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Auto merge of #99944 - bjorn3:hide_proc_macro_symbols, r=eddyb
Limit symbols exported from proc macros Only `__rustc_proc_macro_decls_*__` and `rust_metadata_*` need to be exported for proc macros to work. All other symbols only increase binary size and have the potential to conflict with symbols from the host compiler. Fixes https://github.com/rust-lang/rust/issues/99909 Fixes #59998 cc `@eddyb`
This commit is contained in:
commit
25bb1c13bd
@ -656,9 +656,7 @@ impl<'a> Linker for GccLinker<'a> {
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return;
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}
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if crate_type == CrateType::ProcMacro {
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return;
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}
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// FIXME(#99978) hide #[no_mangle] symbols for proc-macros
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let is_windows = self.sess.target.is_like_windows;
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let path = tmpdir.join(if is_windows { "list.def" } else { "list" });
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@ -257,16 +257,18 @@ fn exported_symbols_provider_local<'tcx>(
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}));
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}
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if tcx.sess.crate_types().contains(&CrateType::Dylib) {
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if tcx.sess.crate_types().contains(&CrateType::Dylib)
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|| tcx.sess.crate_types().contains(&CrateType::ProcMacro)
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{
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let symbol_name = metadata_symbol_name(tcx);
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let exported_symbol = ExportedSymbol::NoDefId(SymbolName::new(tcx, &symbol_name));
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symbols.push((
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exported_symbol,
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SymbolExportInfo {
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level: SymbolExportLevel::Rust,
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level: SymbolExportLevel::C,
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kind: SymbolExportKind::Data,
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used: false,
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used: true,
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},
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));
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}
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@ -5,6 +5,7 @@ include ../tools.mk
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NM=nm -D
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CDYLIB_NAME=liba_cdylib.so
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RDYLIB_NAME=liba_rust_dylib.so
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PROC_MACRO_NAME=liba_proc_macro.so
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EXE_NAME=an_executable
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COMBINED_CDYLIB_NAME=libcombined_rlib_dylib.so
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@ -12,6 +13,7 @@ ifeq ($(UNAME),Darwin)
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NM=nm -gU
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CDYLIB_NAME=liba_cdylib.dylib
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RDYLIB_NAME=liba_rust_dylib.dylib
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PROC_MACRO_NAME=liba_proc_macro.dylib
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EXE_NAME=an_executable
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COMBINED_CDYLIB_NAME=libcombined_rlib_dylib.dylib
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endif
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@ -20,6 +22,7 @@ ifdef IS_WINDOWS
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NM=nm -g
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CDYLIB_NAME=liba_cdylib.dll.a
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RDYLIB_NAME=liba_rust_dylib.dll.a
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PROC_MACRO_NAME=liba_proc_macro.dll
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EXE_NAME=an_executable.exe
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COMBINED_CDYLIB_NAME=libcombined_rlib_dylib.dll.a
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endif
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@ -31,6 +34,7 @@ all:
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$(RUSTC) -Zshare-generics=no an_rlib.rs
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$(RUSTC) -Zshare-generics=no a_cdylib.rs
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$(RUSTC) -Zshare-generics=no a_rust_dylib.rs
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$(RUSTC) -Zshare-generics=no a_proc_macro.rs
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$(RUSTC) -Zshare-generics=no an_executable.rs
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$(RUSTC) -Zshare-generics=no a_cdylib.rs --crate-name combined_rlib_dylib --crate-type=rlib,cdylib
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@ -54,6 +58,14 @@ all:
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# Check that a Rust dylib does not export generics if -Zshare-generics=no
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[ "$$($(NM) $(TMPDIR)/$(RDYLIB_NAME) | grep -v __imp_ | grep -c public_generic_function_from_rlib)" -eq "0" ]
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# Check that a proc macro exports its public #[no_mangle] functions
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# FIXME(#99978) avoid exporting #[no_mangle] symbols for proc macros
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[ "$$($(NM) $(TMPDIR)/$(CDYLIB_NAME) | grep -v __imp_ | grep -c public_c_function_from_cdylib)" -eq "1" ]
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# Check that a proc macro exports the public #[no_mangle] functions of dependencies
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[ "$$($(NM) $(TMPDIR)/$(CDYLIB_NAME) | grep -v __imp_ | grep -c public_c_function_from_rlib)" -eq "1" ]
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# Check that a proc macro DOES NOT export any public Rust functions
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[ "$$($(NM) $(TMPDIR)/$(CDYLIB_NAME) | grep -v __imp_ | grep -c $(RE_ANY_RUST_SYMBOL))" -eq "0" ]
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# FIXME(nbdd0121): This is broken in MinGW, see https://github.com/rust-lang/rust/pull/95604#issuecomment-1101564032
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ifndef IS_WINDOWS
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# Check that an executable does not export any dynamic symbols
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@ -75,6 +87,7 @@ endif
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$(RUSTC) -Zshare-generics=yes an_rlib.rs
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$(RUSTC) -Zshare-generics=yes a_cdylib.rs
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$(RUSTC) -Zshare-generics=yes a_rust_dylib.rs
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$(RUSTC) -Zshare-generics=yes a_proc_macro.rs
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$(RUSTC) -Zshare-generics=yes an_executable.rs
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# Check that a cdylib exports its public #[no_mangle] functions
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@ -94,6 +107,14 @@ endif
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[ "$$($(NM) $(TMPDIR)/$(RDYLIB_NAME) | grep -v __imp_ | grep -c public_rust_function_from_rlib)" -eq "1" ]
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[ "$$($(NM) $(TMPDIR)/$(RDYLIB_NAME) | grep -v __imp_ | grep -c public_generic_function_from_rlib)" -eq "1" ]
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# Check that a proc macro exports its public #[no_mangle] functions
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# FIXME(#99978) avoid exporting #[no_mangle] symbols for proc macros
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[ "$$($(NM) $(TMPDIR)/$(CDYLIB_NAME) | grep -v __imp_ | grep -c public_c_function_from_cdylib)" -eq "1" ]
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# Check that a proc macro exports the public #[no_mangle] functions of dependencies
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[ "$$($(NM) $(TMPDIR)/$(CDYLIB_NAME) | grep -v __imp_ | grep -c public_c_function_from_rlib)" -eq "1" ]
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# Check that a proc macro DOES NOT export any public Rust functions
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[ "$$($(NM) $(TMPDIR)/$(CDYLIB_NAME) | grep -v __imp_ | grep -c $(RE_ANY_RUST_SYMBOL))" -eq "0" ]
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ifndef IS_WINDOWS
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# Check that an executable does not export any dynamic symbols
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[ "$$($(NM) $(TMPDIR)/$(EXE_NAME) | grep -v __imp_ | grep -c public_c_function_from_rlib)" -eq "0" ]
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@ -0,0 +1,9 @@
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#![crate_type = "proc-macro"]
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extern crate an_rlib;
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// This should not be exported
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#[no_mangle]
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extern "C" fn public_c_function_from_cdylib() {
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an_rlib::public_c_function_from_rlib();
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}
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@ -1,9 +1,4 @@
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// aux-build:invalid-punct-ident.rs
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// ignore-stage1
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// only-linux
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//
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// FIXME: This should be a normal (stage1, all platforms) test in
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// src/test/ui/proc-macro once issue #59998 is fixed.
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#[macro_use]
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extern crate invalid_punct_ident;
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@ -1,5 +1,5 @@
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error: proc macro panicked
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--> $DIR/invalid-punct-ident-1.rs:11:1
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--> $DIR/invalid-punct-ident-1.rs:6:1
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LL | invalid_punct!();
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| ^^^^^^^^^^^^^^^^
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@ -1,9 +1,4 @@
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// aux-build:invalid-punct-ident.rs
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// ignore-stage1
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// only-linux
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//
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// FIXME: This should be a normal (stage1, all platforms) test in
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// src/test/ui/proc-macro once issue #59998 is fixed.
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#[macro_use]
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extern crate invalid_punct_ident;
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@ -1,5 +1,5 @@
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error: proc macro panicked
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--> $DIR/invalid-punct-ident-2.rs:11:1
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--> $DIR/invalid-punct-ident-2.rs:6:1
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LL | invalid_ident!();
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| ^^^^^^^^^^^^^^^^
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@ -1,9 +1,4 @@
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// aux-build:invalid-punct-ident.rs
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// ignore-stage1
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// only-linux
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//
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// FIXME: This should be a normal (stage1, all platforms) test in
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// src/test/ui/proc-macro once issue #59998 is fixed.
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#[macro_use]
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extern crate invalid_punct_ident;
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@ -1,5 +1,5 @@
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error: proc macro panicked
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--> $DIR/invalid-punct-ident-3.rs:11:1
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--> $DIR/invalid-punct-ident-3.rs:6:1
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LL | invalid_raw_ident!();
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| ^^^^^^^^^^^^^^^^^^^^
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@ -1,10 +1,5 @@
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// aux-build:proc-macro-panic.rs
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// edition:2018
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// ignore-stage1
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// only-linux
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//
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// FIXME: This should be a normal (stage1, all platforms) test in
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// src/test/ui/proc-macro once issue #59998 is fixed.
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// Regression test for issue #76270
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// Tests that we don't print an ICE message when a panic
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@ -1,5 +1,5 @@
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error: proc macro panicked
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--> $DIR/issue-76270-panic-in-libproc-macro.rs:15:1
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--> $DIR/issue-76270-panic-in-libproc-macro.rs:10:1
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LL | proc_macro_panic::panic_in_libproc_macro!();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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@ -1,18 +1,8 @@
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// aux-build:test-macros.rs
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// compile-flags: -Z proc-macro-backtrace
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// rustc-env:RUST_BACKTRACE=0
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// FIXME https://github.com/rust-lang/rust/issues/59998
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// normalize-stderr-test "thread '.*' panicked " -> ""
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// normalize-stderr-test "note:.*RUST_BACKTRACE=1.*\n" -> ""
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// normalize-stderr-test "\nerror: internal compiler error.*\n\n" -> ""
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// normalize-stderr-test "note:.*unexpectedly panicked.*\n\n" -> ""
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// normalize-stderr-test "note: we would appreciate a bug report.*\n\n" -> ""
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// normalize-stderr-test "note: compiler flags.*\n\n" -> ""
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// normalize-stderr-test "note: rustc.*running on.*\n\n" -> ""
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// normalize-stderr-test "query stack during panic:\n" -> ""
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// normalize-stderr-test "we're just showing a limited slice of the query stack\n" -> ""
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// normalize-stderr-test "end of query stack\n" -> ""
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#[macro_use]
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extern crate test_macros;
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@ -1,6 +1,6 @@
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at 'panic-derive', $DIR/auxiliary/test-macros.rs:43:5
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error: proc-macro derive panicked
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--> $DIR/load-panic-backtrace.rs:20:10
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--> $DIR/load-panic-backtrace.rs:10:10
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LL | #[derive(Panic)]
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| ^^^^^
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