| /*** |
| * ASM: a very small and fast Java bytecode manipulation framework |
| * Copyright (c) 2000-2011 INRIA, France Telecom |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the copyright holders nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| package org.eclipse.sisu.space.asm; |
| |
| /** |
| * A {@link ClassVisitor} that generates classes in bytecode form. More |
| * precisely this visitor generates a byte array conforming to the Java class |
| * file format. It can be used alone, to generate a Java class "from scratch", |
| * or with one or more {@link ClassReader ClassReader} and adapter class visitor |
| * to generate a modified class from one or more existing Java classes. |
| * |
| * @author Eric Bruneton |
| */ |
| public final class ClassWriter extends ClassVisitor { |
| |
| /** |
| * Flag to automatically compute the maximum stack size and the maximum |
| * number of local variables of methods. If this flag is set, then the |
| * arguments of the {@link MethodVisitor#visitMaxs visitMaxs} method of the |
| * {@link MethodVisitor} returned by the {@link #visitMethod visitMethod} |
| * method will be ignored, and computed automatically from the signature and |
| * the bytecode of each method. |
| * |
| * @see #ClassWriter(int) |
| */ |
| public static final int COMPUTE_MAXS = 1; |
| |
| /** |
| * Flag to automatically compute the stack map frames of methods from |
| * scratch. If this flag is set, then the calls to the |
| * {@link MethodVisitor#visitFrame} method are ignored, and the stack map |
| * frames are recomputed from the methods bytecode. The arguments of the |
| * {@link MethodVisitor#visitMaxs visitMaxs} method are also ignored and |
| * recomputed from the bytecode. In other words, computeFrames implies |
| * computeMaxs. |
| * |
| * @see #ClassWriter(int) |
| */ |
| public static final int COMPUTE_FRAMES = 2; |
| |
| /** |
| * Pseudo access flag to distinguish between the synthetic attribute and the |
| * synthetic access flag. |
| */ |
| static final int ACC_SYNTHETIC_ATTRIBUTE = 0x40000; |
| |
| /** |
| * Factor to convert from ACC_SYNTHETIC_ATTRIBUTE to Opcode.ACC_SYNTHETIC. |
| */ |
| static final int TO_ACC_SYNTHETIC = ACC_SYNTHETIC_ATTRIBUTE |
| / Opcodes.ACC_SYNTHETIC; |
| |
| /** |
| * The type of instructions without any argument. |
| */ |
| static final int NOARG_INSN = 0; |
| |
| /** |
| * The type of instructions with an signed byte argument. |
| */ |
| static final int SBYTE_INSN = 1; |
| |
| /** |
| * The type of instructions with an signed short argument. |
| */ |
| static final int SHORT_INSN = 2; |
| |
| /** |
| * The type of instructions with a local variable index argument. |
| */ |
| static final int VAR_INSN = 3; |
| |
| /** |
| * The type of instructions with an implicit local variable index argument. |
| */ |
| static final int IMPLVAR_INSN = 4; |
| |
| /** |
| * The type of instructions with a type descriptor argument. |
| */ |
| static final int TYPE_INSN = 5; |
| |
| /** |
| * The type of field and method invocations instructions. |
| */ |
| static final int FIELDORMETH_INSN = 6; |
| |
| /** |
| * The type of the INVOKEINTERFACE/INVOKEDYNAMIC instruction. |
| */ |
| static final int ITFMETH_INSN = 7; |
| |
| /** |
| * The type of the INVOKEDYNAMIC instruction. |
| */ |
| static final int INDYMETH_INSN = 8; |
| |
| /** |
| * The type of instructions with a 2 bytes bytecode offset label. |
| */ |
| static final int LABEL_INSN = 9; |
| |
| /** |
| * The type of instructions with a 4 bytes bytecode offset label. |
| */ |
| static final int LABELW_INSN = 10; |
| |
| /** |
| * The type of the LDC instruction. |
| */ |
| static final int LDC_INSN = 11; |
| |
| /** |
| * The type of the LDC_W and LDC2_W instructions. |
| */ |
| static final int LDCW_INSN = 12; |
| |
| /** |
| * The type of the IINC instruction. |
| */ |
| static final int IINC_INSN = 13; |
| |
| /** |
| * The type of the TABLESWITCH instruction. |
| */ |
| static final int TABL_INSN = 14; |
| |
| /** |
| * The type of the LOOKUPSWITCH instruction. |
| */ |
| static final int LOOK_INSN = 15; |
| |
| /** |
| * The type of the MULTIANEWARRAY instruction. |
| */ |
| static final int MANA_INSN = 16; |
| |
| /** |
| * The type of the WIDE instruction. |
| */ |
| static final int WIDE_INSN = 17; |
| |
| /** |
| * The instruction types of all JVM opcodes. |
| */ |
| static final byte[] TYPE; |
| |
| /** |
| * The type of CONSTANT_Class constant pool items. |
| */ |
| static final int CLASS = 7; |
| |
| /** |
| * The type of CONSTANT_Fieldref constant pool items. |
| */ |
| static final int FIELD = 9; |
| |
| /** |
| * The type of CONSTANT_Methodref constant pool items. |
| */ |
| static final int METH = 10; |
| |
| /** |
| * The type of CONSTANT_InterfaceMethodref constant pool items. |
| */ |
| static final int IMETH = 11; |
| |
| /** |
| * The type of CONSTANT_String constant pool items. |
| */ |
| static final int STR = 8; |
| |
| /** |
| * The type of CONSTANT_Integer constant pool items. |
| */ |
| static final int INT = 3; |
| |
| /** |
| * The type of CONSTANT_Float constant pool items. |
| */ |
| static final int FLOAT = 4; |
| |
| /** |
| * The type of CONSTANT_Long constant pool items. |
| */ |
| static final int LONG = 5; |
| |
| /** |
| * The type of CONSTANT_Double constant pool items. |
| */ |
| static final int DOUBLE = 6; |
| |
| /** |
| * The type of CONSTANT_NameAndType constant pool items. |
| */ |
| static final int NAME_TYPE = 12; |
| |
| /** |
| * The type of CONSTANT_Utf8 constant pool items. |
| */ |
| static final int UTF8 = 1; |
| |
| /** |
| * The type of CONSTANT_MethodType constant pool items. |
| */ |
| static final int MTYPE = 16; |
| |
| /** |
| * The type of CONSTANT_MethodHandle constant pool items. |
| */ |
| static final int HANDLE = 15; |
| |
| /** |
| * The type of CONSTANT_InvokeDynamic constant pool items. |
| */ |
| static final int INDY = 18; |
| |
| /** |
| * The base value for all CONSTANT_MethodHandle constant pool items. |
| * Internally, ASM store the 9 variations of CONSTANT_MethodHandle into 9 |
| * different items. |
| */ |
| static final int HANDLE_BASE = 20; |
| |
| /** |
| * Normal type Item stored in the ClassWriter {@link ClassWriter#typeTable}, |
| * instead of the constant pool, in order to avoid clashes with normal |
| * constant pool items in the ClassWriter constant pool's hash table. |
| */ |
| static final int TYPE_NORMAL = 30; |
| |
| /** |
| * Uninitialized type Item stored in the ClassWriter |
| * {@link ClassWriter#typeTable}, instead of the constant pool, in order to |
| * avoid clashes with normal constant pool items in the ClassWriter constant |
| * pool's hash table. |
| */ |
| static final int TYPE_UNINIT = 31; |
| |
| /** |
| * Merged type Item stored in the ClassWriter {@link ClassWriter#typeTable}, |
| * instead of the constant pool, in order to avoid clashes with normal |
| * constant pool items in the ClassWriter constant pool's hash table. |
| */ |
| static final int TYPE_MERGED = 32; |
| |
| /** |
| * The type of BootstrapMethods items. These items are stored in a special |
| * class attribute named BootstrapMethods and not in the constant pool. |
| */ |
| static final int BSM = 33; |
| |
| /** |
| * The class reader from which this class writer was constructed, if any. |
| */ |
| ClassReader cr; |
| |
| /** |
| * Minor and major version numbers of the class to be generated. |
| */ |
| int version; |
| |
| /** |
| * Index of the next item to be added in the constant pool. |
| */ |
| int index; |
| |
| /** |
| * The constant pool of this class. |
| */ |
| final ByteVector pool; |
| |
| /** |
| * The constant pool's hash table data. |
| */ |
| Item[] items; |
| |
| /** |
| * The threshold of the constant pool's hash table. |
| */ |
| int threshold; |
| |
| /** |
| * A reusable key used to look for items in the {@link #items} hash table. |
| */ |
| final Item key; |
| |
| /** |
| * A reusable key used to look for items in the {@link #items} hash table. |
| */ |
| final Item key2; |
| |
| /** |
| * A reusable key used to look for items in the {@link #items} hash table. |
| */ |
| final Item key3; |
| |
| /** |
| * A reusable key used to look for items in the {@link #items} hash table. |
| */ |
| final Item key4; |
| |
| /** |
| * A type table used to temporarily store internal names that will not |
| * necessarily be stored in the constant pool. This type table is used by |
| * the control flow and data flow analysis algorithm used to compute stack |
| * map frames from scratch. This array associates to each index <tt>i</tt> |
| * the Item whose index is <tt>i</tt>. All Item objects stored in this array |
| * are also stored in the {@link #items} hash table. These two arrays allow |
| * to retrieve an Item from its index or, conversely, to get the index of an |
| * Item from its value. Each Item stores an internal name in its |
| * {@link Item#strVal1} field. |
| */ |
| Item[] typeTable; |
| |
| /** |
| * Number of elements in the {@link #typeTable} array. |
| */ |
| private short typeCount; |
| |
| /** |
| * The access flags of this class. |
| */ |
| private int access; |
| |
| /** |
| * The constant pool item that contains the internal name of this class. |
| */ |
| private int name; |
| |
| /** |
| * The internal name of this class. |
| */ |
| String thisName; |
| |
| /** |
| * The constant pool item that contains the signature of this class. |
| */ |
| private int signature; |
| |
| /** |
| * The constant pool item that contains the internal name of the super class |
| * of this class. |
| */ |
| private int superName; |
| |
| /** |
| * Number of interfaces implemented or extended by this class or interface. |
| */ |
| private int interfaceCount; |
| |
| /** |
| * The interfaces implemented or extended by this class or interface. More |
| * precisely, this array contains the indexes of the constant pool items |
| * that contain the internal names of these interfaces. |
| */ |
| private int[] interfaces; |
| |
| /** |
| * The index of the constant pool item that contains the name of the source |
| * file from which this class was compiled. |
| */ |
| private int sourceFile; |
| |
| /** |
| * The SourceDebug attribute of this class. |
| */ |
| private ByteVector sourceDebug; |
| |
| /** |
| * The module attribute of this class. |
| */ |
| private ModuleWriter moduleWriter; |
| |
| /** |
| * The constant pool item that contains the name of the enclosing class of |
| * this class. |
| */ |
| private int enclosingMethodOwner; |
| |
| /** |
| * The constant pool item that contains the name and descriptor of the |
| * enclosing method of this class. |
| */ |
| private int enclosingMethod; |
| |
| /** |
| * The runtime visible annotations of this class. |
| */ |
| private AnnotationWriter anns; |
| |
| /** |
| * The runtime invisible annotations of this class. |
| */ |
| private AnnotationWriter ianns; |
| |
| /** |
| * The runtime visible type annotations of this class. |
| */ |
| private AnnotationWriter tanns; |
| |
| /** |
| * The runtime invisible type annotations of this class. |
| */ |
| private AnnotationWriter itanns; |
| |
| /** |
| * The non standard attributes of this class. |
| */ |
| private Attribute attrs; |
| |
| /** |
| * The number of entries in the InnerClasses attribute. |
| */ |
| private int innerClassesCount; |
| |
| /** |
| * The InnerClasses attribute. |
| */ |
| private ByteVector innerClasses; |
| |
| /** |
| * The number of entries in the BootstrapMethods attribute. |
| */ |
| int bootstrapMethodsCount; |
| |
| /** |
| * The BootstrapMethods attribute. |
| */ |
| ByteVector bootstrapMethods; |
| |
| /** |
| * The fields of this class. These fields are stored in a linked list of |
| * {@link FieldWriter} objects, linked to each other by their |
| * {@link FieldWriter#fv} field. This field stores the first element of this |
| * list. |
| */ |
| FieldWriter firstField; |
| |
| /** |
| * The fields of this class. These fields are stored in a linked list of |
| * {@link FieldWriter} objects, linked to each other by their |
| * {@link FieldWriter#fv} field. This field stores the last element of this |
| * list. |
| */ |
| FieldWriter lastField; |
| |
| /** |
| * The methods of this class. These methods are stored in a linked list of |
| * {@link MethodWriter} objects, linked to each other by their |
| * {@link MethodWriter#mv} field. This field stores the first element of |
| * this list. |
| */ |
| MethodWriter firstMethod; |
| |
| /** |
| * The methods of this class. These methods are stored in a linked list of |
| * {@link MethodWriter} objects, linked to each other by their |
| * {@link MethodWriter#mv} field. This field stores the last element of this |
| * list. |
| */ |
| MethodWriter lastMethod; |
| |
| /** |
| * <tt>true</tt> if the maximum stack size and number of local variables |
| * must be automatically computed. |
| */ |
| private boolean computeMaxs; |
| |
| /** |
| * <tt>true</tt> if the stack map frames must be recomputed from scratch. |
| */ |
| private boolean computeFrames; |
| |
| /** |
| * <tt>true</tt> if the stack map tables of this class are invalid. The |
| * {@link MethodWriter#resizeInstructions} method cannot transform existing |
| * stack map tables, and so produces potentially invalid classes when it is |
| * executed. In this case the class is reread and rewritten with the |
| * {@link #COMPUTE_FRAMES} option (the resizeInstructions method can resize |
| * stack map tables when this option is used). |
| */ |
| boolean invalidFrames; |
| |
| // ------------------------------------------------------------------------ |
| // Static initializer |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Computes the instruction types of JVM opcodes. |
| */ |
| static { |
| int i; |
| byte[] b = new byte[220]; |
| String s = "AAAAAAAAAAAAAAAABCLMMDDDDDEEEEEEEEEEEEEEEEEEEEAAAAAAAADD" |
| + "DDDEEEEEEEEEEEEEEEEEEEEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" |
| + "AAAAAAAAAAAAAAAAANAAAAAAAAAAAAAAAAAAAAJJJJJJJJJJJJJJJJDOPAA" |
| + "AAAAGGGGGGGHIFBFAAFFAARQJJKKJJJJJJJJJJJJJJJJJJ"; |
| for (i = 0; i < b.length; ++i) { |
| b[i] = (byte) (s.charAt(i) - 'A'); |
| } |
| TYPE = b; |
| |
| // code to generate the above string |
| // |
| // // SBYTE_INSN instructions |
| // b[Constants.NEWARRAY] = SBYTE_INSN; |
| // b[Constants.BIPUSH] = SBYTE_INSN; |
| // |
| // // SHORT_INSN instructions |
| // b[Constants.SIPUSH] = SHORT_INSN; |
| // |
| // // (IMPL)VAR_INSN instructions |
| // b[Constants.RET] = VAR_INSN; |
| // for (i = Constants.ILOAD; i <= Constants.ALOAD; ++i) { |
| // b[i] = VAR_INSN; |
| // } |
| // for (i = Constants.ISTORE; i <= Constants.ASTORE; ++i) { |
| // b[i] = VAR_INSN; |
| // } |
| // for (i = 26; i <= 45; ++i) { // ILOAD_0 to ALOAD_3 |
| // b[i] = IMPLVAR_INSN; |
| // } |
| // for (i = 59; i <= 78; ++i) { // ISTORE_0 to ASTORE_3 |
| // b[i] = IMPLVAR_INSN; |
| // } |
| // |
| // // TYPE_INSN instructions |
| // b[Constants.NEW] = TYPE_INSN; |
| // b[Constants.ANEWARRAY] = TYPE_INSN; |
| // b[Constants.CHECKCAST] = TYPE_INSN; |
| // b[Constants.INSTANCEOF] = TYPE_INSN; |
| // |
| // // (Set)FIELDORMETH_INSN instructions |
| // for (i = Constants.GETSTATIC; i <= Constants.INVOKESTATIC; ++i) { |
| // b[i] = FIELDORMETH_INSN; |
| // } |
| // b[Constants.INVOKEINTERFACE] = ITFMETH_INSN; |
| // b[Constants.INVOKEDYNAMIC] = INDYMETH_INSN; |
| // |
| // // LABEL(W)_INSN instructions |
| // for (i = Constants.IFEQ; i <= Constants.JSR; ++i) { |
| // b[i] = LABEL_INSN; |
| // } |
| // b[Constants.IFNULL] = LABEL_INSN; |
| // b[Constants.IFNONNULL] = LABEL_INSN; |
| // b[200] = LABELW_INSN; // GOTO_W |
| // b[201] = LABELW_INSN; // JSR_W |
| // // temporary opcodes used internally by ASM - see Label and |
| // MethodWriter |
| // for (i = 202; i < 220; ++i) { |
| // b[i] = LABEL_INSN; |
| // } |
| // |
| // // LDC(_W) instructions |
| // b[Constants.LDC] = LDC_INSN; |
| // b[19] = LDCW_INSN; // LDC_W |
| // b[20] = LDCW_INSN; // LDC2_W |
| // |
| // // special instructions |
| // b[Constants.IINC] = IINC_INSN; |
| // b[Constants.TABLESWITCH] = TABL_INSN; |
| // b[Constants.LOOKUPSWITCH] = LOOK_INSN; |
| // b[Constants.MULTIANEWARRAY] = MANA_INSN; |
| // b[196] = WIDE_INSN; // WIDE |
| // |
| // for (i = 0; i < b.length; ++i) { |
| // System.err.print((char)('A' + b[i])); |
| // } |
| // System.err.println(); |
| } |
| |
| // ------------------------------------------------------------------------ |
| // Constructor |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Constructs a new {@link ClassWriter} object. |
| * |
| * @param flags |
| * option flags that can be used to modify the default behavior |
| * of this class. See {@link #COMPUTE_MAXS}, |
| * {@link #COMPUTE_FRAMES}. |
| */ |
| public ClassWriter(final int flags) { |
| super(Opcodes.ASM6); |
| index = 1; |
| pool = new ByteVector(); |
| items = new Item[256]; |
| threshold = (int) (0.75d * items.length); |
| key = new Item(); |
| key2 = new Item(); |
| key3 = new Item(); |
| key4 = new Item(); |
| this.computeMaxs = (flags & COMPUTE_MAXS) != 0; |
| this.computeFrames = (flags & COMPUTE_FRAMES) != 0; |
| } |
| |
| /** |
| * Constructs a new {@link ClassWriter} object and enables optimizations for |
| * "mostly add" bytecode transformations. These optimizations are the |
| * following: |
| * |
| * <ul> |
| * <li>The constant pool from the original class is copied as is in the new |
| * class, which saves time. New constant pool entries will be added at the |
| * end if necessary, but unused constant pool entries <i>won't be |
| * removed</i>.</li> |
| * <li>Methods that are not transformed are copied as is in the new class, |
| * directly from the original class bytecode (i.e. without emitting visit |
| * events for all the method instructions), which saves a <i>lot</i> of |
| * time. Untransformed methods are detected by the fact that the |
| * {@link ClassReader} receives {@link MethodVisitor} objects that come from |
| * a {@link ClassWriter} (and not from any other {@link ClassVisitor} |
| * instance).</li> |
| * </ul> |
| * |
| * @param classReader |
| * the {@link ClassReader} used to read the original class. It |
| * will be used to copy the entire constant pool from the |
| * original class and also to copy other fragments of original |
| * bytecode where applicable. |
| * @param flags |
| * option flags that can be used to modify the default behavior |
| * of this class. <i>These option flags do not affect methods |
| * that are copied as is in the new class. This means that |
| * neither the maximum stack size nor the stack frames will be |
| * computed for these methods</i>. See {@link #COMPUTE_MAXS}, |
| * {@link #COMPUTE_FRAMES}. |
| */ |
| public ClassWriter(final ClassReader classReader, final int flags) { |
| this(flags); |
| classReader.copyPool(this); |
| this.cr = classReader; |
| } |
| |
| // ------------------------------------------------------------------------ |
| // Implementation of the ClassVisitor abstract class |
| // ------------------------------------------------------------------------ |
| |
| @Override |
| public final void visit(final int version, final int access, |
| final String name, final String signature, final String superName, |
| final String[] interfaces) { |
| this.version = version; |
| this.access = access; |
| this.name = newClass(name); |
| thisName = name; |
| if (ClassReader.SIGNATURES && signature != null) { |
| this.signature = newUTF8(signature); |
| } |
| this.superName = superName == null ? 0 : newClass(superName); |
| if (interfaces != null && interfaces.length > 0) { |
| interfaceCount = interfaces.length; |
| this.interfaces = new int[interfaceCount]; |
| for (int i = 0; i < interfaceCount; ++i) { |
| this.interfaces[i] = newClass(interfaces[i]); |
| } |
| } |
| } |
| |
| @Override |
| public final void visitSource(final String file, final String debug) { |
| if (file != null) { |
| sourceFile = newUTF8(file); |
| } |
| if (debug != null) { |
| sourceDebug = new ByteVector().encodeUTF8(debug, 0, |
| Integer.MAX_VALUE); |
| } |
| } |
| |
| @Override |
| public final ModuleVisitor visitModule() { |
| return moduleWriter = new ModuleWriter(this); |
| } |
| |
| @Override |
| public final void visitOuterClass(final String owner, final String name, |
| final String desc) { |
| enclosingMethodOwner = newClass(owner); |
| if (name != null && desc != null) { |
| enclosingMethod = newNameType(name, desc); |
| } |
| } |
| |
| @Override |
| public final AnnotationVisitor visitAnnotation(final String desc, |
| final boolean visible) { |
| if (!ClassReader.ANNOTATIONS) { |
| return null; |
| } |
| ByteVector bv = new ByteVector(); |
| // write type, and reserve space for values count |
| bv.putShort(newUTF8(desc)).putShort(0); |
| AnnotationWriter aw = new AnnotationWriter(this, true, bv, bv, 2); |
| if (visible) { |
| aw.next = anns; |
| anns = aw; |
| } else { |
| aw.next = ianns; |
| ianns = aw; |
| } |
| return aw; |
| } |
| |
| @Override |
| public final AnnotationVisitor visitTypeAnnotation(int typeRef, |
| TypePath typePath, final String desc, final boolean visible) { |
| if (!ClassReader.ANNOTATIONS) { |
| return null; |
| } |
| ByteVector bv = new ByteVector(); |
| // write target_type and target_info |
| AnnotationWriter.putTarget(typeRef, typePath, bv); |
| // write type, and reserve space for values count |
| bv.putShort(newUTF8(desc)).putShort(0); |
| AnnotationWriter aw = new AnnotationWriter(this, true, bv, bv, |
| bv.length - 2); |
| if (visible) { |
| aw.next = tanns; |
| tanns = aw; |
| } else { |
| aw.next = itanns; |
| itanns = aw; |
| } |
| return aw; |
| } |
| |
| @Override |
| public final void visitAttribute(final Attribute attr) { |
| attr.next = attrs; |
| attrs = attr; |
| } |
| |
| @Override |
| public final void visitInnerClass(final String name, |
| final String outerName, final String innerName, final int access) { |
| if (innerClasses == null) { |
| innerClasses = new ByteVector(); |
| } |
| // Sec. 4.7.6 of the JVMS states "Every CONSTANT_Class_info entry in the |
| // constant_pool table which represents a class or interface C that is |
| // not a package member must have exactly one corresponding entry in the |
| // classes array". To avoid duplicates we keep track in the intVal field |
| // of the Item of each CONSTANT_Class_info entry C whether an inner |
| // class entry has already been added for C (this field is unused for |
| // class entries, and changing its value does not change the hashcode |
| // and equality tests). If so we store the index of this inner class |
| // entry (plus one) in intVal. This hack allows duplicate detection in |
| // O(1) time. |
| Item nameItem = newClassItem(name); |
| if (nameItem.intVal == 0) { |
| ++innerClassesCount; |
| innerClasses.putShort(nameItem.index); |
| innerClasses.putShort(outerName == null ? 0 : newClass(outerName)); |
| innerClasses.putShort(innerName == null ? 0 : newUTF8(innerName)); |
| innerClasses.putShort(access); |
| nameItem.intVal = innerClassesCount; |
| } else { |
| // Compare the inner classes entry nameItem.intVal - 1 with the |
| // arguments of this method and throw an exception if there is a |
| // difference? |
| } |
| } |
| |
| @Override |
| public final FieldVisitor visitField(final int access, final String name, |
| final String desc, final String signature, final Object value) { |
| return new FieldWriter(this, access, name, desc, signature, value); |
| } |
| |
| @Override |
| public final MethodVisitor visitMethod(final int access, final String name, |
| final String desc, final String signature, final String[] exceptions) { |
| return new MethodWriter(this, access, name, desc, signature, |
| exceptions, computeMaxs, computeFrames); |
| } |
| |
| @Override |
| public final void visitEnd() { |
| } |
| |
| // ------------------------------------------------------------------------ |
| // Other public methods |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Returns the bytecode of the class that was build with this class writer. |
| * |
| * @return the bytecode of the class that was build with this class writer. |
| */ |
| public byte[] toByteArray() { |
| if (index > 0xFFFF) { |
| throw new RuntimeException("Class file too large!"); |
| } |
| // computes the real size of the bytecode of this class |
| int size = 24 + 2 * interfaceCount; |
| int nbFields = 0; |
| FieldWriter fb = firstField; |
| while (fb != null) { |
| ++nbFields; |
| size += fb.getSize(); |
| fb = (FieldWriter) fb.fv; |
| } |
| int nbMethods = 0; |
| MethodWriter mb = firstMethod; |
| while (mb != null) { |
| ++nbMethods; |
| size += mb.getSize(); |
| mb = (MethodWriter) mb.mv; |
| } |
| int attributeCount = 0; |
| if (bootstrapMethods != null) { |
| // we put it as first attribute in order to improve a bit |
| // ClassReader.copyBootstrapMethods |
| ++attributeCount; |
| size += 8 + bootstrapMethods.length; |
| newUTF8("BootstrapMethods"); |
| } |
| if (ClassReader.SIGNATURES && signature != 0) { |
| ++attributeCount; |
| size += 8; |
| newUTF8("Signature"); |
| } |
| if (sourceFile != 0) { |
| ++attributeCount; |
| size += 8; |
| newUTF8("SourceFile"); |
| } |
| if (sourceDebug != null) { |
| ++attributeCount; |
| size += sourceDebug.length + 6; |
| newUTF8("SourceDebugExtension"); |
| } |
| if (enclosingMethodOwner != 0) { |
| ++attributeCount; |
| size += 10; |
| newUTF8("EnclosingMethod"); |
| } |
| if ((access & Opcodes.ACC_DEPRECATED) != 0) { |
| ++attributeCount; |
| size += 6; |
| newUTF8("Deprecated"); |
| } |
| if ((access & Opcodes.ACC_SYNTHETIC) != 0) { |
| if ((version & 0xFFFF) < Opcodes.V1_5 |
| || (access & ACC_SYNTHETIC_ATTRIBUTE) != 0) { |
| ++attributeCount; |
| size += 6; |
| newUTF8("Synthetic"); |
| } |
| } |
| if (innerClasses != null) { |
| ++attributeCount; |
| size += 8 + innerClasses.length; |
| newUTF8("InnerClasses"); |
| } |
| if (ClassReader.ANNOTATIONS && anns != null) { |
| ++attributeCount; |
| size += 8 + anns.getSize(); |
| newUTF8("RuntimeVisibleAnnotations"); |
| } |
| if (ClassReader.ANNOTATIONS && ianns != null) { |
| ++attributeCount; |
| size += 8 + ianns.getSize(); |
| newUTF8("RuntimeInvisibleAnnotations"); |
| } |
| if (ClassReader.ANNOTATIONS && tanns != null) { |
| ++attributeCount; |
| size += 8 + tanns.getSize(); |
| newUTF8("RuntimeVisibleTypeAnnotations"); |
| } |
| if (ClassReader.ANNOTATIONS && itanns != null) { |
| ++attributeCount; |
| size += 8 + itanns.getSize(); |
| newUTF8("RuntimeInvisibleTypeAnnotations"); |
| } |
| if (moduleWriter != null) { |
| ++attributeCount; |
| size += 6 + moduleWriter.getSize(); |
| newUTF8("Module"); |
| } |
| if (attrs != null) { |
| attributeCount += attrs.getCount(); |
| size += attrs.getSize(this, null, 0, -1, -1); |
| } |
| size += pool.length; |
| // allocates a byte vector of this size, in order to avoid unnecessary |
| // arraycopy operations in the ByteVector.enlarge() method |
| ByteVector out = new ByteVector(size); |
| out.putInt(0xCAFEBABE).putInt(version); |
| out.putShort(index).putByteArray(pool.data, 0, pool.length); |
| int mask = Opcodes.ACC_DEPRECATED | ACC_SYNTHETIC_ATTRIBUTE |
| | ((access & ACC_SYNTHETIC_ATTRIBUTE) / TO_ACC_SYNTHETIC); |
| out.putShort(access & ~mask).putShort(name).putShort(superName); |
| out.putShort(interfaceCount); |
| for (int i = 0; i < interfaceCount; ++i) { |
| out.putShort(interfaces[i]); |
| } |
| out.putShort(nbFields); |
| fb = firstField; |
| while (fb != null) { |
| fb.put(out); |
| fb = (FieldWriter) fb.fv; |
| } |
| out.putShort(nbMethods); |
| mb = firstMethod; |
| while (mb != null) { |
| mb.put(out); |
| mb = (MethodWriter) mb.mv; |
| } |
| out.putShort(attributeCount); |
| if (bootstrapMethods != null) { |
| out.putShort(newUTF8("BootstrapMethods")); |
| out.putInt(bootstrapMethods.length + 2).putShort( |
| bootstrapMethodsCount); |
| out.putByteArray(bootstrapMethods.data, 0, bootstrapMethods.length); |
| } |
| if (ClassReader.SIGNATURES && signature != 0) { |
| out.putShort(newUTF8("Signature")).putInt(2).putShort(signature); |
| } |
| if (sourceFile != 0) { |
| out.putShort(newUTF8("SourceFile")).putInt(2).putShort(sourceFile); |
| } |
| if (sourceDebug != null) { |
| int len = sourceDebug.length; |
| out.putShort(newUTF8("SourceDebugExtension")).putInt(len); |
| out.putByteArray(sourceDebug.data, 0, len); |
| } |
| if (moduleWriter != null) { |
| out.putShort(newUTF8("Module")); |
| moduleWriter.put(out); |
| } |
| if (enclosingMethodOwner != 0) { |
| out.putShort(newUTF8("EnclosingMethod")).putInt(4); |
| out.putShort(enclosingMethodOwner).putShort(enclosingMethod); |
| } |
| if ((access & Opcodes.ACC_DEPRECATED) != 0) { |
| out.putShort(newUTF8("Deprecated")).putInt(0); |
| } |
| if ((access & Opcodes.ACC_SYNTHETIC) != 0) { |
| if ((version & 0xFFFF) < Opcodes.V1_5 |
| || (access & ACC_SYNTHETIC_ATTRIBUTE) != 0) { |
| out.putShort(newUTF8("Synthetic")).putInt(0); |
| } |
| } |
| if (innerClasses != null) { |
| out.putShort(newUTF8("InnerClasses")); |
| out.putInt(innerClasses.length + 2).putShort(innerClassesCount); |
| out.putByteArray(innerClasses.data, 0, innerClasses.length); |
| } |
| if (ClassReader.ANNOTATIONS && anns != null) { |
| out.putShort(newUTF8("RuntimeVisibleAnnotations")); |
| anns.put(out); |
| } |
| if (ClassReader.ANNOTATIONS && ianns != null) { |
| out.putShort(newUTF8("RuntimeInvisibleAnnotations")); |
| ianns.put(out); |
| } |
| if (ClassReader.ANNOTATIONS && tanns != null) { |
| out.putShort(newUTF8("RuntimeVisibleTypeAnnotations")); |
| tanns.put(out); |
| } |
| if (ClassReader.ANNOTATIONS && itanns != null) { |
| out.putShort(newUTF8("RuntimeInvisibleTypeAnnotations")); |
| itanns.put(out); |
| } |
| if (attrs != null) { |
| attrs.put(this, null, 0, -1, -1, out); |
| } |
| if (invalidFrames) { |
| anns = null; |
| ianns = null; |
| attrs = null; |
| moduleWriter = null; |
| innerClassesCount = 0; |
| innerClasses = null; |
| bootstrapMethodsCount = 0; |
| bootstrapMethods = null; |
| firstField = null; |
| lastField = null; |
| firstMethod = null; |
| lastMethod = null; |
| computeMaxs = false; |
| computeFrames = true; |
| invalidFrames = false; |
| new ClassReader(out.data).accept(this, ClassReader.SKIP_FRAMES); |
| return toByteArray(); |
| } |
| return out.data; |
| } |
| |
| // ------------------------------------------------------------------------ |
| // Utility methods: constant pool management |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Adds a number or string constant to the constant pool of the class being |
| * build. Does nothing if the constant pool already contains a similar item. |
| * |
| * @param cst |
| * the value of the constant to be added to the constant pool. |
| * This parameter must be an {@link Integer}, a {@link Float}, a |
| * {@link Long}, a {@link Double}, a {@link String} or a |
| * {@link Type}. |
| * @return a new or already existing constant item with the given value. |
| */ |
| Item newConstItem(final Object cst) { |
| if (cst instanceof Integer) { |
| int val = ((Integer) cst).intValue(); |
| return newInteger(val); |
| } else if (cst instanceof Byte) { |
| int val = ((Byte) cst).intValue(); |
| return newInteger(val); |
| } else if (cst instanceof Character) { |
| int val = ((Character) cst).charValue(); |
| return newInteger(val); |
| } else if (cst instanceof Short) { |
| int val = ((Short) cst).intValue(); |
| return newInteger(val); |
| } else if (cst instanceof Boolean) { |
| int val = ((Boolean) cst).booleanValue() ? 1 : 0; |
| return newInteger(val); |
| } else if (cst instanceof Float) { |
| float val = ((Float) cst).floatValue(); |
| return newFloat(val); |
| } else if (cst instanceof Long) { |
| long val = ((Long) cst).longValue(); |
| return newLong(val); |
| } else if (cst instanceof Double) { |
| double val = ((Double) cst).doubleValue(); |
| return newDouble(val); |
| } else if (cst instanceof String) { |
| return newString((String) cst); |
| } else if (cst instanceof Type) { |
| Type t = (Type) cst; |
| int s = t.getSort(); |
| if (s == Type.OBJECT) { |
| return newClassItem(t.getInternalName()); |
| } else if (s == Type.METHOD) { |
| return newMethodTypeItem(t.getDescriptor()); |
| } else { // s == primitive type or array |
| return newClassItem(t.getDescriptor()); |
| } |
| } else if (cst instanceof Handle) { |
| Handle h = (Handle) cst; |
| return newHandleItem(h.tag, h.owner, h.name, h.desc, h.itf); |
| } else { |
| throw new IllegalArgumentException("value " + cst); |
| } |
| } |
| |
| /** |
| * Adds a number or string constant to the constant pool of the class being |
| * build. Does nothing if the constant pool already contains a similar item. |
| * <i>This method is intended for {@link Attribute} sub classes, and is |
| * normally not needed by class generators or adapters.</i> |
| * |
| * @param cst |
| * the value of the constant to be added to the constant pool. |
| * This parameter must be an {@link Integer}, a {@link Float}, a |
| * {@link Long}, a {@link Double} or a {@link String}. |
| * @return the index of a new or already existing constant item with the |
| * given value. |
| */ |
| public int newConst(final Object cst) { |
| return newConstItem(cst).index; |
| } |
| |
| /** |
| * Adds an UTF8 string to the constant pool of the class being build. Does |
| * nothing if the constant pool already contains a similar item. <i>This |
| * method is intended for {@link Attribute} sub classes, and is normally not |
| * needed by class generators or adapters.</i> |
| * |
| * @param value |
| * the String value. |
| * @return the index of a new or already existing UTF8 item. |
| */ |
| public int newUTF8(final String value) { |
| key.set(UTF8, value, null, null); |
| Item result = get(key); |
| if (result == null) { |
| pool.putByte(UTF8).putUTF8(value); |
| result = new Item(index++, key); |
| put(result); |
| } |
| return result.index; |
| } |
| |
| /** |
| * Adds a class reference to the constant pool of the class being build. |
| * Does nothing if the constant pool already contains a similar item. |
| * <i>This method is intended for {@link Attribute} sub classes, and is |
| * normally not needed by class generators or adapters.</i> |
| * |
| * @param value |
| * the internal name of the class. |
| * @return a new or already existing class reference item. |
| */ |
| Item newClassItem(final String value) { |
| key2.set(CLASS, value, null, null); |
| Item result = get(key2); |
| if (result == null) { |
| pool.put12(CLASS, newUTF8(value)); |
| result = new Item(index++, key2); |
| put(result); |
| } |
| return result; |
| } |
| |
| /** |
| * Adds a class reference to the constant pool of the class being build. |
| * Does nothing if the constant pool already contains a similar item. |
| * <i>This method is intended for {@link Attribute} sub classes, and is |
| * normally not needed by class generators or adapters.</i> |
| * |
| * @param value |
| * the internal name of the class. |
| * @return the index of a new or already existing class reference item. |
| */ |
| public int newClass(final String value) { |
| return newClassItem(value).index; |
| } |
| |
| /** |
| * Adds a method type reference to the constant pool of the class being |
| * build. Does nothing if the constant pool already contains a similar item. |
| * <i>This method is intended for {@link Attribute} sub classes, and is |
| * normally not needed by class generators or adapters.</i> |
| * |
| * @param methodDesc |
| * method descriptor of the method type. |
| * @return a new or already existing method type reference item. |
| */ |
| Item newMethodTypeItem(final String methodDesc) { |
| key2.set(MTYPE, methodDesc, null, null); |
| Item result = get(key2); |
| if (result == null) { |
| pool.put12(MTYPE, newUTF8(methodDesc)); |
| result = new Item(index++, key2); |
| put(result); |
| } |
| return result; |
| } |
| |
| /** |
| * Adds a method type reference to the constant pool of the class being |
| * build. Does nothing if the constant pool already contains a similar item. |
| * <i>This method is intended for {@link Attribute} sub classes, and is |
| * normally not needed by class generators or adapters.</i> |
| * |
| * @param methodDesc |
| * method descriptor of the method type. |
| * @return the index of a new or already existing method type reference |
| * item. |
| */ |
| public int newMethodType(final String methodDesc) { |
| return newMethodTypeItem(methodDesc).index; |
| } |
| |
| /** |
| * Adds a handle to the constant pool of the class being build. Does nothing |
| * if the constant pool already contains a similar item. <i>This method is |
| * intended for {@link Attribute} sub classes, and is normally not needed by |
| * class generators or adapters.</i> |
| * |
| * @param tag |
| * the kind of this handle. Must be {@link Opcodes#H_GETFIELD}, |
| * {@link Opcodes#H_GETSTATIC}, {@link Opcodes#H_PUTFIELD}, |
| * {@link Opcodes#H_PUTSTATIC}, {@link Opcodes#H_INVOKEVIRTUAL}, |
| * {@link Opcodes#H_INVOKESTATIC}, |
| * {@link Opcodes#H_INVOKESPECIAL}, |
| * {@link Opcodes#H_NEWINVOKESPECIAL} or |
| * {@link Opcodes#H_INVOKEINTERFACE}. |
| * @param owner |
| * the internal name of the field or method owner class. |
| * @param name |
| * the name of the field or method. |
| * @param desc |
| * the descriptor of the field or method. |
| * @param itf |
| * true if the owner is an interface. |
| * @return a new or an already existing method type reference item. |
| */ |
| Item newHandleItem(final int tag, final String owner, final String name, |
| final String desc, final boolean itf) { |
| key4.set(HANDLE_BASE + tag, owner, name, desc); |
| Item result = get(key4); |
| if (result == null) { |
| if (tag <= Opcodes.H_PUTSTATIC) { |
| put112(HANDLE, tag, newField(owner, name, desc)); |
| } else { |
| put112(HANDLE, |
| tag, |
| newMethod(owner, name, desc, itf)); |
| } |
| result = new Item(index++, key4); |
| put(result); |
| } |
| return result; |
| } |
| |
| /** |
| * Adds a handle to the constant pool of the class being build. Does nothing |
| * if the constant pool already contains a similar item. <i>This method is |
| * intended for {@link Attribute} sub classes, and is normally not needed by |
| * class generators or adapters.</i> |
| * |
| * @param tag |
| * the kind of this handle. Must be {@link Opcodes#H_GETFIELD}, |
| * {@link Opcodes#H_GETSTATIC}, {@link Opcodes#H_PUTFIELD}, |
| * {@link Opcodes#H_PUTSTATIC}, {@link Opcodes#H_INVOKEVIRTUAL}, |
| * {@link Opcodes#H_INVOKESTATIC}, |
| * {@link Opcodes#H_INVOKESPECIAL}, |
| * {@link Opcodes#H_NEWINVOKESPECIAL} or |
| * {@link Opcodes#H_INVOKEINTERFACE}. |
| * @param owner |
| * the internal name of the field or method owner class. |
| * @param name |
| * the name of the field or method. |
| * @param desc |
| * the descriptor of the field or method. |
| * @return the index of a new or already existing method type reference |
| * item. |
| * |
| * @deprecated this method is superseded by |
| * {@link #newHandle(int, String, String, String, boolean)}. |
| */ |
| @Deprecated |
| public int newHandle(final int tag, final String owner, final String name, |
| final String desc) { |
| return newHandle(tag, owner, name, desc, tag == Opcodes.H_INVOKEINTERFACE); |
| } |
| |
| /** |
| * Adds a handle to the constant pool of the class being build. Does nothing |
| * if the constant pool already contains a similar item. <i>This method is |
| * intended for {@link Attribute} sub classes, and is normally not needed by |
| * class generators or adapters.</i> |
| * |
| * @param tag |
| * the kind of this handle. Must be {@link Opcodes#H_GETFIELD}, |
| * {@link Opcodes#H_GETSTATIC}, {@link Opcodes#H_PUTFIELD}, |
| * {@link Opcodes#H_PUTSTATIC}, {@link Opcodes#H_INVOKEVIRTUAL}, |
| * {@link Opcodes#H_INVOKESTATIC}, |
| * {@link Opcodes#H_INVOKESPECIAL}, |
| * {@link Opcodes#H_NEWINVOKESPECIAL} or |
| * {@link Opcodes#H_INVOKEINTERFACE}. |
| * @param owner |
| * the internal name of the field or method owner class. |
| * @param name |
| * the name of the field or method. |
| * @param desc |
| * the descriptor of the field or method. |
| * @param itf |
| * true if the owner is an interface. |
| * @return the index of a new or already existing method type reference |
| * item. |
| */ |
| public int newHandle(final int tag, final String owner, final String name, |
| final String desc, final boolean itf) { |
| return newHandleItem(tag, owner, name, desc, itf).index; |
| } |
| |
| /** |
| * Adds an invokedynamic reference to the constant pool of the class being |
| * build. Does nothing if the constant pool already contains a similar item. |
| * <i>This method is intended for {@link Attribute} sub classes, and is |
| * normally not needed by class generators or adapters.</i> |
| * |
| * @param name |
| * name of the invoked method. |
| * @param desc |
| * descriptor of the invoke method. |
| * @param bsm |
| * the bootstrap method. |
| * @param bsmArgs |
| * the bootstrap method constant arguments. |
| * |
| * @return a new or an already existing invokedynamic type reference item. |
| */ |
| Item newInvokeDynamicItem(final String name, final String desc, |
| final Handle bsm, final Object... bsmArgs) { |
| // cache for performance |
| ByteVector bootstrapMethods = this.bootstrapMethods; |
| if (bootstrapMethods == null) { |
| bootstrapMethods = this.bootstrapMethods = new ByteVector(); |
| } |
| |
| int position = bootstrapMethods.length; // record current position |
| |
| int hashCode = bsm.hashCode(); |
| bootstrapMethods.putShort(newHandle(bsm.tag, bsm.owner, bsm.name, |
| bsm.desc, bsm.isInterface())); |
| |
| int argsLength = bsmArgs.length; |
| bootstrapMethods.putShort(argsLength); |
| |
| for (int i = 0; i < argsLength; i++) { |
| Object bsmArg = bsmArgs[i]; |
| hashCode ^= bsmArg.hashCode(); |
| bootstrapMethods.putShort(newConst(bsmArg)); |
| } |
| |
| byte[] data = bootstrapMethods.data; |
| int length = (1 + 1 + argsLength) << 1; // (bsm + argCount + arguments) |
| hashCode &= 0x7FFFFFFF; |
| Item result = items[hashCode % items.length]; |
| loop: while (result != null) { |
| if (result.type != BSM || result.hashCode != hashCode) { |
| result = result.next; |
| continue; |
| } |
| |
| // because the data encode the size of the argument |
| // we don't need to test if these size are equals |
| int resultPosition = result.intVal; |
| for (int p = 0; p < length; p++) { |
| if (data[position + p] != data[resultPosition + p]) { |
| result = result.next; |
| continue loop; |
| } |
| } |
| break; |
| } |
| |
| int bootstrapMethodIndex; |
| if (result != null) { |
| bootstrapMethodIndex = result.index; |
| bootstrapMethods.length = position; // revert to old position |
| } else { |
| bootstrapMethodIndex = bootstrapMethodsCount++; |
| result = new Item(bootstrapMethodIndex); |
| result.set(position, hashCode); |
| put(result); |
| } |
| |
| // now, create the InvokeDynamic constant |
| key3.set(name, desc, bootstrapMethodIndex); |
| result = get(key3); |
| if (result == null) { |
| put122(INDY, bootstrapMethodIndex, newNameType(name, desc)); |
| result = new Item(index++, key3); |
| put(result); |
| } |
| return result; |
| } |
| |
| /** |
| * Adds an invokedynamic reference to the constant pool of the class being |
| * build. Does nothing if the constant pool already contains a similar item. |
| * <i>This method is intended for {@link Attribute} sub classes, and is |
| * normally not needed by class generators or adapters.</i> |
| * |
| * @param name |
| * name of the invoked method. |
| * @param desc |
| * descriptor of the invoke method. |
| * @param bsm |
| * the bootstrap method. |
| * @param bsmArgs |
| * the bootstrap method constant arguments. |
| * |
| * @return the index of a new or already existing invokedynamic reference |
| * item. |
| */ |
| public int newInvokeDynamic(final String name, final String desc, |
| final Handle bsm, final Object... bsmArgs) { |
| return newInvokeDynamicItem(name, desc, bsm, bsmArgs).index; |
| } |
| |
| /** |
| * Adds a field reference to the constant pool of the class being build. |
| * Does nothing if the constant pool already contains a similar item. |
| * |
| * @param owner |
| * the internal name of the field's owner class. |
| * @param name |
| * the field's name. |
| * @param desc |
| * the field's descriptor. |
| * @return a new or already existing field reference item. |
| */ |
| Item newFieldItem(final String owner, final String name, final String desc) { |
| key3.set(FIELD, owner, name, desc); |
| Item result = get(key3); |
| if (result == null) { |
| put122(FIELD, newClass(owner), newNameType(name, desc)); |
| result = new Item(index++, key3); |
| put(result); |
| } |
| return result; |
| } |
| |
| /** |
| * Adds a field reference to the constant pool of the class being build. |
| * Does nothing if the constant pool already contains a similar item. |
| * <i>This method is intended for {@link Attribute} sub classes, and is |
| * normally not needed by class generators or adapters.</i> |
| * |
| * @param owner |
| * the internal name of the field's owner class. |
| * @param name |
| * the field's name. |
| * @param desc |
| * the field's descriptor. |
| * @return the index of a new or already existing field reference item. |
| */ |
| public int newField(final String owner, final String name, final String desc) { |
| return newFieldItem(owner, name, desc).index; |
| } |
| |
| /** |
| * Adds a method reference to the constant pool of the class being build. |
| * Does nothing if the constant pool already contains a similar item. |
| * |
| * @param owner |
| * the internal name of the method's owner class. |
| * @param name |
| * the method's name. |
| * @param desc |
| * the method's descriptor. |
| * @param itf |
| * <tt>true</tt> if <tt>owner</tt> is an interface. |
| * @return a new or already existing method reference item. |
| */ |
| Item newMethodItem(final String owner, final String name, |
| final String desc, final boolean itf) { |
| int type = itf ? IMETH : METH; |
| key3.set(type, owner, name, desc); |
| Item result = get(key3); |
| if (result == null) { |
| put122(type, newClass(owner), newNameType(name, desc)); |
| result = new Item(index++, key3); |
| put(result); |
| } |
| return result; |
| } |
| |
| /** |
| * Adds a method reference to the constant pool of the class being build. |
| * Does nothing if the constant pool already contains a similar item. |
| * <i>This method is intended for {@link Attribute} sub classes, and is |
| * normally not needed by class generators or adapters.</i> |
| * |
| * @param owner |
| * the internal name of the method's owner class. |
| * @param name |
| * the method's name. |
| * @param desc |
| * the method's descriptor. |
| * @param itf |
| * <tt>true</tt> if <tt>owner</tt> is an interface. |
| * @return the index of a new or already existing method reference item. |
| */ |
| public int newMethod(final String owner, final String name, |
| final String desc, final boolean itf) { |
| return newMethodItem(owner, name, desc, itf).index; |
| } |
| |
| /** |
| * Adds an integer to the constant pool of the class being build. Does |
| * nothing if the constant pool already contains a similar item. |
| * |
| * @param value |
| * the int value. |
| * @return a new or already existing int item. |
| */ |
| Item newInteger(final int value) { |
| key.set(value); |
| Item result = get(key); |
| if (result == null) { |
| pool.putByte(INT).putInt(value); |
| result = new Item(index++, key); |
| put(result); |
| } |
| return result; |
| } |
| |
| /** |
| * Adds a float to the constant pool of the class being build. Does nothing |
| * if the constant pool already contains a similar item. |
| * |
| * @param value |
| * the float value. |
| * @return a new or already existing float item. |
| */ |
| Item newFloat(final float value) { |
| key.set(value); |
| Item result = get(key); |
| if (result == null) { |
| pool.putByte(FLOAT).putInt(key.intVal); |
| result = new Item(index++, key); |
| put(result); |
| } |
| return result; |
| } |
| |
| /** |
| * Adds a long to the constant pool of the class being build. Does nothing |
| * if the constant pool already contains a similar item. |
| * |
| * @param value |
| * the long value. |
| * @return a new or already existing long item. |
| */ |
| Item newLong(final long value) { |
| key.set(value); |
| Item result = get(key); |
| if (result == null) { |
| pool.putByte(LONG).putLong(value); |
| result = new Item(index, key); |
| index += 2; |
| put(result); |
| } |
| return result; |
| } |
| |
| /** |
| * Adds a double to the constant pool of the class being build. Does nothing |
| * if the constant pool already contains a similar item. |
| * |
| * @param value |
| * the double value. |
| * @return a new or already existing double item. |
| */ |
| Item newDouble(final double value) { |
| key.set(value); |
| Item result = get(key); |
| if (result == null) { |
| pool.putByte(DOUBLE).putLong(key.longVal); |
| result = new Item(index, key); |
| index += 2; |
| put(result); |
| } |
| return result; |
| } |
| |
| /** |
| * Adds a string to the constant pool of the class being build. Does nothing |
| * if the constant pool already contains a similar item. |
| * |
| * @param value |
| * the String value. |
| * @return a new or already existing string item. |
| */ |
| private Item newString(final String value) { |
| key2.set(STR, value, null, null); |
| Item result = get(key2); |
| if (result == null) { |
| pool.put12(STR, newUTF8(value)); |
| result = new Item(index++, key2); |
| put(result); |
| } |
| return result; |
| } |
| |
| /** |
| * Adds a name and type to the constant pool of the class being build. Does |
| * nothing if the constant pool already contains a similar item. <i>This |
| * method is intended for {@link Attribute} sub classes, and is normally not |
| * needed by class generators or adapters.</i> |
| * |
| * @param name |
| * a name. |
| * @param desc |
| * a type descriptor. |
| * @return the index of a new or already existing name and type item. |
| */ |
| public int newNameType(final String name, final String desc) { |
| return newNameTypeItem(name, desc).index; |
| } |
| |
| /** |
| * Adds a name and type to the constant pool of the class being build. Does |
| * nothing if the constant pool already contains a similar item. |
| * |
| * @param name |
| * a name. |
| * @param desc |
| * a type descriptor. |
| * @return a new or already existing name and type item. |
| */ |
| Item newNameTypeItem(final String name, final String desc) { |
| key2.set(NAME_TYPE, name, desc, null); |
| Item result = get(key2); |
| if (result == null) { |
| put122(NAME_TYPE, newUTF8(name), newUTF8(desc)); |
| result = new Item(index++, key2); |
| put(result); |
| } |
| return result; |
| } |
| |
| /** |
| * Adds the given internal name to {@link #typeTable} and returns its index. |
| * Does nothing if the type table already contains this internal name. |
| * |
| * @param type |
| * the internal name to be added to the type table. |
| * @return the index of this internal name in the type table. |
| */ |
| int addType(final String type) { |
| key.set(TYPE_NORMAL, type, null, null); |
| Item result = get(key); |
| if (result == null) { |
| result = addType(key); |
| } |
| return result.index; |
| } |
| |
| /** |
| * Adds the given "uninitialized" type to {@link #typeTable} and returns its |
| * index. This method is used for UNINITIALIZED types, made of an internal |
| * name and a bytecode offset. |
| * |
| * @param type |
| * the internal name to be added to the type table. |
| * @param offset |
| * the bytecode offset of the NEW instruction that created this |
| * UNINITIALIZED type value. |
| * @return the index of this internal name in the type table. |
| */ |
| int addUninitializedType(final String type, final int offset) { |
| key.type = TYPE_UNINIT; |
| key.intVal = offset; |
| key.strVal1 = type; |
| key.hashCode = 0x7FFFFFFF & (TYPE_UNINIT + type.hashCode() + offset); |
| Item result = get(key); |
| if (result == null) { |
| result = addType(key); |
| } |
| return result.index; |
| } |
| |
| /** |
| * Adds the given Item to {@link #typeTable}. |
| * |
| * @param item |
| * the value to be added to the type table. |
| * @return the added Item, which a new Item instance with the same value as |
| * the given Item. |
| */ |
| private Item addType(final Item item) { |
| ++typeCount; |
| Item result = new Item(typeCount, key); |
| put(result); |
| if (typeTable == null) { |
| typeTable = new Item[16]; |
| } |
| if (typeCount == typeTable.length) { |
| Item[] newTable = new Item[2 * typeTable.length]; |
| System.arraycopy(typeTable, 0, newTable, 0, typeTable.length); |
| typeTable = newTable; |
| } |
| typeTable[typeCount] = result; |
| return result; |
| } |
| |
| /** |
| * Returns the index of the common super type of the two given types. This |
| * method calls {@link #getCommonSuperClass} and caches the result in the |
| * {@link #items} hash table to speedup future calls with the same |
| * parameters. |
| * |
| * @param type1 |
| * index of an internal name in {@link #typeTable}. |
| * @param type2 |
| * index of an internal name in {@link #typeTable}. |
| * @return the index of the common super type of the two given types. |
| */ |
| int getMergedType(final int type1, final int type2) { |
| key2.type = TYPE_MERGED; |
| key2.longVal = type1 | (((long) type2) << 32); |
| key2.hashCode = 0x7FFFFFFF & (TYPE_MERGED + type1 + type2); |
| Item result = get(key2); |
| if (result == null) { |
| String t = typeTable[type1].strVal1; |
| String u = typeTable[type2].strVal1; |
| key2.intVal = addType(getCommonSuperClass(t, u)); |
| result = new Item((short) 0, key2); |
| put(result); |
| } |
| return result.intVal; |
| } |
| |
| /** |
| * Returns the common super type of the two given types. The default |
| * implementation of this method <i>loads</i> the two given classes and uses |
| * the java.lang.Class methods to find the common super class. It can be |
| * overridden to compute this common super type in other ways, in particular |
| * without actually loading any class, or to take into account the class |
| * that is currently being generated by this ClassWriter, which can of |
| * course not be loaded since it is under construction. |
| * |
| * @param type1 |
| * the internal name of a class. |
| * @param type2 |
| * the internal name of another class. |
| * @return the internal name of the common super class of the two given |
| * classes. |
| */ |
| protected String getCommonSuperClass(final String type1, final String type2) { |
| Class<?> c, d; |
| ClassLoader classLoader = getClass().getClassLoader(); |
| try { |
| c = Class.forName(type1.replace('/', '.'), false, classLoader); |
| d = Class.forName(type2.replace('/', '.'), false, classLoader); |
| } catch (Exception e) { |
| throw new RuntimeException(e.toString()); |
| } |
| if (c.isAssignableFrom(d)) { |
| return type1; |
| } |
| if (d.isAssignableFrom(c)) { |
| return type2; |
| } |
| if (c.isInterface() || d.isInterface()) { |
| return "java/lang/Object"; |
| } else { |
| do { |
| c = c.getSuperclass(); |
| } while (!c.isAssignableFrom(d)); |
| return c.getName().replace('.', '/'); |
| } |
| } |
| |
| /** |
| * Returns the constant pool's hash table item which is equal to the given |
| * item. |
| * |
| * @param key |
| * a constant pool item. |
| * @return the constant pool's hash table item which is equal to the given |
| * item, or <tt>null</tt> if there is no such item. |
| */ |
| private Item get(final Item key) { |
| Item i = items[key.hashCode % items.length]; |
| while (i != null && (i.type != key.type || !key.isEqualTo(i))) { |
| i = i.next; |
| } |
| return i; |
| } |
| |
| /** |
| * Puts the given item in the constant pool's hash table. The hash table |
| * <i>must</i> not already contains this item. |
| * |
| * @param i |
| * the item to be added to the constant pool's hash table. |
| */ |
| private void put(final Item i) { |
| if (index + typeCount > threshold) { |
| int ll = items.length; |
| int nl = ll * 2 + 1; |
| Item[] newItems = new Item[nl]; |
| for (int l = ll - 1; l >= 0; --l) { |
| Item j = items[l]; |
| while (j != null) { |
| int index = j.hashCode % newItems.length; |
| Item k = j.next; |
| j.next = newItems[index]; |
| newItems[index] = j; |
| j = k; |
| } |
| } |
| items = newItems; |
| threshold = (int) (nl * 0.75); |
| } |
| int index = i.hashCode % items.length; |
| i.next = items[index]; |
| items[index] = i; |
| } |
| |
| /** |
| * Puts one byte and two shorts into the constant pool. |
| * |
| * @param b |
| * a byte. |
| * @param s1 |
| * a short. |
| * @param s2 |
| * another short. |
| */ |
| private void put122(final int b, final int s1, final int s2) { |
| pool.put12(b, s1).putShort(s2); |
| } |
| |
| /** |
| * Puts two bytes and one short into the constant pool. |
| * |
| * @param b1 |
| * a byte. |
| * @param b2 |
| * another byte. |
| * @param s |
| * a short. |
| */ |
| private void put112(final int b1, final int b2, final int s) { |
| pool.put11(b1, b2).putShort(s); |
| } |
| } |
