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4e0cc51d79
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
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