instrumentation-diagram

caller

function() {
    return i++;
}

: Frame

function() {
    var i = 0;
    return function() {
        return i++;
    };
};

: Frame

i: 0

var counter = function() {
    var i = 0;
    return function() {
        return i++;
    };
};
var mycounter = counter();
mycounter();

: Frame

counter: fun()
mycounter: fun()

outer scope

outer scope

lexical scope

function

return function() {
    return i++;
};

mycounter : Function

Sequence(
 Return(
  PostOp(
   Variable(i)
   ++
  )
 )
)

 : ASTFunction

AST

Disconnected

Debugging with Source Code Instrumentation - Example Stack

One unsolved problem of the simulated stack is that a complete stack trace
is not a linear list of frames but more a DAG (directed acyclic graph).

Capturing the stack also needs to capture the complete graph structure,
including shared inner nodes.

caller

scope

scope

caller

caller