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feat: added BytecodePrinter
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2 changed files with 81 additions and 0 deletions
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@ -8,4 +8,6 @@ repositories {
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dependencies {
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implementation 'org.ow2.asm:asm-commons:9.4'
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implementation 'org.ow2.asm:asm-util:9.4'
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implementation 'org.apache.logging.log4j:log4j-api:2.15.0'
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}
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79
src/main/java/ftbsc/lll/tools/debug/BytecodePrinter.java
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79
src/main/java/ftbsc/lll/tools/debug/BytecodePrinter.java
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@ -0,0 +1,79 @@
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package ftbsc.lll.tools.debug;
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import org.apache.logging.log4j.Logger;
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import org.objectweb.asm.tree.AbstractInsnNode;
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import org.objectweb.asm.tree.MethodNode;
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import org.objectweb.asm.util.Printer;
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import org.objectweb.asm.util.Textifier;
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import org.objectweb.asm.util.TraceMethodVisitor;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.io.StringWriter;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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/**
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* A collection of static methods for debugging by printing the ASM bytecode.
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* These methods are only for debug, so most of the time they should stay unused.
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*/
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public class BytecodePrinter {
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/**
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* Used for converting visit events to text, acts pretty much like a buffer in our case.
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*/
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private static final Printer PRINTER = new Textifier();
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/**
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* MethodVisitor that visits the method and prints it to a given printer.
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*/
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private static final TraceMethodVisitor MP = new TraceMethodVisitor(PRINTER);
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/**
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* Prints the bytecode of a method using System.out.print().
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* @param main the method to print
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*/
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public static void printAsmMethod(final MethodNode main) {
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for (AbstractInsnNode i : main.instructions.toArray())
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System.out.print(insnToString(i));
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}
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/**
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* Logs the bytecode of a method using the ASM logger.
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* @param main the method to print
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* @param logger the Log4j logger to print it with
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*/
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public static void logAsmMethod(final MethodNode main, final Logger logger) {
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for (AbstractInsnNode i : main.instructions.toArray())
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logger.debug(insnToString(i));
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}
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/**
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* Logs the bytecode of a method to a file.
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* @param main the method to print
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* @param path the file to log it to
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*/
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public static void logAsmMethod(final MethodNode main, String path) {
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StringBuilder out = new StringBuilder();
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for (AbstractInsnNode i : main.instructions.toArray())
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out.append(insnToString(i));
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try {
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Files.write(Paths.get(path), out.toString().getBytes());
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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/**
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* Converts an instruction node to a String.
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* @param insn the node to convert
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* @return the converted string
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*/
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public static String insnToString(AbstractInsnNode insn) {
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insn.accept(MP);
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StringWriter sw = new StringWriter();
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PRINTER.print(new PrintWriter(sw));
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PRINTER.getText().clear();
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return sw.toString();
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}
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}
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