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package org.glavo.javah;
import org.objectweb.asm.*;
import java.io.*;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
public final class HeaderGenerator {
private static String escape(String source) {
StringBuilder builder = new StringBuilder();
char ch;
for (int i = 0; i < source.length(); i++) {
switch (ch = source.charAt(i)) {
case '_':
builder.append("_1");
break;
case ';':
builder.append("_2");
break;
case '[':
builder.append("_3");
break;
case '/':
builder.append('.');
break;
default:
if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')) {
builder.append(ch);
} else {
builder.append("_0").append(String.format("%04x", (int) ch));
}
}
}
return builder.toString();
}
private static String typeToNative(Type tpe) {
if (tpe == Type.BOOLEAN_TYPE) {
return "jboolean";
} else if (tpe == Type.BYTE_TYPE) {
return "jbyte";
} else if (tpe == Type.CHAR_TYPE) {
return "jchar";
} else if (tpe == Type.SHORT_TYPE) {
return "jshort";
} else if (tpe == Type.INT_TYPE) {
return "jint";
} else if (tpe == Type.LONG_TYPE) {
return "jlong";
} else if (tpe == Type.FLOAT_TYPE) {
return "jfloat";
} else if (tpe == Type.DOUBLE_TYPE) {
return "jdouble";
} else if (tpe == Type.VOID_TYPE) {
return "void";
} else {
String str = tpe.toString();
if (str.startsWith("[")) {
str = typeToNative(tpe.getElementType());
if ("jclass".equals(str)) {
return "jobjectArray";
} else {
return str + "Array";
}
}
return "jobject"; //TODO: jthrowable
}
}
public static void generateHeader(ClassReader reader, PrintWriter output) {
output.println("/* DO NOT EDIT THIS FILE - it is machine generated */");
output.println("#include <jni.h>");
Generator generator = new Generator();
reader.accept(generator, ClassReader.SKIP_CODE | ClassReader.SKIP_DEBUG | ClassReader.SKIP_FRAMES);
StringBuilder builder = new StringBuilder();
String className = escape(generator.getClassName());
output.println("/* Header for class " + className + " */");
String includeHeader = "_Include_" + className;
output.println("#ifndef " + includeHeader);
output.println("#define " + includeHeader);
output.println("#ifdef __cplusplus\n" +
"extern \"C\" {\n" +
"#endif");
for (Map.Entry<String, Set<MethodDesc>> entry : generator.getMethods().entrySet()) {
boolean overload = entry.getValue().size() > 1;
for (MethodDesc desc : entry.getValue()) {
String methodName = escape(entry.getKey());
output.println("/*" + "\n" +
" * Class: " + className + "\n" +
" * Method: " + entry.getKey() + "\n" +
" * Signature: " + desc.descriptor + "\n" +
" */"
);
Type[] argTypes = Type.getArgumentTypes(desc.descriptor);
Type retType = Type.getReturnType(desc.descriptor);
output.print(
"JNIEXPORT " + typeToNative(retType) + " JNICALL Java_" + className + "_" + methodName
);
if (overload) {
output.print("__");
for (Type tpe : argTypes) {
output.print(escape(tpe.toString()));
}
}
output.println();
output.print(" (JNIEnv *, ");
if (desc.isStatic) {
output.print("jclass");
} else {
output.print("jobject");
}
for (Type tpe : argTypes) {
output.print(", " + typeToNative(tpe));
}
output.println(");\n");
}
}
output.println("#ifdef __cplusplus\n" +
"}\n" +
"#endif\n" +
"#endif\n");
}
public static void generateHeader(byte[] classFile, PrintWriter output) {
generateHeader(new ClassReader(classFile), output);
}
public static void generateHeader(byte[] classFileBuffer, int classFileOffset, int classFileLength, PrintWriter output) {
generateHeader(new ClassReader(classFileBuffer, classFileOffset, classFileLength), output);
}
public static void generateHeader(String className, PrintWriter output) throws IOException {
generateHeader(new ClassReader(className), output);
}
public static void generateHeader(InputStream input, PrintWriter output) throws IOException {
generateHeader(new ClassReader(input), output);
}
public static void main(String[] args) throws IOException {
File f = new File(args[0]);
PrintWriter writer = new PrintWriter(System.out);
generateHeader(new FileInputStream(f), writer);
writer.flush();
}
}
class MethodDesc {
public final boolean isStatic;
public final String descriptor;
public MethodDesc(boolean isStatic, String descriptor) {
this.isStatic = isStatic;
this.descriptor = descriptor;
}
}
class Generator extends ClassVisitor {
private String className;
private Map<String, Set<MethodDesc>> methods = new LinkedHashMap<String, Set<MethodDesc>>();
public Generator() {
super(Opcodes.ASM5);
}
@Override
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
className = name;
}
@Override
public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
if ((access & Opcodes.ACC_NATIVE) != 0) {
if (methods.containsKey(name)) {
methods.get(name).add(new MethodDesc((access & Opcodes.ACC_STATIC) != 0, descriptor));
} else {
LinkedHashSet<MethodDesc> set = new LinkedHashSet<MethodDesc>();
set.add(new MethodDesc((access & Opcodes.ACC_STATIC) != 0, descriptor));
methods.put(name, set);
}
}
return null;
}
public String getClassName() {
return className;
}
public Map<String, Set<MethodDesc>> getMethods() {
return methods;
}
}
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