//===- DSGraph.h - Represent a collection of data structures ----*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
//
-// This header defines the data structure graph.
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This header defines the data structure graph (DSGraph) and the
+// ReachabilityCloner class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/DSNode.h"
+namespace llvm {
+
+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.
//
std::vector<DSCallSite> AuxFunctionCalls;
+ // InlinedGlobals - This set records which globals have been inlined from
+ // other graphs (callers or callees, depending on the pass) into this one.
+ //
+ GlobalSetTy InlinedGlobals;
+
+ /// TD - This is the target data object for the machine this graph is
+ /// constructed for.
+ const TargetData &TD;
+
void operator=(const DSGraph &); // DO NOT IMPLEMENT
+
public:
// Create a new, empty, DSGraph.
- DSGraph() : GlobalsGraph(0), PrintAuxCalls(false) {}
- DSGraph(Function &F, DSGraph *GlobalsGraph); // Compute the local DSGraph
+ DSGraph(const TargetData &td)
+ : GlobalsGraph(0), PrintAuxCalls(false), TD(td) {}
+
+ // Compute the local DSGraph
+ DSGraph(const TargetData &td, Function &F, DSGraph *GlobalsGraph);
// Copy ctor - If you want to capture the node mapping between the source and
// destination graph, you may optionally do this by specifying a map to record
DSGraph *getGlobalsGraph() const { return GlobalsGraph; }
void setGlobalsGraph(DSGraph *G) { GlobalsGraph = G; }
- // setPrintAuxCalls - If you call this method, the auxillary call vector will
- // be printed instead of the standard call vector to the dot file.
- //
+ /// getTargetData - Return the TargetData object for the current target.
+ ///
+ const TargetData &getTargetData() const { return TD; }
+
+ /// setPrintAuxCalls - If you call this method, the auxillary call vector will
+ /// be printed instead of the standard call vector to the dot file.
+ ///
void setPrintAuxCalls() { PrintAuxCalls = true; }
bool shouldPrintAuxCalls() const { return PrintAuxCalls; }
/// 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)
/// function point to...
///
ScalarMapTy &getScalarMap() { return ScalarMap; }
- const ScalarMapTy &getScalarMap() const {return ScalarMap;}
+ const ScalarMapTy &getScalarMap() const { return ScalarMap; }
/// getFunctionCalls - Return the list of call sites in the original local
/// graph...
return AuxFunctionCalls;
}
+ /// getInlinedGlobals - Get the set of globals that are have been inlined
+ /// (from callees in BU or from callers in TD) into the current graph.
+ ///
+ GlobalSetTy& getInlinedGlobals() {
+ return InlinedGlobals;
+ }
+
/// getNodeForValue - Given a value that is used or defined in the body of the
/// current function, return the DSNode that it points to.
///
/// CloneFlags enum - Bits that may be passed into the cloneInto method to
/// specify how to clone the function graph.
enum CloneFlags {
- StripAllocaBit = 1 << 0, KeepAllocaBit = 0 << 0,
- DontCloneCallNodes = 1 << 1, CloneCallNodes = 0 << 0,
- DontCloneAuxCallNodes = 1 << 2, CloneAuxCallNodes = 0 << 0,
- StripModRefBits = 1 << 3, KeepModRefBits = 0 << 0,
+ StripAllocaBit = 1 << 0, KeepAllocaBit = 0,
+ DontCloneCallNodes = 1 << 1, CloneCallNodes = 0,
+ DontCloneAuxCallNodes = 1 << 2, CloneAuxCallNodes = 0,
+ StripModRefBits = 1 << 3, KeepModRefBits = 0,
+ StripIncompleteBit = 1 << 4, KeepIncompleteBit = 0,
+ UpdateInlinedGlobals = 1 << 5, DontUpdateInlinedGlobals = 0,
};
+ void updateFromGlobalGraph();
+
+ /// 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.
+ ///
+ static void computeNodeMapping(const DSNodeHandle &NH1,
+ const DSNodeHandle &NH2, NodeMapTy &NodeMap,
+ bool StrictChecking = true);
+
+
/// 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.
+ /// OldNodeMap contains a mapping from the original nodes to the newly cloned
+ /// nodes.
///
/// The CloneFlags member controls various aspects of the cloning process.
///
// 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;
-public:
- // 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
- // removeDeadNodes.
- //
+ /// 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
+ /// removeDeadNodes.
+ ///
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
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