You only need to specify the return type in a function pointer
declaration in C.
If you use () in the declaration, the function pointer can be called
with any arguments, and the type of the arguments is decided for each
function call based on the types of the arguments used for the call.
(To declare a function pointer for a function with no arguments, you use
`(void)'.)
Since all the cfunction structs have a fptr that points to a functions
that return jv, not void, we can we can just declare cfunction.fptr as
jv (*)() and avoid having those annoying and technically not C-standard
compliant casts everywhere.
Close #1885, #2140, #2011, #2220, #2485, #2073
Rename the FORK_OPT opcode to TRY_BEGIN, add a TRY_END opcode, and wrap
errors when raising through a TRY_END so that they will not be caught by
the matching TRY_BEGIN.
Now a `try exp catch handler` expression generates code like:
TRY_BEGIN handler
<exp>
TRY_END
JUMP past_handler
handler: <handler>
past_handler:
...
On backtrack through TRY_BEGIN it just backtracks.
If anything past the whole thing raises when <exp> produced a value,
then the TRY_END will catch the error, wrap it in another, and
backtrack. The TRY_BEGIN will see a wrapped error and then it will
unwrap and re-raise the error.
If <exp> raises, then TRY_BEGIN will catch the error and jump to the
handler, but the TRY_BEGIN will not stack_save() in that case, so on
raise/backtrack the TRY_BEGIN will not execute again (nor will the
TRY_END).
To make debug/0 not call an uninitialised function pointer when using
--run-tests or when using a jq_state on which jq_set_debug_cb() has not
been called.
To avoid causing segmentation faults when input/1 is called in a
jq_state on which jq_set_input_cb() has not been called; e.g. the one
used by jq --run-tests.
That segfault could also be fixed in run_jq_tests() by calling:
jq_set_input_cb(jq, NULL, NULL);
But I think it makes sense to just make jq_init() initialise those
values to NULL.
Ref: https://github.com/jqlang/jq/pull/2717#discussion_r1264338841
Extend jv_number to use decNumber for storing number literals. Any math
operations on the numbers will truncate them to double precision.
Comparisons when both numbers are literal numbers will compare them
without truncation.
Delay conversion of numbers to doubles until a math operation is performed,
to preserve precision. A literal jv_number will only need conversion to
double once, and will reuse the resultant double on subsequent
conversions.
Outputting literal jv_numbers preserves the original precision.
Add strong pthread requirement to manage contexts/allocations for
converting numbers between their decNumber, string, and double formats.
Expressions of the form `path(EXPR) | select(GENERATOR)`, where `EXPR`
is a path expression and `GENERATOR` is a generator conditional
expression (e.g., `has("a"), has("b")`) cause an assertion if the
jq_state VM is torn down too soon. That assert() was only correct if
assuming that the conditional is not a generator.
If the conditional is generator, then what we see is that when
backtracking a SUBEXP_END is executed without a corresponding
SUBEXP_BEGIN because the entire conditional is bracketed with
SUBEXP_BEGIN and SUBEXP_END, and since it's resumed in the middle, in
between the brackets.
Rather than assert that the jq->path_len being restored has some
particular value, we can simply re-compute it from the restored
jq->path.
Attempting to use the existing FORK_OPT opcode resulted in difficulty
knowing when to pop an error message off the stack and when not to. This
commit makes DESTRUCTURE_ALT a real opcode that is identical to
FORK_OPT, except for never pushing the error message onto the stack when
continuing from an error backtrack.
Some small changes were necessary to the DUP/POP behavior surrounding
destructuring to accomodate this.
It needs to be possible to do something like
getpath($paths[]) += 1
meaning: increment all the paths in . that are listed in $paths[].
In order to do this getpath() needs to update the jq->path and
jq->value_at_path as necessary.
