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* 7524 - bring back some abort messagesKartik Agaram2021-01-151-1/+8
| | | | | | | | | | | Our infrastructure for displaying errors is far more rudimentary in baremetal. Many ways things can go wrong. But making the attempt seems better than not. I'm also making some effort to keep it easy to see what has been copied over from the top-level, by not modifying copied code to use syntax sugar and so on. It may not be an important enough reason to mix notations in a single file.
* 7523Kartik Agaram2021-01-151-0/+5
| | | | | | | | | | | | | | | | | | | | There's a dependency cycle here: - draw-grapheme (Mu) uses read-grapheme (Mu) to be unicode-aware. - read-grapheme uses read-byte (SubX). Streams are a fundamental data structure in Mu. For the Mu compiler to be able to reason about the safety of stream operations, they need to be an opaque type. All stream primitives are written in SubX. To manipulate a stream's internals we force people to reach for SubX. That way if there's no SubX code there's confidence that things are safe. - read-byte and other stream operations have unit tests, like they should. The unit tests need to print data to screen when say a test fails. To do this they use various check- functions (SubX) that take a string argument. - Printing a string to screen uses draw-grapheme (Mu). Perhaps I should maintain variants of drawing primitives that operate only on ASCII.
* 7522 - bring back a few tests in .subx filesKartik Agaram2021-01-151-0/+30
| | | | | | | | Even though baremetal has tests in SubX, they can only run in Mu programs since the test harness is currently in a Mu layer. Baremetal isn't really intended for running SubX programs at the moment. Is this a step down the slippery slope towards C compilers that I complained about in http://akkartik.name/akkartik-convivial-20200607.pdf?
* 7518Kartik Agaram2021-01-131-0/+1
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* 7492Kartik Agaram2021-01-091-0/+37
Port some support for unicode to baremetal.