+/* Information that is provided by all instances of the section type. */
+struct GTY(()) section_common {
+ /* The set of SECTION_* flags that apply to this section. */
+ unsigned int flags;
+};
+
+/* Information about a SECTION_NAMED section. */
+struct GTY(()) named_section {
+ struct section_common common;
+
+ /* The name of the section. */
+ const char *name;
+
+ /* If nonnull, the VAR_DECL or FUNCTION_DECL with which the
+ section is associated. */
+ tree decl;
+};
+
+/* A callback that writes the assembly code for switching to an unnamed
+ section. The argument provides callback-specific data. */
+typedef void (*unnamed_section_callback) (const void *);
+
+/* Information about a SECTION_UNNAMED section. */
+struct GTY(()) unnamed_section {
+ struct section_common common;
+
+ /* The callback used to switch to the section, and the data that
+ should be passed to the callback. */
+ unnamed_section_callback GTY ((skip)) callback;
+ const void *GTY ((skip)) data;
+
+ /* The next entry in the chain of unnamed sections. */
+ section *next;
+};
+
+/* A callback that writes the assembly code for a decl in a
+ SECTION_NOSWITCH section. DECL is the decl that should be assembled
+ and NAME is the name of its SYMBOL_REF. SIZE is the size of the decl
+ in bytes and ROUNDED is that size rounded up to the next
+ BIGGEST_ALIGNMENT / BITS_PER_UNIT boundary.
+
+ Return true if the callback used DECL_ALIGN to set the object's
+ alignment. A false return value implies that we are relying
+ on the rounded size to align the decl. */
+typedef bool (*noswitch_section_callback) (tree decl, const char *name,
+ unsigned HOST_WIDE_INT size,
+ unsigned HOST_WIDE_INT rounded);
+
+/* Information about a SECTION_NOSWITCH section. */
+struct GTY(()) noswitch_section {
+ struct section_common common;
+
+ /* The callback used to assemble decls in this section. */
+ noswitch_section_callback GTY ((skip)) callback;
+};
+
+/* Information about a section, which may be named or unnamed. */
+union GTY ((desc ("SECTION_STYLE (&(%h))"))) section {
+ struct section_common GTY ((skip)) common;
+ struct named_section GTY ((tag ("SECTION_NAMED"))) named;
+ struct unnamed_section GTY ((tag ("SECTION_UNNAMED"))) unnamed;
+ struct noswitch_section GTY ((tag ("SECTION_NOSWITCH"))) noswitch;
+};
+
+/* Return the style of section SECT. */
+#define SECTION_STYLE(SECT) ((SECT)->common.flags & SECTION_STYLE_MASK)
+
+struct object_block;
+
+/* Special well-known sections. */
+extern GTY(()) section *text_section;
+extern GTY(()) section *data_section;
+extern GTY(()) section *readonly_data_section;
+extern GTY(()) section *sdata_section;
+extern GTY(()) section *ctors_section;
+extern GTY(()) section *dtors_section;
+extern GTY(()) section *bss_section;
+extern GTY(()) section *sbss_section;
+extern GTY(()) section *exception_section;
+extern GTY(()) section *eh_frame_section;
+extern GTY(()) section *tls_comm_section;
+extern GTY(()) section *comm_section;
+extern GTY(()) section *lcomm_section;
+extern GTY(()) section *bss_noswitch_section;
+
+extern GTY(()) section *in_section;
+extern GTY(()) bool in_cold_section_p;
+
+extern section *get_unnamed_section (unsigned int, void (*) (const void *),
+ const void *);
+extern section *get_section (const char *, unsigned int, tree);
+extern section *get_named_section (tree, const char *, int);
+extern void place_block_symbol (rtx);
+extern rtx get_section_anchor (struct object_block *, HOST_WIDE_INT,
+ enum tls_model);
+extern section *mergeable_constant_section (enum machine_mode,
+ unsigned HOST_WIDE_INT,
+ unsigned int);
+extern section *function_section (tree);
+extern section *unlikely_text_section (void);
+extern section *current_function_section (void);
+
+/* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
+ not) section for PRIORITY. */
+extern section *get_cdtor_priority_section (int, bool);
+
+extern bool unlikely_text_section_p (section *);
+extern void switch_to_section (section *);
+extern void output_section_asm_op (const void *);
+
+extern void default_asm_output_source_filename (FILE *, const char *);
+extern void output_file_directive (FILE *, const char *);
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