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Include InstanceDef's discriminant in the symbol hash.

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This commit is contained in:
Masaki Hara 2018-09-27 00:14:38 +09:00
parent 609cc26d31
commit 2075316064
3 changed files with 7 additions and 5 deletions
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6
src/librustc_codegen_utils/symbol_names.rs
View File

@ -114,6 +114,7 @@ use rustc_mir::monomorphize::Instance;
use syntax_pos::symbol::Symbol;
use std::fmt::Write;
use std::mem::discriminant;
pub fn provide(providers: &mut Providers) {
*providers = Providers {
@ -220,8 +221,9 @@ fn get_symbol_hash<'a, 'tcx>(
(&tcx.crate_disambiguator(instantiating_crate)).hash_stable(&mut hcx, &mut hasher);
}
let is_vtable_shim = instance.is_vtable_shim();
is_vtable_shim.hash_stable(&mut hcx, &mut hasher);
// We want to avoid accidental collision between different types of instances.
// Especially, VtableShim may overlap with its original instance without this.
discriminant(&instance.def).hash_stable(&mut hcx, &mut hasher);
});
// 64 bits should be enough to avoid collisions.

2
src/test/ui/symbol-names/basic.stderr
View File

@ -1,4 +1,4 @@
error: symbol-name(_ZN5basic4main17h6ab1850bb0b9f417E)
error: symbol-name(_ZN5basic4main17h08bcaf310214ed52E)
--> $DIR/basic.rs:13:1
|
LL | #[rustc_symbol_name] //~ ERROR _ZN5basic4main

4
src/test/ui/symbol-names/impl1.stderr
View File

@ -1,4 +1,4 @@
error: symbol-name(_ZN5impl13foo3Foo3bar17h99c48478d64a0eb0E)
error: symbol-name(_ZN5impl13foo3Foo3bar17hc487d6ec13fe9124E)
--> $DIR/impl1.rs:18:9
|
LL | #[rustc_symbol_name] //~ ERROR _ZN5impl13foo3Foo3bar
@ -10,7 +10,7 @@ error: item-path(foo::Foo::bar)
LL | #[rustc_item_path] //~ ERROR item-path(foo::Foo::bar)
| ^^^^^^^^^^^^^^^^^^
error: symbol-name(_ZN5impl13bar33_$LT$impl$u20$impl1..foo..Foo$GT$3baz17hebf13830acf865d9E)
error: symbol-name(_ZN5impl13bar33_$LT$impl$u20$impl1..foo..Foo$GT$3baz17h38577281258e1527E)
--> $DIR/impl1.rs:28:9
|
LL | #[rustc_symbol_name] //~ ERROR _ZN5impl13bar33_$LT$impl$u20$impl1..foo..Foo$GT$3baz