/** * Replace instruction ih in list il with the instructions in new_il. If new_il is null, do * nothing */ protected static void replace_instructions( InstructionList il, InstructionHandle ih, InstructionList new_il) { if ((new_il == null) || new_il.isEmpty()) return; // If there is only one new instruction, just replace it in the handle if (new_il.getLength() == 1) { ih.setInstruction(new_il.getEnd().getInstruction()); return; } // Get the start and end instruction of the new instructions InstructionHandle new_end = new_il.getEnd(); InstructionHandle new_start = il.insert(ih, new_il); // Move all of the branches from the old instruction to the new start il.redirectBranches(ih, new_start); // Move other targets to the new instuctions. if (ih.hasTargeters()) { for (InstructionTargeter it : ih.getTargeters()) { if (it instanceof LineNumberGen) { it.updateTarget(ih, new_start); } else if (it instanceof LocalVariableGen) { it.updateTarget(ih, new_end); } else if (it instanceof CodeExceptionGen) { CodeExceptionGen exc = (CodeExceptionGen) it; if (exc.getStartPC() == ih) exc.updateTarget(ih, new_start); else if (exc.getEndPC() == ih) exc.updateTarget(ih, new_end); else if (exc.getHandlerPC() == ih) exc.setHandlerPC(new_start); else System.out.printf("Malformed CodeException: %s%n", exc); } else { System.out.printf("unexpected target %s%n", it); } } } // Remove the old handle. There should be no targeters left to it. try { il.delete(ih); } catch (Exception e) { throw new Error("Can't delete instruction", e); } }