Changeset 4c58668 in mainline

Timestamp:

2018-07-05T21:41:18Z (6 years ago)

Author:

Dzejrou <dzejrou@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

973a268

Parents:

ad403590

git-author:

Jaroslav Jindrak <dzejrou@…> (2017-11-23 23:23:49)

git-committer:

Dzejrou <dzejrou@…> (2018-07-05 21:41:18)

Message:

cpp: misc modifications

File:

• uspace/lib/cpp/src/internal/runtime.cpp (modified) (2 diffs)

uspace/lib/cpp/src/internal/runtime.cpp

@@ -36 +36 @@
      * call of a pure virtual function cannot be made.
      */
+    // TODO: terminate in this
     extern "C" void __cxa_pure_call()
     { /* DUMMY BODY */ }
@@ -69 +70 @@
     { /* DUMMY BODY */ }
 
+    /**
+     * This structure represents part of the vtable segment
+     * that contains data related to dynamic_cast.
+     */
+    struct vtable
+    {
+        // Unimportant to us.
+
+        std::ptrdiff_t offset_to_top;
+        std::type_info* tinfo;
+
+        // Actual vtable.
+    };
     extern "C" void* __dynamic_cast(const void* sub, const __class_type_info* src,
                                     const __class_type_info* dst, std::ptrdiff_t offset)
     {
         // TODO: implement
+        // NOTE: as far as I understand it, we get vtable prefix from sub, get the type_info
+        //       ptr from that and then climb the inheritance hierarchy upwards till we either
+        //       fint dst or fail and return nullptr
         return nullptr;
     }