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Subject: [bug#75745] [PATCH] gnu: hugs: Ignore integer overflow.
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This is required to bootstrap MicroHs.

* gnu/packages/patches/hugs-ignore-integer-overflow.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/hugs.scm (hugs)[source]: Use it.

Change-Id: Ie13085d356f98d4dbb0fd1108b7179ad5226720f
---
See https://github.com/augustss/MicroHs/tree/hugs

It's a strong requirement from Lennart to not remove usage of pattern guards in MicroHs's code, so need help from someone experienced with YACC to add pattern guards support to Hugs, a nice to have, but not required, cherry on top of that: adding bang patterns and "instance forall" support in Hugs.

 gnu/local.mk                                  |  1 +
 gnu/packages/hugs.scm                         |  2 +-
 .../hugs-ignore-integer-overflow.patch        | 55 +++++++++++++++++++
 3 files changed, 57 insertions(+), 1 deletion(-)
 create mode 100644 gnu/packages/patches/hugs-ignore-integer-overflow.patch

diff --git a/gnu/local.mk b/gnu/local.mk
index f118fe4442..ecea6ae9c7 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1569,6 +1569,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/hubbub-sort-entities.patch		\
   %D%/packages/patches/hueplusplus-mbedtls.patch		\
   %D%/packages/patches/hugs-fix-build.patch			\
+  %D%/packages/patches/hugs-ignore-integer-overflow.patch	\
   %D%/packages/patches/hurd-64bit.patch				\
   %D%/packages/patches/hurd-refcounts-assert.patch		\
   %D%/packages/patches/hurd-rumpdisk-no-hd.patch		\
diff --git a/gnu/packages/hugs.scm b/gnu/packages/hugs.scm
index b6a97ea78c..ae7acbd511 100644
--- a/gnu/packages/hugs.scm
+++ b/gnu/packages/hugs.scm
@@ -37,7 +37,7 @@ (define-public hugs
       (sha256
        (base32
         "1mdy4aq4campgmnpc2qwq7bsbfhaxfsqdghbyyz2wms4lnfcmyma"))
-      (patches (search-patches "hugs-fix-build.patch"))))
+      (patches (search-patches "hugs-fix-build.patch" "hugs-ignore-integer-overflow.patch"))))
     (build-system gnu-build-system)
     (arguments
      `(#:phases
diff --git a/gnu/packages/patches/hugs-ignore-integer-overflow.patch b/gnu/packages/patches/hugs-ignore-integer-overflow.patch
new file mode 100644
index 0000000000..ef0b7de824
--- /dev/null
+++ b/gnu/packages/patches/hugs-ignore-integer-overflow.patch
@@ -0,0 +1,55 @@
+From a87d3a15194e4d7724627e43a94ac1d12ab78f9c Mon Sep 17 00:00:00 2001
+From: Lennart Augustsson <lennart@HIDDEN>
+Date: Tue, 21 Jan 2025 12:26:15 -0700
+Subject: [PATCH] Ignore overflow in conversion from Integer to Int.
+
+---
+ src/bignums.c | 24 ++++++++++++++++++++----
+ 1 file changed, 20 insertions(+), 4 deletions(-)
+
+diff --git a/src/bignums.c b/src/bignums.c
+index 32ce528..38ec43f 100644
+--- a/src/bignums.c
++++ b/src/bignums.c
+@@ -196,10 +196,18 @@ Bignum n; {
+ 		while (nonNull(ds=tl(ds))) {
+ 		    Int d = digitOf(hd(ds));
+ 		    if (b > (Int)(MAXHUGSWORD/BIGBASE))
+-			return NIL;
++#if 0
++                      return NIL;
++#else
++                      fprintf(stderr, "Warning: bigToInt overflow ignored\n");
++#endif
+ 		    b *= BIGBASE;
+ 		    if (d > (Int)((MAXHUGSWORD - m)/b))
+-			return NIL;
++#if 0
++                      return NIL;
++#else
++                      fprintf(stderr, "Warning: bigToInt overflow ignored\n");
++#endif
+ 		    m += b*d;
+ 		}
+ 	    } else { /* fst(n)==NEGNUM */
+@@ -207,10 +215,18 @@ Bignum n; {
+ 		while (nonNull(ds=tl(ds))) {
+ 		    Int d = - digitOf(hd(ds));
+ 		    if (b > (MAXPOSINT/BIGBASE))
+-			return NIL;
++#if 0
++                      return NIL;
++#else
++                      fprintf(stderr, "Warning: bigToInt overflow ignored\n");
++#endif
+ 		    b *= BIGBASE;
+ 		    if (d < (MINNEGINT - m)/b)
+-			return NIL;
++#if 0
++                      return NIL;
++#else
++                      fprintf(stderr, "Warning: bigToInt overflow ignored\n");
++#endif
+ 		    m += b*d;
+ 		}
+ 	    }
-- 
2.47.1

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To: Homo <gay@HIDDEN>
Subject: bug#75745: Acknowledgement ([PATCH] gnu: hugs: Ignore integer
 overflow.)
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Date: Wed, 22 Jan 2025 05:52:02 +0000

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Subject: [bug#75745] [PATCH] gnu: hugs: Ignore integer overflow.
Resent-From: Lars-Dominik Braun <lars@HIDDEN>
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Hi,

> This is required to bootstrap MicroHs.

at first glance and without much background knowledge this looks like
a really bad idea(tm). Do you know why this patch is required (i.e. why
MicroHs relies on this specific overflow behavior)?

Lars

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Lars-Dominik Braun kirjoitti 2025-01-24 16:00:
> Hi,
> 
>> This is required to bootstrap MicroHs.
> 
> at first glance and without much background knowledge this looks like
> a really bad idea(tm). Do you know why this patch is required (i.e. why
> MicroHs relies on this specific overflow behavior)?
> 
> Lars

Hi,

No idea, I tried grepping both large numbers and fromInteger usage, as 
well as grep -i overflow, however not crashing in conversion from 
Integer to Int is consistent behavior and might be assumed by a lot of 
packages, like if you try:
ghci> fromInteger (9 ^ 100) :: Int
6627890308811632801

I remember several years ago seeing (unrelated to MicroHs) code that for 
performance reasons uses integer overflow with division by some power of 
2 (i++ / (1 << N)) for circular array (queue) to pass messages between 
threads, so having it overflow or underflow is not always a bug.

This message is sent to 75745 <at> debbugs.gnu.org and so is visible to 
public at https://issues.guix.gnu.org/75745 or if it doesn't work at 
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=75745

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> I remember several years ago seeing (unrelated to MicroHs) code that 
> for performance reasons uses integer overflow with division by some 
> power of 2 (i++ / (1 << N)) for circular array (queue) to pass messages 
> between threads, so having it overflow or underflow is not always a 
> bug.

Correction, it was: i++ & (1 << N)

But you get the idea.

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Hi Lennart,

> If someone fixes all the warnings when compiling Hugs, then I bet this
> problem goes away. But I am not going to do that. In its current state Hugs
> can compile a fully functional MicroHs, and that's enough for me.

actually, I can build the MicroHs package from
https://issues.guix.gnu.org/75778 just fine with our default, unpatched
Hugs. It can also compile/run the example from
https://github.com/augustss/MicroHs?tab=readme-ov-file#example.

Can we therefore just drop this patch? It causes Hugs to die with a
SIGFPE while evaluating the example expression `fromInteger (9 ^ 100)
:: Int` from above, which is rather ugly behavior.

And on an unrelated note: Would it be possible to bootstrap (a possibly
very, very old version of) GHC with MicroHs? (As far as I see our GHC
7 is currently bootstrapped via binaries.)

Lars

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I actually checked carefully. MicroHs does not rely on any overflow
behaviour. There are no large Integers being used.
I believe this is a Hugs bug caused by Hugs assuming that Int is 32 bits,
but being compiled on a 64 bit platform.

Another example of such a bug is that it looks like the StablePtr
implementation casts 64 bit pointers to and from 32 bit int.

If someone fixes all the warnings when compiling Hugs, then I bet this
problem goes away. But I am not going to do that. In its current state Hugs
can compile a fully functional MicroHs, and that's enough for me.

Lennart

On Fri, Jan 24, 2025, 22:06 <gay@HIDDEN> wrote:

> > I remember several years ago seeing (unrelated to MicroHs) code that
> > for performance reasons uses integer overflow with division by some
> > power of 2 (i++ / (1 << N)) for circular array (queue) to pass messages
> > between threads, so having it overflow or underflow is not always a
> > bug.
>
> Correction, it was: i++ & (1 << N)
>
> But you get the idea.
>

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<div dir=3D"auto">I actually checked carefully. MicroHs does not rely on an=
y overflow behaviour. There are no large Integers being used.<div dir=3D"au=
to">I believe this is a Hugs bug caused by Hugs assuming that Int is 32 bit=
s, but being compiled on a 64 bit platform.</div><div dir=3D"auto"><br></di=
v><div dir=3D"auto">Another example of such a bug is that it looks like the=
 StablePtr implementation casts 64 bit pointers to and from 32 bit int.=C2=
=A0</div><div dir=3D"auto"><br></div><div dir=3D"auto">If someone fixes all=
 the warnings when compiling Hugs, then I bet this problem goes away. But I=
 am not going to do that. In its current=C2=A0state Hugs can compile a full=
y functional MicroHs, and that&#39;s enough for me.=C2=A0</div><div dir=3D"=
auto"><br></div><div dir=3D"auto">Lennart</div></div><br><div class=3D"gmai=
l_quote gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Fri=
, Jan 24, 2025, 22:06  &lt;<a href=3D"mailto:gay@HIDDEN">gay@HIDDEN=
rg</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">&gt; I remember s=
everal years ago seeing (unrelated to MicroHs) code that <br>
&gt; for performance reasons uses integer overflow with division by some <b=
r>
&gt; power of 2 (i++ / (1 &lt;&lt; N)) for circular array (queue) to pass m=
essages <br>
&gt; between threads, so having it overflow or underflow is not always a <b=
r>
&gt; bug.<br>
<br>
Correction, it was: i++ &amp; (1 &lt;&lt; N)<br>
<br>
But you get the idea.<br>
</blockquote></div>

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So, it seems random if Hugs need the patch or not.  Which suggests some
undefined behaviour.
But if it works for you without the patch, so much the better.

I have no idea what it would take to compile GHC with MicroHs.  I've not
tried.
I think it might not be too far away.  MicroHs will probably need to get
unboxed types (or at least fake them).  GHC is written fairly
conservatively and is not using all the latest features.
If somebody wants to try, I'm willing to add needed features to MicroHs if
they are not too crazy.


On Sat, Jan 25, 2025 at 3:28=E2=80=AFPM Lars-Dominik Braun <lars@HIDDEN> w=
rote:

> Hi Lennart,
>
> > If someone fixes all the warnings when compiling Hugs, then I bet this
> > problem goes away. But I am not going to do that. In its current state
> Hugs
> > can compile a fully functional MicroHs, and that's enough for me.
>
> actually, I can build the MicroHs package from
> https://issues.guix.gnu.org/75778 just fine with our default, unpatched
> Hugs. It can also compile/run the example from
> https://github.com/augustss/MicroHs?tab=3Dreadme-ov-file#example.
>
> Can we therefore just drop this patch? It causes Hugs to die with a
> SIGFPE while evaluating the example expression `fromInteger (9 ^ 100)
> :: Int` from above, which is rather ugly behavior.
>
> And on an unrelated note: Would it be possible to bootstrap (a possibly
> very, very old version of) GHC with MicroHs? (As far as I see our GHC
> 7 is currently bootstrapped via binaries.)
>
> Lars
>
>

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<div dir=3D"ltr">So, it seems random if Hugs need the patch or not.=C2=A0 W=
hich suggests some undefined behaviour.<div>But if it works for you without=
 the patch, so much the better.</div><div><br></div><div>I have no idea wha=
t it would take to compile GHC with MicroHs.=C2=A0 I&#39;ve not tried.</div=
><div>I think it might not be too far away.=C2=A0 MicroHs will probably nee=
d to get unboxed types (or at least fake them).=C2=A0 GHC is written fairly=
 conservatively and is not using all the latest features.</div><div>If some=
body wants to try, I&#39;m willing to add needed features to MicroHs if the=
y are not too crazy.</div><div><br></div></div><br><div class=3D"gmail_quot=
e gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Sat, Jan =
25, 2025 at 3:28=E2=80=AFPM Lars-Dominik Braun &lt;<a href=3D"mailto:lars@6=
xq.net">lars@HIDDEN</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204=
);padding-left:1ex">Hi Lennart,<br>
<br>
&gt; If someone fixes all the warnings when compiling Hugs, then I bet this=
<br>
&gt; problem goes away. But I am not going to do that. In its current state=
 Hugs<br>
&gt; can compile a fully functional MicroHs, and that&#39;s enough for me.<=
br>
<br>
actually, I can build the MicroHs package from<br>
<a href=3D"https://issues.guix.gnu.org/75778" rel=3D"noreferrer" target=3D"=
_blank">https://issues.guix.gnu.org/75778</a> just fine with our default, u=
npatched<br>
Hugs. It can also compile/run the example from<br>
<a href=3D"https://github.com/augustss/MicroHs?tab=3Dreadme-ov-file#example=
" rel=3D"noreferrer" target=3D"_blank">https://github.com/augustss/MicroHs?=
tab=3Dreadme-ov-file#example</a>.<br>
<br>
Can we therefore just drop this patch? It causes Hugs to die with a<br>
SIGFPE while evaluating the example expression `fromInteger (9 ^ 100)<br>
:: Int` from above, which is rather ugly behavior.<br>
<br>
And on an unrelated note: Would it be possible to bootstrap (a possibly<br>
very, very old version of) GHC with MicroHs? (As far as I see our GHC<br>
7 is currently bootstrapped via binaries.)<br>
<br>
Lars<br>
<br>
</blockquote></div>

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To: Lennart Augustsson <lennart@HIDDEN>, 75745 <75745 <at> debbugs.gnu.org>, Lars-Dominik Braun <lars@HIDDEN>
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I wouldn't hurry to close this thread, as it seems to be 
architecture-specific problem as today macOS runs on ARM, so Guix on 
non-x86 architectures might also be affected.

By the way, I just tested that this code doesn't crash Hugs: fromInteger 
(9^20) :: Int

Honestly I am extremely surprised by your willingness to help to 
bootstrap GHC, as it's hard to find anyone interested in Haskell 
community, and it might be impossible to convince GHC developers to 
cooperate.

However I am content with what I already have as I only wanted minimal 
bootstrappable Haskell compiler which I can flexibly change to port to 
Plan 9 and all architectures it supports, and someone else already 
ported Hugs there.

Having GHC on that minimal and portable system is just too much work and 
once ported won't even be able to build 99% of packages on Stackage 
because Plan 9 is anti-ISO and anti-POSIX, Plan 9 is research OS that 
from the beginning opposes existing standards and so maintaining GHC 
there would make it harder for me to experiment.

Last modified: Sat, 25 Jan 2025 19:45:01 UTC

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