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io.trino.sql.gen.LambdaBytecodeGenerator Maven / Gradle / Ivy
/*
* 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 io.trino.sql.gen;
import com.google.common.base.VerifyException;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.primitives.Primitives;
import io.airlift.bytecode.Access;
import io.airlift.bytecode.BytecodeBlock;
import io.airlift.bytecode.BytecodeNode;
import io.airlift.bytecode.ClassDefinition;
import io.airlift.bytecode.FieldDefinition;
import io.airlift.bytecode.MethodDefinition;
import io.airlift.bytecode.Parameter;
import io.airlift.bytecode.ParameterizedType;
import io.airlift.bytecode.Scope;
import io.airlift.bytecode.Variable;
import io.airlift.bytecode.expression.BytecodeExpression;
import io.trino.metadata.FunctionManager;
import io.trino.operator.aggregation.AccumulatorCompiler;
import io.trino.spi.connector.ConnectorSession;
import io.trino.sql.relational.CallExpression;
import io.trino.sql.relational.ConstantExpression;
import io.trino.sql.relational.InputReferenceExpression;
import io.trino.sql.relational.LambdaDefinitionExpression;
import io.trino.sql.relational.RowExpression;
import io.trino.sql.relational.RowExpressionVisitor;
import io.trino.sql.relational.SpecialForm;
import io.trino.sql.relational.VariableReferenceExpression;
import org.objectweb.asm.Handle;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.Supplier;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static io.airlift.bytecode.Access.PRIVATE;
import static io.airlift.bytecode.Access.PUBLIC;
import static io.airlift.bytecode.Access.a;
import static io.airlift.bytecode.Parameter.arg;
import static io.airlift.bytecode.ParameterizedType.type;
import static io.airlift.bytecode.expression.BytecodeExpressions.constantFalse;
import static io.airlift.bytecode.expression.BytecodeExpressions.invokeDynamic;
import static io.trino.spi.StandardErrorCode.COMPILER_ERROR;
import static io.trino.spi.StandardErrorCode.NOT_SUPPORTED;
import static io.trino.sql.gen.BytecodeUtils.boxPrimitiveIfNecessary;
import static io.trino.sql.gen.BytecodeUtils.unboxPrimitiveIfNecessary;
import static io.trino.sql.gen.LambdaCapture.LAMBDA_CAPTURE_METHOD;
import static io.trino.sql.gen.LambdaExpressionExtractor.extractLambdaExpressions;
import static io.trino.util.CompilerUtils.defineClass;
import static io.trino.util.CompilerUtils.makeClassName;
import static io.trino.util.Failures.checkCondition;
import static java.util.Objects.requireNonNull;
import static org.objectweb.asm.Type.getMethodType;
import static org.objectweb.asm.Type.getType;
public final class LambdaBytecodeGenerator
{
private LambdaBytecodeGenerator() {}
public static Map generateMethodsForLambda(
ClassDefinition containerClassDefinition,
CallSiteBinder callSiteBinder,
CachedInstanceBinder cachedInstanceBinder,
RowExpression expression,
FunctionManager functionManager)
{
Set lambdaExpressions = ImmutableSet.copyOf(extractLambdaExpressions(expression));
ImmutableMap.Builder compiledLambdaMap = ImmutableMap.builder();
int counter = 0;
for (LambdaDefinitionExpression lambdaExpression : lambdaExpressions) {
CompiledLambda compiledLambda = preGenerateLambdaExpression(
lambdaExpression,
"lambda_" + counter,
containerClassDefinition,
compiledLambdaMap.buildOrThrow(),
callSiteBinder,
cachedInstanceBinder,
functionManager);
compiledLambdaMap.put(lambdaExpression, compiledLambda);
counter++;
}
return compiledLambdaMap.buildOrThrow();
}
/**
* @return a MethodHandle field that represents the lambda expression
*/
public static CompiledLambda preGenerateLambdaExpression(
LambdaDefinitionExpression lambdaExpression,
String methodName,
ClassDefinition classDefinition,
Map compiledLambdaMap,
CallSiteBinder callSiteBinder,
CachedInstanceBinder cachedInstanceBinder,
FunctionManager functionManager)
{
ImmutableList.Builder parameters = ImmutableList.builder();
ImmutableMap.Builder parameterMapBuilder = ImmutableMap.builder();
parameters.add(arg("session", ConnectorSession.class));
for (int i = 0; i < lambdaExpression.getArguments().size(); i++) {
Class type = Primitives.wrap(lambdaExpression.getArgumentTypes().get(i).getJavaType());
String argumentName = lambdaExpression.getArguments().get(i);
Parameter arg = arg("lambda_" + i + "_" + BytecodeUtils.sanitizeName(argumentName), type);
parameters.add(arg);
parameterMapBuilder.put(argumentName, new ParameterAndType(arg, type));
}
RowExpressionCompiler innerExpressionCompiler = new RowExpressionCompiler(
callSiteBinder,
cachedInstanceBinder,
variableReferenceCompiler(parameterMapBuilder.buildOrThrow()),
functionManager,
compiledLambdaMap);
return defineLambdaMethod(
innerExpressionCompiler,
classDefinition,
methodName,
parameters.build(),
lambdaExpression);
}
private static CompiledLambda defineLambdaMethod(
RowExpressionCompiler innerExpressionCompiler,
ClassDefinition classDefinition,
String methodName,
List inputParameters,
LambdaDefinitionExpression lambda)
{
checkCondition(inputParameters.size() <= 254, NOT_SUPPORTED, "Too many arguments for lambda expression");
Class returnType = Primitives.wrap(lambda.getBody().getType().getJavaType());
MethodDefinition method = classDefinition.declareMethod(a(PUBLIC), methodName, type(returnType), inputParameters);
Scope scope = method.getScope();
Variable wasNull = scope.declareVariable(boolean.class, "wasNull");
BytecodeNode compiledBody = innerExpressionCompiler.compile(lambda.getBody(), scope);
method.getBody()
.putVariable(wasNull, false)
.append(compiledBody)
.append(boxPrimitiveIfNecessary(scope, returnType))
.ret(returnType);
Handle lambdaAsmHandle = new Handle(
Opcodes.H_INVOKEVIRTUAL,
method.getThis().getType().getClassName(),
method.getName(),
method.getMethodDescriptor(),
false);
return new CompiledLambda(
lambdaAsmHandle,
method.getReturnType(),
method.getParameterTypes());
}
public static BytecodeNode generateLambda(
BytecodeGeneratorContext context,
List captureExpressions,
CompiledLambda compiledLambda,
Class lambdaInterface)
{
if (!lambdaInterface.isAnnotationPresent(FunctionalInterface.class)) {
// lambdaInterface is checked to be annotated with FunctionalInterface when generating ScalarFunctionImplementation
throw new VerifyException("lambda should be generated as class annotated with FunctionalInterface");
}
BytecodeBlock block = new BytecodeBlock().setDescription("Partial apply");
Scope scope = context.getScope();
Variable wasNull = scope.getVariable("wasNull");
// generate values to be captured
ImmutableList.Builder captureVariableBuilder = ImmutableList.builder();
for (RowExpression captureExpression : captureExpressions) {
Class valueType = Primitives.wrap(captureExpression.getType().getJavaType());
Variable valueVariable = scope.createTempVariable(valueType);
block.append(context.generate(captureExpression));
block.append(boxPrimitiveIfNecessary(scope, valueType));
block.putVariable(valueVariable);
block.append(wasNull.set(constantFalse()));
captureVariableBuilder.add(valueVariable);
}
List captureVariables = ImmutableList.builder()
.add(scope.getThis(), scope.getVariable("session"))
.addAll(captureVariableBuilder.build())
.build();
Type instantiatedMethodAsmType = getMethodType(
compiledLambda.getReturnType().getAsmType(),
compiledLambda.getParameterTypes().stream()
.skip(captureExpressions.size() + 1) // skip capture variables and ConnectorSession
.map(ParameterizedType::getAsmType)
.toArray(Type[]::new));
block.append(
invokeDynamic(
LAMBDA_CAPTURE_METHOD,
ImmutableList.of(
getType(getSingleApplyMethod(lambdaInterface)),
compiledLambda.getLambdaAsmHandle(),
instantiatedMethodAsmType),
"apply",
type(lambdaInterface),
captureVariables));
return block;
}
public static Class> compileLambdaProvider(LambdaDefinitionExpression lambdaExpression, FunctionManager functionManager, Class lambdaInterface)
{
ClassDefinition lambdaProviderClassDefinition = new ClassDefinition(
a(PUBLIC, Access.FINAL),
makeClassName("LambdaProvider"),
type(Object.class),
type(Supplier.class, Object.class));
FieldDefinition sessionField = lambdaProviderClassDefinition.declareField(a(PRIVATE), "session", ConnectorSession.class);
CallSiteBinder callSiteBinder = new CallSiteBinder();
CachedInstanceBinder cachedInstanceBinder = new CachedInstanceBinder(lambdaProviderClassDefinition, callSiteBinder);
Map compiledLambdaMap = generateMethodsForLambda(
lambdaProviderClassDefinition,
callSiteBinder,
cachedInstanceBinder,
lambdaExpression,
functionManager);
MethodDefinition method = lambdaProviderClassDefinition.declareMethod(
a(PUBLIC),
"get",
type(Object.class),
ImmutableList.of());
Scope scope = method.getScope();
BytecodeBlock body = method.getBody();
scope.declareVariable("wasNull", body, constantFalse());
scope.declareVariable("session", body, method.getThis().getField(sessionField));
RowExpressionCompiler rowExpressionCompiler = new RowExpressionCompiler(
callSiteBinder,
cachedInstanceBinder,
variableReferenceCompiler(ImmutableMap.of()),
functionManager,
compiledLambdaMap);
BytecodeGeneratorContext generatorContext = new BytecodeGeneratorContext(
rowExpressionCompiler,
scope,
callSiteBinder,
cachedInstanceBinder,
functionManager);
body.append(
generateLambda(
generatorContext,
ImmutableList.of(),
compiledLambdaMap.get(lambdaExpression),
lambdaInterface))
.retObject();
// constructor
Parameter sessionParameter = arg("session", ConnectorSession.class);
MethodDefinition constructorDefinition = lambdaProviderClassDefinition.declareConstructor(a(PUBLIC), sessionParameter);
BytecodeBlock constructorBody = constructorDefinition.getBody();
Variable constructorThisVariable = constructorDefinition.getThis();
constructorBody.comment("super();")
.append(constructorThisVariable)
.invokeConstructor(Object.class)
.append(constructorThisVariable.setField(sessionField, sessionParameter));
cachedInstanceBinder.generateInitializations(constructorThisVariable, constructorBody);
constructorBody.ret();
//noinspection unchecked
return (Class>) defineClass(lambdaProviderClassDefinition, Supplier.class, callSiteBinder.getBindings(), AccumulatorCompiler.class.getClassLoader());
}
private static Method getSingleApplyMethod(Class lambdaFunctionInterface)
{
checkCondition(lambdaFunctionInterface.isAnnotationPresent(FunctionalInterface.class), COMPILER_ERROR, "Lambda function interface is required to be annotated with FunctionalInterface");
List applyMethods = Arrays.stream(lambdaFunctionInterface.getMethods())
.filter(method -> method.getName().equals("apply"))
.collect(toImmutableList());
checkCondition(applyMethods.size() == 1, COMPILER_ERROR, "Expect to have exactly 1 method with name 'apply' in interface " + lambdaFunctionInterface.getName());
return applyMethods.get(0);
}
private static RowExpressionVisitor variableReferenceCompiler(Map parameterMap)
{
return new RowExpressionVisitor<>()
{
@Override
public BytecodeNode visitInputReference(InputReferenceExpression node, Scope scope)
{
throw new UnsupportedOperationException();
}
@Override
public BytecodeNode visitCall(CallExpression call, Scope scope)
{
throw new UnsupportedOperationException();
}
@Override
public BytecodeNode visitSpecialForm(SpecialForm specialForm, Scope context)
{
throw new UnsupportedOperationException();
}
@Override
public BytecodeNode visitConstant(ConstantExpression literal, Scope scope)
{
throw new UnsupportedOperationException();
}
@Override
public BytecodeNode visitLambda(LambdaDefinitionExpression lambda, Scope context)
{
throw new UnsupportedOperationException();
}
@Override
public BytecodeNode visitVariableReference(VariableReferenceExpression reference, Scope context)
{
ParameterAndType parameterAndType = parameterMap.get(reference.getName());
Parameter parameter = parameterAndType.getParameter();
Class type = parameterAndType.getType();
return new BytecodeBlock()
.append(parameter)
.append(unboxPrimitiveIfNecessary(context, type));
}
};
}
public static class CompiledLambda
{
// lambda method information
private final Handle lambdaAsmHandle;
private final ParameterizedType returnType;
private final List parameterTypes;
public CompiledLambda(
Handle lambdaAsmHandle,
ParameterizedType returnType,
List parameterTypes)
{
this.lambdaAsmHandle = requireNonNull(lambdaAsmHandle, "lambdaAsmHandle is null");
this.returnType = requireNonNull(returnType, "returnType is null");
this.parameterTypes = ImmutableList.copyOf(requireNonNull(parameterTypes, "parameterTypes is null"));
}
public Handle getLambdaAsmHandle()
{
return lambdaAsmHandle;
}
public ParameterizedType getReturnType()
{
return returnType;
}
public List getParameterTypes()
{
return parameterTypes;
}
}
}
