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2845 lines (2544 loc) · 95.6 KB
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//!
//! Take an AST and transform it into bytecode
//!
//! Inspirational code:
//! <https://github.com/python/cpython/blob/main/Python/compile.c>
//! <https://github.com/micropython/micropython/blob/master/py/compile.c>
use crate::ir::{self, CodeInfo};
pub use crate::mode::Mode;
use crate::symboltable::{make_symbol_table, make_symbol_table_expr, SymbolScope, SymbolTable};
use crate::IndexSet;
use crate::{
error::{CompileError, CompileErrorType},
symboltable,
};
use itertools::Itertools;
use num_complex::Complex64;
use num_traits::ToPrimitive;
use rustpython_ast as ast;
use rustpython_bytecode::{self as bytecode, CodeObject, ConstantData, Instruction};
use std::borrow::Cow;
type CompileResult<T> = Result<T, CompileError>;
#[derive(PartialEq, Eq, Clone, Copy)]
enum NameUsage {
Load,
Store,
Delete,
}
enum CallType {
Positional { nargs: u32 },
Keyword { nargs: u32 },
Ex { has_kwargs: bool },
}
impl CallType {
fn normal_call(self) -> Instruction {
match self {
CallType::Positional { nargs } => Instruction::CallFunctionPositional { nargs },
CallType::Keyword { nargs } => Instruction::CallFunctionKeyword { nargs },
CallType::Ex { has_kwargs } => Instruction::CallFunctionEx { has_kwargs },
}
}
fn method_call(self) -> Instruction {
match self {
CallType::Positional { nargs } => Instruction::CallMethodPositional { nargs },
CallType::Keyword { nargs } => Instruction::CallMethodKeyword { nargs },
CallType::Ex { has_kwargs } => Instruction::CallMethodEx { has_kwargs },
}
}
}
fn is_forbidden_name(name: &str) -> bool {
// See https://docs.python.org/3/library/constants.html#built-in-constants
const BUILTIN_CONSTANTS: &[&str] = &["__debug__"];
BUILTIN_CONSTANTS.contains(&name)
}
/// Main structure holding the state of compilation.
struct Compiler {
code_stack: Vec<CodeInfo>,
symbol_table_stack: Vec<SymbolTable>,
source_path: String,
current_source_location: ast::Location,
qualified_path: Vec<String>,
done_with_future_stmts: bool,
future_annotations: bool,
ctx: CompileContext,
class_name: Option<String>,
opts: CompileOpts,
}
#[derive(Debug, Clone, Default)]
pub struct CompileOpts {
/// How optimized the bytecode output should be; any optimize > 0 does
/// not emit assert statements
pub optimize: u8,
}
#[derive(Debug, Clone, Copy)]
struct CompileContext {
loop_data: Option<(ir::BlockIdx, ir::BlockIdx)>,
in_class: bool,
func: FunctionContext,
}
#[derive(Debug, Clone, Copy, PartialEq)]
enum FunctionContext {
NoFunction,
Function,
AsyncFunction,
}
impl CompileContext {
fn in_func(self) -> bool {
self.func != FunctionContext::NoFunction
}
}
/// Compile an ast::Mod produced from rustpython_parser::parser::parse()
pub fn compile_top(
ast: &ast::Mod,
source_path: String,
mode: Mode,
opts: CompileOpts,
) -> CompileResult<CodeObject> {
match ast {
ast::Mod::Module { body, .. } => compile_program(body, source_path, opts),
ast::Mod::Interactive { body } => match mode {
Mode::Single => compile_program_single(body, source_path, opts),
Mode::BlockExpr => compile_block_expression(body, source_path, opts),
_ => unreachable!("only Single and BlockExpr parsed to Interactive"),
},
ast::Mod::Expression { body } => compile_expression(body, source_path, opts),
ast::Mod::FunctionType { .. } => panic!("can't compile a FunctionType"),
}
}
/// A helper function for the shared code of the different compile functions
fn compile_impl<Ast: ?Sized>(
ast: &Ast,
source_path: String,
opts: CompileOpts,
make_symbol_table: impl FnOnce(&Ast) -> Result<SymbolTable, symboltable::SymbolTableError>,
compile: impl FnOnce(&mut Compiler, &Ast, SymbolTable) -> CompileResult<()>,
) -> CompileResult<CodeObject> {
let symbol_table = match make_symbol_table(ast) {
Ok(x) => x,
Err(e) => return Err(e.into_compile_error(source_path)),
};
let mut compiler = Compiler::new(opts, source_path, "<module>".to_owned());
compile(&mut compiler, ast, symbol_table)?;
let code = compiler.pop_code_object();
trace!("Compilation completed: {:?}", code);
Ok(code)
}
/// Compile a standard Python program to bytecode
pub fn compile_program(
ast: &[ast::Stmt],
source_path: String,
opts: CompileOpts,
) -> CompileResult<CodeObject> {
compile_impl(
ast,
source_path,
opts,
make_symbol_table,
Compiler::compile_program,
)
}
/// Compile a Python program to bytecode for the context of a REPL
pub fn compile_program_single(
ast: &[ast::Stmt],
source_path: String,
opts: CompileOpts,
) -> CompileResult<CodeObject> {
compile_impl(
ast,
source_path,
opts,
make_symbol_table,
Compiler::compile_program_single,
)
}
pub fn compile_block_expression(
ast: &[ast::Stmt],
source_path: String,
opts: CompileOpts,
) -> CompileResult<CodeObject> {
compile_impl(
ast,
source_path,
opts,
make_symbol_table,
Compiler::compile_block_expr,
)
}
pub fn compile_expression(
ast: &ast::Expr,
source_path: String,
opts: CompileOpts,
) -> CompileResult<CodeObject> {
compile_impl(
ast,
source_path,
opts,
make_symbol_table_expr,
Compiler::compile_eval,
)
}
impl Compiler {
fn new(opts: CompileOpts, source_path: String, code_name: String) -> Self {
let module_code = CodeInfo {
flags: bytecode::CodeFlags::NEW_LOCALS,
posonlyarg_count: 0,
arg_count: 0,
kwonlyarg_count: 0,
source_path: source_path.clone(),
first_line_number: 0,
obj_name: code_name,
blocks: vec![ir::Block::default()],
current_block: bytecode::Label(0),
constants: IndexSet::default(),
name_cache: IndexSet::default(),
varname_cache: IndexSet::default(),
cellvar_cache: IndexSet::default(),
freevar_cache: IndexSet::default(),
};
Compiler {
code_stack: vec![module_code],
symbol_table_stack: Vec::new(),
source_path,
current_source_location: ast::Location::default(),
qualified_path: Vec::new(),
done_with_future_stmts: false,
future_annotations: false,
ctx: CompileContext {
loop_data: None,
in_class: false,
func: FunctionContext::NoFunction,
},
class_name: None,
opts,
}
}
fn error(&self, error: CompileErrorType) -> CompileError {
self.error_loc(error, self.current_source_location)
}
fn error_loc(&self, error: CompileErrorType, location: ast::Location) -> CompileError {
CompileError {
error,
location,
source_path: self.source_path.clone(),
}
}
fn push_output(
&mut self,
flags: bytecode::CodeFlags,
posonlyarg_count: usize,
arg_count: usize,
kwonlyarg_count: usize,
obj_name: String,
) {
let source_path = self.source_path.clone();
let first_line_number = self.get_source_line_number();
let table = self
.symbol_table_stack
.last_mut()
.unwrap()
.sub_tables
.remove(0);
let cellvar_cache = table
.symbols
.iter()
.filter(|(_, s)| s.scope == SymbolScope::Cell)
.map(|(var, _)| var.clone())
.collect();
let freevar_cache = table
.symbols
.iter()
.filter(|(_, s)| s.scope == SymbolScope::Free || s.is_free_class)
.map(|(var, _)| var.clone())
.collect();
self.symbol_table_stack.push(table);
let info = CodeInfo {
flags,
posonlyarg_count,
arg_count,
kwonlyarg_count,
source_path,
first_line_number,
obj_name,
blocks: vec![ir::Block::default()],
current_block: bytecode::Label(0),
constants: IndexSet::default(),
name_cache: IndexSet::default(),
varname_cache: IndexSet::default(),
cellvar_cache,
freevar_cache,
};
self.code_stack.push(info);
}
fn pop_code_object(&mut self) -> CodeObject {
let table = self.symbol_table_stack.pop().unwrap();
assert!(table.sub_tables.is_empty());
self.code_stack
.pop()
.unwrap()
.finalize_code(self.opts.optimize)
}
// could take impl Into<Cow<str>>, but everything is borrowed from ast structs; we never
// actually have a `String` to pass
fn name(&mut self, name: &str) -> bytecode::NameIdx {
self._name_inner(name, |i| &mut i.name_cache)
}
fn varname(&mut self, name: &str) -> bytecode::NameIdx {
self._name_inner(name, |i| &mut i.varname_cache)
}
fn _name_inner(
&mut self,
name: &str,
cache: impl FnOnce(&mut CodeInfo) -> &mut IndexSet<String>,
) -> bytecode::NameIdx {
let name = self.mangle(name);
let cache = cache(self.current_codeinfo());
cache
.get_index_of(name.as_ref())
.unwrap_or_else(|| cache.insert_full(name.into_owned()).0) as u32
}
fn compile_program(
&mut self,
body: &[ast::Stmt],
symbol_table: SymbolTable,
) -> CompileResult<()> {
let size_before = self.code_stack.len();
self.symbol_table_stack.push(symbol_table);
let (doc, statements) = split_doc(body);
if let Some(value) = doc {
self.emit_constant(ConstantData::Str { value });
let doc = self.name("__doc__");
self.emit(Instruction::StoreGlobal(doc))
}
if self.find_ann(statements) {
self.emit(Instruction::SetupAnnotation);
}
self.compile_statements(statements)?;
assert_eq!(self.code_stack.len(), size_before);
// Emit None at end:
self.emit_constant(ConstantData::None);
self.emit(Instruction::ReturnValue);
Ok(())
}
fn compile_program_single(
&mut self,
body: &[ast::Stmt],
symbol_table: SymbolTable,
) -> CompileResult<()> {
self.symbol_table_stack.push(symbol_table);
if let Some((last, body)) = body.split_last() {
for statement in body {
if let ast::StmtKind::Expr { value } = &statement.node {
self.compile_expression(value)?;
self.emit(Instruction::PrintExpr);
} else {
self.compile_statement(statement)?;
}
}
if let ast::StmtKind::Expr { value } = &last.node {
self.compile_expression(value)?;
self.emit(Instruction::Duplicate);
self.emit(Instruction::PrintExpr);
} else {
self.compile_statement(last)?;
self.emit_constant(ConstantData::None);
}
} else {
self.emit_constant(ConstantData::None);
};
self.emit(Instruction::ReturnValue);
Ok(())
}
fn compile_block_expr(
&mut self,
body: &[ast::Stmt],
symbol_table: SymbolTable,
) -> CompileResult<()> {
self.symbol_table_stack.push(symbol_table);
self.compile_statements(body)?;
if let Some(last_statement) = body.last() {
match last_statement.node {
ast::StmtKind::Expr { .. } => {
self.current_block().instructions.pop(); // pop Instruction::Pop
}
ast::StmtKind::FunctionDef { .. }
| ast::StmtKind::AsyncFunctionDef { .. }
| ast::StmtKind::ClassDef { .. } => {
let store_inst = self.current_block().instructions.pop().unwrap(); // pop Instruction::Store
self.emit(Instruction::Duplicate);
self.current_block().instructions.push(store_inst);
}
_ => self.emit_constant(ConstantData::None),
}
}
self.emit(Instruction::ReturnValue);
Ok(())
}
// Compile statement in eval mode:
fn compile_eval(
&mut self,
expression: &ast::Expr,
symbol_table: SymbolTable,
) -> CompileResult<()> {
self.symbol_table_stack.push(symbol_table);
self.compile_expression(expression)?;
self.emit(Instruction::ReturnValue);
Ok(())
}
fn compile_statements(&mut self, statements: &[ast::Stmt]) -> CompileResult<()> {
for statement in statements {
self.compile_statement(statement)?
}
Ok(())
}
fn load_name(&mut self, name: &str) -> CompileResult<()> {
self.compile_name(name, NameUsage::Load)
}
fn store_name(&mut self, name: &str) -> CompileResult<()> {
self.compile_name(name, NameUsage::Store)
}
fn mangle<'a>(&self, name: &'a str) -> Cow<'a, str> {
symboltable::mangle_name(self.class_name.as_deref(), name)
}
fn check_forbidden_name(&self, name: &str, usage: NameUsage) -> CompileResult<()> {
let msg = match usage {
NameUsage::Store if is_forbidden_name(name) => "cannot assign to",
NameUsage::Delete if is_forbidden_name(name) => "cannot delete",
_ => return Ok(()),
};
Err(self.error(CompileErrorType::SyntaxError(format!("{} {}", msg, name))))
}
fn compile_name(&mut self, name: &str, usage: NameUsage) -> CompileResult<()> {
let name = self.mangle(name);
self.check_forbidden_name(&name, usage)?;
let symbol_table = self.symbol_table_stack.last().unwrap();
let symbol = symbol_table.lookup(name.as_ref()).expect(
"The symbol must be present in the symbol table, even when it is undefined in python.",
);
let info = self.code_stack.last_mut().unwrap();
let mut cache = &mut info.name_cache;
enum NameOpType {
Fast,
Global,
Deref,
Local,
}
let op_typ = match symbol.scope {
SymbolScope::Local if self.ctx.in_func() => {
cache = &mut info.varname_cache;
NameOpType::Fast
}
SymbolScope::GlobalExplicit => NameOpType::Global,
SymbolScope::GlobalImplicit | SymbolScope::Unknown if self.ctx.in_func() => {
NameOpType::Global
}
SymbolScope::GlobalImplicit | SymbolScope::Unknown => NameOpType::Local,
SymbolScope::Local => NameOpType::Local,
SymbolScope::Free => {
cache = &mut info.freevar_cache;
NameOpType::Deref
}
SymbolScope::Cell => {
cache = &mut info.cellvar_cache;
NameOpType::Deref
}
// // TODO: is this right?
// SymbolScope::Unknown => NameOpType::Global,
};
let mut idx = cache
.get_index_of(name.as_ref())
.unwrap_or_else(|| cache.insert_full(name.into_owned()).0);
if let SymbolScope::Free = symbol.scope {
idx += info.cellvar_cache.len();
}
let op = match op_typ {
NameOpType::Fast => match usage {
NameUsage::Load => Instruction::LoadFast,
NameUsage::Store => Instruction::StoreFast,
NameUsage::Delete => Instruction::DeleteFast,
},
NameOpType::Global => match usage {
NameUsage::Load => Instruction::LoadGlobal,
NameUsage::Store => Instruction::StoreGlobal,
NameUsage::Delete => Instruction::DeleteGlobal,
},
NameOpType::Deref => match usage {
NameUsage::Load if !self.ctx.in_func() && self.ctx.in_class => {
Instruction::LoadClassDeref
}
NameUsage::Load => Instruction::LoadDeref,
NameUsage::Store => Instruction::StoreDeref,
NameUsage::Delete => Instruction::DeleteDeref,
},
NameOpType::Local => match usage {
NameUsage::Load => Instruction::LoadNameAny,
NameUsage::Store => Instruction::StoreLocal,
NameUsage::Delete => Instruction::DeleteLocal,
},
};
self.emit(op(idx as u32));
Ok(())
}
fn compile_statement(&mut self, statement: &ast::Stmt) -> CompileResult<()> {
trace!("Compiling {:?}", statement);
self.set_source_location(statement.location);
use ast::StmtKind::*;
match &statement.node {
// we do this here because `from __future__` still executes that `from` statement at runtime,
// we still need to compile the ImportFrom down below
ImportFrom { module, names, .. } if module.as_deref() == Some("__future__") => {
self.compile_future_features(names)?
}
// if we find any other statement, stop accepting future statements
_ => self.done_with_future_stmts = true,
}
match &statement.node {
Import { names } => {
// import a, b, c as d
for name in names {
self.emit_constant(ConstantData::Integer {
value: num_traits::Zero::zero(),
});
self.emit_constant(ConstantData::None);
let idx = self.name(&name.name);
self.emit(Instruction::ImportName { idx });
if let Some(alias) = &name.asname {
for part in name.name.split('.').skip(1) {
let idx = self.name(part);
self.emit(Instruction::LoadAttr { idx });
}
self.store_name(alias)?
} else {
self.store_name(name.name.split('.').next().unwrap())?
}
}
}
ImportFrom {
level,
module,
names,
} => {
let import_star = names.iter().any(|n| n.name == "*");
let from_list = if import_star {
if self.ctx.in_func() {
return Err(self
.error_loc(CompileErrorType::FunctionImportStar, statement.location));
}
vec![ConstantData::Str {
value: "*".to_owned(),
}]
} else {
names
.iter()
.map(|n| ConstantData::Str {
value: n.name.to_owned(),
})
.collect()
};
let module_idx = module.as_ref().map(|s| self.name(s));
// from .... import (*fromlist)
self.emit_constant(ConstantData::Integer {
value: (*level).into(),
});
self.emit_constant(ConstantData::Tuple {
elements: from_list,
});
if let Some(idx) = module_idx {
self.emit(Instruction::ImportName { idx });
} else {
self.emit(Instruction::ImportNameless);
}
if import_star {
// from .... import *
self.emit(Instruction::ImportStar);
} else {
// from mod import a, b as c
for name in names {
let idx = self.name(&name.name);
// import symbol from module:
self.emit(Instruction::ImportFrom { idx });
// Store module under proper name:
if let Some(alias) = &name.asname {
self.store_name(alias)?
} else {
self.store_name(&name.name)?
}
}
// Pop module from stack:
self.emit(Instruction::Pop);
}
}
Expr { value } => {
self.compile_expression(value)?;
// Pop result of stack, since we not use it:
self.emit(Instruction::Pop);
}
Global { .. } | Nonlocal { .. } => {
// Handled during symbol table construction.
}
If { test, body, orelse } => {
let after_block = self.new_block();
if orelse.is_empty() {
// Only if:
self.compile_jump_if(test, false, after_block)?;
self.compile_statements(body)?;
} else {
// if - else:
let else_block = self.new_block();
self.compile_jump_if(test, false, else_block)?;
self.compile_statements(body)?;
self.emit(Instruction::Jump {
target: after_block,
});
// else:
self.switch_to_block(else_block);
self.compile_statements(orelse)?;
}
self.switch_to_block(after_block);
}
While { test, body, orelse } => self.compile_while(test, body, orelse)?,
With { items, body, .. } => self.compile_with(items, body, false)?,
AsyncWith { items, body, .. } => self.compile_with(items, body, true)?,
For {
target,
iter,
body,
orelse,
..
} => self.compile_for(target, iter, body, orelse, false)?,
AsyncFor {
target,
iter,
body,
orelse,
..
} => self.compile_for(target, iter, body, orelse, true)?,
Raise { exc, cause } => {
let kind = match exc {
Some(value) => {
self.compile_expression(value)?;
match cause {
Some(cause) => {
self.compile_expression(cause)?;
bytecode::RaiseKind::RaiseCause
}
None => bytecode::RaiseKind::Raise,
}
}
None => bytecode::RaiseKind::Reraise,
};
self.emit(Instruction::Raise { kind });
}
Try {
body,
handlers,
orelse,
finalbody,
} => self.compile_try_statement(body, handlers, orelse, finalbody)?,
FunctionDef {
name,
args,
body,
decorator_list,
returns,
..
} => self.compile_function_def(
name,
args,
body,
decorator_list,
returns.as_deref(),
false,
)?,
AsyncFunctionDef {
name,
args,
body,
decorator_list,
returns,
..
} => self.compile_function_def(
name,
args,
body,
decorator_list,
returns.as_deref(),
true,
)?,
ClassDef {
name,
body,
bases,
keywords,
decorator_list,
} => self.compile_class_def(name, body, bases, keywords, decorator_list)?,
Assert { test, msg } => {
// if some flag, ignore all assert statements!
if self.opts.optimize == 0 {
let after_block = self.new_block();
self.compile_jump_if(test, true, after_block)?;
let assertion_error = self.name("AssertionError");
self.emit(Instruction::LoadGlobal(assertion_error));
match msg {
Some(e) => {
self.compile_expression(e)?;
self.emit(Instruction::CallFunctionPositional { nargs: 1 });
}
None => {
self.emit(Instruction::CallFunctionPositional { nargs: 0 });
}
}
self.emit(Instruction::Raise {
kind: bytecode::RaiseKind::Raise,
});
self.switch_to_block(after_block);
}
}
Break => match self.ctx.loop_data {
Some((_, end)) => {
self.emit(Instruction::Break { target: end });
}
None => {
return Err(self.error_loc(CompileErrorType::InvalidBreak, statement.location));
}
},
Continue => match self.ctx.loop_data {
Some((start, _)) => {
self.emit(Instruction::Continue { target: start });
}
None => {
return Err(
self.error_loc(CompileErrorType::InvalidContinue, statement.location)
);
}
},
Return { value } => {
if !self.ctx.in_func() {
return Err(self.error_loc(CompileErrorType::InvalidReturn, statement.location));
}
match value {
Some(v) => {
if self.ctx.func == FunctionContext::AsyncFunction
&& self
.current_codeinfo()
.flags
.contains(bytecode::CodeFlags::IS_GENERATOR)
{
return Err(self.error_loc(
CompileErrorType::AsyncReturnValue,
statement.location,
));
}
self.compile_expression(v)?;
}
None => {
self.emit_constant(ConstantData::None);
}
}
self.emit(Instruction::ReturnValue);
}
Assign { targets, value, .. } => {
self.compile_expression(value)?;
for (i, target) in targets.iter().enumerate() {
if i + 1 != targets.len() {
self.emit(Instruction::Duplicate);
}
self.compile_store(target)?;
}
}
AugAssign { target, op, value } => self.compile_augassign(target, op, value)?,
AnnAssign {
target,
annotation,
value,
..
} => self.compile_annotated_assign(target, annotation, value.as_deref())?,
Delete { targets } => {
for target in targets {
self.compile_delete(target)?;
}
}
Pass => {
// No need to emit any code here :)
}
}
Ok(())
}
fn compile_delete(&mut self, expression: &ast::Expr) -> CompileResult<()> {
match &expression.node {
ast::ExprKind::Name { id, .. } => self.compile_name(id, NameUsage::Delete)?,
ast::ExprKind::Attribute { value, attr, .. } => {
self.check_forbidden_name(attr, NameUsage::Delete)?;
self.compile_expression(value)?;
let idx = self.name(attr);
self.emit(Instruction::DeleteAttr { idx });
}
ast::ExprKind::Subscript { value, slice, .. } => {
self.compile_expression(value)?;
self.compile_expression(slice)?;
self.emit(Instruction::DeleteSubscript);
}
ast::ExprKind::Tuple { elts, .. } | ast::ExprKind::List { elts, .. } => {
for element in elts {
self.compile_delete(element)?;
}
}
ast::ExprKind::BinOp { .. } | ast::ExprKind::UnaryOp { .. } => {
return Err(self.error(CompileErrorType::Delete("expression")))
}
_ => return Err(self.error(CompileErrorType::Delete(expression.node.name()))),
}
Ok(())
}
fn enter_function(
&mut self,
name: &str,
args: &ast::Arguments,
) -> CompileResult<bytecode::MakeFunctionFlags> {
let have_defaults = !args.defaults.is_empty();
if have_defaults {
// Construct a tuple:
let size = args.defaults.len() as u32;
for element in &args.defaults {
self.compile_expression(element)?;
}
self.emit(Instruction::BuildTuple {
size,
unpack: false,
});
}
let mut num_kw_only_defaults = 0;
for (kw, default) in args.kwonlyargs.iter().zip(&args.kw_defaults) {
if let Some(default) = default {
self.emit_constant(ConstantData::Str {
value: kw.node.arg.clone(),
});
self.compile_expression(default)?;
num_kw_only_defaults += 1;
}
}
if num_kw_only_defaults > 0 {
self.emit(Instruction::BuildMap {
size: num_kw_only_defaults,
unpack: false,
for_call: false,
});
}
let mut funcflags = bytecode::MakeFunctionFlags::empty();
if have_defaults {
funcflags |= bytecode::MakeFunctionFlags::DEFAULTS;
}
if num_kw_only_defaults > 0 {
funcflags |= bytecode::MakeFunctionFlags::KW_ONLY_DEFAULTS;
}
self.push_output(
bytecode::CodeFlags::NEW_LOCALS | bytecode::CodeFlags::IS_OPTIMIZED,
args.posonlyargs.len(),
args.posonlyargs.len() + args.args.len(),
args.kwonlyargs.len(),
name.to_owned(),
);
let args_iter = std::iter::empty()
.chain(&args.posonlyargs)
.chain(&args.args)
.chain(&args.kwonlyargs);
for name in args_iter {
if Compiler::is_forbidden_arg_name(&name.node.arg) {
return Err(self.error(CompileErrorType::SyntaxError(format!(
"cannot assign to {}",
&name.node.arg
))));
}
self.varname(&name.node.arg);
}
let mut compile_varargs = |va: Option<&ast::Arg>, flag| {
if let Some(name) = va {
self.current_codeinfo().flags |= flag;
self.varname(&name.node.arg);
}
};
compile_varargs(args.vararg.as_deref(), bytecode::CodeFlags::HAS_VARARGS);
compile_varargs(args.kwarg.as_deref(), bytecode::CodeFlags::HAS_VARKEYWORDS);
Ok(funcflags)
}
fn prepare_decorators(&mut self, decorator_list: &[ast::Expr]) -> CompileResult<()> {
for decorator in decorator_list {
self.compile_expression(decorator)?;
}
Ok(())
}
fn apply_decorators(&mut self, decorator_list: &[ast::Expr]) {
// Apply decorators:
for _ in decorator_list {
self.emit(Instruction::CallFunctionPositional { nargs: 1 });
}
}
fn compile_try_statement(
&mut self,
body: &[ast::Stmt],
handlers: &[ast::Excepthandler],
orelse: &[ast::Stmt],
finalbody: &[ast::Stmt],
) -> CompileResult<()> {
let handler_block = self.new_block();
let finally_block = self.new_block();
// Setup a finally block if we have a finally statement.
if !finalbody.is_empty() {
self.emit(Instruction::SetupFinally {
handler: finally_block,
});
}
let else_block = self.new_block();
// try:
self.emit(Instruction::SetupExcept {
handler: handler_block,
});
self.compile_statements(body)?;
self.emit(Instruction::PopBlock);
self.emit(Instruction::Jump { target: else_block });
// except handlers:
self.switch_to_block(handler_block);
// Exception is on top of stack now
for handler in handlers {
let ast::ExcepthandlerKind::ExceptHandler { type_, name, body } = &handler.node;
let next_handler = self.new_block();
// If we gave a typ,
// check if this handler can handle the exception:
if let Some(exc_type) = type_ {
// Duplicate exception for test:
self.emit(Instruction::Duplicate);
// Check exception type:
self.compile_expression(exc_type)?;
self.emit(Instruction::TestOperation {
op: bytecode::TestOperator::ExceptionMatch,