--- a/jdk/test/java/dyn/indify/Indify.java Wed Jul 05 17:38:31 2017 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,1890 +0,0 @@
-/*
- * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-package indify;
-
-import java.util.*;
-import java.io.*;
-import java.lang.reflect.Modifier;
-import java.util.regex.*;
-
-/**
- * Transform one or more class files to incorporate JSR 292 features,
- * such as {@code invokedynamic}.
- * <p>
- * This is a standalone program in a single source file.
- * In this form, it may be useful for test harnesses, small experiments, and javadoc examples.
- * Copies of this file may show up in multiple locations for standalone usage.
- * The primary maintained location of this file is as follows:
- * <a href="http://kenai.com/projects/ninja/sources/indify-repo/content/src/indify/Indify.java">
- * http://kenai.com/projects/ninja/sources/indify-repo/content/src/indify/Indify.java</a>
- * <p>
- * Static private methods named MH_x and MT_x (where x is arbitrary)
- * must be stereotyped generators of MethodHandle and MethodType
- * constants. All calls to them are transformed to {@code CONSTANT_MethodHandle}
- * and {@code CONSTANT_MethodType} "ldc" instructions.
- * The stereotyped code must create method types by calls to {@code methodType} or
- * {@code fromMethodDescriptorString}. The "lookup" argument must be created
- * by calls to {@code java.dyn.MethodHandles#lookup MethodHandles.lookup}.
- * The class and string arguments must be constant.
- * The following methods of {@code java.dyn.MethodHandle.Lookup Lookup} are
- * allowed for method handle creation: {@code findStatic}, {@code findVirtual},
- * {@code findConstructor}, {@code findSpecial},
- * {@code findGetter}, {@code findSetter},
- * {@code findStaticGetter}, or {@code findStaticSetter}.
- * The call to one of these methods must be followed immediately
- * by an {@code areturn} instruction.
- * The net result of the call to the MH_x or MT_x method must be
- * the creation of a constant method handle. Thus, replacing calls
- * to MH_x or MT_x methods by {@code ldc} instructions should leave
- * the meaning of the program unchanged.
- * <p>
- * Static private methods named INDY_x must be stereotyped generators
- * of {@code invokedynamic} call sites.
- * All calls to them must be immediately followed by
- * {@code invokeExact} calls.
- * All such pairs of calls are transformed to {@code invokedynamic}
- * instructions. Each INDY_x method must begin with a call to a
- * MH_x method, which is taken to be its bootstrap method.
- * The method must be immediately invoked (via {@code invokeGeneric}
- * on constant lookup, name, and type arguments. An object array of
- * constants may also be appended to the {@code invokeGeneric call}.
- * This call must be cast to {@code CallSite}, and the result must be
- * immediately followed by a call to {@code dynamicInvoker}, with the
- * resulting method handle returned.
- * <p>
- * The net result of all of these actions is equivalent to the JVM's
- * execution of an {@code invokedynamic} instruction in the unlinked state.
- * Running this code once should produce the same results as running
- * the corresponding {@code invokedynamic} instruction.
- * In order to model the caching behavior, the code of an INDY_x
- * method is allowed to begin with getstatic, aaload, and if_acmpne
- * instructions which load a static method handle value and return it
- * if the value is non-null.
- * <p>
- * Example usage:
- * <blockquote><pre>
-$ JAVA_HOME=(some recent OpenJDK 7 build)
-$ ant
-$ $JAVA_HOME/bin/java -cp build/classes indify.Indify --overwrite --dest build/testout build/classes/indify/Example.class
-$ $JAVA_HOME/bin/java -XX:+UnlockExperimentalVMOptions -XX:+EnableInvokeDynamic -cp build/classes indify.Example
-MT = (java.lang.Object)java.lang.Object
-MH = adder(int,int)java.lang.Integer
-adder(1,2) = 3
-calling indy: 42
-$ $JAVA_HOME/bin/java -XX:+UnlockExperimentalVMOptions -XX:+EnableInvokeDynamic -cp build/testout indify.Example
-(same output as above)
- * </pre></blockquote>
- * <p>
- * Before OpenJDK build b123, the format of {@code CONSTANT_InvokeDynamic} is in transition,
- * and the switch {@code --transitionalJSR292=yes} is recommended.
- * It is turned <em>off</em> by default, but users of earlier builds may need to turn it on.
- * <p>
- * A version of this transformation built on top of <a href="http://asm.ow2.org/">http://asm.ow2.org/</a> would be welcome.
- * @author John Rose
- */
-public class Indify {
- public static void main(String... av) throws IOException {
- new Indify().run(av);
- }
-
- public File dest;
- public String[] classpath = {"."};
- public boolean keepgoing = false;
- public boolean expandProperties = false;
- public boolean overwrite = false;
- public boolean quiet = false;
- public boolean verbose = false;
- public boolean transitionalJSR292 = false; // final version is distributed
- public boolean all = false;
- public int verifySpecifierCount = -1;
-
- public void run(String... av) throws IOException {
- List<String> avl = new ArrayList<>(Arrays.asList(av));
- parseOptions(avl);
- if (avl.isEmpty())
- throw new IllegalArgumentException("Usage: indify [--dest dir] [option...] file...");
- if ("--java".equals(avl.get(0))) {
- avl.remove(0);
- try {
- runApplication(avl.toArray(new String[0]));
- } catch (Exception ex) {
- if (ex instanceof RuntimeException) throw (RuntimeException) ex;
- throw new RuntimeException(ex);
- }
- return;
- }
- Exception err = null;
- for (String a : avl) {
- try {
- indify(a);
- } catch (Exception ex) {
- if (err == null) err = ex;
- System.err.println("failure on "+a);
- if (!keepgoing) break;
- }
- }
- if (err != null) {
- if (err instanceof IOException) throw (IOException) err;
- throw (RuntimeException) err;
- }
- }
-
- /** Execute the given application under a class loader which indifies all application classes. */
- public void runApplication(String... av) throws Exception {
- List<String> avl = new ArrayList<>(Arrays.asList(av));
- String mainClassName = avl.remove(0);
- av = avl.toArray(new String[0]);
- Class<?> mainClass = Class.forName(mainClassName, true, makeClassLoader());
- java.lang.reflect.Method main = mainClass.getMethod("main", String[].class);
- try { main.setAccessible(true); } catch (SecurityException ex) { }
- main.invoke(null, (Object) av);
- }
-
- public void parseOptions(List<String> av) throws IOException {
- for (; !av.isEmpty(); av.remove(0)) {
- String a = av.get(0);
- if (a.startsWith("-")) {
- String a2 = null;
- int eq = a.indexOf('=');
- if (eq > 0) {
- a2 = maybeExpandProperties(a.substring(eq+1));
- a = a.substring(0, eq+1);
- }
- switch (a) {
- case "--java":
- return; // keep this argument
- case "-d": case "--dest": case "-d=": case "--dest=":
- dest = new File(a2 != null ? a2 : maybeExpandProperties(av.remove(1)));
- break;
- case "-cp": case "--classpath":
- classpath = maybeExpandProperties(av.remove(1)).split("["+File.pathSeparatorChar+"]");
- break;
- case "-k": case "--keepgoing": case "--keepgoing=":
- keepgoing = booleanOption(a2); // print errors but keep going
- break;
- case "--expand-properties": case "--expand-properties=":
- expandProperties = booleanOption(a2); // expand property references in subsequent arguments
- break;
- case "--verify-specifier-count": case "--verify-specifier-count=":
- verifySpecifierCount = Integer.valueOf(a2);
- break;
- case "--overwrite": case "--overwrite=":
- overwrite = booleanOption(a2); // overwrite output files
- break;
- case "--all": case "--all=":
- all = booleanOption(a2); // copy all classes, even if no patterns
- break;
- case "-q": case "--quiet": case "--quiet=":
- quiet = booleanOption(a2); // less output
- break;
- case "-v": case "--verbose": case "--verbose=":
- verbose = booleanOption(a2); // more output
- break;
- case "--transitionalJSR292": case "--transitionalJSR292=":
- transitionalJSR292 = booleanOption(a2); // use older invokedynamic format
- break;
- default:
- throw new IllegalArgumentException("unrecognized flag: "+a);
- }
- continue;
- } else {
- break;
- }
- }
- if (dest == null && !overwrite)
- throw new RuntimeException("no output specified; need --dest d or --overwrite");
- if (expandProperties) {
- for (int i = 0; i < av.size(); i++)
- av.set(i, maybeExpandProperties(av.get(i)));
- }
- }
-
- private boolean booleanOption(String s) {
- if (s == null) return true;
- switch (s) {
- case "true": case "yes": case "on": case "1": return true;
- case "false": case "no": case "off": case "0": return false;
- }
- throw new IllegalArgumentException("unrecognized boolean flag="+s);
- }
-
- private String maybeExpandProperties(String s) {
- if (!expandProperties) return s;
- Set<String> propsDone = new HashSet<>();
- while (s.contains("${")) {
- int lbrk = s.indexOf("${");
- int rbrk = s.indexOf('}', lbrk);
- if (rbrk < 0) break;
- String prop = s.substring(lbrk+2, rbrk);
- if (!propsDone.add(prop)) break;
- String value = System.getProperty(prop);
- if (verbose) System.err.println("expanding ${"+prop+"} => "+value);
- if (value == null) break;
- s = s.substring(0, lbrk) + value + s.substring(rbrk+1);
- }
- return s;
- }
-
- public void indify(String a) throws IOException {
- File f = new File(a);
- String fn = f.getName();
- if (fn.endsWith(".class") && f.isFile())
- indifyFile(f, dest);
- else if (fn.endsWith(".jar") && f.isFile())
- indifyJar(f, dest);
- else if (f.isDirectory())
- indifyTree(f, dest);
- else if (!keepgoing)
- throw new RuntimeException("unrecognized file: "+a);
- }
-
- private void ensureDirectory(File dir) {
- if (dir.mkdirs() && !quiet)
- System.err.println("created "+dir);
- }
-
- public void indifyFile(File f, File dest) throws IOException {
- if (verbose) System.err.println("reading "+f);
- ClassFile cf = new ClassFile(f);
- Logic logic = new Logic(cf);
- boolean changed = logic.transform();
- logic.reportPatternMethods(quiet, keepgoing);
- if (changed || all) {
- File outfile;
- if (dest != null) {
- ensureDirectory(dest);
- outfile = classPathFile(dest, cf.nameString());
- } else {
- outfile = f; // overwrite input file, no matter where it is
- }
- cf.writeTo(outfile);
- if (!quiet) System.err.println("wrote "+outfile);
- }
- }
-
- File classPathFile(File pathDir, String className) {
- String qualname = className.replace('.','/')+".class";
- qualname = qualname.replace('/', File.separatorChar);
- return new File(pathDir, qualname);
- }
-
- public void indifyJar(File f, Object dest) throws IOException {
- throw new UnsupportedOperationException("Not yet implemented");
- }
-
- public void indifyTree(File f, File dest) throws IOException {
- if (verbose) System.err.println("reading directory: "+f);
- for (File f2 : f.listFiles(new FilenameFilter() {
- public boolean accept(File dir, String name) {
- if (name.endsWith(".class")) return true;
- if (name.contains(".")) return false;
- // return true if it might be a package name:
- return Character.isJavaIdentifierStart(name.charAt(0));
- }})) {
- if (f2.getName().endsWith(".class"))
- indifyFile(f2, dest);
- else if (f2.isDirectory())
- indifyTree(f2, dest);
- }
- }
-
- public ClassLoader makeClassLoader() {
- return new Loader();
- }
- private class Loader extends ClassLoader {
- Loader() {
- this(Indify.class.getClassLoader());
- }
- Loader(ClassLoader parent) {
- super(parent);
- }
- public Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
- File f = findClassInPath(name);
- if (f != null) {
- try {
- Class<?> c = transformAndLoadClass(f);
- if (c != null) {
- if (resolve) resolveClass(c);
- return c;
- }
- } catch (Exception ex) {
- if (ex instanceof IllegalArgumentException)
- // pass error from reportPatternMethods
- throw (IllegalArgumentException) ex;
- }
- }
- return super.loadClass(name, resolve);
- }
- private File findClassInPath(String name) {
- for (String s : classpath) {
- File f = classPathFile(new File(s), name);
- //System.out.println("Checking for "+f);
- if (f.exists() && f.canRead()) {
- return f;
- }
- }
- return null;
- }
- protected Class<?> findClass(String name) throws ClassNotFoundException {
- try {
- return transformAndLoadClass(findClassInPath(name));
- } catch (IOException ex) {
- throw new ClassNotFoundException("IO error", ex);
- }
- }
- private Class<?> transformAndLoadClass(File f) throws ClassNotFoundException, IOException {
- if (verbose) System.err.println("Loading class from "+f);
- ClassFile cf = new ClassFile(f);
- Logic logic = new Logic(cf);
- boolean changed = logic.transform();
- if (verbose && !changed) System.err.println("(no change)");
- logic.reportPatternMethods(!verbose, keepgoing);
- byte[] bytes = cf.toByteArray();
- return defineClass(null, bytes, 0, bytes.length);
- }
- }
-
- private class Logic {
- // Indify logic, per se.
- ClassFile cf;
- final char[] poolMarks;
- final Map<Method,Constant> constants = new HashMap<>();
- final Map<Method,String> indySignatures = new HashMap<>();
- Logic(ClassFile cf) {
- this.cf = cf;
- poolMarks = new char[cf.pool.size()];
- }
- boolean transform() {
- if (!initializeMarks()) return false;
- if (!findPatternMethods()) return false;
- Pool pool = cf.pool;
- //for (Constant c : cp) System.out.println(" # "+c);
- for (Method m : cf.methods) {
- if (constants.containsKey(m)) continue; // don't bother
- // Transform references.
- int blab = 0;
- for (Instruction i = m.instructions(); i != null; i = i.next()) {
- if (i.bc != opc_invokestatic) continue;
- int methi = i.u2At(1);
- if (poolMarks[methi] == 0) continue;
- Short[] ref = pool.getMemberRef((short)methi);
- Method conm = findMember(cf.methods, ref[1], ref[2]);
- if (conm == null) continue;
- Constant con = constants.get(conm);
- if (con == null) continue;
- if (blab++ == 0 && !quiet)
- System.err.println("patching "+cf.nameString()+"."+m);
- //if (blab == 1) { for (Instruction j = m.instructions(); j != null; j = j.next()) System.out.println(" |"+j); }
- if (con.tag == CONSTANT_InvokeDynamic ||
- con.tag == CONSTANT_InvokeDynamic_17) {
- // need to patch the following instruction too,
- // but there are usually intervening argument pushes too
- Instruction i2 = findPop(i);
- Short[] ref2 = null;
- short ref2i = 0;
- if (i2 != null && i2.bc == opc_invokevirtual &&
- poolMarks[(char)(ref2i = (short) i2.u2At(1))] == 'D')
- ref2 = pool.getMemberRef(ref2i);
- if (ref2 == null || !"invokeExact".equals(pool.getString(ref2[1]))) {
- System.err.println(m+": failed to create invokedynamic at "+i.pc);
- continue;
- }
- String invType = pool.getString(ref2[2]);
- String bsmType = indySignatures.get(conm);
- if (!invType.equals(bsmType)) {
- System.err.println(m+": warning: "+conm+" call type and local invoke type differ: "
- +bsmType+", "+invType);
- }
- assert(i.len == 3 || i2.len == 3);
- if (!quiet) System.err.println(i+" "+conm+";...; "+i2+" => invokedynamic "+con);
- int start = i.pc + 3, end = i2.pc;
- System.arraycopy(i.codeBase, start, i.codeBase, i.pc, end-start);
- i.forceNext(0); // force revisit of new instruction
- i2.u1AtPut(-3, opc_invokedynamic);
- i2.u2AtPut(-2, con.index);
- i2.u2AtPut(0, (short)0);
- i2.u1AtPut(2, opc_nop);
- //System.out.println(new Instruction(i.codeBase, i2.pc-3));
- } else {
- if (!quiet) System.err.println(i+" "+conm+" => ldc "+con);
- assert(i.len == 3);
- i.u1AtPut(0, opc_ldc_w);
- i.u2AtPut(1, con.index);
- }
- }
- //if (blab >= 1) { for (Instruction j = m.instructions(); j != null; j = j.next()) System.out.println(" |"+j); }
- }
- cf.methods.removeAll(constants.keySet());
- return true;
- }
-
- // Scan forward from the instruction to find where the stack p
- // below the current sp at the instruction.
- Instruction findPop(Instruction i) {
- //System.out.println("findPop from "+i);
- Pool pool = cf.pool;
- JVMState jvm = new JVMState();
- decode:
- for (i = i.clone().next(); i != null; i = i.next()) {
- String pops = INSTRUCTION_POPS[i.bc];
- //System.out.println(" "+i+" "+jvm.stack+" : "+pops.replace("$", " => "));
- if (pops == null) break;
- if (jvm.stackMotion(i.bc)) continue decode;
- if (pops.indexOf('Q') >= 0) {
- Short[] ref = pool.getMemberRef((short) i.u2At(1));
- String type = simplifyType(pool.getString(CONSTANT_Utf8, ref[2]));
- switch (i.bc) {
- case opc_getstatic:
- case opc_getfield:
- case opc_putstatic:
- case opc_putfield:
- pops = pops.replace("Q", type);
- break;
- default:
- if (!type.startsWith("("))
- throw new InternalError(i.toString());
- pops = pops.replace("Q$Q", type.substring(1).replace(")","$"));
- break;
- }
- //System.out.println("special type: "+type+" => "+pops);
- }
- int npops = pops.indexOf('$');
- if (npops < 0) throw new InternalError();
- if (npops > jvm.sp()) return i;
- List<Object> args = jvm.args(npops);
- int k = 0;
- for (Object x : args) {
- char have = (Character) x;
- char want = pops.charAt(k++);
- if (have == 'X' || want == 'X') continue;
- if (have != want) break decode;
- }
- if (pops.charAt(k++) != '$') break decode;
- args.clear();
- while (k < pops.length())
- args.add(pops.charAt(k++));
- }
- System.err.println("*** bailout on jvm: "+jvm.stack+" "+i);
- return null;
- }
-
- boolean findPatternMethods() {
- boolean found = false;
- for (char mark : "THI".toCharArray()) {
- for (Method m : cf.methods) {
- if (!Modifier.isPrivate(m.access)) continue;
- if (!Modifier.isStatic(m.access)) continue;
- if (nameAndTypeMark(m.name, m.type) == mark) {
- Constant con = scanPattern(m, mark);
- if (con == null) continue;
- constants.put(m, con);
- found = true;
- }
- }
- }
- return found;
- }
-
- void reportPatternMethods(boolean quietly, boolean allowMatchFailure) {
- if (!quietly && !constants.keySet().isEmpty())
- System.err.println("pattern methods removed: "+constants.keySet());
- for (Method m : cf.methods) {
- if (nameMark(cf.pool.getString(m.name)) != 0 &&
- constants.get(m) == null) {
- String failure = "method has special name but fails to match pattern: "+m;
- if (!allowMatchFailure)
- throw new IllegalArgumentException(failure);
- else if (!quietly)
- System.err.println("warning: "+failure);
- }
- }
- if (verifySpecifierCount >= 0) {
- List<Object[]> specs = bootstrapMethodSpecifiers(false);
- int specsLen = (specs == null ? 0 : specs.size());
- if (specsLen != verifySpecifierCount) {
- throw new IllegalArgumentException("BootstrapMethods length is "+specsLen+" but should be "+verifySpecifierCount);
- }
- }
- if (!quiet) System.err.flush();
- }
-
- // mark constant pool entries according to participation in patterns
- boolean initializeMarks() {
- boolean changed = false;
- for (;;) {
- boolean changed1 = false;
- int cpindex = -1;
- for (Constant e : cf.pool) {
- ++cpindex;
- if (e == null) continue;
- char mark = poolMarks[cpindex];
- if (mark != 0) continue;
- switch (e.tag) {
- case CONSTANT_Utf8:
- mark = nameMark(e.itemString()); break;
- case CONSTANT_NameAndType:
- mark = nameAndTypeMark(e.itemIndexes()); break;
- case CONSTANT_Class: {
- int n1 = e.itemIndex();
- char nmark = poolMarks[(char)n1];
- if ("DJ".indexOf(nmark) >= 0)
- mark = nmark;
- break;
- }
- case CONSTANT_Field:
- case CONSTANT_Method: {
- Short[] n12 = e.itemIndexes();
- short cl = n12[0];
- short nt = n12[1];
- char cmark = poolMarks[(char)cl];
- if (cmark != 0) {
- mark = cmark; // it is a java.dyn.* or java.lang.* method
- break;
- }
- String cls = cf.pool.getString(CONSTANT_Class, cl);
- if (cls.equals(cf.nameString())) {
- switch (poolMarks[(char)nt]) {
- // it is a private MH/MT/INDY method
- case 'T': case 'H': case 'I':
- mark = poolMarks[(char)nt];
- break;
- }
- }
- break;
- }
- default: break;
- }
- if (mark != 0) {
- poolMarks[cpindex] = mark;
- changed1 = true;
- }
- }
- if (!changed1)
- break;
- changed = true;
- }
- return changed;
- }
- char nameMark(String s) {
- if (s.startsWith("MT_")) return 'T';
- else if (s.startsWith("MH_")) return 'H';
- else if (s.startsWith("INDY_")) return 'I';
- else if (s.startsWith("java/dyn/")) return 'D';
- else if (s.startsWith("java/lang/")) return 'J';
- return 0;
- }
- char nameAndTypeMark(Short[] n12) {
- return nameAndTypeMark(n12[0], n12[1]);
- }
- char nameAndTypeMark(short n1, short n2) {
- char mark = poolMarks[(char)n1];
- if (mark == 0) return 0;
- String descr = cf.pool.getString(CONSTANT_Utf8, n2);
- String requiredType;
- switch (poolMarks[(char)n1]) {
- case 'H': requiredType = "()Ljava/dyn/MethodHandle;"; break;
- case 'T': requiredType = "()Ljava/dyn/MethodType;"; break;
- case 'I': requiredType = "()Ljava/dyn/MethodHandle;"; break;
- default: return 0;
- }
- if (descr.equals(requiredType)) return mark;
- return 0;
- }
-
- private class JVMState {
- final List<Object> stack = new ArrayList<>();
- int sp() { return stack.size(); }
- void push(Object x) { stack.add(x); }
- void push2(Object x) { stack.add(EMPTY_SLOT); stack.add(x); }
- void pushAt(int pos, Object x) { stack.add(stack.size()+pos, x); }
- Object pop() { return stack.remove(sp()-1); }
- Object top() { return stack.get(sp()-1); }
- List<Object> args(boolean hasRecv, String type) {
- return args(argsize(type) + (hasRecv ? 1 : 0));
- }
- List<Object> args(int argsize) {
- return stack.subList(sp()-argsize, sp());
- }
- boolean stackMotion(int bc) {
- switch (bc) {
- case opc_pop: pop(); break;
- case opc_pop2: pop(); pop(); break;
- case opc_swap: pushAt(-1, pop()); break;
- case opc_dup: push(top()); break;
- case opc_dup_x1: pushAt(-2, top()); break;
- case opc_dup_x2: pushAt(-3, top()); break;
- // ? also: dup2{,_x1,_x2}
- default: return false;
- }
- return true;
- }
- }
- private final String EMPTY_SLOT = "_";
- private void removeEmptyJVMSlots(List<Object> args) {
- for (;;) {
- int i = args.indexOf(EMPTY_SLOT);
- if (i >= 0 && i+1 < args.size()
- && (isConstant(args.get(i+1), CONSTANT_Long) ||
- isConstant(args.get(i+1), CONSTANT_Double)))
- args.remove(i);
- else break;
- }
- }
-
- private Constant scanPattern(Method m, char patternMark) {
- if (verbose) System.err.println("scan "+m+" for pattern="+patternMark);
- int wantTag;
- switch (patternMark) {
- case 'T': wantTag = CONSTANT_MethodType; break;
- case 'H': wantTag = CONSTANT_MethodHandle; break;
- case 'I': wantTag = CONSTANT_InvokeDynamic; break;
- default: throw new InternalError();
- }
- Instruction i = m.instructions();
- JVMState jvm = new JVMState();
- Pool pool = cf.pool;
- int branchCount = 0;
- Object arg;
- List<Object> args;
- List<Object> bsmArgs = null; // args to invokeGeneric
- decode:
- for (; i != null; i = i.next()) {
- //System.out.println(jvm.stack+" "+i);
- int bc = i.bc;
- switch (bc) {
- case opc_ldc: jvm.push(pool.get(i.u1At(1))); break;
- case opc_ldc_w: jvm.push(pool.get(i.u2At(1))); break;
- case opc_ldc2_w: jvm.push2(pool.get(i.u2At(1))); break;
- case opc_aconst_null: jvm.push(null); break;
- case opc_bipush: jvm.push((int)(byte) i.u1At(1)); break;
- case opc_sipush: jvm.push((int)(short)i.u2At(1)); break;
-
- // these support creation of a restarg array
- case opc_anewarray:
- arg = jvm.pop();
- if (!(arg instanceof Integer)) break decode;
- arg = Arrays.asList(new Object[(Integer)arg]);
- jvm.push(arg);
- break;
- case opc_dup:
- jvm.push(jvm.top()); break;
- case opc_aastore:
- args = jvm.args(3); // array, index, value
- if (args.get(0) instanceof List &&
- args.get(1) instanceof Integer) {
- ((List<Object>)args.get(0)).set( (Integer)args.get(1), args.get(2) );
- }
- args.clear();
- break;
-
- case opc_new:
- {
- String type = pool.getString(CONSTANT_Class, (short)i.u2At(1));
- //System.out.println("new "+type);
- switch (type) {
- case "java/lang/StringBuilder":
- jvm.push("StringBuilder");
- continue decode; // go to next instruction
- }
- break decode; // bail out
- }
-
- case opc_getstatic:
- {
- // int.class compiles to getstatic Integer.TYPE
- int fieldi = i.u2At(1);
- char mark = poolMarks[fieldi];
- //System.err.println("getstatic "+fieldi+Arrays.asList(pool.getStrings(pool.getMemberRef((short)fieldi)))+mark);
- if (mark == 'J') {
- Short[] ref = pool.getMemberRef((short) fieldi);
- String name = pool.getString(CONSTANT_Utf8, ref[1]);
- if ("TYPE".equals(name)) {
- String wrapperName = pool.getString(CONSTANT_Class, ref[0]).replace('/', '.');
- // a primitive type descriptor
- Class<?> primClass;
- try {
- primClass = (Class<?>) Class.forName(wrapperName).getField(name).get(null);
- } catch (Exception ex) {
- throw new InternalError("cannot load "+wrapperName+"."+name);
- }
- jvm.push(primClass);
- break;
- }
- }
- // unknown field; keep going...
- jvm.push(UNKNOWN_CON);
- break;
- }
- case opc_putstatic:
- {
- if (patternMark != 'I') break decode;
- jvm.pop();
- // unknown field; keep going...
- break;
- }
-
- case opc_invokestatic:
- case opc_invokevirtual:
- case opc_invokespecial:
- {
- boolean hasRecv = (bc != opc_invokestatic);
- int methi = i.u2At(1);
- char mark = poolMarks[methi];
- Short[] ref = pool.getMemberRef((short)methi);
- String type = pool.getString(CONSTANT_Utf8, ref[2]);
- //System.out.println("invoke "+pool.getString(CONSTANT_Utf8, ref[1])+" "+Arrays.asList(ref)+" : "+type);
- args = jvm.args(hasRecv, type);
- String intrinsic = null;
- Constant con;
- if (mark == 'D' || mark == 'J') {
- intrinsic = pool.getString(CONSTANT_Utf8, ref[1]);
- if (mark == 'J') {
- String cls = pool.getString(CONSTANT_Class, ref[0]);
- cls = cls.substring(1+cls.lastIndexOf('/'));
- intrinsic = cls+"."+intrinsic;
- }
- //System.out.println("recognized intrinsic "+intrinsic);
- byte refKind = -1;
- switch (intrinsic) {
- case "findGetter": refKind = REF_getField; break;
- case "findStaticGetter": refKind = REF_getStatic; break;
- case "findSetter": refKind = REF_putField; break;
- case "findStaticSetter": refKind = REF_putStatic; break;
- case "findVirtual": refKind = REF_invokeVirtual; break;
- case "findStatic": refKind = REF_invokeStatic; break;
- case "findSpecial": refKind = REF_invokeSpecial; break;
- case "findConstructor": refKind = REF_newInvokeSpecial; break;
- }
- if (refKind >= 0 && (con = parseMemberLookup(refKind, args)) != null) {
- args.clear(); args.add(con);
- continue;
- }
- }
- Method ownMethod = null;
- if (mark == 'T' || mark == 'H' || mark == 'I') {
- ownMethod = findMember(cf.methods, ref[1], ref[2]);
- }
- //if (intrinsic != null) System.out.println("intrinsic = "+intrinsic);
- switch (intrinsic == null ? "" : intrinsic) {
- case "fromMethodDescriptorString":
- con = makeMethodTypeCon(args.get(0));
- args.clear(); args.add(con);
- continue;
- case "methodType": {
- flattenVarargs(args); // there are several overloadings, some with varargs
- StringBuilder buf = new StringBuilder();
- String rtype = null;
- for (Object typeArg : args) {
- if (typeArg instanceof Class) {
- Class<?> argClass = (Class<?>) typeArg;
- if (argClass.isPrimitive()) {
- char tchar;
- switch (argClass.getName()) {
- case "void": tchar = 'V'; break;
- case "boolean": tchar = 'Z'; break;
- case "byte": tchar = 'B'; break;
- case "char": tchar = 'C'; break;
- case "short": tchar = 'S'; break;
- case "int": tchar = 'I'; break;
- case "long": tchar = 'J'; break;
- case "float": tchar = 'F'; break;
- case "double": tchar = 'D'; break;
- default: throw new InternalError(argClass.toString());
- }
- buf.append(tchar);
- } else {
- // should not happen, but...
- buf.append('L').append(argClass.getName().replace('.','/')).append(';');
- }
- } else if (typeArg instanceof Constant) {
- Constant argCon = (Constant) typeArg;
- if (argCon.tag == CONSTANT_Class) {
- String cn = pool.get(argCon.itemIndex()).itemString();
- if (cn.endsWith(";"))
- buf.append(cn);
- else
- buf.append('L').append(cn).append(';');
- } else {
- break decode;
- }
- } else {
- break decode;
- }
- if (rtype == null) {
- // first arg is treated differently
- rtype = buf.toString();
- buf.setLength(0);
- buf.append('(');
- }
- }
- buf.append(')').append(rtype);
- con = con = makeMethodTypeCon(buf.toString());
- args.clear(); args.add(con);
- continue;
- }
- case "lookup":
- case "dynamicInvoker":
- args.clear(); args.add(intrinsic);
- continue;
- case "lookupClass":
- if (args.equals(Arrays.asList("lookup"))) {
- // fold lookup().lookupClass() to the enclosing class
- args.clear(); args.add(pool.get(cf.thisc));
- continue;
- }
- break;
- case "invokeGeneric":
- case "invokeWithArguments":
- if (patternMark != 'I') break decode;
- if ("invokeWithArguments".equals(intrinsic))
- flattenVarargs(args);
- bsmArgs = new ArrayList(args);
- args.clear(); args.add("invokeGeneric");
- continue;
- case "Integer.valueOf":
- case "Float.valueOf":
- case "Long.valueOf":
- case "Double.valueOf":
- removeEmptyJVMSlots(args);
- if (args.size() == 1) {
- arg = args.remove(0);
- assert(3456 == (CONSTANT_Integer*1000 + CONSTANT_Float*100 + CONSTANT_Long*10 + CONSTANT_Double));
- if (isConstant(arg, CONSTANT_Integer + "IFLD".indexOf(intrinsic.charAt(0)))
- || arg instanceof Number) {
- args.add(arg); continue;
- }
- }
- break decode;
- case "StringBuilder.append":
- // allow calls like ("value = "+x)
- removeEmptyJVMSlots(args);
- args.subList(1, args.size()).clear();
- continue;
- case "StringBuilder.toString":
- args.clear();
- args.add(intrinsic);
- continue;
- }
- if (!hasRecv && ownMethod != null && patternMark != 0) {
- con = constants.get(ownMethod);
- if (con == null) break decode;
- args.clear(); args.add(con);
- continue;
- } else if (type.endsWith(")V")) {
- // allow calls like println("reached the pattern method")
- args.clear();
- continue;
- }
- break decode; // bail out for most calls
- }
- case opc_areturn:
- {
- ++branchCount;
- if (bsmArgs != null) {
- // parse bsmArgs as (MH, lookup, String, MT, [extra])
- Constant indyCon = makeInvokeDynamicCon(bsmArgs);
- if (indyCon != null) {
- Constant typeCon = (Constant) bsmArgs.get(3);
- indySignatures.put(m, pool.getString(typeCon.itemIndex()));
- return indyCon;
- }
- System.err.println(m+": inscrutable bsm arguments: "+bsmArgs);
- break decode; // bail out
- }
- arg = jvm.pop();
- if (branchCount == 2 && UNKNOWN_CON.equals(arg))
- break; // merge to next path
- if (isConstant(arg, wantTag))
- return (Constant) arg;
- break decode; // bail out
- }
- default:
- if (jvm.stackMotion(i.bc)) break;
- if (bc >= opc_nconst_MIN && bc <= opc_nconst_MAX)
- { jvm.push(INSTRUCTION_CONSTANTS[bc - opc_nconst_MIN]); break; }
- if (patternMark == 'I') {
- // these support caching paths in INDY_x methods
- if (bc == opc_aload || bc >= opc_aload_0 && bc <= opc_aload_MAX)
- { jvm.push(UNKNOWN_CON); break; }
- if (bc == opc_astore || bc >= opc_astore_0 && bc <= opc_astore_MAX)
- { jvm.pop(); break; }
- switch (bc) {
- case opc_getfield:
- case opc_aaload:
- jvm.push(UNKNOWN_CON); break;
- case opc_ifnull:
- case opc_ifnonnull:
- // ignore branch target
- if (++branchCount != 1) break decode;
- jvm.pop();
- break;
- case opc_checkcast:
- arg = jvm.top();
- if ("invokeWithArguments".equals(arg) ||
- "invokeGeneric".equals(arg))
- break; // assume it is a helpful cast
- break decode;
- default:
- break decode; // bail out
- }
- continue decode; // go to next instruction
- }
- break decode; // bail out
- } //end switch
- }
- System.err.println(m+": bailout on "+i+" jvm stack: "+jvm.stack);
- return null;
- }
- private final String UNKNOWN_CON = "<unknown>";
-
- private void flattenVarargs(List<Object> args) {
- int size = args.size();
- if (size > 0 && args.get(size-1) instanceof List)
- args.addAll((List<Object>) args.remove(size-1));
- }
-
- private boolean isConstant(Object x, int tag) {
- return x instanceof Constant && ((Constant)x).tag == tag;
- }
- private Constant makeMethodTypeCon(Object x) {
- short utfIndex;
- if (x instanceof String)
- utfIndex = (short) cf.pool.addConstant(CONSTANT_Utf8, x).index;
- else if (isConstant(x, CONSTANT_String))
- utfIndex = ((Constant)x).itemIndex();
- else return null;
- return cf.pool.addConstant(CONSTANT_MethodType, utfIndex);
- }
- private Constant parseMemberLookup(byte refKind, List<Object> args) {
- // E.g.: lookup().findStatic(Foo.class, "name", MethodType)
- if (args.size() != 4) return null;
- int argi = 0;
- if (!"lookup".equals(args.get(argi++))) return null;
- short refindex, cindex, ntindex, nindex, tindex;
- Object con;
- if (!isConstant(con = args.get(argi++), CONSTANT_Class)) return null;
- cindex = (short)((Constant)con).index;
- if (!isConstant(con = args.get(argi++), CONSTANT_String)) return null;
- nindex = ((Constant)con).itemIndex();
- if (isConstant(con = args.get(argi++), CONSTANT_MethodType) ||
- isConstant(con, CONSTANT_Class)) {
- tindex = ((Constant)con).itemIndex();
- } else return null;
- ntindex = (short) cf.pool.addConstant(CONSTANT_NameAndType,
- new Short[]{ nindex, tindex }).index;
- byte reftag = CONSTANT_Method;
- if (refKind <= REF_putStatic)
- reftag = CONSTANT_Field;
- else if (refKind == REF_invokeInterface)
- reftag = CONSTANT_InterfaceMethod;
- Constant ref = cf.pool.addConstant(reftag, new Short[]{ cindex, ntindex });
- return cf.pool.addConstant(CONSTANT_MethodHandle, new Object[]{ refKind, (short)ref.index });
- }
- private Constant makeInvokeDynamicCon(List<Object> args) {
- // E.g.: MH_bsm.invokeGeneric(lookup(), "name", MethodType, "extraArg")
- removeEmptyJVMSlots(args);
- if (args.size() != 4 && args.size() != 5) return null;
- int argi = 0;
- short nindex, tindex, ntindex, bsmindex;
- Object con;
- if (!isConstant(con = args.get(argi++), CONSTANT_MethodHandle)) return null;
- bsmindex = (short) ((Constant)con).index;
- if (!"lookup".equals(args.get(argi++))) return null;
- if (!isConstant(con = args.get(argi++), CONSTANT_String)) return null;
- nindex = ((Constant)con).itemIndex();
- if (!isConstant(con = args.get(argi++), CONSTANT_MethodType)) return null;
- tindex = ((Constant)con).itemIndex();
- ntindex = (short) cf.pool.addConstant(CONSTANT_NameAndType,
- new Short[]{ nindex, tindex }).index;
- if (transitionalJSR292) {
- if (argi != args.size()) {
- System.err.println("BSM specifier has extra arguments but transitionalJSR292=1");
- return null;
- }
- return cf.pool.addConstant(CONSTANT_InvokeDynamic_17,
- new Short[]{ bsmindex, ntindex });
- }
- List<Object> extraArgs = Collections.emptyList();
- if (argi < args.size()) {
- Object arg = args.get(argi);
- if (arg instanceof List)
- extraArgs = (List<Object>) arg;
- else
- extraArgs = Arrays.asList(arg);
- removeEmptyJVMSlots(args);
- }
- List<Short> extraArgIndexes = new CountedList<>(Short.class);
- for (Object x : extraArgs) {
- if (x instanceof Number) {
- Object num = null; byte numTag = 0;
- if (x instanceof Integer) { num = x; numTag = CONSTANT_Integer; }
- if (x instanceof Float) { num = Float.floatToRawIntBits((Float)x); numTag = CONSTANT_Float; }
- if (x instanceof Long) { num = x; numTag = CONSTANT_Long; }
- if (x instanceof Double) { num = Double.doubleToRawLongBits((Double)x); numTag = CONSTANT_Double; }
- if (num != null) x = cf.pool.addConstant(numTag, x);
- }
- if (!(x instanceof Constant)) return null;
- extraArgIndexes.add((short) ((Constant)x).index);
- }
- List<Object[]> specs = bootstrapMethodSpecifiers(true);
- int specindex = -1;
- Object[] spec = new Object[]{ bsmindex, extraArgIndexes };
- for (Object[] spec1 : specs) {
- if (Arrays.equals(spec1, spec)) {
- specindex = specs.indexOf(spec1);
- if (verbose) System.err.println("reusing BSM specifier: "+spec1[0]+spec1[1]);
- break;
- }
- }
- if (specindex == -1) {
- specindex = (short) specs.size();
- specs.add(spec);
- if (verbose) System.err.println("adding BSM specifier: "+spec[0]+spec[1]);
- }
- return cf.pool.addConstant(CONSTANT_InvokeDynamic,
- new Short[]{ (short)specindex, ntindex });
- }
-
- List<Object[]> bootstrapMethodSpecifiers(boolean createIfNotFound) {
- Attr bsms = cf.findAttr("BootstrapMethods");
- if (bsms == null) {
- if (!createIfNotFound) return null;
- bsms = new Attr(cf, "BootstrapMethods", new byte[]{0,0});
- assert(bsms == cf.findAttr("BootstrapMethods"));
- }
- if (bsms.item instanceof byte[]) {
- // unflatten
- List<Object[]> specs = new CountedList<>(Object[].class);
- DataInputStream in = new DataInputStream(new ByteArrayInputStream((byte[]) bsms.item));
- try {
- int len = (char) in.readShort();
- for (int i = 0; i < len; i++) {
- short bsm = in.readShort();
- int argc = (char) in.readShort();
- List<Short> argv = new CountedList<>(Short.class);
- for (int j = 0; j < argc; j++)
- argv.add(in.readShort());
- specs.add(new Object[]{ bsm, argv });
- }
- } catch (IOException ex) { throw new InternalError(); }
- bsms.item = specs;
- }
- return (List<Object[]>) bsms.item;
- }
- }
-
- private DataInputStream openInput(File f) throws IOException {
- return new DataInputStream(new BufferedInputStream(new FileInputStream(f)));
- }
-
- private DataOutputStream openOutput(File f) throws IOException {
- if (!overwrite && f.exists())
- throw new IOException("file already exists: "+f);
- ensureDirectory(f.getParentFile());
- return new DataOutputStream(new BufferedOutputStream(new FileOutputStream(f)));
- }
-
- static byte[] readRawBytes(DataInputStream in, int size) throws IOException {
- byte[] bytes = new byte[size];
- int nr = in.read(bytes);
- if (nr != size)
- throw new InternalError("wrong size: "+nr);
- return bytes;
- }
-
- private interface Chunk {
- void readFrom(DataInputStream in) throws IOException;
- void writeTo(DataOutputStream out) throws IOException;
- }
-
- private static class CountedList<T> extends ArrayList<T> implements Chunk {
- final Class<? extends T> itemClass;
- final int rowlen;
- CountedList(Class<? extends T> itemClass, int rowlen) {
- this.itemClass = itemClass;
- this.rowlen = rowlen;
- }
- CountedList(Class<? extends T> itemClass) { this(itemClass, -1); }
- public void readFrom(DataInputStream in) throws IOException {
- int count = in.readUnsignedShort();
- while (size() < count) {
- if (rowlen < 0) {
- add(readInput(in, itemClass));
- } else {
- Class<?> elemClass = itemClass.getComponentType();
- Object[] row = (Object[]) java.lang.reflect.Array.newInstance(elemClass, rowlen);
- for (int i = 0; i < rowlen; i++)
- row[i] = readInput(in, elemClass);
- add(itemClass.cast(row));
- }
- }
- }
- public void writeTo(DataOutputStream out) throws IOException {
- out.writeShort((short)size());
- for (T item : this) {
- writeOutput(out, item);
- }
- }
- }
-
- private static <T> T readInput(DataInputStream in, Class<T> dataClass) throws IOException {
- Object data;
- if (dataClass == Integer.class) {
- data = in.readInt();
- } else if (dataClass == Short.class) {
- data = in.readShort();
- } else if (dataClass == Byte.class) {
- data = in.readByte();
- } else if (dataClass == String.class) {
- data = in.readUTF();
- } else if (Chunk.class.isAssignableFrom(dataClass)) {
- T obj;
- try { obj = dataClass.newInstance(); }
- catch (Exception ex) { throw new RuntimeException(ex); }
- ((Chunk)obj).readFrom(in);
- data = obj;
- } else {
- throw new InternalError("bad input datum: "+dataClass);
- }
- return dataClass.cast(data);
- }
- private static <T> T readInput(byte[] bytes, Class<T> dataClass) {
- try {
- return readInput(new DataInputStream(new ByteArrayInputStream(bytes)), dataClass);
- } catch (IOException ex) {
- throw new InternalError();
- }
- }
- private static void readInputs(DataInputStream in, Object... data) throws IOException {
- for (Object x : data) ((Chunk)x).readFrom(in);
- }
-
- private static void writeOutput(DataOutputStream out, Object data) throws IOException {
- if (data == null) {
- return;
- } if (data instanceof Integer) {
- out.writeInt((Integer)data);
- } else if (data instanceof Long) {
- out.writeLong((Long)data);
- } else if (data instanceof Short) {
- out.writeShort((Short)data);
- } else if (data instanceof Byte) {
- out.writeByte((Byte)data);
- } else if (data instanceof String) {
- out.writeUTF((String)data);
- } else if (data instanceof byte[]) {
- out.write((byte[])data);
- } else if (data instanceof Object[]) {
- for (Object x : (Object[]) data)
- writeOutput(out, x);
- } else if (data instanceof Chunk) {
- Chunk x = (Chunk) data;
- x.writeTo(out);
- } else if (data instanceof List) {
- for (Object x : (List<?>) data)
- writeOutput(out, x);
- } else {
- throw new InternalError("bad output datum: "+data+" : "+data.getClass().getName());
- }
- }
- private static void writeOutputs(DataOutputStream out, Object... data) throws IOException {
- for (Object x : data) writeOutput(out, x);
- }
-
- public static abstract class Outer {
- public abstract List<? extends Inner> inners();
- protected void linkInners() {
- for (Inner i : inners()) {
- i.linkOuter(this);
- if (i instanceof Outer)
- ((Outer)i).linkInners();
- }
- }
- public <T extends Outer> T outer(Class<T> c) {
- for (Outer walk = this;; walk = ((Inner)walk).outer()) {
- if (c.isInstance(walk))
- return c.cast(walk);
- //if (!(walk instanceof Inner)) return null;
- }
- }
-
- public abstract List<Attr> attrs();
- public Attr findAttr(String name) {
- return findAttr(outer(ClassFile.class).pool.stringIndex(name, false));
- }
- public Attr findAttr(int name) {
- if (name == 0) return null;
- for (Attr a : attrs()) {
- if (a.name == name) return a;
- }
- return null;
- }
- }
- public interface Inner { Outer outer(); void linkOuter(Outer o); }
- public static abstract class InnerOuter extends Outer implements Inner {
- public Outer outer;
- public Outer outer() { return outer; }
- public void linkOuter(Outer o) { assert(outer == null); outer = o; }
- }
- public static class Constant<T> implements Chunk {
- public final byte tag;
- public final T item;
- public final int index;
- public Constant(int index, byte tag, T item) {
- this.index = index;
- this.tag = tag;
- this.item = item;
- }
- public Constant checkTag(byte tag) {
- if (this.tag != tag) throw new InternalError(this.toString());
- return this;
- }
- public String itemString() { return (String)item; }
- public Short itemIndex() { return (Short)item; }
- public Short[] itemIndexes() { return (Short[])item; }
- public void readFrom(DataInputStream in) throws IOException {
- throw new InternalError("do not call");
- }
- public void writeTo(DataOutputStream out) throws IOException {
- writeOutputs(out, tag, item);
- }
- public boolean equals(Object x) { return (x instanceof Constant && equals((Constant)x)); }
- public boolean equals(Constant that) {
- return (this.tag == that.tag && this.itemAsComparable().equals(that.itemAsComparable()));
- }
- public int hashCode() { return (tag * 31) + this.itemAsComparable().hashCode(); }
- public Object itemAsComparable() {
- switch (tag) {
- case CONSTANT_Double: return Double.longBitsToDouble((Long)item);
- case CONSTANT_Float: return Float.intBitsToFloat((Integer)item);
- }
- return (item instanceof Object[] ? Arrays.asList((Object[])item) : item);
- }
- public String toString() {
- String itstr = String.valueOf(itemAsComparable());
- return (index + ":" + tagName(tag) + (itstr.startsWith("[")?"":"=") + itstr);
- }
- private static String[] TAG_NAMES;
- public static String tagName(byte tag) { // used for error messages
- if (TAG_NAMES == null)
- TAG_NAMES = ("None Utf8 Unicode Integer Float Long Double Class String"
- +" Fieldref Methodref InterfaceMethodref NameAndType #13 #14"
- +" MethodHandle MethodType InvokeDynamic#17 InvokeDynamic").split(" ");
- if ((tag & 0xFF) >= TAG_NAMES.length) return "#"+(tag & 0xFF);
- return TAG_NAMES[tag & 0xFF];
- }
- }
-
- public static class Pool extends CountedList<Constant> implements Chunk {
- private Map<String,Short> strings = new TreeMap<>();
-
- public Pool() {
- super(Constant.class);
- }
- public void readFrom(DataInputStream in) throws IOException {
- int count = in.readUnsignedShort();
- add(null); // always ignore first item
- while (size() < count) {
- readConstant(in);
- }
- }
- public <T> Constant<T> addConstant(byte tag, T item) {
- Constant<T> con = new Constant<>(size(), tag, item);
- int idx = indexOf(con);
- if (idx >= 0) return get(idx);
- add(con);
- if (tag == CONSTANT_Utf8) strings.put((String)item, (short) con.index);
- return con;
- }
- private void readConstant(DataInputStream in) throws IOException {
- byte tag = in.readByte();
- int index = size();
- Object arg;
- switch (tag) {
- case CONSTANT_Utf8:
- arg = in.readUTF();
- strings.put((String) arg, (short) size());
- break;
- case CONSTANT_Integer:
- case CONSTANT_Float:
- arg = in.readInt(); break;
- case CONSTANT_Long:
- case CONSTANT_Double:
- add(new Constant(index, tag, in.readLong()));
- add(null);
- return;
- case CONSTANT_Class:
- case CONSTANT_String:
- arg = in.readShort(); break;
- case CONSTANT_Field:
- case CONSTANT_Method:
- case CONSTANT_InterfaceMethod:
- case CONSTANT_NameAndType:
- case CONSTANT_InvokeDynamic_17:
- case CONSTANT_InvokeDynamic:
- // read an ordered pair
- arg = new Short[] { in.readShort(), in.readShort() };
- break;
- case CONSTANT_MethodHandle:
- // read an ordered pair; first part is a u1 (not u2)
- arg = new Object[] { in.readByte(), in.readShort() };
- break;
- case CONSTANT_MethodType:
- arg = in.readShort(); break;
- default:
- throw new InternalError("bad CP tag "+tag);
- }
- add(new Constant(index, tag, arg));
- }
-
- // Access:
- public Constant get(int index) {
- // extra 1-bits get into the shorts
- return super.get((char) index);
- }
- String getString(byte tag, short index) {
- get(index).checkTag(tag);
- return getString(index);
- }
- String getString(short index) {
- Object v = get(index).item;
- if (v instanceof Short)
- v = get((Short)v).checkTag(CONSTANT_Utf8).item;
- return (String) v;
- }
- String[] getStrings(Short[] indexes) {
- String[] res = new String[indexes.length];
- for (int i = 0; i < indexes.length; i++)
- res[i] = getString(indexes[i]);
- return res;
- }
- int stringIndex(String name, boolean createIfNotFound) {
- Short x = strings.get(name);
- if (x != null) return (char)(int) x;
- if (!createIfNotFound) return 0;
- return addConstant(CONSTANT_Utf8, name).index;
- }
- Short[] getMemberRef(short index) {
- Short[] cls_nnt = get(index).itemIndexes();
- Short[] name_type = get(cls_nnt[1]).itemIndexes();
- return new Short[]{ cls_nnt[0], name_type[0], name_type[1] };
- }
- }
-
- public class ClassFile extends Outer implements Chunk {
- ClassFile(File f) throws IOException {
- DataInputStream in = openInput(f);
- try {
- readFrom(in);
- } finally {
- if (in != null) in.close();
- }
- }
-
- public int magic, version; // <min:maj>
- public final Pool pool = new Pool();
- public short access, thisc, superc;
- public final List<Short> interfaces = new CountedList<>(Short.class);
- public final List<Field> fields = new CountedList<>(Field.class);
- public final List<Method> methods = new CountedList<>(Method.class);
- public final List<Attr> attrs = new CountedList<>(Attr.class);
-
- public final void readFrom(DataInputStream in) throws IOException {
- magic = in.readInt(); version = in.readInt();
- if (magic != 0xCAFEBABE) throw new IOException("bad magic number");
- pool.readFrom(in);
- Code_index = pool.stringIndex("Code", false);
- access = in.readShort(); thisc = in.readShort(); superc = in.readShort();
- readInputs(in, interfaces, fields, methods, attrs);
- if (in.read() >= 0) throw new IOException("junk after end of file");
- linkInners();
- }
-
- void writeTo(File f) throws IOException {
- DataOutputStream out = openOutput(f);
- try {
- writeTo(out);
- } finally {
- out.close();
- }
- }
-
- public void writeTo(DataOutputStream out) throws IOException {
- writeOutputs(out, magic, version, pool,
- access, thisc, superc, interfaces,
- fields, methods, attrs);
- }
-
- public byte[] toByteArray() {
- try {
- ByteArrayOutputStream buf = new ByteArrayOutputStream();
- writeTo(new DataOutputStream(buf));
- return buf.toByteArray();
- } catch (IOException ex) {
- throw new InternalError();
- }
- }
-
- public List<Inner> inners() {
- List<Inner> inns = new ArrayList<>();
- inns.addAll(fields); inns.addAll(methods); inns.addAll(attrs);
- return inns;
- }
- public List<Attr> attrs() { return attrs; }
-
- // derived stuff:
- public String nameString() { return pool.getString(CONSTANT_Class, thisc); }
- int Code_index;
- }
-
- private static <T extends Member> T findMember(List<T> mems, int name, int type) {
- if (name == 0 || type == 0) return null;
- for (T m : mems) {
- if (m.name == name && m.type == type) return m;
- }
- return null;
- }
-
- public static class Member extends InnerOuter implements Chunk {
- public short access, name, type;
- public final List<Attr> attrs = new CountedList<>(Attr.class);
- public void readFrom(DataInputStream in) throws IOException {
- access = in.readShort(); name = in.readShort(); type = in.readShort();
- readInputs(in, attrs);
- }
- public void writeTo(DataOutputStream out) throws IOException {
- writeOutputs(out, access, name, type, attrs);
- }
- public List<Attr> inners() { return attrs; }
- public List<Attr> attrs() { return attrs; }
- public ClassFile outer() { return (ClassFile) outer; }
- public String nameString() { return outer().pool.getString(CONSTANT_Utf8, name); }
- public String typeString() { return outer().pool.getString(CONSTANT_Utf8, type); }
- public String toString() {
- if (outer == null) return super.toString();
- return nameString() + (this instanceof Method ? "" : ":")
- + simplifyType(typeString());
- }
- }
- public static class Field extends Member {
- }
- public static class Method extends Member {
- public Code code() {
- Attr a = findAttr("Code");
- if (a == null) return null;
- return (Code) a.item;
- }
- public Instruction instructions() {
- Code code = code();
- if (code == null) return null;
- return code.instructions();
- }
- }
-
- public static class Attr extends InnerOuter implements Chunk {
- public short name;
- public int size = -1; // no pre-declared size
- public Object item;
-
- public Attr() {}
- public Attr(Outer outer, String name, Object item) {
- ClassFile cf = outer.outer(ClassFile.class);
- linkOuter(outer);
- this.name = (short) cf.pool.stringIndex(name, true);
- this.item = item;
- outer.attrs().add(this);
- }
- public void readFrom(DataInputStream in) throws IOException {
- name = in.readShort();
- size = in.readInt();
- item = readRawBytes(in, size);
- }
- public void writeTo(DataOutputStream out) throws IOException {
- out.writeShort(name);
- // write the 4-byte size header and then the contents:
- byte[] bytes;
- int trueSize;
- if (item instanceof byte[]) {
- bytes = (byte[]) item;
- out.writeInt(trueSize = bytes.length);
- out.write(bytes);
- } else {
- trueSize = flatten(out);
- //if (!(item instanceof Code)) System.err.println("wrote complex attr name="+(int)(char)name+" size="+trueSize+" data="+Arrays.toString(flatten()));
- }
- if (trueSize != size && size >= 0)
- System.err.println("warning: attribute size changed "+size+" to "+trueSize);
- }
- public void linkOuter(Outer o) {
- super.linkOuter(o);
- if (item instanceof byte[] &&
- outer instanceof Method &&
- ((Method)outer).outer().Code_index == name) {
- item = readInput((byte[])item, Code.class);
- }
- }
- public List<Inner> inners() {
- if (item instanceof Inner)
- return Collections.nCopies(1, (Inner)item);
- return Collections.emptyList();
- }
- public List<Attr> attrs() { return null; } // Code overrides this
- public byte[] flatten() {
- ByteArrayOutputStream buf = new ByteArrayOutputStream(Math.max(20, size));
- flatten(buf);
- return buf.toByteArray();
- }
- public int flatten(DataOutputStream out) throws IOException {
- ByteArrayOutputStream buf = new ByteArrayOutputStream(Math.max(20, size));
- int trueSize = flatten(buf);
- out.writeInt(trueSize);
- buf.writeTo(out);
- return trueSize;
- }
- private int flatten(ByteArrayOutputStream buf) {
- try {
- writeOutput(new DataOutputStream(buf), item);
- return buf.size();
- } catch (IOException ex) {
- throw new InternalError();
- }
- }
- public String nameString() {
- ClassFile cf = outer(ClassFile.class);
- if (cf == null) return "#"+name;
- return cf.pool.getString(name);
- }
- public String toString() {
- return nameString()+(size < 0 ? "=" : "["+size+"]=")+item;
- }
- }
-
- public static class Code extends InnerOuter implements Chunk {
- public short stacks, locals;
- public byte[] bytes;
- public final List<Short[]> etable = new CountedList<>(Short[].class, 4);
- public final List<Attr> attrs = new CountedList<>(Attr.class);
- // etable[N] = (N)*{ startpc, endpc, handlerpc, catchtype }
- public void readFrom(DataInputStream in) throws IOException {
- stacks = in.readShort(); locals = in.readShort();
- bytes = readRawBytes(in, in.readInt());
- readInputs(in, etable, attrs);
- }
- public void writeTo(DataOutputStream out) throws IOException {
- writeOutputs(out, stacks, locals, bytes.length, bytes, etable, attrs);
- }
- public List<Attr> inners() { return attrs; }
- public List<Attr> attrs() { return attrs; }
- public Instruction instructions() {
- return new Instruction(bytes, 0);
- }
- }
-
- // lots of constants
- private static final byte
- CONSTANT_Utf8 = 1,
- CONSTANT_Integer = 3,
- CONSTANT_Float = 4,
- CONSTANT_Long = 5,
- CONSTANT_Double = 6,
- CONSTANT_Class = 7,
- CONSTANT_String = 8,
- CONSTANT_Field = 9,
- CONSTANT_Method = 10,
- CONSTANT_InterfaceMethod = 11,
- CONSTANT_NameAndType = 12,
- CONSTANT_MethodHandle = 15, // JSR 292
- CONSTANT_MethodType = 16, // JSR 292
- CONSTANT_InvokeDynamic_17 = 17, // JSR 292, only occurs in old class files
- CONSTANT_InvokeDynamic = 18; // JSR 292
- private static final byte
- REF_getField = 1,
- REF_getStatic = 2,
- REF_putField = 3,
- REF_putStatic = 4,
- REF_invokeVirtual = 5,
- REF_invokeStatic = 6,
- REF_invokeSpecial = 7,
- REF_newInvokeSpecial = 8,
- REF_invokeInterface = 9;
-
- private static final int
- opc_nop = 0,
- opc_aconst_null = 1,
- opc_nconst_MIN = 2, // iconst_m1
- opc_nconst_MAX = 15, // dconst_1
- opc_bipush = 16,
- opc_sipush = 17,
- opc_ldc = 18,
- opc_ldc_w = 19,
- opc_ldc2_w = 20,
- opc_aload = 25,
- opc_aload_0 = 42,
- opc_aload_MAX = 45,
- opc_aaload = 50,
- opc_astore = 58,
- opc_astore_0 = 75,
- opc_astore_MAX = 78,
- opc_aastore = 83,
- opc_pop = 87,
- opc_pop2 = 88,
- opc_dup = 89,
- opc_dup_x1 = 90,
- opc_dup_x2 = 91,
- opc_dup2 = 92,
- opc_dup2_x1 = 93,
- opc_dup2_x2 = 94,
- opc_swap = 95,
- opc_tableswitch = 170,
- opc_lookupswitch = 171,
- opc_areturn = 176,
- opc_getstatic = 178,
- opc_putstatic = 179,
- opc_getfield = 180,
- opc_putfield = 181,
- opc_invokevirtual = 182,
- opc_invokespecial = 183,
- opc_invokestatic = 184,
- opc_invokeinterface = 185,
- opc_invokedynamic = 186,
- opc_new = 187,
- opc_anewarray = 189,
- opc_checkcast = 192,
- opc_ifnull = 198,
- opc_ifnonnull = 199,
- opc_wide = 196;
-
- private static final Object[] INSTRUCTION_CONSTANTS = {
- -1, 0, 1, 2, 3, 4, 5, 0L, 1L, 0.0F, 1.0F, 2.0F, 0.0D, 1.0D
- };
-
- private static final String INSTRUCTION_FORMATS =
- "nop$ aconst_null$L iconst_m1$I iconst_0$I iconst_1$I "+
- "iconst_2$I iconst_3$I iconst_4$I iconst_5$I lconst_0$J_ "+
- "lconst_1$J_ fconst_0$F fconst_1$F fconst_2$F dconst_0$D_ "+
- "dconst_1$D_ bipush=bx$I sipush=bxx$I ldc=bk$X ldc_w=bkk$X "+
- "ldc2_w=bkk$X_ iload=bl/wbll$I lload=bl/wbll$J_ fload=bl/wbll$F "+
- "dload=bl/wbll$D_ aload=bl/wbll$L iload_0$I iload_1$I "+
- "iload_2$I iload_3$I lload_0$J_ lload_1$J_ lload_2$J_ "+
- "lload_3$J_ fload_0$F fload_1$F fload_2$F fload_3$F dload_0$D_ "+
- "dload_1$D_ dload_2$D_ dload_3$D_ aload_0$L aload_1$L "+
- "aload_2$L aload_3$L iaload$LI$I laload$LI$J_ faload$LI$F "+
- "daload$LI$D_ aaload$LI$L baload$LI$I caload$LI$I saload$LI$I "+
- "istore=bl/wbll$I$ lstore=bl/wbll$J_$ fstore=bl/wbll$F$ "+
- "dstore=bl/wbll$D_$ astore=bl/wbll$L$ istore_0$I$ istore_1$I$ "+
- "istore_2$I$ istore_3$I$ lstore_0$J_$ lstore_1$J_$ "+
- "lstore_2$J_$ lstore_3$J_$ fstore_0$F$ fstore_1$F$ fstore_2$F$ "+
- "fstore_3$F$ dstore_0$D_$ dstore_1$D_$ dstore_2$D_$ "+
- "dstore_3$D_$ astore_0$L$ astore_1$L$ astore_2$L$ astore_3$L$ "+
- "iastore$LII$ lastore$LIJ_$ fastore$LIF$ dastore$LID_$ "+
- "aastore$LIL$ bastore$LII$ castore$LII$ sastore$LII$ pop$X$ "+
- "pop2$XX$ dup$X$XX dup_x1$XX$XXX dup_x2$XXX$XXXX dup2$XX$XXXX "+
- "dup2_x1$XXX$XXXXX dup2_x2$XXXX$XXXXXX swap$XX$XX "+
- "iadd$II$I ladd$J_J_$J_ fadd$FF$F dadd$D_D_$D_ isub$II$I "+
- "lsub$J_J_$J_ fsub$FF$F dsub$D_D_$D_ imul$II$I lmul$J_J_$J_ "+
- "fmul$FF$F dmul$D_D_$D_ idiv$II$I ldiv$J_J_$J_ fdiv$FF$F "+
- "ddiv$D_D_$D_ irem$II$I lrem$J_J_$J_ frem$FF$F drem$D_D_$D_ "+
- "ineg$I$I lneg$J_$J_ fneg$F$F dneg$D_$D_ ishl$II$I lshl$J_I$J_ "+
- "ishr$II$I lshr$J_I$J_ iushr$II$I lushr$J_I$J_ iand$II$I "+
- "land$J_J_$J_ ior$II$I lor$J_J_$J_ ixor$II$I lxor$J_J_$J_ "+
- "iinc=blx/wbllxx$ i2l$I$J_ i2f$I$F i2d$I$D_ l2i$J_$I l2f$J_$F "+
- "l2d$J_$D_ f2i$F$I f2l$F$J_ f2d$F$D_ d2i$D_$I d2l$D_$J_ "+
- "d2f$D_$F i2b$I$I i2c$I$I i2s$I$I lcmp fcmpl fcmpg dcmpl dcmpg "+
- "ifeq=boo ifne=boo iflt=boo ifge=boo ifgt=boo ifle=boo "+
- "if_icmpeq=boo if_icmpne=boo if_icmplt=boo if_icmpge=boo "+
- "if_icmpgt=boo if_icmple=boo if_acmpeq=boo if_acmpne=boo "+
- "goto=boo jsr=boo ret=bl/wbll tableswitch=* lookupswitch=* "+
- "ireturn lreturn freturn dreturn areturn return "+
- "getstatic=bkf$Q putstatic=bkf$Q$ getfield=bkf$L$Q "+
- "putfield=bkf$LQ$ invokevirtual=bkm$LQ$Q "+
- "invokespecial=bkm$LQ$Q invokestatic=bkm$Q$Q "+
- "invokeinterface=bkixx$LQ$Q invokedynamic=bkd__$Q$Q new=bkc$L "+
- "newarray=bx$I$L anewarray=bkc$I$L arraylength$L$I athrow "+
- "checkcast=bkc$L$L instanceof=bkc$L$I monitorenter$L "+
- "monitorexit$L wide=* multianewarray=bkcx ifnull=boo "+
- "ifnonnull=boo goto_w=boooo jsr_w=boooo ";
- private static final String[] INSTRUCTION_NAMES;
- private static final String[] INSTRUCTION_POPS;
- private static final int[] INSTRUCTION_INFO;
- static {
- String[] insns = INSTRUCTION_FORMATS.split(" ");
- assert(insns[opc_lookupswitch].startsWith("lookupswitch"));
- assert(insns[opc_tableswitch].startsWith("tableswitch"));
- assert(insns[opc_wide].startsWith("wide"));
- assert(insns[opc_invokedynamic].startsWith("invokedynamic"));
- int[] info = new int[256];
- String[] names = new String[256];
- String[] pops = new String[256];
- for (int i = 0; i < insns.length; i++) {
- String insn = insns[i];
- int dl = insn.indexOf('$');
- if (dl > 0) {
- String p = insn.substring(dl+1);
- if (p.indexOf('$') < 0) p = "$" + p;
- pops[i] = p;
- insn = insn.substring(0, dl);
- }
- int eq = insn.indexOf('=');
- if (eq < 0) {
- info[i] = 1;
- names[i] = insn;
- continue;
- }
- names[i] = insn.substring(0, eq);
- String fmt = insn.substring(eq+1);
- if (fmt.equals("*")) {
- info[i] = 0;
- continue;
- }
- int sl = fmt.indexOf('/');
- if (sl < 0) {
- info[i] = (char) fmt.length();
- } else {
- String wfmt = fmt.substring(sl+1);
- fmt = fmt.substring(0, sl);
- info[i] = (char)( fmt.length() + (wfmt.length() * 16) );
- }
- }
- INSTRUCTION_INFO = info;
- INSTRUCTION_NAMES = names;
- INSTRUCTION_POPS = pops;
- }
-
- public static class Instruction implements Cloneable {
- byte[] codeBase;
- int pc;
- int bc;
- int info;
- int wide;
- int len;
- Instruction(byte[] codeBase, int pc) {
- this.codeBase = codeBase;
- init(pc);
- }
- public Instruction clone() {
- try {
- return (Instruction) super.clone();
- } catch (CloneNotSupportedException ex) {
- throw new InternalError();
- }
- }
- private Instruction init(int pc) {
- this.pc = pc;
- this.bc = codeBase[pc] & 0xFF;
- this.info = INSTRUCTION_INFO[bc];
- this.wide = 0;
- this.len = (info & 0x0F);
- if (len == 0)
- computeLength();
- return this;
- }
- Instruction next() {
- if (len == 0 && bc != 0) throw new InternalError();
- int npc = pc + len;
- if (npc == codeBase.length)
- return null;
- return init(npc);
- }
- void forceNext(int newLen) {
- bc = opc_nop;
- len = newLen;
- }
-
- public String toString() {
- StringBuilder buf = new StringBuilder();
- buf.append(pc).append(":").append(INSTRUCTION_NAMES[bc]);
- switch (len) {
- case 3: buf.append(" ").append(u2At(1)); break;
- case 5: buf.append(" ").append(u2At(1)).append(" ").append(u2At(3)); break;
- default: for (int i = 1; i < len; i++) buf.append(" ").append(u1At(1));
- }
- return buf.toString();
- }
-
- // these are the hard parts
- private void computeLength() {
- int cases;
- switch (bc) {
- case opc_wide:
- bc = codeBase[pc + 1];
- info = INSTRUCTION_INFO[bc];
- len = ((info >> 4) & 0x0F);
- if (len == 0) throw new RuntimeException("misplaced wide bytecode: "+bc);
- return;
-
- case opc_tableswitch:
- cases = (u4At(alignedIntOffset(2)) - u4At(alignedIntOffset(1)) + 1);
- len = alignedIntOffset(3 + cases*1);
- return;
-
- case opc_lookupswitch:
- cases = u4At(alignedIntOffset(1));
- len = alignedIntOffset(2 + cases*2);
- return;
-
- default:
- throw new RuntimeException("unknown bytecode: "+bc);
- }
- }
- // switch code
- // clget the Nth int (where 0 is the first after the opcode itself)
- public int alignedIntOffset(int n) {
- int pos = pc + 1;
- pos += ((-pos) & 0x03); // align it
- pos += (n * 4);
- return pos - pc;
- }
- public int u1At(int pos) {
- return (codeBase[pc+pos] & 0xFF);
- }
- public int u2At(int pos) {
- return (u1At(pos+0)<<8) + u1At(pos+1);
- }
- public int u4At(int pos) {
- return (u2At(pos+0)<<16) + u2At(pos+2);
- }
- public void u1AtPut(int pos, int x) {
- codeBase[pc+pos] = (byte)x;
- }
- public void u2AtPut(int pos, int x) {
- codeBase[pc+pos+0] = (byte)(x >> 8);
- codeBase[pc+pos+1] = (byte)(x >> 0);
- }
- }
-
- static String simplifyType(String type) {
- String simpleType = OBJ_SIGNATURE.matcher(type).replaceAll("L");
- assert(simpleType.matches("^\\([A-Z]*\\)[A-Z]$"));
- // change (DD)D to (D_D_)D_
- simpleType = WIDE_SIGNATURE.matcher(simpleType).replaceAll("\\0_");
- return simpleType;
- }
- static int argsize(String type) {
- return simplifyType(type).length()-3;
- }
- private static final Pattern OBJ_SIGNATURE = Pattern.compile("\\[*L[^;]*;|\\[+[A-Z]");
- private static final Pattern WIDE_SIGNATURE = Pattern.compile("[JD]");
-}