/**
* Given an input in JavaScript, get a control flow graph for it.
*
* @param input Input JavaScript.
*/
private ControlFlowGraph<Node> createCfg(String input,
boolean runSynBlockPass) {
Compiler compiler = new Compiler();
ControlFlowAnalysis cfa = new ControlFlowAnalysis(compiler, true, true);
Node root = compiler.parseSyntheticCode("cfgtest", input);
if (runSynBlockPass) {
CreateSyntheticBlocks pass = new CreateSyntheticBlocks(
compiler, "START", "END");
pass.process(null, root);
}
cfa.process(null, root);
return cfa.getCfg();
}
/**
* Given an input in JavaScript, test if the control flow analysis
* creates the proper control flow graph by comparing the expected
* Dot file output.
*
* @param input Input JavaScript.
* @param expected Expected Graphviz Dot file.
* @param shouldTraverseFunctions Whether to traverse functions when
* constructing the CFG (true by default). Passed in to the
* constructor of {@link ControlFlowAnalysis}.
*/
private void testCfg(String input, String expected,
boolean shouldTraverseFunctions) {
Compiler compiler = new Compiler();
ControlFlowAnalysis cfa =
new ControlFlowAnalysis(compiler, shouldTraverseFunctions, true);
Node root = compiler.parseSyntheticCode("cfgtest", input);
cfa.process(null, root);
ControlFlowGraph<Node> cfg = cfa.getCfg();
try {
assertEquals(expected, DotFormatter.toDot(root, cfg));
} catch (java.io.IOException e) {
fail("Tests failed with IOExceptions");
}
}