Examples with RegisterSpec com.android.dx.rop.code.RegisterSpec used on opensource projects

Example 21 with RegisterSpec

use of com.android.dx.rop.code.RegisterSpec in project buck by facebook.

the class FirstFitLocalCombiningAllocator method handleNormalUnassociated.

/**
     * Maps all non-parameter, non-local variable registers.
     */
private void handleNormalUnassociated() {
    int szSsaRegs = ssaMeth.getRegCount();
    for (int ssaReg = 0; ssaReg < szSsaRegs; ssaReg++) {
        if (ssaRegsMapped.get(ssaReg)) {
            // We already did this one
            continue;
        }
        RegisterSpec ssaSpec = getDefinitionSpecForSsaReg(ssaReg);
        if (ssaSpec == null)
            continue;
        int category = ssaSpec.getCategory();
        // Find a rop reg that does not interfere
        int ropReg = findNextUnreservedRopReg(paramRangeEnd, category);
        while (!canMapReg(ssaSpec, ropReg)) {
            ropReg = findNextUnreservedRopReg(ropReg + 1, category);
        }
        addMapping(ssaSpec, ropReg);
    }
}

Example 22 with RegisterSpec

use of com.android.dx.rop.code.RegisterSpec in project buck by facebook.

the class RopperMachine method run.

/** {@inheritDoc} */
@Override
public void run(Frame frame, int offset, int opcode) {
    /*
         * This is the stack pointer after the opcode's arguments have been
         * popped.
         */
    int stackPointer = maxLocals + frame.getStack().size();
    // The sources have to be retrieved before super.run() gets called.
    RegisterSpecList sources = getSources(opcode, stackPointer);
    int sourceCount = sources.size();
    super.run(frame, offset, opcode);
    SourcePosition pos = method.makeSourcePosistion(offset);
    RegisterSpec localTarget = getLocalTarget(opcode == ByteOps.ISTORE);
    int destCount = resultCount();
    RegisterSpec dest;
    if (destCount == 0) {
        dest = null;
        switch(opcode) {
            case ByteOps.POP:
            case ByteOps.POP2:
                {
                    // These simply don't appear in the rop form.
                    return;
                }
        }
    } else if (localTarget != null) {
        dest = localTarget;
    } else if (destCount == 1) {
        dest = RegisterSpec.make(stackPointer, result(0));
    } else {
        /*
             * This clause only ever applies to the stack manipulation
             * ops that have results (that is, dup* and swap but not
             * pop*).
             *
             * What we do is first move all the source registers into
             * the "temporary stack" area defined for the method, and
             * then move stuff back down onto the main "stack" in the
             * arrangement specified by the stack op pattern.
             *
             * Note: This code ends up emitting a lot of what will
             * turn out to be superfluous moves (e.g., moving back and
             * forth to the same local when doing a dup); however,
             * that makes this code a bit easier (and goodness knows
             * it doesn't need any extra complexity), and all the SSA
             * stuff is going to want to deal with this sort of
             * superfluous assignment anyway, so it should be a wash
             * in the end.
             */
        int scratchAt = ropper.getFirstTempStackReg();
        RegisterSpec[] scratchRegs = new RegisterSpec[sourceCount];
        for (int i = 0; i < sourceCount; i++) {
            RegisterSpec src = sources.get(i);
            TypeBearer type = src.getTypeBearer();
            RegisterSpec scratch = src.withReg(scratchAt);
            insns.add(new PlainInsn(Rops.opMove(type), pos, scratch, src));
            scratchRegs[i] = scratch;
            scratchAt += src.getCategory();
        }
        for (int pattern = getAuxInt(); pattern != 0; pattern >>= 4) {
            int which = (pattern & 0x0f) - 1;
            RegisterSpec scratch = scratchRegs[which];
            TypeBearer type = scratch.getTypeBearer();
            insns.add(new PlainInsn(Rops.opMove(type), pos, scratch.withReg(stackPointer), scratch));
            stackPointer += type.getType().getCategory();
        }
        return;
    }
    TypeBearer destType = (dest != null) ? dest : Type.VOID;
    Constant cst = getAuxCst();
    int ropOpcode;
    Rop rop;
    Insn insn;
    if (opcode == ByteOps.MULTIANEWARRAY) {
        blockCanThrow = true;
        // Add the extra instructions for handling multianewarray.
        extraBlockCount = 6;
        /*
             * Add an array constructor for the int[] containing all the
             * dimensions.
             */
        RegisterSpec dimsReg = RegisterSpec.make(dest.getNextReg(), Type.INT_ARRAY);
        rop = Rops.opFilledNewArray(Type.INT_ARRAY, sourceCount);
        insn = new ThrowingCstInsn(rop, pos, sources, catches, CstType.INT_ARRAY);
        insns.add(insn);
        // Add a move-result for the new-filled-array
        rop = Rops.opMoveResult(Type.INT_ARRAY);
        insn = new PlainInsn(rop, pos, dimsReg, RegisterSpecList.EMPTY);
        insns.add(insn);
        /*
             * Add a const-class instruction for the specified array
             * class.
             */
        /*
             * Remove as many dimensions from the originally specified
             * class as are given in the explicit list of dimensions,
             * so as to pass the right component class to the standard
             * Java library array constructor.
             */
        Type componentType = ((CstType) cst).getClassType();
        for (int i = 0; i < sourceCount; i++) {
            componentType = componentType.getComponentType();
        }
        RegisterSpec classReg = RegisterSpec.make(dest.getReg(), Type.CLASS);
        if (componentType.isPrimitive()) {
            /*
                 * The component type is primitive (e.g., int as opposed
                 * to Integer), so we have to fetch the corresponding
                 * TYPE class.
                 */
            CstFieldRef typeField = CstFieldRef.forPrimitiveType(componentType);
            insn = new ThrowingCstInsn(Rops.GET_STATIC_OBJECT, pos, RegisterSpecList.EMPTY, catches, typeField);
        } else {
            /*
                 * The component type is an object type, so just make a
                 * normal class reference.
                 */
            insn = new ThrowingCstInsn(Rops.CONST_OBJECT, pos, RegisterSpecList.EMPTY, catches, new CstType(componentType));
        }
        insns.add(insn);
        // Add a move-result-pseudo for the get-static or const
        rop = Rops.opMoveResultPseudo(classReg.getType());
        insn = new PlainInsn(rop, pos, classReg, RegisterSpecList.EMPTY);
        insns.add(insn);
        /*
             * Add a call to the "multianewarray method," that is,
             * Array.newInstance(class, dims). Note: The result type
             * of newInstance() is Object, which is why the last
             * instruction in this sequence is a cast to the right
             * type for the original instruction.
             */
        RegisterSpec objectReg = RegisterSpec.make(dest.getReg(), Type.OBJECT);
        insn = new ThrowingCstInsn(Rops.opInvokeStatic(MULTIANEWARRAY_METHOD.getPrototype()), pos, RegisterSpecList.make(classReg, dimsReg), catches, MULTIANEWARRAY_METHOD);
        insns.add(insn);
        // Add a move-result.
        rop = Rops.opMoveResult(MULTIANEWARRAY_METHOD.getPrototype().getReturnType());
        insn = new PlainInsn(rop, pos, objectReg, RegisterSpecList.EMPTY);
        insns.add(insn);
        /*
             * And finally, set up for the remainder of this method to
             * add an appropriate cast.
             */
        opcode = ByteOps.CHECKCAST;
        sources = RegisterSpecList.make(objectReg);
    } else if (opcode == ByteOps.JSR) {
        // JSR has no Rop instruction
        hasJsr = true;
        return;
    } else if (opcode == ByteOps.RET) {
        try {
            returnAddress = (ReturnAddress) arg(0);
        } catch (ClassCastException ex) {
            throw new RuntimeException("Argument to RET was not a ReturnAddress", ex);
        }
        // RET has no Rop instruction.
        return;
    }
    ropOpcode = jopToRopOpcode(opcode, cst);
    rop = Rops.ropFor(ropOpcode, destType, sources, cst);
    Insn moveResult = null;
    if (dest != null && rop.isCallLike()) {
        /*
             * We're going to want to have a move-result in the next
             * basic block.
             */
        extraBlockCount++;
        moveResult = new PlainInsn(Rops.opMoveResult(((CstMethodRef) cst).getPrototype().getReturnType()), pos, dest, RegisterSpecList.EMPTY);
        dest = null;
    } else if (dest != null && rop.canThrow()) {
        /*
             * We're going to want to have a move-result-pseudo in the
             * next basic block.
             */
        extraBlockCount++;
        moveResult = new PlainInsn(Rops.opMoveResultPseudo(dest.getTypeBearer()), pos, dest, RegisterSpecList.EMPTY);
        dest = null;
    }
    if (ropOpcode == RegOps.NEW_ARRAY) {
        /*
             * In the original bytecode, this was either a primitive
             * array constructor "newarray" or an object array
             * constructor "anewarray". In the former case, there is
             * no explicit constant, and in the latter, the constant
             * is for the element type and not the array type. The rop
             * instruction form for both of these is supposed to be
             * the resulting array type, so we initialize / alter
             * "cst" here, accordingly. Conveniently enough, the rop
             * opcode already gets constructed with the proper array
             * type.
             */
        cst = CstType.intern(rop.getResult());
    } else if ((cst == null) && (sourceCount == 2)) {
        TypeBearer firstType = sources.get(0).getTypeBearer();
        TypeBearer lastType = sources.get(1).getTypeBearer();
        if ((lastType.isConstant() || firstType.isConstant()) && advice.hasConstantOperation(rop, sources.get(0), sources.get(1))) {
            if (lastType.isConstant()) {
                /*
                     * The target architecture has an instruction that can
                     * build in the constant found in the second argument,
                     * so pull it out of the sources and just use it as a
                     * constant here.
                     */
                cst = (Constant) lastType;
                sources = sources.withoutLast();
                // For subtraction, change to addition and invert constant
                if (rop.getOpcode() == RegOps.SUB) {
                    ropOpcode = RegOps.ADD;
                    CstInteger cstInt = (CstInteger) lastType;
                    cst = CstInteger.make(-cstInt.getValue());
                }
            } else {
                /*
                     * The target architecture has an instruction that can
                     * build in the constant found in the first argument,
                     * so pull it out of the sources and just use it as a
                     * constant here.
                     */
                cst = (Constant) firstType;
                sources = sources.withoutFirst();
            }
            rop = Rops.ropFor(ropOpcode, destType, sources, cst);
        }
    }
    SwitchList cases = getAuxCases();
    ArrayList<Constant> initValues = getInitValues();
    boolean canThrow = rop.canThrow();
    blockCanThrow |= canThrow;
    if (cases != null) {
        if (cases.size() == 0) {
            // It's a default-only switch statement. It can happen!
            insn = new PlainInsn(Rops.GOTO, pos, null, RegisterSpecList.EMPTY);
            primarySuccessorIndex = 0;
        } else {
            IntList values = cases.getValues();
            insn = new SwitchInsn(rop, pos, dest, sources, values);
            primarySuccessorIndex = values.size();
        }
    } else if (ropOpcode == RegOps.RETURN) {
        /*
             * Returns get turned into the combination of a move (if
             * non-void and if the return doesn't already mention
             * register 0) and a goto (to the return block).
             */
        if (sources.size() != 0) {
            RegisterSpec source = sources.get(0);
            TypeBearer type = source.getTypeBearer();
            if (source.getReg() != 0) {
                insns.add(new PlainInsn(Rops.opMove(type), pos, RegisterSpec.make(0, type), source));
            }
        }
        insn = new PlainInsn(Rops.GOTO, pos, null, RegisterSpecList.EMPTY);
        primarySuccessorIndex = 0;
        updateReturnOp(rop, pos);
        returns = true;
    } else if (cst != null) {
        if (canThrow) {
            insn = new ThrowingCstInsn(rop, pos, sources, catches, cst);
            catchesUsed = true;
            primarySuccessorIndex = catches.size();
        } else {
            insn = new PlainCstInsn(rop, pos, dest, sources, cst);
        }
    } else if (canThrow) {
        insn = new ThrowingInsn(rop, pos, sources, catches);
        catchesUsed = true;
        if (opcode == ByteOps.ATHROW) {
            /*
                 * The op athrow is the only one where it's possible
                 * to have non-empty successors and yet not have a
                 * primary successor.
                 */
            primarySuccessorIndex = -1;
        } else {
            primarySuccessorIndex = catches.size();
        }
    } else {
        insn = new PlainInsn(rop, pos, dest, sources);
    }
    insns.add(insn);
    if (moveResult != null) {
        insns.add(moveResult);
    }
    /*
         * If initValues is non-null, it means that the parser has
         * seen a group of compatible constant initialization
         * bytecodes that are applied to the current newarray. The
         * action we take here is to convert these initialization
         * bytecodes into a single fill-array-data ROP which lays out
         * all the constant values in a table.
         */
    if (initValues != null) {
        extraBlockCount++;
        insn = new FillArrayDataInsn(Rops.FILL_ARRAY_DATA, pos, RegisterSpecList.make(moveResult.getResult()), initValues, cst);
        insns.add(insn);
    }
}

Example 23 with RegisterSpec

use of com.android.dx.rop.code.RegisterSpec in project buck by facebook.

the class EscapeAnalysis method processInsn.

/**
     * Process a single instruction, looking for new objects resulting from
     * move result or move param.
     *
     * @param insn {@code non-null;} instruction to process
     */
private void processInsn(SsaInsn insn) {
    int op = insn.getOpcode().getOpcode();
    RegisterSpec result = insn.getResult();
    EscapeSet escSet;
    // Identify new objects
    if (op == RegOps.MOVE_RESULT_PSEUDO && result.getTypeBearer().getBasicType() == Type.BT_OBJECT) {
        // Handle objects generated through move_result_pseudo
        escSet = processMoveResultPseudoInsn(insn);
        processRegister(result, escSet);
    } else if (op == RegOps.MOVE_PARAM && result.getTypeBearer().getBasicType() == Type.BT_OBJECT) {
        // Track method arguments that are objects
        escSet = new EscapeSet(result.getReg(), regCount, EscapeState.NONE);
        latticeValues.add(escSet);
        processRegister(result, escSet);
    } else if (op == RegOps.MOVE_RESULT && result.getTypeBearer().getBasicType() == Type.BT_OBJECT) {
        // Track method return values that are objects
        escSet = new EscapeSet(result.getReg(), regCount, EscapeState.NONE);
        latticeValues.add(escSet);
        processRegister(result, escSet);
    }
}

Example 24 with RegisterSpec

use of com.android.dx.rop.code.RegisterSpec in project buck by facebook.

the class EscapeAnalysis method processMoveResultPseudoInsn.

/**
     * Determine the origin of a move result pseudo instruction that generates
     * an object. Creates a new EscapeSet for the new object accordingly.
     *
     * @param insn {@code non-null;} move result pseudo instruction to process
     * @return {@code non-null;} an EscapeSet for the object referred to by the
     * move result pseudo instruction
     */
private EscapeSet processMoveResultPseudoInsn(SsaInsn insn) {
    RegisterSpec result = insn.getResult();
    SsaInsn prevSsaInsn = getInsnForMove(insn);
    int prevOpcode = prevSsaInsn.getOpcode().getOpcode();
    EscapeSet escSet;
    RegisterSpec prevSource;
    switch(prevOpcode) {
        // New instance / Constant
        case RegOps.NEW_INSTANCE:
        case RegOps.CONST:
            escSet = new EscapeSet(result.getReg(), regCount, EscapeState.NONE);
            break;
        // New array
        case RegOps.NEW_ARRAY:
        case RegOps.FILLED_NEW_ARRAY:
            prevSource = prevSsaInsn.getSources().get(0);
            if (prevSource.getTypeBearer().isConstant()) {
                // New fixed array
                escSet = new EscapeSet(result.getReg(), regCount, EscapeState.NONE);
                escSet.replaceableArray = true;
            } else {
                // New variable array
                escSet = new EscapeSet(result.getReg(), regCount, EscapeState.GLOBAL);
            }
            break;
        // Loading a static object
        case RegOps.GET_STATIC:
            escSet = new EscapeSet(result.getReg(), regCount, EscapeState.GLOBAL);
            break;
        // Type cast / load an object from a field or array
        case RegOps.CHECK_CAST:
        case RegOps.GET_FIELD:
        case RegOps.AGET:
            prevSource = prevSsaInsn.getSources().get(0);
            int setIndex = findSetIndex(prevSource);
            // Set should already exist, try to find it
            if (setIndex != latticeValues.size()) {
                escSet = latticeValues.get(setIndex);
                escSet.regSet.set(result.getReg());
                return escSet;
            }
            // Set not found, must be either null or unknown
            if (prevSource.getType() == Type.KNOWN_NULL) {
                escSet = new EscapeSet(result.getReg(), regCount, EscapeState.NONE);
            } else {
                escSet = new EscapeSet(result.getReg(), regCount, EscapeState.GLOBAL);
            }
            break;
        default:
            return null;
    }
    // Add the newly created escSet to the lattice and return it
    latticeValues.add(escSet);
    return escSet;
}

Example 25 with RegisterSpec

use of com.android.dx.rop.code.RegisterSpec in project buck by facebook.

the class EscapeAnalysis method processUse.

/**
     * Handles non-phi uses of new objects. Checks to see how instruction is
     * used and updates the escape state accordingly.
     *
     * @param def {@code non-null;} register holding definition of new object
     * @param use {@code non-null;} use of object being processed
     * @param escSet {@code non-null;} EscapeSet for the object
     * @param regWorklist {@code non-null;} worklist of instructions left to
     * process for this object
     */
private void processUse(RegisterSpec def, SsaInsn use, EscapeSet escSet, ArrayList<RegisterSpec> regWorklist) {
    int useOpcode = use.getOpcode().getOpcode();
    switch(useOpcode) {
        case RegOps.MOVE:
            // Follow uses of the move by adding it to the worklist
            escSet.regSet.set(use.getResult().getReg());
            regWorklist.add(use.getResult());
            break;
        case RegOps.IF_EQ:
        case RegOps.IF_NE:
        case RegOps.CHECK_CAST:
            // Compared objects can't be replaced, so promote if necessary
            if (escSet.escape.compareTo(EscapeState.METHOD) < 0) {
                escSet.escape = EscapeState.METHOD;
            }
            break;
        case RegOps.APUT:
            // For array puts, check for a constant array index
            RegisterSpec putIndex = use.getSources().get(2);
            if (!putIndex.getTypeBearer().isConstant()) {
                // If not constant, array can't be replaced
                escSet.replaceableArray = false;
            }
        // Intentional fallthrough
        case RegOps.PUT_FIELD:
            // Skip non-object puts
            RegisterSpec putValue = use.getSources().get(0);
            if (putValue.getTypeBearer().getBasicType() != Type.BT_OBJECT) {
                break;
            }
            escSet.replaceableArray = false;
            // Raise 1st object's escape state to 2nd if 2nd is higher
            RegisterSpecList sources = use.getSources();
            if (sources.get(0).getReg() == def.getReg()) {
                int setIndex = findSetIndex(sources.get(1));
                if (setIndex != latticeValues.size()) {
                    EscapeSet parentSet = latticeValues.get(setIndex);
                    addEdge(parentSet, escSet);
                    if (escSet.escape.compareTo(parentSet.escape) < 0) {
                        escSet.escape = parentSet.escape;
                    }
                }
            } else {
                int setIndex = findSetIndex(sources.get(0));
                if (setIndex != latticeValues.size()) {
                    EscapeSet childSet = latticeValues.get(setIndex);
                    addEdge(escSet, childSet);
                    if (childSet.escape.compareTo(escSet.escape) < 0) {
                        childSet.escape = escSet.escape;
                    }
                }
            }
            break;
        case RegOps.AGET:
            // For array gets, check for a constant array index
            RegisterSpec getIndex = use.getSources().get(1);
            if (!getIndex.getTypeBearer().isConstant()) {
                // If not constant, array can't be replaced
                escSet.replaceableArray = false;
            }
            break;
        case RegOps.PUT_STATIC:
            // Static puts cause an object to escape globally
            escSet.escape = EscapeState.GLOBAL;
            break;
        case RegOps.INVOKE_STATIC:
        case RegOps.INVOKE_VIRTUAL:
        case RegOps.INVOKE_SUPER:
        case RegOps.INVOKE_DIRECT:
        case RegOps.INVOKE_INTERFACE:
        case RegOps.RETURN:
        case RegOps.THROW:
            // These operations cause an object to escape interprocedurally
            escSet.escape = EscapeState.INTER;
            break;
        default:
            break;
    }
}