| // 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.apache.tapestry5.internal.plastic.asm.commons; |
| |
| import org.apache.tapestry5.internal.plastic.asm.ConstantDynamic; |
| import org.apache.tapestry5.internal.plastic.asm.Handle; |
| import org.apache.tapestry5.internal.plastic.asm.Label; |
| import org.apache.tapestry5.internal.plastic.asm.MethodVisitor; |
| import org.apache.tapestry5.internal.plastic.asm.Opcodes; |
| |
| /** |
| * A {@link MethodVisitor} that approximates the size of the methods it visits. |
| * |
| * @author Eugene Kuleshov |
| */ |
| public class CodeSizeEvaluator extends MethodVisitor implements Opcodes { |
| |
| /** The minimum size in bytes of the visited method. */ |
| private int minSize; |
| |
| /** The maximum size in bytes of the visited method. */ |
| private int maxSize; |
| |
| public CodeSizeEvaluator(final MethodVisitor methodVisitor) { |
| this(Opcodes.ASM7, methodVisitor); |
| } |
| |
| protected CodeSizeEvaluator(final int api, final MethodVisitor methodVisitor) { |
| super(api, methodVisitor); |
| } |
| |
| public int getMinSize() { |
| return this.minSize; |
| } |
| |
| public int getMaxSize() { |
| return this.maxSize; |
| } |
| |
| @Override |
| public void visitInsn(final int opcode) { |
| minSize += 1; |
| maxSize += 1; |
| super.visitInsn(opcode); |
| } |
| |
| @Override |
| public void visitIntInsn(final int opcode, final int operand) { |
| if (opcode == SIPUSH) { |
| minSize += 3; |
| maxSize += 3; |
| } else { |
| minSize += 2; |
| maxSize += 2; |
| } |
| super.visitIntInsn(opcode, operand); |
| } |
| |
| @Override |
| public void visitVarInsn(final int opcode, final int var) { |
| if (var < 4 && opcode != RET) { |
| minSize += 1; |
| maxSize += 1; |
| } else if (var >= 256) { |
| minSize += 4; |
| maxSize += 4; |
| } else { |
| minSize += 2; |
| maxSize += 2; |
| } |
| super.visitVarInsn(opcode, var); |
| } |
| |
| @Override |
| public void visitTypeInsn(final int opcode, final String type) { |
| minSize += 3; |
| maxSize += 3; |
| super.visitTypeInsn(opcode, type); |
| } |
| |
| @Override |
| public void visitFieldInsn( |
| final int opcode, final String owner, final String name, final String descriptor) { |
| minSize += 3; |
| maxSize += 3; |
| super.visitFieldInsn(opcode, owner, name, descriptor); |
| } |
| |
| /** |
| * Deprecated. |
| * |
| * @deprecated use {@link #visitMethodInsn(int, String, String, String, boolean)} instead. |
| */ |
| @Deprecated |
| @Override |
| public void visitMethodInsn( |
| final int opcode, final String owner, final String name, final String descriptor) { |
| if (api >= Opcodes.ASM5) { |
| super.visitMethodInsn(opcode, owner, name, descriptor); |
| return; |
| } |
| doVisitMethodInsn(opcode, owner, name, descriptor, opcode == Opcodes.INVOKEINTERFACE); |
| } |
| |
| @Override |
| public void visitMethodInsn( |
| final int opcode, |
| final String owner, |
| final String name, |
| final String descriptor, |
| final boolean isInterface) { |
| if (api < Opcodes.ASM5) { |
| super.visitMethodInsn(opcode, owner, name, descriptor, isInterface); |
| return; |
| } |
| doVisitMethodInsn(opcode, owner, name, descriptor, isInterface); |
| } |
| |
| private void doVisitMethodInsn( |
| final int opcode, |
| final String owner, |
| final String name, |
| final String descriptor, |
| final boolean isInterface) { |
| if (opcode == INVOKEINTERFACE) { |
| minSize += 5; |
| maxSize += 5; |
| } else { |
| minSize += 3; |
| maxSize += 3; |
| } |
| if (mv != null) { |
| mv.visitMethodInsn(opcode, owner, name, descriptor, isInterface); |
| } |
| } |
| |
| @Override |
| public void visitInvokeDynamicInsn( |
| final String name, |
| final String descriptor, |
| final Handle bootstrapMethodHandle, |
| final Object... bootstrapMethodArguments) { |
| minSize += 5; |
| maxSize += 5; |
| super.visitInvokeDynamicInsn(name, descriptor, bootstrapMethodHandle, bootstrapMethodArguments); |
| } |
| |
| @Override |
| public void visitJumpInsn(final int opcode, final Label label) { |
| minSize += 3; |
| if (opcode == GOTO || opcode == JSR) { |
| maxSize += 5; |
| } else { |
| maxSize += 8; |
| } |
| super.visitJumpInsn(opcode, label); |
| } |
| |
| @Override |
| public void visitLdcInsn(final Object value) { |
| if (value instanceof Long |
| || value instanceof Double |
| || (value instanceof ConstantDynamic && ((ConstantDynamic) value).getSize() == 2)) { |
| minSize += 3; |
| maxSize += 3; |
| } else { |
| minSize += 2; |
| maxSize += 3; |
| } |
| super.visitLdcInsn(value); |
| } |
| |
| @Override |
| public void visitIincInsn(final int var, final int increment) { |
| if (var > 255 || increment > 127 || increment < -128) { |
| minSize += 6; |
| maxSize += 6; |
| } else { |
| minSize += 3; |
| maxSize += 3; |
| } |
| super.visitIincInsn(var, increment); |
| } |
| |
| @Override |
| public void visitTableSwitchInsn( |
| final int min, final int max, final Label dflt, final Label... labels) { |
| minSize += 13 + labels.length * 4; |
| maxSize += 16 + labels.length * 4; |
| super.visitTableSwitchInsn(min, max, dflt, labels); |
| } |
| |
| @Override |
| public void visitLookupSwitchInsn(final Label dflt, final int[] keys, final Label[] labels) { |
| minSize += 9 + keys.length * 8; |
| maxSize += 12 + keys.length * 8; |
| super.visitLookupSwitchInsn(dflt, keys, labels); |
| } |
| |
| @Override |
| public void visitMultiANewArrayInsn(final String descriptor, final int numDimensions) { |
| minSize += 4; |
| maxSize += 4; |
| super.visitMultiANewArrayInsn(descriptor, numDimensions); |
| } |
| } |