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LPPassManager. Implement preparePassManager() hook.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34975 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2007-03-06 17:59:37 +00:00
parent 7b65dd91c1
commit 22033be445
2 changed files with 34 additions and 1 deletions
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10
include/llvm/Analysis/LoopPass.h
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@ -44,7 +44,15 @@ class LoopPass : public Pass {
// Finalization hook does not supply Loop because at this time // Finalization hook does not supply Loop because at this time
// loop nest is completely different. // loop nest is completely different.
virtual bool doFinalization() { return false; } virtual bool doFinalization() { return false; }
// Check if this pass is suitable for the current LPPassManager, if
// available. This pass P is not suitable for a LPPassManager if P
// is not preserving higher level analysis info used by other
// LPPassManager passes. In such case, pop LPPassManager from the
// stack. This will force assignPassManager() to create new
// LPPassManger as expected.
void preparePassManager(PMStack &PMS);
/// Assign pass manager to manager this pass /// Assign pass manager to manager this pass
virtual void assignPassManager(PMStack &PMS, virtual void assignPassManager(PMStack &PMS,
PassManagerType PMT = PMT_LoopPassManager); PassManagerType PMT = PMT_LoopPassManager);

25
lib/Analysis/LoopPass.cpp
View File

@ -129,6 +129,31 @@ bool LPPassManager::runOnFunction(Function &F) {
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
// LoopPass // LoopPass
// Check if this pass is suitable for the current LPPassManager, if
// available. This pass P is not suitable for a LPPassManager if P
// is not preserving higher level analysis info used by other
// LPPassManager passes. In such case, pop LPPassManager from the
// stack. This will force assignPassManager() to create new
// LPPassManger as expected.
void LoopPass::preparePassManager(PMStack &PMS) {
// Find LPPassManager
while (!PMS.empty()) {
if (PMS.top()->getPassManagerType() > PMT_LoopPassManager)
PMS.pop();
else;
break;
}
LPPassManager *LPPM = dynamic_cast<LPPassManager *>(PMS.top());
// If this pass is destroying high level information that is used
// by other passes that are managed by LPM then do not insert
// this pass in current LPM. Use new LPPassManager.
if (LPPM && !LPPM->preserveHigherLevelAnalysis(this))
PMS.pop();
}
/// Assign pass manager to manage this pass. /// Assign pass manager to manage this pass.
void LoopPass::assignPassManager(PMStack &PMS, void LoopPass::assignPassManager(PMStack &PMS,
PassManagerType PreferredType) { PassManagerType PreferredType) {