void initializeAliasSetPrinterPass(PassRegistry&);
void initializeAlwaysInlinerPass(PassRegistry&);
void initializeArgPromotionPass(PassRegistry&);
+void initializeBarrierNoopPass(PassRegistry&);
void initializeBasicAliasAnalysisPass(PassRegistry&);
void initializeBasicCallGraphPass(PassRegistry&);
void initializeBlockExtractorPassPass(PassRegistry&);
--- /dev/null
+//===- BarrierNoopPass.cpp - A barrier pass for the pass manager ----------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// NOTE: DO NOT USE THIS IF AVOIDABLE
+//
+// This pass is a nonce pass intended to allow manipulation of the implicitly
+// nesting pass manager. For example, it can be used to cause a CGSCC pass
+// manager to be closed prior to running a new collection of function passes.
+//
+// FIXME: This is a huge HACK. This should be removed when the pass manager's
+// nesting is made explicit instead of implicit.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Pass.h"
+#include "llvm/Transforms/IPO.h"
+using namespace llvm;
+
+namespace {
+/// \brief A nonce module pass used to place a barrier in a pass manager.
+///
+/// There is no mechanism for ending a CGSCC pass manager once one is started.
+/// This prevents extension points from having clear deterministic ordering
+/// when they are phrased as non-module passes.
+class BarrierNoop : public ModulePass {
+public:
+ static char ID; // Pass identification.
+
+ BarrierNoop() : ModulePass(ID) {
+ initializeBarrierNoopPass(*PassRegistry::getPassRegistry());
+ }
+
+ bool runOnModule(Module &M) { return false; }
+};
+}
+
+ModulePass *llvm::createBarrierNoopPass() { return new BarrierNoop(); }
+
+char BarrierNoop::ID = 0;
+INITIALIZE_PASS(BarrierNoop, "barrier", "A No-Op Barrier Pass",
+ false, false)
MPM.add(Inliner);
Inliner = 0;
}
+
+ // FIXME: This is a HACK! The inliner pass above implicitly creates a CGSCC
+ // pass manager, but we don't want to add extensions into that pass manager.
+ // To prevent this we must insert a no-op module pass to reset the pass
+ // manager to get the same behavior as EP_OptimizerLast in non-O0 builds.
+ if (!GlobalExtensions->empty() || !Extensions.empty())
+ MPM.add(createBarrierNoopPass());
+
addExtensionsToPM(EP_EnabledOnOptLevel0, MPM);
return;
}