diff options
Diffstat (limited to 'compiler/rustc_codegen_llvm/src')
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/base.rs | 12 | ||||
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/debuginfo/gdb.rs | 30 | ||||
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/debuginfo/mod.rs | 36 |
3 files changed, 34 insertions, 44 deletions
diff --git a/compiler/rustc_codegen_llvm/src/base.rs b/compiler/rustc_codegen_llvm/src/base.rs index d7da03bf490..5dda836988c 100644 --- a/compiler/rustc_codegen_llvm/src/base.rs +++ b/compiler/rustc_codegen_llvm/src/base.rs @@ -109,16 +109,11 @@ pub(crate) fn compile_codegen_unit( } // Finalize code coverage by injecting the coverage map. Note, the coverage map will - // also be added to the `llvm.compiler.used` variable, created below. + // also be added to the `llvm.compiler.used` variable, created next. if cx.sess().instrument_coverage() { cx.coverageinfo_finalize(); } - // Finalize debuginfo. This adds to `llvm.used`, created below. - if cx.sess().opts.debuginfo != DebugInfo::None { - cx.debuginfo_finalize(); - } - // Create the llvm.used and llvm.compiler.used variables. if !cx.used_statics.is_empty() { cx.create_used_variable_impl(c"llvm.used", &cx.used_statics); @@ -135,6 +130,11 @@ pub(crate) fn compile_codegen_unit( llvm::LLVMDeleteGlobal(old_g); } } + + // Finalize debuginfo + if cx.sess().opts.debuginfo != DebugInfo::None { + cx.debuginfo_finalize(); + } } ModuleCodegen::new_regular(cgu_name.to_string(), llvm_module) diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/gdb.rs b/compiler/rustc_codegen_llvm/src/debuginfo/gdb.rs index b3e978be570..6eb7042da61 100644 --- a/compiler/rustc_codegen_llvm/src/debuginfo/gdb.rs +++ b/compiler/rustc_codegen_llvm/src/debuginfo/gdb.rs @@ -1,7 +1,5 @@ // .debug_gdb_scripts binary section. -use std::ffi::CString; - use rustc_codegen_ssa::base::collect_debugger_visualizers_transitive; use rustc_codegen_ssa::traits::*; use rustc_hir::def_id::LOCAL_CRATE; @@ -33,12 +31,7 @@ pub(crate) fn insert_reference_to_gdb_debug_scripts_section_global(bx: &mut Buil pub(crate) fn get_or_insert_gdb_debug_scripts_section_global<'ll>( cx: &CodegenCx<'ll, '_>, ) -> &'ll Value { - let c_section_var_name = CString::new(format!( - "__rustc_debug_gdb_scripts_section_{}_{:08x}", - cx.tcx.crate_name(LOCAL_CRATE), - cx.tcx.stable_crate_id(LOCAL_CRATE), - )) - .unwrap(); + let c_section_var_name = c"__rustc_debug_gdb_scripts_section__"; let section_var_name = c_section_var_name.to_str().unwrap(); let section_var = unsafe { llvm::LLVMGetNamedGlobal(cx.llmod, c_section_var_name.as_ptr()) }; @@ -91,10 +84,17 @@ pub(crate) fn get_or_insert_gdb_debug_scripts_section_global<'ll>( } pub(crate) fn needs_gdb_debug_scripts_section(cx: &CodegenCx<'_, '_>) -> bool { - // We collect pretty printers transitively for all crates, so we make sure - // that the section is only emitted for leaf crates. + // To ensure the section `__rustc_debug_gdb_scripts_section__` will not create + // ODR violations at link time, this section will not be emitted for rlibs since + // each rlib could produce a different set of visualizers that would be embedded + // in the `.debug_gdb_scripts` section. For that reason, we make sure that the + // section is only emitted for leaf crates. let embed_visualizers = cx.tcx.crate_types().iter().any(|&crate_type| match crate_type { - CrateType::Executable | CrateType::Cdylib | CrateType::Staticlib | CrateType::Sdylib => { + CrateType::Executable + | CrateType::Dylib + | CrateType::Cdylib + | CrateType::Staticlib + | CrateType::Sdylib => { // These are crate types for which we will embed pretty printers since they // are treated as leaf crates. true @@ -105,11 +105,9 @@ pub(crate) fn needs_gdb_debug_scripts_section(cx: &CodegenCx<'_, '_>) -> bool { // want to slow down the common case. false } - CrateType::Rlib | CrateType::Dylib => { - // Don't embed pretty printers for these crate types; the compiler - // can see the `#[debug_visualizer]` attributes when using the - // library, and emitting `.debug_gdb_scripts` regardless would - // break `#![omit_gdb_pretty_printer_section]`. + CrateType::Rlib => { + // As per the above description, embedding pretty printers for rlibs could + // lead to ODR violations so we skip this crate type as well. false } }); diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs b/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs index c911435967c..6cbf2dbf7d3 100644 --- a/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs +++ b/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs @@ -30,7 +30,7 @@ use tracing::debug; use self::metadata::{UNKNOWN_COLUMN_NUMBER, UNKNOWN_LINE_NUMBER, file_metadata, type_di_node}; use self::namespace::mangled_name_of_instance; -use self::utils::{DIB, create_DIArray, debug_context, is_node_local_to_unit}; +use self::utils::{DIB, create_DIArray, is_node_local_to_unit}; use crate::builder::Builder; use crate::common::{AsCCharPtr, CodegenCx}; use crate::llvm; @@ -131,28 +131,20 @@ impl<'ll, 'tcx> CodegenUnitDebugContext<'ll, 'tcx> { } /// Creates any deferred debug metadata nodes -pub(crate) fn finalize(cx: &mut CodegenCx<'_, '_>) { - if cx.dbg_cx.is_none() { - return; - } - - debug!("finalize"); - - if gdb::needs_gdb_debug_scripts_section(cx) { - // Add a .debug_gdb_scripts section to this compile-unit. This will - // cause GDB to try and load the gdb_load_rust_pretty_printers.py file, - // which activates the Rust pretty printers for binary this section is - // contained in. - let section_var = gdb::get_or_insert_gdb_debug_scripts_section_global(cx); +pub(crate) fn finalize(cx: &CodegenCx<'_, '_>) { + if let Some(dbg_cx) = &cx.dbg_cx { + debug!("finalize"); + + if gdb::needs_gdb_debug_scripts_section(cx) { + // Add a .debug_gdb_scripts section to this compile-unit. This will + // cause GDB to try and load the gdb_load_rust_pretty_printers.py file, + // which activates the Rust pretty printers for binary this section is + // contained in. + gdb::get_or_insert_gdb_debug_scripts_section_global(cx); + } - // Make sure that the linker doesn't optimize the global away. Adding - // it to `llvm.used` has the advantage that it works even in no_std - // binaries, where we don't have a main shim and thus don't emit a - // volatile load to preserve the global. - cx.add_used_global(section_var); + dbg_cx.finalize(cx.sess()); } - - debug_context(cx).finalize(cx.sess()); } impl<'ll> Builder<'_, 'll, '_> { @@ -622,7 +614,7 @@ impl<'ll, 'tcx> DebugInfoCodegenMethods<'tcx> for CodegenCx<'ll, 'tcx> { metadata::extend_scope_to_file(self, scope_metadata, file) } - fn debuginfo_finalize(&mut self) { + fn debuginfo_finalize(&self) { finalize(self) } |