refactor usage of compressed_debug_section_type

bfd/ChangeLog:

	* bfd-in.h (bfd_hash_set_default_size): Add COMPRESS_UNKNOWN
	  enum value.
	(struct compressed_type_tuple): New.
	* bfd-in2.h (bfd_hash_set_default_size): Regenerate.
	(struct compressed_type_tuple): Likewise.
	* libbfd.c (ARRAY_SIZE): New macro.
	(bfd_get_compression_algorithm): New function.
	(bfd_get_compression_algorithm_name): Likewise.

gas/ChangeLog:

	* as.c: Do not special-case, use the new functions.

ld/ChangeLog:

	* emultempl/elf.em: Do not special-case, use the new functions.
	* lexsup.c (elf_static_list_options): Likewise.

3 files changed, 70 insertions, 6 deletions

diff --git a/bfd/bfd-in.h b/bfd/bfd-in.h
index 4765ea8..82e33d4 100644
--- a/bfd/bfd-in.h
+++ b/bfd/bfd-in.h
@@ -335,15 +335,23 @@ extern void bfd_hash_traverse
    this size.  */
 extern unsigned long bfd_hash_set_default_size (unsigned long);
 
-/* Types of compressed DWARF debug sections.  We currently support
-   zlib.  */
+/* Types of compressed DWARF debug sections.  */
 enum compressed_debug_section_type
 {
   COMPRESS_DEBUG_NONE = 0,
   COMPRESS_DEBUG = 1 << 0,
   COMPRESS_DEBUG_GNU_ZLIB = COMPRESS_DEBUG | 1 << 1,
   COMPRESS_DEBUG_GABI_ZLIB = COMPRESS_DEBUG | 1 << 2,
-  COMPRESS_DEBUG_ZSTD = COMPRESS_DEBUG | 1 << 3
+  COMPRESS_DEBUG_ZSTD = COMPRESS_DEBUG | 1 << 3,
+  COMPRESS_UNKNOWN = 1 << 4
+};
+
+/* Tuple for compressed_debug_section_type and their name.  */
+
+struct compressed_type_tuple
+{
+  enum compressed_debug_section_type type;
+  const char *name;
 };
 
 /* This structure is used to keep track of stabs in sections
@@ -456,6 +464,12 @@ extern void bfd_free_window
   (bfd_window *);
 extern bool bfd_get_file_window
   (bfd *, file_ptr, bfd_size_type, bfd_window *, bool);
+
+
+extern enum compressed_debug_section_type bfd_get_compression_algorithm
+  (const char *);
+extern const char *bfd_get_compression_algorithm_name
+  (enum compressed_debug_section_type);
 
 /* Externally visible ELF routines.  */
 
diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h
index d9b49a8..25e1806 100644
--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@@ -342,15 +342,23 @@ extern void bfd_hash_traverse
    this size.  */
 extern unsigned long bfd_hash_set_default_size (unsigned long);
 
-/* Types of compressed DWARF debug sections.  We currently support
-   zlib.  */
+/* Types of compressed DWARF debug sections.  */
 enum compressed_debug_section_type
 {
   COMPRESS_DEBUG_NONE = 0,
   COMPRESS_DEBUG = 1 << 0,
   COMPRESS_DEBUG_GNU_ZLIB = COMPRESS_DEBUG | 1 << 1,
   COMPRESS_DEBUG_GABI_ZLIB = COMPRESS_DEBUG | 1 << 2,
-  COMPRESS_DEBUG_ZSTD = COMPRESS_DEBUG | 1 << 3
+  COMPRESS_DEBUG_ZSTD = COMPRESS_DEBUG | 1 << 3,
+  COMPRESS_UNKNOWN = 1 << 4
+};
+
+/* Tuple for compressed_debug_section_type and their name.  */
+
+struct compressed_type_tuple
+{
+  enum compressed_debug_section_type type;
+  const char *name;
 };
 
 /* This structure is used to keep track of stabs in sections
@@ -463,6 +471,12 @@ extern void bfd_free_window
   (bfd_window *);
 extern bool bfd_get_file_window
   (bfd *, file_ptr, bfd_size_type, bfd_window *, bool);
+
+
+extern enum compressed_debug_section_type bfd_get_compression_algorithm
+  (const char *);
+extern const char *bfd_get_compression_algorithm_name
+  (enum compressed_debug_section_type);
 
 /* Externally visible ELF routines.  */
 
diff --git a/bfd/libbfd.c b/bfd/libbfd.c
index d33f341..14e7d8e 100644
--- a/bfd/libbfd.c
+++ b/bfd/libbfd.c
@@ -1244,3 +1244,39 @@ _bfd_generic_init_private_section_data (bfd *ibfd ATTRIBUTE_UNUSED,
 {
   return true;
 }
+
+/* Display texts for type of compressed DWARF debug sections.  */
+static const struct compressed_type_tuple compressed_debug_section_names[] =
+{
+  { COMPRESS_DEBUG_NONE, "none" },
+  { COMPRESS_DEBUG, "zlib" },
+  { COMPRESS_DEBUG_GNU_ZLIB, "zlib-gnu" },
+  { COMPRESS_DEBUG_GABI_ZLIB, "zlib-gabi" },
+  { COMPRESS_DEBUG_ZSTD, "zstd" },
+};
+
+#ifndef ARRAY_SIZE
+#define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
+#endif
+
+/* Return compressed_debug_section_type from a string representation.  */
+enum compressed_debug_section_type
+bfd_get_compression_algorithm (const char *name)
+{
+  for (unsigned i = 0; i < ARRAY_SIZE (compressed_debug_section_names); ++i)
+    if (strcasecmp (compressed_debug_section_names[i].name, name) == 0)
+      return compressed_debug_section_names[i].type;
+
+  return COMPRESS_UNKNOWN;
+}
+
+/* Return compression algorithm name based on the type.  */
+const char *
+bfd_get_compression_algorithm_name (enum compressed_debug_section_type type)
+{
+  for (unsigned i = 0; i < ARRAY_SIZE (compressed_debug_section_names); ++i)
+    if (type == compressed_debug_section_names[i].type)
+      return compressed_debug_section_names[i].name;
+
+  return NULL;
+}