[LLVMbugs] [Bug 6510] New: PM doesn't terminate when processing passes with circular dependency + patch

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=6510

           Summary: PM doesn't terminate when processing passes with
                    circular dependency + patch
           Product: libraries
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Core LLVM classes
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: philipp.legrum at daimler.com
                CC: llvmbugs at cs.uiuc.edu


The LLVM Pass manager gets caught in an infinite recursion when dealing with
passes that have a circular dependency ultimately resulting in a stack
overflow.

I created a patch that tracks the recursive insertion of passes monitoring if
the manager inserts a pass that it is currently inserting in an outer
invocation of PMTopLevelManager::schedulePass.

The modification now aborts more gracefully printing out the cyclic dependency.

Patch needs review.

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