[PATCH 1/3] abg-ir.cc: Tidy some operator== definitions

[Giuliano Procida <gprocida@google.com>]

Many of the operator== definitions in this source file follow the same
pattern:

- the address of the argument is dynamic_cast to type of 'this'
- naked canonical type pointers are compared, if both present
- the types are compared structurally with 'equals'

In a couple of cases extra work is done to fetch the canonical type
of the definition of a declaration.

This commit adjusts a few cases so they more closely follow the common
form. This is to make the next refactoring trivial.

There are no behavioural changes.

	* src/abg-irc.cc (scope_type_decl::operator==): Compare naked
	canonical type pointers instead of the shared pointers.
	(qualified_type_def::operator==): Remove excess blank line.
	(function_type::operator==): Do dynamic_cast and check of
	argument before comparing naked canonical type pointers.
	(class_or_union::operator==): Eliminate temporary reference.
	(class_decl::operator==): Likewise.
	(union_decl::operator==): Likewise.

Signed-off-by: Giuliano Procida <gprocida@google.com>
---
 src/abg-ir.cc | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/src/abg-ir.cc b/src/abg-ir.cc
index 37f6bbdf..41e2f00e 100644
--- a/src/abg-ir.cc
+++ b/src/abg-ir.cc
@@ -12872,8 +12872,8 @@ scope_type_decl::operator==(const decl_base& o) const
   if (!other)
     return false;
 
-  if (get_canonical_type() && other->get_canonical_type())
-    return get_canonical_type().get() == other->get_canonical_type().get();
+  if (get_naked_canonical_type() && other->get_naked_canonical_type())
+    return get_naked_canonical_type() == other->get_naked_canonical_type();
 
   return equals(*this, *other, 0);
 }
@@ -13243,7 +13243,6 @@ qualified_type_def::operator==(const decl_base& o) const
   if (get_naked_canonical_type() && other->get_naked_canonical_type())
     return get_naked_canonical_type() == other->get_naked_canonical_type();
 
-
   return equals(*this, *other, 0);
 }
 
@@ -16723,16 +16722,16 @@ function_type::get_cached_name(bool internal) const
 bool
 function_type::operator==(const type_base& other) const
 {
+  const function_type* o = dynamic_cast<const function_type*>(&other);
+  if (!o)
+    return false;
+
   type_base* canonical_type = get_naked_canonical_type();
   type_base* other_canonical_type = other.get_naked_canonical_type();
 
   if (canonical_type && other_canonical_type)
     return canonical_type == other_canonical_type;
 
-  const function_type* o = dynamic_cast<const function_type*>(&other);
-  if (!o)
-    return false;
-
   return equals(*this, *o, 0);
 }
 
@@ -19111,8 +19110,7 @@ class_or_union::operator==(const decl_base& other) const
   if (canonical_type && other_canonical_type)
     return canonical_type == other_canonical_type;
 
-  const class_or_union& o = *op;
-  return equals(*this, o, 0);
+  return equals(*this, *op, 0);
 }
 
 /// Equality operator.
@@ -20966,8 +20964,7 @@ class_decl::operator==(const decl_base& other) const
   if (canonical_type && other_canonical_type)
     return canonical_type == other_canonical_type;
 
-  const class_decl& o = *op;
-  return equals(*this, o, 0);
+  return equals(*this, *op, 0);
 }
 
 /// Equality operator for class_decl.
@@ -21755,8 +21752,7 @@ union_decl::operator==(const decl_base& other) const
   if (canonical_type && other_canonical_type)
     return canonical_type == other_canonical_type;
 
-  const union_decl &o = *op;
-  return equals(*this, o, 0);
+  return equals(*this, *op, 0);
 }
 
 /// Equality operator for union_decl.
-- 
2.27.0.383.g050319c2ae-goog