This provides much more clarity as to what is going on. Further, it's less
ambiguous, since I'm about to introduce a new type of xmlo lowering into XIR
for writing the actual xmlo files.
DEV-7145
This allows `XmlXirReader` to be used in a `Lower` operation, just as
everything else, bringing me one step closer to a pipeline that can be
concisely represented; this is finally beginning to unify in a clear way,
though it is still a bit of a mess.
This causes `XmlXirReader` to _act_ like a `parse::Parser` in that it yields
a `ParsedResult`, but it does not use `parse::Parser` itself; that was the
_original_ plan: convert it into a `ParseState` where `XmlXirReader` became
a context, and force `Parser` to yield by feeding it a stream of tokens with
`repeat`, but that ended up performing poorly relative to this change. I
did some investigation, which I might write about in the future, but for
now, this solution works just fine.
DEV-7145
This abstraction has grown quite a bit, and it's time to start formalizing
it a bit. This split doesn't change any behavior, but it does start to make
it easier to reason about by clearly stating the broad components and how
they interact with one-another.
This doesn't yet move the tests; those will come next, but they are very
few. The reason I gave previously for this was because (a) they're tested
indirectly via the systems that utilize them and (b) because the abstraction
was not yet settled on the process was already very expensive. No test
coverage was lost---it's only that failures were potentially harder to debug
on test failures, but in practice not even this was true, because the deeply
expressive types all but ensured that, if it compiles, it will function in a
way that is expected. Unit tests and documentation for this system will be
added once I'm sure that this abstraction is in a proper state.
DEV-7145
This also modifies `poc` such that `Lower` is invoked as an associated
function rather than a method to emphasize the pattern that is forming, so
that it can be later abstracted away.
DEV-11864
The `while_ok` can just be implied with a lowering operation, and that
reduces the name complexity so that we can maybe introduce even more
specialized methods without resulting in a huge sentence as a name.
DEV-11864
This finally uses `parse` all the way up to aggregation into the ASG, as can
be seen by the mess in `poc`. This will be further simplified---I just need
to get this committed so that I can mentally get it off my plate. I've been
separating this commit into smaller commits, but there's a point where it's
just not worth the effort anymore. I don't like making large changes such
as this one.
There is still work to do here. First, it's worth re-mentioning that
`poc` means "proof-of-concept", and represents things that still need a
proper home/abstraction.
Secondly, `poc` is retrieving the context of two parsers---`LowerContext`
and `Asg`. The latter is desirable, since it's the final aggregation point,
but the former needs to be eliminated; in particular, packages need to be
worked into the ASG so that `found` can be removed.
Recursively loading `xmlo` files still happens in `poc`, but the compiler
will need this as well. Once packages are on the ASG, along with their
state, that responsibility can be generalized as well.
That will then simplify lowering even further, to the point where hopefully
everything has the same shape (once final aggregation has an abstraction),
after which we can then create a final abstraction to concisely stitch
everything together. Right now, Rust isn't able to infer `S` for
`Lower<S, LS>`, which is unfortunate, but we'll be able to help it along
with a more explicit abstraction.
DEV-11864
This is present on all other packages. Rather than complicating TAMER to
accommodate a missing name, it's trivial to just add it.
This will, unfortunately, invalidate and require rebuilding of all xmlo
files, based on the `.rev-xmlo` bump.
DEV-11864
This is intended to describe, to the user, the state that the parser is
in. This will be used to convey additional information for general parser
errors, but it should also probably be integrated into parsers' individual
errors as well when appropriate.
This is something I expected to add at some point, but I wanted to add them
because, when dealing with lowering errors, it can be difficult to tell
what parser the error originated from.
DEV-11864
The `*_iter_while_ok` functions now compose like monads, flattening `Result`
at each step and drastically simplifying handling of error types. This also
removes the bunch of `?`s at the end of the expression, and allows me to use
`?` within the callback itself.
I had originally not used `Result` as the return type of the callback
because I was not entirely sure how I was going to use them, but it's now
clear that I _always_ use `Result` as the return type, and so there's no use
in trying to be too accommodating; it can always change in the future.
This is desirable not just for cleanup, but because trying to refactor
`asg_builder` into a pair of `Parser`s is really messy to chain without
flattening, especially given some state that has to leak temporarily to the
caller. More on that in a future commit.
DEV-11864
This was always the intent, but I didn't have a higher-level object
yet. This removes all the awkwardness that existed with working the root
in as an identifier.
DEV-11864
This wraps `Ident` in a new `Object` variant and modifies `Asg` so that its
nodes are of type `Object`.
This unfortunately requires runtime type checking. Whether or not that's
worth alleviating in the future depends on a lot of different things, since
it'll require my own graph implementation, and I have to focus on other
things right now. Maybe it'll be worth it in the future.
Note that this also gets rid of some doc examples that simply aren't worth
maintaining as the API evolves.
DEV-11864
A previous commit mentioned that there's not a place for `Dim`, and
duplicated it between `asg` and `xmlo`. Well, `Dtype` is also needed in
both, and so here's a home for now.
`Dtype` has always been an inappropriate detail for the system and will one
day be removed entirely in favor of higher-level types; the machine
representation is up to the compiler to decide.
DEV-11864
asg_builder is about to be replaced, but in the process of simplifying the
destination IR (the ASG), I'm moving things into the proper place. This
never belonged here---it belongs with the actual lowering operation.
Previously, this was not reasoned about in terms of a lowering operation,
and was written when I was first introducing myself to Rust and trying to
get a proof-of-concept linker working.
DEV-11864
This matches xmlo::Dim, and could be the same thing, if we can find a home
for it in the future; it's not worth creating such a home right now when I'm
not yet sure what else ought to live there; the duplication may be fine.
The conversion from xmlo needs to be moved, and `Dim` is going to be used
for more than just identifiers (expressions will have type inference
performed).
DEV-11864
This allows retrieving and providing a context to a `Parser`. This is
intended for use with an aggregating parser, in particular to construct the
ASG and return it.
This is a component of a change that replaces `asg_builder` with a
`Parser`-based lowering into the ASG, but there are still changes that need
to be made to simplify things and complete its integration.
DEV-11864
Previously, since the graph contained only identifiers, discovered roots
were stored in a separate vector and exposed to the caller. This not only
leaked details, but added complexity; this was left over from the
refactoring of the proof-of-concept linker some time ago.
This moves the root management into the ASG itself, mostly, with one item
being left over for now in the asg_builder (eligibility classifications).
There are two roots that were added automatically:
- __yield
- __worksheet
The former has been removed and is now expected to be explicitly mapped in
the return map, which is now enforced with an extern in `core/base`. This
is still special, in the sense that it is explicitly referenced by the
generated code, but there's nothing inherently special about it and I'll
continue to generalize it into oblivion in the future, such that the final
yield is just a convention.
`__worksheet` is the only symbol of type `IdentKind::Worksheet`, and so that
was generalized just as the meta and map entries were.
The goal in the future will be to have this more under the control of the
source language, and to consolodate individual roots under packages, so that
the _actual_ roots are few.
As far as the actual ASG goes: this introduces a single root node that is
used as the sole reference for reachability analysis and topological
sorting. The edges of that root node replace the vector that was removed.
DEV-11864
Rather than having the linker add this symbol opaquely, let's remove the
special case and generalize it. There's nothing special about yield, except
historical precedent.
Systems can explicitly add it as a root in a common return map.
DEV-11864
In the actual implementation (outside of tests), this is always looking up
before adding the symbol. This will simplify the API, while still retaining
errors, since the identifier will fail the state transition if the
identifier did not exist before attempting to set a fragment. So while this
is slower in microbenchmarks, this has no effect on real-world performance.
Further, I'm refactoring toward a streaming ASG aggregation, which is a lot
easier if we do not need to perform lookups in a separate step from the
ASG's primitives.
DEV-11864
`PartialEq` remains, and is all that is needed. See previous commit
regarding the removal of this same bound from `Context`.
This can be re-added if it ends up actually being necessary. But Tokens are
ephemeral and used only in lowering pipelines, using pattern matching.
DEV-11864
These traits are no longer necessary now that I'm using concrete types; they
just add unnecessary noise and confusion as I attempt to further refactor.
Don't abstract prematurely.
DEV-11864
This removes the generic on the Asg (which was formerly BaseAsg),
hard-coding `IdentObject`, which will further evolve. This makes the IR an
actual concrete IR rather than an abstract data structure.
These tests bring me back a bit, since they were written as I was still
becoming familiar with Rust.
DEV-11864
This is the beginning of an incremental refactoring to remove generics, to
simplify the ASG. When I initially wrote the linker, I wasn't sure what
direction I was going in, but I was also negatively influenced by more
traditional approaches to both design and unit testing.
If we're going to call the ASG an IR, then it needs to be one---if the core
of the IR is generic, then it's more like an abstract data structure than
anything. We can abstract around the IR to slice it up into components that
are a little easier to reason about and understand how responsibilities are
segregated.
DEV-11864
This is unnecessarily restrictive, since we do not require anything further
than `PartialEq` for the situations where we care about equality (tests).
DEV-11864
This is too restrictive, especially for parsers that fold into something,
like the ASG, which may exist prior to invoking the parser.
This moves the trait bound to the functions that actually need it. Those
obviously cannot be used if the Context does not implement `Default`, but
I'll provide alternative conveniences.
DEV-11864
I attempted to resolve an error previously, and I thought I had, but
apparently some symbols acquire a @dtype at some point in the process, or
lose it. Regardless, I have no interest in debugging or resolving this
mess, since it's going away.
The linker ensures that externs match, so while this could potentially allow
conflicting imports within a package (unlikely, given that extern templates
are recommended), it still will not resolve with a conflicting concrete
implementation. I'm not worried.
DEV-1036
Extern resolution has apparently been failing for quite some time, resulting
in `preproc:error` nodes in the _symbol table_ of return maps. This was
caught by the new xmlo parser, which does not ignore nodes it does not care
about.
The failure was caused by missing `@dtype`---the externs did in fact match,
and if they did not, then the linker would have failed.
This doesn't modify the map compiler to properly detect these, because
this compiler is going away in the hopefully-near future, and the problems
will now be caught, though in a very unideal way (as a parse error during
xmlo reading).
DEV-10936
preproc:sym/preproc:from is used for generating `knownFields` using the
_input_ map, so this has no use for return map values; the map still
produces edges to its dependencies.
The issue is that there are return map entries in some of our systems that
are producing multiple `preproc:from`, but I somewhat-recently modified the
system to support only a single map, to remove dynamic allocation. This
resolves that problem.
With that said, `knownFields` was created for Liza to know when the
classifier ought to be invoked, to save time. Back when it was first
introduced ~10y ago, this provided significant savings, however the
structure of our system now is such that nearly every single field invokes
the classifier.
Furthermore, these details should remain encapsulated; if we wanted to make
that determination, we should be provided with a delta, which we could also
use to do incremental classification in the future, if there's an ROI there
after other improvements have been made.
So, eventually, preproc:sym/preproc:from will go away entirely.
DEV-10936
RSG (Ryan Specialty Group) recently announced a rename to Ryan Specialty (no
"Group"), but I'm not sure if the legal name has been changed yet or not, so
I'll wait on that.
These are no longer TODOs---they represent invalid tokens.
I'm going to put effort into providing further context with the diagnostic
system [right now] because these are internal errors caused by either
miscompilation or an incomplete reader.
DEV-10936
The new xmlo parser was failing on a worksheet xmlo file because fragments
were not properly placed within the header.
This was a change made when tameld was introduced so that we could stop
reading xmlo files early.
DEV-10936
This was missed when removing it from other Display impls when the new
diagnostic system was introduced. Raw `Span`s display byte offsets and the
context, which is no longer desirable as part of an error message.
DEV-10936
TAMER rejects this, because we shouldn't be using anything but UTF-8. My
use of this encoding is ancient, from over a decade ago, that was apparently
just copied around.
DEV-10936
I had waited to provide more documentation until I was sure that the
abstraction was not going to change significantly; there was a lot of
refactoring in prior commits.
DEV-12151
This moves construction out of `From` and into separate associated
functions, which can be further simplified in a bit.
We also need unit tests for this, since this still relies on integration
tests due to the cost of the aggressive and tight refactoring iterations.
DEV-12151
Previously, when adjacent duplicate spans were both resolved, if one failed,
the other certainly would, which would result in duplicate labels each
squash. Elided spans do not have syslabels, and so this is no longer a
concern.
DEV-12151
Mike Gerwitz