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Subject: bug#20567: guile 2.0.11 - test failures on mips64 big-endian with n32 ABI
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From: "Schaefer, Frank" <frank.schaefer@HIDDEN>
Thread-Topic: guile 2.0.11 - test failures on mips64 big-endian with n32 ABI
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I've encountered two test failures with guile 2.0.11 on mips64 big-endian, =
whenever I build with -mabi=3Dn32 (these test failures do not occur with -m=
abi=3D64).  At least one of them I have resolved with the attached patch.

First testcase failure: test-ffi (fixed by my patch).  The guile code appar=
ently assumes that sizeof(ffi_arg)<=3Dsizeof(void **).  This is a faulty as=
sumption; it holds on *most* platforms, but with the mips64 n32 ABI, sizeof=
(void **)=3D=3D4, and sizeof(ffi_arg)=3D=3D8.  So every foreign function th=
at returns a pointer is liable to corrupt data, and anyone retrieving the r=
eturn value as a simple void * is only going to get sign-extension garbage =
on big-endian (usually NULL).

Second testcase failure: check-guile fails due to 'ERROR: foreign.test: pro=
cedure->pointer: qsort - arguments: ((null-pointer-error "pointer->bytevect=
or" "null pointer dereference" () ()))'.  I strongly suspect it's related t=
o the ffi_arg issue mentioned above, but I'm still peeling away macro uglin=
ess to track it down.  If anyone wants to pitch in with additional guidance=
 or patchwork, I'd be happy to listen and test.

(The patch applies against 2.0.11 release or against current HEAD, where it=
 also fixes the new testcases for test-foreign-object-scm and test-foreign-=
object-c.  HEAD also fails the test-out-of-memory case, though, which precl=
udes further unit tests.)

--_002_14E7D810D073F84195C3EE3EBF1E9C35746EB81CUSPLNOEXM01Pglo_
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	name="0001-use-ffi_arg-instead-of-void-to-hold-FFI-call-return-.patch"
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	filename="0001-use-ffi_arg-instead-of-void-to-hold-FFI-call-return-.patch";
	size=1414; creation-date="Wed, 13 May 2015 18:29:56 GMT";
	modification-date="Wed, 13 May 2015 18:29:09 GMT"
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: "Schaefer, Frank" <frank.schaefer@HIDDEN>
Subject: bug#20567: Acknowledgement (guile 2.0.11 - test failures on
 mips64 big-endian with n32 ABI)
Message-ID: <handler.20567.B.14315439479864.ack <at> debbugs.gnu.org>
References: <14E7D810D073F84195C3EE3EBF1E9C35746EB81C@HIDDEN>
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Date: Wed, 13 May 2015 19:06:03 +0000

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Message sent to bug-guile@HIDDEN:

Subject: bug#20567: guile 2.0.11 - test failures on mips64 big-endian with n32 ABI
Resent-From: Andy Wingo <wingo@HIDDEN>
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 (Frank Schaefer's message of "Wed, 13 May 2015 18:31:12 +0000")
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Mark does this ring a bell to you?  I know you have a mip64 n32 machine
that you use sometimes.

Andy

On Wed 13 May 2015 20:31, "Schaefer, Frank" <frank.schaefer@HIDDEN> writes:

> I've encountered two test failures with guile 2.0.11 on mips64
> big-endian, whenever I build with -mabi=n32 (these test failures do
> not occur with -mabi=64).  At least one of them I have resolved with
> the attached patch.
>
> First testcase failure: test-ffi (fixed by my patch).  The guile code
> apparently assumes that sizeof(ffi_arg)<=sizeof(void **).  This is a
> faulty assumption; it holds on *most* platforms, but with the mips64
> n32 ABI, sizeof(void **)==4, and sizeof(ffi_arg)==8.  So every foreign
> function that returns a pointer is liable to corrupt data, and anyone
> retrieving the return value as a simple void * is only going to get
> sign-extension garbage on big-endian (usually NULL).
>
> Second testcase failure: check-guile fails due to 'ERROR:
> foreign.test: procedure->pointer: qsort - arguments:
> ((null-pointer-error "pointer->bytevector" "null pointer dereference"
> () ()))'.  I strongly suspect it's related to the ffi_arg issue
> mentioned above, but I'm still peeling away macro ugliness to track it
> down.  If anyone wants to pitch in with additional guidance or
> patchwork, I'd be happy to listen and test.
>
> (The patch applies against 2.0.11 release or against current HEAD,
> where it also fixes the new testcases for test-foreign-object-scm and
> test-foreign-object-c.  HEAD also fails the test-out-of-memory case,
> though, which precludes further unit tests.)

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