee {bcx: bcx,
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data: Fn(trans_fn_ref_with_vtables(bcx, def_id, ref_id,
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type_params, vtables))}
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}
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pub fn trans_fn_ref_with_vtables(
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bcx: block, //
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def_id: ast::def_id, // def id of fn
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ref_id: ast::node_id, // node id of use of fn; may be zero if N/A
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type_params: &[ty::t], // values for fn's ty params
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vtables: Option<typeck::vtable_res>)
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-> FnData {
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//!
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//
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// Translates a reference to a fn/method item, monomorphizing and
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// inlining as it goes.
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//
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// # Parameters
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//
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// - `bcx`: the current block where the reference to the fn occurs
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// - `def_id`: def id of the fn or method item being referenced
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// - `ref_id`: node id of the reference to the fn/method, if applicable.
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// This parameter may be zero; but, if so, the resulting value may not
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// have the right type, so it must be cast before being used.
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// - `type_params`: values for each of the fn/method's type parameters
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// - `vtables`: values for each bound on each of the type parameters
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let _icx = bcx.insn_ctxt("trans_fn_ref_with_vtables");
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let ccx = bcx.ccx();
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let tcx = ccx.tcx;
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debug!("trans_fn_ref_with_vtables(bcx=%s, def_id=%s, ref_id=%?, \
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type_params=%s, vtables=%s)",
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bcx.to_str(),
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def_id.repr(bcx.tcx()),
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ref_id,
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type_params.repr(bcx.tcx()),
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vtables.repr(bcx.tcx()));
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assert!(type_params.all(|t| !ty::type_needs_infer(*t)));
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// Polytype of the function item (may have type params)
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let fn_tpt = ty::lookup_item_type(tcx, def_id);
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// Modify the def_id if this is a default method; we want to be
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// monomorphizing the trait's code.
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let (def_id, opt_impl_did) = match tcx.provided_method_sources.find(&def_id) {
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None => (def_id, None),
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Some(source) => (source.method_id, Some(source.impl_id))
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};
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// Check whether this fn has an inlined copy and, if so, redirect
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// def_id to the local id of the inlined copy.
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let def_id = {
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if def_id.crate != ast::local_crate {
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let may_translate = opt_impl_did.is_none();
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inline::maybe_instantiate_inline(ccx, def_id, may_translate)
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} else {
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def_id
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}
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};
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// We must monomorphise if the fn has type parameters, is a rust
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// intrinsic, or is a default method. In particular, if we see an
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// intrinsic that is inlined from a different crate, we want to reemit the
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// intrinsic instead of trying to call it in the other crate.
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let must_monomorphise;
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if type_params.len() > 0 || opt_impl_did.is_some() {
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must_monomorphise = true;
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} else if def_id.crate == ast::local_crate {
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let map_node = session::expect(
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ccx.sess,
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ccx.tcx.items.find(&def_id.node),
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|| fmt!("local item should be in ast map"));
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match *map_node {
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ast_map::node_foreign_item(_, abis, _, _) => {
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must_monomorphise = abis.is_intrinsic()
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}
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_ => {
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must_monomorphise = false;
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}
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}
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} else {
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must_monomorphise = false;
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}
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// Create a monomorphic verison of generic functions
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if must_monomorphise {
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// Should be either intra-crate or inlined.
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assert_eq!(def_id.crate, ast::local_crate);
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let mut (val, must_cast) =
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monomorphize::monomorphic_fn(ccx, def_id, type_params,
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vtables, opt_impl_did, Some(ref_id));
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if must_cast && ref_id != 0 {
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// Monotype of the REFERENCE to the function (type params
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// are subst'd)
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let ref_ty = common::node_id_type(bcx, ref_id);
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val = PointerCast(
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bcx, val, T_ptr(type_of::type_of_fn_from_ty(ccx, ref_ty)));
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}
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return FnData {llfn: val};
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}
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// Find the actual function pointer.
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let val = {
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if def_id.crate == ast::local_crate {
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// Internal reference.
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get_item_val(ccx, def_id.node)
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} else {
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// External reference.
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trans_external_path(ccx, def_id, fn_tpt.ty)
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}
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};
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return FnData {llfn: val};
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}
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// ______________________________________________________________________
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// Translating calls
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pub fn trans_call(in_cx: block,
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call_ex: @ast::expr,
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f: @ast::expr,
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args: CallArgs,
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id: ast::node_id,
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dest: expr::Dest)
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-> block {
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let _icx = in_cx.insn_ctxt("trans_call");
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trans_call_inner(in_cx,
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call_ex.info(),
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expr_ty(in_cx, f),
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node_id_type(in_cx, id),
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|cx| trans(cx, f),
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args,
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dest,
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DontAutorefArg)
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}
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pub fn trans_method_call(in_cx: block,
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call_ex: @ast::expr,
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callee_id: ast::node_id,
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rcvr: @ast::expr,
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args: CallArgs,
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dest: expr::Dest)
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-> block {
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let _icx = in_cx.insn_ctxt("trans_method_call");
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debug!("trans_method_call(call_ex=%s, rcvr=%s)",
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call_ex.repr(in_cx.tcx()),
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rcvr.repr(in_cx.tcx()));
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trans_call_inner(
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in_cx,
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call_ex.info(),
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node_id_type(in_cx, callee_id),
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expr_ty(in_cx, call_ex),
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|cx| {
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match cx.ccx().maps.method_map.find_copy(&call_ex.id) {
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Some(origin) => {
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debug!("origin for %s: %s",
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call_ex.repr(in_cx.tcx()),
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origin.repr(in_cx.tcx()));
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meth::trans_method_callee(cx,
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callee_id,
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rcvr,
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origin)
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}
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None => {
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cx.tcx().sess.span_bug(call_ex.span, "method call expr wasn't in method map")
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}
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}
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},
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args,
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dest,
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DontAutorefArg)
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}
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pub fn trans_lang_call(bcx: block,
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did: ast::def_id,
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args: &[ValueRef],
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dest: expr::Dest)
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-> block {
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let fty = if did.crate == ast::local_crate {
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ty::node_id_to_type(bcx.ccx().tcx, did.node)
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} else {
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csearch::get_type(bcx.ccx().tcx, did).ty
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};
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let rty = ty::ty_fn_ret(fty);
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callee::trans_call_inner(bcx,
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None,
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fty,
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rty,
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|bcx| {
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trans_fn_ref_with_vtables_to_callee(bcx,
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did,
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0,
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[],
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None)
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},
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ArgVals(args),
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dest,
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DontAutorefArg)
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}
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pub fn trans_lang_call_with_type_params(bcx: block,
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did: ast::def_id,
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args: &[ValueRef],
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type_params: &[ty::t],
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dest: expr::Dest)
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-> block {
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let fty;
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if did.crate == ast::local_crate {
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fty = ty::node_id_to_type(bcx.tcx(), did.node);
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} else {
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fty = csearch::get_type(bcx.tcx(), did).ty;
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}
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let rty = ty::ty_fn_ret(fty);
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return callee::trans_call_inner(
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bcx, None, fty, rty,
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|bcx| {
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let callee =
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trans_fn_ref_with_vtables_to_callee(bcx, did, 0,
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type_params,
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None);
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let new_llval;
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match callee.data {
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Fn(fn_data) => {
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let substituted = ty::subst_tps(callee.bcx.tcx(),
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type_params,
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None,
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fty);
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let llfnty = type_of::type_of(callee.bcx.ccx(),
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substituted);
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new_llval = PointerCast(callee.bcx, fn_data.llfn, llfnty);
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}
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_ => fail!()
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}
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Callee { bcx: callee.bcx, data: Fn(FnData { llfn: new_llval }) }
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},
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ArgVals(args), dest, DontAutorefArg);
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}
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pub fn body_contains_ret(body: &ast::blk) -> bool {
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let cx = @mut false;
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visit::visit_block(body, (cx, visit::mk_vt(@visit::Visitor {
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visit_item: |_i, (_cx, _v)| { },
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visit_expr: |e: @ast::expr, (cx, v): (@mut bool, visit::vt<@mut bool>)| {
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if !*cx {
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match e.node {
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ast::expr_ret(_) => *cx = true,
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_ => visit::visit_expr(e, (cx, v)),
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}
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}
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},
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..*visit::default_visitor()
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})));
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*cx
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}
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// See [Note-arg-mode]
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pub fn trans_call_inner(in_cx: block,
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call_info: Option<NodeInfo>,
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fn_expr_ty: ty::t,
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ret_ty: ty::t,
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get_callee: &fn(block) -> Callee,
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args: CallArgs,
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dest: expr::Dest,
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autoref_arg: AutorefArg)
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-> block {
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do base::with_scope(in_cx, call_info, "call") |cx| {
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let ret_in_loop = match args {
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ArgExprs(args) => {
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args.len() > 0u && match vec::last(args).node {
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ast::expr_loop_body(@ast::expr {
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node: ast::expr_fn_block(_, ref body),
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_
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}) => body_contains_ret(body),
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_ => false
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}
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}
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_ => false
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};
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let callee = get_callee(cx);
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let mut bcx = callee.bcx;
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let ccx = cx.ccx();
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let ret_flag = if ret_in_loop {
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let flag = alloca(bcx, T_bool());
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Store(bcx, C_bool(false), flag);
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Some(flag)
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} else {
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None
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};
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let (llfn, llenv) = unsafe {
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match callee.data {
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Fn(d) => {
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|
(d.llfn, llvm::LLVMGetUndef(T_opaque_box_ptr(ccx)))
|
|
}
|
|
Method(d) => {
|
|
// Weird but true: we pass self in the *environment* slot!
|
|
let llself = PointerCast(bcx,
|
|
d.llself,
|
|
T_opaque_box_ptr(ccx));
|
|
(d.llfn, llself)
|
|
}
|
|
Closure(d) => {
|
|
// Closures are represented as (llfn, llclosure) pair:
|
|
// load the requisite values out.
|
|
let pair = d.to_ref_llval(bcx);
|
|
let llfn = GEPi(bcx, pair, [0u, abi::fn_field_code]);
|
|
let llfn = Load(bcx, llfn);
|
|
let llenv = GEPi(bcx, pair, [0u, abi::fn_field_box]);
|
|
let llenv = Load(bcx, llenv);
|
|
(llfn, llenv)
|
|
}
|
|
}
|
|
};
|
|
|
|
let llretslot = trans_ret_slot(bcx, fn_expr_ty, dest);
|
|
|
|
let mut llargs = ~[];
|
|
|
|
if !ty::type_is_immediate(ret_ty) {
|
|
llargs.push(llretslot);
|
|
}
|
|
|
|
llargs.push(llenv);
|
|
bcx = trans_args(bcx, args, fn_expr_ty,
|
|
ret_flag, autoref_arg, &mut llargs);
|
|
|
|
|
|
// Now that the arguments have finished evaluating, we need to revoke
|
|
// the cleanup for the self argument, if it exists
|
|
match callee.data {
|
|
Method(d) if d.self_mode == ty::ByCopy => {
|
|
revoke_clean(bcx, d.llself);
|
|
}
|
|
_ => {}
|
|
}
|
|
|
|
// Uncomment this to debug calls.
|
|
/*
|
|
io::println(fmt!("calling: %s", bcx.val_str(llfn)));
|
|
for llargs.each |llarg| {
|
|
io::println(fmt!("arg: %s", bcx.val_str(*llarg)));
|
|
}
|
|
io::println("---");
|
|
*/
|
|
|
|
// If the block is terminated, then one or more of the args
|
|
// has type _|_. Since that means it diverges, the code for
|
|
// the call itself is unreachable.
|
|
let (llresult, new_bcx) = base::invoke(bcx, llfn, llargs);
|
|
bcx = new_bcx;
|
|
|
|
match dest {
|
|
expr::Ignore => {
|
|
// drop the value if it is not being saved.
|
|
unsafe {
|
|
if llvm::LLVMIsUndef(llretslot) != lib::llvm::True {
|
|
if ty::type_is_nil(ret_ty) {
|
|
// When implementing the for-loop sugar syntax, the
|
|
// type of the for-loop is nil, but the function
|
|
// it's invoking returns a bool. This is a special
|
|
// case to ignore instead of invoking the Store
|
|
// below into a scratch pointer of a mismatched
|
|
// type.
|
|
} else if ty::type_is_immediate(ret_ty) {
|
|
let llscratchptr = alloc_ty(bcx, ret_ty);
|
|
Store(bcx, llresult, llscratchptr);
|
|
bcx = glue::drop_ty(bcx, llscratchptr, ret_ty);
|
|
} else {
|
|
bcx = glue::drop_ty(bcx, llretslot, ret_ty);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
expr::SaveIn(lldest) => {
|
|
// If this is an immediate, store into the result location.
|
|
// (If this was not an immediate, the result will already be
|
|
// directly written into the output slot.)
|
|
if ty::type_is_immediate(ret_ty) {
|
|
Store(bcx, llresult, lldest);
|
|
}
|
|
}
|
|
}
|
|
|
|
if ty::type_is_bot(ret_ty) {
|
|
Unreachable(bcx);
|
|
} else if ret_in_loop {
|
|
let ret_flag_result = bool_to_i1(bcx, Load(bcx, ret_flag.get()));
|
|
bcx = do with_cond(bcx, ret_flag_result) |bcx| {
|
|
{
|
|
let r = (copy bcx.fcx.loop_ret);
|
|
for r.iter().advance |&(flagptr, _)| {
|
|
Store(bcx, C_bool(true), flagptr);
|
|
Store(bcx, C_bool(false), bcx.fcx.llretptr.get());
|
|
}
|
|
}
|
|
base::cleanup_and_leave(bcx, None, Some(bcx.fcx.llreturn));
|
|
Unreachable(bcx);
|
|
bcx
|
|
}
|
|
}
|
|
bcx
|
|
}
|
|
}
|
|
|
|
|
|
pub enum CallArgs<'self> {
|
|
ArgExprs(&'self [@ast::expr]),
|
|
ArgVals(&'self [ValueRef])
|
|
}
|
|
|
|
pub fn trans_ret_slot(bcx: block, fn_ty: ty::t, dest: expr::Dest)
|
|
-> ValueRef {
|
|
let retty = ty::ty_fn_ret(fn_ty);
|
|
|
|
match dest {
|
|
expr::SaveIn(dst) => dst,
|
|
expr::Ignore => {
|
|
if ty::type_is_nil(retty) {
|
|
unsafe {
|
|
llvm::LLVMGetUndef(T_ptr(T_nil()))
|
|
}
|
|
} else {
|
|
alloc_ty(bcx, retty)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn trans_args(cx: block,
|
|
args: CallArgs,
|
|
fn_ty: ty::t,
|
|
ret_flag: Option<ValueRef>,
|
|
autoref_arg: AutorefArg,
|
|
llargs: &mut ~[ValueRef]) -> block
|
|
{
|
|
let _icx = cx.insn_ctxt("trans_args");
|
|
let mut temp_cleanups = ~[];
|
|
let arg_tys = ty::ty_fn_args(fn_ty);
|
|
|
|
let mut bcx = cx;
|
|
|
|
// First we figure out the caller's view of the types of the arguments.
|
|
// This will be needed if this is a generic call, because the callee has
|
|
// to cast her view of the arguments to the caller's view.
|
|
match args {
|
|
ArgExprs(arg_exprs) => {
|
|
let last = arg_exprs.len() - 1u;
|
|
for arg_exprs.eachi |i, arg_expr| {
|
|
let arg_val = unpack_result!(bcx, {
|
|
trans_arg_expr(bcx,
|
|
arg_tys[i],
|
|
ty::ByCopy,
|
|
*arg_expr,
|
|
&mut temp_cleanups,
|
|
if i == last { ret_flag } else { None },
|
|
autoref_arg)
|
|
});
|
|
llargs.push(arg_val);
|
|
}
|
|
}
|
|
ArgVals(vs) => {
|
|
llargs.push_all(vs);
|
|
}
|
|
}
|
|
|
|
// now that all arguments have been successfully built, we can revoke any
|
|
// temporary cleanups, as they are only needed if argument construction
|
|
// should fail (for example, cleanup of copy mode args).
|
|
for vec::each(temp_cleanups) |c| {
|
|
revoke_clean(bcx, *c)
|
|
}
|
|
|
|
return bcx;
|
|
}
|
|
|
|
pub enum AutorefArg {
|
|
DontAutorefArg,
|
|
DoAutorefArg
|
|
}
|
|
|
|
// temp_cleanups: cleanups that should run only if failure occurs before the
|
|
// call takes place:
|
|
pub fn trans_arg_expr(bcx: block,
|
|
formal_arg_ty: ty::t,
|
|
self_mode: ty::SelfMode,
|
|
arg_expr: @ast::expr,
|
|
temp_cleanups: &mut ~[ValueRef],
|
|
ret_flag: Option<ValueRef>,
|
|
autoref_arg: AutorefArg) -> Result {
|
|
let _icx = bcx.insn_ctxt("trans_arg_expr");
|
|
let ccx = bcx.ccx();
|
|
|
|
debug!("trans_arg_expr(formal_arg_ty=(%s), self_mode=%?, arg_expr=%s, \
|
|
ret_flag=%?)",
|
|
formal_arg_ty.repr(bcx.tcx()),
|
|
self_mode,
|
|
arg_expr.repr(bcx.tcx()),
|
|
ret_flag.map(|v| bcx.val_str(*v)));
|
|
|
|
// translate the arg expr to a datum
|
|
let arg_datumblock = match ret_flag {
|
|
None => expr::trans_to_datum(bcx, arg_expr),
|
|
|
|
// If there is a ret_flag, this *must* be a loop body
|
|
Some(_) => {
|
|
match arg_expr.node {
|
|
ast::expr_loop_body(
|
|
blk @ @ast::expr {
|
|
node: ast::expr_fn_block(ref decl, ref body),
|
|
_
|
|
}) => {
|
|
let scratch_ty = expr_ty(bcx, arg_expr);
|
|
let scratch = alloc_ty(bcx, scratch_ty);
|
|
let arg_ty = expr_ty(bcx, arg_expr);
|
|
let sigil = ty::ty_closure_sigil(arg_ty);
|
|
let bcx = closure::trans_expr_fn(
|
|
bcx, sigil, decl, body, arg_expr.id,
|
|
blk.id, Some(ret_flag), expr::SaveIn(scratch));
|
|
DatumBlock {bcx: bcx,
|
|
datum: Datum {val: scratch,
|
|
ty: scratch_ty,
|
|
mode: ByRef(RevokeClean)}}
|
|
}
|
|
_ => {
|
|
bcx.sess().impossible_case(
|
|
arg_expr.span, "ret_flag with non-loop-body expr");
|
|
}
|
|
}
|
|
}
|
|
};
|
|
let arg_datum = arg_datumblock.datum;
|
|
let bcx = arg_datumblock.bcx;
|
|
|
|
debug!(" arg datum: %s", arg_datum.to_str(bcx.ccx()));
|
|
|
|
let mut val;
|
|
if ty::type_is_bot(arg_datum.ty) {
|
|
// For values of type _|_, we generate an
|
|
// "undef" value, as such a value should never
|
|
// be inspected. It's important for the value
|
|
// to have type lldestty (the callee's expected type).
|
|
let llformal_arg_ty = type_of::type_of(ccx, formal_arg_ty);
|
|
unsafe {
|
|
val = llvm::LLVMGetUndef(llformal_arg_ty);
|
|
}
|
|
} else {
|
|
// FIXME(#3548) use the adjustments table
|
|
match autoref_arg {
|
|
DoAutorefArg => {
|
|
assert!(!
|
|
bcx.ccx().maps.moves_map.contains(&arg_expr.id));
|
|
val = arg_datum.to_ref_llval(bcx);
|
|
}
|
|
DontAutorefArg => {
|
|
match self_mode {
|
|
ty::ByRef => {
|
|
// This assertion should really be valid, but because
|
|
// the explicit self code currently passes by-ref, it
|
|
// does not hold.
|
|
//
|
|
//assert !bcx.ccx().maps.moves_map.contains_key(
|
|
// &arg_expr.id);
|
|
debug!("by ref arg with type %s",
|
|
bcx.ty_to_str(arg_datum.ty));
|
|
val = arg_datum.to_ref_llval(bcx);
|
|
}
|
|
ty::ByCopy => {
|
|
debug!("by copy arg with type %s, storing to scratch",
|
|
bcx.ty_to_str(arg_datum.ty));
|
|
let scratch = scratch_datum(bcx, arg_datum.ty, false);
|
|
|
|
arg_datum.store_to_datum(bcx,
|
|
arg_expr.id,
|
|
INIT,
|
|
scratch);
|
|
|
|
// Technically, ownership of val passes to the callee.
|
|
// However, we must cleanup should we fail before the
|
|
// callee is actually invoked.
|
|
scratch.add_clean(bcx);
|
|
temp_cleanups.push(scratch.val);
|
|
|
|
match arg_datum.appropriate_mode() {
|
|
ByValue => val = Load(bcx, scratch.val),
|
|
ByRef(_) => val = scratch.val,
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if formal_arg_ty != arg_datum.ty {
|
|
// this could happen due to e.g. subtyping
|
|
let llformal_arg_ty = type_of::type_of_explicit_arg(ccx, &formal_arg_ty);
|
|
let llformal_arg_ty = match self_mode {
|
|
ty::ByRef => T_ptr(llformal_arg_ty),
|
|
ty::ByCopy => llformal_arg_ty,
|
|
};
|
|
debug!("casting actual type (%s) to match formal (%s)",
|
|
bcx.val_str(val), bcx.llty_str(llformal_arg_ty));
|
|
val = PointerCast(bcx, val, llformal_arg_ty);
|
|
}
|
|
}
|
|
|
|
debug!("--- trans_arg_expr passing %s", val_str(bcx.ccx().tn, val));
|
|
return rslt(bcx, val);
|
|
}
|