From cc87ddb841017bb0976b05091733609ee17d7f05 Mon Sep 17 00:00:00 2001
From: Mark Eggleston <markeggleston@gcc.gnu.org>
Date: Fri, 22 Jan 2021 13:15:17 +0000
Subject: [PATCH 07/10] Allow non-logical expressions in IF statements
Use -fdec-non-logical-if to enable feature. Also enabled using -fdec.
---
gcc/fortran/lang.opt | 4 ++
gcc/fortran/options.cc | 1 +
gcc/fortran/resolve.cc | 60 ++++++++++++++++---
...gical_expressions_if_statements_blocks_1.f | 25 ++++++++
...gical_expressions_if_statements_blocks_2.f | 25 ++++++++
...gical_expressions_if_statements_blocks_3.f | 25 ++++++++
...gical_expressions_if_statements_blocks_4.f | 45 ++++++++++++++
...gical_expressions_if_statements_blocks_5.f | 45 ++++++++++++++
...gical_expressions_if_statements_blocks_6.f | 45 ++++++++++++++
9 files changed, 266 insertions(+), 9 deletions(-)
create mode 100644 gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_1.f
create mode 100644 gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_2.f
create mode 100644 gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_3.f
create mode 100644 gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_4.f
create mode 100644 gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_5.f
create mode 100644 gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_6.f
diff --git a/gcc/fortran/lang.opt b/gcc/fortran/lang.opt
index 4a269ebb22d..d886c2f33ed 100644
--- a/gcc/fortran/lang.opt
+++ b/gcc/fortran/lang.opt
@@ -502,6 +502,10 @@ fdec-math
Fortran Var(flag_dec_math)
Enable legacy math intrinsics for compatibility.
+fdec-non-logical-if
+Fortran Var(flag_dec_non_logical_if)
+Enable support for non-logical expressions in if statements.
+
fdec-override-kind
Fortran Var(flag_dec_override_kind)
Enable support for per variable kind specification.
diff --git a/gcc/fortran/options.cc b/gcc/fortran/options.cc
index edbab483b36..a946c86790a 100644
--- a/gcc/fortran/options.cc
+++ b/gcc/fortran/options.cc
@@ -79,6 +79,7 @@ set_dec_flags (int value)
SET_BITFLAG (flag_dec_char_conversions, value, value);
SET_BITFLAG (flag_dec_duplicates, value, value);
SET_BITFLAG (flag_dec_override_kind, value, value);
+ SET_BITFLAG (flag_dec_non_logical_if, value, value);
}
/* Finalize DEC flags. */
diff --git a/gcc/fortran/resolve.cc b/gcc/fortran/resolve.cc
index bc0df0fdb99..07dd039f3bf 100644
--- a/gcc/fortran/resolve.cc
+++ b/gcc/fortran/resolve.cc
@@ -10789,10 +10789,31 @@ gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
switch (b->op)
{
case EXEC_IF:
- if (t && b->expr1 != NULL
- && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
- gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
- &b->expr1->where);
+ if (t && b->expr1 != NULL)
+ {
+ if (flag_dec_non_logical_if && b->expr1->ts.type != BT_LOGICAL)
+ {
+ gfc_expr* cast;
+ cast = gfc_ne (b->expr1,
+ gfc_get_int_expr (1, &gfc_current_locus, 0),
+ INTRINSIC_NE);
+ if (cast == NULL)
+ gfc_internal_error ("gfc_resolve_blocks(): Failed to cast "
+ "to LOGICAL in IF");
+ b->expr1 = cast;
+ if (warn_conversion_extra)
+ {
+ gfc_warning (OPT_Wconversion_extra, "Non-LOGICAL type in"
+ " IF statement condition %L will be true if"
+ " it evaluates to nonzero",
+ &b->expr1->where);
+ }
+ }
+
+ if ((b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
+ gfc_error ("IF clause at %L requires a scalar LOGICAL "
+ "expression", &b->expr1->where);
+ }
break;
case EXEC_WHERE:
@@ -12093,11 +12114,32 @@ start:
break;
case EXEC_IF:
- if (t && code->expr1 != NULL
- && (code->expr1->ts.type != BT_LOGICAL
- || code->expr1->rank != 0))
- gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
- &code->expr1->where);
+ if (t && code->expr1 != NULL)
+ {
+ if (flag_dec_non_logical_if
+ && code->expr1->ts.type != BT_LOGICAL)
+ {
+ gfc_expr* cast;
+ cast = gfc_ne (code->expr1,
+ gfc_get_int_expr (1, &gfc_current_locus, 0),
+ INTRINSIC_NE);
+ if (cast == NULL)
+ gfc_internal_error ("gfc_resolve_code(): Failed to cast "
+ "to LOGICAL in IF");
+ code->expr1 = cast;
+ if (warn_conversion_extra)
+ {
+ gfc_warning (OPT_Wconversion_extra, "Non-LOGICAL type in"
+ " IF statement condition %L will be true if"
+ " it evaluates to nonzero",
+ &code->expr1->where);
+ }
+ }
+
+ if (code->expr1->ts.type != BT_LOGICAL || code->expr1->rank != 0)
+ gfc_error ("IF clause at %L requires a scalar LOGICAL "
+ "expression", &code->expr1->where);
+ }
break;
case EXEC_CALL:
diff --git a/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_1.f b/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_1.f
new file mode 100644
index 00000000000..0101db893ca
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_1.f
@@ -0,0 +1,25 @@
+! { dg-do run }
+! { dg-options "-fdec -Wconversion-extra" }
+!
+! Allow logical expressions in if statements and blocks
+!
+! Contributed by Francisco Redondo Marchena <francisco.marchema@codethink.co.uk>
+! and Jeff Law <law@redhat.com>
+! Modified by Mark Eggleston <mark.eggleston@codethink.com>
+!
+ PROGRAM logical_exp_if_st_bl
+ INTEGER ipos/1/
+ INTEGER ineg/0/
+
+ ! Test non logical variables
+ if (ineg) STOP 1 ! { dg-warning "if it evaluates to nonzero" }
+ if (0) STOP 2 ! { dg-warning "if it evaluates to nonzero" }
+
+ ! Test non logical expressions in if statements
+ if (MOD(ipos, 1)) STOP 3 ! { dg-warning "if it evaluates to nonzero" }
+
+ ! Test non logical expressions in if blocks
+ if (MOD(2 * ipos, 2)) then ! { dg-warning "if it evaluates to nonzero" }
+ STOP 4
+ endif
+ END
diff --git a/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_2.f b/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_2.f
new file mode 100644
index 00000000000..876f4e09508
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_2.f
@@ -0,0 +1,25 @@
+! { dg-do run }
+! { dg-options "-fdec-non-logical-if -Wconversion-extra" }
+!
+! Allow logical expressions in if statements and blocks
+!
+! Contributed by Francisco Redondo Marchena <francisco.marchema@codethink.co.uk>
+! and Jeff Law <law@redhat.com>
+! Modified by Mark Eggleston <mark.eggleston@codethink.com>
+!
+ PROGRAM logical_exp_if_st_bl
+ INTEGER ipos/1/
+ INTEGER ineg/0/
+
+ ! Test non logical variables
+ if (ineg) STOP 1 ! { dg-warning "if it evaluates to nonzero" }
+ if (0) STOP 2 ! { dg-warning "if it evaluates to nonzero" }
+
+ ! Test non logical expressions in if statements
+ if (MOD(ipos, 1)) STOP 3 ! { dg-warning "if it evaluates to nonzero" }
+
+ ! Test non logical expressions in if blocks
+ if (MOD(2 * ipos, 2)) then ! { dg-warning "if it evaluates to nonzero" }
+ STOP 4
+ endif
+ END
diff --git a/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_3.f b/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_3.f
new file mode 100644
index 00000000000..35cb4c51b8d
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_3.f
@@ -0,0 +1,25 @@
+! { dg-do compile }
+! { dg-options "-fdec -fno-dec-non-logical-if" }
+!
+! Allow logical expressions in if statements and blocks
+!
+! Contributed by Francisco Redondo Marchena <francisco.marchema@codethink.co.uk>
+! and Jeff Law <law@redhat.com>
+! Modified by Mark Eggleston <mark.eggleston@codethink.com>
+!
+ PROGRAM logical_exp_if_st_bl
+ INTEGER ipos/1/
+ INTEGER ineg/0/
+
+ ! Test non logical variables
+ if (ineg) STOP 1 ! { dg-error "IF clause at" }
+ if (0) STOP 2 ! { dg-error "IF clause at" }
+
+ ! Test non logical expressions in if statements
+ if (MOD(ipos, 1)) STOP 3 ! { dg-error "IF clause at" }
+
+ ! Test non logical expressions in if blocks
+ if (MOD(2 * ipos, 2)) then ! { dg-error "IF clause at" }
+ STOP 4
+ endif
+ END
diff --git a/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_4.f b/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_4.f
new file mode 100644
index 00000000000..7b60b60827f
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_4.f
@@ -0,0 +1,45 @@
+! { dg-do run }
+! { dg-options "-fdec -Wconversion-extra" }
+!
+! Contributed by Francisco Redondo Marchena <francisco.marchema@codethink.co.uk>
+! and Jeff Law <law@redhat.com>
+! Modified by Mark Eggleston <mark.eggleston@codethink.com>
+!
+ function othersub1()
+ integer*4 othersub1
+ othersub1 = 9
+ end
+
+ function othersub2()
+ integer*4 othersub2
+ othersub2 = 0
+ end
+
+ program MAIN
+ integer*4 othersub1
+ integer*4 othersub2
+ integer a /1/
+ integer b /2/
+
+ if (othersub1()) then ! { dg-warning "if it evaluates to nonzero" }
+ write(*,*) "OK"
+ else
+ stop 1
+ end if
+ if (othersub2()) then ! { dg-warning "if it evaluates to nonzero" }
+ stop 2
+ else
+ write(*,*) "OK"
+ end if
+ if (a-b) then ! { dg-warning "if it evaluates to nonzero" }
+ write(*,*) "OK"
+ else
+ stop 3
+ end if
+ if (b-(a+1)) then ! { dg-warning "if it evaluates to nonzero" }
+ stop 3
+ else
+ write(*,*) "OK"
+ end if
+ end
+
diff --git a/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_5.f b/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_5.f
new file mode 100644
index 00000000000..80336f48ca1
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_5.f
@@ -0,0 +1,45 @@
+! { dg-do run }
+! { dg-options "-fdec-non-logical-if -Wconversion-extra" }
+!
+! Contributed by Francisco Redondo Marchena <francisco.marchema@codethink.co.uk>
+! and Jeff Law <law@redhat.com>
+! Modified by Mark Eggleston <mark.eggleston@codethink.com>
+!
+ function othersub1()
+ integer*4 othersub1
+ othersub1 = 9
+ end
+
+ function othersub2()
+ integer*4 othersub2
+ othersub2 = 0
+ end
+
+ program MAIN
+ integer*4 othersub1
+ integer*4 othersub2
+ integer a /1/
+ integer b /2/
+
+ if (othersub1()) then ! { dg-warning "Non-LOGICAL type in IF statement" }
+ write(*,*) "OK"
+ else
+ stop 1
+ end if
+ if (othersub2()) then ! { dg-warning "Non-LOGICAL type in IF statement" }
+ stop 2
+ else
+ write(*,*) "OK"
+ end if
+ if (a-b) then ! { dg-warning "Non-LOGICAL type in IF statement" }
+ write(*,*) "OK"
+ else
+ stop 3
+ end if
+ if (b-(a+1)) then ! { dg-warning "Non-LOGICAL type in IF statement" }
+ stop 3
+ else
+ write(*,*) "OK"
+ end if
+ end
+
diff --git a/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_6.f b/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_6.f
new file mode 100644
index 00000000000..e1125ca717a
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/dec_logical_expressions_if_statements_blocks_6.f
@@ -0,0 +1,45 @@
+! { dg-do compile }
+! { dg-options "-fdec -fno-dec-non-logical-if" }
+!
+! Contributed by Francisco Redondo Marchena <francisco.marchema@codethink.co.uk>
+! and Jeff Law <law@redhat.com>
+! Modified by Mark Eggleston <mark.eggleston@codethink.com>
+!
+ function othersub1()
+ integer*4 othersub1
+ othersub1 = 9
+ end
+
+ function othersub2()
+ integer*4 othersub2
+ othersub2 = 0
+ end
+
+ program MAIN
+ integer*4 othersub1
+ integer*4 othersub2
+ integer a /1/
+ integer b /2/
+
+ if (othersub1()) then ! { dg-error "IF clause at" }
+ write(*,*) "OK"
+ else
+ stop 1
+ end if
+ if (othersub2()) then ! { dg-error "IF clause at" }
+ stop 2
+ else
+ write(*,*) "OK"
+ end if
+ if (a-b) then ! { dg-error "IF clause at" }
+ write(*,*) "OK"
+ else
+ stop 3
+ end if
+ if (b-(a+1)) then ! { dg-error "IF clause at" }
+ stop 3
+ else
+ write(*,*) "OK"
+ end if
+ end
+
--
2.27.0