| Commit message (Collapse) | Author | Age | Files | Lines |
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Anytime we create a slice, the first check tends to be whether it's empty.
If we handle ill-formed slices here where start > end, that provides a
measure of safety.
In the Mu translator (mu.subx) we often check for a trailing ':' or ','
and decrement slice->end to ignore it. But that could conceivably yield
ill-formed slices if the slice started out empty. Now we make sure we never
operate on such ill-formed slices.
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Layers 0-89 are used in self-hosting SubX.
Layers 90-99 are not needed for self-hosting SubX, and therefore could
use transitional levels of syntax sugar.
Layers 100 and up use all SubX syntax sugar.
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Try to make the comments consistent with the type system we'll eventually
have.
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Fix a bug in one test: it checks eax when the component under test returns
nothing. It's been just accidentally passing all these months.
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Support binary operations with reg/mem and reg operands.
Everything is passing. However, the self-hosting translator now generates
some discrepancies compared to the C++ translator :(
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Replace calculations of constants with labels.
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Move stack operations to a layer of their own.
It was some short-term pain to take out the syntax sugar from it, but we
need access to this layer from braces, which can't depend on sugar since
it's part of sugar. Just simpler to keep one clear line and not have to
build sometimes with some sugar but not others.
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This undoes 5672 in favor of a new plan:
Layers 000 - 099 are for running without syntax sugar. We use them for
building syntax-sugar passes.
Layers 100 and up are for running with all syntax sugar.
The layers are arranged in approximate order so more phases rely on earlier
layers than later ones.
I plan to not use intermediate syntax sugar (just sigils without calls,
or sigils and calls without braces) anywhere except in the specific passes
implementing them.
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Right now we always build the library before any apps.
Apps are where our syntax sugar translators (sigils, calls, braces) live.
So we can't use sugar in the standard library.
New idea: move all code for SubX phases into the top-level.
Perhaps we should also just build a single file rather than pipeline stages.
But for now we'll build each phase by building up to some specific layer.
This will simplify test_apps and move lots of one-off logic to a more standard
form in test_layers.
I'm also going to reorg existing layers so that we introduce each phase
at a point where it mostly only gets the helpers it needs.
This commit itself is just cleaning up some common strings. Using explicit
names for them streamlines binaries a bit.
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skip {whitespace, non-whitespace} x {from stream, from slice}
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Probably not needed for desugar; I'm just working through what we may
replace the calls to 'get-slice' with if and when we decide to start
focusing error messages and so writing tests for them.
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