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Avoid adding compiler-used functions to symbols.o

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This commit is contained in:
DianQK 2023-12-03 18:55:42 +08:00
parent 7ceaf19868
commit 9ed0d11efb
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GPG Key ID: 46BDB1AC96C48912
6 changed files with 27 additions and 2 deletions
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2
compiler/rustc_codegen_llvm/src/back/lto.rs
View File

@ -60,7 +60,7 @@ fn prepare_lto(
};
let symbol_filter = &|&(ref name, info): &(String, SymbolExportInfo)| {
if info.level.is_below_threshold(export_threshold) || info.used {
if info.level.is_below_threshold(export_threshold) || info.used || info.used_compiler {
Some(CString::new(name.as_str()).unwrap())
} else {
None

13
compiler/rustc_codegen_ssa/src/back/symbol_export.rs
View File

@ -111,7 +111,7 @@ fn reachable_non_generics_provider(tcx: TyCtxt<'_>, _: LocalCrate) -> DefIdMap<S
let is_builtin_fn = is_compiler_builtins
&& symbol_export_level(tcx, def_id.to_def_id())
.is_below_threshold(SymbolExportLevel::C);
let used = is_builtin_fn || name == "rust_eh_personality";
let used = name == "rust_eh_personality";
let export_level = if special_runtime_crate {
SymbolExportLevel::Rust
@ -138,6 +138,7 @@ fn reachable_non_generics_provider(tcx: TyCtxt<'_>, _: LocalCrate) -> DefIdMap<S
used: codegen_attrs.flags.contains(CodegenFnAttrFlags::USED)
|| codegen_attrs.flags.contains(CodegenFnAttrFlags::USED_LINKER)
|| used,
used_compiler: is_builtin_fn,
};
(def_id.to_def_id(), info)
})
@ -150,6 +151,7 @@ fn reachable_non_generics_provider(tcx: TyCtxt<'_>, _: LocalCrate) -> DefIdMap<S
level: SymbolExportLevel::C,
kind: SymbolExportKind::Data,
used: false,
used_compiler: false,
},
);
}
@ -198,6 +200,7 @@ fn exported_symbols_provider_local(
level: info.level,
kind: SymbolExportKind::Text,
used: info.used,
used_compiler: false,
},
)
})
@ -214,6 +217,7 @@ fn exported_symbols_provider_local(
level: SymbolExportLevel::C,
kind: SymbolExportKind::Text,
used: false,
used_compiler: false,
},
));
}
@ -233,6 +237,7 @@ fn exported_symbols_provider_local(
level: SymbolExportLevel::Rust,
kind: SymbolExportKind::Text,
used: false,
used_compiler: false,
},
));
}
@ -245,6 +250,7 @@ fn exported_symbols_provider_local(
level: SymbolExportLevel::Rust,
kind: SymbolExportKind::Data,
used: false,
used_compiler: false,
},
))
}
@ -264,6 +270,7 @@ fn exported_symbols_provider_local(
level: SymbolExportLevel::C,
kind: SymbolExportKind::Data,
used: false,
used_compiler: false,
},
)
}));
@ -289,6 +296,7 @@ fn exported_symbols_provider_local(
level: SymbolExportLevel::C,
kind: SymbolExportKind::Data,
used: false,
used_compiler: false,
},
)
}));
@ -306,6 +314,7 @@ fn exported_symbols_provider_local(
level: SymbolExportLevel::C,
kind: SymbolExportKind::Data,
used: true,
used_compiler: false,
},
));
}
@ -346,6 +355,7 @@ fn exported_symbols_provider_local(
level: SymbolExportLevel::Rust,
kind: SymbolExportKind::Text,
used: false,
used_compiler: false,
},
));
}
@ -362,6 +372,7 @@ fn exported_symbols_provider_local(
level: SymbolExportLevel::Rust,
kind: SymbolExportKind::Text,
used: false,
used_compiler: false,
},
));
}

5
compiler/rustc_middle/src/middle/exported_symbols.rs
View File

@ -35,7 +35,12 @@ pub enum SymbolExportKind {
pub struct SymbolExportInfo {
pub level: SymbolExportLevel,
pub kind: SymbolExportKind,
/// Used to mark these symbols not to be internalized by LTO. These symbols
/// are also added to `symbols.o` to avoid circular dependencies when linking.
pub used: bool,
/// Also used to mark these symbols not to be internalized by LTO. But will
/// not be added to `symbols.o`. Currently there are only builtin functions.
pub used_compiler: bool,
}
#[derive(Eq, PartialEq, Debug, Copy, Clone, TyEncodable, TyDecodable, HashStable)]

1
src/tools/miri/src/bin/miri.rs
View File

@ -165,6 +165,7 @@ impl rustc_driver::Callbacks for MiriBeRustCompilerCalls {
level: SymbolExportLevel::C,
kind: SymbolExportKind::Text,
used: false,
used_compiler: false,
},
))
}),

7
tests/run-make/no-builtins-symbols/Makefile Normal file
View File

@ -0,0 +1,7 @@
include ../tools.mk
# only-x86_64-unknown-linux-gnu
all:
$(RUSTC) main.rs -o $(TMPDIR)/main
[ "$$("$(LLVM_BIN_DIR)"/llvm-nm -U $(TMPDIR)/main | grep -c __fixunssfti)" -eq "0" ]

1
tests/run-make/no-builtins-symbols/main.rs Normal file
View File

@ -0,0 +1 @@
fn main() {}