mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3932 91177308-0d34-0410-b5e6-96231b3b80d8
184 lines
6.1 KiB
C++
184 lines
6.1 KiB
C++
//===- SimpleStructMutation.cpp - Swap structure elements around -*- C++ -*--=//
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//
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// This pass does a simple transformation that swaps all of the elements of the
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// struct types in the program around.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Transforms/IPO/MutateStructTypes.h"
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#include "llvm/Analysis/FindUsedTypes.h"
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#include "llvm/Analysis/FindUnsafePointerTypes.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/DerivedTypes.h"
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#include <algorithm>
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using std::vector;
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using std::set;
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using std::pair;
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namespace {
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struct SimpleStructMutation : public MutateStructTypes {
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enum Transform { SwapElements, SortElements };
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virtual bool run(Module &M) = 0;
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// getAnalysisUsage - This function needs the results of the
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// FindUsedTypes and FindUnsafePointerTypes analysis passes...
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//
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<TargetData>();
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AU.addRequired<FindUsedTypes>();
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AU.addRequired<FindUnsafePointerTypes>();
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MutateStructTypes::getAnalysisUsage(AU);
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}
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protected:
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TransformsType getTransforms(Module &M, enum Transform);
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};
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struct SwapStructElements : public SimpleStructMutation {
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virtual bool run(Module &M) {
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setTransforms(getTransforms(M, SwapElements));
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bool Changed = MutateStructTypes::run(M);
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clearTransforms();
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return Changed;
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}
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};
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struct SortStructElements : public SimpleStructMutation {
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virtual bool run(Module &M) {
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setTransforms(getTransforms(M, SortElements));
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bool Changed = MutateStructTypes::run(M);
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clearTransforms();
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return Changed;
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}
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};
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RegisterOpt<SwapStructElements> X("swapstructs",
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"Swap structure types around");
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RegisterOpt<SortStructElements> Y("sortstructs",
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"Sort structure elements by size");
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} // end anonymous namespace
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Pass *createSwapElementsPass() { return new SwapStructElements(); }
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Pass *createSortElementsPass() { return new SortStructElements(); }
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// PruneTypes - Given a type Ty, make sure that neither it, or one of its
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// subtypes, occur in TypesToModify.
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//
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static void PruneTypes(const Type *Ty, set<const StructType*> &TypesToModify,
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set<const Type*> &ProcessedTypes) {
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if (ProcessedTypes.count(Ty)) return; // Already been checked
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ProcessedTypes.insert(Ty);
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// If the element is in TypesToModify, remove it now...
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if (const StructType *ST = dyn_cast<StructType>(Ty)) {
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TypesToModify.erase(ST); // This doesn't fail if the element isn't present
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std::cerr << "Unable to swap type: " << ST << "\n";
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}
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// Remove all types that this type contains as well... do not remove types
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// that are referenced only through pointers, because we depend on the size of
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// the pointer, not on what the structure points to.
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//
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for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end();
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I != E; ++I) {
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if (!isa<PointerType>(*I))
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PruneTypes(*I, TypesToModify, ProcessedTypes);
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}
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}
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static bool FirstLess(const pair<unsigned, unsigned> &LHS,
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const pair<unsigned, unsigned> &RHS) {
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return LHS.second < RHS.second;
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}
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static unsigned getIndex(const vector<pair<unsigned, unsigned> > &Vec,
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unsigned Field) {
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for (unsigned i = 0; ; ++i)
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if (Vec[i].first == Field) return i;
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}
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static inline void GetTransformation(const TargetData &TD, const StructType *ST,
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vector<int> &Transform,
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enum SimpleStructMutation::Transform XForm) {
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unsigned NumElements = ST->getElementTypes().size();
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Transform.reserve(NumElements);
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switch (XForm) {
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case SimpleStructMutation::SwapElements:
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// The transformation to do is: just simply swap the elements
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for (unsigned i = 0; i < NumElements; ++i)
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Transform.push_back(NumElements-i-1);
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break;
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case SimpleStructMutation::SortElements: {
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vector<pair<unsigned, unsigned> > ElList;
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// Build mapping from index to size
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for (unsigned i = 0; i < NumElements; ++i)
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ElList.push_back(
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std::make_pair(i, TD.getTypeSize(ST->getElementTypes()[i])));
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sort(ElList.begin(), ElList.end(), ptr_fun(FirstLess));
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for (unsigned i = 0; i < NumElements; ++i)
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Transform.push_back(getIndex(ElList, i));
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break;
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}
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}
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}
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SimpleStructMutation::TransformsType
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SimpleStructMutation::getTransforms(Module &, enum Transform XForm) {
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// We need to know which types to modify, and which types we CAN'T modify
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// TODO: Do symbol tables as well
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// Get the results out of the analyzers...
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FindUsedTypes &FUT = getAnalysis<FindUsedTypes>();
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const set<const Type *> &UsedTypes = FUT.getTypes();
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FindUnsafePointerTypes &FUPT = getAnalysis<FindUnsafePointerTypes>();
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const set<PointerType*> &UnsafePTys = FUPT.getUnsafeTypes();
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// Combine the two sets, weeding out non structure types. Closures in C++
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// sure would be nice.
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set<const StructType*> TypesToModify;
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for (set<const Type *>::const_iterator I = UsedTypes.begin(),
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E = UsedTypes.end(); I != E; ++I)
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if (const StructType *ST = dyn_cast<StructType>(*I))
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TypesToModify.insert(ST);
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// Go through the Unsafe types and remove all types from TypesToModify that we
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// are not allowed to modify, because that would be unsafe.
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//
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set<const Type*> ProcessedTypes;
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for (set<PointerType*>::const_iterator I = UnsafePTys.begin(),
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E = UnsafePTys.end(); I != E; ++I) {
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//cerr << "Pruning type: " << *I << "\n";
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PruneTypes(*I, TypesToModify, ProcessedTypes);
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}
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// Build up a set of structure types that we are going to modify, and
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// information describing how to modify them.
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std::map<const StructType*, vector<int> > Transforms;
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TargetData &TD = getAnalysis<TargetData>();
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for (set<const StructType*>::iterator I = TypesToModify.begin(),
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E = TypesToModify.end(); I != E; ++I) {
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const StructType *ST = *I;
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vector<int> &Transform = Transforms[ST]; // Fill in the map directly
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GetTransformation(TD, ST, Transform, XForm);
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}
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return Transforms;
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}
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