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Copy pathinstrumentation.c
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2854 lines (2613 loc) · 91.9 KB
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#include "Python.h"
#include "opcode_ids.h"
#include "pycore_bitutils.h" // _Py_popcount32
#include "pycore_call.h"
#include "pycore_ceval.h" // _PY_EVAL_EVENTS_BITS
#include "pycore_code.h" // _PyCode_Clear_Executors()
#include "pycore_critical_section.h"
#include "pycore_frame.h"
#include "pycore_interp.h"
#include "pycore_long.h"
#include "pycore_modsupport.h" // _PyModule_CreateInitialized()
#include "pycore_namespace.h"
#include "pycore_object.h"
#include "pycore_opcode_metadata.h" // IS_VALID_OPCODE, _PyOpcode_Caches
#include "pycore_pyatomic_ft_wrappers.h" // FT_ATOMIC_STORE_UINTPTR_RELEASE
#include "pycore_pyerrors.h"
#include "pycore_pystate.h" // _PyInterpreterState_GET()
/* Uncomment this to dump debugging output when assertions fail */
// #define INSTRUMENT_DEBUG 1
#if defined(Py_DEBUG) && defined(Py_GIL_DISABLED)
#define ASSERT_WORLD_STOPPED_OR_LOCKED(obj) \
if (!_PyInterpreterState_GET()->stoptheworld.world_stopped) { \
_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(obj); \
}
#define ASSERT_WORLD_STOPPED() assert(_PyInterpreterState_GET()->stoptheworld.world_stopped);
#else
#define ASSERT_WORLD_STOPPED_OR_LOCKED(obj)
#define ASSERT_WORLD_STOPPED()
#endif
#ifdef Py_GIL_DISABLED
#define LOCK_CODE(code) \
assert(!_PyInterpreterState_GET()->stoptheworld.world_stopped); \
Py_BEGIN_CRITICAL_SECTION(code)
#define UNLOCK_CODE() Py_END_CRITICAL_SECTION()
#define MODIFY_BYTECODE(code, func, ...) \
do { \
PyCodeObject *co = (code); \
for (Py_ssize_t i = 0; i < code->co_tlbc->size; i++) { \
char *bc = co->co_tlbc->entries[i]; \
if (bc == NULL) { \
continue; \
} \
(func)((_Py_CODEUNIT *)bc, __VA_ARGS__); \
} \
} while (0)
#else
#define LOCK_CODE(code)
#define UNLOCK_CODE()
#define MODIFY_BYTECODE(code, func, ...) \
(func)(_PyCode_CODE(code), __VA_ARGS__)
#endif
PyObject _PyInstrumentation_DISABLE = _PyObject_HEAD_INIT(&PyBaseObject_Type);
PyObject _PyInstrumentation_MISSING = _PyObject_HEAD_INIT(&PyBaseObject_Type);
static const int8_t EVENT_FOR_OPCODE[256] = {
[RETURN_VALUE] = PY_MONITORING_EVENT_PY_RETURN,
[INSTRUMENTED_RETURN_VALUE] = PY_MONITORING_EVENT_PY_RETURN,
[CALL] = PY_MONITORING_EVENT_CALL,
[INSTRUMENTED_CALL] = PY_MONITORING_EVENT_CALL,
[CALL_KW] = PY_MONITORING_EVENT_CALL,
[INSTRUMENTED_CALL_KW] = PY_MONITORING_EVENT_CALL,
[CALL_FUNCTION_EX] = PY_MONITORING_EVENT_CALL,
[INSTRUMENTED_CALL_FUNCTION_EX] = PY_MONITORING_EVENT_CALL,
[LOAD_SUPER_ATTR] = PY_MONITORING_EVENT_CALL,
[INSTRUMENTED_LOAD_SUPER_ATTR] = PY_MONITORING_EVENT_CALL,
[RESUME] = -1,
[YIELD_VALUE] = PY_MONITORING_EVENT_PY_YIELD,
[INSTRUMENTED_YIELD_VALUE] = PY_MONITORING_EVENT_PY_YIELD,
[JUMP_FORWARD] = PY_MONITORING_EVENT_JUMP,
[JUMP_BACKWARD] = PY_MONITORING_EVENT_JUMP,
[POP_JUMP_IF_FALSE] = PY_MONITORING_EVENT_BRANCH,
[POP_JUMP_IF_TRUE] = PY_MONITORING_EVENT_BRANCH,
[POP_JUMP_IF_NONE] = PY_MONITORING_EVENT_BRANCH,
[POP_JUMP_IF_NOT_NONE] = PY_MONITORING_EVENT_BRANCH,
[INSTRUMENTED_JUMP_FORWARD] = PY_MONITORING_EVENT_JUMP,
[INSTRUMENTED_JUMP_BACKWARD] = PY_MONITORING_EVENT_JUMP,
[INSTRUMENTED_POP_JUMP_IF_FALSE] = PY_MONITORING_EVENT_BRANCH,
[INSTRUMENTED_POP_JUMP_IF_TRUE] = PY_MONITORING_EVENT_BRANCH,
[INSTRUMENTED_POP_JUMP_IF_NONE] = PY_MONITORING_EVENT_BRANCH,
[INSTRUMENTED_POP_JUMP_IF_NOT_NONE] = PY_MONITORING_EVENT_BRANCH,
[FOR_ITER] = PY_MONITORING_EVENT_BRANCH,
[INSTRUMENTED_FOR_ITER] = PY_MONITORING_EVENT_BRANCH,
[END_FOR] = PY_MONITORING_EVENT_STOP_ITERATION,
[INSTRUMENTED_END_FOR] = PY_MONITORING_EVENT_STOP_ITERATION,
[END_SEND] = PY_MONITORING_EVENT_STOP_ITERATION,
[INSTRUMENTED_END_SEND] = PY_MONITORING_EVENT_STOP_ITERATION,
};
static const uint8_t DE_INSTRUMENT[256] = {
[INSTRUMENTED_RESUME] = RESUME,
[INSTRUMENTED_RETURN_VALUE] = RETURN_VALUE,
[INSTRUMENTED_CALL] = CALL,
[INSTRUMENTED_CALL_KW] = CALL_KW,
[INSTRUMENTED_CALL_FUNCTION_EX] = CALL_FUNCTION_EX,
[INSTRUMENTED_YIELD_VALUE] = YIELD_VALUE,
[INSTRUMENTED_JUMP_FORWARD] = JUMP_FORWARD,
[INSTRUMENTED_JUMP_BACKWARD] = JUMP_BACKWARD,
[INSTRUMENTED_POP_JUMP_IF_FALSE] = POP_JUMP_IF_FALSE,
[INSTRUMENTED_POP_JUMP_IF_TRUE] = POP_JUMP_IF_TRUE,
[INSTRUMENTED_POP_JUMP_IF_NONE] = POP_JUMP_IF_NONE,
[INSTRUMENTED_POP_JUMP_IF_NOT_NONE] = POP_JUMP_IF_NOT_NONE,
[INSTRUMENTED_FOR_ITER] = FOR_ITER,
[INSTRUMENTED_END_FOR] = END_FOR,
[INSTRUMENTED_END_SEND] = END_SEND,
[INSTRUMENTED_LOAD_SUPER_ATTR] = LOAD_SUPER_ATTR,
};
static const uint8_t INSTRUMENTED_OPCODES[256] = {
[RETURN_VALUE] = INSTRUMENTED_RETURN_VALUE,
[INSTRUMENTED_RETURN_VALUE] = INSTRUMENTED_RETURN_VALUE,
[CALL] = INSTRUMENTED_CALL,
[INSTRUMENTED_CALL] = INSTRUMENTED_CALL,
[CALL_KW] = INSTRUMENTED_CALL_KW,
[INSTRUMENTED_CALL_KW] = INSTRUMENTED_CALL_KW,
[CALL_FUNCTION_EX] = INSTRUMENTED_CALL_FUNCTION_EX,
[INSTRUMENTED_CALL_FUNCTION_EX] = INSTRUMENTED_CALL_FUNCTION_EX,
[YIELD_VALUE] = INSTRUMENTED_YIELD_VALUE,
[INSTRUMENTED_YIELD_VALUE] = INSTRUMENTED_YIELD_VALUE,
[RESUME] = INSTRUMENTED_RESUME,
[INSTRUMENTED_RESUME] = INSTRUMENTED_RESUME,
[JUMP_FORWARD] = INSTRUMENTED_JUMP_FORWARD,
[INSTRUMENTED_JUMP_FORWARD] = INSTRUMENTED_JUMP_FORWARD,
[JUMP_BACKWARD] = INSTRUMENTED_JUMP_BACKWARD,
[INSTRUMENTED_JUMP_BACKWARD] = INSTRUMENTED_JUMP_BACKWARD,
[POP_JUMP_IF_FALSE] = INSTRUMENTED_POP_JUMP_IF_FALSE,
[INSTRUMENTED_POP_JUMP_IF_FALSE] = INSTRUMENTED_POP_JUMP_IF_FALSE,
[POP_JUMP_IF_TRUE] = INSTRUMENTED_POP_JUMP_IF_TRUE,
[INSTRUMENTED_POP_JUMP_IF_TRUE] = INSTRUMENTED_POP_JUMP_IF_TRUE,
[POP_JUMP_IF_NONE] = INSTRUMENTED_POP_JUMP_IF_NONE,
[INSTRUMENTED_POP_JUMP_IF_NONE] = INSTRUMENTED_POP_JUMP_IF_NONE,
[POP_JUMP_IF_NOT_NONE] = INSTRUMENTED_POP_JUMP_IF_NOT_NONE,
[INSTRUMENTED_POP_JUMP_IF_NOT_NONE] = INSTRUMENTED_POP_JUMP_IF_NOT_NONE,
[END_FOR] = INSTRUMENTED_END_FOR,
[INSTRUMENTED_END_FOR] = INSTRUMENTED_END_FOR,
[END_SEND] = INSTRUMENTED_END_SEND,
[INSTRUMENTED_END_SEND] = INSTRUMENTED_END_SEND,
[FOR_ITER] = INSTRUMENTED_FOR_ITER,
[INSTRUMENTED_FOR_ITER] = INSTRUMENTED_FOR_ITER,
[LOAD_SUPER_ATTR] = INSTRUMENTED_LOAD_SUPER_ATTR,
[INSTRUMENTED_LOAD_SUPER_ATTR] = INSTRUMENTED_LOAD_SUPER_ATTR,
[INSTRUMENTED_LINE] = INSTRUMENTED_LINE,
[INSTRUMENTED_INSTRUCTION] = INSTRUMENTED_INSTRUCTION,
};
static inline bool
opcode_has_event(int opcode)
{
return (
opcode != INSTRUMENTED_LINE &&
INSTRUMENTED_OPCODES[opcode] > 0
);
}
static inline bool
is_instrumented(int opcode)
{
assert(opcode != 0);
assert(opcode != RESERVED);
assert(opcode != ENTER_EXECUTOR);
return opcode >= MIN_INSTRUMENTED_OPCODE;
}
#ifndef NDEBUG
static inline bool
monitors_equals(_Py_LocalMonitors a, _Py_LocalMonitors b)
{
for (int i = 0; i < _PY_MONITORING_LOCAL_EVENTS; i++) {
if (a.tools[i] != b.tools[i]) {
return false;
}
}
return true;
}
#endif
static inline _Py_LocalMonitors
monitors_sub(_Py_LocalMonitors a, _Py_LocalMonitors b)
{
_Py_LocalMonitors res;
for (int i = 0; i < _PY_MONITORING_LOCAL_EVENTS; i++) {
res.tools[i] = a.tools[i] & ~b.tools[i];
}
return res;
}
#ifndef NDEBUG
static inline _Py_LocalMonitors
monitors_and(_Py_LocalMonitors a, _Py_LocalMonitors b)
{
_Py_LocalMonitors res;
for (int i = 0; i < _PY_MONITORING_LOCAL_EVENTS; i++) {
res.tools[i] = a.tools[i] & b.tools[i];
}
return res;
}
#endif
/* The union of the *local* events in a and b.
* Global events like RAISE are ignored.
* Used for instrumentation, as only local
* events get instrumented.
*/
static inline _Py_LocalMonitors
local_union(_Py_GlobalMonitors a, _Py_LocalMonitors b)
{
_Py_LocalMonitors res;
for (int i = 0; i < _PY_MONITORING_LOCAL_EVENTS; i++) {
res.tools[i] = a.tools[i] | b.tools[i];
}
return res;
}
static inline bool
monitors_are_empty(_Py_LocalMonitors m)
{
for (int i = 0; i < _PY_MONITORING_LOCAL_EVENTS; i++) {
if (m.tools[i]) {
return false;
}
}
return true;
}
static inline bool
multiple_tools(_Py_LocalMonitors *m)
{
for (int i = 0; i < _PY_MONITORING_LOCAL_EVENTS; i++) {
if (_Py_popcount32(m->tools[i]) > 1) {
return true;
}
}
return false;
}
static inline _PyMonitoringEventSet
get_local_events(_Py_LocalMonitors *m, int tool_id)
{
_PyMonitoringEventSet result = 0;
for (int e = 0; e < _PY_MONITORING_LOCAL_EVENTS; e++) {
if ((m->tools[e] >> tool_id) & 1) {
result |= (1 << e);
}
}
return result;
}
static inline _PyMonitoringEventSet
get_events(_Py_GlobalMonitors *m, int tool_id)
{
_PyMonitoringEventSet result = 0;
for (int e = 0; e < _PY_MONITORING_UNGROUPED_EVENTS; e++) {
if ((m->tools[e] >> tool_id) & 1) {
result |= (1 << e);
}
}
return result;
}
/* Line delta.
* 8 bit value.
* if line_delta == -128:
* line = None # represented as -1
* elif line_delta == -127 or line_delta == -126:
* line = PyCode_Addr2Line(code, offset * sizeof(_Py_CODEUNIT));
* else:
* line = first_line + (offset >> OFFSET_SHIFT) + line_delta;
*/
#define NO_LINE -128
#define COMPUTED_LINE_LINENO_CHANGE -127
#define COMPUTED_LINE -126
#define OFFSET_SHIFT 4
static int8_t
compute_line_delta(PyCodeObject *code, int offset, int line)
{
if (line < 0) {
return NO_LINE;
}
int delta = line - code->co_firstlineno - (offset >> OFFSET_SHIFT);
if (delta <= INT8_MAX && delta > COMPUTED_LINE) {
return delta;
}
return COMPUTED_LINE;
}
static int
compute_line(PyCodeObject *code, int offset, int8_t line_delta)
{
if (line_delta > COMPUTED_LINE) {
return code->co_firstlineno + (offset >> OFFSET_SHIFT) + line_delta;
}
if (line_delta == NO_LINE) {
return -1;
}
assert(line_delta == COMPUTED_LINE || line_delta == COMPUTED_LINE_LINENO_CHANGE);
/* Look it up */
return PyCode_Addr2Line(code, offset * sizeof(_Py_CODEUNIT));
}
int
_PyInstruction_GetLength(PyCodeObject *code, int offset)
{
ASSERT_WORLD_STOPPED_OR_LOCKED(code);
int opcode =
FT_ATOMIC_LOAD_UINT8_RELAXED(_PyCode_CODE(code)[offset].op.code);
assert(opcode != 0);
assert(opcode != RESERVED);
if (opcode == INSTRUMENTED_LINE) {
opcode = code->_co_monitoring->lines[offset].original_opcode;
}
if (opcode == INSTRUMENTED_INSTRUCTION) {
opcode = code->_co_monitoring->per_instruction_opcodes[offset];
}
int deinstrumented = DE_INSTRUMENT[opcode];
if (deinstrumented) {
opcode = deinstrumented;
}
else {
opcode = _PyOpcode_Deopt[opcode];
}
assert(opcode != 0);
if (opcode == ENTER_EXECUTOR) {
int exec_index = _PyCode_CODE(code)[offset].op.arg;
_PyExecutorObject *exec = code->co_executors->executors[exec_index];
opcode = _PyOpcode_Deopt[exec->vm_data.opcode];
}
assert(!is_instrumented(opcode));
assert(opcode != ENTER_EXECUTOR);
assert(opcode == _PyOpcode_Deopt[opcode]);
return 1 + _PyOpcode_Caches[opcode];
}
#ifdef INSTRUMENT_DEBUG
static void
dump_instrumentation_data_tools(PyCodeObject *code, uint8_t *tools, int i, FILE*out)
{
if (tools == NULL) {
fprintf(out, "tools = NULL");
}
else {
fprintf(out, "tools = %d", tools[i]);
}
}
static void
dump_instrumentation_data_lines(PyCodeObject *code, _PyCoLineInstrumentationData *lines, int i, FILE*out)
{
if (lines == NULL) {
fprintf(out, ", lines = NULL");
}
else if (lines[i].original_opcode == 0) {
fprintf(out, ", lines = {original_opcode = No LINE (0), line_delta = %d)", lines[i].line_delta);
}
else {
fprintf(out, ", lines = {original_opcode = %s, line_delta = %d)", _PyOpcode_OpName[lines[i].original_opcode], lines[i].line_delta);
}
}
static void
dump_instrumentation_data_line_tools(PyCodeObject *code, uint8_t *line_tools, int i, FILE*out)
{
if (line_tools == NULL) {
fprintf(out, ", line_tools = NULL");
}
else {
fprintf(out, ", line_tools = %d", line_tools[i]);
}
}
static void
dump_instrumentation_data_per_instruction(PyCodeObject *code, _PyCoMonitoringData *data, int i, FILE*out)
{
if (data->per_instruction_opcodes == NULL) {
fprintf(out, ", per-inst opcode = NULL");
}
else {
fprintf(out, ", per-inst opcode = %s", _PyOpcode_OpName[data->per_instruction_opcodes[i]]);
}
if (data->per_instruction_tools == NULL) {
fprintf(out, ", per-inst tools = NULL");
}
else {
fprintf(out, ", per-inst tools = %d", data->per_instruction_tools[i]);
}
}
static void
dump_global_monitors(const char *prefix, _Py_GlobalMonitors monitors, FILE*out)
{
fprintf(out, "%s monitors:\n", prefix);
for (int event = 0; event < _PY_MONITORING_UNGROUPED_EVENTS; event++) {
fprintf(out, " Event %d: Tools %x\n", event, monitors.tools[event]);
}
}
static void
dump_local_monitors(const char *prefix, _Py_LocalMonitors monitors, FILE*out)
{
fprintf(out, "%s monitors:\n", prefix);
for (int event = 0; event < _PY_MONITORING_LOCAL_EVENTS; event++) {
fprintf(out, " Event %d: Tools %x\n", event, monitors.tools[event]);
}
}
/* No error checking -- Don't use this for anything but experimental debugging */
static void
dump_instrumentation_data(PyCodeObject *code, int star, FILE*out)
{
_PyCoMonitoringData *data = code->_co_monitoring;
fprintf(out, "\n");
PyObject_Print(code->co_name, out, Py_PRINT_RAW);
fprintf(out, "\n");
if (data == NULL) {
fprintf(out, "NULL\n");
return;
}
dump_global_monitors("Global", _PyInterpreterState_GET()->monitors, out);
dump_local_monitors("Code", data->local_monitors, out);
dump_local_monitors("Active", data->active_monitors, out);
int code_len = (int)Py_SIZE(code);
bool starred = false;
for (int i = 0; i < code_len; i += _PyInstruction_GetLength(code, i)) {
_Py_CODEUNIT *instr = &_PyCode_CODE(code)[i];
int opcode = instr->op.code;
if (i == star) {
fprintf(out, "** ");
starred = true;
}
fprintf(out, "Offset: %d, line: %d %s: ", i, PyCode_Addr2Line(code, i*2), _PyOpcode_OpName[opcode]);
dump_instrumentation_data_tools(code, data->tools, i, out);
dump_instrumentation_data_lines(code, data->lines, i, out);
dump_instrumentation_data_line_tools(code, data->line_tools, i, out);
dump_instrumentation_data_per_instruction(code, data, i, out);
fprintf(out, "\n");
;
}
if (!starred && star >= 0) {
fprintf(out, "Error offset not at valid instruction offset: %d\n", star);
fprintf(out, " ");
dump_instrumentation_data_tools(code, data->tools, star, out);
dump_instrumentation_data_lines(code, data->lines, star, out);
dump_instrumentation_data_line_tools(code, data->line_tools, star, out);
dump_instrumentation_data_per_instruction(code, data, star, out);
fprintf(out, "\n");
}
}
#define CHECK(test) do { \
if (!(test)) { \
dump_instrumentation_data(code, i, stderr); \
} \
assert(test); \
} while (0)
static bool
valid_opcode(int opcode)
{
if (opcode == INSTRUMENTED_LINE) {
return true;
}
if (IS_VALID_OPCODE(opcode) &&
opcode != CACHE &&
opcode != RESERVED &&
opcode < 255)
{
return true;
}
return false;
}
static void
sanity_check_instrumentation(PyCodeObject *code)
{
ASSERT_WORLD_STOPPED_OR_LOCKED(code);
_PyCoMonitoringData *data = code->_co_monitoring;
if (data == NULL) {
return;
}
_Py_GlobalMonitors global_monitors = _PyInterpreterState_GET()->monitors;
_Py_LocalMonitors active_monitors;
if (code->_co_monitoring) {
_Py_LocalMonitors local_monitors = code->_co_monitoring->local_monitors;
active_monitors = local_union(global_monitors, local_monitors);
}
else {
_Py_LocalMonitors empty = (_Py_LocalMonitors) { 0 };
active_monitors = local_union(global_monitors, empty);
}
assert(monitors_equals(
code->_co_monitoring->active_monitors,
active_monitors));
int code_len = (int)Py_SIZE(code);
for (int i = 0; i < code_len;) {
_Py_CODEUNIT *instr = &_PyCode_CODE(code)[i];
int opcode = instr->op.code;
int base_opcode = _Py_GetBaseCodeUnit(code, offset).op.code;
CHECK(valid_opcode(opcode));
CHECK(valid_opcode(base_opcode));
if (opcode == INSTRUMENTED_INSTRUCTION) {
opcode = data->per_instruction_opcodes[i];
if (!is_instrumented(opcode)) {
CHECK(_PyOpcode_Deopt[opcode] == opcode);
}
}
if (opcode == INSTRUMENTED_LINE) {
CHECK(data->lines);
CHECK(valid_opcode(data->lines[i].original_opcode));
opcode = data->lines[i].original_opcode;
CHECK(opcode != END_FOR);
CHECK(opcode != RESUME);
CHECK(opcode != RESUME_CHECK);
CHECK(opcode != INSTRUMENTED_RESUME);
if (!is_instrumented(opcode)) {
CHECK(_PyOpcode_Deopt[opcode] == opcode);
}
CHECK(opcode != INSTRUMENTED_LINE);
}
else if (data->lines) {
/* If original_opcode is INSTRUMENTED_INSTRUCTION
* *and* we are executing a INSTRUMENTED_LINE instruction
* that has de-instrumented itself, then we will execute
* an invalid INSTRUMENTED_INSTRUCTION */
CHECK(data->lines[i].original_opcode != INSTRUMENTED_INSTRUCTION);
}
if (opcode == INSTRUMENTED_INSTRUCTION) {
CHECK(data->per_instruction_opcodes[i] != 0);
opcode = data->per_instruction_opcodes[i];
}
if (is_instrumented(opcode)) {
CHECK(DE_INSTRUMENT[opcode] == base_opcode);
int event = EVENT_FOR_OPCODE[DE_INSTRUMENT[opcode]];
if (event < 0) {
/* RESUME fixup */
event = instr->op.arg ? 1: 0;
}
CHECK(active_monitors.tools[event] != 0);
}
if (data->lines && base_opcode != END_FOR) {
int line1 = compute_line(code, i, data->lines[i].line_delta);
int line2 = PyCode_Addr2Line(code, i*sizeof(_Py_CODEUNIT));
CHECK(line1 == line2);
}
CHECK(valid_opcode(opcode));
if (data->tools) {
uint8_t local_tools = data->tools[i];
if (opcode_has_event(base_opcode)) {
int event = EVENT_FOR_OPCODE[base_opcode];
if (event == -1) {
/* RESUME fixup */
event = _PyCode_CODE(code)[i].op.arg;
}
CHECK((active_monitors.tools[event] & local_tools) == local_tools);
}
else {
CHECK(local_tools == 0xff);
}
}
i += _PyInstruction_GetLength(code, i);
assert(i <= code_len);
}
}
#else
#define CHECK(test) assert(test)
#endif
/* Get the underlying code unit, stripping instrumentation and ENTER_EXECUTOR */
_Py_CODEUNIT
_Py_GetBaseCodeUnit(PyCodeObject *code, int i)
{
_Py_CODEUNIT *src_instr = _PyCode_CODE(code) + i;
_Py_CODEUNIT inst = {
.cache = FT_ATOMIC_LOAD_UINT16_RELAXED(*(uint16_t *)src_instr)};
int opcode = inst.op.code;
if (opcode < MIN_INSTRUMENTED_OPCODE) {
inst.op.code = _PyOpcode_Deopt[opcode];
assert(inst.op.code <= RESUME);
return inst;
}
if (opcode == ENTER_EXECUTOR) {
_PyExecutorObject *exec = code->co_executors->executors[inst.op.arg];
opcode = _PyOpcode_Deopt[exec->vm_data.opcode];
inst.op.code = opcode;
assert(opcode <= RESUME);
inst.op.arg = exec->vm_data.oparg;
assert(inst.op.code <= RESUME);
return inst;
}
if (opcode == INSTRUMENTED_LINE) {
opcode = code->_co_monitoring->lines[i].original_opcode;
}
if (opcode == INSTRUMENTED_INSTRUCTION) {
opcode = code->_co_monitoring->per_instruction_opcodes[i];
}
CHECK(opcode != INSTRUMENTED_INSTRUCTION);
CHECK(opcode != INSTRUMENTED_LINE);
int deinstrumented = DE_INSTRUMENT[opcode];
if (deinstrumented) {
inst.op.code = deinstrumented;
}
else {
inst.op.code = _PyOpcode_Deopt[opcode];
}
assert(inst.op.code < MIN_SPECIALIZED_OPCODE);
return inst;
}
static void
de_instrument(_Py_CODEUNIT *bytecode, _PyCoMonitoringData *monitoring, int i,
int event)
{
assert(event != PY_MONITORING_EVENT_INSTRUCTION);
assert(event != PY_MONITORING_EVENT_LINE);
_Py_CODEUNIT *instr = &bytecode[i];
uint8_t *opcode_ptr = &instr->op.code;
int opcode = *opcode_ptr;
assert(opcode != ENTER_EXECUTOR);
if (opcode == INSTRUMENTED_LINE) {
opcode_ptr = &monitoring->lines[i].original_opcode;
opcode = *opcode_ptr;
}
if (opcode == INSTRUMENTED_INSTRUCTION) {
opcode_ptr = &monitoring->per_instruction_opcodes[i];
opcode = *opcode_ptr;
}
int deinstrumented = DE_INSTRUMENT[opcode];
if (deinstrumented == 0) {
return;
}
CHECK(_PyOpcode_Deopt[deinstrumented] == deinstrumented);
FT_ATOMIC_STORE_UINT8_RELAXED(*opcode_ptr, deinstrumented);
if (_PyOpcode_Caches[deinstrumented]) {
FT_ATOMIC_STORE_UINT16_RELAXED(instr[1].counter.value_and_backoff,
adaptive_counter_warmup().value_and_backoff);
}
}
static void
de_instrument_line(_Py_CODEUNIT *bytecode, _PyCoMonitoringData *monitoring,
int i)
{
_Py_CODEUNIT *instr = &bytecode[i];
int opcode = instr->op.code;
if (opcode != INSTRUMENTED_LINE) {
return;
}
_PyCoLineInstrumentationData *lines = &monitoring->lines[i];
int original_opcode = lines->original_opcode;
if (original_opcode == INSTRUMENTED_INSTRUCTION) {
lines->original_opcode = monitoring->per_instruction_opcodes[i];
}
CHECK(original_opcode != 0);
CHECK(original_opcode == _PyOpcode_Deopt[original_opcode]);
FT_ATOMIC_STORE_UINT8(instr->op.code, original_opcode);
if (_PyOpcode_Caches[original_opcode]) {
FT_ATOMIC_STORE_UINT16_RELAXED(instr[1].counter.value_and_backoff,
adaptive_counter_warmup().value_and_backoff);
}
assert(instr->op.code != INSTRUMENTED_LINE);
}
static void
de_instrument_per_instruction(_Py_CODEUNIT *bytecode,
_PyCoMonitoringData *monitoring, int i)
{
_Py_CODEUNIT *instr = &bytecode[i];
uint8_t *opcode_ptr = &instr->op.code;
int opcode = *opcode_ptr;
if (opcode == INSTRUMENTED_LINE) {
opcode_ptr = &monitoring->lines[i].original_opcode;
opcode = *opcode_ptr;
}
if (opcode != INSTRUMENTED_INSTRUCTION) {
return;
}
int original_opcode = monitoring->per_instruction_opcodes[i];
CHECK(original_opcode != 0);
CHECK(original_opcode == _PyOpcode_Deopt[original_opcode]);
FT_ATOMIC_STORE_UINT8_RELAXED(*opcode_ptr, original_opcode);
if (_PyOpcode_Caches[original_opcode]) {
FT_ATOMIC_STORE_UINT16_RELAXED(instr[1].counter.value_and_backoff,
adaptive_counter_warmup().value_and_backoff);
}
assert(*opcode_ptr != INSTRUMENTED_INSTRUCTION);
assert(instr->op.code != INSTRUMENTED_INSTRUCTION);
}
static void
instrument(_Py_CODEUNIT *bytecode, _PyCoMonitoringData *monitoring, int i)
{
_Py_CODEUNIT *instr = &bytecode[i];
uint8_t *opcode_ptr = &instr->op.code;
int opcode =*opcode_ptr;
if (opcode == INSTRUMENTED_LINE) {
_PyCoLineInstrumentationData *lines = &monitoring->lines[i];
opcode_ptr = &lines->original_opcode;
opcode = *opcode_ptr;
}
if (opcode == INSTRUMENTED_INSTRUCTION) {
opcode_ptr = &monitoring->per_instruction_opcodes[i];
opcode = *opcode_ptr;
CHECK(opcode != INSTRUMENTED_INSTRUCTION && opcode != INSTRUMENTED_LINE);
CHECK(opcode == _PyOpcode_Deopt[opcode]);
}
CHECK(opcode != 0);
if (!is_instrumented(opcode)) {
int deopt = _PyOpcode_Deopt[opcode];
int instrumented = INSTRUMENTED_OPCODES[deopt];
assert(instrumented);
FT_ATOMIC_STORE_UINT8_RELAXED(*opcode_ptr, instrumented);
if (_PyOpcode_Caches[deopt]) {
FT_ATOMIC_STORE_UINT16_RELAXED(instr[1].counter.value_and_backoff,
adaptive_counter_warmup().value_and_backoff);
}
}
}
static void
instrument_line(_Py_CODEUNIT *bytecode, _PyCoMonitoringData *monitoring, int i)
{
uint8_t *opcode_ptr = &bytecode[i].op.code;
int opcode = *opcode_ptr;
if (opcode == INSTRUMENTED_LINE) {
return;
}
_PyCoLineInstrumentationData *lines = &monitoring->lines[i];
lines->original_opcode = _PyOpcode_Deopt[opcode];
CHECK(lines->original_opcode > 0);
FT_ATOMIC_STORE_UINT8_RELAXED(*opcode_ptr, INSTRUMENTED_LINE);
}
static void
instrument_per_instruction(_Py_CODEUNIT *bytecode,
_PyCoMonitoringData *monitoring, int i)
{
_Py_CODEUNIT *instr = &bytecode[i];
uint8_t *opcode_ptr = &instr->op.code;
int opcode = *opcode_ptr;
if (opcode == INSTRUMENTED_LINE) {
_PyCoLineInstrumentationData *lines = &monitoring->lines[i];
opcode_ptr = &lines->original_opcode;
opcode = *opcode_ptr;
}
if (opcode == INSTRUMENTED_INSTRUCTION) {
assert(monitoring->per_instruction_opcodes[i] > 0);
return;
}
CHECK(opcode != 0);
if (is_instrumented(opcode)) {
monitoring->per_instruction_opcodes[i] = opcode;
}
else {
assert(opcode != 0);
assert(_PyOpcode_Deopt[opcode] != 0);
assert(_PyOpcode_Deopt[opcode] != RESUME);
monitoring->per_instruction_opcodes[i] = _PyOpcode_Deopt[opcode];
}
assert(monitoring->per_instruction_opcodes[i] > 0);
FT_ATOMIC_STORE_UINT8_RELAXED(*opcode_ptr, INSTRUMENTED_INSTRUCTION);
}
static void
remove_tools(PyCodeObject * code, int offset, int event, int tools)
{
ASSERT_WORLD_STOPPED_OR_LOCKED(code);
assert(event != PY_MONITORING_EVENT_LINE);
assert(event != PY_MONITORING_EVENT_INSTRUCTION);
assert(PY_MONITORING_IS_INSTRUMENTED_EVENT(event));
assert(opcode_has_event(_Py_GetBaseCodeUnit(code, offset).op.code));
_PyCoMonitoringData *monitoring = code->_co_monitoring;
bool should_de_instrument;
if (monitoring && monitoring->tools) {
monitoring->tools[offset] &= ~tools;
should_de_instrument = (monitoring->tools[offset] == 0);
}
else {
/* Single tool */
uint8_t single_tool = code->_co_monitoring->active_monitors.tools[event];
assert(_Py_popcount32(single_tool) <= 1);
should_de_instrument = ((single_tool & tools) == single_tool);
}
if (should_de_instrument) {
MODIFY_BYTECODE(code, de_instrument, monitoring, offset, event);
}
}
#ifndef NDEBUG
static bool
tools_is_subset_for_event(PyCodeObject * code, int event, int tools)
{
int global_tools = _PyInterpreterState_GET()->monitors.tools[event];
int local_tools = code->_co_monitoring->local_monitors.tools[event];
return tools == ((global_tools | local_tools) & tools);
}
#endif
static void
remove_line_tools(PyCodeObject * code, int offset, int tools)
{
ASSERT_WORLD_STOPPED_OR_LOCKED(code);
_PyCoMonitoringData *monitoring = code->_co_monitoring;
assert(monitoring);
bool should_de_instrument;
if (monitoring->line_tools)
{
uint8_t *toolsptr = &monitoring->line_tools[offset];
*toolsptr &= ~tools;
should_de_instrument = (*toolsptr == 0);
}
else {
/* Single tool */
uint8_t single_tool = monitoring->active_monitors.tools[PY_MONITORING_EVENT_LINE];
assert(_Py_popcount32(single_tool) <= 1);
should_de_instrument = ((single_tool & tools) == single_tool);
}
if (should_de_instrument) {
MODIFY_BYTECODE(code, de_instrument_line, monitoring, offset);
}
}
static void
add_tools(PyCodeObject * code, int offset, int event, int tools)
{
ASSERT_WORLD_STOPPED_OR_LOCKED(code);
assert(event != PY_MONITORING_EVENT_LINE);
assert(event != PY_MONITORING_EVENT_INSTRUCTION);
assert(PY_MONITORING_IS_INSTRUMENTED_EVENT(event));
assert(code->_co_monitoring);
if (code->_co_monitoring &&
code->_co_monitoring->tools
) {
code->_co_monitoring->tools[offset] |= tools;
}
else {
/* Single tool */
assert(_Py_popcount32(tools) == 1);
assert(tools_is_subset_for_event(code, event, tools));
}
MODIFY_BYTECODE(code, instrument, code->_co_monitoring, offset);
}
static void
add_line_tools(PyCodeObject * code, int offset, int tools)
{
ASSERT_WORLD_STOPPED_OR_LOCKED(code);
assert(tools_is_subset_for_event(code, PY_MONITORING_EVENT_LINE, tools));
assert(code->_co_monitoring);
if (code->_co_monitoring->line_tools) {
code->_co_monitoring->line_tools[offset] |= tools;
}
else {
/* Single tool */
assert(_Py_popcount32(tools) == 1);
}
MODIFY_BYTECODE(code, instrument_line, code->_co_monitoring, offset);
}
static void
add_per_instruction_tools(PyCodeObject * code, int offset, int tools)
{
ASSERT_WORLD_STOPPED_OR_LOCKED(code);
assert(tools_is_subset_for_event(code, PY_MONITORING_EVENT_INSTRUCTION, tools));
assert(code->_co_monitoring);
if (code->_co_monitoring->per_instruction_tools) {
code->_co_monitoring->per_instruction_tools[offset] |= tools;
}
else {
/* Single tool */
assert(_Py_popcount32(tools) == 1);
}
MODIFY_BYTECODE(code, instrument_per_instruction, code->_co_monitoring, offset);
}
static void
remove_per_instruction_tools(PyCodeObject * code, int offset, int tools)
{
ASSERT_WORLD_STOPPED_OR_LOCKED(code);
_PyCoMonitoringData *monitoring = code->_co_monitoring;
assert(code->_co_monitoring);
bool should_de_instrument;
if (code->_co_monitoring->per_instruction_tools) {
uint8_t *toolsptr = &code->_co_monitoring->per_instruction_tools[offset];
*toolsptr &= ~tools;
should_de_instrument = (*toolsptr == 0);
}
else {
/* Single tool */
uint8_t single_tool = code->_co_monitoring->active_monitors.tools[PY_MONITORING_EVENT_INSTRUCTION];
assert(_Py_popcount32(single_tool) <= 1);
should_de_instrument = ((single_tool & tools) == single_tool);
}
if (should_de_instrument) {
MODIFY_BYTECODE(code, de_instrument_per_instruction, monitoring, offset);
}
}
/* Return 1 if DISABLE returned, -1 if error, 0 otherwise */
static int
call_one_instrument(
PyInterpreterState *interp, PyThreadState *tstate, PyObject **args,
size_t nargsf, int8_t tool, int event)
{
assert(0 <= tool && tool < 8);
assert(tstate->tracing == 0);
PyObject *instrument = interp->monitoring_callables[tool][event];
if (instrument == NULL) {
return 0;
}
int old_what = tstate->what_event;
tstate->what_event = event;
tstate->tracing++;
PyObject *res = _PyObject_VectorcallTstate(tstate, instrument, args, nargsf, NULL);
tstate->tracing--;
tstate->what_event = old_what;
if (res == NULL) {
return -1;
}
Py_DECREF(res);
return (res == &_PyInstrumentation_DISABLE);
}
static const int8_t MOST_SIGNIFICANT_BITS[16] = {
-1, 0, 1, 1,
2, 2, 2, 2,
3, 3, 3, 3,
3, 3, 3, 3,
};
/* We could use _Py_bit_length here, but that is designed for larger (32/64)
* bit ints, and can perform relatively poorly on platforms without the
* necessary intrinsics. */
static inline int most_significant_bit(uint8_t bits) {
assert(bits != 0);
if (bits > 15) {
return MOST_SIGNIFICANT_BITS[bits>>4]+4;
}
return MOST_SIGNIFICANT_BITS[bits];
}
static uint32_t
global_version(PyInterpreterState *interp)
{
uint32_t version = (uint32_t)_Py_atomic_load_uintptr_relaxed(
&interp->ceval.instrumentation_version);
#ifdef Py_DEBUG
PyThreadState *tstate = _PyThreadState_GET();
uint32_t thread_version =
(uint32_t)(_Py_atomic_load_uintptr_relaxed(&tstate->eval_breaker) &
~_PY_EVAL_EVENTS_MASK);
assert(thread_version == version);
#endif
return version;
}
/* Atomically set the given version in the given location, without touching
anything in _PY_EVAL_EVENTS_MASK. */
static void
set_version_raw(uintptr_t *ptr, uint32_t version)
{
uintptr_t old = _Py_atomic_load_uintptr_relaxed(ptr);
uintptr_t new;
do {
new = (old & _PY_EVAL_EVENTS_MASK) | version;
} while (!_Py_atomic_compare_exchange_uintptr(ptr, &old, new));
}
static void