We need to be careful to not grab an extra reference when mutating data
structures because that means we make extra copies. Doing that every
time in `_modify` is really painful, as that function implements `|=`
and all modify-assign operators.
`jv_setpath()` also grabs additional references, so this is not the only
fix needed for the modify-assign operators to not be accidentally
quadratic.
We have to use `LOADVN` in order to make this fix possible, so we should
really byte-code `_modify` rather than jq-code it. However, as a
stop-gap to make this fix easier, I'm adding syntax for referring to a
`$binding` such that you get `LOADVN` instead of `LOADV`.
This syntax is not meant to be used outside jq's internals! Therefore
it is not documented. I promise to break it later, so don't use it!
TBD, but later:
- Optimize `_modify` for the case where `update` outputs more than one
value.
This is trivial: add a `setpath($p; null)` in the middle of `_modify`
before calling `update`. But unfortunately the VM retains a
reference to `value_at_path` for path expression checking, and fixing
that will require more work.
We need to be careful to not grab an extra reference when mutating
data structures because that means we make extra copies. Doing that
every time in `jv_setpath()` is really painful, as that function is used
in `_modify/2`, which is used in `|=` and all modify-assign operators.
`_modify` also grabs additional references, so this is not the only fix
needed for the modify-assign operators to not be accidentally quadratic.
Keep a cached copy of the man tests that we can use when no manpage
changes are made. This allows automated systems that might not have
easy access to a pipenv to build and run tests.
It has no effect after the change c4524da.
Bug reported by the clang static analyzer.
Description: Value stored to 'value' is never read
File: jq/src/util.c
Line: 439
Test Plan:
To verify that this is in fact the behavior:
```
$ jq --indent 7 -n '[1]'
[
1
]
$ jq --indent 8 -n '[1]'
jq: --indent takes a number between -1 and 7
Use jq --help for help with command-line options,
or see the jq manpage, or online docs at https://stedolan.github.io/jq
```
This patch was generated by running `git grep "no more than"` and fixing
up appropriate results.
wchargin-branch: docs-fix-indent-bounds
Allow building jq in a mode that doesn't use decnumber for benchmarking
purposes. decnumber support is enabled by default, and this option is
meant to be removed once we're happy with the performance.
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.
Owen Ou