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pocketpy/src/modules/pickle.c
AryanK37 50e5f521c2 Fix typos
2025-03-03 21:23:30 +05:30

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#include "pocketpy/common/vector.h"
#include "pocketpy/interpreter/typeinfo.h"
#include "pocketpy/pocketpy.h"
#include "pocketpy/common/utils.h"
#include "pocketpy/common/sstream.h"
#include "pocketpy/interpreter/vm.h"
#include "pocketpy/interpreter/array2d.h"
#include <stdint.h>
typedef enum {
// clang-format off
PKL_MEMO_GET,
PKL_MEMO_SET,
PKL_NIL, PKL_NONE, PKL_ELLIPSIS,
PKL_INT_0, PKL_INT_1, PKL_INT_2, PKL_INT_3, PKL_INT_4, PKL_INT_5, PKL_INT_6, PKL_INT_7,
PKL_INT_8, PKL_INT_9, PKL_INT_10, PKL_INT_11, PKL_INT_12, PKL_INT_13, PKL_INT_14, PKL_INT_15,
PKL_INT8, PKL_INT16, PKL_INT32, PKL_INT64,
PKL_FLOAT32, PKL_FLOAT64,
PKL_TRUE, PKL_FALSE,
PKL_STRING, PKL_BYTES,
PKL_BUILD_LIST,
PKL_BUILD_TUPLE,
PKL_BUILD_DICT,
PKL_VEC2, PKL_VEC3,
PKL_VEC2I, PKL_VEC3I,
PKL_TYPE,
PKL_ARRAY2D,
PKL_TVALUE,
PKL_CALL,
PKL_OBJECT,
PKL_EOF,
// clang-format on
} PickleOp;
typedef struct {
bool* used_types;
int used_types_length;
c11_smallmap_p2i memo;
c11_vector /*T=char*/ codes;
} PickleObject;
static void PickleObject__ctor(PickleObject* self) {
self->used_types_length = pk_current_vm->types.length;
self->used_types = PK_MALLOC(self->used_types_length);
memset(self->used_types, 0, self->used_types_length);
c11_smallmap_p2i__ctor(&self->memo);
c11_vector__ctor(&self->codes, sizeof(char));
}
static void PickleObject__dtor(PickleObject* self) {
PK_FREE(self->used_types);
c11_smallmap_p2i__dtor(&self->memo);
c11_vector__dtor(&self->codes);
}
static bool PickleObject__py_submit(PickleObject* self, py_OutRef out);
static void PickleObject__write_bytes(PickleObject* buf, const void* data, int size) {
c11_vector__extend(char, &buf->codes, data, size);
}
static void c11_sbuf__write_type_path(c11_sbuf* path_buf, py_Type type) {
py_TypeInfo* ti = pk__type_info(type);
if(py_isnil(&ti->module)) {
c11_sbuf__write_cstr(path_buf, py_name2str(ti->name));
return;
}
const char* mod_path = py_tostr(py_getdict(&ti->module, __path__));
c11_sbuf__write_cstr(path_buf, mod_path);
c11_sbuf__write_char(path_buf, '.');
c11_sbuf__write_cstr(path_buf, py_name2str(ti->name));
}
static void pkl__emit_op(PickleObject* buf, PickleOp op) {
c11_vector__push(char, &buf->codes, op);
}
static void pkl__emit_int(PickleObject* buf, py_i64 val) {
if(val >= 0 && val <= 15) {
pkl__emit_op(buf, PKL_INT_0 + val);
return;
}
if(INT8_MIN <= val && val <= INT8_MAX) {
pkl__emit_op(buf, PKL_INT8);
PickleObject__write_bytes(buf, &val, 1);
} else if(INT16_MIN <= val && val <= INT16_MAX) {
pkl__emit_op(buf, PKL_INT16);
PickleObject__write_bytes(buf, &val, 2);
} else if(INT32_MIN <= val && val <= INT32_MAX) {
pkl__emit_op(buf, PKL_INT32);
PickleObject__write_bytes(buf, &val, 4);
} else {
pkl__emit_op(buf, PKL_INT64);
PickleObject__write_bytes(buf, &val, 8);
}
}
#define UNALIGNED_READ(p_val, p_buf) \
do { \
memcpy((p_val), (p_buf), sizeof(*(p_val))); \
(p_buf) += sizeof(*(p_val)); \
} while(0)
static py_i64 pkl__read_int(const unsigned char** p) {
PickleOp op = (PickleOp) * *p;
(*p)++;
switch(op) {
// clang-format off
case PKL_INT_0: return 0; case PKL_INT_1: return 1; case PKL_INT_2: return 2; case PKL_INT_3: return 3;
case PKL_INT_4: return 4; case PKL_INT_5: return 5; case PKL_INT_6: return 6; case PKL_INT_7: return 7;
case PKL_INT_8: return 8; case PKL_INT_9: return 9; case PKL_INT_10: return 10; case PKL_INT_11: return 11;
case PKL_INT_12: return 12; case PKL_INT_13: return 13; case PKL_INT_14: return 14; case PKL_INT_15: return 15;
// clang-format on
case PKL_INT8: {
int8_t val;
UNALIGNED_READ(&val, *p);
return val;
}
case PKL_INT16: {
int16_t val;
UNALIGNED_READ(&val, *p);
return val;
}
case PKL_INT32: {
int32_t val;
UNALIGNED_READ(&val, *p);
return val;
}
case PKL_INT64: {
int64_t val;
UNALIGNED_READ(&val, *p);
return val;
}
default: c11__abort("pkl__read_int(): invalid op: %d", op);
}
}
static bool pickle_loads(int argc, py_Ref argv) {
PY_CHECK_ARGC(1);
PY_CHECK_ARG_TYPE(0, tp_bytes);
int size;
const unsigned char* data = py_tobytes(argv, &size);
return py_pickle_loads(data, size);
}
static bool pickle_dumps(int argc, py_Ref argv) {
PY_CHECK_ARGC(1);
return py_pickle_dumps(argv);
}
void pk__add_module_pickle() {
py_Ref mod = py_newmodule("pickle");
py_bindfunc(mod, "loads", pickle_loads);
py_bindfunc(mod, "dumps", pickle_dumps);
}
static bool pkl__write_object(PickleObject* buf, py_TValue* obj);
static bool pkl__write_array(PickleObject* buf, PickleOp op, py_TValue* arr, int length) {
for(int i = 0; i < length; i++) {
bool ok = pkl__write_object(buf, arr + i);
if(!ok) return false;
}
pkl__emit_op(buf, op);
pkl__emit_int(buf, length);
return true;
}
static bool pkl__write_dict_kv(py_Ref k, py_Ref v, void* ctx) {
PickleObject* buf = (PickleObject*)ctx;
if(!pkl__write_object(buf, k)) return false;
if(!pkl__write_object(buf, v)) return false;
return true;
}
static bool pkl__try_memo(PickleObject* buf, PyObject* memo_key) {
int index = c11_smallmap_p2i__get(&buf->memo, memo_key, -1);
if(index != -1) {
pkl__emit_op(buf, PKL_MEMO_GET);
pkl__emit_int(buf, index);
return true;
}
return false;
}
static void pkl__store_memo(PickleObject* buf, PyObject* memo_key) {
int index = buf->memo.length;
c11_smallmap_p2i__set(&buf->memo, memo_key, index);
pkl__emit_op(buf, PKL_MEMO_SET);
pkl__emit_int(buf, index);
}
static bool pkl__write_object(PickleObject* buf, py_TValue* obj) {
switch(obj->type) {
case tp_nil: {
return ValueError("'nil' object is not picklable");
}
case tp_NoneType: {
pkl__emit_op(buf, PKL_NONE);
return true;
}
case tp_ellipsis: {
pkl__emit_op(buf, PKL_ELLIPSIS);
return true;
}
case tp_int: {
py_i64 val = obj->_i64;
pkl__emit_int(buf, val);
return true;
}
case tp_float: {
py_f64 val = obj->_f64;
float val32 = (float)val;
if(val == val32) {
pkl__emit_op(buf, PKL_FLOAT32);
PickleObject__write_bytes(buf, &val32, 4);
} else {
pkl__emit_op(buf, PKL_FLOAT64);
PickleObject__write_bytes(buf, &val, 8);
}
return true;
}
case tp_bool: {
bool val = obj->_bool;
pkl__emit_op(buf, val ? PKL_TRUE : PKL_FALSE);
return true;
}
case tp_str: {
if(pkl__try_memo(buf, obj->_obj))
return true;
else {
pkl__emit_op(buf, PKL_STRING);
c11_sv sv = py_tosv(obj);
pkl__emit_int(buf, sv.size);
PickleObject__write_bytes(buf, sv.data, sv.size);
}
pkl__store_memo(buf, obj->_obj);
return true;
}
case tp_bytes: {
if(pkl__try_memo(buf, obj->_obj))
return true;
else {
pkl__emit_op(buf, PKL_BYTES);
int size;
unsigned char* data = py_tobytes(obj, &size);
pkl__emit_int(buf, size);
PickleObject__write_bytes(buf, data, size);
}
pkl__store_memo(buf, obj->_obj);
return true;
}
case tp_list: {
if(pkl__try_memo(buf, obj->_obj))
return true;
else {
bool ok =
pkl__write_array(buf, PKL_BUILD_LIST, py_list_data(obj), py_list_len(obj));
if(!ok) return false;
}
pkl__store_memo(buf, obj->_obj);
return true;
}
case tp_tuple: {
if(pkl__try_memo(buf, obj->_obj))
return true;
else {
bool ok =
pkl__write_array(buf, PKL_BUILD_TUPLE, py_tuple_data(obj), py_tuple_len(obj));
if(!ok) return false;
}
pkl__store_memo(buf, obj->_obj);
return true;
}
case tp_dict: {
if(pkl__try_memo(buf, obj->_obj))
return true;
else {
bool ok = py_dict_apply(obj, pkl__write_dict_kv, (void*)buf);
if(!ok) return false;
pkl__emit_op(buf, PKL_BUILD_DICT);
pkl__emit_int(buf, py_dict_len(obj));
}
pkl__store_memo(buf, obj->_obj);
return true;
}
case tp_vec2: {
c11_vec2 val = py_tovec2(obj);
pkl__emit_op(buf, PKL_VEC2);
PickleObject__write_bytes(buf, &val, sizeof(c11_vec2));
return true;
}
case tp_vec3: {
c11_vec3 val = py_tovec3(obj);
pkl__emit_op(buf, PKL_VEC3);
PickleObject__write_bytes(buf, &val, sizeof(c11_vec3));
return true;
}
case tp_vec2i: {
c11_vec2i val = py_tovec2i(obj);
pkl__emit_op(buf, PKL_VEC2I);
pkl__emit_int(buf, val.x);
pkl__emit_int(buf, val.y);
return true;
}
case tp_vec3i: {
c11_vec3i val = py_tovec3i(obj);
pkl__emit_op(buf, PKL_VEC3I);
pkl__emit_int(buf, val.x);
pkl__emit_int(buf, val.y);
pkl__emit_int(buf, val.z);
return true;
}
case tp_type: {
pkl__emit_op(buf, PKL_TYPE);
py_Type type = py_totype(obj);
buf->used_types[type] = true;
pkl__emit_int(buf, type);
return true;
}
case tp_array2d: {
if(pkl__try_memo(buf, obj->_obj))
return true;
else {
c11_array2d* arr = py_touserdata(obj);
for(int i = 0; i < arr->header.numel; i++) {
if(arr->data[i].is_ptr)
return TypeError(
"'array2d' object is not picklable because it contains heap-allocated objects");
buf->used_types[arr->data[i].type] = true;
}
pkl__emit_op(buf, PKL_ARRAY2D);
pkl__emit_int(buf, arr->header.n_cols);
pkl__emit_int(buf, arr->header.n_rows);
PickleObject__write_bytes(buf, arr->data, arr->header.numel * sizeof(py_TValue));
}
pkl__store_memo(buf, obj->_obj);
return true;
}
default: {
if(!obj->is_ptr) {
pkl__emit_op(buf, PKL_TVALUE);
PickleObject__write_bytes(buf, obj, sizeof(py_TValue));
buf->used_types[obj->type] = true;
return true;
}
// try memo for `is_ptr=true` objects
if(pkl__try_memo(buf, obj->_obj)) return true;
py_TypeInfo* ti = pk__type_info(obj->type);
py_Ref f_reduce = py_tpfindmagic(obj->type, __reduce__);
if(f_reduce != NULL) {
if(!py_call(f_reduce, 1, obj)) return false;
// expected: (callable, args)
py_Ref reduced = py_retval();
if(!py_istuple(reduced)) { return TypeError("__reduce__ must return a tuple"); }
if(py_tuple_len(reduced) != 2) {
return TypeError("__reduce__ must return a tuple of length 2");
}
if(!pkl__write_object(buf, py_tuple_getitem(reduced, 0))) return false;
pkl__emit_op(buf, PKL_NIL);
py_Ref args_tuple = py_tuple_getitem(reduced, 1);
int args_length = py_tuple_len(args_tuple);
for(int i = 0; i < args_length; i++) {
if(!pkl__write_object(buf, py_tuple_getitem(args_tuple, i))) return false;
}
pkl__emit_op(buf, PKL_CALL);
pkl__emit_int(buf, args_length);
// store memo
pkl__store_memo(buf, obj->_obj);
return true;
}
if(ti->is_python) {
NameDict* dict = PyObject__dict(obj->_obj);
for(int i = dict->length - 1; i >= 0; i--) {
NameDict_KV* kv = c11__at(NameDict_KV, dict, i);
if(!pkl__write_object(buf, &kv->value)) return false;
}
pkl__emit_op(buf, PKL_OBJECT);
pkl__emit_int(buf, obj->type);
buf->used_types[obj->type] = true;
pkl__emit_int(buf, dict->length);
for(int i = 0; i < dict->length; i++) {
NameDict_KV* kv = c11__at(NameDict_KV, dict, i);
c11_sv field = py_name2sv(kv->key);
// include '\0'
PickleObject__write_bytes(buf, field.data, field.size + 1);
}
// store memo
pkl__store_memo(buf, obj->_obj);
return true;
}
return TypeError("'%t' object is not picklable", obj->type);
}
}
c11__unreachable();
}
bool py_pickle_dumps(py_Ref val) {
PickleObject buf;
PickleObject__ctor(&buf);
bool ok = pkl__write_object(&buf, val);
if(!ok) {
PickleObject__dtor(&buf);
return false;
}
pkl__emit_op(&buf, PKL_EOF);
return PickleObject__py_submit(&buf, py_retval());
}
static py_Type pkl__header_find_type(c11_sv path) {
int sep_index = c11_sv__rindex(path, '.');
if(sep_index == -1) return py_gettype(NULL, py_namev(path));
c11_sv mod_name = c11_sv__slice2(path, 0, sep_index);
c11_sv name = c11_sv__slice(path, sep_index + 1);
char buf[PK_MAX_MODULE_PATH_LEN + 1];
memcpy(buf, mod_name.data, mod_name.size);
buf[mod_name.size] = '\0';
return py_gettype(buf, py_namev(name));
}
static c11_sv pkl__header_read_sv(const unsigned char** p, char sep) {
c11_sv text;
text.data = (const char*)*p;
const char* p_end = strchr(text.data, sep);
assert(p_end != NULL);
text.size = p_end - text.data;
*p = (const unsigned char*)p_end + 1;
return text;
}
static py_i64 pkl__header_read_int(const unsigned char** p, char sep) {
c11_sv text = pkl__header_read_sv(p, sep);
py_i64 out;
IntParsingResult res = c11__parse_uint(text, &out, 10);
assert(res == IntParsing_SUCCESS);
return out;
}
bool py_pickle_loads_body(const unsigned char* p, int memo_length, c11_smallmap_n2i* type_mapping);
bool py_pickle_loads(const unsigned char* data, int size) {
const unsigned char* p = data;
c11_smallmap_n2i type_mapping;
c11_smallmap_n2i__ctor(&type_mapping);
while(true) {
if(*p == '\n') {
p++;
break;
}
py_Type type = pkl__header_read_int(&p, '(');
c11_sv path = pkl__header_read_sv(&p, ')');
py_Type new_type = pkl__header_find_type(path);
if(new_type == 0) {
c11_smallmap_n2i__dtor(&type_mapping);
return ImportError("cannot find type '%v'", path);
}
if(type != new_type) c11_smallmap_n2i__set(&type_mapping, type, new_type);
}
int memo_length = pkl__header_read_int(&p, '\n');
bool ok = py_pickle_loads_body(p, memo_length, &type_mapping);
c11_smallmap_n2i__dtor(&type_mapping);
return ok;
}
static py_Type pkl__fix_type(py_Type type, c11_smallmap_n2i* type_mapping) {
int new_type = c11_smallmap_n2i__get(type_mapping, type, -1);
if(new_type != -1) return (py_Type)new_type;
return type;
}
bool py_pickle_loads_body(const unsigned char* p, int memo_length, c11_smallmap_n2i* type_mapping) {
py_StackRef p0 = py_peek(0);
py_Ref p_memo = py_newtuple(py_pushtmp(), memo_length);
while(true) {
PickleOp op = (PickleOp)*p;
p++;
switch(op) {
case PKL_MEMO_GET: {
int index = pkl__read_int(&p);
py_Ref val = &p_memo[index];
assert(!py_isnil(val));
py_push(val);
break;
}
case PKL_MEMO_SET: {
int index = pkl__read_int(&p);
p_memo[index] = *py_peek(-1);
break;
}
case PKL_NIL: {
py_pushnil();
break;
}
case PKL_NONE: {
py_pushnone();
break;
}
case PKL_ELLIPSIS: {
py_newellipsis(py_pushtmp());
break;
}
// clang-format off
case PKL_INT_0: case PKL_INT_1: case PKL_INT_2: case PKL_INT_3:
case PKL_INT_4: case PKL_INT_5: case PKL_INT_6: case PKL_INT_7:
case PKL_INT_8: case PKL_INT_9: case PKL_INT_10: case PKL_INT_11:
case PKL_INT_12: case PKL_INT_13: case PKL_INT_14: case PKL_INT_15: {
py_newint(py_pushtmp(), op - PKL_INT_0);
break;
}
// clang-format on
case PKL_INT8: {
int8_t val;
UNALIGNED_READ(&val, p);
py_newint(py_pushtmp(), val);
break;
}
case PKL_INT16: {
int16_t val;
UNALIGNED_READ(&val, p);
py_newint(py_pushtmp(), val);
break;
}
case PKL_INT32: {
int32_t val;
UNALIGNED_READ(&val, p);
py_newint(py_pushtmp(), val);
break;
}
case PKL_INT64: {
int64_t val;
UNALIGNED_READ(&val, p);
py_newint(py_pushtmp(), val);
break;
}
case PKL_FLOAT32: {
float val;
UNALIGNED_READ(&val, p);
py_newfloat(py_pushtmp(), val);
break;
}
case PKL_FLOAT64: {
double val;
UNALIGNED_READ(&val, p);
py_newfloat(py_pushtmp(), val);
break;
}
case PKL_TRUE: {
py_newbool(py_pushtmp(), true);
break;
}
case PKL_FALSE: {
py_newbool(py_pushtmp(), false);
break;
}
case PKL_STRING: {
int size = pkl__read_int(&p);
char* dst = py_newstrn(py_pushtmp(), size);
memcpy(dst, p, size);
p += size;
break;
}
case PKL_BYTES: {
int size = pkl__read_int(&p);
unsigned char* dst = py_newbytes(py_pushtmp(), size);
memcpy(dst, p, size);
p += size;
break;
}
case PKL_BUILD_LIST: {
int length = pkl__read_int(&p);
py_OutRef val = py_retval();
py_newlistn(val, length);
for(int i = length - 1; i >= 0; i--) {
py_StackRef item = py_peek(-1);
py_list_setitem(val, i, item);
py_pop();
}
py_push(val);
break;
}
case PKL_BUILD_TUPLE: {
int length = pkl__read_int(&p);
py_OutRef val = py_retval();
py_Ref p = py_newtuple(val, length);
for(int i = length - 1; i >= 0; i--) {
p[i] = *py_peek(-1);
py_pop();
}
py_push(val);
break;
}
case PKL_BUILD_DICT: {
int length = pkl__read_int(&p);
py_OutRef val = py_pushtmp();
py_newdict(val);
py_StackRef begin = py_peek(-1) - 2 * length;
py_StackRef end = py_peek(-1);
for(py_StackRef i = begin; i < end; i += 2) {
py_StackRef k = i;
py_StackRef v = i + 1;
bool ok = py_dict_setitem(val, k, v);
if(!ok) return false;
}
py_assign(py_retval(), val);
py_shrink(2 * length + 1);
py_push(py_retval());
break;
}
case PKL_VEC2: {
c11_vec2 val;
UNALIGNED_READ(&val, p);
py_newvec2(py_pushtmp(), val);
break;
}
case PKL_VEC3: {
c11_vec3 val;
UNALIGNED_READ(&val, p);
py_newvec3(py_pushtmp(), val);
break;
}
case PKL_VEC2I: {
c11_vec2i val;
val.x = pkl__read_int(&p);
val.y = pkl__read_int(&p);
py_newvec2i(py_pushtmp(), val);
break;
}
case PKL_VEC3I: {
c11_vec3i val;
val.x = pkl__read_int(&p);
val.y = pkl__read_int(&p);
val.z = pkl__read_int(&p);
py_newvec3i(py_pushtmp(), val);
break;
}
case PKL_TYPE: {
py_Type type = (py_Type)pkl__read_int(&p);
type = pkl__fix_type(type, type_mapping);
py_push(py_tpobject(type));
break;
}
case PKL_ARRAY2D: {
int n_cols = pkl__read_int(&p);
int n_rows = pkl__read_int(&p);
c11_array2d* arr = py_newarray2d(py_pushtmp(), n_cols, n_rows);
int total_size = arr->header.numel * sizeof(py_TValue);
memcpy(arr->data, p, total_size);
for(int i = 0; i < arr->header.numel; i++) {
arr->data[i].type = pkl__fix_type(arr->data[i].type, type_mapping);
}
p += total_size;
break;
}
case PKL_TVALUE: {
py_TValue* tmp = py_pushtmp();
memcpy(tmp, p, sizeof(py_TValue));
tmp->type = pkl__fix_type(tmp->type, type_mapping);
p += sizeof(py_TValue);
break;
}
case PKL_CALL: {
int argc = pkl__read_int(&p);
if(!py_vectorcall(argc, 0)) return false;
py_push(py_retval());
break;
}
case PKL_OBJECT: {
py_Type type = (py_Type)pkl__read_int(&p);
type = pkl__fix_type(type, type_mapping);
py_newobject(py_retval(), type, -1, 0);
NameDict* dict = PyObject__dict(py_retval()->_obj);
int dict_length = pkl__read_int(&p);
for(int i = 0; i < dict_length; i++) {
py_StackRef value = py_peek(-1);
c11_sv field = {(const char*)p, strlen((const char*)p)};
NameDict__set(dict, py_namev(field), *value);
py_pop();
p += field.size + 1;
}
py_push(py_retval());
break;
}
case PKL_EOF: {
// [memo, obj]
if(py_peek(0) - p0 != 2) return ValueError("invalid pickle data");
py_assign(py_retval(), py_peek(-1));
py_shrink(2);
return true;
}
default: c11__unreachable();
}
}
c11__unreachable();
}
static bool PickleObject__py_submit(PickleObject* self, py_OutRef out) {
c11_sbuf cleartext;
c11_sbuf__ctor(&cleartext);
// line 1: type mapping
for(py_Type type = 0; type < self->used_types_length; type++) {
if(self->used_types[type]) {
c11_sbuf__write_int(&cleartext, type);
c11_sbuf__write_char(&cleartext, '(');
c11_sbuf__write_type_path(&cleartext, type);
c11_sbuf__write_char(&cleartext, ')');
}
}
c11_sbuf__write_char(&cleartext, '\n');
// line 2: memo length
c11_sbuf__write_int(&cleartext, self->memo.length);
c11_sbuf__write_char(&cleartext, '\n');
// -------------------------------------------------- //
c11_string* header = c11_sbuf__submit(&cleartext);
int total_size = header->size + self->codes.length;
unsigned char* p = py_newbytes(py_retval(), total_size);
memcpy(p, header->data, header->size);
memcpy(p + header->size, self->codes.data, self->codes.length);
c11_string__delete(header);
PickleObject__dtor(self);
return true;
}
#undef UNALIGNED_READ
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