+2006-03-02 Richard Sandiford <richard@codesourcery.com>
+
+ * doc/tm.texi (TARGET_HAVE_SWITCHABLE_BSS_SECTIONS): Document.
+ (ASM_OUTPUT_BSS): Describe the two ways of handling global BSS,
+ and say that only one is needed.
+ * doc/rtl.texi (SYMBOL_REF_BLOCK): Say that the block can be null.
+ * target.h (have_switchable_bss_sections): New hook.
+ * explow.c (use_anchored_address): Check that the symbol is in a block.
+ * varasm.c (tls_comm_section, comm_section, lcomm_section)
+ (bss_noswitch_section): New variables.
+ (get_unnamed_section): Add SECTION_UNNAMED to the flags.
+ (get_noswitch_section): New function.
+ (get_block_for_section): Allow SECT to be null.
+ (unlikely_text_section_p): Use SECTION_STYLE.
+ (bss_initializer_p): New function.
+ (get_variable_section): Move earlier in file. Take a new argument,
+ prefer_noswitch_p. Move bss checks from assemble_variable to here.
+ Return one of the new *_sections in such cases.
+ (get_block_for_decl): New function, extracting some logic from
+ use_blocks_for_decl_p.
+ (change_symbol_section): Remove in favor of...
+ (change_symbol_block): ...this new function.
+ (use_blocks_for_decl_p): Remove checks now performed by
+ get_block_for_decl.
+ (make_decl_rtl): Use change_symbol_block and get_block_for_decl.
+ (ASM_EMIT_LOCAL, ASM_EMIT_BSS, ASM_EMIT_COMMON): Delete in favor of...
+ (emit_local, emit_bss, emit_common): ...these new functions.
+ Return true if the alignment was honored.
+ (emit_tls_common): New function.
+ (asm_emit_uninitialised): Delete.
+ (assemble_variable_noswitch): New function, split out from...
+ (assemble_variable): ...here. Don't make decisions about common
+ variables here. Globalize all public decls that go into non-common
+ sections. Check whether SYMBOL_REF_BLOCK is null.
+ (output_constant_def_contents): Check whether SYMBOL_REF_BLOCK is null.
+ (output_constant_pool): Likewise.
+ (init_varasm_once): Initialize the new section variables.
+ (have_global_bss_p): New function.
+ (categorize_decl_for_section): Use bss_initializer_p.
+ (switch_to_section): Use SECTION_STYLE. Abort for SECTION_NOSWITCH.
+ (place_block_symbol): Assert that the symbol must be in a block.
+ * target-def.h (TARGET_HAVE_SWITCHABLE_BSS_SECTIONS): New macro.
+ (TARGET_INITIALIZER): Include it.
+ * rtl.h (SYMBOL_REF_BLOCK): Document the null alternative.
+ * output.h (SECTION_STYLE_MASK, SECTION_COMMON): New macros.
+ (SECTION_MACH_DEP): Bump by two.
+ (SECTION_UNNAMED, SECTION_NOSWITCH): New macros.
+ (unnamed_section): Mention SECTION_UNNAMED in comment.
+ (named_section): Likewise SECTION_NAMED.
+ (noswitch_section_callback): New type.
+ (noswitch_section): New structure.
+ (section): Add a noswitch_section alternative.
+ (SECTION_STYLE): New macro.
+ (tls_comm_section, comm_section, lcomm_section): Declare.
+ (bss_noswitch_section, have_global_bss_p): Declare.
+ * config/elfos.h (TARGET_HAVE_SWITCHABLE_BSS_SECTIONS): Override.
+ * config/iq2000/iq2000.c (TARGET_HAVE_SWITCHABLE_BSS_SECTIONS):
+ Override.
+ * config/v850/v850.c (TARGET_HAVE_SWITCHABLE_BSS_SECTIONS): Override.
+ * config/stormy16/stormy16.c (TARGET_HAVE_SWITCHABLE_BSS_SECTIONS):
+ Override.
+
2006-03-02 Daniel Berlin <dberlin@dberlin.org>
* gcc/tree-vrp.c (execute_vrp): Return value.
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