util: Add unit test for stack backtrace caputure
First test never fails, but exercises the code and is useful for manual inspection. Second test exposes the android implementation bug. Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6112>
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@ -289,6 +289,18 @@ if with_tests
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suite : ['util'],
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)
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test(
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'u_debug_stack',
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executable(
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'u_debug_stack_test',
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files('u_debug_stack_test.cpp'),
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include_directories : [inc_include, inc_src, inc_mapi, inc_mesa, inc_gallium, inc_gallium_aux],
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dependencies : [idep_mesautil, idep_gtest],
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c_args : [c_msvc_compat_args],
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),
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suite : ['util'],
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)
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process_test_exe = executable(
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'process_test',
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files('process_test.c'),
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@ -0,0 +1,111 @@
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/*
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* Copyright © 2020 Google, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <stdio.h>
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#include <gtest/gtest.h>
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#include "util/u_debug_stack.h"
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static void __attribute__((noinline))
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func_a(void)
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{
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struct debug_stack_frame backtrace[16];
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fprintf(stderr, "--- backtrace from func_a:\n");
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debug_backtrace_capture(backtrace, 0, 16);
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debug_backtrace_dump(backtrace, 16);
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}
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static void __attribute__((noinline))
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func_b(void)
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{
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struct debug_stack_frame backtrace[16];
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func_a();
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fprintf(stderr, "--- backtrace from func_b:\n");
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debug_backtrace_capture(backtrace, 0, 16);
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debug_backtrace_dump(backtrace, 16);
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}
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static void __attribute__((noinline))
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func_c(struct debug_stack_frame *frames)
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{
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debug_backtrace_capture(frames, 0, 16);
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}
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TEST(u_debug_stack_test, basics)
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{
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struct debug_stack_frame backtrace[16];
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struct debug_stack_frame stored_backtrace[16];
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func_c(stored_backtrace);
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fprintf(stderr, "--- backtrace from main to stderr:\n");
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debug_backtrace_capture(backtrace, 0, 16);
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debug_backtrace_print(stderr, backtrace, 16);
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fprintf(stderr, "--- backtrace from main again to debug_printf:\n");
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debug_backtrace_capture(backtrace, 0, 16);
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debug_backtrace_dump(backtrace, 16);
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func_a();
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func_b();
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fprintf(stderr, "--- stored backtrace from start of main:\n");
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debug_backtrace_dump(stored_backtrace, 16);
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}
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#if _POSIX_C_SOURCE >= 200809L
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TEST(u_debug_stack_test, capture_not_overwritten)
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{
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struct debug_stack_frame backtrace1[16], backtrace2[16];
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FILE *fp;
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char *bt1, *bt2;
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size_t size;
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/* Old android implementation uses one global capture per thread. Test that
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* we can store multiple captures and that they decode to different
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* backtraces.
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*/
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func_c(backtrace1);
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debug_backtrace_capture(backtrace2, 0, 16);
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fp = open_memstream(&bt1, &size);
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debug_backtrace_print(fp, backtrace1, 16);
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fclose(fp);
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fp = open_memstream(&bt2, &size);
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debug_backtrace_print(fp, backtrace2, 16);
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fclose(fp);
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if (size > 0) {
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EXPECT_STRNE(bt1, bt2);
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}
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}
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#endif
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