Examples with VarExpr org.mapleir.ir.code.expr.VarExpr used on opensource projects

Example 6 with VarExpr

use of org.mapleir.ir.code.expr.VarExpr in project maple-ir by LLVM-but-worse.

the class SSABlockLivenessAnalyser method precomputeBlock.

// compute def, use, and phi for given block
private void precomputeBlock(BasicBlock b) {
    def.getNonNull(b);
    use.getNonNull(b);
    phiUse.getNonNull(b);
    phiDef.getNonNull(b);
    // we have to iterate in reverse order because a definition will kill a use in the current block
    // this is so that uses do not escape a block if its def is in the same block. this is basically
    // simulating a statement graph analysis
    ListIterator<Stmt> it = b.listIterator(b.size());
    while (it.hasPrevious()) {
        Stmt stmt = it.previous();
        int opcode = stmt.getOpcode();
        if (opcode == Opcode.PHI_STORE) {
            CopyPhiStmt copy = (CopyPhiStmt) stmt;
            phiDef.get(b).add(copy.getVariable().getLocal());
            PhiExpr phi = copy.getExpression();
            for (Map.Entry<BasicBlock, Expr> e : phi.getArguments().entrySet()) {
                BasicBlock exprSource = e.getKey();
                Expr phiExpr = e.getValue();
                GenericBitSet<Local> useSet = phiUse.get(b).getNonNull(exprSource);
                if (phiExpr.getOpcode() == Opcode.LOCAL_LOAD) {
                    useSet.add(((VarExpr) phiExpr).getLocal());
                } else
                    for (Expr child : phiExpr.enumerateOnlyChildren()) {
                        if (child.getOpcode() == Opcode.LOCAL_LOAD) {
                            useSet.add(((VarExpr) child).getLocal());
                        }
                    }
            }
        } else {
            if (opcode == Opcode.LOCAL_STORE) {
                CopyVarStmt copy = (CopyVarStmt) stmt;
                Local l = copy.getVariable().getLocal();
                def.get(b).add(l);
                use.get(b).remove(l);
                Expr e = copy.getExpression();
                // adding it as live-in.
                if (e.getOpcode() == Opcode.CATCH) {
                    if (hasNaturalPredecessors(cfg, b)) {
                        use.get(b).add(l);
                    }
                }
            }
            for (Expr c : stmt.enumerateOnlyChildren()) {
                if (c.getOpcode() == Opcode.LOCAL_LOAD) {
                    VarExpr v = (VarExpr) c;
                    use.get(b).add(v.getLocal());
                }
            }
        }
    }
}

Example 7 with VarExpr

use of org.mapleir.ir.code.expr.VarExpr in project maple-ir by LLVM-but-worse.

the class SSADefUseMap method build.

protected void build(BasicBlock b, Stmt stmt, Set<Local> usedLocals) {
    if (stmt instanceof AbstractCopyStmt) {
        AbstractCopyStmt copy = (AbstractCopyStmt) stmt;
        Local l = copy.getVariable().getLocal();
        defs.put(l, b);
        if (copy instanceof CopyPhiStmt) {
            phiDefs.put(l, (CopyPhiStmt) copy);
            PhiExpr phi = (PhiExpr) copy.getExpression();
            for (Entry<BasicBlock, Expr> en : phi.getArguments().entrySet()) {
                Local ul = ((VarExpr) en.getValue()).getLocal();
                uses.getNonNull(ul).add(en.getKey());
                phiUses.get(b).add(ul);
            }
            return;
        }
    }
    for (Local usedLocal : usedLocals) uses.getNonNull(usedLocal).add(b);
}

Example 8 with VarExpr

use of org.mapleir.ir.code.expr.VarExpr in project maple-ir by LLVM-but-worse.

the class SSADefUseMap method computeWithIndices.

public void computeWithIndices(List<BasicBlock> preorder) {
    defs.clear();
    uses.clear();
    phiDefs.clear();
    phiUses.clear();
    lastUseIndex.clear();
    defIndex.clear();
    int index = 0;
    Set<Local> usedLocals = new HashSet<>();
    for (BasicBlock b : preorder) {
        for (Stmt stmt : b) {
            phiUses.getNonNull(b);
            usedLocals.clear();
            for (Expr s : stmt.enumerateOnlyChildren()) if (s.getOpcode() == Opcode.LOCAL_LOAD)
                usedLocals.add(((VarExpr) s).getLocal());
            buildIndex(b, stmt, index++, usedLocals);
            build(b, stmt, usedLocals);
        }
    }
}

Example 9 with VarExpr

use of org.mapleir.ir.code.expr.VarExpr in project maple-ir by LLVM-but-worse.

the class SreedharDestructor method csaa_iii.

// ============================================================================================================= //
// =================================================== CSSA ==================================================== //
// ============================================================================================================= //
private void csaa_iii() {
    // iterate over each phi expression
    for (Entry<Local, CopyPhiStmt> entry : defuse.phiDefs.entrySet()) {
        // System.out.println("process phi " + entry.getValue());
        // x0
        Local phiTarget = entry.getKey();
        CopyPhiStmt copy = entry.getValue();
        // l0
        BasicBlock defBlock = defuse.defs.get(phiTarget);
        PhiExpr phi = copy.getExpression();
        candidateResourceSet.clear();
        unresolvedNeighborsMap.clear();
        // Initialize phiResources set for convenience
        final GenericBitSet<PhiResource> phiResources = phiResSetCreator.create();
        phiResources.add(new PhiResource(defBlock, phiTarget, true));
        for (Entry<BasicBlock, Expr> phiEntry : phi.getArguments().entrySet()) phiResources.add(new PhiResource(phiEntry.getKey(), ((VarExpr) phiEntry.getValue()).getLocal(), false));
        // Determine what copies are needed using the four cases.
        handleInterference(phiResources);
        // Process unresolved resources
        resolveDeferred();
        // System.out.println("  Cand: " + candidateResourceSet);
        // Resolve the candidate resources
        Type phiType = phi.getType();
        for (PhiResource toResolve : candidateResourceSet) {
            if (toResolve.isTarget)
                resolvePhiTarget(toResolve, phiType);
            else
                for (Entry<BasicBlock, Expr> phiArg : phi.getArguments().entrySet()) {
                    VarExpr phiVar = (VarExpr) phiArg.getValue();
                    if (phiVar.getLocal() == toResolve.local)
                        phiVar.setLocal(resolvePhiSource(toResolve.local, phiArg.getKey(), phiType));
                }
        }
        // System.out.println("  interference: ");
        // for (Entry<Local, GenericBitSet<Local>> entry2 : interfere.entrySet())
        // System.out.println("    " + entry2.getKey() + " : " + entry2.getValue());
        // System.out.println("  post-inserted: " + copy);
        // Merge pccs for all locals in phi
        final GenericBitSet<Local> phiLocals = locals.createBitSet();
        phiLocals.add(copy.getVariable().getLocal());
        for (Entry<BasicBlock, Expr> phiEntry : phi.getArguments().entrySet()) phiLocals.add(((VarExpr) phiEntry.getValue()).getLocal());
        for (Local phiLocal : phiLocals) pccs.put(phiLocal, phiLocals);
        // Nullify singleton pccs
        for (GenericBitSet<Local> pcc : pccs.values()) if (pcc.size() <= 1)
            pcc.clear();
    // System.out.println("  pccs:");
    // for (Entry<Local, GenericBitSet<Local>> entry2 : pccs.entrySet())
    // System.out.println("    " + entry2.getKey() + " : " + entry2.getValue());
    // System.out.println();
    }
}

Example 10 with VarExpr

use of org.mapleir.ir.code.expr.VarExpr in project maple-ir by LLVM-but-worse.

the class SreedharDestructor method coalesce.

// ============================================================================================================= //
// ================================================== Coalescing =============================================== //
// ============================================================================================================= //
private void coalesce() {
    for (BasicBlock b : cfg.vertices()) {
        for (Iterator<Stmt> it = b.iterator(); it.hasNext(); ) {
            Stmt stmt = it.next();
            if (stmt instanceof CopyVarStmt) {
                CopyVarStmt copy = (CopyVarStmt) stmt;
                // System.out.println("check " + copy);
                if (checkCoalesce(copy)) {
                    // System.out.println("  coalescing");
                    // Remove the copy
                    it.remove();
                    // Merge pccs
                    GenericBitSet<Local> pccX = pccs.get(copy.getVariable().getLocal());
                    Local localY = ((VarExpr) copy.getExpression()).getLocal();
                    GenericBitSet<Local> pccY = pccs.get(localY);
                    pccX.add(localY);
                    pccX.addAll(pccY);
                    for (Local l : pccY) pccs.put(l, pccX);
                }
            }
        }
    }
// System.out.println("post-coalsce pccs:");
// for (Entry<Local, GenericBitSet<Local>> entry : pccs.entrySet())
// System.out.println("  " + entry.getKey() + " : " + entry.getValue());
// System.out.println();
}