322 lines
12 KiB
Rust
322 lines
12 KiB
Rust
// Copyright 2012 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::mangle_exported_name;
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use driver::session;
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use lib::llvm::ValueRef;
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use middle::trans::base::{set_llvm_fn_attrs, set_inline_hint};
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use middle::trans::base::{trans_enum_variant, push_ctxt, get_item_val};
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use middle::trans::base::{trans_fn, decl_internal_rust_fn};
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use middle::trans::base;
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use middle::trans::common::*;
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use middle::trans::meth;
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use middle::trans::intrinsic;
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use middle::ty;
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use middle::typeck;
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use util::ppaux::Repr;
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use syntax::ast;
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use syntax::ast_map;
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use syntax::ast_util::local_def;
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pub fn monomorphic_fn(ccx: &CrateContext,
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fn_id: ast::DefId,
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real_substs: &ty::substs,
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vtables: Option<typeck::vtable_res>,
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self_vtables: Option<typeck::vtable_param_res>,
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ref_id: Option<ast::NodeId>)
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-> (ValueRef, bool) {
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debug!("monomorphic_fn(\
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fn_id={}, \
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real_substs={}, \
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vtables={}, \
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self_vtable={}, \
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ref_id={:?})",
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fn_id.repr(ccx.tcx()),
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real_substs.repr(ccx.tcx()),
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vtables.repr(ccx.tcx()),
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self_vtables.repr(ccx.tcx()),
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ref_id);
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assert!(real_substs.tps.iter().all(|t| !ty::type_needs_infer(*t)));
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let _icx = push_ctxt("monomorphic_fn");
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let mut must_cast = false;
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let psubsts = @param_substs {
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tys: real_substs.tps.clone(),
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vtables: vtables,
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self_ty: real_substs.self_ty.clone(),
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self_vtables: self_vtables
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};
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for s in real_substs.tps.iter() { assert!(!ty::type_has_params(*s)); }
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for s in psubsts.tys.iter() { assert!(!ty::type_has_params(*s)); }
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let hash_id = make_mono_id(ccx, fn_id, &*psubsts);
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if hash_id.params.iter().any(
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|p| match *p { mono_precise(_, _) => false, _ => true }) {
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must_cast = true;
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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.repr(ccx.tcx()),
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psubsts.repr(ccx.tcx()),
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hash_id);
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{
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let monomorphized = ccx.monomorphized.borrow();
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match monomorphized.get().find(&hash_id) {
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Some(&val) => {
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debug!("leaving monomorphic fn {}",
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ty::item_path_str(ccx.tcx(), fn_id));
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return (val, must_cast);
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}
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None => ()
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}
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}
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let tpt = ty::lookup_item_type(ccx.tcx(), fn_id);
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let llitem_ty = tpt.ty;
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// We need to do special handling of the substitutions if we are
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// calling a static provided method. This is sort of unfortunate.
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let mut is_static_provided = None;
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let map_node = session::expect(
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ccx.sess(),
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ccx.tcx.map.find(fn_id.node),
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|| format!("while monomorphizing {:?}, couldn't find it in the \
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item map (may have attempted to monomorphize an item \
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defined in a different crate?)", fn_id));
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match map_node {
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ast_map::NodeForeignItem(_) => {
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if !ccx.tcx.map.get_foreign_abis(fn_id.node).is_intrinsic() {
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// Foreign externs don't have to be monomorphized.
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return (get_item_val(ccx, fn_id.node), true);
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}
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}
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ast_map::NodeTraitMethod(method) => {
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match *method {
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ast::Provided(m) => {
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// If this is a static provided method, indicate that
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// and stash the number of params on the method.
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if m.explicit_self.node == ast::SelfStatic {
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is_static_provided = Some(m.generics.ty_params.len());
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}
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}
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_ => {}
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}
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}
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_ => {}
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}
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debug!("monomorphic_fn about to subst into {}", llitem_ty.repr(ccx.tcx()));
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let mono_ty = match is_static_provided {
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None => ty::subst_tps(ccx.tcx(), psubsts.tys.as_slice(),
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psubsts.self_ty, llitem_ty),
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Some(num_method_ty_params) => {
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// Static default methods are a little unfortunate, in
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// that the "internal" and "external" type of them differ.
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// Internally, the method body can refer to Self, but the
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// externally visable type of the method has a type param
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// inserted in between the trait type params and the
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// method type params. The substs that we are given are
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// the proper substs *internally* to the method body, so
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// we have to use those when compiling it.
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//
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// In order to get the proper substitution to use on the
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// type of the method, we pull apart the substitution and
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// stick a substitution for the self type in.
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// This is a bit unfortunate.
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let idx = psubsts.tys.len() - num_method_ty_params;
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let substs = psubsts.tys.slice(0, idx) +
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&[psubsts.self_ty.unwrap()] + psubsts.tys.tailn(idx);
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debug!("static default: changed substitution to {}",
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substs.repr(ccx.tcx()));
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ty::subst_tps(ccx.tcx(), substs, None, llitem_ty)
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}
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};
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let f = match ty::get(mono_ty).sty {
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ty::ty_bare_fn(ref f) => {
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assert!(f.abis.is_rust() || f.abis.is_intrinsic());
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f
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}
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_ => fail!("expected bare rust fn or an intrinsic")
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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().find(&fn_id) {
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Some(&d) => d, None => 0
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};
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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_id.node),
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"reached the recursion limit during monomorphization");
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}
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monomorphizing.get().insert(fn_id, depth + 1);
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}
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let s = ccx.tcx.map.with_path(fn_id.node, |path| {
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mangle_exported_name(ccx, path, mono_ty, fn_id.node)
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});
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debug!("monomorphize_fn mangled to {}", s);
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let mk_lldecl = || {
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let lldecl = decl_internal_rust_fn(ccx, false,
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f.sig.inputs.as_slice(),
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f.sig.output, s);
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let mut monomorphized = ccx.monomorphized.borrow_mut();
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monomorphized.get().insert(hash_id, lldecl);
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lldecl
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};
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let lldecl = match map_node {
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ast_map::NodeItem(i) => {
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match *i {
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ast::Item {
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node: ast::ItemFn(decl, _, _, _, body),
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..
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} => {
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let d = mk_lldecl();
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set_llvm_fn_attrs(i.attrs.as_slice(), d);
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trans_fn(ccx, decl, body, d, Some(psubsts), fn_id.node, []);
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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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ast_map::NodeForeignItem(i) => {
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let simple = intrinsic::get_simple_intrinsic(ccx, i);
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match simple {
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Some(decl) => decl,
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None => {
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let d = mk_lldecl();
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intrinsic::trans_intrinsic(ccx, d, i, psubsts, ref_id);
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d
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}
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}
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}
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ast_map::NodeVariant(v) => {
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let parent = ccx.tcx.map.get_parent(fn_id.node);
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let tvs = ty::enum_variants(ccx.tcx(), local_def(parent));
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let this_tv = *tvs.iter().find(|tv| { tv.id.node == fn_id.node}).unwrap();
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let d = mk_lldecl();
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set_inline_hint(d);
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match v.node.kind {
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ast::TupleVariantKind(ref args) => {
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trans_enum_variant(ccx,
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parent,
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v,
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args.as_slice(),
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this_tv.disr_val,
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Some(psubsts),
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d);
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}
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ast::StructVariantKind(_) =>
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ccx.sess().bug("can't monomorphize struct variants"),
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}
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d
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}
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ast_map::NodeMethod(mth) => {
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let d = mk_lldecl();
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set_llvm_fn_attrs(mth.attrs.as_slice(), d);
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trans_fn(ccx, mth.decl, mth.body, d, Some(psubsts), mth.id, []);
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d
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}
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ast_map::NodeTraitMethod(method) => {
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match *method {
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ast::Provided(mth) => {
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let d = mk_lldecl();
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set_llvm_fn_attrs(mth.attrs.as_slice(), d);
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trans_fn(ccx, mth.decl, mth.body, d, Some(psubsts), mth.id, []);
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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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ast_map::NodeStructCtor(struct_def) => {
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let d = mk_lldecl();
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set_inline_hint(d);
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base::trans_tuple_struct(ccx,
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struct_def.fields.as_slice(),
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struct_def.ctor_id.expect("ast-mapped tuple struct \
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didn't have a ctor id"),
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Some(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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ast_map::NodeExpr(..) |
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ast_map::NodeStmt(..) |
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ast_map::NodeArg(..) |
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ast_map::NodeBlock(..) |
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ast_map::NodeLocal(..) => {
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ccx.sess().bug(format!("can't monomorphize a {:?}", map_node))
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}
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};
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{
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let mut monomorphizing = ccx.monomorphizing.borrow_mut();
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monomorphizing.get().insert(fn_id, depth);
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}
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debug!("leaving monomorphic fn {}", ty::item_path_str(ccx.tcx(), fn_id));
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(lldecl, must_cast)
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}
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pub fn make_mono_id(ccx: &CrateContext,
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item: ast::DefId,
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substs: ¶m_substs) -> mono_id {
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// FIXME (possibly #5801): Need a lot of type hints to get
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// .collect() to work.
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let substs_iter = substs.self_ty.iter().chain(substs.tys.iter());
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let precise_param_ids: Vec<(ty::t, Option<@Vec<mono_id> >)> = match substs.vtables {
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Some(vts) => {
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debug!("make_mono_id vtables={} substs={}",
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vts.repr(ccx.tcx()), substs.tys.repr(ccx.tcx()));
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let vts_iter = substs.self_vtables.iter().chain(vts.iter());
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vts_iter.zip(substs_iter).map(|(vtable, subst)| {
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let v = vtable.map(|vt| meth::vtable_id(ccx, vt));
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(*subst, if !v.is_empty() { Some(@v) } else { None })
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}).collect()
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}
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None => substs_iter.map(|subst| (*subst, None::<@Vec<mono_id> >)).collect()
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};
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let param_ids = precise_param_ids.iter().map(|x| {
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let (a, b) = *x;
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mono_precise(a, b)
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}).collect();
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@mono_id_ {def: item, params: param_ids}
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}
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