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Copy pathframeobject.c
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1479 lines (1366 loc) · 45 KB
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/* Frame object implementation */
#include "Python.h"
#include "pycore_ceval.h" // _PyEval_BuiltinsFromGlobals()
#include "pycore_code.h" // CO_FAST_LOCAL, etc.
#include "pycore_function.h" // _PyFunction_FromConstructor()
#include "pycore_moduleobject.h" // _PyModule_GetDict()
#include "pycore_object.h" // _PyObject_GC_UNTRACK()
#include "pycore_opcode.h" // _PyOpcode_Caches
#include "frameobject.h" // PyFrameObject
#include "pycore_frame.h"
#include "opcode.h" // EXTENDED_ARG
#include "structmember.h" // PyMemberDef
#define OFF(x) offsetof(PyFrameObject, x)
static PyMemberDef frame_memberlist[] = {
{"f_trace_lines", T_BOOL, OFF(f_trace_lines), 0},
{"f_trace_opcodes", T_BOOL, OFF(f_trace_opcodes), 0},
{NULL} /* Sentinel */
};
static PyObject *
frame_getlocals(PyFrameObject *f, void *closure)
{
if (PyFrame_FastToLocalsWithError(f) < 0)
return NULL;
PyObject *locals = f->f_frame->f_locals;
return Py_NewRef(locals);
}
int
PyFrame_GetLineNumber(PyFrameObject *f)
{
assert(f != NULL);
if (f->f_lineno != 0) {
return f->f_lineno;
}
else {
return _PyInterpreterFrame_GetLine(f->f_frame);
}
}
static PyObject *
frame_getlineno(PyFrameObject *f, void *closure)
{
int lineno = PyFrame_GetLineNumber(f);
if (lineno < 0) {
Py_RETURN_NONE;
}
else {
return PyLong_FromLong(lineno);
}
}
static PyObject *
frame_getlasti(PyFrameObject *f, void *closure)
{
int lasti = _PyInterpreterFrame_LASTI(f->f_frame);
if (lasti < 0) {
return PyLong_FromLong(-1);
}
return PyLong_FromLong(lasti * sizeof(_Py_CODEUNIT));
}
static PyObject *
frame_getglobals(PyFrameObject *f, void *closure)
{
PyObject *globals = f->f_frame->f_globals;
if (globals == NULL) {
globals = Py_None;
}
return Py_NewRef(globals);
}
static PyObject *
frame_getbuiltins(PyFrameObject *f, void *closure)
{
PyObject *builtins = f->f_frame->f_builtins;
if (builtins == NULL) {
builtins = Py_None;
}
return Py_NewRef(builtins);
}
static PyObject *
frame_getcode(PyFrameObject *f, void *closure)
{
if (PySys_Audit("object.__getattr__", "Os", f, "f_code") < 0) {
return NULL;
}
return (PyObject *)PyFrame_GetCode(f);
}
static PyObject *
frame_getback(PyFrameObject *f, void *closure)
{
PyObject *res = (PyObject *)PyFrame_GetBack(f);
if (res == NULL) {
Py_RETURN_NONE;
}
return res;
}
// Given the index of the effective opcode, scan back to construct the oparg
// with EXTENDED_ARG. This only works correctly with *unquickened* code,
// obtained via a call to _PyCode_GetCode!
static unsigned int
get_arg(const _Py_CODEUNIT *codestr, Py_ssize_t i)
{
_Py_CODEUNIT word;
unsigned int oparg = codestr[i].op.arg;
if (i >= 1 && (word = codestr[i-1]).op.code == EXTENDED_ARG) {
oparg |= word.op.arg << 8;
if (i >= 2 && (word = codestr[i-2]).op.code == EXTENDED_ARG) {
oparg |= word.op.arg << 16;
if (i >= 3 && (word = codestr[i-3]).op.code == EXTENDED_ARG) {
oparg |= word.op.arg << 24;
}
}
}
return oparg;
}
/* Model the evaluation stack, to determine which jumps
* are safe and how many values needs to be popped.
* The stack is modelled by a 64 integer, treating any
* stack that can't fit into 64 bits as "overflowed".
*/
typedef enum kind {
Iterator = 1,
Except = 2,
Object = 3,
Null = 4,
Lasti = 5,
} Kind;
static int
compatible_kind(Kind from, Kind to) {
if (to == 0) {
return 0;
}
if (to == Object) {
return from != Null;
}
if (to == Null) {
return 1;
}
return from == to;
}
#define BITS_PER_BLOCK 3
#define UNINITIALIZED -2
#define OVERFLOWED -1
#define MAX_STACK_ENTRIES (63/BITS_PER_BLOCK)
#define WILL_OVERFLOW (1ULL<<((MAX_STACK_ENTRIES-1)*BITS_PER_BLOCK))
#define EMPTY_STACK 0
static inline int64_t
push_value(int64_t stack, Kind kind)
{
if (((uint64_t)stack) >= WILL_OVERFLOW) {
return OVERFLOWED;
}
else {
return (stack << BITS_PER_BLOCK) | kind;
}
}
static inline int64_t
pop_value(int64_t stack)
{
return Py_ARITHMETIC_RIGHT_SHIFT(int64_t, stack, BITS_PER_BLOCK);
}
#define MASK ((1<<BITS_PER_BLOCK)-1)
static inline Kind
top_of_stack(int64_t stack)
{
return stack & MASK;
}
static inline Kind
peek(int64_t stack, int n)
{
assert(n >= 1);
return (stack>>(BITS_PER_BLOCK*(n-1))) & MASK;
}
static Kind
stack_swap(int64_t stack, int n)
{
assert(n >= 1);
Kind to_swap = peek(stack, n);
Kind top = top_of_stack(stack);
int shift = BITS_PER_BLOCK*(n-1);
int64_t replaced_low = (stack & ~(MASK << shift)) | (top << shift);
int64_t replaced_top = (replaced_low & ~MASK) | to_swap;
return replaced_top;
}
static int64_t
pop_to_level(int64_t stack, int level) {
if (level == 0) {
return EMPTY_STACK;
}
int64_t max_item = (1<<BITS_PER_BLOCK) - 1;
int64_t level_max_stack = max_item << ((level-1) * BITS_PER_BLOCK);
while (stack > level_max_stack) {
stack = pop_value(stack);
}
return stack;
}
#if 0
/* These functions are useful for debugging the stack marking code */
static char
tos_char(int64_t stack) {
switch(top_of_stack(stack)) {
case Iterator:
return 'I';
case Except:
return 'E';
case Object:
return 'O';
case Lasti:
return 'L';
case Null:
return 'N';
}
return '?';
}
static void
print_stack(int64_t stack) {
if (stack < 0) {
if (stack == UNINITIALIZED) {
printf("---");
}
else if (stack == OVERFLOWED) {
printf("OVERFLOWED");
}
else {
printf("??");
}
return;
}
while (stack) {
printf("%c", tos_char(stack));
stack = pop_value(stack);
}
}
static void
print_stacks(int64_t *stacks, int n) {
for (int i = 0; i < n; i++) {
printf("%d: ", i);
print_stack(stacks[i]);
printf("\n");
}
}
#endif
static int64_t *
mark_stacks(PyCodeObject *code_obj, int len)
{
PyObject *co_code = _PyCode_GetCode(code_obj);
if (co_code == NULL) {
return NULL;
}
_Py_CODEUNIT *code = (_Py_CODEUNIT *)PyBytes_AS_STRING(co_code);
int64_t *stacks = PyMem_New(int64_t, len+1);
int i, j, opcode;
if (stacks == NULL) {
PyErr_NoMemory();
Py_DECREF(co_code);
return NULL;
}
for (int i = 1; i <= len; i++) {
stacks[i] = UNINITIALIZED;
}
stacks[0] = EMPTY_STACK;
if (code_obj->co_flags & (CO_GENERATOR | CO_COROUTINE | CO_ASYNC_GENERATOR))
{
// Generators get sent None while starting:
stacks[0] = push_value(stacks[0], Object);
}
int todo = 1;
while (todo) {
todo = 0;
/* Scan instructions */
for (i = 0; i < len; i++) {
int64_t next_stack = stacks[i];
if (next_stack == UNINITIALIZED) {
continue;
}
opcode = code[i].op.code;
switch (opcode) {
case POP_JUMP_IF_FALSE:
case POP_JUMP_IF_TRUE:
{
int64_t target_stack;
int j = get_arg(code, i);
j += i + 1;
assert(j < len);
if (stacks[j] == UNINITIALIZED && j < i) {
todo = 1;
}
next_stack = pop_value(next_stack);
target_stack = next_stack;
assert(stacks[j] == UNINITIALIZED || stacks[j] == target_stack);
stacks[j] = target_stack;
stacks[i+1] = next_stack;
break;
}
case SEND:
j = get_arg(code, i) + i + INLINE_CACHE_ENTRIES_SEND + 1;
assert(j < len);
assert(stacks[j] == UNINITIALIZED || stacks[j] == next_stack);
stacks[j] = next_stack;
stacks[i+1] = next_stack;
break;
case JUMP_FORWARD:
j = get_arg(code, i) + i + 1;
assert(j < len);
assert(stacks[j] == UNINITIALIZED || stacks[j] == next_stack);
stacks[j] = next_stack;
break;
case JUMP_BACKWARD:
case JUMP_BACKWARD_NO_INTERRUPT:
j = i + 1 - get_arg(code, i);
assert(j >= 0);
assert(j < len);
if (stacks[j] == UNINITIALIZED && j < i) {
todo = 1;
}
assert(stacks[j] == UNINITIALIZED || stacks[j] == next_stack);
stacks[j] = next_stack;
break;
case COMPARE_AND_BRANCH:
next_stack = pop_value(pop_value(next_stack));
i++;
j = get_arg(code, i) + i + 1;
assert(j < len);
assert(stacks[j] == UNINITIALIZED || stacks[j] == next_stack);
stacks[j] = next_stack;
break;
case GET_ITER:
case GET_AITER:
next_stack = push_value(pop_value(next_stack), Iterator);
stacks[i+1] = next_stack;
break;
case FOR_ITER:
{
int64_t target_stack = push_value(next_stack, Object);
stacks[i+1] = target_stack;
j = get_arg(code, i) + 1 + INLINE_CACHE_ENTRIES_FOR_ITER + i;
assert(j < len);
assert(stacks[j] == UNINITIALIZED || stacks[j] == target_stack);
stacks[j] = target_stack;
break;
}
case END_ASYNC_FOR:
next_stack = pop_value(pop_value(next_stack));
stacks[i+1] = next_stack;
break;
case PUSH_EXC_INFO:
next_stack = push_value(next_stack, Except);
stacks[i+1] = next_stack;
break;
case POP_EXCEPT:
assert(top_of_stack(next_stack) == Except);
next_stack = pop_value(next_stack);
stacks[i+1] = next_stack;
break;
case RETURN_VALUE:
assert(pop_value(next_stack) == EMPTY_STACK);
assert(top_of_stack(next_stack) == Object);
break;
case RETURN_CONST:
break;
case RAISE_VARARGS:
break;
case RERAISE:
assert(top_of_stack(next_stack) == Except);
/* End of block */
break;
case PUSH_NULL:
next_stack = push_value(next_stack, Null);
stacks[i+1] = next_stack;
break;
case LOAD_GLOBAL:
{
int j = get_arg(code, i);
if (j & 1) {
next_stack = push_value(next_stack, Null);
}
next_stack = push_value(next_stack, Object);
stacks[i+1] = next_stack;
break;
}
case LOAD_ATTR:
{
assert(top_of_stack(next_stack) == Object);
int j = get_arg(code, i);
if (j & 1) {
next_stack = pop_value(next_stack);
next_stack = push_value(next_stack, Null);
next_stack = push_value(next_stack, Object);
}
stacks[i+1] = next_stack;
break;
}
case CALL:
{
int args = get_arg(code, i);
for (int j = 0; j < args+2; j++) {
next_stack = pop_value(next_stack);
}
next_stack = push_value(next_stack, Object);
stacks[i+1] = next_stack;
break;
}
case SWAP:
{
int n = get_arg(code, i);
next_stack = stack_swap(next_stack, n);
stacks[i+1] = next_stack;
break;
}
case COPY:
{
int n = get_arg(code, i);
next_stack = push_value(next_stack, peek(next_stack, n));
stacks[i+1] = next_stack;
break;
}
default:
{
int delta = PyCompile_OpcodeStackEffect(opcode, get_arg(code, i));
assert(delta != PY_INVALID_STACK_EFFECT);
while (delta < 0) {
next_stack = pop_value(next_stack);
delta++;
}
while (delta > 0) {
next_stack = push_value(next_stack, Object);
delta--;
}
stacks[i+1] = next_stack;
}
}
}
/* Scan exception table */
unsigned char *start = (unsigned char *)PyBytes_AS_STRING(code_obj->co_exceptiontable);
unsigned char *end = start + PyBytes_GET_SIZE(code_obj->co_exceptiontable);
unsigned char *scan = start;
while (scan < end) {
int start_offset, size, handler;
scan = parse_varint(scan, &start_offset);
assert(start_offset >= 0 && start_offset < len);
scan = parse_varint(scan, &size);
assert(size >= 0 && start_offset+size <= len);
scan = parse_varint(scan, &handler);
assert(handler >= 0 && handler < len);
int depth_and_lasti;
scan = parse_varint(scan, &depth_and_lasti);
int level = depth_and_lasti >> 1;
int lasti = depth_and_lasti & 1;
if (stacks[start_offset] != UNINITIALIZED) {
if (stacks[handler] == UNINITIALIZED) {
todo = 1;
uint64_t target_stack = pop_to_level(stacks[start_offset], level);
if (lasti) {
target_stack = push_value(target_stack, Lasti);
}
target_stack = push_value(target_stack, Except);
stacks[handler] = target_stack;
}
}
}
}
Py_DECREF(co_code);
return stacks;
}
static int
compatible_stack(int64_t from_stack, int64_t to_stack)
{
if (from_stack < 0 || to_stack < 0) {
return 0;
}
while(from_stack > to_stack) {
from_stack = pop_value(from_stack);
}
while(from_stack) {
Kind from_top = top_of_stack(from_stack);
Kind to_top = top_of_stack(to_stack);
if (!compatible_kind(from_top, to_top)) {
return 0;
}
from_stack = pop_value(from_stack);
to_stack = pop_value(to_stack);
}
return to_stack == 0;
}
static const char *
explain_incompatible_stack(int64_t to_stack)
{
assert(to_stack != 0);
if (to_stack == OVERFLOWED) {
return "stack is too deep to analyze";
}
if (to_stack == UNINITIALIZED) {
return "can't jump into an exception handler, or code may be unreachable";
}
Kind target_kind = top_of_stack(to_stack);
switch(target_kind) {
case Except:
return "can't jump into an 'except' block as there's no exception";
case Lasti:
return "can't jump into a re-raising block as there's no location";
case Object:
case Null:
return "incompatible stacks";
case Iterator:
return "can't jump into the body of a for loop";
default:
Py_UNREACHABLE();
}
}
static int *
marklines(PyCodeObject *code, int len)
{
PyCodeAddressRange bounds;
_PyCode_InitAddressRange(code, &bounds);
assert (bounds.ar_end == 0);
int last_line = -1;
int *linestarts = PyMem_New(int, len);
if (linestarts == NULL) {
return NULL;
}
for (int i = 0; i < len; i++) {
linestarts[i] = -1;
}
while (_PyLineTable_NextAddressRange(&bounds)) {
assert(bounds.ar_start / (int)sizeof(_Py_CODEUNIT) < len);
if (bounds.ar_line != last_line && bounds.ar_line != -1) {
linestarts[bounds.ar_start / sizeof(_Py_CODEUNIT)] = bounds.ar_line;
last_line = bounds.ar_line;
}
}
return linestarts;
}
static int
first_line_not_before(int *lines, int len, int line)
{
int result = INT_MAX;
for (int i = 0; i < len; i++) {
if (lines[i] < result && lines[i] >= line) {
result = lines[i];
}
}
if (result == INT_MAX) {
return -1;
}
return result;
}
static PyFrameState
_PyFrame_GetState(PyFrameObject *frame)
{
assert(!_PyFrame_IsIncomplete(frame->f_frame));
if (frame->f_frame->stacktop == 0) {
return FRAME_CLEARED;
}
switch(frame->f_frame->owner) {
case FRAME_OWNED_BY_GENERATOR:
{
PyGenObject *gen = _PyFrame_GetGenerator(frame->f_frame);
return gen->gi_frame_state;
}
case FRAME_OWNED_BY_THREAD:
{
if (_PyInterpreterFrame_LASTI(frame->f_frame) < 0) {
return FRAME_CREATED;
}
switch (frame->f_frame->prev_instr->op.code)
{
case COPY_FREE_VARS:
case MAKE_CELL:
case RETURN_GENERATOR:
/* Frame not fully initialized */
return FRAME_CREATED;
default:
return FRAME_EXECUTING;
}
}
case FRAME_OWNED_BY_FRAME_OBJECT:
return FRAME_COMPLETED;
}
Py_UNREACHABLE();
}
/* Setter for f_lineno - you can set f_lineno from within a trace function in
* order to jump to a given line of code, subject to some restrictions. Most
* lines are OK to jump to because they don't make any assumptions about the
* state of the stack (obvious because you could remove the line and the code
* would still work without any stack errors), but there are some constructs
* that limit jumping:
*
* o Any exception handlers.
* o 'for' and 'async for' loops can't be jumped into because the
* iterator needs to be on the stack.
* o Jumps cannot be made from within a trace function invoked with a
* 'return' or 'exception' event since the eval loop has been exited at
* that time.
*/
static int
frame_setlineno(PyFrameObject *f, PyObject* p_new_lineno, void *Py_UNUSED(ignored))
{
if (p_new_lineno == NULL) {
PyErr_SetString(PyExc_AttributeError, "cannot delete attribute");
return -1;
}
/* f_lineno must be an integer. */
if (!PyLong_CheckExact(p_new_lineno)) {
PyErr_SetString(PyExc_ValueError,
"lineno must be an integer");
return -1;
}
PyFrameState state = _PyFrame_GetState(f);
/*
* This code preserves the historical restrictions on
* setting the line number of a frame.
* Jumps are forbidden on a 'return' trace event (except after a yield).
* Jumps from 'call' trace events are also forbidden.
* In addition, jumps are forbidden when not tracing,
* as this is a debugging feature.
*/
switch(PyThreadState_GET()->tracing_what) {
case PyTrace_EXCEPTION:
PyErr_SetString(PyExc_ValueError,
"can only jump from a 'line' trace event");
return -1;
case PyTrace_CALL:
PyErr_Format(PyExc_ValueError,
"can't jump from the 'call' trace event of a new frame");
return -1;
case PyTrace_LINE:
break;
case PyTrace_RETURN:
if (state == FRAME_SUSPENDED) {
break;
}
/* fall through */
default:
PyErr_SetString(PyExc_ValueError,
"can only jump from a 'line' trace event");
return -1;
}
if (!f->f_trace) {
PyErr_Format(PyExc_ValueError,
"f_lineno can only be set by a trace function");
return -1;
}
int new_lineno;
/* Fail if the line falls outside the code block and
select first line with actual code. */
int overflow;
long l_new_lineno = PyLong_AsLongAndOverflow(p_new_lineno, &overflow);
if (overflow
#if SIZEOF_LONG > SIZEOF_INT
|| l_new_lineno > INT_MAX
|| l_new_lineno < INT_MIN
#endif
) {
PyErr_SetString(PyExc_ValueError,
"lineno out of range");
return -1;
}
new_lineno = (int)l_new_lineno;
if (new_lineno < f->f_frame->f_code->co_firstlineno) {
PyErr_Format(PyExc_ValueError,
"line %d comes before the current code block",
new_lineno);
return -1;
}
/* PyCode_NewWithPosOnlyArgs limits co_code to be under INT_MAX so this
* should never overflow. */
int len = (int)Py_SIZE(f->f_frame->f_code);
int *lines = marklines(f->f_frame->f_code, len);
if (lines == NULL) {
return -1;
}
new_lineno = first_line_not_before(lines, len, new_lineno);
if (new_lineno < 0) {
PyErr_Format(PyExc_ValueError,
"line %d comes after the current code block",
(int)l_new_lineno);
PyMem_Free(lines);
return -1;
}
int64_t *stacks = mark_stacks(f->f_frame->f_code, len);
if (stacks == NULL) {
PyMem_Free(lines);
return -1;
}
int64_t best_stack = OVERFLOWED;
int best_addr = -1;
int64_t start_stack = stacks[_PyInterpreterFrame_LASTI(f->f_frame)];
int err = -1;
const char *msg = "cannot find bytecode for specified line";
for (int i = 0; i < len; i++) {
if (lines[i] == new_lineno) {
int64_t target_stack = stacks[i];
if (compatible_stack(start_stack, target_stack)) {
err = 0;
if (target_stack > best_stack) {
best_stack = target_stack;
best_addr = i;
}
}
else if (err < 0) {
if (start_stack == OVERFLOWED) {
msg = "stack to deep to analyze";
}
else if (start_stack == UNINITIALIZED) {
msg = "can't jump from unreachable code";
}
else {
msg = explain_incompatible_stack(target_stack);
err = 1;
}
}
}
}
PyMem_Free(stacks);
PyMem_Free(lines);
if (err) {
PyErr_SetString(PyExc_ValueError, msg);
return -1;
}
// Populate any NULL locals that the compiler might have "proven" to exist
// in the new location. Rather than crashing or changing co_code, just bind
// None instead:
int unbound = 0;
for (int i = 0; i < f->f_frame->f_code->co_nlocalsplus; i++) {
// Counting every unbound local is overly-cautious, but a full flow
// analysis (like we do in the compiler) is probably too expensive:
unbound += f->f_frame->localsplus[i] == NULL;
}
if (unbound) {
const char *e = "assigning None to %d unbound local%s";
const char *s = (unbound == 1) ? "" : "s";
if (PyErr_WarnFormat(PyExc_RuntimeWarning, 0, e, unbound, s)) {
return -1;
}
// Do this in a second pass to avoid writing a bunch of Nones when
// warnings are being treated as errors and the previous bit raises:
for (int i = 0; i < f->f_frame->f_code->co_nlocalsplus; i++) {
if (f->f_frame->localsplus[i] == NULL) {
f->f_frame->localsplus[i] = Py_NewRef(Py_None);
unbound--;
}
}
assert(unbound == 0);
}
if (state == FRAME_SUSPENDED) {
/* Account for value popped by yield */
start_stack = pop_value(start_stack);
}
while (start_stack > best_stack) {
if (top_of_stack(start_stack) == Except) {
/* Pop exception stack as well as the evaluation stack */
PyThreadState *tstate = _PyThreadState_GET();
_PyErr_StackItem *exc_info = tstate->exc_info;
PyObject *value = exc_info->exc_value;
PyObject *exc = _PyFrame_StackPop(f->f_frame);
assert(PyExceptionInstance_Check(exc) || exc == Py_None);
exc_info->exc_value = exc;
Py_XDECREF(value);
}
else {
PyObject *v = _PyFrame_StackPop(f->f_frame);
Py_XDECREF(v);
}
start_stack = pop_value(start_stack);
}
/* Finally set the new lasti and return OK. */
f->f_lineno = 0;
f->f_frame->prev_instr = _PyCode_CODE(f->f_frame->f_code) + best_addr;
return 0;
}
static PyObject *
frame_gettrace(PyFrameObject *f, void *closure)
{
PyObject* trace = f->f_trace;
if (trace == NULL)
trace = Py_None;
return Py_NewRef(trace);
}
static int
frame_settrace(PyFrameObject *f, PyObject* v, void *closure)
{
if (v == Py_None) {
v = NULL;
}
Py_XSETREF(f->f_trace, Py_XNewRef(v));
return 0;
}
static PyGetSetDef frame_getsetlist[] = {
{"f_back", (getter)frame_getback, NULL, NULL},
{"f_locals", (getter)frame_getlocals, NULL, NULL},
{"f_lineno", (getter)frame_getlineno,
(setter)frame_setlineno, NULL},
{"f_trace", (getter)frame_gettrace, (setter)frame_settrace, NULL},
{"f_lasti", (getter)frame_getlasti, NULL, NULL},
{"f_globals", (getter)frame_getglobals, NULL, NULL},
{"f_builtins", (getter)frame_getbuiltins, NULL, NULL},
{"f_code", (getter)frame_getcode, NULL, NULL},
{0}
};
static void
frame_dealloc(PyFrameObject *f)
{
/* It is the responsibility of the owning generator/coroutine
* to have cleared the generator pointer */
assert(f->f_frame->owner != FRAME_OWNED_BY_GENERATOR ||
_PyFrame_GetGenerator(f->f_frame)->gi_frame_state == FRAME_CLEARED);
if (_PyObject_GC_IS_TRACKED(f)) {
_PyObject_GC_UNTRACK(f);
}
if (f->f_weakreflist != NULL) {
PyObject_ClearWeakRefs((PyObject *)f);
}
Py_TRASHCAN_BEGIN(f, frame_dealloc);
PyCodeObject *co = NULL;
/* Kill all local variables including specials, if we own them */
if (f->f_frame->owner == FRAME_OWNED_BY_FRAME_OBJECT) {
assert(f->f_frame == (_PyInterpreterFrame *)f->_f_frame_data);
_PyInterpreterFrame *frame = (_PyInterpreterFrame *)f->_f_frame_data;
/* Don't clear code object until the end */
co = frame->f_code;
frame->f_code = NULL;
Py_CLEAR(frame->f_funcobj);
Py_CLEAR(frame->f_locals);
PyObject **locals = _PyFrame_GetLocalsArray(frame);
for (int i = 0; i < frame->stacktop; i++) {
Py_CLEAR(locals[i]);
}
}
Py_CLEAR(f->f_back);
Py_CLEAR(f->f_trace);
PyObject_GC_Del(f);
Py_XDECREF(co);
Py_TRASHCAN_END;
}
static int
frame_traverse(PyFrameObject *f, visitproc visit, void *arg)
{
Py_VISIT(f->f_back);
Py_VISIT(f->f_trace);
if (f->f_frame->owner != FRAME_OWNED_BY_FRAME_OBJECT) {
return 0;
}
assert(f->f_frame->frame_obj == NULL);
return _PyFrame_Traverse(f->f_frame, visit, arg);
}
static int
frame_tp_clear(PyFrameObject *f)
{
Py_CLEAR(f->f_trace);
/* locals and stack */
PyObject **locals = _PyFrame_GetLocalsArray(f->f_frame);
assert(f->f_frame->stacktop >= 0);
for (int i = 0; i < f->f_frame->stacktop; i++) {
Py_CLEAR(locals[i]);
}
f->f_frame->stacktop = 0;
return 0;
}
static PyObject *
frame_clear(PyFrameObject *f, PyObject *Py_UNUSED(ignored))
{
if (f->f_frame->owner == FRAME_OWNED_BY_GENERATOR) {
PyGenObject *gen = _PyFrame_GetGenerator(f->f_frame);
if (gen->gi_frame_state == FRAME_EXECUTING) {
goto running;
}
_PyGen_Finalize((PyObject *)gen);
}
else if (f->f_frame->owner == FRAME_OWNED_BY_THREAD) {
goto running;
}
else {
assert(f->f_frame->owner == FRAME_OWNED_BY_FRAME_OBJECT);
(void)frame_tp_clear(f);
}
Py_RETURN_NONE;
running:
PyErr_SetString(PyExc_RuntimeError,
"cannot clear an executing frame");
return NULL;
}
PyDoc_STRVAR(clear__doc__,
"F.clear(): clear most references held by the frame");
static PyObject *
frame_sizeof(PyFrameObject *f, PyObject *Py_UNUSED(ignored))
{
Py_ssize_t res;
res = offsetof(PyFrameObject, _f_frame_data) + offsetof(_PyInterpreterFrame, localsplus);
PyCodeObject *code = f->f_frame->f_code;
res += _PyFrame_NumSlotsForCodeObject(code) * sizeof(PyObject *);
return PyLong_FromSsize_t(res);
}
PyDoc_STRVAR(sizeof__doc__,
"F.__sizeof__() -> size of F in memory, in bytes");
static PyObject *
frame_repr(PyFrameObject *f)
{
int lineno = PyFrame_GetLineNumber(f);
PyCodeObject *code = f->f_frame->f_code;
return PyUnicode_FromFormat(
"<frame at %p, file %R, line %d, code %S>",
f, code->co_filename, lineno, code->co_name);
}
static PyMethodDef frame_methods[] = {
{"clear", (PyCFunction)frame_clear, METH_NOARGS,
clear__doc__},
{"__sizeof__", (PyCFunction)frame_sizeof, METH_NOARGS,
sizeof__doc__},
{NULL, NULL} /* sentinel */
};
PyTypeObject PyFrame_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"frame",
offsetof(PyFrameObject, _f_frame_data) +
offsetof(_PyInterpreterFrame, localsplus),
sizeof(PyObject *),
(destructor)frame_dealloc, /* tp_dealloc */
0, /* tp_vectorcall_offset */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_as_async */
(reprfunc)frame_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
PyObject_GenericSetAttr, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
0, /* tp_doc */