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a4dd314c9e
When iterating on core library changes or changes in the AOT compiler
many seconds are wasted waiting on gen_kernel/compile_platform to
parse Dart code. This happens because we are running these tools
from sources on prebuilt Dart SDK.
This CL allows SDK developer to opt-in into AOT compiling these
tools by adding `precompile_tools=true` to their DART_GN_ARGS.
AOT compilation is performed using prebuilt SDK - so these
executables do not need to be recompiled if core libraries or
VM changes reducing iteration cycles.
pkg/vm/tool/precompiler2 is tweaked to detect when DART_GN_ARGS
contains `precompile_tools=true` and use precompiled
gen_kernel.exe instead of running it from source.
Using precompiled compile_platform takes vm_platform_strong.dill
build from 20 seconds to 3 seconds.
Using precompiled gen_kernel takes small benchmark build from
~10 seconds to 2 seconds.
This relands 5cda2a871c with fixes
for Flutter build.
TEST=manually tested
Change-Id: I552861c80c152890655e41baaf6ea3fb3b03a57e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/367961
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Slava Egorov <vegorov@google.com>
69 lines
2.6 KiB
Plaintext
69 lines
2.6 KiB
Plaintext
# Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
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# for details. All rights reserved. Use of this source code is governed by a
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# BSD-style license that can be found in the LICENSE file.
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_dart_root = get_path_info(".", "abspath")
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declare_args() {
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# Absolute path to the .git folder.
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#
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# This is used in rules that need to refer to `.git/logs/HEAD` to include
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# a hash in the version string. By default the folder is `.git`, but we define
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# it as an argument so it can be overridden by users of `git-worktree` (See
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# Issue #33619).
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#
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# When using git-worktree, you can add
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#
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# default_git_folder = "/path/to/main/git/repo/.git/worktrees/name/"
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#
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# to out/ReleaseX64/args.gn. The path above can be extracted from the `.git`
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# file under the git worktree folder.
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# The script run here should take care of everything automatically though.
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default_git_folder = ""
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# Whether to enable the SDK hash check that will prevent loading a kernel
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# into a VM which was built with a different SDK.
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verify_sdk_hash = true
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# When verify_sdk_hash is true, this string is used as the verification hash
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# instead of calculating one from the contents of the tree using the
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# make_version.py script.
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dart_sdk_verification_hash = ""
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# The location in the build output directory of the built Dart SDK.
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dart_sdk_output = "dart-sdk"
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# When set to `true` will cause compile_platform action to use a precompiled
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# compile_platform.dart script instead of running it from source. This
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# can significantly improve iteration time when iteration on changes in
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# core libraries.
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precompile_tools = false
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}
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if (default_git_folder == "") {
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default_git_folder = exec_script("$_dart_root/tools/get_dot_git_folder.py",
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[
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rebase_path("$_dart_root/.git"),
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"$_dart_root/.git",
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],
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"trim string")
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}
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# The SDK hash to build into VM and kernels.
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# The value 0000000000 signifies no hash is set, which will disable the check.
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if (verify_sdk_hash) {
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sdk_hash = dart_sdk_verification_hash
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if (sdk_hash == "") {
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sdk_hash = exec_script("$_dart_root/tools/make_version.py",
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[ "--format={{GIT_HASH}}" ],
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"trim string",
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[
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"$_dart_root/tools/VERSION",
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"$_dart_root/tools/utils.py",
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"$default_git_folder/logs/HEAD",
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])
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}
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} else {
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sdk_hash = "0000000000"
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}
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