--- a/langtools/src/jdk.compiler/share/classes/com/sun/tools/classfile/Instruction.java Thu May 28 16:13:55 2015 -0700
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,353 +0,0 @@
-/*
- * Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-package com.sun.tools.classfile;
-
-import java.util.Locale;
-
-/**
- * See JVMS, chapter 6.
- *
- * <p><b>This is NOT part of any supported API.
- * If you write code that depends on this, you do so at your own risk.
- * This code and its internal interfaces are subject to change or
- * deletion without notice.</b>
- *
- * @see Code_attribute#getInstructions
- */
-public class Instruction {
- /** The kind of an instruction, as determined by the position, size and
- * types of its operands. */
- public static enum Kind {
- /** Opcode is not followed by any operands. */
- NO_OPERANDS(1),
- /** Opcode is followed by a byte indicating a type. */
- ATYPE(2),
- /** Opcode is followed by a 2-byte branch offset. */
- BRANCH(3),
- /** Opcode is followed by a 4-byte branch offset. */
- BRANCH_W(5),
- /** Opcode is followed by a signed byte value. */
- BYTE(2),
- /** Opcode is followed by a 1-byte index into the constant pool. */
- CPREF(2),
- /** Opcode is followed by a 2-byte index into the constant pool. */
- CPREF_W(3),
- /** Opcode is followed by a 2-byte index into the constant pool,
- * an unsigned byte value. */
- CPREF_W_UBYTE(4),
- /** Opcode is followed by a 2-byte index into the constant pool.,
- * an unsigned byte value, and a zero byte. */
- CPREF_W_UBYTE_ZERO(5),
- /** Opcode is followed by variable number of operands, depending
- * on the instruction.*/
- DYNAMIC(-1),
- /** Opcode is followed by a 1-byte reference to a local variable. */
- LOCAL(2),
- /** Opcode is followed by a 1-byte reference to a local variable,
- * and a signed byte value. */
- LOCAL_BYTE(3),
- /** Opcode is followed by a signed short value. */
- SHORT(3),
- /** Wide opcode is not followed by any operands. */
- WIDE_NO_OPERANDS(2),
- /** Wide opcode is followed by a 2-byte index into the local variables array. */
- WIDE_LOCAL(4),
- /** Wide opcode is followed by a 2-byte index into the constant pool. */
- WIDE_CPREF_W(4),
- /** Wide opcode is followed by a 2-byte index into the constant pool,
- * and a signed short value. */
- WIDE_CPREF_W_SHORT(6),
- /** Wide opcode is followed by a 2-byte reference to a local variable,
- * and a signed short value. */
- WIDE_LOCAL_SHORT(6),
- /** Opcode was not recognized. */
- UNKNOWN(1);
-
- Kind(int length) {
- this.length = length;
- }
-
- /** The length, in bytes, of this kind of instruction, or -1 is the
- * length depends on the specific instruction. */
- public final int length;
- }
-
- /** A utility visitor to help decode the operands of an instruction.
- * @see Instruction#accept */
- public interface KindVisitor<R,P> {
- /** See {@link Kind#NO_OPERANDS}, {@link Kind#WIDE_NO_OPERANDS}. */
- R visitNoOperands(Instruction instr, P p);
- /** See {@link Kind#ATYPE}. */
- R visitArrayType(Instruction instr, TypeKind kind, P p);
- /** See {@link Kind#BRANCH}, {@link Kind#BRANCH_W}. */
- R visitBranch(Instruction instr, int offset, P p);
- /** See {@link Kind#CPREF}, {@link Kind#CPREF_W}, {@link Kind#WIDE_CPREF_W}. */
- R visitConstantPoolRef(Instruction instr, int index, P p);
- /** See {@link Kind#CPREF_W_UBYTE}, {@link Kind#CPREF_W_UBYTE_ZERO}, {@link Kind#WIDE_CPREF_W_SHORT}. */
- R visitConstantPoolRefAndValue(Instruction instr, int index, int value, P p);
- /** See {@link Kind#LOCAL}, {@link Kind#WIDE_LOCAL}. */
- R visitLocal(Instruction instr, int index, P p);
- /** See {@link Kind#LOCAL_BYTE}. */
- R visitLocalAndValue(Instruction instr, int index, int value, P p);
- /** See {@link Kind#DYNAMIC}. */
- R visitLookupSwitch(Instruction instr, int default_, int npairs, int[] matches, int[] offsets, P p);
- /** See {@link Kind#DYNAMIC}. */
- R visitTableSwitch(Instruction instr, int default_, int low, int high, int[] offsets, P p);
- /** See {@link Kind#BYTE}, {@link Kind#SHORT}. */
- R visitValue(Instruction instr, int value, P p);
- /** Instruction is unrecognized. */
- R visitUnknown(Instruction instr, P p);
-
- }
-
- /** The kind of primitive array type to create.
- * See JVMS chapter 6, newarray. */
- public static enum TypeKind {
- T_BOOLEAN(4, "boolean"),
- T_CHAR(5, "char"),
- T_FLOAT(6, "float"),
- T_DOUBLE(7, "double"),
- T_BYTE(8, "byte"),
- T_SHORT(9, "short"),
- T_INT (10, "int"),
- T_LONG (11, "long");
- TypeKind(int value, String name) {
- this.value = value;
- this.name = name;
- }
-
- public static TypeKind get(int value) {
- switch (value) {
- case 4: return T_BOOLEAN;
- case 5: return T_CHAR;
- case 6: return T_FLOAT;
- case 7: return T_DOUBLE;
- case 8: return T_BYTE;
- case 9: return T_SHORT;
- case 10: return T_INT;
- case 11: return T_LONG;
- default: return null;
- }
- }
-
- public final int value;
- public final String name;
- }
-
- /** An instruction is defined by its position in a bytecode array. */
- public Instruction(byte[] bytes, int pc) {
- this.bytes = bytes;
- this.pc = pc;
- }
-
- /** Get the position of the instruction within the bytecode array. */
- public int getPC() {
- return pc;
- }
-
- /** Get a byte value, relative to the start of this instruction. */
- public int getByte(int offset) {
- return bytes[pc + offset];
- }
-
- /** Get an unsigned byte value, relative to the start of this instruction. */
- public int getUnsignedByte(int offset) {
- return getByte(offset) & 0xff;
- }
-
- /** Get a 2-byte value, relative to the start of this instruction. */
- public int getShort(int offset) {
- return (getByte(offset) << 8) | getUnsignedByte(offset + 1);
- }
-
- /** Get a unsigned 2-byte value, relative to the start of this instruction. */
- public int getUnsignedShort(int offset) {
- return getShort(offset) & 0xFFFF;
- }
-
- /** Get a 4-byte value, relative to the start of this instruction. */
- public int getInt(int offset) {
- return (getShort(offset) << 16) | (getUnsignedShort(offset + 2));
- }
-
- /** Get the Opcode for this instruction, or null if the instruction is
- * unrecognized. */
- public Opcode getOpcode() {
- int b = getUnsignedByte(0);
- switch (b) {
- case Opcode.NONPRIV:
- case Opcode.PRIV:
- case Opcode.WIDE:
- return Opcode.get(b, getUnsignedByte(1));
- }
- return Opcode.get(b);
- }
-
- /** Get the mnemonic for this instruction, or a default string if the
- * instruction is unrecognized. */
- public String getMnemonic() {
- Opcode opcode = getOpcode();
- if (opcode == null)
- return "bytecode " + getUnsignedByte(0);
- else
- return opcode.toString().toLowerCase(Locale.US);
- }
-
- /** Get the length, in bytes, of this instruction, including the opcode
- * and all its operands. */
- public int length() {
- Opcode opcode = getOpcode();
- if (opcode == null)
- return 1;
-
- switch (opcode) {
- case TABLESWITCH: {
- int pad = align(pc + 1) - pc;
- int low = getInt(pad + 4);
- int high = getInt(pad + 8);
- return pad + 12 + 4 * (high - low + 1);
- }
- case LOOKUPSWITCH: {
- int pad = align(pc + 1) - pc;
- int npairs = getInt(pad + 4);
- return pad + 8 + 8 * npairs;
-
- }
- default:
- return opcode.kind.length;
- }
- }
-
- /** Get the {@link Kind} of this instruction. */
- public Kind getKind() {
- Opcode opcode = getOpcode();
- return (opcode != null ? opcode.kind : Kind.UNKNOWN);
- }
-
- /** Invoke a method on the visitor according to the kind of this
- * instruction, passing in the decoded operands for the instruction. */
- public <R,P> R accept(KindVisitor<R,P> visitor, P p) {
- switch (getKind()) {
- case NO_OPERANDS:
- return visitor.visitNoOperands(this, p);
-
- case ATYPE:
- return visitor.visitArrayType(
- this, TypeKind.get(getUnsignedByte(1)), p);
-
- case BRANCH:
- return visitor.visitBranch(this, getShort(1), p);
-
- case BRANCH_W:
- return visitor.visitBranch(this, getInt(1), p);
-
- case BYTE:
- return visitor.visitValue(this, getByte(1), p);
-
- case CPREF:
- return visitor.visitConstantPoolRef(this, getUnsignedByte(1), p);
-
- case CPREF_W:
- return visitor.visitConstantPoolRef(this, getUnsignedShort(1), p);
-
- case CPREF_W_UBYTE:
- case CPREF_W_UBYTE_ZERO:
- return visitor.visitConstantPoolRefAndValue(
- this, getUnsignedShort(1), getUnsignedByte(3), p);
-
- case DYNAMIC: {
- switch (getOpcode()) {
- case TABLESWITCH: {
- int pad = align(pc + 1) - pc;
- int default_ = getInt(pad);
- int low = getInt(pad + 4);
- int high = getInt(pad + 8);
- int[] values = new int[high - low + 1];
- for (int i = 0; i < values.length; i++)
- values[i] = getInt(pad + 12 + 4 * i);
- return visitor.visitTableSwitch(
- this, default_, low, high, values, p);
- }
- case LOOKUPSWITCH: {
- int pad = align(pc + 1) - pc;
- int default_ = getInt(pad);
- int npairs = getInt(pad + 4);
- int[] matches = new int[npairs];
- int[] offsets = new int[npairs];
- for (int i = 0; i < npairs; i++) {
- matches[i] = getInt(pad + 8 + i * 8);
- offsets[i] = getInt(pad + 12 + i * 8);
- }
- return visitor.visitLookupSwitch(
- this, default_, npairs, matches, offsets, p);
- }
- default:
- throw new IllegalStateException();
- }
- }
-
- case LOCAL:
- return visitor.visitLocal(this, getUnsignedByte(1), p);
-
- case LOCAL_BYTE:
- return visitor.visitLocalAndValue(
- this, getUnsignedByte(1), getByte(2), p);
-
- case SHORT:
- return visitor.visitValue(this, getShort(1), p);
-
- case WIDE_NO_OPERANDS:
- return visitor.visitNoOperands(this, p);
-
- case WIDE_LOCAL:
- return visitor.visitLocal(this, getUnsignedShort(2), p);
-
- case WIDE_CPREF_W:
- return visitor.visitConstantPoolRef(this, getUnsignedShort(2), p);
-
- case WIDE_CPREF_W_SHORT:
- return visitor.visitConstantPoolRefAndValue(
- this, getUnsignedShort(2), getUnsignedByte(4), p);
-
- case WIDE_LOCAL_SHORT:
- return visitor.visitLocalAndValue(
- this, getUnsignedShort(2), getShort(4), p);
-
- case UNKNOWN:
- return visitor.visitUnknown(this, p);
-
- default:
- throw new IllegalStateException();
- }
- }
-
- private static int align(int n) {
- return (n + 3) & ~3;
- }
-
- private byte[] bytes;
- private int pc;
-}