[binutils-gdb] Defer minimal symbol name-setting

[Tom Tromey <tromey@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=5a79c10755d00b71b33b8715e5a665bfd78c9222

commit 5a79c10755d00b71b33b8715e5a665bfd78c9222
Author: Tom Tromey <tom@tromey.com>
Date:   Sat Mar 2 13:19:44 2019 -0700

    Defer minimal symbol name-setting
    
    Currently the demangled name of a minimal symbol is set when creating
    the symbol.  However, there is no intrinsic need to do this.  This
    patch instead arranges for the demangling to be done just before the
    minsym hash tables are filled.  This will be useful in a later patch.
    
    gdb/ChangeLog
    2019-11-26  Tom Tromey  <tom@tromey.com>
    
    	* symtab.h (struct minimal_symbol) <name_set>: New member.
    	* minsyms.c (minimal_symbol_reader::record_full): Copy name.
    	Don't call symbol_set_names.
    	(minimal_symbol_reader::install): Call symbol_set_names.
    
    Change-Id: I4fe3993b99fb3a43968067806e294d48e377fd76

Diff:
---
 gdb/ChangeLog |  7 +++++++
 gdb/minsyms.c | 18 +++++++++++++++++-
 gdb/symtab.h  |  4 ++++
 3 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index b061e88..dc684be 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,10 @@
+2019-11-26  Tom Tromey  <tom@tromey.com>
+
+	* symtab.h (struct minimal_symbol) <name_set>: New member.
+	* minsyms.c (minimal_symbol_reader::record_full): Copy name.
+	Don't call symbol_set_names.
+	(minimal_symbol_reader::install): Call symbol_set_names.
+
 2019-11-26  Philippe Waroquiers  <philippe.waroquiers@skynet.be>
 
 	* python/python.c (gdbpy_enter::~gdbpy_enter): Release GIL after
diff --git a/gdb/minsyms.c b/gdb/minsyms.c
index a9ba66b..6e7021a 100644
--- a/gdb/minsyms.c
+++ b/gdb/minsyms.c
@@ -1127,7 +1127,12 @@ minimal_symbol_reader::record_full (gdb::string_view name,
   msymbol = &m_msym_bunch->contents[m_msym_bunch_index];
   symbol_set_language (msymbol, language_auto,
 		       &m_objfile->per_bfd->storage_obstack);
-  symbol_set_names (msymbol, name, copy_name, m_objfile->per_bfd);
+
+  if (copy_name)
+    msymbol->name = obstack_strndup (&m_objfile->per_bfd->storage_obstack,
+				     name.data (), name.size ());
+  else
+    msymbol->name = name.data ();
 
   SET_MSYMBOL_VALUE_ADDRESS (msymbol, address);
   MSYMBOL_SECTION (msymbol) = section;
@@ -1354,6 +1359,17 @@ minimal_symbol_reader::install ()
       m_objfile->per_bfd->minimal_symbol_count = mcount;
       m_objfile->per_bfd->msymbols = std::move (msym_holder);
 
+      msymbols = m_objfile->per_bfd->msymbols.get ();
+      for (int i = 0; i < mcount; ++i)
+	{
+	  if (!msymbols[i].name_set)
+	    {
+	      symbol_set_names (&msymbols[i], msymbols[i].name,
+				false, m_objfile->per_bfd);
+	      msymbols[i].name_set = 1;
+	    }
+	}
+
       build_minimal_symbol_hash_tables (m_objfile);
     }
 }
diff --git a/gdb/symtab.h b/gdb/symtab.h
index 897ffda..bcbc9c8 100644
--- a/gdb/symtab.h
+++ b/gdb/symtab.h
@@ -668,6 +668,10 @@ struct minimal_symbol : public general_symbol_info
 
   unsigned maybe_copied : 1;
 
+  /* Non-zero if this symbol ever had its demangled name set (even if
+     it was set to NULL).  */
+  unsigned int name_set : 1;
+
   /* Minimal symbols with the same hash key are kept on a linked
      list.  This is the link.  */