589 lines
22 KiB
Rust
589 lines
22 KiB
Rust
// Copyright 2016 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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//! Walks the crate looking for items/impl-items/trait-items that have
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//! either a `rustc_symbol_name` or `rustc_item_path` attribute and
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//! generates an error giving, respectively, the symbol name or
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//! item-path. This is used for unit testing the code that generates
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//! paths etc in all kinds of annoying scenarios.
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use attributes;
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use base;
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use consts;
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use context::{CrateContext, SharedCrateContext};
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use common;
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use declare;
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use glue::DropGlueKind;
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use llvm;
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use monomorphize::{self, Instance};
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use rustc::dep_graph::DepNode;
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use rustc::hir;
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use rustc::hir::def_id::DefId;
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use rustc::ty::{self, Ty, TyCtxt, TypeFoldable};
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use rustc::ty::subst::Substs;
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use rustc_const_eval::fatal_const_eval_err;
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use syntax::ast::{self, NodeId};
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use syntax::attr;
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use type_of;
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use glue;
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use abi::{Abi, FnType};
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use back::symbol_names;
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use std::fmt::Write;
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use std::iter;
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#[derive(PartialEq, Eq, Clone, Copy, Debug, Hash)]
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pub enum TransItem<'tcx> {
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DropGlue(DropGlueKind<'tcx>),
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Fn(Instance<'tcx>),
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Static(NodeId)
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}
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/// Describes how a translation item will be instantiated in object files.
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#[derive(PartialEq, Eq, Clone, Copy, Debug, Hash)]
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pub enum InstantiationMode {
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/// There will be exactly one instance of the given TransItem. It will have
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/// external linkage so that it can be linked to from other codegen units.
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GloballyShared,
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/// Each codegen unit containing a reference to the given TransItem will
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/// have its own private copy of the function (with internal linkage).
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LocalCopy,
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}
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impl<'a, 'tcx> TransItem<'tcx> {
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pub fn define(&self, ccx: &CrateContext<'a, 'tcx>) {
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debug!("BEGIN IMPLEMENTING '{} ({})' in cgu {}",
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self.to_string(ccx.tcx()),
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self.to_raw_string(),
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ccx.codegen_unit().name());
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// (*) This code executes in the context of a dep-node for the
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// entire CGU. In some cases, we introduce dep-nodes for
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// particular items that we are translating (these nodes will
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// have read edges coming into the CGU node). These smaller
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// nodes are not needed for correctness -- we always
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// invalidate an entire CGU at a time -- but they enable
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// finer-grained testing, since you can write tests that check
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// that the incoming edges to a particular fn are from a
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// particular set.
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match *self {
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TransItem::Static(node_id) => {
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let def_id = ccx.tcx().map.local_def_id(node_id);
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let _task = ccx.tcx().dep_graph.in_task(DepNode::TransCrateItem(def_id)); // (*)
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let item = ccx.tcx().map.expect_item(node_id);
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if let hir::ItemStatic(_, m, _) = item.node {
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match consts::trans_static(&ccx, m, item.id, &item.attrs) {
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Ok(_) => { /* Cool, everything's alright. */ },
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Err(err) => {
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// FIXME: shouldn't this be a `span_err`?
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fatal_const_eval_err(
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ccx.tcx(), &err, item.span, "static");
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}
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};
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} else {
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span_bug!(item.span, "Mismatch between hir::Item type and TransItem type")
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}
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}
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TransItem::Fn(instance) => {
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let _task = ccx.tcx().dep_graph.in_task(
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DepNode::TransCrateItem(instance.def)); // (*)
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base::trans_instance(&ccx, instance);
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}
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TransItem::DropGlue(dg) => {
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glue::implement_drop_glue(&ccx, dg);
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}
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}
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debug!("END IMPLEMENTING '{} ({})' in cgu {}",
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self.to_string(ccx.tcx()),
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self.to_raw_string(),
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ccx.codegen_unit().name());
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}
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pub fn predefine(&self,
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ccx: &CrateContext<'a, 'tcx>,
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linkage: llvm::Linkage) {
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debug!("BEGIN PREDEFINING '{} ({})' in cgu {}",
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self.to_string(ccx.tcx()),
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self.to_raw_string(),
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ccx.codegen_unit().name());
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let symbol_name = ccx.symbol_map()
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.get_or_compute(ccx.shared(), *self);
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debug!("symbol {}", &symbol_name);
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match *self {
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TransItem::Static(node_id) => {
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TransItem::predefine_static(ccx, node_id, linkage, &symbol_name);
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}
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TransItem::Fn(instance) => {
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TransItem::predefine_fn(ccx, instance, linkage, &symbol_name);
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}
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TransItem::DropGlue(dg) => {
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TransItem::predefine_drop_glue(ccx, dg, linkage, &symbol_name);
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}
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}
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debug!("END PREDEFINING '{} ({})' in cgu {}",
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self.to_string(ccx.tcx()),
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self.to_raw_string(),
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ccx.codegen_unit().name());
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}
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fn predefine_static(ccx: &CrateContext<'a, 'tcx>,
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node_id: ast::NodeId,
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linkage: llvm::Linkage,
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symbol_name: &str) {
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let def_id = ccx.tcx().map.local_def_id(node_id);
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let ty = ccx.tcx().item_type(def_id);
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let llty = type_of::type_of(ccx, ty);
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let g = declare::define_global(ccx, symbol_name, llty).unwrap_or_else(|| {
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ccx.sess().span_fatal(ccx.tcx().map.span(node_id),
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&format!("symbol `{}` is already defined", symbol_name))
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});
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unsafe { llvm::LLVMRustSetLinkage(g, linkage) };
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let instance = Instance::mono(ccx.shared(), def_id);
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ccx.instances().borrow_mut().insert(instance, g);
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ccx.statics().borrow_mut().insert(g, def_id);
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}
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fn predefine_fn(ccx: &CrateContext<'a, 'tcx>,
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instance: Instance<'tcx>,
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linkage: llvm::Linkage,
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symbol_name: &str) {
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assert!(!instance.substs.needs_infer() &&
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!instance.substs.has_param_types());
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let item_ty = ccx.tcx().item_type(instance.def);
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let item_ty = ccx.tcx().erase_regions(&item_ty);
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let mono_ty = monomorphize::apply_param_substs(ccx.shared(), instance.substs, &item_ty);
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let attrs = ccx.tcx().get_attrs(instance.def);
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let lldecl = declare::declare_fn(ccx, symbol_name, mono_ty);
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unsafe { llvm::LLVMRustSetLinkage(lldecl, linkage) };
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base::set_link_section(ccx, lldecl, &attrs);
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if linkage == llvm::Linkage::LinkOnceODRLinkage ||
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linkage == llvm::Linkage::WeakODRLinkage {
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llvm::SetUniqueComdat(ccx.llmod(), lldecl);
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}
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if let ty::TyClosure(..) = mono_ty.sty {
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// set an inline hint for all closures
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attributes::inline(lldecl, attributes::InlineAttr::Hint);
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}
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attributes::from_fn_attrs(ccx, &attrs, lldecl);
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ccx.instances().borrow_mut().insert(instance, lldecl);
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}
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fn predefine_drop_glue(ccx: &CrateContext<'a, 'tcx>,
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dg: glue::DropGlueKind<'tcx>,
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linkage: llvm::Linkage,
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symbol_name: &str) {
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let tcx = ccx.tcx();
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assert_eq!(dg.ty(), glue::get_drop_glue_type(ccx.shared(), dg.ty()));
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let t = dg.ty();
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let sig = tcx.mk_fn_sig(iter::once(tcx.mk_mut_ptr(t)), tcx.mk_nil(), false);
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debug!("predefine_drop_glue: sig={}", sig);
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let fn_ty = FnType::new(ccx, Abi::Rust, &sig, &[]);
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let llfnty = fn_ty.llvm_type(ccx);
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assert!(declare::get_defined_value(ccx, symbol_name).is_none());
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let llfn = declare::declare_cfn(ccx, symbol_name, llfnty);
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unsafe { llvm::LLVMRustSetLinkage(llfn, linkage) };
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if linkage == llvm::Linkage::LinkOnceODRLinkage ||
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linkage == llvm::Linkage::WeakODRLinkage {
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llvm::SetUniqueComdat(ccx.llmod(), llfn);
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}
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attributes::set_frame_pointer_elimination(ccx, llfn);
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ccx.drop_glues().borrow_mut().insert(dg, (llfn, fn_ty));
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}
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pub fn compute_symbol_name(&self,
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scx: &SharedCrateContext<'a, 'tcx>) -> String {
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match *self {
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TransItem::Fn(instance) => instance.symbol_name(scx),
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TransItem::Static(node_id) => {
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let def_id = scx.tcx().map.local_def_id(node_id);
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Instance::mono(scx, def_id).symbol_name(scx)
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}
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TransItem::DropGlue(dg) => {
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let prefix = match dg {
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DropGlueKind::Ty(_) => "drop",
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DropGlueKind::TyContents(_) => "drop_contents",
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};
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symbol_names::exported_name_from_type_and_prefix(scx, dg.ty(), prefix)
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}
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}
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}
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pub fn is_from_extern_crate(&self) -> bool {
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match *self {
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TransItem::Fn(ref instance) => !instance.def.is_local(),
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TransItem::DropGlue(..) |
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TransItem::Static(..) => false,
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}
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}
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pub fn instantiation_mode(&self,
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tcx: TyCtxt<'a, 'tcx, 'tcx>)
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-> InstantiationMode {
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match *self {
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TransItem::Fn(ref instance) => {
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if self.explicit_linkage(tcx).is_none() &&
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(common::is_closure(tcx, instance.def) ||
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attr::requests_inline(&tcx.get_attrs(instance.def)[..])) {
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InstantiationMode::LocalCopy
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} else {
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InstantiationMode::GloballyShared
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}
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}
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TransItem::DropGlue(..) => InstantiationMode::LocalCopy,
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TransItem::Static(..) => InstantiationMode::GloballyShared,
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}
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}
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pub fn is_generic_fn(&self) -> bool {
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match *self {
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TransItem::Fn(ref instance) => {
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instance.substs.types().next().is_some()
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}
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TransItem::DropGlue(..) |
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TransItem::Static(..) => false,
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}
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}
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pub fn explicit_linkage(&self, tcx: TyCtxt<'a, 'tcx, 'tcx>) -> Option<llvm::Linkage> {
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let def_id = match *self {
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TransItem::Fn(ref instance) => instance.def,
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TransItem::Static(node_id) => tcx.map.local_def_id(node_id),
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TransItem::DropGlue(..) => return None,
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};
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let attributes = tcx.get_attrs(def_id);
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if let Some(name) = attr::first_attr_value_str_by_name(&attributes, "linkage") {
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if let Some(linkage) = base::llvm_linkage_by_name(&name.as_str()) {
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Some(linkage)
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} else {
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let span = tcx.map.span_if_local(def_id);
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if let Some(span) = span {
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tcx.sess.span_fatal(span, "invalid linkage specified")
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} else {
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tcx.sess.fatal(&format!("invalid linkage specified: {}", name))
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}
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}
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} else {
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None
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}
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}
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pub fn to_string(&self, tcx: TyCtxt<'a, 'tcx, 'tcx>) -> String {
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let hir_map = &tcx.map;
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return match *self {
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TransItem::DropGlue(dg) => {
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let mut s = String::with_capacity(32);
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match dg {
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DropGlueKind::Ty(_) => s.push_str("drop-glue "),
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DropGlueKind::TyContents(_) => s.push_str("drop-glue-contents "),
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};
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let printer = DefPathBasedNames::new(tcx, false, false);
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printer.push_type_name(dg.ty(), &mut s);
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s
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}
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TransItem::Fn(instance) => {
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to_string_internal(tcx, "fn ", instance)
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},
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TransItem::Static(node_id) => {
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let def_id = hir_map.local_def_id(node_id);
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let instance = Instance::new(def_id, tcx.intern_substs(&[]));
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to_string_internal(tcx, "static ", instance)
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},
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};
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fn to_string_internal<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
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prefix: &str,
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instance: Instance<'tcx>)
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-> String {
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let mut result = String::with_capacity(32);
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result.push_str(prefix);
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let printer = DefPathBasedNames::new(tcx, false, false);
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printer.push_instance_as_string(instance, &mut result);
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result
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}
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}
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pub fn to_raw_string(&self) -> String {
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match *self {
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TransItem::DropGlue(dg) => {
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let prefix = match dg {
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DropGlueKind::Ty(_) => "Ty",
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DropGlueKind::TyContents(_) => "TyContents",
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};
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format!("DropGlue({}: {})", prefix, dg.ty() as *const _ as usize)
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}
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TransItem::Fn(instance) => {
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format!("Fn({:?}, {})",
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instance.def,
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instance.substs.as_ptr() as usize)
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}
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TransItem::Static(id) => {
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format!("Static({:?})", id)
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}
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}
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}
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}
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//=-----------------------------------------------------------------------------
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// TransItem String Keys
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//=-----------------------------------------------------------------------------
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// The code below allows for producing a unique string key for a trans item.
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// These keys are used by the handwritten auto-tests, so they need to be
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// predictable and human-readable.
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//
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// Note: A lot of this could looks very similar to what's already in the
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// ppaux module. It would be good to refactor things so we only have one
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// parameterizable implementation for printing types.
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/// Same as `unique_type_name()` but with the result pushed onto the given
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/// `output` parameter.
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pub struct DefPathBasedNames<'a, 'tcx: 'a> {
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tcx: TyCtxt<'a, 'tcx, 'tcx>,
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omit_disambiguators: bool,
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omit_local_crate_name: bool,
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}
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impl<'a, 'tcx> DefPathBasedNames<'a, 'tcx> {
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pub fn new(tcx: TyCtxt<'a, 'tcx, 'tcx>,
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omit_disambiguators: bool,
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omit_local_crate_name: bool)
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-> Self {
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DefPathBasedNames {
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tcx: tcx,
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omit_disambiguators: omit_disambiguators,
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omit_local_crate_name: omit_local_crate_name,
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}
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}
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pub fn push_type_name(&self, t: Ty<'tcx>, output: &mut String) {
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match t.sty {
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ty::TyBool => output.push_str("bool"),
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ty::TyChar => output.push_str("char"),
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ty::TyStr => output.push_str("str"),
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ty::TyNever => output.push_str("!"),
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ty::TyInt(ast::IntTy::Is) => output.push_str("isize"),
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ty::TyInt(ast::IntTy::I8) => output.push_str("i8"),
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ty::TyInt(ast::IntTy::I16) => output.push_str("i16"),
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ty::TyInt(ast::IntTy::I32) => output.push_str("i32"),
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ty::TyInt(ast::IntTy::I64) => output.push_str("i64"),
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ty::TyInt(ast::IntTy::I128) => output.push_str("i128"),
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ty::TyUint(ast::UintTy::Us) => output.push_str("usize"),
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ty::TyUint(ast::UintTy::U8) => output.push_str("u8"),
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ty::TyUint(ast::UintTy::U16) => output.push_str("u16"),
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ty::TyUint(ast::UintTy::U32) => output.push_str("u32"),
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ty::TyUint(ast::UintTy::U64) => output.push_str("u64"),
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ty::TyUint(ast::UintTy::U128) => output.push_str("u128"),
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ty::TyFloat(ast::FloatTy::F32) => output.push_str("f32"),
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ty::TyFloat(ast::FloatTy::F64) => output.push_str("f64"),
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ty::TyAdt(adt_def, substs) => {
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self.push_def_path(adt_def.did, output);
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self.push_type_params(substs, iter::empty(), output);
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},
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ty::TyTuple(component_types) => {
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output.push('(');
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for &component_type in component_types {
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self.push_type_name(component_type, output);
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output.push_str(", ");
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}
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if !component_types.is_empty() {
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output.pop();
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output.pop();
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}
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output.push(')');
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},
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ty::TyBox(inner_type) => {
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output.push_str("Box<");
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self.push_type_name(inner_type, output);
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output.push('>');
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},
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ty::TyRawPtr(ty::TypeAndMut { ty: inner_type, mutbl } ) => {
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output.push('*');
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match mutbl {
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hir::MutImmutable => output.push_str("const "),
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hir::MutMutable => output.push_str("mut "),
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}
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self.push_type_name(inner_type, output);
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},
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ty::TyRef(_, ty::TypeAndMut { ty: inner_type, mutbl }) => {
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output.push('&');
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if mutbl == hir::MutMutable {
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output.push_str("mut ");
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}
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self.push_type_name(inner_type, output);
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},
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ty::TyArray(inner_type, len) => {
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output.push('[');
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self.push_type_name(inner_type, output);
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write!(output, "; {}", len).unwrap();
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output.push(']');
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},
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ty::TySlice(inner_type) => {
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output.push('[');
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self.push_type_name(inner_type, output);
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output.push(']');
|
|
},
|
|
ty::TyDynamic(ref trait_data, ..) => {
|
|
if let Some(principal) = trait_data.principal() {
|
|
self.push_def_path(principal.def_id(), output);
|
|
self.push_type_params(principal.skip_binder().substs,
|
|
trait_data.projection_bounds(),
|
|
output);
|
|
}
|
|
},
|
|
ty::TyFnDef(.., &ty::BareFnTy{ unsafety, abi, ref sig } ) |
|
|
ty::TyFnPtr(&ty::BareFnTy{ unsafety, abi, ref sig } ) => {
|
|
if unsafety == hir::Unsafety::Unsafe {
|
|
output.push_str("unsafe ");
|
|
}
|
|
|
|
if abi != ::abi::Abi::Rust {
|
|
output.push_str("extern \"");
|
|
output.push_str(abi.name());
|
|
output.push_str("\" ");
|
|
}
|
|
|
|
output.push_str("fn(");
|
|
|
|
let sig = self.tcx.erase_late_bound_regions_and_normalize(sig);
|
|
|
|
if !sig.inputs().is_empty() {
|
|
for ¶meter_type in sig.inputs() {
|
|
self.push_type_name(parameter_type, output);
|
|
output.push_str(", ");
|
|
}
|
|
output.pop();
|
|
output.pop();
|
|
}
|
|
|
|
if sig.variadic {
|
|
if !sig.inputs().is_empty() {
|
|
output.push_str(", ...");
|
|
} else {
|
|
output.push_str("...");
|
|
}
|
|
}
|
|
|
|
output.push(')');
|
|
|
|
if !sig.output().is_nil() {
|
|
output.push_str(" -> ");
|
|
self.push_type_name(sig.output(), output);
|
|
}
|
|
},
|
|
ty::TyClosure(def_id, ref closure_substs) => {
|
|
self.push_def_path(def_id, output);
|
|
let generics = self.tcx.item_generics(self.tcx.closure_base_def_id(def_id));
|
|
let substs = closure_substs.substs.truncate_to(self.tcx, generics);
|
|
self.push_type_params(substs, iter::empty(), output);
|
|
}
|
|
ty::TyError |
|
|
ty::TyInfer(_) |
|
|
ty::TyProjection(..) |
|
|
ty::TyParam(_) |
|
|
ty::TyAnon(..) => {
|
|
bug!("DefPathBasedNames: Trying to create type name for \
|
|
unexpected type: {:?}", t);
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn push_def_path(&self,
|
|
def_id: DefId,
|
|
output: &mut String) {
|
|
let def_path = self.tcx.def_path(def_id);
|
|
|
|
// some_crate::
|
|
if !(self.omit_local_crate_name && def_id.is_local()) {
|
|
output.push_str(&self.tcx.crate_name(def_path.krate).as_str());
|
|
output.push_str("::");
|
|
}
|
|
|
|
// foo::bar::ItemName::
|
|
for part in self.tcx.def_path(def_id).data {
|
|
if self.omit_disambiguators {
|
|
write!(output, "{}::", part.data.as_interned_str()).unwrap();
|
|
} else {
|
|
write!(output, "{}[{}]::",
|
|
part.data.as_interned_str(),
|
|
part.disambiguator).unwrap();
|
|
}
|
|
}
|
|
|
|
// remove final "::"
|
|
output.pop();
|
|
output.pop();
|
|
}
|
|
|
|
fn push_type_params<I>(&self,
|
|
substs: &Substs<'tcx>,
|
|
projections: I,
|
|
output: &mut String)
|
|
where I: Iterator<Item=ty::PolyExistentialProjection<'tcx>>
|
|
{
|
|
let mut projections = projections.peekable();
|
|
if substs.types().next().is_none() && projections.peek().is_none() {
|
|
return;
|
|
}
|
|
|
|
output.push('<');
|
|
|
|
for type_parameter in substs.types() {
|
|
self.push_type_name(type_parameter, output);
|
|
output.push_str(", ");
|
|
}
|
|
|
|
for projection in projections {
|
|
let projection = projection.skip_binder();
|
|
let name = &projection.item_name.as_str();
|
|
output.push_str(name);
|
|
output.push_str("=");
|
|
self.push_type_name(projection.ty, output);
|
|
output.push_str(", ");
|
|
}
|
|
|
|
output.pop();
|
|
output.pop();
|
|
|
|
output.push('>');
|
|
}
|
|
|
|
pub fn push_instance_as_string(&self,
|
|
instance: Instance<'tcx>,
|
|
output: &mut String) {
|
|
self.push_def_path(instance.def, output);
|
|
self.push_type_params(instance.substs, iter::empty(), output);
|
|
}
|
|
}
|