Examples with Reference org.jf.dexlib2.iface.reference.Reference used on opensource projects

Example 11 with Reference

use of org.jf.dexlib2.iface.reference.Reference in project smali by JesusFreke.

the class AnalyzedInstruction method setsRegister.

/**
     * Determines if this instruction sets the given register, or alters its type
     *
     * @param registerNumber The register to check
     * @return true if this instruction sets the given register or alters its type
     */
public boolean setsRegister(int registerNumber) {
    if (isInvokeInit()) {
        // When constructing a new object, the register type will be an uninitialized reference after the
        // new-instance instruction, but becomes an initialized reference once the <init> method is called. So even
        // though invoke instructions don't normally change any registers, calling an <init> method will change the
        // type of its object register. If the uninitialized reference has been copied to other registers, they will
        // be initialized as well, so we need to check for that too
        int destinationRegister;
        if (instruction instanceof FiveRegisterInstruction) {
            assert ((FiveRegisterInstruction) instruction).getRegisterCount() > 0;
            destinationRegister = ((FiveRegisterInstruction) instruction).getRegisterC();
        } else {
            assert instruction instanceof RegisterRangeInstruction;
            RegisterRangeInstruction rangeInstruction = (RegisterRangeInstruction) instruction;
            assert rangeInstruction.getRegisterCount() > 0;
            destinationRegister = rangeInstruction.getStartRegister();
        }
        RegisterType preInstructionDestRegisterType = getPreInstructionRegisterType(destinationRegister);
        if (preInstructionDestRegisterType.category == RegisterType.UNKNOWN) {
            // We never let an uninitialized reference propagate past an invoke-init if the object register type is
            // unknown This is because the uninitialized reference may be an alias to the reference being
            // initialized, but we can't know that until the object register's type is known
            RegisterType preInstructionRegisterType = getPreInstructionRegisterType(registerNumber);
            if (preInstructionRegisterType.category == RegisterType.UNINIT_REF || preInstructionRegisterType.category == RegisterType.UNINIT_THIS) {
                return true;
            }
        }
        if (preInstructionDestRegisterType.category != RegisterType.UNINIT_REF && preInstructionDestRegisterType.category != RegisterType.UNINIT_THIS) {
            return false;
        }
        if (registerNumber == destinationRegister) {
            return true;
        }
        //check if the uninit ref has been copied to another register
        return preInstructionDestRegisterType.equals(getPreInstructionRegisterType(registerNumber));
    }
    // branch of the following if-eqz/if-nez
    if (instructionIndex > 0 && methodAnalyzer.getClassPath().isArt() && getPredecessorCount() == 1 && (instruction.getOpcode() == Opcode.IF_EQZ || instruction.getOpcode() == Opcode.IF_NEZ)) {
        AnalyzedInstruction prevInstruction = predecessors.first();
        if (prevInstruction.instruction.getOpcode() == Opcode.INSTANCE_OF && MethodAnalyzer.canPropagateTypeAfterInstanceOf(prevInstruction, this, methodAnalyzer.getClassPath())) {
            Instruction22c instanceOfInstruction = (Instruction22c) prevInstruction.instruction;
            if (registerNumber == instanceOfInstruction.getRegisterB()) {
                return true;
            }
            // TODO: do we need to do some sort of additional check that these multiple move-object predecessors actually refer to the same value?
            if (instructionIndex > 1) {
                int originalSourceRegister = -1;
                RegisterType newType = null;
                for (AnalyzedInstruction prevPrevAnalyzedInstruction : prevInstruction.predecessors) {
                    Opcode opcode = prevPrevAnalyzedInstruction.instruction.getOpcode();
                    if (opcode == Opcode.MOVE_OBJECT || opcode == Opcode.MOVE_OBJECT_16 || opcode == Opcode.MOVE_OBJECT_FROM16) {
                        TwoRegisterInstruction moveInstruction = ((TwoRegisterInstruction) prevPrevAnalyzedInstruction.instruction);
                        RegisterType originalType = prevPrevAnalyzedInstruction.getPostInstructionRegisterType(moveInstruction.getRegisterB());
                        if (moveInstruction.getRegisterA() != instanceOfInstruction.getRegisterB()) {
                            originalSourceRegister = -1;
                            break;
                        }
                        if (originalType.type == null) {
                            originalSourceRegister = -1;
                            break;
                        }
                        if (newType == null) {
                            newType = RegisterType.getRegisterType(methodAnalyzer.getClassPath(), (TypeReference) instanceOfInstruction.getReference());
                        }
                        if (MethodAnalyzer.isNotWideningConversion(originalType, newType)) {
                            if (originalSourceRegister != -1) {
                                if (originalSourceRegister != moveInstruction.getRegisterB()) {
                                    originalSourceRegister = -1;
                                    break;
                                }
                            } else {
                                originalSourceRegister = moveInstruction.getRegisterB();
                            }
                        }
                    } else {
                        originalSourceRegister = -1;
                        break;
                    }
                }
                if (originalSourceRegister != -1 && registerNumber == originalSourceRegister) {
                    return true;
                }
            }
        }
    }
    if (!instruction.getOpcode().setsRegister()) {
        return false;
    }
    int destinationRegister = getDestinationRegister();
    if (registerNumber == destinationRegister) {
        return true;
    }
    if (instruction.getOpcode().setsWideRegister() && registerNumber == (destinationRegister + 1)) {
        return true;
    }
    return false;
}

Example 12 with Reference

use of org.jf.dexlib2.iface.reference.Reference in project smali by JesusFreke.

the class InstructionMethodItem method writeTo.

@Override
public boolean writeTo(IndentingWriter writer) throws IOException {
    Opcode opcode = instruction.getOpcode();
    String verificationErrorName = null;
    String referenceString = null;
    String referenceString2 = null;
    boolean commentOutInstruction = false;
    if (instruction instanceof Instruction20bc) {
        int verificationError = ((Instruction20bc) instruction).getVerificationError();
        verificationErrorName = VerificationError.getVerificationErrorName(verificationError);
        if (verificationErrorName == null) {
            writer.write("#was invalid verification error type: ");
            writer.printSignedIntAsDec(verificationError);
            writer.write("\n");
            verificationErrorName = "generic-error";
        }
    }
    if (instruction instanceof ReferenceInstruction) {
        ReferenceInstruction referenceInstruction = (ReferenceInstruction) instruction;
        String classContext = null;
        if (methodDef.classDef.options.implicitReferences) {
            classContext = methodDef.method.getDefiningClass();
        }
        try {
            Reference reference = referenceInstruction.getReference();
            referenceString = ReferenceUtil.getReferenceString(reference, classContext);
            assert referenceString != null;
        } catch (InvalidItemIndex ex) {
            commentOutInstruction = true;
            referenceString = writeInvalidItemIndex(ex, referenceInstruction.getReferenceType(), writer);
        } catch (ReferenceType.InvalidReferenceTypeException ex) {
            writer.write("#invalid reference type: ");
            writer.printSignedIntAsDec(ex.getReferenceType());
            commentOutInstruction = true;
            referenceString = "invalid_reference";
        }
        if (instruction instanceof DualReferenceInstruction) {
            DualReferenceInstruction dualReferenceInstruction = (DualReferenceInstruction) instruction;
            try {
                Reference reference2 = dualReferenceInstruction.getReference2();
                referenceString2 = ReferenceUtil.getReferenceString(reference2, classContext);
            } catch (InvalidItemIndex ex) {
                commentOutInstruction = true;
                referenceString2 = writeInvalidItemIndex(ex, dualReferenceInstruction.getReferenceType2(), writer);
            } catch (ReferenceType.InvalidReferenceTypeException ex) {
                writer.write("#invalid reference type: ");
                writer.printSignedIntAsDec(ex.getReferenceType());
                commentOutInstruction = true;
                referenceString2 = "invalid_reference";
            }
        }
    }
    if (instruction instanceof Instruction31t) {
        boolean validPayload = true;
        switch(instruction.getOpcode()) {
            case PACKED_SWITCH:
                int baseAddress = methodDef.getPackedSwitchBaseAddress(this.codeAddress + ((Instruction31t) instruction).getCodeOffset());
                if (baseAddress == -1) {
                    validPayload = false;
                }
                break;
            case SPARSE_SWITCH:
                baseAddress = methodDef.getSparseSwitchBaseAddress(this.codeAddress + ((Instruction31t) instruction).getCodeOffset());
                if (baseAddress == -1) {
                    validPayload = false;
                }
                break;
            case FILL_ARRAY_DATA:
                try {
                    methodDef.findPayloadOffset(this.codeAddress + ((Instruction31t) instruction).getCodeOffset(), Opcode.ARRAY_PAYLOAD);
                } catch (InvalidSwitchPayload ex) {
                    validPayload = false;
                }
                break;
            default:
                throw new ExceptionWithContext("Invalid 31t opcode: %s", instruction.getOpcode());
        }
        if (!validPayload) {
            writer.write("#invalid payload reference\n");
            commentOutInstruction = true;
        }
    }
    if (opcode.odexOnly()) {
        if (!isAllowedOdex(opcode)) {
            writer.write("#disallowed odex opcode\n");
            commentOutInstruction = true;
        }
    }
    if (commentOutInstruction) {
        writer.write("#");
    }
    switch(instruction.getOpcode().format) {
        case Format10t:
            writeOpcode(writer);
            writer.write(' ');
            writeTargetLabel(writer);
            break;
        case Format10x:
            if (instruction instanceof UnknownInstruction) {
                writer.write("#unknown opcode: 0x");
                writer.printUnsignedLongAsHex(((UnknownInstruction) instruction).getOriginalOpcode());
                writer.write('\n');
            }
            writeOpcode(writer);
            break;
        case Format11n:
            writeOpcode(writer);
            writer.write(' ');
            writeFirstRegister(writer);
            writer.write(", ");
            writeLiteral(writer);
            break;
        case Format11x:
            writeOpcode(writer);
            writer.write(' ');
            writeFirstRegister(writer);
            break;
        case Format12x:
            writeOpcode(writer);
            writer.write(' ');
            writeFirstRegister(writer);
            writer.write(", ");
            writeSecondRegister(writer);
            break;
        case Format20bc:
            writeOpcode(writer);
            writer.write(' ');
            writer.write(verificationErrorName);
            writer.write(", ");
            writer.write(referenceString);
            break;
        case Format20t:
        case Format30t:
            writeOpcode(writer);
            writer.write(' ');
            writeTargetLabel(writer);
            break;
        case Format21c:
        case Format31c:
            writeOpcode(writer);
            writer.write(' ');
            writeFirstRegister(writer);
            writer.write(", ");
            writer.write(referenceString);
            break;
        case Format21ih:
        case Format21lh:
        case Format21s:
        case Format31i:
        case Format51l:
            writeOpcode(writer);
            writer.write(' ');
            writeFirstRegister(writer);
            writer.write(", ");
            writeLiteral(writer);
            if (instruction.getOpcode().setsWideRegister()) {
                writeCommentIfLikelyDouble(writer);
            } else {
                boolean isResourceId = writeCommentIfResourceId(writer);
                if (!isResourceId)
                    writeCommentIfLikelyFloat(writer);
            }
            break;
        case Format21t:
        case Format31t:
            writeOpcode(writer);
            writer.write(' ');
            writeFirstRegister(writer);
            writer.write(", ");
            writeTargetLabel(writer);
            break;
        case Format22b:
        case Format22s:
            writeOpcode(writer);
            writer.write(' ');
            writeFirstRegister(writer);
            writer.write(", ");
            writeSecondRegister(writer);
            writer.write(", ");
            writeLiteral(writer);
            break;
        case Format22c:
            writeOpcode(writer);
            writer.write(' ');
            writeFirstRegister(writer);
            writer.write(", ");
            writeSecondRegister(writer);
            writer.write(", ");
            writer.write(referenceString);
            break;
        case Format22cs:
            writeOpcode(writer);
            writer.write(' ');
            writeFirstRegister(writer);
            writer.write(", ");
            writeSecondRegister(writer);
            writer.write(", ");
            writeFieldOffset(writer);
            break;
        case Format22t:
            writeOpcode(writer);
            writer.write(' ');
            writeFirstRegister(writer);
            writer.write(", ");
            writeSecondRegister(writer);
            writer.write(", ");
            writeTargetLabel(writer);
            break;
        case Format22x:
        case Format32x:
            writeOpcode(writer);
            writer.write(' ');
            writeFirstRegister(writer);
            writer.write(", ");
            writeSecondRegister(writer);
            break;
        case Format23x:
            writeOpcode(writer);
            writer.write(' ');
            writeFirstRegister(writer);
            writer.write(", ");
            writeSecondRegister(writer);
            writer.write(", ");
            writeThirdRegister(writer);
            break;
        case Format35c:
            writeOpcode(writer);
            writer.write(' ');
            writeInvokeRegisters(writer);
            writer.write(", ");
            writer.write(referenceString);
            break;
        case Format35mi:
            writeOpcode(writer);
            writer.write(' ');
            writeInvokeRegisters(writer);
            writer.write(", ");
            writeInlineIndex(writer);
            break;
        case Format35ms:
            writeOpcode(writer);
            writer.write(' ');
            writeInvokeRegisters(writer);
            writer.write(", ");
            writeVtableIndex(writer);
            break;
        case Format3rc:
            writeOpcode(writer);
            writer.write(' ');
            writeInvokeRangeRegisters(writer);
            writer.write(", ");
            writer.write(referenceString);
            break;
        case Format3rmi:
            writeOpcode(writer);
            writer.write(' ');
            writeInvokeRangeRegisters(writer);
            writer.write(", ");
            writeInlineIndex(writer);
            break;
        case Format3rms:
            writeOpcode(writer);
            writer.write(' ');
            writeInvokeRangeRegisters(writer);
            writer.write(", ");
            writeVtableIndex(writer);
            break;
        case Format45cc:
            writeOpcode(writer);
            writer.write(' ');
            writeInvokeRegisters(writer);
            writer.write(", ");
            writer.write(referenceString);
            writer.write(", ");
            writer.write(referenceString2);
            break;
        case Format4rcc:
            writeOpcode(writer);
            writer.write(' ');
            writeInvokeRangeRegisters(writer);
            writer.write(", ");
            writer.write(referenceString);
            writer.write(", ");
            writer.write(referenceString2);
            break;
        default:
            assert false;
            return false;
    }
    if (commentOutInstruction) {
        writer.write("\nnop");
    }
    return true;
}

Example 13 with Reference

use of org.jf.dexlib2.iface.reference.Reference in project smali by JesusFreke.

the class ClassPool method internCode.

private void internCode(@Nonnull Method method) {
    // this also handles parameter names, which aren't directly tied to the MethodImplementation, even though the debug items are
    boolean hasInstruction = false;
    MethodImplementation methodImpl = method.getImplementation();
    if (methodImpl != null) {
        for (Instruction instruction : methodImpl.getInstructions()) {
            hasInstruction = true;
            if (instruction instanceof ReferenceInstruction) {
                Reference reference = ((ReferenceInstruction) instruction).getReference();
                switch(instruction.getOpcode().referenceType) {
                    case ReferenceType.STRING:
                        dexPool.stringSection.intern((StringReference) reference);
                        break;
                    case ReferenceType.TYPE:
                        dexPool.typeSection.intern((TypeReference) reference);
                        break;
                    case ReferenceType.FIELD:
                        dexPool.fieldSection.intern((FieldReference) reference);
                        break;
                    case ReferenceType.METHOD:
                        dexPool.methodSection.intern((MethodReference) reference);
                        break;
                    default:
                        throw new ExceptionWithContext("Unrecognized reference type: %d", instruction.getOpcode().referenceType);
                }
            }
        }
        List<? extends TryBlock> tryBlocks = methodImpl.getTryBlocks();
        if (!hasInstruction && tryBlocks.size() > 0) {
            throw new ExceptionWithContext("Method %s has no instructions, but has try blocks.", ReferenceUtil.getMethodDescriptor(method));
        }
        for (TryBlock<? extends ExceptionHandler> tryBlock : methodImpl.getTryBlocks()) {
            for (ExceptionHandler handler : tryBlock.getExceptionHandlers()) {
                dexPool.typeSection.internNullable(handler.getExceptionType());
            }
        }
    }
}