//
//===----------------------------------------------------------------------===//
//
-// This header defines the data structure graph.
+// This header defines the data structure graph (DSGraph) and the
+// ReachabilityCloner class.
//
//===----------------------------------------------------------------------===//
class GlobalValue;
+//===----------------------------------------------------------------------===//
+/// DSScalarMap - An instance of this class is used to keep track of all of
+/// which DSNode each scalar in a function points to. This is specialized to
+/// keep track of globals with nodes in the function, and to keep track of the
+/// unique DSNodeHandle being used by the scalar map.
+///
+/// This class is crucial to the efficiency of DSA with some large SCC's. In
+/// these cases, the cost of iterating over the scalar map dominates the cost
+/// of DSA. In all of these cases, the DSA phase is really trying to identify
+/// globals or unique node handles active in the function.
+///
+class DSScalarMap {
+ typedef hash_map<Value*, DSNodeHandle> ValueMapTy;
+ ValueMapTy ValueMap;
+
+ typedef hash_set<GlobalValue*> GlobalSetTy;
+ GlobalSetTy GlobalSet;
+public:
+
+ // Compatibility methods: provide an interface compatible with a map of
+ // Value* to DSNodeHandle's.
+ typedef ValueMapTy::const_iterator const_iterator;
+ typedef ValueMapTy::iterator iterator;
+ iterator begin() { return ValueMap.begin(); }
+ iterator end() { return ValueMap.end(); }
+ const_iterator begin() const { return ValueMap.begin(); }
+ const_iterator end() const { return ValueMap.end(); }
+ iterator find(Value *V) { return ValueMap.find(V); }
+ const_iterator find(Value *V) const { return ValueMap.find(V); }
+ unsigned count(Value *V) const { return ValueMap.count(V); }
+
+ void erase(Value *V) { erase(find(V)); }
+
+ DSNodeHandle &operator[](Value *V) {
+ std::pair<iterator,bool> IP =
+ ValueMap.insert(std::make_pair(V, DSNodeHandle()));
+ if (IP.second) { // Inserted the new entry into the map.
+ if (GlobalValue *GV = dyn_cast<GlobalValue>(V))
+ GlobalSet.insert(GV);
+ }
+ return IP.first->second;
+ }
+
+ void erase(iterator I) {
+ assert(I != ValueMap.end() && "Cannot erase end!");
+ if (GlobalValue *GV = dyn_cast<GlobalValue>(I->first))
+ GlobalSet.erase(GV);
+ ValueMap.erase(I);
+ }
+
+ void clear() {
+ ValueMap.clear();
+ GlobalSet.clear();
+ }
+
+ // Access to the global set: the set of all globals currently in the
+ // scalar map.
+ typedef GlobalSetTy::const_iterator global_iterator;
+ global_iterator global_begin() const { return GlobalSet.begin(); }
+ global_iterator global_end() const { return GlobalSet.end(); }
+};
+
+
//===----------------------------------------------------------------------===//
/// DSGraph - The graph that represents a function.
///
struct DSGraph {
// Public data-type declarations...
- typedef hash_map<Value*, DSNodeHandle> ScalarMapTy;
+ typedef DSScalarMap ScalarMapTy;
typedef hash_map<Function*, DSNodeHandle> ReturnNodesTy;
typedef hash_set<GlobalValue*> GlobalSetTy;
+ typedef std::vector<DSNode*> NodeListTy;
/// NodeMapTy - This data type is used when cloning one graph into another to
/// keep track of the correspondence between the nodes in the old and new
DSGraph *GlobalsGraph; // Pointer to the common graph of global objects
bool PrintAuxCalls; // Should this graph print the Aux calls vector?
- std::vector<DSNode*> Nodes;
+ NodeListTy Nodes;
ScalarMapTy ScalarMap;
// ReturnNodes - A return value for every function merged into this graph.
/// getNodes - Get a vector of all the nodes in the graph
///
- const std::vector<DSNode*> &getNodes() const { return Nodes; }
- std::vector<DSNode*> &getNodes() { return Nodes; }
+ typedef NodeListTy::const_iterator node_iterator;
+ node_iterator node_begin() const { return Nodes.begin(); }
+ node_iterator node_end() const { return Nodes.end(); }
/// getFunctionNames - Return a space separated list of the name of the
/// functions in this graph (if any)
/// is useful for clearing out markers like Incomplete.
///
void maskNodeTypes(unsigned Mask) {
- for (unsigned i = 0, e = Nodes.size(); i != e; ++i)
- Nodes[i]->maskNodeTypes(Mask);
+ for (node_iterator I = node_begin(), E = node_end(); I != E; ++I)
+ (*I)->maskNodeTypes(Mask);
}
void maskIncompleteMarkers() { maskNodeTypes(~DSNode::Incomplete); }
UpdateInlinedGlobals = 1 << 5, DontUpdateInlinedGlobals = 0,
};
-private:
- void cloneReachableNodes(const DSNode* Node, unsigned BitsToClear,
- NodeMapTy& OldNodeMap, GlobalSetTy &Globals);
-
-public:
void updateFromGlobalGraph();
- void cloneReachableSubgraph(const DSGraph &G,
- hash_set<const DSNode*> &RootNodes,
- NodeMapTy &OldNodeMap,
- unsigned CloneFlags = 0);
-
-
/// computeNodeMapping - Given roots in two different DSGraphs, traverse the
/// nodes reachable from the two graphs, computing the mapping of nodes from
/// the first to the second graph.
ReturnNodesTy &OldReturnNodes, NodeMapTy &OldNodeMap,
unsigned CloneFlags = 0);
- /// clonePartiallyInto - Clone the reachable subset of the specified DSGraph
- /// into the current graph, for the specified function.
- ///
- /// This differs from cloneInto in that it only clones nodes reachable from
- /// globals, call nodes, the scalars specified in ValBindings, and the return
- /// value of the specified function. This method merges the the cloned
- /// version of the scalars and return value with the specified DSNodeHandles.
- ///
- /// On return, OldNodeMap contains a mapping from the original nodes to the
- /// newly cloned nodes, for the subset of nodes that were actually cloned.
- ///
- /// The CloneFlags member controls various aspects of the cloning process.
- ///
- void clonePartiallyInto(const DSGraph &G, Function &F,
- const DSNodeHandle &RetVal,
- const ScalarMapTy &ValBindings, NodeMapTy &OldNodeMap,
- unsigned CloneFlags = 0);
-
/// mergeInGraph - The method is used for merging graphs together. If the
/// argument graph is not *this, it makes a clone of the specified graph, then
/// merges the nodes specified in the call site with the formal arguments in
// Methods for checking to make sure graphs are well formed...
void AssertNodeInGraph(const DSNode *N) const {
- assert((!N || find(Nodes.begin(), Nodes.end(), N) != Nodes.end()) &&
+ assert((!N || N->getParentGraph() == this) &&
"AssertNodeInGraph: Node is not in graph!");
}
void AssertNodeContainsGlobal(const DSNode *N, GlobalValue *GV) const {
void AssertGraphOK() const;
- /// 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 mergeInGlobalsGraph();
-
/// removeTriviallyDeadNodes - After the graph has been constructed, this
/// method removes all unreachable nodes that are created because they got
/// merged with other nodes in the graph. This is used as the first step of
void removeTriviallyDeadNodes();
};
+
+ /// ReachabilityCloner - This class is used to incrementally clone and merge
+ /// nodes from a non-changing source graph into a potentially mutating
+ /// destination graph. Nodes are only cloned over on demand, either in
+ /// responds to a merge() or getClonedNH() call. When a node is cloned over,
+ /// all of the nodes reachable from it are automatically brought over as well.
+ class ReachabilityCloner {
+ DSGraph &Dest;
+ const DSGraph &Src;
+
+ /// BitsToKeep - These bits are retained from the source node when the
+ /// source nodes are merged into the destination graph.
+ unsigned BitsToKeep;
+ unsigned CloneFlags;
+
+ // NodeMap - A mapping from nodes in the source graph to the nodes that
+ // represent them in the destination graph.
+ DSGraph::NodeMapTy NodeMap;
+ public:
+ ReachabilityCloner(DSGraph &dest, const DSGraph &src, unsigned cloneFlags)
+ : Dest(dest), Src(src), CloneFlags(cloneFlags) {
+ assert(&Dest != &Src && "Cannot clone from graph to same graph!");
+ BitsToKeep = ~DSNode::DEAD;
+ if (CloneFlags & DSGraph::StripAllocaBit)
+ BitsToKeep &= ~DSNode::AllocaNode;
+ if (CloneFlags & DSGraph::StripModRefBits)
+ BitsToKeep &= ~(DSNode::Modified | DSNode::Read);
+ if (CloneFlags & DSGraph::StripIncompleteBit)
+ BitsToKeep &= ~DSNode::Incomplete;
+ }
+
+ DSNodeHandle getClonedNH(const DSNodeHandle &SrcNH);
+
+ void merge(const DSNodeHandle &NH, const DSNodeHandle &SrcNH);
+
+ /// mergeCallSite - Merge the nodes reachable from the specified src call
+ /// site into the nodes reachable from DestCS.
+ void mergeCallSite(const DSCallSite &DestCS, const DSCallSite &SrcCS);
+
+ bool clonedNode() const { return !NodeMap.empty(); }
+
+ void destroy() { NodeMap.clear(); }
+ };
} // End llvm namespace
#endif
projects / oota-llvm.git / blobdiff