[LPM] Teach the legacy pass manager to support *using* an analysis

[oota-llvm.git] / lib / IR / LegacyPassManager.cpp

diff --git a/lib/IR/LegacyPassManager.cpp b/lib/IR/LegacyPassManager.cpp
index 3ed4adba4c72790254fe7afb39298358c172fe94..5483da1c5e5d05efb37bd8313a11b4e7b7ba0e18 100644 (file)
--- a/lib/IR/LegacyPassManager.cpp
+++ b/lib/IR/LegacyPassManager.cpp
@@ -989,29 +989,28 @@ void PMDataManager::add(Pass *P, bool ProcessAnalysis) {
 
   // At the moment, this pass is the last user of all required passes.
   SmallVector<Pass *, 12> LastUses;
-  SmallVector<Pass *, 8> RequiredPasses;
+  SmallVector<Pass *, 8> UsedPasses;
   SmallVector<AnalysisID, 8> ReqAnalysisNotAvailable;
 
   unsigned PDepth = this->getDepth();
 
-  collectRequiredAnalysis(RequiredPasses,
-                          ReqAnalysisNotAvailable, P);
-  for (Pass *PRequired : RequiredPasses) {
+  collectRequiredAndUsedAnalyses(UsedPasses, ReqAnalysisNotAvailable, P);
+  for (Pass *PUsed : UsedPasses) {
     unsigned RDepth = 0;
 
-    assert(PRequired->getResolver() && "Analysis Resolver is not set");
-    PMDataManager &DM = PRequired->getResolver()->getPMDataManager();
+    assert(PUsed->getResolver() && "Analysis Resolver is not set");
+    PMDataManager &DM = PUsed->getResolver()->getPMDataManager();
     RDepth = DM.getDepth();
 
     if (PDepth == RDepth)
-      LastUses.push_back(PRequired);
+      LastUses.push_back(PUsed);
     else if (PDepth > RDepth) {
       // Let the parent claim responsibility of last use
-      TransferLastUses.push_back(PRequired);
+      TransferLastUses.push_back(PUsed);
       // Keep track of higher level analysis used by this manager.
-      HigherLevelAnalysis.push_back(PRequired);
+      HigherLevelAnalysis.push_back(PUsed);
     } else
-      llvm_unreachable("Unable to accommodate Required Pass");
+      llvm_unreachable("Unable to accommodate Used Pass");
   }
 
   // Set P as P's last user until someone starts using P.
@@ -1044,22 +1043,27 @@ void PMDataManager::add(Pass *P, bool ProcessAnalysis) {
 }
 
 
-/// Populate RP with analysis pass that are required by
+/// Populate UP with analysis pass that are used or required by
 /// pass P and are available. Populate RP_NotAvail with analysis
 /// pass that are required by pass P but are not available.
-void PMDataManager::collectRequiredAnalysis(SmallVectorImpl<Pass *> &RP,
-                                       SmallVectorImpl<AnalysisID> &RP_NotAvail,
-                                            Pass *P) {
+void PMDataManager::collectRequiredAndUsedAnalyses(
+    SmallVectorImpl<Pass *> &UP, SmallVectorImpl<AnalysisID> &RP_NotAvail,
+    Pass *P) {
   AnalysisUsage *AnUsage = TPM->findAnalysisUsage(P);
+
+  for (const auto &UsedID : AnUsage->getUsedSet())
+    if (Pass *AnalysisPass = findAnalysisPass(UsedID, true))
+      UP.push_back(AnalysisPass);
+
   for (const auto &RequiredID : AnUsage->getRequiredSet())
     if (Pass *AnalysisPass = findAnalysisPass(RequiredID, true))
-      RP.push_back(AnalysisPass);
+      UP.push_back(AnalysisPass);
     else
       RP_NotAvail.push_back(RequiredID);
 
   for (const auto &RequiredID : AnUsage->getRequiredTransitiveSet())
     if (Pass *AnalysisPass = findAnalysisPass(RequiredID, true))
-      RP.push_back(AnalysisPass);
+      UP.push_back(AnalysisPass);
     else
       RP_NotAvail.push_back(RequiredID);
 }
@@ -1196,6 +1200,15 @@ void PMDataManager::dumpPreservedSet(const Pass *P) const {
   dumpAnalysisUsage("Preserved", P, analysisUsage.getPreservedSet());
 }
 
+void PMDataManager::dumpUsedSet(const Pass *P) const {
+  if (PassDebugging < Details)
+    return;
+
+  AnalysisUsage analysisUsage;
+  P->getAnalysisUsage(analysisUsage);
+  dumpAnalysisUsage("Used", P, analysisUsage.getUsedSet());
+}
+
 void PMDataManager::dumpAnalysisUsage(StringRef Msg, const Pass *P,
                                    const AnalysisUsage::VectorType &Set) const {
   assert(PassDebugging >= Details);
@@ -1300,6 +1313,7 @@ bool BBPassManager::runOnFunction(Function &F) {
         dumpPassInfo(BP, MODIFICATION_MSG, ON_BASICBLOCK_MSG,
                      I->getName());
       dumpPreservedSet(BP);
+      dumpUsedSet(BP);
 
       verifyPreservedAnalysis(BP);
       removeNotPreservedAnalysis(BP);
@@ -1514,6 +1528,7 @@ bool FPPassManager::runOnFunction(Function &F) {
     if (LocalChanged)
       dumpPassInfo(FP, MODIFICATION_MSG, ON_FUNCTION_MSG, F.getName());
     dumpPreservedSet(FP);
+    dumpUsedSet(FP);
 
     verifyPreservedAnalysis(FP);
     removeNotPreservedAnalysis(FP);
@@ -1591,6 +1606,7 @@ MPPassManager::runOnModule(Module &M) {
       dumpPassInfo(MP, MODIFICATION_MSG, ON_MODULE_MSG,
                    M.getModuleIdentifier());
     dumpPreservedSet(MP);
+    dumpUsedSet(MP);
 
     verifyPreservedAnalysis(MP);
     removeNotPreservedAnalysis(MP);