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This makes it possible to skip the check when scanning the stack for the
garbage collector.
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1. There is no point in marking plain integers as GC roots.
2. There is no need to restore the stack pointer, as the stack is not
allocated on the OCaml heap (contrarily to coq_env).
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The first field of accumulators points out of the OCaml heap, so using
closures instead of tag-0 objects is better for the GC.
Accumulators are distinguished from closures because their code pointer
necessarily is the "accumulate" address, which points to an ACCUMULATE
instruction.
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We cannot use caml_alloc_small because the macros Setup_for_gc and
Restore_after_gc are still relevant (and critical). This means defining
the CAML_INTERNALS macro, but it is a legit use and actually documented
in the OCaml manual.
This will help with forward compatibility with OCaml compilers, e.g.,
issue #10603. Unfortunately, it also means that we can no longer use #9914
to prevent memory corruption.
The old macro is still used for OCaml versions prior to 4.10, as the
upstream macro might process Ctrl+C when it is called.
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This is a follow up of #11010 ; I've realized that for example in #11123
a large part of the patch is detabification as indeed the files are
mixed in tabs/space style so developers are forced to do the cleanup
each time they work on them.
Command used:
```
for i in `find . -name '*.c' -or -name '*.h'; do expand -i "$i" | sponge "$i"; sed -e's/[[:space:]]*$//' -i.bak "$i"; done
```
Checked empty diff with `git diff --ignore-all-space`
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The Coq VM stack is scanned by the OCaml GC, but it can contain raw pointers
to C-allocated strings standing for VM bytecode. If the the no-naked-pointers
option is set, we perform the check that a stack value lives on the OCaml heap
ourselves.
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We allocate an additional header so that the accumulator is not a naked
pointer. Indeed, it is contained in accumulator blocks which are scanned by
the GC as their tags is 0.
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This prevents the existence of a few naked pointers to C heap from the OCaml
heap. VM bytecode is represented as any block of size at least 1 whose first
field points to a C-allocated string.
This representation is compatible with the Coq VM representation of
(potentially recursive) closures, which are already specifically tailored
in the OCaml GC to be able to contain out-of-heap data.
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The bytecode interpreter ensures that the stack space available at some
points is above a static threshold. However, arbitrary large stack space
can be needed between two check points, leading to segmentation faults
in some cases.
We track the use of stack space at compilation time and add
an instruction to ensure greater stack capacity when required. This is
inspired from OCaml's PR#339 and PR#7168.
Patch written with Benjamin Grégoire.
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Rename some functions, remove dead code related to (previously deprecated, now
removed) option Set Boxed Values.
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Apparently Cysmtable.set_global_boxed is unused,
and removing it allows to get rid of a bunch of C code
concerning "boxed" things (including ACCUMULATECOND
instruction).
Still TODO: Csymtable.set_transparent_const and
Csymtable.set_opaque_const appear to be no-ops.
Should we remove them ?
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@15845 85f007b7-540e-0410-9357-904b9bb8a0f7
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In particular, the unused lib/tlm.ml and lib/gset.ml are removed
In addition, to simplify code, Libobject.record_object returning only the
('a->obj) function, which is enough almost all the time.
Use Libobject.record_object_full if you really need also the (obj->'a).
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@13460 85f007b7-540e-0410-9357-904b9bb8a0f7
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- essai de suppression des dependances debiles. (echec)
- Application des patch debian.
Pour ring et field :
- introduciton de la function de sign et de puissance.
- Correction de certains bug.
- supression de ring_replace ....
Pour exact_no_check :
- ajout de la tactic : vm_cast_no_check (t)
qui remplace "exact_no_check (t<: type of Goal)"
(cette version forcais l'evaluation du cast dans le
pretypage).
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@9427 85f007b7-540e-0410-9357-904b9bb8a0f7
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Part contre ces cas sont detruis dans les "Definition"
(pas dans les "Lemma") je comprends pas ou ils sont enlev'e...
Si une id'ee ...
- Correction d'un bug dans vm_compute plusieurs fois signal'e par Roland.
- Meilleur compilation des coinductifs, on utilise maintenant vraimment
du lazy.
- Enfin un peu plus de doc dans le code de la vm.
Benjamin
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@9058 85f007b7-540e-0410-9357-904b9bb8a0f7
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git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@6338 85f007b7-540e-0410-9357-904b9bb8a0f7
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git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@6295 85f007b7-540e-0410-9357-904b9bb8a0f7
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git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@6245 85f007b7-540e-0410-9357-904b9bb8a0f7
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