1 //===- DSGraph.h - Represent a collection of data structures ----*- C++ -*-===//
3 // This header defines the data structure graph.
5 //===----------------------------------------------------------------------===//
7 #ifndef LLVM_ANALYSIS_DSGRAPH_H
8 #define LLVM_ANALYSIS_DSGRAPH_H
10 #include "llvm/Analysis/DSNode.h"
12 //===----------------------------------------------------------------------===//
13 /// DSGraph - The graph that represents a function.
16 Function *Func; // Func - The LLVM function this graph corresponds to
17 DSGraph *GlobalsGraph; // Pointer to the common graph of global objects
18 bool PrintAuxCalls; // Should this graph print the Aux calls vector?
20 DSNodeHandle RetNode; // The node that gets returned...
21 std::vector<DSNode*> Nodes;
22 hash_map<Value*, DSNodeHandle> ScalarMap;
24 // FunctionCalls - This vector maintains a single entry for each call
25 // instruction in the current graph. The first entry in the vector is the
26 // scalar that holds the return value for the call, the second is the function
27 // scalar being invoked, and the rest are pointer arguments to the function.
28 // This vector is built by the Local graph and is never modified after that.
30 std::vector<DSCallSite> FunctionCalls;
32 // AuxFunctionCalls - This vector contains call sites that have been processed
33 // by some mechanism. In pratice, the BU Analysis uses this vector to hold
34 // the _unresolved_ call sites, because it cannot modify FunctionCalls.
36 std::vector<DSCallSite> AuxFunctionCalls;
38 void operator=(const DSGraph &); // DO NOT IMPLEMENT
40 DSGraph() : Func(0), GlobalsGraph(0) {} // Create a new, empty, DSGraph.
41 DSGraph(Function &F, DSGraph *GlobalsGraph); // Compute the local DSGraph
43 // Copy ctor - If you want to capture the node mapping between the source and
44 // destination graph, you may optionally do this by specifying a map to record
47 // Note that a copied graph does not retain the GlobalsGraph pointer of the
48 // source. You need to set a new GlobalsGraph with the setGlobalsGraph
51 DSGraph(const DSGraph &DSG);
52 DSGraph(const DSGraph &DSG, hash_map<const DSNode*, DSNodeHandle> &NodeMap);
55 bool hasFunction() const { return Func != 0; }
56 Function &getFunction() const {
57 assert(hasFunction() && "Cannot call getFunction on graph without a fn!");
61 DSGraph *getGlobalsGraph() const { return GlobalsGraph; }
62 void setGlobalsGraph(DSGraph *G) { GlobalsGraph = G; }
64 // setPrintAuxCalls - If you call this method, the auxillary call vector will
65 // be printed instead of the standard call vector to the dot file.
67 void setPrintAuxCalls() { PrintAuxCalls = true; }
68 bool shouldPrintAuxCalls() const { return PrintAuxCalls; }
70 /// getNodes - Get a vector of all the nodes in the graph
72 const std::vector<DSNode*> &getNodes() const { return Nodes; }
73 std::vector<DSNode*> &getNodes() { return Nodes; }
75 /// addNode - Add a new node to the graph.
77 void addNode(DSNode *N) { Nodes.push_back(N); }
79 /// getScalarMap - Get a map that describes what the nodes the scalars in this
80 /// function point to...
82 hash_map<Value*, DSNodeHandle> &getScalarMap() { return ScalarMap; }
83 const hash_map<Value*, DSNodeHandle> &getScalarMap() const {return ScalarMap;}
85 /// getFunctionCalls - Return the list of call sites in the original local
88 const std::vector<DSCallSite> &getFunctionCalls() const {
92 /// getAuxFunctionCalls - Get the call sites as modified by whatever passes
95 std::vector<DSCallSite> &getAuxFunctionCalls() {
96 return AuxFunctionCalls;
98 const std::vector<DSCallSite> &getAuxFunctionCalls() const {
99 return AuxFunctionCalls;
102 /// getNodeForValue - Given a value that is used or defined in the body of the
103 /// current function, return the DSNode that it points to.
105 DSNodeHandle &getNodeForValue(Value *V) { return ScalarMap[V]; }
107 const DSNodeHandle &getNodeForValue(Value *V) const {
108 hash_map<Value*, DSNodeHandle>::const_iterator I = ScalarMap.find(V);
109 assert(I != ScalarMap.end() &&
110 "Use non-const lookup function if node may not be in the map");
114 const DSNodeHandle &getRetNode() const { return RetNode; }
115 DSNodeHandle &getRetNode() { return RetNode; }
117 unsigned getGraphSize() const {
121 void print(std::ostream &O) const;
123 void writeGraphToFile(std::ostream &O, const std::string &GraphName) const;
125 /// maskNodeTypes - Apply a mask to all of the node types in the graph. This
126 /// is useful for clearing out markers like Incomplete.
128 void maskNodeTypes(unsigned char Mask) {
129 for (unsigned i = 0, e = Nodes.size(); i != e; ++i)
130 Nodes[i]->NodeType &= Mask;
132 void maskIncompleteMarkers() { maskNodeTypes(~DSNode::Incomplete); }
134 // markIncompleteNodes - Traverse the graph, identifying nodes that may be
135 // modified by other functions that have not been resolved yet. This marks
136 // nodes that are reachable through three sources of "unknownness":
137 // Global Variables, Function Calls, and Incoming Arguments
139 // For any node that may have unknown components (because something outside
140 // the scope of current analysis may have modified it), the 'Incomplete' flag
141 // is added to the NodeType.
143 enum MarkIncompleteFlags {
144 MarkFormalArgs = 1, IgnoreFormalArgs = 0,
146 void markIncompleteNodes(unsigned Flags);
148 // removeDeadNodes - Use a reachability analysis to eliminate subgraphs that
149 // are unreachable. This often occurs because the data structure doesn't
150 // "escape" into it's caller, and thus should be eliminated from the caller's
151 // graph entirely. This is only appropriate to use when inlining graphs.
153 enum RemoveDeadNodesFlags {
154 RemoveUnreachableGlobals = 1, KeepUnreachableGlobals = 0,
156 void removeDeadNodes(unsigned Flags);
158 // CloneFlags enum - Bits that may be passed into the cloneInto method to
159 // specify how to clone the function graph.
161 StripAllocaBit = 1 << 0, KeepAllocaBit = 0 << 0,
162 DontCloneCallNodes = 1 << 1, CloneCallNodes = 0 << 0,
163 DontCloneAuxCallNodes = 1 << 2, CloneAuxCallNodes = 0 << 0,
164 StripModRefBits = 1 << 3, KeepModRefBits = 0 << 0,
167 // cloneInto - Clone the specified DSGraph into the current graph, returning
168 // the Return node of the graph. The translated ScalarMap for the old
169 // function is filled into the OldValMap member. If StripAllocas is set to
170 // 'StripAllocaBit', Alloca markers are removed from the graph as the graph is
173 DSNodeHandle cloneInto(const DSGraph &G,
174 hash_map<Value*, DSNodeHandle> &OldValMap,
175 hash_map<const DSNode*, DSNodeHandle> &OldNodeMap,
176 unsigned CloneFlags = 0);
178 /// mergeInGraph - The method is used for merging graphs together. If the
179 /// argument graph is not *this, it makes a clone of the specified graph, then
180 /// merges the nodes specified in the call site with the formal arguments in
181 /// the graph. If the StripAlloca's argument is 'StripAllocaBit' then Alloca
182 /// markers are removed from nodes.
184 void mergeInGraph(DSCallSite &CS, const DSGraph &Graph, unsigned CloneFlags);
186 // Methods for checking to make sure graphs are well formed...
187 void AssertNodeInGraph(const DSNode *N) const {
188 assert((!N || find(Nodes.begin(), Nodes.end(), N) != Nodes.end()) &&
189 "AssertNodeInGraph: Node is not in graph!");
191 void AssertNodeContainsGlobal(const DSNode *N, GlobalValue *GV) const {
192 assert(std::find(N->getGlobals().begin(), N->getGlobals().end(), GV) !=
193 N->getGlobals().end() && "Global value not in node!");
196 void AssertCallSiteInGraph(const DSCallSite &CS) const {
197 if (CS.isIndirectCall())
198 AssertNodeInGraph(CS.getCalleeNode());
199 AssertNodeInGraph(CS.getRetVal().getNode());
200 for (unsigned j = 0, e = CS.getNumPtrArgs(); j != e; ++j)
201 AssertNodeInGraph(CS.getPtrArg(j).getNode());
204 void AssertCallNodesInGraph() const {
205 for (unsigned i = 0, e = FunctionCalls.size(); i != e; ++i)
206 AssertCallSiteInGraph(FunctionCalls[i]);
208 void AssertAuxCallNodesInGraph() const {
209 for (unsigned i = 0, e = AuxFunctionCalls.size(); i != e; ++i)
210 AssertCallSiteInGraph(AuxFunctionCalls[i]);
213 void AssertGraphOK() const;
216 // removeTriviallyDeadNodes - After the graph has been constructed, this
217 // method removes all unreachable nodes that are created because they got
218 // merged with other nodes in the graph. This is used as the first step of
221 void removeTriviallyDeadNodes();