Examples with LabelStmt com.googlecode.dex2jar.ir.stmt.LabelStmt used on opensource projects

Example 1 with LabelStmt

use of com.googlecode.dex2jar.ir.stmt.LabelStmt 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 LabelStmt

use of com.googlecode.dex2jar.ir.stmt.LabelStmt in project dex2jar by pxb1988.

the class IrMethod method clone.

public IrMethod clone() {
    IrMethod n = new IrMethod();
    LabelAndLocalMapper mapper = new LabelAndLocalMapper();
    n.name = name;
    n.args = args;
    n.isStatic = isStatic;
    n.owner = owner;
    n.ret = ret;
    n.stmts = stmts.clone(mapper);
    for (Trap trap : traps) {
        n.traps.add(trap.clone(mapper));
    }
    for (LocalVar var : vars) {
        n.vars.add(var.clone(mapper));
    }
    if (phiLabels != null) {
        List<LabelStmt> nPhiLabels = new ArrayList<>(phiLabels.size());
        for (LabelStmt labelStmt : phiLabels) {
            nPhiLabels.add(labelStmt.clone(mapper));
        }
        n.phiLabels = nPhiLabels;
    }
    for (Local local : locals) {
        n.locals.add((Local) local.clone(mapper));
    }
    return n;
}

Example 3 with LabelStmt

use of com.googlecode.dex2jar.ir.stmt.LabelStmt in project dex2jar by pxb1988.

the class LabelAndLocalMapper method map.

public LabelStmt map(LabelStmt label) {
    LabelStmt nTarget = labels.get(label);
    if (nTarget == null) {
        nTarget = Stmts.nLabel();
        labels.put(label, nTarget);
    }
    return nTarget;
}

Example 4 with LabelStmt

use of com.googlecode.dex2jar.ir.stmt.LabelStmt in project dex2jar by pxb1988.

the class RemoveLocalFromSSA method replacePhi.

private void replacePhi(List<LabelStmt> phiLabels, Map<Local, Local> toReplace, Set<Value> set) {
    if (phiLabels != null) {
        for (LabelStmt labelStmt : phiLabels) {
            for (AssignStmt phi : labelStmt.phis) {
                Value[] ops = phi.getOp2().getOps();
                for (Value op : ops) {
                    Value n = toReplace.get(op);
                    if (n != null) {
                        set.add(n);
                    } else {
                        set.add(op);
                    }
                }
                set.remove(phi.getOp1());
                phi.getOp2().setOps(set.toArray(new Value[set.size()]));
                set.clear();
            }
        }
    }
}

Example 5 with LabelStmt

use of com.googlecode.dex2jar.ir.stmt.LabelStmt in project dex2jar by pxb1988.

the class RemoveLocalFromSSA method removeLoopFromPhi.

private boolean removeLoopFromPhi(List<LabelStmt> phiLabels, Map<Local, Local> toReplace) {
    boolean changed = false;
    if (phiLabels != null) {
        Set<Local> toDeletePhiAssign = new HashSet<>();
        Map<Local, PhiObject> phis;
        // detect loop init in phi
        phis = collectPhiObjects(phiLabels);
        Queue<PhiObject> q = new UniqueQueue<>();
        q.addAll(phis.values());
        while (!q.isEmpty()) {
            PhiObject po = q.poll();
            for (PhiObject child : po.children) {
                if (child.isInitByPhi) {
                    if (child.parent.addAll(po.parent)) {
                        q.add(child);
                    }
                }
            }
        }
        for (PhiObject po : phis.values()) {
            if (po.isInitByPhi) {
                Local local = null;
                for (PhiObject p : po.parent) {
                    if (!p.isInitByPhi) {
                        if (local == null) {
                            // the first non-phi value
                            local = p.local;
                        } else {
                            local = null;
                            break;
                        }
                    }
                }
                if (local != null) {
                    toReplace.put(po.local, local);
                    toDeletePhiAssign.add(po.local);
                    changed = true;
                }
            }
        }
        for (Iterator<LabelStmt> itLabel = phiLabels.iterator(); itLabel.hasNext(); ) {
            LabelStmt labelStmt = itLabel.next();
            for (Iterator<AssignStmt> it = labelStmt.phis.iterator(); it.hasNext(); ) {
                AssignStmt phi = it.next();
                if (toDeletePhiAssign.contains(phi.getOp1())) {
                    it.remove();
                }
            }
            if (labelStmt.phis.size() == 0) {
                labelStmt.phis = null;
                itLabel.remove();
            }
        }
    }
    return changed;
}