35b621c5f4
Previously, we'd collect every stack frame and then throw some away when we came to log them. This meant that stack traces were effectively shorter than the buffers that had been allocated for them. This patch only stores frames we'll actually output. Also dynamically call the C++ demangler so we don't have to try to read mangled names. Because no one knows the mangling of operator new[] for int arrays off the top of their head. Bug: 7291287 Change-Id: I42b022fd7cd61675d05171de4c3b2704d058ef2a
145 lines
4.8 KiB
C++
145 lines
4.8 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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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
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* are met:
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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 copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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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
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "debug_stacktrace.h"
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#include <dlfcn.h>
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#include <unistd.h>
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#include <unwind.h>
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#include <sys/types.h>
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#include "debug_format.h"
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#include "debug_mapinfo.h"
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#include "logd.h"
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/* depends how the system includes define this */
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#ifdef HAVE_UNWIND_CONTEXT_STRUCT
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typedef struct _Unwind_Context __unwind_context;
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#else
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typedef _Unwind_Context __unwind_context;
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#endif
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static mapinfo_t* gMapInfo = NULL;
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static void* gDemangler;
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typedef char* (*DemanglerFn)(const char*, char*, size_t*, int*);
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static DemanglerFn gDemanglerFn = NULL;
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__LIBC_HIDDEN__ void backtrace_startup() {
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gMapInfo = mapinfo_create(getpid());
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gDemangler = dlopen("libgccdemangle.so", RTLD_NOW);
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if (gDemangler != NULL) {
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void* sym = dlsym(gDemangler, "__cxa_demangle");
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gDemanglerFn = reinterpret_cast<DemanglerFn>(sym);
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}
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}
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__LIBC_HIDDEN__ void backtrace_shutdown() {
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mapinfo_destroy(gMapInfo);
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dlclose(gDemangler);
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}
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static char* demangle(const char* symbol) {
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if (gDemanglerFn == NULL) {
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return NULL;
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}
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return (*gDemanglerFn)(symbol, NULL, NULL, NULL);
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}
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struct stack_crawl_state_t {
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uintptr_t* frames;
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size_t frame_count;
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size_t max_depth;
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bool have_skipped_self;
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stack_crawl_state_t(uintptr_t* frames, size_t max_depth)
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: frames(frames), frame_count(0), max_depth(max_depth), have_skipped_self(false) {
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}
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};
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static _Unwind_Reason_Code trace_function(__unwind_context* context, void* arg) {
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stack_crawl_state_t* state = static_cast<stack_crawl_state_t*>(arg);
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uintptr_t ip = _Unwind_GetIP(context);
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// The first stack frame is get_backtrace itself. Skip it.
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if (ip != 0 && !state->have_skipped_self) {
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state->have_skipped_self = true;
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return _URC_NO_REASON;
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}
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state->frames[state->frame_count++] = ip;
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return (state->frame_count >= state->max_depth) ? _URC_END_OF_STACK : _URC_NO_REASON;
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}
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__LIBC_HIDDEN__ int get_backtrace(uintptr_t* frames, size_t max_depth) {
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stack_crawl_state_t state(frames, max_depth);
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_Unwind_Backtrace(trace_function, &state);
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return state.frame_count;
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}
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__LIBC_HIDDEN__ void log_backtrace(uintptr_t* frames, size_t frame_count) {
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uintptr_t self_bt[16];
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if (frames == NULL) {
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frame_count = get_backtrace(self_bt, 16);
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frames = self_bt;
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}
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__libc_format_log(ANDROID_LOG_ERROR, "libc",
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"*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n");
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for (size_t i = 0 ; i < frame_count; ++i) {
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void* offset = 0;
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const char* symbol = NULL;
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Dl_info info;
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if (dladdr((void*) frames[i], &info) != 0) {
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offset = info.dli_saddr;
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symbol = info.dli_sname;
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}
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uintptr_t rel_pc;
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const mapinfo_t* mi = (gMapInfo != NULL) ? mapinfo_find(gMapInfo, frames[i], &rel_pc) : NULL;
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const char* soname = (mi != NULL) ? mi->name : info.dli_fname;
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if (soname == NULL) {
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soname = "<unknown>";
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}
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if (symbol != NULL) {
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// TODO: we might need a flag to say whether it's safe to allocate (demangling allocates).
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char* demangled_symbol = demangle(symbol);
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const char* best_name = (demangled_symbol != NULL) ? demangled_symbol : symbol;
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__libc_format_log(ANDROID_LOG_ERROR, "libc", " #%02d pc %08x %s (%s+0x%x)",
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i, rel_pc, soname, best_name, frames[i] - (uintptr_t) offset);
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free(demangled_symbol);
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} else {
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__libc_format_log(ANDROID_LOG_ERROR, "libc", " #%02d pc %08x %s",
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i, rel_pc, soname);
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}
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}
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}
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