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Now that we have the infrastructure for emitting cleanup blocks, the labeled
variants should be easy as well.
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Start pushing dummy vars for labels on the stack as we encounter them.
This won't affect cleanup code, but will make it easy to ensure that jumps
are well-structured.
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Clean up data structures and eliminate the notion of named blocks.
Named blocks still exist in the Mu language. But they get parsed into a
uniform block data structure, same as unamed blocks.
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Standardize on a single block name. This simplifies some code and will
also help in the next couple of steps.
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This will come in handy for the remaining cases where we need to clean
up locals on the stack:
loop after var
non-local break with vars in intervening blocks
non-local loop with vars in intervening blocks
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Before:
we detected labels using a '$' at the start of an arg, and turned them
into literals.
After:
we put labels on the var stack and let the regular lookup of the var
stack handle labels.
This adds complexity in one place and removes it from another. The crucial
benefit is that it allows us to store a block depth for each label. That
will come in handy later.
All this works only because of a salubrious coincidence: Mu labels are
always at the start of a block, and jumps always refer to the name at the
start of a block, even when the jump is in the forwards direction. So we
never see label uses before definitions.
Note on CI: this currently only works natively, not emulated.
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Momentarily less efficient, but we will soon need the ability to emit cleanup
code without losing all our state.
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Continuing to think about how to translate vars in a block when they're
followed by early exits. To clean up everything between a statement and
a target label, we need to know somehow the depth the target is defined
at.
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So far we only handle unlabeled break instructions correctly. That part
is elegance itself. But the rest will need more work:
a) For labeled breaks we need to insert code to unwind all intervening
blocks.
b) For unlabeled loops we need to insert code to unwind the current block
and then loop.
c) For labeled loops we need to insert code to unwind all intervening blocks
and then loop.
Is this even worth doing? I think so. It's pretty common for a conditional
block inside a loop to 'continue'. That requires looping to somewhere non-local.
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This is easy now that we're tracking block depths everywhere.
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For supporting branches with a target.
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This was too easy. But there are dragons ahead.
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Expand some buffer sizes to continue building mu.subx natively.
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