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