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.
11 use back::link::exported_name;
15 use middle::subst::Subst;
16 use middle::trans::base::{set_llvm_fn_attrs, set_inline_hint};
17 use middle::trans::base::{trans_enum_variant, push_ctxt, get_item_val};
18 use middle::trans::base::{trans_fn, decl_internal_rust_fn};
19 use middle::trans::base;
20 use middle::trans::common::*;
23 use util::ppaux::Repr;
28 use syntax::ast_util::{local_def, PostExpansionMethod};
29 use std::hash::{sip, Hash};
31 pub fn monomorphic_fn(ccx: &CrateContext,
33 real_substs: &subst::Substs,
34 vtables: typeck::vtable_res,
35 ref_id: Option<ast::NodeId>)
37 debug!("monomorphic_fn(\
42 fn_id.repr(ccx.tcx()),
43 real_substs.repr(ccx.tcx()),
44 vtables.repr(ccx.tcx()),
47 assert!(real_substs.types.all(|t| {
48 !ty::type_needs_infer(*t) && !ty::type_has_params(*t)
51 let _icx = push_ctxt("monomorphic_fn");
53 let hash_id = MonoId {
55 params: real_substs.types.clone()
58 match ccx.monomorphized.borrow().find(&hash_id) {
60 debug!("leaving monomorphic fn {}",
61 ty::item_path_str(ccx.tcx(), fn_id));
67 let psubsts = param_substs {
68 substs: (*real_substs).clone(),
72 debug!("monomorphic_fn(\
76 fn_id.repr(ccx.tcx()),
77 psubsts.repr(ccx.tcx()),
80 let tpt = ty::lookup_item_type(ccx.tcx(), fn_id);
81 let llitem_ty = tpt.ty;
83 let map_node = session::expect(
85 ccx.tcx.map.find(fn_id.node),
87 format!("while monomorphizing {:?}, couldn't find it in \
88 the item map (may have attempted to monomorphize \
89 an item defined in a different crate?)",
94 ast_map::NodeForeignItem(_) => {
95 if ccx.tcx.map.get_foreign_abi(fn_id.node) != abi::RustIntrinsic {
96 // Foreign externs don't have to be monomorphized.
97 return (get_item_val(ccx, fn_id.node), true);
103 debug!("monomorphic_fn about to subst into {}", llitem_ty.repr(ccx.tcx()));
104 let mono_ty = llitem_ty.subst(ccx.tcx(), real_substs);
106 ccx.stats.n_monos.set(ccx.stats.n_monos.get() + 1);
110 let mut monomorphizing = ccx.monomorphizing.borrow_mut();
111 depth = match monomorphizing.find(&fn_id) {
112 Some(&d) => d, None => 0
115 // Random cut-off -- code that needs to instantiate the same function
116 // recursively more than thirty times can probably safely be assumed
117 // to be causing an infinite expansion.
118 if depth > ccx.sess().recursion_limit.get() {
119 ccx.sess().span_fatal(ccx.tcx.map.span(fn_id.node),
120 "reached the recursion limit during monomorphization");
123 monomorphizing.insert(fn_id, depth + 1);
126 let s = ccx.tcx.map.with_path(fn_id.node, |path| {
127 let mut state = sip::SipState::new();
128 hash_id.hash(&mut state);
129 mono_ty.hash(&mut state);
131 exported_name(path, format!("h{}", state.result()).as_slice())
133 debug!("monomorphize_fn mangled to {}", s);
135 // This shouldn't need to option dance.
136 let mut hash_id = Some(hash_id);
138 let lldecl = decl_internal_rust_fn(ccx, mono_ty, s.as_slice());
139 ccx.monomorphized.borrow_mut().insert(hash_id.take_unwrap(), lldecl);
143 let lldecl = match map_node {
144 ast_map::NodeItem(i) => {
147 node: ast::ItemFn(ref decl, _, _, _, ref body),
151 set_llvm_fn_attrs(i.attrs.as_slice(), d);
152 trans_fn(ccx, &**decl, &**body, d, &psubsts, fn_id.node, [],
157 ccx.sess().bug("Can't monomorphize this kind of item")
161 ast_map::NodeVariant(v) => {
162 let parent = ccx.tcx.map.get_parent(fn_id.node);
163 let tvs = ty::enum_variants(ccx.tcx(), local_def(parent));
164 let this_tv = tvs.iter().find(|tv| { tv.id.node == fn_id.node}).unwrap();
168 ast::TupleVariantKind(ref args) => {
169 trans_enum_variant(ccx,
177 ast::StructVariantKind(_) =>
178 ccx.sess().bug("can't monomorphize struct variants"),
182 ast_map::NodeMethod(mth) => {
184 set_llvm_fn_attrs(mth.attrs.as_slice(), d);
185 trans_fn(ccx, &*mth.pe_fn_decl(), &*mth.pe_body(), d, &psubsts, mth.id, [],
189 ast_map::NodeTraitMethod(method) => {
191 ast::Provided(mth) => {
193 set_llvm_fn_attrs(mth.attrs.as_slice(), d);
194 trans_fn(ccx, &*mth.pe_fn_decl(), &*mth.pe_body(), d,
195 &psubsts, mth.id, [], IgnoreItems);
199 ccx.sess().bug(format!("can't monomorphize a {:?}",
200 map_node).as_slice())
204 ast_map::NodeStructCtor(struct_def) => {
207 base::trans_tuple_struct(ccx,
208 struct_def.fields.as_slice(),
209 struct_def.ctor_id.expect("ast-mapped tuple struct \
210 didn't have a ctor id"),
216 // Ugh -- but this ensures any new variants won't be forgotten
217 ast_map::NodeForeignItem(..) |
218 ast_map::NodeLifetime(..) |
219 ast_map::NodeExpr(..) |
220 ast_map::NodeStmt(..) |
221 ast_map::NodeArg(..) |
222 ast_map::NodeBlock(..) |
223 ast_map::NodePat(..) |
224 ast_map::NodeLocal(..) => {
225 ccx.sess().bug(format!("can't monomorphize a {:?}",
226 map_node).as_slice())
230 ccx.monomorphizing.borrow_mut().insert(fn_id, depth);
232 debug!("leaving monomorphic fn {}", ty::item_path_str(ccx.tcx(), fn_id));
236 // Used to identify cached monomorphized functions and vtables
237 #[deriving(PartialEq, Eq, Hash)]
238 pub struct MonoParamId {
242 #[deriving(PartialEq, Eq, Hash)]
245 pub params: subst::VecPerParamSpace<ty::t>
248 pub fn make_vtable_id(_ccx: &CrateContext,
249 origin: &typeck::vtable_origin)
252 &typeck::vtable_static(impl_id, ref substs, _) => {
255 params: substs.types.clone()
259 &typeck::vtable_unboxed_closure(def_id) => {
262 params: subst::VecPerParamSpace::empty(),
266 // can't this be checked at the callee?
267 _ => fail!("make_vtable_id needs vtable_static")