X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FPassAnalysisSupport.h;h=b09ba45e346d3b9bdfdc44925f273ce4414fa3cc;hb=295643b8050d4c45b06032690d707e7281e82c92;hp=d832485b833c925e763ade00cb997720c9c64b15;hpb=cde53d3c1e9d6a2add5de847b44818fbb1d69c20;p=oota-llvm.git

diff --git a/include/llvm/PassAnalysisSupport.h b/include/llvm/PassAnalysisSupport.h
index d832485b833..b09ba45e346 100644
--- a/include/llvm/PassAnalysisSupport.h
+++ b/include/llvm/PassAnalysisSupport.h
@@ -2,8 +2,8 @@
 //
 //                     The LLVM Compiler Infrastructure
 //
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,6 +20,7 @@
 #define LLVM_PASS_ANALYSIS_SUPPORT_H
 
 #include <vector>
+#include "llvm/ADT/SmallVector.h"
 
 namespace llvm {
 
@@ -34,9 +35,14 @@ namespace llvm {
 // Pass infrastructure through the getAnalysisUsage virtual function.
 //
 class AnalysisUsage {
+public:
+  typedef SmallVector<AnalysisID, 32> VectorType;
+
+private:
   // Sets of analyses required and preserved by a pass
-  std::vector<AnalysisID> Required, RequiredTransitive, Preserved;
+  VectorType Required, RequiredTransitive, Preserved;
   bool PreservesAll;
+
 public:
   AnalysisUsage() : PreservesAll(false) {}
 
@@ -44,24 +50,26 @@ public:
   // for a pass.
   //
   AnalysisUsage &addRequiredID(AnalysisID ID) {
+    assert(ID && "Pass class not registered!");
     Required.push_back(ID);
     return *this;
   }
   template<class PassClass>
   AnalysisUsage &addRequired() {
-    assert(Pass::getClassPassInfo<PassClass>() && "Pass class not registered!");
-    Required.push_back(Pass::getClassPassInfo<PassClass>());
-    return *this;
+    return addRequiredID(Pass::getClassPassInfo<PassClass>());
   }
 
-  template<class PassClass>
-  AnalysisUsage &addRequiredTransitive() {
-    AnalysisID ID = Pass::getClassPassInfo<PassClass>();
+  AnalysisUsage &addRequiredTransitiveID(AnalysisID ID) {
     assert(ID && "Pass class not registered!");
     Required.push_back(ID);
     RequiredTransitive.push_back(ID);
     return *this;
   }
+  template<class PassClass>
+  AnalysisUsage &addRequiredTransitive() {
+    AnalysisID ID = Pass::getClassPassInfo<PassClass>();
+    return addRequiredTransitiveID(ID);
+  }
 
   // addPreserved - Add the specified ID to the set of analyses preserved by
   // this pass
@@ -93,11 +101,11 @@ public:
   ///
   void setPreservesCFG();
 
-  const std::vector<AnalysisID> &getRequiredSet() const { return Required; }
-  const std::vector<AnalysisID> &getRequiredTransitiveSet() const {
+  const VectorType &getRequiredSet() const { return Required; }
+  const VectorType &getRequiredTransitiveSet() const {
     return RequiredTransitive;
   }
-  const std::vector<AnalysisID> &getPreservedSet() const { return Preserved; }
+  const VectorType &getPreservedSet() const { return Preserved; }
 };
 
 //===----------------------------------------------------------------------===//
@@ -111,7 +119,7 @@ private:
   AnalysisResolver();  // DO NOT IMPLEMENT
 
 public:
-  AnalysisResolver(PMDataManager &P) : PM(P) { }
+  explicit AnalysisResolver(PMDataManager &P) : PM(P) { }
   
   inline PMDataManager &getPMDataManager() { return PM; }
 
@@ -127,18 +135,25 @@ public:
     return ResultPass;
   }
 
+  // Find pass that is implementing PI. Initialize pass for Function F.
+  Pass *findImplPass(Pass *P, const PassInfo *PI, Function &F);
+
   void addAnalysisImplsPair(const PassInfo *PI, Pass *P) {
     std::pair<const PassInfo*, Pass*> pir = std::make_pair(PI,P);
     AnalysisImpls.push_back(pir);
   }
 
-  // getAnalysisToUpdate - Return an analysis result or null if it doesn't exist
-  Pass *getAnalysisToUpdate(AnalysisID ID, bool Direction) const;
+  /// clearAnalysisImpls - Clear cache that is used to connect a pass to the
+  /// the analysis (PassInfo).
+  void clearAnalysisImpls() {
+    AnalysisImpls.clear();
+  }
+
+  // getAnalysisIfAvailable - Return analysis result or null if it doesn't exist
+  Pass *getAnalysisIfAvailable(AnalysisID ID, bool Direction) const;
 
   // AnalysisImpls - This keeps track of which passes implements the interfaces
   // that are required by the current pass (to implement getAnalysis()).
-  // NOTE : Remove AnalysisImpls from class Pass, when AnalysisResolver
-  // replaces AnalysisResolver
   std::vector<std::pair<const PassInfo*, Pass*> > AnalysisImpls;
 
 private:
@@ -146,22 +161,22 @@ private:
   PMDataManager &PM;
 };
 
-/// getAnalysisToUpdate<AnalysisType>() - This function is used by subclasses
-/// to get to the analysis information that might be around that needs to be
-/// updated.  This is different than getAnalysis in that it can fail (ie the
-/// analysis results haven't been computed), so should only be used if you
-/// provide the capability to update an analysis that exists.  This method is
-/// often used by transformation APIs to update analysis results for a pass
-/// automatically as the transform is performed.
+/// getAnalysisIfAvailable<AnalysisType>() - Subclasses use this function to
+/// get analysis information that might be around, for example to update it.
+/// This is different than getAnalysis in that it can fail (if the analysis
+/// results haven't been computed), so should only be used if you can handle
+/// the case when the analysis is not available.  This method is often used by
+/// transformation APIs to update analysis results for a pass automatically as
+/// the transform is performed.
 ///
 template<typename AnalysisType>
-AnalysisType *Pass::getAnalysisToUpdate() const {
+AnalysisType *Pass::getAnalysisIfAvailable() const {
   assert(Resolver && "Pass not resident in a PassManager object!");
 
   const PassInfo *PI = getClassPassInfo<AnalysisType>();
   if (PI == 0) return 0;
   return dynamic_cast<AnalysisType*>
-    (Resolver->getAnalysisToUpdate(PI, true));
+    (Resolver->getAnalysisIfAvailable(PI, true));
 }
 
 /// getAnalysis<AnalysisType>() - This function is used by subclasses to get
@@ -197,6 +212,37 @@ AnalysisType &Pass::getAnalysisID(const PassInfo *PI) const {
   return *Result;
 }
 
+/// getAnalysis<AnalysisType>() - This function is used by subclasses to get
+/// to the analysis information that they claim to use by overriding the
+/// getAnalysisUsage function.
+///
+template<typename AnalysisType>
+AnalysisType &Pass::getAnalysis(Function &F) {
+  assert(Resolver &&"Pass has not been inserted into a PassManager object!");
+
+  return getAnalysisID<AnalysisType>(getClassPassInfo<AnalysisType>(), F);
+}
+
+template<typename AnalysisType>
+AnalysisType &Pass::getAnalysisID(const PassInfo *PI, Function &F) {
+  assert(PI && "getAnalysis for unregistered pass!");
+  assert(Resolver && "Pass has not been inserted into a PassManager object!");
+  // PI *must* appear in AnalysisImpls.  Because the number of passes used
+  // should be a small number, we just do a linear search over a (dense)
+  // vector.
+  Pass *ResultPass = Resolver->findImplPass(this, PI, F);
+  assert (ResultPass &&  "Unable to find requested analysis info");
+  
+  // Because the AnalysisType may not be a subclass of pass (for
+  // AnalysisGroups), we must use dynamic_cast here to potentially adjust the
+  // return pointer (because the class may multiply inherit, once from pass,
+  // once from AnalysisType).
+  //
+  AnalysisType *Result = dynamic_cast<AnalysisType*>(ResultPass);
+  assert(Result && "Pass does not implement interface required!");
+  return *Result;
+}
+
 } // End llvm namespace
 
 #endif