Remove casts from dwarf2/index-write.c

dwarf2/index-write.c casts pointers to "dwarf2_psymtab *", but as far
as I can tell, it does not actually use any DWARF-specific fields of
the psymtab.  So, this patch changes this code to use partial_symtab
instead.  This removes nearly every cast, leaving just the unavoidable
one from addrmap iteration.

gdb/ChangeLog
2020-02-26  Tom Tromey  <tom@tromey.com>

	* dwarf2/index-write.c (psym_index_map): Change type.
	(add_address_entry_worker, write_one_signatured_type)
	(recursively_count_psymbols, recursively_write_psymbols)
	(class debug_names, psyms_seen_size, write_gdbindex)
	(write_debug_names): Use partial_symtab, not dwarf2_psymtab.

2 files changed, 21 insertions, 13 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 9f2387d..2bb65e7 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,11 @@
+2020-02-26  Tom Tromey  <tom@tromey.com>
+
+	* dwarf2/index-write.c (psym_index_map): Change type.
+	(add_address_entry_worker, write_one_signatured_type)
+	(recursively_count_psymbols, recursively_write_psymbols)
+	(class debug_names, psyms_seen_size, write_gdbindex)
+	(write_debug_names): Use partial_symtab, not dwarf2_psymtab.
+
 2020-02-26  Aaron Merey  <amerey@redhat.com>
 
 	* Makefile.in: Handle optional debuginfod support.
diff --git a/gdb/dwarf2/index-write.c b/gdb/dwarf2/index-write.c
index 2cbf2eb..4b711d0 100644
--- a/gdb/dwarf2/index-write.c
+++ b/gdb/dwarf2/index-write.c
@@ -399,7 +399,7 @@ write_hash_table (mapped_symtab *symtab, data_buf &output, data_buf &cpool)
     }
 }
 
-typedef std::unordered_map<dwarf2_psymtab *, unsigned int> psym_index_map;
+typedef std::unordered_map<partial_symtab *, unsigned int> psym_index_map;
 
 /* Helper struct for building the address table.  */
 struct addrmap_index_data
@@ -439,7 +439,7 @@ static int
 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
 {
   struct addrmap_index_data *data = (struct addrmap_index_data *) datap;
-  dwarf2_psymtab *pst = (dwarf2_psymtab *) obj;
+  partial_symtab *pst = (partial_symtab *) obj;
 
   if (data->previous_valid)
     add_address_entry (data->objfile, data->addr_vec,
@@ -582,7 +582,7 @@ write_one_signatured_type (void **slot, void *d)
   struct signatured_type_index_data *info
     = (struct signatured_type_index_data *) d;
   struct signatured_type *entry = (struct signatured_type *) *slot;
-  dwarf2_psymtab *psymtab = entry->per_cu.v.psymtab;
+  partial_symtab *psymtab = entry->per_cu.v.psymtab;
 
   write_psymbols (info->symtab,
 		  info->psyms_seen,
@@ -612,12 +612,12 @@ write_one_signatured_type (void **slot, void *d)
    if they appeared in this psymtab.  */
 
 static void
-recursively_count_psymbols (dwarf2_psymtab *psymtab,
+recursively_count_psymbols (partial_symtab *psymtab,
 			    size_t &psyms_seen)
 {
   for (int i = 0; i < psymtab->number_of_dependencies; ++i)
     if (psymtab->dependencies[i]->user != NULL)
-      recursively_count_psymbols ((dwarf2_psymtab *) psymtab->dependencies[i],
+      recursively_count_psymbols (psymtab->dependencies[i],
 				  psyms_seen);
 
   psyms_seen += psymtab->n_global_syms;
@@ -629,7 +629,7 @@ recursively_count_psymbols (dwarf2_psymtab *psymtab,
 
 static void
 recursively_write_psymbols (struct objfile *objfile,
-			    dwarf2_psymtab *psymtab,
+			    partial_symtab *psymtab,
 			    struct mapped_symtab *symtab,
 			    std::unordered_set<partial_symbol *> &psyms_seen,
 			    offset_type cu_index)
@@ -639,7 +639,7 @@ recursively_write_psymbols (struct objfile *objfile,
   for (i = 0; i < psymtab->number_of_dependencies; ++i)
     if (psymtab->dependencies[i]->user != NULL)
       recursively_write_psymbols (objfile,
-				  (dwarf2_psymtab *) psymtab->dependencies[i],
+				  psymtab->dependencies[i],
 				  symtab, psyms_seen, cu_index);
 
   write_psymbols (symtab,
@@ -869,14 +869,14 @@ public:
      as if they appeared in this psymtab.  */
   void recursively_write_psymbols
     (struct objfile *objfile,
-     dwarf2_psymtab *psymtab,
+     partial_symtab *psymtab,
      std::unordered_set<partial_symbol *> &psyms_seen,
      int cu_index)
   {
     for (int i = 0; i < psymtab->number_of_dependencies; ++i)
       if (psymtab->dependencies[i]->user != NULL)
 	recursively_write_psymbols
-	  (objfile, (dwarf2_psymtab *) psymtab->dependencies[i], psyms_seen, cu_index);
+	  (objfile, psymtab->dependencies[i], psyms_seen, cu_index);
 
     write_psymbols (psyms_seen,
 		    (objfile->partial_symtabs->global_psymbols.data ()
@@ -1234,7 +1234,7 @@ private:
   write_one_signatured_type (struct signatured_type *entry,
 			     struct signatured_type_index_data *info)
   {
-    dwarf2_psymtab *psymtab = entry->per_cu.v.psymtab;
+    partial_symtab *psymtab = entry->per_cu.v.psymtab;
 
     write_psymbols (info->psyms_seen,
 		    (info->objfile->partial_symtabs->global_psymbols.data ()
@@ -1320,7 +1320,7 @@ psyms_seen_size (struct dwarf2_per_objfile *dwarf2_per_objfile)
   size_t psyms_count = 0;
   for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
     {
-      dwarf2_psymtab *psymtab = per_cu->v.psymtab;
+      partial_symtab *psymtab = per_cu->v.psymtab;
 
       if (psymtab != NULL && psymtab->user == NULL)
 	recursively_count_psymbols (psymtab, psyms_count);
@@ -1423,7 +1423,7 @@ write_gdbindex (struct dwarf2_per_objfile *dwarf2_per_objfile, FILE *out_file,
     {
       struct dwarf2_per_cu_data *per_cu
 	= dwarf2_per_objfile->all_comp_units[i];
-      dwarf2_psymtab *psymtab = per_cu->v.psymtab;
+      partial_symtab *psymtab = per_cu->v.psymtab;
 
       /* CU of a shared file from 'dwz -m' may be unused by this main file.
 	 It may be referenced from a local scope but in such case it does not
@@ -1508,7 +1508,7 @@ write_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile,
   for (int i = 0; i < dwarf2_per_objfile->all_comp_units.size (); ++i)
     {
       const dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->all_comp_units[i];
-      dwarf2_psymtab *psymtab = per_cu->v.psymtab;
+      partial_symtab *psymtab = per_cu->v.psymtab;
 
       /* CU of a shared file from 'dwz -m' may be unused by this main
 	 file.  It may be referenced from a local scope but in such