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package com.sun.tools.jdeps;
import static com.sun.tools.jdeps.JdepsFilter.DEFAULT_FILTER;
import static com.sun.tools.jdeps.Module.*;
import static java.lang.module.ModuleDescriptor.Requires.Modifier.*;
import static java.util.stream.Collectors.*;
import com.sun.tools.classfile.Dependency;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.module.ModuleDescriptor;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* Analyze module dependences and compare with module descriptor.
* Also identify any qualified exports not used by the target module.
*/
public class ModuleAnalyzer {
private static final String JAVA_BASE = "java.base";
private final JdepsConfiguration configuration;
private final PrintWriter log;
private final DependencyFinder dependencyFinder;
private final Map<Module, ModuleDeps> modules;
public ModuleAnalyzer(JdepsConfiguration config,
PrintWriter log,
Set<String> names) {
this.configuration = config;
this.log = log;
this.dependencyFinder = new DependencyFinder(config, DEFAULT_FILTER);
if (names.isEmpty()) {
this.modules = configuration.rootModules().stream()
.collect(toMap(Function.identity(), ModuleDeps::new));
} else {
this.modules = names.stream()
.map(configuration::findModule)
.flatMap(Optional::stream)
.collect(toMap(Function.identity(), ModuleDeps::new));
}
}
public boolean run(boolean ignoreMissingDeps) throws IOException {
try {
for (ModuleDeps md: modules.values()) {
// compute "requires transitive" dependences
md.computeRequiresTransitive(ignoreMissingDeps);
// compute "requires" dependences
md.computeRequires(ignoreMissingDeps);
// print module descriptor
md.printModuleDescriptor();
// apply transitive reduction and reports recommended requires.
boolean ok = md.analyzeDeps();
if (!ok) return false;
if (ignoreMissingDeps && md.hasMissingDependencies()) {
log.format("Warning: --ignore-missing-deps specified. Missing dependencies from %s are ignored%n",
md.root.name());
}
}
} finally {
dependencyFinder.shutdown();
}
return true;
}
class ModuleDeps {
final Module root;
Set<Module> requiresTransitive;
Set<Module> requires;
Map<String, Set<String>> unusedQualifiedExports;
ModuleDeps(Module root) {
this.root = root;
}
/**
* Compute 'requires transitive' dependences by analyzing API dependencies
*/
private void computeRequiresTransitive(boolean ignoreMissingDeps) {
// record requires transitive
this.requiresTransitive = computeRequires(true, ignoreMissingDeps)
.filter(m -> !m.name().equals(JAVA_BASE))
.collect(toSet());
trace("requires transitive: %s%n", requiresTransitive);
}
private void computeRequires(boolean ignoreMissingDeps) {
this.requires = computeRequires(false, ignoreMissingDeps).collect(toSet());
trace("requires: %s%n", requires);
}
private Stream<Module> computeRequires(boolean apionly, boolean ignoreMissingDeps) {
// analyze all classes
if (apionly) {
dependencyFinder.parseExportedAPIs(Stream.of(root));
} else {
dependencyFinder.parse(Stream.of(root));
}
// find the modules of all the dependencies found
return dependencyFinder.getDependences(root)
.filter(a -> !(ignoreMissingDeps && Analyzer.notFound(a)))
.map(Archive::getModule);
}
boolean hasMissingDependencies() {
return dependencyFinder.getDependences(root).anyMatch(Analyzer::notFound);
}
ModuleDescriptor descriptor() {
return descriptor(requiresTransitive, requires);
}
private ModuleDescriptor descriptor(Set<Module> requiresTransitive,
Set<Module> requires) {
ModuleDescriptor.Builder builder = ModuleDescriptor.newModule(root.name());
if (!root.name().equals(JAVA_BASE))
builder.requires(Set.of(MANDATED), JAVA_BASE);
requiresTransitive.stream()
.filter(m -> !m.name().equals(JAVA_BASE))
.map(Module::name)
.forEach(mn -> builder.requires(Set.of(TRANSITIVE), mn));
requires.stream()
.filter(m -> !requiresTransitive.contains(m))
.filter(m -> !m.name().equals(JAVA_BASE))
.map(Module::name)
.forEach(mn -> builder.requires(mn));
return builder.build();
}
private Graph<Module> buildReducedGraph() {
ModuleGraphBuilder rpBuilder = new ModuleGraphBuilder(configuration);
rpBuilder.addModule(root);
requiresTransitive.stream()
.forEach(m -> rpBuilder.addEdge(root, m));
// requires transitive graph
Graph<Module> rbg = rpBuilder.build().reduce();
ModuleGraphBuilder gb = new ModuleGraphBuilder(configuration);
gb.addModule(root);
requires.stream()
.forEach(m -> gb.addEdge(root, m));
// transitive reduction
Graph<Module> newGraph = gb.buildGraph().reduce(rbg);
if (DEBUG) {
System.err.println("after transitive reduction: ");
newGraph.printGraph(log);
}
return newGraph;
}
/**
* Apply the transitive reduction on the module graph
* and returns the corresponding ModuleDescriptor
*/
ModuleDescriptor reduced() {
Graph<Module> g = buildReducedGraph();
return descriptor(requiresTransitive, g.adjacentNodes(root));
}
private void showMissingDeps() {
// build the analyzer if there are missing dependences
Analyzer analyzer = new Analyzer(configuration, Analyzer.Type.CLASS, DEFAULT_FILTER);
analyzer.run(Set.of(root), dependencyFinder.locationToArchive());
log.println("Error: Missing dependencies: classes not found from the module path.");
Analyzer.Visitor visitor = new Analyzer.Visitor() {
@Override
public void visitDependence(String origin, Archive originArchive, String target, Archive targetArchive) {
log.format(" %-50s -> %-50s %s%n", origin, target, targetArchive.getName());
}
};
analyzer.visitDependences(root, visitor, Analyzer.Type.VERBOSE, Analyzer::notFound);
log.println();
}
/**
* Apply transitive reduction on the resulting graph and reports
* recommended requires.
*/
private boolean analyzeDeps() {
if (requires.stream().anyMatch(m -> m == UNNAMED_MODULE)) {
showMissingDeps();
return false;
}
ModuleDescriptor analyzedDescriptor = descriptor();
if (!matches(root.descriptor(), analyzedDescriptor)) {
log.format(" [Suggested module descriptor for %s]%n", root.name());
analyzedDescriptor.requires()
.stream()
.sorted(Comparator.comparing(ModuleDescriptor.Requires::name))
.forEach(req -> log.format(" requires %s;%n", req));
}
ModuleDescriptor reduced = reduced();
if (!matches(root.descriptor(), reduced)) {
log.format(" [Transitive reduced graph for %s]%n", root.name());
reduced.requires()
.stream()
.sorted(Comparator.comparing(ModuleDescriptor.Requires::name))
.forEach(req -> log.format(" requires %s;%n", req));
}
checkQualifiedExports();
log.println();
return true;
}
private void checkQualifiedExports() {
// detect any qualified exports not used by the target module
unusedQualifiedExports = unusedQualifiedExports();
if (!unusedQualifiedExports.isEmpty())
log.format(" [Unused qualified exports in %s]%n", root.name());
unusedQualifiedExports.keySet().stream()
.sorted()
.forEach(pn -> log.format(" exports %s to %s%n", pn,
unusedQualifiedExports.get(pn).stream()
.sorted()
.collect(joining(","))));
}
void printModuleDescriptor() {
printModuleDescriptor(log, root);
}
private void printModuleDescriptor(PrintWriter out, Module module) {
ModuleDescriptor descriptor = module.descriptor();
out.format("%s (%s)%n", descriptor.name(), module.location());
if (descriptor.name().equals(JAVA_BASE))
return;
out.println(" [Module descriptor]");
descriptor.requires()
.stream()
.sorted(Comparator.comparing(ModuleDescriptor.Requires::name))
.forEach(req -> out.format(" requires %s;%n", req));
}
/**
* Detects any qualified exports not used by the target module.
*/
private Map<String, Set<String>> unusedQualifiedExports() {
Map<String, Set<String>> unused = new HashMap<>();
// build the qualified exports map
Map<String, Set<String>> qualifiedExports =
root.exports().entrySet().stream()
.filter(e -> !e.getValue().isEmpty())
.map(Map.Entry::getKey)
.collect(toMap(Function.identity(), _k -> new HashSet<>()));
Set<Module> mods = new HashSet<>();
root.exports().values()
.stream()
.flatMap(Set::stream)
.forEach(target -> configuration.findModule(target)
.ifPresentOrElse(mods::add,
() -> log.format("Warning: %s not found%n", target))
);
// parse all target modules
dependencyFinder.parse(mods.stream());
// adds to the qualified exports map if a module references it
mods.stream().forEach(m ->
m.getDependencies()
.map(Dependency.Location::getPackageName)
.filter(qualifiedExports::containsKey)
.forEach(pn -> qualifiedExports.get(pn).add(m.name())));
// compare with the exports from ModuleDescriptor
Set<String> staleQualifiedExports =
qualifiedExports.keySet().stream()
.filter(pn -> !qualifiedExports.get(pn).equals(root.exports().get(pn)))
.collect(toSet());
if (!staleQualifiedExports.isEmpty()) {
for (String pn : staleQualifiedExports) {
Set<String> targets = new HashSet<>(root.exports().get(pn));
targets.removeAll(qualifiedExports.get(pn));
unused.put(pn, targets);
}
}
return unused;
}
}
private boolean matches(ModuleDescriptor md, ModuleDescriptor other) {
// build requires transitive from ModuleDescriptor
Set<ModuleDescriptor.Requires> reqTransitive = md.requires().stream()
.filter(req -> req.modifiers().contains(TRANSITIVE))
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