diff mbox series

[RFC,v2,PR,symtab/30520,1/4] gdb/symtab: check name matches before expanding a CU

Message ID 20240123170325.752251-1-dmitry.neverov@jetbrains.com
State New
Headers
Series [RFC,v2,PR,symtab/30520,1/4] gdb/symtab: check name matches before expanding a CU |

Checks

Context Check Description
linaro-tcwg-bot/tcwg_gdb_build--master-aarch64 success Testing passed
linaro-tcwg-bot/tcwg_gdb_build--master-arm success Testing passed
linaro-tcwg-bot/tcwg_gdb_check--master-arm success Testing passed
linaro-tcwg-bot/tcwg_gdb_check--master-aarch64 success Testing passed

Commit Message

Dmitry Neverov Jan. 23, 2024, 5:03 p.m. UTC 
  From: "Dmitry.Neverov" <dmitry.neverov@jetbrains.com>

The added check fixes the case when an unqualified lookup
name without template arguments causes expansion of many CUs
which contain the name with template arguments.

This is similar to what dw2_expand_symtabs_matching_symbol does
before expanding the CU.

In the referenced issue the lookup name was wxObjectDataPtr and many
CUs had names like wxObjectDataPtr<wxBitmapBundleImpl>. This caused
their expansion and the lookup took around a minute. The added check
helps to avoid the expansion and makes the symbol lookup to return in
a second or so.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30520
---
 gdb/dwarf2/read.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index bdfda31dc16..b125b2e69f0 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -16690,9 +16690,25 @@  cooked_index_functions::expand_symtabs_matching
 		= lookup_name_without_params.match_type ();
 	      if ((match_type == symbol_name_match_type::FULL
 		   || (lang != language_ada
-		       && match_type == symbol_name_match_type::EXPRESSION))
-		  && parent != nullptr)
-		continue;
+		       && match_type == symbol_name_match_type::EXPRESSION)))
+		{
+		  if (parent != nullptr)
+		    continue;
+
+		  if (entry->lang != language_unknown)
+		    {
+		      const language_defn *lang_def = language_def (entry->lang);
+		      lookup_name_info last_segment_lookup_name (
+			last_name.data (), symbol_name_match_type::FULL,
+			false, true);
+		      symbol_name_matcher_ftype *name_matcher
+			= lang_def->get_symbol_name_matcher
+			  (last_segment_lookup_name);
+		      if (!name_matcher (entry->canonical,
+					 last_segment_lookup_name, nullptr))
+			continue;
+		    }
+	      }
 	    }
 	  else
 	    {