From dd4bed3d7a8555db26c256489791bb6c78d5272b Mon Sep 17 00:00:00 2001
From: Jason Molenda <jmolenda@apple.com>
Date: Wed, 12 Jun 2019 01:01:34 +0000
Subject: [PATCH] Back out r363103 ("When reading ObjC class table, use new SPI
 if it is avail") because it breaks the windows bot - asprintf() is not
 available.

llvm-svn: 363115
---
 .../AppleObjCRuntime/AppleObjCRuntimeV2.cpp   | 54 ++-----------------
 1 file changed, 4 insertions(+), 50 deletions(-)

diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
index fe4292a3b168..26fd593029af 100644
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
@@ -157,16 +157,6 @@ __lldb_apple_objc_v2_get_dynamic_class_info (void *gdb_objc_realized_classes_ptr
 
 )";
 
-// We'll substitute in class_getName or class_getNameRaw depending
-// on which is present.
-static const char *g_shared_cache_class_name_funcptr = R"(
-extern "C"
-{
-    const char *%s(void *objc_class);
-    const char *(*class_name_lookup_func)(void *) = %s;
-}
-)";
-
 static const char *g_get_shared_cache_class_info_name =
     "__lldb_apple_objc_v2_get_shared_cache_class_info";
 // Testing using the new C++11 raw string literals. If this breaks GCC then we
@@ -175,6 +165,7 @@ static const char *g_get_shared_cache_class_info_body = R"(
 
 extern "C"
 {
+    const char *class_getName(void *objc_class);
     size_t strlen(const char *);
     char *strncpy (char * s1, const char * s2, size_t n);
     int printf(const char * format, ...);
@@ -295,7 +286,7 @@ __lldb_apple_objc_v2_get_shared_cache_class_info (void *objc_opt_ro_ptr,
                 if (class_infos && idx < max_class_infos)
                 {
                     class_infos[idx].isa = (Class)((uint8_t *)clsopt + clsOffset);
-                    const char *name = class_name_lookup_func (class_infos[idx].isa);
+                    const char *name = class_getName (class_infos[idx].isa);
                     DEBUG_PRINTF ("[%u] isa = %8p %s\n", idx, class_infos[idx].isa, name);
                     // Hash the class name so we don't have to read it
                     const char *s = name;
@@ -338,7 +329,7 @@ __lldb_apple_objc_v2_get_shared_cache_class_info (void *objc_opt_ro_ptr,
                 if (class_infos && idx < max_class_infos)
                 {
                     class_infos[idx].isa = (Class)((uint8_t *)clsopt + clsOffset);
-                    const char *name = class_name_lookup_func (class_infos[idx].isa);
+                    const char *name = class_getName (class_infos[idx].isa);
                     DEBUG_PRINTF ("[%u] isa = %8p %s\n", idx, class_infos[idx].isa, name);
                     // Hash the class name so we don't have to read it
                     const char *s = name;
@@ -1598,46 +1589,9 @@ AppleObjCRuntimeV2::UpdateISAToDescriptorMapSharedCache() {
 
   if (!m_get_shared_cache_class_info_code) {
     Status error;
-
-    // If the inferior objc.dylib has the class_getNameRaw function,
-    // use that in our jitted expression.  Else fall back to the old
-    // class_getName.
-    static ConstString g_class_getName_symbol_name("class_getName");
-    static ConstString g_class_getNameRaw_symbol_name("class_getNameRaw");
-    ConstString class_name_getter_function_name = g_class_getName_symbol_name;
-
-    ObjCLanguageRuntime *objc_runtime = ObjCLanguageRuntime::Get(*process);
-    if (objc_runtime) {
-      const ModuleList &images = process->GetTarget().GetImages();
-      std::lock_guard<std::recursive_mutex> guard(images.GetMutex());
-      for (size_t i = 0; i < images.GetSize(); ++i) {
-        lldb::ModuleSP mod_sp = images.GetModuleAtIndexUnlocked(i);
-        if (objc_runtime->IsModuleObjCLibrary(mod_sp)) {
-          const Symbol *symbol =
-              mod_sp->FindFirstSymbolWithNameAndType(g_class_getNameRaw_symbol_name, 
-                                                lldb::eSymbolTypeCode);
-          if (symbol && 
-              (symbol->ValueIsAddress() || symbol->GetAddressRef().IsValid())) {
-            class_name_getter_function_name = g_class_getNameRaw_symbol_name;
-          }
-        }
-      }
-    }
-
-    // Substitute in the correct class_getName / class_getNameRaw function name,
-    // concatenate the two parts of our expression text.  The format string
-    // has two %s's, so provide the name twice.
-    char *class_name_func_ptr_expr = nullptr;
-    asprintf (&class_name_func_ptr_expr, g_shared_cache_class_name_funcptr,
-              class_name_getter_function_name.AsCString(),
-              class_name_getter_function_name.AsCString());
-    std::string shared_class_expression = class_name_func_ptr_expr;
-    shared_class_expression += g_get_shared_cache_class_info_body;
-    free (class_name_func_ptr_expr);
-    
     m_get_shared_cache_class_info_code.reset(
         GetTargetRef().GetUtilityFunctionForLanguage(
-            shared_class_expression.c_str(), eLanguageTypeObjC,
+            g_get_shared_cache_class_info_body, eLanguageTypeObjC,
             g_get_shared_cache_class_info_name, error));
     if (error.Fail()) {
       if (log)