/**
* Sanity checks code generation by performing it once, parsing the result, then generating code
* from the second parse tree to verify that it matches the code generated from the first parse
* tree.
*
* @return The regenerated parse tree. Null on error.
*/
private Node sanityCheckCodeGeneration(Node root) {
if (compiler.hasHaltingErrors()) {
// Don't even bother checking code generation if we already know the
// the code is bad.
return null;
}
String source = compiler.toSource(root);
Node root2 = compiler.parseSyntheticCode(source);
if (compiler.hasHaltingErrors()) {
compiler.report(
JSError.make(
CANNOT_PARSE_GENERATED_CODE, Strings.truncateAtMaxLength(source, 100, true)));
// Throw an exception, so that the infrastructure will tell us
// which pass violated the sanity check.
throw new IllegalStateException("Sanity Check failed");
}
String source2 = compiler.toSource(root2);
if (!source.equals(source2)) {
compiler.report(
JSError.make(
GENERATED_BAD_CODE,
Strings.truncateAtMaxLength(source, 1000, true),
Strings.truncateAtMaxLength(source2, 1000, true)));
// Throw an exception, so that the infrastructure will tell us
// which pass violated the sanity check.
throw new IllegalStateException("Sanity Check failed");
}
return root2;
}
