From 46e3d04b2baab130be52dc2b3a26085b3582f8ba Mon Sep 17 00:00:00 2001 From: Michael Woerister Date: Tue, 21 May 2019 13:41:44 +0200 Subject: [PATCH] debuginfo: Revert to old/more verbose behavior for -Cdebuginfo=1. https://github.com/rust-lang/rust/commit/cff075009 made LLVM emit less debuginfo when compiling with "line-tables-only". The change was essentially correct but the reduced amount of debuginfo broke a number of tools. This commit reverts the change so we get back the old behavior, until we figure out how to do this properly and give external tools to adapt to the new format. See https://github.com/rust-lang/rust/issues/60020 for more info. --- .../debuginfo/metadata.rs | 23 +++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/src/librustc_codegen_llvm/debuginfo/metadata.rs b/src/librustc_codegen_llvm/debuginfo/metadata.rs index 9bdce37b8bae..13590faa1238 100644 --- a/src/librustc_codegen_llvm/debuginfo/metadata.rs +++ b/src/librustc_codegen_llvm/debuginfo/metadata.rs @@ -31,7 +31,7 @@ use rustc::ty::{self, AdtKind, ParamEnv, Ty, TyCtxt}; use rustc::ty::layout::{self, Align, Integer, IntegerExt, LayoutOf, PrimitiveExt, Size, TyLayout, VariantIdx}; use rustc::ty::subst::UnpackedKind; -use rustc::session::config; +use rustc::session::config::{self, DebugInfo}; use rustc::util::nodemap::FxHashMap; use rustc_fs_util::path_to_c_string; use rustc_data_structures::small_c_str::SmallCStr; @@ -925,7 +925,26 @@ pub fn compile_unit_metadata(tcx: TyCtxt<'_, '_, '_>, let producer = CString::new(producer).unwrap(); let flags = "\0"; let split_name = "\0"; - let kind = DebugEmissionKind::from_generic(tcx.sess.opts.debuginfo); + + // FIXME(#60020): + // + // This should actually be + // + // ``` + // let kind = DebugEmissionKind::from_generic(tcx.sess.opts.debuginfo); + // ``` + // + // that is, we should set LLVM's emission kind to `LineTablesOnly` if + // we are compiling with "limited" debuginfo. However, some of the + // existing tools relied on slightly more debuginfo being generated than + // would be the case with `LineTablesOnly`, and we did not want to break + // these tools in a "drive-by fix", without a good idea or plan about + // what limited debuginfo should exactly look like. So for now we keep + // the emission kind as `FullDebug`. + // + // See https://github.com/rust-lang/rust/issues/60020 for details. + let kind = DebugEmissionKind::FullDebug; + assert!(tcx.sess.opts.debuginfo != DebugInfo::None); unsafe { let file_metadata = llvm::LLVMRustDIBuilderCreateFile(