[LLVMbugs] [Bug 21682] New: TrieEdge leak in MachONormalizedFileBinaryWriter.cpp

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21682

            Bug ID: 21682
           Summary: TrieEdge leak in MachONormalizedFileBinaryWriter.cpp
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: devlists at shadowlab.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

TrieNode uses a SmallVector to store TrieEdge children.
But TrieNode is allocated using an llvm::bumpPtr allocator, and so its
destructor is never invoked when the memory is freed. As a result the
SmallVector destructor is never call either, and as the SmallVector is not
allocator aware, the memory managed by the SmallVector leaks.

A possible solution would be to use an other structure to store the TrieEdge
(chained list) that does not require additional memory allocation.
TrieEdge will contain a pointer to its sibling, and will be allocated using the
llvm bumpPtr allocator.

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