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Remove unnecessary Obj.magic.#81

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Remove unnecessary Obj.magic.#81
hnrgrgr wants to merge 60 commits into4.02from
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@hnrgrgr hnrgrgr commented Jul 10, 2014

Two distinct calls to 'input_value' are probably less error prone than 6 call to 'Obj.magic'.

Damien Doligez and others added 30 commits May 12, 2014 19:04
This should make the type-checking of formats simpler and more robust:
instead of trying to find a pair as previously, we can now use the
path of the format6 type directly.

A nice side-effect of the change is that the internal definition of
formats (as a pair) is not printed in error messages anymore.
Because format6 is in fact defined in the CamlinternalFormatBasics
submodule of Pervasives, and has an alias at the toplevel of
Pervasives, error messages still expand the definition:

> Error: This expression has type
>          ('a, 'b, 'c, 'd, 'd, 'a) format6 =
>            ('a, 'b, 'c, 'd, 'd, 'a) CamlinternalFormatBasics.format6
>        but an expression was expected of type ...

Passing the option `-short-paths` does avoid this expansion and
returns exactly the same error message as 4.01:

> Error: This expression has type ('a, 'b, 'c, 'd, 'd, 'a) format6
>        but an expression was expected of type ...

(To get this error message without -short-paths, one would need to
define format6 directly in Pervasives; but this type is mutually
recursive with several GADT types that we don't want to add in the
Pervasives namespace unqualified. This is why I'll keep the alias
for now.)

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…ccessing

  the x87 FP stack, which must not be eliminated.
CSEgen: harden against the same x87-specific issue + against reuse of
  values in fixed hardware registers that were destroyed by a prior
  operation.


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See the long comment in pervasives.ml for an explanation of the
change. The short summary is that we need to prove more elaborate
properties between the format types involved in the typing of %(...%),
and that proving things by writing GADT functions in OCaml reveals
that Coq's Ltac is a miracle of usability.

Proofs on OCaml GADTs are runtime functions that do have a runtime
semantics: it is legitimate to hope that those proof computations are
as simple as possible, but the current implementation was optimized
for feasability, not simplicity. François Bobot has some interesting
suggestions to simplify the reasoning part (with more equality
reasoning where I used transitivity and symmetry of the
relation profusely), which may make the code simpler in the future
(and possibly more efficient: the hope is that only %(...%) users will
pay a proof-related cost).

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PR#6082: on x86-32, enforce 16-byte stack alignment for compatibility
with recent GCC and Clang.  Win32/MSVC keeps 4-byte stack alignment.


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gasche and others added 6 commits June 9, 2014 13:53
To be able to compile this patch, you should temporarily apply the
following patch to bootstrap the format type change:

> diff -Naur old/typing/typecore.ml new/typing/typecore.ml
> --- old/typing/typecore.ml	2014-06-06 03:37:03.240926150 +0200
> +++ new/typing/typecore.ml	2014-06-06 03:37:24.696926699 +0200
> @@ -2956,7 +2956,7 @@
>          | Theta rest ->
>            mk_constr "Theta" [ mk_fmt rest ]
>          | Formatting (fmting, rest) ->
> -          mk_constr "Formatting" [ mk_formatting fmting; mk_fmt rest ]
> +          mk_constr "Formatting_lit" [ mk_formatting fmting; mk_fmt rest ]
>          | Reader rest ->
>            mk_constr "Reader" [ mk_fmt rest ]
>          | Scan_char_set (width_opt, char_set, rest) ->

Bootstrap process:

  make core
  apply the patch above
  make core
  make promote-cross
  make partialclean
  revert the patch above, apply the commit
  make partialclean
  make core
  make coreboot

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PR#6211: in toplevel interactive use, bad interaction between uncaught
exceptions and multiple bindings of the form "let x = a let y = b;;".


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…t Vaugon)

The bootstrap procedure, as for commit trunk@14973 (see there for
detailed build instructions), requires to first commit a temporary
patch:

> diff -Naur old/typing/typecore.ml new/typing/typecore.ml
> --- old/typing/typecore.ml        2014-06-11 18:16:24.851647309 +0200
> +++ new/typing/typecore.ml        2014-06-11 18:15:50.075646418 +0200
> @@ -2758,16 +2758,9 @@
>        let mk_int n = mk_cst (Const_int n)
>        and mk_string str = mk_cst (Const_string (str, None))
>        and mk_char chr = mk_cst (Const_char chr) in
> -      let mk_block_type bty = match bty with
> -        | Pp_hbox   -> mk_constr "Pp_hbox"   []
> -        | Pp_vbox   -> mk_constr "Pp_vbox"   []
> -        | Pp_hvbox  -> mk_constr "Pp_hvbox"  []
> -        | Pp_hovbox -> mk_constr "Pp_hovbox" []
> -        | Pp_box    -> mk_constr "Pp_box"    []
> -        | Pp_fits   -> mk_constr "Pp_fits"   [] in
>        let rec mk_formatting_lit fmting = match fmting with
> -        | Open_box (org, bty, idt) ->
> -          mk_constr "Open_box" [ mk_string org; mk_block_type bty; mk_int idt ]
> +        | Open_box _ ->
> +          assert false
>          | Close_box ->
>            mk_constr "Close_box" []
>          | Close_tag ->
> @@ -2950,6 +2943,19 @@
>            mk_constr "Alpha" [ mk_fmt rest ]
>          | Theta rest ->
>            mk_constr "Theta" [ mk_fmt rest ]
> +        | Formatting_lit (Open_box (org, _bty, _idt), rest) ->
> +          mk_constr "Formatting_gen" [
> +            mk_constr "Open_box" [
> +              mk_constr "Format" [
> +                mk_constr "String_literal" [
> +                  mk_string "<>";
> +                  mk_constr "End_of_format" [];
> +                ];
> +                mk_string "@[<>";
> +              ]
> +            ];
> +            mk_fmt rest;
> +          ]
>          | Formatting_lit (fmting, rest) ->
>            mk_constr "Formatting_lit" [ mk_formatting_lit fmting; mk_fmt rest ]
>          | Formatting_gen (fmting, rest) ->

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Why is the comparison a <> here?

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Just a typo. Thanks. I shouldn't have tested only with implementation file !

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gasche commented Jul 11, 2014

I think that's a good thing indeed.

gasche and others added 12 commits July 14, 2014 14:44
ocamlbuild lazily traverses directory to build a vision of the
filesystem tree in which the build happens. During that traversals, it
parses any configuration file `_tags` it encouters. PR#6482 was caused
by the fact that the configuration-parsing code used the relative path
of the _tags file, which was correct at the time of traversal, but
stale at the time the lazy thunk was in fact forced (a Sys.chdir had
occured in between).

The first fix is to detect when relative paths become stale, and use
the correct absolute path in that situation.

The reason why this lazy thunk was only forced after a Sys.chdir is
that, at hygiene time, only the subtrees that are selected for hygiene
checking are forced. It is an unexpected behavior that non-hygienic
subtrees could remain unforced for so long (in particular, the
semantics of parsing a configuration file only much later in the build
process is more than unclear); this commit also removes this behavior
by always forcing the whole traversed subtree just before hygiene.

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Typo in destroyed_at_alloc and destroyed_at_c_call, D17 was incorrectly claimed to be preserved.


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PR#6484 and PR#6486: CSE across memory allocations can present the GC with memory roots that are illegal.
Plus: lift the previous restriction that all arithmetic ops and loads have at most one result register, this isn't true for ARM with soft floats.
Plus: code refactoring and more comments.


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Follow-up to commit 15012: keeping checkbound equations is useless when load equations have been forgotten, as all checkbounds involve a load of a block header.  So, simplify things further by emptying the numbering after calls and allocs.


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gasche commented Aug 28, 2014

I would like to merge this patch in trunk, but it doesn't seem to apply cleanly anymore. Could you rebase?

Two distinct calls to 'input_value' are probably less error prone that 6 use of 'Obj.magic'.
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hnrgrgr commented Aug 29, 2014

I will reopen against trunk.

@hnrgrgr hnrgrgr closed this Aug 29, 2014
chambart pushed a commit to chambart/ocaml-1 that referenced this pull request Aug 4, 2021
Import PRs 63, 96 (partially), 116, 284 and 324.
stedolan pushed a commit to stedolan/ocaml that referenced this pull request Oct 5, 2021
Import PRs 63, 96 (partially), 116, 284 and 324.
EmileTrotignon pushed a commit to EmileTrotignon/ocaml that referenced this pull request Jan 12, 2024
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8 participants