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// 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 com.google.devtools.build.lib.actions.MutableActionGraph.ActionConflictException;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.FileProvider;
import com.google.devtools.build.lib.analysis.FilesToRunProvider;
import com.google.devtools.build.lib.analysis.PlatformOptions;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetFactory;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.RunfilesProvider;
import com.google.devtools.build.lib.analysis.config.AutoCpuConverter;
import com.google.devtools.build.lib.analysis.configuredtargets.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.analysis.platform.ConstraintValueInfo;
import com.google.devtools.build.lib.analysis.platform.PlatformInfo;
import com.google.devtools.build.lib.analysis.platform.PlatformProviderUtils;
import com.google.devtools.build.lib.syntax.Type;
import com.google.devtools.build.lib.util.CPU;
import com.google.devtools.build.lib.util.OS;
import com.google.devtools.build.lib.util.Pair;
/** Defines a platform for execution contexts. */
public class Platform implements RuleConfiguredTargetFactory {
@Override
public ConfiguredTarget create(RuleContext ruleContext)
throws InterruptedException, RuleErrorException, ActionConflictException {
PlatformInfo.Builder platformBuilder = PlatformInfo.builder().setLabel(ruleContext.getLabel());
Boolean isHostPlatform =
ruleContext.attributes().get(PlatformRule.HOST_PLATFORM_ATTR, Type.BOOLEAN);
Boolean isTargetPlatform =
ruleContext.attributes().get(PlatformRule.TARGET_PLATFORM_ATTR, Type.BOOLEAN);
if (isHostPlatform && isTargetPlatform) {
ruleContext.attributeError(
PlatformRule.HOST_PLATFORM_ATTR,
"A single platform cannot have both host_platform and target_platform set.");
return null;
} else if (isHostPlatform) {
// Create default constraints based on the current host OS and CPU values.
String cpuOption = ruleContext.getConfiguration().getHostCpu();
autodetectConstraints(cpuOption, ruleContext, platformBuilder);
} else if (isTargetPlatform) {
// Create default constraints based on the current OS and CPU values.
String cpuOption = ruleContext.getConfiguration().getCpu();
autodetectConstraints(cpuOption, ruleContext, platformBuilder);
}
// Add the declared constraints. Because setting the host_platform or target_platform attribute
// to true on a platform automatically includes the detected CPU and OS constraints, if the
// constraint_values attribute tries to add those, this will throw an error.
platformBuilder.addConstraints(
PlatformProviderUtils.constraintValues(
ruleContext.getPrerequisites(PlatformRule.CONSTRAINT_VALUES_ATTR, Mode.DONT_CHECK)));
String remoteExecutionProperties =
ruleContext.attributes().get(PlatformRule.REMOTE_EXECUTION_PROPS_ATTR, Type.STRING);
if (platformBuilder.getRemoteExecutionProperties() == null && isHostPlatform) {
// Use the default override.
PlatformOptions platformOptions =
ruleContext.getConfiguration().getOptions().get(PlatformOptions.class);
remoteExecutionProperties = platformOptions.hostPlatformRemotePropertiesOverride;
}
platformBuilder.setRemoteExecutionProperties(remoteExecutionProperties);
PlatformInfo platformInfo;
try {
platformInfo = platformBuilder.build();
} catch (PlatformInfo.DuplicateConstraintException e) {
// Report the error and return null.
ruleContext.attributeError(PlatformRule.CONSTRAINT_VALUES_ATTR, e.getMessage());
return null;
}
return new RuleConfiguredTargetBuilder(ruleContext)
.addProvider(RunfilesProvider.class, RunfilesProvider.EMPTY)
.addProvider(FileProvider.class, FileProvider.EMPTY)
.addProvider(FilesToRunProvider.class, FilesToRunProvider.EMPTY)
.addNativeDeclaredProvider(platformInfo)
.build();
}
private void autodetectConstraints(
String cpuOption, RuleContext ruleContext, PlatformInfo.Builder platformBuilder) {
Pair<CPU, OS> cpuValues = AutoCpuConverter.reverse(cpuOption);
// Add the CPU.
CPU cpu = cpuValues.getFirst();
Iterable<ConstraintValueInfo> cpuConstraintValues =
PlatformProviderUtils.constraintValues(
ruleContext.getPrerequisites(PlatformRule.CPU_CONSTRAINTS_ATTR, Mode.DONT_CHECK));
for (ConstraintValueInfo constraint : cpuConstraintValues) {
if (cpu.getCanonicalName().equals(constraint.label().getName())) {
platformBuilder.addConstraint(constraint);
break;
}
}
// Add the OS.
OS os = cpuValues.getSecond();
Iterable<ConstraintValueInfo> osConstraintValues =
PlatformProviderUtils.constraintValues(
ruleContext.getPrerequisites(PlatformRule.OS_CONSTRAINTS_ATTR, Mode.DONT_CHECK));
for (ConstraintValueInfo constraint : osConstraintValues) {
if (os.getCanonicalName().equals(constraint.label().getName())) {
platformBuilder.addConstraint(constraint);
break;
}
}
}
}
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