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Code Activity
21562 commits 177 branches 218 tags 162 MiB
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20 commits

Author SHA1 Message Date
Robert Hensing
c121c65640 C API: Clarify valid use of bindings ordering 2025-09-21 21:16:46 +02:00
Robert Hensing
3d777eb37f C API: Add lazy attribute value and list item accessors 2025-09-19 23:39:00 +02:00
Robert Hensing
7c553a30a9 C API: Improve nix_get_attr_name_byidx() doc 2025-09-19 23:39:00 +02:00
Sergei Zimmerman
6138bc3de3
libexpr: Structural sharing of attrsets 
This changes the implementation of Bindings to allow
for a more space-efficient implementation of attribute
set merges. This is accomplished by "layering" over the "base" Bindings.
The top "layer" is naturally the right-hand-side of the update operator //.

Such an implementation leads to significantly better memory usage on
something like nixpkgs:

nix-env --query --available --out-path --file ../nixpkgs --eval-system x86_64-linux > /dev/null

Comparison against 2b0fd88324 for x86_64-linux on nixpkgs f06c7c3b6f5074dbffcf02542fb86af3a5526afa:

| metric                 | mean_before     | mean_after      | mean_diff       | mean_%_change | p_value | t_stat  |
| -                      | -               | -               | -               | -             | -       | -       |
| cpuTime                | 21.1520         | 21.3414         | 0.1894          | 0.7784        | 0.3190  | 1.0219  |
| envs.bytes             | 461451951.6190  | 461451951.6190  | -               | -             | -       | -       |
| envs.elements          | 34344544.8571   | 34344544.8571   | -               | -             | -       | -       |
| envs.number            | 23336949.0952   | 23336949.0952   | -               | -             | -       | -       |
| gc.cycles              | 7.5238          | 7.2857          | -0.2381         | -4.6825       | 0.0565  | -2.0244 |
| gc.heapSize            | 1777848124.9524 | 1252162023.6190 | -525686101.3333 | -29.9472      | 0.0000  | -8.7041 |
| gc.totalBytes          | 3102787383.6190 | 2498431578.6667 | -604355804.9524 | -19.7704      | 0.0000  | -9.3502 |
| list.bytes             | 59928225.9048   | 59928225.9048   | -               | -             | -       | -       |
| list.concats           | 1240028.2857    | 1240028.2857    | -               | -             | -       | -       |
| list.elements          | 7491028.2381    | 7491028.2381    | -               | -             | -       | -       |
| nrAvoided              | 28165342.2381   | 28165342.2381   | -               | -             | -       | -       |
| nrExprs                | 1577412.9524    | 1577412.9524    | -               | -             | -       | -       |
| nrFunctionCalls        | 20970743.4286   | 20970743.4286   | -               | -             | -       | -       |
| nrLookups              | 10867306.0952   | 10867306.0952   | -               | -             | -       | -       |
| nrOpUpdateValuesCopied | 61206062.0000   | 25748169.5238   | -35457892.4762  | -58.8145      | 0.0000  | -8.9189 |
| nrOpUpdates            | 2167097.4286    | 2167097.4286    | -               | -             | -       | -       |
| nrPrimOpCalls          | 12337423.4286   | 12337423.4286   | -               | -             | -       | -       |
| nrThunks               | 29361806.7619   | 29361806.7619   | -               | -             | -       | -       |
| sets.bytes             | 1393822818.6667 | 897587655.2381  | -496235163.4286 | -36.7168      | 0.0000  | -9.1115 |
| sets.elements          | 84504465.3333   | 48270845.9524   | -36233619.3810  | -43.8698      | 0.0000  | -8.9181 |
| sets.number            | 5218921.6667    | 5218921.6667    | -               | -             | -       | -       |
| sizes.Attr             | 16.0000         | 16.0000         | -               | -             | -       | -       |
| sizes.Bindings         | 8.0000          | 24.0000         | 16.0000         | 200.0000      | -       | inf     |
| sizes.Env              | 8.0000          | 8.0000          | -               | -             | -       | -       |
| sizes.Value            | 16.0000         | 16.0000         | -               | -             | -       | -       |
| symbols.bytes          | 1368494.0952    | 1368494.0952    | -               | -             | -       | -       |
| symbols.number         | 109147.1905     | 109147.1905     | -               | -             | -       | -       |
| time.cpu               | 21.1520         | 21.3414         | 0.1894          | 0.7784        | 0.3190  | 1.0219  |
| time.gc                | 1.6011          | 0.8508          | -0.7503         | -37.1507      | 0.0017  | -3.6328 |
| time.gcFraction        | 0.0849          | 0.0399          | -0.0450         | -37.4504      | 0.0035  | -3.3116 |
| values.bytes           | 615968144.7619  | 615968144.7619  | -               | -             | -       | -       |
| values.number          | 38498009.0476   | 38498009.0476   | -               | -             | -       | -       |

Overall this does slow down the evaluator slightly (no more than ~10% in most cases),
but this seems like a very decent tradeoff for shaving off 33% of memory usage.
 2025-09-17 23:54:45 +03:00
John Ericson
f3e1c47f47 Separate headers from source files 
The short answer for why we need to do this is so we can consistently do
`#include "nix/..."`. Without this change, there are ways to still make
that work, but they are hacky, and they have downsides such as making it
harder to make sure headers from the wrong Nix library (e..g.
`libnixexpr` headers in `libnixutil`) aren't being used.

The C API alraedy used `nix_api_*`, so its headers are *not* put in
subdirectories accordingly.

Progress on #7876

We resisted doing this for a while because it would be annoying to not
have the header source file pairs close by / easy to change file
path/name from one to the other. But I am ameliorating that with
symlinks in the next commit.
 2025-03-31 12:20:25 -04:00
Robert Hensing
1bd7517801 Doc nix_get_path_string 2024-11-24 23:57:24 +01:00
Eelco Dolstra
02f0294be0 Fix most DoxyGen warnings 
Helps with #11841.
 2024-11-12 15:34:24 +01:00
Robert Hensing
b94e1d6218 C API: Value -> nix_value 
See issue https://github.com/NixOS/nix/issues/10434
 2024-06-13 18:51:58 +02:00
Robert Hensing
c50db4e58c C API: Add nix_value_{inc,dec}ref 
- Can be implemented more easily by more eval architectures.
- Better types in generated bindings remove some uncertainty and doubt.
 2024-06-13 18:21:04 +02:00
Robert Hensing
0b56c98b1c C API: Value -> nix_value 2024-06-13 18:18:36 +02:00
Philipp Zander
25e2b1f7f7 improve note in nix_value_force documentation 2024-06-03 09:55:44 +02:00
Philipp
2bd66922ee
add empty line to documentation comments after @brief field (#10800) 
* add empty line to documentation comments after `@brief` field

Co-authored-by: Cole Helbling <cole.e.helbling@outlook.com>
 2024-05-28 23:05:40 +00:00
José Luis Lafuente
6acf02b32a
C API: source argument to nix_copy_value should be const 2024-04-21 22:46:18 +02:00
Robert Hensing
ad643cde58 C API: Add nix_init_apply 
Thunks are relevant when initializing attrsets and lists, passing
arguments. This is an important way to produce them.
 2024-04-18 19:13:38 +02:00
José Luis Lafuente
c75b143b6c
C API: nix_get_string now accepts a callback to return the value 2024-04-16 22:36:39 +02:00
Robert Hensing
02c41aba5b libexpr-c: Add nix_string_realise 2024-04-05 16:08:18 +02:00
José Luis Lafuente
926fbadcc3
C API: add more tests 2024-03-29 14:00:19 +01:00
José Luis Lafuente
061140fc8f
C API: remove unused argument 2024-03-28 19:38:12 +01:00
José Luis Lafuente
925a8fda6e
C API: Use new ListBuilder helper 
See https://github.com/NixOS/nix/pull/10251
 2024-03-28 19:02:01 +01:00
José Luis Lafuente
c57de60522
C API: Keep the structure flat 
See https://github.com/NixOS/nix/pull/10329
 2024-03-28 19:00:04 +01:00
Renamed from src/libexpr/c/nix_api_value.h (Browse further)