WEBVTT 00:01.070 --> 00:04.340 Hello and welcome to today's lecture. 00:04.340 --> 00:11.210 In this lecture, we are going to delve into the fascinating world of debugging and code execution analysis 00:11.210 --> 00:16.580 using a powerful tool known as data display debugger or triple D. 00:16.850 --> 00:22.310 So if you are a Linux enthusiast or software developer looking to enhance your debugging skills, you 00:22.310 --> 00:24.530 will learn that topic in this course. 00:24.530 --> 00:32.810 So let's jump right in the data display debugger, often abbreviated as d, d d is an indispensable 00:32.810 --> 00:38.750 debugging tool that comes with a user friendly graphical interface tailored for the Linux operating 00:38.750 --> 00:39.380 system. 00:39.380 --> 00:46.070 Its primary objective is to assist developers in diagnosing, understanding and rectifying issues with 00:46.070 --> 00:51.380 their code by providing an intuitive visual representation of program execution. 00:51.380 --> 00:57.710 So triple D, d, d, d, also known as the empowers developers to analyze the behavior of their code 00:57.710 --> 01:03.120 step by step, making the debugging process more efficient and productive. 01:03.150 --> 01:09.570 So before we dive deeper, uh, let's ensure you have a d d d up and running on your system. 01:10.020 --> 01:11.580 Installation is a breeze. 01:11.580 --> 01:15.690 Just open your terminal and execute this sudo here. 01:15.690 --> 01:22.350 Sudo apt install d d d and enter your password for account. 01:22.350 --> 01:23.430 And that's it. 01:23.430 --> 01:28.740 So this will fetch and install the package from your linux package manager. 01:28.740 --> 01:35.430 And once installed you will be ready to harness the power of triple D to its fullest potential. 01:35.430 --> 01:42.330 So before we proceed further, let's take a moment to understand why debugging is such a crucial aspect 01:42.330 --> 01:43.920 of software development. 01:43.920 --> 01:51.840 So even most experienced developers encounter bugs, unexpected behaviors and logical errors in their 01:51.840 --> 01:52.260 code. 01:52.260 --> 02:00.540 So debugging helps us identify, isolate and correct these issues, ensuring our programs run smoothly 02:00.540 --> 02:02.520 and reliably d d. 02:02.520 --> 02:11.040 D acts as a guiding light in this process, allowing us to gain insights into how our code is executed 02:11.040 --> 02:13.800 and where potential pitfalls lie. 02:14.010 --> 02:22.050 So to give you practical examples of D these capabilities, we will embark on our coding journey together. 02:22.050 --> 02:27.060 So in this section we will be working on a program that might not produce any visible output. 02:27.090 --> 02:32.550 However, our goal is not to see the output, but to explore the intricacies of the code, execution 02:32.550 --> 02:34.680 and concepts registers here. 02:34.680 --> 02:45.110 So but we will also, um, we might add some outputs here, but now we will need to open our this system 02:45.120 --> 02:47.100 and start our. 02:47.950 --> 02:49.440 Uh, process here. 02:49.450 --> 02:55.510 But, uh, here now, we will need to open the system, so we will name our. 02:59.630 --> 03:04.890 Then click on Create new project, delete this existing project here and that's it. 03:04.910 --> 03:12.140 So here, after installing the data display debugger, we will just write this short code here, which 03:12.800 --> 03:17.680 we will move this here and we will name it move that ASM here. 03:17.690 --> 03:27.650 So add the command, move that ASM, add the section data here so we will add almost six numbers be 03:27.800 --> 03:34.640 nom nom de nom and ki nam one ki nam two and ki nam three. 03:34.640 --> 03:35.300 Here. 03:35.930 --> 03:45.860 Now let's add this here be Nam db here DB one, two, three, W num. 03:45.860 --> 03:49.040 So these are the data variables here that we will use. 03:49.250 --> 03:53.720 W d is one, two, three, 45D num. 03:54.510 --> 04:00.390 Uh DD1, two, three, four, five, six, seven, 890. 04:00.660 --> 04:03.660 And q num one. 04:05.250 --> 04:07.560 D Q Here is. 04:09.650 --> 04:15.830 Is going to be like, you know, from 1 to 0 and 1 to 9, one to. 04:17.880 --> 04:18.270 Here. 04:21.520 --> 04:22.180 That's it. 04:22.210 --> 04:26.380 And we will also add M2 and M3 here. 04:27.250 --> 04:31.270 M2 is again available to the queue here. 04:31.450 --> 04:35.380 And one, two, three, four, five, six here. 04:35.500 --> 04:38.860 And queue number three is going to be the queue. 04:38.890 --> 04:43.620 This is going to be our number point 14. 04:43.630 --> 04:48.130 So we will also add this section VSS here. 04:49.630 --> 04:50.290 Action. 04:51.070 --> 04:55.690 We will not write anything for it and we will also add action text. 04:55.720 --> 04:57.670 Then we will create a global main. 04:59.240 --> 05:01.820 And in main function here. 05:02.440 --> 05:04.060 They will firstly pass. 05:05.680 --> 05:06.190 Uh, we will. 05:06.190 --> 05:08.200 Firstly, in this main function, we will pass the. 05:08.230 --> 05:12.970 Yes, uh, we will push the RPC and. 05:16.520 --> 05:17.180 Here? 05:17.360 --> 05:18.320 Uh parsh. 05:18.780 --> 05:19.250 RB. 05:20.610 --> 05:21.270 He. 05:22.360 --> 05:25.960 Who RSVP'd to RSVP. 05:27.940 --> 05:28.870 Racks. 05:31.310 --> 05:32.000 And this one. 05:32.000 --> 05:33.740 So this is to. 05:35.000 --> 05:36.350 Uh, this is Phil. 05:37.210 --> 05:39.480 The racks with once. 05:41.610 --> 05:46.080 And move a little bit. 05:46.980 --> 05:50.550 And here we will enter the byte num here. 05:51.300 --> 05:53.320 The p norm. 05:53.790 --> 06:08.160 This is this actually does not clear upper bits of rax so does not does not clear upper bits of Rax. 06:08.160 --> 06:14.610 So you can also write the crucial points like upper case here. 06:15.560 --> 06:17.360 Uh, to make attention. 06:19.450 --> 06:24.220 So we will also add X or here. 06:35.020 --> 06:39.370 Better so x or racks rax here. 06:39.460 --> 06:44.050 So this is for the, uh, clearing the rax. 06:47.300 --> 06:52.220 Clear the racks and move again. 06:59.690 --> 07:02.930 L and bite here. 07:03.640 --> 07:11.830 So again, we will pass this beenham here to make the rags to have the correct value here with this. 07:13.270 --> 07:21.070 In in here we have now racks has the correct value. 07:21.910 --> 07:25.720 And after that we will move the racks minus one. 07:25.720 --> 07:27.880 So we will fill the. 07:28.880 --> 07:30.720 Racks with ones. 07:32.980 --> 07:35.710 And here, Rex. 07:37.000 --> 07:37.690 One. 07:39.380 --> 07:43.630 Or will racks with once. 07:44.930 --> 07:51.800 And after that, move the axe here to war here. 07:51.800 --> 07:54.260 And we will also pass the numb here. 07:55.440 --> 07:56.370 W nom. 07:56.670 --> 08:00.600 This does not clear the upper bits of rax again. 08:01.820 --> 08:03.710 Actually, since we are. 08:04.700 --> 08:08.180 Again copying this here so it will be better. 08:09.140 --> 08:11.630 As one spaces new lines here. 08:13.220 --> 08:23.630 So fill racks with once and again this does does not clear does not clear upper bits of racks. 08:24.970 --> 08:27.470 And again XOR here. 08:27.970 --> 08:28.740 Racks. 08:28.810 --> 08:31.330 Racks Here we are clearing the racks. 08:31.330 --> 08:34.930 You you learned that X or in lecture actually. 08:34.930 --> 08:38.740 But it's same here and now. 08:38.740 --> 08:42.910 We will move the ax word. 08:44.150 --> 08:45.530 W name again. 08:45.530 --> 08:55.580 And here again our now racks again here now Racks has the correct value. 08:57.360 --> 08:59.700 And after that we will move the. 09:01.980 --> 09:04.350 We will move the racks. 09:06.960 --> 09:09.210 Rags minus one. 09:09.480 --> 09:10.680 This is for. 09:12.200 --> 09:17.720 Uh, fill racks with ones and move racks. 09:22.250 --> 09:23.630 He walked here. 09:25.170 --> 09:28.350 In this case, we will also pass the Num one. 09:28.440 --> 09:29.490 This again. 09:29.490 --> 09:34.380 Uh, does does this actually, uh, does clear upper. 09:35.490 --> 09:43.350 It's off racks and you will learn why these are not actually, this one is clear. 09:43.440 --> 09:43.950 Right. 09:44.460 --> 09:50.880 So now we're going to do after that is we will, uh, make that one apparent. 09:50.880 --> 09:51.380 Um. 09:52.380 --> 09:54.120 Always in a register. 09:54.120 --> 09:59.310 And after that we will need to source operand to an immediate value. 09:59.400 --> 10:02.030 So we'll learn that here. 10:02.730 --> 10:04.530 Or here. 10:05.260 --> 10:07.090 You numb to. 10:08.790 --> 10:10.440 Racks here. 10:11.160 --> 10:13.500 One operand. 10:13.500 --> 10:17.490 Always a register. 10:20.120 --> 10:22.880 And move here Cracks. 10:28.590 --> 10:33.330 This is the source of her. 10:36.310 --> 10:36.680 Um. 10:37.390 --> 10:40.060 Immediate value. 10:42.090 --> 10:42.390 Move. 10:42.510 --> 10:46.380 KXM0 here. 10:48.360 --> 10:48.750 And. 10:52.360 --> 10:52.500 X. 10:52.590 --> 10:53.980 X zero. 10:55.640 --> 10:56.510 And here. 10:56.510 --> 10:58.460 Paascu Norm three. 11:02.830 --> 11:04.310 The instruction. 11:05.440 --> 11:09.840 And floating point. 11:09.840 --> 11:13.220 And after that we will move RSP. 11:14.960 --> 11:15.140 To. 11:18.220 --> 11:20.800 And pop here. 11:21.590 --> 11:23.810 And after that, we'll finally read. 11:23.840 --> 11:25.990 So we will save the source file. 11:26.010 --> 11:32.420 A source file as the move that move that RSM. 11:33.740 --> 11:39.890 And we will build and run it to see if it works in the next lecture. 11:39.890 --> 11:41.090 So actually, let's. 11:42.690 --> 11:44.410 Create a new folder. 11:44.430 --> 11:45.270 Move. 11:48.240 --> 11:50.880 And I will save it. 11:51.120 --> 11:52.830 Move that --. 11:53.700 --> 11:54.420 So that's it. 11:54.420 --> 11:56.430 And I'm waiting you in next lecture.