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