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Example 1 with Constraint

use of org.mapleir.ir.cfg.builder.ssaopt.Constraint in project maple-ir by LLVM-but-worse.

the class SSAGenPass method aggregateInitialisers.

private void aggregateInitialisers() {
    for (BasicBlock b : builder.graph.vertices()) {
        for (Stmt stmt : new ArrayList<>(b)) {
            if (stmt.getOpcode() == Opcode.POP) {
                PopStmt pop = (PopStmt) stmt;
                Expr expr = pop.getExpression();
                if (expr.getOpcode() == Opcode.INVOKE) {
                    InvocationExpr invoke = (InvocationExpr) expr;
                    if (invoke.getCallType() == InvocationExpr.CallType.SPECIAL && invoke.getName().equals("<init>")) {
                        Expr inst = invoke.getPhysicalReceiver();
                        if (inst.getOpcode() == Opcode.LOCAL_LOAD) {
                            VarExpr var = (VarExpr) inst;
                            VersionedLocal local = (VersionedLocal) var.getLocal();
                            AbstractCopyStmt def = pool.defs.get(local);
                            Expr rhs = def.getExpression();
                            if (rhs.getOpcode() == Opcode.ALLOC_OBJ) {
                                // replace pop(x.<init>()) with x := new Klass();
                                // remove x := new Klass;
                                // here we are assuming that the new object
                                // can't be used until it is initialised.
                                Expr[] args = invoke.getParameterExprs();
                                // we want to reuse the exprs, so free it first.
                                pop.deleteAt(0);
                                Expr[] newArgs = Arrays.copyOf(args, args.length);
                                for (int i = args.length - 1; i >= 0; i--) {
                                    args[i].unlink();
                                }
                                // remove the old def
                                def.delete();
                                int index = b.indexOf(pop);
                                // add a copy statement before the pop (x = newExpr)
                                InitialisedObjectExpr newExpr = new InitialisedObjectExpr(invoke.getOwner(), invoke.getDesc(), newArgs);
                                CopyVarStmt newCvs = new CopyVarStmt(var, newExpr);
                                pool.defs.put(local, newCvs);
                                pool.uses.get(local).remove(var);
                                b.add(index, newCvs);
                                // remove the pop statement
                                b.remove(pop);
                                // update the latestval constraints
                                LatestValue lval = latest.get(local);
                                if (lval.hasConstraints()) {
                                    /* need to check this out (shouldn't happen) */
                                    System.out.println("Constraints:");
                                    for (Constraint c : lval.getConstraints()) {
                                        System.out.println("  " + c);
                                    }
                                    throw new IllegalStateException(lval.toString());
                                } else {
                                    lval.makeConstraints(newExpr);
                                }
                            }
                        } else if (inst.getOpcode() == Opcode.ALLOC_OBJ) {
                            // replace pop(new Klass.<init>(args)) with pop(new Klass(args))
                            // UninitialisedObjectExpr obj = (UninitialisedObjectExpr) inst;
                            Expr[] args = invoke.getParameterExprs();
                            // we want to reuse the exprs, so free it first.
                            invoke.unlink();
                            for (Expr e : args) {
                                e.unlink();
                            }
                            Expr[] newArgs = Arrays.copyOf(args, args.length);
                            InitialisedObjectExpr newExpr = new InitialisedObjectExpr(invoke.getOwner(), invoke.getDesc(), newArgs);
                            // replace pop contents
                            // no changes to defs or uses
                            pop.setExpression(newExpr);
                        } else {
                            System.err.println(b);
                            System.err.println("Stmt: " + stmt.getDisplayName() + ". " + stmt);
                            System.err.println("Inst: " + inst);
                            System.err.println(builder.graph);
                            throw new RuntimeException("interesting1 " + inst.getClass());
                        }
                    }
                }
            }
        }
    }
}
Also used : VersionedLocal(org.mapleir.ir.locals.impl.VersionedLocal) Constraint(org.mapleir.ir.cfg.builder.ssaopt.Constraint) CopyVarStmt(org.mapleir.ir.code.stmt.copy.CopyVarStmt) BasicBlock(org.mapleir.ir.cfg.BasicBlock) InitialisedObjectExpr(org.mapleir.ir.code.expr.invoke.InitialisedObjectExpr) Constraint(org.mapleir.ir.cfg.builder.ssaopt.Constraint) SwitchStmt(org.mapleir.ir.code.stmt.SwitchStmt) CopyVarStmt(org.mapleir.ir.code.stmt.copy.CopyVarStmt) PopStmt(org.mapleir.ir.code.stmt.PopStmt) ThrowStmt(org.mapleir.ir.code.stmt.ThrowStmt) UnconditionalJumpStmt(org.mapleir.ir.code.stmt.UnconditionalJumpStmt) Stmt(org.mapleir.ir.code.Stmt) CopyPhiStmt(org.mapleir.ir.code.stmt.copy.CopyPhiStmt) ConditionalJumpStmt(org.mapleir.ir.code.stmt.ConditionalJumpStmt) AbstractCopyStmt(org.mapleir.ir.code.stmt.copy.AbstractCopyStmt) LatestValue(org.mapleir.ir.cfg.builder.ssaopt.LatestValue) ConstantExpr(org.mapleir.ir.code.expr.ConstantExpr) InitialisedObjectExpr(org.mapleir.ir.code.expr.invoke.InitialisedObjectExpr) InvocationExpr(org.mapleir.ir.code.expr.invoke.InvocationExpr) VarExpr(org.mapleir.ir.code.expr.VarExpr) Expr(org.mapleir.ir.code.Expr) PhiExpr(org.mapleir.ir.code.expr.PhiExpr) PopStmt(org.mapleir.ir.code.stmt.PopStmt) VarExpr(org.mapleir.ir.code.expr.VarExpr) AbstractCopyStmt(org.mapleir.ir.code.stmt.copy.AbstractCopyStmt) InvocationExpr(org.mapleir.ir.code.expr.invoke.InvocationExpr)

Aggregations

BasicBlock (org.mapleir.ir.cfg.BasicBlock)1 Constraint (org.mapleir.ir.cfg.builder.ssaopt.Constraint)1 LatestValue (org.mapleir.ir.cfg.builder.ssaopt.LatestValue)1 Expr (org.mapleir.ir.code.Expr)1 Stmt (org.mapleir.ir.code.Stmt)1 ConstantExpr (org.mapleir.ir.code.expr.ConstantExpr)1 PhiExpr (org.mapleir.ir.code.expr.PhiExpr)1 VarExpr (org.mapleir.ir.code.expr.VarExpr)1 InitialisedObjectExpr (org.mapleir.ir.code.expr.invoke.InitialisedObjectExpr)1 InvocationExpr (org.mapleir.ir.code.expr.invoke.InvocationExpr)1 ConditionalJumpStmt (org.mapleir.ir.code.stmt.ConditionalJumpStmt)1 PopStmt (org.mapleir.ir.code.stmt.PopStmt)1 SwitchStmt (org.mapleir.ir.code.stmt.SwitchStmt)1 ThrowStmt (org.mapleir.ir.code.stmt.ThrowStmt)1 UnconditionalJumpStmt (org.mapleir.ir.code.stmt.UnconditionalJumpStmt)1 AbstractCopyStmt (org.mapleir.ir.code.stmt.copy.AbstractCopyStmt)1 CopyPhiStmt (org.mapleir.ir.code.stmt.copy.CopyPhiStmt)1 CopyVarStmt (org.mapleir.ir.code.stmt.copy.CopyVarStmt)1 VersionedLocal (org.mapleir.ir.locals.impl.VersionedLocal)1