re PR debug/43293 (Invalid unwind info for i?86 -fpic)

	PR debug/43293
	* target.h (struct gcc_target): Add code_end hook.
	* target-def.h (TARGET_ASM_CODE_END): Define to hook_void_void
	if not yet defined.
	(TARGET_ASM_OUT): Add TARGET_ASM_CODE_END.
	* toplev.c (compile_file): Call targetm.asm_out.code_end
	hook before unwind info/debug info output.
	* config/i386/winnt.c (i386_pe_file_end): Don't call ix86_file_end.
	* config/i386/linux.h (NEED_INDICATE_EXEC_STACK): Don't define.
	(TARGET_ASM_FILE_END): Define to file_end_indicate_exec_stack.
	* config/i386/linux64.h (NEED_INDICATE_EXEC_STACK): Don't define.
	(TARGET_ASM_FILE_END): Define to file_end_indicate_exec_stack.
	* config/i386/i386.c (ix86_file_end): Renamed to...
	(ix86_code_end): ... this.  Make static.  Don't call
	file_end_indicate_exec_stack.  Emit unwind info using
	final_start_function/final_end_function.
	(darwin_x86_file_end): Remove.
	(TARGET_ASM_CODE_END): Define.
	* config/i386/i386.h (TARGET_ASM_FILE_END,
	NEED_INDICATE_EXEC_STACK): Don't define.
	* config/i386/darwin.h (darwin_x86_file_end): Remove prototype.
	(TARGET_ASM_FILE_END): Define to darwin_file_end.
	* config/i386/i386-protos.h (ix86_file_end): Remove prototype.
	* doc/tm.texi (TARGET_ASM_CODE_END): Document.

From-SVN: r157707

gcc/ChangeLog

 2010-03-24  Jakub Jelinek  <jakub@redhat.com>
 
+	PR debug/43293
+	* target.h (struct gcc_target): Add code_end hook.
+	* target-def.h (TARGET_ASM_CODE_END): Define to hook_void_void
+	if not yet defined.
+	(TARGET_ASM_OUT): Add TARGET_ASM_CODE_END.
+	* toplev.c (compile_file): Call targetm.asm_out.code_end
+	hook before unwind info/debug info output.
+	* config/i386/winnt.c (i386_pe_file_end): Don't call ix86_file_end.
+	* config/i386/linux.h (NEED_INDICATE_EXEC_STACK): Don't define.
+	(TARGET_ASM_FILE_END): Define to file_end_indicate_exec_stack.
+	* config/i386/linux64.h (NEED_INDICATE_EXEC_STACK): Don't define.
+	(TARGET_ASM_FILE_END): Define to file_end_indicate_exec_stack.
+	* config/i386/i386.c (ix86_file_end): Renamed to...
+	(ix86_code_end): ... this.  Make static.  Don't call
+	file_end_indicate_exec_stack.  Emit unwind info using
+	final_start_function/final_end_function.
+	(darwin_x86_file_end): Remove.
+	(TARGET_ASM_CODE_END): Define.
+	* config/i386/i386.h (TARGET_ASM_FILE_END,
+	NEED_INDICATE_EXEC_STACK): Don't define.
+	* config/i386/darwin.h (darwin_x86_file_end): Remove prototype.
+	(TARGET_ASM_FILE_END): Define to darwin_file_end.
+	* config/i386/i386-protos.h (ix86_file_end): Remove prototype.
+	* doc/tm.texi (TARGET_ASM_CODE_END): Document.
+
 	PR target/43498
 	* config/i386/i386.c (x86_output_mi_thunk): Call final_start_function
 	at the beginning and final_end_function at the end.

gcc/config/i386/darwin.h

 /* Target definitions for x86 running Darwin.
-   Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007, 2008
+   Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2010
    Free Software Foundation, Inc.
    Contributed by Apple Computer Inc.
 
@@ -141,9 +141,8 @@ along with GCC; see the file COPYING3.  If not see
 
 #define SHIFT_DOUBLE_OMITS_COUNT 0
 
-extern void darwin_x86_file_end (void);
 #undef TARGET_ASM_FILE_END
-#define TARGET_ASM_FILE_END darwin_x86_file_end
+#define TARGET_ASM_FILE_END darwin_file_end
 
 /* Define the syntax of pseudo-ops, labels and comments.  */
 

gcc/config/i386/i386-protos.h

 /* Definitions of target machine for GCC for IA-32.
    Copyright (C) 1988, 1992, 1994, 1995, 1996, 1996, 1997, 1998, 1999,
-   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
    Free Software Foundation, Inc.
 
 This file is part of GCC.
@@ -27,7 +27,6 @@ extern void ix86_conditional_register_usage (void);
 extern int ix86_can_use_return_insn_p (void);
 extern void ix86_setup_frame_addresses (void);
 
-extern void ix86_file_end (void);
 extern HOST_WIDE_INT ix86_initial_elimination_offset (int, int);
 extern void ix86_expand_prologue (void);
 extern void ix86_expand_epilogue (int);

gcc/config/i386/i386.c

@@ -7580,8 +7580,8 @@ get_pc_thunk_name (char name[32], unsigned int regno)
 /* This function generates code for -fpic that loads %ebx with
    the return address of the caller and then returns.  */
 
-void
-ix86_file_end (void)
+static void
+ix86_code_end (void)
 {
   rtx xops[2];
   int regno;
@@ -7589,15 +7589,21 @@ ix86_file_end (void)
   for (regno = 0; regno < 8; ++regno)
     {
       char name[32];
-#ifdef DWARF2_UNWIND_INFO
-      bool do_cfi;
-#endif
+      tree decl;
 
       if (! ((pic_labels_used >> regno) & 1))
 	continue;
 
       get_pc_thunk_name (name, regno);
 
+      decl = build_decl (BUILTINS_LOCATION, FUNCTION_DECL,
+			 get_identifier (name),
+			 build_function_type (void_type_node, void_list_node));
+      DECL_RESULT (decl) = build_decl (BUILTINS_LOCATION, RESULT_DECL,
+				       NULL_TREE, void_type_node);
+      TREE_PUBLIC (decl) = 1;
+      TREE_STATIC (decl) = 1;
+
 #if TARGET_MACHO
       if (TARGET_MACHO)
 	{
@@ -7613,13 +7619,6 @@ ix86_file_end (void)
 #endif
       if (USE_HIDDEN_LINKONCE)
 	{
-	  tree decl;
-
-	  decl = build_decl (BUILTINS_LOCATION,
-			     FUNCTION_DECL, get_identifier (name),
-			     error_mark_node);
-	  TREE_PUBLIC (decl) = 1;
-	  TREE_STATIC (decl) = 1;
 	  DECL_COMDAT_GROUP (decl) = DECL_ASSEMBLER_NAME (decl);
 
 	  (*targetm.asm_out.unique_section) (decl, 0);
@@ -7637,23 +7636,22 @@ ix86_file_end (void)
 	  ASM_OUTPUT_LABEL (asm_out_file, name);
 	}
 
-#ifdef DWARF2_UNWIND_INFO
-      do_cfi = dwarf2out_do_cfi_asm ();
-      if (do_cfi)
-	fprintf (asm_out_file, "\t.cfi_startproc\n");
-#endif
+      DECL_INITIAL (decl) = make_node (BLOCK);
+      current_function_decl = decl;
+      init_function_start (decl);
+      /* Make sure unwind info is emitted for the thunk if needed.  */
+      final_start_function (emit_barrier (), asm_out_file, 1);
+
       xops[0] = gen_rtx_REG (Pmode, regno);
       xops[1] = gen_rtx_MEM (Pmode, stack_pointer_rtx);
       output_asm_insn ("mov%z0\t{%1, %0|%0, %1}", xops);
       output_asm_insn ("ret", xops);
-#ifdef DWARF2_UNWIND_INFO
-      if (do_cfi)
-	fprintf (asm_out_file, "\t.cfi_endproc\n");
-#endif
+      final_end_function ();
+      init_insn_lengths ();
+      free_after_compilation (cfun);
+      set_cfun (NULL);
+      current_function_decl = NULL;
     }
-
-  if (NEED_INDICATE_EXEC_STACK)
-    file_end_indicate_exec_stack ();
 }
 
 /* Emit code for the SET_GOT patterns.  */
@@ -25938,13 +25936,6 @@ machopic_output_stub (FILE *file, const char *symb, const char *stub)
   fprintf (file, "\t.indirect_symbol %s\n", symbol_name);
   fprintf (file, ASM_LONG "%s\n", binder_name);
 }
-
-void
-darwin_x86_file_end (void)
-{
-  darwin_file_end ();
-  ix86_file_end ();
-}
 #endif /* TARGET_MACHO */
 
 /* Order the registers for register allocator.  */
@@ -30550,6 +30541,9 @@ ix86_enum_va_list (int idx, const char **pname, tree *ptree)
 #undef TARGET_CAN_ELIMINATE
 #define TARGET_CAN_ELIMINATE ix86_can_eliminate
 
+#undef TARGET_ASM_CODE_END
+#define TARGET_ASM_CODE_END ix86_code_end
+
 struct gcc_target targetm = TARGET_INITIALIZER;
 
 #include "gt-i386.h"

gcc/config/i386/i386.h

@@ -1627,9 +1627,6 @@ typedef struct ix86_args {
 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
   function_arg (&(CUM), (MODE), (TYPE), (NAMED))
 
-#define TARGET_ASM_FILE_END ix86_file_end
-#define NEED_INDICATE_EXEC_STACK 0
-
 /* Output assembler code to FILE to increment profiler label # LABELNO
    for profiling a function entry.  */
 

gcc/config/i386/linux.h

 /* Definitions for Intel 386 running Linux-based GNU systems with ELF format.
    Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2004, 2005,
-   2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+   2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
    Contributed by Eric Youngdale.
    Modified for stabs-in-ELF by H.J. Lu.
 
@@ -202,8 +202,7 @@ along with GCC; see the file COPYING3.  If not see
 #define LIBGCC2_TF_CEXT q
 #define TF_SIZE 113
 
-#undef NEED_INDICATE_EXEC_STACK
-#define NEED_INDICATE_EXEC_STACK 1
+#define TARGET_ASM_FILE_END file_end_indicate_exec_stack
 
 #define MD_UNWIND_SUPPORT "config/i386/linux-unwind.h"
 

gcc/config/i386/linux64.h

 /* Definitions for AMD x86-64 running Linux-based GNU systems with ELF format.
-   Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009
+   Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009, 2010
    Free Software Foundation, Inc.
    Contributed by Jan Hubicka <jh@suse.cz>, based on linux.h.
 
@@ -105,8 +105,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #define LIBGCC2_TF_CEXT q
 #define TF_SIZE 113
 
-#undef NEED_INDICATE_EXEC_STACK
-#define NEED_INDICATE_EXEC_STACK 1
+#define TARGET_ASM_FILE_END file_end_indicate_exec_stack
 
 #define MD_UNWIND_SUPPORT "config/i386/linux-unwind.h"
 

gcc/config/i386/winnt.c

 /* Subroutines for insn-output.c for Windows NT.
    Contributed by Douglas Rupp (drupp@cs.washington.edu)
    Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
-   2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+   2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -670,8 +670,6 @@ i386_pe_file_end (void)
 {
   struct extern_list *p;
 
-  ix86_file_end ();
-
   for (p = extern_head; p != NULL; p = p->next)
     {
       tree decl;

gcc/doc/tm.texi

@@ -7137,6 +7137,14 @@ need to do other things in that hook, have your hook function call
 this function.
 @end deftypefun
 
+@deftypefn {Target Hook} void TARGET_ASM_CODE_END (void)
+Output to @code{asm_out_file} any text which is needed before emitting
+unwind info and debug info at the end of a file.  Some targets emit
+here PIC setup thunks that cannot be emitted at the end of file,
+because they couldn't have unwind info then.  The default is to output
+nothing.
+@end deftypefn
+
 @defmac ASM_COMMENT_START
 A C string constant describing how to begin a comment in the target
 assembler language.  The compiler assumes that the comment will end at

gcc/target-def.h

 /* Default initializers for a generic GCC target.
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
    Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify it
@@ -204,6 +204,10 @@
 #define TARGET_ASM_FILE_END hook_void_void
 #endif
 
+#ifndef TARGET_ASM_CODE_END
+#define TARGET_ASM_CODE_END hook_void_void
+#endif
+
 #ifndef TARGET_EXTRA_LIVE_ON_ENTRY
 #define TARGET_EXTRA_LIVE_ON_ENTRY hook_void_bitmap
 #endif
@@ -292,6 +296,7 @@
                         TARGET_ASM_CAN_OUTPUT_MI_THUNK,         \
                         TARGET_ASM_FILE_START,                  \
                         TARGET_ASM_FILE_END,			\
+                        TARGET_ASM_CODE_END,			\
 			TARGET_ASM_EXTERNAL_LIBCALL,            \
                         TARGET_ASM_MARK_DECL_PRESERVED,		\
 			TARGET_ASM_RECORD_GCC_SWITCHES,		\

gcc/target.h

 /* Data structure definitions for a generic GCC target.
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
    Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify it
@@ -235,6 +235,10 @@ struct gcc_target
        translation unit.  */
     void (*file_end) (void);
 
+    /* Output any boilerplace text needed at the end of a
+       translation unit before debug and unwind info is emitted.  */
+    void (*code_end) (void);
+
     /* Output an assembler pseudo-op to declare a library function name
        external.  */
     void (*external_libcall) (rtx);

gcc/toplev.c

@@ -1084,6 +1084,10 @@ compile_file (void)
   /* Write out any pending weak symbol declarations.  */
   weak_finish ();
 
+  /* This must be at the end before unwind and debug info.
+     Some target ports emit PIC setup thunks here.  */
+  targetm.asm_out.code_end ();
+
   /* Do dbx symbols.  */
   timevar_push (TV_SYMOUT);