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(WIP) implement async for function #2999

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(WIP) implement async for function #2999

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49 changes: 36 additions & 13 deletions compiler/codegen/src/compile.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2654,11 +2654,8 @@ impl Compiler {
}

let mut loop_labels = vec![];
let mut is_async = false;
for generator in generators {
if generator.is_async {
unimplemented!("async for comprehensions");
}

let loop_block = self.new_block();
let after_block = self.new_block();

Expand All @@ -2670,18 +2667,32 @@ impl Compiler {
self.compile_expression(&generator.iter)?;

// Get iterator / turn item into an iterator
emit!(self, Instruction::GetIter);
if generator.is_async {
emit!(self, Instruction::GetAIter);
} else {
emit!(self, Instruction::GetIter);
}
}

loop_labels.push((loop_block, after_block));

self.switch_to_block(loop_block);
emit!(
self,
Instruction::ForIter {
target: after_block,
}
);
if generator.is_async {
is_async = true;
emit!(self, Instruction::SetupFinally {
handler: after_block,
});
emit!(self, Instruction::GetANext);
self.emit_constant(ConstantData::None);
emit!(self, Instruction::YieldFrom);
emit!(self, Instruction::PopBlock);
} else {
emit!(
self,
Instruction::ForIter {
target: after_block,
}
);
}

self.compile_store(&generator.target)?;

Expand All @@ -2699,6 +2710,9 @@ impl Compiler {

// End of for loop:
self.switch_to_block(after_block);
if is_async {
emit!(self, Instruction::EndAsyncFor);
}
}

if return_none {
Expand Down Expand Up @@ -2735,10 +2749,19 @@ impl Compiler {
self.compile_expression(&generators[0].iter)?;

// Get iterator / turn item into an iterator
emit!(self, Instruction::GetIter);
if is_async {
emit!(self, Instruction::GetAIter);
} else {
emit!(self, Instruction::GetIter);
};

// Call just created <listcomp> function:
emit!(self, Instruction::CallFunctionPositional { nargs: 1 });
if is_async {
emit!(self, Instruction::GetAwaitable);
self.emit_constant(ConstantData::None);
emit!(self, Instruction::YieldFrom);
}
Ok(())
}

Expand Down
2 changes: 1 addition & 1 deletion compiler/core/src/bytecode.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1268,7 +1268,7 @@ impl Instruction {
}
GetAIter => 0,
GetANext => 1,
EndAsyncFor => -2,
EndAsyncFor => -1,
ExtendedArg => 0,
}
}
Expand Down
1 change: 0 additions & 1 deletion vm/src/frame.rs
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Expand Up @@ -1000,7 +1000,6 @@ impl ExecutingFrame<'_> {
}
bytecode::Instruction::EndAsyncFor => {
let exc = self.pop_value();
self.pop_value(); // async iterator we were calling __anext__ on
if exc.fast_isinstance(vm.ctx.exceptions.stop_async_iteration) {
vm.take_exception().expect("Should have exception in stack");
Ok(None)
Expand Down