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Diffstat (limited to 'src/proguard/classfile/instruction/SimpleInstruction.java')
| -rw-r--r-- | src/proguard/classfile/instruction/SimpleInstruction.java | 255 |
1 files changed, 0 insertions, 255 deletions
diff --git a/src/proguard/classfile/instruction/SimpleInstruction.java b/src/proguard/classfile/instruction/SimpleInstruction.java deleted file mode 100644 index aecb56c..0000000 --- a/src/proguard/classfile/instruction/SimpleInstruction.java +++ /dev/null @@ -1,255 +0,0 @@ -/* - * ProGuard -- shrinking, optimization, obfuscation, and preverification - * of Java bytecode. - * - * Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu) - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the Free - * Software Foundation; either version 2 of the License, or (at your option) - * any later version. - * - * This program 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 for - * more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ -package proguard.classfile.instruction; - -import proguard.classfile.*; -import proguard.classfile.attribute.CodeAttribute; -import proguard.classfile.instruction.visitor.InstructionVisitor; - -/** - * This Instruction represents a simple instruction without variable arguments - * or constant pool references. - * - * @author Eric Lafortune - */ -public class SimpleInstruction extends Instruction -{ - public int constant; - - - /** - * Creates an uninitialized SimpleInstruction. - */ - public SimpleInstruction() {} - - - /** - * Creates a new SimpleInstruction with the given opcode. - */ - public SimpleInstruction(byte opcode) - { - this(opcode, embeddedConstant(opcode)); - } - - - /** - * Creates a new SimpleInstruction with the given opcode and constant. - */ - public SimpleInstruction(byte opcode, int constant) - { - this.opcode = opcode; - this.constant = constant; - } - - - /** - * Copies the given instruction into this instruction. - * @param simpleInstruction the instruction to be copied. - * @return this instruction. - */ - public SimpleInstruction copy(SimpleInstruction simpleInstruction) - { - this.opcode = simpleInstruction.opcode; - this.constant = simpleInstruction.constant; - - return this; - } - - - /** - * Return the embedded constant of the given opcode, or 0 if the opcode - * doesn't have one. - */ - private static int embeddedConstant(byte opcode) - { - switch (opcode) - { - case InstructionConstants.OP_ICONST_M1: return -1; - - case InstructionConstants.OP_ICONST_1: - case InstructionConstants.OP_LCONST_1: - case InstructionConstants.OP_FCONST_1: - case InstructionConstants.OP_DCONST_1: return 1; - - case InstructionConstants.OP_ICONST_2: - case InstructionConstants.OP_FCONST_2: return 2; - - case InstructionConstants.OP_ICONST_3: return 3; - - case InstructionConstants.OP_ICONST_4: return 4; - - case InstructionConstants.OP_ICONST_5: return 5; - - default: return 0; - } - } - - - // Implementations for Instruction. - - public byte canonicalOpcode() - { - // Replace any _1, _2, _3,... extension by _0. - switch (opcode) - { - case InstructionConstants.OP_ICONST_M1: - case InstructionConstants.OP_ICONST_0: - case InstructionConstants.OP_ICONST_1: - case InstructionConstants.OP_ICONST_2: - case InstructionConstants.OP_ICONST_3: - case InstructionConstants.OP_ICONST_4: - case InstructionConstants.OP_ICONST_5: - case InstructionConstants.OP_BIPUSH: - case InstructionConstants.OP_SIPUSH: return InstructionConstants.OP_ICONST_0; - - case InstructionConstants.OP_LCONST_0: - case InstructionConstants.OP_LCONST_1: return InstructionConstants.OP_LCONST_0; - - case InstructionConstants.OP_FCONST_0: - case InstructionConstants.OP_FCONST_1: - case InstructionConstants.OP_FCONST_2: return InstructionConstants.OP_FCONST_0; - - case InstructionConstants.OP_DCONST_0: - case InstructionConstants.OP_DCONST_1: return InstructionConstants.OP_DCONST_0; - - default: return opcode; - } - } - - public Instruction shrink() - { - // Reconstruct the opcode of the shortest instruction, if there are - // any alternatives. - switch (opcode) - { - case InstructionConstants.OP_ICONST_M1: - case InstructionConstants.OP_ICONST_0: - case InstructionConstants.OP_ICONST_1: - case InstructionConstants.OP_ICONST_2: - case InstructionConstants.OP_ICONST_3: - case InstructionConstants.OP_ICONST_4: - case InstructionConstants.OP_ICONST_5: - case InstructionConstants.OP_BIPUSH: - case InstructionConstants.OP_SIPUSH: - switch (requiredConstantSize()) - { - case 0: - opcode = (byte)(InstructionConstants.OP_ICONST_0 + constant); - break; - case 1: - opcode = InstructionConstants.OP_BIPUSH; - break; - case 2: - opcode = InstructionConstants.OP_SIPUSH; - break; - } - break; - - case InstructionConstants.OP_LCONST_0: - case InstructionConstants.OP_LCONST_1: - opcode = (byte)(InstructionConstants.OP_LCONST_0 + constant); - break; - - case InstructionConstants.OP_FCONST_0: - case InstructionConstants.OP_FCONST_1: - case InstructionConstants.OP_FCONST_2: - opcode = (byte)(InstructionConstants.OP_FCONST_0 + constant); - break; - - case InstructionConstants.OP_DCONST_0: - case InstructionConstants.OP_DCONST_1: - opcode = (byte)(InstructionConstants.OP_DCONST_0 + constant); - break; - } - - return this; - } - - protected void readInfo(byte[] code, int offset) - { - int constantSize = constantSize(); - - // Also initialize embedded constants that are different from 0. - constant = constantSize == 0 ? - embeddedConstant(opcode) : - readSignedValue(code, offset, constantSize); - } - - - protected void writeInfo(byte[] code, int offset) - { - int constantSize = constantSize(); - - if (requiredConstantSize() > constantSize) - { - throw new IllegalArgumentException("Instruction has invalid constant size ("+this.toString(offset)+")"); - } - - writeSignedValue(code, offset, constant, constantSize); - } - - - public int length(int offset) - { - return 1 + constantSize(); - } - - - public void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, InstructionVisitor instructionVisitor) - { - instructionVisitor.visitSimpleInstruction(clazz, method, codeAttribute, offset, this); - } - - - // Implementations for Object. - - public String toString() - { - return getName() + - (constantSize() > 0 ? " "+constant : ""); - } - - - // Small utility methods. - - /** - * Returns the constant size for this instruction. - */ - private int constantSize() - { - return opcode == InstructionConstants.OP_BIPUSH || - opcode == InstructionConstants.OP_NEWARRAY ? 1 : - opcode == InstructionConstants.OP_SIPUSH ? 2 : - 0; - } - - - /** - * Computes the required constant size for this instruction. - */ - private int requiredConstantSize() - { - return constant >= -1 && constant <= 5 ? 0 : - (byte)constant == constant ? 1 : - (short)constant == constant ? 2 : - 4; - } -} |