| // Copyright 2014 The Bazel Authors. 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 com.google.devtools.build.lib.skyframe; |
| |
| import com.google.common.collect.ImmutableMap; |
| import com.google.devtools.build.lib.analysis.BlazeDirectories; |
| import com.google.devtools.build.lib.cmdline.PackageIdentifier; |
| import com.google.devtools.build.lib.packages.NoSuchPackageException; |
| import com.google.devtools.build.lib.packages.Package; |
| import com.google.devtools.build.lib.packages.Package.NameConflictException; |
| import com.google.devtools.build.lib.packages.PackageFactory; |
| import com.google.devtools.build.lib.packages.RuleClassProvider; |
| import com.google.devtools.build.lib.packages.WorkspaceFactory; |
| import com.google.devtools.build.lib.skyframe.WorkspaceFileValue.WorkspaceFileKey; |
| import com.google.devtools.build.lib.syntax.BuildFileAST; |
| import com.google.devtools.build.lib.syntax.Environment.Extension; |
| import com.google.devtools.build.lib.syntax.Mutability; |
| import com.google.devtools.build.lib.syntax.SkylarkSemantics; |
| import com.google.devtools.build.lib.vfs.RootedPath; |
| import com.google.devtools.build.skyframe.SkyFunction; |
| import com.google.devtools.build.skyframe.SkyFunctionException; |
| import com.google.devtools.build.skyframe.SkyFunctionException.Transience; |
| import com.google.devtools.build.skyframe.SkyKey; |
| import com.google.devtools.build.skyframe.SkyValue; |
| import java.io.IOException; |
| import java.util.Map; |
| import java.util.function.Function; |
| import java.util.stream.Collectors; |
| |
| /** |
| * A SkyFunction to parse WORKSPACE files. |
| */ |
| public class WorkspaceFileFunction implements SkyFunction { |
| |
| private final PackageFactory packageFactory; |
| private final BlazeDirectories directories; |
| private final RuleClassProvider ruleClassProvider; |
| private static final PackageIdentifier rootPackage = PackageIdentifier.createInMainRepo(""); |
| |
| public WorkspaceFileFunction( |
| RuleClassProvider ruleClassProvider, |
| PackageFactory packageFactory, |
| BlazeDirectories directories) { |
| this.packageFactory = packageFactory; |
| this.directories = directories; |
| this.ruleClassProvider = ruleClassProvider; |
| } |
| |
| @Override |
| public SkyValue compute(SkyKey skyKey, Environment env) |
| throws WorkspaceFileFunctionException, InterruptedException { |
| |
| WorkspaceFileKey key = (WorkspaceFileKey) skyKey.argument(); |
| RootedPath workspaceRoot = key.getPath(); |
| WorkspaceASTValue workspaceASTValue = (WorkspaceASTValue) env.getValue( |
| WorkspaceASTValue.key(workspaceRoot)); |
| if (workspaceASTValue == null) { |
| return null; |
| } |
| SkylarkSemantics skylarkSemantics = PrecomputedValue.SKYLARK_SEMANTICS.get(env); |
| if (skylarkSemantics == null) { |
| return null; |
| } |
| |
| RootedPath repoWorkspace = |
| RootedPath.toRootedPath(workspaceRoot.getRoot(), workspaceRoot.getRootRelativePath()); |
| Package.Builder builder = packageFactory.newExternalPackageBuilder( |
| repoWorkspace, ruleClassProvider.getRunfilesPrefix()); |
| |
| if (workspaceASTValue.getASTs().isEmpty()) { |
| try { |
| return new WorkspaceFileValue( |
| /* pkg = */ builder.build(), |
| /* importMap = */ ImmutableMap.<String, Extension>of(), |
| /* importToChunkMap = */ ImmutableMap.<String, Integer>of(), |
| /* bindings = */ ImmutableMap.<String, Object>of(), |
| workspaceRoot, |
| /* idx = */ 0, // first fragment |
| /* hasNext = */ false); |
| } catch (NoSuchPackageException e) { |
| throw new WorkspaceFileFunctionException(e, Transience.TRANSIENT); |
| } |
| } |
| WorkspaceFactory parser; |
| WorkspaceFileValue prevValue = null; |
| try (Mutability mutability = Mutability.create("workspace %s", repoWorkspace)) { |
| parser = |
| new WorkspaceFactory( |
| builder, |
| ruleClassProvider, |
| packageFactory.getEnvironmentExtensions(), |
| mutability, |
| key.getIndex() == 0, |
| directories.getEmbeddedBinariesRoot(), |
| directories.getWorkspace(), |
| directories.getLocalJavabase()); |
| if (key.getIndex() > 0) { |
| prevValue = |
| (WorkspaceFileValue) |
| env.getValue(WorkspaceFileValue.key(key.getPath(), key.getIndex() - 1)); |
| if (prevValue == null) { |
| return null; |
| } |
| if (prevValue.next() == null) { |
| return prevValue; |
| } |
| parser.setParent(prevValue.getPackage(), prevValue.getImportMap(), prevValue.getBindings()); |
| } |
| BuildFileAST ast = workspaceASTValue.getASTs().get(key.getIndex()); |
| PackageFunction.SkylarkImportResult importResult = |
| PackageFunction.fetchImportsFromBuildFile( |
| repoWorkspace, rootPackage, ast, key.getIndex(), env, null); |
| if (importResult == null) { |
| return null; |
| } |
| parser.execute(ast, importResult.importMap, skylarkSemantics); |
| } catch (NoSuchPackageException e) { |
| throw new WorkspaceFileFunctionException(e, Transience.PERSISTENT); |
| } catch (NameConflictException e) { |
| throw new WorkspaceFileFunctionException(e, Transience.PERSISTENT); |
| } |
| |
| try { |
| return new WorkspaceFileValue( |
| builder.build(), |
| parser.getImportMap(), |
| createImportToChunkMap(prevValue, parser, key), |
| parser.getVariableBindings(), |
| workspaceRoot, |
| key.getIndex(), |
| key.getIndex() < workspaceASTValue.getASTs().size() - 1); |
| } catch (NoSuchPackageException e) { |
| throw new WorkspaceFileFunctionException(e, Transience.TRANSIENT); |
| } |
| } |
| |
| /** |
| * This returns a map from import statement to the chunk the |
| * import statement originated from. |
| * |
| * For example, if the WORKSPACE file looked like the following: |
| * load(":a.bzl", "a") |
| * x = 0 |
| * load(":b.bzl", "b") |
| * x = 1 |
| * load(":a.bzl", "a1") |
| * load(":c.bzl", "c") |
| * x = 2 |
| * |
| * Then the map for chunk 0 would be: {@code {":a.bzl" : 0}} |
| * for chunk 1 would be: {@code {":a.bzl" : 0, ":b.bzl" : 1}} |
| * for chunk 2 would be: {@code {":a.bzl" : 0, ":b.bzl" : 1, ":c.bzl" : 2}} |
| */ |
| private ImmutableMap<String, Integer> createImportToChunkMap( |
| WorkspaceFileValue prevValue, WorkspaceFactory parser, WorkspaceFileKey key) { |
| ImmutableMap.Builder<String, Integer> builder = new ImmutableMap.Builder<String, Integer>(); |
| if (prevValue == null) { |
| Map<String, Integer> map = |
| parser.getImportMap().keySet().stream() |
| .collect(Collectors.toMap(Function.identity(), s -> key.getIndex())); |
| builder.putAll(map); |
| } else { |
| builder.putAll(prevValue.getImportToChunkMap()); |
| for (String label : parser.getImportMap().keySet()) { |
| if (!prevValue.getImportToChunkMap().containsKey(label)) { |
| builder.put(label, key.getIndex()); |
| } |
| } |
| } |
| return builder.build(); |
| } |
| |
| @Override |
| public String extractTag(SkyKey skyKey) { |
| return null; |
| } |
| |
| private static final class WorkspaceFileFunctionException extends SkyFunctionException { |
| WorkspaceFileFunctionException(NoSuchPackageException e, Transience transience) { |
| super(e, transience); |
| } |
| |
| WorkspaceFileFunctionException(NameConflictException e, Transience transience) { |
| super(e, transience); |
| } |
| |
| WorkspaceFileFunctionException(IOException e, Transience transience) { |
| super(e, transience); |
| } |
| } |
| } |