#include "llvm/Assembly/Writer.h"
#include "llvm/Support/Streams.h"
#include "llvm/System/Path.h"
+#include "llvm/ADT/DenseMap.h"
#include <sstream>
using namespace llvm;
return false;
}
-static const FunctionType *getFT(const PATypeHolder &TH) {
- return cast<FunctionType>(TH.get());
-}
-static const StructType *getST(const PATypeHolder &TH) {
- return cast<StructType>(TH.get());
+/// LinkerTypeMap - This implements a map of types that is stable
+/// even if types are resolved/refined to other types. This is not a general
+/// purpose map, it is specific to the linker's use.
+namespace {
+class LinkerTypeMap : public AbstractTypeUser {
+ typedef DenseMap<const Type*, PATypeHolder> TheMapTy;
+ TheMapTy TheMap;
+
+ LinkerTypeMap(const LinkerTypeMap&); // DO NOT IMPLEMENT
+ void operator=(const LinkerTypeMap&); // DO NOT IMPLEMENT
+public:
+ LinkerTypeMap() {}
+ ~LinkerTypeMap() {
+ for (DenseMap<const Type*, PATypeHolder>::iterator I = TheMap.begin(),
+ E = TheMap.end(); I != E; ++I)
+ I->first->removeAbstractTypeUser(this);
+ }
+
+ /// lookup - Return the value for the specified type or null if it doesn't
+ /// exist.
+ const Type *lookup(const Type *Ty) const {
+ TheMapTy::const_iterator I = TheMap.find(Ty);
+ if (I != TheMap.end()) return I->second;
+ return 0;
+ }
+
+ /// erase - Remove the specified type, returning true if it was in the set.
+ bool erase(const Type *Ty) {
+ if (!TheMap.erase(Ty))
+ return false;
+ if (Ty->isAbstract())
+ Ty->removeAbstractTypeUser(this);
+ return true;
+ }
+
+ /// insert - This returns true if the pointer was new to the set, false if it
+ /// was already in the set.
+ bool insert(const Type *Src, const Type *Dst) {
+ if (!TheMap.insert(std::make_pair(Src, PATypeHolder(Dst))))
+ return false; // Already in map.
+ if (Src->isAbstract())
+ Src->addAbstractTypeUser(this);
+ return true;
+ }
+
+protected:
+ /// refineAbstractType - The callback method invoked when an abstract type is
+ /// resolved to another type. An object must override this method to update
+ /// its internal state to reference NewType instead of OldType.
+ ///
+ virtual void refineAbstractType(const DerivedType *OldTy,
+ const Type *NewTy) {
+ TheMapTy::iterator I = TheMap.find(OldTy);
+ const Type *DstTy = I->second;
+
+ TheMap.erase(I);
+ if (OldTy->isAbstract())
+ OldTy->removeAbstractTypeUser(this);
+
+ // Don't reinsert into the map if the key is concrete now.
+ if (NewTy->isAbstract())
+ insert(NewTy, DstTy);
+ }
+
+ /// The other case which AbstractTypeUsers must be aware of is when a type
+ /// makes the transition from being abstract (where it has clients on it's
+ /// AbstractTypeUsers list) to concrete (where it does not). This method
+ /// notifies ATU's when this occurs for a type.
+ virtual void typeBecameConcrete(const DerivedType *AbsTy) {
+ TheMap.erase(AbsTy);
+ AbsTy->removeAbstractTypeUser(this);
+ }
+
+ // for debugging...
+ virtual void dump() const {
+ cerr << "AbstractTypeSet!\n";
+ }
+};
}
+
// RecursiveResolveTypes - This is just like ResolveTypes, except that it
// recurses down into derived types, merging the used types if the parent types
// are compatible.
-static bool RecursiveResolveTypesI(const PATypeHolder &DestTy,
- const PATypeHolder &SrcTy,
- std::vector<std::pair<PATypeHolder, PATypeHolder> > &Pointers) {
- const Type *SrcTyT = SrcTy.get();
- const Type *DestTyT = DestTy.get();
- if (DestTyT == SrcTyT) return false; // If already equal, noop
+static bool RecursiveResolveTypesI(const Type *DstTy, const Type *SrcTy,
+ LinkerTypeMap &Pointers) {
+ if (DstTy == SrcTy) return false; // If already equal, noop
// If we found our opaque type, resolve it now!
- if (isa<OpaqueType>(DestTyT) || isa<OpaqueType>(SrcTyT))
- return ResolveTypes(DestTyT, SrcTyT);
+ if (isa<OpaqueType>(DstTy) || isa<OpaqueType>(SrcTy))
+ return ResolveTypes(DstTy, SrcTy);
// Two types cannot be resolved together if they are of different primitive
// type. For example, we cannot resolve an int to a float.
- if (DestTyT->getTypeID() != SrcTyT->getTypeID()) return true;
+ if (DstTy->getTypeID() != SrcTy->getTypeID()) return true;
+ // If neither type is abstract, then they really are just different types.
+ if (!DstTy->isAbstract() && !SrcTy->isAbstract())
+ return true;
+
// Otherwise, resolve the used type used by this derived type...
- switch (DestTyT->getTypeID()) {
- case Type::IntegerTyID: {
- if (cast<IntegerType>(DestTyT)->getBitWidth() !=
- cast<IntegerType>(SrcTyT)->getBitWidth())
- return true;
- return false;
- }
+ switch (DstTy->getTypeID()) {
+ default:
+ return true;
case Type::FunctionTyID: {
- if (cast<FunctionType>(DestTyT)->isVarArg() !=
- cast<FunctionType>(SrcTyT)->isVarArg() ||
- cast<FunctionType>(DestTyT)->getNumContainedTypes() !=
- cast<FunctionType>(SrcTyT)->getNumContainedTypes())
+ const FunctionType *DstFT = cast<FunctionType>(DstTy);
+ const FunctionType *SrcFT = cast<FunctionType>(SrcTy);
+ if (DstFT->isVarArg() != SrcFT->isVarArg() ||
+ DstFT->getNumContainedTypes() != SrcFT->getNumContainedTypes())
return true;
- for (unsigned i = 0, e = getFT(DestTy)->getNumContainedTypes(); i != e; ++i)
- if (RecursiveResolveTypesI(getFT(DestTy)->getContainedType(i),
- getFT(SrcTy)->getContainedType(i), Pointers))
+
+ // Use TypeHolder's so recursive resolution won't break us.
+ PATypeHolder ST(SrcFT), DT(DstFT);
+ for (unsigned i = 0, e = DstFT->getNumContainedTypes(); i != e; ++i) {
+ const Type *SE = ST->getContainedType(i), *DE = DT->getContainedType(i);
+ if (SE != DE && RecursiveResolveTypesI(DE, SE, Pointers))
return true;
+ }
return false;
}
case Type::StructTyID: {
- if (getST(DestTy)->getNumContainedTypes() !=
- getST(SrcTy)->getNumContainedTypes()) return 1;
- for (unsigned i = 0, e = getST(DestTy)->getNumContainedTypes(); i != e; ++i)
- if (RecursiveResolveTypesI(getST(DestTy)->getContainedType(i),
- getST(SrcTy)->getContainedType(i), Pointers))
+ const StructType *DstST = cast<StructType>(DstTy);
+ const StructType *SrcST = cast<StructType>(SrcTy);
+ if (DstST->getNumContainedTypes() != SrcST->getNumContainedTypes())
+ return true;
+
+ PATypeHolder ST(SrcST), DT(DstST);
+ for (unsigned i = 0, e = DstST->getNumContainedTypes(); i != e; ++i) {
+ const Type *SE = ST->getContainedType(i), *DE = DT->getContainedType(i);
+ if (SE != DE && RecursiveResolveTypesI(DE, SE, Pointers))
return true;
+ }
return false;
}
case Type::ArrayTyID: {
- const ArrayType *DAT = cast<ArrayType>(DestTy.get());
- const ArrayType *SAT = cast<ArrayType>(SrcTy.get());
+ const ArrayType *DAT = cast<ArrayType>(DstTy);
+ const ArrayType *SAT = cast<ArrayType>(SrcTy);
if (DAT->getNumElements() != SAT->getNumElements()) return true;
return RecursiveResolveTypesI(DAT->getElementType(), SAT->getElementType(),
Pointers);
}
+ case Type::VectorTyID: {
+ const VectorType *DVT = cast<VectorType>(DstTy);
+ const VectorType *SVT = cast<VectorType>(SrcTy);
+ if (DVT->getNumElements() != SVT->getNumElements()) return true;
+ return RecursiveResolveTypesI(DVT->getElementType(), SVT->getElementType(),
+ Pointers);
+ }
case Type::PointerTyID: {
+ const PointerType *DstPT = cast<PointerType>(DstTy);
+ const PointerType *SrcPT = cast<PointerType>(SrcTy);
+
+ if (DstPT->getAddressSpace() != SrcPT->getAddressSpace())
+ return true;
+
// If this is a pointer type, check to see if we have already seen it. If
// so, we are in a recursive branch. Cut off the search now. We cannot use
// an associative container for this search, because the type pointers (keys
- // in the container) change whenever types get resolved...
- for (unsigned i = 0, e = Pointers.size(); i != e; ++i)
- if (Pointers[i].first == DestTy)
- return Pointers[i].second != SrcTy;
-
+ // in the container) change whenever types get resolved.
+ if (SrcPT->isAbstract())
+ if (const Type *ExistingDestTy = Pointers.lookup(SrcPT))
+ return ExistingDestTy != DstPT;
+
+ if (DstPT->isAbstract())
+ if (const Type *ExistingSrcTy = Pointers.lookup(DstPT))
+ return ExistingSrcTy != SrcPT;
// Otherwise, add the current pointers to the vector to stop recursion on
// this pair.
- Pointers.push_back(std::make_pair(DestTyT, SrcTyT));
- bool Result =
- RecursiveResolveTypesI(cast<PointerType>(DestTy.get())->getElementType(),
- cast<PointerType>(SrcTy.get())->getElementType(),
- Pointers);
- Pointers.pop_back();
- return Result;
+ if (DstPT->isAbstract())
+ Pointers.insert(DstPT, SrcPT);
+ if (SrcPT->isAbstract())
+ Pointers.insert(SrcPT, DstPT);
+
+ return RecursiveResolveTypesI(DstPT->getElementType(),
+ SrcPT->getElementType(), Pointers);
}
- default: assert(0 && "Unexpected type!"); return true;
}
}
-static bool RecursiveResolveTypes(const PATypeHolder &DestTy,
- const PATypeHolder &SrcTy) {
- std::vector<std::pair<PATypeHolder, PATypeHolder> > PointerTypes;
+static bool RecursiveResolveTypes(const Type *DestTy, const Type *SrcTy) {
+ LinkerTypeMap PointerTypes;
return RecursiveResolveTypesI(DestTy, SrcTy, PointerTypes);
}
// two types: { int* } and { opaque* }
for (unsigned i = 0, e = DelayedTypesToResolve.size(); i != e; ++i) {
const std::string &Name = DelayedTypesToResolve[i];
- PATypeHolder T1(SrcST->lookup(Name));
- PATypeHolder T2(DestST->lookup(Name));
-
- if (!RecursiveResolveTypes(T2, T1)) {
+ if (!RecursiveResolveTypes(SrcST->lookup(Name), DestST->lookup(Name))) {
// We are making progress!
DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i);
const Function *SF = I; // SrcFunction
Function *DF = 0;
+ Value *MappedDF;
// If this function is internal or has no name, it doesn't participate in
// linkage.
// Remember this mapping so uses in the source module get remapped
// later by RemapOperand.
ValueMap[SF] = NewDF;
- } else if (SF->isDeclaration()) {
- // We have two functions of the same name but different type and the
- // source is a declaration while the destination is not. Any use of
- // the source must be mapped to the destination, with a cast.
- ValueMap[SF] = ConstantExpr::getBitCast(DF, SF->getType());
+ continue;
} else {
- // We have two functions of the same name but different types and they
- // are both definitions. This is an error.
- return Error(Err, "Function '" + DF->getName() + "' defined as both '" +
- ToStr(SF->getFunctionType(), Src) + "' and '" +
- ToStr(DF->getFunctionType(), Dest) + "'");
+ // We have two functions of the same name but different type. Any use
+ // of the source must be mapped to the destination, with a cast.
+ MappedDF = ConstantExpr::getBitCast(DF, SF->getType());
}
- continue;
+ } else {
+ MappedDF = DF;
}
if (SF->isDeclaration()) {
// the declarations, we aren't adding anything.
if (SF->hasDLLImportLinkage()) {
if (DF->isDeclaration()) {
- ValueMap[SF] = DF;
+ ValueMap[SF] = MappedDF;
DF->setLinkage(SF->getLinkage());
}
} else {
- ValueMap[SF] = DF;
+ ValueMap[SF] = MappedDF;
}
continue;
}
// If DF is external but SF is not, link the external functions, update
// linkage qualifiers.
if (DF->isDeclaration() && !DF->hasDLLImportLinkage()) {
- ValueMap.insert(std::make_pair(SF, DF));
+ ValueMap.insert(std::make_pair(SF, MappedDF));
DF->setLinkage(SF->getLinkage());
continue;
}
// At this point we know that DF has LinkOnce, Weak, or External* linkage.
if (SF->hasWeakLinkage() || SF->hasLinkOnceLinkage() ||
SF->hasCommonLinkage()) {
- ValueMap[SF] = DF;
+ ValueMap[SF] = MappedDF;
// Linkonce+Weak = Weak
// *+External Weak = *
if (DF->hasWeakLinkage() || DF->hasLinkOnceLinkage() ||
DF->hasCommonLinkage()) {
// At this point we know that SF has LinkOnce or External* linkage.
- ValueMap[SF] = DF;
+ ValueMap[SF] = MappedDF;
// If the source function has stronger linkage than the destination,
// its body and linkage should override ours.
// go
for (Module::iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF) {
if (!SF->isDeclaration()) { // No body if function is external
- Function *DF = cast<Function>(ValueMap[SF]); // Destination function
+ Function *DF = dyn_cast<Function>(ValueMap[SF]); // Destination function
// DF not external SF external?
- if (DF->isDeclaration())
+ if (DF && DF->isDeclaration())
// Only provide the function body if there isn't one already.
if (LinkFunctionBody(DF, SF, ValueMap, Err))
return true;
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