Index of the b0 helper column in the stack trace. This column holds the current stack depth.
Index of the b1 helper column in the stack trace. This column holds the address of the top
item in the stack overflow table.
Index of the h0 helper column in the stack trace. This column contains 1 / (b0 - 16) when
b0 != 16, and ZERO otherwise.
Number of bookkeeping and helper columns in the stack trace.
Index at which stack item columns start in the stack trace.
Location of stack top items in the stack trace.
The number of stack registers which can be accessed by the VM directly. This is also the
minimum stack depth enforced by the VM.