90 lines
2.1 KiB
C++
90 lines
2.1 KiB
C++
// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
|
|
#include "config.h"
|
|
|
|
#include "base/basictypes.h"
|
|
#include "gperftools/stacktrace.h"
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include "sys/ucontext.h"
|
|
#if HAVE_LIBUNWIND_H
|
|
#include <libunwind.h>
|
|
#endif
|
|
|
|
#include "run_benchmark.h"
|
|
|
|
extern "C" void getcontext_light(ucontext_t *ctx);
|
|
|
|
#define MAX_FRAMES 1024
|
|
static void *frames[MAX_FRAMES];
|
|
|
|
enum measure_mode {
|
|
MODE_NOOP,
|
|
MODE_WITH_CONTEXT,
|
|
MODE_WITHOUT_CONTEXT
|
|
};
|
|
|
|
static int ATTRIBUTE_NOINLINE measure_unwind(int maxlevel, int mode) {
|
|
int n;
|
|
|
|
if (mode == MODE_NOOP)
|
|
return 0;
|
|
|
|
if (mode == MODE_WITH_CONTEXT) {
|
|
ucontext_t uc;
|
|
getcontext_light(&uc);
|
|
n = GetStackTraceWithContext(frames, MAX_FRAMES, 0, &uc);
|
|
} else {
|
|
n = GetStackTrace(frames, MAX_FRAMES, 0);
|
|
}
|
|
if (n < maxlevel) {
|
|
fprintf(stderr, "Expected at least %d frames, got %d\n", maxlevel, n);
|
|
abort();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ATTRIBUTE_NOINLINE frame_forcer(int rv) {
|
|
return rv;
|
|
}
|
|
|
|
static int ATTRIBUTE_NOINLINE f1(int level, int maxlevel, int mode) {
|
|
if (level == maxlevel)
|
|
return frame_forcer(measure_unwind(maxlevel, mode));
|
|
return frame_forcer(f1(level + 1, maxlevel, mode));
|
|
}
|
|
|
|
static void bench_unwind_no_op(long iterations, uintptr_t param) {
|
|
do {
|
|
f1(0, param, MODE_NOOP);
|
|
iterations -= param;
|
|
} while (iterations > 0);
|
|
}
|
|
|
|
static void bench_unwind_context(long iterations, uintptr_t param) {
|
|
do {
|
|
f1(0, param, MODE_WITH_CONTEXT);
|
|
iterations -= param;
|
|
} while (iterations > 0);
|
|
}
|
|
|
|
static void bench_unwind_no_context(long iterations, uintptr_t param) {
|
|
do {
|
|
f1(0, param, MODE_WITHOUT_CONTEXT);
|
|
iterations -= param;
|
|
} while (iterations > 0);
|
|
}
|
|
|
|
int main(void) {
|
|
report_benchmark("unwind_no_op", bench_unwind_no_op, 100);
|
|
report_benchmark("unwind_context", bench_unwind_context, 100);
|
|
report_benchmark("unwind_no_context", bench_unwind_no_context, 100);
|
|
|
|
//// TODO: somehow this fails at linking step. Figure out why this is missing
|
|
// #if HAVE_LIBUNWIND_H
|
|
// unw_set_caching_policy(unw_local_addr_space, UNW_CACHE_PER_THREAD);
|
|
// #endif
|
|
return 0;
|
|
}
|