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1800 lines (1570 loc) · 46.2 KB
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#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#include "Python.h"
#include <internal/pycore_debug_offsets.h> // _Py_DebugOffsets
#include <internal/pycore_frame.h> // FRAME_SUSPENDED_YIELD_FROM
#include <internal/pycore_interpframe.h> // FRAME_OWNED_BY_CSTACK
#include <internal/pycore_llist.h> // struct llist_node
#include <internal/pycore_stackref.h> // Py_TAG_BITS
#include "../Python/remote_debug.h"
#ifndef HAVE_PROCESS_VM_READV
# define HAVE_PROCESS_VM_READV 0
#endif
struct _Py_AsyncioModuleDebugOffsets {
struct _asyncio_task_object {
uint64_t size;
uint64_t task_name;
uint64_t task_awaited_by;
uint64_t task_is_task;
uint64_t task_awaited_by_is_set;
uint64_t task_coro;
uint64_t task_node;
} asyncio_task_object;
struct _asyncio_interpreter_state {
uint64_t size;
uint64_t asyncio_tasks_head;
} asyncio_interpreter_state;
struct _asyncio_thread_state {
uint64_t size;
uint64_t asyncio_running_loop;
uint64_t asyncio_running_task;
uint64_t asyncio_tasks_head;
} asyncio_thread_state;
};
// Helper to chain exceptions and avoid repetitions
static void
chain_exceptions(PyObject *exception, const char *string)
{
PyObject *exc = PyErr_GetRaisedException();
PyErr_SetString(exception, string);
_PyErr_ChainExceptions1(exc);
}
// Get the PyAsyncioDebug section address for any platform
static uintptr_t
_Py_RemoteDebug_GetAsyncioDebugAddress(proc_handle_t* handle)
{
uintptr_t address;
#ifdef MS_WINDOWS
// On Windows, search for asyncio debug in executable or DLL
address = search_windows_map_for_section(handle, "AsyncioD", L"_asyncio");
#elif defined(__linux__)
// On Linux, search for asyncio debug in executable or DLL
address = search_linux_map_for_section(handle, "AsyncioDebug", "_asyncio.cpython");
#elif defined(__APPLE__) && TARGET_OS_OSX
// On macOS, try libpython first, then fall back to python
address = search_map_for_section(handle, "AsyncioDebug", "_asyncio.cpython");
if (address == 0) {
PyErr_Clear();
address = search_map_for_section(handle, "AsyncioDebug", "_asyncio.cpython");
}
#else
Py_UNREACHABLE();
#endif
return address;
}
static inline int
read_ptr(proc_handle_t *handle, uintptr_t address, uintptr_t *ptr_addr)
{
int result = _Py_RemoteDebug_ReadRemoteMemory(handle, address, sizeof(void*), ptr_addr);
if (result < 0) {
return -1;
}
return 0;
}
static inline int
read_Py_ssize_t(proc_handle_t *handle, uintptr_t address, Py_ssize_t *size)
{
int result = _Py_RemoteDebug_ReadRemoteMemory(handle, address, sizeof(Py_ssize_t), size);
if (result < 0) {
return -1;
}
return 0;
}
static int
read_py_ptr(proc_handle_t *handle, uintptr_t address, uintptr_t *ptr_addr)
{
if (read_ptr(handle, address, ptr_addr)) {
return -1;
}
*ptr_addr &= ~Py_TAG_BITS;
return 0;
}
static int
read_char(proc_handle_t *handle, uintptr_t address, char *result)
{
int res = _Py_RemoteDebug_ReadRemoteMemory(handle, address, sizeof(char), result);
if (res < 0) {
return -1;
}
return 0;
}
static int
read_sized_int(proc_handle_t *handle, uintptr_t address, void *result, size_t size)
{
int res = _Py_RemoteDebug_ReadRemoteMemory(handle, address, size, result);
if (res < 0) {
return -1;
}
return 0;
}
static int
read_unsigned_long(proc_handle_t *handle, uintptr_t address, unsigned long *result)
{
int res = _Py_RemoteDebug_ReadRemoteMemory(handle, address, sizeof(unsigned long), result);
if (res < 0) {
return -1;
}
return 0;
}
static int
read_pyobj(proc_handle_t *handle, uintptr_t address, PyObject *ptr_addr)
{
int res = _Py_RemoteDebug_ReadRemoteMemory(handle, address, sizeof(PyObject), ptr_addr);
if (res < 0) {
return -1;
}
return 0;
}
static PyObject *
read_py_str(
proc_handle_t *handle,
_Py_DebugOffsets* debug_offsets,
uintptr_t address,
Py_ssize_t max_len
) {
PyObject *result = NULL;
char *buf = NULL;
Py_ssize_t len;
int res = _Py_RemoteDebug_ReadRemoteMemory(
handle,
address + debug_offsets->unicode_object.length,
sizeof(Py_ssize_t),
&len
);
if (res < 0) {
goto err;
}
buf = (char *)PyMem_RawMalloc(len+1);
if (buf == NULL) {
PyErr_NoMemory();
return NULL;
}
size_t offset = debug_offsets->unicode_object.asciiobject_size;
res = _Py_RemoteDebug_ReadRemoteMemory(handle, address + offset, len, buf);
if (res < 0) {
goto err;
}
buf[len] = '\0';
result = PyUnicode_FromStringAndSize(buf, len);
if (result == NULL) {
goto err;
}
PyMem_RawFree(buf);
assert(result != NULL);
return result;
err:
if (buf != NULL) {
PyMem_RawFree(buf);
}
return NULL;
}
static PyObject *
read_py_bytes(
proc_handle_t *handle,
_Py_DebugOffsets* debug_offsets,
uintptr_t address
) {
PyObject *result = NULL;
char *buf = NULL;
Py_ssize_t len;
int res = _Py_RemoteDebug_ReadRemoteMemory(
handle,
address + debug_offsets->bytes_object.ob_size,
sizeof(Py_ssize_t),
&len
);
if (res < 0) {
goto err;
}
buf = (char *)PyMem_RawMalloc(len+1);
if (buf == NULL) {
PyErr_NoMemory();
return NULL;
}
size_t offset = debug_offsets->bytes_object.ob_sval;
res = _Py_RemoteDebug_ReadRemoteMemory(handle, address + offset, len, buf);
if (res < 0) {
goto err;
}
buf[len] = '\0';
result = PyBytes_FromStringAndSize(buf, len);
if (result == NULL) {
goto err;
}
PyMem_RawFree(buf);
assert(result != NULL);
return result;
err:
if (buf != NULL) {
PyMem_RawFree(buf);
}
return NULL;
}
static long
read_py_long(proc_handle_t *handle, _Py_DebugOffsets* offsets, uintptr_t address)
{
unsigned int shift = PYLONG_BITS_IN_DIGIT;
Py_ssize_t size;
uintptr_t lv_tag;
int bytes_read = _Py_RemoteDebug_ReadRemoteMemory(
handle, address + offsets->long_object.lv_tag,
sizeof(uintptr_t),
&lv_tag);
if (bytes_read < 0) {
return -1;
}
int negative = (lv_tag & 3) == 2;
size = lv_tag >> 3;
if (size == 0) {
return 0;
}
digit *digits = (digit *)PyMem_RawMalloc(size * sizeof(digit));
if (!digits) {
PyErr_NoMemory();
return -1;
}
bytes_read = _Py_RemoteDebug_ReadRemoteMemory(
handle,
address + offsets->long_object.ob_digit,
sizeof(digit) * size,
digits
);
if (bytes_read < 0) {
goto error;
}
long long value = 0;
// In theory this can overflow, but because of llvm/llvm-project#16778
// we can't use __builtin_mul_overflow because it fails to link with
// __muloti4 on aarch64. In practice this is fine because all we're
// testing here are task numbers that would fit in a single byte.
for (Py_ssize_t i = 0; i < size; ++i) {
long long factor = digits[i] * (1UL << (Py_ssize_t)(shift * i));
value += factor;
}
PyMem_RawFree(digits);
if (negative) {
value *= -1;
}
return (long)value;
error:
PyMem_RawFree(digits);
return -1;
}
static PyObject *
parse_task_name(
proc_handle_t *handle,
_Py_DebugOffsets* offsets,
struct _Py_AsyncioModuleDebugOffsets* async_offsets,
uintptr_t task_address
) {
uintptr_t task_name_addr;
int err = read_py_ptr(
handle,
task_address + async_offsets->asyncio_task_object.task_name,
&task_name_addr);
if (err) {
return NULL;
}
// The task name can be a long or a string so we need to check the type
PyObject task_name_obj;
err = read_pyobj(
handle,
task_name_addr,
&task_name_obj);
if (err) {
return NULL;
}
unsigned long flags;
err = read_unsigned_long(
handle,
(uintptr_t)task_name_obj.ob_type + offsets->type_object.tp_flags,
&flags);
if (err) {
return NULL;
}
if ((flags & Py_TPFLAGS_LONG_SUBCLASS)) {
long res = read_py_long(handle, offsets, task_name_addr);
if (res == -1) {
chain_exceptions(PyExc_RuntimeError, "Failed to get task name");
return NULL;
}
return PyUnicode_FromFormat("Task-%d", res);
}
if(!(flags & Py_TPFLAGS_UNICODE_SUBCLASS)) {
PyErr_SetString(PyExc_RuntimeError, "Invalid task name object");
return NULL;
}
return read_py_str(
handle,
offsets,
task_name_addr,
255
);
}
static int
parse_frame_object(
proc_handle_t *handle,
PyObject** result,
struct _Py_DebugOffsets* offsets,
uintptr_t address,
uintptr_t* previous_frame
);
static int
parse_coro_chain(
proc_handle_t *handle,
struct _Py_DebugOffsets* offsets,
struct _Py_AsyncioModuleDebugOffsets* async_offsets,
uintptr_t coro_address,
PyObject *render_to
) {
assert((void*)coro_address != NULL);
uintptr_t gen_type_addr;
int err = read_ptr(
handle,
coro_address + offsets->pyobject.ob_type,
&gen_type_addr);
if (err) {
return -1;
}
PyObject* name = NULL;
uintptr_t prev_frame;
if (parse_frame_object(
handle,
&name,
offsets,
coro_address + offsets->gen_object.gi_iframe,
&prev_frame)
< 0)
{
return -1;
}
if (PyList_Append(render_to, name)) {
Py_DECREF(name);
return -1;
}
Py_DECREF(name);
int8_t gi_frame_state;
err = read_sized_int(
handle,
coro_address + offsets->gen_object.gi_frame_state,
&gi_frame_state,
sizeof(int8_t)
);
if (err) {
return -1;
}
if (gi_frame_state == FRAME_SUSPENDED_YIELD_FROM) {
char owner;
err = read_char(
handle,
coro_address + offsets->gen_object.gi_iframe +
offsets->interpreter_frame.owner,
&owner
);
if (err) {
return -1;
}
if (owner != FRAME_OWNED_BY_GENERATOR) {
PyErr_SetString(
PyExc_RuntimeError,
"generator doesn't own its frame \\_o_/");
return -1;
}
uintptr_t stackpointer_addr;
err = read_py_ptr(
handle,
coro_address + offsets->gen_object.gi_iframe +
offsets->interpreter_frame.stackpointer,
&stackpointer_addr);
if (err) {
return -1;
}
if ((void*)stackpointer_addr != NULL) {
uintptr_t gi_await_addr;
err = read_py_ptr(
handle,
stackpointer_addr - sizeof(void*),
&gi_await_addr);
if (err) {
return -1;
}
if ((void*)gi_await_addr != NULL) {
uintptr_t gi_await_addr_type_addr;
int err = read_ptr(
handle,
gi_await_addr + offsets->pyobject.ob_type,
&gi_await_addr_type_addr);
if (err) {
return -1;
}
if (gen_type_addr == gi_await_addr_type_addr) {
/* This needs an explanation. We always start with parsing
native coroutine / generator frames. Ultimately they
are awaiting on something. That something can be
a native coroutine frame or... an iterator.
If it's the latter -- we can't continue building
our chain. So the condition to bail out of this is
to do that when the type of the current coroutine
doesn't match the type of whatever it points to
in its cr_await.
*/
err = parse_coro_chain(
handle,
offsets,
async_offsets,
gi_await_addr,
render_to
);
if (err) {
return -1;
}
}
}
}
}
return 0;
}
static int
parse_task_awaited_by(
proc_handle_t *handle,
struct _Py_DebugOffsets* offsets,
struct _Py_AsyncioModuleDebugOffsets* async_offsets,
uintptr_t task_address,
PyObject *awaited_by,
int recurse_task
);
static int
parse_task(
proc_handle_t *handle,
struct _Py_DebugOffsets* offsets,
struct _Py_AsyncioModuleDebugOffsets* async_offsets,
uintptr_t task_address,
PyObject *render_to,
int recurse_task
) {
char is_task;
int err = read_char(
handle,
task_address + async_offsets->asyncio_task_object.task_is_task,
&is_task);
if (err) {
return -1;
}
PyObject* result = PyList_New(0);
if (result == NULL) {
return -1;
}
PyObject *call_stack = PyList_New(0);
if (call_stack == NULL) {
goto err;
}
if (PyList_Append(result, call_stack)) {
Py_DECREF(call_stack);
goto err;
}
/* we can operate on a borrowed one to simplify cleanup */
Py_DECREF(call_stack);
if (is_task) {
PyObject *tn = NULL;
if (recurse_task) {
tn = parse_task_name(
handle, offsets, async_offsets, task_address);
} else {
tn = PyLong_FromUnsignedLongLong(task_address);
}
if (tn == NULL) {
goto err;
}
if (PyList_Append(result, tn)) {
Py_DECREF(tn);
goto err;
}
Py_DECREF(tn);
uintptr_t coro_addr;
err = read_py_ptr(
handle,
task_address + async_offsets->asyncio_task_object.task_coro,
&coro_addr);
if (err) {
goto err;
}
if ((void*)coro_addr != NULL) {
err = parse_coro_chain(
handle,
offsets,
async_offsets,
coro_addr,
call_stack
);
if (err) {
goto err;
}
if (PyList_Reverse(call_stack)) {
goto err;
}
}
}
if (PyList_Append(render_to, result)) {
goto err;
}
if (recurse_task) {
PyObject *awaited_by = PyList_New(0);
if (awaited_by == NULL) {
goto err;
}
if (PyList_Append(result, awaited_by)) {
Py_DECREF(awaited_by);
goto err;
}
/* we can operate on a borrowed one to simplify cleanup */
Py_DECREF(awaited_by);
if (parse_task_awaited_by(handle, offsets, async_offsets,
task_address, awaited_by, 1)
) {
goto err;
}
}
Py_DECREF(result);
return 0;
err:
Py_DECREF(result);
return -1;
}
static int
parse_tasks_in_set(
proc_handle_t *handle,
struct _Py_DebugOffsets* offsets,
struct _Py_AsyncioModuleDebugOffsets* async_offsets,
uintptr_t set_addr,
PyObject *awaited_by,
int recurse_task
) {
uintptr_t set_obj;
if (read_py_ptr(
handle,
set_addr,
&set_obj)
) {
return -1;
}
Py_ssize_t num_els;
if (read_Py_ssize_t(
handle,
set_obj + offsets->set_object.used,
&num_els)
) {
return -1;
}
Py_ssize_t set_len;
if (read_Py_ssize_t(
handle,
set_obj + offsets->set_object.mask,
&set_len)
) {
return -1;
}
set_len++; // The set contains the `mask+1` element slots.
uintptr_t table_ptr;
if (read_ptr(
handle,
set_obj + offsets->set_object.table,
&table_ptr)
) {
return -1;
}
Py_ssize_t i = 0;
Py_ssize_t els = 0;
while (i < set_len) {
uintptr_t key_addr;
if (read_py_ptr(handle, table_ptr, &key_addr)) {
return -1;
}
if ((void*)key_addr != NULL) {
Py_ssize_t ref_cnt;
if (read_Py_ssize_t(handle, table_ptr, &ref_cnt)) {
return -1;
}
if (ref_cnt) {
// if 'ref_cnt=0' it's a set dummy marker
if (parse_task(
handle,
offsets,
async_offsets,
key_addr,
awaited_by,
recurse_task
)
) {
return -1;
}
if (++els == num_els) {
break;
}
}
}
table_ptr += sizeof(void*) * 2;
i++;
}
return 0;
}
static int
parse_task_awaited_by(
proc_handle_t *handle,
struct _Py_DebugOffsets* offsets,
struct _Py_AsyncioModuleDebugOffsets* async_offsets,
uintptr_t task_address,
PyObject *awaited_by,
int recurse_task
) {
uintptr_t task_ab_addr;
int err = read_py_ptr(
handle,
task_address + async_offsets->asyncio_task_object.task_awaited_by,
&task_ab_addr);
if (err) {
return -1;
}
if ((void*)task_ab_addr == NULL) {
return 0;
}
char awaited_by_is_a_set;
err = read_char(
handle,
task_address + async_offsets->asyncio_task_object.task_awaited_by_is_set,
&awaited_by_is_a_set);
if (err) {
return -1;
}
if (awaited_by_is_a_set) {
if (parse_tasks_in_set(
handle,
offsets,
async_offsets,
task_address + async_offsets->asyncio_task_object.task_awaited_by,
awaited_by,
recurse_task
)
) {
return -1;
}
} else {
uintptr_t sub_task;
if (read_py_ptr(
handle,
task_address + async_offsets->asyncio_task_object.task_awaited_by,
&sub_task)
) {
return -1;
}
if (parse_task(
handle,
offsets,
async_offsets,
sub_task,
awaited_by,
recurse_task
)
) {
return -1;
}
}
return 0;
}
typedef struct
{
int lineno;
int end_lineno;
int column;
int end_column;
} LocationInfo;
static int
scan_varint(const uint8_t **ptr)
{
unsigned int read = **ptr;
*ptr = *ptr + 1;
unsigned int val = read & 63;
unsigned int shift = 0;
while (read & 64) {
read = **ptr;
*ptr = *ptr + 1;
shift += 6;
val |= (read & 63) << shift;
}
return val;
}
static int
scan_signed_varint(const uint8_t **ptr)
{
unsigned int uval = scan_varint(ptr);
if (uval & 1) {
return -(int)(uval >> 1);
}
else {
return uval >> 1;
}
}
static bool
parse_linetable(const uintptr_t addrq, const char* linetable, int firstlineno, LocationInfo* info)
{
const uint8_t* ptr = (const uint8_t*)(linetable);
uint64_t addr = 0;
info->lineno = firstlineno;
while (*ptr != '\0') {
// See InternalDocs/code_objects.md for where these magic numbers are from
// and for the decoding algorithm.
uint8_t first_byte = *(ptr++);
uint8_t code = (first_byte >> 3) & 15;
size_t length = (first_byte & 7) + 1;
uintptr_t end_addr = addr + length;
switch (code) {
case PY_CODE_LOCATION_INFO_NONE: {
break;
}
case PY_CODE_LOCATION_INFO_LONG: {
int line_delta = scan_signed_varint(&ptr);
info->lineno += line_delta;
info->end_lineno = info->lineno + scan_varint(&ptr);
info->column = scan_varint(&ptr) - 1;
info->end_column = scan_varint(&ptr) - 1;
break;
}
case PY_CODE_LOCATION_INFO_NO_COLUMNS: {
int line_delta = scan_signed_varint(&ptr);
info->lineno += line_delta;
info->column = info->end_column = -1;
break;
}
case PY_CODE_LOCATION_INFO_ONE_LINE0:
case PY_CODE_LOCATION_INFO_ONE_LINE1:
case PY_CODE_LOCATION_INFO_ONE_LINE2: {
int line_delta = code - 10;
info->lineno += line_delta;
info->end_lineno = info->lineno;
info->column = *(ptr++);
info->end_column = *(ptr++);
break;
}
default: {
uint8_t second_byte = *(ptr++);
assert((second_byte & 128) == 0);
info->column = code << 3 | (second_byte >> 4);
info->end_column = info->column + (second_byte & 15);
break;
}
}
if (addr <= addrq && end_addr > addrq) {
return true;
}
addr = end_addr;
}
return false;
}
static int
read_remote_pointer(proc_handle_t *handle, uintptr_t address, uintptr_t *out_ptr, const char *error_message)
{
int bytes_read = _Py_RemoteDebug_ReadRemoteMemory(handle, address, sizeof(void *), out_ptr);
if (bytes_read < 0) {
return -1;
}
if ((void *)(*out_ptr) == NULL) {
PyErr_SetString(PyExc_RuntimeError, error_message);
return -1;
}
return 0;
}
static int
read_instruction_ptr(proc_handle_t *handle, struct _Py_DebugOffsets *offsets,
uintptr_t current_frame, uintptr_t *instruction_ptr)
{
return read_remote_pointer(
handle,
current_frame + offsets->interpreter_frame.instr_ptr,
instruction_ptr,
"No instruction ptr found"
);
}
static int
parse_code_object(proc_handle_t *handle,
PyObject **result,
struct _Py_DebugOffsets *offsets,
uintptr_t address,
uintptr_t current_frame,
uintptr_t *previous_frame)
{
uintptr_t addr_func_name, addr_file_name, addr_linetable, instruction_ptr;
if (read_remote_pointer(handle, address + offsets->code_object.qualname, &addr_func_name, "No function name found") < 0 ||
read_remote_pointer(handle, address + offsets->code_object.filename, &addr_file_name, "No file name found") < 0 ||
read_remote_pointer(handle, address + offsets->code_object.linetable, &addr_linetable, "No linetable found") < 0 ||
read_instruction_ptr(handle, offsets, current_frame, &instruction_ptr) < 0) {
return -1;
}
int firstlineno;
if (_Py_RemoteDebug_ReadRemoteMemory(handle,
address + offsets->code_object.firstlineno,
sizeof(int),
&firstlineno) < 0) {
return -1;
}
PyObject *py_linetable = read_py_bytes(handle, offsets, addr_linetable);
if (!py_linetable) {
return -1;
}
uintptr_t addr_code_adaptive = address + offsets->code_object.co_code_adaptive;
ptrdiff_t addrq = (uint16_t *)instruction_ptr - (uint16_t *)addr_code_adaptive;
LocationInfo info;
parse_linetable(addrq, PyBytes_AS_STRING(py_linetable), firstlineno, &info);
Py_DECREF(py_linetable); // Done with linetable
PyObject *py_line = PyLong_FromLong(info.lineno);
if (!py_line) {
return -1;
}
PyObject *py_func_name = read_py_str(handle, offsets, addr_func_name, 256);
if (!py_func_name) {
Py_DECREF(py_line);
return -1;
}
PyObject *py_file_name = read_py_str(handle, offsets, addr_file_name, 256);
if (!py_file_name) {
Py_DECREF(py_line);
Py_DECREF(py_func_name);
return -1;
}
PyObject *result_tuple = PyTuple_New(3);
if (!result_tuple) {
Py_DECREF(py_line);
Py_DECREF(py_func_name);
Py_DECREF(py_file_name);
return -1;
}
PyTuple_SET_ITEM(result_tuple, 0, py_func_name); // steals ref
PyTuple_SET_ITEM(result_tuple, 1, py_file_name); // steals ref
PyTuple_SET_ITEM(result_tuple, 2, py_line); // steals ref
*result = result_tuple;
return 0;
}
static int
parse_frame_object(
proc_handle_t *handle,
PyObject** result,
struct _Py_DebugOffsets* offsets,
uintptr_t address,
uintptr_t* previous_frame
) {
int err;
Py_ssize_t bytes_read = _Py_RemoteDebug_ReadRemoteMemory(
handle,
address + offsets->interpreter_frame.previous,
sizeof(void*),
previous_frame
);
if (bytes_read < 0) {
return -1;
}
char owner;
if (read_char(handle, address + offsets->interpreter_frame.owner, &owner)) {