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The testsuite output now contains diagnostic codes, so many tests need
to be updated at once.
We decided it was best to keep the diagnostic codes in the testsuite
output, so that contributors don't inadvertently make changes to the
diagnostic codes.
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Now the message explains why closed variables are not closed when
encountered in the body of (static ...).
This required adding to the local environment the free variables of
the local bindings in scope. Thus we can analyze and explain why a
variable is not closed when encountered.
Test Plan: ./validate
Reviewers: austin, simonpj, bgamari
Reviewed By: bgamari
Subscribers: mboes, thomie
Differential Revision: https://phabricator.haskell.org/D2167
GHC Trac Issues: #12003
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Summary:
With this patch closed variables are allowed regardless of whether
they are bound at the top level or not.
The FloatOut pass is always performed. When optimizations are
disabled, only expressions that go to the top level are floated.
Thus, the applications of the StaticPtr data constructor are always
floated.
The CoreTidy pass makes sure the floated applications appear in the
symbol table of object files. It also collects the floated bindings
and inserts them in the static pointer table.
The renamer does not check anymore if free variables appearing in the
static form are top-level. Instead, the typechecker looks at the
tct_closed flag to decide if the free variables are closed.
The linter checks that applications of StaticPtr only occur at the
top of top-level bindings after the FloatOut pass.
The field spInfoName of StaticPtrInfo has been removed. It used to
contain the name of the top-level binding that contains the StaticPtr
application. However, this information is no longer available when the
StaticPtr is constructed, as the binding name is determined now by the
FloatOut pass.
Test Plan: ./validate
Reviewers: goldfire, simonpj, austin, hvr, bgamari
Reviewed By: simonpj
Subscribers: thomie, mpickering, mboes
Differential Revision: https://phabricator.haskell.org/D2104
GHC Trac Issues: #11656
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Summary:
As proposed in [1], this extension introduces a new syntactic form
`static e`, where `e :: a` can be any closed expression. The static form
produces a value of type `StaticPtr a`, which works as a reference that
programs can "dereference" to get the value of `e` back. References are
like `Ptr`s, except that they are stable across invocations of a
program.
The relevant wiki pages are [2, 3], which describe the motivation/ideas
and implementation plan respectively.
[1] Jeff Epstein, Andrew P. Black, and Simon Peyton-Jones. Towards
Haskell in the cloud. SIGPLAN Not., 46(12):118–129, September 2011. ISSN
0362-1340.
[2] https://ghc.haskell.org/trac/ghc/wiki/StaticPointers
[3] https://ghc.haskell.org/trac/ghc/wiki/StaticPointers/ImplementationPlan
Authored-by: Facundo Domínguez <facundo.dominguez@tweag.io>
Authored-by: Mathieu Boespflug <m@tweag.io>
Authored-by: Alexander Vershilov <alexander.vershilov@tweag.io>
Test Plan: `./validate`
Reviewers: hvr, simonmar, simonpj, austin
Reviewed By: simonpj, austin
Subscribers: qnikst, bgamari, mboes, carter, thomie, goldfire
Differential Revision: https://phabricator.haskell.org/D550
GHC Trac Issues: #7015
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