[PATCHv2,gfortran] Escalate failure when Hollerith constant to real conversion fails [PR103628]
Message ID | a59a7554-9f0a-e0ff-5666-629c66174e9a@linux.ibm.com |
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Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Content-Language: en-US To: gcc-patches <gcc-patches@gcc.gnu.org>, fortran <fortran@gcc.gnu.org> Cc: Segher Boessenkool <segher@kernel.crashing.org>, David <dje.gcc@gmail.com>, "Kewen.Lin" <linkw@linux.ibm.com>, Peter Bergner <bergner@linux.ibm.com>, Tobias Burnus <tobias@codesourcery.com> Subject: [PATCHv2, gfortran] Escalate failure when Hollerith constant to real conversion fails [PR103628] Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: yCvx5mvAaZV8YEg9oe_EroX-EQe9iENV X-Proofpoint-ORIG-GUID: 5x7-Ug73K1e8KZ71ZrTuN8LYASgdbSRQ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-03-03_01,2023-03-02_02,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 mlxlogscore=999 mlxscore=0 adultscore=0 lowpriorityscore=0 suspectscore=0 bulkscore=0 spamscore=0 phishscore=0 malwarescore=0 priorityscore=1501 clxscore=1011 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2303030081 X-Spam-Status: No, score=-12.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_EF, GIT_PATCH_0, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list <gcc-patches.gcc.gnu.org> List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-patches>, <mailto:gcc-patches-request@gcc.gnu.org?subject=unsubscribe> List-Archive: <https://gcc.gnu.org/pipermail/gcc-patches/> List-Post: <mailto:gcc-patches@gcc.gnu.org> List-Help: <mailto:gcc-patches-request@gcc.gnu.org?subject=help> List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-patches>, <mailto:gcc-patches-request@gcc.gnu.org?subject=subscribe> From: HAO CHEN GUI via Gcc-patches <gcc-patches@gcc.gnu.org> Reply-To: HAO CHEN GUI <guihaoc@linux.ibm.com> Errors-To: gcc-patches-bounces+patchwork=sourceware.org@gcc.gnu.org Sender: "Gcc-patches" <gcc-patches-bounces+patchwork=sourceware.org@gcc.gnu.org> |
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[PATCHv2,gfortran] Escalate failure when Hollerith constant to real conversion fails [PR103628]
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Commit Message
HAO CHEN GUI
March 3, 2023, 9:12 a.m. UTC
Hi, The patch escalates the failure when Hollerith constant to real conversion fails in native_interpret_expr. It finally reports an "Unclassifiable statement" error. The patch of pr95450 added a verification for decoding/encoding checking in native_interpret_expr. native_interpret_expr may fail on real type conversion and returns a NULL tree then. But upper layer calls don't handle the failure so that an ICE is reported when the verification fails. IBM long double is an example. It doesn't have a unique memory presentation for some real values. So it may not pass the verification. The new test case shows the problem. Compared to last version, this version moves the mpfr_init after NULL tree test and fixes the format problem according to Tobias's advice. Thanks a lot. Gui Haochen Thanks ChangeLog 2023-03-01 Haochen Gui <guihaoc@linux.ibm.com> gcc/ PR target/103628 * fortran/target-memory.cc (gfc_interpret_float): Return FAIL when native_interpret_expr gets a NULL tree. * fortran/arith.cc (gfc_hollerith2real): Return NULL when gfc_interpret_float fails. gcc/testsuite/ PR target/103628 * gfortran.dg/pr103628.f90: New. patch.diff
Comments
Hi, The patch passed regression test on Power linux platforms. Sorry for missing the information. Gui Haochen 在 2023/3/3 17:12, HAO CHEN GUI via Gcc-patches 写道: > Hi, > The patch escalates the failure when Hollerith constant to real conversion > fails in native_interpret_expr. It finally reports an "Unclassifiable > statement" error. > > The patch of pr95450 added a verification for decoding/encoding checking > in native_interpret_expr. native_interpret_expr may fail on real type > conversion and returns a NULL tree then. But upper layer calls don't handle > the failure so that an ICE is reported when the verification fails. > > IBM long double is an example. It doesn't have a unique memory presentation > for some real values. So it may not pass the verification. The new test > case shows the problem. > > Compared to last version, this version moves the mpfr_init after NULL tree > test and fixes the format problem according to Tobias's advice. Thanks a lot. > > Gui Haochen > Thanks > > ChangeLog > 2023-03-01 Haochen Gui <guihaoc@linux.ibm.com> > > gcc/ > PR target/103628 > * fortran/target-memory.cc (gfc_interpret_float): Return FAIL when > native_interpret_expr gets a NULL tree. > * fortran/arith.cc (gfc_hollerith2real): Return NULL when > gfc_interpret_float fails. > > gcc/testsuite/ > PR target/103628 > * gfortran.dg/pr103628.f90: New. > > patch.diff > diff --git a/gcc/fortran/arith.cc b/gcc/fortran/arith.cc > index c0d12cfad9d..d3d38c7eb6a 100644 > --- a/gcc/fortran/arith.cc > +++ b/gcc/fortran/arith.cc > @@ -2752,10 +2752,12 @@ gfc_hollerith2real (gfc_expr *src, int kind) > result = gfc_get_constant_expr (BT_REAL, kind, &src->where); > > hollerith2representation (result, src); > - gfc_interpret_float (kind, (unsigned char *) result->representation.string, > - result->representation.length, result->value.real); > - > - return result; > + if (gfc_interpret_float (kind, > + (unsigned char *) result->representation.string, > + result->representation.length, result->value.real)) > + return result; > + else > + return NULL; > } > > /* Convert character to real. The constant will be padded or truncated. */ > diff --git a/gcc/fortran/target-memory.cc b/gcc/fortran/target-memory.cc > index 7ce7d736629..0c47aa6b842 100644 > --- a/gcc/fortran/target-memory.cc > +++ b/gcc/fortran/target-memory.cc > @@ -416,11 +416,14 @@ gfc_interpret_float (int kind, unsigned char *buffer, size_t buffer_size, > mpfr_t real) > { > gfc_set_model_kind (kind); > - mpfr_init (real); > - gfc_conv_tree_to_mpfr (real, > - native_interpret_expr (gfc_get_real_type (kind), > - buffer, buffer_size)); > > + tree source = native_interpret_expr (gfc_get_real_type (kind), buffer, > + buffer_size); > + if (!source) > + return 0; > + > + mpfr_init (real); > + gfc_conv_tree_to_mpfr (real, source); > return size_float (kind); > } > > diff --git a/gcc/testsuite/gfortran.dg/pr103628.f90 b/gcc/testsuite/gfortran.dg/pr103628.f90 > new file mode 100644 > index 00000000000..e49aefc18fd > --- /dev/null > +++ b/gcc/testsuite/gfortran.dg/pr103628.f90 > @@ -0,0 +1,14 @@ > +! { dg-do compile { target powerpc*-*-* } } > +! { dg-options "-O2 -mabi=ibmlongdouble" } > + > +! Test to ensure that it reports an "Unclassifiable statement" error > +! instead of throwing an ICE when the memory represent of the HOLLERITH > +! string is not unique with ibm long double encoding. > + > +program main > + integer, parameter :: k = 16 > + real(kind = k):: b = 4h1234 > +end program main > + > +! { dg-warning "Conversion from HOLLERITH" "warning" { target powerpc*-*-* } 10 } > +! { dg-error "Unclassifiable statement" "error" { target powerpc*-*-* } 10 }
Hi Haochen, thanks for fixing 'gcc/fortran/target-memory.cc'. But could you also include the 'gcc/fortran/intrinsic.cc' change proposed in https://gcc.gnu.org/pipermail/gcc-patches/2023-March/613030.html (and acknowledged by Steve)? This will replace "Unclassifiable statement" by "Cannot simplify expression" which is a bit more helpful. (After doing so, at least the dg-error in your testcase needs to be updated; I assume that it won't affect other testcases, but that needs to be checked. – And you should update the comment in the testcase as well - and in text you will put in the commit log, if applicable.) Additionally, Kewen suggested: > Since this test case is powerpc only, I think it can be moved to gcc/testsuite/gcc.target/powerpc/ppc-fortran. Which sounds reasonable. Otherwise it looks good to me. On 03.03.23 10:12, HAO CHEN GUI wrote: > Hi, > The patch escalates the failure when Hollerith constant to real conversion > fails in native_interpret_expr. It finally reports an "Unclassifiable > statement" error. > > The patch of pr95450 added a verification for decoding/encoding checking > in native_interpret_expr. native_interpret_expr may fail on real type > conversion and returns a NULL tree then. But upper layer calls don't handle > the failure so that an ICE is reported when the verification fails. > > IBM long double is an example. It doesn't have a unique memory presentation > for some real values. So it may not pass the verification. The new test > case shows the problem. > > Compared to last version, this version moves the mpfr_init after NULL tree > test and fixes the format problem according to Tobias's advice. Thanks a lot. (The format issue was actually spotted by Bernhard.) Thanks for working on this! Tobias PS: One can also discuss Steve's suggestion about deprecating Holleriths / guarding the support behind some flag. But I think that's unrelated to this bug fix patch and should be discussed/done separately. > ChangeLog > 2023-03-01 Haochen Gui <guihaoc@linux.ibm.com> > > gcc/ > PR target/103628 > * fortran/target-memory.cc (gfc_interpret_float): Return FAIL when > native_interpret_expr gets a NULL tree. > * fortran/arith.cc (gfc_hollerith2real): Return NULL when > gfc_interpret_float fails. > > gcc/testsuite/ > PR target/103628 > * gfortran.dg/pr103628.f90: New. > > patch.diff > diff --git a/gcc/fortran/arith.cc b/gcc/fortran/arith.cc > index c0d12cfad9d..d3d38c7eb6a 100644 > --- a/gcc/fortran/arith.cc > +++ b/gcc/fortran/arith.cc > @@ -2752,10 +2752,12 @@ gfc_hollerith2real (gfc_expr *src, int kind) > result = gfc_get_constant_expr (BT_REAL, kind, &src->where); > > hollerith2representation (result, src); > - gfc_interpret_float (kind, (unsigned char *) result->representation.string, > - result->representation.length, result->value.real); > - > - return result; > + if (gfc_interpret_float (kind, > + (unsigned char *) result->representation.string, > + result->representation.length, result->value.real)) > + return result; > + else > + return NULL; > } > > /* Convert character to real. The constant will be padded or truncated. */ > diff --git a/gcc/fortran/target-memory.cc b/gcc/fortran/target-memory.cc > index 7ce7d736629..0c47aa6b842 100644 > --- a/gcc/fortran/target-memory.cc > +++ b/gcc/fortran/target-memory.cc > @@ -416,11 +416,14 @@ gfc_interpret_float (int kind, unsigned char *buffer, size_t buffer_size, > mpfr_t real) > { > gfc_set_model_kind (kind); > - mpfr_init (real); > - gfc_conv_tree_to_mpfr (real, > - native_interpret_expr (gfc_get_real_type (kind), > - buffer, buffer_size)); > > + tree source = native_interpret_expr (gfc_get_real_type (kind), buffer, > + buffer_size); > + if (!source) > + return 0; > + > + mpfr_init (real); > + gfc_conv_tree_to_mpfr (real, source); > return size_float (kind); > } > > diff --git a/gcc/testsuite/gfortran.dg/pr103628.f90 b/gcc/testsuite/gfortran.dg/pr103628.f90 > new file mode 100644 > index 00000000000..e49aefc18fd > --- /dev/null > +++ b/gcc/testsuite/gfortran.dg/pr103628.f90 > @@ -0,0 +1,14 @@ > +! { dg-do compile { target powerpc*-*-* } } > +! { dg-options "-O2 -mabi=ibmlongdouble" } > + > +! Test to ensure that it reports an "Unclassifiable statement" error > +! instead of throwing an ICE when the memory represent of the HOLLERITH > +! string is not unique with ibm long double encoding. > + > +program main > + integer, parameter :: k = 16 > + real(kind = k):: b = 4h1234 > +end program main > + > +! { dg-warning "Conversion from HOLLERITH" "warning" { target powerpc*-*-* } 10 } > +! { dg-error "Unclassifiable statement" "error" { target powerpc*-*-* } 10 } ----------------- Siemens Electronic Design Automation GmbH; Anschrift: Arnulfstraße 201, 80634 München; Gesellschaft mit beschränkter Haftung; Geschäftsführer: Thomas Heurung, Frank Thürauf; Sitz der Gesellschaft: München; Registergericht München, HRB 106955
Hi Tobias, 在 2023/3/3 17:29, Tobias Burnus 写道: > But could you also include the 'gcc/fortran/intrinsic.cc' change > proposed in > https://gcc.gnu.org/pipermail/gcc-patches/2023-March/613030.html (and > acknowledged by Steve)? Sure, I will merge it into the patch and do the regression test. Additionally, Kewen suggested: >> Since this test case is powerpc only, I think it can be moved to gcc/testsuite/gcc.target/powerpc/ppc-fortran. > > Which sounds reasonable. Test cases under gcc.target are tested by check-gcc-c. It greps "warning" and "error" (C style, lower case) from the output while check-gcc-fortran greps "Warning" and "Error" (upper case). As the test case needs to check the "Warning" and "Error" messages. I have to put it in gfortran.dg directory. What's your opinion? Gui Haochen Thanks
Hi Haochen, On 03.03.23 10:56, HAO CHEN GUI via Gcc-patches wrote: > Sure, I will merge it into the patch and do the regression test. Thanks :-) > Additionally, Kewen suggested: >>> Since this test case is powerpc only, I think it can be moved to gcc/testsuite/gcc.target/powerpc/ppc-fortran/ppc-fortran.expgcc.target/powerpc/ppc-fortran. >> Which sounds reasonable. > Test cases under gcc.target are tested by check-gcc-c. It greps "warning" > and "error" (C style, lower case) from the output while check-gcc-fortran > greps "Warning" and "Error" (upper case). As the test case needs to check > the "Warning" and "Error" messages. I have to put it in gfortran.dg > directory. What's your opinion? Thanks for digging and giving a reason. Looks as if at some point, adapting gcc/testsuite/gcc.target/powerpc/ppc-fortran/ppc-fortran.exp to handle this as well could make sense. But placing it - as you did - under gcc/testsuite/gfortran.dg is fine and surely the simpler solution. Thus, leave it as it. Thanks, Tobias > > Gui Haochen > Thanks ----------------- Siemens Electronic Design Automation GmbH; Anschrift: Arnulfstraße 201, 80634 München; Gesellschaft mit beschränkter Haftung; Geschäftsführer: Thomas Heurung, Frank Thürauf; Sitz der Gesellschaft: München; Registergericht München, HRB 106955
Hi Haochen, on 2023/3/3 20:54, Tobias Burnus wrote: > Hi Haochen, > > On 03.03.23 10:56, HAO CHEN GUI via Gcc-patches wrote: >> Sure, I will merge it into the patch and do the regression test. > Thanks :-) >> Additionally, Kewen suggested: >>>> Since this test case is powerpc only, I think it can be moved to gcc/testsuite/gcc.target/powerpc/ppc-fortran/ppc-fortran.expgcc.target/powerpc/ppc-fortran. >>> Which sounds reasonable. >> Test cases under gcc.target are tested by check-gcc-c. It greps "warning" >> and "error" (C style, lower case) from the output while check-gcc-fortran >> greps "Warning" and "Error" (upper case). As the test case needs to check >> the "Warning" and "Error" messages. I have to put it in gfortran.dg >> directory. What's your opinion? > > Thanks for digging and giving a reason. +1! I just posted one patch[1] to make ppc-fortran.exp support the need of your patch here, I verified it can work for this revision, could you double check with your updated revision? [1] https://gcc.gnu.org/pipermail/gcc-patches/2023-March/613442.html > > Looks as if at some point, adapting > gcc/testsuite/gcc.target/powerpc/ppc-fortran/ppc-fortran.exp to handle > this as well could make sense. > > But placing it - as you did - under gcc/testsuite/gfortran.dg is fine > and surely the simpler solution. Thus, leave it as it. Yeah, either way works for me. Thanks again! BR, Kewen
diff --git a/gcc/fortran/arith.cc b/gcc/fortran/arith.cc index c0d12cfad9d..d3d38c7eb6a 100644 --- a/gcc/fortran/arith.cc +++ b/gcc/fortran/arith.cc @@ -2752,10 +2752,12 @@ gfc_hollerith2real (gfc_expr *src, int kind) result = gfc_get_constant_expr (BT_REAL, kind, &src->where); hollerith2representation (result, src); - gfc_interpret_float (kind, (unsigned char *) result->representation.string, - result->representation.length, result->value.real); - - return result; + if (gfc_interpret_float (kind, + (unsigned char *) result->representation.string, + result->representation.length, result->value.real)) + return result; + else + return NULL; } /* Convert character to real. The constant will be padded or truncated. */ diff --git a/gcc/fortran/target-memory.cc b/gcc/fortran/target-memory.cc index 7ce7d736629..0c47aa6b842 100644 --- a/gcc/fortran/target-memory.cc +++ b/gcc/fortran/target-memory.cc @@ -416,11 +416,14 @@ gfc_interpret_float (int kind, unsigned char *buffer, size_t buffer_size, mpfr_t real) { gfc_set_model_kind (kind); - mpfr_init (real); - gfc_conv_tree_to_mpfr (real, - native_interpret_expr (gfc_get_real_type (kind), - buffer, buffer_size)); + tree source = native_interpret_expr (gfc_get_real_type (kind), buffer, + buffer_size); + if (!source) + return 0; + + mpfr_init (real); + gfc_conv_tree_to_mpfr (real, source); return size_float (kind); } diff --git a/gcc/testsuite/gfortran.dg/pr103628.f90 b/gcc/testsuite/gfortran.dg/pr103628.f90 new file mode 100644 index 00000000000..e49aefc18fd --- /dev/null +++ b/gcc/testsuite/gfortran.dg/pr103628.f90 @@ -0,0 +1,14 @@ +! { dg-do compile { target powerpc*-*-* } } +! { dg-options "-O2 -mabi=ibmlongdouble" } + +! Test to ensure that it reports an "Unclassifiable statement" error +! instead of throwing an ICE when the memory represent of the HOLLERITH +! string is not unique with ibm long double encoding. + +program main + integer, parameter :: k = 16 + real(kind = k):: b = 4h1234 +end program main + +! { dg-warning "Conversion from HOLLERITH" "warning" { target powerpc*-*-* } 10 } +! { dg-error "Unclassifiable statement" "error" { target powerpc*-*-* } 10 }