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From 7001d522d0273658d9e1fb12ca104d56bfcae34d Mon Sep 17 00:00:00 2001
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From: Mark Eggleston <markeggleston@gcc.gnu.org>
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Date: Fri, 22 Jan 2021 15:06:08 +0000
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Subject: [PATCH 10/10] Fill in missing array dimensions using the lower bound
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Use -fdec-add-missing-indexes to enable feature. Also enabled by fdec.
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---
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gcc/fortran/lang.opt | 8 ++++++++
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gcc/fortran/options.c | 1 +
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gcc/fortran/resolve.c | 24 ++++++++++++++++++++++++
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gcc/testsuite/gfortran.dg/array_6.f90 | 23 +++++++++++++++++++++++
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gcc/testsuite/gfortran.dg/array_7.f90 | 23 +++++++++++++++++++++++
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gcc/testsuite/gfortran.dg/array_8.f90 | 23 +++++++++++++++++++++++
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6 files changed, 102 insertions(+)
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create mode 100644 gcc/testsuite/gfortran.dg/array_6.f90
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create mode 100644 gcc/testsuite/gfortran.dg/array_7.f90
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create mode 100644 gcc/testsuite/gfortran.dg/array_8.f90
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diff --git a/gcc/fortran/lang.opt b/gcc/fortran/lang.opt
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index 019c798cf09..f27de88ea3f 100644
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--- a/gcc/fortran/lang.opt
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+++ b/gcc/fortran/lang.opt
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@@ -281,6 +281,10 @@ Wmissing-include-dirs
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Fortran
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; Documented in C/C++
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+Wmissing-index
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+Fortran Var(warn_missing_index) Warning LangEnabledBy(Fortran,Wall)
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+Warn that the lower bound of a missing index will be used.
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+
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Wuse-without-only
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Fortran Var(warn_use_without_only) Warning
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Warn about USE statements that have no ONLY qualifier.
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@@ -460,6 +464,10 @@ fdec
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Fortran Var(flag_dec)
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Enable all DEC language extensions.
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+fdec-add-missing-indexes
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+Fortran Var(flag_dec_add_missing_indexes)
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+Enable the addition of missing indexes using their lower bounds.
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+
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fdec-blank-format-item
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Fortran Var(flag_dec_blank_format_item)
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Enable the use of blank format items in format strings.
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diff --git a/gcc/fortran/options.c b/gcc/fortran/options.c
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index 050f56fdc25..c3b2822685d 100644
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--- a/gcc/fortran/options.c
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+++ b/gcc/fortran/options.c
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@@ -84,6 +84,7 @@ set_dec_flags (int value)
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SET_BITFLAG (flag_dec_non_logical_if, value, value);
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SET_BITFLAG (flag_dec_promotion, value, value);
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SET_BITFLAG (flag_dec_sequence, value, value);
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+ SET_BITFLAG (flag_dec_add_missing_indexes, value, value);
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}
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/* Finalize DEC flags. */
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diff --git a/gcc/fortran/resolve.c b/gcc/fortran/resolve.c
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index fe7d0cc5944..0efeedab46e 100644
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--- a/gcc/fortran/resolve.c
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+++ b/gcc/fortran/resolve.c
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@@ -4806,6 +4806,30 @@ compare_spec_to_ref (gfc_array_ref *ar)
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if (ar->type == AR_FULL)
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return true;
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+ if (flag_dec_add_missing_indexes && as->rank > ar->dimen)
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+ {
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+ /* Add in the missing dimensions, assuming they are the lower bound
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+ of that dimension if not specified. */
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+ int j;
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+ if (warn_missing_index)
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+ {
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+ gfc_warning (OPT_Wmissing_index, "Using the lower bound for "
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+ "unspecified dimensions in array reference at %L",
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+ &ar->where);
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+ }
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+ /* Other parts of the code iterate ar->start and ar->end from 0 to
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+ ar->dimen, so it is safe to assume slots from ar->dimen upwards
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+ are unused (i.e. there are no gaps; the specified indexes are
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+ contiguous and start at zero. */
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+ for(j = ar->dimen; j <= as->rank; j++)
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+ {
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+ ar->start[j] = gfc_copy_expr (as->lower[j]);
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+ ar->end[j] = gfc_copy_expr (as->lower[j]);
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+ ar->dimen_type[j] = DIMEN_ELEMENT;
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+ }
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+ ar->dimen = as->rank;
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+ }
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+
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if (as->rank != ar->dimen)
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{
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gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
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diff --git a/gcc/testsuite/gfortran.dg/array_6.f90 b/gcc/testsuite/gfortran.dg/array_6.f90
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new file mode 100644
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index 00000000000..5c26e18ab3e
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--- /dev/null
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+++ b/gcc/testsuite/gfortran.dg/array_6.f90
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@@ -0,0 +1,23 @@
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+! { dg-do run }
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+! { dg-options "-fdec -Wmissing-index" }!
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+! Checks that under-specified arrays (referencing arrays with fewer
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+! dimensions than the array spec) generates a warning.
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+!
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+! Contributed by Jim MacArthur <jim.macarthur@codethink.co.uk>
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+! Updated by Mark Eggleston <mark.eggleston@codethink.co.uk>
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+!
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+
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+program under_specified_array
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+ integer chessboard(8,8)
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+ integer chessboard3d(8,8,3:5)
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+ chessboard(3,1) = 5
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+ chessboard(3,2) = 55
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+ chessboard3d(4,1,3) = 6
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+ chessboard3d(4,1,4) = 66
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+ chessboard3d(4,4,3) = 7
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+ chessboard3d(4,4,4) = 77
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+
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+ if (chessboard(3).ne.5) stop 1 ! { dg-warning "Using the lower bound for unspecified dimensions in array reference" }
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+ if (chessboard3d(4).ne.6) stop 2 ! { dg-warning "Using the lower bound for unspecified dimensions in array reference" }
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+ if (chessboard3d(4,4).ne.7) stop 3 ! { dg-warning "Using the lower bound for unspecified dimensions in array reference" }
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+end program
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diff --git a/gcc/testsuite/gfortran.dg/array_7.f90 b/gcc/testsuite/gfortran.dg/array_7.f90
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new file mode 100644
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index 00000000000..5588a5bd02d
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--- /dev/null
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+++ b/gcc/testsuite/gfortran.dg/array_7.f90
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@@ -0,0 +1,23 @@
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+! { dg-do run }
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+! { dg-options "-fdec-add-missing-indexes -Wmissing-index" }!
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+! Checks that under-specified arrays (referencing arrays with fewer
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+! dimensions than the array spec) generates a warning.
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+!
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+! Contributed by Jim MacArthur <jim.macarthur@codethink.co.uk>
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+! Updated by Mark Eggleston <mark.eggleston@codethink.co.uk>
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+!
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+
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+program under_specified_array
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+ integer chessboard(8,8)
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+ integer chessboard3d(8,8,3:5)
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+ chessboard(3,1) = 5
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+ chessboard(3,2) = 55
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+ chessboard3d(4,1,3) = 6
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+ chessboard3d(4,1,4) = 66
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+ chessboard3d(4,4,3) = 7
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+ chessboard3d(4,4,4) = 77
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+
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+ if (chessboard(3).ne.5) stop 1 ! { dg-warning "Using the lower bound for unspecified dimensions in array reference" }
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+ if (chessboard3d(4).ne.6) stop 2 ! { dg-warning "Using the lower bound for unspecified dimensions in array reference" }
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+ if (chessboard3d(4,4).ne.7) stop 3 ! { dg-warning "Using the lower bound for unspecified dimensions in array reference" }
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+end program
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diff --git a/gcc/testsuite/gfortran.dg/array_8.f90 b/gcc/testsuite/gfortran.dg/array_8.f90
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new file mode 100644
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index 00000000000..f0d2ef5e37d
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--- /dev/null
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+++ b/gcc/testsuite/gfortran.dg/array_8.f90
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@@ -0,0 +1,23 @@
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+! { dg-do compile }
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+! { dg-options "-fdec -fno-dec-add-missing-indexes" }!
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+! Checks that under-specified arrays (referencing arrays with fewer
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+! dimensions than the array spec) generates a warning.
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+!
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+! Contributed by Jim MacArthur <jim.macarthur@codethink.co.uk>
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+! Updated by Mark Eggleston <mark.eggleston@codethink.co.uk>
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+!
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+
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+program under_specified_array
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+ integer chessboard(8,8)
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+ integer chessboard3d(8,8,3:5)
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+ chessboard(3,1) = 5
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+ chessboard(3,2) = 55
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+ chessboard3d(4,1,3) = 6
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+ chessboard3d(4,1,4) = 66
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+ chessboard3d(4,4,3) = 7
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+ chessboard3d(4,4,4) = 77
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+
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+ if (chessboard(3).ne.5) stop 1 ! { dg-error "Rank mismatch" }
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+ if (chessboard3d(4).ne.6) stop 2 ! { dg-error "Rank mismatch" }
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+ if (chessboard3d(4,4).ne.7) stop 3 ! { dg-error "Rank mismatch" }
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+end program
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--
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2.27.0
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