[120/203] Introduce unop_cast_type_operation

Message ID 20210101214723.1784144-121-tom@tromey.com
State Superseded
Headers show
Series
  • Refactor expressions
Related show

Commit Message

Tom Tromey Jan. 1, 2021, 9:46 p.m.
This adds class unop_cast_type_operation, which implements
UNOP_CAST_TYPE.

gdb/ChangeLog
2021-01-01  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(+)

-- 
2.26.2

Patch

diff --git a/gdb/ax-gdb.c b/gdb/ax-gdb.c
index 84887da524f..e0970e87d68 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 664812aec19..9102f2bb66d 100644
--- a/gdb/expop.h
+++ b/gdb/expop.h
@@ -1853,6 +1853,37 @@  class unop_cast_operation
     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 */