Hello.
I've now added some support to OCaml-R in order to investigate low-level
structures. See below for an output, concerning 'str'.
But I'm having an issue concerning SEXPs with type SYMSXP.
lazy
{content =
SYMSXP
{pname = lazy {content = NILSXP};
sym_value =
lazy
{content =
SYMSXP
{pname = lazy {content = NILSXP};
sym_value =
lazy
{content =
SYMSXP
{pname = <lazy>; sym_value = <lazy>; internal = <lazy>}};
internal = lazy {content = NILSXP}}};
internal = lazy {content = NILSXP}}};
It seems that the sym_value of a SYMSXP is a SYMSXP. But apparently they
seem to be different structures, as the pointers pointing to these
structures (the parent SYMSXP and the child SYMSXP) give different
addresses...
So I'm wondering: what's the structure of SYMSXPs? Is its sym_value
always a SYMSXP? I guess not. When its sym_value is a SYMSXP, is it
pointing to itself?
All the best,
Guillaume Yziquel.
# t;;
- : R.Internal.t = <lazy>
# unfold 1 t;;
- : unit = ()
# t;;
- : R.Internal.t =
lazy {content = PROMSXP {prom_value = <lazy>; expr = <lazy>; env = <lazy>}}
# unfold 2 t;;
- : unit = ()
# t;;
- : R.Internal.t =
lazy
{content =
PROMSXP
{prom_value =
lazy
{content =
SYMSXP {pname = <lazy>; sym_value = <lazy>; internal = <lazy>}};
expr =
lazy
{content = LANGSXP {carval = <lazy>; cdrval = <lazy>; tagval = <lazy>}};
env = lazy {content = ENVSXP}}}
# unfold 3 t;;
- : unit = ()
# t;;
- : R.Internal.t =
lazy
{content =
PROMSXP
{prom_value =
lazy
{content =
SYMSXP
{pname = lazy {content = NILSXP};
sym_value =
lazy
{content =
SYMSXP {pname = <lazy>; sym_value = <lazy>; internal = <lazy>}};
internal = lazy {content = NILSXP}}};
expr =
lazy
{content =
LANGSXP
{carval =
lazy
{content =
SYMSXP {pname = <lazy>; sym_value = <lazy>; internal = <lazy>}};
cdrval =
lazy
{content =
LISTSXP {carval = <lazy>; cdrval = <lazy>; tagval = <lazy>}};
tagval = lazy {content = NILSXP}}};
env = lazy {content = ENVSXP}}}
# unfold 4 t;;
- : unit = ()
# t;;
- : R.Internal.t =
lazy
{content =
PROMSXP
{prom_value =
lazy
{content =
SYMSXP
{pname = lazy {content = NILSXP};
sym_value =
lazy
{content =
SYMSXP
{pname = lazy {content = NILSXP};
sym_value =
lazy
{content =
SYMSXP
{pname = <lazy>; sym_value = <lazy>; internal = <lazy>}};
internal = lazy {content = NILSXP}}};
internal = lazy {content = NILSXP}}};
expr =
lazy
{content =
LANGSXP
{carval =
lazy
{content =
SYMSXP
{pname = lazy {content = CHARSXP};
sym_value = lazy {content = BUILTINSXP};
internal = lazy {content = NILSXP}}};
cdrval =
lazy
{content =
LISTSXP
{carval = lazy {content = INTSXP};
cdrval =
lazy
{content =
LISTSXP
{carval = <lazy>; cdrval = <lazy>; tagval = <lazy>}};
tagval = lazy {content = NILSXP}}};
tagval = lazy {content = NILSXP}}};
env = lazy {content = ENVSXP}}}
--
Guillaume Yziquel
http://yziquel.homelinux.org/
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