tame/RELEASES.md

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TAME Release Notes
==================
This file contains notes for each release of TAME since v17.4.0.
TAME uses [semantic versioning][]. Any major version number increment
indicates that backwards-incompatible changes have been introduced in that
version. Each such version will be accompanied by notes that provide a
migration path to resolve incompatibilities.
[semantic versioning]: https://semver.org/
TAME developers: Add new changes under a "NEXT" heading as part of the
commits that introduce the changes. To make a new release, run
`tools/mkrelease`, which will handle updating the heading for you.
NEXT
====
This is a documentation/design release, introducing The TAME Programming
Language in `design/tpl`.
Design
------
- Introduce The TAME Programming Language.
v17.8.1 (2021-03-18)
====================
This release contains a bufix for recent build changes in v17.8.0 that were
causing, under some circumstances, builds to fail during dependency
generation. It also contains minor improvements and cleanup.
Build System
------------
- [bugfix] Lookup tables will no longer build `rater/core/vector/table` when
geneating the `xml` package.
- This was causing problems during `suppliers.mk` dependency generation.
The dependency is still in place for the corresponding `xmlo` file.
- This was broken by v17.8.0.
- Minor improvements to `tame` and `tamed` scripts to ensure that certain
unlikely failures are not ignored.
v17.8.0 (2021-02-23)
====================
This release contains changes to the build system to accommodate
liza-proguic's introduction of step-based packages (in place of a monolithic
`package-dfns.xml`), as well as miscellaneous improvements.
Compiler
--------
- `rater.xsd`, used for certain validations of TAME's grammar, has been
updated to an out-of-tree version; it had inadvertently gotten out of
date, and the discrepency won't happen again in the future.
- Further, limits on the length of `@yields` identifiers have been
removed; the lack of namespacing and generation of identifiers from
templates can yield longer identifier names.
Build System
------------
- Only modify `.version.xml` timestamp when hash changes. This allows
its use as a dependency without forcefully rebuilding each and every time.
- `configure` will no longer immediately generate `suppliers.mk`.
- Additionally, `build-aux/suppmk-gen`, which `configure` directly invoked
until now, was removed in favor of generic rules in `Makefile.am`.
- Step-level imports in program definitions are now recognized to
accommodate liza-proguic's step-level package generation.
- Step-level program packages are now properly accounted for as dependencies
for builds.
- `supplier.mk` is now automatically regenerated when source files
change. This previously needed to be done manually when imports changed.
- `supplier.mk` generation will no longer be verbose (it'll instead be
only one line), which makes it more amenable to more frequent
regeneration.
v17.7.0 (2020-12-09)
====================
This release provides tail-call optimizations aimed at the query system in
core.
Compiler
--------
- [bugfix] Recursive calls using TCO will wait to overwrite their function
arguments until all expressions calculating the new argument values have
completed.
`tame-core`
-----------
- `mrange` is now fully tail-recursive and has experimental TCO applied.
- It was previously only recursive for non-matching rows.
v17.6.5 (2020-12-03)
====================
This release improves Summary Page performance when populating the page with
data loaded from an external source.
Summary Page
------------
- Populating the DOM with loaded data now runs in linear time.
v17.6.4 (2020-11-23)
====================
This release tolerates invalid map inputs in certain circumstances.
Compiler
--------
- Tolerate non-string inputs to `uppercase` and `hash` map methods.
v17.6.3 (2020-11-03)
====================
- Update the CDN used to get MathJax.
v17.6.2 (2020-10-01)
====================
- Optionally include a "program.mk" file if it is present in the project's root
directory. This allows us to move program specific tasks outside of TAME.
v17.6.1 (2020-09-23)
====================
Compiler
--------
- `lv:param-class-to-yields` will now trigger a failure rather than relying
on propagating bad values, which may not result in failure if the symbol
is represented by another type (non-class) of object.
Miscellaneous
-------------
- `package-lock.json` additions.
v17.6.0 (2020-08-19)
====================
This release provides a new environment variable for JVM tuning. It does
not provide any new compiler features or performance enhancements in itself,
though it enables optimizations through JVM tuning.
Compiler
--------
- The new environment variable `TAMED_JAVA_OPTS` can now be used to provide
arguments to the JVM. This feature was added to support heap ratio
tuning.
Miscellaneous
-------------
- `build-aux/lsimports` was causing Gawk to complain about the third
argument to `gensub`; fixed.
- `bootstrap` will test explicitly whether `hoxsl` is a symbol link, since
`-e` fails if the symlink is broken.
v17.5.0 (2020-07-15)
====================
This release adds support for experimental human-guided tail call
optimizations (TCO) to resolve issues of stack exhaustion during runtime for
tables with a large number of rows after having applied the first
predicate. This feature should not be used outside of `tame-core`, and will
be done automatically by TAMER in the future.
`tame-core`
-----------
- `vector/filter/mrange`, used by the table lookup system, has had its
mutually recursive function inlined and now uses TCO.
- This was the source of stack exhaustion on tables whose predicates were
unable to filter rows sufficiently.
Compiler
--------
- Experimental guided tail call optimizations (TCO) added to XSLT-based
compiler, allowing a human to manually indicate recursive calls in tail
position.
- This is undocumented and should only be used by `tame-core`. The
experimental warning will be removed in future releases if the behavior
proves to be sound.
- TAMER will add support for proper tail calls that will be detected
automatically.
v17.4.3 (2020-07-02)
====================
This release fixes a bug caused by previous refactoring that caused
unresolved externs to produce an obscure and useless error for the end
user.
Linker
------
- Provide useful error for unresolved identifiers.
- This was previously falling through to an `unreachable!` block,
producing a very opaque and useless internal error message.
v17.4.2 (2020-05-13)
====================
This release adds GraphML output for linked objects to allow us to
inspect the graph.
Linker
------
- Add `--emit` oprion to `tamer/src/bin/tameld.rs` that allows us to specify
the type of output we want.
- Minor refactoring.
Miscellaneous
-------------
- Added `make` target to build linked GraphML files.
- Updated `make *.xmle` target to explicitly state it is emitting `xmle`.
- Added Cypher script to use in Neo4J after a GraphML file is imported.
- `RELEASES.md`
- Add missing link to semver.org.
- Fix `tame-core` heading, which was erroneously Org-mode-styled.
- Rephrase and correct formatting of an introduction paragraph.
v17.4.1 (2020-04-29)
====================
This release refactors the linker, adds additional tests, and improves
errors slightly. There are otherwise no functional changes.
Compiler
--------
- Refactor proof-of-concept dependency graph construction code.
- Improvements to error abstraction which will later aid in reporting.
Miscellaneous
-------------
- `RELEASES.md` added.
- `tools/mkrelease` added to help automate updating `RELEASES.md`.
- `build-aux/release-check` added to check releases.
- This is invoked both by `tools/mkrelease` and by CI via
`.gitlab-ci.yml` on tags.
v17.4.0 (2020-04-17)
====================
This release focuses on moving some code out of the existing XSLT-based
compiler so that the functionality does not need to be re-implemented in
TAMER. There are no user-facing changes aside form the introduction of two
new templates, which are not yet expected to be used directly.
`tame-core`
-----------
- New `rate-each` template to replace XSLT template in compiler.
- New `yields` template to replace XSLT template in compiler.
- Users should continue to use `rate-each` and `yields` as before rather
than invoking the new templates directly.
- The intent is to remove the `t` namespace prefix in the future so that
templates will be applied automatically.
Compiler
--------
- XSLT-based compiler now emits `t:rate-each` in place of the previous XSLT
template.
- XSLT-based compiler now emits `t:yields` in place of the previous XSLT
template.