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libgccjit: Fix UB in constructor functions #124

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antoyo wants to merge 1 commit from antoyo/gcc:fix/gccjit-cast-ub into trunk
pull from: antoyo/gcc:fix/gccjit-cast-ub
merge into: gcc:trunk
Conversation 11 Commits 1 Files changed 5 +142 -4
antoyo commented 2025-11-14 16:37:54 +00:00
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gcc/jit/ChangeLog:
	PR jit/105296
	* jit-recording.cc: Use dyn_cast_compound_type instead of
	reinterpret_cast.
	* jit-recording.h (dyn_cast_compound_type, is_union): New methods.
	* libgccjit.cc: Use correct cast method instead of
	reinterpret_cast.

gcc/testsuite/ChangeLog:
	PR jit/105296
	* jit.dg/all-non-failing-tests.h: Mention new test.
	* jit.dg/test-aligned-constructor.c: New test.

CC: David Malcolm dmalcolm@redhat.com, jit@gcc.gnu.org

``` gcc/jit/ChangeLog: PR jit/105296 * jit-recording.cc: Use dyn_cast_compound_type instead of reinterpret_cast. * jit-recording.h (dyn_cast_compound_type, is_union): New methods. * libgccjit.cc: Use correct cast method instead of reinterpret_cast. gcc/testsuite/ChangeLog: PR jit/105296 * jit.dg/all-non-failing-tests.h: Mention new test. * jit.dg/test-aligned-constructor.c: New test. ``` CC: David Malcolm <dmalcolm@redhat.com>, <jit@gcc.gnu.org>
libgccjit: Fix UB in constructor functions
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Details
992085c6ae 
gcc/jit/ChangeLog:
	PR jit/105296
	* jit-recording.cc: Use dyn_cast_compound_type instead of
	reinterpret_cast.
	* jit-recording.h (dyn_cast_compound_type, is_union): New methods.
	* libgccjit.cc: Use correct cast method instead of
	reinterpret_cast.

gcc/testsuite/ChangeLog:
	PR jit/105296
	* jit.dg/all-non-failing-tests.h: Mention new test.
	* jit.dg/test-aligned-constructor.c: New test.
forge-bot commented 2025-11-14 16:38:15 +00:00
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antoyo commented 2025-11-14 16:41:28 +00:00
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I checked all the other usages of reinterpret_cast in libgccjit and they seem safe.
Could someone please double-check that?

I checked all the other usages of `reinterpret_cast` in `libgccjit` and they seem safe. Could someone please double-check that?
antoyo reviewed 2025-11-14 16:44:44 +00:00
gcc/testsuite/jit.dg/test-aligned-constructor.c
@ -0,0 +67,4 @@
one,
};
struct_value =
gcc_jit_context_new_struct_constructor (ctxt, NULL, aligned_struct_type,
antoyo commented 2025-11-14 16:44:44 +00:00
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This doesn't seem to trigger the bug in this test on my computer, unfortunately.
The issue is that since it's UB, n_el can get any value and it's often greater than the number of values provided by this function since the latter is very small.
I'm not sure if there would be a better way to test this.

This doesn't seem to trigger the bug in this test on my computer, unfortunately. The issue is that since it's UB, `n_el` can get any value and it's often greater than the number of values provided by this function since the latter is very small. I'm not sure if there would be a better way to test this.
antoyo commented 2025-11-14 16:45:26 +00:00
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/submit

/submit
forge-bot commented 2025-11-14 16:45:42 +00:00
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Version 1 of this pull request has been stored. It includes the following commits:

  • libgccjit: Fix UB in constructor functions - 992085c6ae
<!-- pr-new-version --> Version 1 of this pull request has been stored. It includes the following commits: - libgccjit: Fix UB in constructor functions - 992085c6aefcff49b39e6ae30f0ad79fd17166e8
forge-bot commented 2025-11-14 16:45:44 +00:00
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Pull Request versions:

# Base Head
1 7a5a92a643 992085c6ae (diff)

In order to compare , clone this repository and run

PR=124
git fetch origin "refs/versioned_pull/${PR}/*:refs/versioned_pull/${PR}/*"
PRV1=1
PRV2=2
git range-diff "refs/versioned_pull/${PR}/${PRV1}/base..refs/versioned_pull/${PR}/${PRV1}/head"  "refs/versioned_pull/${PR}/${PRV2}/base..refs/versioned_pull/${PR}/${PRV2}/head"
<!-- pr-versions --> Pull Request versions: | # | Base | Head | | | - | ---- | ---- | - | | 1 | 7a5a92a643b883f3ad3c959045f2cd2d1552c1a6 | 992085c6aefcff49b39e6ae30f0ad79fd17166e8 | [(diff)](https://forge.sourceware.org/gcc/gcc-TEST.git/compare/7a5a92a643b883f3ad3c959045f2cd2d1552c1a6...992085c6aefcff49b39e6ae30f0ad79fd17166e8) | In order to compare , clone this repository and run ``` PR=124 git fetch origin "refs/versioned_pull/${PR}/*:refs/versioned_pull/${PR}/*" PRV1=1 PRV2=2 git range-diff "refs/versioned_pull/${PR}/${PRV1}/base..refs/versioned_pull/${PR}/${PRV1}/head" "refs/versioned_pull/${PR}/${PRV2}/base..refs/versioned_pull/${PR}/${PRV2}/head" ```
forge-bot commented 2025-11-14 16:46:03 +00:00
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Sent patch series version 1 containing 1 patches to gcc-patches mailing list gcc-patches@gcc.gnu.org and cc'd David Malcolm dmalcolm@redhat.com, jit@gcc.gnu.org.
Cover letter

Sent patch series version 1 containing 1 patches to gcc-patches mailing list <gcc-patches@gcc.gnu.org> and cc'd David Malcolm <dmalcolm@redhat.com>, <jit@gcc.gnu.org>. [Cover letter](https://inbox.sourceware.org/test-list/176313874557.940.12594815508268139404.batrachomyomachia.gcc.gcc-TEST.124.1.0@forge-stage.sourceware.org)
linaroci commented 2025-11-15 19:25:06 +00:00
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CI state: success ✅
CI bot https://ci.linaro.org/job/tcwg_gnu_cross_build--master-arm-precommit/141/ : CI bot tcwg_gnu_cross_build--master-arm: Build results
See: https://ci.linaro.org/job/tcwg_gnu_cross_build--master-arm-precommit/141/artifact/artifacts/artifacts.precommit/notify/mail-body.txt

<!-- linaro-ci-status CI bot https://ci.linaro.org/job/tcwg_gnu_cross_build--master-arm-precommit/141/ --> CI state: success :white_check_mark: CI bot https://ci.linaro.org/job/tcwg_gnu_cross_build--master-arm-precommit/141/ : CI bot tcwg_gnu_cross_build--master-arm: Build results See: https://ci.linaro.org/job/tcwg_gnu_cross_build--master-arm-precommit/141/artifact/artifacts/artifacts.precommit/notify/mail-body.txt
linaroci commented 2025-11-16 06:03:29 +00:00
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CI state: success ✅
CI bot https://ci.linaro.org/job/tcwg_gnu_cross_build--master-aarch64-precommit/120/ : CI bot tcwg_gnu_cross_build--master-aarch64: Build results
See: https://ci.linaro.org/job/tcwg_gnu_cross_build--master-aarch64-precommit/120/artifact/artifacts/artifacts.precommit/notify/mail-body.txt

<!-- linaro-ci-status CI bot https://ci.linaro.org/job/tcwg_gnu_cross_build--master-aarch64-precommit/120/ --> CI state: success :white_check_mark: CI bot https://ci.linaro.org/job/tcwg_gnu_cross_build--master-aarch64-precommit/120/ : CI bot tcwg_gnu_cross_build--master-aarch64: Build results See: https://ci.linaro.org/job/tcwg_gnu_cross_build--master-aarch64-precommit/120/artifact/artifacts/artifacts.precommit/notify/mail-body.txt
linaroci commented 2025-11-16 16:47:41 +00:00
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CI state: success ✅
CI bot https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-arm-precommit/134/ : CI bot tcwg_gnu_cross_check_gcc--master-arm: Test results
See: https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-arm-precommit/134/artifact/artifacts/artifacts.precommit/notify/mail-body.txt

Dear contributor,

Our automatic CI successfully passed with your patch(es). Please find some details below.

In  master-arm, after:
  | gcc patch https://forge.sourceware.org/gcc/gcc-TEST/pulls/124
  | Author: Antoni Boucher <bouanto@zoho.com>
  | Date:   Fri Nov 14 11:19:53 2025 -0500
  | 
  |     [PATCH] libgccjit: Fix UB in constructor functions
  |     
  |     gcc/jit/ChangeLog:
  |             PR jit/105296
  |             * jit-recording.cc: Use dyn_cast_compound_type instead of
  | ... 9 lines of the commit log omitted.
  | ... applied on top of baseline commit:
  | 4711901000a c++/modules: Keep tracking instantiations of static class variable templates [PR122625]


Used configuration :
 *CI config* tcwg_gnu_cross_check_gcc master-arm
 *configure and test flags:* --target arm-linux-gnueabihf 

If you have any questions regarding this report, please ask on linaro-toolchain@lists.linaro.org mailing list.

-----------------8<--------------------------8<--------------------------8<--------------------------

The information below contains the details of the failures, and the ways to reproduce a debug environment:

You can find the failure logs in *.log.1.xz files in
 * https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-arm-precommit/134/artifact/artifacts/artifacts.precommit/00-sumfiles/
The full lists of regressions and improvements as well as configure and make commands are in
 * https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-arm-precommit/134/artifact/artifacts/artifacts.precommit/notify/
The list of [ignored] baseline and flaky failures are in
 * https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-arm-precommit/134/artifact/artifacts/artifacts.precommit/sumfiles/xfails.xfail

Current build   : https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-arm-precommit/134/artifact/artifacts
Reference build : https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-arm-build/2428/artifact/artifacts

Warning: we do not enable maintainer-mode nor automatically update
generated files, which may lead to failures if the patch modifies the
master files.
<!-- linaro-ci-status CI bot https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-arm-precommit/134/ --> CI state: success :white_check_mark: CI bot https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-arm-precommit/134/ : CI bot tcwg_gnu_cross_check_gcc--master-arm: Test results See: https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-arm-precommit/134/artifact/artifacts/artifacts.precommit/notify/mail-body.txt ``` Dear contributor, Our automatic CI successfully passed with your patch(es). Please find some details below. In master-arm, after: | gcc patch https://forge.sourceware.org/gcc/gcc-TEST/pulls/124 | Author: Antoni Boucher <bouanto@zoho.com> | Date: Fri Nov 14 11:19:53 2025 -0500 | | [PATCH] libgccjit: Fix UB in constructor functions | | gcc/jit/ChangeLog: | PR jit/105296 | * jit-recording.cc: Use dyn_cast_compound_type instead of | ... 9 lines of the commit log omitted. | ... applied on top of baseline commit: | 4711901000a c++/modules: Keep tracking instantiations of static class variable templates [PR122625] Used configuration : *CI config* tcwg_gnu_cross_check_gcc master-arm *configure and test flags:* --target arm-linux-gnueabihf If you have any questions regarding this report, please ask on linaro-toolchain@lists.linaro.org mailing list. -----------------8<--------------------------8<--------------------------8<-------------------------- The information below contains the details of the failures, and the ways to reproduce a debug environment: You can find the failure logs in *.log.1.xz files in * https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-arm-precommit/134/artifact/artifacts/artifacts.precommit/00-sumfiles/ The full lists of regressions and improvements as well as configure and make commands are in * https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-arm-precommit/134/artifact/artifacts/artifacts.precommit/notify/ The list of [ignored] baseline and flaky failures are in * https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-arm-precommit/134/artifact/artifacts/artifacts.precommit/sumfiles/xfails.xfail Current build : https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-arm-precommit/134/artifact/artifacts Reference build : https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-arm-build/2428/artifact/artifacts Warning: we do not enable maintainer-mode nor automatically update generated files, which may lead to failures if the patch modifies the master files. ```
linaroci commented 2025-11-17 07:55:05 +00:00
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CI state: success ✅
CI bot https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-aarch64-precommit/86/ : CI bot tcwg_gnu_cross_check_gcc--master-aarch64: Test results
See: https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-aarch64-precommit/86/artifact/artifacts/artifacts.precommit/notify/mail-body.txt

Dear contributor,

Our automatic CI successfully passed with your patch(es). Please find some details below.

In  master-aarch64, after:
  | gcc patch https://forge.sourceware.org/gcc/gcc-TEST/pulls/124
  | Author: Antoni Boucher <bouanto@zoho.com>
  | Date:   Fri Nov 14 11:19:53 2025 -0500
  | 
  |     [PATCH] libgccjit: Fix UB in constructor functions
  |     
  |     gcc/jit/ChangeLog:
  |             PR jit/105296
  |             * jit-recording.cc: Use dyn_cast_compound_type instead of
  | ... 9 lines of the commit log omitted.
  | ... applied on top of baseline commit:
  | beba09b5c5a Allow single PHI initial values.


Used configuration :
 *CI config* tcwg_gnu_cross_check_gcc master-aarch64
 *configure and test flags:* --target aarch64-linux-gnu 

If you have any questions regarding this report, please ask on linaro-toolchain@lists.linaro.org mailing list.

-----------------8<--------------------------8<--------------------------8<--------------------------

The information below contains the details of the failures, and the ways to reproduce a debug environment:

You can find the failure logs in *.log.1.xz files in
 * https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-aarch64-precommit/86/artifact/artifacts/artifacts.precommit/00-sumfiles/
The full lists of regressions and improvements as well as configure and make commands are in
 * https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-aarch64-precommit/86/artifact/artifacts/artifacts.precommit/notify/
The list of [ignored] baseline and flaky failures are in
 * https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-aarch64-precommit/86/artifact/artifacts/artifacts.precommit/sumfiles/xfails.xfail

Current build   : https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-aarch64-precommit/86/artifact/artifacts
Reference build : https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-aarch64-build/2425/artifact/artifacts

Warning: we do not enable maintainer-mode nor automatically update
generated files, which may lead to failures if the patch modifies the
master files.
<!-- linaro-ci-status CI bot https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-aarch64-precommit/86/ --> CI state: success :white_check_mark: CI bot https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-aarch64-precommit/86/ : CI bot tcwg_gnu_cross_check_gcc--master-aarch64: Test results See: https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-aarch64-precommit/86/artifact/artifacts/artifacts.precommit/notify/mail-body.txt ``` Dear contributor, Our automatic CI successfully passed with your patch(es). Please find some details below. In master-aarch64, after: | gcc patch https://forge.sourceware.org/gcc/gcc-TEST/pulls/124 | Author: Antoni Boucher <bouanto@zoho.com> | Date: Fri Nov 14 11:19:53 2025 -0500 | | [PATCH] libgccjit: Fix UB in constructor functions | | gcc/jit/ChangeLog: | PR jit/105296 | * jit-recording.cc: Use dyn_cast_compound_type instead of | ... 9 lines of the commit log omitted. | ... applied on top of baseline commit: | beba09b5c5a Allow single PHI initial values. Used configuration : *CI config* tcwg_gnu_cross_check_gcc master-aarch64 *configure and test flags:* --target aarch64-linux-gnu If you have any questions regarding this report, please ask on linaro-toolchain@lists.linaro.org mailing list. -----------------8<--------------------------8<--------------------------8<-------------------------- The information below contains the details of the failures, and the ways to reproduce a debug environment: You can find the failure logs in *.log.1.xz files in * https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-aarch64-precommit/86/artifact/artifacts/artifacts.precommit/00-sumfiles/ The full lists of regressions and improvements as well as configure and make commands are in * https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-aarch64-precommit/86/artifact/artifacts/artifacts.precommit/notify/ The list of [ignored] baseline and flaky failures are in * https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-aarch64-precommit/86/artifact/artifacts/artifacts.precommit/sumfiles/xfails.xfail Current build : https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-aarch64-precommit/86/artifact/artifacts Reference build : https://ci.linaro.org/job/tcwg_gnu_cross_check_gcc--master-aarch64-build/2425/artifact/artifacts Warning: we do not enable maintainer-mode nor automatically update generated files, which may lead to failures if the patch modifies the master files. ```
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