[Git][ghc/ghc][wip/simplifier-tweaks] 57 commits: Stop configuring unused Ld command in `settings`

Tue Jul 4 22:12:50 UTC 2023

Simon Peyton Jones pushed to branch wip/simplifier-tweaks at Glasgow Haskell Compiler / GHC

Commits:
ecdc4353 by Rodrigo Mesquita at 2023-06-28T12:24:57-04:00
Stop configuring unused Ld command in `settings`

GHC has no direct dependence on the linker. Rather, we depend upon the C
compiler for linking and an object-merging program (which is typically
`ld`) for production of GHCi objects and merging of C stubs into final
object files.

Despite this, for historical reasons we still recorded information about
the linker into `settings`. Remove these entries from `settings`,
`hadrian/cfg/system.config`, as well as the `configure` logic
responsible for this information.

Closes #23566.

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bf9ec3e4 by Bryan Richter at 2023-06-28T12:25:33-04:00
Remove extraneous debug output

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7eb68dd6 by Bryan Richter at 2023-06-28T12:25:33-04:00
Work with unset vars in -e mode

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49c27936 by Bryan Richter at 2023-06-28T12:25:33-04:00
Pass positional arguments in their positions

By quoting $cmd, the default "bash -i" is a single argument to run, and
no file named "bash -i" actually exists to be run.

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887dc4fc by Bryan Richter at 2023-06-28T12:25:33-04:00
Handle unset value in -e context

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5ffc7d7b by Rodrigo Mesquita at 2023-06-28T21:07:36-04:00
Configure CPP into settings

There is a distinction to be made between the Haskell Preprocessor and
the C preprocessor. The former is used to preprocess Haskell files,
while the latter is used in C preprocessing such as Cmm files.

In practice, they are both the same program (usually the C compiler) but
invoked with different flags.

Previously we would, at configure time, configure the haskell
preprocessor and save the configuration in the settings file, but,
instead of doing the same for CPP, we had hardcoded in GHC that the CPP
program was either `cc -E` or `cpp`.

This commit fixes that asymmetry by also configuring CPP at configure
time, and tries to make more explicit the difference between HsCpp and
Cpp (see Note [Preprocessing invocations]).

Note that we don't use the standard CPP and CPPFLAGS to configure Cpp,
but instead use the non-standard --with-cpp and --with-cpp-flags.
The reason is that autoconf sets CPP to "$CC -E", whereas we expect the
CPP command to be configured as a standalone executable rather than a
command. These are symmetrical with --with-hs-cpp and
--with-hs-cpp-flags.

Cleanup: Hadrian no longer needs to pass the CPP configuration for CPP
         to be C99 compatible through -optP, since we now configure that
         into settings.

Closes #23422

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5efa9ca5 by Ben Gamari at 2023-06-28T21:08:13-04:00
hadrian: Always canonicalize topDirectory

Hadrian's `topDirectory` is intended to provide an absolute path to the
root of the GHC tree. However, if the tree is reached via a symlink this

One question here is whether the `canonicalizePath` call is expensive
enough to warrant caching. In a quick microbenchmark I observed that
`canonicalizePath "."` takes around 10us per call; this seems
sufficiently low not to worry.

Alternatively, another approach here would have been to rather move the
canonicalization into `m4/fp_find_root.m4`. This would have avoided
repeated canonicalization but sadly path canonicalization is a hard
problem in POSIX shell.

Addresses #22451.

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b3e1436f by aadaa_fgtaa at 2023-06-28T21:08:53-04:00
Optimise ELF linker (#23464)

- cache last elements of `relTable`, `relaTable` and `symbolTables` in `ocInit_ELF`
- cache shndx table in ObjectCode
- run `checkProddableBlock` only with debug rts

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30525b00 by Ben Gamari at 2023-06-28T21:09:30-04:00
compiler: Introduce MO_{ACQUIRE,RELEASE}_FENCE

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b787e259 by Ben Gamari at 2023-06-28T21:09:30-04:00
compiler: Drop MO_WriteBarrier

rts: Drop write_barrier

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7550b4a5 by Ben Gamari at 2023-06-28T21:09:30-04:00
rts: Drop load_store_barrier()

This is no longer used.

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d5f2875e by Ben Gamari at 2023-06-28T21:09:31-04:00
rts: Drop last instances of prim_{write,read}_barrier

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965ac2ba by Ben Gamari at 2023-06-28T21:09:31-04:00
rts: Eliminate remaining uses of load_load_barrier

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0fc5cb97 by Sven Tennie at 2023-06-28T21:09:31-04:00
compiler: Drop MO_ReadBarrier

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7a7d326c by Ben Gamari at 2023-06-28T21:09:31-04:00
rts: Drop load_load_barrier

This is no longer used.

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9f63da66 by Sven Tennie at 2023-06-28T21:09:31-04:00
Delete write_barrier function

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bb0ed354 by Ben Gamari at 2023-06-28T21:09:31-04:00
rts: Make collectFreshWeakPtrs definition a prototype

x86-64/Darwin's toolchain inexplicably warns that collectFreshWeakPtrs
needs to be a prototype.

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ef81a1eb by Sven Tennie at 2023-06-28T21:10:08-04:00
Fix number of free double regs

D1..D4 are defined for aarch64 and thus not free.

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c335fb7c by Ryan Scott at 2023-06-28T21:10:44-04:00
Fix typechecking of promoted empty lists

The `'[]` case in `tc_infer_hs_type` is smart enough to handle arity-0 uses of
`'[]` (see the newly added `T23543` test case for an example), but the `'[]`
case in `tc_hs_type` was not. We fix this by changing the `tc_hs_type` case to
invoke `tc_infer_hs_type`, as prescribed in `Note [Future-proofing the type
checker]`.

There are some benign changes to test cases' expected output due to the new
code path using `forall a. [a]` as the kind of `'[]` rather than `[k]`.

Fixes #23543.

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fcf310e7 by Rodrigo Mesquita at 2023-06-28T21:11:21-04:00
Configure MergeObjs supports response files rather than Ld

The previous configuration script to test whether Ld supported response
files was
* Incorrect (see #23542)
* Used, in practice, to check if the *merge objects tool* supported
  response files.

This commit modifies the macro to run the merge objects tool (rather
than Ld), using a response file, and checking the result with $NM

Fixes #23542

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78b2f3cc by Sylvain Henry at 2023-06-28T21:12:02-04:00
JS: fix JS stack printing (#23565)

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9f01d14b by Matthew Pickering at 2023-06-29T04:13:41-04:00
Add -fpolymorphic-specialisation flag (off by default at all optimisation levels)

Polymorphic specialisation has led to a number of hard to diagnose
incorrect runtime result bugs (see #23469, #23109, #21229, #23445) so
this commit introduces a flag `-fpolymorhphic-specialisation` which
allows users to turn on this experimental optimisation if they are
willing to buy into things going very wrong.

Ticket #23469

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b1e611d5 by Ben Gamari at 2023-06-29T04:14:17-04:00
Rip out runtime linker/compiler checks

We used to choose flags to pass to the toolchain at runtime based on the
platform running GHC, and in this commit we drop all of those runtime
linker checks

Ultimately, this represents a change in policy: We no longer adapt at
runtime to the toolchain being used, but rather make final decisions
about the toolchain used at /configure time/
(we have deleted Note [Run-time linker info] altogether!).

This works towards the goal of having all toolchain configuration logic
living in the same place, which facilities the work towards a
runtime-retargetable GHC (see #19877).

As of this commit, the runtime linker/compiler logic was moved to
autoconf, but soon it, and the rest of the existing toolchain
configuration logic, will live in the standalone ghc-toolchain program
(see !9263)

In particular, what used to be done at runtime is now as follows:
* The flags -Wl,--no-as-needed for needed shared libs are configured
  into settings
* The flag -fstack-check is configured into settings
* The check for broken tables-next-to-code was outdated
* We use the configured c compiler by default as the assembler program
* We drop `asmOpts` because we already configure -Qunused-arguments flag
  into settings (see !10589)

Fixes #23562

Co-author: Rodrigo Mesquita (@alt-romes)

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8b35e8ca by Ben Gamari at 2023-06-29T18:46:12-04:00
Define FFI_GO_CLOSURES

The libffi shipped with Apple's XCode toolchain does not contain a
definition of the FFI_GO_CLOSURES macro, despite containing references
to said macro. Work around this by defining the macro, following the
model of a similar workaround in OpenJDK [1].

[1] https://github.com/openjdk/jdk17u-dev/pull/741/files

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d7ef1704 by Ben Gamari at 2023-06-29T18:46:12-04:00
base: Fix incorrect CPP guard

This was guarded on `darwin_HOST_OS` instead of `defined(darwin_HOST_OS)`.

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7c7d1f66 by Ben Gamari at 2023-06-29T18:46:48-04:00
rts/Trace: Ensure that debugTrace arguments are used

As debugTrace is a macro we must take care to ensure that
the fact is clear to the compiler lest we see warnings.

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cb92051e by Ben Gamari at 2023-06-29T18:46:48-04:00
rts: Various warnings fixes

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dec81dd1 by Ben Gamari at 2023-06-29T18:46:48-04:00
hadrian: Ignore warnings in unix and semaphore-compat

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d7f6448a by Matthew Pickering at 2023-06-30T12:38:43-04:00
hadrian: Fix dependencies of docs:* rule

For the docs:* rule we need to actually build the package rather than
just the haddocks for the dependent packages. Therefore we depend on the
.conf files of the packages we are trying to build documentation for as
well as the .haddock files.

Fixes #23472

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cec90389 by sheaf at 2023-06-30T12:39:27-04:00
Add tests for #22106

Fixes #22106

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083794b1 by Torsten Schmits at 2023-07-03T03:27:27-04:00
Add -fbreak-points to control breakpoint insertion

Rather than statically enabling breakpoints only for the interpreter,
this adds a new flag.

Tracking ticket: #23057

MR: !10466

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fd8c5769 by Ben Gamari at 2023-07-03T03:28:04-04:00
rts: Ensure that pinned allocations respect block size

Previously, it was possible for pinned, aligned allocation requests to
allocate beyond the end of the pinned accumulator block. Specifically,
we failed to account for the padding needed to achieve the requested
alignment in the "large object" check. With large alignment requests,
this can result in the allocator using the capability's pinned object
accumulator block to service a request which is larger than
`PINNED_EMPTY_SIZE`.

To fix this we reorganize `allocatePinned` to consistently account for
the alignment padding in all large object checks. This is a bit subtle
as we must handle the case of a small allocation request filling the
accumulator block, as well as large requests.

Fixes #23400.

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98185d52 by Ben Gamari at 2023-07-03T03:28:05-04:00
testsuite: Add test for #23400

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4aac0540 by Ben Gamari at 2023-07-03T03:28:42-04:00
ghc-heap: Support for BLOCKING_QUEUE closures

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03f941f4 by Ben Bellick at 2023-07-03T03:29:29-04:00
Add some structured diagnostics in Tc/Validity.hs

This addresses the work of ticket #20118
Created the following constructors for TcRnMessage
 - TcRnInaccessibleCoAxBranch
 - TcRnPatersonCondFailure

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6074cc3c by Moisés Ackerman at 2023-07-03T03:30:13-04:00
Add failing test case for #23492

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356a2692 by Moisés Ackerman at 2023-07-03T03:30:13-04:00
Use generated src span for catch-all case of record selector functions

This fixes #23492. The problem was that we used the real source span
of the field declaration for the generated catch-all case in the
selector function, in particular in the generated call to
`recSelError`, which meant it was included in the HIE output. Using
`generatedSrcSpan` instead means that it is not included.

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3efe7f39 by Moisés Ackerman at 2023-07-03T03:30:13-04:00
Introduce genLHsApp and genLHsLit helpers in GHC.Rename.Utils

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dd782343 by Moisés Ackerman at 2023-07-03T03:30:13-04:00
Construct catch-all default case using helpers

GHC.Rename.Utils concrete helpers instead of wrapGenSpan + HS AST constructors

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0e09c38e by Ryan Hendrickson at 2023-07-03T03:30:56-04:00
Add regression test for #23549

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32741743 by Alexis King at 2023-07-03T03:31:36-04:00
perf tests: Increase default stack size for MultiLayerModules

An unhelpfully small stack size appears to have been the real culprit
behind the metric fluctuations in #19293. Debugging metric decreases
triggered by !10729 helped to finally identify the problem.

Metric Decrease:
    MultiLayerModules
    MultiLayerModulesTH_Make
    T13701
    T14697

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82ac6bf1 by Bryan Richter at 2023-07-03T03:32:15-04:00
Add missing void prototypes to rts functions

See #23561.

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6078b429 by Ben Gamari at 2023-07-03T03:32:51-04:00
gitlab-ci: Refactor compilation of gen_ci

Flakify and document it, making it far less sensitive to the build
environment.

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aa2db0ae by Ben Gamari at 2023-07-03T03:33:29-04:00
testsuite: Update documentation
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924a2362 by Gregory Gerasev at 2023-07-03T03:34:10-04:00
Better error for data deriving of type synonym/family. Closes #23522

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4457da2a by Dave Barton at 2023-07-03T03:34:51-04:00
Fix some broken links and typos

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2c92d89d by Simon Peyton Jones at 2023-07-03T16:42:22+01:00
Inline more, sooner

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cf51dbd2 by Simon Peyton Jones at 2023-07-03T16:42:22+01:00
One more Simplifier optimistaions

Inline in exprIsConAppMaybe

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3f77a684 by Simon Peyton Jones at 2023-07-03T16:42:22+01:00
Further improvements

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b5f42ed6 by Simon Peyton Jones at 2023-07-03T16:42:22+01:00
Remove trace

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15fde9c9 by Simon Peyton Jones at 2023-07-03T16:42:22+01:00
Add a strategic inline pragma

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095ebff7 by Simon Peyton Jones at 2023-07-03T16:42:22+01:00
Two improvements to coercion optimisation

One (mkSymCo) makes a big difference in GHC.Read
The other (in zapSubstEnv) makes a big diffference in T18223

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f7928e68 by Simon Peyton Jones at 2023-07-03T16:42:22+01:00
Optimise every time we do mkTransCo

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d676ff21 by Simon Peyton Jones at 2023-07-03T16:42:22+01:00
Wibble: remove unused field

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759f1bf8 by Simon Peyton Jones at 2023-07-04T14:57:41+01:00
Fix a total bug in mkSelCo: wrong role

We were simply giving an outright-wrong role to a Refl
coercion in mkSelCo.

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1c5f3a99 by Simon Peyton Jones at 2023-07-04T23:07:55+01:00
Add assert back into mkCast

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8efcee73 by Simon Peyton Jones at 2023-07-04T23:08:42+01:00
Don't repeatedly optimise coercions in simplCast

This matters when we have

  (case x of (a,b) ->
    (case x of (a,b) -> e |> co1
    ) |>  co2
  ) |> co3

Those casts end up successively pushed onto the continuation stack,
and we don't want to optimise (co1;co2) and then (co1;co2;co3) etc.

- - - - -

30 changed files:

- .gitignore
- .gitlab-ci.yml
- .gitlab/ci.sh
- .gitlab/darwin/toolchain.nix
- + .gitlab/generate-ci/LICENSE
- + .gitlab/generate-ci/README.mkd
- + .gitlab/generate-ci/flake.lock
- + .gitlab/generate-ci/flake.nix
- .gitlab/gen_ci.hs → .gitlab/generate-ci/gen_ci.hs
- + .gitlab/generate-ci/generate-ci.cabal
- + .gitlab/generate-ci/generate-job-metadata
- + .gitlab/generate-ci/generate-jobs
- − .gitlab/generate_job_metadata
- − .gitlab/generate_jobs
- compiler/GHC/Cmm/MachOp.hs
- compiler/GHC/Cmm/Parser.y
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/AArch64/Instr.hs
- compiler/GHC/CmmToAsm/AArch64/Ppr.hs
- compiler/GHC/CmmToAsm/PPC/CodeGen.hs
- compiler/GHC/CmmToAsm/Reg/Graph/TrivColorable.hs
- compiler/GHC/CmmToAsm/Wasm/FromCmm.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToC.hs
- compiler/GHC/CmmToLlvm/CodeGen.hs
- compiler/GHC/Core/Coercion.hs
- compiler/GHC/Core/Coercion/Opt.hs
- compiler/GHC/Core/Opt/Simplify/Env.hs
- compiler/GHC/Core/Opt/Simplify/Iteration.hs
- compiler/GHC/Core/Opt/Simplify/Monad.hs

The diff was not included because it is too large.

View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/fe7f28f1c55115ec3b2289dd60e55372c8e14d5d...8efcee737e8dfb7287a5ef9cdca0590a80b70750

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