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

Example 6 with MethodGen

use of org.apache.bcel.generic.MethodGen in project candle-decompiler by bradsdavis.

the class ClassIntermediateVisitor method visitMethod.

@Override
public void visitMethod(Method obj) {
    MethodGen methodGenerator = new MethodGen(obj, this.javaClass.getClassName(), this.constantPool);
    LOG.debug("Processing MethodInvocation: " + methodGenerator.toString());
    IntermediateContext intermediateContext = new IntermediateContext(this.javaClass, methodGenerator);
    InstructionList instructions = methodGenerator.getInstructionList();
    instructions.setPositions(true);
    InstructionGraphFactory igf = new InstructionGraphFactory(instructions, methodGenerator.getExceptionHandlers());
    InstructionGraphContext igc = igf.process();
    List<InstructionGraphEnhancer> iges = new ArrayList<InstructionGraphEnhancer>();
    iges.add(new InstructionGraphWriter(igc, "before.dot"));
    iges.add(new SplitInstructionEnhancer(igc));
    iges.add(new ConditionEdgeEnhancer(igc));
    iges.add(new ExceptionEdgeEnhancer(igc, methodGenerator.getExceptionHandlers()));
    iges.add(new InstructionToIntermediateEnhancer(igc, intermediateContext));
    iges.add(new BackEdgeEnhancer(igc));
    iges.add(new LoopHeader(igc));
    iges.add(new ContinuousLoop(igc));
    iges.add(new NonIntermediateEliminator(igc));
    iges.add(new InstructionGraphWriter(igc, "after.dot"));
    for (InstructionGraphEnhancer ige : iges) {
        ige.process();
    }
    IntermediateGraphTransformer igt = new IntermediateGraphTransformer(igc);
    IntermediateGraphContext interGraphContext = igt.getIntermediateGraphContext();
    processIntermediate(interGraphContext);
    MethodBlock method = extractMethodSignature(methodGenerator);
    BlockVisitor iv = new BlockVisitor(interGraphContext, method);
    iv.process();
    classBlock.addChild(method);
    method.setParent(classBlock);
}

Example 7 with MethodGen

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

the class FindUsedConstants method find.

private void find(Method method) {
    MethodGen mg = new MethodGen(method, clazz.getClassName(), cpool);
    InstructionList il = mg.getInstructionList();
    InstructionFinder f = new InstructionFinder(il);
    // find instructions that access the constant pool
    // collect all indices to constants in ClassInfo
    String cpInstr = "CPInstruction";
    for (Iterator it = f.search(cpInstr); it.hasNext(); ) {
        InstructionHandle[] match = (InstructionHandle[]) it.next();
        InstructionHandle first = match[0];
        CPInstruction ii = (CPInstruction) first.getInstruction();
        int idx = ii.getIndex();
        Constant co = cpool.getConstant(idx);
        int len = 1;
        switch(co.getTag()) {
            case Constants.CONSTANT_Long:
            case Constants.CONSTANT_Double:
                len = 2;
                break;
        }
        // we don't need the field references in the cpool anymore
        if (co.getTag() != Constants.CONSTANT_Fieldref) {
            getCli().addUsedConst(idx, len);
        }
    // also modify the index!
    //			Constant cnst = cpool.getConstant(ii.getIndex());
    //			int newIndex = addConstant(cnst);
    //System.out.println(ii+" -> "+newIndex);
    //			ii.setIndex(newIndex);			
    }
    il.dispose();
    CodeExceptionGen[] et = mg.getExceptionHandlers();
    for (int i = 0; i < et.length; i++) {
        ObjectType ctype = et[i].getCatchType();
        if (ctype != null) {
            getCli().addUsedConst(cpool.lookupClass(ctype.getClassName()), 1);
        }
    }
}

Example 8 with MethodGen

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

the class ReplaceNativeAndCPIdx method replace.

private Method replace(Method method) {
    MethodGen mg = new MethodGen(method, clazz.getClassName(), cpoolgen);
    InstructionList il = mg.getInstructionList();
    InstructionFinder f = new InstructionFinder(il);
    String methodId = method.getName() + method.getSignature();
    OldMethodInfo mi = getCli().getMethodInfo(methodId);
    // find invokes first and replace call to Native by
    // JOP native instructions.
    String invokeStr = "InvokeInstruction";
    for (Iterator i = f.search(invokeStr); i.hasNext(); ) {
        InstructionHandle[] match = (InstructionHandle[]) i.next();
        InstructionHandle first = match[0];
        InvokeInstruction ii = (InvokeInstruction) first.getInstruction();
        if (ii.getClassName(cpoolgen).equals(JOPizer.nativeClass)) {
            short opid = (short) JopInstr.getNative(ii.getMethodName(cpoolgen));
            if (opid == -1) {
                System.err.println(method.getName() + ": cannot locate " + ii.getMethodName(cpoolgen) + ". Replacing with NOP.");
                first.setInstruction(new NOP());
            } else {
                first.setInstruction(new NativeInstruction(opid, (short) 1));
                ((JOPizer) ai).outTxt.println("\t" + first.getPosition());
                // then we remove pc+2 and pc+1 from the MGCI info
                if (JOPizer.dumpMgci) {
                    il.setPositions();
                    int pc = first.getPosition();
                    // important: take the high one first
                    GCRTMethodInfo.removePC(pc + 2, mi);
                    GCRTMethodInfo.removePC(pc + 1, mi);
                }
            }
        }
        if (ii instanceof INVOKESPECIAL) {
            // not an initializer
            if (!ii.getMethodName(cpoolgen).equals("<init>")) {
                // check if this is a super invoke
                // TODO this is just a hack, use InvokeSite.isInvokeSuper() when this is ported to the new framework!
                boolean isSuper = false;
                String declaredType = ii.getClassName(cpoolgen);
                JopClassInfo cls = getCli();
                OldClassInfo superClass = cls.superClass;
                while (superClass != null) {
                    if (superClass.clazz.getClassName().equals(declaredType)) {
                        isSuper = true;
                        break;
                    }
                    if ("java.lang.Object".equals(superClass.clazz.getClassName())) {
                        break;
                    }
                    superClass = superClass.superClass;
                }
                if (isSuper) {
                    Integer idx = ii.getIndex();
                    int new_index = getCli().cpoolUsed.indexOf(idx) + 1;
                    first.setInstruction(new JOPSYS_INVOKESUPER((short) new_index));
                // System.err.println("invokesuper "+ii.getClassName(cpoolgen)+"."+ii.getMethodName(cpoolgen));
                }
            }
        }
    }
    if (JOPizer.CACHE_INVAL) {
        f = new InstructionFinder(il);
        // find volatile reads and insert cache invalidation bytecode
        String fieldInstr = "GETFIELD|GETSTATIC|PUTFIELD|PUTSTATIC";
        for (Iterator i = f.search(fieldInstr); i.hasNext(); ) {
            InstructionHandle[] match = (InstructionHandle[]) i.next();
            InstructionHandle ih = match[0];
            FieldInstruction fi = (FieldInstruction) ih.getInstruction();
            JavaClass jc = JOPizer.jz.cliMap.get(fi.getClassName(cpoolgen)).clazz;
            Field field = null;
            while (field == null) {
                Field[] fields = jc.getFields();
                for (int k = 0; k < fields.length; k++) {
                    if (fields[k].getName().equals(fi.getFieldName(cpoolgen))) {
                        field = fields[k];
                        break;
                    }
                }
                if (field == null) {
                    try {
                        jc = jc.getSuperClass();
                    } catch (ClassNotFoundException e) {
                        e.printStackTrace();
                        throw new Error();
                    }
                }
            }
            if (field.isVolatile()) {
                if (field.getType().getSize() < 2) {
                    if (fi instanceof GETFIELD || fi instanceof GETSTATIC) {
                        ih.setInstruction(new InvalidateInstruction());
                        ih = il.append(ih, fi);
                    }
                } else {
                    // this only works because we do not throw a
                    // NullPointerException for monitorenter/-exit!
                    ih.setInstruction(new ACONST_NULL());
                    ih = il.append(ih, new MONITORENTER());
                    ih = il.append(ih, fi);
                    ih = il.append(ih, new ACONST_NULL());
                    ih = il.append(ih, new MONITOREXIT());
                }
            }
        }
    }
    f = new InstructionFinder(il);
    // find instructions that access the constant pool
    // and replace the index by the new value from ClassInfo
    String cpInstr = "CPInstruction";
    for (Iterator it = f.search(cpInstr); it.hasNext(); ) {
        InstructionHandle[] match = (InstructionHandle[]) it.next();
        InstructionHandle ih = match[0];
        CPInstruction cpii = (CPInstruction) ih.getInstruction();
        int index = cpii.getIndex();
        // we have to grab the information before we change
        // the CP index.
        FieldInstruction fi = null;
        Type ft = null;
        if (cpii instanceof FieldInstruction) {
            fi = (FieldInstruction) ih.getInstruction();
            ft = fi.getFieldType(cpoolgen);
        }
        Integer idx = new Integer(index);
        // pos is the new position in the reduced constant pool
        // idx is the position in the 'original' unresolved cpool
        int pos = getCli().cpoolUsed.indexOf(idx);
        int new_index = pos + 1;
        // and putfield and by address for getstatic and putstatic
        if (cpii instanceof GETFIELD || cpii instanceof PUTFIELD || cpii instanceof GETSTATIC || cpii instanceof PUTSTATIC) {
            // we use the offset instead of the CP index
            new_index = getFieldOffset(cp, index);
        } else {
            if (pos == -1) {
                System.out.println("Error: constant " + index + " " + cpoolgen.getConstant(index) + " not found");
                System.out.println("new cpool: " + getCli().cpoolUsed);
                System.out.println("original cpool: " + cpoolgen);
                System.exit(-1);
            }
        }
        // set new index, position starts at
        // 1 as cp points to the length of the pool
        cpii.setIndex(new_index);
        if (cpii instanceof FieldInstruction) {
            boolean isRef = ft instanceof ReferenceType;
            boolean isLong = ft == BasicType.LONG || ft == BasicType.DOUBLE;
            if (fi instanceof GETSTATIC) {
                if (isRef) {
                    ih.setInstruction(new GETSTATIC_REF((short) new_index));
                } else if (isLong) {
                    ih.setInstruction(new GETSTATIC_LONG((short) new_index));
                }
            } else if (fi instanceof PUTSTATIC) {
                if (isRef) {
                    if (!com.jopdesign.build.JOPizer.USE_RTTM) {
                        ih.setInstruction(new PUTSTATIC_REF((short) new_index));
                    }
                } else if (isLong) {
                    ih.setInstruction(new PUTSTATIC_LONG((short) new_index));
                }
            } else if (fi instanceof GETFIELD) {
                if (isRef) {
                    ih.setInstruction(new GETFIELD_REF((short) new_index));
                } else if (isLong) {
                    ih.setInstruction(new GETFIELD_LONG((short) new_index));
                }
            } else if (fi instanceof PUTFIELD) {
                if (isRef) {
                    if (!com.jopdesign.build.JOPizer.USE_RTTM) {
                        ih.setInstruction(new PUTFIELD_REF((short) new_index));
                    }
                } else if (isLong) {
                    ih.setInstruction(new PUTFIELD_LONG((short) new_index));
                }
            }
        }
    }
    Method m = mg.getMethod();
    il.dispose();
    return m;
}

Example 9 with MethodGen

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

the class ClassInfo method createMethod.

/**
     * Create a new non-static, package-visible method with the given name and descriptor.
     *
     * @param memberID the membername and descriptor of the method (classname is ignored).
     * @param argNames the names of the parameters
     * @param code an InstructionList to set to the method as code, or if null, create an abstract method.
     * @return the new method or an existing method with that memberID.
     */
public MethodInfo createMethod(MemberID memberID, String[] argNames, InstructionList code) {
    MethodInfo method = methods.get(memberID.getMethodSignature());
    if (method != null) {
        method.setAbstract(code == null);
        if (code != null) {
            method.getCode().setInstructionList(code);
        }
        return method;
    }
    Descriptor desc = memberID.getDescriptor();
    int flags = (code == null) ? Constants.ACC_ABSTRACT : 0;
    method = new MethodInfo(this, new MethodGen(flags, desc.getType(), desc.getArgumentTypes(), argNames, memberID.getMemberName(), classGen.getClassName(), code, cpg));
    methods.put(memberID.getMethodSignature(), method);
    classGen.addMethod(method.getMethod(false));
    return method;
}