[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 8 commits: [Sized Cmm] properly retain sizes.

Thu Nov 26 08:39:51 UTC 2020

 Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC

Commits:
3cc388ff by Moritz Angermann at 2020-11-26T03:39:33-05:00
[Sized Cmm] properly retain sizes.

This replaces all Word<N> = W<N># Word# and Int<N> = I<N># Int#  with
Word<N> = W<N># Word<N># and Int<N> = I<N># Int<N>#, thus providing us
with properly sized primitives in the codegenerator instead of pretending
they are all full machine words.

This came up when implementing darwinpcs for arm64.  The darwinpcs reqires
us to pack function argugments in excess of registers on the stack.  While
most procedure call standards (pcs) assume arguments are just passed in
8 byte slots; and thus the caller does not know the exact signature to make
the call, darwinpcs requires us to adhere to the prototype, and thus have
the correct sizes.  If we specify CInt in the FFI call, it should correspond
to the C int, and not just be Word sized, when it's only half the size.

This does change the expected output of T16402 but the new result is no
less correct as it eliminates the narrowing (instead of the `and` as was
previously done).

Bumps the array, bytestring, text, and binary submodules.

Co-Authored-By: Ben Gamari <ben at well-typed.com>

Metric Increase:
    T13701
    T14697

- - - - -
8c6a9221 by David Eichmann at 2020-11-26T03:39:33-05:00
ghc-heap: partial TSO/STACK decoding

Co-authored-by: Sven Tennie <sven.tennie at gmail.com>
Co-authored-by: Matthew Pickering <matthewtpickering at gmail.com>
Co-authored-by: Ben Gamari <bgamari.foss at gmail.com>

- - - - -
fae0c218 by Andreas Klebinger at 2020-11-26T03:39:34-05:00
RTS: Fix failed inlining of copy_tag.

On windows using gcc-10 gcc failed to inline copy_tag into evacuate.

To fix this we now set the always_inline attribute for the various
copy* functions in Evac.c. The main motivation here is not the
overhead of the function call, but rather that this allows the code
to "specialize" for the size of the closure we copy which is often
known at compile time.

An earlier commit also tried to avoid evacuate_large inlining. But
didn't quite succeed. So I also marked evacuate_large as noinline.

Fixes #12416

- - - - -
d4f2bb87 by Sylvain Henry at 2020-11-26T03:39:34-05:00
Fix toArgRep to support 64-bit reps on all systems

[This is @Ericson2314 writing a commit message for @hsyl20's patch.]

(Progress towards #11953, #17377, #17375)

`Int64Rep` and `Word64Rep` are currently broken on 64-bit systems.  This
is because they should use "native arg rep" but instead use "large arg
rep" as they do on 32-bit systems, which is either a non-concept or a
128-bit rep depending on one's vantage point.

Now, these reps currently aren't used during 64-bit compilation, so the
brokenness isn't observed, but I don't think that constitutes reasons
not to fix it. Firstly, the linked issues there is a clearly expressed
desire to use explicit-bitwidth constructs in more places. Secondly, per
[1], there are other bugs that *do* manifest from not threading
explicit-bitwidth information all the way through the compilation
pipeline. One can therefore view this as one piece of the larger effort
to do that, improve ergnomics, and squash remaining bugs.

Also, this is needed for !3658. I could just merge this as part of that,
but I'm keen on merging fixes "as they are ready" so the fixes that
aren't ready are isolated and easier to debug.

[1]: https://mail.haskell.org/pipermail/ghc-devs/2020-October/019332.html

- - - - -
c166c1e0 by Tim Barnes at 2020-11-26T03:39:36-05:00
Set dynamic users-guide TOC spacing (fixes #18554)

- - - - -
5d628c26 by Ben Gamari at 2020-11-26T03:39:36-05:00
rts: Use RTS_LIKELY in CHECK

Most compilers probably already infer that
`barf` diverges but it nevertheless doesn't
hurt to be explicit.
- - - - -
e08089a9 by Matthew Pickering at 2020-11-26T03:39:37-05:00
Remove special case for GHC.ByteCode.Instr

This was added in
https://github.com/nomeata/ghc-heap-view/commit/34935206e51b9c86902481d84d2f368a6fd93423

GHC.ByteCode.Instr.BreakInfo no longer exists so the special case is dead code.

Any check like this can be easily dealt with in client code.

- - - - -
dc11a747 by Matthew Pickering at 2020-11-26T03:39:37-05:00
Split Up getClosureDataFromHeapRep

Motivation

1. Don't enforce the repeated decoding of an info table, when the client
can cache it (ghc-debug)
2. Allow the constructor information decoding to be overridden, this
casues segfaults in ghc-debug

- - - - -

30 changed files:

- compiler/GHC/Builtin/Names.hs
- compiler/GHC/Builtin/Types.hs
- compiler/GHC/Builtin/primops.txt.pp
- compiler/GHC/ByteCode/Asm.hs
- compiler/GHC/ByteCode/Types.hs
- compiler/GHC/Cmm.hs
- compiler/GHC/Cmm/Expr.hs
- compiler/GHC/CmmToAsm/Ppr.hs
- compiler/GHC/CmmToC.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Opt/ConstantFold.hs
- compiler/GHC/Core/TyCon.hs
- compiler/GHC/CoreToByteCode.hs
- compiler/GHC/HsToCore/Foreign/Call.hs
- compiler/GHC/HsToCore/Foreign/Decl.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/Runtime/Heap/Inspect.hs
- compiler/GHC/Runtime/Interpreter.hs
- compiler/GHC/Stg/Lift/Analysis.hs
- compiler/GHC/StgToCmm/ArgRep.hs
- compiler/GHC/StgToCmm/DataCon.hs
- compiler/GHC/StgToCmm/Layout.hs
- compiler/GHC/StgToCmm/Prim.hs
- compiler/GHC/StgToCmm/Ticky.hs
- compiler/GHC/StgToCmm/Utils.hs
- compiler/GHC/Types/Literal.hs
- compiler/GHC/Utils/Outputable.hs
- docs/users_guide/conf.py
- ghc/ghc-bin.cabal.in
- includes/Rts.h

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