/*
* ut_dump_backtrace -- dump stacktrace to error log using libunwind
*/
void
ut_dump_backtrace(void)
{
unw_context_t context;
unw_proc_info_t pip;
pip.unwind_info = NULL;
int ret = unw_getcontext(&context);
if (ret) {
ERR("unw_getcontext: %s [%d]", unw_strerror(ret), ret);
return;
}
unw_cursor_t cursor;
ret = unw_init_local(&cursor, &context);
if (ret) {
ERR("unw_init_local: %s [%d]", unw_strerror(ret), ret);
return;
}
ret = unw_step(&cursor);
char procname[PROCNAMELEN];
unsigned i = 0;
while (ret > 0) {
ret = unw_get_proc_info(&cursor, &pip);
if (ret) {
ERR("unw_get_proc_info: %s [%d]", unw_strerror(ret),
ret);
break;
}
unw_word_t off;
ret = unw_get_proc_name(&cursor, procname, PROCNAMELEN, &off);
if (ret && ret != -UNW_ENOMEM) {
if (ret != -UNW_EUNSPEC) {
ERR("unw_get_proc_name: %s [%d]",
unw_strerror(ret), ret);
}
strcpy(procname, "?");
}
void *ptr = (void *)(pip.start_ip + off);
Dl_info dlinfo;
const char *fname = "?";
if (dladdr(ptr, &dlinfo) && dlinfo.dli_fname &&
*dlinfo.dli_fname)
fname = dlinfo.dli_fname;
ERR("%u: %s (%s%s+0x%lx) [%p]", i++, fname, procname,
ret == -UNW_ENOMEM ? "..." : "", off, ptr);
ret = unw_step(&cursor);
if (ret < 0)
ERR("unw_step: %s [%d]", unw_strerror(ret), ret);
}
}
vector<long> StackUnwind::fullUnwind() {
#ifdef MAKE_DYNA
return dynaUnwind();
#endif
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
vector<long> call_stack;
/* Need to step twice to remove mention of WMTrace from the call stack */
if (unw_step(&cursor) <= 0)
return call_stack;
if (unw_step(&cursor) <= 0)
return call_stack;
int counter = 0;
while (unw_step(&cursor) > 0 && counter < unw_max_depth) {
unw_get_reg(&cursor, UNW_REG_IP, &ip);
call_stack.push_back((long) ip);
counter++;
}
return call_stack;
}
int xbt_libunwind_backtrace(void** bt, int size){
int i = 0;
for(i=0; i < size; i++)
bt[i] = nullptr;
i=0;
unw_cursor_t c;
unw_context_t uc;
unw_getcontext (&uc);
unw_init_local (&c, &uc);
unw_word_t ip;
unw_step(&c);
while(unw_step(&c) >= 0 && i < size){
unw_get_reg(&c, UNW_REG_IP, &ip);
bt[i] = (void*)(long)ip;
i++;
}
return i;
}
int
backtrace(void **trace, int size)
{
unw_cursor_t cursor; unw_context_t uc;
unw_word_t ip;
int n = 0;
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
while (unw_step(&cursor) > 0) {
unw_get_reg(&cursor, UNW_REG_IP, &ip);
trace[n++] = (void *)ip;
{
char buf[256];
unw_get_proc_name(&cursor, buf, 256, &ip);
if (strncmp("_sigtramp", buf, sizeof("_sigtramp")) == 0) {
goto darwin_sigtramp;
}
}
}
return n;
darwin_sigtramp:
/* darwin's bundled libunwind doesn't support signal trampoline */
{
ucontext_t *uctx;
/* get _sigtramp's ucontext_t and set values to cursor
* http://www.opensource.apple.com/source/Libc/Libc-825.25/i386/sys/_sigtramp.s
* http://www.opensource.apple.com/source/libunwind/libunwind-35.1/src/unw_getcontext.s
*/
unw_get_reg(&cursor, UNW_X86_64_RBX, &ip);
uctx = (ucontext_t *)ip;
unw_set_reg(&cursor, UNW_X86_64_RAX, uctx->uc_mcontext->__ss.__rax);
unw_set_reg(&cursor, UNW_X86_64_RBX, uctx->uc_mcontext->__ss.__rbx);
unw_set_reg(&cursor, UNW_X86_64_RCX, uctx->uc_mcontext->__ss.__rcx);
unw_set_reg(&cursor, UNW_X86_64_RDX, uctx->uc_mcontext->__ss.__rdx);
unw_set_reg(&cursor, UNW_X86_64_RDI, uctx->uc_mcontext->__ss.__rdi);
unw_set_reg(&cursor, UNW_X86_64_RSI, uctx->uc_mcontext->__ss.__rsi);
unw_set_reg(&cursor, UNW_X86_64_RBP, uctx->uc_mcontext->__ss.__rbp);
unw_set_reg(&cursor, UNW_X86_64_RSP, 8+(uctx->uc_mcontext->__ss.__rsp));
unw_set_reg(&cursor, UNW_X86_64_R8, uctx->uc_mcontext->__ss.__r8);
unw_set_reg(&cursor, UNW_X86_64_R9, uctx->uc_mcontext->__ss.__r9);
unw_set_reg(&cursor, UNW_X86_64_R10, uctx->uc_mcontext->__ss.__r10);
unw_set_reg(&cursor, UNW_X86_64_R11, uctx->uc_mcontext->__ss.__r11);
unw_set_reg(&cursor, UNW_X86_64_R12, uctx->uc_mcontext->__ss.__r12);
unw_set_reg(&cursor, UNW_X86_64_R13, uctx->uc_mcontext->__ss.__r13);
unw_set_reg(&cursor, UNW_X86_64_R14, uctx->uc_mcontext->__ss.__r14);
unw_set_reg(&cursor, UNW_X86_64_R15, uctx->uc_mcontext->__ss.__r15);
ip = *(unw_word_t*)uctx->uc_mcontext->__ss.__rsp;
unw_set_reg(&cursor, UNW_REG_IP, ip);
trace[n++] = (void *)uctx->uc_mcontext->__ss.__rip;
trace[n++] = (void *)ip;
}
while (unw_step(&cursor) > 0) {
unw_get_reg(&cursor, UNW_REG_IP, &ip);
trace[n++] = (void *)ip;
}
return n;
}
void
fill_in_backtrace(FaultData* fdp)
{
unw_context_t uc;
unw_cursor_t c;
int i, boff;
memset(&uc, 0, sizeof(uc));
memset(&c, 0, sizeof(c));
if (unw_getcontext(&uc) < 0) {
abort();
}
if (unw_init_local(&c, &uc) < 0) {
abort();
}
// Skip the signal handler, and the signal trampoline
for (i = 0; i < SKIP_FRAME_COUNT; i++) {
if (unw_step(&c) <= 0) {
break;
}
}
memset(fdp->frame, 0, sizeof(fdp->frame));
fdp->frame_count = 0;
boff = 0;
do {
char fn[256];
unw_word_t off, ip;
Dl_info dli;
unw_proc_info_t pi;
unw_get_reg (&c, UNW_REG_IP, &ip);
fdp->frame[fdp->frame_count].addr = (uintptr_t) ip;
fdp->frame[fdp->frame_count].procname = (uintptr_t) &fdp->backtrace_buf[boff];
unw_get_proc_name(&c, (char *) fdp->frame[fdp->frame_count].procname, sizeof(fdp->backtrace_buf) - boff, &off);
unw_get_proc_info(&c, &pi);
boff += strlen((char *) fdp->frame[fdp->frame_count].procname) + 1;
fdp->frame[fdp->frame_count].libname = (uintptr_t) &fdp->backtrace_buf[boff];
dladdr((void *)(uintptr_t) ip, &dli);
strcpy((char *) (uintptr_t) fdp->frame[fdp->frame_count].libname, dli.dli_fname);
boff += strlen((char *) fdp->frame[fdp->frame_count].libname) + 1;
fdp->frame_count++;
} while (unw_step(&c) > 0);
}
ssize_t getStackTraceSafe(uintptr_t* addresses, size_t maxAddresses) {
if (maxAddresses == 0) {
return 0;
}
unw_context_t context;
if (unw_getcontext(&context) < 0) {
return -1;
}
unw_cursor_t cursor;
if (unw_init_local(&cursor, &context) < 0) {
return -1;
}
if (!getFrameInfo(&cursor, *addresses)) {
return -1;
}
++addresses;
size_t count = 1;
for (; count != maxAddresses; ++count, ++addresses) {
int r = unw_step(&cursor);
if (r < 0) {
return -1;
}
if (r == 0) {
break;
}
if (!getFrameInfo(&cursor, *addresses)) {
return -1;
}
}
return count;
}
void dumpStack(FILE* file, unw_cursor_t cursor)
{
int nframe = 0;
char buffer[100];
unw_word_t off;
do {
const char * name = !unw_get_proc_name(&cursor, buffer, 100, &off) ? buffer : "?";
int status;
// Unmangle C++ names:
char* realname = abi::__cxa_demangle(name, 0, 0, &status);
#if defined(__x86_64__)
unw_word_t rip = 0;
unw_word_t rsp = 0;
unw_get_reg(&cursor, UNW_X86_64_RIP, &rip);
unw_get_reg(&cursor, UNW_X86_64_RSP, &rsp);
fprintf(file, " %i: %s (RIP=0x%" PRIx64 " RSP=0x%" PRIx64 ")\n",
nframe, realname ? realname : name, (std::uint64_t) rip, (std::uint64_t) rsp);
#else
fprintf(file, " %i: %s\n", nframe, realname ? realname : name);
#endif
free(realname);
++nframe;
} while(unw_step(&cursor));
}
void backtrace() {
unw_cursor_t cursor;
unw_context_t context;
// Initialize cursor to current frame for local unwinding.
unw_getcontext(&context);
unw_init_local(&cursor, &context);
// Unwind frames one by one, going up the frame stack.
while (unw_step(&cursor) > 0) {
unw_word_t offset, pc;
unw_get_reg(&cursor, UNW_REG_IP, &pc);
if (pc == 0) {
break;
}
printf("0x%lx:", pc);
char sym[256];
if (unw_get_proc_name(&cursor, sym, sizeof(sym), &offset) == 0) {
char* nameptr = sym;
int status;
char* demangled = abi::__cxa_demangle(sym, nullptr, nullptr, &status);
if (status == 0) {
nameptr = demangled;
}
char file[256];
int line = 0;
getFileAndLine((long)pc, file, 256, &line);
printf(" (%s+0x%lx) in %s:%d\n", nameptr, offset, file, line);
free(demangled);
} else {
printf(" -- error: unable to obtain symbol name for this frame\n");
}
}
}
static void
print_trace (void)
{
#ifdef HAVE_LIBUNWIND
unw_context_t uc;
unw_cursor_t cursor;
guint stack_num = 0;
if (!display_filter (DISPLAY_FLAG_BACKTRACE))
return;
unw_getcontext (&uc);
unw_init_local (&cursor, &uc);
while (unw_step (&cursor) > 0)
{
gchar name[129];
unw_word_t off;
int result;
result = unw_get_proc_name (&cursor, name, sizeof (name) - 1, &off);
if (result < 0 && result != UNW_ENOMEM)
{
g_print ("Error getting proc name\n");
break;
}
g_print ("#%d %s + [0x%08x]\n", stack_num++, name, (unsigned int)off);
}
}
int getCurrentStackTrace(size_t skip, StackTrace* trace) {
trace->frameIPs = NULL;
trace->frameCount = 0;
struct Context ctx;
ctx.trace = trace;
ctx.skip = skip;
ctx.capacity = 0;
unw_context_t uctx;
int r = unw_getcontext(&uctx);
int err = checkError("unw_get_context", r);
if (err) return err;
unw_cursor_t cursor;
r = unw_init_local(&cursor, &uctx);
err = checkError("unw_init_local", r);
if (err) return err;
while ((r = unw_step(&cursor)) > 0) {
if ((err = addIP(&ctx, &cursor)) != 0) {
destroyStackTrace(trace);
return err;
}
}
err = checkError("unw_step", r);
if (err) return err;
return 0;
}
static void handler(int sig) {
unw_context_t context;
unw_getcontext(&context);
unw_cursor_t cursor;
unw_init_local(&cursor, &context);
SkDebugf("\nSignal %d:\n", sig);
while (unw_step(&cursor) > 0) {
static const size_t kMax = 256;
char mangled[kMax], demangled[kMax];
unw_word_t offset;
unw_get_proc_name(&cursor, mangled, kMax, &offset);
int ok;
size_t len = kMax;
abi::__cxa_demangle(mangled, demangled, &len, &ok);
SkDebugf("%s (+0x%zx)\n", ok == 0 ? demangled : mangled, (size_t)offset);
}
SkDebugf("\n");
// Exit NOW. Don't notify other threads, don't call anything registered with atexit().
_Exit(sig);
}
static int vmprof_unw_step(unw_cursor_t *cp, int first_run) {
void* ip;
void* sp;
ptrdiff_t sp_offset;
unw_get_reg (cp, UNW_REG_IP, (unw_word_t*)&ip);
unw_get_reg (cp, UNW_REG_SP, (unw_word_t*)&sp);
if (!first_run)
// make sure we're pointing to the CALL and not to the first
// instruction after. If the callee adjusts the stack for us
// it's not safe to be at the instruction after
ip -= 1;
sp_offset = vmprof_unw_get_custom_offset(ip, cp);
if (sp_offset == -1) {
// it means that the ip is NOT in JITted code, so we can use the
// stardard unw_step
return unw_step(cp);
}
else {
// this is a horrible hack to manually walk the stack frame, by
// setting the IP and SP in the cursor
vmprof_hacked_unw_cursor_t *cp2 = (vmprof_hacked_unw_cursor_t*)cp;
void* bp = (void*)sp + sp_offset;
cp2->sp = bp;
bp -= sizeof(void*);
cp2->ip = ((void**)bp)[0];
// the ret is on the top of the stack minus WORD
return 1;
}
}
UINT64 Extrae_get_caller (int offset)
{
int current_deep = 0;
unw_cursor_t cursor;
unw_context_t uc;
unw_word_t ip;
if (unw_getcontext(&uc) < 0)
return 0;
if (unw_init_local(&cursor, &uc))
return 0;
offset --; /* Don't compute call to unw_getcontext */
while (current_deep <= offset)
{
if (unw_get_reg(&cursor, UNW_REG_IP, &ip) < 0)
break;
#if defined(DEBUG)
fprintf (stderr, "DEBUG: offset %d depth %d address %08llx %c\n", offset, current_deep, ip, (offset == current_deep)?'*':' ');
#endif
if (unw_step (&cursor) <= 0)
return 0;
current_deep ++;
}
return (UINT64) ip;
}
static void _adjust_stack_pre_safepoint(hlt_execution_context* ctx)
{
// Climb up the stack and adjust the reference counts for live objects
// referenced there so that it reflects reality.
unw_cursor_t cursor;
unw_context_t uc;
unw_word_t ip, sp;
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
int level = 0;
while ( unw_step(&cursor) > 0 ) {
unw_get_reg(&cursor, UNW_REG_IP, &ip);
unw_get_reg(&cursor, UNW_REG_SP, &sp);
printf("level = %d ip = %lx, sp = %lx\n", level, (long)ip, (long)sp);
level++;
}
#ifdef DEBUG
// DBG_LOG("hilti-mem", "%10s stack-adjust-ctor %p %d %s::%s = %s", obj, level, func, id, render);
#endif
}
void VSDebugLib::printStack() {
unw_cursor_t cursor;
unw_context_t uc;
unw_word_t ip, sp, off;
unw_proc_info_t pi;
char file[256], name[256];
int line;
int status;
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
while (unw_step(&cursor) > 0) {
unw_get_reg(&cursor, UNW_REG_IP, &ip);
unw_get_reg(&cursor, UNW_REG_SP, &sp);
unw_get_proc_name (&cursor, name, sizeof (name), &off);
getFileAndLine((long)ip, file, 256, &line);
if (line >= 0) {
char *realname;
realname = abi::__cxa_demangle(name, 0, 0, &status);
if (realname) {
printf("%s: %s, %d\n", realname, file, line);
free(realname);
} else {
printf("%s: %s, %d\n", name, file, line);
}
}
}
}
static ALWAYS_INLINE int
slow_backtrace (void **buffer, int size, unw_context_t *uc, int skip)
{
unw_cursor_t cursor;
unw_word_t ip;
int n = 0;
if (unlikely (unw_init_local (&cursor, uc) < 0))
return 0;
while (unw_step (&cursor) > 0)
{
if (n >= size)
return n;
if (unw_get_reg (&cursor, UNW_REG_IP, &ip) < 0)
return n;
if (skip > 0)
skip--;
else
buffer[n++] = (void *) (uintptr_t) ip;
}
return n;
}
int dwarf_backtrace(CallStack **returnStack) {
*returnStack = calloc(1, sizeof(CallStack));
CallStack *callStack = *returnStack;
callStack->stack = calloc(INITIAL_LIVE_FUNCTION_SIZE, sizeof(LiveFunction));
callStack->count = 0;
callStack->capacity = INITIAL_LIVE_FUNCTION_SIZE;
unw_cursor_t cursor;
unw_context_t uc;
unw_word_t ip, sp;
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
while (unw_step(&cursor) > 0) {
unw_get_reg(&cursor, UNW_REG_IP, &ip);
unw_get_reg(&cursor, UNW_REG_SP, &sp);
if (callStack->count >= callStack->capacity) {
callStack->capacity *= 2;
callStack->stack = realloc(callStack->stack,
callStack->capacity * sizeof(LiveFunction *));
}
callStack->stack[callStack->count].cursor = cursor;
callStack->stack[callStack->count].pc = (void *)ip;
callStack->stack[callStack->count].sp = (void *)sp;
printf("%p => %p\n", (void *)ip, (void *)sp);
callStack->count++;
}
return callStack->count;
}
void fakegc()
{
std::cout << "GC\n";
unw_cursor_t cursor;
unw_word_t ip, sp;
unw_context_t uc;
root_info_t root_info_ptr;
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
do
{
unw_get_reg(&cursor, UNW_REG_IP, &ip);
unw_get_reg(&cursor, UNW_REG_SP, &sp);
// printf("ip=%p sp=%p\n", ip, sp);
if (stk_map.find_root_info((void*)ip, root_info_ptr))
{
for(auto it : root_info_ptr)
{
int *cptr = *((int**)sp - it);
printf("x=%p\n", cptr);
printf("i=%d\n", *cptr);
*cptr = *cptr + 1;
}
}
} while (unw_step(&cursor) > 0);
}
void _dump_crash_report(unsigne pid)
// shortened code from android's debuggerd
// to get a backtrace on ARM
{
unw_addr_space_t as;
struct UPT_info *ui;
unw_cursor_t cursor;
as = unw_create_addr_space(&_UPT_accessors, 0);
ui = _UPT_create(pid);
int ret = unw_init_remote(&cursor, as, ui);
if (ret < 0) {
PRINTF("WARNING: unw_init_remote() failed [pid %i]\n", pid);
_UPT_destroy(ui);
return;
}
PRINTF("DEBUG: backtrace of the remote process (pid %d) using libunwind-ptrace:\n", pid);
do {
unw_word_t ip, sp, offp;
char buf[512];
unw_get_reg(&cursor, UNW_REG_IP, &ip);
unw_get_reg(&cursor, UNW_REG_SP, &sp);
unw_get_proc_name(&cursor, buf, sizeof (buf), &offp);
PRINTF("DEBUG: ip: %10p, sp: %10p %s\n", (void*) ip, (void*) sp, buf);
} while ((ret = unw_step (&cursor)) > 0);
_UPT_destroy (ui);
}
static void findRealErrorOnStack (ShockerScriptableControlObject* obj) {
unw_context_t uc;
unw_cursor_t cursor, prev;
unw_word_t bp;
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
char framename [1024];
int count = 0;
while (unw_step(&cursor) > 0 && count < 18) {
count++;
unw_get_proc_name (&cursor, framename, sizeof(framename), 0);
if (!*framename)
continue;
if (strstr (framename, "js_ReportErrorAgain")) {
#if (__i386__)
unw_get_reg(&prev, UNW_X86_EBP, &bp);
#elif (__amd64__)
unw_get_reg(&prev, UNW_X86_64_RBP, &bp);
#endif
bp += 12;
char ** n = (char**)bp;
obj->GetLogProvider ()->LogError (*n);
break;
}
prev = cursor;
}
}
void collectStackRoots(TraceStack *stack) {
unw_cursor_t cursor;
unw_context_t uc;
unw_word_t ip, sp, bp;
// force callee-save registers onto the stack:
// Actually, I feel like this is pretty brittle:
// collectStackRoots itself is allowed to save the callee-save registers
// on its own stack.
jmp_buf registers __attribute__((aligned(sizeof(void*))));
#ifdef VALGRIND
memset(®isters, 0, sizeof(registers));
memset(&cursor, 0, sizeof(cursor));
memset(&uc, 0, sizeof(uc));
memset(&ip, 0, sizeof(ip));
memset(&sp, 0, sizeof(sp));
memset(&bp, 0, sizeof(bp));
#endif
setjmp(registers);
assert(sizeof(registers) % 8 == 0);
//void* stack_bottom = __builtin_frame_address(0);
collectRoots(®isters, ®isters + 1, stack);
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
TraceStackGCVisitor visitor(stack);
int code;
while (true) {
int code = unw_step(&cursor);
assert(code > 0 && "something broke unwinding!");
unw_get_reg(&cursor, UNW_REG_IP, &ip);
unw_get_reg(&cursor, UNW_REG_SP, &sp);
unw_get_reg(&cursor, UNW_TDEP_BP, &bp);
void* cur_sp = (void*)sp;
void* cur_bp = (void*)bp;
//std::string name = g.func_addr_registry.getFuncNameAtAddress((void*)ip, true);
//if (VERBOSITY()) printf("ip = %lx (%s), stack = [%p, %p)\n", (long) ip, name.c_str(), cur_sp, cur_bp);
unw_proc_info_t pip;
unw_get_proc_info(&cursor, &pip);
if (pip.start_ip == (uintptr_t)&__libc_start_main) {
break;
}
if (pip.start_ip == (intptr_t)interpretFunction) {
// TODO Do we still need to crawl the interpreter itself?
gatherInterpreterRootsForFrame(&visitor, cur_bp);
}
collectRoots(cur_sp, (char*)cur_bp, stack);
}
}
static void
throw_exception (MonoObject *exc, guint64 rethrow)
{
unw_context_t unw_ctx;
MonoContext ctx;
MonoJitInfo *ji;
unw_word_t ip, sp;
int res;
if (mono_object_isinst (exc, mono_defaults.exception_class)) {
MonoException *mono_ex = (MonoException*)exc;
if (!rethrow) {
mono_ex->stack_trace = NULL;
mono_ex->trace_ips = NULL;
}
}
res = unw_getcontext (&unw_ctx);
g_assert (res == 0);
res = unw_init_local (&ctx.cursor, &unw_ctx);
g_assert (res == 0);
/*
* Unwind until the first managed frame. This is needed since
* mono_handle_exception expects the variables in the original context to
* correspond to the method returned by mono_find_jit_info.
*/
while (TRUE) {
res = unw_get_reg (&ctx.cursor, UNW_IA64_IP, &ip);
g_assert (res == 0);
res = unw_get_reg (&ctx.cursor, UNW_IA64_SP, &sp);
g_assert (res == 0);
ji = mini_jit_info_table_find (mono_domain_get (), (gpointer)ip, NULL);
//printf ("UN: %s %lx %lx\n", ji ? jinfo_get_method (ji)->name : "", ip, sp);
if (ji)
break;
res = unw_step (&ctx.cursor);
if (res == 0) {
/*
* This means an unhandled exception during the compilation of a
* topmost method like Main
*/
break;
}
g_assert (res >= 0);
}
ctx.precise_ip = FALSE;
mono_handle_exception (&ctx, exc);
restore_context (&ctx);
g_assert_not_reached ();
}
__SHIM__CALLER __SHIM__get_caller()
{
unw_cursor_t cursor;
unw_word_t sp;
unw_word_t ip;
unw_context_t uc;
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
if((unw_step(&cursor) > 0) && (unw_step(&cursor) > 0)) {
unw_get_reg(&cursor, UNW_REG_IP, &ip);
return ip - CALLER0;
} else {
perror("caller");
exit(1);
}
}
bool UnwindCurrent::UnwindFromContext(size_t num_ignore_frames, bool resolve) {
// The cursor structure is pretty large, do not put it on the stack.
unw_cursor_t* cursor = new unw_cursor_t;
int ret = unw_init_local(cursor, &context_);
if (ret < 0) {
BACK_LOGW("unw_init_local failed %d", ret);
delete cursor;
return false;
}
std::vector<backtrace_frame_data_t>* frames = GetFrames();
frames->reserve(MAX_BACKTRACE_FRAMES);
size_t num_frames = 0;
do {
unw_word_t pc;
ret = unw_get_reg(cursor, UNW_REG_IP, &pc);
if (ret < 0) {
BACK_LOGW("Failed to read IP %d", ret);
break;
}
unw_word_t sp;
ret = unw_get_reg(cursor, UNW_REG_SP, &sp);
if (ret < 0) {
BACK_LOGW("Failed to read SP %d", ret);
break;
}
if (num_ignore_frames == 0) {
frames->resize(num_frames+1);
backtrace_frame_data_t* frame = &frames->at(num_frames);
frame->num = num_frames;
frame->pc = static_cast<uintptr_t>(pc);
frame->sp = static_cast<uintptr_t>(sp);
frame->stack_size = 0;
if (num_frames > 0) {
// Set the stack size for the previous frame.
backtrace_frame_data_t* prev = &frames->at(num_frames-1);
prev->stack_size = frame->sp - prev->sp;
}
if (resolve) {
frame->func_name = GetFunctionName(frame->pc, &frame->func_offset);
frame->map = FindMap(frame->pc);
} else {
frame->map = NULL;
frame->func_offset = 0;
}
num_frames++;
} else {
num_ignore_frames--;
}
ret = unw_step (cursor);
} while (ret > 0 && num_frames < MAX_BACKTRACE_FRAMES);
delete cursor;
return true;
}
static void luw_backtrace()
{
unw_cursor_t cursor;
unw_context_t context;
unw_getcontext(&context);
unw_init_local(&cursor, &context);
std::stringstream output;
output << "Traceback (most recent call first):" << std::endl;
while (unw_step(&cursor) > 0)
{
unw_word_t pc;
unw_get_reg(&cursor, UNW_REG_IP, &pc);
if (pc == 0)
break;
const char *file = NULL;
const char *func = NULL;
unsigned line = 0;
resolve(pc, &file, &line, &func);
if (file != NULL)
{
if (strcmp("__cxa_throw", func) == 0) continue;
if (strncmp(func, "_Z", 2) == 0)
{
// This is a C++ mangled name (as per the IA-64 spec)
output << " 0x" << std::hex << pc << std::dec << " " << demangle(func) << " (" << file << ":" << line << ")" << std::endl;
} else {
output << " 0x" << std::hex << pc << std::dec << " " << func << " (" << file << ":" << line << ")" << std::endl;
}
// Try to load the file and print the offending line
std::ifstream f;
f.open(file);
if (!f.is_open())
{
output << " <unable to find file>" << std::endl;
} else
{
seek_to_line(f, line);
std::string line;
std::getline(f, line);
output << " " << line << std::endl;
}
} else {
output << " <unknown> (<unknown file>:<unknown line>)" << std::endl;
}
}
output << std::endl;
__latest_backtrace = output.str();
}
void
jffi_longjmp (jmp_buf env, int val)
{
extern int _jffi_longjmp_cont;
unw_context_t uc;
unw_cursor_t c;
unw_word_t sp, ip, bp = 0;
uintptr_t *wp = (uintptr_t *) env;
int i, setjmp_frame;
if (unw_getcontext (&uc) < 0 || unw_init_local (&c, &uc) < 0) {
debug("failed to get context");
abort ();
}
#ifdef __x86_86__
# define UNW_REG_BP UNW_X86_64_RBP
#else
# define UNW_REG_BP UNW_X86_EBP
#endif
setjmp_frame = 0;
do {
char name[256];
unw_proc_info_t pi;
unw_word_t off;
if (unw_get_reg (&c, UNW_REG_BP, &bp) < 0) {
abort();
}
if (unw_get_reg (&c, UNW_REG_SP, &sp) < 0) {
abort();
}
if (unw_get_reg (&c, UNW_REG_IP, &ip) < 0) {
abort();
}
unw_get_proc_name(&c, name, sizeof(name), &off);
unw_get_proc_info(&c, &pi);
// debug("frame %s ip=%llx sp=%llx bp=%llx wp[RP]=%p wp[SP]=%p, pi.start_ip=%llx, pi.end_ip=%llx",
// name, (long long) ip, (long long) sp, (long long) bp, (void *) wp[JB_RP], (void *) wp[JB_SP],
// pi.start_ip, pi.end_ip);
if (wp[JB_SP] > sp || wp[JB_RP] < pi.start_ip || wp[JB_RP] > pi.end_ip) continue;
/* found the right frame: */
// debug("found frame to jump back to");
assert (UNW_NUM_EH_REGS >= 2);
if (unw_set_reg (&c, UNW_REG_EH + 0, wp[JB_RP]) < 0
|| unw_set_reg (&c, UNW_REG_EH + 1, val) < 0
|| unw_set_reg (&c, UNW_REG_IP, (unw_word_t) (uintptr_t) &_jffi_longjmp_cont))
abort ();
unw_resume (&c);
// should not reach here
abort ();
} while (unw_step (&c) > 0);
// debug("failed to find correct frame to jmp to");
}
bool BacktraceOffline::Unwind(size_t num_ignore_frames, ucontext_t* context) {
if (context == nullptr) {
BACK_LOGW("The context is needed for offline backtracing.");
return false;
}
context_ = context;
unw_addr_space_t addr_space = unw_create_addr_space(&accessors, 0);
unw_cursor_t cursor;
int ret = unw_init_remote(&cursor, addr_space, this);
if (ret != 0) {
BACK_LOGW("unw_init_remote failed %d", ret);
unw_destroy_addr_space(addr_space);
return false;
}
size_t num_frames = 0;
do {
unw_word_t pc;
ret = unw_get_reg(&cursor, UNW_REG_IP, &pc);
if (ret < 0) {
BACK_LOGW("Failed to read IP %d", ret);
break;
}
unw_word_t sp;
ret = unw_get_reg(&cursor, UNW_REG_SP, &sp);
if (ret < 0) {
BACK_LOGW("Failed to read SP %d", ret);
break;
}
if (num_ignore_frames == 0) {
frames_.resize(num_frames + 1);
backtrace_frame_data_t* frame = &frames_[num_frames];
frame->num = num_frames;
frame->pc = static_cast<uintptr_t>(pc);
frame->sp = static_cast<uintptr_t>(sp);
frame->stack_size = 0;
if (num_frames > 0) {
backtrace_frame_data_t* prev = &frames_[num_frames - 1];
prev->stack_size = frame->sp - prev->sp;
}
frame->func_name = GetFunctionName(frame->pc, &frame->func_offset);
FillInMap(frame->pc, &frame->map);
num_frames++;
} else {
num_ignore_frames--;
}
ret = unw_step(&cursor);
} while (ret > 0 && num_frames < MAX_BACKTRACE_FRAMES);
unw_destroy_addr_space(addr_space);
context_ = nullptr;
return true;
}
void log_stack_trace(const char *msg)
{
#ifdef USE_UNWIND
unw_context_t ctx;
unw_cursor_t cur;
unw_word_t ip, off;
unsigned level;
char sym[512], *dsym;
int status;
const char *log = stack_trace_log.empty() ? NULL : stack_trace_log.c_str();
#endif
if (msg)
ST_LOG(msg);
ST_LOG("Unwound call stack:");
#ifdef USE_UNWIND
if (unw_getcontext(&ctx) < 0) {
ST_LOG("Failed to create unwind context");
return;
}
if (unw_init_local(&cur, &ctx) < 0) {
ST_LOG("Failed to find the first unwind frame");
return;
}
for (level = 1; level < 999; ++level) { // 999 for safety
int ret = unw_step(&cur);
if (ret < 0) {
ST_LOG("Failed to find the next frame");
return;
}
if (ret == 0)
break;
if (unw_get_reg(&cur, UNW_REG_IP, &ip) < 0) {
ST_LOG(" " << std::setw(4) << level);
continue;
}
if (unw_get_proc_name(&cur, sym, sizeof(sym), &off) < 0) {
ST_LOG(" " << std::setw(4) << level << std::setbase(16) << std::setw(20) << "0x" << ip);
continue;
}
dsym = abi::__cxa_demangle(sym, NULL, NULL, &status);
ST_LOG(" " << std::setw(4) << level << std::setbase(16) << std::setw(20) << "0x" << ip << " " << (!status && dsym ? dsym : sym) << " + " << "0x" << off);
free(dsym);
}
#else
std::stringstream ss;
ss << el::base::debug::StackTrace();
std::vector<std::string> lines;
std::string s = ss.str();
boost::split(lines, s, boost::is_any_of("\n"));
for (const auto &line: lines)
ST_LOG(line);
#endif
}
static int jl_unw_step(bt_cursor_t *cursor, uintptr_t *ip, uintptr_t *sp)
{
unw_word_t reg;
if (unw_get_reg(cursor, UNW_REG_IP, ®) < 0)
return 0;
*ip = reg;
if (unw_get_reg(cursor, UNW_REG_SP, ®) < 0)
return 0;
*sp = reg;
return unw_step(cursor) > 0;
}
static void
sighandler (int signal)
{
unw_cursor_t cursor, cursor2;
unw_word_t ip;
unw_context_t uc;
if (verbose)
printf ("caught signal %d\n", signal);
unw_getcontext (&uc);
if (unw_init_local (&cursor, &uc) < 0)
panic ("unw_init() failed!\n");
/* get cursor for caller of sighandler: */
if (unw_step (&cursor) < 0)
panic ("unw_step() failed!\n");
cursor2 = cursor;
while (!unw_is_signal_frame (&cursor2))
if (unw_step (&cursor2) < 0)
panic ("failed to find signal frame!\n");
if (unw_step (&cursor2) < 0)
panic ("unw_step() failed!\n");
if (unw_get_reg (&cursor2, UNW_REG_IP, &ip) < 0)
panic ("failed to get IP!\n");
/* skip faulting instruction (doesn't handle MLX template) */
++ip;
if ((ip & 0x3) == 0x3)
ip += 13;
if (unw_set_reg (&cursor2, UNW_REG_IP, ip) < 0)
panic ("failed to set IP!\n");
unw_resume (&cursor); /* update context & return to caller of sighandler() */
panic ("unexpected return from unw_resume()!\n");
}