124 lines
4.7 KiB
C++
124 lines
4.7 KiB
C++
// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
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// Copyright (c) 2005, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// ---
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// Author: Craig Silverstein
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//
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// This verifies that GetPC works correctly. This test uses a minimum
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// of Google infrastructure, to make it very easy to port to various
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// O/Ses and CPUs and test that GetPC is working.
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#include "config.h"
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#include "getpc.h" // should be first to get the _GNU_SOURCE dfn
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <sys/time.h> // for setitimer
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// Needs to be volatile so compiler doesn't try to optimize it away
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static volatile void* getpc_retval = NULL; // what GetPC returns
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static volatile bool prof_handler_called = false;
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static void prof_handler(int sig, siginfo_t*, void* signal_ucontext) {
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if (!prof_handler_called)
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getpc_retval = GetPC(*reinterpret_cast<ucontext_t*>(signal_ucontext));
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prof_handler_called = true; // only store the retval once
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}
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static void RoutineCallingTheSignal() {
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struct sigaction sa;
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sa.sa_sigaction = prof_handler;
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sa.sa_flags = SA_RESTART | SA_SIGINFO;
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sigemptyset(&sa.sa_mask);
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if (sigaction(SIGPROF, &sa, NULL) != 0) {
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perror("sigaction");
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exit(1);
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}
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struct itimerval timer;
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timer.it_interval.tv_sec = 0;
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timer.it_interval.tv_usec = 1000;
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timer.it_value = timer.it_interval;
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setitimer(ITIMER_PROF, &timer, 0);
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// Now we need to do some work for a while, that doesn't call any
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// other functions, so we can be guaranteed that when the SIGPROF
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// fires, we're the routine executing.
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int r = 0;
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for (int i = 0; !prof_handler_called; ++i) {
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for (int j = 0; j < i; j++) {
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r ^= i;
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r <<= 1;
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r ^= j;
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r >>= 1;
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}
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}
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// Now make sure the above loop doesn't get optimized out
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srand(r);
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}
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// This is an upper bound of how many bytes the instructions for
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// RoutineCallingTheSignal might be. There's probably a more
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// principled way to do this, but I don't know how portable it would be.
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// (The function is 372 bytes when compiled with -g on Mac OS X 10.4.
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// I can imagine it would be even bigger in 64-bit architectures.)
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const int kRoutineSize = 512 * sizeof(void*)/4; // allow 1024 for 64-bit
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int main(int argc, char** argv) {
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RoutineCallingTheSignal();
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// Annoyingly, C++ disallows casting pointer-to-function to
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// pointer-to-object, so we use a C-style cast instead.
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char* expected = (char*)&RoutineCallingTheSignal;
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char* actual = (char*)getpc_retval;
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// For ia64, ppc64v1, and parisc64, the function pointer is actually
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// a struct. For instance, ia64's dl-fptr.h:
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// struct fdesc { /* An FDESC is a function descriptor. */
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// ElfW(Addr) ip; /* code entry point */
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// ElfW(Addr) gp; /* global pointer */
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// };
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// We want the code entry point.
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// NOTE: ppc64 ELFv2 (Little Endian) does not have function pointers
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#if defined(__ia64) || \
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(defined(__powerpc64__) && _CALL_ELF != 2)
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expected = ((char**)expected)[0]; // this is "ip"
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#endif
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if (actual < expected || actual > expected + kRoutineSize) {
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printf("Test FAILED: actual PC: %p, expected PC: %p\n", actual, expected);
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return 1;
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} else {
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printf("PASS\n");
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return 0;
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}
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}
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