java-bytecode-asm

I am trying to: 1) Iterate instructions and find all relevant nodes 2) Insert custom code before found nodes I used streams and iterator to make it and insert, which works only for the first node InsnList instructions = methodNode.instructions; InsnList addition = ... //It work: found n nodes for n return instructions Stream<AbstractInsnNode> returnNodes = Stream.iterate(instructions.getFirst(), AbstractInsnNode::getNext).limit(instructions.size()) .filter(n -> returnOpcodes.contains(n.getOpcode())); //It not work: inserted only before first node returnNodes.forEach(n -> instructions

I am attempting to use the Java byte code engineering library ASM to perform static analysis. I have the situation where I would like to inspect the variables being assigned to a field. I have MethodVisitor which implements the visitFieldInsn() method. I am specifically looking for the putfield command. That is no problem. The problem is that when I encounter putfield , I want to be able to access the variable that's going to be assigned to the field. Specifically I want to access information about the type of the variable. At the moment I really only need to look at what's at the top of the

Goal Detecting where comparisons between and copies of variables are made Inject code near the line where the operation has happened The purpose of the code: everytime the class is ran make a counter increase General purpose: count the amount of comparisons and copies made after execution with certain parameters 2 options Note: I always have a .java file to begin with 1) Edit java file Find comparisons with regex and inject pieces of code near the line And then compile the class (My application uses JavaCompiler) 2)Use ASM Bytecode engineering Also detecting where the events i want to track

I am currently trying make my custom compiler allow using try/catch as an expression, i.e. leaving a value on the stack. The type checker and the backend already support this, but the problem seems to be ASM's COMPUTE_FRAMES . With the below code for instrumentation: private void write(MethodWriter writer, boolean expression) { org.objectweb.asm.Label tryStart = new org.objectweb.asm.Label(); org.objectweb.asm.Label tryEnd = new org.objectweb.asm.Label(); org.objectweb.asm.Label endLabel = new org.objectweb.asm.Label(); boolean hasFinally = this.finallyBlock != null; writer.writeLabel(tryStart

I'm trying to install this: http://asm.ow2.org/eclipse/index.html , but I get this error which makes zero sense to me. I'm running eclipse Kepler Service Release 1, build id 20130919-0819. Cannot complete the install because one or more required items could not be found. Software being installed: Bytecode Outline 2.1.0 (de.loskutov.BytecodeOutline.feature.feature.group 2.1.0) Missing requirement: Bytecode Outline 2.1.0 (de.loskutov.BytecodeOutline.feature.feature.group 2.1.0) requires 'org.eclipse.help.appserver 0.0.0' but it could not be found After Eclipse 3.3 "org.eclipse.help.appserver"

I have a Java loop that looks like this: public void testMethod() { int[] nums = new int[10]; for (int i = 0; i < nums.length; i++) { nums[i] = 0x42; } } The assembly I get is this: 0x00000001296ac845: cmp %r10d,%ebp 0x00000001296ac848: jae 0x00000001296ac8b4 0x00000001296ac84a: movl $0x42,0x10(%rbx,%rbp,4) 0x00000001296ac852: inc %ebp 0x00000001296ac854: cmp %r11d,%ebp 0x00000001296ac857: jl 0x00000001296ac845 0x00000001296ac859: mov %r10d,%r8d 0x00000001296ac85c: add $0xfffffffd,%r8d 0x00000001296ac860: mov $0x80000000,%r9d 0x00000001296ac866: cmp %r8d,%r10d 0x00000001296ac869: cmovl %r9d,