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bytecode.rs
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//! Implement python as a virtual machine with bytecodes. This module
//! implements bytecode structure.
/*
* Primitive instruction type, which can be encoded and decoded.
*/
use num_bigint::BigInt;
use num_complex::Complex64;
use rustpython_parser::ast;
use std::collections::{HashMap, HashSet};
use std::fmt;
/// Primary container of a single code object. Each python function has
/// a codeobject. Also a module has a codeobject.
#[derive(Clone, PartialEq)]
pub struct CodeObject {
pub instructions: Vec<Instruction>,
pub label_map: HashMap<Label, usize>,
pub locations: Vec<ast::Location>,
pub arg_names: Vec<String>, // Names of positional arguments
pub varargs: Option<Option<String>>, // *args or *
pub kwonlyarg_names: Vec<String>,
pub varkeywords: Option<Option<String>>, // **kwargs or **
pub source_path: String,
pub first_line_number: usize,
pub obj_name: String, // Name of the object that created this code object
pub is_generator: bool,
}
bitflags! {
pub struct FunctionOpArg: u8 {
const HAS_DEFAULTS = 0x01;
}
}
pub type Label = usize;
/// A Single bytecode instruction.
#[derive(Debug, Clone, PartialEq)]
pub enum Instruction {
Import {
name: String,
symbol: Option<String>,
},
ImportStar {
name: String,
},
LoadName {
name: String,
},
StoreName {
name: String,
},
DeleteName {
name: String,
},
StoreSubscript,
DeleteSubscript,
StoreAttr {
name: String,
},
DeleteAttr {
name: String,
},
LoadConst {
value: Constant,
},
UnaryOperation {
op: UnaryOperator,
},
BinaryOperation {
op: BinaryOperator,
inplace: bool,
},
LoadAttr {
name: String,
},
CompareOperation {
op: ComparisonOperator,
},
Pop,
Rotate {
amount: usize,
},
Duplicate,
GetIter,
Pass,
Continue,
Break,
Jump {
target: Label,
},
JumpIf {
target: Label,
},
JumpIfFalse {
target: Label,
},
MakeFunction {
flags: FunctionOpArg,
},
CallFunction {
typ: CallType,
},
ForIter {
target: Label,
},
ReturnValue,
YieldValue,
YieldFrom,
SetupLoop {
start: Label,
end: Label,
},
SetupExcept {
handler: Label,
},
SetupWith {
end: Label,
},
CleanupWith {
end: Label,
},
PopBlock,
Raise {
argc: usize,
},
BuildString {
size: usize,
},
BuildTuple {
size: usize,
unpack: bool,
},
BuildList {
size: usize,
unpack: bool,
},
BuildSet {
size: usize,
unpack: bool,
},
BuildMap {
size: usize,
unpack: bool,
},
BuildSlice {
size: usize,
},
ListAppend {
i: usize,
},
SetAdd {
i: usize,
},
MapAdd {
i: usize,
},
PrintExpr,
LoadBuildClass,
UnpackSequence {
size: usize,
},
UnpackEx {
before: usize,
after: usize,
},
Unpack,
FormatValue {
conversion: Option<ast::ConversionFlag>,
spec: String,
},
}
use self::Instruction::*;
#[derive(Debug, Clone, PartialEq)]
pub enum CallType {
Positional(usize),
Keyword(usize),
Ex(bool),
}
#[derive(Debug, Clone, PartialEq)]
pub enum Constant {
Integer { value: BigInt },
Float { value: f64 },
Complex { value: Complex64 },
Boolean { value: bool },
String { value: String },
Bytes { value: Vec<u8> },
Code { code: Box<CodeObject> },
Tuple { elements: Vec<Constant> },
None,
Ellipsis,
}
#[derive(Debug, Clone, PartialEq)]
pub enum ComparisonOperator {
Greater,
GreaterOrEqual,
Less,
LessOrEqual,
Equal,
NotEqual,
In,
NotIn,
Is,
IsNot,
}
#[derive(Debug, Clone, PartialEq)]
pub enum BinaryOperator {
Power,
Multiply,
MatrixMultiply,
Divide,
FloorDivide,
Modulo,
Add,
Subtract,
Subscript,
Lshift,
Rshift,
And,
Xor,
Or,
}
#[derive(Debug, Clone, PartialEq)]
pub enum UnaryOperator {
Not,
Invert,
Minus,
Plus,
}
/*
Maintain a stack of blocks on the VM.
pub enum BlockType {
Loop,
Except,
}
*/
impl CodeObject {
pub fn new(
arg_names: Vec<String>,
varargs: Option<Option<String>>,
kwonlyarg_names: Vec<String>,
varkeywords: Option<Option<String>>,
source_path: String,
first_line_number: usize,
obj_name: String,
) -> CodeObject {
CodeObject {
instructions: Vec::new(),
label_map: HashMap::new(),
locations: Vec::new(),
arg_names,
varargs,
kwonlyarg_names,
varkeywords,
source_path,
first_line_number,
obj_name,
is_generator: false,
}
}
pub fn get_constants(&self) -> impl Iterator<Item = &Constant> {
self.instructions.iter().filter_map(|x| {
if let Instruction::LoadConst { value } = x {
Some(value)
} else {
None
}
})
}
}
impl fmt::Display for CodeObject {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let label_targets: HashSet<&usize> = self.label_map.values().collect();
for (offset, instruction) in self.instructions.iter().enumerate() {
let arrow = if label_targets.contains(&offset) {
">>"
} else {
" "
};
write!(f, " {} {:5} ", arrow, offset)?;
instruction.fmt_dis(f, &self.label_map)?;
}
Ok(())
}
}
impl Instruction {
fn fmt_dis(&self, f: &mut fmt::Formatter, label_map: &HashMap<Label, usize>) -> fmt::Result {
macro_rules! w {
($variant:ident) => {
write!(f, "{:20}\n", stringify!($variant))
};
($variant:ident, $var:expr) => {
write!(f, "{:20} ({})\n", stringify!($variant), $var)
};
($variant:ident, $var1:expr, $var2:expr) => {
write!(f, "{:20} ({}, {})\n", stringify!($variant), $var1, $var2)
};
}
match self {
Import { name, symbol } => w!(Import, name, format!("{:?}", symbol)),
ImportStar { name } => w!(ImportStar, name),
LoadName { name } => w!(LoadName, name),
StoreName { name } => w!(StoreName, name),
DeleteName { name } => w!(DeleteName, name),
StoreSubscript => w!(StoreSubscript),
DeleteSubscript => w!(DeleteSubscript),
StoreAttr { name } => w!(StoreAttr, name),
DeleteAttr { name } => w!(DeleteAttr, name),
LoadConst { value } => w!(LoadConst, value),
UnaryOperation { op } => w!(UnaryOperation, format!("{:?}", op)),
BinaryOperation { op, inplace } => w!(BinaryOperation, format!("{:?}", op), inplace),
LoadAttr { name } => w!(LoadAttr, name),
CompareOperation { op } => w!(CompareOperation, format!("{:?}", op)),
Pop => w!(Pop),
Rotate { amount } => w!(Rotate, amount),
Duplicate => w!(Duplicate),
GetIter => w!(GetIter),
Pass => w!(Pass),
Continue => w!(Continue),
Break => w!(Break),
Jump { target } => w!(Jump, label_map[target]),
JumpIf { target } => w!(JumpIf, label_map[target]),
JumpIfFalse { target } => w!(JumpIfFalse, label_map[target]),
MakeFunction { flags } => w!(MakeFunction, format!("{:?}", flags)),
CallFunction { typ } => w!(CallFunction, format!("{:?}", typ)),
ForIter { target } => w!(ForIter, label_map[target]),
ReturnValue => w!(ReturnValue),
YieldValue => w!(YieldValue),
YieldFrom => w!(YieldFrom),
SetupLoop { start, end } => w!(SetupLoop, label_map[start], label_map[end]),
SetupExcept { handler } => w!(SetupExcept, handler),
SetupWith { end } => w!(SetupWith, end),
CleanupWith { end } => w!(CleanupWith, end),
PopBlock => w!(PopBlock),
Raise { argc } => w!(Raise, argc),
BuildString { size } => w!(BuildString, size),
BuildTuple { size, unpack } => w!(BuildTuple, size, unpack),
BuildList { size, unpack } => w!(BuildList, size, unpack),
BuildSet { size, unpack } => w!(BuildSet, size, unpack),
BuildMap { size, unpack } => w!(BuildMap, size, unpack),
BuildSlice { size } => w!(BuildSlice, size),
ListAppend { i } => w!(ListAppend, i),
SetAdd { i } => w!(SetAdd, i),
MapAdd { i } => w!(MapAdd, i),
PrintExpr => w!(PrintExpr),
LoadBuildClass => w!(LoadBuildClass),
UnpackSequence { size } => w!(UnpackSequence, size),
UnpackEx { before, after } => w!(UnpackEx, before, after),
Unpack => w!(Unpack),
FormatValue { spec, .. } => w!(FormatValue, spec), // TODO: write conversion
}
}
}
impl fmt::Display for Constant {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Constant::Integer { value } => write!(f, "{}", value),
Constant::Float { value } => write!(f, "{}", value),
Constant::Complex { value } => write!(f, "{}", value),
Constant::Boolean { value } => write!(f, "{}", value),
Constant::String { value } => write!(f, "{:?}", value),
Constant::Bytes { value } => write!(f, "{:?}", value),
Constant::Code { code } => write!(f, "{:?}", code),
Constant::Tuple { elements } => write!(
f,
"({})",
elements
.iter()
.map(|e| format!("{}", e))
.collect::<Vec<_>>()
.join(", ")
),
Constant::None => write!(f, "None"),
Constant::Ellipsis => write!(f, "Ellipsis"),
}
}
}
impl fmt::Debug for CodeObject {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"<code object {} at ??? file {:?}, line {}>",
self.obj_name, self.source_path, self.first_line_number
)
}
}