Examples of org.apache.bcel.verifier.structurals.InstructionContext.execute()

Package org.apache.bcel.verifier.structurals

Class org.apache.bcel.verifier.structurals.InstructionContext

Examples of org.apache.bcel.verifier.structurals.InstructionContext.execute()

org.apache.bcel.verifier.structurals.InstructionContext.execute()
This method symbolically executes the Instruction held in the InstructionContext. It "merges in" the incoming execution frame situation (see The Java Virtual Machine Specification, 2nd edition, page 146). By so doing, the outgoing execution frame situation is calculated. This method is JustIce-specific and is usually of no sense for users of the ControlFlowGraph class. They should use getInstruction().accept(Visitor), possibly in conjunction with the ExecutionVisitor. @see ControlFlowGraph @see ExecutionVisitor @see #getOutFrame(ArrayList) @return true - if and only if the "outgoing" frame situationchanged from the one before execute()ing.

        Vector ics = new Vector(); // Type: InstructionContext
        Vector ecs = new Vector(); // Type: ArrayList (of InstructionContext)


        InstructionContext start = cfg.contextOf(method.getInstructionList().getStart());


        start.execute(vanillaFrame, new ArrayList(), icv, ev);
        // new ArrayList() <=>  no Instruction was executed before
        //                  => Top-Level routine (no jsr call before)
        ics.add(start);
        ecs.add(new ArrayList());

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                // JSR that was recently executed.
                RET ret = (RET)u.getInstruction().getInstruction();
                ReturnaddressType t = (ReturnaddressType)u.getOutFrame(oldchain).getLocals().get(ret.getIndex());
                InstructionContext theSuccessor = cfg.contextOf(t.getTarget());


                if (theSuccessor.execute(u.getOutFrame(oldchain), newchain, icv, ev)) {
                    ics.add(theSuccessor);
                    ecs.add(newchain.clone());
                }
            } else { // "not a ret"
                // Normal successors. Add them to the queue of successors.

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            } else { // "not a ret"
                // Normal successors. Add them to the queue of successors.
                InstructionContext[] succs = u.getSuccessors();
                for (int s = 0; s < succs.length; s++) {
                    InstructionContext v = succs[s];
                    if (v.execute(u.getOutFrame(oldchain), newchain, icv, ev)) {
                        ics.add(v);
                        ecs.add(newchain.clone());
                    }
                }
            }

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                        (exc_hds[s].getExceptionType() == null
                        ? Type.THROWABLE
                        : exc_hds[s].getExceptionType()));
                Frame newFrame = new Frame(newLocals, newStack);


                if (v.execute(newFrame, new ArrayList(), icv, ev)) {
                    ics.add(v);
                    ecs.add(new ArrayList());
                }
            }
        }

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