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Add comment explaining what is lower level analysis pass.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46658 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2008-02-02 01:43:30 +00:00
parent bc9ed593d7
commit 1cf47cb217
1 changed files with 10 additions and 0 deletions
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10
lib/VMCore/PassManager.cpp
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@ -921,6 +921,16 @@ void PMDataManager::addLowerLevelRequiredPass(Pass *P, Pass *RequiredPass) {
TPM->dumpArguments();
TPM->dumpPasses();
}
// Module Level pass may required Function Level analysis info
// (e.g. dominator info). Pass manager uses on the fly function pass manager
// to provide this on demand. In that case, in Pass manager terminology,
// module level pass is requiring lower level analysis info managed by
// lower level pass manager.
// When Pass manager is not able to order required analysis info, Pass manager
// checks whether any lower level manager will be able to provide this
// analysis info on demand or not.
assert (0 && "Unable to handle Pass that requires lower level Analysis pass");
}