Examples with ExceptionWithContext org.jf.util.ExceptionWithContext used on opensource projects

Example 11 with ExceptionWithContext

use of org.jf.util.ExceptionWithContext in project smali by JesusFreke.

the class DexBackedMethodImplementation method getInstructions.

@Nonnull
@Override
public Iterable<? extends Instruction> getInstructions() {
    // instructionsSize is the number of 16-bit code units in the instruction list, not the number of instructions
    int instructionsSize = dexFile.readSmallUint(codeOffset + CodeItem.INSTRUCTION_COUNT_OFFSET);
    final int instructionsStartOffset = codeOffset + CodeItem.INSTRUCTION_START_OFFSET;
    final int endOffset = instructionsStartOffset + (instructionsSize * 2);
    return new Iterable<Instruction>() {

        @Override
        public Iterator<Instruction> iterator() {
            return new VariableSizeLookaheadIterator<Instruction>(dexFile, instructionsStartOffset) {

                @Override
                protected Instruction readNextItem(@Nonnull DexReader reader) {
                    if (reader.getOffset() >= endOffset) {
                        return endOfData();
                    }
                    Instruction instruction = DexBackedInstruction.readFrom(reader);
                    // Does the instruction extend past the end of the method?
                    int offset = reader.getOffset();
                    if (offset > endOffset || offset < 0) {
                        throw new ExceptionWithContext("The last instruction in method %s is truncated", method);
                    }
                    return instruction;
                }
            };
        }
    };
}

Example 12 with ExceptionWithContext

use of org.jf.util.ExceptionWithContext 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 ExceptionWithContext

use of org.jf.util.ExceptionWithContext in project smali by JesusFreke.

the class DexWriter method writeCodeItem.

private int writeCodeItem(@Nonnull DexDataWriter writer, @Nonnull ByteArrayOutputStream ehBuf, @Nonnull MethodKey methodKey, @Nonnull List<? extends TryBlock<? extends ExceptionHandler>> tryBlocks, @Nullable Iterable<? extends Instruction> instructions, int debugItemOffset) throws IOException {
    if (instructions == null && debugItemOffset == NO_OFFSET) {
        return -1;
    }
    numCodeItemItems++;
    writer.align();
    int codeItemOffset = writer.getPosition();
    writer.writeUshort(classSection.getRegisterCount(methodKey));
    boolean isStatic = AccessFlags.STATIC.isSet(classSection.getMethodAccessFlags(methodKey));
    Collection<? extends TypeKey> parameters = typeListSection.getTypes(protoSection.getParameters(methodSection.getPrototype(methodKey)));
    writer.writeUshort(MethodUtil.getParameterRegisterCount(parameters, isStatic));
    if (instructions != null) {
        tryBlocks = TryListBuilder.massageTryBlocks(tryBlocks);
        int outParamCount = 0;
        int codeUnitCount = 0;
        for (Instruction instruction : instructions) {
            codeUnitCount += instruction.getCodeUnits();
            if (instruction.getOpcode().referenceType == ReferenceType.METHOD) {
                ReferenceInstruction refInsn = (ReferenceInstruction) instruction;
                MethodReference methodRef = (MethodReference) refInsn.getReference();
                int paramCount = MethodUtil.getParameterRegisterCount(methodRef, InstructionUtil.isInvokeStatic(instruction.getOpcode()));
                if (paramCount > outParamCount) {
                    outParamCount = paramCount;
                }
            }
        }
        writer.writeUshort(outParamCount);
        writer.writeUshort(tryBlocks.size());
        writer.writeInt(debugItemOffset);
        InstructionWriter instructionWriter = InstructionWriter.makeInstructionWriter(opcodes, writer, stringSection, typeSection, fieldSection, methodSection, protoSection);
        writer.writeInt(codeUnitCount);
        int codeOffset = 0;
        for (Instruction instruction : instructions) {
            try {
                switch(instruction.getOpcode().format) {
                    case Format10t:
                        instructionWriter.write((Instruction10t) instruction);
                        break;
                    case Format10x:
                        instructionWriter.write((Instruction10x) instruction);
                        break;
                    case Format11n:
                        instructionWriter.write((Instruction11n) instruction);
                        break;
                    case Format11x:
                        instructionWriter.write((Instruction11x) instruction);
                        break;
                    case Format12x:
                        instructionWriter.write((Instruction12x) instruction);
                        break;
                    case Format20bc:
                        instructionWriter.write((Instruction20bc) instruction);
                        break;
                    case Format20t:
                        instructionWriter.write((Instruction20t) instruction);
                        break;
                    case Format21c:
                        instructionWriter.write((Instruction21c) instruction);
                        break;
                    case Format21ih:
                        instructionWriter.write((Instruction21ih) instruction);
                        break;
                    case Format21lh:
                        instructionWriter.write((Instruction21lh) instruction);
                        break;
                    case Format21s:
                        instructionWriter.write((Instruction21s) instruction);
                        break;
                    case Format21t:
                        instructionWriter.write((Instruction21t) instruction);
                        break;
                    case Format22b:
                        instructionWriter.write((Instruction22b) instruction);
                        break;
                    case Format22c:
                        instructionWriter.write((Instruction22c) instruction);
                        break;
                    case Format22s:
                        instructionWriter.write((Instruction22s) instruction);
                        break;
                    case Format22t:
                        instructionWriter.write((Instruction22t) instruction);
                        break;
                    case Format22x:
                        instructionWriter.write((Instruction22x) instruction);
                        break;
                    case Format23x:
                        instructionWriter.write((Instruction23x) instruction);
                        break;
                    case Format30t:
                        instructionWriter.write((Instruction30t) instruction);
                        break;
                    case Format31c:
                        instructionWriter.write((Instruction31c) instruction);
                        break;
                    case Format31i:
                        instructionWriter.write((Instruction31i) instruction);
                        break;
                    case Format31t:
                        instructionWriter.write((Instruction31t) instruction);
                        break;
                    case Format32x:
                        instructionWriter.write((Instruction32x) instruction);
                        break;
                    case Format35c:
                        instructionWriter.write((Instruction35c) instruction);
                        break;
                    case Format3rc:
                        instructionWriter.write((Instruction3rc) instruction);
                        break;
                    case Format45cc:
                        instructionWriter.write((Instruction45cc) instruction);
                        break;
                    case Format4rcc:
                        instructionWriter.write((Instruction4rcc) instruction);
                        break;
                    case Format51l:
                        instructionWriter.write((Instruction51l) instruction);
                        break;
                    case ArrayPayload:
                        instructionWriter.write((ArrayPayload) instruction);
                        break;
                    case PackedSwitchPayload:
                        instructionWriter.write((PackedSwitchPayload) instruction);
                        break;
                    case SparseSwitchPayload:
                        instructionWriter.write((SparseSwitchPayload) instruction);
                        break;
                    default:
                        throw new ExceptionWithContext("Unsupported instruction format: %s", instruction.getOpcode().format);
                }
            } catch (RuntimeException ex) {
                throw new ExceptionWithContext(ex, "Error while writing instruction at code offset 0x%x", codeOffset);
            }
            codeOffset += instruction.getCodeUnits();
        }
        if (tryBlocks.size() > 0) {
            writer.align();
            // filter out unique lists of exception handlers
            Map<List<? extends ExceptionHandler>, Integer> exceptionHandlerOffsetMap = Maps.newHashMap();
            for (TryBlock<? extends ExceptionHandler> tryBlock : tryBlocks) {
                exceptionHandlerOffsetMap.put(tryBlock.getExceptionHandlers(), 0);
            }
            DexDataWriter.writeUleb128(ehBuf, exceptionHandlerOffsetMap.size());
            for (TryBlock<? extends ExceptionHandler> tryBlock : tryBlocks) {
                int startAddress = tryBlock.getStartCodeAddress();
                int endAddress = startAddress + tryBlock.getCodeUnitCount();
                int tbCodeUnitCount = endAddress - startAddress;
                writer.writeInt(startAddress);
                writer.writeUshort(tbCodeUnitCount);
                if (tryBlock.getExceptionHandlers().size() == 0) {
                    throw new ExceptionWithContext("No exception handlers for the try block!");
                }
                Integer offset = exceptionHandlerOffsetMap.get(tryBlock.getExceptionHandlers());
                if (offset != 0) {
                    // exception handler has already been written out, just use it
                    writer.writeUshort(offset);
                } else {
                    // if offset has not been set yet, we are about to write out a new exception handler
                    offset = ehBuf.size();
                    writer.writeUshort(offset);
                    exceptionHandlerOffsetMap.put(tryBlock.getExceptionHandlers(), offset);
                    // check if the last exception handler is a catch-all and adjust the size accordingly
                    int ehSize = tryBlock.getExceptionHandlers().size();
                    ExceptionHandler ehLast = tryBlock.getExceptionHandlers().get(ehSize - 1);
                    if (ehLast.getExceptionType() == null) {
                        ehSize = ehSize * (-1) + 1;
                    }
                    // now let's layout the exception handlers, assuming that catch-all is always last
                    DexDataWriter.writeSleb128(ehBuf, ehSize);
                    for (ExceptionHandler eh : tryBlock.getExceptionHandlers()) {
                        TypeKey exceptionTypeKey = classSection.getExceptionType(eh);
                        int codeAddress = eh.getHandlerCodeAddress();
                        if (exceptionTypeKey != null) {
                            //regular exception handling
                            DexDataWriter.writeUleb128(ehBuf, typeSection.getItemIndex(exceptionTypeKey));
                            DexDataWriter.writeUleb128(ehBuf, codeAddress);
                        } else {
                            //catch-all
                            DexDataWriter.writeUleb128(ehBuf, codeAddress);
                        }
                    }
                }
            }
            if (ehBuf.size() > 0) {
                ehBuf.writeTo(writer);
                ehBuf.reset();
            }
        }
    } else {
        // no instructions, all we have is the debug item offset
        writer.writeUshort(0);
        writer.writeUshort(0);
        writer.writeInt(debugItemOffset);
        writer.writeInt(0);
    }
    return codeItemOffset;
}

Example 14 with ExceptionWithContext

use of org.jf.util.ExceptionWithContext 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());
            }
        }
    }
}