Introduce ternop_cond_operation

This adds class ternop_cond_operation, which implements TERNOP_COND.

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

	* expop.h (class ternop_cond_operation): New.
	* ax-gdb.c (ternop_cond_operation::do_generate_ax): New method.

1 files changed, 31 insertions, 0 deletions

diff --git a/gdb/expop.h b/gdb/expop.h
index 436a011..0f5b504 100644
--- a/gdb/expop.h
+++ b/gdb/expop.h
@@ -734,6 +734,37 @@ public:
   { return TERNOP_SLICE; }
 };
 
+class ternop_cond_operation
+  : public maybe_constant_operation<operation_up, 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
+  {
+    struct value *val
+      = std::get<0> (m_storage)->evaluate (nullptr, exp, noside);
+
+    if (value_logical_not (val))
+      return std::get<2> (m_storage)->evaluate (nullptr, exp, noside);
+    return std::get<1> (m_storage)->evaluate (nullptr, exp, noside);
+  }
+
+  enum exp_opcode opcode () const override
+  { return TERNOP_COND; }
+
+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 */