Menu
I have an almost identical question as How to add code at the entry of every function? but for C:
As I'm maintaining someone else's large undocumented project, I wish to have code similar to
static C0UNT_identifier_not_used_anywhere_else = 0;
printf("%s%s:%d#%d", __func__, strrchr(__FILE__,'/'), __LINE__, ++C0UNT_identifier_not_used_anywhere_else);
to run on entry of every function, so that I
The existing code comprises hundreds of source files, so it is unfeasible to put a macro e.g.
#define ENTRY_CODE ...
...
int function() {
ENTRY_CODE
...
}
in every function. I am also not using DevStudio, Visual Studio or other compiler providing __cyg_profile_func_enter or such extensions.
Optionally, I'd like to printf the return value of each function on exit in a similar style. Can I do that too?
857
In C it is function main. But the program starts executing before the call to the main. That before main code prepares the execution environment for your program and it is called a startup code.
The _start Function. For most C and C++ programs, the true entry point is not main , it's the _start function. This function initializes the program runtime and invokes the program's main function.
The execution of a C program begins from the main() function. And, the compiler starts executing the codes inside functionName() . The control of the program jumps back to the main() function once code inside the function definition is executed. Note, function names are identifiers and should be unique.
No, it is not possible. When the main method exists, the program terminates.
Since you have tagged with gcc it has the -finstrument-functions option:
Generate instrumentation calls for entry and exit to functions. ...
155
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
