On Tue, Feb 18, 2020 at 7:29 AM Slava Barinov wrote:
>
> * cp/decl.c (reshape_init_array_1): Enforce constructor creation
> for VLAs when initialized with zero value.
> * testsuite/g++.dg/pr93730.C: New test
> * testsuite/g++.dg/abi/mangle72.C: Change mangling to new version
>
> I'm not sure about fix of c++/58646 but this allows to work around certain
> case
> when we want to initialize VLA with zeroes.
>
> Bootstrapped on x86_64, no testsuite regressions found.
>
> Not sure about mangling: is there any ABI requirements to mangling for cases
> from mangle72.C?
Can you send this patch to gcc-patc...@gcc.gnu.org instead?
gcc-bugs@gcc.gnu.org is more for bugzilla emails.
Thanks,
Andrew
>
> Signed-off-by: Slava Barinov
> ---
> gcc/ChangeLog | 8
> gcc/cp/decl.c | 3 ++-
> gcc/testsuite/g++.dg/abi/mangle72.C | 14 +++---
> gcc/testsuite/g++.dg/pr93730.C | 8
> 4 files changed, 25 insertions(+), 8 deletions(-)
> create mode 100644 gcc/testsuite/g++.dg/pr93730.C
>
> diff --git a/gcc/ChangeLog b/gcc/ChangeLog
> index 7c481407de9..e614552a1a5 100644
> --- a/gcc/ChangeLog
> +++ b/gcc/ChangeLog
> @@ -1,3 +1,11 @@
> +2020-02-18 Vyacheslav Barinov
> +
> + PR c++/93730
> + * cp/decl.c (reshape_init_array_1): Enforce constructor creation
> + for VLAs when initialized with zero value.
> + * testsuite/g++.dg/pr93730.C: New test
> + * testsuite/g++.dg/abi/mangle72.C: Change mangling to new version
> +
> 2020-02-17 Richard Biener
>
> PR c/86134
> diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c
> index 31a556a0a1f..e90a397fc11 100644
> --- a/gcc/cp/decl.c
> +++ b/gcc/cp/decl.c
> @@ -6043,7 +6043,8 @@ reshape_init_array_1 (tree elt_type, tree max_index,
> reshape_iter *d,
> even if the string is empty. */
>tree init_type = TREE_TYPE (elt_init);
>if (POINTER_TYPE_P (elt_type) != POINTER_TYPE_P (init_type)
> - || !type_initializer_zero_p (elt_type, elt_init))
> + || !type_initializer_zero_p (elt_type, elt_init)
> + || sized_array_p)
> last_nonzero = index;
>
>/* This can happen with an invalid initializer (c++/54501). */
> diff --git a/gcc/testsuite/g++.dg/abi/mangle72.C
> b/gcc/testsuite/g++.dg/abi/mangle72.C
> index 656a0cae403..928a38da021 100644
> --- a/gcc/testsuite/g++.dg/abi/mangle72.C
> +++ b/gcc/testsuite/g++.dg/abi/mangle72.C
> @@ -27,16 +27,16 @@ void g__ (Y) { }
> // { dg-final { scan-assembler "_Z3g__1YIXtl1BtlA2_M1AA2_iLS3_0E" } }
>
> void g0_ (Y) { }
> -// { dg-final { scan-assembler "_Z3g0_1YIXtl1BtlA2_M1AA2_iLS3_0E" } }
> +// { dg-final { scan-assembler "_Z3g0_1YIXtl1BtlA2_M1AA2_iLS3_0ELS3_0E"
> } }
>
> void g00 (Y) { }
> -// { dg-final { scan-assembler "_Z3g001YIXtl1BtlA2_M1AA2_iLS3_0E" } }
> +// { dg-final { scan-assembler "_Z3g001YIXtl1BtlA2_M1AA2_iLS3_0ELS3_0E"
> } }
>
> void g0x (Y) { }
> // FIXME: This needs to mangle differently from g00. The space at
> // the end is intentional to make the directive fail so that the xfail
> // can be reminder to change this once the mangling is fixed.
> -// { dg-final { scan-assembler "_Z3g0x1YIXtl1BtlA2_M1AA2_iLS3_0E " {
> xfail *-*-* } } }
> +// { dg-final { scan-assembler "_Z3g0x1YIXtl1BtlA2_M1AA2_iLS3_0ELS3_0E "
> { xfail *-*-* } } }
>
> void gx_ (Y) { }
> // { dg-final { scan-assembler "_Z3gx_1YIXtl1BtlA2_M1AA2_iLS3_0ELS3_0E"
> } }
> @@ -49,17 +49,17 @@ void h___ (Z) { }
> // { dg-final { scan-assembler "_Z4h___1ZIXtl1CtlA3_M1AA2_iLS3_0E" } }
>
> void h0__ (Z) { }
> -// { dg-final { scan-assembler "_Z4h0__1ZIXtl1CtlA3_M1AA2_iLS3_0E" } }
> +// { dg-final { scan-assembler "_Z4h0__1ZIXtl1CtlA3_M1AA2_iLS3_0ELS3_0E"
> } }
>
> void h00_ (Z) { }
> -// { dg-final { scan-assembler "_Z4h00_1ZIXtl1CtlA3_M1AA2_iLS3_0E" } }
> +// { dg-final { scan-assembler
> "_Z4h00_1ZIXtl1CtlA3_M1AA2_iLS3_0ELS3_0ELS3_0E" } }
>
> void h000 (Z) { }
> -// { dg-final { scan-assembler "_Z4h0001ZIXtl1CtlA3_M1AA2_iLS3_0E" } }
> +// { dg-final { scan-assembler
> "_Z4h0001ZIXtl1CtlA3_M1AA2_iLS3_0ELS3_0ELS3_0E" } }
>
> void h00x (Z) { }
> // FIXME: This needs to mangle differently from hx0_ and hx__.
> -// { dg-final { scan-assembler "_Z4h00x1ZIXtl1CtlA3_M1AA2_iLS3_0ELS3_0E
> " { xfail *-*-*} } }
> +// { dg-final { scan-assembler
> "_Z4h00x1ZIXtl1CtlA3_M1AA2_iLS3_0ELS3_0ELS3_0E " { xfail *-*-*} } }
>
> void h0x0 (Z) { }
> // { dg-final { scan-assembler
> "_Z4h0x01ZIXtl1CtlA3_M1AA2_iLS3_0ELS3_0ELS3_0E" } }
> diff --git a/gcc/testsuite/g++.dg/pr93730.C b/gcc/testsuite/g++.dg/pr93730.C
> new file mode 100644
> index 000..066c23a99cb
> --- /dev/null
> +++ b/gcc/testsuite/g++.dg/pr93730.C
> @@ -0,0 +1,8 @@
> +/* { dg-do compile } */
> +/* { dg-additional-options "-Wno-vla" } */
> +
> +int sz = 1;
> +
> +void f() {
> + int arr[1][sz] = { 0 };
> +}
> --
> 2.25.0
