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

Example 1 with PlainInsn

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

the class EscapeAnalysis method insertPlainInsnBefore.

/**
     * Inserts a new PlainInsn before the given instruction.
     * TODO: move this somewhere more appropriate
     *
     * @param insn {@code non-null;} instruction to insert before
     * @param newSources {@code non-null;} sources of new instruction
     * @param newResult {@code non-null;} result of new instruction
     * @param newOpcode opcode of new instruction
     * @param cst {@code null-ok;} constant for new instruction, if any
     */
private void insertPlainInsnBefore(SsaInsn insn, RegisterSpecList newSources, RegisterSpec newResult, int newOpcode, Constant cst) {
    Insn originalRopInsn = insn.getOriginalRopInsn();
    Rop newRop;
    if (newOpcode == RegOps.MOVE_RESULT_PSEUDO) {
        newRop = Rops.opMoveResultPseudo(newResult.getType());
    } else {
        newRop = Rops.ropFor(newOpcode, newResult, newSources, cst);
    }
    Insn newRopInsn;
    if (cst == null) {
        newRopInsn = new PlainInsn(newRop, originalRopInsn.getPosition(), newResult, newSources);
    } else {
        newRopInsn = new PlainCstInsn(newRop, originalRopInsn.getPosition(), newResult, newSources, cst);
    }
    NormalSsaInsn newInsn = new NormalSsaInsn(newRopInsn, insn.getBlock());
    List<SsaInsn> insns = insn.getBlock().getInsns();
    insns.add(insns.lastIndexOf(insn), newInsn);
    ssaMeth.onInsnAdded(newInsn);
}

Example 2 with PlainInsn

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

the class LiteralOpUpgrader method replacePlainInsn.

/**
     * Replaces an SsaInsn containing a PlainInsn with a new PlainInsn. The
     * new PlainInsn is constructed with a new RegOp and new sources.
     *
     * TODO move this somewhere else.
     *
     * @param insn {@code non-null;} an SsaInsn containing a PlainInsn
     * @param newSources {@code non-null;} new sources list for new insn
     * @param newOpcode A RegOp from {@link RegOps}
     * @param cst {@code null-ok;} constant for new instruction, if any
     */
private void replacePlainInsn(NormalSsaInsn insn, RegisterSpecList newSources, int newOpcode, Constant cst) {
    Insn originalRopInsn = insn.getOriginalRopInsn();
    Rop newRop = Rops.ropFor(newOpcode, insn.getResult(), newSources, cst);
    Insn newRopInsn;
    if (cst == null) {
        newRopInsn = new PlainInsn(newRop, originalRopInsn.getPosition(), insn.getResult(), newSources);
    } else {
        newRopInsn = new PlainCstInsn(newRop, originalRopInsn.getPosition(), insn.getResult(), newSources, cst);
    }
    NormalSsaInsn newInsn = new NormalSsaInsn(newRopInsn, insn.getBlock());
    List<SsaInsn> insns = insn.getBlock().getInsns();
    ssaMeth.onInsnRemoved(insn);
    insns.set(insns.lastIndexOf(insn), newInsn);
    ssaMeth.onInsnAdded(newInsn);
}

Example 3 with PlainInsn

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

the class SsaBasicBlock method scheduleMovesFromPhis.

/**
     * Sorts move instructions added via {@code addMoveToEnd} during
     * phi removal so that results don't overwrite sources that are used.
     * For use after all phis have been removed and all calls to
     * addMoveToEnd() have been made.<p>
     *
     * This is necessary because copy-propogation may have left us in a state
     * where the same basic block has the same register as a phi operand
     * and a result. In this case, the register in the phi operand always
     * refers value before any other phis have executed.
     */
public void scheduleMovesFromPhis() {
    if (movesFromPhisAtBeginning > 1) {
        List<SsaInsn> toSchedule;
        toSchedule = insns.subList(0, movesFromPhisAtBeginning);
        scheduleUseBeforeAssigned(toSchedule);
        SsaInsn firstNonPhiMoveInsn = insns.get(movesFromPhisAtBeginning);
        /*
             * TODO: It's actually possible that this case never happens,
             * because a move-exception block, having only one predecessor
             * in SSA form, perhaps is never on a dominance frontier.
             */
        if (firstNonPhiMoveInsn.isMoveException()) {
            if (true) {
                /*
                     * We've yet to observe this case, and if it can
                     * occur the code written to handle it probably
                     * does not work.
                     */
                throw new RuntimeException("Unexpected: moves from " + "phis before move-exception");
            } else {
                /*
                     * A move-exception insn must be placed first in this block
                     * We need to move it there, and deal with possible
                     * interference.
                     */
                boolean moveExceptionInterferes = false;
                int moveExceptionResult = firstNonPhiMoveInsn.getResult().getReg();
                /*
                     * Does the move-exception result reg interfere with the
                     * phi moves?
                     */
                for (SsaInsn insn : toSchedule) {
                    if (insn.isResultReg(moveExceptionResult) || insn.isRegASource(moveExceptionResult)) {
                        moveExceptionInterferes = true;
                        break;
                    }
                }
                if (!moveExceptionInterferes) {
                    // This is the easy case.
                    insns.remove(movesFromPhisAtBeginning);
                    insns.add(0, firstNonPhiMoveInsn);
                } else {
                    /*
                         * We need to move the result to a spare reg
                         * and move it back.
                         */
                    RegisterSpec originalResultSpec = firstNonPhiMoveInsn.getResult();
                    int spareRegister = parent.borrowSpareRegister(originalResultSpec.getCategory());
                    // We now move it to a spare register.
                    firstNonPhiMoveInsn.changeResultReg(spareRegister);
                    RegisterSpec tempSpec = firstNonPhiMoveInsn.getResult();
                    insns.add(0, firstNonPhiMoveInsn);
                    // And here we move it back.
                    NormalSsaInsn toAdd = new NormalSsaInsn(new PlainInsn(Rops.opMove(tempSpec.getType()), SourcePosition.NO_INFO, originalResultSpec, RegisterSpecList.make(tempSpec)), this);
                    /*
                         * Place it immediately after the phi-moves,
                         * overwriting the move-exception that was there.
                         */
                    insns.set(movesFromPhisAtBeginning + 1, toAdd);
                }
            }
        }
    }
    if (movesFromPhisAtEnd > 1) {
        scheduleUseBeforeAssigned(insns.subList(insns.size() - movesFromPhisAtEnd - 1, insns.size() - 1));
    }
    // Return registers borrowed here and in scheduleUseBeforeAssigned().
    parent.returnSpareRegisters();
}

Example 4 with PlainInsn

use of com.android.dx.rop.code.PlainInsn 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 5 with PlainInsn

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

the class Ropper method addReturnBlock.

/**
     * Constructs and adds the return block, if necessary. The return
     * block merely contains an appropriate {@code return}
     * instruction.
     */
private void addReturnBlock() {
    Rop returnOp = machine.getReturnOp();
    if (returnOp == null) {
        /*
             * The method being converted never returns normally, so there's
             * no need for a return block.
             */
        return;
    }
    SourcePosition returnPos = machine.getReturnPosition();
    int label = getSpecialLabel(RETURN);
    if (isSynchronized()) {
        InsnList insns = new InsnList(1);
        Insn insn = new ThrowingInsn(Rops.MONITOR_EXIT, returnPos, RegisterSpecList.make(getSynchReg()), StdTypeList.EMPTY);
        insns.set(0, insn);
        insns.setImmutable();
        int nextLabel = getSpecialLabel(SYNCH_RETURN);
        BasicBlock bb = new BasicBlock(label, insns, IntList.makeImmutable(nextLabel), nextLabel);
        addBlock(bb, IntList.EMPTY);
        label = nextLabel;
    }
    InsnList insns = new InsnList(1);
    TypeList sourceTypes = returnOp.getSources();
    RegisterSpecList sources;
    if (sourceTypes.size() == 0) {
        sources = RegisterSpecList.EMPTY;
    } else {
        RegisterSpec source = RegisterSpec.make(0, sourceTypes.getType(0));
        sources = RegisterSpecList.make(source);
    }
    Insn insn = new PlainInsn(returnOp, returnPos, null, sources);
    insns.set(0, insn);
    insns.setImmutable();
    BasicBlock bb = new BasicBlock(label, insns, IntList.EMPTY, -1);
    addBlock(bb, IntList.EMPTY);
}