199 lines
8.2 KiB
Rust
199 lines
8.2 KiB
Rust
// Copyright 2014 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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use llvm::{AvailableExternallyLinkage, InternalLinkage, SetLinkage};
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use middle::cstore::{CrateStore, FoundAst, InlinedItem};
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use middle::def_id::DefId;
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use middle::subst::Substs;
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use trans::base::{push_ctxt, trans_item, get_item_val, trans_fn};
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use trans::common::*;
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use rustc::dep_graph::DepNode;
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use rustc_front::hir;
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fn instantiate_inline(ccx: &CrateContext, fn_id: DefId) -> Option<DefId> {
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debug!("instantiate_inline({:?})", fn_id);
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let _icx = push_ctxt("instantiate_inline");
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let _task = ccx.tcx().dep_graph.in_task(DepNode::TransInlinedItem(fn_id));
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match ccx.external().borrow().get(&fn_id) {
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Some(&Some(node_id)) => {
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// Already inline
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debug!("instantiate_inline({}): already inline as node id {}",
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ccx.tcx().item_path_str(fn_id), node_id);
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let node_def_id = ccx.tcx().map.local_def_id(node_id);
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return Some(node_def_id);
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}
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Some(&None) => {
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return None; // Not inlinable
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}
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None => {
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// Not seen yet
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}
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}
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let inlined = ccx.tcx().sess.cstore.maybe_get_item_ast(ccx.tcx(), fn_id);
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let inline_id = match inlined {
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FoundAst::NotFound => {
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ccx.external().borrow_mut().insert(fn_id, None);
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return None;
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}
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FoundAst::Found(&InlinedItem::Item(ref item)) => {
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ccx.external().borrow_mut().insert(fn_id, Some(item.id));
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ccx.external_srcs().borrow_mut().insert(item.id, fn_id);
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ccx.stats().n_inlines.set(ccx.stats().n_inlines.get() + 1);
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trans_item(ccx, item);
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let linkage = match item.node {
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hir::ItemFn(_, _, _, _, ref generics, _) => {
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if generics.is_type_parameterized() {
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// Generics have no symbol, so they can't be given any
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// linkage.
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None
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} else {
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if ccx.sess().opts.cg.codegen_units == 1 {
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// We could use AvailableExternallyLinkage here,
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// but InternalLinkage allows LLVM to optimize more
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// aggressively (at the cost of sometimes
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// duplicating code).
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Some(InternalLinkage)
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} else {
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// With multiple compilation units, duplicated code
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// is more of a problem. Also, `codegen_units > 1`
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// means the user is okay with losing some
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// performance.
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Some(AvailableExternallyLinkage)
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}
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}
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}
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hir::ItemConst(..) => None,
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_ => unreachable!(),
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};
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match linkage {
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Some(linkage) => {
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let g = get_item_val(ccx, item.id);
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SetLinkage(g, linkage);
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}
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None => {}
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}
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item.id
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}
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FoundAst::Found(&InlinedItem::Foreign(ref item)) => {
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ccx.external().borrow_mut().insert(fn_id, Some(item.id));
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ccx.external_srcs().borrow_mut().insert(item.id, fn_id);
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item.id
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}
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FoundAst::FoundParent(parent_id, &InlinedItem::Item(ref item)) => {
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ccx.external().borrow_mut().insert(parent_id, Some(item.id));
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ccx.external_srcs().borrow_mut().insert(item.id, parent_id);
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let mut my_id = 0;
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match item.node {
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hir::ItemEnum(ref ast_def, _) => {
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let ast_vs = &ast_def.variants;
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let ty_vs = &ccx.tcx().lookup_adt_def(parent_id).variants;
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assert_eq!(ast_vs.len(), ty_vs.len());
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for (ast_v, ty_v) in ast_vs.iter().zip(ty_vs.iter()) {
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if ty_v.did == fn_id { my_id = ast_v.node.data.id(); }
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ccx.external().borrow_mut().insert(ty_v.did, Some(ast_v.node.data.id()));
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}
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}
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hir::ItemStruct(ref struct_def, _) => {
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if struct_def.is_struct() {
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ccx.sess().bug("instantiate_inline: called on a \
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non-tuple struct")
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} else {
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ccx.external().borrow_mut().insert(fn_id, Some(struct_def.id()));
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my_id = struct_def.id();
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}
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}
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_ => ccx.sess().bug("instantiate_inline: item has a \
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non-enum, non-struct parent")
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}
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trans_item(ccx, &item);
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my_id
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}
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FoundAst::FoundParent(_, _) => {
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ccx.sess().bug("maybe_get_item_ast returned a FoundParent \
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with a non-item parent");
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}
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FoundAst::Found(&InlinedItem::TraitItem(_, ref trait_item)) => {
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ccx.external().borrow_mut().insert(fn_id, Some(trait_item.id));
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ccx.external_srcs().borrow_mut().insert(trait_item.id, fn_id);
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ccx.stats().n_inlines.set(ccx.stats().n_inlines.get() + 1);
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// Associated consts already have to be evaluated in `typeck`, so
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// the logic to do that already exists in `middle`. In order to
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// reuse that code, it needs to be able to look up the traits for
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// inlined items.
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let ty_trait_item = ccx.tcx().impl_or_trait_item(fn_id).clone();
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let trait_item_def_id = ccx.tcx().map.local_def_id(trait_item.id);
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ccx.tcx().impl_or_trait_items.borrow_mut()
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.insert(trait_item_def_id, ty_trait_item);
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// If this is a default method, we can't look up the
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// impl type. But we aren't going to translate anyways, so
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// don't.
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trait_item.id
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}
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FoundAst::Found(&InlinedItem::ImplItem(impl_did, ref impl_item)) => {
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ccx.external().borrow_mut().insert(fn_id, Some(impl_item.id));
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ccx.external_srcs().borrow_mut().insert(impl_item.id, fn_id);
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ccx.stats().n_inlines.set(ccx.stats().n_inlines.get() + 1);
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// Translate monomorphic impl methods immediately.
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if let hir::ImplItemKind::Method(ref sig, ref body) = impl_item.node {
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let impl_tpt = ccx.tcx().lookup_item_type(impl_did);
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if impl_tpt.generics.types.is_empty() &&
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sig.generics.ty_params.is_empty() {
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let empty_substs = ccx.tcx().mk_substs(Substs::trans_empty());
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let llfn = get_item_val(ccx, impl_item.id);
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trans_fn(ccx,
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&sig.decl,
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body,
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llfn,
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empty_substs,
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impl_item.id,
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&impl_item.attrs);
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// See linkage comments on items.
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if ccx.sess().opts.cg.codegen_units == 1 {
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SetLinkage(llfn, InternalLinkage);
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} else {
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SetLinkage(llfn, AvailableExternallyLinkage);
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}
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}
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}
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impl_item.id
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}
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};
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let inline_def_id = ccx.tcx().map.local_def_id(inline_id);
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Some(inline_def_id)
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}
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pub fn get_local_instance(ccx: &CrateContext, fn_id: DefId)
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-> Option<DefId> {
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if let Some(_) = ccx.tcx().map.as_local_node_id(fn_id) {
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Some(fn_id)
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} else {
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instantiate_inline(ccx, fn_id)
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}
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}
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pub fn maybe_instantiate_inline(ccx: &CrateContext, fn_id: DefId) -> DefId {
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get_local_instance(ccx, fn_id).unwrap_or(fn_id)
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}
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