1b81c5112a
Closes #2048
284 lines
10 KiB
Rust
284 lines
10 KiB
Rust
import libc::c_uint;
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import base::*;
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import common::*;
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import type_of::*;
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import build::*;
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import driver::session::session;
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import syntax::ast;
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import syntax::ast_util::local_def;
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import metadata::csearch;
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import back::{link, abi};
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import lib::llvm::llvm;
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import lib::llvm::{ValueRef, TypeRef};
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import lib::llvm::llvm::LLVMGetParam;
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import ast_map::{path, path_mod, path_name};
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import std::map::hashmap;
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fn trans_impl(ccx: @crate_ctxt, path: path, name: ast::ident,
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methods: [@ast::method], tps: [ast::ty_param]) {
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let _icx = ccx.insn_ctxt("impl::trans_impl");
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if tps.len() > 0u { ret; }
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let sub_path = path + [path_name(name)];
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for m in methods {
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if m.tps.len() == 0u {
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let llfn = get_item_val(ccx, m.id);
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trans_fn(ccx, sub_path + [path_name(m.ident)], m.decl, m.body,
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llfn, impl_self(ty::node_id_to_type(ccx.tcx, m.self_id)),
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none, m.id, none);
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}
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}
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}
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fn trans_self_arg(bcx: block, base: @ast::expr) -> result {
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let _icx = bcx.insn_ctxt("impl::trans_self_arg");
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let basety = expr_ty(bcx, base);
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let m_by_ref = ast::expl(ast::by_ref);
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let mut temp_cleanups = [];
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let result = trans_arg_expr(bcx, {mode: m_by_ref, ty: basety},
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T_ptr(type_of::type_of(bcx.ccx(), basety)),
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base, temp_cleanups);
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// by-ref self argument should not require cleanup in the case of
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// other arguments failing:
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assert temp_cleanups == [];
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ret result;
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}
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fn trans_method_callee(bcx: block, callee_id: ast::node_id,
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self: @ast::expr, origin: typeck::method_origin)
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-> lval_maybe_callee {
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let _icx = bcx.insn_ctxt("impl::trans_method_callee");
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alt origin {
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typeck::method_static(did) {
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let {bcx, val} = trans_self_arg(bcx, self);
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{env: self_env(val, node_id_type(bcx, self.id), none)
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with lval_static_fn(bcx, did, callee_id)}
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}
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typeck::method_param(iid, off, p, b) {
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alt check bcx.fcx.param_substs {
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some(substs) {
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trans_monomorphized_callee(bcx, callee_id, self,
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iid, off, p, b, substs)
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}
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}
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}
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typeck::method_iface(_, off) {
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trans_iface_callee(bcx, self, callee_id, off)
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}
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}
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}
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fn trans_vtable_callee(bcx: block, env: callee_env, vtable: ValueRef,
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callee_id: ast::node_id, n_method: uint)
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-> lval_maybe_callee {
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let _icx = bcx.insn_ctxt("impl::trans_vtable_callee");
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let bcx = bcx, ccx = bcx.ccx();
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let fty = node_id_type(bcx, callee_id);
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let llfty = type_of::type_of_fn_from_ty(ccx, fty);
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let vtable = PointerCast(bcx, vtable,
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T_ptr(T_array(T_ptr(llfty), n_method + 1u)));
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let mptr = Load(bcx, GEPi(bcx, vtable, [0, n_method as int]));
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{bcx: bcx, val: mptr, kind: owned, env: env}
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}
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fn method_with_name(ccx: @crate_ctxt, impl_id: ast::def_id,
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name: ast::ident) -> ast::def_id {
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if impl_id.crate == ast::local_crate {
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alt check ccx.tcx.items.get(impl_id.node) {
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ast_map::node_item(@{node: ast::item_impl(_, _, _, ms), _}, _) {
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local_def(option::get(vec::find(ms, {|m| m.ident == name})).id)
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}
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}
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} else {
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csearch::get_impl_method(ccx.sess.cstore, impl_id, name)
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}
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}
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fn method_ty_param_count(ccx: @crate_ctxt, m_id: ast::def_id) -> uint {
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if m_id.crate == ast::local_crate {
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alt check ccx.tcx.items.get(m_id.node) {
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ast_map::node_method(m, _, _) { vec::len(m.tps) }
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}
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} else {
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csearch::get_type_param_count(ccx.sess.cstore, m_id)
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}
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}
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fn trans_monomorphized_callee(bcx: block, callee_id: ast::node_id,
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base: @ast::expr, iface_id: ast::def_id,
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n_method: uint, n_param: uint, n_bound: uint,
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substs: param_substs) -> lval_maybe_callee {
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let _icx = bcx.insn_ctxt("impl::trans_monomorphized_callee");
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alt find_vtable_in_fn_ctxt(substs, n_param, n_bound) {
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typeck::vtable_static(impl_did, impl_substs, sub_origins) {
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let ccx = bcx.ccx();
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let mname = ty::iface_methods(ccx.tcx, iface_id)[n_method].ident;
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let mth_id = method_with_name(bcx.ccx(), impl_did, mname);
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let n_m_tps = method_ty_param_count(ccx, mth_id);
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let node_substs = node_id_type_params(bcx, callee_id);
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let ty_substs = impl_substs +
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vec::tailn(node_substs, node_substs.len() - n_m_tps);
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let {bcx, val} = trans_self_arg(bcx, base);
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let lval = lval_static_fn_inner(bcx, mth_id, callee_id, ty_substs,
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some(sub_origins));
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{env: self_env(val, node_id_type(bcx, base.id), none),
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val: PointerCast(bcx, lval.val, T_ptr(type_of_fn_from_ty(
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ccx, node_id_type(bcx, callee_id))))
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with lval}
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}
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typeck::vtable_iface(iid, tps) {
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trans_iface_callee(bcx, base, callee_id, n_method)
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}
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typeck::vtable_param(n_param, n_bound) {
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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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// Method callee where the vtable comes from a boxed iface
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fn trans_iface_callee(bcx: block, base: @ast::expr,
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callee_id: ast::node_id, n_method: uint)
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-> lval_maybe_callee {
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let _icx = bcx.insn_ctxt("impl::trans_iface_callee");
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let {bcx, val} = trans_temp_expr(bcx, base);
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let vtable = Load(bcx, PointerCast(bcx, GEPi(bcx, val, [0, 0]),
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T_ptr(T_ptr(T_vtable()))));
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let box = Load(bcx, GEPi(bcx, val, [0, 1]));
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// FIXME[impl] I doubt this is alignment-safe
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let self = GEPi(bcx, box, [0, abi::box_field_body]);
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let env = self_env(self, ty::mk_opaque_box(bcx.tcx()), some(box));
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trans_vtable_callee(bcx, env, vtable, callee_id, n_method)
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}
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fn find_vtable_in_fn_ctxt(ps: param_substs, n_param: uint, n_bound: uint)
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-> typeck::vtable_origin {
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let mut vtable_off = n_bound, i = 0u;
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// Vtables are stored in a flat array, finding the right one is
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// somewhat awkward
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for bounds in *ps.bounds {
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if i >= n_param { break; }
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for bound in *bounds {
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alt bound { ty::bound_iface(_) { vtable_off += 1u; } _ {} }
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}
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i += 1u;
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}
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option::get(ps.vtables)[vtable_off]
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}
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fn resolve_vtables_in_fn_ctxt(fcx: fn_ctxt, vts: typeck::vtable_res)
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-> typeck::vtable_res {
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@vec::map(*vts, {|d| resolve_vtable_in_fn_ctxt(fcx, d)})
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}
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fn resolve_vtable_in_fn_ctxt(fcx: fn_ctxt, vt: typeck::vtable_origin)
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-> typeck::vtable_origin {
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alt vt {
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typeck::vtable_static(iid, tys, sub) {
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let tys = alt fcx.param_substs {
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some(substs) {
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vec::map(tys, {|t|
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ty::substitute_type_params(fcx.ccx.tcx, substs.tys, t)
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})
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}
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_ { tys }
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};
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typeck::vtable_static(iid, tys, resolve_vtables_in_fn_ctxt(fcx, sub))
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}
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typeck::vtable_param(n_param, n_bound) {
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alt check fcx.param_substs {
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some(substs) {
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find_vtable_in_fn_ctxt(substs, n_param, n_bound)
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}
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}
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}
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_ { vt }
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}
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}
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fn vtable_id(ccx: @crate_ctxt, origin: typeck::vtable_origin) -> mono_id {
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alt check origin {
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typeck::vtable_static(impl_id, substs, sub_vtables) {
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make_mono_id(ccx, impl_id, substs,
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if (*sub_vtables).len() == 0u { none }
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else { some(sub_vtables) }, none)
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}
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typeck::vtable_iface(iface_id, substs) {
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@{def: iface_id,
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params: vec::map(substs, {|t| mono_precise(t, none)})}
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}
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}
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}
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fn get_vtable(ccx: @crate_ctxt, origin: typeck::vtable_origin)
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-> ValueRef {
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let hash_id = vtable_id(ccx, origin);
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alt ccx.vtables.find(hash_id) {
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some(val) { val }
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none {
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alt check origin {
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typeck::vtable_static(id, substs, sub_vtables) {
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make_impl_vtable(ccx, id, substs, sub_vtables)
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}
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}
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}
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}
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}
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fn make_vtable(ccx: @crate_ctxt, ptrs: [ValueRef]) -> ValueRef {
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let _icx = ccx.insn_ctxt("impl::make_vtable");
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let tbl = C_struct(ptrs);
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let vt_gvar = str::as_c_str(ccx.names("vtable"), {|buf|
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llvm::LLVMAddGlobal(ccx.llmod, val_ty(tbl), buf)
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});
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llvm::LLVMSetInitializer(vt_gvar, tbl);
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llvm::LLVMSetGlobalConstant(vt_gvar, lib::llvm::True);
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lib::llvm::SetLinkage(vt_gvar, lib::llvm::InternalLinkage);
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vt_gvar
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}
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fn make_impl_vtable(ccx: @crate_ctxt, impl_id: ast::def_id, substs: [ty::t],
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vtables: typeck::vtable_res) -> ValueRef {
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let _icx = ccx.insn_ctxt("impl::make_impl_vtable");
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let tcx = ccx.tcx;
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let ifce_id = ty::ty_to_def_id(option::get(ty::impl_iface(tcx, impl_id)));
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let has_tps = (*ty::lookup_item_type(ccx.tcx, impl_id).bounds).len() > 0u;
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make_vtable(ccx, vec::map(*ty::iface_methods(tcx, ifce_id), {|im|
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let fty = ty::substitute_type_params(tcx, substs,
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ty::mk_fn(tcx, im.fty));
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if (*im.tps).len() > 0u || ty::type_has_vars(fty) {
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C_null(T_ptr(T_nil()))
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} else {
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let m_id = method_with_name(ccx, impl_id, im.ident);
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if has_tps {
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monomorphic_fn(ccx, m_id, substs, some(vtables), none).val
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} else if m_id.crate == ast::local_crate {
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get_item_val(ccx, m_id.node)
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} else {
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trans_external_path(ccx, m_id, fty)
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}
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}
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}))
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}
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fn trans_cast(bcx: block, val: @ast::expr, id: ast::node_id, dest: dest)
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-> block {
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let _icx = bcx.insn_ctxt("impl::trans_cast");
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if dest == ignore { ret trans_expr(bcx, val, ignore); }
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let ccx = bcx.ccx();
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let v_ty = expr_ty(bcx, val);
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let {box, body} = malloc_boxed(bcx, v_ty);
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add_clean_free(bcx, box, false);
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let bcx = trans_expr_save_in(bcx, val, body);
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revoke_clean(bcx, box);
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let result = get_dest_addr(dest);
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Store(bcx, box, PointerCast(bcx, GEPi(bcx, result, [0, 1]),
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T_ptr(val_ty(box))));
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let orig = ccx.maps.vtable_map.get(id)[0];
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let orig = resolve_vtable_in_fn_ctxt(bcx.fcx, orig);
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let vtable = get_vtable(bcx.ccx(), orig);
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Store(bcx, vtable, PointerCast(bcx, GEPi(bcx, result, [0, 0]),
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T_ptr(val_ty(vtable))));
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bcx
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}
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