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pennae 34e3bd10e3 avoid copies of parser input data 
when given a string yacc will copy the entire input to a newly allocated
location so that it can add a second terminating NUL byte. since the
parser is a very internal thing to EvalState we can ensure that having
two terminating NUL bytes is always possible without copying, and have
the parser itself merely check that the expected NULs are present.

 # before

Benchmark 1: nix search --offline nixpkgs hello
  Time (mean ± σ):     572.4 ms ±   2.3 ms    [User: 563.4 ms, System: 8.6 ms]
  Range (min … max):   566.9 ms … 579.1 ms    50 runs

Benchmark 2: nix eval -f ../nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix
  Time (mean ± σ):     381.7 ms ±   1.0 ms    [User: 348.3 ms, System: 33.1 ms]
  Range (min … max):   380.2 ms … 387.7 ms    50 runs

Benchmark 3: nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
  Time (mean ± σ):      2.936 s ±  0.005 s    [User: 2.715 s, System: 0.221 s]
  Range (min … max):    2.923 s …  2.946 s    50 runs

 # after

Benchmark 1: nix search --offline nixpkgs hello
  Time (mean ± σ):     571.7 ms ±   2.4 ms    [User: 563.3 ms, System: 8.0 ms]
  Range (min … max):   566.7 ms … 579.7 ms    50 runs

Benchmark 2: nix eval -f ../nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix
  Time (mean ± σ):     376.6 ms ±   1.0 ms    [User: 345.8 ms, System: 30.5 ms]
  Range (min … max):   374.5 ms … 379.1 ms    50 runs

Benchmark 3: nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
  Time (mean ± σ):      2.922 s ±  0.006 s    [User: 2.707 s, System: 0.215 s]
  Range (min … max):    2.906 s …  2.934 s    50 runs
2022-01-13 18:06:15 +01:00
..
realisation Add a nix realisation command for working on realisations 2021-03-09 10:16:44 +01:00
add-file.md Split 'nix store add-to-store' into 'add-path' and 'add-file' 2020-12-04 00:59:24 +01:00
add-path.md Split 'nix store add-to-store' into 'add-path' and 'add-file' 2020-12-04 00:59:24 +01:00
add-to-store.cc Convert option descriptions to Markdown 2021-01-13 14:18:04 +01:00
app.cc run: use pname as a fallback for main program 2021-10-27 14:49:24 -04:00
build.cc std::visit by reference 2021-09-30 21:35:09 +00:00
build.md Fix some typos 2021-03-26 16:14:38 +01:00
bundle.cc nix {bundle,run}: drop broken flake attr-path prefixes 2021-08-21 20:17:05 +02:00
bundle.md Add TODO 2020-12-23 18:26:40 +01:00
cat.cc Add 'nix store' NAR-related manpages 2020-12-21 13:32:28 +01:00
copy.cc run(): Move 2021-09-27 11:12:06 +02:00
copy.md Add 'nix copy' manpage 2020-12-21 13:32:27 +01:00
daemon.cc Don't ignore SIGCHLD in createUnixDomainSocket() 2021-10-05 13:23:16 +02:00
daemon.md Add 'nix daemon' command 2021-01-14 00:05:04 +01:00
describe-stores.cc Remove static variable name clashes 2020-10-06 13:49:20 +02:00
develop.cc Make experimental-features a proper type 2021-10-26 07:02:31 +02:00
develop.md nix develop: add --unpack 2021-10-09 01:19:50 +03:00
diff-closures.cc Use eval-store in more places 2021-07-22 09:59:51 +02:00
diff-closures.md Add 'nix store diff-closures' manpage 2020-12-21 13:32:29 +01:00
doctor.cc Split out local-fs-store.hh 2020-10-09 20:18:08 +00:00
dump-path.cc Add 'nix store' NAR-related manpages 2020-12-21 13:32:28 +01:00
edit.cc Rename findDerivationFilename -> findPackageFilename 2021-07-19 18:10:10 +02:00
edit.md Add 'nix edit' manpage 2020-12-21 13:32:28 +01:00
eval.cc toJSON: report error position for fancier output 2021-10-25 21:17:52 +00:00
eval.md Add 'nix eval' manpage 2020-12-21 13:32:28 +01:00
flake-archive.md Add 'nix flake' manpages 2020-12-23 18:26:40 +01:00
flake-check.md nix flake check: Fix markdown 2021-11-24 13:53:09 +01:00
flake-clone.md Add 'nix flake' manpages 2020-12-23 18:26:40 +01:00
flake-init.md Fix some typos 2021-03-26 16:14:38 +01:00
flake-lock.md nix flake update: Recreate the lock file 2021-02-26 14:55:54 +01:00
flake-metadata.md Merge 'nix flake {info,list-inputs}' into 'nix flake metadata' 2021-03-16 17:19:04 +01:00
flake-new.md Add 'nix flake' manpages 2020-12-23 18:26:40 +01:00
flake-prefetch.md nix store prefetch-tarball -> nix flake prefetch 2021-01-11 12:36:39 +01:00
flake-show.md Ensure nix flake show produces valid json 2021-09-08 19:38:22 -04:00
flake-update.md nix flake update: Recreate the lock file 2021-02-26 14:55:54 +01:00
flake.cc Recognize singular "nixosModule" in nix flake show 2021-11-09 11:14:15 -06:00
flake.md Fix typo 2021-10-02 10:17:45 +03:00
get-env.sh Merge branch 'master' into structured-attrs-shell 2021-07-12 15:49:39 +02:00
hash.cc Remove mkFlag() 2021-01-27 12:06:03 +01:00
help.md Add 'nix help' manpage 2020-12-21 13:32:29 +01:00
key-convert-secret-to-public.md Add commands for generating secret/public keys 2021-01-06 17:49:31 +01:00
key-generate-secret.md Rename 'nix store sign-paths' to 'nix store sign' 2021-01-13 23:32:37 +01:00
local.mk nix --help: Display help using lowdown instead of man 2021-09-13 14:45:21 +02:00
log.cc std::visit by reference 2021-09-30 21:35:09 +00:00
log.md Tweak 2020-12-21 13:32:28 +01:00
ls.cc Remove mkFlag() 2021-01-27 12:06:03 +01:00
main.cc Ignore errors unsharing/restoring the mount namespace 2021-11-16 14:48:44 +01:00
make-content-addressable.cc run(): Move 2021-09-27 11:12:06 +02:00
make-content-addressable.md Add 'nix store make-content-addressable' manpage 2020-12-21 13:32:29 +01:00
nar-cat.md Add 'nix nar' manpages 2020-12-21 13:32:28 +01:00
nar-dump-path.md Add 'nix nar' manpages 2020-12-21 13:32:28 +01:00
nar-ls.md Add 'nix nar' manpages 2020-12-21 13:32:28 +01:00
nar.cc Make '--help' do the same as 'help' (i.e. show a manpage) 2021-01-25 14:38:15 +01:00
nar.md Add 'nix nar' manpages 2020-12-21 13:32:28 +01:00
nix.md Add 'nix' manpage 2020-12-23 18:33:42 +01:00
optimise-store.cc Add 'nix store optimise' manpage 2020-12-21 13:32:28 +01:00
optimise-store.md Add 'nix store optimise' manpage 2020-12-21 13:32:28 +01:00
path-info.cc run(): Move 2021-09-27 11:12:06 +02:00
path-info.md Fix markdown error 2021-09-13 14:44:53 +02:00
ping-store.cc Add 'nix store ping' manpage 2020-12-21 13:32:28 +01:00
ping-store.md Tweak 2021-01-17 19:49:28 +01:00
prefetch.cc Use Bindings::{get,need} instead of find 2021-09-13 13:53:24 +02:00
print-dev-env.md nix print-dev-env: Add --json flag 2021-07-09 12:10:48 +02:00
profile-diff-closures.md Add 'nix profile' manpage 2020-12-21 13:32:29 +01:00
profile-history.md nix profile history: Show profile date 2021-09-14 20:47:33 +02:00
profile-install.md Add 'nix profile' manpage 2020-12-21 13:32:29 +01:00
profile-list.md nix profile info -> nix profile list 2021-01-12 19:57:05 +01:00
profile-remove.md man: fix formatting of nix3-profile-remove 2021-06-28 16:27:03 +02:00
profile-rollback.md Generations -> profile versions 2021-09-14 19:57:45 +02:00
profile-upgrade.md fix doc: nix profile info -> nix profile list 2021-05-24 12:36:08 +02:00
profile-wipe-history.md Add 'nix profile wipe-history' command 2021-09-14 20:35:41 +02:00
profile.cc Refactoring: Add allowPath() method 2021-10-07 12:11:00 +02:00
profile.md Add 'nix profile' manpage 2020-12-21 13:32:29 +01:00
realisation.cc Make experimental-features a proper type 2021-10-26 07:02:31 +02:00
registry-add.md nix registry: add --registry flag 2021-06-30 22:13:32 +03:00
registry-list.md Add 'nix registry' manpages 2020-12-21 13:32:27 +01:00
registry-pin.md Style tweaks 2021-07-07 10:02:55 +02:00
registry-remove.md nix registry: add --registry flag 2021-06-30 22:13:32 +03:00
registry.cc nix registry: Mark experimental 2021-11-12 03:18:31 -05:00
registry.md Fix typo 2021-11-27 23:29:48 +03:00
repl.cc avoid copies of parser input data 2022-01-13 18:06:15 +01:00
repl.md nix repl: add :log 2021-12-06 16:52:50 +03:00
run.cc nix {bundle,run}: drop broken flake attr-path prefixes 2021-08-21 20:17:05 +02:00
run.hh nix develop: Support chroot stores 2021-07-27 14:24:03 +02:00
run.md nix run: Tweak docs 2021-12-13 19:14:32 +01:00
search.cc Disable IFD selectively 2021-09-22 17:15:07 +02:00
search.md Add 'nix search' manpage 2020-12-21 13:32:27 +01:00
shell.md Fix typo in src/nix/shell.md 2021-12-15 23:40:37 -08:00
show-config.cc Forward the whole Nix config to the post-build-hook 2021-07-15 18:41:56 +02:00
show-derivation.cc std::visit by reference 2021-09-30 21:35:09 +00:00
show-derivation.md Add 'nix show-derivation' manpage 2020-12-21 13:32:29 +01:00
sigs.cc nix key: Fix error message and don't require flakes 2021-11-11 21:31:26 -05:00
store-cat.md Add 'nix store' NAR-related manpages 2020-12-21 13:32:28 +01:00
store-delete.cc run(): Move 2021-09-27 11:12:06 +02:00
store-delete.md Add 'nix store delete' command 2021-01-11 19:46:59 +01:00
store-dump-path.md Add 'nix store' NAR-related manpages 2020-12-21 13:32:28 +01:00
store-gc.cc Convert option descriptions to Markdown 2021-01-13 14:18:04 +01:00
store-gc.md Add 'nix store gc' command 2021-01-10 23:29:14 +01:00
store-ls.md Add 'nix store' NAR-related manpages 2020-12-21 13:32:28 +01:00
store-prefetch-file.md Fix some typos 2021-03-26 16:14:38 +01:00
store-repair.cc run(): Move 2021-09-27 11:12:06 +02:00
store-repair.md Add 'nix store repair' command 2021-01-13 23:27:39 +01:00
store.cc Make '--help' do the same as 'help' (i.e. show a manpage) 2021-01-25 14:38:15 +01:00
upgrade-nix.cc Improve error formatting 2021-01-21 11:02:09 +01:00
upgrade-nix.md Add 'nix upgrade-nix' manpage 2020-12-21 13:32:28 +01:00
verify.cc run(): Move 2021-09-27 11:12:06 +02:00
verify.md Add 'nix store verify' manpage 2020-12-21 13:32:28 +01:00
why-depends.cc Use eval-store in more places 2021-07-22 09:59:51 +02:00
why-depends.md Add 'nix why-depends' manpage 2020-12-21 13:32:28 +01:00