@Override
public Void visitFor(ByteCodeNode parent, ForLoop forLoop) {
if (forLoop.getComment() != null) {
printLine();
printLine("// %s", forLoop.getComment());
}
printLine("for {");
indentLevel++;
visitNestedNode("initialize", forLoop.initialize(), forLoop);
visitNestedNode("condition", forLoop.condition(), forLoop);
visitNestedNode("update", forLoop.update(), forLoop);
visitNestedNode("body", forLoop.body(), forLoop);
indentLevel--;
printLine("}");
return null;
}
private void generateFilterAndProjectCursorMethod(
ClassDefinition classDefinition, List<RowExpression> projections) {
MethodDefinition filterAndProjectMethod =
classDefinition.declareMethod(
new CompilerContext(BOOTSTRAP_METHOD),
a(PUBLIC),
"filterAndProjectRowOriented",
type(int.class),
arg("cursor", RecordCursor.class),
arg("pageBuilder", PageBuilder.class));
CompilerContext compilerContext = filterAndProjectMethod.getCompilerContext();
LocalVariableDefinition completedPositionsVariable =
compilerContext.declareVariable(int.class, "completedPositions");
filterAndProjectMethod
.getBody()
.comment("int completedPositions = 0;")
.putVariable(completedPositionsVariable, 0);
//
// for loop loop body
//
LabelNode done = new LabelNode("done");
ForLoopBuilder forLoop =
ForLoop.forLoopBuilder(compilerContext)
.initialize(NOP)
.condition(
new Block(compilerContext)
.comment("completedPositions < 16384")
.getVariable(completedPositionsVariable)
.push(16384)
.invokeStatic(
CompilerOperations.class, "lessThan", boolean.class, int.class, int.class))
.update(
new Block(compilerContext)
.comment("completedPositions++")
.incrementVariable(completedPositionsVariable, (byte) 1));
Block forLoopBody = new Block(compilerContext);
forLoop.body(forLoopBody);
forLoopBody
.comment("if (pageBuilder.isFull()) break;")
.append(
new Block(compilerContext)
.getVariable("pageBuilder")
.invokeVirtual(PageBuilder.class, "isFull", boolean.class)
.ifTrueGoto(done));
forLoopBody
.comment("if (!cursor.advanceNextPosition()) break;")
.append(
new Block(compilerContext)
.getVariable("cursor")
.invokeInterface(RecordCursor.class, "advanceNextPosition", boolean.class)
.ifFalseGoto(done));
// if (filter(cursor))
IfStatementBuilder ifStatement = new IfStatementBuilder(compilerContext);
ifStatement.condition(
new Block(compilerContext)
.pushThis()
.getVariable("cursor")
.invokeVirtual(
classDefinition.getType(),
"filter",
type(boolean.class),
type(RecordCursor.class)));
Block trueBlock = new Block(compilerContext);
ifStatement.ifTrue(trueBlock);
if (projections.isEmpty()) {
// pageBuilder.declarePosition();
trueBlock
.getVariable("pageBuilder")
.invokeVirtual(PageBuilder.class, "declarePosition", void.class);
} else {
// project_43(block..., pageBuilder.getBlockBuilder(42)));
for (int projectionIndex = 0; projectionIndex < projections.size(); projectionIndex++) {
trueBlock.pushThis();
trueBlock.getVariable("cursor");
// pageBuilder.getBlockBuilder(0)
trueBlock
.getVariable("pageBuilder")
.push(projectionIndex)
.invokeVirtual(PageBuilder.class, "getBlockBuilder", BlockBuilder.class, int.class);
// project(block..., blockBuilder)
trueBlock.invokeVirtual(
classDefinition.getType(),
"project_" + projectionIndex,
type(void.class),
type(RecordCursor.class),
type(BlockBuilder.class));
}
}
forLoopBody.append(ifStatement.build());
filterAndProjectMethod
.getBody()
.append(forLoop.build())
.visitLabel(done)
.comment("return completedPositions;")
.getVariable("completedPositions")
.retInt();
}
