Consolidate partial symtab dependency reading

Most of the symbol readers have code to iterate over a partial symtabs
dependencies, expanding each one and optionally printing a message.
Now that the "second-stage" psymtab expansion is available as a
method, these implementations can all be merged.

This patch also changes a couple more warnings into assertions.

gdb/ChangeLog
2020-01-26  Tom Tromey  <tom@tromey.com>

	* xcoffread.c (xcoff_psymtab_to_symtab_1): Call
	read_dependencies.  Add assert.
	* psymtab.c (partial_symtab::read_dependencies): New method.
	* psympriv.h (struct partial_symtab) <read_dependencies>: New
	method.
	* mdebugread.c (psymtab_to_symtab_1): Call read_dependencies.
	* dwarf2read.c (dwarf2_psymtab::expand_psymtab): Call
	read_dependencies.
	* dbxread.c (dbx_psymtab_to_symtab_1): Call read_dependencies.
	Add assert.

Change-Id: I8151e05677794e90223edc1a4cb70f7f69137d46

gdb/ChangeLog

@@ -1,3 +1,16 @@
+2020-01-26  Tom Tromey  <tom@tromey.com>
+
+	* xcoffread.c (xcoff_psymtab_to_symtab_1): Call
+	read_dependencies.  Add assert.
+	* psymtab.c (partial_symtab::read_dependencies): New method.
+	* psympriv.h (struct partial_symtab) <read_dependencies>: New
+	method.
+	* mdebugread.c (psymtab_to_symtab_1): Call read_dependencies.
+	* dwarf2read.c (dwarf2_psymtab::expand_psymtab): Call
+	read_dependencies.
+	* dbxread.c (dbx_psymtab_to_symtab_1): Call read_dependencies.
+	Add assert.
+
 2020-01-26  Tom Tromey  <tom@tromey.com>
 
 	* xcoffread.c (xcoff_psymtab_to_symtab_1): Change argument order.

gdb/dbxread.c

@@ -2068,33 +2068,10 @@ dbx_end_psymtab (struct objfile *objfile, legacy_psymtab *pst,
 static void
 dbx_psymtab_to_symtab_1 (legacy_psymtab *pst, struct objfile *objfile)
 {
-  int i;
+  gdb_assert (!pst->readin);
-
-  if (pst->readin)
-    {
-      fprintf_unfiltered (gdb_stderr, "Psymtab for %s already read in.  "
-			  "Shouldn't happen.\n",
-			  pst->filename);
-      return;
-    }
 
   /* Read in all partial symtabs on which this one is dependent.  */
-  for (i = 0; i < pst->number_of_dependencies; i++)
+  pst->read_dependencies (objfile);
-    if (!pst->dependencies[i]->readin)
-      {
-	/* Inform about additional files that need to be read in.  */
-	if (info_verbose)
-	  {
-	    fputs_filtered (" ", gdb_stdout);
-	    wrap_here ("");
-	    fputs_filtered ("and ", gdb_stdout);
-	    wrap_here ("");
-	    printf_filtered ("%s...", pst->dependencies[i]->filename);
-	    wrap_here ("");	/* Flush output.  */
-	    gdb_flush (gdb_stdout);
-	  }
-	pst->dependencies[i]->expand_psymtab (objfile);
-      }
 
   if (LDSYMLEN (pst))		/* Otherwise it's a dummy.  */
     {

gdb/dwarf2read.c

@@ -9663,29 +9663,11 @@ void
 dwarf2_psymtab::expand_psymtab (struct objfile *objfile)
 {
   struct dwarf2_per_cu_data *per_cu;
-  int i;
 
   if (readin)
     return;
 
-  for (i = 0; i < number_of_dependencies; i++)
+  read_dependencies (objfile);
-    if (!dependencies[i]->readin
-	&& dependencies[i]->user == NULL)
-      {
-        /* Inform about additional files that need to be read in.  */
-        if (info_verbose)
-          {
-	    /* FIXME: i18n: Need to make this a single string.  */
-            fputs_filtered (" ", gdb_stdout);
-            wrap_here ("");
-            fputs_filtered ("and ", gdb_stdout);
-            wrap_here ("");
-            printf_filtered ("%s...", dependencies[i]->filename);
-            wrap_here ("");     /* Flush output.  */
-            gdb_flush (gdb_stdout);
-          }
-	dependencies[i]->expand_psymtab (objfile);
-      }
 
   per_cu = per_cu_data;
 

gdb/mdebugread.c

@@ -3856,24 +3856,7 @@ psymtab_to_symtab_1 (legacy_psymtab *pst, struct objfile *objfile)
   /* Read in all partial symtabs on which this one is dependent.
      NOTE that we do have circular dependencies, sigh.  We solved
      that by setting pst->readin before this point.  */
-
+  pst->read_dependencies (objfile);
-  for (i = 0; i < pst->number_of_dependencies; i++)
-    if (!pst->dependencies[i]->readin)
-      {
-	/* Inform about additional files to be read in.  */
-	if (info_verbose)
-	  {
-	    fputs_filtered (" ", gdb_stdout);
-	    wrap_here ("");
-	    fputs_filtered ("and ", gdb_stdout);
-	    wrap_here ("");
-	    printf_filtered ("%s...",
-			     pst->dependencies[i]->filename);
-	    wrap_here ("");	/* Flush output */
-	    gdb_flush (gdb_stdout);
-	  }
-	pst->dependencies[i]->expand_psymtab (objfile);
-      }
 
   /* Do nothing if this is a dummy psymtab.  */
 

gdb/psympriv.h

@@ -134,6 +134,9 @@ struct partial_symtab
      expand_psymtab can be made.  */
   virtual void expand_psymtab (struct objfile *) = 0;
 
+  /* Ensure that all the dependencies are read in.  */
+  void read_dependencies (struct objfile *);
+
   /* Return the raw low text address of this partial_symtab.  */
   CORE_ADDR raw_text_low () const
   {

gdb/psymtab.c

@@ -1682,6 +1682,32 @@ partial_symtab::partial_symtab (const char *filename_, struct objfile *objfile)
     }
 }
 
+/* See psympriv.h.  */
+
+void
+partial_symtab::read_dependencies (struct objfile *objfile)
+{
+  for (int i = 0; i < number_of_dependencies; ++i)
+    {
+      if (!dependencies[i]->readin)
+	{
+	  /* Inform about additional files to be read in.  */
+	  if (info_verbose)
+	    {
+	      fputs_filtered (" ", gdb_stdout);
+	      wrap_here ("");
+	      fputs_filtered ("and ", gdb_stdout);
+	      wrap_here ("");
+	      printf_filtered ("%s...", dependencies[i]->filename);
+	      wrap_here ("");	/* Flush output */
+	      gdb_flush (gdb_stdout);
+	    }
+	  dependencies[i]->expand_psymtab (objfile);
+	}
+    }
+}
+
+
 void
 psymtab_storage::discard_psymtab (struct partial_symtab *pst)
 {

gdb/xcoffread.c

@@ -1819,36 +1819,10 @@ find_linenos (struct bfd *abfd, struct bfd_section *asect, void *vpinfo)
 static void
 xcoff_psymtab_to_symtab_1 (legacy_psymtab *pst, struct objfile *objfile)
 {
-  int i;
+  gdb_assert (!pst->readin);
-
-  if (!pst)
-    return;
-
-  if (pst->readin)
-    {
-      fprintf_unfiltered
-	(gdb_stderr, "Psymtab for %s already read in.  Shouldn't happen.\n",
-	 pst->filename);
-      return;
-    }
 
   /* Read in all partial symtabs on which this one is dependent.  */
-  for (i = 0; i < pst->number_of_dependencies; i++)
+  pst->read_dependencies (objfile);
-    if (!pst->dependencies[i]->readin)
-      {
-	/* Inform about additional files that need to be read in.  */
-	if (info_verbose)
-	  {
-	    fputs_filtered (" ", gdb_stdout);
-	    wrap_here ("");
-	    fputs_filtered ("and ", gdb_stdout);
-	    wrap_here ("");
-	    printf_filtered ("%s...", pst->dependencies[i]->filename);
-	    wrap_here ("");	/* Flush output */
-	    gdb_flush (gdb_stdout);
-	  }
-	pst->dependencies[i]->expand_psymtab (objfile);
-      }
 
   if (((struct symloc *) pst->read_symtab_private)->numsyms != 0)
     {