1 files changed, 143 insertions, 0 deletions
diff --git a/benchmarks/src/jmh/java/org/objectweb/asm/benchmarks/JClassLibGenerator.java b/benchmarks/src/jmh/java/org/objectweb/asm/benchmarks/JClassLibGenerator.java
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+++ b/benchmarks/src/jmh/java/org/objectweb/asm/benchmarks/JClassLibGenerator.java
@@ -0,0 +1,143 @@
+// 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.objectweb.asm.benchmarks;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.util.Arrays;
+import org.gjt.jclasslib.bytecode.ImmediateByteInstruction;
+import org.gjt.jclasslib.bytecode.ImmediateShortInstruction;
+import org.gjt.jclasslib.bytecode.Opcodes;
+import org.gjt.jclasslib.bytecode.SimpleInstruction;
+import org.gjt.jclasslib.io.ByteCodeWriter;
+import org.gjt.jclasslib.structures.AccessFlags;
+import org.gjt.jclasslib.structures.AttributeInfo;
+import org.gjt.jclasslib.structures.CPInfo;
+import org.gjt.jclasslib.structures.ClassFile;
+import org.gjt.jclasslib.structures.ConstantPoolUtil;
+import org.gjt.jclasslib.structures.InvalidByteCodeException;
+import org.gjt.jclasslib.structures.MethodInfo;
+import org.gjt.jclasslib.structures.attributes.CodeAttribute;
+import org.gjt.jclasslib.structures.attributes.SourceFileAttribute;
+import org.gjt.jclasslib.structures.constants.ConstantStringInfo;
+
+/**
+ * A "Hello World!" class generator using the JClassLib library.
+ *
+ * @author Eric Bruneton
+ */
+public class JClassLibGenerator extends Generator {
+
+  @Override
+  public byte[] generateClass() {
+    try {
+      ClassFile classFile = new ClassFile();
+      classFile.setConstantPool(new CPInfo[0]);
+      ConstantPoolUtil.addConstantUTF8Info(classFile, "", 0); // dummy constant
+      classFile.setMajorVersion(45);
+      classFile.setMinorVersion(3);
+      classFile.setAccessFlags(AccessFlags.ACC_PUBLIC);
+      classFile.setThisClass(ConstantPoolUtil.addConstantClassInfo(classFile, "HelloWorld", 0));
+      classFile.setSuperClass(
+          ConstantPoolUtil.addConstantClassInfo(classFile, "java/lang/Object", 0));
+
+      SourceFileAttribute sourceFileAttribute = new SourceFileAttribute();
+      sourceFileAttribute.setAttributeNameIndex(
+          ConstantPoolUtil.addConstantUTF8Info(classFile, SourceFileAttribute.ATTRIBUTE_NAME, 0));
+      sourceFileAttribute.setSourcefileIndex(
+          ConstantPoolUtil.addConstantUTF8Info(classFile, "HelloWorld.java", 0));
+
+      MethodInfo methodInfo1 = new MethodInfo();
+      methodInfo1.setAccessFlags(AccessFlags.ACC_PUBLIC);
+      methodInfo1.setNameIndex(ConstantPoolUtil.addConstantUTF8Info(classFile, "<init>", 0));
+      methodInfo1.setDescriptorIndex(ConstantPoolUtil.addConstantUTF8Info(classFile, "()V", 0));
+      CodeAttribute codeAttribute1 = new CodeAttribute();
+      codeAttribute1.setAttributeNameIndex(
+          ConstantPoolUtil.addConstantUTF8Info(classFile, CodeAttribute.ATTRIBUTE_NAME, 0));
+      codeAttribute1.setCode(
+          ByteCodeWriter.writeByteCode(
+              Arrays.asList(
+                  new SimpleInstruction(Opcodes.OPCODE_ALOAD_0),
+                  new ImmediateShortInstruction(
+                      Opcodes.OPCODE_INVOKESPECIAL,
+                      ConstantPoolUtil.addConstantMethodrefInfo(
+                          classFile, "java/lang/Object", "<init>", "()V", 0)),
+                  new SimpleInstruction(Opcodes.OPCODE_RETURN))));
+      codeAttribute1.setMaxStack(1);
+      codeAttribute1.setMaxLocals(1);
+      methodInfo1.setAttributes(new AttributeInfo[] {codeAttribute1});
+
+      ConstantStringInfo constantStringInfo = new ConstantStringInfo();
+      constantStringInfo.setStringIndex(
+          ConstantPoolUtil.addConstantUTF8Info(classFile, "Hello world!", 0));
+
+      MethodInfo methodInfo2 = new MethodInfo();
+      methodInfo2.setAccessFlags(AccessFlags.ACC_PUBLIC | AccessFlags.ACC_STATIC);
+      methodInfo2.setNameIndex(ConstantPoolUtil.addConstantUTF8Info(classFile, "main", 0));
+      methodInfo2.setDescriptorIndex(
+          ConstantPoolUtil.addConstantUTF8Info(classFile, "([Ljava/lang/String;)V", 0));
+      CodeAttribute codeAttribute2 = new CodeAttribute();
+      codeAttribute2.setAttributeNameIndex(
+          ConstantPoolUtil.addConstantUTF8Info(classFile, CodeAttribute.ATTRIBUTE_NAME, 0));
+      codeAttribute2.setCode(
+          ByteCodeWriter.writeByteCode(
+              Arrays.asList(
+                  new ImmediateShortInstruction(
+                      Opcodes.OPCODE_GETSTATIC,
+                      ConstantPoolUtil.addConstantFieldrefInfo(
+                          classFile, "java/lang/System", "out", "Ljava/io/PrintStream;", 0)),
+                  new ImmediateByteInstruction(
+                      Opcodes.OPCODE_LDC,
+                      false,
+                      ConstantPoolUtil.addConstantPoolEntry(classFile, constantStringInfo, 0)),
+                  new ImmediateShortInstruction(
+                      Opcodes.OPCODE_INVOKEVIRTUAL,
+                      ConstantPoolUtil.addConstantMethodrefInfo(
+                          classFile,
+                          "java/io/PrintStream",
+                          "println",
+                          "(Ljava/lang/String;)V",
+                          0)))));
+      codeAttribute2.setMaxStack(2);
+      codeAttribute2.setMaxLocals(1);
+      methodInfo2.setAttributes(new AttributeInfo[] {codeAttribute2});
+
+      classFile.setMethods(new MethodInfo[] {methodInfo1, methodInfo2});
+      classFile.setAttributes(new AttributeInfo[] {sourceFileAttribute});
+
+      try (ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+          DataOutputStream dataOutputStream = new DataOutputStream(byteArrayOutputStream)) {
+        classFile.write(dataOutputStream);
+        return byteArrayOutputStream.toByteArray();
+      }
+    } catch (IOException | InvalidByteCodeException e) {
+      throw new RuntimeException("Class generation failed", e);
+    }
+  }
+}