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Implement execution of finally block. Fixes #1306.

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Windel Bouwman 2019-08-27 21:16:59 +02:00
parent e8db01a09a
commit e37f117035
1 changed files with 20 additions and 11 deletions
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31
src/compile.rs
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@ -712,13 +712,13 @@ impl<O: OutputStream> Compiler<O> {
finalbody: &Option<ast::Suite>,
) -> Result<(), CompileError> {
let mut handler_label = self.new_label();
let finally_label = self.new_label();
let finally_handler_label = self.new_label();
let else_label = self.new_label();
// Setup a finally block if we have a finally statement.
if finalbody.is_some() {
self.emit(Instruction::SetupFinally {
handler: finally_label,
handler: finally_handler_label,
});
}
@ -773,26 +773,28 @@ impl<O: OutputStream> Compiler<O> {
// Handler code:
self.compile_statements(&handler.body)?;
self.emit(Instruction::PopException);
if finalbody.is_some() {
self.emit(Instruction::PopBlock); // pop finally block
// We enter the finally block, without exception.
self.emit(Instruction::EnterFinally);
}
self.emit(Instruction::Jump {
target: finally_label,
target: finally_handler_label,
});
// Emit a new label for the next handler
self.set_label(handler_label);
handler_label = self.new_label();
}
self.emit(Instruction::Jump {
target: handler_label,
});
self.set_label(handler_label);
// If code flows here, we have an unhandled exception,
// emit finally code and raise again!
// Duplicate finally code here:
// TODO: this bytecode is now duplicate, could this be
// improved?
if let Some(statements) = finalbody {
self.compile_statements(statements)?;
}
// raise the exception again!
self.emit(Instruction::Raise { argc: 0 });
// We successfully ran the try block:
@ -802,8 +804,15 @@ impl<O: OutputStream> Compiler<O> {
self.compile_statements(statements)?;
}
if finalbody.is_some() {
self.emit(Instruction::PopBlock); // pop finally block
// We enter the finally block, without return / exception.
self.emit(Instruction::EnterFinally);
}
// finally:
self.set_label(finally_label);
self.set_label(finally_handler_label);
if let Some(statements) = finalbody {
self.compile_statements(statements)?;
self.emit(Instruction::EndFinally);