Report information on the C stack size and usage (if available).
An integer vector. This has named elements
The size of the stack (in bytes), or
NA if unknown.
The estimated current usage (in bytes), possibly
1 (stack grows down, the usual case) or
-1 (stack grows up).
The current evaluation depth (including two calls
for the call to
On most platforms, C stack information is recorded when R is
initialized and used for stack-checking. If this information is
size will be returned as
stack-checking is not performed.
The information on the stack base address is thought to be accurate on
Windows, Linux (using
glibc), macOS and FreeBSD but a heuristic
is used on other platforms. Because this might be slightly
inaccurate, the current usage could be estimated as negative. (The
heuristic is not used on embedded uses of R on platforms where the
stack base information is not thought to be accurate.)
The ‘evaluation depth’ is the number of nested R expressions
currently under evaluation: this has a limit controlled by