430 lines
16 KiB
Rust
430 lines
16 KiB
Rust
// Copyright 2012-2014 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 arena::TypedArena;
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use back::link::{self, mangle_internal_name_by_path_and_seq};
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use llvm::{ValueRef, get_params};
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use middle::def_id::DefId;
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use middle::infer;
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use trans::adt;
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use trans::attributes;
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use trans::base::*;
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use trans::build::*;
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use trans::callee::{self, ArgVals, Callee, TraitItem, MethodData};
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use trans::cleanup::{CleanupMethods, CustomScope, ScopeId};
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use trans::common::*;
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use trans::datum::{self, Datum, rvalue_scratch_datum, Rvalue};
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use trans::debuginfo::{self, DebugLoc};
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use trans::declare;
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use trans::expr;
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use trans::monomorphize::{MonoId};
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use trans::type_of::*;
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use trans::Disr;
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use middle::ty;
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use session::config::FullDebugInfo;
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use syntax::abi::RustCall;
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use syntax::ast;
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use syntax::attr::{ThinAttributes, ThinAttributesExt};
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use rustc_front::hir;
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fn load_closure_environment<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
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closure_def_id: DefId,
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arg_scope_id: ScopeId,
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freevars: &[ty::Freevar])
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-> Block<'blk, 'tcx>
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{
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let _icx = push_ctxt("closure::load_closure_environment");
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// Special case for small by-value selfs.
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let closure_ty = node_id_type(bcx, bcx.fcx.id);
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let self_type = self_type_for_closure(bcx.ccx(), closure_def_id, closure_ty);
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let kind = kind_for_closure(bcx.ccx(), closure_def_id);
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let llenv = if kind == ty::FnOnceClosureKind &&
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!arg_is_indirect(bcx.ccx(), self_type) {
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let datum = rvalue_scratch_datum(bcx,
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self_type,
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"closure_env");
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store_ty(bcx, bcx.fcx.llenv.unwrap(), datum.val, self_type);
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datum.val
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} else {
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bcx.fcx.llenv.unwrap()
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};
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// Store the pointer to closure data in an alloca for debug info because that's what the
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// llvm.dbg.declare intrinsic expects
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let env_pointer_alloca = if bcx.sess().opts.debuginfo == FullDebugInfo {
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let alloc = alloca(bcx, val_ty(llenv), "__debuginfo_env_ptr");
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Store(bcx, llenv, alloc);
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Some(alloc)
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} else {
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None
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};
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for (i, freevar) in freevars.iter().enumerate() {
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let upvar_id = ty::UpvarId { var_id: freevar.def.var_id(),
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closure_expr_id: bcx.fcx.id };
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let upvar_capture = bcx.tcx().upvar_capture(upvar_id).unwrap();
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let mut upvar_ptr = StructGEP(bcx, llenv, i);
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let captured_by_ref = match upvar_capture {
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ty::UpvarCapture::ByValue => false,
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ty::UpvarCapture::ByRef(..) => {
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upvar_ptr = Load(bcx, upvar_ptr);
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true
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}
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};
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let node_id = freevar.def.var_id();
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bcx.fcx.llupvars.borrow_mut().insert(node_id, upvar_ptr);
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if kind == ty::FnOnceClosureKind && !captured_by_ref {
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let hint = bcx.fcx.lldropflag_hints.borrow().hint_datum(upvar_id.var_id);
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bcx.fcx.schedule_drop_mem(arg_scope_id,
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upvar_ptr,
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node_id_type(bcx, node_id),
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hint)
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}
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if let Some(env_pointer_alloca) = env_pointer_alloca {
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debuginfo::create_captured_var_metadata(
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bcx,
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node_id,
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env_pointer_alloca,
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i,
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captured_by_ref,
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freevar.span);
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}
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}
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bcx
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}
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pub enum ClosureEnv<'a> {
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NotClosure,
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Closure(DefId, &'a [ty::Freevar]),
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}
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impl<'a> ClosureEnv<'a> {
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pub fn load<'blk,'tcx>(self, bcx: Block<'blk, 'tcx>, arg_scope: ScopeId)
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-> Block<'blk, 'tcx>
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{
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match self {
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ClosureEnv::NotClosure => bcx,
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ClosureEnv::Closure(def_id, freevars) => {
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if freevars.is_empty() {
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bcx
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} else {
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load_closure_environment(bcx, def_id, arg_scope, freevars)
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}
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}
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}
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}
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}
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/// Returns the LLVM function declaration for a closure, creating it if
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/// necessary. If the ID does not correspond to a closure ID, returns None.
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pub fn get_or_create_closure_declaration<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
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closure_id: DefId,
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substs: &ty::ClosureSubsts<'tcx>)
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-> ValueRef {
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// Normalize type so differences in regions and typedefs don't cause
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// duplicate declarations
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let substs = ccx.tcx().erase_regions(substs);
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let mono_id = MonoId {
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def: closure_id,
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params: &substs.func_substs.types
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};
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if let Some(&llfn) = ccx.closure_vals().borrow().get(&mono_id) {
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debug!("get_or_create_closure_declaration(): found closure {:?}: {:?}",
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mono_id, ccx.tn().val_to_string(llfn));
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return llfn;
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}
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let path = ccx.tcx().def_path(closure_id);
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let symbol = mangle_internal_name_by_path_and_seq(path, "closure");
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let function_type = ccx.tcx().mk_closure_from_closure_substs(closure_id, Box::new(substs));
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let llfn = declare::define_internal_rust_fn(ccx, &symbol[..], function_type);
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// set an inline hint for all closures
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attributes::inline(llfn, attributes::InlineAttr::Hint);
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debug!("get_or_create_declaration_if_closure(): inserting new \
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closure {:?} (type {}): {:?}",
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mono_id,
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ccx.tn().type_to_string(val_ty(llfn)),
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ccx.tn().val_to_string(llfn));
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ccx.closure_vals().borrow_mut().insert(mono_id, llfn);
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llfn
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}
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pub enum Dest<'a, 'tcx: 'a> {
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SaveIn(Block<'a, 'tcx>, ValueRef),
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Ignore(&'a CrateContext<'a, 'tcx>)
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}
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pub fn trans_closure_expr<'a, 'tcx>(dest: Dest<'a, 'tcx>,
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decl: &hir::FnDecl,
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body: &hir::Block,
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id: ast::NodeId,
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closure_def_id: DefId, // (*)
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closure_substs: &'tcx ty::ClosureSubsts<'tcx>,
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closure_expr_attrs: &ThinAttributes)
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-> Option<Block<'a, 'tcx>>
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{
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// (*) Note that in the case of inlined functions, the `closure_def_id` will be the
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// defid of the closure in its original crate, whereas `id` will be the id of the local
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// inlined copy.
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let param_substs = closure_substs.func_substs;
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let ccx = match dest {
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Dest::SaveIn(bcx, _) => bcx.ccx(),
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Dest::Ignore(ccx) => ccx
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};
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let tcx = ccx.tcx();
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let _icx = push_ctxt("closure::trans_closure_expr");
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debug!("trans_closure_expr(id={:?}, closure_def_id={:?}, closure_substs={:?})",
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id, closure_def_id, closure_substs);
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let llfn = get_or_create_closure_declaration(ccx, closure_def_id, closure_substs);
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// Get the type of this closure. Use the current `param_substs` as
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// the closure substitutions. This makes sense because the closure
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// takes the same set of type arguments as the enclosing fn, and
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// this function (`trans_closure`) is invoked at the point
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// of the closure expression.
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let infcx = infer::normalizing_infer_ctxt(ccx.tcx(), &ccx.tcx().tables);
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let function_type = infcx.closure_type(closure_def_id, closure_substs);
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let freevars: Vec<ty::Freevar> =
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tcx.with_freevars(id, |fv| fv.iter().cloned().collect());
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let sig = tcx.erase_late_bound_regions(&function_type.sig);
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let sig = infer::normalize_associated_type(ccx.tcx(), &sig);
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trans_closure(ccx,
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decl,
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body,
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llfn,
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param_substs,
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id,
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closure_expr_attrs.as_attr_slice(),
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sig.output,
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function_type.abi,
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ClosureEnv::Closure(closure_def_id, &freevars));
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// Don't hoist this to the top of the function. It's perfectly legitimate
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// to have a zero-size closure (in which case dest will be `Ignore`) and
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// we must still generate the closure body.
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let (mut bcx, dest_addr) = match dest {
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Dest::SaveIn(bcx, p) => (bcx, p),
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Dest::Ignore(_) => {
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debug!("trans_closure_expr() ignoring result");
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return None;
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}
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};
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let repr = adt::represent_type(ccx, node_id_type(bcx, id));
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// Create the closure.
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for (i, freevar) in freevars.iter().enumerate() {
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let datum = expr::trans_local_var(bcx, freevar.def);
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let upvar_slot_dest = adt::trans_field_ptr(
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bcx, &*repr, adt::MaybeSizedValue::sized(dest_addr), Disr(0), i);
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let upvar_id = ty::UpvarId { var_id: freevar.def.var_id(),
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closure_expr_id: id };
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match tcx.upvar_capture(upvar_id).unwrap() {
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ty::UpvarCapture::ByValue => {
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bcx = datum.store_to(bcx, upvar_slot_dest);
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}
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ty::UpvarCapture::ByRef(..) => {
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Store(bcx, datum.to_llref(), upvar_slot_dest);
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}
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}
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}
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adt::trans_set_discr(bcx, &*repr, dest_addr, Disr(0));
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Some(bcx)
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}
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pub fn trans_closure_method<'a, 'tcx>(ccx: &'a CrateContext<'a, 'tcx>,
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closure_def_id: DefId,
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substs: ty::ClosureSubsts<'tcx>,
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trait_closure_kind: ty::ClosureKind)
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-> ValueRef
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{
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// If this is a closure, redirect to it.
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let llfn = get_or_create_closure_declaration(ccx, closure_def_id, &substs);
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// If the closure is a Fn closure, but a FnOnce is needed (etc),
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// then adapt the self type
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let closure_kind = ccx.tcx().closure_kind(closure_def_id);
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trans_closure_adapter_shim(ccx,
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closure_def_id,
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substs,
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closure_kind,
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trait_closure_kind,
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llfn)
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}
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fn trans_closure_adapter_shim<'a, 'tcx>(
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ccx: &'a CrateContext<'a, 'tcx>,
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closure_def_id: DefId,
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substs: ty::ClosureSubsts<'tcx>,
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llfn_closure_kind: ty::ClosureKind,
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trait_closure_kind: ty::ClosureKind,
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llfn: ValueRef)
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-> ValueRef
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{
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let _icx = push_ctxt("trans_closure_adapter_shim");
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let tcx = ccx.tcx();
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debug!("trans_closure_adapter_shim(llfn_closure_kind={:?}, \
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trait_closure_kind={:?}, \
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llfn={})",
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llfn_closure_kind,
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trait_closure_kind,
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ccx.tn().val_to_string(llfn));
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match (llfn_closure_kind, trait_closure_kind) {
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(ty::FnClosureKind, ty::FnClosureKind) |
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(ty::FnMutClosureKind, ty::FnMutClosureKind) |
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(ty::FnOnceClosureKind, ty::FnOnceClosureKind) => {
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// No adapter needed.
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llfn
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}
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(ty::FnClosureKind, ty::FnMutClosureKind) => {
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// The closure fn `llfn` is a `fn(&self, ...)`. We want a
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// `fn(&mut self, ...)`. In fact, at trans time, these are
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// basically the same thing, so we can just return llfn.
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llfn
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}
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(ty::FnClosureKind, ty::FnOnceClosureKind) |
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(ty::FnMutClosureKind, ty::FnOnceClosureKind) => {
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// The closure fn `llfn` is a `fn(&self, ...)` or `fn(&mut
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// self, ...)`. We want a `fn(self, ...)`. We can produce
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// this by doing something like:
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//
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// fn call_once(self, ...) { call_mut(&self, ...) }
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// fn call_once(mut self, ...) { call_mut(&mut self, ...) }
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//
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// These are both the same at trans time.
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trans_fn_once_adapter_shim(ccx, closure_def_id, substs, llfn)
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}
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_ => {
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tcx.sess.bug(&format!("trans_closure_adapter_shim: cannot convert {:?} to {:?}",
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llfn_closure_kind,
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trait_closure_kind));
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}
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}
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}
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fn trans_fn_once_adapter_shim<'a, 'tcx>(
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ccx: &'a CrateContext<'a, 'tcx>,
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closure_def_id: DefId,
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substs: ty::ClosureSubsts<'tcx>,
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llreffn: ValueRef)
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-> ValueRef
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{
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debug!("trans_fn_once_adapter_shim(closure_def_id={:?}, substs={:?}, llreffn={})",
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closure_def_id,
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substs,
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ccx.tn().val_to_string(llreffn));
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let tcx = ccx.tcx();
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let infcx = infer::normalizing_infer_ctxt(ccx.tcx(), &ccx.tcx().tables);
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// Find a version of the closure type. Substitute static for the
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// region since it doesn't really matter.
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let closure_ty = tcx.mk_closure_from_closure_substs(closure_def_id, Box::new(substs.clone()));
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let ref_closure_ty = tcx.mk_imm_ref(tcx.mk_region(ty::ReStatic), closure_ty);
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// Make a version with the type of by-ref closure.
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let ty::ClosureTy { unsafety, abi, mut sig } = infcx.closure_type(closure_def_id, &substs);
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sig.0.inputs.insert(0, ref_closure_ty); // sig has no self type as of yet
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let llref_bare_fn_ty = tcx.mk_bare_fn(ty::BareFnTy { unsafety: unsafety,
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abi: abi,
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sig: sig.clone() });
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let llref_fn_ty = tcx.mk_fn(None, llref_bare_fn_ty);
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debug!("trans_fn_once_adapter_shim: llref_fn_ty={:?}",
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llref_fn_ty);
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// Make a version of the closure type with the same arguments, but
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// with argument #0 being by value.
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assert_eq!(abi, RustCall);
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sig.0.inputs[0] = closure_ty;
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let llonce_bare_fn_ty = tcx.mk_bare_fn(ty::BareFnTy { unsafety: unsafety,
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abi: abi,
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sig: sig });
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let llonce_fn_ty = tcx.mk_fn(None, llonce_bare_fn_ty);
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// Create the by-value helper.
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let function_name = link::mangle_internal_name_by_type_and_seq(ccx, llonce_fn_ty, "once_shim");
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let lloncefn = declare::define_internal_rust_fn(ccx, &function_name,
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llonce_fn_ty);
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let sig = tcx.erase_late_bound_regions(&llonce_bare_fn_ty.sig);
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let sig = infer::normalize_associated_type(ccx.tcx(), &sig);
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let (block_arena, fcx): (TypedArena<_>, FunctionContext);
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block_arena = TypedArena::new();
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fcx = new_fn_ctxt(ccx,
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lloncefn,
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ast::DUMMY_NODE_ID,
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false,
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sig.output,
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substs.func_substs,
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None,
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&block_arena);
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let mut bcx = init_function(&fcx, false, sig.output);
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let llargs = get_params(fcx.llfn);
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// the first argument (`self`) will be the (by value) closure env.
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let self_scope = fcx.push_custom_cleanup_scope();
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let self_scope_id = CustomScope(self_scope);
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let rvalue_mode = datum::appropriate_rvalue_mode(ccx, closure_ty);
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let self_idx = fcx.arg_offset();
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let llself = llargs[self_idx];
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let env_datum = Datum::new(llself, closure_ty, Rvalue::new(rvalue_mode));
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let env_datum = unpack_datum!(bcx,
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env_datum.to_lvalue_datum_in_scope(bcx, "self",
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self_scope_id));
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debug!("trans_fn_once_adapter_shim: env_datum={}",
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bcx.val_to_string(env_datum.val));
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let dest =
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fcx.llretslotptr.get().map(
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|_| expr::SaveIn(fcx.get_ret_slot(bcx, sig.output, "ret_slot")));
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let callee_data = TraitItem(MethodData { llfn: llreffn,
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llself: env_datum.val });
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bcx = callee::trans_call_inner(bcx, DebugLoc::None, |bcx, _| {
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Callee {
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bcx: bcx,
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data: callee_data,
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ty: llref_fn_ty
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}
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}, ArgVals(&llargs[(self_idx + 1)..]), dest).bcx;
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fcx.pop_custom_cleanup_scope(self_scope);
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finish_fn(&fcx, bcx, sig.output, DebugLoc::None);
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lloncefn
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}
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