1 // Copyright 2012 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.
12 use back::link::mangle_exported_name;
14 use lib::llvm::ValueRef;
15 use middle::trans::base::{set_llvm_fn_attrs, set_inline_hint};
16 use middle::trans::base::{trans_enum_variant, push_ctxt, get_item_val};
17 use middle::trans::base::{trans_fn, decl_internal_rust_fn};
18 use middle::trans::base;
19 use middle::trans::common::*;
20 use middle::trans::meth;
21 use middle::trans::intrinsic;
24 use util::ppaux::Repr;
28 use syntax::ast_util::local_def;
30 pub fn monomorphic_fn(ccx: @CrateContext,
32 real_substs: &ty::substs,
33 vtables: Option<typeck::vtable_res>,
34 self_vtables: Option<typeck::vtable_param_res>,
35 ref_id: Option<ast::NodeId>)
37 debug!("monomorphic_fn(\
44 real_substs.repr(ccx.tcx),
45 vtables.repr(ccx.tcx),
46 self_vtables.repr(ccx.tcx),
49 assert!(real_substs.tps.iter().all(|t| !ty::type_needs_infer(*t)));
50 let _icx = push_ctxt("monomorphic_fn");
51 let mut must_cast = false;
53 let psubsts = @param_substs {
54 tys: real_substs.tps.to_owned(),
56 self_ty: real_substs.self_ty.clone(),
57 self_vtables: self_vtables
60 for s in real_substs.tps.iter() { assert!(!ty::type_has_params(*s)); }
61 for s in psubsts.tys.iter() { assert!(!ty::type_has_params(*s)); }
63 let hash_id = make_mono_id(ccx, fn_id, &*psubsts);
64 if hash_id.params.iter().any(
65 |p| match *p { mono_precise(_, _) => false, _ => true }) {
69 debug!("monomorphic_fn(\
74 psubsts.repr(ccx.tcx),
78 let monomorphized = ccx.monomorphized.borrow();
79 match monomorphized.get().find(&hash_id) {
81 debug!("leaving monomorphic fn {}",
82 ty::item_path_str(ccx.tcx, fn_id));
83 return (val, must_cast);
89 let tpt = ty::lookup_item_type(ccx.tcx, fn_id);
90 let llitem_ty = tpt.ty;
92 // We need to do special handling of the substitutions if we are
93 // calling a static provided method. This is sort of unfortunate.
94 let mut is_static_provided = None;
96 let map_node = session::expect(
98 ccx.tcx.map.find(fn_id.node),
99 || format!("while monomorphizing {:?}, couldn't find it in the \
100 item map (may have attempted to monomorphize an item \
101 defined in a different crate?)", fn_id));
104 ast_map::NodeForeignItem(_) => {
105 if !ccx.tcx.map.get_foreign_abis(fn_id.node).is_intrinsic() {
106 // Foreign externs don't have to be monomorphized.
107 return (get_item_val(ccx, fn_id.node), true);
110 ast_map::NodeTraitMethod(method) => {
112 ast::Provided(m) => {
113 // If this is a static provided method, indicate that
114 // and stash the number of params on the method.
115 if m.explicit_self.node == ast::SelfStatic {
116 is_static_provided = Some(m.generics.ty_params.len());
125 debug!("monomorphic_fn about to subst into {}", llitem_ty.repr(ccx.tcx));
126 let mono_ty = match is_static_provided {
127 None => ty::subst_tps(ccx.tcx, psubsts.tys,
128 psubsts.self_ty, llitem_ty),
129 Some(num_method_ty_params) => {
130 // Static default methods are a little unfortunate, in
131 // that the "internal" and "external" type of them differ.
132 // Internally, the method body can refer to Self, but the
133 // externally visable type of the method has a type param
134 // inserted in between the trait type params and the
135 // method type params. The substs that we are given are
136 // the proper substs *internally* to the method body, so
137 // we have to use those when compiling it.
139 // In order to get the proper substitution to use on the
140 // type of the method, we pull apart the substitution and
141 // stick a substitution for the self type in.
142 // This is a bit unfortunate.
144 let idx = psubsts.tys.len() - num_method_ty_params;
145 let substs = psubsts.tys.slice(0, idx) +
146 &[psubsts.self_ty.unwrap()] + psubsts.tys.tailn(idx);
147 debug!("static default: changed substitution to {}",
148 substs.repr(ccx.tcx));
150 ty::subst_tps(ccx.tcx, substs, None, llitem_ty)
154 let f = match ty::get(mono_ty).sty {
155 ty::ty_bare_fn(ref f) => {
156 assert!(f.abis.is_rust() || f.abis.is_intrinsic());
159 _ => fail!("expected bare rust fn or an intrinsic")
162 ccx.stats.n_monos.set(ccx.stats.n_monos.get() + 1);
166 let mut monomorphizing = ccx.monomorphizing.borrow_mut();
167 depth = match monomorphizing.get().find(&fn_id) {
168 Some(&d) => d, None => 0
171 // Random cut-off -- code that needs to instantiate the same function
172 // recursively more than thirty times can probably safely be assumed
173 // to be causing an infinite expansion.
176 ccx.tcx.map.span(fn_id.node),
177 "overly deep expansion of inlined function");
179 monomorphizing.get().insert(fn_id, depth + 1);
182 let s = ccx.tcx.map.with_path(fn_id.node, |path| {
183 mangle_exported_name(ccx, path, mono_ty, fn_id.node)
185 debug!("monomorphize_fn mangled to {}", s);
188 let lldecl = decl_internal_rust_fn(ccx, false,
191 let mut monomorphized = ccx.monomorphized.borrow_mut();
192 monomorphized.get().insert(hash_id, lldecl);
196 let lldecl = match map_node {
197 ast_map::NodeItem(i) => {
200 node: ast::ItemFn(decl, _, _, _, body),
204 set_llvm_fn_attrs(i.attrs.as_slice(), d);
205 trans_fn(ccx, decl, body, d, Some(psubsts), fn_id.node, []);
209 ccx.tcx.sess.bug("Can't monomorphize this kind of item")
213 ast_map::NodeForeignItem(i) => {
214 let simple = intrinsic::get_simple_intrinsic(ccx, i);
219 intrinsic::trans_intrinsic(ccx, d, i, psubsts, ref_id);
224 ast_map::NodeVariant(v) => {
225 let parent = ccx.tcx.map.get_parent(fn_id.node);
226 let tvs = ty::enum_variants(ccx.tcx, local_def(parent));
227 let this_tv = *tvs.iter().find(|tv| { tv.id.node == fn_id.node}).unwrap();
231 ast::TupleVariantKind(ref args) => {
232 trans_enum_variant(ccx,
240 ast::StructVariantKind(_) =>
241 ccx.tcx.sess.bug("can't monomorphize struct variants"),
245 ast_map::NodeMethod(mth) => {
247 set_llvm_fn_attrs(mth.attrs.as_slice(), d);
248 trans_fn(ccx, mth.decl, mth.body, d, Some(psubsts), mth.id, []);
251 ast_map::NodeTraitMethod(method) => {
253 ast::Provided(mth) => {
255 set_llvm_fn_attrs(mth.attrs.as_slice(), d);
256 trans_fn(ccx, mth.decl, mth.body, d, Some(psubsts), mth.id, []);
260 ccx.tcx.sess.bug(format!("can't monomorphize a {:?}",
265 ast_map::NodeStructCtor(struct_def) => {
268 base::trans_tuple_struct(ccx,
269 struct_def.fields.as_slice(),
270 struct_def.ctor_id.expect("ast-mapped tuple struct \
271 didn't have a ctor id"),
277 // Ugh -- but this ensures any new variants won't be forgotten
278 ast_map::NodeExpr(..) |
279 ast_map::NodeStmt(..) |
280 ast_map::NodeArg(..) |
281 ast_map::NodeBlock(..) |
282 ast_map::NodeLocal(..) => {
283 ccx.tcx.sess.bug(format!("can't monomorphize a {:?}", map_node))
288 let mut monomorphizing = ccx.monomorphizing.borrow_mut();
289 monomorphizing.get().insert(fn_id, depth);
292 debug!("leaving monomorphic fn {}", ty::item_path_str(ccx.tcx, fn_id));
296 pub fn make_mono_id(ccx: @CrateContext,
298 substs: ¶m_substs) -> mono_id {
299 // FIXME (possibly #5801): Need a lot of type hints to get
300 // .collect() to work.
301 let substs_iter = substs.self_ty.iter().chain(substs.tys.iter());
302 let precise_param_ids: Vec<(ty::t, Option<@Vec<mono_id> >)> = match substs.vtables {
304 debug!("make_mono_id vtables={} substs={}",
305 vts.repr(ccx.tcx), substs.tys.repr(ccx.tcx));
306 let vts_iter = substs.self_vtables.iter().chain(vts.iter());
307 vts_iter.zip(substs_iter).map(|(vtable, subst)| {
308 let v = vtable.map(|vt| meth::vtable_id(ccx, vt));
309 (*subst, if !v.is_empty() { Some(@v) } else { None })
312 None => substs_iter.map(|subst| (*subst, None::<@Vec<mono_id> >)).collect()
316 let param_ids = precise_param_ids.iter().map(|x| {
320 @mono_id_ {def: item, params: param_ids}