Any method to get the stack size of all functions in a file or a project in C language?

I want to get all function开发者_运维技巧s whose stack size is bigger than the assigned size, is there any easy method to suggest?

Get the .obj file, disassemble it, and then analyze the output file?

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You can look at the assembly dump for each function. In gcc, you use the -S option.

Let's say you are interested in the function foo. Then, gcc mangles the function name to _foo. If you take a peek at the assembly, you should see, near the top of the function, an instruction to move the stack pointer. For example, in OSX you have something like:

_foo:
    ...
    movq %rsp, %rbp
    ...
    subq $48, %rsp

That number, $48, is the stack size.

Alternatively, you can look for the equivalent command using nm to find the address where the function starts, ndisasm to give you a human readable dump, and then scanning for the where the stack pointer is moved.

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Outside of embedded computing, infinite recursion is much more likely culprit in stack overflow than any particular call.

That being said, in the first approximation, look for locally-allocated arrays:

void foo() {
    ...
    char buffer[1024] = "";
    ...
}

Also, don't forget alloca() call - it dynamically allocates space on the stack the same way malloc() allocates it on the heap.