package sun.jvm.hotspot.asm;
import java.io.PrintStream;
import java.nio.file.Path;
import java.util.List;
import java.util.Iterator;
import java.util.Properties;
import sun.jvm.hotspot.code.CodeBlob;
import sun.jvm.hotspot.code.NMethod;
import sun.jvm.hotspot.debugger.Address;
import sun.jvm.hotspot.debugger.DebuggerException;
import sun.jvm.hotspot.runtime.VM;
public class Disassembler {
private static String options = "";
private static long decode_function;
protected long startPc;
protected byte[] code;
private CodeBlob blob;
private NMethod nmethod;
public static void decode(InstructionVisitor visitor, CodeBlob blob) {
decode(visitor, blob, blob.codeBegin(), blob.codeEnd());
}
public static void decode(InstructionVisitor visitor, CodeBlob blob, Address begin, Address end) {
int codeSize = (int)end.minus(begin);
long startPc = VM.getAddressValue(begin);
byte[] code = new byte[codeSize];
for (int i = 0; i < code.length; i++)
code[i] = begin.getJByteAt(i);
Disassembler dis = new Disassembler(startPc, code);
dis.decode(visitor);
}
private Disassembler(long startPc, byte[] code) {
this.startPc = startPc;
this.code = code;
if (decode_function == 0) {
Properties targetSysProps = VM.getVM().getSystemProperties();
String os = targetSysProps.getProperty("os.name");
String ext = ".so";
if (os.contains("Windows")) {
ext = ".dll";
} else if (os.contains("Mac OS")) {
ext = ".dylib";
}
String jvmPattern = "^(lib)?jvm\\" + ext + "$";
Path jvmPath = VM.getVM()
.getDebugger()
.getCDebugger()
.getLoadObjectList()
.stream()
.map(o -> Path.of(o.getName()))
.filter(p -> p.getFileName().toString().matches(jvmPattern))
.findAny()
.get();
String arch = targetSysProps.getProperty("os.arch");
String libname = "hsdis-" + arch + ext;
List<String> libs = List.of(
jvmPath.resolveSibling("lib" + libname).toString(),
jvmPath.resolveSibling(libname).toString(),
jvmPath.getParent().resolveSibling(libname).toString(),
libname
);
var itr = libs.iterator();
while (itr.hasNext() && (decode_function == 0L)) {
try {
decode_function = load_library(itr.next());
} catch (DebuggerException e) {
if (!itr.hasNext()) {
throw e;
}
}
}
}
}
private static native long load_library(String hsdis_library_name);
private native void decode(InstructionVisitor visitor, long pc, byte[] code,
String options, long decode_function);
private void decode(InstructionVisitor visitor) {
visitor.prologue();
decode(visitor, startPc, code, options, decode_function);
visitor.epilogue();
}
private boolean match(String event, String tag) {
if (!event.startsWith(tag))
return false;
int taglen = tag.length();
if (taglen == event.length()) return true;
char delim = event.charAt(taglen);
return delim == ' ' || delim == '/' || delim == '=';
}
private long handleEvent(InstructionVisitor visitor, String event, long arg) {
if (match(event, "insn")) {
try {
visitor.beginInstruction(arg);
} catch (Throwable e) {
e.printStackTrace();
}
} else if (match(event, "/insn")) {
try {
visitor.endInstruction(arg);
} catch (Throwable e) {
e.printStackTrace();
}
} else if (match(event, "addr")) {
if (arg != 0) {
visitor.printAddress(arg);
}
return arg;
} else if (match(event, "mach")) {
} else {
}
return 0;
}
private void rawPrint(InstructionVisitor visitor, String s) {
visitor.print(s);
}
}