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

Example 26 with LabelStmt

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

the class FillArrayTransformer method searchForArrayObject.

private Map<Local, ArrayObject> searchForArrayObject(IrMethod method) {
    final Map<Local, ArrayObject> arraySizes = new HashMap<>();
    if (method.locals.size() == 0) {
        return arraySizes;
    }
    Cfg.createCFG(method);
    Cfg.dfsVisit(method, new Cfg.DfsVisitor() {

        @Override
        public void onVisit(Stmt p) {
            if (p.st == Stmt.ST.ASSIGN) {
                if (p.getOp2().vt == Value.VT.NEW_ARRAY && p.getOp1().vt == Value.VT.LOCAL) {
                    TypeExpr ae = (TypeExpr) p.getOp2();
                    if (ae.getOp().vt == Value.VT.CONSTANT) {
                        int size = ((Number) ((Constant) ae.getOp()).value).intValue();
                        // }
                        if (size >= 0) {
                            arraySizes.put((Local) p.getOp1(), new ArrayObject(size, ae.type, (AssignStmt) p));
                        }
                    }
                } else if (p.getOp1().vt == Value.VT.ARRAY) {
                    ArrayExpr ae = (ArrayExpr) p.getOp1();
                    if (ae.getOp1().vt == Value.VT.LOCAL) {
                        Local local = (Local) ae.getOp1();
                        ArrayObject arrayObject = arraySizes.get(local);
                        if (arrayObject != null) {
                            if (ae.getOp2().vt == Value.VT.CONSTANT) {
                                arrayObject.putItem.add(p);
                            } else {
                                arraySizes.remove(local);
                            }
                        }
                    }
                }
            } else if (p.st == Stmt.ST.FILL_ARRAY_DATA) {
                if (p.getOp1().vt == Value.VT.LOCAL) {
                    Local local = (Local) p.getOp1();
                    ArrayObject arrayObject = arraySizes.get(local);
                    if (arrayObject != null) {
                        arrayObject.putItem.add(p);
                    }
                }
            }
        }
    });
    if (arraySizes.size() > 0) {
        Set<Local> set = new HashSet<Local>();
        if (method.phiLabels != null) {
            for (LabelStmt labelStmt : method.phiLabels) {
                if (labelStmt.phis != null) {
                    for (AssignStmt as : labelStmt.phis) {
                        set.add((Local) as.getOp1());
                        for (Value v : as.getOp2().getOps()) {
                            set.add((Local) v);
                        }
                    }
                }
            }
        }
        if (set.size() > 0) {
            for (Local local : set) {
                arraySizes.remove(local);
            }
        }
    }
    return arraySizes;
}

Example 27 with LabelStmt

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

the class UnSSATransformer method transform.

@Override
public void transform(IrMethod method) {
    if (method.phiLabels == null || method.phiLabels.size() == 0) {
        return;
    }
    // 1. Live analyze the method,
    // a. remove Phi,
    // b. record parameter reference
    LiveA liveA = new LiveA(method);
    liveA.analyze();
    genRegGraph(method, liveA);
    // 2. insert x=y
    fixPhi(method, method.phiLabels);
    insertAssignPath(method, method.phiLabels);
    // 4. clean up
    for (Local local : method.locals) {
        local.tag = null;
    }
    for (Stmt stmt : method.stmts) {
        stmt.frame = null;
    }
    for (LabelStmt labelStmt : method.phiLabels) {
        labelStmt.phis = null;
    }
    method.phiLabels = null;
}

Example 28 with LabelStmt

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

the class UnSSATransformer method fixPhi.

/**
     * there is somewhere both a and its possible x is both live, insert a=x, will change the meaning for example
     * 
     * <pre>
     *                      L0:
     *                      a = phi(b, ... )
     *                      b = 234;
     *                      if a>0 goto L0: // a, b both live here
     *                      ...
     * </pre>
     * 
     * after insert a=b before the if stmt, the programe change to
     * 
     * <pre>
     *                      L0:
     *                      // a = phi(b, ... )
     *                      b = 234;
     *                      a = b
     *                      if a>0 goto L0:
     *                      ...
     * </pre>
     * 
     * the solution is by introduce a new local x
     * 
     * <pre>
     *                      L0:
     *                      x = phi(b, ... )
     *                      a = x
     *                      b = 234;
     *                      if a>0 goto L0: // a, b both live here
     *                      ...
     * </pre>
     * 
     * insert x = b is ok now
     * 
     * <pre>
     *                      L0:
     *                      // x = phi(b, ... )
     *                      a = x
     *                      b = 234;
     *                      x = b
     *                      if a>0 goto L0: // a, b both live here
     *                      ...
     * </pre>
     * 
     * @param phiLabels
     */
private void fixPhi(IrMethod method, Collection<LabelStmt> phiLabels) {
    for (LabelStmt labelStmt : phiLabels) {
        List<AssignStmt> phis = (List<AssignStmt>) labelStmt.phis;
        for (AssignStmt phi : phis) {
            Local a = (Local) phi.getOp1();
            PhiExpr b = (PhiExpr) phi.getOp2();
            boolean introduceNewLocal = false;
            RegAssign aReg = (RegAssign) a.tag;
            for (Value op : b.getOps()) {
                RegAssign bReg = (RegAssign) ((Local) op).tag;
                if (aReg.excludes.contains(bReg)) {
                    introduceNewLocal = true;
                    break;
                }
            }
            if (introduceNewLocal) {
                Local newLocal = (Local) a.clone();
                if (DEBUG) {
                    newLocal.debugName = "x" + method.locals.size();
                }
                phi.op1 = newLocal;
                RegAssign newRegAssign = new RegAssign();
                newLocal.tag = newRegAssign;
                method.locals.add(newLocal);
                Stmt newAssigStmt = Stmts.nAssign(a, newLocal);
                Stmt next = labelStmt.getNext();
                if (next != null && next.st == ST.IDENTITY && next.getOp2().vt == VT.EXCEPTION_REF) {
                    // it's a handler, insert after the exception ref
                    method.stmts.insertAfter(next, newAssigStmt);
                } else {
                    method.stmts.insertAfter(labelStmt, newAssigStmt);
                }
                LiveV[] frame = (LiveV[]) labelStmt.frame;
                if (DEBUG) {
                    LiveV[] copy = frame.clone();
                    LiveV n = new LiveV();
                    n.local = a;
                    n.used = true;
                    copy[a._ls_index] = new LiveV();
                    newAssigStmt.frame = copy;
                }
                LiveV thePhi = frame[a._ls_index];
                thePhi.local = newLocal;
                for (LiveV v : frame) {
                    if (v != null && v.used) {
                        RegAssign s = (RegAssign) v.local.tag;
                        s.excludes.add(newRegAssign);
                        newRegAssign.excludes.add(s);
                    }
                }
            }
        }
    }
}

Example 29 with LabelStmt

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

the class UnSSATransformer method genRegGraph.

private void genRegGraph(IrMethod method, LiveA liveA) {
    for (Local local : method.locals) {
        local.tag = new RegAssign();
    }
    Set<Stmt> tos = new HashSet<>();
    for (Stmt stmt : method.stmts) {
        if ((stmt.st == ST.ASSIGN || stmt.st == ST.IDENTITY) && stmt.getOp1().vt == VT.LOCAL) {
            Local localAssignTo = (Local) stmt.getOp1();
            RegAssign regAssignTo = (RegAssign) localAssignTo.tag;
            Set<Integer> excludeIdx = new HashSet<>();
            Cfg.collectTos(stmt, tos);
            for (Stmt target : tos) {
                LiveV[] frame = (LiveV[]) target.frame;
                if (frame == null) {
                    continue;
                }
                // exclude thisReg and phiReg
                excludeIdx.clear();
                excludeIdx.add(localAssignTo._ls_index);
                if (target.st == ST.LABEL) {
                    LabelStmt label = (LabelStmt) target;
                    if (label.phis != null) {
                        for (AssignStmt phiAssignStmt : (List<AssignStmt>) label.phis) {
                            Local phiLocal = (Local) phiAssignStmt.getOp1();
                            excludeIdx.add(phiLocal._ls_index);
                        }
                    }
                }
                for (int i = 0; i < frame.length; i++) {
                    if (excludeIdx.contains(i)) {
                        continue;
                    }
                    LiveV v = frame[i];
                    if (v != null && v.used) {
                        RegAssign b = (RegAssign) v.local.tag;
                        regAssignTo.excludes.add(b);
                        b.excludes.add(regAssignTo);
                    }
                }
            }
            tos.clear();
        } else if (stmt.st == ST.LABEL) {
            //
            LabelStmt label = (LabelStmt) stmt;
            if (label.phis != null) {
                for (AssignStmt phiAssignStmt : (List<AssignStmt>) label.phis) {
                    Local phiLocal = (Local) phiAssignStmt.getOp1();
                    RegAssign a = (RegAssign) phiLocal.tag;
                    LiveV[] frame = (LiveV[]) stmt.frame;
                    for (LiveV v : frame) {
                        if (v != null && v.used) {
                            RegAssign b = (RegAssign) v.local.tag;
                            a.excludes.add(b);
                            b.excludes.add(a);
                        }
                    }
                }
            }
        }
    }
    if (DEBUG) {
        System.out.println(liveA.toString());
    }
}

Example 30 with LabelStmt

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

the class BaseAnalyze method init.

protected void init() {
    if (reindexLocal) {
        int index = 0;
        for (Local local : method.locals) {
            local._ls_index = index;
            index++;
        }
    }
    if (DEBUG) {
        int idx = 0;
        for (Stmt s : method.stmts) {
            if (s.st == Stmt.ST.LABEL) {
                LabelStmt label = (LabelStmt) s;
                label.displayName = "L" + idx++;
            }
        }
    }
    initCFG();
}