mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-01 00:11:00 +00:00
7546c21ae1
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1248 91177308-0d34-0410-b5e6-96231b3b80d8
99 lines
3.4 KiB
C++
99 lines
3.4 KiB
C++
//===- SwapStructContents.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/Analysis/FindUsedTypes.h"
|
|
#include "llvm/Analysis/FindUnsafePointerTypes.h"
|
|
#include "llvm/DerivedTypes.h"
|
|
|
|
// PruneTypes - Given a type Ty, make sure that neither it, or one of its
|
|
// subtypes, occur in TypesToModify.
|
|
//
|
|
static void PruneTypes(const Type *Ty, set<const StructType*> &TypesToModify,
|
|
set<const Type*> &ProcessedTypes) {
|
|
if (ProcessedTypes.count(Ty)) return; // Already been checked
|
|
ProcessedTypes.insert(Ty);
|
|
|
|
// 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
|
|
|
|
// Remove all types that this type contains as well...
|
|
//
|
|
for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end();
|
|
I != E; ++I)
|
|
PruneTypes(*I, TypesToModify, ProcessedTypes);
|
|
}
|
|
|
|
|
|
|
|
// 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;
|
|
|
|
// 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
|
|
|
|
|
|
// Get the results out of the analyzers...
|
|
const set<PointerType*> &UnsafePTys = FUPT.getUnsafeTypes();
|
|
const set<const Type *> &UsedTypes = FUT.getTypes();
|
|
|
|
|
|
// Combine the two sets, weeding out non structure types. Closures should
|
|
// would be nice.
|
|
set<const StructType*> TypesToModify;
|
|
for (set<const Type *>::const_iterator I = UsedTypes.begin(),
|
|
E = UsedTypes.end(); I != E; ++I)
|
|
if (const StructType *ST = dyn_cast<StructType>(*I))
|
|
TypesToModify.insert(ST);
|
|
|
|
|
|
// Go through the Unsafe types and remove all types from TypesToModify that we
|
|
// are not allowed to modify, because that would be unsafe.
|
|
//
|
|
set<const Type*> ProcessedTypes;
|
|
for (set<PointerType*>::const_iterator I = UnsafePTys.begin(),
|
|
E = UnsafePTys.end(); I != E; ++I)
|
|
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;
|
|
|
|
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);
|
|
}
|
|
|
|
// Create the Worker to do our stuff for us...
|
|
StructMutator = new MutateStructTypes(Transforms);
|
|
|
|
// Do initial work.
|
|
return StructMutator->doPassInitialization(M);
|
|
}
|
|
|