[llvm-bugs] [Bug 44580] New: clang frontend crash due to an exponential complexity of typo corrector

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44580

            Bug ID: 44580
           Summary: clang frontend crash due to an exponential complexity
                    of typo corrector
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: RudenkoRNK at gmail.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

Created attachment 23023
  --> https://bugs.llvm.org/attachment.cgi?id=23023&action=edit
typos.cpp from description

Compiling typos.cpp ends with an "LLVM ERROR: out of memory"


typos.cpp is a very simple file with n=10 int definitions and a function call
with n arguments. 
When clang analyzes this file it tries to correct typos in it. In order to do
this it calls method
clangSema::SemaExprCXX.cpp::CheckAndAdvanceTypoExprCorrectionStreams

The problem is that amount of calls is around 8^(n-1), which leads to a crash
or infinitely long waiting time.

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