Examples with BOOTSTRAP_METHOD io.trino.sql.gen.Bootstrap.BOOTSTRAP_METHOD used on opensource projects

Example 1 with BOOTSTRAP_METHOD

use of io.trino.sql.gen.Bootstrap.BOOTSTRAP_METHOD in project trino by trinodb.

the class AbstractGreatestLeast method generate.

private Class<?> generate(List<Class<?>> javaTypes, MethodHandle compareMethod) {
    Signature signature = getFunctionMetadata().getSignature();
    checkCondition(javaTypes.size() <= 127, NOT_SUPPORTED, "Too many arguments for function call %s()", signature.getName());
    String javaTypeName = javaTypes.stream().map(Class::getSimpleName).collect(joining());
    ClassDefinition definition = new ClassDefinition(a(PUBLIC, FINAL), makeClassName(javaTypeName + "$" + signature.getName()), type(Object.class));
    definition.declareDefaultConstructor(a(PRIVATE));
    List<Parameter> parameters = IntStream.range(0, javaTypes.size()).mapToObj(i -> arg("arg" + i, javaTypes.get(i))).collect(toImmutableList());
    MethodDefinition method = definition.declareMethod(a(PUBLIC, STATIC), signature.getName(), type(wrap(javaTypes.get(0))), parameters);
    Scope scope = method.getScope();
    BytecodeBlock body = method.getBody();
    CallSiteBinder binder = new CallSiteBinder();
    Variable value = scope.declareVariable(wrap(javaTypes.get(0)), "value");
    BytecodeExpression nullValue = constantNull(wrap(javaTypes.get(0)));
    body.append(value.set(nullValue));
    LabelNode done = new LabelNode("done");
    compareMethod = compareMethod.asType(methodType(boolean.class, compareMethod.type().wrap().parameterList()));
    for (int i = 0; i < javaTypes.size(); i++) {
        Parameter parameter = parameters.get(i);
        BytecodeExpression invokeCompare = invokeDynamic(BOOTSTRAP_METHOD, ImmutableList.of(binder.bind(compareMethod).getBindingId()), "compare", boolean.class, parameter, value);
        body.append(new IfStatement().condition(isNull(parameter)).ifTrue(new BytecodeBlock().append(value.set(nullValue)).gotoLabel(done)));
        body.append(new IfStatement().condition(or(isNull(value), invokeCompare)).ifTrue(value.set(parameter)));
    }
    body.visitLabel(done);
    body.append(value.ret());
    return defineClass(definition, Object.class, binder.getBindings(), new DynamicClassLoader(getClass().getClassLoader()));
}