[PATCH v2 20/31] Convert coffread.c to type-safe registry API

[Tom Tromey <tom@tromey.com>]

This changes coffread.c to use the type-safe registry API.

2019-05-01  Tom Tromey  <tom@tromey.com>

	* coffread.c (struct coff_symfile_info): Add initializers.
	(coff_objfile_data_key): Move lower.  Change type.
	(coff_symfile_init, coff_symfile_read, _initialize_coffread):
	Update.
	(coff_free_info): Remove.
---
 gdb/ChangeLog  |  8 ++++++++
 gdb/coffread.c | 38 ++++++++++++--------------------------
 2 files changed, 20 insertions(+), 26 deletions(-)

diff --git a/gdb/coffread.c b/gdb/coffread.c
index 4354741ab64..0956f3897b4 100644
--- a/gdb/coffread.c
+++ b/gdb/coffread.c
@@ -43,26 +43,26 @@
 #include "psymtab.h"
 #include "build-id.h"
 
-/* Key for COFF-associated data.  */
-
-static const struct objfile_data *coff_objfile_data_key;
-
 /* The objfile we are currently reading.  */
 
 static struct objfile *coffread_objfile;
 
 struct coff_symfile_info
   {
-    file_ptr min_lineno_offset;	/* Where in file lowest line#s are.  */
-    file_ptr max_lineno_offset;	/* 1+last byte of line#s in file.  */
+    file_ptr min_lineno_offset = 0;	/* Where in file lowest line#s are.  */
+    file_ptr max_lineno_offset = 0;	/* 1+last byte of line#s in file.  */
 
-    CORE_ADDR textaddr;		/* Addr of .text section.  */
-    unsigned int textsize;	/* Size of .text section.  */
+    CORE_ADDR textaddr = 0;		/* Addr of .text section.  */
+    unsigned int textsize = 0;	/* Size of .text section.  */
     std::vector<asection *> *stabsects;	/* .stab sections.  */
-    asection *stabstrsect;	/* Section pointer for .stab section.  */
-    char *stabstrdata;
+    asection *stabstrsect = nullptr;	/* Section pointer for .stab section.  */
+    char *stabstrdata = nullptr;
   };
 
+/* Key for COFF-associated data.  */
+
+static const struct objfile_key<coff_symfile_info> coff_objfile_data_key;
+
 /* Translate an external name string into a user-visible name.  */
 #define	EXTERNAL_NAME(string, abfd) \
 	(string[0] == bfd_get_symbol_leading_char (abfd) \
@@ -485,15 +485,13 @@ static void
 coff_symfile_init (struct objfile *objfile)
 {
   struct dbx_symfile_info *dbx;
-  struct coff_symfile_info *coff;
 
   /* Allocate struct to keep track of stab reading.  */
   dbx = XCNEW (struct dbx_symfile_info);
   set_objfile_data (objfile, dbx_objfile_data_key, dbx);
 
   /* Allocate struct to keep track of the symfile.  */
-  coff = XCNEW (struct coff_symfile_info);
-  set_objfile_data (objfile, coff_objfile_data_key, coff);
+  coff_objfile_data_key.emplace (objfile);
 
   /* COFF objects may be reordered, so set OBJF_REORDERED.  If we
      find this causes a significant slowdown in gdb then we could
@@ -554,8 +552,7 @@ coff_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags)
   int stringtab_offset;
   int stabstrsize;
   
-  info = (struct coff_symfile_info *) objfile_data (objfile,
-						    coff_objfile_data_key);
+  info = coff_objfile_data_key.get (objfile);
   symfile_bfd = abfd;		/* Kludge for swap routines.  */
 
   std::vector<asection *> stabsects;
@@ -2211,22 +2208,11 @@ static const struct sym_fns coff_sym_fns =
   &psym_functions
 };
 
-/* Free the per-objfile COFF data.  */
-
-static void
-coff_free_info (struct objfile *objfile, void *arg)
-{
-  xfree (arg);
-}
-
 void
 _initialize_coffread (void)
 {
   add_symtab_fns (bfd_target_coff_flavour, &coff_sym_fns);
 
-  coff_objfile_data_key = register_objfile_data_with_cleanup (NULL,
-							      coff_free_info);
-
   coff_register_index
     = register_symbol_register_impl (LOC_REGISTER, &coff_register_funcs);
 }
-- 
2.17.2