ConstantToDependentsMapping previousConstantToDependentsMapping = previousCompilerApiData == null ? null : previousCompilerApiData.getConstantToClassMapping();
            Map<String, Set<String>> previousSourceClassesMapping = previousCompilerApiData == null ? null : previousCompilerApiData.getSourceToClassMapping();
            if (result instanceof ApiCompilerResult) {

                pending.addAll(dependencies.get(cls));
            }
        }

        Set<String> usedConstantSources = compilerApiData.isSupportsConstantsMapping()
            ? compilerApiData.getConstantToClassMapping().getConstantDependents().keySet()
            : classesToConstants.keySet();

        usedClasses.addAll(usedConstantSources);

        Map<String, HashCode> classHashes = new HashMap<>(usedClasses.size());