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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Type Names for Debug Info.
use super::namespace::crate_root_namespace;
use trans::common::CrateContext;
use middle::def_id::DefId;
use middle::infer;
use middle::subst;
use middle::ty::{self, Ty};
use rustc_front::hir;
// Compute the name of the type as it should be stored in debuginfo. Does not do
// any caching, i.e. calling the function twice with the same type will also do
// the work twice. The `qualified` parameter only affects the first level of the
// type name, further levels (i.e. type parameters) are always fully qualified.
pub fn compute_debuginfo_type_name<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
t: Ty<'tcx>,
qualified: bool)
-> String {
let mut result = String::with_capacity(64);
push_debuginfo_type_name(cx, t, qualified, &mut result);
result
}
// Pushes the name of the type as it should be stored in debuginfo on the
// `output` String. See also compute_debuginfo_type_name().
pub fn push_debuginfo_type_name<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
t: Ty<'tcx>,
qualified: bool,
output: &mut String) {
match t.sty {
ty::TyBool => output.push_str("bool"),
ty::TyChar => output.push_str("char"),
ty::TyStr => output.push_str("str"),
ty::TyInt(int_ty) => output.push_str(int_ty.ty_to_string()),
ty::TyUint(uint_ty) => output.push_str(uint_ty.ty_to_string()),
ty::TyFloat(float_ty) => output.push_str(float_ty.ty_to_string()),
ty::TyStruct(def, substs) |
ty::TyEnum(def, substs) => {
push_item_name(cx, def.did, qualified, output);
push_type_params(cx, substs, output);
},
ty::TyTuple(ref component_types) => {
output.push('(');
for &component_type in component_types {
push_debuginfo_type_name(cx, component_type, true, output);
output.push_str(", ");
}
if !component_types.is_empty() {
output.pop();
output.pop();
}
output.push(')');
},
ty::TyBox(inner_type) => {
output.push_str("Box<");
push_debuginfo_type_name(cx, inner_type, true, output);
output.push('>');
},
ty::TyRawPtr(ty::TypeAndMut { ty: inner_type, mutbl } ) => {
output.push('*');
match mutbl {
hir::MutImmutable => output.push_str("const "),
hir::MutMutable => output.push_str("mut "),
}
push_debuginfo_type_name(cx, inner_type, true, output);
},
ty::TyRef(_, ty::TypeAndMut { ty: inner_type, mutbl }) => {
output.push('&');
if mutbl == hir::MutMutable {
output.push_str("mut ");
}
push_debuginfo_type_name(cx, inner_type, true, output);
},
ty::TyArray(inner_type, len) => {
output.push('[');
push_debuginfo_type_name(cx, inner_type, true, output);
output.push_str(&format!("; {}", len));
output.push(']');
},
ty::TySlice(inner_type) => {
output.push('[');
push_debuginfo_type_name(cx, inner_type, true, output);
output.push(']');
},
ty::TyTrait(ref trait_data) => {
let principal = cx.tcx().erase_late_bound_regions(&trait_data.principal);
push_item_name(cx, principal.def_id, false, output);
push_type_params(cx, principal.substs, 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 != ::syntax::abi::Abi::Rust {
output.push_str("extern \"");
output.push_str(abi.name());
output.push_str("\" ");
}
output.push_str("fn(");
let sig = cx.tcx().erase_late_bound_regions(sig);
let sig = infer::normalize_associated_type(cx.tcx(), &sig);
if !sig.inputs.is_empty() {
for ¶meter_type in &sig.inputs {
push_debuginfo_type_name(cx, parameter_type, true, 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(')');
match sig.output {
ty::FnConverging(result_type) if result_type.is_nil() => {}
ty::FnConverging(result_type) => {
output.push_str(" -> ");
push_debuginfo_type_name(cx, result_type, true, output);
}
ty::FnDiverging => {
output.push_str(" -> !");
}
}
},
ty::TyClosure(..) => {
output.push_str("closure");
}
ty::TyError |
ty::TyInfer(_) |
ty::TyProjection(..) |
ty::TyParam(_) => {
cx.sess().bug(&format!("debuginfo: Trying to create type name for \
unexpected type: {:?}", t));
}
}
fn push_item_name(cx: &CrateContext,
def_id: DefId,
qualified: bool,
output: &mut String) {
cx.tcx().with_path(def_id, |path| {
if qualified {
if def_id.is_local() {
output.push_str(crate_root_namespace(cx));
output.push_str("::");
}
let mut path_element_count = 0;
for path_element in path {
output.push_str(&path_element.name().as_str());
output.push_str("::");
path_element_count += 1;
}
if path_element_count == 0 {
cx.sess().bug("debuginfo: Encountered empty item path!");
}
output.pop();
output.pop();
} else {
let name = path.last().expect("debuginfo: Empty item path?").name();
output.push_str(&name.as_str());
}
});
}
// Pushes the type parameters in the given `Substs` to the output string.
// This ignores region parameters, since they can't reliably be
// reconstructed for items from non-local crates. For local crates, this
// would be possible but with inlining and LTO we have to use the least
// common denominator - otherwise we would run into conflicts.
fn push_type_params<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
substs: &subst::Substs<'tcx>,
output: &mut String) {
if substs.types.is_empty() {
return;
}
output.push('<');
for &type_parameter in &substs.types {
push_debuginfo_type_name(cx, type_parameter, true, output);
output.push_str(", ");
}
output.pop();
output.pop();
output.push('>');
}
}
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