Add toolchain() rule for declaring toolchains with type and constraints.

Part of #2219.

Change-Id: Ia0effac6e6c362c04c6501b21dde89e9e5b154a4
PiperOrigin-RevId: 161216492

1 files changed, 95 insertions, 0 deletions

diff --git a/src/test/java/com/google/devtools/build/lib/rules/platform/ToolchainTest.java b/src/test/java/com/google/devtools/build/lib/rules/platform/ToolchainTest.java
new file mode 100644
index 0000000000..e00314b84e
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/lib/rules/platform/ToolchainTest.java
@@ -0,0 +1,95 @@
+// Copyright 2017 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.platform;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.devtools.build.lib.analysis.ConfiguredTarget;
+import com.google.devtools.build.lib.analysis.platform.ConstraintSettingInfo;
+import com.google.devtools.build.lib.analysis.platform.ConstraintValueInfo;
+import com.google.devtools.build.lib.analysis.platform.DeclaredToolchainInfo;
+import com.google.devtools.build.lib.analysis.util.BuildViewTestCase;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Tests of {@link Toolchain}. */
+@RunWith(JUnit4.class)
+public class ToolchainTest extends BuildViewTestCase {
+
+  @Before
+  public void createConstraints() throws Exception {
+    scratch.file(
+        "constraint/BUILD",
+        "constraint_setting(name = 'basic')",
+        "constraint_value(name = 'foo',",
+        "    constraint_setting = ':basic',",
+        "    )",
+        "constraint_value(name = 'bar',",
+        "    constraint_setting = ':basic',",
+        "    )");
+  }
+
+  @Test
+  public void testToolchain() throws Exception {
+    scratch.file(
+        "toolchain/toolchain_def.bzl",
+        "def _impl(ctx):",
+        "  toolchain_type = ctx.attr._toolchain_type[platform_common.ToolchainTypeInfo]",
+        "  toolchain = platform_common.ToolchainInfo(",
+        "      type = toolchain_type,",
+        "      data = ctx.attr.data)",
+        "  return [toolchain]",
+        "toolchain_def = rule(",
+        "    implementation = _impl,",
+        "    attrs = {",
+        "        '_toolchain_type': attr.label(default = Label('//toolchain:demo_toolchain')),",
+        "       'data': attr.string()})");
+    scratch.file(
+        "toolchain/BUILD",
+        "load(':toolchain_def.bzl', 'toolchain_def')",
+        "toolchain_type(name = 'demo_toolchain')",
+        "toolchain(",
+        "  name = 'toolchain1',",
+        "  toolchain_type = ':demo_toolchain',",
+        "  exec_compatible_with = ['//constraint:foo'],",
+        "  target_compatible_with = ['//constraint:bar'],",
+        "  toolchain = ':toolchain_def1')",
+        "toolchain_def(",
+        "  name = 'toolchain_def1',",
+        "  data = 'foo')");
+
+    ConfiguredTarget target = getConfiguredTarget("//toolchain:toolchain1");
+    assertThat(target).isNotNull();
+
+    DeclaredToolchainInfo provider = target.getProvider(DeclaredToolchainInfo.class);
+    assertThat(provider).isNotNull();
+    assertThat(provider.toolchainType()).isEqualTo(makeLabel("//toolchain:demo_toolchain"));
+
+    assertThat(provider.execConstraints())
+        .containsExactly(
+            ConstraintValueInfo.create(
+                ConstraintSettingInfo.create(makeLabel("//constraint:basic")),
+                makeLabel("//constraint:foo")));
+    assertThat(provider.targetConstraints())
+        .containsExactly(
+            ConstraintValueInfo.create(
+                ConstraintSettingInfo.create(makeLabel("//constraint:basic")),
+                makeLabel("//constraint:bar")));
+
+    assertThat(provider.toolchainLabel()).isEqualTo(makeLabel("//toolchain:toolchain_def1"));
+  }
+}