Add a new PlatformDarwinKernel for kernel debugging. This Platform

plugin will index the kext bundles on the local filesystem when
created.  During a kernel debug session, when the DynamicLoader
plugin needs to locate a kext by name like
"com.apple.com.apple.filesystems.autofs", the Platform can quickly
look for a UUID match in those kernel debug kit directories it
previously indexed.

I'm still working on profiling the performance impact of the inital
kext bundle scan; there will likely need to be a switch to enable
or disable this plugin's scan.

This only affects Mac kernel debugging and the code is only built
on Apple systems because of some use of low-level CoreFoundation
to parse plists.

<rdar://problem/13503583> 

llvm-svn: 178827

1 files changed, 31 insertions, 0 deletions

diff --git a/lldb/source/Target/Platform.cpp b/lldb/source/Target/Platform.cpp
index dddccad07bf..bc365603774 100644
--- a/lldb/source/Target/Platform.cpp
+++ b/lldb/source/Target/Platform.cpp
@@ -95,6 +95,37 @@ Platform::LocateExecutableScriptingResources (Target *target, Module &module)
     return FileSpecList();
 }
 
+Platform*
+Platform::FindPlugin (Process *process, const char *plugin_name)
+{
+    PlatformCreateInstance create_callback = NULL;
+    if (plugin_name)
+    {
+        create_callback  = PluginManager::GetPlatformCreateCallbackForPluginName (plugin_name);
+        if (create_callback)
+        {
+            ArchSpec arch;
+            if (process)
+            {
+                arch = process->GetTarget().GetArchitecture();
+            }
+            std::auto_ptr<Platform> instance_ap(create_callback(process, &arch));
+            if (instance_ap.get())
+                return instance_ap.release();
+        }
+    }
+    else
+    {
+        for (uint32_t idx = 0; (create_callback = PluginManager::GetPlatformCreateCallbackAtIndex(idx)) != NULL; ++idx)
+        {
+            std::auto_ptr<Platform> instance_ap(create_callback(process, false));
+            if (instance_ap.get())
+                return instance_ap.release();
+        }
+    }
+    return NULL;
+}
+
 Error
 Platform::GetSharedModule (const ModuleSpec &module_spec,
                            ModuleSP &module_sp,