3 files changed, 27 insertions, 2 deletions
diff --git a/src/mapi/mapi/mapi_glapi.c b/src/mapi/mapi/mapi_glapi.c
index adfc0cbcc9f..4627c4de02b 100644
--- a/src/mapi/mapi/mapi_glapi.c
+++ b/src/mapi/mapi/mapi_glapi.c
@@ -219,8 +219,8 @@ _glapi_get_proc_address(const char *funcName)
 const char *
 _glapi_get_proc_name(unsigned int offset)
 {
-   /* not implemented */
-   return NULL;
+   const struct mapi_stub *stub = stub_find_by_slot(offset);
+   return stub ? stub_get_name(stub) : NULL;
 }
 
 unsigned long
diff --git a/src/mapi/mapi/stub.c b/src/mapi/mapi/stub.c
index 6fb8556d140..688dc8143a4 100644
--- a/src/mapi/mapi/stub.c
+++ b/src/mapi/mapi/stub.c
@@ -153,6 +153,28 @@ stub_find_dynamic(const char *name, int generate)
    return stub;
 }
 
+static const struct mapi_stub *
+search_table_by_slot(const struct mapi_stub *table, size_t num_entries,
+                     int slot)
+{
+   size_t i;
+   for (i = 0; i < num_entries; ++i) {
+      if (table[i].slot == slot)
+         return &table[i];
+   }
+   return NULL;
+}
+
+const struct mapi_stub *
+stub_find_by_slot(int slot)
+{
+   const struct mapi_stub *stub =
+      search_table_by_slot(public_stubs, ARRAY_SIZE(public_stubs), slot);
+   if (stub)
+      return stub;
+   return search_table_by_slot(dynamic_stubs, num_dynamic_stubs, slot);
+}
+
 void
 stub_fix_dynamic(struct mapi_stub *stub, const struct mapi_stub *alias)
 {
diff --git a/src/mapi/mapi/stub.h b/src/mapi/mapi/stub.h
index b2b6f1839c6..98e2553ecdd 100644
--- a/src/mapi/mapi/stub.h
+++ b/src/mapi/mapi/stub.h
@@ -42,6 +42,9 @@ stub_find_public(const char *name);
 struct mapi_stub *
 stub_find_dynamic(const char *name, int generate);
 
+const struct mapi_stub *
+stub_find_by_slot(int slot);
+
 void
 stub_fix_dynamic(struct mapi_stub *stub, const struct mapi_stub *alias);