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There are four components to this patch which make it possible to
implement `ghc-debug`.
1. Add four new functions to the RtsAPI.
* rts_pause and rts_unpause allow an external process to completely
pause and unpause the RTS.
* rts_listThreads and rts_listMiscRoots are used to find the current
roots of the garbage collector.
These changes also mean that `Task.h` is exposed to the user.
2. Generalise the `ghc-heap` API so that raw `Word`s can be returned
rather than actual objects. This is necessary when trying to decode
closures on an external process because the pointers in such closures
are correct for the internal rather than external process. If you used
the previous API then you would get a segfault as the garbage collector
would try to traverse into these nonsensical branches.
```
-- before
getClosureData :: a -> IO Closure
-- after
getClosureDataX :: (forall c . c -> IO (Ptr StgInfoTable, [Word], [b]))
-> a -> IO (GenClosure b)
```
For the normal case `b` is instantiated to `Box`, which contains a
pointer to a heap object.
```
data Box = Box a
-- GenClosure Box
```
For `ghc-debug` we instead just take the word of the address as we have
to explicitly interpret it on the external process.
```
GenClosure Word
```
3. Support for decoding `TSO` and `STACK` closures is partially
implemented. There is still quite a bit of work to do to finish both but
these at least allow us to make some more progress.
4. findPtr is generalised to take a callback argument. This means that
its result can be communicated to the debugger rather than just printing
out the result. The debugger has a function which invokes `findPtr` and
passes a callback which sends the result over a socket.
Co-authored-by: Ben Gamari <ben@smart-cactus.org>
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Throw an error if the user requests a flavour for which there is more
than one match.
Fixes #17156.
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Similar to SELinux, NetBSD "PaX mprotect" prohibits marking a page
mapping both writable and executable at the same time. Use libffi
which knows how to work around it.
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`DsMeta.rep_sig` used to skip over `FixSig` entirely, which had the
effect of causing local fixity declarations to be dropped when quoted
in Template Haskell. But there is no good reason for this state of
affairs, as the code in `DsMeta.repFixD` (which handles top-level
fixity declarations) handles local fixity declarations just fine.
This patch factors out the necessary parts of `repFixD` so that they
can be used in `rep_sig` as well.
There was one minor complication: the fixity signatures for class
methods in each `HsGroup` were stored both in `FixSig`s _and_ the
list of `LFixitySig`s for top-level fixity signatures, so I needed
to take action to prevent fixity signatures for class methods being
converted to `Dec`s twice. I tweaked `RnSource.add` to avoid putting
these fixity signatures in two places and added
`Note [Top-level fixity signatures in an HsGroup]` in `GHC.Hs.Decls`
to explain the new design.
Fixes #17608. Bumps the Haddock submodule.
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In https://gitlab.haskell.org/ghc/ghc/merge_requests/2192#note_246551
Simon convinced me that ignoring type variables existentially bound by
data constructors have to be the same way as value binders.
Sadly I couldn't think of a regression test, but I'm confident that this
change strictly improves on the status quo.
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We used to check `GrdVec`s arising from multiple clauses and guards in
isolation. That resulted in a split between `pmCheck` and
`pmCheckGuards`, the implementations of which were similar, but subtly
different in detail. Also the throttling mechanism described in
`Note [Countering exponential blowup]` ultimately got quite complicated
because it had to cater for both checking functions.
This patch realises that pattern match checking doesn't just consider
single guarded RHSs, but that it's always a whole set of clauses, each
of which can have multiple guarded RHSs in turn. We do so by
translating a list of `Match`es to a `GrdTree`:
```haskell
data GrdTree
= Rhs !RhsInfo
| Guard !PmGrd !GrdTree -- captures lef-to-right match semantics
| Sequence !GrdTree !GrdTree -- captures top-to-bottom match semantics
| Empty -- For -XEmptyCase, neutral element of Sequence
```
Then we have a function `checkGrdTree` that matches a given `GrdTree`
against an incoming set of values, represented by `Deltas`:
```haskell
checkGrdTree :: GrdTree -> Deltas -> CheckResult
...
```
Throttling is isolated to the `Sequence` case and becomes as easy as one
would expect: When the union of uncovered values becomes too big, just
return the original incoming `Deltas` instead (which is always a
superset of the union, thus a sound approximation).
The returned `CheckResult` contains two things:
1. The set of values that were not covered by any of the clauses, for
exhaustivity warnings.
2. The `AnnotatedTree` that enriches the syntactic structure of the
input program with divergence and inaccessibility information.
This is `AnnotatedTree`:
```haskell
data AnnotatedTree
= AccessibleRhs !RhsInfo
| InaccessibleRhs !RhsInfo
| MayDiverge !AnnotatedTree
| SequenceAnn !AnnotatedTree !AnnotatedTree
| EmptyAnn
```
Crucially, `MayDiverge` asserts that the tree may force diverging
values, so not all of its wrapped clauses can be redundant.
While the set of uncovered values can be used to generate the missing
equations for warning messages, redundant and proper inaccessible
equations can be extracted from `AnnotatedTree` by
`redundantAndInaccessibleRhss`.
For this to work properly, the interface to the Oracle had to change.
There's only `addPmCts` now, which takes a bag of `PmCt`s. There's a
whole bunch of `PmCt` variants to replace the different oracle functions
from before.
The new `AnnotatedTree` structure allows for more accurate warning
reporting (as evidenced by a number of changes spread throughout GHC's
code base), thus we fix #17465.
Fixes #17646 on the go.
Metric Decrease:
T11822
T9233
PmSeriesS
haddock.compiler
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Currently compacting GC has the invariant that in a chain all fields are tagged
the same. However this does not really hold: root pointers are not tagged, so
when we thread a root we initialize a chain without a tag. When the pointed
objects is evaluated and we have more pointers to it from the heap, we then add
*tagged* fields to the chain (because pointers to it from the heap are tagged),
ending up chaining fields with different tags (pointers from roots are NOT
tagged, pointers from heap are). This breaks the invariant and as a result
compacting GC turns tagged pointers into non-tagged.
This later causes problem in the generated code where we do reads assuming that
the pointer is aligned, e.g.
0x7(%rax) -- assumes that pointer is tagged 1
which causes misaligned reads. This caused #17088.
We fix this using the "pointer tagging for large families" patch (#14373,
!1742):
- With the pointer tagging patch the GC can know what the tagged pointer to a
CONSTR should be (previously we'd need to know the family size -- large
families are always tagged 1, small families are tagged depending on the
constructor).
- Since we now know what the tags should be we no longer need to store the
pointer tag in the info table pointers when forming chains in the compacting
GC.
As a result we no longer need to tag pointers in chains with 1/2 depending on
whether the field points to an info table pointer, or to another field: an info
table pointer is always tagged 0, everything else in the chain is tagged 1. The
lost tags in pointers can be retrieved by looking at the info table.
Finally, instead of using tag 1 for fields and tag 0 for info table pointers, we
use two different tags for fields:
- 1 for fields that have untagged pointers
- 2 for fields that have tagged pointers
When unchaining we then look at the pointer to a field, and depending on its tag
we either leave a tagged pointer or an untagged pointer in the field.
This allows chaining untagged and tagged fields together in compacting GC.
Fixes #17088
Nofib results
-------------
Binaries are smaller because of smaller `Compact.c` code.
make mode=fast EXTRA_RUNTEST_OPTS="-cachegrind" EXTRA_HC_OPTS="-with-rtsopts=-c" NoFibRuns=1
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
CS -0.3% 0.0% +0.0% +0.0% +0.0%
CSD -0.3% 0.0% +0.0% +0.0% +0.0%
FS -0.3% 0.0% +0.0% -0.0% -0.0%
S -0.3% 0.0% +5.4% +0.8% +3.9%
VS -0.3% 0.0% +0.0% -0.0% -0.0%
VSD -0.3% 0.0% -0.0% -0.0% -0.2%
VSM -0.3% 0.0% +0.0% +0.0% +0.0%
anna -0.1% 0.0% +0.0% +0.0% +0.0%
ansi -0.3% 0.0% +0.1% +0.0% +0.0%
atom -0.2% 0.0% +0.0% +0.0% +0.0%
awards -0.2% 0.0% +0.0% 0.0% -0.0%
banner -0.3% 0.0% +0.0% +0.0% +0.0%
bernouilli -0.3% 0.0% +0.1% +0.0% +0.0%
binary-trees -0.2% 0.0% +0.0% 0.0% +0.0%
boyer -0.3% 0.0% +0.2% +0.0% +0.0%
boyer2 -0.2% 0.0% +0.2% +0.1% +0.0%
bspt -0.2% 0.0% +0.0% +0.0% +0.0%
cacheprof -0.2% 0.0% +0.0% +0.0% +0.0%
calendar -0.3% 0.0% +0.0% +0.0% +0.0%
cichelli -0.3% 0.0% +1.1% +0.2% +0.5%
circsim -0.2% 0.0% +0.0% -0.0% -0.0%
clausify -0.3% 0.0% +0.0% -0.0% -0.0%
comp_lab_zift -0.2% 0.0% +0.0% +0.0% +0.0%
compress -0.3% 0.0% +0.0% +0.0% +0.0%
compress2 -0.3% 0.0% +0.0% -0.0% -0.0%
constraints -0.3% 0.0% +0.2% +0.1% +0.1%
cryptarithm1 -0.3% 0.0% +0.0% -0.0% 0.0%
cryptarithm2 -0.3% 0.0% +0.0% +0.0% +0.0%
cse -0.3% 0.0% +0.0% +0.0% +0.0%
digits-of-e1 -0.3% 0.0% +0.0% +0.0% +0.0%
digits-of-e2 -0.3% 0.0% +0.0% +0.0% -0.0%
dom-lt -0.2% 0.0% +0.0% +0.0% +0.0%
eliza -0.2% 0.0% +0.0% +0.0% +0.0%
event -0.3% 0.0% +0.1% +0.0% -0.0%
exact-reals -0.2% 0.0% +0.0% +0.0% +0.0%
exp3_8 -0.3% 0.0% +0.0% +0.0% +0.0%
expert -0.2% 0.0% +0.0% +0.0% +0.0%
fannkuch-redux -0.3% 0.0% -0.0% -0.0% -0.0%
fasta -0.3% 0.0% +0.0% +0.0% +0.0%
fem -0.2% 0.0% +0.1% +0.0% +0.0%
fft -0.2% 0.0% +0.0% -0.0% -0.0%
fft2 -0.2% 0.0% +0.0% -0.0% +0.0%
fibheaps -0.3% 0.0% +0.0% -0.0% -0.0%
fish -0.3% 0.0% +0.0% +0.0% +0.0%
fluid -0.2% 0.0% +0.4% +0.1% +0.1%
fulsom -0.2% 0.0% +0.0% +0.0% +0.0%
gamteb -0.2% 0.0% +0.1% +0.0% +0.0%
gcd -0.3% 0.0% +0.0% +0.0% +0.0%
gen_regexps -0.3% 0.0% +0.0% -0.0% -0.0%
genfft -0.3% 0.0% +0.0% +0.0% +0.0%
gg -0.2% 0.0% +0.7% +0.3% +0.2%
grep -0.2% 0.0% +0.0% +0.0% +0.0%
hidden -0.2% 0.0% +0.0% +0.0% +0.0%
hpg -0.2% 0.0% +0.1% +0.0% +0.0%
ida -0.3% 0.0% +0.0% +0.0% +0.0%
infer -0.2% 0.0% +0.0% -0.0% -0.0%
integer -0.3% 0.0% +0.0% +0.0% +0.0%
integrate -0.2% 0.0% +0.0% +0.0% +0.0%
k-nucleotide -0.2% 0.0% +0.0% +0.0% -0.0%
kahan -0.3% 0.0% -0.0% -0.0% -0.0%
knights -0.3% 0.0% +0.0% -0.0% -0.0%
lambda -0.3% 0.0% +0.0% -0.0% -0.0%
last-piece -0.3% 0.0% +0.0% +0.0% +0.0%
lcss -0.3% 0.0% +0.0% +0.0% 0.0%
life -0.3% 0.0% +0.0% -0.0% -0.0%
lift -0.2% 0.0% +0.0% +0.0% +0.0%
linear -0.2% 0.0% +0.0% +0.0% +0.0%
listcompr -0.3% 0.0% +0.0% +0.0% +0.0%
listcopy -0.3% 0.0% +0.0% +0.0% +0.0%
maillist -0.3% 0.0% +0.0% -0.0% -0.0%
mandel -0.2% 0.0% +0.0% +0.0% +0.0%
mandel2 -0.3% 0.0% +0.0% +0.0% +0.0%
mate -0.2% 0.0% +0.0% +0.0% +0.0%
minimax -0.3% 0.0% +0.0% +0.0% +0.0%
mkhprog -0.2% 0.0% +0.0% +0.0% +0.0%
multiplier -0.3% 0.0% +0.0% -0.0% -0.0%
n-body -0.2% 0.0% -0.0% -0.0% -0.0%
nucleic2 -0.2% 0.0% +0.0% +0.0% +0.0%
para -0.2% 0.0% +0.0% -0.0% -0.0%
paraffins -0.3% 0.0% +0.0% -0.0% -0.0%
parser -0.2% 0.0% +0.0% +0.0% +0.0%
parstof -0.2% 0.0% +0.8% +0.2% +0.2%
pic -0.2% 0.0% +0.1% -0.1% -0.1%
pidigits -0.3% 0.0% +0.0% +0.0% +0.0%
power -0.2% 0.0% +0.0% -0.0% -0.0%
pretty -0.3% 0.0% -0.0% -0.0% -0.1%
primes -0.3% 0.0% +0.0% +0.0% -0.0%
primetest -0.2% 0.0% +0.0% -0.0% -0.0%
prolog -0.3% 0.0% +0.0% -0.0% -0.0%
puzzle -0.3% 0.0% +0.0% +0.0% +0.0%
queens -0.3% 0.0% +0.0% +0.0% +0.0%
reptile -0.2% 0.0% +0.2% +0.1% +0.0%
reverse-complem -0.3% 0.0% +0.0% +0.0% +0.0%
rewrite -0.3% 0.0% +0.0% -0.0% -0.0%
rfib -0.2% 0.0% +0.0% +0.0% -0.0%
rsa -0.2% 0.0% +0.0% +0.0% +0.0%
scc -0.3% 0.0% -0.0% -0.0% -0.1%
sched -0.3% 0.0% +0.0% +0.0% +0.0%
scs -0.2% 0.0% +0.1% +0.0% +0.0%
simple -0.2% 0.0% +3.4% +1.0% +1.8%
solid -0.2% 0.0% +0.0% +0.0% +0.0%
sorting -0.3% 0.0% +0.0% +0.0% +0.0%
spectral-norm -0.2% 0.0% -0.0% -0.0% -0.0%
sphere -0.2% 0.0% +0.0% +0.0% +0.0%
symalg -0.2% 0.0% +0.0% +0.0% +0.0%
tak -0.3% 0.0% +0.0% +0.0% -0.0%
transform -0.2% 0.0% +0.2% +0.1% +0.1%
treejoin -0.3% 0.0% +0.2% -0.0% -0.1%
typecheck -0.3% 0.0% +0.0% +0.0% +0.0%
veritas -0.1% 0.0% +0.0% +0.0% +0.0%
wang -0.2% 0.0% +0.0% -0.0% -0.0%
wave4main -0.3% 0.0% +0.0% -0.0% -0.0%
wheel-sieve1 -0.3% 0.0% +0.0% -0.0% -0.0%
wheel-sieve2 -0.3% 0.0% +0.0% -0.0% -0.0%
x2n1 -0.3% 0.0% +0.0% +0.0% +0.0%
--------------------------------------------------------------------------------
Min -0.3% 0.0% -0.0% -0.1% -0.2%
Max -0.1% 0.0% +5.4% +1.0% +3.9%
Geometric Mean -0.3% -0.0% +0.1% +0.0% +0.1%
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
circsim -0.2% 0.0% +1.6% +0.4% +0.7%
constraints -0.3% 0.0% +4.3% +1.5% +2.3%
fibheaps -0.3% 0.0% +3.5% +1.2% +1.3%
fulsom -0.2% 0.0% +3.6% +1.2% +1.8%
gc_bench -0.3% 0.0% +4.1% +1.3% +2.3%
hash -0.3% 0.0% +6.6% +2.2% +3.6%
lcss -0.3% 0.0% +0.7% +0.2% +0.7%
mutstore1 -0.3% 0.0% +4.8% +1.4% +2.8%
mutstore2 -0.3% 0.0% +3.4% +1.0% +1.7%
power -0.2% 0.0% +2.7% +0.6% +1.9%
spellcheck -0.3% 0.0% +1.1% +0.4% +0.4%
--------------------------------------------------------------------------------
Min -0.3% 0.0% +0.7% +0.2% +0.4%
Max -0.2% 0.0% +6.6% +2.2% +3.6%
Geometric Mean -0.3% +0.0% +3.3% +1.0% +1.8%
Metric changes
--------------
While it sounds ridiculous, this change causes increased allocations in
the following tests. We concluded that this change can't cause a
difference in allocations and decided to land this patch. Fluctuations
in "bytes allocated" metric is tracked in #17686.
Metric Increase:
Naperian
T10547
T12150
T12234
T12425
T13035
T5837
T6048
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Also state that a deadlock can happen with the non-threaded runtime.
[ci skip]
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I have seen >20% fluctuations in this number, leading to spurious
failures.
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Previously it had a redundant _entry suffix. We never noticed this
previously presumably because we never generated references to it
(however hard to believe this may be). However, it did start failing in
!1304.
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Closes #17659.
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Currently CI is inexplicably failing with
```
$ git submodule foreach git clean -xdf
fatal: not a git repository: libffi-tarballs/../.git/modules/libffi-tarballs
```
I have no idea how this working tree got into such a state but we do
need to fail more gracefully when it happens. Consequently, we allow the
cleaning step to fail.
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It was deprecated in 2012 with 46258b40
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Namely print the entire exception in hopes that this will help track
down #17649.
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Fixes the calling convention for functions passing raw SSE-register
values by adding padding as needed to get the values in the right
registers. This problem cropped up when some args were unused an dropped
from the live list.
This folds together 2e23e1c7de01c92b038e55ce53d11bf9db993dd4 and
73273be476a8cc6c13368660b042b3b0614fd928 previously from @kavon.
Metric Increase:
T12707
ManyConstructors
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@kavon says that this will improve block layout for stack checks.
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Fixes #13904.
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Fixes #17662
[ci skip]
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Stack squeezing is done on context switch, not on GC or stack overflow.
Fix the documentation.
Fixes #17685
[ci skip]
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Not all runners have symlink permissions enabled.
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This reverts commit ce64b397777408731c6dd3f5c55ea8415f9f565b on the
grounds of the regression it would introduce in a couple of packages.
Fixes #17653.
Also undoes a slight metric increase in #13701 introduced by that commit
that we didn't see prior to !1983.
Metric Decrease:
T13701
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Allow removing the no longer needed cgPrimOp, getting rid of a small a
small layer violation too.
Change which made the special case no longer needed was #6135 /
6579a6c73082387f82b994305011f011d9d8382b, which dates back to 2013,
making me feel better.
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`OpDest` was basically a defunctionalization. Just turn the code that
cased on it into those functions, and call them directly.
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Before, it was a panic because it was handled above. But there must have
been an error in my reasoning (another caller?) because #17442 reported
the panic was hit.
But, rather than figuring out what happened, I can just make it
impossible by construction. By adding just a bit more bureaucracy in the
return types, I can handle TagToEnum in the same case as all the others,
so the big case is is now total, and the panic is removed.
Fixes #17442
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So that hopefully I understand it faster next time. Also got rid of the
confusing `orig_expr`, which makes the call site in `etaExpand` look out
of sync with the passed `n` (which is not the original `n`).
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This patch clarifies a dark corner of quantified
constraints.
* See Note [Yukky eq_sel for a HoleDest] in TcSMonad
* Minor refactor, breaking out new function
TcInteract.doTopReactEqPred
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The test fails when used with LANG=fr_FR.UTF-8
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Previously we would keep them for two weeks. However, on the stable
branches two weeks can easily elapse with no pushes.
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This changes GHC's treatment of so-called Naughty Quantification
Candidates to issue errors, instead of zapping to Any.
Close #16775.
No new test cases, because existing ones cover this well.
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This patch implements overloaded quotation brackets which generalise the
desugaring of all quotation forms in terms of a new minimal interface.
The main change is that a quotation, for example, [e| 5 |], will now
have type `Quote m => m Exp` rather than `Q Exp`. The `Quote` typeclass
contains a single method for generating new names which is used when
desugaring binding structures.
The return type of functions from the `Lift` type class, `lift` and `liftTyped` have
been restricted to `forall m . Quote m => m Exp` rather than returning a
result in a Q monad.
More details about the feature can be read in the GHC proposal.
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0246-overloaded-bracket.rst
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[skip ci]
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This brings the pretty-printer for Core in line with how visible
type applications are normally printed: namely, with no whitespace
after the `@` character (i.e., `f @a` instead of `f @ a`). While I'm
in town, I also give the same treatment to type abstractions (i.e.,
`\(@a)` instead of `\(@ a)`) and coercion applications (i.e.,
`f @~x` instead of `f @~ x`).
Fixes #17643.
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(cherry picked from commit feb3b955402d53c3875dd7a9a39f322827e5bd69)
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