| Commit message (Collapse) | Author | Age | Files | Lines |
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We want slice-equal? for length-prefixed strings, not null-terminated "kernel"
strings.
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In the process of building slice primitives I found an out-of-bounds access
in write-byte.
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Fix CI.
a) Update canonical binaries.
b) Fix an out-of-bounds access in `clear-stream`. This also required supporting
a new instruction in `subx run` to load an imm8 into rm8.
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We only can't use rm32=5 when mod=0. Totally fine when it's mod=1.
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More mnemonic register usage in write-stream.
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Our first buffer overflow!
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Clean up a few things:
a) Call scan-next-byte in hex.subx with the right number of args. Turns
out tests continue to work fine if they never use the other args.
b) Tear down a test for 'stop' in the right order. Not important since we
have no EBP to restore. But can still be misleading.
c) Have 'check-ints-equal' return nothing. Handy for it to not mess up
EAX. I never use the result anyway, and the name also is imperative suggesting
callers won't expect a return value.
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New helper: print an error message, then a numeric byte, then abort.
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New helper: printing a string to a buffered file.
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Better to use EDI as a mnemonic for 'destination'.
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Let's standardize to use opcode 39 rather than 3b by default.
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Fix CI since 4827.
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This is likely a sub-optimal interface, but I'm trying not to agonize.
The whole point of Mu is to permit radical changes at any point in time.
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I was 'returning' a phantom value from 'write' when the underlying '_write'
returns nothing.
In general, returning counts of bytes written is not so useful for error
checking when my primitives abstract away from that. We'll come back to
error signalling later.
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Fix CI.
It's kind of a hassle (and wasteful) that I need to redefine 'main' in
every single layer.
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Start with an exactly corresponding version to Crenshaw 2-1: single-digit
numbers. The only change: we assume the number is in hex.
The next version now supports multi-digit hex numbers.
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Simplification.
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In the process I had to fix a couple more bugs in support for disp16 instructions.
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This time I've ported (and test-driven) 'GetChar' and 'GetNum'. The new
tests bring together our new testable interfaces for read() and exit().
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Long-standing and long-copied typo has been messing with our exit status
on test failures.
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Extract a helper that we'll need for 'read'.
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We'll use a common stream data structure for input and output streams.
Having separate types makes more sense in a more high-level language, where
we have type checking and where functions for handling the different types
are more concise. But in machine code the sweet spot is more toward fewer
types.
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Start injecting all dependencies in the Crenshaw compiler app.
In the process I realized the non-fake code path of 'stop' had a bug.
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Initial sketch of a dependency-injected wrapper around the exit() syscall.
I don't have the primitives yet, just a sketch of how they should work
-- and a passing test for non-local jumps without support for passing the
exit status to the caller.
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Extract a helper for appending strings to raw buffers.
I'd been resisting this idea, but it actually turns out to be a pretty
clean abstraction in the end.
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Start using write() instead of _write().. and we promptly find a typo when
dealing with real file descriptors.
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