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https://github.com/Mercury-Language/mercury.git
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8ab130a3b0
Estimated hours taken: 500
Add a new pass to the compiler, that attempts to introduce accumulators
into a procedure so as to make that procedure tail recursive.
WORK_IN_PROGRESS:
Document that the transformation now exists.
compiler/goal_util.m:
Create goal_util__can_reorder_goals, which is a version of
pd_util__can_reorder_goals that will work on the alias branch.
compiler/instmap.m:
Add instmap__changed_vars. This predicate is meant to provide the
same functionality as instmap_delta_changed_vars, but work on the
alias branch.
Also add comment to instmap_delta_changed_vars about using
instmap_changed_vars
compiler/accumulator.m:
The transformation.
compiler/mercury_compile.m:
Call the transformation.
compiler/options.m:
Add the option to turn the transformation on.
doc/user_guide.texi:
Document the option.
profiler/demangle.m:
util/mdemangle.c:
Demangle the accumulator version of the procedure labels.
compiler/notes/compiler_design.html:
Add the new pass to the documentation.
74 lines
2.7 KiB
Plaintext
74 lines
2.7 KiB
Plaintext
Work in progress
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----------------
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The compiler contains some code for the following features,
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which are not yet completed, but which we hope to complete
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at some time in the future:
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* Existential types.
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* Thread-safe engine.
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* Independent AND-parallelism.
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* We have added support for dynamic link libraries (DLLs) on Windows.
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This is not yet enabled by default because it has not yet been tested
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properly.
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* There is a new `--optimize-constructor-last-call' option
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which identifies opportunities for LCO where a call
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is followed only by some constructor invocations.
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However, these opportunities are not exploited yet.
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* We now allow programmers to give names to the arguments of constructor
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function symbols. (Disabled, due to lack of a suitable operator.)
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* There is a new garbage collector that does accurate garbage
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collection (.agc grade). It is currently limited to deterministic
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code, and needs a great deal of tuning and optimization. It also
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needs testing.
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* Mercury is now the official programming language for Melbourne Uni's
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"Aditi" deductive database system. The Mercury compiler includes
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support for interfacing to Aditi. However Aditi itself is not yet
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complete and has not yet been made publicly available.
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(The Aditi support is documented in doc/reference_manual.texi,
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but for now that documentation is commented out -- it's not
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included in the formatted versions of the reference manual,
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only in the TexInfo source code.)
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* Converting procedures to tail-recursive form via automatic
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accumulator introduction (--introduce-accumulators).
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* The Mercury debugger (mdb) now includes some support for declarative
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debugging.
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We also have some code that goes at least some part of the way towards
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implementing the features below. However, for these features, the
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code has not yet been committed and thus is not part of the standard
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distribution.
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* Support for aliasing in the mode system.
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Work not in progress
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--------------------
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The compiler also contains some code for the following features,
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but work on them has stopped, since finishing them off would be
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quite a bit more work, and our current priorities lie elsewhere.
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Still, these would make interesting and worthwhile projects
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if someone has the time for it.
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* There is a `--generate-bytecode' option, for a new back-end
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that generates bytecode. The bytecode generator is basically
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complete, but we don't have a bytecode interpreter.
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* There is a `--generate-prolog' option for a new back-end
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that generates Prolog code.
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Not very much progress has really been made on this.
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* There is a `--high-level-c' option, for a new back-end
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that generates C code but at a much higher level than the
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current back-end.
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