[PATCH] abg-reader.cc: track WIP types by pointer not name

[Giuliano Procida <gprocida@google.com>]

When reading ABI XML files, the reader needs to construct types
progressively as any type may depend on other types and even on
itself. Such work-in-progress types are tracked explicitly.

The storage used for this is a map from (external, qualified) type
name to a count of how many times the type (name) has been seen.

However, function type names are invariably stored as "void ()" as
they are incomplete at the point they are added to the map. When the
reader later attempts to remove the marking they have their proper,
different names. In short, the code doesn't do what it's supposed to.

This commit changes the map key from string to const type_base*.
Equality on type_base_sptr has been defined to be a deep comparison so
storing those wouldn't be quite right.

Note that this removes some of the call paths that result in incorrect
(external) type names being cached (regardless of whether they are
actually used).

	* src/abg-reader.cc (xml_reader::m_wip_types_map): Change type
	to unordered_map<const type_base*, size_t>.
	(xml_reader::mark_type_as_wip): Just increment count of type
	pointer.
	(xml_reader::unmark_type_as_wip): Add assertion that type
	pointer is present. Decrement type pointer count and remove if
	zero.
	(xml_reader::is_wip_type): Test if type pointer in map.

Signed-off-by: Giuliano Procida <gprocida@google.com>
---
 src/abg-reader.cc | 26 +++++++-------------------
 1 file changed, 7 insertions(+), 19 deletions(-)

diff --git a/src/abg-reader.cc b/src/abg-reader.cc
index eb74659f..fe82f4ec 100644
--- a/src/abg-reader.cc
+++ b/src/abg-reader.cc
@@ -119,7 +119,7 @@ private:
   unordered_map<string, vector<type_base_sptr> >	m_types_map;
   unordered_map<string, shared_ptr<function_tdecl> >	m_fn_tmpl_map;
   unordered_map<string, shared_ptr<class_tdecl> >	m_class_tmpl_map;
-  unordered_map<string, size_t>			m_wip_types_map;
+  abg_compat::unordered_map<const type_base*, size_t>	m_wip_types_map;
   vector<type_base_sptr>				m_types_to_canonicalize;
   string_xml_node_map					m_id_xml_node_map;
   xml_node_decl_base_sptr_map				m_xml_node_decl_map;
@@ -534,12 +534,7 @@ public:
   {
     if (!t)
       return;
-    string qname = get_type_name(t, /*qualified=*/true);
-    unordered_map<string, size_t>::iterator it = m_wip_types_map.find(qname);
-    if (it == m_wip_types_map.end())
-      m_wip_types_map[qname] = 1;
-    else
-      ++it->second;
+    ++(m_wip_types_map[t.get()]);
   }
 
   /// Mark a given class as being *NOT* "Work In Progress" anymore;
@@ -551,13 +546,10 @@ public:
   {
     if (!t)
       return;
-
-    string qname = get_type_name(t, /*qualified=*/true);
-    unordered_map<string, size_t>::iterator it = m_wip_types_map.find(qname);
-    if (it == m_wip_types_map.end())
-      return;
-    if (it->second)
-      --it->second;
+    unordered_map<const type_base*, size_t>::iterator it =
+      m_wip_types_map.find(t.get());
+    ABG_ASSERT(it != m_wip_types_map.end() && it->second > 0);
+    --it->second;
     if (it->second == 0)
       m_wip_types_map.erase(it);
   }
@@ -571,11 +563,7 @@ public:
   {
     if (!t)
       return false;
-
-    string qname = get_type_name(t, /*qualified=*/true);
-    unordered_map<string, size_t>::const_iterator i =
-      m_wip_types_map.find(qname);
-    return i != m_wip_types_map.end();
+    return m_wip_types_map.count(t.get());
   }
 
   /// Test if two types are equal, without comparing them structurally.
-- 
2.27.0.111.gc72c7da667-goog