311 lines
11 KiB
Rust
311 lines
11 KiB
Rust
// Copyright 2012-2014 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 back::link::exported_name;
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use llvm::ValueRef;
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use llvm;
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use middle::def_id::DefId;
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use middle::infer::normalize_associated_type;
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use middle::subst;
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use middle::subst::{Subst, Substs};
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use middle::ty::fold::{TypeFolder, TypeFoldable};
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use trans::attributes;
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use trans::base::{trans_enum_variant, push_ctxt, get_item_val};
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use trans::base::trans_fn;
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use trans::base;
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use trans::common::*;
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use trans::declare;
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use trans::foreign;
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use middle::ty::{self, Ty, TyCtxt};
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use trans::Disr;
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use rustc::front::map as hir_map;
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use rustc_front::hir;
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use syntax::abi::Abi;
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use syntax::ast;
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use syntax::attr;
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use syntax::errors;
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use std::hash::{Hasher, Hash, SipHasher};
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pub fn monomorphic_fn<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
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fn_id: DefId,
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psubsts: &'tcx subst::Substs<'tcx>)
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-> (ValueRef, Ty<'tcx>, bool) {
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debug!("monomorphic_fn(fn_id={:?}, real_substs={:?})", fn_id, psubsts);
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assert!(!psubsts.types.needs_infer() && !psubsts.types.has_param_types());
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// we can only monomorphize things in this crate (or inlined into it)
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let fn_node_id = ccx.tcx().map.as_local_node_id(fn_id).unwrap();
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let _icx = push_ctxt("monomorphic_fn");
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let hash_id = MonoId {
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def: fn_id,
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params: &psubsts.types
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};
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let item_ty = ccx.tcx().lookup_item_type(fn_id).ty;
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debug!("monomorphic_fn about to subst into {:?}", item_ty);
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let mono_ty = apply_param_substs(ccx.tcx(), psubsts, &item_ty);
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debug!("mono_ty = {:?} (post-substitution)", mono_ty);
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match ccx.monomorphized().borrow().get(&hash_id) {
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Some(&val) => {
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debug!("leaving monomorphic fn {}",
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ccx.tcx().item_path_str(fn_id));
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return (val, mono_ty, false);
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}
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None => ()
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}
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debug!("monomorphic_fn(\
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fn_id={:?}, \
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psubsts={:?}, \
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hash_id={:?})",
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fn_id,
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psubsts,
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hash_id);
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let map_node = errors::expect(
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ccx.sess().diagnostic(),
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ccx.tcx().map.find(fn_node_id),
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|| {
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format!("while monomorphizing {:?}, couldn't find it in \
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the item map (may have attempted to monomorphize \
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an item defined in a different crate?)",
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fn_id)
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});
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if let hir_map::NodeForeignItem(_) = map_node {
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let abi = ccx.tcx().map.get_foreign_abi(fn_node_id);
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if abi != Abi::RustIntrinsic && abi != Abi::PlatformIntrinsic {
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// Foreign externs don't have to be monomorphized.
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return (get_item_val(ccx, fn_node_id), mono_ty, true);
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}
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}
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ccx.stats().n_monos.set(ccx.stats().n_monos.get() + 1);
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let depth;
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{
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let mut monomorphizing = ccx.monomorphizing().borrow_mut();
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depth = match monomorphizing.get(&fn_id) {
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Some(&d) => d, None => 0
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};
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debug!("monomorphic_fn: depth for fn_id={:?} is {:?}", fn_id, depth+1);
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// Random cut-off -- code that needs to instantiate the same function
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// recursively more than thirty times can probably safely be assumed
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// to be causing an infinite expansion.
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if depth > ccx.sess().recursion_limit.get() {
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ccx.sess().span_fatal(ccx.tcx().map.span(fn_node_id),
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"reached the recursion limit during monomorphization");
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}
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monomorphizing.insert(fn_id, depth + 1);
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}
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let hash;
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let s = {
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let mut state = SipHasher::new();
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hash_id.hash(&mut state);
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mono_ty.hash(&mut state);
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hash = format!("h{}", state.finish());
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let path = ccx.tcx().map.def_path_from_id(fn_node_id);
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exported_name(path, &hash[..])
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};
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debug!("monomorphize_fn mangled to {}", s);
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// This shouldn't need to option dance.
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let mut hash_id = Some(hash_id);
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let mut mk_lldecl = |abi: Abi| {
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let lldecl = if abi != Abi::Rust {
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foreign::decl_rust_fn_with_foreign_abi(ccx, mono_ty, &s)
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} else {
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// FIXME(nagisa): perhaps needs a more fine grained selection? See
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// setup_lldecl below.
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declare::define_internal_rust_fn(ccx, &s, mono_ty)
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};
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ccx.monomorphized().borrow_mut().insert(hash_id.take().unwrap(), lldecl);
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lldecl
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};
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let setup_lldecl = |lldecl, attrs: &[ast::Attribute]| {
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base::update_linkage(ccx, lldecl, None, base::OriginalTranslation);
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attributes::from_fn_attrs(ccx, attrs, lldecl);
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let is_first = !ccx.available_monomorphizations().borrow().contains(&s);
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if is_first {
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ccx.available_monomorphizations().borrow_mut().insert(s.clone());
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}
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let trans_everywhere = attr::requests_inline(attrs);
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if trans_everywhere && !is_first {
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llvm::SetLinkage(lldecl, llvm::AvailableExternallyLinkage);
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}
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// If `true`, then `lldecl` should be given a function body.
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// Otherwise, it should be left as a declaration of an external
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// function, with no definition in the current compilation unit.
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trans_everywhere || is_first
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};
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let lldecl = match map_node {
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hir_map::NodeItem(i) => {
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match *i {
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hir::Item {
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node: hir::ItemFn(ref decl, _, _, abi, _, ref body),
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..
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} => {
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let d = mk_lldecl(abi);
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let needs_body = setup_lldecl(d, &i.attrs);
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if needs_body {
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if abi != Abi::Rust {
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foreign::trans_rust_fn_with_foreign_abi(
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ccx, &decl, &body, &[], d, psubsts, fn_node_id,
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Some(&hash[..]));
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} else {
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trans_fn(ccx,
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&decl,
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&body,
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d,
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psubsts,
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fn_node_id,
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&i.attrs);
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}
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}
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d
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}
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_ => {
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ccx.sess().bug("Can't monomorphize this kind of item")
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}
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}
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}
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hir_map::NodeVariant(v) => {
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let variant = inlined_variant_def(ccx, fn_node_id);
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assert_eq!(v.node.name, variant.name);
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let d = mk_lldecl(Abi::Rust);
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attributes::inline(d, attributes::InlineAttr::Hint);
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trans_enum_variant(ccx, fn_node_id, Disr::from(variant.disr_val), psubsts, d);
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d
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}
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hir_map::NodeImplItem(impl_item) => {
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match impl_item.node {
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hir::ImplItemKind::Method(ref sig, ref body) => {
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let d = mk_lldecl(Abi::Rust);
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let needs_body = setup_lldecl(d, &impl_item.attrs);
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if needs_body {
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trans_fn(ccx,
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&sig.decl,
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body,
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d,
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psubsts,
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impl_item.id,
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&impl_item.attrs);
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}
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d
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}
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_ => {
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ccx.sess().bug(&format!("can't monomorphize a {:?}",
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map_node))
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}
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}
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}
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hir_map::NodeTraitItem(trait_item) => {
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match trait_item.node {
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hir::MethodTraitItem(ref sig, Some(ref body)) => {
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let d = mk_lldecl(Abi::Rust);
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let needs_body = setup_lldecl(d, &trait_item.attrs);
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if needs_body {
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trans_fn(ccx,
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&sig.decl,
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body,
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d,
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psubsts,
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trait_item.id,
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&trait_item.attrs);
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}
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d
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}
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_ => {
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ccx.sess().bug(&format!("can't monomorphize a {:?}",
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map_node))
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}
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}
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}
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hir_map::NodeStructCtor(struct_def) => {
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let d = mk_lldecl(Abi::Rust);
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attributes::inline(d, attributes::InlineAttr::Hint);
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if struct_def.is_struct() {
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panic!("ast-mapped struct didn't have a ctor id")
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}
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base::trans_tuple_struct(ccx,
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struct_def.id(),
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psubsts,
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d);
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d
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}
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// Ugh -- but this ensures any new variants won't be forgotten
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hir_map::NodeForeignItem(..) |
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hir_map::NodeLifetime(..) |
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hir_map::NodeTyParam(..) |
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hir_map::NodeExpr(..) |
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hir_map::NodeStmt(..) |
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hir_map::NodeBlock(..) |
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hir_map::NodePat(..) |
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hir_map::NodeLocal(..) => {
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ccx.sess().bug(&format!("can't monomorphize a {:?}",
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map_node))
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}
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};
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ccx.monomorphizing().borrow_mut().insert(fn_id, depth);
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debug!("leaving monomorphic fn {}", ccx.tcx().item_path_str(fn_id));
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(lldecl, mono_ty, true)
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}
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#[derive(PartialEq, Eq, Hash, Debug)]
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pub struct MonoId<'tcx> {
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pub def: DefId,
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pub params: &'tcx subst::VecPerParamSpace<Ty<'tcx>>
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}
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/// Monomorphizes a type from the AST by first applying the in-scope
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/// substitutions and then normalizing any associated types.
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pub fn apply_param_substs<'tcx,T>(tcx: &TyCtxt<'tcx>,
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param_substs: &Substs<'tcx>,
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value: &T)
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-> T
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where T : TypeFoldable<'tcx>
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{
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let substituted = value.subst(tcx, param_substs);
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normalize_associated_type(tcx, &substituted)
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}
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/// Returns the normalized type of a struct field
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pub fn field_ty<'tcx>(tcx: &TyCtxt<'tcx>,
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param_substs: &Substs<'tcx>,
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f: ty::FieldDef<'tcx>)
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-> Ty<'tcx>
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{
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normalize_associated_type(tcx, &f.ty(tcx, param_substs))
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}
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