#include "llvm/iOther.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Target/TargetData.h"
+#include "llvm/Assembly/Writer.h"
+#include "Support/Debug.h"
#include "Support/STLExtras.h"
#include "Support/Statistic.h"
#include "Support/Timer.h"
// DSNode Implementation
//===----------------------------------------------------------------------===//
-DSNode::DSNode(unsigned NT, const Type *T, DSGraph *G)
- : NumReferrers(0), Size(0), ParentGraph(G), Ty(Type::VoidTy), NodeType(NT) {
+DSNode::DSNode(const Type *T, DSGraph *G)
+ : NumReferrers(0), Size(0), ParentGraph(G), Ty(Type::VoidTy), NodeType(0) {
// Add the type entry if it is specified...
if (T) mergeTypeInfo(T, 0);
G->getNodes().push_back(this);
// DSNode copy constructor... do not copy over the referrers list!
DSNode::DSNode(const DSNode &N, DSGraph *G)
- : NumReferrers(0), Size(N.Size), ParentGraph(G), Ty(N.Ty),
- Links(N.Links), Globals(N.Globals), NodeType(N.NodeType) {
+ : NumReferrers(0), Size(N.Size), ParentGraph(G),
+ Ty(N.Ty), Links(N.Links), Globals(N.Globals), NodeType(N.NodeType) {
G->getNodes().push_back(this);
}
Ty == Type::VoidTy && (Size == 0 ||
(NodeType & DSNode::Array))) &&
"Node not OK!");
+
+ assert(ParentGraph && "Node has no parent?");
+ const DSGraph::ScalarMapTy &SM = ParentGraph->getScalarMap();
+ for (unsigned i = 0, e = Globals.size(); i != e; ++i) {
+ assert(SM.find(Globals[i]) != SM.end());
+ assert(SM.find(Globals[i])->second.getNode() == this);
+ }
}
/// forwardNode - Mark this node as being obsolete, and all references to it
/// single byte with a single TypeEntry of "void".
///
void DSNode::foldNodeCompletely() {
- assert(!hasNoReferrers() &&
- "Why would we collapse a node with no referrers?");
if (isNodeCompletelyFolded()) return; // If this node is already folded...
++NumFolds;
// Create the node we are going to forward to...
- DSNode *DestNode = new DSNode(NodeType|DSNode::Array, 0, ParentGraph);
+ DSNode *DestNode = new DSNode(0, ParentGraph);
+ DestNode->NodeType = NodeType|DSNode::Array;
DestNode->Ty = Type::VoidTy;
DestNode->Size = 1;
DestNode->Globals.swap(Globals);
}
+namespace {
+ /// TypeElementWalker Class - Used for implementation of physical subtyping...
+ ///
+ class TypeElementWalker {
+ struct StackState {
+ const Type *Ty;
+ unsigned Offset;
+ unsigned Idx;
+ StackState(const Type *T, unsigned Off = 0)
+ : Ty(T), Offset(Off), Idx(0) {}
+ };
+
+ std::vector<StackState> Stack;
+ public:
+ TypeElementWalker(const Type *T) {
+ Stack.push_back(T);
+ StepToLeaf();
+ }
+
+ bool isDone() const { return Stack.empty(); }
+ const Type *getCurrentType() const { return Stack.back().Ty; }
+ unsigned getCurrentOffset() const { return Stack.back().Offset; }
+
+ void StepToNextType() {
+ PopStackAndAdvance();
+ StepToLeaf();
+ }
+
+ private:
+ /// PopStackAndAdvance - Pop the current element off of the stack and
+ /// advance the underlying element to the next contained member.
+ void PopStackAndAdvance() {
+ assert(!Stack.empty() && "Cannot pop an empty stack!");
+ Stack.pop_back();
+ while (!Stack.empty()) {
+ StackState &SS = Stack.back();
+ if (const StructType *ST = dyn_cast<StructType>(SS.Ty)) {
+ ++SS.Idx;
+ if (SS.Idx != ST->getElementTypes().size()) {
+ const StructLayout *SL = TD.getStructLayout(ST);
+ SS.Offset += SL->MemberOffsets[SS.Idx]-SL->MemberOffsets[SS.Idx-1];
+ return;
+ }
+ Stack.pop_back(); // At the end of the structure
+ } else {
+ const ArrayType *AT = cast<ArrayType>(SS.Ty);
+ ++SS.Idx;
+ if (SS.Idx != AT->getNumElements()) {
+ SS.Offset += TD.getTypeSize(AT->getElementType());
+ return;
+ }
+ Stack.pop_back(); // At the end of the array
+ }
+ }
+ }
+
+ /// StepToLeaf - Used by physical subtyping to move to the first leaf node
+ /// on the type stack.
+ void StepToLeaf() {
+ if (Stack.empty()) return;
+ while (!Stack.empty() && !Stack.back().Ty->isFirstClassType()) {
+ StackState &SS = Stack.back();
+ if (const StructType *ST = dyn_cast<StructType>(SS.Ty)) {
+ if (ST->getElementTypes().empty()) {
+ assert(SS.Idx == 0);
+ PopStackAndAdvance();
+ } else {
+ // Step into the structure...
+ assert(SS.Idx < ST->getElementTypes().size());
+ const StructLayout *SL = TD.getStructLayout(ST);
+ Stack.push_back(StackState(ST->getElementTypes()[SS.Idx],
+ SS.Offset+SL->MemberOffsets[SS.Idx]));
+ }
+ } else {
+ const ArrayType *AT = cast<ArrayType>(SS.Ty);
+ if (AT->getNumElements() == 0) {
+ assert(SS.Idx == 0);
+ PopStackAndAdvance();
+ } else {
+ // Step into the array...
+ assert(SS.Idx < AT->getNumElements());
+ Stack.push_back(StackState(AT->getElementType(),
+ SS.Offset+SS.Idx*
+ TD.getTypeSize(AT->getElementType())));
+ }
+ }
+ }
+ }
+ };
+}
+
+/// ElementTypesAreCompatible - Check to see if the specified types are
+/// "physically" compatible. If so, return true, else return false. We only
+/// have to check the fields in T1: T2 may be larger than T1.
+///
+static bool ElementTypesAreCompatible(const Type *T1, const Type *T2) {
+ TypeElementWalker T1W(T1), T2W(T2);
+
+ while (!T1W.isDone() && !T2W.isDone()) {
+ if (T1W.getCurrentOffset() != T2W.getCurrentOffset())
+ return false;
+
+ const Type *T1 = T1W.getCurrentType();
+ const Type *T2 = T2W.getCurrentType();
+ if (T1 != T2 && !T1->isLosslesslyConvertibleTo(T2))
+ return false;
+
+ T1W.StepToNextType();
+ T2W.StepToNextType();
+ }
+
+ return T1W.isDone();
+}
+
+
/// mergeTypeInfo - This method merges the specified type into the current node
/// at the specified offset. This may update the current node's type record if
/// this gives more information to the node, it may do nothing to the node if
///
/// This method returns true if the node is completely folded, otherwise false.
///
-bool DSNode::mergeTypeInfo(const Type *NewTy, unsigned Offset) {
+bool DSNode::mergeTypeInfo(const Type *NewTy, unsigned Offset,
+ bool FoldIfIncompatible) {
// Check to make sure the Size member is up-to-date. Size can be one of the
// following:
// Size = 0, Ty = Void: Nothing is known about this node.
// It is illegal to grow this node if we have treated it as an array of
// objects...
if (isArray()) {
- foldNodeCompletely();
+ if (FoldIfIncompatible) foldNodeCompletely();
return true;
}
if (Offset) { // We could handle this case, but we don't for now...
- DEBUG(std::cerr << "UNIMP: Trying to merge a growth type into "
- << "offset != 0: Collapsing!\n");
- foldNodeCompletely();
+ std::cerr << "UNIMP: Trying to merge a growth type into "
+ << "offset != 0: Collapsing!\n";
+ if (FoldIfIncompatible) foldNodeCompletely();
return true;
}
break;
}
default:
- foldNodeCompletely();
+ if (FoldIfIncompatible) foldNodeCompletely();
return true;
}
}
// If we found our type exactly, early exit
if (SubType == NewTy) return false;
+ unsigned SubTypeSize = SubType->isSized() ? TD.getTypeSize(SubType) : 0;
+
+ // Ok, we are getting desperate now. Check for physical subtyping, where we
+ // just require each element in the node to be compatible.
+ if (NewTySize <= SubTypeSize && NewTySize && NewTySize < 256 &&
+ SubTypeSize && SubTypeSize < 256 &&
+ ElementTypesAreCompatible(NewTy, SubType))
+ return false;
+
// Okay, so we found the leader type at the offset requested. Search the list
// of types that starts at this offset. If SubType is currently an array or
// structure, the type desired may actually be the first element of the
// composite type...
//
- unsigned SubTypeSize = SubType->isSized() ? TD.getTypeSize(SubType) : 0;
unsigned PadSize = SubTypeSize; // Size, including pad memory which is ignored
while (SubType != NewTy) {
const Type *NextSubType = 0;
// Check to see if we have a compatible, but different type...
if (NewTySize == SubTypeSize) {
- // Check to see if this type is obviously convertable... int -> uint f.e.
- if (NewTy->isLosslesslyConvertableTo(SubType))
+ // Check to see if this type is obviously convertible... int -> uint f.e.
+ if (NewTy->isLosslesslyConvertibleTo(SubType))
return false;
// Check to see if we have a pointer & integer mismatch going on here,
return false;
}
+ Module *M = 0;
+ if (getParentGraph()->getReturnNodes().size())
+ M = getParentGraph()->getReturnNodes().begin()->first->getParent();
+ DEBUG(std::cerr << "MergeTypeInfo Folding OrigTy: ";
+ WriteTypeSymbolic(std::cerr, Ty, M) << "\n due to:";
+ WriteTypeSymbolic(std::cerr, NewTy, M) << " @ " << Offset << "!\n"
+ << "SubType: ";
+ WriteTypeSymbolic(std::cerr, SubType, M) << "\n\n");
- DEBUG(std::cerr << "MergeTypeInfo Folding OrigTy: " << Ty
- << "\n due to:" << NewTy << " @ " << Offset << "!\n"
- << "SubType: " << SubType << "\n\n");
-
- foldNodeCompletely();
+ if (FoldIfIncompatible) foldNodeCompletely();
return true;
}
unsigned NOffset = CurNodeH.getOffset()-NH.getOffset();
unsigned NSize = NH.getNode()->getSize();
- // Merge the type entries of the two nodes together...
+ // If the two nodes are of different size, and the smaller node has the array
+ // bit set, collapse!
+ if (NSize != CurNodeH.getNode()->getSize()) {
+ if (NSize < CurNodeH.getNode()->getSize()) {
+ if (NH.getNode()->isArray())
+ NH.getNode()->foldNodeCompletely();
+ } else if (CurNodeH.getNode()->isArray()) {
+ NH.getNode()->foldNodeCompletely();
+ }
+ }
+
+ // Merge the type entries of the two nodes together...
if (NH.getNode()->Ty != Type::VoidTy)
CurNodeH.getNode()->mergeTypeInfo(NH.getNode()->Ty, NOffset);
- assert((CurNodeH.getNode()->NodeType & DSNode::DEAD) == 0);
+ assert(!CurNodeH.getNode()->isDeadNode());
// If we are merging a node with a completely folded node, then both nodes are
// now completely folded.
DSNode *N = NH.getNode();
if (CurNodeH.getNode() == N || N == 0) return;
- assert((CurNodeH.getNode()->NodeType & DSNode::DEAD) == 0);
+ assert(!CurNodeH.getNode()->isDeadNode());
- // Start forwarding to the new node!
+ // Merge the NodeType information...
CurNodeH.getNode()->NodeType |= N->NodeType;
+
+ // Start forwarding to the new node!
N->forwardNode(CurNodeH.getNode(), NOffset);
- assert((CurNodeH.getNode()->NodeType & DSNode::DEAD) == 0);
+ assert(!CurNodeH.getNode()->isDeadNode());
// Make all of the outgoing links of N now be outgoing links of CurNodeH.
//
if (N == 0 || (N == this && NH.getOffset() == Offset))
return; // Noop
- assert((N->NodeType & DSNode::DEAD) == 0);
- assert((NodeType & DSNode::DEAD) == 0);
+ assert(!N->isDeadNode() && !isDeadNode());
assert(!hasNoReferrers() && "Should not try to fold a useless node!");
if (N == this) {
// DSGraph Implementation
//===----------------------------------------------------------------------===//
-DSGraph::DSGraph(const DSGraph &G) : Func(G.Func), GlobalsGraph(0) {
+/// getFunctionNames - Return a space separated list of the name of the
+/// functions in this graph (if any)
+std::string DSGraph::getFunctionNames() const {
+ switch (getReturnNodes().size()) {
+ case 0: return "Globals graph";
+ case 1: return getReturnNodes().begin()->first->getName();
+ default:
+ std::string Return;
+ for (DSGraph::ReturnNodesTy::const_iterator I = getReturnNodes().begin();
+ I != getReturnNodes().end(); ++I)
+ Return += I->first->getName() + " ";
+ Return.erase(Return.end()-1, Return.end()); // Remove last space character
+ return Return;
+ }
+}
+
+
+DSGraph::DSGraph(const DSGraph &G) : GlobalsGraph(0) {
PrintAuxCalls = false;
- hash_map<const DSNode*, DSNodeHandle> NodeMap;
- RetNode = cloneInto(G, ScalarMap, NodeMap);
+ NodeMapTy NodeMap;
+ cloneInto(G, ScalarMap, ReturnNodes, NodeMap);
+ InlinedGlobals.clear(); // clear set of "up-to-date" globals
}
-DSGraph::DSGraph(const DSGraph &G,
- hash_map<const DSNode*, DSNodeHandle> &NodeMap)
- : Func(G.Func), GlobalsGraph(0) {
+DSGraph::DSGraph(const DSGraph &G, NodeMapTy &NodeMap)
+ : GlobalsGraph(0) {
PrintAuxCalls = false;
- RetNode = cloneInto(G, ScalarMap, NodeMap);
+ cloneInto(G, ScalarMap, ReturnNodes, NodeMap);
+ InlinedGlobals.clear(); // clear set of "up-to-date" globals
}
DSGraph::~DSGraph() {
FunctionCalls.clear();
AuxFunctionCalls.clear();
+ InlinedGlobals.clear();
ScalarMap.clear();
- RetNode.setNode(0);
+ ReturnNodes.clear();
// Drop all intra-node references, so that assertions don't fail...
std::for_each(Nodes.begin(), Nodes.end(),
/// remapLinks - Change all of the Links in the current node according to the
/// specified mapping.
///
-void DSNode::remapLinks(hash_map<const DSNode*, DSNodeHandle> &OldNodeMap) {
+void DSNode::remapLinks(DSGraph::NodeMapTy &OldNodeMap) {
for (unsigned i = 0, e = Links.size(); i != e; ++i) {
DSNodeHandle &H = OldNodeMap[Links[i].getNode()];
Links[i].setNode(H.getNode());
}
-// cloneInto - Clone the specified DSGraph into the current graph, returning the
-// Return node of the graph. The translated ScalarMap for the old function is
-// filled into the OldValMap member. If StripAllocas is set to true, Alloca
-// markers are removed from the graph, as the graph is being cloned into a
-// calling function's graph.
-//
-DSNodeHandle DSGraph::cloneInto(const DSGraph &G,
- hash_map<Value*, DSNodeHandle> &OldValMap,
- hash_map<const DSNode*, DSNodeHandle> &OldNodeMap,
- unsigned CloneFlags) {
+/// cloneReachableNodes - Clone all reachable nodes from *Node into the
+/// current graph. This is a recursive function. The map OldNodeMap is a
+/// map from the original nodes to their clones.
+///
+void DSGraph::cloneReachableNodes(const DSNode* Node,
+ unsigned BitsToClear,
+ NodeMapTy& OldNodeMap,
+ NodeMapTy& CompletedNodeMap) {
+ if (CompletedNodeMap.find(Node) != CompletedNodeMap.end())
+ return;
+
+ DSNodeHandle& NH = OldNodeMap[Node];
+ if (NH.getNode() != NULL)
+ return;
+
+ // else Node has not yet been cloned: clone it and clear the specified bits
+ NH = new DSNode(*Node, this); // enters in OldNodeMap
+ NH.getNode()->maskNodeTypes(~BitsToClear);
+
+ // now recursively clone nodes pointed to by this node
+ for (unsigned i = 0, e = Node->getNumLinks(); i != e; ++i) {
+ const DSNodeHandle &Link = Node->getLink(i << DS::PointerShift);
+ if (const DSNode* nextNode = Link.getNode())
+ cloneReachableNodes(nextNode, BitsToClear, OldNodeMap, CompletedNodeMap);
+ }
+}
+
+void DSGraph::cloneReachableSubgraph(const DSGraph& G,
+ const hash_set<const DSNode*>& RootNodes,
+ NodeMapTy& OldNodeMap,
+ NodeMapTy& CompletedNodeMap,
+ unsigned CloneFlags) {
+ if (RootNodes.empty())
+ return;
+
+ assert(OldNodeMap.empty() && "Returned OldNodeMap should be empty!");
+ assert(&G != this && "Cannot clone graph into itself!");
+ assert((*RootNodes.begin())->getParentGraph() == &G &&
+ "Root nodes do not belong to this graph!");
+
+ // Remove alloca or mod/ref bits as specified...
+ unsigned BitsToClear = ((CloneFlags & StripAllocaBit)? DSNode::AllocaNode : 0)
+ | ((CloneFlags & StripModRefBits)? (DSNode::Modified | DSNode::Read) : 0)
+ | ((CloneFlags & StripIncompleteBit)? DSNode::Incomplete : 0);
+ BitsToClear |= DSNode::DEAD; // Clear dead flag...
+
+ // Clone all nodes reachable from each root node, using a recursive helper
+ for (hash_set<const DSNode*>::const_iterator I = RootNodes.begin(),
+ E = RootNodes.end(); I != E; ++I)
+ cloneReachableNodes(*I, BitsToClear, OldNodeMap, CompletedNodeMap);
+
+ // Merge the map entries in OldNodeMap and CompletedNodeMap to remap links
+ NodeMapTy MergedMap(OldNodeMap);
+ MergedMap.insert(CompletedNodeMap.begin(), CompletedNodeMap.end());
+
+ // Rewrite the links in the newly created nodes (the nodes in OldNodeMap)
+ // to point into the current graph. MergedMap gives the full mapping.
+ for (NodeMapTy::iterator I=OldNodeMap.begin(), E=OldNodeMap.end(); I!= E; ++I)
+ I->second.getNode()->remapLinks(MergedMap);
+
+ // Now merge cloned global nodes with their copies in the current graph
+ // Just look through OldNodeMap to find such nodes!
+ for (NodeMapTy::iterator I=OldNodeMap.begin(), E=OldNodeMap.end(); I!= E; ++I)
+ if (I->first->isGlobalNode()) {
+ DSNodeHandle &GClone = I->second;
+ assert(GClone.getNode() != NULL && "NULL node in OldNodeMap?");
+ const std::vector<GlobalValue*> &Globals = I->first->getGlobals();
+ for (unsigned gi = 0, ge = Globals.size(); gi != ge; ++gi) {
+ DSNodeHandle &GH = ScalarMap[Globals[gi]];
+ GH.mergeWith(GClone);
+ }
+ }
+}
+
+
+/// updateFromGlobalGraph - This function rematerializes global nodes and
+/// nodes reachable from them from the globals graph into the current graph.
+/// It invokes cloneReachableSubgraph, using the globals in the current graph
+/// as the roots. It also uses the vector InlinedGlobals to avoid cloning and
+/// merging globals that are already up-to-date in the current graph. In
+/// practice, in the TD pass, this is likely to be a large fraction of the
+/// live global nodes in each function (since most live nodes are likely to
+/// have been brought up-to-date in at _some_ caller or callee).
+///
+void DSGraph::updateFromGlobalGraph() {
+
+ // Use a map to keep track of the mapping between nodes in the globals graph
+ // and this graph for up-to-date global nodes, which do not need to be cloned.
+ NodeMapTy CompletedMap;
+
+ // Put the live, non-up-to-date global nodes into a set and the up-to-date
+ // ones in the map above, mapping node in GlobalsGraph to the up-to-date node.
+ hash_set<const DSNode*> GlobalNodeSet;
+ for (ScalarMapTy::const_iterator I = getScalarMap().begin(),
+ E = getScalarMap().end(); I != E; ++I)
+ if (GlobalValue* GV = dyn_cast<GlobalValue>(I->first)) {
+ DSNode* GNode = I->second.getNode();
+ assert(GNode && "No node for live global in current Graph?");
+ if (const DSNode* GGNode = GlobalsGraph->ScalarMap[GV].getNode())
+ if (InlinedGlobals.count(GV) == 0) // GNode is not up-to-date
+ GlobalNodeSet.insert(GGNode);
+ else { // GNode is up-to-date
+ CompletedMap[GGNode] = I->second;
+ assert(GGNode->getNumLinks() == GNode->getNumLinks() &&
+ "Links dont match in a node that is supposed to be up-to-date?"
+ "\nremapLinks() will not work if the links don't match!");
+ }
+ }
+
+ // Clone the subgraph reachable from the vector of nodes in GlobalNodes
+ // and merge the cloned global nodes with the corresponding ones, if any.
+ NodeMapTy OldNodeMap;
+ cloneReachableSubgraph(*GlobalsGraph, GlobalNodeSet, OldNodeMap,CompletedMap);
+
+ // Merging global nodes leaves behind unused nodes: get rid of them now.
+ OldNodeMap.clear(); // remove references before dead node cleanup
+ CompletedMap.clear(); // remove references before dead node cleanup
+ removeTriviallyDeadNodes();
+}
+
+/// cloneInto - Clone the specified DSGraph into the current graph. The
+/// translated ScalarMap for the old function is filled into the OldValMap
+/// member, and the translated ReturnNodes map is returned into ReturnNodes.
+///
+/// The CloneFlags member controls various aspects of the cloning process.
+///
+void DSGraph::cloneInto(const DSGraph &G, ScalarMapTy &OldValMap,
+ ReturnNodesTy &OldReturnNodes, NodeMapTy &OldNodeMap,
+ unsigned CloneFlags) {
assert(OldNodeMap.empty() && "Returned OldNodeMap should be empty!");
assert(&G != this && "Cannot clone graph into itself!");
Nodes.reserve(FN+G.Nodes.size());
// Remove alloca or mod/ref bits as specified...
- unsigned clearBits = (CloneFlags & StripAllocaBit ? DSNode::AllocaNode : 0)
- | (CloneFlags & StripModRefBits ? (DSNode::Modified | DSNode::Read) : 0);
- clearBits |= DSNode::DEAD; // Clear dead flag...
+ unsigned BitsToClear = ((CloneFlags & StripAllocaBit)? DSNode::AllocaNode : 0)
+ | ((CloneFlags & StripModRefBits)? (DSNode::Modified | DSNode::Read) : 0)
+ | ((CloneFlags & StripIncompleteBit)? DSNode::Incomplete : 0);
+ BitsToClear |= DSNode::DEAD; // Clear dead flag...
for (unsigned i = 0, e = G.Nodes.size(); i != e; ++i) {
DSNode *Old = G.Nodes[i];
DSNode *New = new DSNode(*Old, this);
- New->NodeType &= ~clearBits;
+ New->maskNodeTypes(~BitsToClear);
OldNodeMap[Old] = New;
}
Nodes[i]->remapLinks(OldNodeMap);
// Copy the scalar map... merging all of the global nodes...
- for (hash_map<Value*, DSNodeHandle>::const_iterator I = G.ScalarMap.begin(),
+ for (ScalarMapTy::const_iterator I = G.ScalarMap.begin(),
E = G.ScalarMap.end(); I != E; ++I) {
- DSNodeHandle &H = OldValMap[I->first];
DSNodeHandle &MappedNode = OldNodeMap[I->second.getNode()];
- H.setOffset(I->second.getOffset()+MappedNode.getOffset());
- H.setNode(MappedNode.getNode());
+ DSNodeHandle &H = OldValMap[I->first];
+ H.mergeWith(DSNodeHandle(MappedNode.getNode(),
+ I->second.getOffset()+MappedNode.getOffset()));
- if (isa<GlobalValue>(I->first)) { // Is this a global?
- hash_map<Value*, DSNodeHandle>::iterator GVI = ScalarMap.find(I->first);
- if (GVI != ScalarMap.end()) // Is the global value in this fn already?
- GVI->second.mergeWith(H);
- else
- ScalarMap[I->first] = H; // Add global pointer to this graph
+ // If this is a global, add the global to this fn or merge if already exists
+ if (GlobalValue* GV = dyn_cast<GlobalValue>(I->first)) {
+ ScalarMap[GV].mergeWith(H);
+ InlinedGlobals.insert(GV);
}
}
AuxFunctionCalls.push_back(DSCallSite(G.AuxFunctionCalls[i], OldNodeMap));
}
- // Return the returned node pointer...
- DSNodeHandle &MappedRet = OldNodeMap[G.RetNode.getNode()];
- return DSNodeHandle(MappedRet.getNode(),
- MappedRet.getOffset()+G.RetNode.getOffset());
+ // Map the return node pointers over...
+ for (ReturnNodesTy::const_iterator I = G.getReturnNodes().begin(),
+ E = G.getReturnNodes().end(); I != E; ++I) {
+ const DSNodeHandle &Ret = I->second;
+ DSNodeHandle &MappedRet = OldNodeMap[Ret.getNode()];
+ OldReturnNodes.insert(std::make_pair(I->first,
+ DSNodeHandle(MappedRet.getNode(),
+ MappedRet.getOffset()+Ret.getOffset())));
+ }
}
/// mergeInGraph - The method is used for merging graphs together. If the
/// merges the nodes specified in the call site with the formal arguments in the
/// graph.
///
-void DSGraph::mergeInGraph(DSCallSite &CS, const DSGraph &Graph,
- unsigned CloneFlags) {
- hash_map<Value*, DSNodeHandle> OldValMap;
+void DSGraph::mergeInGraph(const DSCallSite &CS, Function &F,
+ const DSGraph &Graph, unsigned CloneFlags) {
+ ScalarMapTy OldValMap, *ScalarMap;
DSNodeHandle RetVal;
- hash_map<Value*, DSNodeHandle> *ScalarMap = &OldValMap;
// If this is not a recursive call, clone the graph into this graph...
if (&Graph != this) {
// Clone the callee's graph into the current graph, keeping
// track of where scalars in the old graph _used_ to point,
// and of the new nodes matching nodes of the old graph.
- hash_map<const DSNode*, DSNodeHandle> OldNodeMap;
+ NodeMapTy OldNodeMap;
// The clone call may invalidate any of the vectors in the data
// structure graph. Strip locals and don't copy the list of callers
- RetVal = cloneInto(Graph, OldValMap, OldNodeMap, CloneFlags);
+ ReturnNodesTy OldRetNodes;
+ cloneInto(Graph, OldValMap, OldRetNodes, OldNodeMap, CloneFlags);
+
+ // We need to map the arguments for the function to the cloned nodes old
+ // argument values. Do this now.
+ RetVal = OldRetNodes[&F];
ScalarMap = &OldValMap;
} else {
- RetVal = getRetNode();
+ RetVal = getReturnNodeFor(F);
ScalarMap = &getScalarMap();
}
RetVal.mergeWith(CS.getRetVal());
// Resolve all of the function arguments...
- Function &F = Graph.getFunction();
Function::aiterator AI = F.abegin();
for (unsigned i = 0, e = CS.getNumPtrArgs(); i != e; ++i, ++AI) {
}
}
+/// getCallSiteForArguments - Get the arguments and return value bindings for
+/// the specified function in the current graph.
+///
+DSCallSite DSGraph::getCallSiteForArguments(Function &F) const {
+ std::vector<DSNodeHandle> Args;
+
+ for (Function::aiterator I = F.abegin(), E = F.aend(); I != E; ++I)
+ if (isPointerType(I->getType()))
+ Args.push_back(getScalarMap().find(I)->second);
+
+ return DSCallSite(*(CallInst*)0, getReturnNodeFor(F), &F, Args);
+}
+
+
// markIncompleteNodes - Mark the specified node as having contents that are not
// known with the current analysis we have performed. Because a node makes all
-// of the nodes it can reach imcomplete if the node itself is incomplete, we
+// of the nodes it can reach incomplete if the node itself is incomplete, we
// must recursively traverse the data structure graph, marking all reachable
// nodes as incomplete.
//
static void markIncompleteNode(DSNode *N) {
// Stop recursion if no node, or if node already marked...
- if (N == 0 || (N->NodeType & DSNode::Incomplete)) return;
+ if (N == 0 || N->isIncomplete()) return;
// Actually mark the node
- N->NodeType |= DSNode::Incomplete;
+ N->setIncompleteMarker();
// Recusively process children...
for (unsigned i = 0, e = N->getSize(); i < e; i += DS::PointerSize)
//
void DSGraph::markIncompleteNodes(unsigned Flags) {
// Mark any incoming arguments as incomplete...
- if ((Flags & DSGraph::MarkFormalArgs) && Func && Func->getName() != "main")
- for (Function::aiterator I = Func->abegin(), E = Func->aend(); I != E; ++I)
- if (isPointerType(I->getType()) && ScalarMap.find(I) != ScalarMap.end())
- markIncompleteNode(ScalarMap[I].getNode());
+ if (Flags & DSGraph::MarkFormalArgs)
+ for (ReturnNodesTy::iterator FI = ReturnNodes.begin(), E =ReturnNodes.end();
+ FI != E; ++FI) {
+ Function &F = *FI->first;
+ if (F.getName() != "main")
+ for (Function::aiterator I = F.abegin(), E = F.aend(); I != E; ++I)
+ if (isPointerType(I->getType()) &&
+ ScalarMap.find(I) != ScalarMap.end())
+ markIncompleteNode(ScalarMap[I].getNode());
+ }
// Mark stuff passed into functions calls as being incomplete...
if (!shouldPrintAuxCalls())
// Mark all global nodes as incomplete...
if ((Flags & DSGraph::IgnoreGlobals) == 0)
for (unsigned i = 0, e = Nodes.size(); i != e; ++i)
- if (Nodes[i]->NodeType & DSNode::GlobalNode)
+ if (Nodes[i]->isGlobalNode() && Nodes[i]->getNumLinks())
markIncompleteNode(Nodes[i]);
}
static inline void killIfUselessEdge(DSNodeHandle &Edge) {
if (DSNode *N = Edge.getNode()) // Is there an edge?
if (N->getNumReferrers() == 1) // Does it point to a lonely node?
- if ((N->NodeType & ~DSNode::Incomplete) == 0 && // No interesting info?
+ // No interesting info?
+ if ((N->getNodeFlags() & ~DSNode::Incomplete) == 0 &&
N->getType() == Type::VoidTy && !N->isNodeCompletelyFolded())
Edge.setNode(0); // Kill the edge!
}
return false;
}
-static void removeIdenticalCalls(std::vector<DSCallSite> &Calls,
- const std::string &where) {
+static void removeIdenticalCalls(std::vector<DSCallSite> &Calls) {
+
// Remove trivially identical function calls
unsigned NumFns = Calls.size();
std::sort(Calls.begin(), Calls.end()); // Sort by callee as primary key!
// If the Callee is a useless edge, this must be an unreachable call site,
// eliminate it.
if (CS.isIndirectCall() && CS.getCalleeNode()->getNumReferrers() == 1 &&
- CS.getCalleeNode()->NodeType == 0) { // No useful info?
+ CS.getCalleeNode()->getNodeFlags() == 0) { // No useful info?
std::cerr << "WARNING: Useless call site found??\n";
CS.swap(Calls.back());
Calls.pop_back();
LastCalleeContainsExternalFunction = LastCalleeFunc->isExternal();
}
+#if 1
if (LastCalleeContainsExternalFunction ||
// This should be more than enough context sensitivity!
// FIXME: Evaluate how many times this is tripped!
else if (CS.getNumPtrArgs() > OCS.getNumPtrArgs())
OCS = CS;
}
+#endif
} else {
if (CS.isDirectCall()) {
LastCalleeFunc = CS.getCalleeFunc();
NumCallNodesMerged += NumFns-Calls.size();
DEBUG(if (NumFns != Calls.size())
- std::cerr << "Merged " << (NumFns-Calls.size())
- << " call nodes in " << where << "\n";);
+ std::cerr << "Merged " << (NumFns-Calls.size()) << " call nodes.\n";);
}
// we don't have to perform any non-trivial analysis here.
//
void DSGraph::removeTriviallyDeadNodes() {
- removeIdenticalCalls(FunctionCalls, Func ? Func->getName() : "");
- removeIdenticalCalls(AuxFunctionCalls, Func ? Func->getName() : "");
+ removeIdenticalCalls(FunctionCalls);
+ removeIdenticalCalls(AuxFunctionCalls);
+
+ bool isGlobalsGraph = !GlobalsGraph;
for (unsigned i = 0; i != Nodes.size(); ++i) {
DSNode *Node = Nodes[i];
- if (!(Node->NodeType & ~(DSNode::Composition | DSNode::Array |
- DSNode::DEAD))) {
+
+ // Do not remove *any* global nodes in the globals graph.
+ // This is a special case because such nodes may not have I, M, R flags set.
+ if (Node->isGlobalNode() && isGlobalsGraph)
+ continue;
+
+ if (Node->isComplete() && !Node->isModified() && !Node->isRead()) {
// This is a useless node if it has no mod/ref info (checked above),
// outgoing edges (which it cannot, as it is not modified in this
// context), and it has no incoming edges. If it is a global node it may
// scalar map, so we check those now.
//
if (Node->getNumReferrers() == Node->getGlobals().size()) {
- std::vector<GlobalValue*> &Globals = Node->getGlobals();
+ const std::vector<GlobalValue*> &Globals = Node->getGlobals();
// Loop through and make sure all of the globals are referring directly
// to the node...
assert(N == Node && "ScalarMap doesn't match globals list!");
}
- // Make sure numreferrers still agrees, if so, the node is truely dead.
+ // Make sure NumReferrers still agrees, if so, the node is truly dead.
if (Node->getNumReferrers() == Globals.size()) {
for (unsigned j = 0, e = Globals.size(); j != e; ++j)
ScalarMap.erase(Globals[j]);
+ Node->makeNodeDead();
+ }
+ }
- Globals.clear();
- assert(Node->hasNoReferrers() && "Shouldn't have refs now!");
-
- Node->NodeType = DSNode::DEAD;
+#ifdef SANER_CODE_FOR_CHECKING_IF_ALL_REFERRERS_ARE_FROM_SCALARMAP
+ //
+ // *** It seems to me that we should be able to simply check if
+ // *** there are fewer or equal #referrers as #globals and make
+ // *** sure that all those referrers are in the scalar map?
+ //
+ if (Node->getNumReferrers() <= Node->getGlobals().size()) {
+ const std::vector<GlobalValue*> &Globals = Node->getGlobals();
+
+#ifndef NDEBUG
+ // Loop through and make sure all of the globals are referring directly
+ // to the node...
+ for (unsigned j = 0, e = Globals.size(); j != e; ++j) {
+ DSNode *N = ScalarMap.find(Globals[j])->second.getNode();
+ assert(N == Node && "ScalarMap doesn't match globals list!");
}
+#endif
+
+ // Make sure NumReferrers still agrees. The node is truly dead.
+ assert(Node->getNumReferrers() == Globals.size());
+ for (unsigned j = 0, e = Globals.size(); j != e; ++j)
+ ScalarMap.erase(Globals[j]);
+ Node->makeNodeDead();
}
+#endif
}
- if ((Node->NodeType & ~DSNode::DEAD) == 0 && Node->hasNoReferrers()) {
+ if (Node->getNodeFlags() == 0 && Node->hasNoReferrers()) {
// This node is dead!
delete Node; // Free memory...
Nodes[i--] = Nodes.back();
// marked as alive...
//
static bool CanReachAliveNodes(DSNode *N, hash_set<DSNode*> &Alive,
- hash_set<DSNode*> &Visited) {
+ hash_set<DSNode*> &Visited,
+ bool IgnoreGlobals) {
if (N == 0) return false;
assert(N->getForwardNode() == 0 && "Cannot mark a forwarded node!");
+ // If this is a global node, it will end up in the globals graph anyway, so we
+ // don't need to worry about it.
+ if (IgnoreGlobals && N->isGlobalNode()) return false;
+
// If we know that this node is alive, return so!
if (Alive.count(N)) return true;
Visited.insert(N); // No recursion, insert into Visited...
for (unsigned i = 0, e = N->getSize(); i < e; i += DS::PointerSize)
- if (CanReachAliveNodes(N->getLink(i).getNode(), Alive, Visited)) {
+ if (CanReachAliveNodes(N->getLink(i).getNode(), Alive, Visited,
+ IgnoreGlobals)) {
N->markReachableNodes(Alive);
return true;
}
// alive nodes.
//
static bool CallSiteUsesAliveArgs(DSCallSite &CS, hash_set<DSNode*> &Alive,
- hash_set<DSNode*> &Visited) {
- if (CanReachAliveNodes(CS.getRetVal().getNode(), Alive, Visited))
+ hash_set<DSNode*> &Visited,
+ bool IgnoreGlobals) {
+ if (CanReachAliveNodes(CS.getRetVal().getNode(), Alive, Visited,
+ IgnoreGlobals))
return true;
if (CS.isIndirectCall() &&
- CanReachAliveNodes(CS.getCalleeNode(), Alive, Visited))
+ CanReachAliveNodes(CS.getCalleeNode(), Alive, Visited, IgnoreGlobals))
return true;
for (unsigned i = 0, e = CS.getNumPtrArgs(); i != e; ++i)
- if (CanReachAliveNodes(CS.getPtrArg(i).getNode(), Alive, Visited))
+ if (CanReachAliveNodes(CS.getPtrArg(i).getNode(), Alive, Visited,
+ IgnoreGlobals))
return true;
return false;
}
// inlining graphs.
//
void DSGraph::removeDeadNodes(unsigned Flags) {
+ DEBUG(AssertGraphOK(); GlobalsGraph->AssertGraphOK());
+
// Reduce the amount of work we have to do... remove dummy nodes left over by
// merging...
removeTriviallyDeadNodes();
std::vector<std::pair<Value*, DSNode*> > GlobalNodes;
// Mark all nodes reachable by (non-global) scalar nodes as alive...
- for (hash_map<Value*, DSNodeHandle>::iterator I = ScalarMap.begin(),
- E = ScalarMap.end(); I != E; )
+ for (ScalarMapTy::iterator I = ScalarMap.begin(), E = ScalarMap.end(); I !=E;)
if (isa<GlobalValue>(I->first)) { // Keep track of global nodes
assert(I->second.getNode() && "Null global node?");
+ assert(I->second.getNode()->isGlobalNode() && "Should be a global node!");
GlobalNodes.push_back(std::make_pair(I->first, I->second.getNode()));
++I;
} else {
// these, prune the scalar pointing to it.
//
DSNode *N = I->second.getNode();
- if (N->NodeType == DSNode::UnknownNode && !isa<Argument>(I->first)) {
+ if (N->getNodeFlags() == DSNode::UnknownNode && !isa<Argument>(I->first)){
ScalarMap.erase(I++);
} else {
I->second.getNode()->markReachableNodes(Alive);
}
// The return value is alive as well...
- RetNode.getNode()->markReachableNodes(Alive);
+ for (ReturnNodesTy::iterator I = ReturnNodes.begin(), E = ReturnNodes.end();
+ I != E; ++I)
+ I->second.getNode()->markReachableNodes(Alive);
// Mark any nodes reachable by primary calls as alive...
for (unsigned i = 0, e = FunctionCalls.size(); i != e; ++i)
FunctionCalls[i].markReachableNodes(Alive);
+ // Copy and merge all information about globals to the GlobalsGraph
+ // if this is not a final pass (where unreachable globals are removed)
+ NodeMapTy GlobalNodeMap;
+ hash_set<const DSNode*> GlobalNodeSet;
+
+ for (std::vector<std::pair<Value*, DSNode*> >::const_iterator
+ I = GlobalNodes.begin(), E = GlobalNodes.end(); I != E; ++I)
+ GlobalNodeSet.insert(I->second); // put global nodes into a set
+
+ // Now find globals and aux call nodes that are already live or reach a live
+ // value (which makes them live in turn), and continue till no more are found.
+ //
bool Iterate;
hash_set<DSNode*> Visited;
std::vector<unsigned char> AuxFCallsAlive(AuxFunctionCalls.size());
do {
Visited.clear();
- // If any global nodes points to a non-global that is "alive", the global is
+ // If any global node points to a non-global that is "alive", the global is
// "alive" as well... Remove it from the GlobalNodes list so we only have
// unreachable globals in the list.
//
Iterate = false;
- for (unsigned i = 0; i != GlobalNodes.size(); ++i)
- if (CanReachAliveNodes(GlobalNodes[i].second, Alive, Visited)) {
- std::swap(GlobalNodes[i--], GlobalNodes.back()); // Move to end to erase
- GlobalNodes.pop_back(); // Erase efficiently
- Iterate = true;
- }
-
+ if (!(Flags & DSGraph::RemoveUnreachableGlobals))
+ for (unsigned i = 0; i != GlobalNodes.size(); ++i)
+ if (CanReachAliveNodes(GlobalNodes[i].second, Alive, Visited,
+ Flags & DSGraph::RemoveUnreachableGlobals)) {
+ std::swap(GlobalNodes[i--], GlobalNodes.back()); // Move to end to...
+ GlobalNodes.pop_back(); // erase efficiently
+ Iterate = true;
+ }
+
+ // Mark only unresolvable call nodes for moving to the GlobalsGraph since
+ // call nodes that get resolved will be difficult to remove from that graph.
+ // The final unresolved call nodes must be handled specially at the end of
+ // the BU pass (i.e., in main or other roots of the call graph).
for (unsigned i = 0, e = AuxFunctionCalls.size(); i != e; ++i)
if (!AuxFCallsAlive[i] &&
- CallSiteUsesAliveArgs(AuxFunctionCalls[i], Alive, Visited)) {
+ (AuxFunctionCalls[i].isIndirectCall()
+ || CallSiteUsesAliveArgs(AuxFunctionCalls[i], Alive, Visited,
+ Flags & DSGraph::RemoveUnreachableGlobals))) {
AuxFunctionCalls[i].markReachableNodes(Alive);
AuxFCallsAlive[i] = true;
Iterate = true;
}
} while (Iterate);
- // Remove all dead aux function calls...
+ // Move dead aux function calls to the end of the list
unsigned CurIdx = 0;
for (unsigned i = 0, e = AuxFunctionCalls.size(); i != e; ++i)
if (AuxFCallsAlive[i])
AuxFunctionCalls[CurIdx++].swap(AuxFunctionCalls[i]);
+
+ // Copy and merge all global nodes and dead aux call nodes into the
+ // GlobalsGraph, and all nodes reachable from those nodes
+ //
+ if (!(Flags & DSGraph::RemoveUnreachableGlobals)) {
+
+ // First, add the dead aux call nodes to the set of root nodes for cloning
+ // -- return value at this call site, if any
+ // -- actual arguments passed at this call site
+ // -- callee node at this call site, if this is an indirect call
+ for (unsigned i = CurIdx, e = AuxFunctionCalls.size(); i != e; ++i) {
+ if (const DSNode* RetNode = AuxFunctionCalls[i].getRetVal().getNode())
+ GlobalNodeSet.insert(RetNode);
+ for (unsigned j=0, N=AuxFunctionCalls[i].getNumPtrArgs(); j < N; ++j)
+ if (const DSNode* ArgTarget=AuxFunctionCalls[i].getPtrArg(j).getNode())
+ GlobalNodeSet.insert(ArgTarget);
+ if (AuxFunctionCalls[i].isIndirectCall())
+ GlobalNodeSet.insert(AuxFunctionCalls[i].getCalleeNode());
+ }
+
+ // There are no "pre-completed" nodes so use any empty map for those.
+ // Strip all alloca bits since the current function is only for the BU pass.
+ // Strip all incomplete bits since they are short-lived properties and they
+ // will be correctly computed when rematerializing nodes into the functions.
+ //
+ NodeMapTy CompletedMap;
+ GlobalsGraph->cloneReachableSubgraph(*this, GlobalNodeSet,
+ GlobalNodeMap, CompletedMap,
+ (DSGraph::StripAllocaBit |
+ DSGraph::StripIncompleteBit));
+ }
+
+ // Remove all dead aux function calls...
if (!(Flags & DSGraph::RemoveUnreachableGlobals)) {
assert(GlobalsGraph && "No globals graph available??");
- // Move the unreachable call nodes to the globals graph...
- GlobalsGraph->AuxFunctionCalls.insert(GlobalsGraph->AuxFunctionCalls.end(),
- AuxFunctionCalls.begin()+CurIdx,
- AuxFunctionCalls.end());
+
+ // Copy the unreachable call nodes to the globals graph, updating
+ // their target pointers using the GlobalNodeMap
+ for (unsigned i = CurIdx, e = AuxFunctionCalls.size(); i != e; ++i)
+ GlobalsGraph->AuxFunctionCalls.push_back(DSCallSite(AuxFunctionCalls[i],
+ GlobalNodeMap));
}
// Crop all the useless ones out...
AuxFunctionCalls.erase(AuxFunctionCalls.begin()+CurIdx,
AuxFunctionCalls.end());
- // At this point, any nodes which are visited, but not alive, are nodes which
- // should be moved to the globals graph. Loop over all nodes, eliminating
- // completely unreachable nodes, and moving visited nodes to the globals graph
+ // We are finally done with the GlobalNodeMap so we can clear it and
+ // then get rid of unused nodes in the GlobalsGraph produced by merging.
+ GlobalNodeMap.clear();
+ GlobalsGraph->removeTriviallyDeadNodes();
+
+ // At this point, any nodes which are visited, but not alive, are nodes
+ // which can be removed. Loop over all nodes, eliminating completely
+ // unreachable nodes.
//
std::vector<DSNode*> DeadNodes;
DeadNodes.reserve(Nodes.size());
DSNode *N = Nodes[i];
Nodes[i--] = Nodes.back(); // move node to end of vector
Nodes.pop_back(); // Erase node from alive list.
- if (!(Flags & DSGraph::RemoveUnreachableGlobals) && // Not in TD pass
- Visited.count(N)) { // Visited but not alive?
- GlobalsGraph->Nodes.push_back(N); // Move node to globals graph
- N->setParentGraph(GlobalsGraph);
- } else { // Otherwise, delete the node
- assert(((N->NodeType & DSNode::GlobalNode) == 0 ||
- (Flags & DSGraph::RemoveUnreachableGlobals))
- && "Killing a global?");
- //std::cerr << "[" << i+1 << "/" << DeadNodes.size()
- // << "] Node is dead: "; N->dump();
- DeadNodes.push_back(N);
- N->dropAllReferences();
- }
+ DeadNodes.push_back(N);
+ N->dropAllReferences();
} else {
assert(Nodes[i]->getForwardNode() == 0 && "Alive forwarded node?");
}
- // Now that the nodes have either been deleted or moved to the globals graph,
- // loop over the scalarmap, updating the entries for globals...
- //
- if (!(Flags & DSGraph::RemoveUnreachableGlobals)) { // Not in the TD pass?
- // In this array we start the remapping, which can cause merging. Because
- // of this, the DSNode pointers in GlobalNodes may be invalidated, so we
- // must always go through the ScalarMap (which contains DSNodeHandles [which
- // cannot be invalidated by merging]).
- //
- for (unsigned i = 0, e = GlobalNodes.size(); i != e; ++i) {
- Value *G = GlobalNodes[i].first;
- hash_map<Value*, DSNodeHandle>::iterator I = ScalarMap.find(G);
- assert(I != ScalarMap.end() && "Global not in scalar map anymore?");
- assert(I->second.getNode() && "Global not pointing to anything?");
- assert(!Alive.count(I->second.getNode()) && "Node is alive??");
- GlobalsGraph->ScalarMap[G].mergeWith(I->second);
- assert(GlobalsGraph->ScalarMap[G].getNode() &&
- "Global not pointing to anything?");
- ScalarMap.erase(I);
- }
-
- // Merging leaves behind silly nodes, we remove them to avoid polluting the
- // globals graph.
- if (!GlobalNodes.empty())
- GlobalsGraph->removeTriviallyDeadNodes();
- } else {
- // If we are in the top-down pass, remove all unreachable globals from the
- // ScalarMap...
- for (unsigned i = 0, e = GlobalNodes.size(); i != e; ++i)
+ // Remove all unreachable globals from the ScalarMap.
+ // If flag RemoveUnreachableGlobals is set, GlobalNodes has only dead nodes.
+ // In either case, the dead nodes will not be in the set Alive.
+ for (unsigned i = 0, e = GlobalNodes.size(); i != e; ++i) {
+ assert(((Flags & DSGraph::RemoveUnreachableGlobals) ||
+ !Alive.count(GlobalNodes[i].second)) && "huh? non-dead global");
+ if (!Alive.count(GlobalNodes[i].second))
ScalarMap.erase(GlobalNodes[i].first);
}
- // Loop over all of the dead nodes now, deleting them since their referrer
- // count is zero.
+ // Delete all dead nodes now since their referrer counts are zero.
for (unsigned i = 0, e = DeadNodes.size(); i != e; ++i)
delete DeadNodes[i];
void DSGraph::AssertGraphOK() const {
for (unsigned i = 0, e = Nodes.size(); i != e; ++i)
Nodes[i]->assertOK();
- return; // FIXME: remove
- for (hash_map<Value*, DSNodeHandle>::const_iterator I = ScalarMap.begin(),
+
+ for (ScalarMapTy::const_iterator I = ScalarMap.begin(),
E = ScalarMap.end(); I != E; ++I) {
assert(I->second.getNode() && "Null node in scalarmap!");
AssertNodeInGraph(I->second.getNode());
if (GlobalValue *GV = dyn_cast<GlobalValue>(I->first)) {
- assert((I->second.getNode()->NodeType & DSNode::GlobalNode) &&
+ assert(I->second.getNode()->isGlobalNode() &&
"Global points to node, but node isn't global?");
AssertNodeContainsGlobal(I->second.getNode(), GV);
}
AssertCallNodesInGraph();
AssertAuxCallNodesInGraph();
}
+
+/// mergeInGlobalsGraph - This method is useful for clients to incorporate the
+/// globals graph into the DS, BU or TD graph for a function. This code retains
+/// all globals, i.e., does not delete unreachable globals after they are
+/// inlined.
+///
+void DSGraph::mergeInGlobalsGraph() {
+ NodeMapTy GlobalNodeMap;
+ ScalarMapTy OldValMap;
+ ReturnNodesTy OldRetNodes;
+ cloneInto(*GlobalsGraph, OldValMap, OldRetNodes, GlobalNodeMap,
+ DSGraph::KeepAllocaBit | DSGraph::DontCloneCallNodes |
+ DSGraph::DontCloneAuxCallNodes);
+
+ // Now merge existing global nodes in the GlobalsGraph with their copies
+ for (ScalarMapTy::iterator I = ScalarMap.begin(), E = ScalarMap.end();
+ I != E; ++I)
+ if (isa<GlobalValue>(I->first)) { // Found a global node
+ DSNodeHandle &GH = I->second;
+ DSNodeHandle &GGNodeH = GlobalsGraph->getScalarMap()[I->first];
+ GH.mergeWith(GlobalNodeMap[GGNodeH.getNode()]);
+ }
+
+ // Merging leaves behind unused nodes: get rid of them now.
+ GlobalNodeMap.clear();
+ OldValMap.clear();
+ OldRetNodes.clear();
+ removeTriviallyDeadNodes();
+}
projects / oota-llvm.git / blobdiff