| Commit message (Collapse) | Author | Age | Files | Lines |
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Now all known discrepancies between C++ and SubX translators are fixed.
If a SubX program builds with C++, it should also build fine with just
SubX.
(If it doesn't build with C++, all bets are off. The self-hosted SubX
translator has negligible error-detection or handling.)
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This makes the C++ translator more consistent with the self-hosted
translator.
We go through some contortions to continue supporting unit tests without
'Entry' labels. But we still want to throw good errors when translating
.subx files at the commandline.
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I've extracted it into a separate binary, independent of my Mu prototype.
I also cleaned up my tracing layer to be a little nicer. Major improvements:
- Realized that incremental tracing really ought to be the default.
And to minimize printing traces to screen.
- Finally figured out how to combine layers and call stack frames in a
single dimension of depth. The answer: optimize for the experience of
`browse_trace`. Instructions occupy a range of depths based on their call
stack frame, and minor details of an instruction lie one level deeper
in each case.
Other than that, I spent some time adjusting levels everywhere to make
`browse_trace` useful.
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Considering how much trouble a merge phase would be (commit 4978), it seems
simpler to just add the extra syntax for controlling the entry point of
the generated ELF binary.
But I wouldn't have noticed this if I hadn't taken the time to write out
the commit messages of 4976 and 4978.
Even if we happened to already have linked list primitives built, this
may still be a good idea considering that I'm saving quite a lot of code
in duplicated entrypoints.
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Bugfix: I forgot about ELF segment offsets when implementing VMAs. Eventually
segments grew large enough that I started seeing overlaps.
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A debugging aid: 'subx --map translate' dumps a mapping from functions
to addresses to a file called "map", and 'subx --map run' loads the mapping
in "map", augmenting debug traces.
Let's see how much this helps. Debugging machine code has been pretty painful
lately.
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Make segment management a little more consistent between initial segments
and add-on segments (using `mmap`).
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Start requiring a '-o' flag to designate the output binary when translating.
Things currently get funky if you pass in multiple inputs, but that's ok.
This is the first step to supporting multiple input files for a single
output binary.
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Running reset() doesn't seem necessary so far for the translate sub-command,
but it's likely to expose us to weird bugs.
Immediately, it requires toggling `Dump_trace` in different places to print
traces while translating vs while running.
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Make segment names a separate transform.
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