jaroslav@1646: /*
jaroslav@1646:  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
jaroslav@1646:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jaroslav@1646:  *
jaroslav@1646:  * This code is free software; you can redistribute it and/or modify it
jaroslav@1646:  * under the terms of the GNU General Public License version 2 only, as
jaroslav@1646:  * published by the Free Software Foundation.  Oracle designates this
jaroslav@1646:  * particular file as subject to the "Classpath" exception as provided
jaroslav@1646:  * by Oracle in the LICENSE file that accompanied this code.
jaroslav@1646:  *
jaroslav@1646:  * This code is distributed in the hope that it will be useful, but WITHOUT
jaroslav@1646:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jaroslav@1646:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jaroslav@1646:  * version 2 for more details (a copy is included in the LICENSE file that
jaroslav@1646:  * accompanied this code).
jaroslav@1646:  *
jaroslav@1646:  * You should have received a copy of the GNU General Public License version
jaroslav@1646:  * 2 along with this work; if not, write to the Free Software Foundation,
jaroslav@1646:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jaroslav@1646:  *
jaroslav@1646:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
jaroslav@1646:  * or visit www.oracle.com if you need additional information or have any
jaroslav@1646:  * questions.
jaroslav@1646:  */
jaroslav@1646: 
jaroslav@1646: package java.lang.invoke;
jaroslav@1646: 
jaroslav@1646: import sun.invoke.util.VerifyAccess;
jaroslav@1646: import java.lang.invoke.LambdaForm.Name;
jaroslav@1646: import java.lang.invoke.MethodHandles.Lookup;
jaroslav@1646: 
jaroslav@1646: import sun.invoke.util.Wrapper;
jaroslav@1646: 
jaroslav@1646: import java.io.*;
jaroslav@1646: import java.util.*;
jaroslav@1646: 
jaroslav@1646: import jdk.internal.org.objectweb.asm.*;
jaroslav@1646: 
jaroslav@1646: import java.lang.reflect.*;
jaroslav@1646: import static java.lang.invoke.MethodHandleStatics.*;
jaroslav@1646: import static java.lang.invoke.MethodHandleNatives.Constants.*;
jaroslav@1646: import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP;
jaroslav@1646: import sun.invoke.util.ValueConversions;
jaroslav@1646: import sun.invoke.util.VerifyType;
jaroslav@1646: 
jaroslav@1646: /**
jaroslav@1646:  * Code generation backend for LambdaForm.
jaroslav@1646:  * <p>
jaroslav@1646:  * @author John Rose, JSR 292 EG
jaroslav@1646:  */
jaroslav@1646: class InvokerBytecodeGenerator {
jaroslav@1646:     /** Define class names for convenience. */
jaroslav@1646:     private static final String MH      = "java/lang/invoke/MethodHandle";
jaroslav@1646:     private static final String BMH     = "java/lang/invoke/BoundMethodHandle";
jaroslav@1646:     private static final String LF      = "java/lang/invoke/LambdaForm";
jaroslav@1646:     private static final String LFN     = "java/lang/invoke/LambdaForm$Name";
jaroslav@1646:     private static final String CLS     = "java/lang/Class";
jaroslav@1646:     private static final String OBJ     = "java/lang/Object";
jaroslav@1646:     private static final String OBJARY  = "[Ljava/lang/Object;";
jaroslav@1646: 
jaroslav@1646:     private static final String LF_SIG  = "L" + LF + ";";
jaroslav@1646:     private static final String LFN_SIG = "L" + LFN + ";";
jaroslav@1646:     private static final String LL_SIG  = "(L" + OBJ + ";)L" + OBJ + ";";
jaroslav@1646: 
jaroslav@1646:     /** Name of its super class*/
jaroslav@1646:     private static final String superName = LF;
jaroslav@1646: 
jaroslav@1646:     /** Name of new class */
jaroslav@1646:     private final String className;
jaroslav@1646: 
jaroslav@1646:     /** Name of the source file (for stack trace printing). */
jaroslav@1646:     private final String sourceFile;
jaroslav@1646: 
jaroslav@1646:     private final LambdaForm lambdaForm;
jaroslav@1646:     private final String     invokerName;
jaroslav@1646:     private final MethodType invokerType;
jaroslav@1646:     private final int[] localsMap;
jaroslav@1646: 
jaroslav@1646:     /** ASM bytecode generation. */
jaroslav@1646:     private ClassWriter cw;
jaroslav@1646:     private MethodVisitor mv;
jaroslav@1646: 
jaroslav@1646:     private static final MemberName.Factory MEMBERNAME_FACTORY = MemberName.getFactory();
jaroslav@1646:     private static final Class<?> HOST_CLASS = LambdaForm.class;
jaroslav@1646: 
jaroslav@1646:     private InvokerBytecodeGenerator(LambdaForm lambdaForm, int localsMapSize,
jaroslav@1646:                                      String className, String invokerName, MethodType invokerType) {
jaroslav@1646:         if (invokerName.contains(".")) {
jaroslav@1646:             int p = invokerName.indexOf(".");
jaroslav@1646:             className = invokerName.substring(0, p);
jaroslav@1646:             invokerName = invokerName.substring(p+1);
jaroslav@1646:         }
jaroslav@1646:         if (DUMP_CLASS_FILES) {
jaroslav@1646:             className = makeDumpableClassName(className);
jaroslav@1646:         }
jaroslav@1646:         this.className  = superName + "$" + className;
jaroslav@1646:         this.sourceFile = "LambdaForm$" + className;
jaroslav@1646:         this.lambdaForm = lambdaForm;
jaroslav@1646:         this.invokerName = invokerName;
jaroslav@1646:         this.invokerType = invokerType;
jaroslav@1646:         this.localsMap = new int[localsMapSize];
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private InvokerBytecodeGenerator(String className, String invokerName, MethodType invokerType) {
jaroslav@1646:         this(null, invokerType.parameterCount(),
jaroslav@1646:              className, invokerName, invokerType);
jaroslav@1646:         // Create an array to map name indexes to locals indexes.
jaroslav@1646:         for (int i = 0; i < localsMap.length; i++) {
jaroslav@1646:             localsMap[i] = invokerType.parameterSlotCount() - invokerType.parameterSlotDepth(i);
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private InvokerBytecodeGenerator(String className, LambdaForm form, MethodType invokerType) {
jaroslav@1646:         this(form, form.names.length,
jaroslav@1646:              className, form.debugName, invokerType);
jaroslav@1646:         // Create an array to map name indexes to locals indexes.
jaroslav@1646:         Name[] names = form.names;
jaroslav@1646:         for (int i = 0, index = 0; i < localsMap.length; i++) {
jaroslav@1646:             localsMap[i] = index;
jaroslav@1646:             index += Wrapper.forBasicType(names[i].type).stackSlots();
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646: 
jaroslav@1646:     /** instance counters for dumped classes */
jaroslav@1646:     private final static HashMap<String,Integer> DUMP_CLASS_FILES_COUNTERS;
jaroslav@1646:     /** debugging flag for saving generated class files */
jaroslav@1646:     private final static File DUMP_CLASS_FILES_DIR;
jaroslav@1646: 
jaroslav@1646:     static {
jaroslav@1646:         if (DUMP_CLASS_FILES) {
jaroslav@1646:             DUMP_CLASS_FILES_COUNTERS = new HashMap<>();
jaroslav@1646:             try {
jaroslav@1646:                 File dumpDir = new File("DUMP_CLASS_FILES");
jaroslav@1646:                 if (!dumpDir.exists()) {
jaroslav@1646:                     dumpDir.mkdirs();
jaroslav@1646:                 }
jaroslav@1646:                 DUMP_CLASS_FILES_DIR = dumpDir;
jaroslav@1646:                 System.out.println("Dumping class files to "+DUMP_CLASS_FILES_DIR+"/...");
jaroslav@1646:             } catch (Exception e) {
jaroslav@1646:                 throw newInternalError(e);
jaroslav@1646:             }
jaroslav@1646:         } else {
jaroslav@1646:             DUMP_CLASS_FILES_COUNTERS = null;
jaroslav@1646:             DUMP_CLASS_FILES_DIR = null;
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     static void maybeDump(final String className, final byte[] classFile) {
jaroslav@1646:         if (DUMP_CLASS_FILES) {
jaroslav@1646:             System.out.println("dump: " + className);
jaroslav@1646:             java.security.AccessController.doPrivileged(
jaroslav@1646:             new java.security.PrivilegedAction<Void>() {
jaroslav@1646:                 public Void run() {
jaroslav@1646:                     try {
jaroslav@1646:                         String dumpName = className;
jaroslav@1646:                         //dumpName = dumpName.replace('/', '-');
jaroslav@1646:                         File dumpFile = new File(DUMP_CLASS_FILES_DIR, dumpName+".class");
jaroslav@1646:                         dumpFile.getParentFile().mkdirs();
jaroslav@1646:                         FileOutputStream file = new FileOutputStream(dumpFile);
jaroslav@1646:                         file.write(classFile);
jaroslav@1646:                         file.close();
jaroslav@1646:                         return null;
jaroslav@1646:                     } catch (IOException ex) {
jaroslav@1646:                         throw newInternalError(ex);
jaroslav@1646:                     }
jaroslav@1646:                 }
jaroslav@1646:             });
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private static String makeDumpableClassName(String className) {
jaroslav@1646:         Integer ctr;
jaroslav@1646:         synchronized (DUMP_CLASS_FILES_COUNTERS) {
jaroslav@1646:             ctr = DUMP_CLASS_FILES_COUNTERS.get(className);
jaroslav@1646:             if (ctr == null)  ctr = 0;
jaroslav@1646:             DUMP_CLASS_FILES_COUNTERS.put(className, ctr+1);
jaroslav@1646:         }
jaroslav@1646:         String sfx = ctr.toString();
jaroslav@1646:         while (sfx.length() < 3)
jaroslav@1646:             sfx = "0"+sfx;
jaroslav@1646:         className += sfx;
jaroslav@1646:         return className;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     class CpPatch {
jaroslav@1646:         final int index;
jaroslav@1646:         final String placeholder;
jaroslav@1646:         final Object value;
jaroslav@1646:         CpPatch(int index, String placeholder, Object value) {
jaroslav@1646:             this.index = index;
jaroslav@1646:             this.placeholder = placeholder;
jaroslav@1646:             this.value = value;
jaroslav@1646:         }
jaroslav@1646:         public String toString() {
jaroslav@1646:             return "CpPatch/index="+index+",placeholder="+placeholder+",value="+value;
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     Map<Object, CpPatch> cpPatches = new HashMap<>();
jaroslav@1646: 
jaroslav@1646:     int cph = 0;  // for counting constant placeholders
jaroslav@1646: 
jaroslav@1646:     String constantPlaceholder(Object arg) {
jaroslav@1646:         String cpPlaceholder = "CONSTANT_PLACEHOLDER_" + cph++;
jaroslav@1646:         if (DUMP_CLASS_FILES) cpPlaceholder += " <<" + arg.toString() + ">>";  // debugging aid
jaroslav@1646:         if (cpPatches.containsKey(cpPlaceholder)) {
jaroslav@1646:             throw new InternalError("observed CP placeholder twice: " + cpPlaceholder);
jaroslav@1646:         }
jaroslav@1646:         // insert placeholder in CP and remember the patch
jaroslav@1646:         int index = cw.newConst((Object) cpPlaceholder);  // TODO check if aready in the constant pool
jaroslav@1646:         cpPatches.put(cpPlaceholder, new CpPatch(index, cpPlaceholder, arg));
jaroslav@1646:         return cpPlaceholder;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     Object[] cpPatches(byte[] classFile) {
jaroslav@1646:         int size = getConstantPoolSize(classFile);
jaroslav@1646:         Object[] res = new Object[size];
jaroslav@1646:         for (CpPatch p : cpPatches.values()) {
jaroslav@1646:             if (p.index >= size)
jaroslav@1646:                 throw new InternalError("in cpool["+size+"]: "+p+"\n"+Arrays.toString(Arrays.copyOf(classFile, 20)));
jaroslav@1646:             res[p.index] = p.value;
jaroslav@1646:         }
jaroslav@1646:         return res;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Extract the number of constant pool entries from a given class file.
jaroslav@1646:      *
jaroslav@1646:      * @param classFile the bytes of the class file in question.
jaroslav@1646:      * @return the number of entries in the constant pool.
jaroslav@1646:      */
jaroslav@1646:     private static int getConstantPoolSize(byte[] classFile) {
jaroslav@1646:         // The first few bytes:
jaroslav@1646:         // u4 magic;
jaroslav@1646:         // u2 minor_version;
jaroslav@1646:         // u2 major_version;
jaroslav@1646:         // u2 constant_pool_count;
jaroslav@1646:         return ((classFile[8] & 0xFF) << 8) | (classFile[9] & 0xFF);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Extract the MemberName of a newly-defined method.
jaroslav@1646:      */
jaroslav@1646:     private MemberName loadMethod(byte[] classFile) {
jaroslav@1646:         Class<?> invokerClass = loadAndInitializeInvokerClass(classFile, cpPatches(classFile));
jaroslav@1646:         return resolveInvokerMember(invokerClass, invokerName, invokerType);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Define a given class as anonymous class in the runtime system.
jaroslav@1646:      */
jaroslav@1646:     private static Class<?> loadAndInitializeInvokerClass(byte[] classBytes, Object[] patches) {
jaroslav@1646:         Class<?> invokerClass = UNSAFE.defineAnonymousClass(HOST_CLASS, classBytes, patches);
jaroslav@1646:         UNSAFE.ensureClassInitialized(invokerClass);  // Make sure the class is initialized; VM might complain.
jaroslav@1646:         return invokerClass;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private static MemberName resolveInvokerMember(Class<?> invokerClass, String name, MethodType type) {
jaroslav@1646:         MemberName member = new MemberName(invokerClass, name, type, REF_invokeStatic);
jaroslav@1646:         //System.out.println("resolveInvokerMember => "+member);
jaroslav@1646:         //for (Method m : invokerClass.getDeclaredMethods())  System.out.println("  "+m);
jaroslav@1646:         try {
jaroslav@1646:             member = MEMBERNAME_FACTORY.resolveOrFail(REF_invokeStatic, member, HOST_CLASS, ReflectiveOperationException.class);
jaroslav@1646:         } catch (ReflectiveOperationException e) {
jaroslav@1646:             throw newInternalError(e);
jaroslav@1646:         }
jaroslav@1646:         //System.out.println("resolveInvokerMember => "+member);
jaroslav@1646:         return member;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Set up class file generation.
jaroslav@1646:      */
jaroslav@1646:     private void classFilePrologue() {
jaroslav@1646:         cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
jaroslav@1646:         cw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER, className, null, superName, null);
jaroslav@1646:         cw.visitSource(sourceFile, null);
jaroslav@1646: 
jaroslav@1646:         String invokerDesc = invokerType.toMethodDescriptorString();
jaroslav@1646:         mv = cw.visitMethod(Opcodes.ACC_STATIC, invokerName, invokerDesc, null, null);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Tear down class file generation.
jaroslav@1646:      */
jaroslav@1646:     private void classFileEpilogue() {
jaroslav@1646:         mv.visitMaxs(0, 0);
jaroslav@1646:         mv.visitEnd();
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /*
jaroslav@1646:      * Low-level emit helpers.
jaroslav@1646:      */
jaroslav@1646:     private void emitConst(Object con) {
jaroslav@1646:         if (con == null) {
jaroslav@1646:             mv.visitInsn(Opcodes.ACONST_NULL);
jaroslav@1646:             return;
jaroslav@1646:         }
jaroslav@1646:         if (con instanceof Integer) {
jaroslav@1646:             emitIconstInsn((int) con);
jaroslav@1646:             return;
jaroslav@1646:         }
jaroslav@1646:         if (con instanceof Long) {
jaroslav@1646:             long x = (long) con;
jaroslav@1646:             if (x == (short) x) {
jaroslav@1646:                 emitIconstInsn((int) x);
jaroslav@1646:                 mv.visitInsn(Opcodes.I2L);
jaroslav@1646:                 return;
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646:         if (con instanceof Float) {
jaroslav@1646:             float x = (float) con;
jaroslav@1646:             if (x == (short) x) {
jaroslav@1646:                 emitIconstInsn((int) x);
jaroslav@1646:                 mv.visitInsn(Opcodes.I2F);
jaroslav@1646:                 return;
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646:         if (con instanceof Double) {
jaroslav@1646:             double x = (double) con;
jaroslav@1646:             if (x == (short) x) {
jaroslav@1646:                 emitIconstInsn((int) x);
jaroslav@1646:                 mv.visitInsn(Opcodes.I2D);
jaroslav@1646:                 return;
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646:         if (con instanceof Boolean) {
jaroslav@1646:             emitIconstInsn((boolean) con ? 1 : 0);
jaroslav@1646:             return;
jaroslav@1646:         }
jaroslav@1646:         // fall through:
jaroslav@1646:         mv.visitLdcInsn(con);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private void emitIconstInsn(int i) {
jaroslav@1646:         int opcode;
jaroslav@1646:         switch (i) {
jaroslav@1646:         case 0:  opcode = Opcodes.ICONST_0;  break;
jaroslav@1646:         case 1:  opcode = Opcodes.ICONST_1;  break;
jaroslav@1646:         case 2:  opcode = Opcodes.ICONST_2;  break;
jaroslav@1646:         case 3:  opcode = Opcodes.ICONST_3;  break;
jaroslav@1646:         case 4:  opcode = Opcodes.ICONST_4;  break;
jaroslav@1646:         case 5:  opcode = Opcodes.ICONST_5;  break;
jaroslav@1646:         default:
jaroslav@1646:             if (i == (byte) i) {
jaroslav@1646:                 mv.visitIntInsn(Opcodes.BIPUSH, i & 0xFF);
jaroslav@1646:             } else if (i == (short) i) {
jaroslav@1646:                 mv.visitIntInsn(Opcodes.SIPUSH, (char) i);
jaroslav@1646:             } else {
jaroslav@1646:                 mv.visitLdcInsn(i);
jaroslav@1646:             }
jaroslav@1646:             return;
jaroslav@1646:         }
jaroslav@1646:         mv.visitInsn(opcode);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /*
jaroslav@1646:      * NOTE: These load/store methods use the localsMap to find the correct index!
jaroslav@1646:      */
jaroslav@1646:     private void emitLoadInsn(char type, int index) {
jaroslav@1646:         int opcode;
jaroslav@1646:         switch (type) {
jaroslav@1646:         case 'I':  opcode = Opcodes.ILOAD;  break;
jaroslav@1646:         case 'J':  opcode = Opcodes.LLOAD;  break;
jaroslav@1646:         case 'F':  opcode = Opcodes.FLOAD;  break;
jaroslav@1646:         case 'D':  opcode = Opcodes.DLOAD;  break;
jaroslav@1646:         case 'L':  opcode = Opcodes.ALOAD;  break;
jaroslav@1646:         default:
jaroslav@1646:             throw new InternalError("unknown type: " + type);
jaroslav@1646:         }
jaroslav@1646:         mv.visitVarInsn(opcode, localsMap[index]);
jaroslav@1646:     }
jaroslav@1646:     private void emitAloadInsn(int index) {
jaroslav@1646:         emitLoadInsn('L', index);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private void emitStoreInsn(char type, int index) {
jaroslav@1646:         int opcode;
jaroslav@1646:         switch (type) {
jaroslav@1646:         case 'I':  opcode = Opcodes.ISTORE;  break;
jaroslav@1646:         case 'J':  opcode = Opcodes.LSTORE;  break;
jaroslav@1646:         case 'F':  opcode = Opcodes.FSTORE;  break;
jaroslav@1646:         case 'D':  opcode = Opcodes.DSTORE;  break;
jaroslav@1646:         case 'L':  opcode = Opcodes.ASTORE;  break;
jaroslav@1646:         default:
jaroslav@1646:             throw new InternalError("unknown type: " + type);
jaroslav@1646:         }
jaroslav@1646:         mv.visitVarInsn(opcode, localsMap[index]);
jaroslav@1646:     }
jaroslav@1646:     private void emitAstoreInsn(int index) {
jaroslav@1646:         emitStoreInsn('L', index);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Emit a boxing call.
jaroslav@1646:      *
jaroslav@1646:      * @param type primitive type class to box.
jaroslav@1646:      */
jaroslav@1646:     private void emitBoxing(Class<?> type) {
jaroslav@1646:         Wrapper wrapper = Wrapper.forPrimitiveType(type);
jaroslav@1646:         String owner = "java/lang/" + wrapper.wrapperType().getSimpleName();
jaroslav@1646:         String name  = "valueOf";
jaroslav@1646:         String desc  = "(" + wrapper.basicTypeChar() + ")L" + owner + ";";
jaroslav@1646:         mv.visitMethodInsn(Opcodes.INVOKESTATIC, owner, name, desc);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Emit an unboxing call (plus preceding checkcast).
jaroslav@1646:      *
jaroslav@1646:      * @param type wrapper type class to unbox.
jaroslav@1646:      */
jaroslav@1646:     private void emitUnboxing(Class<?> type) {
jaroslav@1646:         Wrapper wrapper = Wrapper.forWrapperType(type);
jaroslav@1646:         String owner = "java/lang/" + wrapper.wrapperType().getSimpleName();
jaroslav@1646:         String name  = wrapper.primitiveSimpleName() + "Value";
jaroslav@1646:         String desc  = "()" + wrapper.basicTypeChar();
jaroslav@1646:         mv.visitTypeInsn(Opcodes.CHECKCAST, owner);
jaroslav@1646:         mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, owner, name, desc);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Emit an implicit conversion.
jaroslav@1646:      *
jaroslav@1646:      * @param ptype type of value present on stack
jaroslav@1646:      * @param pclass type of value required on stack
jaroslav@1646:      */
jaroslav@1646:     private void emitImplicitConversion(char ptype, Class<?> pclass) {
jaroslav@1646:         switch (ptype) {
jaroslav@1646:         case 'L':
jaroslav@1646:             if (VerifyType.isNullConversion(Object.class, pclass))
jaroslav@1646:                 return;
jaroslav@1646:             if (isStaticallyNameable(pclass)) {
jaroslav@1646:                 mv.visitTypeInsn(Opcodes.CHECKCAST, getInternalName(pclass));
jaroslav@1646:             } else {
jaroslav@1646:                 mv.visitLdcInsn(constantPlaceholder(pclass));
jaroslav@1646:                 mv.visitTypeInsn(Opcodes.CHECKCAST, CLS);
jaroslav@1646:                 mv.visitInsn(Opcodes.SWAP);
jaroslav@1646:                 mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, CLS, "cast", LL_SIG);
jaroslav@1646:                 if (pclass.isArray())
jaroslav@1646:                     mv.visitTypeInsn(Opcodes.CHECKCAST, OBJARY);
jaroslav@1646:             }
jaroslav@1646:             return;
jaroslav@1646:         case 'I':
jaroslav@1646:             if (!VerifyType.isNullConversion(int.class, pclass))
jaroslav@1646:                 emitPrimCast(ptype, Wrapper.basicTypeChar(pclass));
jaroslav@1646:             return;
jaroslav@1646:         case 'J':
jaroslav@1646:             assert(pclass == long.class);
jaroslav@1646:             return;
jaroslav@1646:         case 'F':
jaroslav@1646:             assert(pclass == float.class);
jaroslav@1646:             return;
jaroslav@1646:         case 'D':
jaroslav@1646:             assert(pclass == double.class);
jaroslav@1646:             return;
jaroslav@1646:         }
jaroslav@1646:         throw new InternalError("bad implicit conversion: tc="+ptype+": "+pclass);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Emits an actual return instruction conforming to the given return type.
jaroslav@1646:      */
jaroslav@1646:     private void emitReturnInsn(Class<?> type) {
jaroslav@1646:         int opcode;
jaroslav@1646:         switch (Wrapper.basicTypeChar(type)) {
jaroslav@1646:         case 'I':  opcode = Opcodes.IRETURN;  break;
jaroslav@1646:         case 'J':  opcode = Opcodes.LRETURN;  break;
jaroslav@1646:         case 'F':  opcode = Opcodes.FRETURN;  break;
jaroslav@1646:         case 'D':  opcode = Opcodes.DRETURN;  break;
jaroslav@1646:         case 'L':  opcode = Opcodes.ARETURN;  break;
jaroslav@1646:         case 'V':  opcode = Opcodes.RETURN;   break;
jaroslav@1646:         default:
jaroslav@1646:             throw new InternalError("unknown return type: " + type);
jaroslav@1646:         }
jaroslav@1646:         mv.visitInsn(opcode);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private static String getInternalName(Class<?> c) {
jaroslav@1646:         assert(VerifyAccess.isTypeVisible(c, Object.class));
jaroslav@1646:         return c.getName().replace('.', '/');
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Generate customized bytecode for a given LambdaForm.
jaroslav@1646:      */
jaroslav@1646:     static MemberName generateCustomizedCode(LambdaForm form, MethodType invokerType) {
jaroslav@1646:         InvokerBytecodeGenerator g = new InvokerBytecodeGenerator("MH", form, invokerType);
jaroslav@1646:         return g.loadMethod(g.generateCustomizedCodeBytes());
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Generate an invoker method for the passed {@link LambdaForm}.
jaroslav@1646:      */
jaroslav@1646:     private byte[] generateCustomizedCodeBytes() {
jaroslav@1646:         classFilePrologue();
jaroslav@1646: 
jaroslav@1646:         // Suppress this method in backtraces displayed to the user.
jaroslav@1646:         mv.visitAnnotation("Ljava/lang/invoke/LambdaForm$Hidden;", true);
jaroslav@1646: 
jaroslav@1646:         // Mark this method as a compiled LambdaForm
jaroslav@1646:         mv.visitAnnotation("Ljava/lang/invoke/LambdaForm$Compiled;", true);
jaroslav@1646: 
jaroslav@1646:         // Force inlining of this invoker method.
jaroslav@1646:         mv.visitAnnotation("Ljava/lang/invoke/ForceInline;", true);
jaroslav@1646: 
jaroslav@1646:         // iterate over the form's names, generating bytecode instructions for each
jaroslav@1646:         // start iterating at the first name following the arguments
jaroslav@1646:         for (int i = lambdaForm.arity; i < lambdaForm.names.length; i++) {
jaroslav@1646:             Name name = lambdaForm.names[i];
jaroslav@1646:             MemberName member = name.function.member();
jaroslav@1646: 
jaroslav@1646:             if (isSelectAlternative(member)) {
jaroslav@1646:                 // selectAlternative idiom
jaroslav@1646:                 // FIXME: make sure this idiom is really present!
jaroslav@1646:                 emitSelectAlternative(name, lambdaForm.names[i + 1]);
jaroslav@1646:                 i++;  // skip MH.invokeBasic of the selectAlternative result
jaroslav@1646:             } else if (isStaticallyInvocable(member)) {
jaroslav@1646:                 emitStaticInvoke(member, name);
jaroslav@1646:             } else {
jaroslav@1646:                 emitInvoke(name);
jaroslav@1646:             }
jaroslav@1646: 
jaroslav@1646:             // store the result from evaluating to the target name in a local if required
jaroslav@1646:             // (if this is the last value, i.e., the one that is going to be returned,
jaroslav@1646:             // avoid store/load/return and just return)
jaroslav@1646:             if (i == lambdaForm.names.length - 1 && i == lambdaForm.result) {
jaroslav@1646:                 // return value - do nothing
jaroslav@1646:             } else if (name.type != 'V') {
jaroslav@1646:                 // non-void: actually assign
jaroslav@1646:                 emitStoreInsn(name.type, name.index());
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         // return statement
jaroslav@1646:         emitReturn();
jaroslav@1646: 
jaroslav@1646:         classFileEpilogue();
jaroslav@1646:         bogusMethod(lambdaForm);
jaroslav@1646: 
jaroslav@1646:         final byte[] classFile = cw.toByteArray();
jaroslav@1646:         maybeDump(className, classFile);
jaroslav@1646:         return classFile;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Emit an invoke for the given name.
jaroslav@1646:      */
jaroslav@1646:     void emitInvoke(Name name) {
jaroslav@1646:         if (true) {
jaroslav@1646:             // push receiver
jaroslav@1646:             MethodHandle target = name.function.resolvedHandle;
jaroslav@1646:             assert(target != null) : name.exprString();
jaroslav@1646:             mv.visitLdcInsn(constantPlaceholder(target));
jaroslav@1646:             mv.visitTypeInsn(Opcodes.CHECKCAST, MH);
jaroslav@1646:         } else {
jaroslav@1646:             // load receiver
jaroslav@1646:             emitAloadInsn(0);
jaroslav@1646:             mv.visitTypeInsn(Opcodes.CHECKCAST, MH);
jaroslav@1646:             mv.visitFieldInsn(Opcodes.GETFIELD, MH, "form", LF_SIG);
jaroslav@1646:             mv.visitFieldInsn(Opcodes.GETFIELD, LF, "names", LFN_SIG);
jaroslav@1646:             // TODO more to come
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         // push arguments
jaroslav@1646:         for (int i = 0; i < name.arguments.length; i++) {
jaroslav@1646:             emitPushArgument(name, i);
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         // invocation
jaroslav@1646:         MethodType type = name.function.methodType();
jaroslav@1646:         mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, MH, "invokeBasic", type.basicType().toMethodDescriptorString());
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     static private Class<?>[] STATICALLY_INVOCABLE_PACKAGES = {
jaroslav@1646:         // Sample classes from each package we are willing to bind to statically:
jaroslav@1646:         java.lang.Object.class,
jaroslav@1646:         java.util.Arrays.class,
jaroslav@1646:         sun.misc.Unsafe.class
jaroslav@1646:         //MethodHandle.class already covered
jaroslav@1646:     };
jaroslav@1646: 
jaroslav@1646:     static boolean isStaticallyInvocable(MemberName member) {
jaroslav@1646:         if (member == null)  return false;
jaroslav@1646:         if (member.isConstructor())  return false;
jaroslav@1646:         Class<?> cls = member.getDeclaringClass();
jaroslav@1646:         if (cls.isArray() || cls.isPrimitive())
jaroslav@1646:             return false;  // FIXME
jaroslav@1646:         if (cls.isAnonymousClass() || cls.isLocalClass())
jaroslav@1646:             return false;  // inner class of some sort
jaroslav@1646:         if (cls.getClassLoader() != MethodHandle.class.getClassLoader())
jaroslav@1646:             return false;  // not on BCP
jaroslav@1646:         MethodType mtype = member.getMethodOrFieldType();
jaroslav@1646:         if (!isStaticallyNameable(mtype.returnType()))
jaroslav@1646:             return false;
jaroslav@1646:         for (Class<?> ptype : mtype.parameterArray())
jaroslav@1646:             if (!isStaticallyNameable(ptype))
jaroslav@1646:                 return false;
jaroslav@1646:         if (!member.isPrivate() && VerifyAccess.isSamePackage(MethodHandle.class, cls))
jaroslav@1646:             return true;   // in java.lang.invoke package
jaroslav@1646:         if (member.isPublic() && isStaticallyNameable(cls))
jaroslav@1646:             return true;
jaroslav@1646:         return false;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     static boolean isStaticallyNameable(Class<?> cls) {
jaroslav@1646:         while (cls.isArray())
jaroslav@1646:             cls = cls.getComponentType();
jaroslav@1646:         if (cls.isPrimitive())
jaroslav@1646:             return true;  // int[].class, for example
jaroslav@1646:         // could use VerifyAccess.isClassAccessible but the following is a safe approximation
jaroslav@1646:         if (cls.getClassLoader() != Object.class.getClassLoader())
jaroslav@1646:             return false;
jaroslav@1646:         if (VerifyAccess.isSamePackage(MethodHandle.class, cls))
jaroslav@1646:             return true;
jaroslav@1646:         if (!Modifier.isPublic(cls.getModifiers()))
jaroslav@1646:             return false;
jaroslav@1646:         for (Class<?> pkgcls : STATICALLY_INVOCABLE_PACKAGES) {
jaroslav@1646:             if (VerifyAccess.isSamePackage(pkgcls, cls))
jaroslav@1646:                 return true;
jaroslav@1646:         }
jaroslav@1646:         return false;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Emit an invoke for the given name, using the MemberName directly.
jaroslav@1646:      */
jaroslav@1646:     void emitStaticInvoke(MemberName member, Name name) {
jaroslav@1646:         assert(member.equals(name.function.member()));
jaroslav@1646:         String cname = getInternalName(member.getDeclaringClass());
jaroslav@1646:         String mname = member.getName();
jaroslav@1646:         String mtype;
jaroslav@1646:         byte refKind = member.getReferenceKind();
jaroslav@1646:         if (refKind == REF_invokeSpecial) {
jaroslav@1646:             // in order to pass the verifier, we need to convert this to invokevirtual in all cases
jaroslav@1646:             assert(member.canBeStaticallyBound()) : member;
jaroslav@1646:             refKind = REF_invokeVirtual;
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         if (member.getDeclaringClass().isInterface() && refKind == REF_invokeVirtual) {
jaroslav@1646:             // Methods from Object declared in an interface can be resolved by JVM to invokevirtual kind.
jaroslav@1646:             // Need to convert it back to invokeinterface to pass verification and make the invocation works as expected.
jaroslav@1646:             refKind = REF_invokeInterface;
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         // push arguments
jaroslav@1646:         for (int i = 0; i < name.arguments.length; i++) {
jaroslav@1646:             emitPushArgument(name, i);
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         // invocation
jaroslav@1646:         if (member.isMethod()) {
jaroslav@1646:             mtype = member.getMethodType().toMethodDescriptorString();
jaroslav@1646:             mv.visitMethodInsn(refKindOpcode(refKind), cname, mname, mtype,
jaroslav@1646:                                member.getDeclaringClass().isInterface());
jaroslav@1646:         } else {
jaroslav@1646:             mtype = MethodType.toFieldDescriptorString(member.getFieldType());
jaroslav@1646:             mv.visitFieldInsn(refKindOpcode(refKind), cname, mname, mtype);
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646:     int refKindOpcode(byte refKind) {
jaroslav@1646:         switch (refKind) {
jaroslav@1646:         case REF_invokeVirtual:      return Opcodes.INVOKEVIRTUAL;
jaroslav@1646:         case REF_invokeStatic:       return Opcodes.INVOKESTATIC;
jaroslav@1646:         case REF_invokeSpecial:      return Opcodes.INVOKESPECIAL;
jaroslav@1646:         case REF_invokeInterface:    return Opcodes.INVOKEINTERFACE;
jaroslav@1646:         case REF_getField:           return Opcodes.GETFIELD;
jaroslav@1646:         case REF_putField:           return Opcodes.PUTFIELD;
jaroslav@1646:         case REF_getStatic:          return Opcodes.GETSTATIC;
jaroslav@1646:         case REF_putStatic:          return Opcodes.PUTSTATIC;
jaroslav@1646:         }
jaroslav@1646:         throw new InternalError("refKind="+refKind);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Check if MemberName is a call to MethodHandleImpl.selectAlternative.
jaroslav@1646:      */
jaroslav@1646:     private boolean isSelectAlternative(MemberName member) {
jaroslav@1646:         return member != null &&
jaroslav@1646:                member.getDeclaringClass() == MethodHandleImpl.class &&
jaroslav@1646:                member.getName().equals("selectAlternative");
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Emit bytecode for the selectAlternative idiom.
jaroslav@1646:      *
jaroslav@1646:      * The pattern looks like (Cf. MethodHandleImpl.makeGuardWithTest):
jaroslav@1646:      * <blockquote><pre>{@code
jaroslav@1646:      *   Lambda(a0:L,a1:I)=>{
jaroslav@1646:      *     t2:I=foo.test(a1:I);
jaroslav@1646:      *     t3:L=MethodHandleImpl.selectAlternative(t2:I,(MethodHandle(int)int),(MethodHandle(int)int));
jaroslav@1646:      *     t4:I=MethodHandle.invokeBasic(t3:L,a1:I);t4:I}
jaroslav@1646:      * }</pre></blockquote>
jaroslav@1646:      */
jaroslav@1646:     private void emitSelectAlternative(Name selectAlternativeName, Name invokeBasicName) {
jaroslav@1646:         MethodType type = selectAlternativeName.function.methodType();
jaroslav@1646: 
jaroslav@1646:         Name receiver = (Name) invokeBasicName.arguments[0];
jaroslav@1646: 
jaroslav@1646:         Label L_fallback = new Label();
jaroslav@1646:         Label L_done     = new Label();
jaroslav@1646: 
jaroslav@1646:         // load test result
jaroslav@1646:         emitPushArgument(selectAlternativeName, 0);
jaroslav@1646:         mv.visitInsn(Opcodes.ICONST_1);
jaroslav@1646: 
jaroslav@1646:         // if_icmpne L_fallback
jaroslav@1646:         mv.visitJumpInsn(Opcodes.IF_ICMPNE, L_fallback);
jaroslav@1646: 
jaroslav@1646:         // invoke selectAlternativeName.arguments[1]
jaroslav@1646:         MethodHandle target = (MethodHandle) selectAlternativeName.arguments[1];
jaroslav@1646:         emitPushArgument(selectAlternativeName, 1);  // get 2nd argument of selectAlternative
jaroslav@1646:         emitAstoreInsn(receiver.index());  // store the MH in the receiver slot
jaroslav@1646:         emitInvoke(invokeBasicName);
jaroslav@1646: 
jaroslav@1646:         // goto L_done
jaroslav@1646:         mv.visitJumpInsn(Opcodes.GOTO, L_done);
jaroslav@1646: 
jaroslav@1646:         // L_fallback:
jaroslav@1646:         mv.visitLabel(L_fallback);
jaroslav@1646: 
jaroslav@1646:         // invoke selectAlternativeName.arguments[2]
jaroslav@1646:         MethodHandle fallback = (MethodHandle) selectAlternativeName.arguments[2];
jaroslav@1646:         emitPushArgument(selectAlternativeName, 2);  // get 3rd argument of selectAlternative
jaroslav@1646:         emitAstoreInsn(receiver.index());  // store the MH in the receiver slot
jaroslav@1646:         emitInvoke(invokeBasicName);
jaroslav@1646: 
jaroslav@1646:         // L_done:
jaroslav@1646:         mv.visitLabel(L_done);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private void emitPushArgument(Name name, int paramIndex) {
jaroslav@1646:         Object arg = name.arguments[paramIndex];
jaroslav@1646:         char ptype = name.function.parameterType(paramIndex);
jaroslav@1646:         MethodType mtype = name.function.methodType();
jaroslav@1646:         if (arg instanceof Name) {
jaroslav@1646:             Name n = (Name) arg;
jaroslav@1646:             emitLoadInsn(n.type, n.index());
jaroslav@1646:             emitImplicitConversion(n.type, mtype.parameterType(paramIndex));
jaroslav@1646:         } else if ((arg == null || arg instanceof String) && ptype == 'L') {
jaroslav@1646:             emitConst(arg);
jaroslav@1646:         } else {
jaroslav@1646:             if (Wrapper.isWrapperType(arg.getClass()) && ptype != 'L') {
jaroslav@1646:                 emitConst(arg);
jaroslav@1646:             } else {
jaroslav@1646:                 mv.visitLdcInsn(constantPlaceholder(arg));
jaroslav@1646:                 emitImplicitConversion('L', mtype.parameterType(paramIndex));
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Emits a return statement from a LF invoker. If required, the result type is cast to the correct return type.
jaroslav@1646:      */
jaroslav@1646:     private void emitReturn() {
jaroslav@1646:         // return statement
jaroslav@1646:         if (lambdaForm.result == -1) {
jaroslav@1646:             // void
jaroslav@1646:             mv.visitInsn(Opcodes.RETURN);
jaroslav@1646:         } else {
jaroslav@1646:             LambdaForm.Name rn = lambdaForm.names[lambdaForm.result];
jaroslav@1646:             char rtype = Wrapper.basicTypeChar(invokerType.returnType());
jaroslav@1646: 
jaroslav@1646:             // put return value on the stack if it is not already there
jaroslav@1646:             if (lambdaForm.result != lambdaForm.names.length - 1) {
jaroslav@1646:                 emitLoadInsn(rn.type, lambdaForm.result);
jaroslav@1646:             }
jaroslav@1646: 
jaroslav@1646:             // potentially generate cast
jaroslav@1646:             // rtype is the return type of the invoker - generated code must conform to this
jaroslav@1646:             // rn.type is the type of the result Name in the LF
jaroslav@1646:             if (rtype != rn.type) {
jaroslav@1646:                 // need cast
jaroslav@1646:                 if (rtype == 'L') {
jaroslav@1646:                     // possibly cast the primitive to the correct type for boxing
jaroslav@1646:                     char boxedType = Wrapper.forWrapperType(invokerType.returnType()).basicTypeChar();
jaroslav@1646:                     if (boxedType != rn.type) {
jaroslav@1646:                         emitPrimCast(rn.type, boxedType);
jaroslav@1646:                     }
jaroslav@1646:                     // cast primitive to reference ("boxing")
jaroslav@1646:                     emitBoxing(invokerType.returnType());
jaroslav@1646:                 } else {
jaroslav@1646:                     // to-primitive cast
jaroslav@1646:                     if (rn.type != 'L') {
jaroslav@1646:                         // prim-to-prim cast
jaroslav@1646:                         emitPrimCast(rn.type, rtype);
jaroslav@1646:                     } else {
jaroslav@1646:                         // ref-to-prim cast ("unboxing")
jaroslav@1646:                         throw new InternalError("no ref-to-prim (unboxing) casts supported right now");
jaroslav@1646:                     }
jaroslav@1646:                 }
jaroslav@1646:             }
jaroslav@1646: 
jaroslav@1646:             // generate actual return statement
jaroslav@1646:             emitReturnInsn(invokerType.returnType());
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Emit a type conversion bytecode casting from "from" to "to".
jaroslav@1646:      */
jaroslav@1646:     private void emitPrimCast(char from, char to) {
jaroslav@1646:         // Here's how.
jaroslav@1646:         // -   indicates forbidden
jaroslav@1646:         // <-> indicates implicit
jaroslav@1646:         //      to ----> boolean  byte     short    char     int      long     float    double
jaroslav@1646:         // from boolean    <->        -        -        -        -        -        -        -
jaroslav@1646:         //      byte        -       <->       i2s      i2c      <->      i2l      i2f      i2d
jaroslav@1646:         //      short       -       i2b       <->      i2c      <->      i2l      i2f      i2d
jaroslav@1646:         //      char        -       i2b       i2s      <->      <->      i2l      i2f      i2d
jaroslav@1646:         //      int         -       i2b       i2s      i2c      <->      i2l      i2f      i2d
jaroslav@1646:         //      long        -     l2i,i2b   l2i,i2s  l2i,i2c    l2i      <->      l2f      l2d
jaroslav@1646:         //      float       -     f2i,i2b   f2i,i2s  f2i,i2c    f2i      f2l      <->      f2d
jaroslav@1646:         //      double      -     d2i,i2b   d2i,i2s  d2i,i2c    d2i      d2l      d2f      <->
jaroslav@1646:         if (from == to) {
jaroslav@1646:             // no cast required, should be dead code anyway
jaroslav@1646:             return;
jaroslav@1646:         }
jaroslav@1646:         Wrapper wfrom = Wrapper.forBasicType(from);
jaroslav@1646:         Wrapper wto   = Wrapper.forBasicType(to);
jaroslav@1646:         if (wfrom.isSubwordOrInt()) {
jaroslav@1646:             // cast from {byte,short,char,int} to anything
jaroslav@1646:             emitI2X(to);
jaroslav@1646:         } else {
jaroslav@1646:             // cast from {long,float,double} to anything
jaroslav@1646:             if (wto.isSubwordOrInt()) {
jaroslav@1646:                 // cast to {byte,short,char,int}
jaroslav@1646:                 emitX2I(from);
jaroslav@1646:                 if (wto.bitWidth() < 32) {
jaroslav@1646:                     // targets other than int require another conversion
jaroslav@1646:                     emitI2X(to);
jaroslav@1646:                 }
jaroslav@1646:             } else {
jaroslav@1646:                 // cast to {long,float,double} - this is verbose
jaroslav@1646:                 boolean error = false;
jaroslav@1646:                 switch (from) {
jaroslav@1646:                 case 'J':
jaroslav@1646:                          if (to == 'F') { mv.visitInsn(Opcodes.L2F); }
jaroslav@1646:                     else if (to == 'D') { mv.visitInsn(Opcodes.L2D); }
jaroslav@1646:                     else error = true;
jaroslav@1646:                     break;
jaroslav@1646:                 case 'F':
jaroslav@1646:                          if (to == 'J') { mv.visitInsn(Opcodes.F2L); }
jaroslav@1646:                     else if (to == 'D') { mv.visitInsn(Opcodes.F2D); }
jaroslav@1646:                     else error = true;
jaroslav@1646:                     break;
jaroslav@1646:                 case 'D':
jaroslav@1646:                          if (to == 'J') { mv.visitInsn(Opcodes.D2L); }
jaroslav@1646:                     else if (to == 'F') { mv.visitInsn(Opcodes.D2F); }
jaroslav@1646:                     else error = true;
jaroslav@1646:                     break;
jaroslav@1646:                 default:
jaroslav@1646:                     error = true;
jaroslav@1646:                     break;
jaroslav@1646:                 }
jaroslav@1646:                 if (error) {
jaroslav@1646:                     throw new IllegalStateException("unhandled prim cast: " + from + "2" + to);
jaroslav@1646:                 }
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private void emitI2X(char type) {
jaroslav@1646:         switch (type) {
jaroslav@1646:         case 'B':  mv.visitInsn(Opcodes.I2B);  break;
jaroslav@1646:         case 'S':  mv.visitInsn(Opcodes.I2S);  break;
jaroslav@1646:         case 'C':  mv.visitInsn(Opcodes.I2C);  break;
jaroslav@1646:         case 'I':  /* naught */                break;
jaroslav@1646:         case 'J':  mv.visitInsn(Opcodes.I2L);  break;
jaroslav@1646:         case 'F':  mv.visitInsn(Opcodes.I2F);  break;
jaroslav@1646:         case 'D':  mv.visitInsn(Opcodes.I2D);  break;
jaroslav@1646:         case 'Z':
jaroslav@1646:             // For compatibility with ValueConversions and explicitCastArguments:
jaroslav@1646:             mv.visitInsn(Opcodes.ICONST_1);
jaroslav@1646:             mv.visitInsn(Opcodes.IAND);
jaroslav@1646:             break;
jaroslav@1646:         default:   throw new InternalError("unknown type: " + type);
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private void emitX2I(char type) {
jaroslav@1646:         switch (type) {
jaroslav@1646:         case 'J':  mv.visitInsn(Opcodes.L2I);  break;
jaroslav@1646:         case 'F':  mv.visitInsn(Opcodes.F2I);  break;
jaroslav@1646:         case 'D':  mv.visitInsn(Opcodes.D2I);  break;
jaroslav@1646:         default:   throw new InternalError("unknown type: " + type);
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private static String basicTypeCharSignature(String prefix, MethodType type) {
jaroslav@1646:         StringBuilder buf = new StringBuilder(prefix);
jaroslav@1646:         for (Class<?> ptype : type.parameterList())
jaroslav@1646:             buf.append(Wrapper.forBasicType(ptype).basicTypeChar());
jaroslav@1646:         buf.append('_').append(Wrapper.forBasicType(type.returnType()).basicTypeChar());
jaroslav@1646:         return buf.toString();
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Generate bytecode for a LambdaForm.vmentry which calls interpretWithArguments.
jaroslav@1646:      */
jaroslav@1646:     static MemberName generateLambdaFormInterpreterEntryPoint(String sig) {
jaroslav@1646:         assert(LambdaForm.isValidSignature(sig));
jaroslav@1646:         //System.out.println("generateExactInvoker "+sig);
jaroslav@1646:         // compute method type
jaroslav@1646:         // first parameter and return type
jaroslav@1646:         char tret = LambdaForm.signatureReturn(sig);
jaroslav@1646:         MethodType type = MethodType.methodType(LambdaForm.typeClass(tret), MethodHandle.class);
jaroslav@1646:         // other parameter types
jaroslav@1646:         int arity = LambdaForm.signatureArity(sig);
jaroslav@1646:         for (int i = 1; i < arity; i++) {
jaroslav@1646:             type = type.appendParameterTypes(LambdaForm.typeClass(sig.charAt(i)));
jaroslav@1646:         }
jaroslav@1646:         InvokerBytecodeGenerator g = new InvokerBytecodeGenerator("LFI", "interpret_"+tret, type);
jaroslav@1646:         return g.loadMethod(g.generateLambdaFormInterpreterEntryPointBytes());
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private byte[] generateLambdaFormInterpreterEntryPointBytes() {
jaroslav@1646:         classFilePrologue();
jaroslav@1646: 
jaroslav@1646:         // Suppress this method in backtraces displayed to the user.
jaroslav@1646:         mv.visitAnnotation("Ljava/lang/invoke/LambdaForm$Hidden;", true);
jaroslav@1646: 
jaroslav@1646:         // Don't inline the interpreter entry.
jaroslav@1646:         mv.visitAnnotation("Ljava/lang/invoke/DontInline;", true);
jaroslav@1646: 
jaroslav@1646:         // create parameter array
jaroslav@1646:         emitIconstInsn(invokerType.parameterCount());
jaroslav@1646:         mv.visitTypeInsn(Opcodes.ANEWARRAY, "java/lang/Object");
jaroslav@1646: 
jaroslav@1646:         // fill parameter array
jaroslav@1646:         for (int i = 0; i < invokerType.parameterCount(); i++) {
jaroslav@1646:             Class<?> ptype = invokerType.parameterType(i);
jaroslav@1646:             mv.visitInsn(Opcodes.DUP);
jaroslav@1646:             emitIconstInsn(i);
jaroslav@1646:             emitLoadInsn(Wrapper.basicTypeChar(ptype), i);
jaroslav@1646:             // box if primitive type
jaroslav@1646:             if (ptype.isPrimitive()) {
jaroslav@1646:                 emitBoxing(ptype);
jaroslav@1646:             }
jaroslav@1646:             mv.visitInsn(Opcodes.AASTORE);
jaroslav@1646:         }
jaroslav@1646:         // invoke
jaroslav@1646:         emitAloadInsn(0);
jaroslav@1646:         mv.visitFieldInsn(Opcodes.GETFIELD, MH, "form", "Ljava/lang/invoke/LambdaForm;");
jaroslav@1646:         mv.visitInsn(Opcodes.SWAP);  // swap form and array; avoid local variable
jaroslav@1646:         mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, LF, "interpretWithArguments", "([Ljava/lang/Object;)Ljava/lang/Object;");
jaroslav@1646: 
jaroslav@1646:         // maybe unbox
jaroslav@1646:         Class<?> rtype = invokerType.returnType();
jaroslav@1646:         if (rtype.isPrimitive() && rtype != void.class) {
jaroslav@1646:             emitUnboxing(Wrapper.asWrapperType(rtype));
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         // return statement
jaroslav@1646:         emitReturnInsn(rtype);
jaroslav@1646: 
jaroslav@1646:         classFileEpilogue();
jaroslav@1646:         bogusMethod(invokerType);
jaroslav@1646: 
jaroslav@1646:         final byte[] classFile = cw.toByteArray();
jaroslav@1646:         maybeDump(className, classFile);
jaroslav@1646:         return classFile;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Generate bytecode for a NamedFunction invoker.
jaroslav@1646:      */
jaroslav@1646:     static MemberName generateNamedFunctionInvoker(MethodTypeForm typeForm) {
jaroslav@1646:         MethodType invokerType = LambdaForm.NamedFunction.INVOKER_METHOD_TYPE;
jaroslav@1646:         String invokerName = basicTypeCharSignature("invoke_", typeForm.erasedType());
jaroslav@1646:         InvokerBytecodeGenerator g = new InvokerBytecodeGenerator("NFI", invokerName, invokerType);
jaroslav@1646:         return g.loadMethod(g.generateNamedFunctionInvokerImpl(typeForm));
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     static int nfi = 0;
jaroslav@1646: 
jaroslav@1646:     private byte[] generateNamedFunctionInvokerImpl(MethodTypeForm typeForm) {
jaroslav@1646:         MethodType dstType = typeForm.erasedType();
jaroslav@1646:         classFilePrologue();
jaroslav@1646: 
jaroslav@1646:         // Suppress this method in backtraces displayed to the user.
jaroslav@1646:         mv.visitAnnotation("Ljava/lang/invoke/LambdaForm$Hidden;", true);
jaroslav@1646: 
jaroslav@1646:         // Force inlining of this invoker method.
jaroslav@1646:         mv.visitAnnotation("Ljava/lang/invoke/ForceInline;", true);
jaroslav@1646: 
jaroslav@1646:         // Load receiver
jaroslav@1646:         emitAloadInsn(0);
jaroslav@1646: 
jaroslav@1646:         // Load arguments from array
jaroslav@1646:         for (int i = 0; i < dstType.parameterCount(); i++) {
jaroslav@1646:             emitAloadInsn(1);
jaroslav@1646:             emitIconstInsn(i);
jaroslav@1646:             mv.visitInsn(Opcodes.AALOAD);
jaroslav@1646: 
jaroslav@1646:             // Maybe unbox
jaroslav@1646:             Class<?> dptype = dstType.parameterType(i);
jaroslav@1646:             if (dptype.isPrimitive()) {
jaroslav@1646:                 Class<?> sptype = dstType.basicType().wrap().parameterType(i);
jaroslav@1646:                 Wrapper dstWrapper = Wrapper.forBasicType(dptype);
jaroslav@1646:                 Wrapper srcWrapper = dstWrapper.isSubwordOrInt() ? Wrapper.INT : dstWrapper;  // narrow subword from int
jaroslav@1646:                 emitUnboxing(srcWrapper.wrapperType());
jaroslav@1646:                 emitPrimCast(srcWrapper.basicTypeChar(), dstWrapper.basicTypeChar());
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         // Invoke
jaroslav@1646:         String targetDesc = dstType.basicType().toMethodDescriptorString();
jaroslav@1646:         mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, MH, "invokeBasic", targetDesc);
jaroslav@1646: 
jaroslav@1646:         // Box primitive types
jaroslav@1646:         Class<?> rtype = dstType.returnType();
jaroslav@1646:         if (rtype != void.class && rtype.isPrimitive()) {
jaroslav@1646:             Wrapper srcWrapper = Wrapper.forBasicType(rtype);
jaroslav@1646:             Wrapper dstWrapper = srcWrapper.isSubwordOrInt() ? Wrapper.INT : srcWrapper;  // widen subword to int
jaroslav@1646:             // boolean casts not allowed
jaroslav@1646:             emitPrimCast(srcWrapper.basicTypeChar(), dstWrapper.basicTypeChar());
jaroslav@1646:             emitBoxing(dstWrapper.primitiveType());
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         // If the return type is void we return a null reference.
jaroslav@1646:         if (rtype == void.class) {
jaroslav@1646:             mv.visitInsn(Opcodes.ACONST_NULL);
jaroslav@1646:         }
jaroslav@1646:         emitReturnInsn(Object.class);  // NOTE: NamedFunction invokers always return a reference value.
jaroslav@1646: 
jaroslav@1646:         classFileEpilogue();
jaroslav@1646:         bogusMethod(dstType);
jaroslav@1646: 
jaroslav@1646:         final byte[] classFile = cw.toByteArray();
jaroslav@1646:         maybeDump(className, classFile);
jaroslav@1646:         return classFile;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Emit a bogus method that just loads some string constants. This is to get the constants into the constant pool
jaroslav@1646:      * for debugging purposes.
jaroslav@1646:      */
jaroslav@1646:     private void bogusMethod(Object... os) {
jaroslav@1646:         if (DUMP_CLASS_FILES) {
jaroslav@1646:             mv = cw.visitMethod(Opcodes.ACC_STATIC, "dummy", "()V", null, null);
jaroslav@1646:             for (Object o : os) {
jaroslav@1646:                 mv.visitLdcInsn(o.toString());
jaroslav@1646:                 mv.visitInsn(Opcodes.POP);
jaroslav@1646:             }
jaroslav@1646:             mv.visitInsn(Opcodes.RETURN);
jaroslav@1646:             mv.visitMaxs(0, 0);
jaroslav@1646:             mv.visitEnd();
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: }