Name of the calling function (ISIS/Slang) - Revision history

Kuehnel at 10:22, 2 May 2018

2018-05-02T10:22:55Z

Kuehnel: Created page with "Category:Isis / Slang In SLang a so-called ''frame'' specifies the execution of a closed piece of code, e.g., a function. All frames are pushed on to a frame stack and re..."

2018-05-02T10:20:06Z

Created page with "Category:Isis / Slang In SLang a so-called ''frame'' specifies the execution of a closed piece of code, e.g., a function. All frames are pushed on to a frame stack and re..."

New page

[[Category:Isis / Slang]]

In SLang a so-called ''frame'' specifies the execution of a closed piece of code, e.g., a function. All frames are pushed on to a frame stack and removed once the execution of a particular frame finishes. By accessing this frame stack it is possible to trace back, e.g., a function call.

There are a few functions in Slang available, which allows to receive information about frames (and even variables inside a particular frame!):
* _get_frame_depth
* _get_frame_info
* _get_frame_variable
* _set_frame_variable
* _use_frame_namespace

We can use this to get the name of the parent function, which executes a child function:
<pre>
define child() {
variable call = _get_frame_info(_get_frame_depth()-1);
if (call.function == NULL) { message("I was called from the command line"); }
else { vmessage("I was called by '%s'", _get_frame_info(_get_frame_depth-1).function); }
}

define parent() {
child();
}
</pre>
This will result in
<pre>
isis> child();
I was called from the command line
isis> parent();
I was called by 'parent'
</pre>

@@ Line 1: / Line 1: @@
 [[Category:Isis / Slang]]
-In SLang a so-called ''frame'' specifies the execution of a closed piece of code, e.g., a function. All frames are pushed on to a frame stack and removed once the execution of a particular frame finishes. By accessing this frame stack it is possible to trace back, e.g., a function call.
+In SLang a so-called ''frame'' specifies the execution of a closed piece of code, e.g., a function. All frames are pushed onto a frame stack and removed once the execution of a particular frame finishes. By accessing this frame stack it is possible to trace back, e.g., a function call.
 There are a few functions in Slang available, which allows to receive information about frames (and even variables inside a particular frame!):
@@ Line 15: / Line 15: @@
    variable call = _get_frame_info(_get_frame_depth()-1);
    if (call.function == NULL) { message("I was called from the command line"); }
-   else { vmessage("I was called by '%s'", _get_frame_info(_get_frame_depth-1).function); }
+   else { vmessage("I was called by '%s'", call.function); }
+}