Rename ToolchainLookup rule to ToolchainType, to better explain the usage of

the rule.

Example:
tools/newlang/BUILD:
  toolchain_type(name = "toolchain_type")
Allows users to refer to //tools/newlang:toolchain_type when discussing the
newlang toolchain.

The previous usage:
tools/newlang/BUILD:
  toolchain_lookup(name = "lookup")
Lead to labels like //tools/newlang:lookup, which was unclear that each
language's toolchain needs one unique instance of toolchain_(lookup|type).

--
PiperOrigin-RevId: 151326827
MOS_MIGRATED_REVID=151326827

1 files changed, 68 insertions, 0 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/rules/ToolchainType.java b/src/main/java/com/google/devtools/build/lib/rules/ToolchainType.java
new file mode 100644
index 0000000000..a752db0da2
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/rules/ToolchainType.java
@@ -0,0 +1,68 @@
+// Copyright 2016 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.rules;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.devtools.build.lib.analysis.ConfiguredTarget;
+import com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder;
+import com.google.devtools.build.lib.analysis.RuleContext;
+import com.google.devtools.build.lib.analysis.Runfiles;
+import com.google.devtools.build.lib.analysis.RunfilesProvider;
+import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
+import com.google.devtools.build.lib.cmdline.Label;
+import java.util.TreeMap;
+
+/**
+ * Abstract base class for {@code toolchain_type}.
+ */
+public class ToolchainType implements RuleConfiguredTargetFactory {
+  private final ImmutableMap<Label, Class<? extends BuildConfiguration.Fragment>> fragmentMap;
+  private final ImmutableMap<Label, ImmutableMap<String, String>> hardcodedVariableMap;
+
+  protected ToolchainType(
+      ImmutableMap<Label, Class<? extends BuildConfiguration.Fragment>> fragmentMap,
+      ImmutableMap<Label, ImmutableMap<String, String>> hardcodedVariableMap) {
+    this.fragmentMap = fragmentMap;
+    this.hardcodedVariableMap = hardcodedVariableMap;
+  }
+
+  @Override
+  public ConfiguredTarget create(RuleContext ruleContext)
+      throws InterruptedException, RuleErrorException {
+    // This cannot be an ImmutableMap.Builder because that asserts when a key is duplicated
+    TreeMap<String, String> makeVariables = new TreeMap<>();
+    Class<? extends BuildConfiguration.Fragment> fragmentClass =
+        fragmentMap.get(ruleContext.getLabel());
+    if (fragmentClass != null) {
+      BuildConfiguration.Fragment fragment = ruleContext.getFragment(fragmentClass);
+      ImmutableMap.Builder<String, String> fragmentBuilder = ImmutableMap.builder();
+      fragment.addGlobalMakeVariables(fragmentBuilder);
+      makeVariables.putAll(fragmentBuilder.build());
+    }
+
+    ImmutableMap<String, String> hardcodedVariables =
+        hardcodedVariableMap.get(ruleContext.getLabel());
+    if (hardcodedVariables != null) {
+      makeVariables.putAll(hardcodedVariables);
+    }
+    // This will eventually go to Skyframe using getAnalysisEnvironment.getSkyframeEnv() to figure
+    // out the lookup rule -> toolchain rule mapping. For now, it only provides Make variables that
+    // come from BuildConfiguration so no need to ask Skyframe.
+    return new RuleConfiguredTargetBuilder(ruleContext)
+        .addProvider(new ToolchainProvider(ImmutableMap.copyOf(makeVariables)))
+        .addProvider(RunfilesProvider.simple(Runfiles.EMPTY))
+        .build();
+  }
+}