b805c61755
The .build-id directory tree is as described here: https://fedoraproject.org/wiki/RolandMcGrath/BuildID Tools such as llvm-symbolizer understand this tree and can use it to look up symbols by build ID. This CL adds a post-build step that updates the .build-id directory under symbols after every build if necessary to contain symlinks to the corresponding symbols file. I also considered adding this as a build step after copying the symbol file to the symbols directory. However this would be complicated by the fact that many binaries have the same build-id such as the various copies of libc++ for the different APEXes. As a result it would be difficult to implement a .build-id updater that produces a correct symlink tree while taking into account concurrent updates to the same symlink by different build steps. This situation is resolved in the .build-id directory generator by having the symlink point to the lexically smallest path out of all paths with the same build-id. I measured the performance of the UpdateBuildIdDir function by writing a standalone program that just calls the function and running it over a copy of the symbols directory for a specific target. On my machine the execution time of the program when simulating various scenarios was as follows: Null build [1]: 36.2 ms ± 3.4 ms Initial build [2]: 162.3 ms ± 6.6 ms Single update [3]: 128.0 ms ± 6.1 ms Invalid .build-id dir [4]: 222.6 ms ± 8.6 ms This is with some improvements that have been contributed to the Go standard library [5,6]; without those improvements a null build is 37.9 ms ± 4.4 ms and a single update is 143.9 ms ± 4.5 ms. [1] hyperfine './update-build-id ~/2/test-symbols2/' [2] hyperfine -p 'rm -rf ~/2/test-symbols2/.build-id' './update-build-id ~/2/test-symbols2/' [3] hyperfine -p 'dd if=/dev/urandom of=$HOME/2/test-symbols2/system/bin/init conv=notrunc seek=808 bs=1 count=16' './update-build-id ~/2/test-symbols2/' [4] hyperfine -p 'touch ~/2/test-symbols2/.build-id/corrupt; sleep 0.1; touch ~/2/test-symbols2/system/bin/init' './update-build-id ~/2/test-symbols2/' [5] https://go.dev/cl/570877 [6] https://go.dev/cl/571436 Bug: 328702178 Change-Id: I8fc0ea81bd31ec80d6b912ba477e2e24b6b05f68
98 lines
2.3 KiB
Plaintext
98 lines
2.3 KiB
Plaintext
// Copyright 2017 Google Inc. All rights reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package {
|
|
default_applicable_licenses: ["Android-Apache-2.0"],
|
|
}
|
|
|
|
bootstrap_go_package {
|
|
name: "soong-ui-build-paths",
|
|
pkgPath: "android/soong/ui/build/paths",
|
|
srcs: [
|
|
"paths/config.go",
|
|
"paths/logs.go",
|
|
],
|
|
testSrcs: [
|
|
"paths/logs_test.go",
|
|
],
|
|
}
|
|
|
|
bootstrap_go_package {
|
|
name: "soong-ui-build",
|
|
pkgPath: "android/soong/ui/build",
|
|
deps: [
|
|
"blueprint",
|
|
"blueprint-bootstrap",
|
|
"blueprint-microfactory",
|
|
"soong-android",
|
|
"soong-elf",
|
|
"soong-finder",
|
|
"soong-remoteexec",
|
|
"soong-shared",
|
|
"soong-ui-build-paths",
|
|
"soong-ui-logger",
|
|
"soong-ui-metrics",
|
|
"soong-ui-status",
|
|
"soong-ui-terminal",
|
|
"soong-ui-tracer",
|
|
],
|
|
srcs: [
|
|
"androidmk_denylist.go",
|
|
"build.go",
|
|
"cleanbuild.go",
|
|
"config.go",
|
|
"context.go",
|
|
"staging_snapshot.go",
|
|
"dumpvars.go",
|
|
"environment.go",
|
|
"exec.go",
|
|
"finder.go",
|
|
"goma.go",
|
|
"kati.go",
|
|
"ninja.go",
|
|
"path.go",
|
|
"proc_sync.go",
|
|
"rbe.go",
|
|
"sandbox_config.go",
|
|
"soong.go",
|
|
"test_build.go",
|
|
"upload.go",
|
|
"util.go",
|
|
],
|
|
testSrcs: [
|
|
"cleanbuild_test.go",
|
|
"config_test.go",
|
|
"environment_test.go",
|
|
"proc_sync_test.go",
|
|
"rbe_test.go",
|
|
"staging_snapshot_test.go",
|
|
"util_test.go",
|
|
],
|
|
darwin: {
|
|
srcs: [
|
|
"config_darwin.go",
|
|
"sandbox_darwin.go",
|
|
],
|
|
},
|
|
linux: {
|
|
srcs: [
|
|
"config_linux.go",
|
|
"sandbox_linux.go",
|
|
],
|
|
testSrcs: [
|
|
"sandbox_linux_test.go",
|
|
],
|
|
},
|
|
}
|