From b9ece695a178319e35cd9f36cc731855302dd57f Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Sat, 13 Apr 2024 19:09:24 +0200
Subject: [PATCH] Fortran: ALLOCATE of fixed-length CHARACTER with SOURCE/MOLD
[PR113793]
F2008 requires for ALLOCATE with SOURCE= or MOLD= specifier that the kind
type parameters of allocate-object and source-expr have the same values.
Add compile-time diagnostics for different character length and a runtime
check (under -fcheck=bounds). Use length from allocate-object to prevent
heap corruption and to allow string padding or truncation on assignment.
gcc/fortran/ChangeLog:
PR fortran/113793
* resolve.cc (resolve_allocate_expr): Reject ALLOCATE with SOURCE=
or MOLD= specifier for unequal length.
* trans-stmt.cc (gfc_trans_allocate): If an allocatable character
variable has fixed length, use it and do not use the source length.
With bounds-checking enabled, add a runtime check for same length.
gcc/testsuite/ChangeLog:
PR fortran/113793
* gfortran.dg/allocate_with_source_29.f90: New test.
* gfortran.dg/allocate_with_source_30.f90: New test.
* gfortran.dg/allocate_with_source_31.f90: New test.
---
gcc/fortran/resolve.cc | 10 ++++
gcc/fortran/trans-stmt.cc | 36 +++++++++++--
.../gfortran.dg/allocate_with_source_29.f90 | 48 +++++++++++++++++
.../gfortran.dg/allocate_with_source_30.f90 | 51 +++++++++++++++++++
.../gfortran.dg/allocate_with_source_31.f90 | 38 ++++++++++++++
5 files changed, 179 insertions(+), 4 deletions(-)
create mode 100644 gcc/testsuite/gfortran.dg/allocate_with_source_29.f90
create mode 100644 gcc/testsuite/gfortran.dg/allocate_with_source_30.f90
create mode 100644 gcc/testsuite/gfortran.dg/allocate_with_source_31.f90
@@ -8278,6 +8278,16 @@ resolve_allocate_expr (gfc_expr *e, gfc_code *code, bool *array_alloc_wo_spec)
goto failure;
}
+ /* Check F2008:C639: "Corresponding kind type parameters of
+ allocate-object and source-expr shall have the same values." */
+ if (e->ts.type == BT_CHARACTER
+ && !e->ts.deferred
+ && e->ts.u.cl->length
+ && code->expr3->ts.type == BT_CHARACTER
+ && !gfc_check_same_strlen (e, code->expr3, "ALLOCATE with "
+ "SOURCE= or MOLD= specifier"))
+ goto failure;
+
/* Check TS18508, C702/C703. */
if (code->expr3->ts.type == BT_DERIVED
&& ((codimension && gfc_expr_attr (code->expr3).event_comp)
@@ -6829,10 +6829,26 @@ gfc_trans_allocate (gfc_code * code, gfc_omp_namelist *omp_allocate)
in the array is needed, which is the product of the len and
esize for char arrays. For unlimited polymorphics len can be
zero, therefore take the maximum of len and one. */
+ tree lhs_len;
+
+ /* If an allocatable character variable has fixed length, use it.
+ Otherwise use source length. As different lengths are not
+ allowed by the standard, generate a runtime check. */
+ if (expr->ts.type == BT_CHARACTER && !expr->ts.deferred)
+ {
+ gfc_trans_same_strlen_check ("ALLOCATE with SOURCE= or MOLD=",
+ &code->expr3->where,
+ se.string_length, expr3_len,
+ &block);
+ lhs_len = fold_convert (TREE_TYPE (expr3_len), se.string_length);
+ }
+ else
+ lhs_len = expr3_len;
+
tmp = fold_build2_loc (input_location, MAX_EXPR,
TREE_TYPE (expr3_len),
- expr3_len, fold_convert (TREE_TYPE (expr3_len),
- integer_one_node));
+ lhs_len, fold_convert (TREE_TYPE (expr3_len),
+ integer_one_node));
tmp = fold_build2_loc (input_location, MULT_EXPR,
TREE_TYPE (expr3_esize), expr3_esize,
fold_convert (TREE_TYPE (expr3_esize), tmp));
@@ -6877,10 +6893,22 @@ gfc_trans_allocate (gfc_code * code, gfc_omp_namelist *omp_allocate)
allocate.
expr3_len is set when expr3 is an unlimited polymorphic
- object or a deferred length string. */
+ object or a deferred length string.
+
+ If an allocatable character variable has fixed length, use it.
+ Otherwise use source length. As different lengths are not
+ allowed by the standard, a runtime check was inserted
+ above. */
if (expr3_len != NULL_TREE)
{
- tmp = fold_convert (TREE_TYPE (expr3_esize), expr3_len);
+ tree lhs_len;
+ if (expr->ts.type == BT_CHARACTER && !expr->ts.deferred)
+ lhs_len = fold_convert (TREE_TYPE (expr3_len),
+ se.string_length);
+ else
+ lhs_len = expr3_len;
+
+ tmp = fold_convert (TREE_TYPE (expr3_esize), lhs_len);
tmp = fold_build2_loc (input_location, MULT_EXPR,
TREE_TYPE (expr3_esize),
expr3_esize, tmp);
new file mode 100644
@@ -0,0 +1,48 @@
+! { dg-do compile }
+! { dg-options "-std=f2008" }
+! PR fortran/113793
+!
+! Static checks of string length for ALLOCATE with SOURCE= or MOLD=
+
+program p
+ implicit none
+ character(kind=1,len=8), allocatable :: a(:), d, b(:,:)
+ character(kind=4,len=6), allocatable :: c(:), e, f(:,:)
+ character(kind=1,len=2) :: c1 = "xx"
+ character(kind=1,len=8) :: c2 = "yy"
+ character(kind=4,len=6) :: c3 = 4_"ww"
+ character(kind=4,len=3) :: c4 = 4_"zz"
+
+ ALLOCATE (a(1),source= "a") ! { dg-error "Unequal character lengths .8/1. " }
+ ALLOCATE (a(2),mold = "bb") ! { dg-error "Unequal character lengths .8/2. " }
+ ALLOCATE (c(3),source=4_"yyy") ! { dg-error "Unequal character lengths .6/3. " }
+ ALLOCATE (c(4),mold =4_"zzzz") ! { dg-error "Unequal character lengths .6/4. " }
+ ALLOCATE (d, source= "12345") ! { dg-error "Unequal character lengths .8/5. " }
+ ALLOCATE (d, source= "12345678")
+ ALLOCATE (d, mold = "123456") ! { dg-error "Unequal character lengths .8/6. " }
+ ALLOCATE (e, source=4_"654321")
+ ALLOCATE (e, mold =4_"7654321") ! { dg-error "Unequal character lengths .6/7. " }
+ ALLOCATE (a(5),source=c1) ! { dg-error "Unequal character lengths .8/2. " }
+ ALLOCATE (a(6),mold =c1) ! { dg-error "Unequal character lengths .8/2. " }
+ ALLOCATE (c(7),source=c4) ! { dg-error "Unequal character lengths .6/3. " }
+ ALLOCATE (c(8),mold =c4) ! { dg-error "Unequal character lengths .6/3. " }
+ ALLOCATE (a,source=[c1,c1,c1]) ! { dg-error "Unequal character lengths .8/2. " }
+ ALLOCATE (a,source=[c2,c2,c2])
+ ALLOCATE (c,source=[c3,c3])
+ ALLOCATE (c,source=[c4,c4]) ! { dg-error "Unequal character lengths .6/3. " }
+ ALLOCATE (d,source=c1) ! { dg-error "Unequal character lengths .8/2. " }
+ ALLOCATE (e,source=c4) ! { dg-error "Unequal character lengths .6/3. " }
+ ALLOCATE (b,source=reshape([c1],[1,1])) ! { dg-error "Unequal character lengths .8/2. " }
+ ALLOCATE (b,source=reshape([c2],[1,1]))
+ ALLOCATE (f,source=reshape([c3],[1,1]))
+ ALLOCATE (f,source=reshape([c4],[1,1])) ! { dg-error "Unequal character lengths .6/3. " }
+contains
+ subroutine foo (s)
+ character(*), intent(in) :: s
+ character(len=8), allocatable :: f(:), g
+ ALLOCATE (f(3), source=s)
+ ALLOCATE (d, source=s)
+ ALLOCATE (f(3), mold=s)
+ ALLOCATE (d, mold=s)
+ end
+end
new file mode 100644
@@ -0,0 +1,51 @@
+! { dg-do run }
+! { dg-additional-options "-std=f2008 -fcheck=bounds -g -fdump-tree-original" }
+! { dg-output "At line 43 .*" }
+! { dg-shouldfail "Unequal character lengths .3/2. in ALLOCATE with SOURCE= or MOLD=" }
+!
+! PR fortran/113793
+!
+! Test runtime checks of string length for ALLOCATE with SOURCE= or MOLD=
+
+program p
+ implicit none
+ character(kind=1,len=2) :: c1 = "xx"
+ character(kind=1,len=8) :: c2 = "yy"
+ character(kind=4,len=6) :: c3 = 4_"ww"
+ call sub1 (len (c2), c2)
+ call sub4 (len (c3), c3)
+ call test (len (c1) + 1, c1)
+contains
+ subroutine sub1 (n, s)
+ integer, intent(in) :: n
+ character(*), intent(in) :: s
+ character(len=8), allocatable :: f(:), g
+ character(len=n), allocatable :: h(:), j
+ ALLOCATE (f(7), source=s)
+ ALLOCATE (g, source=s)
+ ALLOCATE (h(5), mold=s)
+ ALLOCATE (j, mold=s)
+ end
+ subroutine sub4 (n, s)
+ integer, intent(in) :: n
+ character(kind=4,len=*), intent(in) :: s
+ character(kind=4,len=6), allocatable :: f(:), g
+ character(kind=4,len=n), allocatable :: h(:), j
+ ALLOCATE (f(3), source=s)
+ ALLOCATE (g, source=s)
+ ALLOCATE (h(5), mold=s)
+ ALLOCATE (j, mold=s)
+ end
+ subroutine test (n, s)
+ integer, intent(in) :: n
+ character(*), intent(in) :: s
+ character(len=n), allocatable :: str
+ ALLOCATE (str, source=s)
+ end
+end
+
+! { dg-final { scan-tree-dump-times "__builtin_malloc .72.;" 1 "original" } }
+! { dg-final { scan-tree-dump-times "__builtin_malloc .24.;" 1 "original" } }
+! { dg-final { scan-tree-dump-times "__builtin_malloc .56.;" 1 "original" } }
+! { dg-final { scan-tree-dump-times "__builtin_malloc .8.;" 1 "original" } }
+! { dg-final { scan-tree-dump-times "ALLOCATE with SOURCE= or MOLD=" 9 "original" } }
new file mode 100644
@@ -0,0 +1,38 @@
+! { dg-do run }
+! { dg-additional-options "-std=gnu -fcheck=no-bounds" }
+!
+! PR fortran/113793
+!
+! Test extension for ALLOCATE with SOURCE= or MOLD= that strings
+! are truncated or padded and no memory corruption occurs
+
+program p
+ implicit none
+ call test_pad (8, "12345")
+ call test_trunc (6, "123456789")
+contains
+ subroutine test_pad (n, s)
+ integer, intent(in) :: n
+ character(*), intent(in) :: s
+ character(len=n), allocatable :: a(:), b(:,:)
+ if (len (s) >= n) stop 111
+ ALLOCATE (a(100),source=s)
+ ALLOCATE (b(5,6),source=s)
+! print *, ">", a(42), "<"
+! print *, ">", b(3,4), "<"
+ if (a(42) /= s) stop 1
+ if (b(3,4) /= s) stop 2
+ end
+ subroutine test_trunc (n, s)
+ integer, intent(in) :: n
+ character(*), intent(in) :: s
+ character(len=n), allocatable :: a(:), b(:,:)
+ if (len (s) <= n) stop 222
+ ALLOCATE (a(100),source=s)
+ ALLOCATE (b(5,6),source=s)
+! print *, ">", a(42), "<"
+! print *, ">", b(3,4), "<"
+ if (a(42) /= s(1:n)) stop 3
+ if (b(3,4) /= s(1:n)) stop 4
+ end
+end
--
2.35.3