Support dlsym loading from libgraphics vtables

library/Core.cpp

@@ -1558,8 +1558,6 @@ std::string Core::getHackPath()
 #endif
 }
 
-void init_screen_module(Core *);
-
 bool Core::Init()
 {
     if(started)
@@ -1706,7 +1704,6 @@ bool Core::Init()
     */
     // initialize data defs
     virtual_identity::Init(this);
-    init_screen_module(this);
 
     // copy over default config files if necessary
     std::vector<std::string> config_files;

library/PlugLoad-posix.cpp

@@ -23,6 +23,7 @@
  */
 namespace DFHack
 {
+    DFLibrary* GLOBAL_NAMES = (DFLibrary*)RTLD_DEFAULT;
     DFLibrary * OpenPlugin (const char * filename)
     {
         dlerror();

library/PlugLoad-windows.cpp

@@ -41,6 +41,8 @@ distribution.
  */
 namespace DFHack
 {
+    //! \todo What windows HMODULE matches RTLD_DEFAULT?
+    DFLibrary* GLOBAL_NAMES = 0;
     DFLibrary * OpenPlugin (const char * filename)
     {
         return (DFLibrary *) LoadLibrary(filename);

library/VersionInfoFactory.cpp

@@ -35,6 +35,7 @@ using namespace std;
 #include "VersionInfo.h"
 #include "Error.h"
 #include "Memory.h"
+#include "PluginManager.h"
 using namespace DFHack;
 
 #include <tinyxml.h>
@@ -133,18 +134,30 @@ void VersionInfoFactory::ParseVersion (TiXmlElement* entry, VersionInfo* mem)
             if(!cstr_key)
                 throw Error::SymbolsXmlUnderspecifiedEntry(cstr_name);
             const char *cstr_value = pMemEntry->Attribute("value");
-            if(!cstr_value)
+            const char *cstr_mangled = pMemEntry->Attribute("mangled");
+            if(!cstr_value && !cstr_mangled)
             {
                 cerr << "Dummy symbol table entry: " << cstr_key << endl;
                 continue;
             }
             if ((is_vtable && no_vtables) || (!is_vtable && no_globals))
                 continue;
-#ifdef DFHACK64
-            uintptr_t addr = strtoull(cstr_value, 0, 0);
-#else
-            uintptr_t addr = strtol(cstr_value, 0, 0);
-#endif
+            uintptr_t addr;
+            if (cstr_value) {
+                if (sizeof(addr) == sizeof(unsigned long))
+                    addr = strtoul(cstr_value, 0, 0);
+                else
+                    addr = strtoull(cstr_value, 0, 0);
+            } else {
+                addr = (uintptr_t)DFHack::LookupPlugin(DFHack::GLOBAL_NAMES, cstr_mangled);
+                if (!addr)
+                    continue;
+                const char *cstr_offset = pMemEntry->Attribute("offset");
+                if (cstr_offset) {
+                    unsigned long offset = strtoul(cstr_offset, 0, 0);
+                    addr += offset;
+                }
+            }
             if (is_vtable)
                 mem->setVTable(cstr_key, addr);
             else

library/include/PluginManager.h

@@ -67,6 +67,8 @@ namespace DFHack
     // anon type, pretty much
     struct DFLibrary;
 
+    // DFLibrary* that can be used to resolve global names
+    extern DFLibrary* GLOBAL_NAMES;
     // Open a plugin library
     DFHACK_EXPORT DFLibrary * OpenPlugin (const char * filename);
     // find a symbol inside plugin

library/modules/Screen.cpp

@@ -412,58 +412,6 @@ void Hide::merge(df::viewscreen* a)
 }
 } }
 
-#ifdef _LINUX
-class DFHACK_EXPORT renderer {
-    unsigned char *screen;
-    long *screentexpos;
-    char *screentexpos_addcolor;
-    unsigned char *screentexpos_grayscale;
-    unsigned char *screentexpos_cf;
-    unsigned char *screentexpos_cbr;
-    // For partial printing:
-    unsigned char *screen_old;
-    long *screentexpos_old;
-    char *screentexpos_addcolor_old;
-    unsigned char *screentexpos_grayscale_old;
-    unsigned char *screentexpos_cf_old;
-    unsigned char *screentexpos_cbr_old;
-public:
-    virtual void update_tile(int x, int y) {};
-    virtual void update_all() {};
-    virtual void render() {};
-    virtual void set_fullscreen();
-    virtual void zoom(df::zoom_commands cmd);
-    virtual void resize(int w, int h) {};
-    virtual void grid_resize(int w, int h) {};
-    renderer() {
-        screen = NULL;
-        screentexpos = NULL;
-        screentexpos_addcolor = NULL;
-        screentexpos_grayscale = NULL;
-        screentexpos_cf = NULL;
-        screentexpos_cbr = NULL;
-        screen_old = NULL;
-        screentexpos_old = NULL;
-        screentexpos_addcolor_old = NULL;
-        screentexpos_grayscale_old = NULL;
-        screentexpos_cf_old = NULL;
-        screentexpos_cbr_old = NULL;
-    }
-    virtual ~renderer();
-    virtual bool get_mouse_coords(int &x, int &y) { return false; }
-    virtual bool uses_opengl();
-};
-#endif
-
-void init_screen_module(Core *core)
-{
-#ifdef _LINUX
-    renderer tmp;
-    if (!strict_virtual_cast<df::renderer>((virtual_ptr)&tmp))
-        cerr << "Could not fetch the renderer vtable." << std::endl;
-#endif
-}
-
 string Screen::getKeyDisplay(df::interface_key key)
 {
     if (enabler)