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Rollup merge of #63559 - eddyb:v0-mangling-off-by-1, r=estebank

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rustc_codegen_utils: account for 1-indexed anonymous lifetimes in v0 mangling.

I don't really understand why `anonymize_late_bound_regions` starts with `BrAnon(1)` instead of `BrAnon(0)`, but it does (maybe @nikomatsakis knows?): c43d03a19f/src/librustc/ty/fold.rs (L696-L712)

Thankfully, the mangling format and demangler implementations are fine, and I just needed to offset the anonymized lifetime indices by `1` to get the correct mangling.

cc @alexcrichton @michaelwoerister
This commit is contained in:
Mazdak Farrokhzad 2019-08-17 11:13:45 +02:00 committed by GitHub
commit a053baefeb
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3 changed files with 16 additions and 8 deletions
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12
src/librustc_codegen_utils/symbol_names/v0.rs
View File

@ -198,10 +198,14 @@ impl SymbolMangler<'tcx> {
let lifetimes = regions.into_iter().map(|br| {
match br {
ty::BrAnon(i) => i + 1,
ty::BrAnon(i) => {
// FIXME(eddyb) for some reason, `anonymize_late_bound_regions` starts at `1`.
assert_ne!(i, 0);
i - 1
},
_ => bug!("symbol_names: non-anonymized region `{:?}` in `{:?}`", br, value),
}
}).max().unwrap_or(0);
}).max().map_or(0, |max| max + 1);
self.push_opt_integer_62("G", lifetimes as u64);
lifetime_depths.end += lifetimes;
@ -297,6 +301,10 @@ impl Printer<'tcx> for SymbolMangler<'tcx> {
// Late-bound lifetimes use indices starting at 1,
// see `BinderLevel` for more details.
ty::ReLateBound(debruijn, ty::BrAnon(i)) => {
// FIXME(eddyb) for some reason, `anonymize_late_bound_regions` starts at `1`.
assert_ne!(i, 0);
let i = i - 1;
let binder = &self.binders[self.binders.len() - 1 - debruijn.index()];
let depth = binder.lifetime_depths.start + i;

6
src/test/ui/symbol-names/impl1.rs
View File

@ -64,9 +64,9 @@ fn main() {
//[legacy]~^ ERROR symbol-name(_ZN198_$LT$$u5b$$RF$dyn$u20$impl1..Foo$u2b$Assoc$u20$$u3d$$u20$extern$u20$$u22$C$u22$$u20$fn$LP$$RF$u8$RP$$u2b$impl1..AutoTrait$u3b$$u20$_$u5d$$u20$as$u20$impl1..main..$u7b$$u7b$closure$u7d$$u7d$..Bar$GT$6method
//[legacy]~| ERROR demangling(<[&dyn impl1::Foo+Assoc = extern "C" fn(&u8)+impl1::AutoTrait; _] as impl1::main::{{closure}}::Bar>::method
//[legacy]~| ERROR demangling-alt(<[&dyn impl1::Foo+Assoc = extern "C" fn(&u8)+impl1::AutoTrait; _] as impl1::main::{{closure}}::Bar>::method)
//[v0]~^^^^ ERROR symbol-name(_RNvXNCNvCs4fqI2P2rA04_5impl14mains_0ARDNtB6_3Foop5AssocFG0_KCRL0_hEuNtB6_9AutoTraitEL_j3_NtB2_3Bar6method)
//[v0]~| ERROR demangling(<[&dyn impl1[317d481089b8c8fe]::Foo<Assoc = for<'a, 'b> extern "C" fn(&'b u8)> + impl1[317d481089b8c8fe]::AutoTrait; 3: usize] as impl1[317d481089b8c8fe]::main::{closure#1}::Bar>::method)
//[v0]~| ERROR demangling-alt(<[&dyn impl1::Foo<Assoc = for<'a, 'b> extern "C" fn(&'b u8)> + impl1::AutoTrait; 3] as impl1::main::{closure#1}::Bar>::method)
//[v0]~^^^^ ERROR symbol-name(_RNvXNCNvCs4fqI2P2rA04_5impl14mains_0ARDNtB6_3Foop5AssocFG_KCRL0_hEuNtB6_9AutoTraitEL_j3_NtB2_3Bar6method)
//[v0]~| ERROR demangling(<[&dyn impl1[317d481089b8c8fe]::Foo<Assoc = for<'a> extern "C" fn(&'a u8)> + impl1[317d481089b8c8fe]::AutoTrait; 3: usize] as impl1[317d481089b8c8fe]::main::{closure#1}::Bar>::method)
//[v0]~| ERROR demangling-alt(<[&dyn impl1::Foo<Assoc = for<'a> extern "C" fn(&'a u8)> + impl1::AutoTrait; 3] as impl1::main::{closure#1}::Bar>::method)
#[rustc_def_path]
//[legacy]~^ ERROR def-path(<[&dyn Foo<Assoc = for<'r> extern "C" fn(&'r u8)> + AutoTrait; _] as main::{{closure}}#1::Bar>::method)
//[v0]~^^ ERROR def-path(<[&dyn Foo<Assoc = for<'r> extern "C" fn(&'r u8)> + AutoTrait; _] as main::{{closure}}#1::Bar>::method)

6
src/test/ui/symbol-names/impl1.v0.stderr
View File

@ -46,19 +46,19 @@ error: def-path(bar::<impl foo::Foo>::baz)
LL | #[rustc_def_path]
| ^^^^^^^^^^^^^^^^^
error: symbol-name(_RNvXNCNvCs4fqI2P2rA04_5impl14mains_0ARDNtB6_3Foop5AssocFG0_KCRL0_hEuNtB6_9AutoTraitEL_j3_NtB2_3Bar6method)
error: symbol-name(_RNvXNCNvCs4fqI2P2rA04_5impl14mains_0ARDNtB6_3Foop5AssocFG_KCRL0_hEuNtB6_9AutoTraitEL_j3_NtB2_3Bar6method)
--> $DIR/impl1.rs:63:13
|
LL | #[rustc_symbol_name]
| ^^^^^^^^^^^^^^^^^^^^
error: demangling(<[&dyn impl1[317d481089b8c8fe]::Foo<Assoc = for<'a, 'b> extern "C" fn(&'b u8)> + impl1[317d481089b8c8fe]::AutoTrait; 3: usize] as impl1[317d481089b8c8fe]::main::{closure#1}::Bar>::method)
error: demangling(<[&dyn impl1[317d481089b8c8fe]::Foo<Assoc = for<'a> extern "C" fn(&'a u8)> + impl1[317d481089b8c8fe]::AutoTrait; 3: usize] as impl1[317d481089b8c8fe]::main::{closure#1}::Bar>::method)
--> $DIR/impl1.rs:63:13
|
LL | #[rustc_symbol_name]
| ^^^^^^^^^^^^^^^^^^^^
error: demangling-alt(<[&dyn impl1::Foo<Assoc = for<'a, 'b> extern "C" fn(&'b u8)> + impl1::AutoTrait; 3] as impl1::main::{closure#1}::Bar>::method)
error: demangling-alt(<[&dyn impl1::Foo<Assoc = for<'a> extern "C" fn(&'a u8)> + impl1::AutoTrait; 3] as impl1::main::{closure#1}::Bar>::method)
--> $DIR/impl1.rs:63:13
|
LL | #[rustc_symbol_name]