| Commit message (Collapse) | Author | Age | Files | Lines |
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$ ./translate_subx init.linux 0*.subx && ./a.elf test
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Some minor tweaks while preparing presentation to Mek's Junto group.
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Rip out scaffolding for function overloading.
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This bug was never caught because we've never tested with more than 2 segments.
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Why the heck are we bumping this pointer? Seems like a bug.
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So far it's unclear how to do this in a series of small commits. Still
nibbling around the edges. In this commit we standardize some terminology:
The length of an array or stream is denominated in the high-level elements.
The _size_ is denominated in bytes.
The thing we encode into the type is always the size, not the length.
There's still an open question of what to do about the Mu `length` operator.
I'd like to modify it to provide the length. Currently it provides the
size. If I can't fix that I'll rename it.
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It's going to be hard work retrofitting 8-byte handles in place of 4-byte
addrs. Here we just clean up some unused args.
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At the lowest level, SubX without syntax sugar uses names without prepositions.
For example, 01 and 03 are both called 'add', irrespective of source and
destination operand. Horizontal space is at a premium, and we rely on the
comments at the end of each line to fully describe what is happening.
Above that, however, we standardize on a slightly different naming convention
across:
a) SubX with syntax sugar,
b) Mu, and
c) the SubX code that the Mu compiler emits.
Conventions, in brief:
- by default, the source is on the left and destination on the right.
e.g. add %eax, 1/r32/ecx ("add eax to ecx")
- prepositions reverse the direction.
e.g. add-to %eax, 1/r32/ecx ("add ecx to eax")
subtract-from %eax, 1/r32/ecx ("subtract ecx from eax")
- by default, comparisons are left to right while 'compare<-' reverses.
Before, I was sometimes swapping args to make the operation more obvious,
but that would complicate the code-generation of the Mu compiler, and it's
nice to be able to read the output of the compiler just like hand-written
code.
One place where SubX differs from Mu: copy opcodes are called '<-' and
'->'. Hopefully that fits with the spirit of Mu rather than the letter
of the 'copy' and 'copy-to' instructions.
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At the SubX level we have to put up with null-terminated kernel strings
for commandline args. But so far we haven't done much with them. Rather
than try to support them we'll just convert them transparently to standard
length-prefixed strings.
In the process I realized that it's not quite right to treat the combination
of argc and argv as an array of kernel strings. Argc counts the number
of elements, whereas the length of an array is usually denominated in bytes.
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I had to amend commit 6148 three times yesterday as I kept finding bugs
by inspection. And yet I stubbornly thought I didn't need a test.
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This is quite inefficient; don't use it for very large objects.
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This could be a can of worms, but I think I have a set of checks that will
keep use of addresses type-safe.
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