601 lines
21 KiB
Rust
601 lines
21 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::abi;
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use lib::llvm::llvm;
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use lib::llvm::ValueRef;
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use lib;
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use metadata::csearch;
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use middle::trans::base::*;
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use middle::trans::build::*;
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use middle::trans::callee::*;
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use middle::trans::callee;
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use middle::trans::cleanup;
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use middle::trans::common::*;
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use middle::trans::datum::*;
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use middle::trans::expr::{SaveIn, Ignore};
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use middle::trans::expr;
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use middle::trans::glue;
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use middle::trans::monomorphize;
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use middle::trans::type_of::*;
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use middle::ty;
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use middle::typeck;
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use util::common::indenter;
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use util::ppaux::Repr;
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use middle::trans::type_::Type;
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use std::c_str::ToCStr;
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use std::vec;
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use syntax::parse::token;
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use syntax::{ast, ast_map, visit};
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/**
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The main "translation" pass for methods. Generates code
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for non-monomorphized methods only. Other methods will
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be generated once they are invoked with specific type parameters,
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see `trans::base::lval_static_fn()` or `trans::base::monomorphic_fn()`.
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*/
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pub fn trans_impl(ccx: @CrateContext,
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name: ast::Ident,
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methods: &[@ast::Method],
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generics: &ast::Generics,
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id: ast::NodeId) {
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let _icx = push_ctxt("meth::trans_impl");
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let tcx = ccx.tcx;
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debug!("trans_impl(name={}, id={:?})", name.repr(tcx), id);
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// Both here and below with generic methods, be sure to recurse and look for
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// items that we need to translate.
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if !generics.ty_params.is_empty() {
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let mut v = TransItemVisitor{ ccx: ccx };
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for method in methods.iter() {
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visit::walk_method_helper(&mut v, *method, ());
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}
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return;
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}
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for method in methods.iter() {
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if method.generics.ty_params.len() == 0u {
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let llfn = get_item_val(ccx, method.id);
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trans_fn(ccx, method.decl, method.body,
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llfn, None, method.id, []);
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} else {
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let mut v = TransItemVisitor{ ccx: ccx };
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visit::walk_method_helper(&mut v, *method, ());
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}
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}
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}
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/// Translates a (possibly monomorphized) method body.
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///
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/// Parameters:
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/// * `method`: the AST node for the method
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/// * `param_substs`: if this is a generic method, the current values for
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/// type parameters and so forth, else None
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/// * `llfn`: the LLVM ValueRef for the method
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///
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pub fn trans_method(ccx: @CrateContext, method: &ast::Method,
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param_substs: Option<@param_substs>,
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llfn: ValueRef) -> ValueRef {
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trans_fn(ccx, method.decl, method.body,
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llfn, param_substs, method.id, []);
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llfn
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}
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pub fn trans_method_callee<'a>(
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bcx: &'a Block<'a>,
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expr_id: ast::NodeId,
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this: &ast::Expr,
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arg_cleanup_scope: cleanup::ScopeId)
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-> Callee<'a> {
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let _icx = push_ctxt("meth::trans_method_callee");
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let (origin, method_ty) = match bcx.ccx().maps.method_map
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.borrow().get().find(&expr_id) {
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Some(method) => {
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debug!("trans_method_callee(expr_id={:?}, method={})",
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expr_id, method.repr(bcx.tcx()));
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(method.origin, method.ty)
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}
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None => {
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bcx.tcx().sess.span_bug(this.span, "method call expr wasn't in method map")
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}
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};
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match origin {
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typeck::MethodStatic(did) => {
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Callee {
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bcx: bcx,
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data: Fn(callee::trans_fn_ref(bcx, did, expr_id, true))
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}
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}
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typeck::MethodParam(typeck::MethodParam {
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trait_id: trait_id,
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method_num: off,
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param_num: p,
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bound_num: b
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}) => {
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match bcx.fcx.param_substs {
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Some(substs) => {
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ty::populate_implementations_for_trait_if_necessary(
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bcx.tcx(),
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trait_id);
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let vtbl = find_vtable(bcx.tcx(), substs, p, b);
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trans_monomorphized_callee(bcx, expr_id,
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trait_id, off, vtbl)
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}
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// how to get rid of this?
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None => fail!("trans_method_callee: missing param_substs")
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}
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}
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typeck::MethodObject(ref mt) => {
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trans_trait_callee(bcx,
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monomorphize_type(bcx, method_ty),
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mt.real_index,
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this,
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arg_cleanup_scope)
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}
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}
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}
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pub fn trans_static_method_callee(bcx: &Block,
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method_id: ast::DefId,
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trait_id: ast::DefId,
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expr_id: ast::NodeId)
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-> ValueRef {
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let _icx = push_ctxt("meth::trans_static_method_callee");
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let ccx = bcx.ccx();
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debug!("trans_static_method_callee(method_id={:?}, trait_id={}, \
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expr_id={:?})",
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method_id,
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ty::item_path_str(bcx.tcx(), trait_id),
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expr_id);
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let _indenter = indenter();
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ty::populate_implementations_for_trait_if_necessary(bcx.tcx(), trait_id);
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// When we translate a static fn defined in a trait like:
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//
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// trait<T1...Tn> Trait {
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// fn foo<M1...Mn>(...) {...}
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// }
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//
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// this winds up being translated as something like:
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//
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// fn foo<T1...Tn,self: Trait<T1...Tn>,M1...Mn>(...) {...}
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//
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// So when we see a call to this function foo, we have to figure
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// out which impl the `Trait<T1...Tn>` bound on the type `self` was
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// bound to.
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let bound_index = ty::lookup_trait_def(bcx.tcx(), trait_id).
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generics.type_param_defs().len();
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let mname = if method_id.krate == ast::LOCAL_CRATE {
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match bcx.tcx().map.get(method_id.node) {
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ast_map::NodeTraitMethod(method) => {
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let ident = match *method {
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ast::Required(ref m) => m.ident,
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ast::Provided(ref m) => m.ident
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};
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ident.name
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}
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_ => fail!("callee is not a trait method")
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}
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} else {
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csearch::get_item_path(bcx.tcx(), method_id).last().unwrap().name()
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};
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debug!("trans_static_method_callee: method_id={:?}, expr_id={:?}, \
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name={}", method_id, expr_id, token::get_name(mname));
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let vtbls = ccx.maps.vtable_map.borrow().get().get_copy(&expr_id);
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let vtbls = resolve_vtables_in_fn_ctxt(bcx.fcx, vtbls);
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match vtbls[bound_index][0] {
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typeck::vtable_static(impl_did, ref rcvr_substs, rcvr_origins) => {
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assert!(rcvr_substs.iter().all(|t| !ty::type_needs_infer(*t)));
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let mth_id = method_with_name(ccx, impl_did, mname);
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let (callee_substs, callee_origins) =
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combine_impl_and_methods_tps(
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bcx, mth_id, expr_id, false,
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*rcvr_substs, rcvr_origins);
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let llfn = trans_fn_ref_with_vtables(bcx, mth_id, expr_id,
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false, callee_substs,
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Some(callee_origins));
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let callee_ty = node_id_type(bcx, expr_id);
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let llty = type_of_fn_from_ty(ccx, callee_ty).ptr_to();
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PointerCast(bcx, llfn, llty)
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}
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_ => {
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fail!("vtable_param left in monomorphized \
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function's vtable substs");
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}
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}
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}
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pub fn method_with_name(ccx: &CrateContext,
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impl_id: ast::DefId,
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name: ast::Name) -> ast::DefId {
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{
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let impl_method_cache = ccx.impl_method_cache.borrow();
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let meth_id_opt = impl_method_cache.get().find_copy(&(impl_id, name));
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match meth_id_opt {
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Some(m) => return m,
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None => {}
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}
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}
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let impls = ccx.tcx.impls.borrow();
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let imp = impls.get().find(&impl_id)
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.expect("could not find impl while translating");
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let meth = imp.methods.iter().find(|m| m.ident.name == name)
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.expect("could not find method while translating");
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let mut impl_method_cache = ccx.impl_method_cache.borrow_mut();
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impl_method_cache.get().insert((impl_id, name), meth.def_id);
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meth.def_id
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}
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fn trans_monomorphized_callee<'a>(bcx: &'a Block<'a>,
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expr_id: ast::NodeId,
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trait_id: ast::DefId,
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n_method: uint,
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vtbl: typeck::vtable_origin)
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-> Callee<'a> {
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let _icx = push_ctxt("meth::trans_monomorphized_callee");
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match vtbl {
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typeck::vtable_static(impl_did, ref rcvr_substs, rcvr_origins) => {
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let ccx = bcx.ccx();
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let mname = ty::trait_method(ccx.tcx, trait_id, n_method).ident;
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let mth_id = method_with_name(bcx.ccx(), impl_did, mname.name);
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// create a concatenated set of substitutions which includes
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// those from the impl and those from the method:
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let (callee_substs, callee_origins) =
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combine_impl_and_methods_tps(
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bcx, mth_id, expr_id, true,
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*rcvr_substs, rcvr_origins);
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// translate the function
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let llfn = trans_fn_ref_with_vtables(bcx,
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mth_id,
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expr_id,
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true,
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callee_substs,
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Some(callee_origins));
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Callee { bcx: bcx, data: Fn(llfn) }
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}
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typeck::vtable_param(..) => {
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fail!("vtable_param left in monomorphized function's vtable substs");
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}
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}
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}
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fn combine_impl_and_methods_tps(bcx: &Block,
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mth_did: ast::DefId,
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expr_id: ast::NodeId,
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is_method: bool,
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rcvr_substs: &[ty::t],
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rcvr_origins: typeck::vtable_res)
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-> (~[ty::t], typeck::vtable_res) {
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/*!
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*
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* Creates a concatenated set of substitutions which includes
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* those from the impl and those from the method. This are
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* some subtle complications here. Statically, we have a list
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* of type parameters like `[T0, T1, T2, M1, M2, M3]` where
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* `Tn` are type parameters that appear on the receiver. For
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* example, if the receiver is a method parameter `A` with a
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* bound like `trait<B,C,D>` then `Tn` would be `[B,C,D]`.
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*
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* The weird part is that the type `A` might now be bound to
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* any other type, such as `foo<X>`. In that case, the vector
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* we want is: `[X, M1, M2, M3]`. Therefore, what we do now is
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* to slice off the method type parameters and append them to
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* the type parameters from the type that the receiver is
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* mapped to. */
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let ccx = bcx.ccx();
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let method = ty::method(ccx.tcx, mth_did);
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let n_m_tps = method.generics.type_param_defs().len();
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let node_substs = node_id_type_params(bcx, expr_id, is_method);
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debug!("rcvr_substs={:?}", rcvr_substs.repr(ccx.tcx));
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let ty_substs
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= vec::append(rcvr_substs.to_owned(),
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node_substs.tailn(node_substs.len() - n_m_tps));
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debug!("n_m_tps={:?}", n_m_tps);
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debug!("node_substs={:?}", node_substs.repr(ccx.tcx));
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debug!("ty_substs={:?}", ty_substs.repr(ccx.tcx));
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// Now, do the same work for the vtables. The vtables might not
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// exist, in which case we need to make them.
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let r_m_origins = match node_vtables(bcx, expr_id) {
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Some(vt) => vt,
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None => @vec::from_elem(node_substs.len(), @~[])
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};
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let vtables
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= @vec::append(rcvr_origins.to_owned(),
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r_m_origins.tailn(r_m_origins.len() - n_m_tps));
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(ty_substs, vtables)
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}
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fn trans_trait_callee<'a>(bcx: &'a Block<'a>,
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method_ty: ty::t,
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n_method: uint,
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self_expr: &ast::Expr,
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arg_cleanup_scope: cleanup::ScopeId)
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-> Callee<'a> {
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/*!
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* Create a method callee where the method is coming from a trait
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* object (e.g., ~Trait type). In this case, we must pull the fn
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* pointer out of the vtable that is packaged up with the object.
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* Objects are represented as a pair, so we first evaluate the self
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* expression and then extract the self data and vtable out of the
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* pair.
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*/
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let _icx = push_ctxt("meth::trans_trait_callee");
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let mut bcx = bcx;
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// Translate self_datum and take ownership of the value by
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// converting to an rvalue.
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let self_datum = unpack_datum!(
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bcx, expr::trans(bcx, self_expr));
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let llval = if ty::type_needs_drop(bcx.tcx(), self_datum.ty) {
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let self_datum = unpack_datum!(
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bcx, self_datum.to_rvalue_datum(bcx, "trait_callee"));
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// Convert to by-ref since `trans_trait_callee_from_llval` wants it
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// that way.
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let self_datum = unpack_datum!(
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bcx, self_datum.to_ref_datum(bcx));
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// Arrange cleanup in case something should go wrong before the
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// actual call occurs.
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self_datum.add_clean(bcx.fcx, arg_cleanup_scope)
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} else {
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// We don't have to do anything about cleanups for &Trait and &mut Trait.
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assert!(self_datum.kind.is_by_ref());
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self_datum.val
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};
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trans_trait_callee_from_llval(bcx, method_ty, n_method, llval)
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}
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pub fn trans_trait_callee_from_llval<'a>(bcx: &'a Block<'a>,
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callee_ty: ty::t,
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n_method: uint,
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llpair: ValueRef)
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-> Callee<'a> {
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/*!
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* Same as `trans_trait_callee()` above, except that it is given
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* a by-ref pointer to the object pair.
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*/
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let _icx = push_ctxt("meth::trans_trait_callee");
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let ccx = bcx.ccx();
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// Load the data pointer from the object.
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debug!("(translating trait callee) loading second index from pair");
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let llboxptr = GEPi(bcx, llpair, [0u, abi::trt_field_box]);
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let llbox = Load(bcx, llboxptr);
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let llself = PointerCast(bcx, llbox, Type::i8p());
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// Load the function from the vtable and cast it to the expected type.
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debug!("(translating trait callee) loading method");
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// Replace the self type (&Self or ~Self) with an opaque pointer.
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let llcallee_ty = match ty::get(callee_ty).sty {
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ty::ty_bare_fn(ref f) if f.abis.is_rust() => {
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type_of_rust_fn(ccx, true, f.sig.inputs.slice_from(1), f.sig.output)
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}
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_ => {
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ccx.sess.bug("meth::trans_trait_callee given non-bare-rust-fn");
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}
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};
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let llvtable = Load(bcx,
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PointerCast(bcx,
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GEPi(bcx, llpair,
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[0u, abi::trt_field_vtable]),
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Type::vtable().ptr_to().ptr_to()));
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let mptr = Load(bcx, GEPi(bcx, llvtable, [0u, n_method + 1]));
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let mptr = PointerCast(bcx, mptr, llcallee_ty.ptr_to());
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return Callee {
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bcx: bcx,
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data: TraitMethod(MethodData {
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llfn: mptr,
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llself: llself,
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})
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};
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}
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pub fn vtable_id(ccx: @CrateContext,
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origin: &typeck::vtable_origin)
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-> mono_id {
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match origin {
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&typeck::vtable_static(impl_id, ref substs, sub_vtables) => {
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let psubsts = param_substs {
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tys: (*substs).clone(),
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vtables: Some(sub_vtables),
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self_ty: None,
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self_vtables: None
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};
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monomorphize::make_mono_id(
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ccx,
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impl_id,
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&psubsts)
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}
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// can't this be checked at the callee?
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_ => fail!("vtable_id")
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}
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}
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/// Creates a returns a dynamic vtable for the given type and vtable origin.
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/// This is used only for objects.
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pub fn get_vtable(bcx: &Block,
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self_ty: ty::t,
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origins: typeck::vtable_param_res)
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-> ValueRef {
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let ccx = bcx.ccx();
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let _icx = push_ctxt("meth::get_vtable");
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// Check the cache.
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let hash_id = (self_ty, vtable_id(ccx, &origins[0]));
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|
{
|
|
let vtables = ccx.vtables.borrow();
|
|
match vtables.get().find(&hash_id) {
|
|
Some(&val) => { return val }
|
|
None => { }
|
|
}
|
|
}
|
|
|
|
// Not in the cache. Actually build it.
|
|
let methods = origins.flat_map(|origin| {
|
|
match *origin {
|
|
typeck::vtable_static(id, ref substs, sub_vtables) => {
|
|
emit_vtable_methods(bcx, id, *substs, sub_vtables)
|
|
}
|
|
_ => ccx.sess.bug("get_vtable: expected a static origin"),
|
|
}
|
|
});
|
|
|
|
// Generate a destructor for the vtable.
|
|
let drop_glue = glue::get_drop_glue(ccx, self_ty);
|
|
let vtable = make_vtable(ccx, drop_glue, methods);
|
|
|
|
let mut vtables = ccx.vtables.borrow_mut();
|
|
vtables.get().insert(hash_id, vtable);
|
|
return vtable;
|
|
}
|
|
|
|
/// Helper function to declare and initialize the vtable.
|
|
pub fn make_vtable(ccx: &CrateContext,
|
|
drop_glue: ValueRef,
|
|
ptrs: &[ValueRef])
|
|
-> ValueRef {
|
|
unsafe {
|
|
let _icx = push_ctxt("meth::make_vtable");
|
|
|
|
let mut components = ~[drop_glue];
|
|
for &ptr in ptrs.iter() {
|
|
components.push(ptr)
|
|
}
|
|
|
|
let tbl = C_struct(components, false);
|
|
let sym = token::gensym("vtable");
|
|
let vt_gvar = format!("vtable{}", sym).with_c_str(|buf| {
|
|
llvm::LLVMAddGlobal(ccx.llmod, val_ty(tbl).to_ref(), buf)
|
|
});
|
|
llvm::LLVMSetInitializer(vt_gvar, tbl);
|
|
llvm::LLVMSetGlobalConstant(vt_gvar, lib::llvm::True);
|
|
lib::llvm::SetLinkage(vt_gvar, lib::llvm::InternalLinkage);
|
|
vt_gvar
|
|
}
|
|
}
|
|
|
|
fn emit_vtable_methods(bcx: &Block,
|
|
impl_id: ast::DefId,
|
|
substs: &[ty::t],
|
|
vtables: typeck::vtable_res)
|
|
-> ~[ValueRef] {
|
|
let ccx = bcx.ccx();
|
|
let tcx = ccx.tcx;
|
|
|
|
let trt_id = match ty::impl_trait_ref(tcx, impl_id) {
|
|
Some(t_id) => t_id.def_id,
|
|
None => ccx.sess.bug("make_impl_vtable: don't know how to \
|
|
make a vtable for a type impl!")
|
|
};
|
|
|
|
ty::populate_implementations_for_trait_if_necessary(bcx.tcx(), trt_id);
|
|
|
|
let trait_method_def_ids = ty::trait_method_def_ids(tcx, trt_id);
|
|
trait_method_def_ids.map(|method_def_id| {
|
|
let ident = ty::method(tcx, *method_def_id).ident;
|
|
// The substitutions we have are on the impl, so we grab
|
|
// the method type from the impl to substitute into.
|
|
let m_id = method_with_name(ccx, impl_id, ident.name);
|
|
let m = ty::method(tcx, m_id);
|
|
debug!("(making impl vtable) emitting method {} at subst {}",
|
|
m.repr(tcx),
|
|
substs.repr(tcx));
|
|
if m.generics.has_type_params() ||
|
|
ty::type_has_self(ty::mk_bare_fn(tcx, m.fty.clone())) {
|
|
debug!("(making impl vtable) method has self or type params: {}",
|
|
token::get_ident(ident));
|
|
C_null(Type::nil().ptr_to())
|
|
} else {
|
|
trans_fn_ref_with_vtables(bcx, m_id, 0, false, substs, Some(vtables))
|
|
}
|
|
})
|
|
}
|
|
|
|
pub fn trans_trait_cast<'a>(bcx: &'a Block<'a>,
|
|
datum: Datum<Expr>,
|
|
id: ast::NodeId,
|
|
dest: expr::Dest)
|
|
-> &'a Block<'a> {
|
|
/*!
|
|
* Generates the code to convert from a pointer (`~T`, `&T`, etc)
|
|
* into an object (`~Trait`, `&Trait`, etc). This means creating a
|
|
* pair where the first word is the vtable and the second word is
|
|
* the pointer.
|
|
*/
|
|
|
|
let mut bcx = bcx;
|
|
let _icx = push_ctxt("meth::trans_cast");
|
|
|
|
let lldest = match dest {
|
|
Ignore => {
|
|
return datum.clean(bcx, "trait_cast", id);
|
|
}
|
|
SaveIn(dest) => dest
|
|
};
|
|
|
|
let ccx = bcx.ccx();
|
|
let v_ty = datum.ty;
|
|
let llbox_ty = type_of(bcx.ccx(), datum.ty);
|
|
|
|
// Store the pointer into the first half of pair.
|
|
let mut llboxdest = GEPi(bcx, lldest, [0u, abi::trt_field_box]);
|
|
llboxdest = PointerCast(bcx, llboxdest, llbox_ty.ptr_to());
|
|
bcx = datum.store_to(bcx, llboxdest);
|
|
|
|
// Store the vtable into the second half of pair.
|
|
// This is structured a bit funny because of dynamic borrow failures.
|
|
let origins = {
|
|
let res = {
|
|
let vtable_map = ccx.maps.vtable_map.borrow();
|
|
*vtable_map.get().get(&id)
|
|
};
|
|
let res = resolve_vtables_in_fn_ctxt(bcx.fcx, res);
|
|
res[0]
|
|
};
|
|
let vtable = get_vtable(bcx, v_ty, origins);
|
|
let llvtabledest = GEPi(bcx, lldest, [0u, abi::trt_field_vtable]);
|
|
let llvtabledest = PointerCast(bcx, llvtabledest, val_ty(vtable).ptr_to());
|
|
Store(bcx, vtable, llvtabledest);
|
|
|
|
bcx
|
|
}
|