Add a mechanism for optimisation plugins to register passes that all front ends can use without needing to be aware of the plugin (or the plugin be aware of the front end).

Before 3.0, I'd like to add a mechanism for automatically loading a set of plugins from a config file.  API suggestions welcome...

llvm-svn: 137717

1 files changed, 15 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
index 6a35879786a..8fdfd72237f 100644
--- a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -25,6 +25,8 @@
 #include "llvm/Target/TargetLibraryInfo.h"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/Transforms/IPO.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/ManagedStatic.h"
 
 using namespace llvm;
 
@@ -43,12 +45,25 @@ PassManagerBuilder::~PassManagerBuilder() {
   delete Inliner;
 }
 
+/// Set of global extensions, automatically added as part of the standard set.
+static ManagedStatic<SmallVector<std::pair<PassManagerBuilder::ExtensionPointTy,
+   PassManagerBuilder::ExtensionFn>, 8> > GlobalExtensions;
+
+void PassManagerBuilder::addGlobalExtension(
+    PassManagerBuilder::ExtensionPointTy Ty,
+    PassManagerBuilder::ExtensionFn Fn) {
+  GlobalExtensions->push_back(std::make_pair(Ty, Fn));
+}
+
 void PassManagerBuilder::addExtension(ExtensionPointTy Ty, ExtensionFn Fn) {
   Extensions.push_back(std::make_pair(Ty, Fn));
 }
 
 void PassManagerBuilder::addExtensionsToPM(ExtensionPointTy ETy,
                                            PassManagerBase &PM) const {
+  for (unsigned i = 0, e = GlobalExtensions->size(); i != e; ++i)
+    if ((*GlobalExtensions)[i].first == ETy)
+      (*GlobalExtensions)[i].second(*this, PM);
   for (unsigned i = 0, e = Extensions.size(); i != e; ++i)
     if (Extensions[i].first == ETy)
       Extensions[i].second(*this, PM);