Printexc.uncaught_exception_handler ceases to be an option ref and becomes
a ref to the handler function initialized to
Printexc.default_uncaught_exception_handler.
The previous mechanism worked for C calls that raise an exception, but not for C calls that call back into OCaml code which raises an exception.
This commit addresses the issue by saving the PC in the interpreter stack before a C call, so that the backtrace mechanism always sees it.
However, if an external is declared in the .ml file and exposed in the .mli file as a val, then ocamlc generates a wrapper that adds a spurious entry in the stack frame. In this PR, this change in behavior results in the re-declaration of Printexc.get_callstack as an external instead of a val, so that the spurious stack frame does not appear in call stacks obtained from Printexc.get_callstack.
fixes#7156
Two new functions exposed:
```ocaml
val to_string_default: exn -> string
(** [Printexc.to_string_default e] returns a string representation of the
exception [e], ignoring all registered exception printers.
@since 4.09
*)
val use_printers: exn -> string option
(** [Printexc.use_printers e] returns [None] if there are no registered
printers and [Some s] with else as the resulting string otherwise.
@since 4.09
*)
```
* Add an Extension_constructor submodule to Obj.
Deprecate top-level functions extension_constructor / extension_name /
extension_id.
* Add 'true' and 'false' to the definition of Bool.t
* Add aliases for the built-in 'list' and 'array' types.
* Add an alias for 'exn' to Printexc.
* Changes entry: built-in type aliases
* Add a Unit module.
* Add paths for built-in exceptions.
- inline Pervasives in Stdlib and re-add Pervasives as a deprecated
module that aliases all elements of Stdlib except the stdlib modules.
- remove special case for Stdlib.Pervasives in printtyp.ml
Add missing @since annotations for OCaml versions 4.00.0 - 4.05.0,
and fix existing annotations as needed:
Format.ikprintf: clarify ambiguity on @since 4.0 annotation
See b81519668f
Hashtbl.is_randomized and ListLabels.sort_uniq should be @since 4.03
List.sort_uniq is 4.02 but ListLabels.sort_uniq is 4.03
See:
512d128918189d29bfcf
This reverts commit 5adf895aac, reversing
changes made to 38c3db40c7.
The reason for the revert is a continuous integration failure on 32bit
arm machines. I don't have the time (or capabilities) to investigate
it right now, and we need functional continuous testing for other
upcoming merges, so the safest choice is to revert -- and hopefully
merge back after the issue is fixed.
In fact currently even if you use `print_backtrace`,
`get_backtrace` or `get_raw_backtrace` just at the start of an
exception handler the backtrace can be wrong if an exception
have been raised and catched in a `when` clause.
It reraises an exception just after copying the given backtrace to the
backtrace buffer. The C primitive `caml_restore_raw_backtrace` only does
the copying part, the compiler adds the reraise.
make_float was added in 4.02
Buffer.(to_bytes, add_bytes, add_subbytes) were added in 4.02.
BytesLabels was added in 4.02.
Digest.(bytes, subbytes) were added in 4.02.
Marshal.(to_bytes, from_bytes) were added in 4.02.
various Pervasives functions were added in 4.02: print_bytes prerr_bytes output_bytes output_substring really_input_string
Printexc.(backtrace_slots, raw_backtrace_slot) were added in 4.02.
Scanf.(ksscanf, kfscanf) were added in 4.02.
Stream.of_bytes was added in 4.02.
From: Jeremy Yallop <yallop@gmail.com>
git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15687 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
- The internal [backtrace_slot] type is not exposed anymore, instead
accessors function return orthogonal information
(is_raise, location). This is both more extensible and more
user-friendly.
- The [raw_backtrace_slot] is exposed separately as a low-level type
that most users should never use. The unsafety of marshalling is
documented. Instead of defining
[raw_backtrace = raw_backtrace_slot array], I kept [raw_backtrace]
an abstract type with [length] and [get] functions for
random-access. This should allow us to change the implementation in
the future to be more robust wrt. marshalling (boxing the trace in
a Custom block, or even possibly the raw slots at access time).
git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14784 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
(Patch by Jacques-Henri Jourdan)
There are several changes:
- `raw_backtrace` is no longer an abstract type, but rather an
`raw_backtrace_slot array`, where `raw_backtrace_slot` is a new
abstract type. `raw_backtrace_slot` elements are hashable and
comparable. At runtime, values of this type contain either
a bytecode pointer or a frame_descr pointer. In order to prevent the
GC from walking through this pointer, the low-order bit is set to
1 when stored in the array.
- The old `loc_info` type is know public, renamed into `backtrace_slot`:
type backtrace_slot =
| Known_location of bool (* is_raise *)
* string (* filename *)
* int (* line number *)
* int (* start char *)
* int (* end char *)
| Unknown_location of bool (*is_raise*)
- new primitive :
val convert_raw_backtrace_slot: raw_backtrace_slot -> backtrace_slot
Rather than returning an option, it raises Failure when it is not
possible to get the debugging information. It seems more idiomatic,
especially because the exceptional case cannot appear only for a part
of the executable.
- the caml_convert_raw_backtrace primitive is removed; it is more
difficult to implement in the C side because of the new exception
interface described above.
- In the bytecode runtime, the events are no longer deserialized once
for each conversion, but once and for all at the first conversion,
and stored in a global array (*outside* the OCaml heap), sorted by
program counter value. I believe this information should not take
much memory in practice (it uses the same order of magnitude memory
as the bytecode executable). It also makes location lookup much more
efficient, as a dichomoty is used instead of linear search as
previously.
git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14776 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Stephen Dolan
Raphael Sousa Santos
Jacques-Henri Jourdan
Andrew Litteken
yallop
Jérémie Dimino
octachron
Max Mouratov
Török Edwin
François Bobot
Frédéric Bour
Damien Doligez
Gabriel Scherer
Damien Doligez
Alain Frisch
Xavier Clerc
Xavier Leroy
Maxence Guesdon