Implement several Fortran operations

This implements several straightforward Fortran operations, primarily
by reusing existing template classes.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

	* f-lang.c (eval_op_f_abs, eval_op_f_mod, eval_op_f_ceil)
	(eval_op_f_floor, eval_op_f_modulo, eval_op_f_cmplx)
	(eval_op_f_kind): No longer static.  Add "opcode" parameter.
	(evaluate_subexp_f): Update.
	* f-exp.h: New file.

3 files changed, 131 insertions, 14 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 8348230..918a8fc 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,13 @@
 2021-03-08  Tom Tromey  <tom@tromey.com>
 
+	* f-lang.c (eval_op_f_abs, eval_op_f_mod, eval_op_f_ceil)
+	(eval_op_f_floor, eval_op_f_modulo, eval_op_f_cmplx)
+	(eval_op_f_kind): No longer static.  Add "opcode" parameter.
+	(evaluate_subexp_f): Update.
+	* f-exp.h: New file.
+
+2021-03-08  Tom Tromey  <tom@tromey.com>
+
 	* ada-lang.c (ada_ternop_range_operation::evaluate): New method.
 	* ada-exp.h (class ada_ternop_range_operation): New.
 
diff --git a/gdb/f-exp.h b/gdb/f-exp.h
new file mode 100644
index 0000000..4b3fdd4
--- /dev/null
+++ b/gdb/f-exp.h
@@ -0,0 +1,101 @@
+/* Definitions for Fortran expressions
+
+   Copyright (C) 2020 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef FORTRAN_EXP_H
+#define FORTRAN_EXP_H
+
+#include "expop.h"
+
+extern struct value *eval_op_f_abs (struct type *expect_type,
+				    struct expression *exp,
+				    enum noside noside,
+				    enum exp_opcode opcode,
+				    struct value *arg1);
+extern struct value *eval_op_f_mod (struct type *expect_type,
+				    struct expression *exp,
+				    enum noside noside,
+				    enum exp_opcode opcode,
+				    struct value *arg1, struct value *arg2);
+extern struct value *eval_op_f_ceil (struct type *expect_type,
+				     struct expression *exp,
+				     enum noside noside,
+				     enum exp_opcode opcode,
+				     struct value *arg1);
+extern struct value *eval_op_f_floor (struct type *expect_type,
+				      struct expression *exp,
+				      enum noside noside,
+				      enum exp_opcode opcode,
+				      struct value *arg1);
+extern struct value *eval_op_f_modulo (struct type *expect_type,
+				       struct expression *exp,
+				       enum noside noside,
+				       enum exp_opcode opcode,
+				       struct value *arg1, struct value *arg2);
+extern struct value *eval_op_f_cmplx (struct type *expect_type,
+				      struct expression *exp,
+				      enum noside noside,
+				      enum exp_opcode opcode,
+				      struct value *arg1, struct value *arg2);
+extern struct value *eval_op_f_kind (struct type *expect_type,
+				     struct expression *exp,
+				     enum noside noside,
+				     enum exp_opcode opcode,
+				     struct value *arg1);
+
+namespace expr
+{
+
+using fortran_abs_operation = unop_operation<UNOP_ABS, eval_op_f_abs>;
+using fortran_ceil_operation = unop_operation<UNOP_FORTRAN_CEILING,
+					      eval_op_f_ceil>;
+using fortran_floor_operation = unop_operation<UNOP_FORTRAN_FLOOR,
+					       eval_op_f_floor>;
+using fortran_kind_operation = unop_operation<UNOP_FORTRAN_KIND,
+					      eval_op_f_kind>;
+
+using fortran_mod_operation = binop_operation<BINOP_MOD, eval_op_f_mod>;
+using fortran_modulo_operation = binop_operation<BINOP_FORTRAN_MODULO,
+						 eval_op_f_modulo>;
+
+/* The Fortran "complex" operation.  */
+class fortran_cmplx_operation
+  : public tuple_holding_operation<operation_up, operation_up>
+{
+public:
+
+  using tuple_holding_operation::tuple_holding_operation;
+
+  value *evaluate (struct type *expect_type,
+		   struct expression *exp,
+		   enum noside noside) override
+  {
+    value *arg1 = std::get<0> (m_storage)->evaluate (nullptr, exp, noside);
+    value *arg2 = std::get<1> (m_storage)->evaluate (value_type (arg1),
+						     exp, noside);
+    return eval_op_f_cmplx (expect_type, exp, noside, BINOP_FORTRAN_CMPLX,
+			    arg1, arg2);
+  }
+
+  enum exp_opcode opcode () const override
+  { return BINOP_FORTRAN_CMPLX; }
+};
+
+} /* namespace expr */
+
+#endif /* FORTRAN_EXP_H */
diff --git a/gdb/f-lang.c b/gdb/f-lang.c
index 1fb4e63..28c483f 100644
--- a/gdb/f-lang.c
+++ b/gdb/f-lang.c
@@ -38,6 +38,7 @@
 #include "gdbarch.h"
 #include "gdbcmd.h"
 #include "f-array-walker.h"
+#include "f-exp.h"
 
 #include <math.h>
 
@@ -993,9 +994,10 @@ fortran_associated (struct gdbarch *gdbarch, const language_defn *lang,
 
 /* A helper function for UNOP_ABS.  */
 
-static struct value *
+struct value *
 eval_op_f_abs (struct type *expect_type, struct expression *exp,
 	       enum noside noside,
+	       enum exp_opcode opcode,
 	       struct value *arg1)
 {
   if (noside == EVAL_SKIP)
@@ -1022,9 +1024,10 @@ eval_op_f_abs (struct type *expect_type, struct expression *exp,
 
 /* A helper function for BINOP_MOD.  */
 
-static struct value *
+struct value *
 eval_op_f_mod (struct type *expect_type, struct expression *exp,
 	       enum noside noside,
+	       enum exp_opcode opcode,
 	       struct value *arg1, struct value *arg2)
 {
   if (noside == EVAL_SKIP)
@@ -1060,9 +1063,10 @@ eval_op_f_mod (struct type *expect_type, struct expression *exp,
 
 /* A helper function for UNOP_FORTRAN_CEILING.  */
 
-static struct value *
+struct value *
 eval_op_f_ceil (struct type *expect_type, struct expression *exp,
 		enum noside noside,
+		enum exp_opcode opcode,
 		struct value *arg1)
 {
   if (noside == EVAL_SKIP)
@@ -1079,9 +1083,10 @@ eval_op_f_ceil (struct type *expect_type, struct expression *exp,
 
 /* A helper function for UNOP_FORTRAN_FLOOR.  */
 
-static struct value *
+struct value *
 eval_op_f_floor (struct type *expect_type, struct expression *exp,
 		 enum noside noside,
+		 enum exp_opcode opcode,
 		 struct value *arg1)
 {
   if (noside == EVAL_SKIP)
@@ -1098,9 +1103,10 @@ eval_op_f_floor (struct type *expect_type, struct expression *exp,
 
 /* A helper function for BINOP_FORTRAN_MODULO.  */
 
-static struct value *
+struct value *
 eval_op_f_modulo (struct type *expect_type, struct expression *exp,
 		  enum noside noside,
+		  enum exp_opcode opcode,
 		  struct value *arg1, struct value *arg2)
 {
   if (noside == EVAL_SKIP)
@@ -1139,9 +1145,10 @@ eval_op_f_modulo (struct type *expect_type, struct expression *exp,
 
 /* A helper function for BINOP_FORTRAN_CMPLX.  */
 
-static struct value *
+struct value *
 eval_op_f_cmplx (struct type *expect_type, struct expression *exp,
 		 enum noside noside,
+		 enum exp_opcode opcode,
 		 struct value *arg1, struct value *arg2)
 {
   if (noside == EVAL_SKIP)
@@ -1152,9 +1159,10 @@ eval_op_f_cmplx (struct type *expect_type, struct expression *exp,
 
 /* A helper function for UNOP_FORTRAN_KIND.  */
 
-static struct value *
+struct value *
 eval_op_f_kind (struct type *expect_type, struct expression *exp,
 		enum noside noside,
+		enum exp_opcode opcode,
 		struct value *arg1)
 {
   struct type *type = value_type (arg1);
@@ -1214,20 +1222,20 @@ evaluate_subexp_f (struct type *expect_type, struct expression *exp,
 
     case UNOP_ABS:
       arg1 = evaluate_subexp (nullptr, exp, pos, noside);
-      return eval_op_f_abs (expect_type, exp, noside, arg1);
+      return eval_op_f_abs (expect_type, exp, noside, op, arg1);
 
     case BINOP_MOD:
       arg1 = evaluate_subexp (nullptr, exp, pos, noside);
       arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
-      return eval_op_f_mod (expect_type, exp, noside, arg1, arg2);
+      return eval_op_f_mod (expect_type, exp, noside, op, arg1, arg2);
 
     case UNOP_FORTRAN_CEILING:
       arg1 = evaluate_subexp (nullptr, exp, pos, noside);
-      return eval_op_f_ceil (expect_type, exp, noside, arg1);
+      return eval_op_f_ceil (expect_type, exp, noside, op, arg1);
 
     case UNOP_FORTRAN_FLOOR:
       arg1 = evaluate_subexp (nullptr, exp, pos, noside);
-      return eval_op_f_floor (expect_type, exp, noside, arg1);
+      return eval_op_f_floor (expect_type, exp, noside, op, arg1);
 
     case UNOP_FORTRAN_ALLOCATED:
       {
@@ -1240,7 +1248,7 @@ evaluate_subexp_f (struct type *expect_type, struct expression *exp,
     case BINOP_FORTRAN_MODULO:
       arg1 = evaluate_subexp (nullptr, exp, pos, noside);
       arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
-      return eval_op_f_modulo (expect_type, exp, noside, arg1, arg2);
+      return eval_op_f_modulo (expect_type, exp, noside, op, arg1, arg2);
 
     case FORTRAN_LBOUND:
     case FORTRAN_UBOUND:
@@ -1305,11 +1313,11 @@ evaluate_subexp_f (struct type *expect_type, struct expression *exp,
     case BINOP_FORTRAN_CMPLX:
       arg1 = evaluate_subexp (nullptr, exp, pos, noside);
       arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside);
-      return eval_op_f_cmplx (expect_type, exp, noside, arg1, arg2);
+      return eval_op_f_cmplx (expect_type, exp, noside, op, arg1, arg2);
 
     case UNOP_FORTRAN_KIND:
       arg1 = evaluate_subexp (NULL, exp, pos, EVAL_AVOID_SIDE_EFFECTS);
-      return eval_op_f_kind (expect_type, exp, noside, arg1);
+      return eval_op_f_kind (expect_type, exp, noside, op, arg1);
 
     case OP_F77_UNDETERMINED_ARGLIST:
       /* Remember that in F77, functions, substring ops and array subscript