-//===- SwapStructContents.cpp - Swap structure elements around ---*- C++ -*--=//
+//===- SimpleStructMutation.cpp - Swap structure elements around -*- C++ -*--=//
//
// This pass does a simple transformation that swaps all of the elements of the
// struct types in the program around.
//
//===----------------------------------------------------------------------===//
-
-#include "llvm/Transforms/SwapStructContents.h"
-#include "llvm/Transforms/MutateStructTypes.h"
+#include "llvm/Transforms/IPO.h"
+#include "llvm/Transforms/IPO/MutateStructTypes.h"
#include "llvm/Analysis/FindUsedTypes.h"
#include "llvm/Analysis/FindUnsafePointerTypes.h"
+#include "llvm/Target/TargetData.h"
#include "llvm/DerivedTypes.h"
+#include <algorithm>
+using std::vector;
+using std::set;
+using std::pair;
+
+namespace {
+ struct SimpleStructMutation : public MutateStructTypes {
+ enum Transform { SwapElements, SortElements };
+
+ virtual bool run(Module &M) = 0;
+
+ // getAnalysisUsage - This function needs the results of the
+ // FindUsedTypes and FindUnsafePointerTypes analysis passes...
+ //
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addRequired<TargetData>();
+ AU.addRequired<FindUsedTypes>();
+ AU.addRequired<FindUnsafePointerTypes>();
+ MutateStructTypes::getAnalysisUsage(AU);
+ }
+
+ protected:
+ TransformsType getTransforms(Module &M, enum Transform);
+ };
+
+ struct SwapStructElements : public SimpleStructMutation {
+ virtual bool run(Module &M) {
+ setTransforms(getTransforms(M, SwapElements));
+ bool Changed = MutateStructTypes::run(M);
+ clearTransforms();
+ return Changed;
+ }
+ };
+
+ struct SortStructElements : public SimpleStructMutation {
+ virtual bool run(Module &M) {
+ setTransforms(getTransforms(M, SortElements));
+ bool Changed = MutateStructTypes::run(M);
+ clearTransforms();
+ return Changed;
+ }
+ };
+
+ RegisterOpt<SwapStructElements> X("swapstructs",
+ "Swap structure types around");
+ RegisterOpt<SortStructElements> Y("sortstructs",
+ "Sort structure elements by size");
+} // end anonymous namespace
+
+Pass *createSwapElementsPass() { return new SwapStructElements(); }
+Pass *createSortElementsPass() { return new SortStructElements(); }
-#include "llvm/Assembly/Writer.h"
// PruneTypes - Given a type Ty, make sure that neither it, or one of its
// subtypes, occur in TypesToModify.
// If the element is in TypesToModify, remove it now...
if (const StructType *ST = dyn_cast<StructType>(Ty)) {
TypesToModify.erase(ST); // This doesn't fail if the element isn't present
- cerr << "Unable to swap type: " << ST << endl;
+ std::cerr << "Unable to swap type: " << ST << "\n";
}
// Remove all types that this type contains as well... do not remove types
}
}
+static bool FirstLess(const pair<unsigned, unsigned> &LHS,
+ const pair<unsigned, unsigned> &RHS) {
+ return LHS.second < RHS.second;
+}
+static unsigned getIndex(const vector<pair<unsigned, unsigned> > &Vec,
+ unsigned Field) {
+ for (unsigned i = 0; ; ++i)
+ if (Vec[i].first == Field) return i;
+}
-// doPassInitialization - This does all of the work of the pass
-//
-bool SwapStructContents::doPassInitialization(Module *M) {
- // We need to know which types to modify, and which types we CAN'T modify
- FindUsedTypes FUT/*(true)*/; // TODO: Do symbol tables as well
- FindUnsafePointerTypes FUPT;
+static inline void GetTransformation(const TargetData &TD, const StructType *ST,
+ vector<int> &Transform,
+ enum SimpleStructMutation::Transform XForm) {
+ unsigned NumElements = ST->getElementTypes().size();
+ Transform.reserve(NumElements);
- // Simutaneously find all of the types used, and all of the types that aren't
- // safe.
- //
- vector<Pass*> Analyses;
- Analyses.push_back(&FUT);
- Analyses.push_back(&FUPT);
- Pass::runAllPasses(M, Analyses); // Do analyses
+ switch (XForm) {
+ case SimpleStructMutation::SwapElements:
+ // The transformation to do is: just simply swap the elements
+ for (unsigned i = 0; i < NumElements; ++i)
+ Transform.push_back(NumElements-i-1);
+ break;
+
+ case SimpleStructMutation::SortElements: {
+ vector<pair<unsigned, unsigned> > ElList;
+
+ // Build mapping from index to size
+ for (unsigned i = 0; i < NumElements; ++i)
+ ElList.push_back(
+ std::make_pair(i, TD.getTypeSize(ST->getElementTypes()[i])));
+ sort(ElList.begin(), ElList.end(), ptr_fun(FirstLess));
+
+ for (unsigned i = 0; i < NumElements; ++i)
+ Transform.push_back(getIndex(ElList, i));
+
+ break;
+ }
+ }
+}
+
+
+SimpleStructMutation::TransformsType
+ SimpleStructMutation::getTransforms(Module &, enum Transform XForm) {
+ // We need to know which types to modify, and which types we CAN'T modify
+ // TODO: Do symbol tables as well
// Get the results out of the analyzers...
- const set<PointerType*> &UnsafePTys = FUPT.getUnsafeTypes();
+ FindUsedTypes &FUT = getAnalysis<FindUsedTypes>();
const set<const Type *> &UsedTypes = FUT.getTypes();
+ FindUnsafePointerTypes &FUPT = getAnalysis<FindUnsafePointerTypes>();
+ const set<PointerType*> &UnsafePTys = FUPT.getUnsafeTypes();
+
+
// Combine the two sets, weeding out non structure types. Closures in C++
// sure would be nice.
set<const Type*> ProcessedTypes;
for (set<PointerType*>::const_iterator I = UnsafePTys.begin(),
E = UnsafePTys.end(); I != E; ++I) {
- cerr << "Pruning type: " << *I << endl;
+ //cerr << "Pruning type: " << *I << "\n";
PruneTypes(*I, TypesToModify, ProcessedTypes);
}
// Build up a set of structure types that we are going to modify, and
// information describing how to modify them.
- map<const StructType*, vector<int> > Transforms;
+ std::map<const StructType*, vector<int> > Transforms;
+ TargetData &TD = getAnalysis<TargetData>();
for (set<const StructType*>::iterator I = TypesToModify.begin(),
E = TypesToModify.end(); I != E; ++I) {
const StructType *ST = *I;
- unsigned NumElements = ST->getElementTypes().size();
vector<int> &Transform = Transforms[ST]; // Fill in the map directly
- Transform.reserve(NumElements);
-
- // The transformation to do is: just simply swap the elements
- for (unsigned i = 0; i < NumElements; ++i)
- Transform.push_back(NumElements-i-1);
+ GetTransformation(TD, ST, Transform, XForm);
}
- // Create the Worker to do our stuff for us...
- StructMutator = new MutateStructTypes(Transforms);
-
- // Do initial work.
- return StructMutator->doPassInitialization(M);
+ return Transforms;
}
-
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