Revision 6e23543bc477eb46e5fc8d5cab119190b990ed7c authored by Keno Fischer on 24 November 2023, 15:26:51 UTC, committed by GitHub on 24 November 2023, 15:26:51 UTC
This is cherry-picked from #52245. This is an independent bugfix, and looks like #52245 might need another round of discussion. There were two separate off-by-1's in the codegen code that is trying to detect assignments to slots inside try/catch regions. First, it was asking to include the value of the catch label, which is actually the first statement *not* in the try region. Second, there was a confusion of 0 and 1 based indexing in the iteration bounds. The end result of this was that the code was also looking at the first two statements of the catch region. This wasn't a problem before #52245 (other than a potentially over-conservative marking of some slots as volatile), because our catch blocks always had at least two statements (a :leave and a terminator), but with the `:leave` change, it is possible to have catch blocks with only one statement. If these happened to be at the end of the function, things would blow up. As a side node, this code isn't particularly sound, because it assumes that try/catch regions are lexical, which they are not. The assumption happens to work out ok for the code we generate in the frontend and optimized IR doesn't have slots, so we don't use this code, but it is not in general sound.
1 parent a386cd1
stackwalk.c
// This file is a part of Julia. License is MIT: https://julialang.org/license
/*
stackwalk.c
utilities for walking the stack and looking up information about code addresses
*/
#include <inttypes.h>
#include "julia.h"
#include "julia_internal.h"
#include "threading.h"
#include "julia_assert.h"
// define `jl_unw_get` as a macro, since (like setjmp)
// returning from the callee function will invalidate the context
#ifdef _OS_WINDOWS_
uv_mutex_t jl_in_stackwalk;
#define jl_unw_get(context) (RtlCaptureContext(context), 0)
#elif !defined(JL_DISABLE_LIBUNWIND)
#define jl_unw_get(context) unw_getcontext(context)
#else
int jl_unw_get(void *context) { return -1; }
#endif
#ifdef __cplusplus
extern "C" {
#endif
static int jl_unw_init(bt_cursor_t *cursor, bt_context_t *context) JL_NOTSAFEPOINT;
static int jl_unw_step(bt_cursor_t *cursor, int from_signal_handler, uintptr_t *ip, uintptr_t *sp) JL_NOTSAFEPOINT;
static jl_gcframe_t *is_enter_interpreter_frame(jl_gcframe_t **ppgcstack, uintptr_t sp) JL_NOTSAFEPOINT
{
jl_gcframe_t *pgcstack = *ppgcstack;
while (pgcstack != NULL) {
jl_gcframe_t *prev = pgcstack->prev;
if (pgcstack->nroots & 2) { // tagged frame
uintptr_t frame_fp = ((uintptr_t*)pgcstack)[-1];
if (frame_fp != 0) { // check that frame was fully initialized
if (frame_fp >= sp)
break; // stack grows down, so frame pointer is monotonically increasing
*ppgcstack = prev;
return pgcstack;
}
}
*ppgcstack = pgcstack = prev;
}
return NULL;
}
// Record backtrace entries into bt_data by stepping cursor with jl_unw_step
// until the outermost frame is encountered or the buffer bt_data is (close to)
// full. Returned instruction pointers are adjusted to point to the address of
// the call instruction. The first `skip` frames are not included in `bt_data`.
//
// `maxsize` is the size of the buffer `bt_data` (and `sp` if non-NULL). It
// must be at least `JL_BT_MAX_ENTRY_SIZE + 1` to accommodate extended backtrace
// entries. If `sp != NULL`, the stack pointer corresponding `bt_data[i]` is
// stored in `sp[i]`.
//
// `*ppgcstack` should be given if you want to record extended backtrace
// entries in `bt_data` for each julia interpreter frame.
//
// Flag `from_signal_handler==1` should be set if the cursor was obtained by
// asynchronously interrupting the code.
//
// jl_unw_stepn will return 1 if there are more frames to come. The number of
// elements written to bt_data (and sp if non-NULL) are returned in bt_size.
static int jl_unw_stepn(bt_cursor_t *cursor, jl_bt_element_t *bt_data, size_t *bt_size,
uintptr_t *sp, size_t maxsize, int skip, jl_gcframe_t **ppgcstack,
int from_signal_handler) JL_NOTSAFEPOINT
{
volatile size_t n = 0;
volatile int need_more_space = 0;
uintptr_t return_ip = 0;
uintptr_t thesp = 0;
#if defined(_OS_WINDOWS_) && !defined(_CPU_X86_64_)
uv_mutex_lock(&jl_in_stackwalk);
if (!from_signal_handler) {
// Workaround 32-bit windows bug missing top frame
// See for example https://bugs.chromium.org/p/crashpad/issues/detail?id=53
skip--;
}
#endif
#if !defined(_OS_WINDOWS_)
jl_jmp_buf *old_buf = jl_get_safe_restore();
jl_jmp_buf buf;
jl_set_safe_restore(&buf);
if (!jl_setjmp(buf, 0)) {
#endif
int have_more_frames = 1;
while (have_more_frames) {
if (n + JL_BT_MAX_ENTRY_SIZE + 1 > maxsize) {
// Postpone advancing the cursor: may need more space
need_more_space = 1;
break;
}
uintptr_t oldsp = thesp;
have_more_frames = jl_unw_step(cursor, from_signal_handler, &return_ip, &thesp);
if (oldsp >= thesp && !jl_running_under_rr(0)) {
// The stack pointer is clearly bad, as it must grow downwards.
// But sometimes the external unwinder doesn't check that.
have_more_frames = 0;
}
if (return_ip == 0) {
// The return address is clearly wrong, and while the unwinder
// might try to continue (by popping another stack frame), that
// likely won't work well, and it'll confuse the stack frame
// separator detection logic (double-NULL).
have_more_frames = 0;
}
if (skip > 0) {
skip--;
from_signal_handler = 0;
continue;
}
// For the purposes of looking up debug info for functions, we want
// to harvest addresses for the *call* instruction `call_ip` during
// stack walking. However, this information isn't directly
// available. Instead, the stack walk discovers the address
// `return_ip` which would be *returned to* as the stack is
// unwound.
//
// To infer `call_ip` in full generality we need to understand each
// platform ABI instruction pointer encoding and calling
// conventions, noting that the latter may vary per stack frame.
//
// See also:
// * The LLVM unwinder functions step() and setInfoBasedOnIPRegister()
// https://github.com/llvm/llvm-project/blob/master/libunwind/src/UnwindCursor.hpp
// * The way that libunwind handles it in `unw_get_proc_name`:
// https://lists.nongnu.org/archive/html/libunwind-devel/2014-06/msg00025.html
uintptr_t call_ip = return_ip;
// ARM instruction pointer encoding uses the low bit as a flag for
// thumb mode, which must be cleared before further use. (Note not
// needed for ARM AArch64.) See
// https://github.com/libunwind/libunwind/pull/131
#ifdef _CPU_ARM_
call_ip &= ~(uintptr_t)0x1;
#endif
// Now there's two main cases to adjust for:
// * Normal stack frames where compilers emit a `call` instruction
// which we can get from the return address via `call_ip = return_ip - 1`.
// * Code which was interrupted asynchronously (eg, via a signal)
// is expected to have `call_ip == return_ip`.
if (!from_signal_handler)
call_ip -= 1; // normal frame
from_signal_handler = 0;
if (call_ip == JL_BT_NON_PTR_ENTRY || call_ip == 0) {
// Never leave special marker in the bt data as it can corrupt the GC.
have_more_frames = 0;
call_ip = 0;
}
jl_bt_element_t *bt_entry = bt_data + n;
jl_gcframe_t *pgcstack;
if ((pgcstack = is_enter_interpreter_frame(ppgcstack, thesp))) {
size_t add = jl_capture_interp_frame(bt_entry, (void*)((char*)pgcstack - sizeof(void*)), maxsize - n);
n += add;
bt_entry += add;
while ((pgcstack = is_enter_interpreter_frame(ppgcstack, thesp))) {
// If the compiler got inlining-happy, or the user tried to
// push multiple frames (or the unwinder got very
// confused), we could end up here. That doesn't happen
// now, so just ignore this possibility. If we want this,
// we can work on adding support for it later.
}
}
bt_entry->uintptr = call_ip;
if (sp)
sp[n] = thesp;
n++;
}
// NOTE: if we have some pgcstack entries remaining (because the
// unwinder failed and returned !have_more_frames early), we could
// consider still appending those frames here
#if !defined(_OS_WINDOWS_)
}
else {
// The unwinding fails likely because a invalid memory read.
// Back off one frame since it is likely invalid.
// This seems to be good enough on x86 to make the LLVM debug info
// reader happy.
if (n > 0) n -= 1;
}
jl_set_safe_restore(old_buf);
#endif
#if defined(_OS_WINDOWS_) && !defined(_CPU_X86_64_)
uv_mutex_unlock(&jl_in_stackwalk);
#endif
*bt_size = n;
return need_more_space;
}
NOINLINE size_t rec_backtrace_ctx(jl_bt_element_t *bt_data, size_t maxsize,
bt_context_t *context, jl_gcframe_t *pgcstack) JL_NOTSAFEPOINT
{
bt_cursor_t cursor;
if (!jl_unw_init(&cursor, context))
return 0;
size_t bt_size = 0;
jl_unw_stepn(&cursor, bt_data, &bt_size, NULL, maxsize, 0, &pgcstack, 1);
return bt_size;
}
// Record backtrace into buffer `bt_data`, using a maximum of `maxsize`
// elements, and returning the number of elements written.
//
// The first `skip` frames are omitted, in addition to omitting the frame from
// `rec_backtrace` itself.
NOINLINE size_t rec_backtrace(jl_bt_element_t *bt_data, size_t maxsize, int skip)
{
bt_context_t context;
memset(&context, 0, sizeof(context));
int r = jl_unw_get(&context);
if (r < 0)
return 0;
bt_cursor_t cursor;
if (!jl_unw_init(&cursor, &context) || maxsize == 0)
return 0;
jl_gcframe_t *pgcstack = jl_pgcstack;
size_t bt_size = 0;
jl_unw_stepn(&cursor, bt_data, &bt_size, NULL, maxsize, skip + 1, &pgcstack, 0);
return bt_size;
}
static jl_value_t *array_ptr_void_type JL_ALWAYS_LEAFTYPE = NULL;
// Return backtrace information as an svec of (bt1, bt2, [sp])
//
// The stack pointers `sp` are returned only when `returnsp` evaluates to true.
// bt1 contains raw backtrace entries, while bt2 exists to root any julia
// objects associated with the entries in bt1.
//
// The frame from jl_backtrace_from_here will be skipped; set `skip > 0` to
// skip additional native frames from the start of the backtrace.
JL_DLLEXPORT jl_value_t *jl_backtrace_from_here(int returnsp, int skip)
{
jl_array_t *ip = NULL;
jl_array_t *sp = NULL;
jl_array_t *bt2 = NULL;
JL_GC_PUSH3(&ip, &sp, &bt2);
if (array_ptr_void_type == NULL) {
array_ptr_void_type = jl_apply_type2((jl_value_t*)jl_array_type, (jl_value_t*)jl_voidpointer_type, jl_box_long(1));
}
ip = jl_alloc_array_1d(array_ptr_void_type, 0);
sp = returnsp ? jl_alloc_array_1d(array_ptr_void_type, 0) : NULL;
bt2 = jl_alloc_array_1d(jl_array_any_type, 0);
const size_t maxincr = 1000;
bt_context_t context;
bt_cursor_t cursor;
memset(&context, 0, sizeof(context));
int r = jl_unw_get(&context);
jl_gcframe_t *pgcstack = jl_pgcstack;
if (r == 0 && jl_unw_init(&cursor, &context)) {
// Skip frame for jl_backtrace_from_here itself
skip += 1;
size_t offset = 0;
int have_more_frames = 1;
while (have_more_frames) {
jl_array_grow_end(ip, maxincr);
uintptr_t *sp_ptr = NULL;
if (returnsp) {
jl_array_grow_end(sp, maxincr);
sp_ptr = jl_array_data(sp, uintptr_t) + offset;
}
size_t size_incr = 0;
have_more_frames = jl_unw_stepn(&cursor, jl_array_data(ip, jl_bt_element_t) + offset,
&size_incr, sp_ptr, maxincr, skip, &pgcstack, 0);
skip = 0;
offset += size_incr;
}
jl_array_del_end(ip, jl_array_nrows(ip) - offset);
if (returnsp)
jl_array_del_end(sp, jl_array_nrows(sp) - offset);
size_t n = 0;
jl_bt_element_t *bt_data = jl_array_data(ip, jl_bt_element_t);
while (n < jl_array_nrows(ip)) {
jl_bt_element_t *bt_entry = bt_data + n;
if (!jl_bt_is_native(bt_entry)) {
size_t njlvals = jl_bt_num_jlvals(bt_entry);
for (size_t j = 0; j < njlvals; j++) {
jl_value_t *v = jl_bt_entry_jlvalue(bt_entry, j);
JL_GC_PROMISE_ROOTED(v);
jl_array_ptr_1d_push(bt2, v);
}
}
n += jl_bt_entry_size(bt_entry);
}
}
jl_value_t *bt = returnsp ? (jl_value_t*)jl_svec(3, ip, bt2, sp) : (jl_value_t*)jl_svec(2, ip, bt2);
JL_GC_POP();
return bt;
}
static void decode_backtrace(jl_bt_element_t *bt_data, size_t bt_size,
jl_array_t **btout JL_REQUIRE_ROOTED_SLOT,
jl_array_t **bt2out JL_REQUIRE_ROOTED_SLOT)
{
jl_array_t *bt, *bt2;
if (array_ptr_void_type == NULL) {
array_ptr_void_type = jl_apply_type2((jl_value_t*)jl_array_type, (jl_value_t*)jl_voidpointer_type, jl_box_long(1));
}
bt = *btout = jl_alloc_array_1d(array_ptr_void_type, bt_size);
static_assert(sizeof(jl_bt_element_t) == sizeof(void*),
"jl_bt_element_t is presented as Ptr{Cvoid} on julia side");
memcpy(jl_array_data(bt, jl_bt_element_t), bt_data, bt_size * sizeof(jl_bt_element_t));
bt2 = *bt2out = jl_alloc_array_1d(jl_array_any_type, 0);
// Scan the backtrace buffer for any gc-managed values
for (size_t i = 0; i < bt_size; i += jl_bt_entry_size(bt_data + i)) {
jl_bt_element_t* bt_entry = bt_data + i;
if (jl_bt_is_native(bt_entry))
continue;
size_t njlvals = jl_bt_num_jlvals(bt_entry);
for (size_t j = 0; j < njlvals; j++) {
jl_value_t *v = jl_bt_entry_jlvalue(bt_entry, j);
JL_GC_PROMISE_ROOTED(v);
jl_array_ptr_1d_push(bt2, v);
}
}
}
JL_DLLEXPORT jl_value_t *jl_get_backtrace(void)
{
JL_TIMING(STACKWALK, STACKWALK_Backtrace);
jl_excstack_t *s = jl_current_task->excstack;
jl_bt_element_t *bt_data = NULL;
size_t bt_size = 0;
if (s && s->top) {
bt_data = jl_excstack_bt_data(s, s->top);
bt_size = jl_excstack_bt_size(s, s->top);
}
jl_array_t *bt = NULL, *bt2 = NULL;
JL_GC_PUSH2(&bt, &bt2);
decode_backtrace(bt_data, bt_size, &bt, &bt2);
jl_svec_t *pair = jl_svec2(bt, bt2);
JL_GC_POP();
return (jl_value_t*)pair;
}
// Return data from the exception stack for `task` as an array of Any, starting
// with the top of the stack and returning up to `max_entries`. If requested by
// setting the `include_bt` flag, backtrace data in bt,bt2 format is
// interleaved.
JL_DLLEXPORT jl_value_t *jl_get_excstack(jl_task_t* task, int include_bt, int max_entries)
{
JL_TYPECHK(current_exceptions, task, (jl_value_t*)task);
JL_TIMING(STACKWALK, STACKWALK_Excstack);
jl_task_t *ct = jl_current_task;
if (task != ct && jl_atomic_load_relaxed(&task->_state) == JL_TASK_STATE_RUNNABLE) {
jl_error("Inspecting the exception stack of a task which might "
"be running concurrently isn't allowed.");
}
jl_array_t *stack = NULL;
jl_array_t *bt = NULL;
jl_array_t *bt2 = NULL;
JL_GC_PUSH3(&stack, &bt, &bt2);
stack = jl_alloc_array_1d(jl_array_any_type, 0);
jl_excstack_t *excstack = task->excstack;
size_t itr = excstack ? excstack->top : 0;
int i = 0;
while (itr > 0 && i < max_entries) {
jl_array_ptr_1d_push(stack, jl_excstack_exception(excstack, itr));
if (include_bt) {
decode_backtrace(jl_excstack_bt_data(excstack, itr),
jl_excstack_bt_size(excstack, itr),
&bt, &bt2);
jl_array_ptr_1d_push(stack, (jl_value_t*)bt);
jl_array_ptr_1d_push(stack, (jl_value_t*)bt2);
}
itr = jl_excstack_next(excstack, itr);
i++;
}
JL_GC_POP();
return (jl_value_t*)stack;
}
#if defined(_OS_WINDOWS_)
// XXX: these caches should be per-thread
#ifdef _CPU_X86_64_
static UNWIND_HISTORY_TABLE HistoryTable;
#else
static struct {
DWORD64 dwAddr;
DWORD64 ImageBase;
} HistoryTable;
#endif
static PVOID CALLBACK JuliaFunctionTableAccess64(
_In_ HANDLE hProcess,
_In_ DWORD64 AddrBase)
{
//jl_printf(JL_STDOUT, "lookup %d\n", AddrBase);
#ifdef _CPU_X86_64_
DWORD64 ImageBase;
PRUNTIME_FUNCTION fn = RtlLookupFunctionEntry(AddrBase, &ImageBase, &HistoryTable);
if (fn)
return fn;
uv_mutex_lock(&jl_in_stackwalk);
PVOID ftable = SymFunctionTableAccess64(hProcess, AddrBase);
uv_mutex_unlock(&jl_in_stackwalk);
return ftable;
#else
return SymFunctionTableAccess64(hProcess, AddrBase);
#endif
}
static DWORD64 WINAPI JuliaGetModuleBase64(
_In_ HANDLE hProcess,
_In_ DWORD64 dwAddr)
{
//jl_printf(JL_STDOUT, "lookup base %d\n", dwAddr);
#ifdef _CPU_X86_64_
DWORD64 ImageBase;
PRUNTIME_FUNCTION fn = RtlLookupFunctionEntry(dwAddr, &ImageBase, &HistoryTable);
if (fn)
return ImageBase;
uv_mutex_lock(&jl_in_stackwalk);
DWORD64 fbase = SymGetModuleBase64(hProcess, dwAddr);
uv_mutex_unlock(&jl_in_stackwalk);
return fbase;
#else
if (dwAddr == HistoryTable.dwAddr)
return HistoryTable.ImageBase;
DWORD64 ImageBase = jl_getUnwindInfo(dwAddr);
if (ImageBase) {
HistoryTable.dwAddr = dwAddr;
HistoryTable.ImageBase = ImageBase;
return ImageBase;
}
return SymGetModuleBase64(hProcess, dwAddr);
#endif
}
// Might be called from unmanaged thread.
volatile int needsSymRefreshModuleList;
BOOL (WINAPI *hSymRefreshModuleList)(HANDLE);
JL_DLLEXPORT void jl_refresh_dbg_module_list(void)
{
if (needsSymRefreshModuleList && hSymRefreshModuleList != NULL) {
hSymRefreshModuleList(GetCurrentProcess());
needsSymRefreshModuleList = 0;
}
}
static int jl_unw_init(bt_cursor_t *cursor, bt_context_t *Context)
{
int result;
uv_mutex_lock(&jl_in_stackwalk);
jl_refresh_dbg_module_list();
#if !defined(_CPU_X86_64_)
memset(&cursor->stackframe, 0, sizeof(cursor->stackframe));
cursor->stackframe.AddrPC.Offset = Context->Eip;
cursor->stackframe.AddrStack.Offset = Context->Esp;
cursor->stackframe.AddrFrame.Offset = Context->Ebp;
cursor->stackframe.AddrPC.Mode = AddrModeFlat;
cursor->stackframe.AddrStack.Mode = AddrModeFlat;
cursor->stackframe.AddrFrame.Mode = AddrModeFlat;
cursor->context = *Context;
result = StackWalk64(IMAGE_FILE_MACHINE_I386, GetCurrentProcess(), hMainThread,
&cursor->stackframe, &cursor->context, NULL, JuliaFunctionTableAccess64,
JuliaGetModuleBase64, NULL);
#else
*cursor = *Context;
result = 1;
#endif
uv_mutex_unlock(&jl_in_stackwalk);
return result;
}
static int readable_pointer(LPCVOID pointer)
{
// Check whether the pointer is valid and executable before dereferencing
// to avoid segfault while recording. See #10638.
MEMORY_BASIC_INFORMATION mInfo;
if (VirtualQuery(pointer, &mInfo, sizeof(MEMORY_BASIC_INFORMATION)) == 0)
return 0;
DWORD X = mInfo.AllocationProtect;
if (!((X&PAGE_READONLY) || (X&PAGE_READWRITE) || (X&PAGE_WRITECOPY) || (X&PAGE_EXECUTE_READ)) ||
(X&PAGE_GUARD) || (X&PAGE_NOACCESS))
return 0;
return 1;
}
static int jl_unw_step(bt_cursor_t *cursor, int from_signal_handler, uintptr_t *ip, uintptr_t *sp)
{
// Might be called from unmanaged thread.
#ifndef _CPU_X86_64_
*ip = (uintptr_t)cursor->stackframe.AddrPC.Offset;
*sp = (uintptr_t)cursor->stackframe.AddrStack.Offset;
if (*ip == 0) {
if (!readable_pointer((LPCVOID)*sp))
return 0;
cursor->stackframe.AddrPC.Offset = *(DWORD32*)*sp; // POP EIP (aka RET)
cursor->stackframe.AddrStack.Offset += sizeof(void*);
return cursor->stackframe.AddrPC.Offset != 0;
}
BOOL result = StackWalk64(IMAGE_FILE_MACHINE_I386, GetCurrentProcess(), hMainThread,
&cursor->stackframe, &cursor->context, NULL, JuliaFunctionTableAccess64, JuliaGetModuleBase64, NULL);
return result;
#else
*ip = (uintptr_t)cursor->Rip;
*sp = (uintptr_t)cursor->Rsp;
if (*ip == 0 && from_signal_handler) {
if (!readable_pointer((LPCVOID)*sp))
return 0;
cursor->Rip = *(DWORD64*)*sp; // POP RIP (aka RET)
cursor->Rsp += sizeof(void*);
return cursor->Rip != 0;
}
DWORD64 ImageBase = JuliaGetModuleBase64(GetCurrentProcess(), cursor->Rip - !from_signal_handler);
if (!ImageBase)
return 0;
PRUNTIME_FUNCTION FunctionEntry = (PRUNTIME_FUNCTION)JuliaFunctionTableAccess64(
GetCurrentProcess(), cursor->Rip - !from_signal_handler);
if (!FunctionEntry) {
// Not code or bad unwind?
return 0;
}
else {
PVOID HandlerData;
DWORD64 EstablisherFrame;
(void)RtlVirtualUnwind(
0 /*UNW_FLAG_NHANDLER*/,
ImageBase,
cursor->Rip,
FunctionEntry,
cursor,
&HandlerData,
&EstablisherFrame,
NULL);
}
return cursor->Rip != 0;
#endif
}
#elif !defined(JL_DISABLE_LIBUNWIND)
// stacktrace using libunwind
static int jl_unw_init(bt_cursor_t *cursor, bt_context_t *context)
{
return unw_init_local(cursor, context) == 0;
}
static int jl_unw_step(bt_cursor_t *cursor, int from_signal_handler, uintptr_t *ip, uintptr_t *sp)
{
(void)from_signal_handler; // libunwind also tracks this
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;
}
#ifdef LLVMLIBUNWIND
NOINLINE size_t rec_backtrace_ctx_dwarf(jl_bt_element_t *bt_data, size_t maxsize,
bt_context_t *context, jl_gcframe_t *pgcstack)
{
size_t bt_size = 0;
bt_cursor_t cursor;
if (unw_init_local_dwarf(&cursor, context) != UNW_ESUCCESS)
return 0;
jl_unw_stepn(&cursor, bt_data, &bt_size, NULL, maxsize, 0, &pgcstack, 1);
return bt_size;
}
#endif
#else
// stacktraces are disabled
static int jl_unw_init(bt_cursor_t *cursor, bt_context_t *context)
{
return 0;
}
static int jl_unw_step(bt_cursor_t *cursor, int from_signal_handler, uintptr_t *ip, uintptr_t *sp)
{
return 0;
}
#endif
JL_DLLEXPORT jl_value_t *jl_lookup_code_address(void *ip, int skipC)
{
jl_task_t *ct = jl_current_task;
jl_frame_t *frames = NULL;
int8_t gc_state = jl_gc_safe_enter(ct->ptls);
int n = jl_getFunctionInfo(&frames, (uintptr_t)ip, skipC, 0);
jl_gc_safe_leave(ct->ptls, gc_state);
jl_value_t *rs = (jl_value_t*)jl_alloc_svec(n);
JL_GC_PUSH1(&rs);
for (int i = 0; i < n; i++) {
jl_frame_t frame = frames[i];
jl_value_t *r = (jl_value_t*)jl_alloc_svec(6);
jl_svecset(rs, i, r);
if (frame.func_name)
jl_svecset(r, 0, jl_symbol(frame.func_name));
else
jl_svecset(r, 0, jl_empty_sym);
free(frame.func_name);
if (frame.file_name)
jl_svecset(r, 1, jl_symbol(frame.file_name));
else
jl_svecset(r, 1, jl_empty_sym);
free(frame.file_name);
jl_svecset(r, 2, jl_box_long(frame.line));
jl_svecset(r, 3, frame.linfo != NULL ? (jl_value_t*)frame.linfo : jl_nothing);
jl_svecset(r, 4, jl_box_bool(frame.fromC));
jl_svecset(r, 5, jl_box_bool(frame.inlined));
}
free(frames);
JL_GC_POP();
return rs;
}
static void jl_safe_print_codeloc(const char* func_name, const char* file_name,
int line, int inlined) JL_NOTSAFEPOINT
{
const char *inlined_str = inlined ? " [inlined]" : "";
if (line != -1) {
jl_safe_printf("%s at %s:%d%s\n", func_name, file_name, line, inlined_str);
}
else {
jl_safe_printf("%s at %s (unknown line)%s\n", func_name, file_name, inlined_str);
}
}
// Print function, file and line containing native instruction pointer `ip` by
// looking up debug info. Prints multiple such frames when `ip` points to
// inlined code.
void jl_print_native_codeloc(uintptr_t ip) JL_NOTSAFEPOINT
{
// This function is not allowed to reference any TLS variables since
// it can be called from an unmanaged thread on OSX.
// it means calling getFunctionInfo with noInline = 1
jl_frame_t *frames = NULL;
int n = jl_getFunctionInfo(&frames, ip, 0, 0);
int i;
for (i = 0; i < n; i++) {
jl_frame_t frame = frames[i];
if (!frame.func_name) {
jl_safe_printf("unknown function (ip: %p)\n", (void*)ip);
}
else {
jl_safe_print_codeloc(frame.func_name, frame.file_name, frame.line, frame.inlined);
free(frame.func_name);
free(frame.file_name);
}
}
free(frames);
}
// Print code location for backtrace buffer entry at *bt_entry
void jl_print_bt_entry_codeloc(jl_bt_element_t *bt_entry) JL_NOTSAFEPOINT
{
if (jl_bt_is_native(bt_entry)) {
jl_print_native_codeloc(bt_entry[0].uintptr);
}
else if (jl_bt_entry_tag(bt_entry) == JL_BT_INTERP_FRAME_TAG) {
size_t ip = jl_bt_entry_header(bt_entry);
jl_value_t *code = jl_bt_entry_jlvalue(bt_entry, 0);
if (jl_is_method_instance(code)) {
// When interpreting a method instance, need to unwrap to find the code info
code = jl_atomic_load_relaxed(&((jl_method_instance_t*)code)->uninferred);
}
if (jl_is_code_info(code)) {
jl_code_info_t *src = (jl_code_info_t*)code;
// See also the debug info handling in codegen.cpp.
// NB: debuginfoloc is 1-based!
intptr_t debuginfoloc = jl_array_data(src->codelocs, int32_t)[ip];
while (debuginfoloc != 0) {
jl_line_info_node_t *locinfo = (jl_line_info_node_t*)
jl_array_ptr_ref(src->linetable, debuginfoloc - 1);
assert(jl_typetagis(locinfo, jl_lineinfonode_type));
const char *func_name = "Unknown";
jl_value_t *method = locinfo->method;
if (jl_is_method_instance(method))
method = ((jl_method_instance_t*)method)->def.value;
if (jl_is_method(method))
method = (jl_value_t*)((jl_method_t*)method)->name;
if (jl_is_symbol(method))
func_name = jl_symbol_name((jl_sym_t*)method);
jl_safe_print_codeloc(func_name, jl_symbol_name(locinfo->file),
locinfo->line, locinfo->inlined_at);
debuginfoloc = locinfo->inlined_at;
}
}
else {
// If we're using this function something bad has already happened;
// be a bit defensive to avoid crashing while reporting the crash.
jl_safe_printf("No code info - unknown interpreter state!\n");
}
}
else {
jl_safe_printf("Non-native bt entry with tag and header bits 0x%" PRIxPTR "\n",
bt_entry[1].uintptr);
}
}
#ifdef _OS_LINUX_
#if defined(__GLIBC__) && defined(_CPU_AARCH64_)
#define LONG_JMP_SP_ENV_SLOT 13
static uintptr_t julia_longjmp_xor_key;
// GLIBC mangles the function pointers in jmp_buf (used in {set,long}*jmp
// functions) by XORing them with a random key. For AArch64 it is a global
// variable rather than a TCB one (as for x86_64/powerpc). We obtain the key by
// issuing a setjmp and XORing the SP pointer values to derive the key.
static void JuliaInitializeLongjmpXorKey(void)
{
// 1. Call REAL(setjmp), which stores the mangled SP in env.
jmp_buf env;
_setjmp(env);
// 2. Retrieve vanilla/mangled SP.
uintptr_t sp;
asm("mov %0, sp" : "=r" (sp));
uintptr_t mangled_sp = ((uintptr_t*)&env)[LONG_JMP_SP_ENV_SLOT];
// 3. xor SPs to obtain key.
julia_longjmp_xor_key = mangled_sp ^ sp;
}
#endif
JL_UNUSED static uintptr_t ptr_demangle(uintptr_t p) JL_NOTSAFEPOINT
{
#if defined(__GLIBC__)
#if defined(_CPU_X86_)
// from https://github.com/bminor/glibc/blame/master/sysdeps/unix/sysv/linux/i386/sysdep.h
// last changed for GLIBC_2.6 on 2007-02-01
asm(" rorl $9, %0\n"
" xorl %%gs:0x18, %0"
: "=r"(p) : "0"(p) : );
#elif defined(_CPU_X86_64_)
// from https://github.com/bminor/glibc/blame/master/sysdeps/unix/sysv/linux/i386/sysdep.h
asm(" rorq $17, %0\n"
" xorq %%fs:0x30, %0"
: "=r"(p) : "0"(p) : );
#elif defined(_CPU_AARCH64_)
// from https://github.com/bminor/glibc/blame/master/sysdeps/unix/sysv/linux/aarch64/sysdep.h
// We need to use a trick like this (from GCC/LLVM TSAN) to get access to it:
// https://github.com/llvm/llvm-project/commit/daa3ebce283a753f280c549cdb103fbb2972f08e
static pthread_once_t once = PTHREAD_ONCE_INIT;
pthread_once(&once, &JuliaInitializeLongjmpXorKey);
p ^= julia_longjmp_xor_key;
#elif defined(_CPU_ARM_)
// from https://github.com/bminor/glibc/blame/master/sysdeps/unix/sysv/linux/arm/sysdep.h
; // nothing to do
#endif
#endif
return p;
}
#endif
// n.b. musl does not mangle pointers, but intentionally makes that impossible
// to determine (https://www.openwall.com/lists/musl/2013/03/29/13) so we do
// not support musl here.
// n.b. We have not looked at other libc (e.g. ulibc), though they are probably
// often compatible with glibc (perhaps with or without pointer mangling).
#ifdef _OS_DARWIN_
// from https://github.com/apple/darwin-xnu/blame/main/libsyscall/os/tsd.h
#define __TSD_PTR_MUNGE 7
#if defined(__i386__) || defined(__x86_64__)
#if defined(__has_attribute)
#if __has_attribute(address_space)
#define OS_GS_RELATIVE __attribute__((address_space(256)))
#endif
#endif
#ifdef OS_GS_RELATIVE
#define _os_tsd_get_base() ((void * OS_GS_RELATIVE *)0)
#else
__attribute__((always_inline))
static __inline__ void*
_os_tsd_get_direct(unsigned long slot)
{
void *ret;
__asm__("mov %%gs:%1, %0" : "=r" (ret) : "m" (*(void **)(slot * sizeof(void *))));
return ret;
}
#endif
#elif defined(__arm__) || defined(__arm64__)
// Unconditionally defined ptrauth_strip (instead of using the ptrauth.h header)
// since libsystem will likely be compiled with -mbranch-protection, and we currently are not.
// code from https://github.com/llvm/llvm-project/blob/7714e0317520207572168388f22012dd9e152e9e/compiler-rt/lib/sanitizer_common/sanitizer_ptrauth.h
static inline uint64_t ptrauth_strip(uint64_t __value, unsigned int __key) JL_NOTSAFEPOINT {
// On the stack the link register is protected with Pointer
// Authentication Code when compiled with -mbranch-protection.
// Let's strip the PAC unconditionally because xpaclri is in the NOP space,
// so will do nothing when it is not enabled or not available.
uint64_t ret;
asm volatile(
"mov x30, %1\n\t"
"hint #7\n\t" // xpaclri
"mov %0, x30\n\t"
: "=r"(ret)
: "r"(__value)
: "x30");
return ret;
}
__attribute__((always_inline, pure))
static __inline__ void**
_os_tsd_get_base(void) JL_NOTSAFEPOINT
{
#if defined(__arm__)
uintptr_t tsd;
__asm__("mrc p15, 0, %0, c13, c0, 3\n"
"bic %0, %0, #0x3\n" : "=r" (tsd));
/* lower 2-bits contain CPU number */
#elif defined(__arm64__)
uint64_t tsd;
__asm__("mrs %0, TPIDRRO_EL0\n"
"bic %0, %0, #0x7\n" : "=r" (tsd));
/* lower 3-bits contain CPU number */
#endif
return (void**)(uintptr_t)tsd;
}
#define _os_tsd_get_base() _os_tsd_get_base()
#endif
#ifdef _os_tsd_get_base
__attribute__((always_inline))
static __inline__ void*
_os_tsd_get_direct(unsigned long slot) JL_NOTSAFEPOINT
{
return _os_tsd_get_base()[slot];
}
#endif
__attribute__((always_inline, pure))
static __inline__ uintptr_t
_os_ptr_munge_token(void) JL_NOTSAFEPOINT
{
return (uintptr_t)_os_tsd_get_direct(__TSD_PTR_MUNGE);
}
__attribute__((always_inline, pure))
JL_UNUSED static __inline__ uintptr_t
_os_ptr_munge(uintptr_t ptr) JL_NOTSAFEPOINT
{
return ptr ^ _os_ptr_munge_token();
}
#define _OS_PTR_UNMUNGE(_ptr) _os_ptr_munge((uintptr_t)(_ptr))
#endif
extern bt_context_t *jl_to_bt_context(void *sigctx);
static void jl_rec_backtrace(jl_task_t *t) JL_NOTSAFEPOINT
{
jl_task_t *ct = jl_current_task;
jl_ptls_t ptls = ct->ptls;
ptls->bt_size = 0;
if (t == ct) {
ptls->bt_size = rec_backtrace(ptls->bt_data, JL_MAX_BT_SIZE, 0);
return;
}
bt_context_t *context = NULL;
bt_context_t c;
int16_t old = -1;
while (!jl_atomic_cmpswap(&t->tid, &old, ptls->tid) && old != ptls->tid) {
int lockret = jl_lock_stackwalk();
// if this task is already running somewhere, we need to stop the thread it is running on and query its state
if (!jl_thread_suspend_and_get_state(old, 0, &c)) {
jl_unlock_stackwalk(lockret);
return;
}
jl_unlock_stackwalk(lockret);
if (jl_atomic_load_relaxed(&t->tid) == old) {
jl_ptls_t ptls2 = jl_atomic_load_relaxed(&jl_all_tls_states)[old];
if (ptls2->previous_task == t || // we might print the wrong stack here, since we can't know whether we executed the swapcontext yet or not, but it at least avoids trying to access the state inside uc_mcontext which might not be set yet
(ptls2->previous_task == NULL && jl_atomic_load_relaxed(&ptls2->current_task) == t)) { // this case should be always accurate
// use the thread context for the unwind state
context = &c;
}
break;
}
// got the wrong thread stopped, try again
jl_thread_resume(old);
}
if (context == NULL && (!t->copy_stack && t->started && t->stkbuf != NULL)) {
// need to read the context from the task stored state
#if defined(_OS_WINDOWS_)
memset(&c, 0, sizeof(c));
_JUMP_BUFFER *mctx = (_JUMP_BUFFER*)&t->ctx.ctx.uc_mcontext;
#if defined(_CPU_X86_64_)
c.Rbx = mctx->Rbx;
c.Rsp = mctx->Rsp;
c.Rbp = mctx->Rbp;
c.Rsi = mctx->Rsi;
c.Rdi = mctx->Rdi;
c.R12 = mctx->R12;
c.R13 = mctx->R13;
c.R14 = mctx->R14;
c.R15 = mctx->R15;
c.Rip = mctx->Rip;
memcpy(&c.Xmm6, &mctx->Xmm6, 10 * sizeof(mctx->Xmm6)); // Xmm6-Xmm15
#else
c.Eip = mctx->Eip;
c.Esp = mctx->Esp;
c.Ebp = mctx->Ebp;
#endif
context = &c;
#elif defined(JL_HAVE_UNW_CONTEXT)
context = &t->ctx.ctx;
#elif defined(JL_HAVE_UCONTEXT)
context = jl_to_bt_context(&t->ctx.ctx);
#elif defined(JL_HAVE_ASM)
memset(&c, 0, sizeof(c));
#if defined(_OS_LINUX_) && defined(__GLIBC__)
__jmp_buf *mctx = &t->ctx.ctx.uc_mcontext->__jmpbuf;
mcontext_t *mc = &c.uc_mcontext;
#if defined(_CPU_X86_)
// https://github.com/bminor/glibc/blame/master/sysdeps/i386/__longjmp.S
// https://github.com/bminor/glibc/blame/master/sysdeps/i386/jmpbuf-offsets.h
// https://github.com/bminor/musl/blame/master/src/setjmp/i386/longjmp.s
mc->gregs[REG_EBX] = (*mctx)[0];
mc->gregs[REG_ESI] = (*mctx)[1];
mc->gregs[REG_EDI] = (*mctx)[2];
mc->gregs[REG_EBP] = (*mctx)[3];
mc->gregs[REG_ESP] = (*mctx)[4];
mc->gregs[REG_EIP] = (*mctx)[5];
// ifdef PTR_DEMANGLE ?
mc->gregs[REG_ESP] = ptr_demangle(mc->gregs[REG_ESP]);
mc->gregs[REG_EIP] = ptr_demangle(mc->gregs[REG_EIP]);
context = &c;
#elif defined(_CPU_X86_64_)
// https://github.com/bminor/glibc/blame/master/sysdeps/x86_64/__longjmp.S
// https://github.com/bminor/glibc/blame/master/sysdeps/x86_64/jmpbuf-offsets.h
// https://github.com/bminor/musl/blame/master/src/setjmp/x86_64/setjmp.s
mc->gregs[REG_RBX] = (*mctx)[0];
mc->gregs[REG_RBP] = (*mctx)[1];
mc->gregs[REG_R12] = (*mctx)[2];
mc->gregs[REG_R13] = (*mctx)[3];
mc->gregs[REG_R14] = (*mctx)[4];
mc->gregs[REG_R15] = (*mctx)[5];
mc->gregs[REG_RSP] = (*mctx)[6];
mc->gregs[REG_RIP] = (*mctx)[7];
// ifdef PTR_DEMANGLE ?
mc->gregs[REG_RBP] = ptr_demangle(mc->gregs[REG_RBP]);
mc->gregs[REG_RSP] = ptr_demangle(mc->gregs[REG_RSP]);
mc->gregs[REG_RIP] = ptr_demangle(mc->gregs[REG_RIP]);
context = &c;
#elif defined(_CPU_ARM_)
// https://github.com/bminor/glibc/blame/master/sysdeps/arm/__longjmp.S
// https://github.com/bminor/glibc/blame/master/sysdeps/arm/include/bits/setjmp.h
// https://github.com/bminor/musl/blame/master/src/setjmp/arm/longjmp.S
mc->arm_sp = (*mctx)[0];
mc->arm_lr = (*mctx)[1];
mc->arm_r4 = (*mctx)[2]; // aka v1
mc->arm_r5 = (*mctx)[3]; // aka v2
mc->arm_r6 = (*mctx)[4]; // aka v3
mc->arm_r7 = (*mctx)[5]; // aka v4
mc->arm_r8 = (*mctx)[6]; // aka v5
mc->arm_r9 = (*mctx)[7]; // aka v6 aka sb
mc->arm_r10 = (*mctx)[8]; // aka v7 aka sl
mc->arm_fp = (*mctx)[10]; // aka v8 aka r11
// ifdef PTR_DEMANGLE ?
mc->arm_sp = ptr_demangle(mc->arm_sp);
mc->arm_lr = ptr_demangle(mc->arm_lr);
mc->arm_pc = mc->arm_lr;
context = &c;
#elif defined(_CPU_AARCH64_)
// https://github.com/bminor/glibc/blame/master/sysdeps/aarch64/__longjmp.S
// https://github.com/bminor/glibc/blame/master/sysdeps/aarch64/jmpbuf-offsets.h
// https://github.com/bminor/musl/blame/master/src/setjmp/aarch64/longjmp.s
// https://github.com/libunwind/libunwind/blob/ec171c9ba7ea3abb2a1383cee2988a7abd483a1f/src/aarch64/unwind_i.h#L62
unw_fpsimd_context_t *mcfp = (unw_fpsimd_context_t*)&mc->__reserved;
mc->regs[19] = (*mctx)[0];
mc->regs[20] = (*mctx)[1];
mc->regs[21] = (*mctx)[2];
mc->regs[22] = (*mctx)[3];
mc->regs[23] = (*mctx)[4];
mc->regs[24] = (*mctx)[5];
mc->regs[25] = (*mctx)[6];
mc->regs[26] = (*mctx)[7];
mc->regs[27] = (*mctx)[8];
mc->regs[28] = (*mctx)[9];
mc->regs[29] = (*mctx)[10]; // aka fp
mc->regs[30] = (*mctx)[11]; // aka lr
// Yes, they did skip 12 why writing the code originally; and, no, I do not know why.
mc->sp = (*mctx)[13];
mcfp->vregs[7] = (*mctx)[14]; // aka d8
mcfp->vregs[8] = (*mctx)[15]; // aka d9
mcfp->vregs[9] = (*mctx)[16]; // aka d10
mcfp->vregs[10] = (*mctx)[17]; // aka d11
mcfp->vregs[11] = (*mctx)[18]; // aka d12
mcfp->vregs[12] = (*mctx)[19]; // aka d13
mcfp->vregs[13] = (*mctx)[20]; // aka d14
mcfp->vregs[14] = (*mctx)[21]; // aka d15
// ifdef PTR_DEMANGLE ?
mc->sp = ptr_demangle(mc->sp);
mc->regs[30] = ptr_demangle(mc->regs[30]);
mc->pc = mc->regs[30];
context = &c;
#else
#pragma message("jl_rec_backtrace not defined for ASM/SETJMP on unknown linux")
(void)mc;
(void)c;
(void)mctx;
#endif
#elif defined(_OS_DARWIN_)
sigjmp_buf *mctx = &t->ctx.ctx.uc_mcontext;
#if defined(_CPU_X86_64_)
// from https://github.com/apple/darwin-libplatform/blob/main/src/setjmp/x86_64/_setjmp.s
x86_thread_state64_t *mc = (x86_thread_state64_t*)&c;
mc->__rbx = ((uint64_t*)mctx)[0];
mc->__rbp = ((uint64_t*)mctx)[1];
mc->__rsp = ((uint64_t*)mctx)[2];
mc->__r12 = ((uint64_t*)mctx)[3];
mc->__r13 = ((uint64_t*)mctx)[4];
mc->__r14 = ((uint64_t*)mctx)[5];
mc->__r15 = ((uint64_t*)mctx)[6];
mc->__rip = ((uint64_t*)mctx)[7];
// added in libsystem_platform 177.200.16 (macOS Mojave 10.14.3)
// prior to that _os_ptr_munge_token was (hopefully) typically 0,
// so x ^ 0 == x and this is a no-op
mc->__rbp = _OS_PTR_UNMUNGE(mc->__rbp);
mc->__rsp = _OS_PTR_UNMUNGE(mc->__rsp);
mc->__rip = _OS_PTR_UNMUNGE(mc->__rip);
context = &c;
#elif defined(_CPU_AARCH64_)
// from https://github.com/apple/darwin-libplatform/blob/main/src/setjmp/arm64/setjmp.s
// https://github.com/apple/darwin-xnu/blob/main/osfmk/mach/arm/_structs.h
// https://github.com/llvm/llvm-project/blob/7714e0317520207572168388f22012dd9e152e9e/libunwind/src/Registers.hpp -> Registers_arm64
arm_thread_state64_t *mc = (arm_thread_state64_t*)&c;
mc->__x[19] = ((uint64_t*)mctx)[0];
mc->__x[20] = ((uint64_t*)mctx)[1];
mc->__x[21] = ((uint64_t*)mctx)[2];
mc->__x[22] = ((uint64_t*)mctx)[3];
mc->__x[23] = ((uint64_t*)mctx)[4];
mc->__x[24] = ((uint64_t*)mctx)[5];
mc->__x[25] = ((uint64_t*)mctx)[6];
mc->__x[26] = ((uint64_t*)mctx)[7];
mc->__x[27] = ((uint64_t*)mctx)[8];
mc->__x[28] = ((uint64_t*)mctx)[9];
mc->__x[10] = ((uint64_t*)mctx)[10];
mc->__x[11] = ((uint64_t*)mctx)[11];
mc->__x[12] = ((uint64_t*)mctx)[12];
// 13 is reserved/unused
double *mcfp = (double*)&mc[1];
mcfp[7] = ((uint64_t*)mctx)[14]; // aka d8
mcfp[8] = ((uint64_t*)mctx)[15]; // aka d9
mcfp[9] = ((uint64_t*)mctx)[16]; // aka d10
mcfp[10] = ((uint64_t*)mctx)[17]; // aka d11
mcfp[11] = ((uint64_t*)mctx)[18]; // aka d12
mcfp[12] = ((uint64_t*)mctx)[19]; // aka d13
mcfp[13] = ((uint64_t*)mctx)[20]; // aka d14
mcfp[14] = ((uint64_t*)mctx)[21]; // aka d15
mc->__fp = _OS_PTR_UNMUNGE(mc->__x[10]);
mc->__lr = _OS_PTR_UNMUNGE(mc->__x[11]);
mc->__x[12] = _OS_PTR_UNMUNGE(mc->__x[12]);
mc->__sp = mc->__x[12];
// libunwind is broken for signed-pointers, but perhaps best not to leave the signed pointer lying around either
mc->__pc = ptrauth_strip(mc->__lr, 0);
mc->__pad = 0; // aka __ra_sign_state = not signed
context = &c;
#else
#pragma message("jl_rec_backtrace not defined for ASM/SETJMP on unknown darwin")
(void)mctx;
(void)c;
#endif
#elif defined(_OS_FREEBSD_) && defined(_CPU_X86_64_)
sigjmp_buf *mctx = &t->ctx.ctx.uc_mcontext;
mcontext_t *mc = &c.uc_mcontext;
// https://github.com/freebsd/freebsd-src/blob/releng/13.1/lib/libc/amd64/gen/_setjmp.S
mc->mc_rip = ((long*)mctx)[0];
mc->mc_rbx = ((long*)mctx)[1];
mc->mc_rsp = ((long*)mctx)[2];
mc->mc_rbp = ((long*)mctx)[3];
mc->mc_r12 = ((long*)mctx)[4];
mc->mc_r13 = ((long*)mctx)[5];
mc->mc_r14 = ((long*)mctx)[6];
mc->mc_r15 = ((long*)mctx)[7];
context = &c;
#else
#pragma message("jl_rec_backtrace not defined for ASM/SETJMP on unknown system")
(void)c;
#endif
#elif defined(JL_HAVE_ASYNCIFY)
#pragma message("jl_rec_backtrace not defined for ASYNCIFY")
#elif defined(JL_HAVE_SIGALTSTACK)
#pragma message("jl_rec_backtrace not defined for SIGALTSTACK")
#else
#pragma message("jl_rec_backtrace not defined for unknown task system")
#endif
}
if (context)
ptls->bt_size = rec_backtrace_ctx(ptls->bt_data, JL_MAX_BT_SIZE, context, t->gcstack);
if (old == -1)
jl_atomic_store_relaxed(&t->tid, old);
else if (old != ptls->tid)
jl_thread_resume(old);
}
//--------------------------------------------------
// Tools for interactive debugging in gdb
JL_DLLEXPORT void jl_gdblookup(void* ip)
{
jl_print_native_codeloc((uintptr_t)ip);
}
// Print backtrace for current exception in catch block
JL_DLLEXPORT void jlbacktrace(void) JL_NOTSAFEPOINT
{
jl_task_t *ct = jl_current_task;
if (ct->ptls == NULL)
return;
jl_excstack_t *s = ct->excstack;
if (!s)
return;
size_t i, bt_size = jl_excstack_bt_size(s, s->top);
jl_bt_element_t *bt_data = jl_excstack_bt_data(s, s->top);
for (i = 0; i < bt_size; i += jl_bt_entry_size(bt_data + i)) {
jl_print_bt_entry_codeloc(bt_data + i);
}
}
// Print backtrace for specified task to jl_safe_printf stderr
JL_DLLEXPORT void jlbacktracet(jl_task_t *t) JL_NOTSAFEPOINT
{
jl_task_t *ct = jl_current_task;
jl_ptls_t ptls = ct->ptls;
jl_rec_backtrace(t);
size_t i, bt_size = ptls->bt_size;
jl_bt_element_t *bt_data = ptls->bt_data;
for (i = 0; i < bt_size; i += jl_bt_entry_size(bt_data + i)) {
jl_print_bt_entry_codeloc(bt_data + i);
}
}
JL_DLLEXPORT void jl_print_backtrace(void) JL_NOTSAFEPOINT
{
jlbacktrace();
}
extern int gc_first_tid;
// Print backtraces for all live tasks, for all threads, to jl_safe_printf stderr
JL_DLLEXPORT void jl_print_task_backtraces(int show_done) JL_NOTSAFEPOINT
{
size_t nthreads = jl_atomic_load_acquire(&jl_n_threads);
jl_ptls_t *allstates = jl_atomic_load_relaxed(&jl_all_tls_states);
for (size_t i = 0; i < nthreads; i++) {
// skip GC threads since they don't have tasks
if (gc_first_tid <= i && i < gc_first_tid + jl_n_gcthreads) {
continue;
}
jl_ptls_t ptls2 = allstates[i];
if (ptls2 == NULL) {
continue;
}
small_arraylist_t *live_tasks = &ptls2->heap.live_tasks;
size_t n = mtarraylist_length(live_tasks);
int t_state = JL_TASK_STATE_DONE;
jl_task_t *t = ptls2->root_task;
if (t != NULL)
t_state = jl_atomic_load_relaxed(&t->_state);
jl_safe_printf("==== Thread %d created %zu live tasks\n",
ptls2->tid + 1, n + (t_state != JL_TASK_STATE_DONE));
if (show_done || t_state != JL_TASK_STATE_DONE) {
jl_safe_printf(" ---- Root task (%p)\n", ptls2->root_task);
if (t != NULL) {
jl_safe_printf(" (sticky: %d, started: %d, state: %d, tid: %d)\n",
t->sticky, t->started, t_state,
jl_atomic_load_relaxed(&t->tid) + 1);
if (t->stkbuf != NULL) {
jlbacktracet(t);
}
else {
jl_safe_printf(" no stack\n");
}
}
jl_safe_printf(" ---- End root task\n");
}
for (size_t j = 0; j < n; j++) {
jl_task_t *t = (jl_task_t*)mtarraylist_get(live_tasks, j);
if (t == NULL)
continue;
int t_state = jl_atomic_load_relaxed(&t->_state);
if (!show_done && t_state == JL_TASK_STATE_DONE)
continue;
jl_safe_printf(" ---- Task %zu (%p)\n", j + 1, t);
// n.b. this information might not be consistent with the stack printing after it, since it could start running or change tid, etc.
jl_safe_printf(" (sticky: %d, started: %d, state: %d, tid: %d)\n",
t->sticky, t->started, t_state,
jl_atomic_load_relaxed(&t->tid) + 1);
if (t->stkbuf != NULL)
jlbacktracet(t);
else
jl_safe_printf(" no stack\n");
jl_safe_printf(" ---- End task %zu\n", j + 1);
}
jl_safe_printf("==== End thread %d\n", ptls2->tid + 1);
}
jl_safe_printf("==== Done\n");
}
#ifdef __cplusplus
}
#endif
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