Function entry/exit profiling instrumentation:

* expr.h (profile_function_entry_libfunc, profile_function_exit_libfunc):
Declare new variables.
* optabs.c: Define them here.
(init_optabs): Initialize them.
* tree.h (struct tree_decl): New flag no_instrument_function_entry_exit.
(DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT): New accessor macro.
* c-decl.c (duplicate_decls): Merge it.
* c-common.c (enum attrs): New value A_NO_INSTRUMENT_FUNCTION.
(init_attributes): Use it for "no_instrument_function".
(decl_attributes): Handle it, for functions that have not yet been compiled.
Set decl flag.
* flags.h (flag_instrument_function_entry_exit): Declare new variable.
* toplev.c (flag_instrument_function_entry_exit): Define it here.
(f_options): New option "instrument-functions".
* function.h (struct function): New field instrument_entry_exit.
* function.c (current_function_instrument_entry_exit): New variable.
(push_function_context_to, pop_function_context_from): Save and restore.
(expand_function_start): Set current_ variable, maybe emit return label and
entry profile call.
(expand_function_end): Maybe emit exit profile call.
Testsuite:
* gcc.c-torture/special/eeprof-1.c: New test, for -finstrument-functions.
* gcc.c-torture/special/special.exp: Run it.

From-SVN: r21495

1 files changed, 5 insertions, 1 deletions

diff --git a/gcc/tree.h b/gcc/tree.h
index 703c94e..401e5ee 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -1201,6 +1201,10 @@ struct tree_type
    multiple translation units should be merged.  */
 #define DECL_ONE_ONLY(NODE) (DECL_CHECK (NODE)->decl.transparent_union)
 
+/* Used in FUNCTION_DECLs to indicate that function entry and exit should
+   be instrumented with calls to support routines.  */
+#define DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT(NODE) ((NODE)->decl.no_instrument_function_entry_exit)
+
 /* Additional flags for language-specific uses.  */
 #define DECL_LANG_FLAG_0(NODE) (DECL_CHECK (NODE)->decl.lang_flag_0)
 #define DECL_LANG_FLAG_1(NODE) (DECL_CHECK (NODE)->decl.lang_flag_1)
@@ -1245,7 +1249,6 @@ struct tree_decl
   unsigned static_dtor_flag : 1;
   unsigned artificial_flag : 1;
   unsigned weak_flag : 1;
-  /* room for no more */
 
   unsigned lang_flag_0 : 1;
   unsigned lang_flag_1 : 1;
@@ -1257,6 +1260,7 @@ struct tree_decl
   unsigned lang_flag_7 : 1;
 
   unsigned non_addr_const_p : 1;
+  unsigned no_instrument_function_entry_exit : 1;
 
   /* For a FUNCTION_DECL, if inline, this is the size of frame needed.
      If built-in, this is the code for which built-in function.