[PM] Add pass run listeners to the pass manager.

This commit provides the necessary C/C++ APIs and infastructure to enable fine-
grain progress report and safe suspension points after each pass in the pass
manager.

Clients can provide a callback function to the pass manager to call after each
pass. This can be used in a variety of ways (progress report, dumping of IR
between passes, safe suspension of threads, etc).

The run listener list is maintained in the LLVMContext, which allows a multi-
threaded client to be only informed for it's own thread. This of course assumes
that the client created a LLVMContext for each thread.

This fixes <rdar://problem/16728690>

llvm-svn: 207430

1 files changed, 20 insertions, 0 deletions

diff --git a/llvm/lib/IR/LLVMContext.cpp b/llvm/lib/IR/LLVMContext.cpp
index 588e121..b2d3bc9 100644
--- a/llvm/lib/IR/LLVMContext.cpp
+++ b/llvm/lib/IR/LLVMContext.cpp
@@ -214,3 +214,23 @@ void LLVMContext::getMDKindNames(SmallVectorImpl<StringRef> &Names) const {
        E = pImpl->CustomMDKindNames.end(); I != E; ++I)
     Names[I->second] = I->first();
 }
+
+//===----------------------------------------------------------------------===//
+// Pass Run Listeners
+//===----------------------------------------------------------------------===//
+/// Notify that we finished running a pass.
+void LLVMContext::notifyPassRun(Pass *P, Module *M, Function *F, BasicBlock *BB)
+{
+  pImpl->notifyPassRun(this, P, M, F, BB);
+}
+/// Register the given PassRunListener to receive notifyPassRun() callbacks
+/// whenever a pass ran. The context will take ownership of the listener and
+/// free it when the context is destroyed.
+void LLVMContext::addRunListener(PassRunListener *L) {
+  pImpl->addRunListener(L);
+}
+/// Unregister a PassRunListener so that it no longer receives notifyPassRun()
+/// callbacks. Remove and free the listener from the context.
+void LLVMContext::removeRunListener(PassRunListener *L) {
+  pImpl->removeRunListener(L);
+}