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package vaporize.library;
import cs132.vapor.ast.*;
import misc.*;
import java.util.ArrayList;
public class ControlFlowGraph {
private ArrayList<CFGNode> nodes;
private CFGNode start;
protected ControlFlowGraph() {
this.nodes = new ArrayList<>();
this.start = null;
}
protected CFGNode getNode(Object a) {
CFGNode ret = null;
for (CFGNode n : this.nodes) {
if (n.equals(a)) {
ret = n;
break;
}
}
if (ret == null) {
String str = (a instanceof Node) ? ((Node) a).sourcePos.toString() :
a.toString();
MinimalLogger.severe(String.format("Could not find a node matching %s",
str));
}
return ret;
}
protected CFGNode getNextNode(CFGNode a) {
CFGNode ret = null;
// we return null if the passed node is the last in the list
for (int i = 0; i < this.nodes.size()-1; ++i) {
if (this.nodes.get(i).equals(a)) {
ret = this.nodes.get(i+1);
break;
}
}
if (ret == null)
MinimalLogger.severe(String.format("Could not find the next node for %s",
a.toString()));
return ret;
}
protected void addNode(CFGNode node) {
this.nodes.add(node);
}
protected String addEdge(CFGNode source, CFGNode dest) {
/**
* Iff the CFGNodes are different, construct an edge between them.
* All variables reaching the parent also reach the children.
*
* Returns a string capable of being manipulated by graphviz.
*/
String ret = "";
if (!source.equals(dest)) {
ret = String.format("%d -> %d",
source.getInstruction().sourcePos.line,
dest.getInstruction().sourcePos.line);
MinimalLogger.info(String.format("Edge %s",
ret));
source.addDest(dest);
dest.addSource(source);
ret += ";";
} else {
MinimalLogger.info(String.format("Skipping duplicate edge for %d",
source.getInstruction().sourcePos.line));
}
MinimalLogger.info(String.format("Spilling variables: %s",
source.getReaching().toString()));
dest.getReaching().addAll(source.getReaching());
return ret;
}
protected void setStart(CFGNode start) {
this.start = start;
}
protected ArrayList<CFGNode> getNodes() {
return this.nodes;
}
}
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