c-attribs.c (c_common_attribute_table): Add entry for "patchable_function_entry".

2017-07-07  Torsten Duwe  <duwe@suse.de>

        c-family/
	* c-attribs.c (c_common_attribute_table): Add entry for
	"patchable_function_entry".

        lto/
	* lto-lang.c (lto_attribute_table): Add entry for
	"patchable_function_entry".

	* common.opt: Introduce -fpatchable-function-entry
	command line option, and its variables function_entry_patch_area_size
	and function_entry_patch_area_start.
	* opts.c (common_handle_option): Add -fpatchable_function_entry_ case,
	including a two-value parser.
	* target.def (print_patchable_function_entry): New target hook.
	* targhooks.h (default_print_patchable_function_entry): New function.
	* targhooks.c (default_print_patchable_function_entry): Likewise.
	* toplev.c (process_options): Switch off IPA-RA if
	patchable function entries are being generated.
	* varasm.c (assemble_start_function): Look at the
	patchable-function-entry command line switch and current
	function attributes and maybe generate NOP instructions by
	calling the print_patchable_function_entry hook.
	* doc/extend.texi: Document patchable_function_entry attribute.
	* doc/invoke.texi: Document -fpatchable_function_entry
	command line option.
	* doc/tm.texi.in (TARGET_ASM_PRINT_PATCHABLE_FUNCTION_ENTRY):
	New target hook.
	* doc/tm.texi: Re-generate.

	* c-c++-common/patchable_function_entry-default.c: New test.
	* c-c++-common/patchable_function_entry-decl.c: Likewise.
	* c-c++-common/patchable_function_entry-definition.c: Likewise.

From-SVN: r250521

1 files changed, 27 insertions, 0 deletions

diff --git a/gcc/opts.c b/gcc/opts.c
index 3182bc9..ec45a0f 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -2207,6 +2207,33 @@ common_handle_option (struct gcc_options *opts,
         opts->x_flag_ipa_reference = false;
       break;
 
+    case OPT_fpatchable_function_entry_:
+      {
+	char *patch_area_arg = xstrdup (arg);
+	char *comma = strchr (patch_area_arg, ',');
+	if (comma)
+	  {
+	    *comma = '\0';
+	    function_entry_patch_area_size = 
+	      integral_argument (patch_area_arg);
+	    function_entry_patch_area_start =
+	      integral_argument (comma + 1);
+	  }
+	else
+	  {
+	    function_entry_patch_area_size =
+	      integral_argument (patch_area_arg);
+	    function_entry_patch_area_start = 0;
+	  }
+	if (function_entry_patch_area_size < 0
+	    || function_entry_patch_area_start < 0
+	    || function_entry_patch_area_size 
+		< function_entry_patch_area_start)
+	  error ("invalid arguments for %<-fpatchable_function_entry%>");
+	free (patch_area_arg);
+      }
+      break;
+
     case OPT_ftree_vectorize:
       if (!opts_set->x_flag_tree_loop_vectorize)
         opts->x_flag_tree_loop_vectorize = value;