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Express prelude using Carbon syntax (#955)

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This should be clearer, more maintainable, and more scalable than building the prelude AST by hand.
This commit is contained in:
Geoff Romer
2021-11-29 13:56:55 -08:00
committed by GitHub
parent b14c97d0d7
commit 3e188c8562
9 changed files with 106 additions and 38 deletions
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executable_semantics/interpreter/interpreter.cpp
+11 -8
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@@ -594,19 +594,22 @@ void Interpreter::StepExp() {
} else {
FATAL() << "in handle_value with Call pos " << act.pos();
}
case ExpressionKind::IntrinsicExpression:
CHECK(act.pos() == 0);
case ExpressionKind::IntrinsicExpression: {
const auto& intrinsic = cast<IntrinsicExpression>(exp);
if (act.pos() == 0) {
return todo_.Spawn(
std::make_unique<ExpressionAction>(&intrinsic.args()));
}
// { {n :: C, E, F} :: S, H} -> { {n' :: C, E, F} :: S, H}
switch (cast<IntrinsicExpression>(exp).intrinsic()) {
case IntrinsicExpression::Intrinsic::Print:
Address pointer = GetFromEnv(exp.source_loc(), "format_str");
Nonnull<const Value*> pointee = heap_.Read(pointer, exp.source_loc());
CHECK(pointee->kind() == Value::Kind::StringValue);
case IntrinsicExpression::Intrinsic::Print: {
const auto& args = cast<TupleValue>(*act.results()[0]);
// TODO: This could eventually use something like llvm::formatv.
llvm::outs() << cast<StringValue>(*pointee).value();
llvm::outs() << cast<StringValue>(*args.elements()[0]).value();
return todo_.FinishAction(TupleValue::Empty());
}
}
}
case ExpressionKind::IntTypeLiteral: {
CHECK(act.pos() == 0);
return todo_.FinishAction(arena_->New<IntType>());