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//! Implement python as a virtual machine with bytecodes. This module
//! implements bytecode structure.
#![doc(html_logo_url = "https://raw.githubusercontent.com/RustPython/RustPython/master/logo.png")]
#![doc(html_root_url = "https://docs.rs/rustpython-bytecode/")]
#![cfg_attr(not(feature = "std"), no_std)]
extern crate alloc;
use alloc::collections::BTreeSet;
use alloc::{borrow::ToOwned, boxed::Box, string::String, vec::Vec};
use bitflags::bitflags;
use bstr::ByteSlice;
use core::fmt;
use itertools::Itertools;
use num_bigint::BigInt;
use num_complex::Complex64;
use serde::{Deserialize, Serialize};
/// Sourcecode location.
#[derive(Clone, Copy, Debug, Default, PartialEq, Serialize, Deserialize)]
pub struct Location {
row: usize,
column: usize,
}
impl Location {
pub fn new(row: usize, column: usize) -> Self {
Location { row, column }
}
pub fn row(&self) -> usize {
self.row
}
pub fn column(&self) -> usize {
self.column
}
}
pub trait Constant: Sized {
type Name: AsRef<str>;
fn borrow_constant(&self) -> BorrowedConstant<Self>;
fn into_data(self) -> ConstantData {
self.borrow_constant().into_data()
}
fn map_constant<Bag: ConstantBag>(self, bag: &Bag) -> Bag::Constant {
bag.make_constant(self.into_data())
}
fn map_name<Bag: ConstantBag>(
name: Self::Name,
bag: &Bag,
) -> <Bag::Constant as Constant>::Name {
bag.make_name_ref(name.as_ref())
}
}
impl Constant for ConstantData {
type Name = String;
fn borrow_constant(&self) -> BorrowedConstant<Self> {
use BorrowedConstant::*;
match self {
ConstantData::Integer { value } => Integer { value },
ConstantData::Float { value } => Float { value: *value },
ConstantData::Complex { value } => Complex { value: *value },
ConstantData::Boolean { value } => Boolean { value: *value },
ConstantData::Str { value } => Str { value },
ConstantData::Bytes { value } => Bytes { value },
ConstantData::Code { code } => Code { code },
ConstantData::Tuple { elements } => Tuple {
elements: Box::new(elements.iter().map(|e| e.borrow_constant())),
},
ConstantData::None => None,
ConstantData::Ellipsis => Ellipsis,
}
}
fn into_data(self) -> ConstantData {
self
}
fn map_name<Bag: ConstantBag>(name: String, bag: &Bag) -> <Bag::Constant as Constant>::Name {
bag.make_name(name)
}
}
pub trait ConstantBag: Sized {
type Constant: Constant;
fn make_constant(&self, constant: ConstantData) -> Self::Constant;
fn make_constant_borrowed<C: Constant>(&self, constant: BorrowedConstant<C>) -> Self::Constant {
self.make_constant(constant.into_data())
}
fn make_name(&self, name: String) -> <Self::Constant as Constant>::Name;
fn make_name_ref(&self, name: &str) -> <Self::Constant as Constant>::Name {
self.make_name(name.to_owned())
}
}
#[derive(Clone)]
pub struct BasicBag;
impl ConstantBag for BasicBag {
type Constant = ConstantData;
fn make_constant(&self, constant: ConstantData) -> Self::Constant {
constant
}
fn make_name(&self, name: String) -> <Self::Constant as Constant>::Name {
name
}
}
/// Primary container of a single code object. Each python function has
/// a codeobject. Also a module has a codeobject.
#[derive(Clone, PartialEq, Serialize, Deserialize)]
pub struct CodeObject<C: Constant = ConstantData> {
pub instructions: Box<[Instruction]>,
pub locations: Box<[Location]>,
pub flags: CodeFlags,
pub posonlyarg_count: usize, // Number of positional-only arguments
pub arg_count: usize,
pub kwonlyarg_count: usize,
pub source_path: C::Name,
pub first_line_number: usize,
pub max_stacksize: u32,
pub obj_name: C::Name, // Name of the object that created this code object
pub cell2arg: Option<Box<[isize]>>,
pub constants: Box<[C]>,
#[serde(bound(
deserialize = "C::Name: serde::Deserialize<'de>",
serialize = "C::Name: serde::Serialize"
))]
pub names: Box<[C::Name]>,
pub varnames: Box<[C::Name]>,
pub cellvars: Box<[C::Name]>,
pub freevars: Box<[C::Name]>,
}
bitflags! {
#[derive(Serialize, Deserialize)]
pub struct CodeFlags: u16 {
const NEW_LOCALS = 0x01;
const IS_GENERATOR = 0x02;
const IS_COROUTINE = 0x04;
const HAS_VARARGS = 0x08;
const HAS_VARKEYWORDS = 0x10;
const IS_OPTIMIZED = 0x20;
}
}
impl CodeFlags {
pub const NAME_MAPPING: &'static [(&'static str, CodeFlags)] = &[
("GENERATOR", CodeFlags::IS_GENERATOR),
("COROUTINE", CodeFlags::IS_COROUTINE),
(
"ASYNC_GENERATOR",
Self::from_bits_truncate(Self::IS_GENERATOR.bits | Self::IS_COROUTINE.bits),
),
("VARARGS", CodeFlags::HAS_VARARGS),
("VARKEYWORDS", CodeFlags::HAS_VARKEYWORDS),
];
}
#[derive(Serialize, Debug, Deserialize, Clone, Copy, PartialEq, Eq, Hash, Ord, PartialOrd)]
#[repr(transparent)]
// XXX: if you add a new instruction that stores a Label, make sure to add it in
// Instruction::label_arg{,_mut}
pub struct Label(pub u32);
impl fmt::Display for Label {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.fmt(f)
}
}
/// Transforms a value prior to formatting it.
#[derive(Copy, Clone, Debug, PartialEq, Serialize, Deserialize)]
pub enum ConversionFlag {
/// No conversion
None,
/// Converts by calling `str(<value>)`.
Str,
/// Converts by calling `ascii(<value>)`.
Ascii,
/// Converts by calling `repr(<value>)`.
Repr,
}
#[derive(Copy, Clone, Debug, PartialEq, Serialize, Deserialize)]
pub enum RaiseKind {
Reraise,
Raise,
RaiseCause,
}
pub type NameIdx = u32;
/// A Single bytecode instruction.
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum Instruction {
ImportName {
idx: NameIdx,
},
ImportNameless,
ImportStar,
ImportFrom {
idx: NameIdx,
},
LoadFast(NameIdx),
LoadNameAny(NameIdx),
LoadGlobal(NameIdx),
LoadDeref(NameIdx),
LoadClassDeref(NameIdx),
StoreFast(NameIdx),
StoreLocal(NameIdx),
StoreGlobal(NameIdx),
StoreDeref(NameIdx),
DeleteFast(NameIdx),
DeleteLocal(NameIdx),
DeleteGlobal(NameIdx),
DeleteDeref(NameIdx),
LoadClosure(NameIdx),
Subscript,
StoreSubscript,
DeleteSubscript,
StoreAttr {
idx: NameIdx,
},
DeleteAttr {
idx: NameIdx,
},
LoadConst {
/// index into constants vec
idx: u32,
},
UnaryOperation {
op: UnaryOperator,
},
BinaryOperation {
op: BinaryOperator,
},
BinaryOperationInplace {
op: BinaryOperator,
},
LoadAttr {
idx: NameIdx,
},
CompareOperation {
op: ComparisonOperator,
},
Pop,
Rotate {
amount: u32,
},
Duplicate,
GetIter,
Continue {
target: Label,
},
Break {
target: Label,
},
Jump {
target: Label,
},
/// Pop the top of the stack, and jump if this value is true.
JumpIfTrue {
target: Label,
},
/// Pop the top of the stack, and jump if this value is false.
JumpIfFalse {
target: Label,
},
/// Peek at the top of the stack, and jump if this value is true.
/// Otherwise, pop top of stack.
JumpIfTrueOrPop {
target: Label,
},
/// Peek at the top of the stack, and jump if this value is false.
/// Otherwise, pop top of stack.
JumpIfFalseOrPop {
target: Label,
},
MakeFunction(MakeFunctionFlags),
CallFunctionPositional {
nargs: u32,
},
CallFunctionKeyword {
nargs: u32,
},
CallFunctionEx {
has_kwargs: bool,
},
ForIter {
target: Label,
},
ReturnValue,
YieldValue,
YieldFrom,
SetupAnnotation,
SetupLoop,
/// Setup a finally handler, which will be called whenever one of this events occurs:
/// - the block is popped
/// - the function returns
/// - an exception is returned
SetupFinally {
handler: Label,
},
/// Enter a finally block, without returning, excepting, just because we are there.
EnterFinally,
/// Marker bytecode for the end of a finally sequence.
/// When this bytecode is executed, the eval loop does one of those things:
/// - Continue at a certain bytecode position
/// - Propagate the exception
/// - Return from a function
/// - Do nothing at all, just continue
EndFinally,
SetupExcept {
handler: Label,
},
SetupWith {
end: Label,
},
WithCleanupStart,
WithCleanupFinish,
PopBlock,
Raise {
kind: RaiseKind,
},
BuildString {
size: u32,
},
BuildTuple {
unpack: bool,
size: u32,
},
BuildList {
unpack: bool,
size: u32,
},
BuildSet {
unpack: bool,
size: u32,
},
BuildMap {
unpack: bool,
for_call: bool,
size: u32,
},
BuildSlice {
/// whether build a slice with a third step argument
step: bool,
},
ListAppend {
i: u32,
},
SetAdd {
i: u32,
},
MapAdd {
i: u32,
},
PrintExpr,
LoadBuildClass,
UnpackSequence {
size: u32,
},
UnpackEx {
before: u8,
after: u8,
},
FormatValue {
conversion: ConversionFlag,
},
PopException,
Reverse {
amount: u32,
},
GetAwaitable,
BeforeAsyncWith,
SetupAsyncWith {
end: Label,
},
GetAIter,
GetANext,
EndAsyncFor,
/// Reverse order evaluation in MapAdd
/// required to support named expressions of Python 3.8 in dict comprehension
/// today (including Py3.9) only required in dict comprehension.
MapAddRev {
i: u32,
},
}
use self::Instruction::*;
bitflags! {
#[derive(Serialize, Deserialize)]
pub struct MakeFunctionFlags: u8 {
const CLOSURE = 0x01;
const ANNOTATIONS = 0x02;
const KW_ONLY_DEFAULTS = 0x04;
const DEFAULTS = 0x08;
}
}
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum ConstantData {
Integer { value: BigInt },
Float { value: f64 },
Complex { value: Complex64 },
Boolean { value: bool },
Str { value: String },
Bytes { value: Vec<u8> },
Code { code: Box<CodeObject> },
Tuple { elements: Vec<ConstantData> },
None,
Ellipsis,
}
pub enum BorrowedConstant<'a, C: Constant> {
Integer { value: &'a BigInt },
Float { value: f64 },
Complex { value: Complex64 },
Boolean { value: bool },
Str { value: &'a str },
Bytes { value: &'a [u8] },
Code { code: &'a CodeObject<C> },
Tuple { elements: BorrowedTupleIter<'a, C> },
None,
Ellipsis,
}
type BorrowedTupleIter<'a, C> = Box<dyn Iterator<Item = BorrowedConstant<'a, C>> + 'a>;
impl<C: Constant> BorrowedConstant<'_, C> {
// takes `self` because we need to consume the iterator
pub fn fmt_display(self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
BorrowedConstant::Integer { value } => write!(f, "{}", value),
BorrowedConstant::Float { value } => write!(f, "{}", value),
BorrowedConstant::Complex { value } => write!(f, "{}", value),
BorrowedConstant::Boolean { value } => {
write!(f, "{}", if value { "True" } else { "False" })
}
BorrowedConstant::Str { value } => write!(f, "{:?}", value),
BorrowedConstant::Bytes { value } => write!(f, "b{:?}", value.as_bstr()),
BorrowedConstant::Code { code } => write!(f, "{:?}", code),
BorrowedConstant::Tuple { elements } => {
write!(f, "(")?;
let mut first = true;
for c in elements {
if first {
first = false
} else {
write!(f, ", ")?;
}
c.fmt_display(f)?;
}
write!(f, ")")
}
BorrowedConstant::None => write!(f, "None"),
BorrowedConstant::Ellipsis => write!(f, "..."),
}
}
pub fn into_data(self) -> ConstantData {
use ConstantData::*;
match self {
BorrowedConstant::Integer { value } => Integer {
value: value.clone(),
},
BorrowedConstant::Float { value } => Float { value },
BorrowedConstant::Complex { value } => Complex { value },
BorrowedConstant::Boolean { value } => Boolean { value },
BorrowedConstant::Str { value } => Str {
value: value.to_owned(),
},
BorrowedConstant::Bytes { value } => Bytes {
value: value.to_owned(),
},
BorrowedConstant::Code { code } => Code {
code: Box::new(code.map_clone_bag(&BasicBag)),
},
BorrowedConstant::Tuple { elements } => Tuple {
elements: elements.map(BorrowedConstant::into_data).collect(),
},
BorrowedConstant::None => None,
BorrowedConstant::Ellipsis => Ellipsis,
}
}
}
#[derive(Debug, Copy, Clone, PartialEq, Serialize, Deserialize)]
pub enum ComparisonOperator {
Greater,
GreaterOrEqual,
Less,
LessOrEqual,
Equal,
NotEqual,
In,
NotIn,
Is,
IsNot,
ExceptionMatch,
}
#[derive(Debug, Copy, Clone, PartialEq, Serialize, Deserialize)]
pub enum BinaryOperator {
Power,
Multiply,
MatrixMultiply,
Divide,
FloorDivide,
Modulo,
Add,
Subtract,
Lshift,
Rshift,
And,
Xor,
Or,
}
#[derive(Debug, Copy, Clone, PartialEq, Serialize, Deserialize)]
pub enum UnaryOperator {
Not,
Invert,
Minus,
Plus,
}
/*
Maintain a stack of blocks on the VM.
pub enum BlockType {
Loop,
Except,
}
*/
pub struct Arguments<'a, N: AsRef<str>> {
pub posonlyargs: &'a [N],
pub args: &'a [N],
pub vararg: Option<&'a N>,
pub kwonlyargs: &'a [N],
pub varkwarg: Option<&'a N>,
}
impl<N: AsRef<str>> fmt::Debug for Arguments<'_, N> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
macro_rules! fmt_slice {
($x:expr) => {
format_args!("[{}]", $x.iter().map(AsRef::as_ref).format(", "))
};
}
f.debug_struct("Arguments")
.field("posonlyargs", &fmt_slice!(self.posonlyargs))
.field("args", &fmt_slice!(self.posonlyargs))
.field("vararg", &self.vararg.map(N::as_ref))
.field("kwonlyargs", &fmt_slice!(self.kwonlyargs))
.field("varkwarg", &self.varkwarg.map(N::as_ref))
.finish()
}
}
impl<C: Constant> CodeObject<C> {
// like inspect.getargs
pub fn arg_names(&self) -> Arguments<C::Name> {
let nargs = self.arg_count;
let nkwargs = self.kwonlyarg_count;
let mut varargspos = nargs + nkwargs;
let posonlyargs = &self.varnames[..self.posonlyarg_count];
let args = &self.varnames[..nargs];
let kwonlyargs = &self.varnames[nargs..varargspos];
let vararg = if self.flags.contains(CodeFlags::HAS_VARARGS) {
let vararg = &self.varnames[varargspos];
varargspos += 1;
Some(vararg)
} else {
None
};
let varkwarg = if self.flags.contains(CodeFlags::HAS_VARKEYWORDS) {
Some(&self.varnames[varargspos])
} else {
None
};
Arguments {
posonlyargs,
args,
vararg,
kwonlyargs,
varkwarg,
}
}
pub fn label_targets(&self) -> BTreeSet<Label> {
let mut label_targets = BTreeSet::new();
for instruction in &*self.instructions {
if let Some(l) = instruction.label_arg() {
label_targets.insert(*l);
}
}
label_targets
}
fn display_inner(
&self,
f: &mut fmt::Formatter,
expand_codeobjects: bool,
level: usize,
) -> fmt::Result {
let label_targets = self.label_targets();
for (offset, instruction) in self.instructions.iter().enumerate() {
let arrow = if label_targets.contains(&Label(offset as u32)) {
">>"
} else {
" "
};
for _ in 0..level {
write!(f, " ")?;
}
write!(f, "{} {:5} ", arrow, offset)?;
instruction.fmt_dis(
f,
&self.constants,
&self.names,
&self.varnames,
&self.cellvars,
&self.freevars,
expand_codeobjects,
level,
)?;
}
Ok(())
}
pub fn display_expand_codeobjects(&self) -> impl fmt::Display + '_ {
struct Display<'a, C: Constant>(&'a CodeObject<C>);
impl<C: Constant> fmt::Display for Display<'_, C> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.display_inner(f, true, 1)
}
}
Display(self)
}
pub fn map_bag<Bag: ConstantBag>(self, bag: &Bag) -> CodeObject<Bag::Constant> {
let map_names = |names: Box<[C::Name]>| {
names
.into_vec()
.into_iter()
.map(|x| C::map_name(x, bag))
.collect::<Box<[_]>>()
};
CodeObject {
constants: self
.constants
.into_vec()
.into_iter()
.map(|x| x.map_constant(bag))
.collect(),
names: map_names(self.names),
varnames: map_names(self.varnames),
cellvars: map_names(self.cellvars),
freevars: map_names(self.freevars),
source_path: C::map_name(self.source_path, bag),
obj_name: C::map_name(self.obj_name, bag),
instructions: self.instructions,
locations: self.locations,
flags: self.flags,
<
809E
div id="LC673" class="react-file-line html-div" data-testid="code-cell" data-line-number="673" style="position:relative"> posonlyarg_count: self.posonlyarg_count,
arg_count: self.arg_count,
kwonlyarg_count: self.kwonlyarg_count,
first_line_number: self.first_line_number,
max_stacksize: self.max_stacksize,
cell2arg: self.cell2arg,
}
}
pub fn map_clone_bag<Bag: ConstantBag>(&self, bag: &Bag) -> CodeObject<Bag::Constant> {
let map_names = |names: &[C::Name]| {
names
.iter()
.map(|x| bag.make_name_ref(x.as_ref()))
.collect()
};
CodeObject {
constants: self
.constants
.iter()
.map(|x| bag.make_constant_borrowed(x.borrow_constant()))
.collect(),
names: map_names(&self.names),
varnames: map_names(&self.varnames),
cellvars: map_names(&self.cellvars),
freevars: map_names(&self.freevars),
source_path: bag.make_name_ref(self.source_path.as_ref()),
obj_name: bag.make_name_ref(self.obj_name.as_ref()),
instructions: self.instructions.clone(),
locations: self.locations.clone(),
flags: self.flags,
posonlyarg_count: self.posonlyarg_count,
arg_count: self.arg_count,
kwonlyarg_count: self.kwonlyarg_count,
first_line_number: self.first_line_number,
max_stacksize: self.max_stacksize,
cell2arg: self.cell2arg.clone(),
}
}
}
#[derive(Debug)]
#[non_exhaustive]
pub enum CodeDeserializeError {
Eof,
Other,
}
impl fmt::Display for CodeDeserializeError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Self::Eof => f.write_str("unexpected end of data"),
Self::Other => f.write_str("invalid bytecode"),
}
}
}
#[cfg(feature = "std")]
impl std::error::Error for CodeDeserializeError {}
impl CodeObject<ConstantData> {
/// Load a code object from bytes
pub fn from_bytes(data: &[u8]) -> Result<Self, CodeDeserializeError> {
use lz4_flex::block::DecompressError;
let raw_bincode = lz4_flex::decompress_size_prepended(data).map_err(|e| match e {
DecompressError::OutputTooSmall { .. } | DecompressError::ExpectedAnotherByte => {
CodeDeserializeError::Eof
}
_ => CodeDeserializeError::Other,
})?;
let data = bincode::deserialize(&raw_bincode).map_err(|e| match *e {
bincode::ErrorKind::Io(e) if e.kind() == std::io::ErrorKind::UnexpectedEof => {
CodeDeserializeError::Eof
}
_ => CodeDeserializeError::Other,
})?;
Ok(data)
}
/// Serialize this bytecode to bytes.
pub fn to_bytes(&self) -> Vec<u8> {
let data = bincode::serialize(&self).expect("CodeObject is not serializable");
lz4_flex::compress_prepend_size(&data)
}
}
impl<C: Constant> fmt::Display for CodeObject<C> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.display_inner(f, false, 1)?;
for constant in &*self.constants {
if let BorrowedConstant::Code { code } = constant.borrow_constant() {
write!(f, "\nDisassembly of {:?}\n", code)?;
code.fmt(f)?;
}
}
Ok(())
}
}
impl Instruction {
/// Gets the label stored inside this instruction, if it exists
#[inline]
pub fn label_arg(&self) -> Option<&Label> {
match self {
Jump { target: l }
| JumpIfTrue { target: l }
| JumpIfFalse { target: l }
| JumpIfTrueOrPop { target: l }
| JumpIfFalseOrPop { target: l }
| ForIter { target: l }
| SetupFinally { handler: l }
| SetupExcept { handler: l }
| SetupWith { end: l }
| SetupAsyncWith { end: l }
| Break { target: l }
| Continue { target: l } => Some(l),
_ => None,
}
}
/// Gets a mutable reference to the label stored inside this instruction, if it exists
#[inline]
pub fn label_arg_mut(&mut self) -> Option<&mut Label> {
match self {
Jump { target: l }
| JumpIfTrue { target: l }
| JumpIfFalse { target: l }
| JumpIfTrueOrPop { target: l }
| JumpIfFalseOrPop { target: l }
| ForIter { target: l }
| SetupFinally { handler: l }
| SetupExcept { handler: l }
| SetupWith { end: l }
| SetupAsyncWith { end: l }
| Break { target: l }
| Continue { target: l } => Some(l),
_ => None,
}
}
pub fn unconditional_branch(&self) -> bool {
matches!(self, Jump { .. } | Continue{ .. } | Break { .. } | ReturnValue | Raise { .. })
}
pub fn stack_effect(&self, jump: bool) -> i32 {
match self {
ImportName { .. } | ImportNameless => -1,
ImportStar => -1,
ImportFrom { .. } => 1,
LoadFast(_) | LoadNameAny(_) | LoadGlobal(_) | LoadDeref(_) | LoadClassDeref(_) => 1,
StoreFast(_) | StoreLocal(_) | StoreGlobal(_) | StoreDeref(_) => -1,
DeleteFast(_) | DeleteLocal(_) | DeleteGlobal(_) | DeleteDeref(_) => 0,
LoadClosure(_) => 1,
Subscript => -1,
StoreSubscript => -3,
DeleteSubscript => -2,
LoadAttr { .. } => 0,
StoreAttr { .. } => -2,
DeleteAttr { .. } => -1,
LoadConst { .. } => 1,
UnaryOperation { .. } => 0,
BinaryOperation { .. } | BinaryOperationInplace { .. } | CompareOperation { .. } => -1,
Pop => -1,
Rotate { .. } => 0,
Duplicate => 1,
GetIter => 0,
Continue { .. } => 0,
Break { .. } => 0,
Jump { .. } => 0,
JumpIfTrue { .. } | JumpIfFalse { .. } => -1,
JumpIfTrueOrPop { .. } | JumpIfFalseOrPop { .. } => {
if jump {
0
} else {
-1
}
}
MakeFunction(flags) => {
-2 - flags.contains(MakeFunctionFlags::CLOSURE) as i32
- flags.contains(MakeFunctionFlags::ANNOTATIONS) as i32
- flags.contains(MakeFunctionFlags::KW_ONLY_DEFAULTS) as i32
- flags.contains(MakeFunctionFlags::DEFAULTS) as i32
+ 1
}
CallFunctionPositional { nargs } => -1 - (*nargs as i32) + 1,
CallFunctionKeyword { nargs } => -2 - (*nargs as i32) + 1,
CallFunctionEx { has_kwargs } => -2 - *has_kwargs as i32 + 1,
ForIter { .. } => {
if jump {
-1
} else {
1
}
}
ReturnValue => -1,
YieldValue => 0,
YieldFrom => -1,
SetupAnnotation | SetupLoop | SetupFinally { .. } | EnterFinally | EndFinally => 0,
SetupExcept { .. } => {
if jump {
1
} else {
0
}
}
SetupWith { .. } => {
if jump {
0
} else {
1
}
}
WithCleanupStart => 0,
WithCleanupFinish => -1,
PopBlock => 0,
Raise { kind } => -(*kind as u8 as i32),
BuildString { size }
| BuildTuple { size, .. }
| BuildList { size, .. }
| BuildSet { size, .. } => -(*size as i32) + 1,
BuildMap { unpack, size, .. } => {
let nargs = if *unpack { *size } else { *size * 2 };
-(nargs as i32) + 1
}
BuildSlice { step } => -2 - (*step as i32) + 1,
ListAppend { .. } | SetAdd { .. } => -1,
MapAdd { .. } | MapAddRev { .. } => -2,
PrintExpr => -1,
LoadBuildClass => 1,
UnpackSequence { size } => -1 + *size as i32,
UnpackEx { before, after } => -1 + *before as i32 + 1 + *after as i32,
FormatValue { .. } => -1,
PopException => 0,
Reverse { .. } => 0,
GetAwaitable => 0,
BeforeAsyncWith => 1,
SetupAsyncWith { .. } => 0,
GetAIter => 0,
GetANext => 1,
EndAsyncFor => -1,
}
}
#[allow(clippy::too_many_arguments)]
fn fmt_dis<C: Constant>(
&self,
f: &mut fmt::Formatter,
constants: &[C],
names: &[C::Name],
varnames: &[C::Name],
cellvars: &[C::Name],
freevars: &[C::Name],
expand_codeobjects: bool,
level: usize,
) -> fmt::Result {
macro_rules! w {
($variant:ident) => {
writeln!(f, stringify!($variant))
};
($variant:ident, $var:expr) => {
writeln!(f, "{:20} ({})", stringify!($variant), $var)
};
($variant:ident, $var1:expr, $var2:expr) => {
writeln!(f, "{:20} ({}, {})", stringify!($variant), $var1, $var2)
};
($variant:ident, $var1:expr, $var2:expr, $var3:expr) => {
writeln!(
f,
"{:20} ({}, {}, {})",
stringify!($variant),
$var1,
$var2,
$var3
)
};
}
let varname = |i: u32| varnames[i as usize].as_ref();
let name = |i: u32| names[i as usize].as_ref();
let cellname = |i: u32| {
cellvars
.get(i as usize)
.unwrap_or_else(|| &freevars[i as usize - cellvars.len()])
.as_ref()
};
match self {
ImportName { idx } => w!(ImportName, name(*idx)),
ImportNameless => w!(ImportNameless),
ImportStar => w!(ImportStar),
ImportFrom { idx } => w!(ImportFrom, name(*idx)),
LoadFast(idx) => w!(LoadFast, *idx, varname(*idx)),
LoadNameAny(idx) => w!(LoadNameAny, *idx, name(*idx)),
LoadGlobal(idx) => w!(LoadGlobal, *idx, name(*idx)),
LoadDeref(idx) => w!(LoadDeref, *idx, cellname(*idx)),
LoadClassDeref(idx) => w!(LoadClassDeref, *idx, cellname(*idx)),
StoreFast(idx) => w!(StoreFast, *idx, varname(*idx)),
StoreLocal(idx) => w!(StoreLocal, *idx, name(*idx)),
StoreGlobal(idx) => w!(StoreGlobal, *idx, name(*idx)),
StoreDeref(idx) => w!(StoreDeref, *idx, cellname(*idx)),
DeleteFast(idx) => w!(DeleteFast, *idx, varname(*idx)),
DeleteLocal(idx) => w!(DeleteLocal, *idx, name(*idx)),
DeleteGlobal(idx) => w!(DeleteGlobal, *idx, name(*idx)),
DeleteDeref(idx) => w!(DeleteDeref, *idx, cellname(*idx)),
LoadClosure(i) => w!(LoadClosure, *i, cellname(*i)),
Subscript => w!(Subscript),
StoreSubscript => w!(StoreSubscript),
DeleteSubscript => w!(DeleteSubscript),
StoreAttr { idx } => w!(StoreAttr, name(*idx)),
DeleteAttr { idx } => w!(DeleteAttr, name(*idx)),
LoadConst { idx } => {
let value = &constants[*idx as usize];
match value.borrow_constant() {
BorrowedConstant::Code { code } if expand_codeobjects => {
writeln!(f, "{:20} ({:?}):", "LoadConst", code)?;
code.display_inner(f, true, level + 1)?;
Ok(())
}
c => {
write!(f, "{:20} (", "LoadConst")?;
c.fmt_display(f)?;
writeln!(f, ")")
}
}
}
UnaryOperation { op } => w!(UnaryOperation, format_args!("{:?}", op)),
BinaryOperation { op } => w!(BinaryOperation, format_args!("{:?}", op)),
BinaryOperationInplace { op } => {
w!(BinaryOperationInplace, format_args!("{:?}", op))