Dbx 1024 User's Guide download pdf (Page 67)

Using Interactive Function Calls

To perform a complete dump of the program’s active variables, enter:

(dbx) dump .

> 0 foo2(i = 5) [“/usr/var/tmp/dbx_examples/foo.c”:46, 0x10001214]

1 foo(i = 4) [“/usr/var/tmp/dbx_examples/foo.c”:40, 0x100011d4]

r = 0

2 main(argc = 1, argv = 0xffffffad78) [“/usr/var/tmp/dbx_examples/

test4.c”:25, 0x10000fa0]

j = 4

i = 12

r = <bad operand>

a = 0

total = 0

Using Interactive Function Calls

You can interactively call a function in your program from dbx.

If the function returns a value, you can use that function in a normal dbx

expression. For example, consider a functionprime deﬁned in your program

that accepts an integer value as an argument, and returns 1 if the value is

prime and 0 if it is not. You can call this function interactively and print the

results by entering a command such as:

(dbx) print prime(7)

Using ccall

If your function does not return a value, or if you want to execute a function

primarily for its side effects, you can execute the function interactively with

the dbx command ccall:

ccall func(arg1, arg2, ... , argn)

This command calls a function with the given arguments.

Regardless of the language the function was written in, the

call is interpreted as if it were written in C, and normal C

calling conventions are used.

Note: Structure and union arguments to a function, and structure and union

returns from a function, are not supported.

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Dbx 1024 User's Guide Page 67