Hi,
Gently ping this:
https://gcc.gnu.org/pipermail/gcc-patches/2023-March/613497.html
Thanks
Gui Haochen
在 2023/3/7 16:55, HAO CHEN GUI 写道:
> Hi,
> The patch escalates the failure when Hollerith constant to real conversion
> fails in native_interpret_expr. It finally reports an "Cannot simplify
> expression" error in do_simplify method.
>
> 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.
>
> errorcount is used to check if an error is already reported or not when
> getting a bad expr. Buffered errors need to be excluded as they don't
> increase error count either.
>
> The patch passed regression test on Power and x86 linux platforms.
>
> Gui Haochen
> Thanks
>
> ChangeLog
> 2023-03-07 Haochen Gui <guih...@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.
> * fortran/error.cc (gfc_buffered_p): Define.
> * fortran/gfortran.h (gfc_buffered_p): Declare.
> * fortran/intrinsic.cc: Add diagnostic.h to include list.
> (do_simplify): Save errorcount and check it at finish. Report a
> "Cannot simplify expression" error on a bad result if error count
> doesn't change and no other errors buffered.
>
> gcc/testsuite/
> PR target/103628
> * gfortran.dg/pr103628.f90: New.
>
> Co-Authored-By: Tobias Burnus <tob...@codesourcery.com>
>
> 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/error.cc b/gcc/fortran/error.cc
> index 214fb78ba7b..872d42e731e 100644
> --- a/gcc/fortran/error.cc
> +++ b/gcc/fortran/error.cc
> @@ -49,6 +49,13 @@ static gfc_error_buffer error_buffer;
> static output_buffer *pp_error_buffer, *pp_warning_buffer;
> static int warningcount_buffered, werrorcount_buffered;
>
> +/* Return buffered_p. */
> +bool
> +gfc_buffered_p (void)
> +{
> + return buffered_p;
> +}
> +
> /* Return true if there output_buffer is empty. */
>
> static bool
> diff --git a/gcc/fortran/gfortran.h b/gcc/fortran/gfortran.h
> index 219ef8c7612..edfe11796a6 100644
> --- a/gcc/fortran/gfortran.h
> +++ b/gcc/fortran/gfortran.h
> @@ -3328,6 +3328,7 @@ void gfc_internal_error (const char *, ...)
> ATTRIBUTE_NORETURN ATTRIBUTE_GCC_GFC
> void gfc_clear_error (void);
> bool gfc_error_check (void);
> bool gfc_error_flag_test (void);
> +bool gfc_buffered_p (void);
>
> notification gfc_notification_std (int);
> bool gfc_notify_std (int, const char *, ...) ATTRIBUTE_GCC_GFC(2,3);
> diff --git a/gcc/fortran/intrinsic.cc b/gcc/fortran/intrinsic.cc
> index e89131f5a71..9d049001a51 100644
> --- a/gcc/fortran/intrinsic.cc
> +++ b/gcc/fortran/intrinsic.cc
> @@ -25,6 +25,7 @@ along with GCC; see the file COPYING3. If not see
> #include "options.h"
> #include "gfortran.h"
> #include "intrinsic.h"
> +#include "diagnostic.h" /* For errorcount. */
>
> /* Namespace to hold the resolved symbols for intrinsic subroutines. */
> static gfc_namespace *gfc_intrinsic_namespace;
> @@ -4620,6 +4621,7 @@ do_simplify (gfc_intrinsic_sym *specific, gfc_expr *e)
> {
> gfc_expr *result, *a1, *a2, *a3, *a4, *a5, *a6;
> gfc_actual_arglist *arg;
> + int old_errorcount = errorcount;
>
> /* Max and min require special handling due to the variable number
> of args. */
> @@ -4708,7 +4710,12 @@ do_simplify (gfc_intrinsic_sym *specific, gfc_expr *e)
>
> finish:
> if (result == &gfc_bad_expr)
> - return false;
> + {
> + if (errorcount == old_errorcount
> + && (gfc_buffered_p () && !gfc_error_flag_test ()))
> + gfc_error ("Cannot simplify expression at %L", &e->where);
> + return false;
> + }
>
> if (result == NULL)
> resolve_intrinsic (specific, e); /* Must call at run-time */
> 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..255d5bdd73e
> --- /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 "Cannot simplify expression" 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 "Cannot simplify expression" "error" { target powerpc*-*-* } 10
> }
>
