elf: store object list in an area easily accessible to the debugger

Since we're loading many objects, we need to make them accessible to the
debugger so it can load symbol tables.

elf.cc

@@ -564,6 +564,7 @@ namespace elf {
             _files[name] = ef;
             ef->load_segments();
             _next_alloc = ef->end();
+            add_debugger_obj(ef);
             ef->load_needed();
             ef->relocate();
             ef->run_init_func();
@@ -571,6 +572,17 @@ namespace elf {
         return _files[name];
     }
 
+    elf_object* program::s_objs[100];
+
+    void program::add_debugger_obj(elf_object* obj)
+    {
+        auto p = s_objs;
+        while (*p) {
+            ++p;
+        }
+        *p = obj;
+    }
+
     symbol_module program::lookup(const char* name)
     {
         // FIXME: correct lookup order?

elf.hh

@@ -330,12 +330,15 @@ namespace elf {
         // run a function with all current modules as a parameter
         void with_modules(std::function<void (std::vector<elf_object*>&)> f);
     private:
+        void add_debugger_obj(elf_object* obj);
         void* do_lookup_function(const char* symbol);
     private:
         ::filesystem& _fs;
         void* _next_alloc;
         std::unique_ptr<elf_object> _core;
         std::map<std::string, elf_object*> _files;
+        // debugger interface
+        static elf_object* s_objs[100];
     };
 
     program* get_program();