Update builtin gotcha to v1.0.7

Author: daboehme

ext/gotcha/include/gotcha/gotcha.h

@@ -30,10 +30,12 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 #ifndef GOTCHA_H
 #define GOTCHA_H
 
+/* Only contains the GOTCHA version, not needed for our Caliper copy
+#include <gotcha/gotcha_config.h>
+*/
+#include <gotcha/gotcha_types.h>
 #include <link.h>
 
-#include "gotcha/gotcha_types.h"
-
 #if defined(__cplusplus)
 extern "C" {
 #endif

ext/gotcha/src/gotcha.c

@@ -40,7 +40,7 @@ static void setBindingAddressPointer(struct gotcha_binding_t *in, void *value) {
   writeAddress(target, value);
 }
 
-static void **getInternalBindingAddressPointer(struct internal_binding_t **in) {
+void **getInternalBindingAddressPointer(struct internal_binding_t **in) {
   return (void **)&((*in)->wrappee_pointer);
 }
 

ext/gotcha/src/gotcha_dl.c

@@ -113,6 +113,7 @@ static int per_binding(hash_key_t key, hash_data_t data,
                binding->user_binding->name,
                binding->associated_binding_table->tool->tool_name);
 
+  if (!binding->user_binding->name) return 0;
   while (binding->next_binding) {
     binding = binding->next_binding;  // GCOVR_EXCL_START
     debug_printf(3,
@@ -157,7 +158,18 @@ static void *dlsym_wrapper(void *handle, const char *symbol_name) {
   debug_printf(1, "User called dlsym(%p, %s)\n", handle, symbol_name);
   int result = lookup_hashtable(&function_hash_table, (hash_key_t)symbol_name,
                                 (hash_data_t *)&binding);
-  if (result != -1) return binding->user_binding->wrapper_pointer;
+  void *val = orig_dlsym(handle, symbol_name);
+  if (result != -1) {
+    void **wrappee_ptr = getInternalBindingAddressPointer(
+        (struct internal_binding_t **)binding->user_binding->function_handle);
+    if (val == NULL || *wrappee_ptr == val) {
+      // if the wrapper is found and the wrappee is the function requested.
+      // This is needed in cases where we wrap a function F1 from library A and
+      // we dynamically load function F1 from library B. As name is same, we
+      // need to make sure the wrappee are the same as well
+      return binding->user_binding->wrapper_pointer;
+    }
+  }
   if (handle == RTLD_NEXT) {
     struct link_map *lib = gotchas_dlsym_rtld_next_lookup(
         symbol_name, __builtin_return_address(0));
@@ -168,7 +180,7 @@ static void *dlsym_wrapper(void *handle, const char *symbol_name) {
     }
     return NULL;
   } else {
-    return orig_dlsym(handle, symbol_name);
+    return val;
   }
 }
 

ext/gotcha/src/gotcha_dl.h

@@ -9,6 +9,7 @@ extern void update_all_library_gots(hash_table_t *bindings);
 extern long lookup_exported_symbol(const char *name, const struct link_map *lib,
                                    void **symbol);
 extern int prepare_symbol(struct internal_binding_t *binding);
+extern void **getInternalBindingAddressPointer(struct internal_binding_t **in);
 
 extern gotcha_wrappee_handle_t orig_dlopen_handle;
 extern gotcha_wrappee_handle_t orig_dlsym_handle;