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[PATCH] Change lookup_symbol's block_index parameter type to block_enum


The only two values valid to pass to the block_index parameter of
quick_symbol_functions::lookup_symbol are GLOBAL_BLOCK and STATIC_BLOCK,
part of enum block_enum.  Change the type of that parameter to
block_enum.

Change also the block_index field of dw2_symtab_iterator in the same
way..  This makes it consistent with dw2_debug_names_iterator, which
already uses block_enum for its block_index field.

This is a follow-up to this thread:

https://sourceware.org/ml/gdb-patches/2019-08/msg00097.html

gdb/ChangeLog:

	* dwarf2read.c (struct dw2_symtab_iterator) <block_index>:
	Change type to gdb::optional<block_enum>.
	(dw2_symtab_iter_init): Change block_index parameter type
	to gdb::optional<block_enum>.
	(dw2_lookup_symbol): Change block_index parameter
	type to block_enum.c
	(dw2_debug_names_lookup_symbol): Likewise.
	* psymtab.c (psym_lookup_symbol): Likewise.
	* symfile-debug.c (debug_qf_lookup_symbol): Likewise.
	* symfile.h (struct quick_symbol_functions) <lookup_symbol>:
	Likewise.
---
 gdb/dwarf2read.c    | 9 ++++-----
 gdb/psymtab.c       | 2 +-
 gdb/symfile-debug.c | 4 ++--
 gdb/symfile.h       | 2 +-
 4 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 3dc34ab5a339..bd8323185fa6 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -3883,7 +3883,7 @@ struct dw2_symtab_iterator
   struct dwarf2_per_objfile *dwarf2_per_objfile;
   /* If set, only look for symbols that match that block.  Valid values are
      GLOBAL_BLOCK and STATIC_BLOCK.  */
-  gdb::optional<int> block_index;
+  gdb::optional<block_enum> block_index;
   /* The kind of symbol we're looking for.  */
   domain_enum domain;
   /* The list of CUs from the index entry of the symbol,
@@ -3905,7 +3905,7 @@ struct dw2_symtab_iterator
 static void
 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
 		      struct dwarf2_per_objfile *dwarf2_per_objfile,
-		      gdb::optional<int> block_index,
+		      gdb::optional<block_enum> block_index,
 		      domain_enum domain,
 		      const char *name)
 {
@@ -4018,7 +4018,7 @@ dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
 }
 
 static struct compunit_symtab *
-dw2_lookup_symbol (struct objfile *objfile, int block_index,
+dw2_lookup_symbol (struct objfile *objfile, block_enum block_index,
 		   const char *name, domain_enum domain)
 {
   struct compunit_symtab *stab_best = NULL;
@@ -6003,10 +6003,9 @@ dw2_debug_names_iterator::next ()
 }
 
 static struct compunit_symtab *
-dw2_debug_names_lookup_symbol (struct objfile *objfile, int block_index_int,
+dw2_debug_names_lookup_symbol (struct objfile *objfile, block_enum block_index,
 			       const char *name, domain_enum domain)
 {
-  const block_enum block_index = static_cast<block_enum> (block_index_int);
   struct dwarf2_per_objfile *dwarf2_per_objfile
     = get_dwarf2_per_objfile (objfile);
 
diff --git a/gdb/psymtab.c b/gdb/psymtab.c
index 6cc7566580ab..0bc38e8428be 100644
--- a/gdb/psymtab.c
+++ b/gdb/psymtab.c
@@ -479,7 +479,7 @@ find_pc_sect_psymbol (struct objfile *objfile,
 
 static struct compunit_symtab *
 psym_lookup_symbol (struct objfile *objfile,
-		    int block_index, const char *name,
+		    block_enum block_index, const char *name,
 		    const domain_enum domain)
 {
   const int psymtab_index = (block_index == GLOBAL_BLOCK ? 1 : 0);
diff --git a/gdb/symfile-debug.c b/gdb/symfile-debug.c
index 0f9da66e536f..c5b565fc517e 100644
--- a/gdb/symfile-debug.c
+++ b/gdb/symfile-debug.c
@@ -140,8 +140,8 @@ debug_qf_map_symtabs_matching_filename
 }
 
 static struct compunit_symtab *
-debug_qf_lookup_symbol (struct objfile *objfile, int kind, const char *name,
-			domain_enum domain)
+debug_qf_lookup_symbol (struct objfile *objfile, block_enum kind,
+			const char *name, domain_enum domain)
 {
   const struct debug_sym_fns_data *debug_data
     = symfile_debug_objfile_data_key.get (objfile);
diff --git a/gdb/symfile.h b/gdb/symfile.h
index 741b085e0c4f..9633a599fd09 100644
--- a/gdb/symfile.h
+++ b/gdb/symfile.h
@@ -179,7 +179,7 @@ struct quick_symbol_functions
      contains !TYPE_OPAQUE symbol prefer its compunit.  If it contains
      only TYPE_OPAQUE symbol(s), return at least that compunit.  */
   struct compunit_symtab *(*lookup_symbol) (struct objfile *objfile,
-					    int block_index, const char *name,
+					    block_enum block_index, const char *name,
 					    domain_enum domain);
 
   /* Print statistics about any indices loaded for OBJFILE.  The
-- 
2.23.0


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