[v3,077/206] Introduce float_const_operation

Message ID 20210220201609.838264-78-tom@tromey.com
State New
Headers show
Series
  • Refactor expressions
Related show

Commit Message

Tom Tromey Feb. 20, 2021, 8:14 p.m.
This adds class float_const_operation, an operation holding a
floating-point constant.  Unlike most other new operations, this one
requires a custom 'dump' method.

gdb/ChangeLog
2021-02-20  Tom Tromey  <tom@tromey.com>

	* expprint.c (float_const_operation::dump): New method.
	* expop.h (float_data): New typedef.
	(class float_const_operation): New.
---
 gdb/ChangeLog  |  6 ++++++
 gdb/expop.h    | 42 ++++++++++++++++++++++++++++++++++++++++++
 gdb/expprint.c |  8 ++++++++
 3 files changed, 56 insertions(+)

-- 
2.26.2

Patch

diff --git a/gdb/expop.h b/gdb/expop.h
index 1bf06139dfb..1e58262e876 100644
--- a/gdb/expop.h
+++ b/gdb/expop.h
@@ -373,6 +373,48 @@  class maybe_constant_operation
   }
 };
 
+/* A floating-point constant.  The constant is encoded in the target
+   format.  */
+
+typedef std::array<gdb_byte, 16> float_data;
+
+/* An operation that holds a floating-point constant of a given
+   type.
+
+   This does not need the facilities provided by
+   tuple_holding_operation, so it does not use it.  */
+class float_const_operation
+  : public operation
+{
+public:
+
+  float_const_operation (struct type *type, float_data data)
+    : m_type (type),
+      m_data (data)
+  {
+  }
+
+  value *evaluate (struct type *expect_type,
+		   struct expression *exp,
+		   enum noside noside) override
+  {
+    return value_from_contents (m_type, m_data.data ());
+  }
+
+  enum exp_opcode opcode () const override
+  { return OP_FLOAT; }
+
+  bool constant_p () const override
+  { return true; }
+
+  void dump (struct ui_file *stream, int depth) const override;
+
+private:
+
+  struct type *m_type;
+  float_data m_data;
+};
+
 } /* namespace expr */
 
 #endif /* EXPOP_H */
diff --git a/gdb/expprint.c b/gdb/expprint.c
index 92f12999472..5826108c1c9 100644
--- a/gdb/expprint.c
+++ b/gdb/expprint.c
@@ -1283,4 +1283,12 @@  dump_for_expression (struct ui_file *stream, int depth,
   fprintf_filtered (stream, "\n");
 }
 
+void
+float_const_operation::dump (struct ui_file *stream, int depth) const
+{
+  fprintf_filtered (stream, _("%*sFloat: "), depth, "");
+  print_floating (m_data.data (), m_type, stream);
+  fprintf_filtered (stream, "\n");
+}
+
 } /* namespace expr */