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Copy pathoparg.rs
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877 lines (784 loc) · 21.7 KB
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use core::fmt;
use crate::{
bytecode::{CodeUnit, instruction::Instruction},
marshal::MarshalError,
};
pub trait OpArgType: Copy + Into<u32> + TryFrom<u32> {}
/// Opcode argument that may be extended by a prior ExtendedArg.
#[derive(Copy, Clone, PartialEq, Eq)]
#[repr(transparent)]
pub struct OpArgByte(u8);
impl OpArgByte {
pub const NULL: Self = Self::new(0);
#[must_use]
pub const fn new(value: u8) -> Self {
Self(value)
}
}
impl From<u8> for OpArgByte {
fn from(raw: u8) -> Self {
Self::new(raw)
}
}
impl From<OpArgByte> for u8 {
fn from(value: OpArgByte) -> Self {
value.0
}
}
impl fmt::Debug for OpArgByte {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(f)
}
}
/// Full 32-bit op_arg, including any possible ExtendedArg extension.
#[derive(Copy, Clone, Debug)]
#[repr(transparent)]
pub struct OpArg(u32);
impl OpArg {
pub const NULL: Self = Self::new(0);
#[must_use]
pub const fn new(value: u32) -> Self {
Self(value)
}
/// Returns how many CodeUnits a instruction with this op_arg will be encoded as
#[inline]
pub const fn instr_size(self) -> usize {
(self.0 > 0xff) as usize + (self.0 > 0xff_ff) as usize + (self.0 > 0xff_ff_ff) as usize + 1
}
/// returns the arg split into any necessary ExtendedArg components (in big-endian order) and
/// the arg for the real opcode itself
#[inline(always)]
pub fn split(self) -> (impl ExactSizeIterator<Item = OpArgByte>, OpArgByte) {
let mut it = self
.0
.to_le_bytes()
.map(OpArgByte)
.into_iter()
.take(self.instr_size());
let lo = it.next().unwrap();
(it.rev(), lo)
}
}
impl From<u32> for OpArg {
fn from(raw: u32) -> Self {
Self::new(raw)
}
}
impl From<OpArg> for u32 {
fn from(value: OpArg) -> Self {
value.0
}
}
#[derive(Default, Copy, Clone)]
#[repr(transparent)]
pub struct OpArgState {
state: u32,
}
impl OpArgState {
#[inline(always)]
pub fn get(&mut self, ins: CodeUnit) -> (Instruction, OpArg) {
let arg = self.extend(ins.arg);
if !matches!(ins.op, Instruction::ExtendedArg) {
self.reset();
}
(ins.op, arg)
}
#[inline(always)]
pub fn extend(&mut self, arg: OpArgByte) -> OpArg {
self.state = (self.state << 8) | u32::from(arg.0);
self.state.into()
}
#[inline(always)]
pub const fn reset(&mut self) {
self.state = 0
}
}
/// Helper macro for defining oparg enums in an optimal way.
///
/// Will generate the following:
///
/// - Enum which variant's aren't assigned any value (for optimizations).
/// - impl [`TryFrom<u8>`]
/// - impl [`TryFrom<u32>`]
/// - impl [`Into<u8>`]
/// - impl [`Into<u32>`]
/// - impl [`OpArgType`]
///
/// # Note
/// If an enum variant has "alternative" values (i.e. `Foo = 0 | 1`), the first value will be the
/// result of converting to a number.
///
/// # Examples
///
/// ```ignore
/// oparg_enum!(
/// /// Oparg for the `X` opcode.
/// #[derive(Clone, Copy)]
/// pub enum MyOpArg {
/// /// Some doc.
/// Foo = 4,
/// Bar = 8,
/// Baz = 15 | 16,
/// Qux = 23 | 42
/// }
/// );
/// ```
macro_rules! oparg_enum {
(
$(#[$enum_meta:meta])*
$vis:vis enum $name:ident {
$(
$(#[$variant_meta:meta])*
$variant:ident = $value:literal $(| $alternatives:expr)*
),* $(,)?
}
) => {
$(#[$enum_meta])*
$vis enum $name {
$(
$(#[$variant_meta])*
$variant, // Do assign value to variant.
)*
}
impl_oparg_enum!(
enum $name {
$(
$variant = $value $(| $alternatives)*,
)*
}
);
};
}
macro_rules! impl_oparg_enum {
(
enum $name:ident {
$(
$variant:ident = $value:literal $(| $alternatives:expr)*
),* $(,)?
}
) => {
impl TryFrom<u8> for $name {
type Error = $crate::marshal::MarshalError;
fn try_from(value: u8) -> Result<Self, Self::Error> {
Ok(match value {
$(
$value $(| $alternatives)* => Self::$variant,
)*
_ => return Err(Self::Error::InvalidBytecode),
})
}
}
impl TryFrom<u32> for $name {
type Error = $crate::marshal::MarshalError;
fn try_from(value: u32) -> Result<Self, Self::Error> {
u8::try_from(value)
.map_err(|_| Self::Error::InvalidBytecode)
.map(TryInto::try_into)?
}
}
impl From<$name> for u8 {
fn from(value: $name) -> Self {
match value {
$(
$name::$variant => $value,
)*
}
}
}
impl From<$name> for u32 {
fn from(value: $name) -> Self {
Self::from(u8::from(value))
}
}
impl OpArgType for $name {}
};
}
oparg_enum!(
/// Oparg values for [`Instruction::ConvertValue`].
///
/// ## See also
///
/// - [CPython FVC_* flags](https://github.com/python/cpython/blob/8183fa5e3f78ca6ab862de7fb8b14f3d929421e0/Include/ceval.h#L129-L132)
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub enum ConvertValueOparg {
/// No conversion.
///
/// ```python
/// f"{x}"
/// f"{x:4}"
/// ```
// Ruff `ConversionFlag::None` is `-1i8`, when its converted to `u8` its value is `u8::MAX`.
None = 0 | 255,
/// Converts by calling `str(<value>)`.
///
/// ```python
/// f"{x!s}"
/// f"{x!s:2}"
/// ```
Str = 1,
/// Converts by calling `repr(<value>)`.
///
/// ```python
/// f"{x!r}"
/// f"{x!r:2}"
/// ```
Repr = 2,
/// Converts by calling `ascii(<value>)`.
///
/// ```python
/// f"{x!a}"
/// f"{x!a:2}"
/// ```
Ascii = 3,
}
);
impl fmt::Display for ConvertValueOparg {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let out = match self {
Self::Str => "1 (str)",
Self::Repr => "2 (repr)",
Self::Ascii => "3 (ascii)",
// We should never reach this. `FVC_NONE` are being handled by `Instruction::FormatSimple`
Self::None => "",
};
write!(f, "{out}")
}
}
oparg_enum!(
/// Resume type for the RESUME instruction
#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq)]
pub enum ResumeType {
AtFuncStart = 0,
AfterYield = 1,
AfterYieldFrom = 2,
AfterAwait = 3,
}
);
pub type NameIdx = u32;
impl OpArgType for u32 {}
oparg_enum!(
/// The kind of Raise that occurred.
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum RaiseKind {
/// Bare `raise` statement with no arguments.
/// Gets the current exception from VM state (topmost_exception).
/// Maps to RAISE_VARARGS with oparg=0.
BareRaise = 0,
/// `raise exc` - exception is on the stack.
/// Maps to RAISE_VARARGS with oparg=1.
Raise = 1,
/// `raise exc from cause` - exception and cause are on the stack.
/// Maps to RAISE_VARARGS with oparg=2.
RaiseCause = 2,
/// Reraise exception from the stack top.
/// Used in exception handler cleanup blocks (finally, except).
/// Gets exception from stack, not from VM state.
/// Maps to the RERAISE opcode.
ReraiseFromStack = 3,
}
);
oparg_enum!(
/// Intrinsic function for CALL_INTRINSIC_1
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum IntrinsicFunction1 {
// Invalid = 0,
Print = 1,
/// Import * operation
ImportStar = 2,
/// Convert StopIteration to RuntimeError in async context
StopIterationError = 3,
AsyncGenWrap = 4,
UnaryPositive = 5,
/// Convert list to tuple
ListToTuple = 6,
/// Type parameter related
TypeVar = 7,
ParamSpec = 8,
TypeVarTuple = 9,
/// Generic subscript for PEP 695
SubscriptGeneric = 10,
TypeAlias = 11,
}
);
oparg_enum!(
/// Intrinsic function for CALL_INTRINSIC_2
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum IntrinsicFunction2 {
PrepReraiseStar = 1,
TypeVarWithBound = 2,
TypeVarWithConstraint = 3,
SetFunctionTypeParams = 4,
/// Set default value for type parameter (PEP 695)
SetTypeparamDefault = 5,
}
);
bitflagset::bitflag! {
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
#[repr(u8)]
pub enum MakeFunctionFlag {
Closure = 0,
Annotations = 1,
KwOnlyDefaults = 2,
Defaults = 3,
TypeParams = 4,
/// PEP 649: __annotate__ function closure (instead of __annotations__ dict)
Annotate = 5,
}
}
bitflagset::bitflagset! {
#[derive(Copy, Clone, PartialEq, Eq)]
pub struct MakeFunctionFlags(u8): MakeFunctionFlag
}
impl TryFrom<u32> for MakeFunctionFlag {
type Error = MarshalError;
fn try_from(value: u32) -> Result<Self, Self::Error> {
Self::try_from(value as u8).map_err(|_| MarshalError::InvalidBytecode)
}
}
impl From<MakeFunctionFlag> for u32 {
fn from(flag: MakeFunctionFlag) -> Self {
flag as u32
}
}
impl OpArgType for MakeFunctionFlag {}
oparg_enum!(
/// The possible comparison operators.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum ComparisonOperator {
// be intentional with bits so that we can do eval_ord with just a bitwise and
// bits: | Equal | Greater | Less |
Less = 0b001,
Greater = 0b010,
NotEqual = 0b011,
Equal = 0b100,
LessOrEqual = 0b101,
GreaterOrEqual = 0b110,
}
);
oparg_enum!(
/// The possible Binary operators
///
/// # Examples
///
/// ```rust
/// use rustpython_compiler_core::bytecode::{Arg, BinaryOperator, Instruction};
/// let (op, _) = Arg::new(BinaryOperator::Add);
/// let instruction = Instruction::BinaryOp { op };
/// ```
///
/// See also:
/// - [_PyEval_BinaryOps](https://github.com/python/cpython/blob/8183fa5e3f78ca6ab862de7fb8b14f3d929421e0/Python/ceval.c#L316-L343)
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum BinaryOperator {
/// `+`
Add = 0,
/// `&`
And = 1,
/// `//`
FloorDivide = 2,
/// `<<`
Lshift = 3,
/// `@`
MatrixMultiply = 4,
/// `*`
Multiply = 5,
/// `%`
Remainder = 6,
/// `|`
Or = 7,
/// `**`
Power = 8,
/// `>>`
Rshift = 9,
/// `-`
Subtract = 10,
/// `/`
TrueDivide = 11,
/// `^`
Xor = 12,
/// `+=`
InplaceAdd = 13,
/// `&=`
InplaceAnd = 14,
/// `//=`
InplaceFloorDivide = 15,
/// `<<=`
InplaceLshift = 16,
/// `@=`
InplaceMatrixMultiply = 17,
/// `*=`
InplaceMultiply = 18,
/// `%=`
InplaceRemainder = 19,
/// `|=`
InplaceOr = 20,
/// `**=`
InplacePower = 21,
/// `>>=`
InplaceRshift = 22,
/// `-=`
InplaceSubtract = 23,
/// `/=`
InplaceTrueDivide = 24,
/// `^=`
InplaceXor = 25,
/// `[]` subscript
Subscr = 26,
}
);
impl BinaryOperator {
/// Get the "inplace" version of the operator.
/// This has no effect if `self` is already an "inplace" operator.
///
/// # Example
/// ```rust
/// use rustpython_compiler_core::bytecode::BinaryOperator;
///
/// assert_eq!(BinaryOperator::Power.as_inplace(), BinaryOperator::InplacePower);
///
/// assert_eq!(BinaryOperator::InplaceSubtract.as_inplace(), BinaryOperator::InplaceSubtract);
/// ```
#[must_use]
pub const fn as_inplace(self) -> Self {
match self {
Self::Add => Self::InplaceAdd,
Self::And => Self::InplaceAnd,
Self::FloorDivide => Self::InplaceFloorDivide,
Self::Lshift => Self::InplaceLshift,
Self::MatrixMultiply => Self::InplaceMatrixMultiply,
Self::Multiply => Self::InplaceMultiply,
Self::Remainder => Self::InplaceRemainder,
Self::Or => Self::InplaceOr,
Self::Power => Self::InplacePower,
Self::Rshift => Self::InplaceRshift,
Self::Subtract => Self::InplaceSubtract,
Self::TrueDivide => Self::InplaceTrueDivide,
Self::Xor => Self::InplaceXor,
_ => self,
}
}
}
impl fmt::Display for BinaryOperator {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let op = match self {
Self::Add => "+",
Self::And => "&",
Self::FloorDivide => "//",
Self::Lshift => "<<",
Self::MatrixMultiply => "@",
Self::Multiply => "*",
Self::Remainder => "%",
Self::Or => "|",
Self::Power => "**",
Self::Rshift => ">>",
Self::Subtract => "-",
Self::TrueDivide => "/",
Self::Xor => "^",
Self::InplaceAdd => "+=",
Self::InplaceAnd => "&=",
Self::InplaceFloorDivide => "//=",
Self::InplaceLshift => "<<=",
Self::InplaceMatrixMultiply => "@=",
Self::InplaceMultiply => "*=",
Self::InplaceRemainder => "%=",
Self::InplaceOr => "|=",
Self::InplacePower => "**=",
Self::InplaceRshift => ">>=",
Self::InplaceSubtract => "-=",
Self::InplaceTrueDivide => "/=",
Self::InplaceXor => "^=",
Self::Subscr => "[]",
};
write!(f, "{op}")
}
}
oparg_enum!(
/// Whether or not to invert the operation.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum Invert {
/// ```py
/// foo is bar
/// x in lst
/// ```
No = 0,
/// ```py
/// foo is not bar
/// x not in lst
/// ```
Yes = 1,
}
);
oparg_enum!(
/// Special method for LOAD_SPECIAL opcode (context managers).
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum SpecialMethod {
/// `__enter__` for sync context manager
Enter = 0,
/// `__exit__` for sync context manager
Exit = 1,
/// `__aenter__` for async context manager
AEnter = 2,
/// `__aexit__` for async context manager
AExit = 3,
}
);
impl fmt::Display for SpecialMethod {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let method_name = match self {
Self::Enter => "__enter__",
Self::Exit => "__exit__",
Self::AEnter => "__aenter__",
Self::AExit => "__aexit__",
};
write!(f, "{method_name}")
}
}
oparg_enum!(
/// Common constants for LOAD_COMMON_CONSTANT opcode.
/// pycore_opcode_utils.h CONSTANT_*
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum CommonConstant {
/// `AssertionError` exception type
AssertionError = 0,
/// `NotImplementedError` exception type
NotImplementedError = 1,
/// Built-in `tuple` type
BuiltinTuple = 2,
/// Built-in `all` function
BuiltinAll = 3,
/// Built-in `any` function
BuiltinAny = 4,
}
);
impl fmt::Display for CommonConstant {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let name = match self {
Self::AssertionError => "AssertionError",
Self::NotImplementedError => "NotImplementedError",
Self::BuiltinTuple => "tuple",
Self::BuiltinAll => "all",
Self::BuiltinAny => "any",
};
write!(f, "{name}")
}
}
oparg_enum!(
/// Specifies if a slice is built with either 2 or 3 arguments.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum BuildSliceArgCount {
/// ```py
/// x[5:10]
/// ```
Two = 2,
/// ```py
/// x[5:10:2]
/// ```
Three = 3,
}
);
#[derive(Copy, Clone)]
pub struct UnpackExArgs {
pub before: u8,
pub after: u8,
}
impl From<u32> for UnpackExArgs {
fn from(value: u32) -> Self {
let [before, after, ..] = value.to_le_bytes();
Self { before, after }
}
}
impl From<UnpackExArgs> for u32 {
fn from(value: UnpackExArgs) -> Self {
Self::from_le_bytes([value.before, value.after, 0, 0])
}
}
impl OpArgType for UnpackExArgs {}
impl fmt::Display for UnpackExArgs {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "before: {}, after: {}", self.before, self.after)
}
}
macro_rules! newtype_oparg {
(
$(#[$oparg_meta:meta])*
$vis:vis struct $name:ident(u32)
) => {
$(#[$oparg_meta])*
$vis struct $name(u32);
impl $name {
/// Creates a new [`$name`] instance.
#[must_use]
pub const fn new(value: u32) -> Self {
Self(value)
}
/// Alias to [`$name::new`].
#[must_use]
pub const fn from_u32(value: u32) -> Self {
Self::new(value)
}
/// Returns the oparg as a `u32` value.
#[must_use]
pub const fn as_u32(self) -> u32 {
self.0
}
/// Returns the oparg as a `usize` value.
#[must_use]
pub const fn as_usize(self) -> usize {
self.0 as usize
}
}
impl From<u32> for $name {
fn from(value: u32) -> Self {
Self::from_u32(value)
}
}
impl From<$name> for u32 {
fn from(value: $name) -> Self {
value.as_u32()
}
}
impl From<$name> for usize {
fn from(value: $name) -> Self {
value.as_usize()
}
}
impl ::core::fmt::Display for $name {
fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
self.0.fmt(f)
}
}
impl OpArgType for $name {}
}
}
newtype_oparg!(
#[derive(Clone, Copy)]
#[repr(transparent)]
pub struct ConstIdx(u32)
);
newtype_oparg!(
#[derive(Clone, Copy)]
#[repr(transparent)]
pub struct VarNum(u32)
);
newtype_oparg!(
#[derive(Clone, Copy)]
#[repr(transparent)]
pub struct VarNums(u32)
);
newtype_oparg!(
#[derive(Clone, Copy)]
#[repr(transparent)]
pub struct LoadAttr(u32)
);
newtype_oparg!(
#[derive(Clone, Copy)]
#[repr(transparent)]
pub struct LoadSuperAttr(u32)
);
newtype_oparg!(
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Ord, PartialOrd)]
#[repr(transparent)]
pub struct Label(u32)
);
impl VarNums {
#[must_use]
pub const fn idx_1(self) -> VarNum {
VarNum::new(self.0 >> 4)
}
#[must_use]
pub const fn idx_2(self) -> VarNum {
VarNum::new(self.0 & 15)
}
#[must_use]
pub const fn indexes(self) -> (VarNum, VarNum) {
(self.idx_1(), self.idx_2())
}
}
impl LoadAttr {
#[must_use]
pub fn builder() -> LoadAttrBuilder {
LoadAttrBuilder::default()
}
#[must_use]
pub const fn name_idx(self) -> u32 {
self.0 >> 1
}
#[must_use]
pub const fn is_method(self) -> bool {
(self.0 & 1) == 1
}
}
#[derive(Clone, Copy, Default)]
pub struct LoadAttrBuilder {
name_idx: u32,
is_method: bool,
}
impl LoadAttrBuilder {
#[must_use]
pub const fn build(self) -> LoadAttr {
let value = (self.name_idx << 1) | (self.is_method as u32);
LoadAttr::new(value)
}
#[must_use]
pub const fn name_idx(mut self, value: u32) -> Self {
self.name_idx = value;
self
}
#[must_use]
pub const fn is_method(mut self, value: bool) -> Self {
self.is_method = value;
self
}
}
impl LoadSuperAttr {
#[must_use]
pub fn builder() -> LoadSuperAttrBuilder {
LoadSuperAttrBuilder::default()
}
#[must_use]
pub const fn name_idx(self) -> u32 {
self.0 >> 2
}
#[must_use]
pub const fn is_load_method(self) -> bool {
(self.0 & 1) == 1
}
#[must_use]
pub const fn has_class(self) -> bool {
(self.0 & 2) == 2
}
}
#[derive(Clone, Copy, Default)]
pub struct LoadSuperAttrBuilder {
name_idx: u32,
is_load_method: bool,
has_class: bool,
}
impl LoadSuperAttrBuilder {
#[must_use]
pub const fn build(self) -> LoadSuperAttr {
let value =
(self.name_idx << 2) | ((self.has_class as u32) << 1) | (self.is_load_method as u32);
LoadSuperAttr::new(value)
}
#[must_use]
pub const fn name_idx(mut self, value: u32) -> Self {
self.name_idx = value;
self
}
#[must_use]
pub const fn is_load_method(mut self, value: bool) -> Self {
self.is_load_method = value;
self
}
#[must_use]
pub const fn has_class(mut self, value: bool) -> Self {
self.has_class = value;
self
}
}
impl From<LoadSuperAttrBuilder> for LoadSuperAttr {
fn from(builder: LoadSuperAttrBuilder) -> Self {
builder.build()
}
}