From 786869fd62813e80da9b6545a295d53c36275c19 Mon Sep 17 00:00:00 2001

From: Mark Eggleston <markeggleston@gcc.gnu.org>

Date: Fri, 22 Jan 2021 13:12:14 +0000

Subject: [PATCH 06/10] Allow string length and kind to be specified on a per

 variable basis.

This allows kind/length to be mixed with array specification in

declarations.

e.g.

      INTEGER*4 x*2, y*8

      CHARACTER names*20(10)

      REAL v(100)*8, vv*4(50)

The per-variable size overrides the kind or length specified for the type.

Use -fdec-override-kind to enable. Also enabled by -fdec.

Note: this feature is a merger of two previously separate features.

Now accepts named constants as kind parameters:

      INTEGER A

      PARAMETER (A=2)

      INTEGER B*(A)

Contributed by Mark Eggleston <mark.eggleston@codethink.com>

Now rejects invalid kind parameters and prints error messages:

      INTEGER X*3

caused an internal compiler error.

Contributed by Mark Eggleston <mark.eggleston@codethink.com>

---

 gcc/fortran/decl.cc                           | 156 ++++++++++++++----

 gcc/fortran/lang.opt                          |   4 +

 gcc/fortran/options.cc                        |   1 +

 .../dec_mixed_char_array_declaration_1.f      |  13 ++

 .../dec_mixed_char_array_declaration_2.f      |  13 ++

 .../dec_mixed_char_array_declaration_3.f      |  13 ++

 .../gfortran.dg/dec_spec_in_variable_1.f      |  31 ++++

 .../gfortran.dg/dec_spec_in_variable_2.f      |  31 ++++

 .../gfortran.dg/dec_spec_in_variable_3.f      |  31 ++++

 .../gfortran.dg/dec_spec_in_variable_4.f      |  14 ++

 .../gfortran.dg/dec_spec_in_variable_5.f      |  19 +++

 .../gfortran.dg/dec_spec_in_variable_6.f      |  19 +++

 .../gfortran.dg/dec_spec_in_variable_7.f      |  15 ++

 .../gfortran.dg/dec_spec_in_variable_8.f      |  14 ++

 14 files changed, 340 insertions(+), 34 deletions(-)

 create mode 100644 gcc/testsuite/gfortran.dg/dec_mixed_char_array_declaration_1.f

 create mode 100644 gcc/testsuite/gfortran.dg/dec_mixed_char_array_declaration_2.f

 create mode 100644 gcc/testsuite/gfortran.dg/dec_mixed_char_array_declaration_3.f

 create mode 100644 gcc/testsuite/gfortran.dg/dec_spec_in_variable_1.f

 create mode 100644 gcc/testsuite/gfortran.dg/dec_spec_in_variable_2.f

 create mode 100644 gcc/testsuite/gfortran.dg/dec_spec_in_variable_3.f

 create mode 100644 gcc/testsuite/gfortran.dg/dec_spec_in_variable_4.f

 create mode 100644 gcc/testsuite/gfortran.dg/dec_spec_in_variable_5.f

 create mode 100644 gcc/testsuite/gfortran.dg/dec_spec_in_variable_6.f

 create mode 100644 gcc/testsuite/gfortran.dg/dec_spec_in_variable_7.f

 create mode 100644 gcc/testsuite/gfortran.dg/dec_spec_in_variable_8.f

diff --git a/gcc/fortran/decl.cc b/gcc/fortran/decl.cc

index 5c8c1b7981b..f7dc9d8263d 100644

--- a/gcc/fortran/decl.cc

+++ b/gcc/fortran/decl.cc

@@ -1213,6 +1213,54 @@ syntax:

   return MATCH_ERROR;

 }

+/* This matches the nonstandard kind given after a variable name, like:

+   INTEGER x*2, y*4

+   The per-variable kind will override any kind given in the type

+   declaration.

+*/

+

+static match

+match_per_symbol_kind (int *length)

+{

+  match m;

+  gfc_expr *expr = NULL;

+

+  m = gfc_match_char ('*');

+  if (m != MATCH_YES)

+    return m;

+

+  m = gfc_match_small_literal_int (length, NULL);

+  if (m == MATCH_YES || m == MATCH_ERROR)

+    return m;

+

+  if (gfc_match_char ('(') == MATCH_NO)

+    return MATCH_ERROR;

+

+  m = gfc_match_expr (&expr;;

+  if (m == MATCH_YES)

+    {

+      m = MATCH_ERROR; // Assume error

+      if (gfc_expr_check_typed (expr, gfc_current_ns, false))

+	{

+	  if ((expr->expr_type == EXPR_CONSTANT)

+	      && (expr->ts.type == BT_INTEGER))

+	    {

+	      *length = mpz_get_si(expr->value.integer);

+	      m = MATCH_YES;

+	    }

+	}

+

+	if (m == MATCH_YES)

+	  {

+	    if (gfc_match_char (')') == MATCH_NO)

+	       m = MATCH_ERROR;

+  }

+     }

+

+  if (expr != NULL)

+     gfc_free_expr (expr);

+  return m;

+}

 /* Special subroutine for finding a symbol.  Check if the name is found

    in the current name space.  If not, and we're compiling a function or

@@ -2443,6 +2491,35 @@ check_function_name (char *name)

 }

+static match

+match_character_length_clause (gfc_charlen **cl, bool *cl_deferred, int elem)

+{

+  gfc_expr* char_len;

+  char_len = NULL;

+

+  match m = match_char_length (&char_len, cl_deferred, false);

+  if (m == MATCH_YES)

+    {

+      *cl = gfc_new_charlen (gfc_current_ns, NULL);

+      (*cl)->length = char_len;

+    }

+  else if (m == MATCH_NO)

+    {

+      if (elem > 1

+	  && (current_ts.u.cl->length == NULL

+	      || current_ts.u.cl->length->expr_type != EXPR_CONSTANT))

+	{

+	  *cl = gfc_new_charlen (gfc_current_ns, NULL);

+	  (*cl)->length = gfc_copy_expr (current_ts.u.cl->length);

+	}

+      else

+      *cl = current_ts.u.cl;

+

+      *cl_deferred = current_ts.deferred;

+    }

+  return m;

+}

+

 /* Match a variable name with an optional initializer.  When this

    subroutine is called, a variable is expected to be parsed next.

    Depending on what is happening at the moment, updates either the

@@ -2453,7 +2530,7 @@ variable_decl (int elem)

 {

   char name[GFC_MAX_SYMBOL_LEN + 1];

   static unsigned int fill_id = 0;

-  gfc_expr *initializer, *char_len;

+  gfc_expr *initializer;

   gfc_array_spec *as;

   gfc_array_spec *cp_as; /* Extra copy for Cray Pointees.  */

   gfc_charlen *cl;

@@ -2462,11 +2539,15 @@ variable_decl (int elem)

   match m;

   bool t;

   gfc_symbol *sym;

+  match cl_match;

+  match kind_match;

+  int overridden_kind;

   char c;

   initializer = NULL;

   as = NULL;

   cp_as = NULL;

+  kind_match = MATCH_NO;

   /* When we get here, we've just matched a list of attributes and

      maybe a type and a double colon.  The next thing we expect to see

@@ -2519,6 +2600,28 @@ variable_decl (int elem)

   var_locus = gfc_current_locus;

+

+  cl = NULL;

+  cl_deferred = false;

+  cl_match = MATCH_NO;

+

+  /* Check for a character length clause before an array clause */

+  if (flag_dec_override_kind)

+    {

+      if (current_ts.type == BT_CHARACTER)

+	{

+	  cl_match = match_character_length_clause (&cl, &cl_deferred, elem);

+	  if (cl_match == MATCH_ERROR)

+	    goto cleanup;

+	}

+      else

+	{

+	  kind_match = match_per_symbol_kind (&overridden_kind);

+	  if (kind_match == MATCH_ERROR)

+	    goto cleanup;

+	}

+    }

+

   /* Now we could see the optional array spec. or character length.  */

   m = gfc_match_array_spec (&as, true, true);

   if (m == MATCH_ERROR)

@@ -2667,40 +2770,12 @@ variable_decl (int elem)

 	}

     }

-  char_len = NULL;

-  cl = NULL;

-  cl_deferred = false;

-

-  if (current_ts.type == BT_CHARACTER)

+  /* Second chance for a character length clause */

+  if (cl_match == MATCH_NO && current_ts.type == BT_CHARACTER)

     {

-      switch (match_char_length (&char_len, &cl_deferred, false))

-	{

-	case MATCH_YES:

-	  cl = gfc_new_charlen (gfc_current_ns, NULL);

-

-	  cl->length = char_len;

-	  break;

-

-	/* Non-constant lengths need to be copied after the first

-	   element.  Also copy assumed lengths.  */

-	case MATCH_NO:

-	  if (elem > 1

-	      && (current_ts.u.cl->length == NULL

-		  || current_ts.u.cl->length->expr_type != EXPR_CONSTANT))

-	    {

-	      cl = gfc_new_charlen (gfc_current_ns, NULL);

-	      cl->length = gfc_copy_expr (current_ts.u.cl->length);

-	    }

-	  else

-	    cl = current_ts.u.cl;

-

-	  cl_deferred = current_ts.deferred;

-

-	  break;

-

-	case MATCH_ERROR:

-	  goto cleanup;

-	}

+      m = match_character_length_clause (&cl, &cl_deferred, elem);

+      if (m == MATCH_ERROR)

+	goto cleanup;

     }

   /* The dummy arguments and result of the abreviated form of MODULE

@@ -2802,6 +2877,19 @@ variable_decl (int elem)

       goto cleanup;

     }

+  if (kind_match == MATCH_YES)

+    {

+      gfc_find_symbol (name, gfc_current_ns, 1, &sym);

+      /* sym *must* be found at this point */

+      sym->ts.kind = overridden_kind;

+      if (gfc_validate_kind (sym->ts.type, sym->ts.kind, true) < 0)

+	{

+	  gfc_error ("Kind %d not supported for type %s at %C",

+		     sym->ts.kind, gfc_basic_typename (sym->ts.type));

+	  return MATCH_ERROR;

+	}

+    }

+

   if (!check_function_name (name))

     {

       m = MATCH_ERROR;

diff --git a/gcc/fortran/lang.opt b/gcc/fortran/lang.opt

index 25cc948699b..4a269ebb22d 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-override-kind

+Fortran Var(flag_dec_override_kind)

+Enable support for per variable kind specification.

+

 fdec-structure

 Fortran Var(flag_dec_structure)

 Enable support for DEC STRUCTURE/RECORD.

diff --git a/gcc/fortran/options.cc b/gcc/fortran/options.cc

index d6bd36c3a8a..edbab483b36 100644

--- a/gcc/fortran/options.cc

+++ b/gcc/fortran/options.cc

@@ -78,6 +78,7 @@ set_dec_flags (int value)

   SET_BITFLAG (flag_dec_blank_format_item, value, value);

   SET_BITFLAG (flag_dec_char_conversions, value, value);

   SET_BITFLAG (flag_dec_duplicates, value, value);

+  SET_BITFLAG (flag_dec_override_kind, value, value);

 }

 /* Finalize DEC flags.  */

diff --git a/gcc/testsuite/gfortran.dg/dec_mixed_char_array_declaration_1.f b/gcc/testsuite/gfortran.dg/dec_mixed_char_array_declaration_1.f

new file mode 100644

index 00000000000..706ea4112a4

--- /dev/null

+++ b/gcc/testsuite/gfortran.dg/dec_mixed_char_array_declaration_1.f

@@ -0,0 +1,13 @@

+! { dg-do run }

+! { dg-options "-fdec" }

+!

+! Test character declaration with mixed string length and array specification

+!

+! Contributed by Jim MacArthur <jim.macarthur@codethink.co.uk>

+! Modified by Mark Eggleston <mark.eggleston@codethink.com>

+!

+       PROGRAM character_declaration

+          CHARACTER ASPEC_SLENGTH*2 (5) /'01','02','03','04','05'/

+          CHARACTER SLENGTH_ASPEC(5)*2 /'01','02','03','04','05'/

+          if (ASPEC_SLENGTH(3).NE.SLENGTH_ASPEC(3)) STOP 1

+        END

diff --git a/gcc/testsuite/gfortran.dg/dec_mixed_char_array_declaration_2.f b/gcc/testsuite/gfortran.dg/dec_mixed_char_array_declaration_2.f

new file mode 100644

index 00000000000..26d2acf01de

--- /dev/null

+++ b/gcc/testsuite/gfortran.dg/dec_mixed_char_array_declaration_2.f

@@ -0,0 +1,13 @@

+! { dg-do run }

+! { dg-options "-fdec-override-kind" }

+!

+! Test character declaration with mixed string length and array specification

+!

+! Contributed by Jim MacArthur <jim.macarthur@codethink.co.uk>

+! Modified by Mark Eggleston <mark.eggleston@codethink.com>

+!

+        PROGRAM character_declaration

+          CHARACTER ASPEC_SLENGTH*2 (5) /'01','02','03','04','05'/

+          CHARACTER SLENGTH_ASPEC(5)*2 /'01','02','03','04','05'/

+          if (ASPEC_SLENGTH(3).NE.SLENGTH_ASPEC(3)) STOP 1

+        END

diff --git a/gcc/testsuite/gfortran.dg/dec_mixed_char_array_declaration_3.f b/gcc/testsuite/gfortran.dg/dec_mixed_char_array_declaration_3.f

new file mode 100644

index 00000000000..76e4f0bdb93

--- /dev/null

+++ b/gcc/testsuite/gfortran.dg/dec_mixed_char_array_declaration_3.f

@@ -0,0 +1,13 @@

+! { dg-do compile }

+! { dg-options "-fdec-override-kind -fno-dec-override-kind" }

+!

+! Test character declaration with mixed string length and array specification

+!

+! Contributed by Jim MacArthur <jim.macarthur@codethink.co.uk>

+! Modified by Mark Eggleston <mark.eggleston@codethink.com>

+!

+        PROGRAM character_declaration

+          CHARACTER ASPEC_SLENGTH*2 (5) /'01','02','03','04','05'/ ! { dg-error "Syntax error" }

+          CHARACTER SLENGTH_ASPEC(5)*2 /'01','02','03','04','05'/

+          if (ASPEC_SLENGTH(3).NE.SLENGTH_ASPEC(3)) STOP 1 ! { dg-error " Operands of comparison operator" }

+        END

diff --git a/gcc/testsuite/gfortran.dg/dec_spec_in_variable_1.f b/gcc/testsuite/gfortran.dg/dec_spec_in_variable_1.f

new file mode 100644

index 00000000000..edd0f5874b7

--- /dev/null

+++ b/gcc/testsuite/gfortran.dg/dec_spec_in_variable_1.f

@@ -0,0 +1,31 @@

+! { dg-do run }

+! { dg-options "-fdec" }

+!

+! Test kind specification in variable not in type

+!

+! Contributed by Mark Eggleston <mark.eggleston@codethink.com>

+!

+        program spec_in_var

+          integer*8  ai*1, bi*4, ci

+          real*4 ar*4, br*8, cr

+

+          ai = 1

+          ar = 1.0

+          bi = 2

+          br = 2.0

+          ci = 3

+          cr = 3.0

+

+          if (ai .ne. 1) stop 1

+          if (abs(ar - 1.0) > 1.0D-6) stop 2

+          if (bi .ne. 2) stop 3

+          if (abs(br - 2.0) > 1.0D-6) stop 4

+          if (ci .ne. 3) stop 5

+          if (abs(cr - 3.0) > 1.0D-6) stop 6

+          if (kind(ai) .ne. 1) stop 7

+          if (kind(ar) .ne. 4) stop 8

+          if (kind(bi) .ne. 4) stop 9

+          if (kind(br) .ne. 8) stop 10

+          if (kind(ci) .ne. 8) stop 11

+          if (kind(cr) .ne. 4) stop 12

+        end

diff --git a/gcc/testsuite/gfortran.dg/dec_spec_in_variable_2.f b/gcc/testsuite/gfortran.dg/dec_spec_in_variable_2.f

new file mode 100644

index 00000000000..bfaba584dbb

--- /dev/null

+++ b/gcc/testsuite/gfortran.dg/dec_spec_in_variable_2.f

@@ -0,0 +1,31 @@

+! { dg-do run }

+! { dg-options "-fdec-override-kind" }

+!

+! Test kind specification in variable not in type

+!

+! Contributed by Mark Eggleston <mark.eggleston@codethink.com>

+!

+        program spec_in_var

+          integer*8  ai*1, bi*4, ci

+          real*4 ar*4, br*8, cr

+

+          ai = 1

+          ar = 1.0

+          bi = 2

+          br = 2.0

+          ci = 3

+          cr = 3.0

+

+          if (ai .ne. 1) stop 1

+          if (abs(ar - 1.0) > 1.0D-6) stop 2

+          if (bi .ne. 2) stop 3

+          if (abs(br - 2.0) > 1.0D-6) stop 4

+          if (ci .ne. 3) stop 5

+          if (abs(cr - 3.0) > 1.0D-6) stop 6

+          if (kind(ai) .ne. 1) stop 7

+          if (kind(ar) .ne. 4) stop 8

+          if (kind(bi) .ne. 4) stop 9

+          if (kind(br) .ne. 8) stop 10

+          if (kind(ci) .ne. 8) stop 11

+          if (kind(cr) .ne. 4) stop 12

+        end

diff --git a/gcc/testsuite/gfortran.dg/dec_spec_in_variable_3.f b/gcc/testsuite/gfortran.dg/dec_spec_in_variable_3.f

new file mode 100644

index 00000000000..5ff434e7466

--- /dev/null

+++ b/gcc/testsuite/gfortran.dg/dec_spec_in_variable_3.f

@@ -0,0 +1,31 @@

+! { dg-do compile }

+! { dg-options "-fdec -fno-dec-override-kind" }

+!

+! Test kind specification in variable not in type

+!

+! Contributed by Mark Eggleston <mark.eggleston@codethink.com>

+!

+        program spec_in_var

+          integer*8  ai*1, bi*4, ci ! { dg-error "Syntax error" }

+          real*4 ar*4, br*8, cr ! { dg-error "Syntax error" }

+

+          ai = 1

+          ar = 1.0

+          bi = 2

+          br = 2.0

+          ci = 3

+          cr = 3.0

+

+          if (ai .ne. 1) stop 1

+          if (abs(ar - 1.0) > 1.0D-6) stop 2

+          if (bi .ne. 2) stop 3

+          if (abs(br - 2.0) > 1.0D-6) stop 4

+          if (ci .ne. 3) stop 5

+          if (abs(cr - 3.0) > 1.0D-6) stop 6

+          if (kind(ai) .ne. 1) stop 7

+          if (kind(ar) .ne. 4) stop 8

+          if (kind(bi) .ne. 4) stop 9

+          if (kind(br) .ne. 8) stop 10

+          if (kind(ci) .ne. 8) stop 11

+          if (kind(cr) .ne. 4) stop 12

+        end

diff --git a/gcc/testsuite/gfortran.dg/dec_spec_in_variable_4.f b/gcc/testsuite/gfortran.dg/dec_spec_in_variable_4.f

new file mode 100644

index 00000000000..c01980e8b9d

--- /dev/null

+++ b/gcc/testsuite/gfortran.dg/dec_spec_in_variable_4.f

@@ -0,0 +1,14 @@

+! { dg-do compile }

+!

+! Test kind specification in variable not in type. The per variable

+! kind specification is not enabled so these should fail

+!

+! Contributed by Mark Eggleston <mark.eggleston@codethink.com>

+!

+        program spec_in_var

+          integer a

+          parameter(a=2)

+          integer b*(a) ! { dg-error "Syntax error" }

+          real c*(8)    ! { dg-error "Syntax error" }

+          logical d*1_1 ! { dg-error "Syntax error" }

+        end

diff --git a/gcc/testsuite/gfortran.dg/dec_spec_in_variable_5.f b/gcc/testsuite/gfortran.dg/dec_spec_in_variable_5.f

new file mode 100644

index 00000000000..e2f39da3f4f

--- /dev/null

+++ b/gcc/testsuite/gfortran.dg/dec_spec_in_variable_5.f

@@ -0,0 +1,19 @@

+! { dg-do run }

+! { dg-options "-fdec-override-kind" }

+!

+! Test kind specification in variable not in type

+!

+! Contributed by Mark Eggleston <mark.eggleston@codethink.com>

+!

+        program spec_in_var

+          integer a

+          parameter(a=2)

+          integer b*(a)

+          real c*(8)

+          logical d*(1_1)

+          character e*(a)

+          if (kind(b).ne.2) stop 1

+          if (kind(c).ne.8) stop 2

+          if (kind(d).ne.1) stop 3

+          if (len(e).ne.2) stop 4

+        end

diff --git a/gcc/testsuite/gfortran.dg/dec_spec_in_variable_6.f b/gcc/testsuite/gfortran.dg/dec_spec_in_variable_6.f

new file mode 100644

index 00000000000..569747874e3

--- /dev/null

+++ b/gcc/testsuite/gfortran.dg/dec_spec_in_variable_6.f

@@ -0,0 +1,19 @@

+! { dg-do run }

+! { dg-options "-fdec" }

+!

+! Test kind specification in variable not in type

+!

+! Contributed by Mark Eggleston <mark.eggleston@codethink.com>

+!

+        program spec_in_var

+          integer a

+          parameter(a=2)

+          integer b*(a)

+          real c*(8)

+          logical d*(1_1)

+          character e*(a)

+          if (kind(b).ne.2) stop 1

+          if (kind(c).ne.8) stop 2

+          if (kind(d).ne.1) stop 3

+          if (len(e).ne.2) stop 4

+        end

diff --git a/gcc/testsuite/gfortran.dg/dec_spec_in_variable_7.f b/gcc/testsuite/gfortran.dg/dec_spec_in_variable_7.f

new file mode 100644

index 00000000000..b975bfd15c5

--- /dev/null

+++ b/gcc/testsuite/gfortran.dg/dec_spec_in_variable_7.f

@@ -0,0 +1,15 @@

+! { dg-do compile }

+! { dg-options "-fdec -fno-dec-override-kind" }

+!

+! Test kind specification in variable not in type as the per variable

+! kind specification is not enables these should fail

+!

+! Contributed by Mark Eggleston <mark.eggleston@codethink.com>

+!

+        program spec_in_var

+          integer a

+          parameter(a=2)

+          integer b*(a) ! { dg-error "Syntax error" }

+          real c*(8)    ! { dg-error "Syntax error" }

+          logical d*1_1 ! { dg-error "Syntax error" }

+        end

diff --git a/gcc/testsuite/gfortran.dg/dec_spec_in_variable_8.f b/gcc/testsuite/gfortran.dg/dec_spec_in_variable_8.f

new file mode 100644

index 00000000000..85732e0bd85

--- /dev/null

+++ b/gcc/testsuite/gfortran.dg/dec_spec_in_variable_8.f

@@ -0,0 +1,14 @@

+! { dg-do compile }

+! { dg-options "-fdec" }

+!

+! Check that invalid kind values are rejected.

+!

+! Contributed by Mark Eggleston <mark.eggleston@codethink.com>

+!

+        program spec_in_var

+          integer a

+          parameter(a=3)

+          integer b*(a) ! { dg-error "Kind 3 not supported" }

+          real c*(78)   ! { dg-error "Kind 78 not supported" }

+          logical d*(*) ! { dg-error "Invalid character" }

+        end

-- 

2.27.0