Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance.
Project price only 1 $
You can buy this project and download/modify it how often you want.
io.prestosql.sql.gen.CursorProcessorCompiler 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.prestosql.sql.gen;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.primitives.Primitives;
import io.airlift.bytecode.BytecodeBlock;
import io.airlift.bytecode.BytecodeNode;
import io.airlift.bytecode.ClassDefinition;
import io.airlift.bytecode.MethodDefinition;
import io.airlift.bytecode.Parameter;
import io.airlift.bytecode.Scope;
import io.airlift.bytecode.Variable;
import io.airlift.bytecode.control.IfStatement;
import io.airlift.bytecode.control.WhileLoop;
import io.airlift.bytecode.instruction.LabelNode;
import io.airlift.slice.Slice;
import io.prestosql.metadata.Metadata;
import io.prestosql.operator.DriverYieldSignal;
import io.prestosql.operator.project.CursorProcessorOutput;
import io.prestosql.spi.PageBuilder;
import io.prestosql.spi.block.BlockBuilder;
import io.prestosql.spi.connector.ConnectorSession;
import io.prestosql.spi.connector.RecordCursor;
import io.prestosql.spi.type.Type;
import io.prestosql.sql.gen.LambdaBytecodeGenerator.CompiledLambda;
import io.prestosql.sql.relational.CallExpression;
import io.prestosql.sql.relational.ConstantExpression;
import io.prestosql.sql.relational.InputReferenceExpression;
import io.prestosql.sql.relational.LambdaDefinitionExpression;
import io.prestosql.sql.relational.RowExpression;
import io.prestosql.sql.relational.RowExpressionVisitor;
import io.prestosql.sql.relational.SpecialForm;
import io.prestosql.sql.relational.VariableReferenceExpression;
import java.util.List;
import java.util.Map;
import java.util.Set;
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.constantTrue;
import static io.airlift.bytecode.expression.BytecodeExpressions.newInstance;
import static io.airlift.bytecode.expression.BytecodeExpressions.or;
import static io.airlift.bytecode.instruction.JumpInstruction.jump;
import static io.prestosql.sql.gen.BytecodeUtils.generateWrite;
import static io.prestosql.sql.gen.LambdaExpressionExtractor.extractLambdaExpressions;
import static java.lang.String.format;
public class CursorProcessorCompiler
implements BodyCompiler
{
private final Metadata metadata;
public CursorProcessorCompiler(Metadata metadata)
{
this.metadata = metadata;
}
@Override
public void generateMethods(ClassDefinition classDefinition, CallSiteBinder callSiteBinder, RowExpression filter, List projections)
{
CachedInstanceBinder cachedInstanceBinder = new CachedInstanceBinder(classDefinition, callSiteBinder);
generateProcessMethod(classDefinition, projections.size());
Map filterCompiledLambdaMap = generateMethodsForLambda(classDefinition, callSiteBinder, cachedInstanceBinder, filter, "filter");
generateFilterMethod(classDefinition, callSiteBinder, cachedInstanceBinder, filterCompiledLambdaMap, filter);
for (int i = 0; i < projections.size(); i++) {
String methodName = "project_" + i;
Map projectCompiledLambdaMap = generateMethodsForLambda(classDefinition, callSiteBinder, cachedInstanceBinder, projections.get(i), methodName);
generateProjectMethod(classDefinition, callSiteBinder, cachedInstanceBinder, projectCompiledLambdaMap, methodName, projections.get(i));
}
MethodDefinition constructorDefinition = classDefinition.declareConstructor(a(PUBLIC));
BytecodeBlock constructorBody = constructorDefinition.getBody();
Variable thisVariable = constructorDefinition.getThis();
constructorBody.comment("super();")
.append(thisVariable)
.invokeConstructor(Object.class);
cachedInstanceBinder.generateInitializations(thisVariable, constructorBody);
constructorBody.ret();
}
private static void generateProcessMethod(ClassDefinition classDefinition, int projections)
{
Parameter session = arg("session", ConnectorSession.class);
Parameter yieldSignal = arg("yieldSignal", DriverYieldSignal.class);
Parameter cursor = arg("cursor", RecordCursor.class);
Parameter pageBuilder = arg("pageBuilder", PageBuilder.class);
MethodDefinition method = classDefinition.declareMethod(a(PUBLIC), "process", type(CursorProcessorOutput.class), session, yieldSignal, cursor, pageBuilder);
Scope scope = method.getScope();
Variable completedPositionsVariable = scope.declareVariable(int.class, "completedPositions");
Variable finishedVariable = scope.declareVariable(boolean.class, "finished");
method.getBody()
.comment("int completedPositions = 0;")
.putVariable(completedPositionsVariable, 0)
.comment("boolean finished = false;")
.putVariable(finishedVariable, false);
// while loop loop body
LabelNode done = new LabelNode("done");
WhileLoop whileLoop = new WhileLoop()
.condition(constantTrue())
.body(new BytecodeBlock()
.comment("if (pageBuilder.isFull() || yieldSignal.isSet()) return new CursorProcessorOutput(completedPositions, false);")
.append(new IfStatement()
.condition(or(
pageBuilder.invoke("isFull", boolean.class),
yieldSignal.invoke("isSet", boolean.class)))
.ifTrue(jump(done)))
.comment("if (!cursor.advanceNextPosition()) return new CursorProcessorOutput(completedPositions, true);")
.append(new IfStatement()
.condition(cursor.invoke("advanceNextPosition", boolean.class))
.ifFalse(new BytecodeBlock()
.putVariable(finishedVariable, true)
.gotoLabel(done)))
.comment("do the projection")
.append(createProjectIfStatement(classDefinition, method, session, cursor, pageBuilder, projections))
.comment("completedPositions++;")
.incrementVariable(completedPositionsVariable, (byte) 1));
method.getBody()
.append(whileLoop)
.visitLabel(done)
.append(newInstance(CursorProcessorOutput.class, completedPositionsVariable, finishedVariable)
.ret());
}
private static IfStatement createProjectIfStatement(
ClassDefinition classDefinition,
MethodDefinition method,
Parameter session,
Parameter cursor,
Parameter pageBuilder,
int projections)
{
// if (filter(cursor))
IfStatement ifStatement = new IfStatement();
ifStatement.condition()
.append(method.getThis())
.getVariable(session)
.getVariable(cursor)
.invokeVirtual(classDefinition.getType(), "filter", type(boolean.class), type(ConnectorSession.class), type(RecordCursor.class));
// pageBuilder.declarePosition();
ifStatement.ifTrue()
.getVariable(pageBuilder)
.invokeVirtual(PageBuilder.class, "declarePosition", void.class);
// this.project_43(session, cursor, pageBuilder.getBlockBuilder(42)));
for (int projectionIndex = 0; projectionIndex < projections; projectionIndex++) {
ifStatement.ifTrue()
.append(method.getThis())
.getVariable(session)
.getVariable(cursor);
// pageBuilder.getBlockBuilder(0)
ifStatement.ifTrue()
.getVariable(pageBuilder)
.push(projectionIndex)
.invokeVirtual(PageBuilder.class, "getBlockBuilder", BlockBuilder.class, int.class);
// project(block..., blockBuilder)gen
ifStatement.ifTrue()
.invokeVirtual(classDefinition.getType(),
"project_" + projectionIndex,
type(void.class),
type(ConnectorSession.class),
type(RecordCursor.class),
type(BlockBuilder.class));
}
return ifStatement;
}
private Map generateMethodsForLambda(
ClassDefinition containerClassDefinition,
CallSiteBinder callSiteBinder,
CachedInstanceBinder cachedInstanceBinder,
RowExpression projection,
String methodPrefix)
{
Set lambdaExpressions = ImmutableSet.copyOf(extractLambdaExpressions(projection));
ImmutableMap.Builder compiledLambdaMap = ImmutableMap.builder();
int counter = 0;
for (LambdaDefinitionExpression lambdaExpression : lambdaExpressions) {
String methodName = methodPrefix + "_lambda_" + counter;
CompiledLambda compiledLambda = LambdaBytecodeGenerator.preGenerateLambdaExpression(
lambdaExpression,
methodName,
containerClassDefinition,
compiledLambdaMap.build(),
callSiteBinder,
cachedInstanceBinder,
metadata);
compiledLambdaMap.put(lambdaExpression, compiledLambda);
counter++;
}
return compiledLambdaMap.build();
}
private void generateFilterMethod(
ClassDefinition classDefinition,
CallSiteBinder callSiteBinder,
CachedInstanceBinder cachedInstanceBinder,
Map compiledLambdaMap,
RowExpression filter)
{
Parameter session = arg("session", ConnectorSession.class);
Parameter cursor = arg("cursor", RecordCursor.class);
MethodDefinition method = classDefinition.declareMethod(a(PUBLIC), "filter", type(boolean.class), session, cursor);
method.comment("Filter: %s", filter);
Scope scope = method.getScope();
Variable wasNullVariable = scope.declareVariable(type(boolean.class), "wasNull");
RowExpressionCompiler compiler = new RowExpressionCompiler(
callSiteBinder,
cachedInstanceBinder,
fieldReferenceCompiler(cursor),
metadata,
compiledLambdaMap);
LabelNode end = new LabelNode("end");
method.getBody()
.comment("boolean wasNull = false;")
.putVariable(wasNullVariable, false)
.comment("evaluate filter: " + filter)
.append(compiler.compile(filter, scope))
.comment("if (wasNull) return false;")
.getVariable(wasNullVariable)
.ifFalseGoto(end)
.pop(boolean.class)
.push(false)
.visitLabel(end)
.retBoolean();
}
private void generateProjectMethod(
ClassDefinition classDefinition,
CallSiteBinder callSiteBinder,
CachedInstanceBinder cachedInstanceBinder,
Map compiledLambdaMap,
String methodName,
RowExpression projection)
{
Parameter session = arg("session", ConnectorSession.class);
Parameter cursor = arg("cursor", RecordCursor.class);
Parameter output = arg("output", BlockBuilder.class);
MethodDefinition method = classDefinition.declareMethod(a(PUBLIC), methodName, type(void.class), session, cursor, output);
method.comment("Projection: %s", projection.toString());
Scope scope = method.getScope();
Variable wasNullVariable = scope.declareVariable(type(boolean.class), "wasNull");
RowExpressionCompiler compiler = new RowExpressionCompiler(
callSiteBinder,
cachedInstanceBinder,
fieldReferenceCompiler(cursor),
metadata,
compiledLambdaMap);
method.getBody()
.comment("boolean wasNull = false;")
.putVariable(wasNullVariable, false)
.getVariable(output)
.comment("evaluate projection: " + projection.toString())
.append(compiler.compile(projection, scope))
.append(generateWrite(callSiteBinder, scope, wasNullVariable, projection.getType()))
.ret();
}
private static RowExpressionVisitor fieldReferenceCompiler(Variable cursorVariable)
{
return new RowExpressionVisitor<>()
{
@Override
public BytecodeNode visitInputReference(InputReferenceExpression node, Scope scope)
{
int field = node.getField();
Type type = node.getType();
Variable wasNullVariable = scope.getVariable("wasNull");
Class javaType = type.getJavaType();
if (!javaType.isPrimitive() && javaType != Slice.class) {
javaType = Object.class;
}
IfStatement ifStatement = new IfStatement();
ifStatement.condition()
.setDescription(format("cursor.get%s(%d)", type, field))
.getVariable(cursorVariable)
.push(field)
.invokeInterface(RecordCursor.class, "isNull", boolean.class, int.class);
ifStatement.ifTrue()
.putVariable(wasNullVariable, true)
.pushJavaDefault(javaType);
ifStatement.ifFalse()
.getVariable(cursorVariable)
.push(field)
.invokeInterface(RecordCursor.class, "get" + Primitives.wrap(javaType).getSimpleName(), javaType, int.class);
return ifStatement;
}
@Override
public BytecodeNode visitCall(CallExpression call, Scope scope)
{
throw new UnsupportedOperationException("not yet implemented");
}
@Override
public BytecodeNode visitSpecialForm(SpecialForm specialForm, Scope context)
{
throw new UnsupportedOperationException("not yet implemented");
}
@Override
public BytecodeNode visitConstant(ConstantExpression literal, Scope scope)
{
throw new UnsupportedOperationException("not yet implemented");
}
@Override
public BytecodeNode visitLambda(LambdaDefinitionExpression lambda, Scope context)
{
throw new UnsupportedOperationException();
}
@Override
public BytecodeNode visitVariableReference(VariableReferenceExpression reference, Scope context)
{
throw new UnsupportedOperationException();
}
};
}
}
