419ac4a1b8
Major changes: - Define temporary scopes in a syntax-based way that basically defaults to the innermost statement or conditional block, except for in a `let` initializer, where we default to the innermost block. Rules are documented in the code, but not in the manual (yet). See new test run-pass/cleanup-value-scopes.rs for examples. - Refactors Datum to better define cleanup roles. - Refactor cleanup scopes to not be tied to basic blocks, permitting us to have a very large number of scopes (one per AST node). - Introduce nascent documentation in trans/doc.rs covering datums and cleanup in a more comprehensive way.
187 lines
7.2 KiB
Rust
187 lines
7.2 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 lib::llvm::{AvailableExternallyLinkage, SetLinkage};
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use metadata::csearch;
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use middle::astencode;
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use middle::trans::base::{push_ctxt, trans_item, get_item_val, trans_fn};
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use middle::trans::common::*;
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use middle::ty;
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use util::ppaux::ty_to_str;
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use std::vec;
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use syntax::ast;
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use syntax::ast_map::PathName;
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use syntax::ast_util::local_def;
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use syntax::attr;
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pub fn maybe_instantiate_inline(ccx: @CrateContext, fn_id: ast::DefId)
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-> ast::DefId {
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let _icx = push_ctxt("maybe_instantiate_inline");
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{
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let external = ccx.external.borrow();
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match external.get().find(&fn_id) {
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Some(&Some(node_id)) => {
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// Already inline
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debug!("maybe_instantiate_inline({}): already inline as node id {}",
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ty::item_path_str(ccx.tcx, fn_id), node_id);
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return local_def(node_id);
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}
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Some(&None) => {
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return fn_id; // Not inlinable
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}
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None => {
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// Not seen yet
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}
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}
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}
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let csearch_result =
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csearch::maybe_get_item_ast(
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ccx.tcx, fn_id,
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|a,b,c,d| {
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astencode::decode_inlined_item(a, b, ccx.maps, c.clone(), d)
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});
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return match csearch_result {
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csearch::not_found => {
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let mut external = ccx.external.borrow_mut();
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external.get().insert(fn_id, None);
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fn_id
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}
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csearch::found(ast::IIItem(item)) => {
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{
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let mut external = ccx.external.borrow_mut();
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let mut external_srcs = ccx.external_srcs.borrow_mut();
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external.get().insert(fn_id, Some(item.id));
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external_srcs.get().insert(item.id, fn_id);
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}
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ccx.stats.n_inlines.set(ccx.stats.n_inlines.get() + 1);
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trans_item(ccx, item);
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// We're bringing an external global into this crate, but we don't
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// want to create two copies of the global. If we do this, then if
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// you take the address of the global in two separate crates you get
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// two different addresses. This is bad for things like conditions,
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// but it could possibly have other adverse side effects. We still
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// want to achieve the optimizations related to this global,
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// however, so we use the available_externally linkage which llvm
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// provides
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match item.node {
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ast::ItemStatic(..) => {
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let g = get_item_val(ccx, item.id);
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// see the comment in get_item_val() as to why this check is
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// performed here.
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if !attr::contains_name(item.attrs,
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"address_insignificant") {
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SetLinkage(g, AvailableExternallyLinkage);
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}
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}
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_ => {}
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}
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local_def(item.id)
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}
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csearch::found(ast::IIForeign(item)) => {
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{
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let mut external = ccx.external.borrow_mut();
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let mut external_srcs = ccx.external_srcs.borrow_mut();
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external.get().insert(fn_id, Some(item.id));
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external_srcs.get().insert(item.id, fn_id);
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}
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local_def(item.id)
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}
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csearch::found_parent(parent_id, ast::IIItem(item)) => {
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{
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let mut external = ccx.external.borrow_mut();
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let mut external_srcs = ccx.external_srcs.borrow_mut();
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external.get().insert(parent_id, Some(item.id));
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external_srcs.get().insert(item.id, parent_id);
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}
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let mut my_id = 0;
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match item.node {
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ast::ItemEnum(_, _) => {
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let vs_here = ty::enum_variants(ccx.tcx, local_def(item.id));
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let vs_there = ty::enum_variants(ccx.tcx, parent_id);
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for (here, there) in vs_here.iter().zip(vs_there.iter()) {
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if there.id == fn_id { my_id = here.id.node; }
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let mut external = ccx.external.borrow_mut();
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external.get().insert(there.id, Some(here.id.node));
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}
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}
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ast::ItemStruct(ref struct_def, _) => {
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match struct_def.ctor_id {
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None => {}
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Some(ctor_id) => {
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let mut external = ccx.external.borrow_mut();
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let _ = external.get().insert(fn_id, Some(ctor_id));
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my_id = ctor_id;
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}
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}
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}
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_ => ccx.sess.bug("maybe_instantiate_inline: item has a \
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non-enum, non-struct parent")
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}
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trans_item(ccx, item);
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local_def(my_id)
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}
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csearch::found_parent(_, _) => {
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ccx.sess.bug("maybe_get_item_ast returned a found_parent \
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with a non-item parent");
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}
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csearch::found(ast::IIMethod(impl_did, is_provided, mth)) => {
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{
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let mut external = ccx.external.borrow_mut();
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let mut external_srcs = ccx.external_srcs.borrow_mut();
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external.get().insert(fn_id, Some(mth.id));
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external_srcs.get().insert(mth.id, fn_id);
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}
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ccx.stats.n_inlines.set(ccx.stats.n_inlines.get() + 1);
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// If this is a default method, we can't look up the
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// impl type. But we aren't going to translate anyways, so don't.
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if is_provided { return local_def(mth.id); }
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let impl_tpt = ty::lookup_item_type(ccx.tcx, impl_did);
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let num_type_params =
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impl_tpt.generics.type_param_defs.len() +
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mth.generics.ty_params.len();
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if num_type_params == 0 {
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let llfn = get_item_val(ccx, mth.id);
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let path = vec::append_one(
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ty::item_path(ccx.tcx, impl_did), PathName(mth.ident));
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let self_kind = match mth.explicit_self.node {
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ast::SelfStatic => None,
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_ => {
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let self_ty = ty::node_id_to_type(ccx.tcx,
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mth.self_id);
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debug!("calling inline trans_fn with self_ty {}",
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ty_to_str(ccx.tcx, self_ty));
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Some(self_ty)
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}
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};
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trans_fn(ccx,
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path,
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mth.decl,
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mth.body,
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llfn,
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self_kind,
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None,
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mth.id,
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[]);
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}
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local_def(mth.id)
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}
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};
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}
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