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// Copyright 2014 Google Inc. 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.syntax;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.profiler.Profiler;
import com.google.devtools.build.lib.profiler.ProfilerTask;
/**
* The actual function registered in the environment. This function is defined in the
* parsed code using {@link FunctionDefStatement}.
*/
public class UserDefinedFunction extends BaseFunction {
private final ImmutableList<Statement> statements;
private final SkylarkEnvironment definitionEnv;
protected UserDefinedFunction(Identifier function,
FunctionSignature.WithValues<Object, SkylarkType> signature,
ImmutableList<Statement> statements, SkylarkEnvironment definitionEnv) {
super(function.getName(), signature, function.getLocation());
this.statements = statements;
this.definitionEnv = definitionEnv;
}
public FunctionSignature.WithValues<Object, SkylarkType> getFunctionSignature() {
return signature;
}
ImmutableList<Statement> getStatements() {
return statements;
}
@Override
public Object call(Object[] arguments, FuncallExpression ast, Environment env)
throws EvalException, InterruptedException {
ImmutableList<String> names = signature.getSignature().getNames();
// Registering the functions's arguments as variables in the local Environment
int i = 0;
for (String name : names) {
env.update(name, arguments[i++]);
}
long startTimeProfiler = Profiler.nanoTimeMaybe();
Statement lastStatement = null;
try {
for (Statement stmt : statements) {
lastStatement = stmt;
stmt.exec(env);
}
} catch (ReturnStatement.ReturnException e) {
return e.getValue();
} catch (EvalExceptionWithStackTrace ex) {
// We need this block since the next "catch" must only catch EvalExceptions that don't have a
// stack trace yet.
throw ex;
} catch (EvalException ex) {
EvalExceptionWithStackTrace real =
new EvalExceptionWithStackTrace(ex, lastStatement.getLocation());
real.registerStatement(lastStatement);
throw real;
} finally {
Profiler.instance().logSimpleTask(startTimeProfiler, ProfilerTask.SKYLARK_USER_FN, getName());
}
return Runtime.NONE;
}
/**
* Creates a new environment for the execution of this function.
*/
@Override
protected Environment getOrCreateChildEnvironment(Environment parent) throws EvalException {
return SkylarkEnvironment.createEnvironmentForFunctionCalling(
parent, definitionEnv, this);
}
}
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