[LLVMbugs] [Bug 15750] New: GDBJITRegistrar not thread-safe (makes MCJIT not thread-safe)

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15750

            Bug ID: 15750
           Summary: GDBJITRegistrar not thread-safe (makes MCJIT not
                    thread-safe)
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Generic Execution Engine Support
          Assignee: unassignedbugs at nondot.org
          Reporter: jim.kearney at oracle.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

GDBJITRegistrar::(de)registerObject() accesses a member variable
ObjectBufferMap without any synchronization.  The class is used as a singleton
and so multiple instances of MCJIT try to modify that map simultaneously.

The code is written to be thread-safe with its access to gdb variables but not
with its own state, which is strange given its singleton nature.

Also, JITRegistrar::getGDBRegistrar should use ManagedStatic.  The
initialization pattern it uses is not guaranteed thread-safe.

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