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// 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 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use lib::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;
use syntax::attr;
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, &ccx.maps, 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(..) => {
let g = get_item_val(ccx, item.id);
// see the comment in get_item_val() as to why this check is
// performed here.
if !attr::contains_name(item.attrs.as_slice(),
"address_insignificant") {
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::IIMethod(impl_did, is_provided, 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);
// 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.
if is_provided { return local_def(mth.id); }
let impl_tpt = ty::lookup_item_type(ccx.tcx(), impl_did);
let num_type_params =
impl_tpt.generics.type_param_defs().len() +
mth.generics.ty_params.len();
if num_type_params == 0 {
let llfn = get_item_val(ccx, mth.id);
trans_fn(ccx, mth.decl, mth.body, llfn, None, mth.id, []);
}
local_def(mth.id)
}
};
}
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