Add initial support for whole program analysis in transformers

asm/src/main/java/dev/openrs2/asm/Transformer.java

@@ -1,5 +1,6 @@
 package dev.openrs2.asm;
 
+import dev.openrs2.asm.classpath.ClassPath;
 import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.tree.ClassNode;
 import org.objectweb.asm.tree.FieldNode;
@@ -7,9 +8,10 @@ import org.objectweb.asm.tree.MethodNode;
 import org.objectweb.asm.tree.analysis.AnalyzerException;
 
 public abstract class Transformer {
-	public void transform(Library library) throws AnalyzerException {
+	public void transform(ClassPath classPath) throws AnalyzerException {
-		preTransform(library);
+		preTransform(classPath);
 
+		for (var library : classPath.getLibraries()) {
 			for (var clazz : library) {
 				transformClass(clazz);
 
@@ -25,11 +27,12 @@ public abstract class Transformer {
 					}
 				}
 			}
+		}
 
-		postTransform(library);
+		postTransform(classPath);
 	}
 
-	public void preTransform(Library library) throws AnalyzerException {
+	public void preTransform(ClassPath classPath) throws AnalyzerException {
 		/* empty */
 	}
 
@@ -49,7 +52,7 @@ public abstract class Transformer {
 		/* empty */
 	}
 
-	public void postTransform(Library library) throws AnalyzerException {
+	public void postTransform(ClassPath classPath) throws AnalyzerException {
 		/* empty */
 	}
 }

asm/src/main/java/dev/openrs2/asm/classpath/ClassPath.java

@@ -13,6 +13,7 @@ import dev.openrs2.asm.MemberDesc;
 import dev.openrs2.asm.MemberRef;
 import dev.openrs2.util.collect.DisjointSet;
 import dev.openrs2.util.collect.ForestDisjointSet;
+import org.objectweb.asm.tree.ClassNode;
 
 public final class ClassPath {
 	private final ClassLoader runtime;
@@ -25,6 +26,10 @@ public final class ClassPath {
 		this.libraries = libraries;
 	}
 
+	public List<Library> getLibraries() {
+		return libraries;
+	}
+
 	public List<ClassMetadata> getLibraryClasses() {
 		var classes = new ArrayList<ClassMetadata>();
 
@@ -75,6 +80,16 @@ public final class ClassPath {
 		return metadata;
 	}
 
+	public ClassNode getNode(String name) {
+		for (var library : libraries) {
+			var clazz = library.get(name);
+			if (clazz != null) {
+				return clazz;
+			}
+		}
+		return null;
+	}
+
 	public DisjointSet<MemberRef> createInheritedFieldSets() {
 		var disjointSet = new ForestDisjointSet<MemberRef>();
 		var ancestorCache = new HashMap<ClassMetadata, Set<MemberDesc>>();

deob/src/main/java/dev/openrs2/deob/Deobfuscator.java

@@ -5,7 +5,6 @@ import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.List;
-import java.util.Map;
 
 import dev.openrs2.asm.Library;
 import dev.openrs2.asm.Transformer;
@@ -67,27 +66,6 @@ public final class Deobfuscator {
 		logger.info("Moving signed classes from loader_gl to runescape_gl");
 		var glSignedClasses = SignedClassSet.create(glLoader, glClient);
 
-		/* deobfuscate */
-		var allLibraries = Map.of(
-			"unpacker", unpacker,
-			"unpacker_gl", glUnpacker,
-			"loader", loader,
-			"loader_gl", glLoader,
-			"jaggl", gl,
-			"runescape", client,
-			"runescape_gl", glClient,
-			"runescape_unsigned", unsignedClient
-		);
-
-		for (var entry : allLibraries.entrySet()) {
-			logger.info("Transforming library {}", entry.getKey());
-
-			for (var transformer : TRANSFORMERS) {
-				logger.info("Running transformer {}", transformer.getClass().getSimpleName());
-				transformer.transform(entry.getValue());
-			}
-		}
-
 		/* move unpack class out of the loader (so the unpacker and loader can both depend on it) */
 		logger.info("Moving unpack from loader to unpack");
 		var unpack = new Library();
@@ -113,45 +91,54 @@ public final class Deobfuscator {
 		ClassNamePrefixer.addPrefix(unpacker, "unpacker_");
 		ClassNamePrefixer.addPrefix(glUnpacker, "unpacker_");
 
-		/* remap all class, method and field names */
+		/* bundle libraries together into a common classpath */
-		logger.info("Creating remappers");
 		var runtime = ClassLoader.getPlatformClassLoader();
+		var classPath = new ClassPath(runtime, List.of(), List.of(client, loader, signLink, unpack, unpacker));
+		var glClassPath = new ClassPath(runtime, List.of(gl), List.of(glClient, glLoader, glSignLink, glUnpack, glUnpacker));
+		var unsignedClassPath = new ClassPath(runtime, List.of(), List.of(unsignedClient));
+
+		/* deobfuscate */
+		logger.info("Transforming client");
+		for (var transformer : TRANSFORMERS) {
+			logger.info("Running transformer {}", transformer.getClass().getSimpleName());
+			transformer.transform(classPath);
+		}
 
-		var libraries = List.of(client, loader, signLink, unpack, unpacker);
+		logger.info("Transforming client_gl");
-		var remapper = TypedRemapper.create(new ClassPath(runtime, List.of(), libraries));
+		for (var transformer : TRANSFORMERS) {
+			logger.info("Running transformer {}", transformer.getClass().getSimpleName());
+			transformer.transform(glClassPath);
+		}
 
-		var glLibraries = List.of(glClient, glLoader, glSignLink, glUnpack, glUnpacker);
+		logger.info("Transforming client_unsigned");
-		var glRemapper = TypedRemapper.create(new ClassPath(runtime, List.of(gl), glLibraries));
+		for (var transformer : TRANSFORMERS) {
+			logger.info("Running transformer {}", transformer.getClass().getSimpleName());
+			transformer.transform(unsignedClassPath);
+		}
 
-		var unsignedRemapper = TypedRemapper.create(new ClassPath(runtime, List.of(), List.of(unsignedClient)));
+		/* remap all class, method and field names */
+		logger.info("Creating remappers");
+		var remapper = TypedRemapper.create(classPath);
+		var glRemapper = TypedRemapper.create(glClassPath);
+		var unsignedRemapper = TypedRemapper.create(unsignedClassPath);
 
 		/* transform Class.forName() calls */
 		logger.info("Transforming Class.forName() calls");
 		Transformer transformer = new ClassForNameTransformer(remapper);
-		for (var library : libraries) {
+		transformer.transform(classPath);
-			transformer.transform(library);
-		}
 
 		transformer = new ClassForNameTransformer(glRemapper);
-		for (var library : glLibraries) {
+		transformer.transform(glClassPath);
-			transformer.transform(library);
-		}
 
 		transformer = new ClassForNameTransformer(unsignedRemapper);
-		transformer.transform(unsignedClient);
+		transformer.transform(unsignedClassPath);
 
 		/* add @OriginalName annotations */
 		logger.info("Annotating classes and members with original names");
 		transformer = new OriginalNameTransformer();
-		for (var library : libraries) {
+		transformer.transform(classPath);
-			transformer.transform(library);
+		transformer.transform(glClassPath);
-		}
+		transformer.transform(unsignedClassPath);
-
-		for (var library : glLibraries) {
-			transformer.transform(library);
-		}
-
-		transformer.transform(unsignedClient);
 
 		/* write output jars */
 		logger.info("Writing output jars");

deob/src/main/java/dev/openrs2/deob/remap/ClassNamePrefixer.java

@@ -4,6 +4,7 @@ import java.util.HashMap;
 
 import dev.openrs2.asm.Library;
 import dev.openrs2.deob.transform.ClassForNameTransformer;
+import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.commons.ClassRemapper;
 import org.objectweb.asm.commons.SimpleRemapper;
 import org.objectweb.asm.tree.ClassNode;
@@ -22,7 +23,13 @@ public final class ClassNamePrefixer {
 		var remapper = new SimpleRemapper(mapping);
 
 		var transformer = new ClassForNameTransformer(remapper);
-		transformer.transform(library);
+		for (var clazz : library) {
+			for (var method : clazz.methods) {
+				if ((method.access & (Opcodes.ACC_NATIVE | Opcodes.ACC_ABSTRACT)) == 0) {
+					transformer.transformCode(clazz, method);
+				}
+			}
+		}
 
 		for (var name : mapping.keySet()) {
 			var in = library.remove(name);

deob/src/main/java/dev/openrs2/deob/transform/BitShiftTransformer.java

@@ -4,8 +4,8 @@ import java.util.Set;
 
 import dev.openrs2.asm.InsnMatcher;
 import dev.openrs2.asm.InsnNodeUtils;
-import dev.openrs2.asm.Library;
 import dev.openrs2.asm.Transformer;
+import dev.openrs2.asm.classpath.ClassPath;
 import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.tree.ClassNode;
 import org.objectweb.asm.tree.MethodNode;
@@ -21,7 +21,7 @@ public final class BitShiftTransformer extends Transformer {
 	private int simplified;
 
 	@Override
-	public void preTransform(Library library) {
+	public void preTransform(ClassPath classPath) {
 		simplified = 0;
 	}
 
@@ -42,7 +42,7 @@ public final class BitShiftTransformer extends Transformer {
 	}
 
 	@Override
-	public void postTransform(Library library) {
+	public void postTransform(ClassPath classPath) {
 		logger.info("Simplified {} bit shifts", simplified);
 	}
 }

deob/src/main/java/dev/openrs2/deob/transform/CounterTransformer.java

@@ -6,9 +6,9 @@ import java.util.Map;
 import java.util.Set;
 
 import dev.openrs2.asm.InsnMatcher;
-import dev.openrs2.asm.Library;
 import dev.openrs2.asm.MemberRef;
 import dev.openrs2.asm.Transformer;
+import dev.openrs2.asm.classpath.ClassPath;
 import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.tree.AbstractInsnNode;
 import org.objectweb.asm.tree.ClassNode;
@@ -26,13 +26,14 @@ public final class CounterTransformer extends Transformer {
 	private final Set<MemberRef> counters = new HashSet<>();
 
 	@Override
-	public void preTransform(Library library) {
+	public void preTransform(ClassPath classPath) {
 		counters.clear();
 
 		var references = new HashMap<MemberRef, Integer>();
 		var resets = new HashMap<MemberRef, Integer>();
 		var increments = new HashMap<MemberRef, Integer>();
 
+		for (var library : classPath.getLibraries()) {
 			for (var clazz : library) {
 				for (var method : clazz.methods) {
 					if ((method.access & (Opcodes.ACC_NATIVE | Opcodes.ACC_ABSTRACT)) == 0) {
@@ -40,8 +41,9 @@ public final class CounterTransformer extends Transformer {
 					}
 				}
 			}
+		}
 
-		deleteCounters(library, references, resets, increments);
+		deleteCounters(classPath, references, resets, increments);
 	}
 
 	private void findCounters(MethodNode method, Map<MemberRef, Integer> references, Map<MemberRef, Integer> resets, Map<MemberRef, Integer> increments) {
@@ -68,7 +70,7 @@ public final class CounterTransformer extends Transformer {
 		});
 	}
 
-	private void deleteCounters(Library library, Map<MemberRef, Integer> references, Map<MemberRef, Integer> resets, Map<MemberRef, Integer> increments) {
+	private void deleteCounters(ClassPath classPath, Map<MemberRef, Integer> references, Map<MemberRef, Integer> resets, Map<MemberRef, Integer> increments) {
 		for (Map.Entry<MemberRef, Integer> entry : references.entrySet()) {
 			var counter = entry.getKey();
 
@@ -84,7 +86,7 @@ public final class CounterTransformer extends Transformer {
 				continue;
 			}
 
-			ClassNode owner = library.get(counter.getOwner());
+			ClassNode owner = classPath.getNode(counter.getOwner());
 			owner.fields.removeIf(f -> f.name.equals(counter.getName()) && f.desc.equals(counter.getDesc()));
 
 			counters.add(counter);
@@ -112,7 +114,7 @@ public final class CounterTransformer extends Transformer {
 	}
 
 	@Override
-	public void postTransform(Library library) {
+	public void postTransform(ClassPath classPath) {
 		logger.info("Removed {} counters", counters.size());
 	}
 }

deob/src/main/java/dev/openrs2/deob/transform/ExceptionTracingTransformer.java

@@ -2,8 +2,8 @@ package dev.openrs2.deob.transform;
 
 import dev.openrs2.asm.InsnMatcher;
 import dev.openrs2.asm.InsnNodeUtils;
-import dev.openrs2.asm.Library;
 import dev.openrs2.asm.Transformer;
+import dev.openrs2.asm.classpath.ClassPath;
 import org.objectweb.asm.tree.ClassNode;
 import org.objectweb.asm.tree.MethodNode;
 import org.slf4j.Logger;
@@ -17,7 +17,7 @@ public final class ExceptionTracingTransformer extends Transformer {
 	private int tracingTryCatches;
 
 	@Override
-	public void preTransform(Library library) {
+	public void preTransform(ClassPath classPath) {
 		tracingTryCatches = 0;
 	}
 
@@ -39,7 +39,7 @@ public final class ExceptionTracingTransformer extends Transformer {
 	}
 
 	@Override
-	public void postTransform(Library library) {
+	public void postTransform(ClassPath classPath) {
 		logger.info("Removed {} tracing try/catch blocks", tracingTryCatches);
 	}
 }

deob/src/main/java/dev/openrs2/deob/transform/OpaquePredicateTransformer.java

@@ -8,6 +8,7 @@ import dev.openrs2.asm.InsnMatcher;
 import dev.openrs2.asm.Library;
 import dev.openrs2.asm.MemberRef;
 import dev.openrs2.asm.Transformer;
+import dev.openrs2.asm.classpath.ClassPath;
 import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.tree.AbstractInsnNode;
 import org.objectweb.asm.tree.ClassNode;
@@ -29,11 +30,12 @@ public final class OpaquePredicateTransformer extends Transformer {
 	private int opaquePredicates, stores;
 
 	@Override
-	public void preTransform(Library library) {
+	public void preTransform(ClassPath classPath) {
 		flowObstructors.clear();
 		opaquePredicates = 0;
 		stores = 0;
 
+		for (var library : classPath.getLibraries()) {
 			for (var clazz : library) {
 				for (var method : clazz.methods) {
 					if ((method.access & (Opcodes.ACC_NATIVE | Opcodes.ACC_ABSTRACT)) == 0) {
@@ -41,6 +43,7 @@ public final class OpaquePredicateTransformer extends Transformer {
 					}
 				}
 			}
+		}
 
 		logger.info("Identified flow obstructors {}", flowObstructors);
 	}
@@ -113,7 +116,7 @@ public final class OpaquePredicateTransformer extends Transformer {
 	}
 
 	@Override
-	public void postTransform(Library library) {
+	public void postTransform(ClassPath classPath) {
 		logger.info("Removed {} opaque predicates and {} redundant stores", opaquePredicates, stores);
 	}
 }