libsframe: refactor code for dumping section flags

To prepare code for accommodating new flag additions easily as the
format evolves.

libsframe/
        * sframe-dump.c (SFRAME_HEADER_FLAGS_STR_MAX_LEN): Remove.
        (dump_sframe_header_flags): .. to here. New definition.
        (PRINT_FLAG): New definition.
        (dump_sframe_header): Move some implementation from here ..

libsframe/sframe-dump.c

@@ -23,8 +23,6 @@
 #include <inttypes.h>
 #include "sframe-impl.h"
 
-#define SFRAME_HEADER_FLAGS_STR_MAX_LEN 50
-
 /* Return TRUE if the SFrame section is associated with the aarch64 ABIs.  */
 
 static bool
@@ -40,12 +38,40 @@ is_sframe_abi_arch_aarch64 (sframe_decoder_ctx *sfd_ctx)
   return aarch64_p;
 }
 
+static void
+dump_sframe_header_flags (sframe_decoder_ctx *sfd_ctx)
+{
+  uint8_t flags;
+  const char *prefix = "Flags: ";
+
+  flags = sframe_decoder_get_flags (sfd_ctx);
+  if (!flags)
+    {
+      printf ("%11sNONE\n", prefix);
+      return;
+    }
+
+#define PRINT_FLAG(x) \
+  if (flags & (x)) \
+    { flags = (flags & ~(x)); \
+      printf ("%11s%s%s\n", prefix, #x, flags ? "," : ""); \
+      prefix = " "; \
+    }
+
+  PRINT_FLAG (SFRAME_F_FDE_SORTED);
+  PRINT_FLAG (SFRAME_F_FRAME_POINTER);
+#undef PRINT_FLAG
+
+  /* Print any residual flags, should this implementation be out of sync when
+     new flags are added.  */
+  if (flags)
+    printf ("%11s%d\n", prefix, flags);
+}
+
 static void
 dump_sframe_header (sframe_decoder_ctx *sfd_ctx)
 {
   uint8_t ver;
-  uint8_t flags;
-  char *flags_str;
   const char *ver_str = NULL;
   int8_t cfa_fixed_fp_offset;
   int8_t cfa_fixed_ra_offset;
@@ -57,33 +83,10 @@ dump_sframe_header (sframe_decoder_ctx *sfd_ctx)
 	"SFRAME_VERSION_1",
 	"SFRAME_VERSION_2" };
 
-  /* PS: Keep SFRAME_HEADER_FLAGS_STR_MAX_LEN in sync if adding more members to
-     this array.  */
-  const char *flag_names[]
-    = { "SFRAME_F_FDE_SORTED",
-	"SFRAME_F_FRAME_POINTER" };
-
   ver = sframe_decoder_get_version (sfd_ctx);
   if (ver <= SFRAME_VERSION)
     ver_str = version_names[ver];
 
-  /* Prepare SFrame section flags string.  */
-  flags = header->sfh_preamble.sfp_flags;
-  flags_str = (char*) calloc (SFRAME_HEADER_FLAGS_STR_MAX_LEN, sizeof (char));
-  if (flags)
-    {
-      if (flags & SFRAME_F_FDE_SORTED)
-	strcpy (flags_str, flag_names[0]);
-      if (flags & SFRAME_F_FRAME_POINTER)
-	{
-	  if (strlen (flags_str) > 0)
-	    strcpy (flags_str, ",");
-	  strcpy (flags_str, flag_names[1]);
-	}
-    }
-  else
-    strcpy (flags_str, "NONE");
-
   /* CFA fixed FP and RA offsets.  */
   cfa_fixed_fp_offset = header->sfh_cfa_fixed_fp_offset;
   cfa_fixed_ra_offset = header->sfh_cfa_fixed_ra_offset;
@@ -93,15 +96,15 @@ dump_sframe_header (sframe_decoder_ctx *sfd_ctx)
   printf ("  %s :\n", subsec_name);
   printf ("\n");
   printf ("    Version: %s\n", ver_str);
-  printf ("    Flags: %s\n", flags_str);
+
+  dump_sframe_header_flags (sfd_ctx);
+
   if (cfa_fixed_fp_offset != SFRAME_CFA_FIXED_FP_INVALID)
     printf ("    CFA fixed FP offset: %d\n", cfa_fixed_fp_offset);
   if (cfa_fixed_ra_offset != SFRAME_CFA_FIXED_RA_INVALID)
     printf ("    CFA fixed RA offset: %d\n", cfa_fixed_ra_offset);
   printf ("    Num FDEs: %d\n", sframe_decoder_get_num_fidx (sfd_ctx));
   printf ("    Num FREs: %d\n", header->sfh_num_fres);
-
-  free (flags_str);
 }
 
 static void