Examples with Local com.googlecode.dex2jar.ir.expr.Local used on opensource projects

Example 1 with Local

use of com.googlecode.dex2jar.ir.expr.Local in project dex2jar by pxb1988.

the class DeadCodeTransformer method transform.

@Override
public void transform(IrMethod method) {
    Cfg.createCFG(method);
    Cfg.dfsVisit(method, null);
    if (method.traps != null) {
        for (Iterator<Trap> it = method.traps.iterator(); it.hasNext(); ) {
            Trap t = it.next();
            boolean allNotThrow = true;
            for (Stmt p = t.start; p != t.end; p = p.getNext()) {
                if (p.visited && Cfg.isThrow(p)) {
                    allNotThrow = false;
                    break;
                }
            }
            if (allNotThrow) {
                it.remove();
                continue;
            }
            boolean allNotVisited = true;
            boolean allVisited = true;
            for (LabelStmt labelStmt : t.handlers) {
                if (labelStmt.visited) {
                    allNotVisited = false;
                } else {
                    allVisited = false;
                }
            }
            if (allNotVisited) {
                it.remove();
            } else {
                // keep start and end
                t.start.visited = true;
                t.end.visited = true;
                if (!allVisited) {
                    // part visited
                    List<String> types = new ArrayList<>(t.handlers.length);
                    List<LabelStmt> labelStmts = new ArrayList<>(t.handlers.length);
                    for (int i = 0; i < t.handlers.length; i++) {
                        labelStmts.add(t.handlers[i]);
                        types.add(t.types[i]);
                    }
                    t.handlers = labelStmts.toArray(new LabelStmt[labelStmts.size()]);
                    t.types = types.toArray(new String[types.size()]);
                }
            }
        }
    }
    Set<Local> definedLocals = new HashSet<>();
    for (Iterator<Stmt> it = method.stmts.iterator(); it.hasNext(); ) {
        Stmt p = it.next();
        if (!p.visited) {
            it.remove();
            continue;
        }
        if (p.st == Stmt.ST.ASSIGN || p.st == Stmt.ST.IDENTITY) {
            if (p.getOp1().vt == Value.VT.LOCAL) {
                definedLocals.add((Local) p.getOp1());
            }
        }
    }
    if (method.phiLabels != null) {
        for (Iterator<LabelStmt> it = method.phiLabels.iterator(); it.hasNext(); ) {
            LabelStmt labelStmt = it.next();
            if (!labelStmt.visited) {
                it.remove();
                continue;
            }
            if (labelStmt.phis != null) {
                for (AssignStmt phi : labelStmt.phis) {
                    definedLocals.add((Local) phi.getOp1());
                }
            }
        }
    }
    method.locals.clear();
    method.locals.addAll(definedLocals);
    Set<Value> tmp = new HashSet<>();
    if (method.phiLabels != null) {
        for (Iterator<LabelStmt> it = method.phiLabels.iterator(); it.hasNext(); ) {
            LabelStmt labelStmt = it.next();
            if (labelStmt.phis != null) {
                for (AssignStmt phi : labelStmt.phis) {
                    PhiExpr phiExpr = (PhiExpr) phi.getOp2();
                    boolean needRebuild = false;
                    for (Value v : phiExpr.getOps()) {
                        if (!definedLocals.contains(v)) {
                            needRebuild = true;
                            break;
                        }
                    }
                    if (needRebuild) {
                        for (Value v : phiExpr.getOps()) {
                            if (definedLocals.contains(v)) {
                                tmp.add(v);
                            }
                        }
                        phiExpr.setOps(tmp.toArray(new Value[tmp.size()]));
                        tmp.clear();
                    }
                }
            }
        }
    }
}

Example 2 with Local

use of com.googlecode.dex2jar.ir.expr.Local in project dex2jar by pxb1988.

the class FixVar method transform.

@Override
public void transform(IrMethod irMethod) {
    int i = 0;
    for (LocalVar var : irMethod.vars) {
        if (var.reg.trim().vt != VT.LOCAL) {
            if (var.reg.trim().vt == VT.CONSTANT) {
                Local n = new Local(i++);
                Value old = var.reg.trim();
                irMethod.stmts.insertBefore(var.start, Stmts.nAssign(n, old));
                var.reg = n;
                irMethod.locals.add(n);
            } else {
            // throw new DexExcpeption("not support");
            }
        }
    }
}

Example 3 with Local

use of com.googlecode.dex2jar.ir.expr.Local in project dex2jar by pxb1988.

the class Ir2JRegAssignTransformer method genGraph.

private Reg[] genGraph(IrMethod method, final Reg[] regs) {
    Reg[] args;
    if (method.isStatic) {
        args = new Reg[method.args.length];
    } else {
        args = new Reg[method.args.length + 1];
    }
    Set<Stmt> tos = new HashSet<>();
    for (Stmt stmt : method.stmts) {
        if (stmt.st == ST.ASSIGN || stmt.st == ST.IDENTITY) {
            if (stmt.getOp1().vt == VT.LOCAL) {
                Local left = (Local) stmt.getOp1();
                Value op2 = stmt.getOp2();
                int idx = left._ls_index;
                Reg leftReg = regs[idx];
                // a new local can't effect next value live in next frame
                Cfg.collectTos(stmt, tos);
                for (Stmt next : tos) {
                    SimpleLiveValue[] frame = (SimpleLiveValue[]) next.frame;
                    if (frame == null) {
                        continue;
                    }
                    for (int i = 0; i < frame.length; i++) {
                        if (i == idx) {
                            continue;
                        }
                        SimpleLiveValue v = frame[i];
                        if (v != null && v.used) {
                            Reg rightReg = regs[i];
                            leftReg.excludes.add(rightReg);
                            rightReg.excludes.add(leftReg);
                        }
                    }
                }
                tos.clear();
                // Preferred same reg can save load-store
                if (op2.vt == VT.LOCAL) {
                    Reg rightReg = regs[((Local) op2)._ls_index];
                    leftReg.prefers.add(rightReg);
                    rightReg.prefers.add(leftReg);
                }
                // record @this @parameter_x
                if (op2.vt == VT.THIS_REF) {
                    args[0] = leftReg;
                } else if (op2.vt == VT.PARAMETER_REF) {
                    RefExpr refExpr = (RefExpr) op2;
                    if (method.isStatic) {
                        args[refExpr.parameterIndex] = leftReg;
                    } else {
                        args[refExpr.parameterIndex + 1] = leftReg;
                    }
                }
            }
        }
    }
    // remove the link between itself
    for (Reg reg : regs) {
        reg.excludes.remove(reg);
        reg.prefers.remove(reg);
    }
    return args;
}

Example 4 with Local

use of com.googlecode.dex2jar.ir.expr.Local in project dex2jar by pxb1988.

the class Ir2JRegAssignTransformer method transform.

@Override
public void transform(IrMethod method) {
    if (method.locals.size() == 0) {
        return;
    }
    SimpleLiveAnalyze sa = new SimpleLiveAnalyze(method, true);
    sa.analyze();
    // init regs
    int maxLocalSize = sa.getLocalSize();
    final Reg[] regs = new Reg[maxLocalSize];
    for (Local local : method.locals) {
        Reg reg = new Reg();
        char type = local.valueType.charAt(0);
        if (type == '[') {
            type = 'L';
        }
        reg.type = type;
        local.tag = reg;
        regs[local._ls_index] = reg;
    }
    // gen graph
    Reg[] args = genGraph(method, regs);
    // fix up the graph, make sure @this is not share index with others
    if (!method.isStatic) {
        Reg atThis = args[0];
        for (Reg reg : regs) {
            if (reg == atThis) {
                continue;
            }
            reg.excludes.add(atThis);
            atThis.excludes.add(reg);
        }
    }
    {
        // assgin @this, @parameter_x from index 0
        int i = 0;
        int index = 0;
        if (!method.isStatic) {
            args[i++].reg = index++;
        }
        for (int j = 0; j < method.args.length; j++) {
            Reg reg = args[i++];
            String type = method.args[j];
            if (reg == null) {
                index++;
            } else {
                reg.reg = index++;
            }
            if ("J".equals(type) || "D".equals(type)) {
                index++;
            }
        }
    }
    Map<Character, List<Reg>> groups = groupAndCleanUpByType(regs);
    // type each group
    BitSet excludeColor = new BitSet();
    BitSet suggestColor = new BitSet();
    BitSet globalExcludes = new BitSet();
    BitSet usedInOneType = new BitSet();
    for (Map.Entry<Character, List<Reg>> e : groups.entrySet()) {
        List<Reg> assigns = e.getValue();
        Collections.sort(assigns, OrderRegAssignByPreferredSizeDesc);
        char type = e.getKey();
        boolean doubleOrLong = type == 'J' || type == 'D';
        for (Reg as : assigns) {
            if (as.reg < 0) {
                // need color
                initExcludeColor(excludeColor, as);
                excludeParameters(excludeColor, args, type);
                // exclude index used by other types
                excludeColor.or(globalExcludes);
                initSuggestColor(suggestColor, as);
                // first find a preferred color
                for (int i = suggestColor.nextSetBit(0); i >= 0; i = suggestColor.nextSetBit(i + 1)) {
                    if (doubleOrLong) {
                        // need 2
                        if (!excludeColor.get(i) && !excludeColor.get(i + 1)) {
                            as.reg = i;
                            break;
                        }
                    } else {
                        if (!excludeColor.get(i)) {
                            as.reg = i;
                            break;
                        }
                    }
                }
                if (as.reg < 0) {
                    if (doubleOrLong) {
                        int reg = -1;
                        do {
                            reg++;
                            reg = excludeColor.nextClearBit(reg);
                        } while (excludeColor.get(reg + 1));
                        as.reg = reg;
                    } else {
                        int reg = excludeColor.nextClearBit(0);
                        as.reg = reg;
                    }
                }
            }
            usedInOneType.set(as.reg);
            if (doubleOrLong) {
                usedInOneType.set(as.reg + 1);
            }
        }
        globalExcludes.or(usedInOneType);
        usedInOneType.clear();
    }
    for (Local local : method.locals) {
        Reg as = (Reg) local.tag;
        local._ls_index = as.reg;
        local.tag = null;
    }
    for (Stmt stmt : method.stmts) {
        stmt.frame = null;
    }
}

Example 5 with Local

use of com.googlecode.dex2jar.ir.expr.Local in project dex2jar by pxb1988.

the class AggTransformer method simpleMergeLocals.

/**
     * if a local is only used in one place, and the value is isLocationInsensitive,
     * remove the local and replace it with its value
     * <pre>
     *     a=b+c
     *     d=a+e
     * </pre>
     * to
     * <pre>
     *     d=(b+c)+e
     * </pre>
     */
private boolean simpleMergeLocals(IrMethod method, boolean changed, Set<Stmt> locationSensitiveStmts) {
    if (method.locals.size() == 0) {
        return false;
    }
    final int[] readCounts = Cfg.countLocalReads(method);
    Set<Local> useInPhi = collectLocalUsedInPhi(method);
    final Map<Local, Value> toReplace = new HashMap<>();
    for (Iterator<Stmt> it = method.stmts.iterator(); it.hasNext(); ) {
        Stmt p = it.next();
        if (p.st == Stmt.ST.ASSIGN && p.getOp1().vt == Value.VT.LOCAL) {
            Local local = (Local) p.getOp1();
            if (useInPhi.contains(local)) {
                continue;
            }
            if (readCounts[local._ls_index] < 2) {
                Value op2 = p.getOp2();
                if (isLocationInsensitive(op2)) {
                    method.locals.remove(local);
                    toReplace.put(local, op2);
                    it.remove();
                    changed = true;
                } else {
                    locationSensitiveStmts.add(p);
                }
            }
        }
    }
    Cfg.TravelCallBack tcb = new Cfg.TravelCallBack() {

        @Override
        public Value onAssign(Local v, AssignStmt as) {
            return v;
        }

        @Override
        public Value onUse(Local v) {
            Value v2 = toReplace.get(v);
            if (v2 != null) {
                return v2;
            }
            return v;
        }
    };
    modReplace(toReplace, tcb);
    Cfg.travelMod(method.stmts, tcb, false);
    return changed;
}