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convert.rs
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// A function which takes CPython bytecode (from json) and transforms
// this into RustPython bytecode. This to decouple RustPython from CPython
// internal bytecode representations.
use rustpython_vm::bytecode;
use py_code_object::{PyCodeObject, NativeType};
pub fn convert(cpython_bytecode: PyCodeObject) -> bytecode::CodeObject {
let mut c = Converter::new();
c.convert(cpython_bytecode);
c.code2
}
// TODO: think of an appropriate name for this thing:
pub struct Converter {
code: Option<PyCodeObject>,
code2: bytecode::CodeObject,
}
impl Converter {
pub fn new() -> Converter {
Converter {
code: None,
code2: bytecode::CodeObject::new(),
}
}
pub fn convert(&mut self, code: PyCodeObject) {
// self.code = Some(code);
for op_code in &code.co_code {
self.dispatch(&code, op_code);
}
}
fn dispatch(&mut self, code: &PyCodeObject, op_code: &(usize, String, Option<usize>)) {
debug!("Converting op code: {:?}", op_code);
match (op_code.1.as_ref(), op_code.2) {
("LOAD_CONST", Some(consti)) => {
// println!("Loading const at index: {}", consti);
let cons = &code.co_consts[consti];
let value = match cons {
// NativeType::Boolean { value } => { bytecode::Constant::Boolean { true } },
NativeType::Int { 0: value } => { bytecode::Constant::Integer { value: *value } },
NativeType::Str { 0: ref value } => { bytecode::Constant::String { value: value.clone() } }
NativeType::NoneType => { bytecode::Constant::None }
_ => { panic!("Not impl {:?}", cons); }
};
self.emit(bytecode::Instruction::LoadConst { value: value });
},
// TODO: universal stack element type
("LOAD_CONST", None) => {
self.emit(bytecode::Instruction::LoadConst { value: bytecode::Constant::None });
},
("POP_TOP", None) => {
self.emit(bytecode::Instruction::Pop);
},
("STORE_NAME", Some(namei)) => {
// println!("Loading const at index: {}", consti);
let name = code.co_names[namei].clone();
self.emit(bytecode::Instruction::StoreName { name });
},
("LOAD_NAME", Some(namei)) => {
// println!("Loading const at index: {}", consti);
let name = code.co_names[namei].clone();
self.emit(bytecode::Instruction::LoadName { name });
},
("LOAD_GLOBAL", Some(namei)) => {
// We need to load the underlying value the name points to, but stuff like
// AssertionError is in the names right after compile, so we load the string
// instead for now
// let curr_frame = self.curr_frame();
// let name = &curr_frame.code.co_names[namei];
},
("BUILD_LIST", Some(count)) => {
self.emit(bytecode::Instruction::BuildList { size: count });
},
("BUILD_SLICE", Some(count)) => {
assert!(count == 2 || count == 3);
self.emit(bytecode::Instruction::BuildSlice { size: count });
},
("GET_ITER", None) => {
self.emit(bytecode::Instruction::GetIter);
},
("FOR_ITER", Some(delta)) => {
self.emit(bytecode::Instruction::ForIter);
},
("COMPARE_OP", Some(cmp_op_i)) => {
let op = match cmp_op_i {
0 => bytecode::ComparisonOperator::Less,
1 => bytecode::ComparisonOperator::LessOrEqual,
2 => bytecode::ComparisonOperator::Equal,
3 => bytecode::ComparisonOperator::NotEqual,
4 => bytecode::ComparisonOperator::Greater,
5 => bytecode::ComparisonOperator::GreaterOrEqual,
_ => { panic!("Not impl {:?}", cmp_op_i); }
};
self.emit(bytecode::Instruction::CompareOperation { op: op} );
},
("POP_JUMP_IF_TRUE", Some(ref target)) => {
self.emit(bytecode::Instruction::JumpIf { target: *target} );
}
/*
("POP_JUMP_IF_FALSE", Some(ref target)) => {
// Convert into two internal bytecodes:
self.emit(bytecode::Instruction::UnaryOperation { op: bytecode::UnaryOperation::Not } );
self.emit(bytecode::Instruction::JumpIf { target: target} );
}*/
/*
("JUMP_FORWARD", Some(ref delta)) => {
let curr_frame = self.curr_frame();
let last_offset = curr_frame.get_bytecode_offset().unwrap();
curr_frame.lasti = curr_frame.labels.get(&(last_offset + delta)).unwrap().clone();
None
},
("JUMP_ABSOLUTE", Some(ref target)) => {
let curr_frame = self.curr_frame();
curr_frame.lasti = curr_frame.labels.get(target).unwrap().clone();
None
},
("BREAK_LOOP", None) => {
// Do we still need to return the why if we use unwind from jsapy?
self.unwind("break".to_string());
None //?
},
*/
("RAISE_VARARGS", Some(argc)) => {
self.emit(bytecode::Instruction::Raise { argc: argc });
}
/*
("INPLACE_ADD", None) => {
self.emit(bytecode::Instruction::BinaryOperation { op: BinaryOperator::Add });
},
("STORE_SUBSCR", None) => {
let curr_frame = self.curr_frame();
let tos = curr_frame.stack.pop().unwrap();
let tos1 = curr_frame.stack.pop().unwrap();
let tos2 = curr_frame.stack.pop().unwrap();
match (tos1.deref(), tos.deref()) {
(&NativeType::List(ref refl), &NativeType::Int(index)) => {
refl.borrow_mut()[index as usize] = (*tos2).clone();
},
(&NativeType::Str(_), &NativeType::Int(_)) => {
// TODO: raise TypeError: 'str' object does not support item assignment
panic!("TypeError: 'str' object does not support item assignment")
},
_ => panic!("TypeError in STORE_SUBSCR")
}
curr_frame.stack.push(tos1);
},
*/
("BINARY_ADD", None) => {
self.emit(bytecode::Instruction::BinaryOperation { op: bytecode::BinaryOperator::Add });
},
("BINARY_POWER", None) => {
self.emit(bytecode::Instruction::BinaryOperation { op: b
7A55
ytecode::BinaryOperator::Power });
},
("BINARY_MULTIPLY", None) => {
self.emit(bytecode::Instruction::BinaryOperation { op: bytecode::BinaryOperator::Multiply });
},
("BINARY_TRUE_DIVIDE", None) => {
self.emit(bytecode::Instruction::BinaryOperation { op: bytecode::BinaryOperator::Divide });
},
("BINARY_MODULO", None) => {
self.emit(bytecode::Instruction::BinaryOperation { op: bytecode::BinaryOperator::Modulo });
},
("BINARY_SUBTRACT", None) => {
self.emit(bytecode::Instruction::BinaryOperation { op: bytecode::BinaryOperator::Subtract });
},
("BINARY_SUBSCR", None) => {
self.emit(bytecode::Instruction::BinaryOperation { op: bytecode::BinaryOperator::Subscript });
},
("ROT_TWO", None) => {
self.emit(bytecode::Instruction::Rotate { amount: 2 });
}
("UNARY_NEGATIVE", None) => {
self.emit(bytecode::Instruction::UnaryOperation { op: bytecode::UnaryOperator::Minus });
},
("UNARY_POSITIVE", None) => {
self.emit(bytecode::Instruction::UnaryOperation { op: bytecode::UnaryOperator::Plus });
},
/*
("PRINT_ITEM", None) => {
// TODO: Print without the (...)
println!("{:?}", curr_frame.stack.pop().unwrap());
},
("PRINT_NEWLINE", None) => {
print!("\n");
},*/
/*
("MAKE_FUNCTION", Some(argc)) => {
// https://docs.python.org/3.4/library/dis.html#opcode-MAKE_FUNCTION
self.emit(bytecode::Instruction::MakeFunction { });
},
*/
("CALL_FUNCTION", Some(argc)) => {
let kw_count = (argc >> 8) as u8;
let pos_count = (argc & 0xFF) as usize;
self.emit(bytecode::Instruction::CallFunction { count: pos_count });
},
("RETURN_VALUE", None) => {
self.emit(bytecode::Instruction::ReturnValue);
},
/*
("SETUP_LOOP", Some(delta)) => {
let curr_frame = self.curr_frame();
let curr_offset = curr_frame.get_bytecode_offset().unwrap();
curr_frame.blocks.push(Block {
block_type: "loop".to_string(),
handler: *curr_frame.labels.get(&(curr_offset + delta)).unwrap(),
});
},
*/
("POP_BLOCK", None) => {
self.emit(bytecode::Instruction::PopBlock);
}
("SetLineno", _) | ("LABEL", _)=> {
// Skip
},
(name, _) => {
panic!("Unrecongnizable op code: {}", name);
}
} // end match
} // end dispatch function
fn emit(&mut self, instruction: bytecode::Instruction) {
self.code2.instructions.push(instruction);
}
}