| /* mtest.c -- Minidebug test for libbacktrace library |
| Copyright (C) 2020-2021 Free Software Foundation, Inc. |
| Written by Ian Lance Taylor, Google. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are |
| met: |
| |
| (1) Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| |
| (2) Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in |
| the documentation and/or other materials provided with the |
| distribution. |
| |
| (3) The name of the author may not be used to |
| endorse or promote products derived from this software without |
| specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, |
| INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| POSSIBILITY OF SUCH DAMAGE. */ |
| |
| /* This program tests using libbacktrace with a program that uses the |
| minidebuginfo format in a .gnu_debugdata section. See |
| https://sourceware.org/gdb/current/onlinedocs/gdb/MiniDebugInfo.html |
| for a bit more information about minidebuginfo. What is relevant |
| for libbacktrace is that we have just a symbol table, with no debug |
| info, so we should be able to do a function backtrace, but we can't |
| do a file/line backtrace. */ |
| |
| #include <assert.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "backtrace.h" |
| #include "backtrace-supported.h" |
| |
| #include "testlib.h" |
| |
| static int test1 (void) __attribute__ ((noinline, noclone, unused)); |
| static int f2 (int) __attribute__ ((noinline, noclone)); |
| static int f3 (int, int) __attribute__ ((noinline, noclone)); |
| |
| /* Collected PC values. */ |
| |
| static uintptr_t addrs[20]; |
| |
| /* The backtrace callback function. This is like callback_one in |
| testlib.c, but it saves the PC also. */ |
| |
| static int |
| callback_mtest (void *vdata, uintptr_t pc, const char *filename, int lineno, |
| const char *function) |
| { |
| struct bdata *data = (struct bdata *) vdata; |
| |
| if (data->index >= sizeof addrs / sizeof addrs[0]) |
| { |
| fprintf (stderr, "callback_mtest: callback called too many times\n"); |
| data->failed = 1; |
| return 1; |
| } |
| |
| addrs[data->index] = pc; |
| |
| return callback_one (vdata, pc, filename, lineno, function); |
| } |
| |
| /* Test the backtrace function with non-inlined functions. (We don't |
| test with inlined functions because they won't work with minidebug |
| anyhow.) */ |
| |
| static int |
| test1 (void) |
| { |
| /* Returning a value here and elsewhere avoids a tailcall which |
| would mess up the backtrace. */ |
| return f2 (__LINE__) + 1; |
| } |
| |
| static int |
| f2 (int f1line) |
| { |
| return f3 (f1line, __LINE__) + 2; |
| } |
| |
| static int |
| f3 (int f1line __attribute__ ((unused)), int f2line __attribute__ ((unused))) |
| { |
| struct info all[20]; |
| struct bdata data; |
| int i; |
| size_t j; |
| |
| data.all = &all[0]; |
| data.index = 0; |
| data.max = 20; |
| data.failed = 0; |
| |
| i = backtrace_full (state, 0, callback_mtest, error_callback_one, &data); |
| |
| if (i != 0) |
| { |
| fprintf (stderr, "test1: unexpected return value %d\n", i); |
| data.failed = 1; |
| } |
| |
| if (data.index < 3) |
| { |
| fprintf (stderr, |
| "test1: not enough frames; got %zu, expected at least 3\n", |
| data.index); |
| data.failed = 1; |
| } |
| |
| /* When using minidebug we don't expect the function name here. */ |
| |
| for (j = 0; j < 3 && j < data.index; j++) |
| { |
| if (all[j].function == NULL) |
| { |
| struct symdata symdata; |
| |
| symdata.name = NULL; |
| symdata.val = 0; |
| symdata.size = 0; |
| symdata.failed = 0; |
| |
| i = backtrace_syminfo (state, addrs[j], callback_three, |
| error_callback_three, &symdata); |
| if (i == 0) |
| { |
| fprintf (stderr, |
| ("test1: [%zu], unexpected return value from " |
| "backtrace_syminfo %d\n"), |
| j, i); |
| data.failed = 1; |
| } |
| else if (symdata.name == NULL) |
| { |
| fprintf (stderr, "test1: [%zu]: syminfo did not find name\n", j); |
| data.failed = 1; |
| } |
| else |
| all[j].function = strdup (symdata.name); |
| } |
| } |
| |
| if (data.index > 0) |
| { |
| if (all[0].function == NULL) |
| { |
| fprintf (stderr, "test1: [0]: missing function name\n"); |
| data.failed = 1; |
| } |
| else if (strcmp (all[0].function, "f3") != 0) |
| { |
| fprintf (stderr, "test1: [0]: got %s expected %s\n", |
| all[0].function, "f3"); |
| data.failed = 1; |
| } |
| } |
| |
| if (data.index > 1) |
| { |
| if (all[1].function == NULL) |
| { |
| fprintf (stderr, "test1: [1]: missing function name\n"); |
| data.failed = 1; |
| } |
| else if (strcmp (all[1].function, "f2") != 0) |
| { |
| fprintf (stderr, "test1: [1]: got %s expected %s\n", |
| all[0].function, "f2"); |
| data.failed = 1; |
| } |
| } |
| |
| if (data.index > 2) |
| { |
| if (all[2].function == NULL) |
| { |
| fprintf (stderr, "test1: [2]: missing function name\n"); |
| data.failed = 1; |
| } |
| else if (strcmp (all[2].function, "test1") != 0) |
| { |
| fprintf (stderr, "test1: [2]: got %s expected %s\n", |
| all[0].function, "test1"); |
| data.failed = 1; |
| } |
| } |
| |
| printf ("%s: backtrace_full noinline\n", data.failed ? "FAIL" : "PASS"); |
| |
| if (data.failed) |
| ++failures; |
| |
| return failures; |
| } |
| |
| /* Test the backtrace_simple function with non-inlined functions. */ |
| |
| static int test3 (void) __attribute__ ((noinline, noclone, unused)); |
| static int f22 (int) __attribute__ ((noinline, noclone)); |
| static int f23 (int, int) __attribute__ ((noinline, noclone)); |
| |
| static int |
| test3 (void) |
| { |
| return f22 (__LINE__) + 1; |
| } |
| |
| static int |
| f22 (int f1line) |
| { |
| return f23 (f1line, __LINE__) + 2; |
| } |
| |
| static int |
| f23 (int f1line __attribute__ ((unused)), int f2line __attribute__ ((unused))) |
| { |
| uintptr_t addrs[20]; |
| struct sdata data; |
| int i; |
| |
| data.addrs = &addrs[0]; |
| data.index = 0; |
| data.max = 20; |
| data.failed = 0; |
| |
| i = backtrace_simple (state, 0, callback_two, error_callback_two, &data); |
| |
| if (i != 0) |
| { |
| fprintf (stderr, "test3: unexpected return value %d\n", i); |
| data.failed = 1; |
| } |
| |
| if (!data.failed) |
| { |
| int j; |
| |
| for (j = 0; j < 3; ++j) |
| { |
| struct symdata symdata; |
| |
| symdata.name = NULL; |
| symdata.val = 0; |
| symdata.size = 0; |
| symdata.failed = 0; |
| |
| i = backtrace_syminfo (state, addrs[j], callback_three, |
| error_callback_three, &symdata); |
| if (i == 0) |
| { |
| fprintf (stderr, |
| ("test3: [%d]: unexpected return value " |
| "from backtrace_syminfo %d\n"), |
| j, i); |
| symdata.failed = 1; |
| } |
| |
| if (!symdata.failed) |
| { |
| const char *expected; |
| |
| switch (j) |
| { |
| case 0: |
| expected = "f23"; |
| break; |
| case 1: |
| expected = "f22"; |
| break; |
| case 2: |
| expected = "test3"; |
| break; |
| default: |
| assert (0); |
| } |
| |
| if (symdata.name == NULL) |
| { |
| fprintf (stderr, "test3: [%d]: NULL syminfo name\n", j); |
| symdata.failed = 1; |
| } |
| /* Use strncmp, not strcmp, because GCC might create a |
| clone. */ |
| else if (strncmp (symdata.name, expected, strlen (expected)) |
| != 0) |
| { |
| fprintf (stderr, |
| ("test3: [%d]: unexpected syminfo name " |
| "got %s expected %s\n"), |
| j, symdata.name, expected); |
| symdata.failed = 1; |
| } |
| } |
| |
| if (symdata.failed) |
| data.failed = 1; |
| } |
| } |
| |
| printf ("%s: backtrace_simple noinline\n", data.failed ? "FAIL" : "PASS"); |
| |
| if (data.failed) |
| ++failures; |
| |
| return failures; |
| } |
| |
| int test5 (void) __attribute__ ((unused)); |
| |
| int global = 1; |
| |
| int |
| test5 (void) |
| { |
| struct symdata symdata; |
| int i; |
| uintptr_t addr = (uintptr_t) &global; |
| |
| if (sizeof (global) > 1) |
| addr += 1; |
| |
| symdata.name = NULL; |
| symdata.val = 0; |
| symdata.size = 0; |
| symdata.failed = 0; |
| |
| i = backtrace_syminfo (state, addr, callback_three, |
| error_callback_three, &symdata); |
| if (i == 0) |
| { |
| fprintf (stderr, |
| "test5: unexpected return value from backtrace_syminfo %d\n", |
| i); |
| symdata.failed = 1; |
| } |
| |
| if (!symdata.failed) |
| { |
| if (symdata.name == NULL) |
| { |
| fprintf (stderr, "test5: NULL syminfo name\n"); |
| symdata.failed = 1; |
| } |
| else if (!(strncmp (symdata.name, "global", 6) == 0 |
| && (symdata.name[6] == '\0'|| symdata.name[6] == '.'))) |
| { |
| fprintf (stderr, |
| "test5: unexpected syminfo name got %s expected %s\n", |
| symdata.name, "global"); |
| symdata.failed = 1; |
| } |
| else if (symdata.val != (uintptr_t) &global) |
| { |
| fprintf (stderr, |
| "test5: unexpected syminfo value got %lx expected %lx\n", |
| (unsigned long) symdata.val, |
| (unsigned long) (uintptr_t) &global); |
| symdata.failed = 1; |
| } |
| else if (symdata.size != sizeof (global)) |
| { |
| fprintf (stderr, |
| "test5: unexpected syminfo size got %lx expected %lx\n", |
| (unsigned long) symdata.size, |
| (unsigned long) sizeof (global)); |
| symdata.failed = 1; |
| } |
| } |
| |
| printf ("%s: backtrace_syminfo variable\n", |
| symdata.failed ? "FAIL" : "PASS"); |
| |
| if (symdata.failed) |
| ++failures; |
| |
| return failures; |
| } |
| |
| int |
| main (int argc ATTRIBUTE_UNUSED, char **argv) |
| { |
| state = backtrace_create_state (argv[0], BACKTRACE_SUPPORTS_THREADS, |
| error_callback_create, NULL); |
| |
| #if BACKTRACE_SUPPORTED |
| test1 (); |
| test3 (); |
| #if BACKTRACE_SUPPORTS_DATA |
| test5 (); |
| #endif |
| #endif |
| |
| exit (failures ? EXIT_FAILURE : EXIT_SUCCESS); |
| } |