StatementAndBraceFinder.java
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net.sourceforge.pmd.dfa |
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PMD |
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/*
* Created on 11.07.2004
*/
package net.sourceforge.pmd.dfa;
import net.sourceforge.pmd.ast.*;
/**
* @author raik
* <p/>
* Sublayer of DataFlowFacade. Finds all data flow nodes and stores the
* type information (@see StackObject). At last it uses this information to
* link the nodes.
*/
public class StatementAndBraceFinder extends JavaParserVisitorAdapter {
private Structure dataFlow;
public void buildDataFlowFor(SimpleJavaNode node) {
if (!(node instanceof ASTMethodDeclaration) && !(node instanceof ASTConstructorDeclaration)) {
throw new RuntimeException("Can't build a data flow for anything other than a method or a constructor");
}
this.dataFlow = new Structure();
this.dataFlow.createStartNode(node.getBeginLine());
this.dataFlow.createNewNode(node);
node.jjtAccept(this, dataFlow);
this.dataFlow.createEndNode(node.getEndLine());
Linker linker = new Linker(dataFlow.getBraceStack(), dataFlow.getContinueBreakReturnStack());
try {
linker.computePaths();
} catch (LinkerException e) {
e.printStackTrace();
} catch (SequenceException e) {
e.printStackTrace();
}
}
public Object visit(ASTStatementExpression node, Object data) {
if (!(data instanceof Structure)) {
return data;
}
Structure dataFlow = (Structure) data;
dataFlow.createNewNode(node);
return super.visit(node, data);
}
public Object visit(ASTVariableDeclarator node, Object data) {
if (!(data instanceof Structure)) {
return data;
}
Structure dataFlow = (Structure) data;
dataFlow.createNewNode(node);
return super.visit(node, data);
}
public Object visit(ASTExpression node, Object data) {
if (!(data instanceof Structure)) {
return data;
}
Structure dataFlow = (Structure) data;
// TODO what about throw stmts?
if (node.jjtGetParent() instanceof ASTIfStatement) {
dataFlow.createNewNode(node); // START IF
dataFlow.pushOnStack(NodeType.IF_EXPR, dataFlow.getLast());
} else if (node.jjtGetParent() instanceof ASTWhileStatement) {
dataFlow.createNewNode(node); // START WHILE
dataFlow.pushOnStack(NodeType.WHILE_EXPR, dataFlow.getLast());
} else if (node.jjtGetParent() instanceof ASTSwitchStatement) {
dataFlow.createNewNode(node); // START SWITCH
dataFlow.pushOnStack(NodeType.SWITCH_START, dataFlow.getLast());
} else if (node.jjtGetParent() instanceof ASTForStatement) {
dataFlow.createNewNode(node); // FOR EXPR
dataFlow.pushOnStack(NodeType.FOR_EXPR, dataFlow.getLast());
} else if (node.jjtGetParent() instanceof ASTDoStatement) {
dataFlow.createNewNode(node); // DO EXPR
dataFlow.pushOnStack(NodeType.DO_EXPR, dataFlow.getLast());
}
return super.visit(node, data);
}
public Object visit(ASTForInit node, Object data) {
if (!(data instanceof Structure)) {
return data;
}
Structure dataFlow = (Structure) data;
super.visit(node, data);
dataFlow.pushOnStack(NodeType.FOR_INIT, dataFlow.getLast());
this.addForExpressionNode(node, dataFlow);
return data;
}
public Object visit(ASTLabeledStatement node, Object data) {
dataFlow.createNewNode(node);
dataFlow.pushOnStack(NodeType.LABEL_STATEMENT, dataFlow.getLast());
return super.visit(node, data);
}
public Object visit(ASTForUpdate node, Object data) {
if (!(data instanceof Structure)) {
return data;
}
Structure dataFlow = (Structure) data;
this.addForExpressionNode(node, dataFlow);
super.visit(node, data);
dataFlow.pushOnStack(NodeType.FOR_UPDATE, dataFlow.getLast());
return data;
}
// ----------------------------------------------------------------------------
// BRANCH OUT
public Object visit(ASTStatement node, Object data) {
if (!(data instanceof Structure)) {
return data;
}
Structure dataFlow = (Structure) data;
if (node.jjtGetParent() instanceof ASTForStatement) {
this.addForExpressionNode(node, dataFlow);
dataFlow.pushOnStack(NodeType.FOR_BEFORE_FIRST_STATEMENT, dataFlow.getLast());
} else if (node.jjtGetParent() instanceof ASTDoStatement) {
dataFlow.pushOnStack(NodeType.DO_BEFORE_FIRST_STATEMENT, dataFlow.getLast());
dataFlow.createNewNode((SimpleNode) node.jjtGetParent());
}
super.visit(node, data);
if (node.jjtGetParent() instanceof ASTIfStatement) {
ASTIfStatement st = (ASTIfStatement) node.jjtGetParent();
if (!st.hasElse()) {
dataFlow.pushOnStack(NodeType.IF_LAST_STATEMENT_WITHOUT_ELSE, dataFlow.getLast());
} else if (st.hasElse() && !st.jjtGetChild(1).equals(node)) {
dataFlow.pushOnStack(NodeType.ELSE_LAST_STATEMENT, dataFlow.getLast());
} else {
dataFlow.pushOnStack(NodeType.IF_LAST_STATEMENT, dataFlow.getLast());
}
} else if (node.jjtGetParent() instanceof ASTWhileStatement) {
dataFlow.pushOnStack(NodeType.WHILE_LAST_STATEMENT, dataFlow.getLast());
} else if (node.jjtGetParent() instanceof ASTForStatement) {
dataFlow.pushOnStack(NodeType.FOR_END, dataFlow.getLast());
} else if (node.jjtGetParent() instanceof ASTLabeledStatement) {
dataFlow.pushOnStack(NodeType.LABEL_LAST_STATEMENT, dataFlow.getLast());
}
return data;
}
public Object visit(ASTSwitchStatement node, Object data) {
if (!(data instanceof Structure)) {
return data;
}
Structure dataFlow = (Structure) data;
super.visit(node, data);
dataFlow.pushOnStack(NodeType.SWITCH_END, dataFlow.getLast());
return data;
}
public Object visit(ASTSwitchLabel node, Object data) {
if (!(data instanceof Structure)) {
return data;
}
Structure dataFlow = (Structure) data;
//super.visit(node, data);
if (node.jjtGetNumChildren() == 0) {
dataFlow.pushOnStack(NodeType.SWITCH_LAST_DEFAULT_STATEMENT, dataFlow.getLast());
} else {
dataFlow.pushOnStack(NodeType.CASE_LAST_STATEMENT, dataFlow.getLast());
}
return data;
}
public Object visit(ASTBreakStatement node, Object data) {
if (!(data instanceof Structure)) {
return data;
}
Structure dataFlow = (Structure) data;
dataFlow.createNewNode(node);
dataFlow.pushOnStack(NodeType.BREAK_STATEMENT, dataFlow.getLast());
return super.visit(node, data);
}
public Object visit(ASTContinueStatement node, Object data) {
if (!(data instanceof Structure)) {
return data;
}
Structure dataFlow = (Structure) data;
dataFlow.createNewNode(node);
dataFlow.pushOnStack(NodeType.CONTINUE_STATEMENT, dataFlow.getLast());
return super.visit(node, data);
}
public Object visit(ASTReturnStatement node, Object data) {
if (!(data instanceof Structure)) {
return data;
}
Structure dataFlow = (Structure) data;
dataFlow.createNewNode(node);
dataFlow.pushOnStack(NodeType.RETURN_STATEMENT, dataFlow.getLast());
return super.visit(node, data);
}
public Object visit(ASTThrowStatement node, Object data) {
if (!(data instanceof Structure)) {
return data;
}
Structure dataFlow = (Structure) data;
dataFlow.createNewNode(node);
dataFlow.pushOnStack(NodeType.THROW_STATEMENT, dataFlow.getLast());
return super.visit(node, data);
}
/*
* The method handles the special "for" loop. It creates always an
* expression node even if the loop looks like for(;;).
* */
private void addForExpressionNode(SimpleNode node, Structure dataFlow) {
ASTForStatement parent = (ASTForStatement) node.jjtGetParent();
boolean hasExpressionChild = false;
boolean hasForInitNode = false;
boolean hasForUpdateNode = false;
for (int i = 0; i < parent.jjtGetNumChildren(); i++) {
if (parent.jjtGetChild(i) instanceof ASTExpression)
hasExpressionChild = true;
else if (parent.jjtGetChild(i) instanceof ASTForUpdate)
hasForUpdateNode = true;
else if (parent.jjtGetChild(i) instanceof ASTForInit)
hasForInitNode = true;
}
if (!hasExpressionChild) {
if (node instanceof ASTForInit) {
dataFlow.createNewNode(node);
dataFlow.pushOnStack(NodeType.FOR_EXPR, dataFlow.getLast());
} else if (node instanceof ASTForUpdate) {
if (!hasForInitNode) {
dataFlow.createNewNode(node);
dataFlow.pushOnStack(NodeType.FOR_EXPR, dataFlow.getLast());
}
} else if (node instanceof ASTStatement) {
if (!hasForInitNode && !hasForUpdateNode) {
dataFlow.createNewNode(node);
dataFlow.pushOnStack(NodeType.FOR_EXPR, dataFlow.getLast());
}
}
}
}
}
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