gdb: pass objfile_per_bfd_storage instead of objfile to partial_symtab

Since partial_symtab is supposed to be objfile-independent (since series
[1]), I think it would make sense for partial_symtab to not take an
objfile as a parameter in its constructor.

This patch replaces that parameter with an objfile_per_bfd_storage
parameter.

The objfile is used for two things:

 - to get the objfile_name, for debug messages.  We can get that name
   from the bfd instead.
 - to intern the partial symtab filename.  Even though it goes through
   an objfile method, the request is actually forwarded to the
   underlying objfile_per_bfd_storage.  So we can ask the new
   objfile_per_bfd_storage instead.

In order to get a reference to the BFD from the objfile_per_bfd_storage,
the BFD is saved in the objfile_per_bfd_storage object.

[1] https://sourceware.org/pipermail/gdb-patches/2021-February/176625.html

gdb/ChangeLog:

	* psympriv.h (struct partial_symtab) <partial_symtab>: Change
	objfile parameter for objfile_per_bfd_storage, adjust callers.
	(struct standard_psymtab) <standard_psymtab>: Likewise.
	(struct legacy_psymtab) <legacy_psymtab>: Likewise.
	* psymtab.c (partial_symtab::partial_symtab): Likewise.
	* ctfread.c (struct ctf_psymtab): Likewise.
	* dwarf2/read.h (struct dwarf2_psymtab): Likewise.
	* dwarf2/read.c (struct dwarf2_include_psymtab): Likewise.
	(dwarf2_create_include_psymtab): Likewise.
	* objfiles.h (struct objfile_per_bfd_storage)
	<objfile_per_bfd_storage>: Add bfd parameter, adjust callers.
	<get_bfd>: New method.
	<m_bfd>: New field.
	* objfiles.c (get_objfile_bfd_data): Adjust.

Change-Id: I2ed3ab5d2e6f27d034bd4dc26ae2fae7b0b8a2b9

11 files changed, 75 insertions, 46 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 6d61a2c..3530819 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,22 @@
 2021-04-02  Simon Marchi  <simon.marchi@polymtl.ca>
 
+	* psympriv.h (struct partial_symtab) <partial_symtab>: Change
+	objfile parameter for objfile_per_bfd_storage, adjust callers.
+	(struct standard_psymtab) <standard_psymtab>: Likewise.
+	(struct legacy_psymtab) <legacy_psymtab>: Likewise.
+	* psymtab.c (partial_symtab::partial_symtab): Likewise.
+	* ctfread.c (struct ctf_psymtab): Likewise.
+	* dwarf2/read.h (struct dwarf2_psymtab): Likewise.
+	* dwarf2/read.c (struct dwarf2_include_psymtab): Likewise.
+	(dwarf2_create_include_psymtab): Likewise.
+	* objfiles.h (struct objfile_per_bfd_storage)
+	<objfile_per_bfd_storage>: Add bfd parameter, adjust callers.
+	<get_bfd>: New method.
+	<m_bfd>: New field.
+	* objfiles.c (get_objfile_bfd_data): Adjust.
+
+2021-04-02  Simon Marchi  <simon.marchi@polymtl.ca>
+
 	* psymtab.c (partial_symtab::partial_symtab): Change
 	last_objfile_name to be an std::string.
 	* symfile.c (allocate_symtab): Likewise.
diff --git a/gdb/ctfread.c b/gdb/ctfread.c
index 616464c..fae244d 100644
--- a/gdb/ctfread.c
+++ b/gdb/ctfread.c
@@ -125,9 +125,9 @@ struct ctf_psymtab : public standard_psymtab
 {
   ctf_psymtab (const char *filename,
 	       psymtab_storage *partial_symtabs,
-	       struct objfile *objfile,
+	       objfile_per_bfd_storage *objfile_per_bfd,
 	       CORE_ADDR addr)
-    : standard_psymtab (filename, partial_symtabs, objfile, addr)
+    : standard_psymtab (filename, partial_symtabs, objfile_per_bfd, addr)
   {
   }
 
@@ -1369,7 +1369,7 @@ create_partial_symtab (const char *name,
   ctf_psymtab *pst;
   struct ctf_context *ccx;
 
-  pst = new ctf_psymtab (name, partial_symtabs, objfile, 0);
+  pst = new ctf_psymtab (name, partial_symtabs, objfile->per_bfd, 0);
 
   ccx = XOBNEW (&objfile->objfile_obstack, struct ctf_context);
   ccx->fp = cfp;
diff --git a/gdb/dbxread.c b/gdb/dbxread.c
index 99a36ca..5cf77e9 100644
--- a/gdb/dbxread.c
+++ b/gdb/dbxread.c
@@ -1917,7 +1917,7 @@ start_psymtab (psymtab_storage *partial_symtabs, struct objfile *objfile,
 	       const char *filename, CORE_ADDR textlow, int ldsymoff)
 {
   legacy_psymtab *result = new legacy_psymtab (filename, partial_symtabs,
-					       objfile, textlow);
+					       objfile->per_bfd, textlow);
 
   result->read_symtab_private =
     XOBNEW (&objfile->objfile_obstack, struct symloc);
@@ -2040,7 +2040,7 @@ dbx_end_psymtab (struct objfile *objfile, psymtab_storage *partial_symtabs,
   for (i = 0; i < num_includes; i++)
     {
       legacy_psymtab *subpst =
-	new legacy_psymtab (include_list[i], partial_symtabs, objfile);
+	new legacy_psymtab (include_list[i], partial_symtabs, objfile->per_bfd);
 
       subpst->read_symtab_private =
 	XOBNEW (&objfile->objfile_obstack, struct symloc);
diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index 49b07d5..43433f5 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -6248,8 +6248,8 @@ struct dwarf2_include_psymtab : public partial_symtab
 {
   dwarf2_include_psymtab (const char *filename,
 			  psymtab_storage *partial_symtabs,
-			  struct objfile *objfile)
-    : partial_symtab (filename, partial_symtabs, objfile)
+			  objfile_per_bfd_storage *objfile_per_bfd)
+    : partial_symtab (filename, partial_symtabs, objfile_per_bfd)
   {
   }
 
@@ -6305,10 +6305,10 @@ dwarf2_create_include_psymtab (dwarf2_per_bfd *per_bfd,
 			       const char *name,
 			       dwarf2_psymtab *pst,
 			       psymtab_storage *partial_symtabs,
-			       struct objfile *objfile)
+			       objfile_per_bfd_storage *objfile_per_bfd)
 {
   dwarf2_include_psymtab *subpst
-    = new dwarf2_include_psymtab (name, partial_symtabs, objfile);
+    = new dwarf2_include_psymtab (name, partial_symtabs, objfile_per_bfd);
 
   if (!IS_ABSOLUTE_PATH (subpst->filename))
     subpst->dirname = pst->dirname;
@@ -7560,11 +7560,9 @@ create_partial_symtab (dwarf2_per_cu_data *per_cu,
 		       dwarf2_per_objfile *per_objfile,
 		       const char *name)
 {
-  struct objfile *objfile = per_objfile->objfile;
-  dwarf2_psymtab *pst;
-
-  pst = new dwarf2_psymtab (name, per_objfile->per_bfd->partial_symtabs.get (),
-			    objfile, per_cu);
+  dwarf2_psymtab *pst
+    = new dwarf2_psymtab (name, per_objfile->per_bfd->partial_symtabs.get (),
+			  per_objfile->objfile->per_bfd, per_cu);
 
   pst->psymtabs_addrmap_supported = true;
 
@@ -22010,7 +22008,7 @@ dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
 	      dwarf2_create_include_psymtab
 		(cu->per_objfile->per_bfd, include_name, pst,
 		 cu->per_objfile->per_bfd->partial_symtabs.get (),
-		 objfile);
+		 objfile->per_bfd);
 	  }
     }
   else
diff --git a/gdb/dwarf2/read.h b/gdb/dwarf2/read.h
index 82ab387..416d8ea 100644
--- a/gdb/dwarf2/read.h
+++ b/gdb/dwarf2/read.h
@@ -408,9 +408,9 @@ struct dwarf2_psymtab : public partial_symtab
 {
   dwarf2_psymtab (const char *filename,
 		  psymtab_storage *partial_symtabs,
-		  struct objfile *objfile,
+		  objfile_per_bfd_storage *objfile_per_bfd,
 		  dwarf2_per_cu_data *per_cu)
-    : partial_symtab (filename, partial_symtabs, objfile, 0),
+    : partial_symtab (filename, partial_symtabs, objfile_per_bfd, 0),
       per_cu_data (per_cu)
   {
   }
diff --git a/gdb/mdebugread.c b/gdb/mdebugread.c
index 7bf4564..026f2ff 100644
--- a/gdb/mdebugread.c
+++ b/gdb/mdebugread.c
@@ -2605,8 +2605,8 @@ parse_partial_symbols (minimal_symbol_reader &reader,
 	textlow = fh->adr;
       else
 	textlow = 0;
-      pst = new legacy_psymtab (fdr_name (fh), partial_symtabs, objfile,
-				textlow);
+      pst = new legacy_psymtab (fdr_name (fh), partial_symtabs,
+				objfile->per_bfd, textlow);
       pst->read_symtab_private = XOBNEW (&objfile->objfile_obstack, symloc);
       memset (pst->read_symtab_private, 0, sizeof (struct symloc));
 
@@ -4646,7 +4646,7 @@ new_psymtab (const char *name, psymtab_storage *partial_symtabs,
 {
   legacy_psymtab *psymtab;
 
-  psymtab = new legacy_psymtab (name, partial_symtabs, objfile);
+  psymtab = new legacy_psymtab (name, partial_symtabs, objfile->per_bfd);
 
   /* Keep a backpointer to the file's symbols.  */
 
diff --git a/gdb/objfiles.c b/gdb/objfiles.c
index ed51c31..7029007 100644
--- a/gdb/objfiles.c
+++ b/gdb/objfiles.c
@@ -134,7 +134,7 @@ get_objfile_bfd_data (struct objfile *objfile, struct bfd *abfd)
 
   if (storage == NULL)
     {
-      storage = new objfile_per_bfd_storage;
+      storage = new objfile_per_bfd_storage (abfd);
       /* If the object requires gdb to do relocations, we simply fall
 	 back to not sharing data across users.  These cases are rare
 	 enough that this seems reasonable.  */
diff --git a/gdb/objfiles.h b/gdb/objfiles.h
index e8a8b5f..bf6e6a1 100644
--- a/gdb/objfiles.h
+++ b/gdb/objfiles.h
@@ -264,8 +264,8 @@ private:
 
 struct objfile_per_bfd_storage
 {
-  objfile_per_bfd_storage ()
-    : minsyms_read (false)
+  objfile_per_bfd_storage (bfd *bfd)
+    : minsyms_read (false), m_bfd (bfd)
   {}
 
   ~objfile_per_bfd_storage ();
@@ -287,6 +287,13 @@ struct objfile_per_bfd_storage
     return (const char *) string_cache.insert (str.c_str (), str.size () + 1);
   }
 
+  /* Get the BFD this object is associated to.  */
+
+  bfd *get_bfd () const
+  {
+    return m_bfd;
+  }
+
   /* The storage has an obstack of its own.  */
 
   auto_obstack storage_obstack;
@@ -364,6 +371,11 @@ struct objfile_per_bfd_storage
   /* All the different languages of symbols found in the demangled
      hash table.  */
   std::bitset<nr_languages> demangled_hash_languages;
+
+private:
+  /* The BFD this object is associated to.  */
+
+  bfd *m_bfd;
 };
 
 /* An iterator that first returns a parent objfile, and then each
diff --git a/gdb/psympriv.h b/gdb/psympriv.h
index 193d64f..e4bf038 100644
--- a/gdb/psympriv.h
+++ b/gdb/psympriv.h
@@ -111,7 +111,8 @@ enum class psymbol_placement
 
 struct partial_symtab
 {
-  /* Allocate a new partial symbol table associated with OBJFILE.
+  /* Allocate a new partial symbol table.
+
      FILENAME (which must be non-NULL) is the filename of this partial
      symbol table; it is copied into the appropriate storage.  The
      partial symtab will also be installed using
@@ -119,7 +120,7 @@ struct partial_symtab
 
   partial_symtab (const char *filename,
 		  psymtab_storage *partial_symtabs,
-		  struct objfile *objfile)
+		  objfile_per_bfd_storage *objfile_per_bfd)
     ATTRIBUTE_NONNULL (2) ATTRIBUTE_NONNULL (3);
 
   /* Like the above, but also sets the initial text low and text high
@@ -128,7 +129,7 @@ struct partial_symtab
 
   partial_symtab (const char *filename,
 		  psymtab_storage *partial_symtabs,
-		  struct objfile *objfile,
+		  objfile_per_bfd_storage *objfile_per_bfd,
 		  CORE_ADDR addr)
     ATTRIBUTE_NONNULL (2) ATTRIBUTE_NONNULL (3);
 
@@ -369,16 +370,16 @@ struct standard_psymtab : public partial_symtab
 {
   standard_psymtab (const char *filename,
 		    psymtab_storage *partial_symtabs,
-		    struct objfile *objfile)
-    : partial_symtab (filename, partial_symtabs, objfile)
+		    objfile_per_bfd_storage *objfile_per_bfd)
+    : partial_symtab (filename, partial_symtabs, objfile_per_bfd)
   {
   }
 
   standard_psymtab (const char *filename,
 		    psymtab_storage *partial_symtabs,
-		    struct objfile *objfile,
+		    objfile_per_bfd_storage *objfile_per_bfd,
 		    CORE_ADDR addr)
-    : partial_symtab (filename, partial_symtabs, objfile, addr)
+    : partial_symtab (filename, partial_symtabs, objfile_per_bfd, addr)
   {
   }
 
@@ -411,16 +412,16 @@ struct legacy_psymtab : public standard_psymtab
 {
   legacy_psymtab (const char *filename,
 		  psymtab_storage *partial_symtabs,
-		  struct objfile *objfile)
-    : standard_psymtab (filename, partial_symtabs, objfile)
+		  objfile_per_bfd_storage *objfile_per_bfd)
+    : standard_psymtab (filename, partial_symtabs, objfile_per_bfd)
   {
   }
 
   legacy_psymtab (const char *filename,
 		  psymtab_storage *partial_symtabs,
-		  struct objfile *objfile,
+		  objfile_per_bfd_storage *objfile_per_bfd,
 		  CORE_ADDR addr)
-    : standard_psymtab (filename, partial_symtabs, objfile, addr)
+    : standard_psymtab (filename, partial_symtabs, objfile_per_bfd, addr)
   {
   }
 
diff --git a/gdb/psymtab.c b/gdb/psymtab.c
index 26ea35e..6f3d856 100644
--- a/gdb/psymtab.c
+++ b/gdb/psymtab.c
@@ -1436,9 +1436,9 @@ psymbol_functions::find_compunit_symtab_by_address (struct objfile *objfile,
 
 partial_symtab::partial_symtab (const char *filename,
 				psymtab_storage *partial_symtabs,
-				struct objfile *objfile,
+				objfile_per_bfd_storage *objfile_per_bfd,
 				CORE_ADDR textlow)
-  : partial_symtab (filename, partial_symtabs, objfile)
+  : partial_symtab (filename, partial_symtabs, objfile_per_bfd)
 {
   set_text_low (textlow);
   set_text_high (raw_text_low ()); /* default */
@@ -1561,28 +1561,29 @@ partial_symtab::add_psymbol (gdb::string_view name, bool copy_name,
 
 partial_symtab::partial_symtab (const char *filename_,
 				psymtab_storage *partial_symtabs,
-				struct objfile *objfile)
+				objfile_per_bfd_storage *objfile_per_bfd)
   : searched_flag (PST_NOT_SEARCHED),
     text_low_valid (0),
     text_high_valid (0)
 {
   partial_symtabs->install_psymtab (this);
 
-  filename = objfile->intern (filename_);
+  filename = objfile_per_bfd->intern (filename_);
 
   if (symtab_create_debug)
     {
       /* Be a bit clever with debugging messages, and don't print objfile
 	 every time, only when it changes.  */
-      static std::string last_objfile_name;
-      const char *this_objfile_name = objfile_name (objfile);
+      static std::string last_bfd_name;
+      const char *this_bfd_name
+	= bfd_get_filename (objfile_per_bfd->get_bfd ());
 
-      if (last_objfile_name.empty () || last_objfile_name != this_objfile_name)
+      if (last_bfd_name.empty () || last_bfd_name != this_bfd_name)
 	{
-	  last_objfile_name = this_objfile_name;
+	  last_bfd_name = this_bfd_name;
 	  fprintf_filtered (gdb_stdlog,
-			    "Creating one or more psymtabs for objfile %s ...\n",
-			    this_objfile_name);
+			    "Creating one or more psymtabs for %s ...\n",
+			    this_bfd_name);
 	}
       fprintf_filtered (gdb_stdlog,
 			"Created psymtab %s for module %s.\n",
diff --git a/gdb/xcoffread.c b/gdb/xcoffread.c
index 30ac876..3685727 100644
--- a/gdb/xcoffread.c
+++ b/gdb/xcoffread.c
@@ -1966,7 +1966,7 @@ xcoff_start_psymtab (psymtab_storage *partial_symtabs,
 {
   /* We fill in textlow later.  */
   legacy_psymtab *result = new legacy_psymtab (filename, partial_symtabs,
-					       objfile, 0);
+					       objfile->per_bfd, 0);
 
   result->read_symtab_private =
     XOBNEW (&objfile->objfile_obstack, struct symloc);
@@ -2022,7 +2022,7 @@ xcoff_end_psymtab (struct objfile *objfile, psymtab_storage *partial_symtabs,
   for (i = 0; i < num_includes; i++)
     {
       legacy_psymtab *subpst =
-	new legacy_psymtab (include_list[i], partial_symtabs, objfile);
+	new legacy_psymtab (include_list[i], partial_symtabs, objfile->per_bfd);
 
       subpst->read_symtab_private = XOBNEW (&objfile->objfile_obstack, symloc);
       ((struct symloc *) subpst->read_symtab_private)->first_symnum = 0;