From 292382f47ef08c5ec3292c612f737fe4b312c9f1 Mon Sep 17 00:00:00 2001
From: Tom Tromey <tom@tromey.com>
Date: Mon, 8 Mar 2021 07:27:57 -0700
Subject: Introduce unop_cast_type_operation

This adds class unop_cast_type_operation, which implements
UNOP_CAST_TYPE.

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

	* expop.h (class unop_cast_type_operation): New.
	* ax-gdb.c (unop_cast_type_operation::do_generate_ax): New
	method.
---
 gdb/ChangeLog |  6 ++++++
 gdb/ax-gdb.c  | 12 ++++++++++++
 gdb/expop.h   | 31 +++++++++++++++++++++++++++++++
 3 files changed, 49 insertions(+)

(limited to 'gdb')

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 8d1bbf0..609e91f 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,11 @@
 2021-03-08  Tom Tromey  <tom@tromey.com>
 
+	* expop.h (class unop_cast_type_operation): New.
+	* ax-gdb.c (unop_cast_type_operation::do_generate_ax): New
+	method.
+
+2021-03-08  Tom Tromey  <tom@tromey.com>
+
 	* expop.h (class unop_cast_operation): New.
 	* ax-gdb.c (unop_cast_operation::do_generate_ax): New method.
 
diff --git a/gdb/ax-gdb.c b/gdb/ax-gdb.c
index 84887da..e0970e8 100644
--- a/gdb/ax-gdb.c
+++ b/gdb/ax-gdb.c
@@ -2661,6 +2661,18 @@ assign_modify_operation::do_generate_ax (struct expression *exp,
 	     "may not assign to it"), name);
 }
 
+void
+unop_cast_type_operation::do_generate_ax (struct expression *exp,
+					  struct agent_expr *ax,
+					  struct axs_value *value,
+					  struct type *cast_type)
+{
+  struct value *val
+    = std::get<0> (m_storage)->evaluate (nullptr, exp,
+					 EVAL_AVOID_SIDE_EFFECTS);
+  std::get<1> (m_storage)->generate_ax (exp, ax, value, value_type (val));
+}
+
 }
 
 /* This handles the middle-to-right-side of code generation for binary
diff --git a/gdb/expop.h b/gdb/expop.h
index abd5f64..1d1ce0b 100644
--- a/gdb/expop.h
+++ b/gdb/expop.h
@@ -1864,6 +1864,37 @@ protected:
     override;
 };
 
+/* A cast, but the type comes from an expression, not a "struct
+   type".  */
+class unop_cast_type_operation
+  : public maybe_constant_operation<operation_up, operation_up>
+{
+public:
+
+  using maybe_constant_operation::maybe_constant_operation;
+
+  value *evaluate (struct type *expect_type,
+		   struct expression *exp,
+		   enum noside noside) override
+  {
+    value *val = std::get<0> (m_storage)->evaluate (nullptr, exp,
+						    EVAL_AVOID_SIDE_EFFECTS);
+    return std::get<1> (m_storage)->evaluate_for_cast (value_type (val),
+						       exp, noside);
+  }
+
+  enum exp_opcode opcode () const override
+  { return UNOP_CAST_TYPE; }
+
+protected:
+
+  void do_generate_ax (struct expression *exp,
+		       struct agent_expr *ax,
+		       struct axs_value *value,
+		       struct type *cast_type)
+    override;
+};
+
 } /* namespace expr */
 
 #endif /* EXPOP_H */
-- 
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