c++ - How to find where a library call returns? -

-

I am analyzing an external Fortran library which is quite large. Anyway, I want to fit the values ​​of parameters for the function of the entire library. Entry Point is a method called calligraphic parameters.

The problem is that sometimes call returns are very fast, and the prices decrease in prices, they also come from random number generators. The question is: Does GDB (or some other debugger) have a way to see where the return was withdrawn from the library system? I have a source and they have already compiled with -g BTW, I use g ++ and gfortran to compile I am I can not go through the sources manually or execute the line by line, since the whole code is the line of code dirty code ~ 10k .

An idea that came to my mind was to go through the source code and find all the possible returns and set breakpoints on them, but is there any other way?

Run GDB, help type or next help < / Code> and you can see the details of the next command that basically progresses in your program.

What you can do, run from the program step by step (using next ), and then from there, at the beginning of the Breakpoint function, and see that this function Where does it go?

If the program is huge, you can find binary return point. It is a breakpoint set at the beginning of the function and then from there for example next 500 if you do not get the function out You have come, you have taken many steps, so go ahead and take a few steps next time, for example, next 250 If you were still in the function, how much steps can you take, You can take more steps to find out what your Own increase. So if you say another time next 500 and you were out of the function, then you start and this time start with next 750 .

Edit 2: Try to see that it works:

Put a break at the beginning of the ceremony and go inside it. Then type (in the GDB course) to run until the finish function is ended. Then (this is the part that I'm not sure that it will work correctly), type reverse-phase and exit the action, to move backwards! (How is it cool ?!)

Comments

Post a Comment

Popular posts from this blog

mysql - BLOB/TEXT column 'value' used in key specification without a key length -

-
I have developed an extension which works up to 1.6 on Magren (I'm trying Enterprise Edition, And I think the community is the same problem, because it is the same code). In my install script, I see the $ installer-> gt; CreateEntityTables ($ this- & gt; getTable ('alphanum / info')); The installation is done until it is not in the _text unit table. It crashed there! It turns out that when I log in to SQL and run it via PHPmyadmin, then this error is: Blob / Text column 'value' is used without the key 'key' . I saw the code there, and this is what is trying to create an index on the value column: -> addIndex ($ this- & gt; getIdxName ($ eavTableName, array ( 'attribute_id array (' attribute_id ',' value ')) - & gt; addIndex ($ this- & gt; getIdxName ($ eavTableName, array (' entity_type_id ' , 'Value')), array ('entity_type_id', 'value')) If there is no if statement is n...
Read more

c# - Using Vici cool Storage with monodroid -

-
Oh, for the moment I am not sure how it is officially supported, but for the success of the people Using Monodroid Vic Cool Storage I am able to leave and compile assemblies in my project, but while trying to use some classes, the errors of time have to be gathered. Especially when trying to connect like the example for Mono Touch string dbName = path. Cobain (environment. Gatefolder path (environment specialfolder personal), "mydb.db3"); // The following line will be called coolestation, where is the database, // to make it if it does not exist, and call a delegate that creates the necessary tables (only when the database file was newly created //) CSConfig.SetDB (DbName, true, () => {CSDatabase.ExecuteNonQuery ("Subscriber Integer Primary Key Attribute, Name Text (50) No, Number, Date First Text (30)");); There is no difference when I try to use the methods of CSConfig and when I cscfif If I try to pass 3 aggregates to STDB (3) then I get the invalid ...
Read more

python - referencing a variable in another function? -

-
I am an experienced TCL developer and write my own processes to help myself. I call it a proc i callVar, print out the value of the variable in a certain format, so I know that it is variable and what is the value "set foo 1; putVar foo" result 'foo = "1" I want to do the same thing in Python, but I can not find the answer :( In TCL I use the up command because when I pass the name of the variable, then I can see the value at the top. . I understand that an advanced light in the dragon There is no mechanism of r, but with its introspection capability, I would think that this is something trivial, but I am not getting the answer anywhere. It seems that this should work: and expanded: def foo (): y = "Hello World" printwor ("y") foo () y = "Hello World " You can, but you should not do so if your code is correct If is needed , then there is something wrong with your design, and you should probably use the dictionar...
Read more