cppfiles.c (stack_include_file): Don't optimize zero-length files.

	* cppfiles.c (stack_include_file): Don't optimize zero-length
	files.
	(read_include_file): NUL-terminate read files.
	* cpplex.c (handle_newline, skip_escaped_newlines,
	get_effective_char, skip_whitespace, parse_identifier,
	parse_identifier_slow, parse_number, parse_string,
	_cpp_lex_direct): Optimize for the fact that buffers are guaranteed
	NUL-terminated.
	* cpplib.c (destringize_and_run, cpp_define, handle_assertion):
	Be sure buffers are NUL terminated.
	* cppmacro.c (warn_of_redefinition): Kill compile warning.

	* c-common.c: Include tree-inline.h.
	(c_language): Move separate definitions here.
	(c_common_init_options, c_common_post_options): New.
	(c_common_lang_init): Rename c_common_init.
	* c-common.h (c_common_lang_init): Similarly.
	(c_common_init_options, c_common_post_options): New.
	* c-lang.c (c_post_options): Move body to c_common_post_options.
	(c_init_options): Use c_common_init_options.
	(c_init): Update.
	* langhooks.def: Rearrange.
	* langhooks.h: Rearrange, and improve comments.
	* toplev.c (do_compile): New function.
	(toplev_main): Use it.
	(lang_independent_f_options, parse_options_and_default_flags,
	process_options): Remove trailing periods.
	* Makefile.in: Update.
cp:	* decl2.c (c_language): Move to c-common.c.
	* lex.c (cxx_post_options, cxx_init_options): Use c-common.c
	functions.
	(cxx_init): Update.
objc:	* objc-act.c (objc_post_options, objc_init_options): Use c-common.c
	functions.
	(ojbc_init): Update.

From-SVN: r47362

1 files changed, 20 insertions, 16 deletions

diff --git a/gcc/langhooks.h b/gcc/langhooks.h
index 4ec01e7..befdb0f 100644
--- a/gcc/langhooks.h
+++ b/gcc/langhooks.h
@@ -71,21 +71,8 @@ struct lang_hooks
      identifier nodes long enough for the language-specific slots.  */
   size_t identifier_size;
 
-  /* Called after options parsing, to initialize the front end.  The
-     main input filename is passed, which may be NULL; the front end
-     should return the original filename (e.g. foo.i -> foo.c).
-     Return NULL to indicate a serious error of some sort; in that
-     case no compilation is performed, and the finish hook is called
-     immediately.  */
-  const char * (*init) PARAMS ((const char *));
-
-  /* Called last, as a finalizer.  */
-  void (*finish) PARAMS ((void));
-
-  /* Called immediately after parsing to clear the binding stack.  */
-  void (*clear_binding_stack) PARAMS ((void));
-
-  /* Called to initialize options, before any calls to decode_option.  */
+  /* The first callback made to the front end, for simple
+     initialization needed before any calls to decode_option.  */
   void (*init_options) PARAMS ((void));
 
   /* Function called with an option vector as argument, to decode a
@@ -98,9 +85,26 @@ struct lang_hooks
      done for this option.  */
   int (*decode_option) PARAMS ((int, char **));
 
-  /* Called when all command line options have been parsed.  */
+  /* Called when all command line options have been parsed.  Should do
+     any required consistency checks, modifications etc.  Complex
+     initialization should be left to the "init" callback, since GC
+     and the identifier hashes are set up between now and then.  */
   void (*post_options) PARAMS ((void));
 
+  /* Called after post_options, to initialize the front end.  The main
+     input filename is passed, which may be NULL; the front end should
+     return the original filename (e.g. foo.i -> foo.c).  Return NULL
+     to indicate a serious error of some sort; in that case no
+     compilation is performed, and the finish hook is called
+     immediately.  */
+  const char * (*init) PARAMS ((const char *));
+
+  /* Called at the end of compilation, as a finalizer.  */
+  void (*finish) PARAMS ((void));
+
+  /* Called immediately after parsing to clear the binding stack.  */
+  void (*clear_binding_stack) PARAMS ((void));
+
   /* Called to obtain the alias set to be used for an expression or type.
      Returns -1 if the language does nothing special for it.  */
   HOST_WIDE_INT (*get_alias_set) PARAMS ((tree));