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Copy pathframe.rs
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2558 lines (2376 loc) · 99.7 KB
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use crate::{
AsObject, Py, PyObject, PyObjectRef, PyPayload, PyRef, PyResult, TryFromObject, VirtualMachine,
builtins::{
PyBaseExceptionRef, PyCode, PyCoroutine, PyDict, PyDictRef, PyGenerator, PyList, PySet,
PySlice, PyStr, PyStrInterned, PyStrRef, PyTraceback, PyType,
asyncgenerator::PyAsyncGenWrappedValue,
function::{PyCell, PyCellRef, PyFunction},
tuple::{PyTuple, PyTupleRef},
},
bytecode,
convert::{IntoObject, ToPyResult},
coroutine::Coro,
exceptions::ExceptionCtor,
function::{ArgMapping, Either, FuncArgs},
protocol::{PyIter, PyIterReturn},
scope::Scope,
stdlib::{builtins, typing},
types::PyTypeFlags,
vm::{Context, PyMethod},
};
use indexmap::IndexMap;
use itertools::Itertools;
use rustpython_common::{boxvec::BoxVec, lock::PyMutex, wtf8::Wtf8Buf};
use rustpython_compiler_core::SourceLocation;
#[cfg(feature = "threading")]
use std::sync::atomic;
use std::{fmt, iter::zip};
#[derive(Clone, Debug)]
struct Block {
/// The type of block.
typ: BlockType,
/// The level of the value stack when the block was entered.
level: usize,
}
#[derive(Clone, Debug)]
enum BlockType {
Loop,
TryExcept {
handler: bytecode::Label,
},
Finally {
handler: bytecode::Label,
},
/// Active finally sequence
FinallyHandler {
reason: Option<UnwindReason>,
prev_exc: Option<PyBaseExceptionRef>,
},
ExceptHandler {
prev_exc: Option<PyBaseExceptionRef>,
},
}
pub type FrameRef = PyRef<Frame>;
/// The reason why we might be unwinding a block.
/// This could be return of function, exception being
/// raised, a break or continue being hit, etc..
#[derive(Clone, Debug)]
enum UnwindReason {
/// We are returning a value from a return statement.
Returning { value: PyObjectRef },
/// We hit an exception, so unwind any try-except and finally blocks. The exception should be
/// on top of the vm exception stack.
Raising { exception: PyBaseExceptionRef },
// NoWorries,
/// We are unwinding blocks, since we hit break
Break { target: bytecode::Label },
/// We are unwinding blocks since we hit a continue statements.
Continue { target: bytecode::Label },
}
#[derive(Debug)]
struct FrameState {
// We need 1 stack per frame
/// The main data frame of the stack machine
stack: BoxVec<PyObjectRef>,
/// Block frames, for controlling loops and exceptions
blocks: Vec<Block>,
/// index of last instruction ran
#[cfg(feature = "threading")]
lasti: u32,
}
#[cfg(feature = "threading")]
type Lasti = atomic::AtomicU32;
#[cfg(not(feature = "threading"))]
type Lasti = std::cell::Cell<u32>;
#[pyclass(module = false, name = "frame")]
pub struct Frame {
pub code: PyRef<PyCode>,
pub func_obj: Option<PyObjectRef>,
pub fastlocals: PyMutex<Box<[Option<PyObjectRef>]>>,
pub(crate) cells_frees: Box<[PyCellRef]>,
pub locals: ArgMapping,
pub globals: PyDictRef,
pub builtins: PyDictRef,
// on feature=threading, this is a duplicate of FrameState.lasti, but it's faster to do an
// atomic store than it is to do a fetch_add, for every instruction executed
/// index of last instruction ran
pub lasti: Lasti,
/// tracer function for this frame (usually is None)
pub trace: PyMutex<PyObjectRef>,
state: PyMutex<FrameState>,
// member
pub trace_lines: PyMutex<bool>,
pub temporary_refs: PyMutex<Vec<PyObjectRef>>,
}
impl PyPayload for Frame {
#[inline]
fn class(ctx: &Context) -> &'static Py<PyType> {
ctx.types.frame_type
}
}
// Running a frame can result in one of the below:
pub enum ExecutionResult {
Return(PyObjectRef),
Yield(PyObjectRef),
}
/// A valid execution result, or an exception
type FrameResult = PyResult<Option<ExecutionResult>>;
impl Frame {
pub(crate) fn new(
code: PyRef<PyCode>,
scope: Scope,
builtins: PyDictRef,
closure: &[PyCellRef],
func_obj: Option<PyObjectRef>,
vm: &VirtualMachine,
) -> Self {
let cells_frees = std::iter::repeat_with(|| PyCell::default().into_ref(&vm.ctx))
.take(code.cellvars.len())
.chain(closure.iter().cloned())
.collect();
let state = FrameState {
stack: BoxVec::new(code.max_stackdepth as usize),
blocks: Vec::new(),
#[cfg(feature = "threading")]
lasti: 0,
};
Self {
fastlocals: PyMutex::new(vec![None; code.varnames.len()].into_boxed_slice()),
cells_frees,
locals: scope.locals,
globals: scope.globals,
builtins,
code,
func_obj,
lasti: Lasti::new(0),
state: PyMutex::new(state),
trace: PyMutex::new(vm.ctx.none()),
trace_lines: PyMutex::new(true),
temporary_refs: PyMutex::new(vec![]),
}
}
pub fn current_location(&self) -> SourceLocation {
self.code.locations[self.lasti() as usize - 1]
}
pub fn lasti(&self) -> u32 {
#[cfg(feature = "threading")]
{
self.lasti.load(atomic::Ordering::Relaxed)
}
#[cfg(not(feature = "threading"))]
{
self.lasti.get()
}
}
pub fn locals(&self, vm: &VirtualMachine) -> PyResult<ArgMapping> {
let locals = &self.locals;
let code = &**self.code;
let map = &code.varnames;
let j = std::cmp::min(map.len(), code.varnames.len());
if !code.varnames.is_empty() {
let fastlocals = self.fastlocals.lock();
for (&k, v) in zip(&map[..j], &**fastlocals) {
match locals.mapping().ass_subscript(k, v.clone(), vm) {
Ok(()) => {}
Err(e) if e.fast_isinstance(vm.ctx.exceptions.key_error) => {}
Err(e) => return Err(e),
}
}
}
if !code.cellvars.is_empty() || !code.freevars.is_empty() {
let map_to_dict = |keys: &[&PyStrInterned], values: &[PyCellRef]| {
for (&k, v) in zip(keys, values) {
if let Some(value) = v.get() {
locals.mapping().ass_subscript(k, Some(value), vm)?;
} else {
match locals.mapping().ass_subscript(k, None, vm) {
Ok(()) => {}
Err(e) if e.fast_isinstance(vm.ctx.exceptions.key_error) => {}
Err(e) => return Err(e),
}
}
}
Ok(())
};
map_to_dict(&code.cellvars, &self.cells_frees)?;
if code.flags.contains(bytecode::CodeFlags::IS_OPTIMIZED) {
map_to_dict(&code.freevars, &self.cells_frees[code.cellvars.len()..])?;
}
}
Ok(locals.clone())
}
}
impl Py<Frame> {
#[inline(always)]
fn with_exec<R>(&self, f: impl FnOnce(ExecutingFrame<'_>) -> R) -> R {
let mut state = self.state.lock();
let exec = ExecutingFrame {
code: &self.code,
fastlocals: &self.fastlocals,
cells_frees: &self.cells_frees,
locals: &self.locals,
globals: &self.globals,
builtins: &self.builtins,
lasti: &self.lasti,
object: self,
state: &mut state,
};
f(exec)
}
// #[cfg_attr(feature = "flame-it", flame("Frame"))]
pub fn run(&self, vm: &VirtualMachine) -> PyResult<ExecutionResult> {
self.with_exec(|mut exec| exec.run(vm))
}
pub(crate) fn resume(
&self,
value: Option<PyObjectRef>,
vm: &VirtualMachine,
) -> PyResult<ExecutionResult> {
self.with_exec(|mut exec| {
if let Some(value) = value {
exec.push_value(value)
}
exec.run(vm)
})
}
pub(crate) fn gen_throw(
&self,
vm: &VirtualMachine,
exc_type: PyObjectRef,
exc_val: PyObjectRef,
exc_tb: PyObjectRef,
) -> PyResult<ExecutionResult> {
self.with_exec(|mut exec| exec.gen_throw(vm, exc_type, exc_val, exc_tb))
}
pub fn yield_from_target(&self) -> Option<PyObjectRef> {
self.with_exec(|exec| exec.yield_from_target().map(PyObject::to_owned))
}
pub fn is_internal_frame(&self) -> bool {
let code = self.f_code();
let filename = code.co_filename();
let filename_s = filename.as_str();
filename_s.contains("importlib") && filename_s.contains("_bootstrap")
}
pub fn next_external_frame(&self, vm: &VirtualMachine) -> Option<FrameRef> {
self.f_back(vm).map(|mut back| {
loop {
back = if let Some(back) = back.to_owned().f_back(vm) {
back
} else {
break back;
};
if !back.is_internal_frame() {
break back;
}
}
})
}
}
/// An executing frame; essentially just a struct to combine the immutable data outside the mutex
/// with the mutable data inside
struct ExecutingFrame<'a> {
code: &'a PyRef<PyCode>,
fastlocals: &'a PyMutex<Box<[Option<PyObjectRef>]>>,
cells_frees: &'a [PyCellRef],
locals: &'a ArgMapping,
globals: &'a PyDictRef,
builtins: &'a PyDictRef,
object: &'a Py<Frame>,
lasti: &'a Lasti,
state: &'a mut FrameState,
}
impl fmt::Debug for ExecutingFrame<'_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("ExecutingFrame")
.field("code", self.code)
// .field("scope", self.scope)
.field("state", self.state)
.finish()
}
}
impl ExecutingFrame<'_> {
#[inline(always)]
fn update_lasti(&mut self, f: impl FnOnce(&mut u32)) {
#[cfg(feature = "threading")]
{
f(&mut self.state.lasti);
self.lasti
.store(self.state.lasti, atomic::Ordering::Relaxed);
}
#[cfg(not(feature = "threading"))]
{
let mut lasti = self.lasti.get();
f(&mut lasti);
self.lasti.set(lasti);
}
}
#[inline(always)]
const fn lasti(&self) -> u32 {
#[cfg(feature = "threading")]
{
self.state.lasti
}
#[cfg(not(feature = "threading"))]
{
self.lasti.get()
}
}
fn run(&mut self, vm: &VirtualMachine) -> PyResult<ExecutionResult> {
flame_guard!(format!(
"Frame::run({obj_name})",
obj_name = self.code.obj_name
));
// Execute until return or exception:
let instructions = &self.code.instructions;
let mut arg_state = bytecode::OpArgState::default();
loop {
let idx = self.lasti() as usize;
// eprintln!(
// "location: {:?} {}",
// self.code.locations[idx], self.code.source_path
// );
self.update_lasti(|i| *i += 1);
let bytecode::CodeUnit { op, arg } = instructions[idx];
let arg = arg_state.extend(arg);
let mut do_extend_arg = false;
let result = self.execute_instruction(op, arg, &mut do_extend_arg, vm);
match result {
Ok(None) => {}
Ok(Some(value)) => {
break Ok(value);
}
// Instruction raised an exception
Err(exception) => {
#[cold]
fn handle_exception(
frame: &mut ExecutingFrame<'_>,
exception: PyBaseExceptionRef,
idx: usize,
vm: &VirtualMachine,
) -> FrameResult {
// 1. Extract traceback from exception's '__traceback__' attr.
// 2. Add new entry with current execution position (filename, lineno, code_object) to traceback.
// 3. Unwind block stack till appropriate handler is found.
let loc = frame.code.locations[idx];
let next = exception.__traceback__();
let new_traceback = PyTraceback::new(
next,
frame.object.to_owned(),
frame.lasti(),
loc.line,
);
vm_trace!("Adding to traceback: {:?} {:?}", new_traceback, loc.line);
exception.set_traceback_typed(Some(new_traceback.into_ref(&vm.ctx)));
vm.contextualize_exception(&exception);
frame.unwind_blocks(vm, UnwindReason::Raising { exception })
}
match handle_exception(self, exception, idx, vm) {
Ok(None) => {}
Ok(Some(result)) => break Ok(result),
// TODO: append line number to traceback?
// traceback.append();
Err(exception) => break Err(exception),
}
}
}
if !do_extend_arg {
arg_state.reset()
}
}
}
fn yield_from_target(&self) -> Option<&PyObject> {
if let Some(bytecode::CodeUnit {
op: bytecode::Instruction::YieldFrom,
..
}) = self.code.instructions.get(self.lasti() as usize)
{
Some(self.top_value())
} else {
None
}
}
/// Ok(Err(e)) means that an error occurred while calling throw() and the generator should try
/// sending it
fn gen_throw(
&mut self,
vm: &VirtualMachine,
exc_type: PyObjectRef,
exc_val: PyObjectRef,
exc_tb: PyObjectRef,
) -> PyResult<ExecutionResult> {
if let Some(jen) = self.yield_from_target() {
// borrow checker shenanigans - we only need to use exc_type/val/tb if the following
// variable is Some
let thrower = if let Some(coro) = self.builtin_coro(jen) {
Some(Either::A(coro))
} else {
vm.get_attribute_opt(jen.to_owned(), "throw")?
.map(Either::B)
};
if let Some(thrower) = thrower {
let ret = match thrower {
Either::A(coro) => coro
.throw(jen, exc_type, exc_val, exc_tb, vm)
.to_pyresult(vm), // FIXME:
Either::B(meth) => meth.call((exc_type, exc_val, exc_tb), vm),
};
return ret.map(ExecutionResult::Yield).or_else(|err| {
self.pop_value();
self.update_lasti(|i| *i += 1);
if err.fast_isinstance(vm.ctx.exceptions.stop_iteration) {
let val = vm.unwrap_or_none(err.get_arg(0));
self.push_value(val);
self.run(vm)
} else {
let (ty, val, tb) = vm.split_exception(err);
self.gen_throw(vm, ty, val, tb)
}
});
}
}
let exception = vm.normalize_exception(exc_type, exc_val, exc_tb)?;
match self.unwind_blocks(vm, UnwindReason::Raising { exception }) {
Ok(None) => self.run(vm),
Ok(Some(result)) => Ok(result),
Err(exception) => Err(exception),
}
}
fn unbound_cell_exception(&self, i: usize, vm: &VirtualMachine) -> PyBaseExceptionRef {
if let Some(&name) = self.code.cellvars.get(i) {
vm.new_exception_msg(
vm.ctx.exceptions.unbound_local_error.to_owned(),
format!("local variable '{name}' referenced before assignment"),
)
} else {
let name = self.code.freevars[i - self.code.cellvars.len()];
vm.new_name_error(
format!("free variable '{name}' referenced before assignment in enclosing scope"),
name.to_owned(),
)
}
}
/// Execute a single instruction.
#[inline(always)]
fn execute_instruction(
&mut self,
instruction: bytecode::Instruction,
arg: bytecode::OpArg,
extend_arg: &mut bool,
vm: &VirtualMachine,
) -> FrameResult {
vm.check_signals()?;
flame_guard!(format!(
"Frame::execute_instruction({})",
instruction.display(arg, &self.code.code).to_string()
));
#[cfg(feature = "vm-tracing-logging")]
{
trace!("=======");
/* TODO:
for frame in self.frames.iter() {
trace!(" {:?}", frame);
}
*/
trace!(" {:#?}", self);
trace!(
" Executing op code: {}",
instruction.display(arg, &self.code.code)
);
trace!("=======");
}
#[cold]
fn name_error(name: &'static PyStrInterned, vm: &VirtualMachine) -> PyBaseExceptionRef {
vm.new_name_error(format!("name '{name}' is not defined"), name.to_owned())
}
match instruction {
bytecode::Instruction::BeforeAsyncWith => {
let mgr = self.pop_value();
let error_string = || -> String {
format!(
"'{:.200}' object does not support the asynchronous context manager protocol",
mgr.class().name(),
)
};
let aenter_res = vm
.get_special_method(&mgr, identifier!(vm, __aenter__))?
.ok_or_else(|| vm.new_type_error(error_string()))?
.invoke((), vm)?;
let aexit = mgr
.get_attr(identifier!(vm, __aexit__), vm)
.map_err(|_exc| {
vm.new_type_error({
format!("{} (missed __aexit__ method)", error_string())
})
})?;
self.push_value(aexit);
self.push_value(aenter_res);
Ok(None)
}
bytecode::Instruction::BinaryOp { op } => self.execute_bin_op(vm, op.get(arg)),
bytecode::Instruction::BinarySubscript => {
let key = self.pop_value();
let container = self.pop_value();
self.state
.stack
.push(container.get_item(key.as_object(), vm)?);
Ok(None)
}
bytecode::Instruction::Break { target } => self.unwind_blocks(
vm,
UnwindReason::Break {
target: target.get(arg),
},
),
bytecode::Instruction::BuildListFromTuples { size } => {
// SAFETY: compiler guarantees `size` tuples are on the stack
let elements = unsafe { self.flatten_tuples(size.get(arg) as usize) };
let list_obj = vm.ctx.new_list(elements);
self.push_value(list_obj.into());
Ok(None)
}
bytecode::Instruction::BuildList { size } => {
let elements = self.pop_multiple(size.get(arg) as usize).collect();
let list_obj = vm.ctx.new_list(elements);
self.push_value(list_obj.into());
Ok(None)
}
bytecode::Instruction::BuildMapForCall { size } => {
self.execute_build_map_for_call(vm, size.get(arg))
}
bytecode::Instruction::BuildMap { size } => self.execute_build_map(vm, size.get(arg)),
bytecode::Instruction::BuildSetFromTuples { size } => {
let set = PySet::default().into_ref(&vm.ctx);
for element in self.pop_multiple(size.get(arg) as usize) {
// SAFETY: trust compiler
let tup = unsafe { element.downcast_unchecked::<PyTuple>() };
for item in tup.iter() {
set.add(item.clone(), vm)?;
}
}
self.push_value(set.into());
Ok(None)
}
bytecode::Instruction::BuildSet { size } => {
let set = PySet::default().into_ref(&vm.ctx);
for element in self.pop_multiple(size.get(arg) as usize) {
set.add(element, vm)?;
}
self.push_value(set.into());
Ok(None)
}
bytecode::Instruction::BuildSlice { argc } => {
self.execute_build_slice(vm, argc.get(arg))
}
/*
bytecode::Instruction::ToBool => {
dbg!("Shouldn't be called outside of match statements for now")
let value = self.pop_value();
// call __bool__
let result = value.try_to_bool(vm)?;
self.push_value(vm.ctx.new_bool(result).into());
Ok(None)
}
*/
bytecode::Instruction::BuildString { size } => {
let s = self
.pop_multiple(size.get(arg) as usize)
.as_slice()
.iter()
.map(|pyobj| pyobj.downcast_ref::<PyStr>().unwrap())
.collect::<Wtf8Buf>();
let str_obj = vm.ctx.new_str(s);
self.push_value(str_obj.into());
Ok(None)
}
bytecode::Instruction::BuildTupleFromIter => {
if !self.top_value().class().is(vm.ctx.types.tuple_type) {
let elements: Vec<_> = self.pop_value().try_to_value(vm)?;
let list_obj = vm.ctx.new_tuple(elements);
self.push_value(list_obj.into());
}
Ok(None)
}
bytecode::Instruction::BuildTupleFromTuples { size } => {
// SAFETY: compiler guarantees `size` tuples are on the stack
let elements = unsafe { self.flatten_tuples(size.get(arg) as usize) };
let list_obj = vm.ctx.new_tuple(elements);
self.push_value(list_obj.into());
Ok(None)
}
bytecode::Instruction::BuildTuple { size } => {
let elements = self.pop_multiple(size.get(arg) as usize).collect();
let list_obj = vm.ctx.new_tuple(elements);
self.push_value(list_obj.into());
Ok(None)
}
bytecode::Instruction::CallFunctionEx { has_kwargs } => {
let args = self.collect_ex_args(vm, has_kwargs.get(arg))?;
self.execute_call(args, vm)
}
bytecode::Instruction::CallFunctionKeyword { nargs } => {
let args = self.collect_keyword_args(nargs.get(arg));
self.execute_call(args, vm)
}
bytecode::Instruction::CallFunctionPositional { nargs } => {
let args = self.collect_positional_args(nargs.get(arg));
self.execute_call(args, vm)
}
bytecode::Instruction::CallIntrinsic1 { func } => {
let value = self.pop_value();
let result = self.call_intrinsic_1(func.get(arg), value, vm)?;
self.push_value(result);
Ok(None)
}
bytecode::Instruction::CallIntrinsic2 { func } => {
let value2 = self.pop_value();
let value1 = self.pop_value();
let result = self.call_intrinsic_2(func.get(arg), value1, value2, vm)?;
self.push_value(result);
Ok(None)
}
bytecode::Instruction::CallMethodEx { has_kwargs } => {
let args = self.collect_ex_args(vm, has_kwargs.get(arg))?;
self.execute_method_call(args, vm)
}
bytecode::Instruction::CallMethodKeyword { nargs } => {
let args = self.collect_keyword_args(nargs.get(arg));
self.execute_method_call(args, vm)
}
bytecode::Instruction::CallMethodPositional { nargs } => {
let args = self.collect_positional_args(nargs.get(arg));
self.execute_method_call(args, vm)
}
bytecode::Instruction::CompareOperation { op } => self.execute_compare(vm, op.get(arg)),
bytecode::Instruction::ContainsOp(invert) => {
let b = self.pop_value();
let a = self.pop_value();
let value = match invert.get(arg) {
bytecode::Invert::No => self._in(vm, &a, &b)?,
bytecode::Invert::Yes => self._not_in(vm, &a, &b)?,
};
self.push_value(vm.ctx.new_bool(value).into());
Ok(None)
}
bytecode::Instruction::Continue { target } => self.unwind_blocks(
vm,
UnwindReason::Continue {
target: target.get(arg),
},
),
bytecode::Instruction::CopyItem { index } => {
// CopyItem { index: 1 } copies TOS
// CopyItem { index: 2 } copies second from top
// This is 1-indexed to match CPython
let idx = index.get(arg) as usize;
let value = self
.state
.stack
.len()
.checked_sub(idx)
.map(|i| &self.state.stack[i])
.unwrap();
self.push_value(value.clone());
Ok(None)
}
bytecode::Instruction::DeleteAttr { idx } => self.delete_attr(vm, idx.get(arg)),
bytecode::Instruction::DeleteDeref(i) => {
self.cells_frees[i.get(arg) as usize].set(None);
Ok(None)
}
bytecode::Instruction::DeleteFast(idx) => {
let mut fastlocals = self.fastlocals.lock();
let idx = idx.get(arg) as usize;
if fastlocals[idx].is_none() {
return Err(vm.new_exception_msg(
vm.ctx.exceptions.unbound_local_error.to_owned(),
format!(
"local variable '{}' referenced before assignment",
self.code.varnames[idx]
),
));
}
fastlocals[idx] = None;
Ok(None)
}
bytecode::Instruction::DeleteGlobal(idx) => {
let name = self.code.names[idx.get(arg) as usize];
match self.globals.del_item(name, vm) {
Ok(()) => {}
Err(e) if e.fast_isinstance(vm.ctx.exceptions.key_error) => {
return Err(name_error(name, vm));
}
Err(e) => return Err(e),
}
Ok(None)
}
bytecode::Instruction::DeleteLocal(idx) => {
let name = self.code.names[idx.get(arg) as usize];
let res = self.locals.mapping().ass_subscript(name, None, vm);
match res {
Ok(()) => {}
Err(e) if e.fast_isinstance(vm.ctx.exceptions.key_error) => {
return Err(name_error(name, vm));
}
Err(e) => return Err(e),
}
Ok(None)
}
bytecode::Instruction::DeleteSubscript => self.execute_delete_subscript(vm),
bytecode::Instruction::DictUpdate { index } => {
// Stack before: [..., dict, ..., source] (source at TOS)
// Stack after: [..., dict, ...] (source consumed)
// The dict to update is at position TOS-i (before popping source)
let idx = index.get(arg);
// Pop the source from TOS
let source = self.pop_value();
// Get the dict to update (it's now at TOS-(i-1) after popping source)
let dict = if idx <= 1 {
// DICT_UPDATE 0 or 1: dict is at TOS (after popping source)
self.top_value()
} else {
// DICT_UPDATE n: dict is at TOS-(n-1)
self.nth_value(idx - 1)
};
let dict = dict.downcast_ref::<PyDict>().expect("exact dict expected");
// For dictionary unpacking {**x}, x must be a mapping
// Check if the object has the mapping protocol (keys method)
if vm
.get_method(source.clone(), vm.ctx.intern_str("keys"))
.is_none()
{
return Err(vm.new_type_error(format!(
"'{}' object is not a mapping",
source.class().name()
)));
}
dict.merge_object(source, vm)?;
Ok(None)
}
bytecode::Instruction::EndAsyncFor => {
let exc = self.pop_value();
let except_block = self.pop_block(); // pushed by TryExcept unwind
debug_assert_eq!(except_block.level, self.state.stack.len());
let _async_iterator = self.pop_value(); // __anext__ provider in the loop
if exc.fast_isinstance(vm.ctx.exceptions.stop_async_iteration) {
vm.take_exception().expect("Should have exception in stack");
Ok(None)
} else {
Err(exc.downcast().unwrap())
}
}
bytecode::Instruction::EndFinally => {
// Pop the finally handler from the stack, and recall
// what was the reason we were in this finally clause.
let block = self.pop_block();
if let BlockType::FinallyHandler { reason, prev_exc } = block.typ {
vm.set_exception(prev_exc);
if let Some(reason) = reason {
self.unwind_blocks(vm, reason)
} else {
Ok(None)
}
} else {
self.fatal(
"Block type must be finally handler when reaching EndFinally instruction!",
);
}
}
bytecode::Instruction::EnterFinally => {
self.push_block(BlockType::FinallyHandler {
reason: None,
prev_exc: vm.current_exception(),
});
Ok(None)
}
bytecode::Instruction::ExtendedArg => {
*extend_arg = true;
Ok(None)
}
bytecode::Instruction::ForIter { target } => self.execute_for_iter(vm, target.get(arg)),
bytecode::Instruction::FormatValue { conversion } => {
self.format_value(conversion.get(arg), vm)
}
bytecode::Instruction::GetAIter => {
let aiterable = self.pop_value();
let aiter = vm.call_special_method(&aiterable, identifier!(vm, __aiter__), ())?;
self.push_value(aiter);
Ok(None)
}
bytecode::Instruction::GetANext => {
#[cfg(debug_assertions)] // remove when GetANext is fully implemented
let orig_stack_len = self.state.stack.len();
let aiter = self.top_value();
let awaitable = if aiter.class().is(vm.ctx.types.async_generator) {
vm.call_special_method(aiter, identifier!(vm, __anext__), ())?
} else {
if !aiter.has_attr("__anext__", vm).unwrap_or(false) {
// TODO: __anext__ must be protocol
let msg = format!(
"'async for' requires an iterator with __anext__ method, got {:.100}",
aiter.class().name()
);
return Err(vm.new_type_error(msg));
}
let next_iter =
vm.call_special_method(aiter, identifier!(vm, __anext__), ())?;
// _PyCoro_GetAwaitableIter in CPython
fn get_awaitable_iter(next_iter: &PyObject, vm: &VirtualMachine) -> PyResult {
let gen_is_coroutine = |_| {
// TODO: cpython gen_is_coroutine
true
};
if next_iter.class().is(vm.ctx.types.coroutine_type)
|| gen_is_coroutine(next_iter)
{
return Ok(next_iter.to_owned());
}
// TODO: error handling
vm.call_special_method(next_iter, identifier!(vm, __await__), ())
}
get_awaitable_iter(&next_iter, vm).map_err(|_| {
vm.new_type_error(format!(
"'async for' received an invalid object from __anext__: {:.200}",
next_iter.class().name()
))
})?
};
self.push_value(awaitable);
#[cfg(debug_assertions)]
debug_assert_eq!(orig_stack_len + 1, self.state.stack.len());
Ok(None)
}
bytecode::Instruction::GetAwaitable => {
let awaited_obj = self.pop_value();
let awaitable = if awaited_obj.downcastable::<PyCoroutine>() {
awaited_obj
} else {
let await_method = vm.get_method_or_type_error(
awaited_obj.clone(),
identifier!(vm, __await__),
|| {
format!(
"object {} can't be used in 'await' expression",
awaited_obj.class().name(),
)
},
)?;
await_method.call((), vm)?
};
self.push_value(awaitable);
Ok(None)
}
bytecode::Instruction::GetIter => {
let iterated_obj = self.pop_value();
let iter_obj = iterated_obj.get_iter(vm)?;
self.push_value(iter_obj.into());
Ok(None)
}
bytecode::Instruction::GetLen => {
// STACK.append(len(STACK[-1]))
let obj = self.top_value();
let len = obj.length(vm)?;
self.push_value(vm.ctx.new_int(len).into());
Ok(None)
}
bytecode::Instruction::ImportFrom { idx } => {
let obj = self.import_from(vm, idx.get(arg))?;
self.push_value(obj);
Ok(None)
}
bytecode::Instruction::ImportName { idx } => {
self.import(vm, Some(self.code.names[idx.get(arg) as usize]))?;
Ok(None)
}
bytecode::Instruction::IsOp(invert) => {
let b = self.pop_value();
let a = self.pop_value();
let res = a.is(&b);
let value = match invert.get(arg) {
bytecode::Invert::No => res,
bytecode::Invert::Yes => !res,
};
self.push_value(vm.ctx.new_bool(value).into());
Ok(None)
}
bytecode::Instruction::JumpIfFalseOrPop { target } => {
self.jump_if_or_pop(vm, target.get(arg), false)
}
bytecode::Instruction::JumpIfNotExcMatch(target) => {
let b = self.pop_value();
let a = self.pop_value();
if let Some(tuple_of_exceptions) = b.downcast_ref::<PyTuple>() {
for exception in tuple_of_exceptions {
if !exception
.is_subclass(vm.ctx.exceptions.base_exception_type.into(), vm)?
{
return Err(vm.new_type_error(
"catching classes that do not inherit from BaseException is not allowed",
));
}
}
} else if !b.is_subclass(vm.ctx.exceptions.base_exception_type.into(), vm)? {
return Err(vm.new_type_error(
"catching classes that do not inherit from BaseException is not allowed",
));
}
let value = a.is_instance(&b, vm)?;
self.push_value(vm.ctx.new_bool(value).into());
self.pop_jump_if(vm, target.get(arg), false)
}
bytecode::Instruction::JumpIfTrueOrPop { target } => {
self.jump_if_or_pop(vm, target.get(arg), true)
}
bytecode::Instruction::Jump { target } => {
self.jump(target.get(arg));
Ok(None)
}
bytecode::Instruction::ListAppend { i } => {
let item = self.pop_value();
let obj = self.nth_value(i.get(arg));
let list: &Py<PyList> = unsafe {
// SAFETY: trust compiler
obj.downcast_unchecked_ref()
};
list.append(item);
Ok(None)
}