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| author | Nick Lewycky <nicholas@mxc.ca> | 2011-01-26 08:40:22 +0000 |
|---|---|---|
| committer | Nick Lewycky <nicholas@mxc.ca> | 2011-01-26 08:40:22 +0000 |
| commit | d9e6b4a8ff25a2756c438edbec2114797fc280f3 (patch) | |
| tree | 1dc3d39c41350c599ab32ac45a50d13cdd768ba5 /llvm/lib/Analysis/ScalarEvolution.cpp | |
| parent | db9d66424425ad4d00c3bb499ad913beaeeda0f1 (diff) | |
| download | llvm-d9e6b4a8ff25a2756c438edbec2114797fc280f3.zip llvm-d9e6b4a8ff25a2756c438edbec2114797fc280f3.tar.gz llvm-d9e6b4a8ff25a2756c438edbec2114797fc280f3.tar.bz2 | |
Fix memory corruption. If one of the SCEV creation functions calls another but
doesn't return immediately after then the insert position in UniqueSCEVs will
be out of date. No test because this is a memory corruption issue. Fixes PR9051!
llvm-svn: 124282
Diffstat (limited to 'llvm/lib/Analysis/ScalarEvolution.cpp')
| -rw-r--r-- | llvm/lib/Analysis/ScalarEvolution.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp index c10af50..c2f3ac0 100644 --- a/llvm/lib/Analysis/ScalarEvolution.cpp +++ b/llvm/lib/Analysis/ScalarEvolution.cpp @@ -831,6 +831,7 @@ const SCEV *ScalarEvolution::getTruncateExpr(const SCEV *Op, } if (!hasTrunc) return getAddExpr(Operands, false, false); + UniqueSCEVs.FindNodeOrInsertPos(ID, IP); // Mutates IP, returns NULL. } // trunc(x1*x2*...*xN) --> trunc(x1)*trunc(x2)*...*trunc(xN) if we can @@ -845,6 +846,7 @@ const SCEV *ScalarEvolution::getTruncateExpr(const SCEV *Op, } if (!hasTrunc) return getMulExpr(Operands, false, false); + UniqueSCEVs.FindNodeOrInsertPos(ID, IP); // Mutates IP, returns NULL. } // If the input value is a chrec scev, truncate the chrec's operands. |