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