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.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@21495 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 9 insertions, 2 deletions

diff --git a/gcc/extend.texi b/gcc/extend.texi
index 736f4220c5a..0fb01f444f5 100644
--- a/gcc/extend.texi
+++ b/gcc/extend.texi
@@ -1286,8 +1286,9 @@ carefully.
 
 The keyword @code{__attribute__} allows you to specify special
 attributes when making a declaration.  This keyword is followed by an
-attribute specification inside double parentheses.  Eight attributes,
-@code{noreturn}, @code{const}, @code{format}, @code{section},
+attribute specification inside double parentheses.  Nine attributes,
+@code{noreturn}, @code{const}, @code{format},
+@code{no_instrument_function}, @code{section},
 @code{constructor}, @code{destructor}, @code{unused} and @code{weak} are
 currently defined for functions.  Other attributes, including
 @code{section} are supported for variables declarations (@pxref{Variable
@@ -1447,6 +1448,12 @@ operands are a call to one of your own function.  The compiler always
 treats @code{gettext}, @code{dgettext}, and @code{dcgettext} in this
 manner.
 
+@item no_instrument_function
+@cindex @code{no_instrument_function} function attribute
+If @samp{-finstrument-functions} is given, profiling function calls will
+be generated at entry and exit of most user-compiled functions.
+Functions with this attribute will not be so instrumented.
+
 @item section ("section-name")
 @cindex @code{section} function attribute
 Normally, the compiler places the code it generates in the @code{text} section.