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annotate rust/hg-core/src/copy_tracing.rs @ 45972:8b99c473aae2

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copies-rust: move is_ancestor caching within the rust code Now that the OrdMap merging is fast, smaller things start to matters. We move the caching of `is_ancestor` call within the Rust code. This avoid round-trip to Python and help us to shave more time on our slower case: Repo Cases Source-Rev Dest-Rev Old-Time New-Time Difference Factor ------------------------------------------------------------------------------------------------------------------------------------ pypy x0000_revs_x_added_0_copies d1defd0dc478 c9cb1334cc78 : 2.780174 s, 2.137894 s, -0.642280 s, ? 0.7690 mozilla-try x0000_revs_xx000_added_x000_copies 89294cd501d9 7ccb2fc7ccb5 : 9.843481 s, 8.100385 s, -1.743096 s, ? 0.8229 Note: I would happily have used native code for ancestors computation, however I failed (did not tried hard) to created a rust version that goes as fast as the current C version. Below are full tables for: - this change compared to the previous change - this change compared to filelog performance Repo Cases Source-Rev Dest-Rev Old-Time New-Time Difference Factor ------------------------------------------------------------------------------------------------------------------------------------ mercurial x_revs_x_added_0_copies ad6b123de1c7 39cfcef4f463 : 0.000049 s, 0.000047 s, -0.000002 s, ? 0.9592 mercurial x_revs_x_added_x_copies 2b1c78674230 0c1d10351869 : 0.000182 s, 0.000181 s, -0.000001 s, ? 0.9945 mercurial x000_revs_x000_added_x_copies 81f8ff2a9bf2 dd3267698d84 : 0.005872 s, 0.005852 s, -0.000020 s, ? 0.9966 pypy x_revs_x_added_0_copies aed021ee8ae8 099ed31b181b : 0.000229 s, 0.000229 s, +0.000000 s, ? 1.0000 pypy x_revs_x000_added_0_copies 4aa4e1f8e19a 359343b9ac0e : 0.000058 s, 0.000058 s, +0.000000 s, ? 1.0000 pypy x_revs_x_added_x_copies ac52eb7bbbb0 72e022663155 : 0.000148 s, 0.000146 s, -0.000002 s, ? 0.9865 pypy x_revs_x00_added_x_copies c3b14617fbd7 ace7255d9a26 : 0.001205 s, 0.001206 s, +0.000001 s, ? 1.0008 pypy x_revs_x000_added_x000_copies df6f7a526b60 a83dc6a2d56f : 0.025662 s, 0.025275 s, -0.000387 s, ? 0.9849 pypy x000_revs_xx00_added_0_copies 89a76aede314 2f22446ff07e : 0.080113 s, 0.080303 s, +0.000190 s, ? 1.0024 pypy x000_revs_x000_added_x_copies 8a3b5bfd266e 2c68e87c3efe : 0.153030 s, 0.152641 s, -0.000389 s, ? 0.9975 pypy x000_revs_x000_added_x000_copies 89a76aede314 7b3dda341c84 : 0.098774 s, 0.099107 s, +0.000333 s, ? 1.0034 pypy x0000_revs_x_added_0_copies d1defd0dc478 c9cb1334cc78 : 2.780174 s, 2.137894 s, -0.642280 s, ? 0.7690 pypy x0000_revs_xx000_added_0_copies bf2c629d0071 4ffed77c095c : 0.022218 s, 0.022202 s, -0.000016 s, ? 0.9993 pypy x0000_revs_xx000_added_x000_copies 08ea3258278e d9fa043f30c0 : 0.252125 s, 0.228946 s, -0.023179 s, ? 0.9081 netbeans x_revs_x_added_0_copies fb0955ffcbcd a01e9239f9e7 : 0.000186 s, 0.000186 s, +0.000000 s, ? 1.0000 netbeans x_revs_x000_added_0_copies 6f360122949f 20eb231cc7d0 : 0.000133 s, 0.000133 s, +0.000000 s, ? 1.0000 netbeans x_revs_x_added_x_copies 1ada3faf6fb6 5a39d12eecf4 : 0.000320 s, 0.000320 s, +0.000000 s, ? 1.0000 netbeans x_revs_x00_added_x_copies 35be93ba1e2c 9eec5e90c05f : 0.001336 s, 0.001339 s, +0.000003 s, ? 1.0022 netbeans x000_revs_xx00_added_0_copies eac3045b4fdd 51d4ae7f1290 : 0.015573 s, 0.015694 s, +0.000121 s, ? 1.0078 netbeans x000_revs_x000_added_x_copies e2063d266acd 6081d72689dc : 0.018667 s, 0.018457 s, -0.000210 s, ? 0.9888 netbeans x000_revs_x000_added_x000_copies ff453e9fee32 411350406ec2 : 0.112534 s, 0.111691 s, -0.000843 s, ? 0.9925 netbeans x0000_revs_xx000_added_x000_copies 588c2d1ced70 1aad62e59ddd : 1.231869 s, 1.166017 s, -0.065852 s, ? 0.9465 mozilla-central x_revs_x_added_0_copies 3697f962bb7b 7015fcdd43a2 : 0.000197 s, 0.000197 s, +0.000000 s, ? 1.0000 mozilla-central x_revs_x000_added_0_copies dd390860c6c9 40d0c5bed75d : 0.000637 s, 0.000626 s, -0.000011 s, ? 0.9827 mozilla-central x_revs_x_added_x_copies 8d198483ae3b 14207ffc2b2f : 0.000303 s, 0.000303 s, +0.000000 s, ? 1.0000 mozilla-central x_revs_x00_added_x_copies 98cbc58cc6bc 446a150332c3 : 0.001663 s, 0.001679 s, +0.000016 s, ? 1.0096 mozilla-central x_revs_x000_added_x000_copies 3c684b4b8f68 0a5e72d1b479 : 0.007008 s, 0.006947 s, -0.000061 s, ? 0.9913 mozilla-central x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 0.127385 s, 0.133070 s, +0.005685 s, ? 1.0446 mozilla-central x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 0.008740 s, 0.008705 s, -0.000035 s, ? 0.9960 mozilla-central x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 0.005783 s, 0.005913 s, +0.000130 s, ? 1.0225 mozilla-central x000_revs_x000_added_x000_copies 7c97034feb78 4407bd0c6330 : 0.102184 s, 0.101373 s, -0.000811 s, ? 0.9921 mozilla-central x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 0.046220 s, 0.046526 s, +0.000306 s, ? 1.0066 mozilla-central x0000_revs_xx000_added_x000_copies f78c615a656c 96a38b690156 : 0.315271 s, 0.313954 s, -0.001317 s, ? 0.9958 mozilla-central x00000_revs_x0000_added_x0000_copies 6832ae71433c 4c222a1d9a00 : 3.478747 s, 3.367395 s, -0.111352 s, ? 0.9680 mozilla-central x00000_revs_x00000_added_x000_copies 76caed42cf7c 1daa622bbe42 : 4.766435 s, 4.691820 s, -0.074615 s, ? 0.9843 mozilla-try x_revs_x_added_0_copies aaf6dde0deb8 9790f499805a : 0.001214 s, 0.001199 s, -0.000015 s, ? 0.9876 mozilla-try x_revs_x000_added_0_copies d8d0222927b4 5bb8ce8c7450 : 0.001221 s, 0.001216 s, -0.000005 s, ? 0.9959 mozilla-try x_revs_x_added_x_copies 092fcca11bdb 936255a0384a : 0.000613 s, 0.000613 s, +0.000000 s, ? 1.0000 mozilla-try x_revs_x00_added_x_copies b53d2fadbdb5 017afae788ec : 0.001904 s, 0.001906 s, +0.000002 s, ? 1.0011 mozilla-try x_revs_x000_added_x000_copies 20408ad61ce5 6f0ee96e21ad : 0.093000 s, 0.092766 s, -0.000234 s, ? 0.9975 mozilla-try x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 0.132194 s, 0.136074 s, +0.003880 s, ? 1.0294 mozilla-try x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 0.009069 s, 0.009067 s, -0.000002 s, ? 0.9998 mozilla-try x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 0.006169 s, 0.006243 s, +0.000074 s, ? 1.0120 mozilla-try x000_revs_x000_added_x000_copies 1346fd0130e4 4c65cbdabc1f : 0.115540 s, 0.114463 s, -0.001077 s, ? 0.9907 mozilla-try x0000_revs_x_added_0_copies 63519bfd42ee a36a2a865d92 : 0.435381 s, 0.433683 s, -0.001698 s, ? 0.9961 mozilla-try x0000_revs_x_added_x_copies 9fe69ff0762d bcabf2a78927 : 0.415461 s, 0.411278 s, -0.004183 s, ? 0.9899 mozilla-try x0000_revs_xx000_added_x_copies 156f6e2674f2 4d0f2c178e66 : 0.155946 s, 0.155133 s, -0.000813 s, ? 0.9948 mozilla-try x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 0.048521 s, 0.048933 s, +0.000412 s, ? 1.0085 mozilla-try x0000_revs_xx000_added_x000_copies 89294cd501d9 7ccb2fc7ccb5 : 9.843481 s, 8.100385 s, -1.743096 s, ? 0.8229 mozilla-try x0000_revs_x0000_added_x0000_copies e928c65095ed e951f4ad123a : 1.465128 s, 1.446720 s, -0.018408 s, ? 0.9874 mozilla-try x00000_revs_x00000_added_0_copies dc8a3ca7010e d16fde900c9c : 1.374283 s, 1.369537 s, -0.004746 s, ? 0.9965 mozilla-try x00000_revs_x0000_added_x0000_copies 8d3fafa80d4b eb884023b810 : 5.255158 s, 5.186079 s, -0.069079 s, ? 0.9869 Repo Case Source-Rev Dest-Rev filelog sidedata Difference Factor -------------------------------------------------------------------------------------------------------------------------------------- mercurial x_revs_x_added_0_copies ad6b123de1c7 39cfcef4f463 : 0.000892 s, 0.000047 s, -0.000845 s, ? 0.052691 mercurial x_revs_x_added_x_copies 2b1c78674230 0c1d10351869 : 0.001823 s, 0.000181 s, -0.001642 s, ? 0.099287 mercurial x000_revs_x000_added_x_copies 81f8ff2a9bf2 dd3267698d84 : 0.018063 s, 0.005852 s, -0.012211 s, ? 0.323977 pypy x_revs_x_added_0_copies aed021ee8ae8 099ed31b181b : 0.001505 s, 0.000229 s, -0.001276 s, ? 0.152159 pypy x_revs_x000_added_0_copies 4aa4e1f8e19a 359343b9ac0e : 0.205895 s, 0.000058 s, -0.205837 s, ? 0.000282 pypy x_revs_x_added_x_copies ac52eb7bbbb0 72e022663155 : 0.017021 s, 0.000146 s, -0.016875 s, ? 0.008578 pypy x_revs_x00_added_x_copies c3b14617fbd7 ace7255d9a26 : 0.019422 s, 0.001206 s, -0.018216 s, ? 0.062095 pypy x_revs_x000_added_x000_copies df6f7a526b60 a83dc6a2d56f : 0.767740 s, 0.025275 s, -0.742465 s, ? 0.032921 pypy x000_revs_xx00_added_0_copies 89a76aede314 2f22446ff07e : 1.188515 s, 0.080303 s, -1.108212 s, ? 0.067566 pypy x000_revs_x000_added_x_copies 8a3b5bfd266e 2c68e87c3efe : 1.251968 s, 0.152641 s, -1.099327 s, ? 0.121921 pypy x000_revs_x000_added_x000_copies 89a76aede314 7b3dda341c84 : 1.616799 s, 0.099107 s, -1.517692 s, ? 0.061298 pypy x0000_revs_x_added_0_copies d1defd0dc478 c9cb1334cc78 : 0.001057 s, 2.137894 s, +2.136837 s, ? 2022.605487 pypy x0000_revs_xx000_added_0_copies bf2c629d0071 4ffed77c095c : 1.069485 s, 0.022202 s, -1.047283 s, ? 0.020760 pypy x0000_revs_xx000_added_x000_copies 08ea3258278e d9fa043f30c0 : 1.350162 s, 0.228946 s, -1.121216 s, ? 0.169569 netbeans x_revs_x_added_0_copies fb0955ffcbcd a01e9239f9e7 : 0.028008 s, 0.000186 s, -0.027822 s, ? 0.006641 netbeans x_revs_x000_added_0_copies 6f360122949f 20eb231cc7d0 : 0.132281 s, 0.000133 s, -0.132148 s, ? 0.001005 netbeans x_revs_x_added_x_copies 1ada3faf6fb6 5a39d12eecf4 : 0.025311 s, 0.000320 s, -0.024991 s, ? 0.012643 netbeans x_revs_x00_added_x_copies 35be93ba1e2c 9eec5e90c05f : 0.052957 s, 0.001339 s, -0.051618 s, ? 0.025285 netbeans x000_revs_xx00_added_0_copies eac3045b4fdd 51d4ae7f1290 : 0.038011 s, 0.015694 s, -0.022317 s, ? 0.412880 netbeans x000_revs_x000_added_x_copies e2063d266acd 6081d72689dc : 0.198639 s, 0.018457 s, -0.180182 s, ? 0.092917 netbeans x000_revs_x000_added_x000_copies ff453e9fee32 411350406ec2 : 0.955713 s, 0.111691 s, -0.844022 s, ? 0.116867 netbeans x0000_revs_xx000_added_x000_copies 588c2d1ced70 1aad62e59ddd : 3.838886 s, 1.166017 s, -2.672869 s, ? 0.303738 mozilla-central x_revs_x_added_0_copies 3697f962bb7b 7015fcdd43a2 : 0.024548 s, 0.000197 s, -0.024351 s, ? 0.008025 mozilla-central x_revs_x000_added_0_copies dd390860c6c9 40d0c5bed75d : 0.143394 s, 0.000626 s, -0.142768 s, ? 0.004366 mozilla-central x_revs_x_added_x_copies 8d198483ae3b 14207ffc2b2f : 0.026046 s, 0.000303 s, -0.025743 s, ? 0.011633 mozilla-central x_revs_x00_added_x_copies 98cbc58cc6bc 446a150332c3 : 0.085440 s, 0.001679 s, -0.083761 s, ? 0.019651 mozilla-central x_revs_x000_added_x000_copies 3c684b4b8f68 0a5e72d1b479 : 0.195656 s, 0.006947 s, -0.188709 s, ? 0.035506 mozilla-central x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 2.190874 s, 0.133070 s, -2.057804 s, ? 0.060738 mozilla-central x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 0.090208 s, 0.008705 s, -0.081503 s, ? 0.096499 mozilla-central x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 0.747367 s, 0.005913 s, -0.741454 s, ? 0.007912 mozilla-central x000_revs_x000_added_x000_copies 7c97034feb78 4407bd0c6330 : 1.152863 s, 0.101373 s, -1.051490 s, ? 0.087932 mozilla-central x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 6.598336 s, 0.046526 s, -6.551810 s, ? 0.007051 mozilla-central x0000_revs_xx000_added_x000_copies f78c615a656c 96a38b690156 : 3.255015 s, 0.313954 s, -2.941061 s, ? 0.096452 mozilla-central x00000_revs_x0000_added_x0000_copies 6832ae71433c 4c222a1d9a00 : 15.668041 s, 3.367395 s, -12.300646 s, ? 0.214921 mozilla-central x00000_revs_x00000_added_x000_copies 76caed42cf7c 1daa622bbe42 : 20.439638 s, 4.691820 s, -15.747818 s, ? 0.229545 mozilla-try x_revs_x_added_0_copies aaf6dde0deb8 9790f499805a : 0.080923 s, 0.001199 s, -0.079724 s, ? 0.014817 mozilla-try x_revs_x000_added_0_copies d8d0222927b4 5bb8ce8c7450 : 0.498456 s, 0.001216 s, -0.497240 s, ? 0.002440 mozilla-try x_revs_x_added_x_copies 092fcca11bdb 936255a0384a : 0.020798 s, 0.000613 s, -0.020185 s, ? 0.029474 mozilla-try x_revs_x00_added_x_copies b53d2fadbdb5 017afae788ec : 0.226930 s, 0.001906 s, -0.225024 s, ? 0.008399 mozilla-try x_revs_x000_added_x000_copies 20408ad61ce5 6f0ee96e21ad : 1.113005 s, 0.092766 s, -1.020239 s, ? 0.083347 mozilla-try x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 2.230671 s, 0.136074 s, -2.094597 s, ? 0.061001 mozilla-try x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 0.089672 s, 0.009067 s, -0.080605 s, ? 0.101113 mozilla-try x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 0.740221 s, 0.006243 s, -0.733978 s, ? 0.008434 mozilla-try x000_revs_x000_added_x000_copies 1346fd0130e4 4c65cbdabc1f : 1.185881 s, 0.114463 s, -1.071418 s, ? 0.096521 mozilla-try x0000_revs_x_added_0_copies 63519bfd42ee a36a2a865d92 : 0.086072 s, 0.433683 s, +0.347611 s, ? 5.038607 mozilla-try x0000_revs_x_added_x_copies 9fe69ff0762d bcabf2a78927 : 0.081321 s, 0.411278 s, +0.329957 s, ? 5.057464 mozilla-try x0000_revs_xx000_added_x_copies 156f6e2674f2 4d0f2c178e66 : 7.528370 s, 0.155133 s, -7.373237 s, ? 0.020606 mozilla-try x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 6.757368 s, 0.048933 s, -6.708435 s, ? 0.007241 mozilla-try x0000_revs_xx000_added_x000_copies 89294cd501d9 7ccb2fc7ccb5 : 7.643752 s, 8.100385 s, +0.456633 s, ? 1.059739 mozilla-try x0000_revs_x0000_added_x0000_copies e928c65095ed e951f4ad123a : 9.704242 s, 1.446720 s, -8.257522 s, ? 0.149081 mozilla-try x00000_revs_x_added_0_copies 6a320851d377 1ebb79acd503 : 0.092845 s, killed mozilla-try x00000_revs_x00000_added_0_copies dc8a3ca7010e d16fde900c9c : 26.626870 s, 1.369537 s, -25.257333 s, ? 0.051434 mozilla-try x00000_revs_x_added_x_copies 5173c4b6f97c 95d83ee7242d : 0.092953 s, killed mozilla-try x00000_revs_x000_added_x_copies 9126823d0e9c ca82787bb23c : 0.227131 s, killed mozilla-try x00000_revs_x0000_added_x0000_copies 8d3fafa80d4b eb884023b810 : 18.884666 s, 5.186079 s, -13.698587 s, ? 0.274619 mozilla-try x00000_revs_x00000_added_x0000_copies 1b661134e2ca 1ae03d022d6d : 21.451622 s, killed mozilla-try x00000_revs_x00000_added_x000_copies 9b2a99adc05e 8e29777b48e6 : 25.152558 s, killed Differential Revision: https://phab.mercurial-scm.org/D9303
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Fri, 02 Oct 2020 15:41:31 +0200
parents cc759d3db1e8
children ed0e1339e4a8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 use crate::utils::hg_path::HgPathBuf;
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2 use crate::Revision;
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4 use im_rc::ordmap::DiffItem;
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5 use im_rc::ordmap::OrdMap;
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7 use std::collections::HashMap;
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8 use std::collections::HashSet;
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9
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10 pub type PathCopies = HashMap<HgPathBuf, HgPathBuf>;
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12 #[derive(Clone, Debug, PartialEq)]
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13 struct TimeStampedPathCopy {
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14 /// revision at which the copy information was added
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15 rev: Revision,
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16 /// the copy source, (Set to None in case of deletion of the associated
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17 /// key)
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18 path: Option<HgPathBuf>,
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19 }
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20
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21 /// maps CopyDestination to Copy Source (+ a "timestamp" for the operation)
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22 type TimeStampedPathCopies = OrdMap<HgPathBuf, TimeStampedPathCopy>;
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23
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24 /// hold parent 1, parent 2 and relevant files actions.
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25 pub type RevInfo = (Revision, Revision, ChangedFiles);
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26
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27 /// represent the files affected by a changesets
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28 ///
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29 /// This hold a subset of mercurial.metadata.ChangingFiles as we do not need
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30 /// all the data categories tracked by it.
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31 pub struct ChangedFiles {
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32 removed: HashSet<HgPathBuf>,
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33 merged: HashSet<HgPathBuf>,
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34 salvaged: HashSet<HgPathBuf>,
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35 copied_from_p1: PathCopies,
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36 copied_from_p2: PathCopies,
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37 }
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38
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39 impl ChangedFiles {
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40 pub fn new(
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41 removed: HashSet<HgPathBuf>,
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42 merged: HashSet<HgPathBuf>,
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43 salvaged: HashSet<HgPathBuf>,
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44 copied_from_p1: PathCopies,
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45 copied_from_p2: PathCopies,
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46 ) -> Self {
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47 ChangedFiles {
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48 removed,
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49 merged,
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50 salvaged,
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51 copied_from_p1,
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52 copied_from_p2,
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53 }
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54 }
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55
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56 pub fn new_empty() -> Self {
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57 ChangedFiles {
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58 removed: HashSet::new(),
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59 merged: HashSet::new(),
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60 salvaged: HashSet::new(),
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61 copied_from_p1: PathCopies::new(),
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62 copied_from_p2: PathCopies::new(),
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63 }
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64 }
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65 }
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66
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67 /// A struct responsible for answering "is X ancestors of Y" quickly
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68 ///
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69 /// The structure will delegate ancestors call to a callback, and cache the
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70 /// result.
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71 #[derive(Debug)]
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72 struct AncestorOracle<'a, A: Fn(Revision, Revision) -> bool> {
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73 inner: &'a A,
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74 pairs: HashMap<(Revision, Revision), bool>,
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75 }
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76
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77 impl<'a, A: Fn(Revision, Revision) -> bool> AncestorOracle<'a, A> {
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78 fn new(func: &'a A) -> Self {
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79 Self {
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80 inner: func,
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81 pairs: HashMap::default(),
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82 }
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83 }
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84
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85 /// returns `true` if `anc` is an ancestors of `desc`, `false` otherwise
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86 fn is_ancestor(&mut self, anc: Revision, desc: Revision) -> bool {
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87 if anc > desc {
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88 false
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89 } else if anc == desc {
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90 true
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91 } else {
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92 if let Some(b) = self.pairs.get(&(anc, desc)) {
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93 *b
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94 } else {
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95 let b = (self.inner)(anc, desc);
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96 self.pairs.insert((anc, desc), b);
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97 b
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98 }
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99 }
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100 }
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101 }
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102
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103 /// Same as mercurial.copies._combine_changeset_copies, but in Rust.
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104 ///
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105 /// Arguments are:
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106 ///
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107 /// revs: all revisions to be considered
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108 /// children: a {parent ? [childrens]} mapping
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109 /// target_rev: the final revision we are combining copies to
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110 /// rev_info(rev): callback to get revision information:
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111 /// * first parent
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112 /// * second parent
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113 /// * ChangedFiles
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114 /// isancestors(low_rev, high_rev): callback to check if a revision is an
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115 /// ancestor of another
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116 pub fn combine_changeset_copies<A: Fn(Revision, Revision) -> bool>(
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117 revs: Vec<Revision>,
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118 children: HashMap<Revision, Vec<Revision>>,
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119 target_rev: Revision,
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120 rev_info: &impl Fn(Revision) -> RevInfo,
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121 is_ancestor: &A,
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122 ) -> PathCopies {
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123 let mut all_copies = HashMap::new();
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124 let mut oracle = AncestorOracle::new(is_ancestor);
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125
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126 for rev in revs {
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127 // Retrieve data computed in a previous iteration
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128 let copies = all_copies.remove(&rev);
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129 let copies = match copies {
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130 Some(c) => c,
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131 None => TimeStampedPathCopies::default(), // root of the walked set
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132 };
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133
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134 let current_children = match children.get(&rev) {
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135 Some(c) => c,
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136 None => panic!("inconsistent `revs` and `children`"),
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137 };
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138
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139 for child in current_children {
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140 // We will chain the copies information accumulated for `rev` with
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141 // the individual copies information for each of its children.
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142 // Creating a new PathCopies for each `rev` ? `children` vertex.
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143 let (p1, p2, changes) = rev_info(*child);
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144
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145 let (parent, child_copies) = if rev == p1 {
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146 (1, &changes.copied_from_p1)
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147 } else {
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148 assert_eq!(rev, p2);
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149 (2, &changes.copied_from_p2)
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150 };
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151 let mut new_copies = copies.clone();
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152
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153 for (dest, source) in child_copies {
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154 let entry;
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155 if let Some(v) = copies.get(source) {
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156 entry = match &v.path {
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157 Some(path) => Some((*(path)).to_owned()),
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158 None => Some(source.to_owned()),
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159 }
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160 } else {
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161 entry = Some(source.to_owned());
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162 }
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163 // Each new entry is introduced by the children, we record this
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164 // information as we will need it to take the right decision
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165 // when merging conflicting copy information. See
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166 // merge_copies_dict for details.
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167 let ttpc = TimeStampedPathCopy {
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168 rev: *child,
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169 path: entry,
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170 };
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171 new_copies.insert(dest.to_owned(), ttpc);
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172 }
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173
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174 // We must drop copy information for removed file.
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175 //
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176 // We need to explicitly record them as dropped to propagate this
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177 // information when merging two TimeStampedPathCopies object.
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178 for f in changes.removed.iter() {
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179 if new_copies.contains_key(f.as_ref()) {
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180 let ttpc = TimeStampedPathCopy {
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181 rev: *child,
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182 path: None,
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183 };
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184 new_copies.insert(f.to_owned(), ttpc);
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185 }
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186 }
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187
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188 // Merge has two parents needs to combines their copy information.
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189 //
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190 // If the vertex from the other parent was already processed, we
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191 // will have a value for the child ready to be used. We need to
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192 // grab it and combine it with the one we already
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193 // computed. If not we can simply store the newly
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194 // computed data. The processing happening at
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195 // the time of the second parent will take care of combining the
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196 // two TimeStampedPathCopies instance.
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197 match all_copies.remove(child) {
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198 None => {
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199 all_copies.insert(child, new_copies);
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200 }
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201 Some(other_copies) => {
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202 let (minor, major) = match parent {
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203 1 => (other_copies, new_copies),
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204 2 => (new_copies, other_copies),
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205 _ => unreachable!(),
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206 };
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207 let merged_copies =
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208 merge_copies_dict(minor, major, &changes, &mut oracle);
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209 all_copies.insert(child, merged_copies);
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210 }
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211 };
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212 }
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213 }
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214
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215 // Drop internal information (like the timestamp) and return the final
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216 // mapping.
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217 let tt_result = all_copies
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218 .remove(&target_rev)
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219 .expect("target revision was not processed");
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220 let mut result = PathCopies::default();
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221 for (dest, tt_source) in tt_result {
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222 if let Some(path) = tt_source.path {
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223 result.insert(dest, path);
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224 }
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225 }
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226 result
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227 }
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228
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229 /// merge two copies-mapping together, minor and major
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230 ///
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231 /// In case of conflict, value from "major" will be picked, unless in some
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232 /// cases. See inline documentation for details.
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233 #[allow(clippy::if_same_then_else)]
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234 fn merge_copies_dict<A: Fn(Revision, Revision) -> bool>(
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235 minor: TimeStampedPathCopies,
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236 major: TimeStampedPathCopies,
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237 changes: &ChangedFiles,
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238 oracle: &mut AncestorOracle<A>,
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239 ) -> TimeStampedPathCopies {
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240 if minor.is_empty() {
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241 return major;
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242 } else if major.is_empty() {
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243 return minor;
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244 }
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245 let mut override_minor = Vec::new();
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246 let mut override_major = Vec::new();
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247
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248 let mut to_major = |k: &HgPathBuf, v: &TimeStampedPathCopy| {
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249 override_major.push((k.clone(), v.clone()))
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250 };
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251 let mut to_minor = |k: &HgPathBuf, v: &TimeStampedPathCopy| {
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252 override_minor.push((k.clone(), v.clone()))
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253 };
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254
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255 // The diff function leverage detection of the identical subpart if minor
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256 // and major has some common ancestors. This make it very fast is most
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257 // case.
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258 //
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259 // In case where the two map are vastly different in size, the current
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260 // approach is still slowish because the iteration will iterate over
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261 // all the "exclusive" content of the larger on. This situation can be
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262 // frequent when the subgraph of revision we are processing has a lot
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263 // of roots. Each roots adding they own fully new map to the mix (and
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264 // likely a small map, if the path from the root to the "main path" is
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265 // small.
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266 //
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267 // We could do better by detecting such situation and processing them
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268 // differently.
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269 for d in minor.diff(&major) {
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270 match d {
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271 DiffItem::Add(k, v) => to_minor(k, v),
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272 DiffItem::Remove(k, v) => to_major(k, v),
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273 DiffItem::Update { old, new } => {
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274 let (dest, src_major) = new;
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275 let (_, src_minor) = old;
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276 let mut pick_minor = || (to_major(dest, src_minor));
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277 let mut pick_major = || (to_minor(dest, src_major));
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278 if src_major.path == src_minor.path {
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279 // we have the same value, but from other source;
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280 if src_major.rev == src_minor.rev {
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281 // If the two entry are identical, no need to do
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282 // anything (but diff should not have yield them)
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283 unreachable!();
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284 } else if oracle.is_ancestor(src_major.rev, src_minor.rev)
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285 {
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286 pick_minor();
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287 } else {
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288 pick_major();
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289 }
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290 } else if src_major.rev == src_minor.rev {
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291 // We cannot get copy information for both p1 and p2 in the
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292 // same rev. So this is the same value.
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293 unreachable!();
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294 } else if src_major.path.is_none()
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295 && changes.salvaged.contains(dest)
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296 {
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297 // If the file is "deleted" in the major side but was
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298 // salvaged by the merge, we keep the minor side alive
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299 pick_minor();
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300 } else if src_minor.path.is_none()
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301 && changes.salvaged.contains(dest)
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302 {
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303 // If the file is "deleted" in the minor side but was
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304 // salvaged by the merge, unconditionnaly preserve the
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305 // major side.
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306 pick_major();
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307 } else if changes.merged.contains(dest) {
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308 // If the file was actively merged, copy information from
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309 // each side might conflict. The major side will win such
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310 // conflict.
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311 pick_major();
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312 } else if oracle.is_ancestor(src_major.rev, src_minor.rev) {
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313 // If the minor side is strictly newer than the major side,
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314 // it should be kept.
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315 pick_minor();
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316 } else if src_major.path.is_some() {
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317 // without any special case, the "major" value win other
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318 // the "minor" one.
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319 pick_major();
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320 } else if oracle.is_ancestor(src_minor.rev, src_major.rev) {
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321 // the "major" rev is a direct ancestors of "minor", any
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322 // different value should overwrite
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323 pick_major();
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324 } else {
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325 // major version is None (so the file was deleted on that
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326 // branch) and that branch is independant (neither minor
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327 // nor major is an ancestors of the other one.) We preserve
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328 // the new information about the new file.
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329 pick_minor();
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330 }
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331 }
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332 };
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333 }
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334
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335 let updates;
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336 let mut result;
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337 if override_major.is_empty() {
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338 result = major
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339 } else if override_minor.is_empty() {
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340 result = minor
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341 } else {
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342 if override_minor.len() < override_major.len() {
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343 updates = override_minor;
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344 result = minor;
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345 } else {
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346 updates = override_major;
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347 result = major;
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348 }
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349 for (k, v) in updates {
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350 result.insert(k, v);
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351 }
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352 }
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353 result
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354 }