[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>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207430 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 0 deletions

diff --git a/lib/IR/Pass.cpp b/lib/IR/Pass.cpp
index bb55d2af7c..58ae821db2 100644
--- a/lib/IR/Pass.cpp
+++ b/lib/IR/Pass.cpp
@@ -17,6 +17,7 @@
 #include "llvm/IR/Function.h"
 #include "llvm/IR/IRPrintingPasses.h"
 #include "llvm/IR/LegacyPassNameParser.h"
+#include "llvm/IR/LLVMContext.h"
 #include "llvm/PassRegistry.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
@@ -242,6 +243,18 @@ void PassRegistrationListener::enumeratePasses() {
   PassRegistry::getPassRegistry()->enumerateWith(this);
 }
 
+//===----------------------------------------------------------------------===//
+// PassRunListener implementation
+//
+
+// PassRunListener ctor - Add the current object to the list of
+// PassRunListeners...
+PassRunListener::PassRunListener(LLVMContext *C) {
+  C->addRunListener(this);
+}
+
+PassRunListener::~PassRunListener() {}
+
 PassNameParser::~PassNameParser() {}
 
 //===----------------------------------------------------------------------===//