From 791b0dc5ba32ace51fb8214cdb0cf769b91a024c Mon Sep 17 00:00:00 2001
From: Dominik Vogt <vogt@linux.vnet.ibm.com>
Date: Wed, 29 Jul 2015 16:14:23 +0100
Subject: [PATCH] Add new hooks asm_out.function_start and
 asm_out.function_end.

They are used by the implementation of __attribute__ ((target(...))) on S390.
---
 gcc/doc/tm.texi    | 10 ++++++++++
 gcc/doc/tm.texi.in |  4 ++++
 gcc/hooks.c        |  7 +++++++
 gcc/hooks.h        |  1 +
 gcc/target.def     | 16 ++++++++++++++++
 gcc/varasm.c       |  2 ++
 6 files changed, 40 insertions(+)

diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index d548d96..62d83db 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -7348,6 +7348,16 @@ Output to @code{asm_out_file} any text which the assembler expects
 to find at the end of a file.  The default is to output nothing.
 @end deftypefn
 
+@deftypefn {Target Hook} void TARGET_ASM_FUNCTION_START (FILE *@var{}, @var{tree})
+Output to @code{asm_out_file} any text which is necessary at the start of
+a function.  The default is to output nothing.
+@end deftypefn
+
+@deftypefn {Target Hook} void TARGET_ASM_FUNCTION_END (FILE *@var{}, @var{tree})
+Output to @code{asm_out_file} any text which is necessary at the end of a
+function.  The default is to output nothing.
+@end deftypefn
+
 @deftypefun void file_end_indicate_exec_stack ()
 Some systems use a common convention, the @samp{.note.GNU-stack}
 special section, to indicate whether or not an object file relies on
diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in
index 9bef4a5..b1c4b96 100644
--- a/gcc/doc/tm.texi.in
+++ b/gcc/doc/tm.texi.in
@@ -5122,6 +5122,10 @@ This describes the overall framework of an assembly file.
 
 @hook TARGET_ASM_FILE_END
 
+@hook TARGET_ASM_FUNCTION_START
+
+@hook TARGET_ASM_FUNCTION_END
+
 @deftypefun void file_end_indicate_exec_stack ()
 Some systems use a common convention, the @samp{.note.GNU-stack}
 special section, to indicate whether or not an object file relies on
diff --git a/gcc/hooks.c b/gcc/hooks.c
index 0fb9add..3440e06 100644
--- a/gcc/hooks.c
+++ b/gcc/hooks.c
@@ -146,6 +146,13 @@ hook_void_FILEptr_constcharptr_const_tree (FILE *, const char *, const_tree)
 {
 }
 
+/* Generic hook that takes (FILE *, tree) and does
+   nothing.  */
+void
+hook_void_FILEptr_tree (FILE *, tree)
+{
+}
+
 /* Generic hook that takes (FILE *, rtx) and returns false.  */
 bool
 hook_bool_FILEptr_rtx_false (FILE *a ATTRIBUTE_UNUSED,
diff --git a/gcc/hooks.h b/gcc/hooks.h
index c3d4bd3..bbd26cb 100644
--- a/gcc/hooks.h
+++ b/gcc/hooks.h
@@ -70,6 +70,7 @@ extern void hook_void_rtx_insn_int (rtx_insn *, int);
 extern void hook_void_FILEptr_constcharptr (FILE *, const char *);
 extern void hook_void_FILEptr_constcharptr_const_tree (FILE *, const char *,
 						       const_tree);
+extern void hook_void_FILEptr_tree (FILE *, tree);
 extern bool hook_bool_FILEptr_rtx_false (FILE *, rtx);
 extern void hook_void_rtx_tree (rtx, tree);
 extern void hook_void_tree (tree);
diff --git a/gcc/target.def b/gcc/target.def
index aa5a1f1..4a18be5 100644
--- a/gcc/target.def
+++ b/gcc/target.def
@@ -672,6 +672,22 @@ to find at the end of a file.  The default is to output nothing.",
  void, (void),
  hook_void_void)
 
+/* Output additional text at the start of a function.  */
+DEFHOOK
+(function_start,
+ "Output to @code{asm_out_file} any text which is necessary at the start of\n\
+a function.  The default is to output nothing.",
+ void, (FILE *, tree),
+ hook_void_FILEptr_tree)
+
+/* Output additional text at the end of a function.  */
+DEFHOOK
+(function_end,
+ "Output to @code{asm_out_file} any text which is necessary at the end of a\n\
+function.  The default is to output nothing.",
+ void, (FILE *, tree),
+ hook_void_FILEptr_tree)
+
 /* Output any boilerplate text needed at the beginning of an
    LTO output stream.  */
 DEFHOOK
diff --git a/gcc/varasm.c b/gcc/varasm.c
index 706e652..1b6f7b7 100644
--- a/gcc/varasm.c
+++ b/gcc/varasm.c
@@ -1701,6 +1701,7 @@ assemble_start_function (tree decl, const char *fnname)
   char tmp_label[100];
   bool hot_label_written = false;
 
+  targetm.asm_out.function_start (asm_out_file, current_function_decl);
   if (flag_reorder_blocks_and_partition)
     {
       ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
@@ -1864,6 +1865,7 @@ assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
       ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_end_label);
       switch_to_section (save_text_section);
     }
+  targetm.asm_out.function_end (asm_out_file, current_function_decl);
 }
 
 /* Assemble code to leave SIZE bytes of zeros.  */
-- 
2.3.0