// Copyright 2012 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. use llvm::{AvailableExternallyLinkage, SetLinkage}; use metadata::csearch; use middle::astencode; use middle::trans::base::{push_ctxt, trans_item, get_item_val, trans_fn}; use middle::trans::common::*; use middle::ty; use syntax::ast; use syntax::ast_util::{local_def, PostExpansionMethod}; use syntax::ast_util; pub fn maybe_instantiate_inline(ccx: &CrateContext, fn_id: ast::DefId) -> ast::DefId { let _icx = push_ctxt("maybe_instantiate_inline"); match ccx.external().borrow().find(&fn_id) { Some(&Some(node_id)) => { // Already inline debug!("maybe_instantiate_inline({}): already inline as node id {}", ty::item_path_str(ccx.tcx(), fn_id), node_id); return local_def(node_id); } Some(&None) => { return fn_id; // Not inlinable } None => { // Not seen yet } } let csearch_result = csearch::maybe_get_item_ast( ccx.tcx(), fn_id, |a,b,c,d| astencode::decode_inlined_item(a, b, c, d)); return match csearch_result { csearch::not_found => { ccx.external().borrow_mut().insert(fn_id, None); fn_id } csearch::found(ast::IIItem(item)) => { ccx.external().borrow_mut().insert(fn_id, Some(item.id)); ccx.external_srcs().borrow_mut().insert(item.id, fn_id); ccx.stats().n_inlines.set(ccx.stats().n_inlines.get() + 1); trans_item(ccx, &*item); // We're bringing an external global into this crate, but we don't // want to create two copies of the global. If we do this, then if // you take the address of the global in two separate crates you get // two different addresses. This is bad for things like conditions, // but it could possibly have other adverse side effects. We still // want to achieve the optimizations related to this global, // however, so we use the available_externally linkage which llvm // provides match item.node { ast::ItemStatic(_, mutbl, _) => { let g = get_item_val(ccx, item.id); // see the comment in get_item_val() as to why this check is // performed here. if ast_util::static_has_significant_address( mutbl, item.attrs.as_slice()) { SetLinkage(g, AvailableExternallyLinkage); } } _ => {} } local_def(item.id) } csearch::found(ast::IIForeign(item)) => { ccx.external().borrow_mut().insert(fn_id, Some(item.id)); ccx.external_srcs().borrow_mut().insert(item.id, fn_id); local_def(item.id) } csearch::found_parent(parent_id, ast::IIItem(item)) => { ccx.external().borrow_mut().insert(parent_id, Some(item.id)); ccx.external_srcs().borrow_mut().insert(item.id, parent_id); let mut my_id = 0; match item.node { ast::ItemEnum(_, _) => { let vs_here = ty::enum_variants(ccx.tcx(), local_def(item.id)); let vs_there = ty::enum_variants(ccx.tcx(), parent_id); for (here, there) in vs_here.iter().zip(vs_there.iter()) { if there.id == fn_id { my_id = here.id.node; } ccx.external().borrow_mut().insert(there.id, Some(here.id.node)); } } ast::ItemStruct(ref struct_def, _) => { match struct_def.ctor_id { None => {} Some(ctor_id) => { ccx.external().borrow_mut().insert(fn_id, Some(ctor_id)); my_id = ctor_id; } } } _ => ccx.sess().bug("maybe_instantiate_inline: item has a \ non-enum, non-struct parent") } trans_item(ccx, &*item); local_def(my_id) } csearch::found_parent(_, _) => { ccx.sess().bug("maybe_get_item_ast returned a found_parent \ with a non-item parent"); } csearch::found(ast::IITraitItem(impl_did, impl_item)) => { match impl_item { ast::ProvidedInlinedTraitItem(mth) | ast::RequiredInlinedTraitItem(mth) => { ccx.external().borrow_mut().insert(fn_id, Some(mth.id)); ccx.external_srcs().borrow_mut().insert(mth.id, fn_id); ccx.stats().n_inlines.set(ccx.stats().n_inlines.get() + 1); } } match impl_item { ast::ProvidedInlinedTraitItem(mth) => { // If this is a default method, we can't look up the // impl type. But we aren't going to translate anyways, so // don't. local_def(mth.id) } ast::RequiredInlinedTraitItem(mth) => { let impl_tpt = ty::lookup_item_type(ccx.tcx(), impl_did); let unparameterized = impl_tpt.generics.types.is_empty() && mth.pe_generics().ty_params.is_empty(); if unparameterized { let llfn = get_item_val(ccx, mth.id); trans_fn(ccx, &*mth.pe_fn_decl(), &*mth.pe_body(), llfn, ¶m_substs::empty(), mth.id, []); } local_def(mth.id) } } } }; }