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pocketpy/src/vm.h
blueloveTH d4401bfa98 up
2023-01-27 05:52:19 +08:00

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#pragma once
#include "codeobject.h"
#include "iter.h"
#include "error.h"
#define __DEF_PY_AS_C(type, ctype, ptype) \
inline ctype& Py##type##_AS_C(const PyVar& obj) { \
check_type(obj, ptype); \
return UNION_GET(ctype, obj); \
}
#define __DEF_PY(type, ctype, ptype) \
inline PyVar Py##type(ctype value) { \
return new_object(ptype, value); \
}
#define DEF_NATIVE(type, ctype, ptype) \
__DEF_PY(type, ctype, ptype) \
__DEF_PY_AS_C(type, ctype, ptype)
class VM {
std::vector<PyVar> _small_integers; // [-5, 256]
PyVarDict _modules; // loaded modules
emhash8::HashMap<_Str, _Str> _lazy_modules; // lazy loaded modules
protected:
std::deque< std::unique_ptr<Frame> > callstack;
PyVar __py2py_call_signal;
PyVar run_frame(Frame* frame){
while(frame->has_next_bytecode()){
const Bytecode& byte = frame->next_bytecode();
//printf("[%d] %s (%d)\n", frame->stack_size(), OP_NAMES[byte.op], byte.arg);
//printf("%s\n", frame->code->src->getLine(byte.line).c_str());
switch (byte.op)
{
case OP_NO_OP: break; // do nothing
case OP_LOAD_CONST: frame->push(frame->code->co_consts[byte.arg]); break;
case OP_LOAD_LAMBDA: {
PyVar obj = frame->code->co_consts[byte.arg];
setattr(obj, __module__, frame->_module);
frame->push(obj);
} break;
case OP_LOAD_NAME_REF: {
frame->push(PyRef(NameRef(frame->code->co_names[byte.arg])));
} break;
case OP_LOAD_NAME: {
frame->push(NameRef(frame->code->co_names[byte.arg]).get(this, frame));
} break;
case OP_STORE_NAME: {
const auto& p = frame->code->co_names[byte.arg];
NameRef(p).set(this, frame, frame->pop_value(this));
} break;
case OP_BUILD_ATTR_REF: {
const auto& attr = frame->code->co_names[byte.arg];
PyVar obj = frame->pop_value(this);
frame->push(PyRef(AttrRef(obj, NameRef(attr))));
} break;
case OP_BUILD_INDEX_REF: {
PyVar index = frame->pop_value(this);
PyVarRef obj = frame->pop_value(this);
frame->push(PyRef(IndexRef(obj, index)));
} break;
case OP_STORE_REF: {
PyVar obj = frame->pop_value(this);
PyVarRef r = frame->pop();
PyRef_AS_C(r)->set(this, frame, std::move(obj));
} break;
case OP_DELETE_REF: {
PyVarRef r = frame->pop();
PyRef_AS_C(r)->del(this, frame);
} break;
case OP_BUILD_SMART_TUPLE:
{
pkpy::ArgList items = frame->pop_n_reversed(byte.arg);
bool done = false;
for(int i=0; i<items.size(); i++){
if(!items[i]->is_type(_tp_ref)) {
done = true;
PyVarList values = items.toList();
for(int j=i; j<values.size(); j++) frame->try_deref(this, values[j]);
frame->push(PyTuple(values));
break;
}
}
if(done) break;
frame->push(PyRef(TupleRef(items.toList())));
} break;
case OP_BUILD_STRING:
{
pkpy::ArgList items = frame->pop_n_values_reversed(this, byte.arg);
_StrStream ss;
for(int i=0; i<items.size(); i++) ss << PyStr_AS_C(asStr(items[i]));
frame->push(PyStr(ss.str()));
} break;
case OP_LOAD_EVAL_FN: {
frame->push(builtins->attribs[m_eval]);
} break;
case OP_LIST_APPEND: {
pkpy::ArgList args(2);
args[1] = frame->pop_value(this); // obj
args[0] = frame->top_value_offset(this, -2); // list
fast_call(m_append, std::move(args));
} break;
case OP_STORE_FUNCTION:
{
PyVar obj = frame->pop_value(this);
const _Func& fn = PyFunction_AS_C(obj);
setattr(obj, __module__, frame->_module);
frame->f_globals()[fn->name] = obj;
} break;
case OP_BUILD_CLASS:
{
const _Str& clsName = frame->code->co_names[byte.arg].first;
PyVar clsBase = frame->pop_value(this);
if(clsBase == None) clsBase = _tp_object;
check_type(clsBase, _tp_type);
PyVar cls = new_user_type_object(frame->_module, clsName, clsBase);
while(true){
PyVar fn = frame->pop_value(this);
if(fn == None) break;
const _Func& f = PyFunction_AS_C(fn);
setattr(fn, __module__, frame->_module);
setattr(cls, f->name, fn);
}
} break;
case OP_RETURN_VALUE: return frame->pop_value(this);
case OP_PRINT_EXPR:
{
const PyVar expr = frame->top_value(this);
if(expr == None) break;
*_stdout << PyStr_AS_C(asRepr(expr)) << '\n';
} break;
case OP_POP_TOP: frame->pop(); break;
case OP_BINARY_OP:
{
pkpy::ArgList args(2);
args._index(1) = frame->pop_value(this);
args._index(0) = frame->top_value(this);
frame->top() = fast_call(BINARY_SPECIAL_METHODS[byte.arg], std::move(args));
} break;
case OP_BITWISE_OP:
{
frame->push(
fast_call(BITWISE_SPECIAL_METHODS[byte.arg],
frame->pop_n_values_reversed(this, 2))
);
} break;
case OP_COMPARE_OP:
{
// for __ne__ we use the negation of __eq__
int op = byte.arg == 3 ? 2 : byte.arg;
PyVar res = fast_call(CMP_SPECIAL_METHODS[op], frame->pop_n_values_reversed(this, 2));
if(op != byte.arg) res = PyBool(!PyBool_AS_C(res));
frame->push(std::move(res));
} break;
case OP_IS_OP:
{
bool ret_c = frame->pop_value(this) == frame->pop_value(this);
if(byte.arg == 1) ret_c = !ret_c;
frame->push(PyBool(ret_c));
} break;
case OP_CONTAINS_OP:
{
PyVar rhs = frame->pop_value(this);
bool ret_c = PyBool_AS_C(call(rhs, __contains__, pkpy::oneArg(frame->pop_value(this))));
if(byte.arg == 1) ret_c = !ret_c;
frame->push(PyBool(ret_c));
} break;
case OP_UNARY_NEGATIVE:
{
PyVar obj = frame->pop_value(this);
frame->push(num_negated(obj));
} break;
case OP_UNARY_NOT:
{
PyVar obj = frame->pop_value(this);
const PyVar& obj_bool = asBool(obj);
frame->push(PyBool(!PyBool_AS_C(obj_bool)));
} break;
case OP_POP_JUMP_IF_FALSE:
if(!PyBool_AS_C(asBool(frame->pop_value(this)))) frame->jump_abs(byte.arg);
break;
case OP_LOAD_NONE: frame->push(None); break;
case OP_LOAD_TRUE: frame->push(True); break;
case OP_LOAD_FALSE: frame->push(False); break;
case OP_LOAD_ELLIPSIS: frame->push(Ellipsis); break;
case OP_ASSERT:
{
PyVar expr = frame->pop_value(this);
if(asBool(expr) != True) _error("AssertionError", "");
} break;
case OP_RAISE_ERROR:
{
_Str msg = PyStr_AS_C(asRepr(frame->pop_value(this)));
_Str type = PyStr_AS_C(frame->pop_value(this));
_error(type, msg);
} break;
case OP_BUILD_LIST:
{
frame->push(PyList(
frame->pop_n_values_reversed_unlimited(this, byte.arg)
));
} break;
case OP_BUILD_MAP:
{
PyVarList items = frame->pop_n_values_reversed_unlimited(this, byte.arg*2);
PyVar obj = call(builtins->attribs["dict"]);
for(int i=0; i<items.size(); i+=2){
call(obj, __setitem__, pkpy::twoArgs(items[i], items[i+1]));
}
frame->push(obj);
} break;
case OP_BUILD_SET:
{
PyVar list = PyList(
frame->pop_n_values_reversed_unlimited(this, byte.arg)
);
PyVar obj = call(builtins->attribs["set"], pkpy::oneArg(list));
frame->push(obj);
} break;
case OP_DUP_TOP: frame->push(frame->top_value(this)); break;
case OP_CALL:
{
int ARGC = byte.arg & 0xFFFF;
int KWARGC = (byte.arg >> 16) & 0xFFFF;
pkpy::ArgList kwargs(0);
if(KWARGC > 0) kwargs = frame->pop_n_values_reversed(this, KWARGC*2);
pkpy::ArgList args = frame->pop_n_values_reversed(this, ARGC);
PyVar callable = frame->pop_value(this);
PyVar ret = call(callable, std::move(args), kwargs, true);
if(ret == __py2py_call_signal) return ret;
frame->push(std::move(ret));
} break;
case OP_JUMP_ABSOLUTE: frame->jump_abs(byte.arg); break;
case OP_SAFE_JUMP_ABSOLUTE: frame->jump_abs_safe(byte.arg); break;
case OP_GOTO: {
PyVar obj = frame->pop_value(this);
const _Str& label = PyStr_AS_C(obj);
int* target = frame->code->co_labels.try_get(label);
if(target == nullptr){
_error("KeyError", "label '" + label + "' not found");
}
frame->jump_abs_safe(*target);
} break;
case OP_GET_ITER:
{
PyVar obj = frame->pop_value(this);
PyVarOrNull iter_fn = getattr(obj, __iter__, false);
if(iter_fn != nullptr){
PyVar tmp = call(iter_fn);
PyVarRef var = frame->pop();
check_type(var, _tp_ref);
PyIter_AS_C(tmp)->var = var;
frame->push(std::move(tmp));
}else{
typeError("'" + UNION_TP_NAME(obj) + "' object is not iterable");
}
} break;
case OP_FOR_ITER:
{
// top() must be PyIter, so no need to try_deref()
auto& it = PyIter_AS_C(frame->top());
if(it->hasNext()){
PyRef_AS_C(it->var)->set(this, frame, it->next());
}else{
int blockEnd = frame->code->co_blocks[byte.block].end;
frame->jump_abs_safe(blockEnd);
}
} break;
case OP_LOOP_CONTINUE:
{
int blockStart = frame->code->co_blocks[byte.block].start;
frame->jump_abs(blockStart);
} break;
case OP_LOOP_BREAK:
{
int blockEnd = frame->code->co_blocks[byte.block].end;
frame->jump_abs_safe(blockEnd);
} break;
case OP_JUMP_IF_FALSE_OR_POP:
{
const PyVar expr = frame->top_value(this);
if(asBool(expr)==False) frame->jump_abs(byte.arg);
else frame->pop_value(this);
} break;
case OP_JUMP_IF_TRUE_OR_POP:
{
const PyVar expr = frame->top_value(this);
if(asBool(expr)==True) frame->jump_abs(byte.arg);
else frame->pop_value(this);
} break;
case OP_BUILD_SLICE:
{
PyVar stop = frame->pop_value(this);
PyVar start = frame->pop_value(this);
_Slice s;
if(start != None) {check_type(start, _tp_int); s.start = (int)PyInt_AS_C(start);}
if(stop != None) {check_type(stop, _tp_int); s.stop = (int)PyInt_AS_C(stop);}
frame->push(PySlice(s));
} break;
case OP_IMPORT_NAME:
{
const _Str& name = frame->code->co_names[byte.arg].first;
auto it = _modules.find(name);
if(it == _modules.end()){
auto it2 = _lazy_modules.find(name);
if(it2 == _lazy_modules.end()){
_error("ImportError", "module '" + name + "' not found");
}else{
const _Str& source = it2->second;
_Code code = compile(source, name, EXEC_MODE);
PyVar _m = newModule(name);
_exec(code, _m, {});
frame->push(_m);
_lazy_modules.erase(it2);
}
}else{
frame->push(it->second);
}
} break;
// TODO: using "goto" inside with block may cause __exit__ not called
case OP_WITH_ENTER: call(frame->pop_value(this), __enter__); break;
case OP_WITH_EXIT: call(frame->pop_value(this), __exit__); break;
default:
throw std::runtime_error(_Str("opcode ") + OP_NAMES[byte.op] + " is not implemented");
break;
}
}
if(frame->code->src->mode == EVAL_MODE || frame->code->src->mode == JSON_MODE){
if(frame->stack_size() != 1) throw std::runtime_error("stack size is not 1 in EVAL_MODE/JSON_MODE");
return frame->pop_value(this);
}
if(frame->stack_size() != 0) throw std::runtime_error("stack not empty in EXEC_MODE");
return None;
}
public:
PyVarDict _types;
PyVarDict _userTypes;
PyVar None, True, False, Ellipsis;
bool use_stdio;
std::ostream* _stdout;
std::ostream* _stderr;
PyVar builtins; // builtins module
PyVar _main; // __main__ module
int maxRecursionDepth = 1000;
VM(bool use_stdio){
this->use_stdio = use_stdio;
if(use_stdio){
std::cout.setf(std::ios::unitbuf);
std::cerr.setf(std::ios::unitbuf);
this->_stdout = &std::cout;
this->_stderr = &std::cerr;
}else{
this->_stdout = new _StrStream();
this->_stderr = new _StrStream();
}
initializeBuiltinClasses();
_small_integers.reserve(270);
for(i64 i=-5; i<=256; i++) _small_integers.push_back(new_object(_tp_int, i));
}
PyVar asStr(const PyVar& obj){
PyVarOrNull str_fn = getattr(obj, __str__, false);
if(str_fn != nullptr) return call(str_fn);
return asRepr(obj);
}
inline Frame* top_frame() const {
if(callstack.empty()) UNREACHABLE();
return callstack.back().get();
}
PyVar asRepr(const PyVar& obj){
if(obj->is_type(_tp_type)) return PyStr("<class '" + UNION_GET(_Str, obj->attribs[__name__]) + "'>");
return call(obj, __repr__);
}
PyVar asJson(const PyVar& obj){
return call(obj, __json__);
}
const PyVar& asBool(const PyVar& obj){
if(obj == None) return False;
if(obj->is_type(_tp_bool)) return obj;
if(obj->is_type(_tp_int)) return PyBool(PyInt_AS_C(obj) != 0);
if(obj->is_type(_tp_float)) return PyBool(PyFloat_AS_C(obj) != 0.0);
PyVarOrNull len_fn = getattr(obj, __len__, false);
if(len_fn != nullptr){
PyVar ret = call(len_fn);
return PyBool(PyInt_AS_C(ret) > 0);
}
return True;
}
PyVar fast_call(const _Str& name, pkpy::ArgList&& args){
PyObject* cls = args[0]->_type.get();
while(cls != None.get()) {
PyVar* val = cls->attribs.try_get(name);
if(val != nullptr) return call(*val, std::move(args));
cls = cls->attribs[__base__].get();
}
attributeError(args[0], name);
return nullptr;
}
inline PyVar call(const PyVar& _callable){
return call(_callable, pkpy::noArg(), pkpy::noArg(), false);
}
template<typename ArgT>
inline std::enable_if_t<std::is_same_v<std::remove_const_t<std::remove_reference_t<ArgT>>, pkpy::ArgList>, PyVar>
call(const PyVar& _callable, ArgT&& args){
return call(_callable, std::forward<ArgT>(args), pkpy::noArg(), false);
}
template<typename ArgT>
inline std::enable_if_t<std::is_same_v<std::remove_const_t<std::remove_reference_t<ArgT>>, pkpy::ArgList>, PyVar>
call(const PyVar& obj, const _Str& func, ArgT&& args){
return call(getattr(obj, func), std::forward<ArgT>(args), pkpy::noArg(), false);
}
inline PyVar call(const PyVar& obj, const _Str& func){
return call(getattr(obj, func), pkpy::noArg(), pkpy::noArg(), false);
}
PyVar call(const PyVar& _callable, pkpy::ArgList args, const pkpy::ArgList& kwargs, bool opCall){
if(_callable->is_type(_tp_type)){
auto it = _callable->attribs.find(__new__);
PyVar obj;
if(it != _callable->attribs.end()){
obj = call(it->second, args, kwargs, false);
}else{
obj = new_object(_callable, DUMMY_VAL);
PyVarOrNull init_fn = getattr(obj, __init__, false);
if (init_fn != nullptr) call(init_fn, args, kwargs, false);
}
return obj;
}
const PyVar* callable = &_callable;
if((*callable)->is_type(_tp_bounded_method)){
auto& bm = PyBoundedMethod_AS_C((*callable));
// TODO: avoid insertion here, bad performance
pkpy::ArgList new_args(args.size()+1);
new_args[0] = bm.obj;
for(int i=0; i<args.size(); i++) new_args[i+1] = args[i];
callable = &bm.method;
args = std::move(new_args);
}
if((*callable)->is_type(_tp_native_function)){
const auto& f = UNION_GET(_CppFunc, *callable);
// _CppFunc do not support kwargs
return f(this, args);
} else if((*callable)->is_type(_tp_function)){
const _Func& fn = PyFunction_AS_C((*callable));
PyVarDict locals;
int i = 0;
for(const auto& name : fn->args){
if(i < args.size()){
locals.emplace(name, args[i++]);
continue;
}
typeError("missing positional argument '" + name + "'");
}
locals.insert(fn->kwArgs.begin(), fn->kwArgs.end());
std::vector<_Str> positional_overrided_keys;
if(!fn->starredArg.empty()){
// handle *args
PyVarList vargs;
while(i < args.size()) vargs.push_back(args[i++]);
locals.emplace(fn->starredArg, PyTuple(std::move(vargs)));
}else{
for(const auto& key : fn->kwArgsOrder){
if(i < args.size()){
locals[key] = args[i++];
positional_overrided_keys.push_back(key);
}else{
break;
}
}
if(i < args.size()) typeError("too many arguments");
}
for(int i=0; i<kwargs.size(); i+=2){
const _Str& key = PyStr_AS_C(kwargs[i]);
if(!fn->kwArgs.contains(key)){
typeError(key.__escape(true) + " is an invalid keyword argument for " + fn->name + "()");
}
const PyVar& val = kwargs[i+1];
if(!positional_overrided_keys.empty()){
auto it = std::find(positional_overrided_keys.begin(), positional_overrided_keys.end(), key);
if(it != positional_overrided_keys.end()){
typeError("multiple values for argument '" + key + "'");
}
}
locals[key] = val;
}
PyVar* it_m = (*callable)->attribs.try_get(__module__);
PyVar _module = it_m != nullptr ? *it_m : top_frame()->_module;
if(opCall){
__pushNewFrame(fn->code, _module, std::move(locals));
return __py2py_call_signal;
}
return _exec(fn->code, _module, std::move(locals));
}
typeError("'" + UNION_TP_NAME(*callable) + "' object is not callable");
return None;
}
// repl mode is only for setting `frame->id` to 0
virtual PyVarOrNull exec(_Str source, _Str filename, CompileMode mode, PyVar _module=nullptr){
if(_module == nullptr) _module = _main;
try {
_Code code = compile(source, filename, mode);
//if(filename != "<builtins>") std::cout << disassemble(code) << std::endl;
return _exec(code, _module, {});
}catch (const _Error& e){
*_stderr << e.what() << '\n';
}
catch (const std::exception& e) {
auto re = RuntimeError("UnexpectedError", e.what(), _cleanErrorAndGetSnapshots());
*_stderr << re.what() << '\n';
}
return nullptr;
}
Frame* __pushNewFrame(const _Code& code, PyVar _module, PyVarDict&& locals){
if(code == nullptr) UNREACHABLE();
if(callstack.size() > maxRecursionDepth){
throw RuntimeError("RecursionError", "maximum recursion depth exceeded", _cleanErrorAndGetSnapshots());
}
Frame* frame = new Frame(code, _module, std::move(locals));
callstack.emplace_back(frame);
return frame;
}
PyVar _exec(_Code code, PyVar _module, PyVarDict&& locals){
Frame* frame = __pushNewFrame(code, _module, std::move(locals));
Frame* frameBase = frame;
PyVar ret = nullptr;
while(true){
ret = run_frame(frame);
if(ret != __py2py_call_signal){
if(frame == frameBase){ // [ frameBase<- ]
break;
}else{
callstack.pop_back();
frame = callstack.back().get();
frame->push(ret);
}
}else{
frame = callstack.back().get(); // [ frameBase, newFrame<- ]
}
}
callstack.pop_back();
return ret;
}
PyVar new_user_type_object(PyVar mod, _Str name, PyVar base){
PyVar obj = pkpy::make_shared<PyObject, Py_<i64>>((i64)1, _tp_type);
setattr(obj, __base__, base);
_Str fullName = UNION_NAME(mod) + "." +name;
setattr(obj, __name__, PyStr(fullName));
_userTypes[fullName] = obj;
setattr(mod, name, obj);
return obj;
}
PyVar new_type_object(_Str name, PyVar base=nullptr) {
if(base == nullptr) base = _tp_object;
PyVar obj = pkpy::make_shared<PyObject, Py_<i64>>((i64)0, _tp_type);
setattr(obj, __base__, base);
_types[name] = obj;
return obj;
}
template<typename T>
inline PyVar new_object(PyVar type, T _value) {
if(!type->is_type(_tp_type)) UNREACHABLE();
return pkpy::make_shared<PyObject, Py_<T>>(_value, type);
}
PyVar newModule(_Str name) {
PyVar obj = new_object(_tp_module, (i64)-2);
setattr(obj, __name__, PyStr(name));
_modules[name] = obj;
return obj;
}
void addLazyModule(_Str name, _Str source){
_lazy_modules[name] = source;
}
PyVarOrNull getattr(const PyVar& obj, const _Str& name, bool throw_err=true) {
PyVarDict::iterator it;
PyObject* cls;
if(obj->is_type(_tp_super)){
const PyVar* root = &obj;
int depth = 1;
while(true){
root = &UNION_GET(PyVar, *root);
if(!(*root)->is_type(_tp_super)) break;
depth++;
}
cls = (*root)->_type.get();
for(int i=0; i<depth; i++) cls = cls->attribs[__base__].get();
it = (*root)->attribs.find(name);
if(it != (*root)->attribs.end()) return it->second;
}else{
it = obj->attribs.find(name);
if(it != obj->attribs.end()) return it->second;
cls = obj->_type.get();
}
while(cls != None.get()) {
it = cls->attribs.find(name);
if(it != cls->attribs.end()){
PyVar valueFromCls = it->second;
if(valueFromCls->is_type(_tp_function) || valueFromCls->is_type(_tp_native_function)){
return PyBoundedMethod({obj, std::move(valueFromCls)});
}else{
return valueFromCls;
}
}
cls = cls->attribs[__base__].get();
}
if(throw_err) attributeError(obj, name);
return nullptr;
}
template<typename T>
void setattr(PyObject* obj, const _Str& name, T&& value) {
while(obj->is_type(_tp_super)) obj = ((Py_<PyVar>*)obj)->_valueT.get();
obj->attribs[name] = value;
}
template<typename T>
inline void setattr(PyVar& obj, const _Str& name, T&& value) {
setattr(obj.get(), name, value);
}
void bindMethod(_Str typeName, _Str funcName, _CppFunc fn) {
PyVar* type = _types.try_get(typeName);
if(type == nullptr) type = _userTypes.try_get(typeName);
if(type == nullptr) UNREACHABLE();
PyVar func = PyNativeFunction(fn);
setattr(*type, funcName, func);
}
void bindMethodMulti(std::vector<_Str> typeNames, _Str funcName, _CppFunc fn) {
for(auto& typeName : typeNames){
bindMethod(typeName, funcName, fn);
}
}
void bindBuiltinFunc(_Str funcName, _CppFunc fn) {
bindFunc(builtins, funcName, fn);
}
void bindFunc(PyVar module, _Str funcName, _CppFunc fn) {
check_type(module, _tp_module);
PyVar func = PyNativeFunction(fn);
setattr(module, funcName, func);
}
inline bool is_int_or_float(const PyVar& obj) const{
return obj->is_type(_tp_int) || obj->is_type(_tp_float);
}
inline bool is_int_or_float(const PyVar& obj1, const PyVar& obj2) const{
return is_int_or_float(obj1) && is_int_or_float(obj2);
}
inline f64 num_to_float(const PyVar& obj){
if (obj->is_type(_tp_int)){
return (f64)PyInt_AS_C(obj);
}else if(obj->is_type(_tp_float)){
return PyFloat_AS_C(obj);
}
typeError("expected int or float");
return 0;
}
PyVar num_negated(const PyVar& obj){
if (obj->is_type(_tp_int)){
return PyInt(-PyInt_AS_C(obj));
}else if(obj->is_type(_tp_float)){
return PyFloat(-PyFloat_AS_C(obj));
}
typeError("unsupported operand type(s) for -");
return nullptr;
}
int normalizedIndex(int index, int size){
if(index < 0) index += size;
if(index < 0 || index >= size){
indexError("index out of range, " + std::to_string(index) + " not in [0, " + std::to_string(size) + ")");
}
return index;
}
_Str disassemble(_Code code){
std::vector<int> jumpTargets;
for(auto byte : code->co_code){
if(byte.op == OP_JUMP_ABSOLUTE || byte.op == OP_SAFE_JUMP_ABSOLUTE || byte.op == OP_POP_JUMP_IF_FALSE){
jumpTargets.push_back(byte.arg);
}
}
_StrStream ss;
ss << std::string(54, '-') << '\n';
ss << code->name << ":\n";
int prev_line = -1;
for(int i=0; i<code->co_code.size(); i++){
const Bytecode& byte = code->co_code[i];
_Str line = std::to_string(byte.line);
if(byte.line == prev_line) line = "";
else{
if(prev_line != -1) ss << "\n";
prev_line = byte.line;
}
std::string pointer;
if(std::find(jumpTargets.begin(), jumpTargets.end(), i) != jumpTargets.end()){
pointer = "-> ";
}else{
pointer = " ";
}
ss << pad(line, 8) << pointer << pad(std::to_string(i), 3);
ss << " " << pad(OP_NAMES[byte.op], 20) << " ";
// ss << pad(byte.arg == -1 ? "" : std::to_string(byte.arg), 5);
std::string argStr = byte.arg == -1 ? "" : std::to_string(byte.arg);
if(byte.op == OP_LOAD_CONST){
argStr += " (" + PyStr_AS_C(asRepr(code->co_consts[byte.arg])) + ")";
}
if(byte.op == OP_LOAD_NAME_REF || byte.op == OP_LOAD_NAME){
argStr += " (" + code->co_names[byte.arg].first.__escape(true) + ")";
}
ss << pad(argStr, 20); // may overflow
ss << code->co_blocks[byte.block].to_string();
if(i != code->co_code.size() - 1) ss << '\n';
}
_StrStream consts;
consts << "co_consts: ";
consts << PyStr_AS_C(asRepr(PyList(code->co_consts)));
_StrStream names;
names << "co_names: ";
PyVarList list;
for(int i=0; i<code->co_names.size(); i++){
list.push_back(PyStr(code->co_names[i].first));
}
names << PyStr_AS_C(asRepr(PyList(list)));
ss << '\n' << consts.str() << '\n' << names.str() << '\n';
for(int i=0; i<code->co_consts.size(); i++){
PyVar obj = code->co_consts[i];
if(obj->is_type(_tp_function)){
const auto& f = PyFunction_AS_C(obj);
ss << disassemble(f->code);
}
}
return _Str(ss.str());
}
// for quick access
PyVar _tp_object, _tp_type, _tp_int, _tp_float, _tp_bool, _tp_str;
PyVar _tp_list, _tp_tuple;
PyVar _tp_function, _tp_native_function, _tp_native_iterator, _tp_bounded_method;
PyVar _tp_slice, _tp_range, _tp_module, _tp_ref;
PyVar _tp_super;
template<typename P>
inline PyVarRef PyRef(P&& value) {
static_assert(std::is_base_of<BaseRef, P>::value, "P should derive from BaseRef");
return new_object(_tp_ref, std::forward<P>(value));
}
inline const BaseRef* PyRef_AS_C(const PyVar& obj)
{
if(!obj->is_type(_tp_ref)) typeError("expected an l-value");
return (const BaseRef*)(obj->value());
}
__DEF_PY_AS_C(Int, i64, _tp_int)
inline PyVar PyInt(i64 value) {
if(value >= -5 && value <= 256) return _small_integers[value + 5];
return new_object(_tp_int, value);
}
DEF_NATIVE(Float, f64, _tp_float)
DEF_NATIVE(Str, _Str, _tp_str)
DEF_NATIVE(List, PyVarList, _tp_list)
DEF_NATIVE(Tuple, PyVarList, _tp_tuple)
DEF_NATIVE(Function, _Func, _tp_function)
DEF_NATIVE(NativeFunction, _CppFunc, _tp_native_function)
DEF_NATIVE(Iter, _Iterator, _tp_native_iterator)
DEF_NATIVE(BoundedMethod, _BoundedMethod, _tp_bounded_method)
DEF_NATIVE(Range, _Range, _tp_range)
DEF_NATIVE(Slice, _Slice, _tp_slice)
// there is only one True/False, so no need to copy them!
inline bool PyBool_AS_C(const PyVar& obj){return obj == True;}
inline const PyVar& PyBool(bool value){return value ? True : False;}
void initializeBuiltinClasses(){
_tp_object = pkpy::make_shared<PyObject, Py_<i64>>((i64)0, nullptr);
_tp_type = pkpy::make_shared<PyObject, Py_<i64>>((i64)0, nullptr);
_types["object"] = _tp_object;
_types["type"] = _tp_type;
_tp_bool = new_type_object("bool");
_tp_int = new_type_object("int");
_tp_float = new_type_object("float");
_tp_str = new_type_object("str");
_tp_list = new_type_object("list");
_tp_tuple = new_type_object("tuple");
_tp_slice = new_type_object("slice");
_tp_range = new_type_object("range");
_tp_module = new_type_object("module");
_tp_ref = new_type_object("_ref");
new_type_object("NoneType");
new_type_object("ellipsis");
_tp_function = new_type_object("function");
_tp_native_function = new_type_object("_native_function");
_tp_native_iterator = new_type_object("_native_iterator");
_tp_bounded_method = new_type_object("_bounded_method");
_tp_super = new_type_object("super");
this->None = new_object(_types["NoneType"], (i64)0);
this->Ellipsis = new_object(_types["ellipsis"], (i64)0);
this->True = new_object(_tp_bool, true);
this->False = new_object(_tp_bool, false);
this->builtins = newModule("builtins");
this->_main = newModule("__main__");
setattr(_tp_type, __base__, _tp_object);
_tp_type->_type = _tp_type;
setattr(_tp_object, __base__, None);
_tp_object->_type = _tp_type;
for (auto& [name, type] : _types) {
setattr(type, __name__, PyStr(name));
}
this->__py2py_call_signal = new_object(_tp_object, (i64)7);
std::vector<_Str> publicTypes = {"type", "object", "bool", "int", "float", "str", "list", "tuple", "range"};
for (auto& name : publicTypes) {
setattr(builtins, name, _types[name]);
}
}
i64 hash(const PyVar& obj){
if (obj->is_type(_tp_int)) return PyInt_AS_C(obj);
if (obj->is_type(_tp_bool)) return PyBool_AS_C(obj) ? 1 : 0;
if (obj->is_type(_tp_float)){
f64 val = PyFloat_AS_C(obj);
return (i64)std::hash<f64>()(val);
}
if (obj->is_type(_tp_str)) return PyStr_AS_C(obj).hash();
if (obj->is_type(_tp_type)) return (i64)obj.get();
if (obj->is_type(_tp_tuple)) {
i64 x = 1000003;
for (const auto& item : PyTuple_AS_C(obj)) {
i64 y = hash(item);
x = x ^ (y + 0x9e3779b9 + (x << 6) + (x >> 2)); // recommended by Github Copilot
}
return x;
}
typeError("unhashable type: " + UNION_TP_NAME(obj));
return 0;
}
/***** Error Reporter *****/
private:
void _error(const _Str& name, const _Str& msg){
throw RuntimeError(name, msg, _cleanErrorAndGetSnapshots());
}
std::stack<_Str> _cleanErrorAndGetSnapshots(){
std::stack<_Str> snapshots;
while (!callstack.empty()){
if(snapshots.size() < 8){
snapshots.push(callstack.back()->curr_snapshot());
}
callstack.pop_back();
}
return snapshots;
}
public:
void typeError(const _Str& msg){ _error("TypeError", msg); }
void zeroDivisionError(){ _error("ZeroDivisionError", "division by zero"); }
void indexError(const _Str& msg){ _error("IndexError", msg); }
void valueError(const _Str& msg){ _error("ValueError", msg); }
void nameError(const _Str& name){ _error("NameError", "name '" + name + "' is not defined"); }
void attributeError(PyVar obj, const _Str& name){
_error("AttributeError", "type '" + UNION_TP_NAME(obj) + "' has no attribute '" + name + "'");
}
inline void check_type(const PyVar& obj, const PyVar& type){
if(!obj->is_type(type)) typeError("expected '" + UNION_NAME(type) + "', but got '" + UNION_TP_NAME(obj) + "'");
}
inline void check_args_size(const pkpy::ArgList& args, int size, bool method=false){
if(args.size() == size) return;
if(method) typeError(args.size()>size ? "too many arguments" : "too few arguments");
else typeError("expected " + std::to_string(size) + " arguments, but got " + std::to_string(args.size()));
}
virtual ~VM() {
if(!use_stdio){
delete _stdout;
delete _stderr;
}
}
_Code compile(_Str source, _Str filename, CompileMode mode);
};
/***** Pointers' Impl *****/
PyVar NameRef::get(VM* vm, Frame* frame) const{
PyVar* val;
val = frame->f_locals.try_get(pair->first);
if(val) return *val;
val = frame->f_globals().try_get(pair->first);
if(val) return *val;
val = vm->builtins->attribs.try_get(pair->first);
if(val) return *val;
vm->nameError(pair->first);
return nullptr;
}
void NameRef::set(VM* vm, Frame* frame, PyVar val) const{
switch(pair->second) {
case NAME_LOCAL: frame->f_locals[pair->first] = std::move(val); break;
case NAME_GLOBAL:
{
PyVar* existing = frame->f_locals.try_get(pair->first);
if(existing != nullptr){
*existing = std::move(val);
}else{
frame->f_globals()[pair->first] = std::move(val);
}
} break;
default: UNREACHABLE();
}
}
void NameRef::del(VM* vm, Frame* frame) const{
switch(pair->second) {
case NAME_LOCAL: {
if(frame->f_locals.contains(pair->first)){
frame->f_locals.erase(pair->first);
}else{
vm->nameError(pair->first);
}
} break;
case NAME_GLOBAL:
{
if(frame->f_locals.contains(pair->first)){
frame->f_locals.erase(pair->first);
}else{
if(frame->f_globals().contains(pair->first)){
frame->f_globals().erase(pair->first);
}else{
vm->nameError(pair->first);
}
}
} break;
default: UNREACHABLE();
}
}
PyVar AttrRef::get(VM* vm, Frame* frame) const{
return vm->getattr(obj, attr.pair->first);
}
void AttrRef::set(VM* vm, Frame* frame, PyVar val) const{
vm->setattr(obj, attr.pair->first, val);
}
void AttrRef::del(VM* vm, Frame* frame) const{
vm->typeError("cannot delete attribute");
}
PyVar IndexRef::get(VM* vm, Frame* frame) const{
return vm->call(obj, __getitem__, pkpy::oneArg(index));
}
void IndexRef::set(VM* vm, Frame* frame, PyVar val) const{
vm->call(obj, __setitem__, pkpy::twoArgs(index, val));
}
void IndexRef::del(VM* vm, Frame* frame) const{
vm->call(obj, __delitem__, pkpy::oneArg(index));
}
PyVar TupleRef::get(VM* vm, Frame* frame) const{
PyVarList args(varRefs.size());
for (int i = 0; i < varRefs.size(); i++) {
args[i] = vm->PyRef_AS_C(varRefs[i])->get(vm, frame);
}
return vm->PyTuple(args);
}
void TupleRef::set(VM* vm, Frame* frame, PyVar val) const{
if(!val->is_type(vm->_tp_tuple) && !val->is_type(vm->_tp_list)){
vm->typeError("only tuple or list can be unpacked");
}
const PyVarList& args = UNION_GET(PyVarList, val);
if(args.size() > varRefs.size()) vm->valueError("too many values to unpack");
if(args.size() < varRefs.size()) vm->valueError("not enough values to unpack");
for (int i = 0; i < varRefs.size(); i++) {
vm->PyRef_AS_C(varRefs[i])->set(vm, frame, args[i]);
}
}
void TupleRef::del(VM* vm, Frame* frame) const{
for (auto& r : varRefs) vm->PyRef_AS_C(r)->del(vm, frame);
}
/***** Frame's Impl *****/
inline void Frame::try_deref(VM* vm, PyVar& v){
if(v->is_type(vm->_tp_ref)) v = vm->PyRef_AS_C(v)->get(vm, this);
}
/***** Iterators' Impl *****/
PyVar RangeIterator::next(){
PyVar val = vm->PyInt(current);
current += r.step;
return val;
}
PyVar StringIterator::next(){
return vm->PyStr(str.u8_getitem(index++));
}
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