Examples with ConstantPoolGen org.apache.bcel.generic.ConstantPoolGen used on opensource projects

Example 6 with ConstantPoolGen

use of org.apache.bcel.generic.ConstantPoolGen in project jop by jop-devel.

the class ConstantPoolRebuilder method createNewConstantPool.

public ConstantPoolGen createNewConstantPool(ConstantPoolGen oldPool, Set<Integer> usedIndices) {
    // We add all used entries to the new pool in the same order as in the old pool
    // to avoid indices getting larger than before
    Integer[] ids = new ArrayList<Integer>(usedIndices).toArray(new Integer[usedIndices.size()]);
    Arrays.sort(ids);
    // First thing we need is a map, since we need to relink the constantpool entries
    idMap.clear();
    // Note that index 0 is not valid, so skip it
    List<Constant> constants = new ArrayList<Constant>(usedIndices.size() + 1);
    constants.add(null);
    int newPos = 1;
    for (int id : ids) {
        Constant c = oldPool.getConstant(id);
        // we cannot use newPool.addConstant here, because this would add all referenced constants too,
        // and we do not want that..
        constants.add(c);
        idMap.put(id, newPos++);
        if (c instanceof ConstantLong || c instanceof ConstantDouble) {
            // reserve an additional slot for those
            constants.add(null);
            newPos++;
        }
    }
    // now we create new constants and map the references
    Constant[] newConstants = new Constant[constants.size()];
    for (int i = 1; i < constants.size(); i++) {
        Constant c = constants.get(i);
        if (c == null)
            continue;
        newConstants[i] = copyConstant(idMap, c);
    }
    newPool = new ConstantPoolGen(newConstants);
    return newPool;
}

Example 7 with ConstantPoolGen

use of org.apache.bcel.generic.ConstantPoolGen in project jop by jop-devel.

the class DFATool method buildPrologue.

private MethodInfo buildPrologue(MethodInfo mainMethod, List<InstructionHandle> statements, Flow flow, List<ClassInfo> clinits) {
    // we use a prologue sequence for startup
    InstructionList prologue = new InstructionList();
    ConstantPoolGen prologueCP = mainMethod.getConstantPoolGen();
    Instruction instr;
    int idx;
    // add magic initializers to prologue sequence
    if (!analyzeBootMethod) {
        instr = new ICONST(0);
        prologue.append(instr);
        instr = new ICONST(0);
        prologue.append(instr);
        idx = prologueCP.addMethodref("com.jopdesign.sys.GC", "init", "(II)V");
        instr = new INVOKESTATIC(idx);
        prologue.append(instr);
    }
    // add class initializers
    for (ClassInfo clinit : clinits) {
        MemberID cSig = appInfo.getClinitSignature(clinit.getClassName());
        idx = prologueCP.addMethodref(cSig.getClassName(), cSig.getMemberName(), cSig.getDescriptor().toString());
        instr = new INVOKESTATIC(idx);
        prologue.append(instr);
    }
    if (analyzeBootMethod) {
        // Let's just analyze the full boot method, so that the callgraph-builder is happy.
        // Doing this after clinit, so that we have DFA infos on fields in JVMHelp.init()
        idx = prologueCP.addMethodref("com.jopdesign.sys.Startup", "boot", "()V");
        instr = new INVOKESTATIC(idx);
        prologue.append(instr);
    }
    // add main method
    instr = new ACONST_NULL();
    prologue.append(instr);
    idx = prologueCP.addMethodref(mainMethod.getClassName(), mainMethod.getShortName(), mainMethod.getDescriptor().toString());
    instr = new INVOKESTATIC(idx);
    prologue.append(instr);
    //      // invoke startMission() to ensure analysis of threads
    //      idx = prologueCP.addMethodref("joprt.RtThread", "startMission", "()V");
    //      instr = new INVOKESTATIC(idx);
    //      prologue.append(instr);
    instr = new NOP();
    prologue.append(instr);
    prologue.setPositions(true);
    // add prologue to program structure
    for (Iterator l = prologue.iterator(); l.hasNext(); ) {
        InstructionHandle handle = (InstructionHandle) l.next();
        statements.add(handle);
        if (handle.getInstruction() instanceof GOTO) {
            GOTO g = (GOTO) handle.getInstruction();
            flow.addEdge(new FlowEdge(handle, g.getTarget(), FlowEdge.NORMAL_EDGE));
        } else if (handle.getNext() != null) {
            flow.addEdge(new FlowEdge(handle, handle.getNext(), FlowEdge.NORMAL_EDGE));
        }
    }
    MemberID pSig = new MemberID(prologueName, Descriptor.parse(prologueSig));
    MethodInfo mi = mainMethod.getClassInfo().createMethod(pSig, null, prologue);
    mi.setAccessType(AccessType.ACC_PRIVATE);
    return mi;
}

Example 8 with ConstantPoolGen

use of org.apache.bcel.generic.ConstantPoolGen in project jop by jop-devel.

the class DescendingClassTraverser method visitConstantPool.

///////////////////////////////////////////////////////////////////
// Other methods to visit only parts of a class
///////////////////////////////////////////////////////////////////
public void visitConstantPool(ClassInfo classInfo) {
    ConstantPoolGen cpg = classInfo.getConstantPoolGen();
    if (visitor.visitConstantPoolGen(classInfo, cpg)) {
        bcelVisitor.setClassInfo(classInfo);
        for (int i = 1; i < cpg.getSize(); i++) {
            Constant c = cpg.getConstant(i);
            // Some entries might be null (continuation of previous entry)
            if (c == null)
                continue;
            c.accept(bcelVisitor);
        }
        visitor.finishConstantPoolGen(classInfo, cpg);
    }
}

Example 9 with ConstantPoolGen

use of org.apache.bcel.generic.ConstantPoolGen in project jop by jop-devel.

the class DescendingClassTraverser method visitConstant.

public void visitConstant(ClassInfo classInfo, int index) {
    ConstantPoolGen cpg = classInfo.getConstantPoolGen();
    visitConstant(classInfo, cpg.getConstant(index));
}

Example 10 with ConstantPoolGen

use of org.apache.bcel.generic.ConstantPoolGen in project jop by jop-devel.

the class ConstantPoolReferenceFinder method visitPoolReferences.

/**
     * Helper method which applies a visitor to all constants given by a set of ids.
     * @param classInfo the class containing the constant pool
     * @param visitor the visitor to apply
     * @param ids a set of ids of pool entries to visit
     */
private static void visitPoolReferences(ClassInfo classInfo, ClassElementVisitor visitor, Set<Integer> ids) {
    DescendingClassTraverser traverser = new DescendingClassTraverser(visitor);
    ConstantPoolGen cpg = classInfo.getConstantPoolGen();
    // iterate over the given pool entries, call the visitor
    for (Integer id : ids) {
        traverser.visitConstant(classInfo, cpg.getConstant(id));
    }
}