/***
* ASM tests
* Copyright (c) 2002-2005 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.ow2.asm.test.cases;
import java.io.IOException;
import org.ow2.asm.ClassWriter;
import org.ow2.asm.Label;
import org.ow2.asm.MethodVisitor;
/**
* Generates a class which uses a lot of locals and constant pool values. Covers
* the 'wide' form of instructions that have one (xLOAD and xSTORE, LDC, IINC,
* GOTO and IF instructions - these jump instructions are not directly generated
* in their 'wide' form, but are transformed to this form by the method resizing
* test). Also covers the V1_2 class version.
*
* @author Eric Bruneton
*/
public class Wide extends Generator {
@Override
public void generate(final String dir) throws IOException {
generate(dir, "pkg/Wide.class", dump());
}
public byte[] dump() {
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
MethodVisitor mv;
cw.visit(V1_2, ACC_PUBLIC, "pkg/Wide", null, "java/lang/Object", null);
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
for (int i = 0; i < 256; ++i) {
mv.visitLdcInsn(Integer.toString(i)); // wide form
mv.visitInsn(POP);
}
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
mv = cw.visitMethod(ACC_PUBLIC, "wideLocals", "(I)I", null, null);
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
mv.visitJumpInsn(GOTO, l1); // will give GOTO_W
mv.visitLabel(l0);
mv.visitIincInsn(300, 1); // covers 'update maxlocals' in MethodWriter
mv.visitVarInsn(ILOAD, 300); // will give wide form
mv.visitJumpInsn(IFEQ, l1); // will give long forward jump
// many NOPs will be introduced here by the method resizing test
mv.visitVarInsn(ILOAD, 300); // will give wide form
mv.visitInsn(IRETURN);
mv.visitLabel(l1);
for (int i = 1; i < 300; ++i) {
mv.visitVarInsn(ILOAD, i);
if (i <= 5) {
mv.visitInsn(ICONST_0 + i);
} else if (i <= Byte.MAX_VALUE) {
mv.visitIntInsn(BIPUSH, i);
} else {
mv.visitIntInsn(SIPUSH, i);
}
mv.visitInsn(IADD);
mv.visitVarInsn(ISTORE, i + 1);
}
mv.visitInsn(ICONST_0);
mv.visitJumpInsn(IFEQ, l0); // will give long backward jump
mv.visitJumpInsn(GOTO, l0); // will give long backward goto
mv.visitMaxs(0, 0);
mv.visitEnd();
cw.visitEnd();
return cw.toByteArray();
}
}