/***
* 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 classes with JSR/RET instructions. Covers forward and backward JSR
* and JSR_W instructions. Also covers the wide form of IFNULL instruction, and
* the V1_1 class version (these jump instructions are not directly generated in
* their 'wide' form, but are transformed to this form by the method resizing
* test).
*
* @author Eric Bruneton
*
*/
public class JSR extends Generator {
@Override
public void generate(final String dir) throws IOException {
generate(dir, "pkg/JSR1.class", dumpForwardJSR());
generate(dir, "pkg/JSR2.class", dumpBackwardJSR());
}
public byte[] dumpForwardJSR() {
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
MethodVisitor mv;
cw.visit(V1_1, ACC_PUBLIC, "pkg/JSR1", 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");
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
mv = cw.visitMethod(ACC_PUBLIC, "forwardJSR", "([I)V", null, null);
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
Label l2 = new Label();
Label l3 = new Label();
Label l4 = new Label();
Label l5 = new Label();
mv.visitTryCatchBlock(l0, l1, l2, null);
mv.visitTryCatchBlock(l2, l3, l2, null);
mv.visitLabel(l0);
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, "pkg/JSR1", "forwardJSR", "([I)V");
mv.visitJumpInsn(JSR, l4); // forward JSR, will give forward JSR_W
// many NOPs will be introduced here by the method resizing test
mv.visitLabel(l1);
mv.visitJumpInsn(GOTO, l5);
mv.visitLabel(l2);
mv.visitVarInsn(ASTORE, 2);
mv.visitJumpInsn(JSR, l4);
mv.visitLabel(l3);
mv.visitVarInsn(ALOAD, 2);
mv.visitInsn(ATHROW);
mv.visitLabel(l4);
mv.visitVarInsn(ASTORE, 3);
mv.visitInsn(DCONST_0);
mv.visitVarInsn(DSTORE, 4);
mv.visitVarInsn(RET, 3);
mv.visitLabel(l5);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
cw.visitEnd();
return cw.toByteArray();
}
public byte[] dumpBackwardJSR() {
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
MethodVisitor mv;
cw.visit(V1_1, ACC_PUBLIC, "pkg/JSR2", 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");
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
mv = cw.visitMethod(ACC_PUBLIC, "backwardJSR", "([I)V", null, null);
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
Label l2 = new Label();
Label l3 = new Label();
Label l4 = new Label();
Label l5 = new Label();
Label l6 = new Label();
mv.visitTryCatchBlock(l0, l1, l2, null);
mv.visitTryCatchBlock(l2, l3, l2, null);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ISTORE, 4);
mv.visitJumpInsn(GOTO, l0);
mv.visitLabel(l4);
mv.visitVarInsn(ASTORE, 3);
mv.visitIincInsn(4, 1);
mv.visitVarInsn(RET, 3);
/* extra instructions only used to trigger method resizing */
mv.visitLabel(l0);
mv.visitInsn(ACONST_NULL);
mv.visitJumpInsn(IFNULL, l6); // will give wide IFNULL
// many NOPs will be introduced here by the method resizing test
mv.visitJumpInsn(GOTO, l6);
mv.visitLabel(l6);
mv.visitJumpInsn(JSR, l4); // backward JSR, will give JSR_W
mv.visitLabel(l1);
mv.visitJumpInsn(GOTO, l5);
mv.visitLabel(l2);
mv.visitVarInsn(ASTORE, 2);
mv.visitJumpInsn(JSR, l4);
mv.visitLabel(l3);
mv.visitVarInsn(ALOAD, 2);
mv.visitInsn(ATHROW);
mv.visitLabel(l5);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
cw.visitEnd();
return cw.toByteArray();
}
}