1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 use llvm::{AvailableExternallyLinkage, InternalLinkage, SetLinkage};
12 use metadata::csearch;
13 use metadata::inline::InlinedItem;
14 use middle::astencode;
15 use middle::subst::Substs;
16 use trans::base::{push_ctxt, trans_item, get_item_val, trans_fn};
20 use syntax::ast_util::local_def;
22 fn instantiate_inline(ccx: &CrateContext, fn_id: ast::DefId)
23 -> Option<ast::DefId> {
24 debug!("instantiate_inline({:?})", fn_id);
25 let _icx = push_ctxt("instantiate_inline");
27 match ccx.external().borrow().get(&fn_id) {
28 Some(&Some(node_id)) => {
30 debug!("instantiate_inline({}): already inline as node id {}",
31 ccx.tcx().item_path_str(fn_id), node_id);
32 return Some(local_def(node_id));
35 return None; // Not inlinable
43 csearch::maybe_get_item_ast(
45 Box::new(|a,b,c,d| astencode::decode_inlined_item(a, b, c, d)));
47 let inline_id = match csearch_result {
48 csearch::FoundAst::NotFound => {
49 ccx.external().borrow_mut().insert(fn_id, None);
52 csearch::FoundAst::Found(&InlinedItem::Item(ref item)) => {
53 ccx.external().borrow_mut().insert(fn_id, Some(item.id));
54 ccx.external_srcs().borrow_mut().insert(item.id, fn_id);
56 ccx.stats().n_inlines.set(ccx.stats().n_inlines.get() + 1);
57 trans_item(ccx, item);
59 let linkage = match item.node {
60 ast::ItemFn(_, _, _, _, ref generics, _) => {
61 if generics.is_type_parameterized() {
62 // Generics have no symbol, so they can't be given any
66 if ccx.sess().opts.cg.codegen_units == 1 {
67 // We could use AvailableExternallyLinkage here,
68 // but InternalLinkage allows LLVM to optimize more
69 // aggressively (at the cost of sometimes
73 // With multiple compilation units, duplicated code
74 // is more of a problem. Also, `codegen_units > 1`
75 // means the user is okay with losing some
77 Some(AvailableExternallyLinkage)
81 ast::ItemConst(..) => None,
87 let g = get_item_val(ccx, item.id);
88 SetLinkage(g, linkage);
95 csearch::FoundAst::Found(&InlinedItem::Foreign(ref item)) => {
96 ccx.external().borrow_mut().insert(fn_id, Some(item.id));
97 ccx.external_srcs().borrow_mut().insert(item.id, fn_id);
100 csearch::FoundAst::FoundParent(parent_id, &InlinedItem::Item(ref item)) => {
101 ccx.external().borrow_mut().insert(parent_id, Some(item.id));
102 ccx.external_srcs().borrow_mut().insert(item.id, parent_id);
106 ast::ItemEnum(ref ast_def, _) => {
107 let ast_vs = &ast_def.variants;
108 let ty_vs = &ccx.tcx().lookup_adt_def(parent_id).variants;
109 assert_eq!(ast_vs.len(), ty_vs.len());
110 for (ast_v, ty_v) in ast_vs.iter().zip(ty_vs.iter()) {
111 if ty_v.did == fn_id { my_id = ast_v.node.id; }
112 ccx.external().borrow_mut().insert(ty_v.did, Some(ast_v.node.id));
115 ast::ItemStruct(ref struct_def, _) => {
116 match struct_def.ctor_id {
117 None => ccx.sess().bug("instantiate_inline: called on a \
120 ccx.external().borrow_mut().insert(fn_id, Some(ctor_id));
125 _ => ccx.sess().bug("instantiate_inline: item has a \
126 non-enum, non-struct parent")
128 trans_item(ccx, &**item);
131 csearch::FoundAst::FoundParent(_, _) => {
132 ccx.sess().bug("maybe_get_item_ast returned a FoundParent \
133 with a non-item parent");
135 csearch::FoundAst::Found(&InlinedItem::TraitItem(_, ref trait_item)) => {
136 ccx.external().borrow_mut().insert(fn_id, Some(trait_item.id));
137 ccx.external_srcs().borrow_mut().insert(trait_item.id, fn_id);
139 ccx.stats().n_inlines.set(ccx.stats().n_inlines.get() + 1);
141 // Associated consts already have to be evaluated in `typeck`, so
142 // the logic to do that already exists in `middle`. In order to
143 // reuse that code, it needs to be able to look up the traits for
145 let ty_trait_item = ccx.tcx().impl_or_trait_item(fn_id).clone();
146 ccx.tcx().impl_or_trait_items.borrow_mut()
147 .insert(local_def(trait_item.id), ty_trait_item);
149 // If this is a default method, we can't look up the
150 // impl type. But we aren't going to translate anyways, so
154 csearch::FoundAst::Found(&InlinedItem::ImplItem(impl_did, ref impl_item)) => {
155 ccx.external().borrow_mut().insert(fn_id, Some(impl_item.id));
156 ccx.external_srcs().borrow_mut().insert(impl_item.id, fn_id);
158 ccx.stats().n_inlines.set(ccx.stats().n_inlines.get() + 1);
160 // Translate monomorphic impl methods immediately.
161 if let ast::MethodImplItem(ref sig, ref body) = impl_item.node {
162 let impl_tpt = ccx.tcx().lookup_item_type(impl_did);
163 if impl_tpt.generics.types.is_empty() &&
164 sig.generics.ty_params.is_empty() {
165 let empty_substs = ccx.tcx().mk_substs(Substs::trans_empty());
166 let llfn = get_item_val(ccx, impl_item.id);
174 // See linkage comments on items.
175 if ccx.sess().opts.cg.codegen_units == 1 {
176 SetLinkage(llfn, InternalLinkage);
178 SetLinkage(llfn, AvailableExternallyLinkage);
187 Some(local_def(inline_id))
190 pub fn get_local_instance(ccx: &CrateContext, fn_id: ast::DefId)
191 -> Option<ast::DefId> {
192 if fn_id.krate == ast::LOCAL_CRATE {
195 instantiate_inline(ccx, fn_id)
199 pub fn maybe_instantiate_inline(ccx: &CrateContext, fn_id: ast::DefId) -> ast::DefId {
200 get_local_instance(ccx, fn_id).unwrap_or(fn_id)