mirror of
https://gcc.gnu.org/git/gcc.git
synced 2024-11-27 13:54:19 +08:00
238 lines
7.1 KiB
C
238 lines
7.1 KiB
C
/* Routines required for instrumenting a program. */
|
|
/* Compile this one with gcc. */
|
|
/* Copyright (C) 1989-2023 Free Software Foundation, Inc.
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free
|
|
Software Foundation; either version 3, or (at your option) any later
|
|
version.
|
|
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
for more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include "libgcov.h"
|
|
#if !defined(inhibit_libc)
|
|
|
|
#ifdef L_gcov_interval_profiler
|
|
/* If VALUE is in interval <START, START + STEPS - 1>, then increases the
|
|
corresponding counter in COUNTERS. If the VALUE is above or below
|
|
the interval, COUNTERS[STEPS] or COUNTERS[STEPS + 1] is increased
|
|
instead. */
|
|
|
|
void
|
|
__gcov_interval_profiler (gcov_type *counters, gcov_type value,
|
|
int start, unsigned steps)
|
|
{
|
|
gcov_type delta = value - start;
|
|
if (delta < 0)
|
|
counters[steps + 1]++;
|
|
else if (delta >= steps)
|
|
counters[steps]++;
|
|
else
|
|
counters[delta]++;
|
|
}
|
|
#endif
|
|
|
|
#if defined(L_gcov_interval_profiler_atomic) && GCOV_SUPPORTS_ATOMIC
|
|
/* If VALUE is in interval <START, START + STEPS - 1>, then increases the
|
|
corresponding counter in COUNTERS. If the VALUE is above or below
|
|
the interval, COUNTERS[STEPS] or COUNTERS[STEPS + 1] is increased
|
|
instead. Function is thread-safe. */
|
|
|
|
void
|
|
__gcov_interval_profiler_atomic (gcov_type *counters, gcov_type value,
|
|
int start, unsigned steps)
|
|
{
|
|
gcov_type delta = value - start;
|
|
if (delta < 0)
|
|
__atomic_fetch_add (&counters[steps + 1], 1, __ATOMIC_RELAXED);
|
|
else if (delta >= steps)
|
|
__atomic_fetch_add (&counters[steps], 1, __ATOMIC_RELAXED);
|
|
else
|
|
__atomic_fetch_add (&counters[delta], 1, __ATOMIC_RELAXED);
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_gcov_pow2_profiler
|
|
/* If VALUE is a power of two, COUNTERS[1] is incremented. Otherwise
|
|
COUNTERS[0] is incremented. */
|
|
|
|
void
|
|
__gcov_pow2_profiler (gcov_type *counters, gcov_type value)
|
|
{
|
|
if (value == 0 || (value & (value - 1)))
|
|
counters[0]++;
|
|
else
|
|
counters[1]++;
|
|
}
|
|
#endif
|
|
|
|
#if defined(L_gcov_pow2_profiler_atomic) && GCOV_SUPPORTS_ATOMIC
|
|
/* If VALUE is a power of two, COUNTERS[1] is incremented. Otherwise
|
|
COUNTERS[0] is incremented. Function is thread-safe. */
|
|
|
|
void
|
|
__gcov_pow2_profiler_atomic (gcov_type *counters, gcov_type value)
|
|
{
|
|
if (value == 0 || (value & (value - 1)))
|
|
__atomic_fetch_add (&counters[0], 1, __ATOMIC_RELAXED);
|
|
else
|
|
__atomic_fetch_add (&counters[1], 1, __ATOMIC_RELAXED);
|
|
}
|
|
#endif
|
|
|
|
/* Tries to determine N most commons value among its inputs. */
|
|
|
|
static inline void
|
|
__gcov_topn_values_profiler_body (gcov_type *counters, gcov_type value,
|
|
int use_atomic)
|
|
{
|
|
gcov_topn_add_value (counters, value, 1, use_atomic, 1);
|
|
}
|
|
|
|
#ifdef L_gcov_topn_values_profiler
|
|
void
|
|
__gcov_topn_values_profiler (gcov_type *counters, gcov_type value)
|
|
{
|
|
__gcov_topn_values_profiler_body (counters, value, 0);
|
|
}
|
|
#endif
|
|
|
|
#if defined(L_gcov_topn_values_profiler_atomic) && GCOV_SUPPORTS_ATOMIC
|
|
|
|
/* Update one value profilers (COUNTERS) for a given VALUE.
|
|
|
|
CAVEAT: Following function is not thread-safe, only total number
|
|
of executions (COUNTERS[2]) is update with an atomic instruction.
|
|
Problem is that one cannot atomically update two counters
|
|
(COUNTERS[0] and COUNTERS[1]), for more information please read
|
|
following email thread:
|
|
https://gcc.gnu.org/ml/gcc-patches/2016-08/msg00024.html. */
|
|
|
|
void
|
|
__gcov_topn_values_profiler_atomic (gcov_type *counters, gcov_type value)
|
|
{
|
|
__gcov_topn_values_profiler_body (counters, value, 1);
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_gcov_indirect_call_profiler_v4
|
|
|
|
/* These two variables are used to actually track caller and callee. Keep
|
|
them in TLS memory so races are not common (they are written to often).
|
|
The variables are set directly by GCC instrumented code, so declaration
|
|
here must match one in tree-profile.c */
|
|
|
|
#if defined(HAVE_CC_TLS) && !defined (USE_EMUTLS)
|
|
__thread
|
|
#endif
|
|
struct indirect_call_tuple __gcov_indirect_call;
|
|
|
|
/* By default, the C++ compiler will use function addresses in the
|
|
vtable entries. Setting TARGET_VTABLE_USES_DESCRIPTORS to nonzero
|
|
tells the compiler to use function descriptors instead. The value
|
|
of this macro says how many words wide the descriptor is (normally 2).
|
|
|
|
It is assumed that the address of a function descriptor may be treated
|
|
as a pointer to a function. */
|
|
|
|
/* Tries to determine the most common value among its inputs. */
|
|
static inline void
|
|
__gcov_indirect_call_profiler_body (gcov_type value, void *cur_func,
|
|
int use_atomic)
|
|
{
|
|
/* If the C++ virtual tables contain function descriptors then one
|
|
function may have multiple descriptors and we need to dereference
|
|
the descriptors to see if they point to the same function. */
|
|
if (cur_func == __gcov_indirect_call.callee
|
|
|| (__LIBGCC_VTABLE_USES_DESCRIPTORS__
|
|
&& *(void **) cur_func == *(void **) __gcov_indirect_call.callee))
|
|
__gcov_topn_values_profiler_body (__gcov_indirect_call.counters, value,
|
|
use_atomic);
|
|
|
|
__gcov_indirect_call.callee = NULL;
|
|
}
|
|
|
|
void
|
|
__gcov_indirect_call_profiler_v4 (gcov_type value, void *cur_func)
|
|
{
|
|
__gcov_indirect_call_profiler_body (value, cur_func, 0);
|
|
}
|
|
|
|
#if GCOV_SUPPORTS_ATOMIC
|
|
void
|
|
__gcov_indirect_call_profiler_v4_atomic (gcov_type value, void *cur_func)
|
|
{
|
|
__gcov_indirect_call_profiler_body (value, cur_func, 1);
|
|
}
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#ifdef L_gcov_time_profiler
|
|
|
|
/* Counter for first visit of each function. */
|
|
gcov_type __gcov_time_profiler_counter ATTRIBUTE_HIDDEN;
|
|
|
|
#endif
|
|
|
|
#ifdef L_gcov_average_profiler
|
|
/* Increase corresponding COUNTER by VALUE. FIXME: Perhaps we want
|
|
to saturate up. */
|
|
|
|
void
|
|
__gcov_average_profiler (gcov_type *counters, gcov_type value)
|
|
{
|
|
counters[0] += value;
|
|
counters[1] ++;
|
|
}
|
|
#endif
|
|
|
|
#if defined(L_gcov_average_profiler_atomic) && GCOV_SUPPORTS_ATOMIC
|
|
/* Increase corresponding COUNTER by VALUE. FIXME: Perhaps we want
|
|
to saturate up. Function is thread-safe. */
|
|
|
|
void
|
|
__gcov_average_profiler_atomic (gcov_type *counters, gcov_type value)
|
|
{
|
|
__atomic_fetch_add (&counters[0], value, __ATOMIC_RELAXED);
|
|
__atomic_fetch_add (&counters[1], 1, __ATOMIC_RELAXED);
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_gcov_ior_profiler
|
|
/* Bitwise-OR VALUE into COUNTER. */
|
|
|
|
void
|
|
__gcov_ior_profiler (gcov_type *counters, gcov_type value)
|
|
{
|
|
*counters |= value;
|
|
}
|
|
#endif
|
|
|
|
#if defined(L_gcov_ior_profiler_atomic) && GCOV_SUPPORTS_ATOMIC
|
|
/* Bitwise-OR VALUE into COUNTER. Function is thread-safe. */
|
|
|
|
void
|
|
__gcov_ior_profiler_atomic (gcov_type *counters, gcov_type value)
|
|
{
|
|
__atomic_fetch_or (&counters[0], value, __ATOMIC_RELAXED);
|
|
}
|
|
#endif
|
|
|
|
|
|
#endif /* inhibit_libc */
|