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pennae 6b0620f387 use byte indexed locations for PosIdx 
we now keep not a table of all positions, but a table of all origins and
their sizes. position indices are now direct pointers into the virtual
concatenation of all parsed contents. this slightly reduces memory usage
and time spent in the parser, at the cost of not being able to report
positions if the total input size exceeds 4GiB. this limit is not unique
to nix though, rustc and clang also limit their input to 4GiB (although
at least clang refuses to process inputs that are larger, we will not).

this new 4GiB limit probably will not cause any problems for quite a
while, all of nixpkgs together is less than 100MiB in size and already
needs over 700MiB of memory and multiple seconds just to parse. 4GiB
worth of input will easily take multiple minutes and over 30GiB of
memory without even evaluating anything. if problems *do* arise we can
probably recover the old table-based system by adding some tracking to
Pos::Origin (or increasing the size of PosIdx outright), but for time
being this looks like more complexity than it's worth.

since we now need to read the entire input again to determine the
line/column of a position we'll make unsafeGetAttrPos slightly lazy:
mostly the set it returns is only used to determine the file of origin
of an attribute, not its exact location. the thunks do not add
measurable runtime overhead.

notably this change is necessary to allow changing the parser since
apparently nothing supports nix's very idiosyncratic line ending choice
of "anything goes", making it very hard to calculate line/column
positions in the parser (while byte offsets are very easy).

(cherry picked from commit 5d9fdab3de0ee17c71369ad05806b9ea06dfceda)
Change-Id: Ie0b2430cb120c09097afa8c0101884d94f4bbf34
2024-03-15 19:28:25 +01:00
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ca Merge pull request #9589 from obsidiansystems/floating-content-addressing-derivations-eval-store 2024-03-04 07:15:08 +01:00
common Merge pull request #9632 from cole-h/nix-daemon-testing 2024-03-04 08:17:32 +01:00
config Put functional tests in tests/functional 2023-12-01 12:06:43 -05:00
dyn-drv Merge pull request #9753 from 9999years/print-value-on-type-error 2024-03-09 00:05:41 -07:00
flakes Merge pull request #9324 from 9999years/fix-8854-take-2 2024-03-07 14:50:43 +01:00
lang use byte indexed locations for PosIdx 2024-03-15 19:28:25 +01:00
nested-sandboxing Put functional tests in tests/functional 2023-12-01 12:06:43 -05:00
plugins Put functional tests in tests/functional 2023-12-01 12:06:43 -05:00
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lang-test-infra.sh Put functional tests in tests/functional 2023-12-01 12:06:43 -05:00
lang.sh Fix boost::bad_format_string exception in builtins.addErrorContext (#9291) 2024-03-04 05:39:12 +01:00
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