How to print all source code what was running?

[User 13049321]

The problem is I don't know where are the "condition is met". Whether input's iVal is 1 or 2, first hundreds line code execution are equals. I want to find first diffence between 1 and 2 (iVal), and I sured the diffence appeared after "execution long line codes ago".

[User 13049321]

Thanks, but I want to find a way that don't add any code like DEBUG_LOG(), to print source code. because the source code too many. I wouldn't be do this otherwise.

[Lost User]

Hi, You could use the [Debug Interface Access SDK](https://docs.microsoft.com/en-us/visualstudio/debugger/debug-interface-access/debug-interface-access-sdk?view=vs-2017) to get the exact line of 'source code' associated with any instruction offset in the executable. This is how WinDbg and Visual Studio knows where the line of source code is located. Using your sample:

main()
{
int iTemp = 0; __asm int 3;
fun(); __asm int 3;
iTemp = 1; __asm int 3;
}

Then add an exception hander for STATUS_BREAKPOINT (0x80000003) and call into DIA and pass the exception offset to get the source line. It's actually quite simple. However if you are looking to perform instrumentation at the instruction level then have a look at [DynamoRIO](https://www.dynamorio.org/) and specifically the [instrace_x86 sample](https://github.com/DynamoRIO/dynamorio/blob/master/api/samples/instrace\_x86.c). Best Wishes, -David Delaune

[HS_C_Student]

It's hard to understand your question. I think there are many better ways of solving the problem which might include restructuring the program, especially to make that section into smaller modules or to create your own debugging interface and pass parameters through it so you have a functional means of tracking program states. If you could tighten up input validation and narrow the scope of acceptable input it may help detect bugs. The way you want to do it printing code is not even remotely a standard functionality or common practice so it is a very oversized foot you are trying to shoehorn into a small shoe and the result will likely be as comfortable. If you want to pursue it anyway it's hard to imagine without knowing your code. You could set up a custom table of watch variables and or expressions and use the stringizing operator in a macro, similar to an assert() style. #define record_str (a) (fprintf(debug, "%s : %s", #a, a)) #define record_int(a) (fprintf(debug, "%s : %s", #a, itoa(a))) Combine it with __LINE__ and or FILE or TIME C/C++ line number - Stack Overflow[^] Hope this helps

[Victor Nijegorodov]

Suppose you have a block in your code like:

static int someNumber = 100000;
...
for(int i = 0; i < someNumber; ++i)
{
int a = 0;
...
double b = (double )a++;
...
// some more (ca. 20) lines
}

Now tell us how are you going to analyze those 20 * 100000 = 2 million lines of the executed code? :confused: :sigh:

[User 13049321]

Thank you

[User 13049321]

struct stNode
{
union sss_ {
struct sns_ {
int iType;
float fType;
} s_name;
} s_ss;

stNode\* pNext;

};

int FunA(stNode* pNode)
{
if (pNode->pNext->pNext->pNext->s_ss.s_name.iType>10)
{
...
pNode->pNext->s_ss.s_name.fType = 4.0f;
pNode->pNext = pNode->pNext + pNode->iType;

		return pNode->pNext->pNext->s\_ss.s\_name.iType;
}
pNode->pNext = pNode->pNext + pNode->iType;
pNode->pNext->s\_ss.s\_name.fType = 7.0f;
...
return pNode->s\_ss.s\_name.iType;

}

main()
{

int iVal = 2;

	for(int i = 0; i < 100; ++i)
	{		
		iVal++;

		stNode stMyNode;

		if (iVal<100)
		{
			iVal = FunA(&stMyNode+iVal);
		}
		else
		{
			iVal = FunB(&stMyNode+iVal);
		}
	}

}

With difference iVal initialization. the difference of execution occured at hundreds lines run after begin of main(). And, the actual code of mine, are complex than above are. Very very complex, run one FunA()，need a lot of times. (many lines code)

[User 13049321]

Using your method, I need add “__asm int 3;” for every line of code?

[Lost User]

Member 13081369 wrote:

Using your method, I need add “__asm int 3;” for every line of code?

No, You could set the hardware breakpoints at DR0-DR7 and automate every single-step through your entire program printing out each line of source code as it is executed by querying the [PDB file](https://blogs.msdn.microsoft.com/vcblog/2016/02/08/whats-inside-a-pdb-file/) associated with the executable via [DIA](https://docs.microsoft.com/en-us/visualstudio/debugger/debug-interface-access/debug-interface-access-sdk?view=vs-2017). What you are asking is absolutely possible but it's a lot of work. Are you sure that you need to do this? Best Wishes, -David Delaune

[User 13049321]

First, I sure. I run DIA SDK\Samples\DIA2Dump\Dia2Dump.exe myProgram.pdb I can view values and functions list when Dia2Dump.exe is run. But， How to "set the hardware breakpoints at DR0-DR7 and automate every single-step through your entire program"? Is modify dia2dump.cpp -> main(), start my program by dia2dump.exe? and WaitForDebugEvent(&dbgEvent, INFINITE); in dia2dump.exe? Can you give me a sample?

[Victor Nijegorodov]

Member 13081369 wrote:

... the actual code of mine, are complex than above are. Very very complex, run one FunA()，need a lot of times. (many lines code)

And how will you analyze such a "many lines code" in your "line output"? How much time would you need to just to look in this output?

[Stefan_Lang]

No it doesn't. You don't understand what you're asking for. Even if it would kind of work out for the very simple program you are looking at right now, it won't help you beyond that: the next time you're trying to understand some code, it won't be good enough, and you will eventually realize that you wasted a lot of time with a tool that, in the end, doesn't really help. Please take the advice from people who have spent decades on programming and using tools. The debugger is the second tool I learned to use after the editor, and it is still the most helpful tool I use today. Without it, large scale applications wouldn't be possible, and smaller ones would cost orders of magnitude more money and time to develop. With a debugger you can do the inspection you're asking for at runtime, and a lot more. You won't need to write one yourself, nyou won't have to wait for it's output to be written, and you won't waste ludicrous amouunts of storage space. It's better in any way you can think of.

GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)

[Stefan_Lang]

This response shows that you have really no understanding of what a debugger does, and how to use it. A debugger does not require you to add anything to your code at all. There's no need for a debugger to print code, nor to add any code to your program. You really should read this up before continuing to refuse the only sensible advice any experienced programmer can offer you on this problem: Debugger - Wikipedia[^]

GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)

[Stefan_Lang]

Why use the Visual Studio Debugger SDK, when you can just use the much more intuitive visual debugger that comes with the VS IDE? :confused:

GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)

[User 13049321]

If the code like below: if(iVal < 10) { FunA(); } else { FunB(); } When first run, iVal=1. So the first.txt Should be: if(iVal < 10) FunA(); And second run, iVal=20. The second.txt Should be: if(iVal < 10) FunB(); I could compared two file(first.txt and second.txt) to find code execution difference. I need it, because my codes very very larged. when iVal differeced every times, the differece appeard at after hundreds lines between first.txt and second.txt.

[Stefan_Lang]

If you are using Visual Studio, you can use its integrated debugger. Here is a guide to get started with it - it's really easy: Get started with Visual Studio 2017 - Debugging[^] If you are not using Visual Studio, you should tell us what you use, so someone can suggest a suitable debugger to use for that, and/or a quick guide to learn how to use it. The important things to know about debugging: 1. if you don't want to, you do not need to add any specialized code to your program to enable debugging. 2. You can tell your debugger that you want your program to stop if something specific happens. What you told us is quite easy to specify with Visual Studio: you can make the program run up to exactly the point where your iVal changes (see Data Breakpoints – Visual Studio 2017 15.8 Update   | Visual C++ Team Blog[^] ) 3. When using a debugger, you can not only make your program run up to a point, you can also inspect all variables, the call stack, and other aspects of the current state of your program. There are many more things that a debugger can help you with, e. g. change a variable at runtime, make the computer skip or repeat some code, etc.. All without changing the program code. But you have to learn the basics.

GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)

[Victor Nijegorodov]

Member 13081369 wrote:

I need it, because my codes very very larged. when iVal differeced every times, the differece appeard at after hundreds lines between first.txt and second.txt.

1. What do you mean by "codes very very larged"? How many lines does it contain? 1000? 10000? 100000? One million? 2. Did you try to estimate how long would it take you to compare these "first.txt and second.txt"?

[Stefan_Lang]

Neither 'Run to cursor' nor 'step over' (F10) are suitable functions for your problems. Either set a breakpoint within the code of the right if/else branch, or set a data breakpoint that stops execution the moment iVal changes its value: How to: Set a Data Breakpoint (Native Only) | Microsoft Docs[^]

GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)

[Lost User]

Hi Stefan, The poster is asking "How do I print each source line into a text file as my program is being executed?" Rather than belittle him I simply answered the question. In fact I just thought of a much easier way to do this using Powershell with the [Windbg COM interfaces](https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/client-com-interfaces) and [IDiaDataSource](https://docs.microsoft.com/en-us/visualstudio/debugger/debug-interface-access/idiadatasource?view=vs-2017) that doesn't require writing any code. He could just write a powershell script to automate it. Best Wishes, -David Delaune

[Lost User]

Member 13081369 wrote:

But， How to "set the hardware breakpoints at DR0-DR7 and automate every single-step through your entire program"?

With the [SetThreadContext function](https://docs.microsoft.com/en-us/windows/desktop/api/processthreadsapi/nf-processthreadsapi-setthreadcontext). It would be a great learning exercise for understanding both debugging and exception handling.

Member 13081369 wrote:

Can you give me a sample?

No, But I thought of another way to do this automated that would not require modifying your source code. [Dan Thompson](https://github.com/jazzdelightsme) has authored [DbgShell](https://github.com/Microsoft/DbgShell) which can be used from Powershell. With a simple powershell script you should be able to attach to your executable and single-step automated and then instantiate an [IDiaDataSource object](https://docs.microsoft.com/en-us/visualstudio/debugger/debug-interface-access/idiadatasource?view=vs-2017). Again, like the other members responding to you... I can't imagine why you would want to print each line of source code. Best Wishes, -David Delaune