[checkerframework]

A bit of a shadow feature because the checker framework folks need to do some work on their side.
this update makes lombok generate a few checker framework annotations (if configured to do so)
which let the checker framework add warnings and errors for example if you misuse builders, or ignore
the return values of withers, etc.

49 files changed, 1330 insertions, 205 deletions

diff --git a/doc/changelog.markdown b/doc/changelog.markdown
index 07b1b0aa..d6464f15 100644
--- a/doc/changelog.markdown
+++ b/doc/changelog.markdown
@@ -8,6 +8,7 @@ Lombok Changelog
 * ENHANCEMENT: You can now configure the generated builder class name via the config system, using key `lombok.builder.className`. See the [Builder documentation](https://projectlombok.org/features/Builder) and [SuperBuilder documentation](https://projectlombok.org/features/experimental/SuperBuilder)
 * ENHANCEMENT: If you mix up eclipse's non-null support, such as `@NonNullByDefault`, with lombok's `@NonNull`, you get a bunch of warnings about dead code that are inappropriate. These warnings are now suppressed, thanks to a contribution from Till Brychcy! [Pull Request #2155](https://github.com/rzwitserloot/lombok/pull/2155)
 * ENHANCEMENT: `@NonNull` can now also generate checks using jdk's `Objects.requireNonNull` or Guava's `Preconditions.checkNotNull`. [Issue #1197](https://github.com/rzwitserloot/lombok/issues/1197)
+* EXPERIMENT: Lombok is working together with [checkerframework](https://checkerframework.org/) to enable detection of improper builder use (such as forgetting to set a mandatory property prior to calling `build()`). This experiment can be turned on by adding `checkerframework = true` to your `lombok.config` file.
 * BUGFIX: Delombok would turn something like `List<byte[]>...` in a method parameter to `List<byte...>...` [Issue #2140](https://github.com/rzwitserloot/lombok/issues/2140)
 * BUGFIX: Javac would generate the wrong equals and hashCode if a type-use annotation was put on an array type field [Issue #2165](https://github.com/rzwitserloot/lombok/issues/2165)
 * BUGFIX: Eclipse 2019-06 + JDK-12 compatibility + an `@Singular` builder entry would produce a cascade of error dialogs. [Issue #2169](https://github.com/rzwitserloot/lombok/issues/2169)
diff --git a/src/core/lombok/ConfigurationKeys.java b/src/core/lombok/ConfigurationKeys.java
index dda0b54b..d46889d6 100644
--- a/src/core/lombok/ConfigurationKeys.java
+++ b/src/core/lombok/ConfigurationKeys.java
@@ -24,6 +24,7 @@ package lombok;
 import java.util.List;
 
 import lombok.core.configuration.CallSuperType;
+import lombok.core.configuration.CheckerFrameworkVersion;
 import lombok.core.configuration.ConfigurationKey;
 import lombok.core.configuration.LogDeclaration;
 import lombok.core.configuration.FlagUsageType;
@@ -627,5 +628,14 @@ public class ConfigurationKeys {
 	 * Copy these annotations to getters, setters, withers, builder-setters, etc.
 	 */
 	public static final ConfigurationKey<List<TypeName>> COPYABLE_ANNOTATIONS = new ConfigurationKey<List<TypeName>>("lombok.copyableAnnotations", "Copy these annotations to getters, setters, withers, builder-setters, etc.") {};
+	
+	/**
+	 * lombok configuration: {@code checkerframework} = {@code true} | {@code false} | &lt;String: MajorVer.MinorVer&gt; (Default: false).
+	 * 
+	 * If set, lombok will generate appropriate annotations from checkerframework.org on generated code. If set to {@code true}, all relevant annotations from the most recent version of
+	 * checkerframework.org that lombok supports will be generated. If set to a specific major/minor version number, only checkerframework annotations introduced on or before the stated
+	 * checkerframework.org version will be generated.
+	 */
+	public static final ConfigurationKey<CheckerFrameworkVersion> CHECKER_FRAMEWORK = new ConfigurationKey<CheckerFrameworkVersion>("checkerframework", "If set with the version of checkerframework.org (in major.minor, or just 'true' for the latest supported version), create relevant checkerframework.org annotations for code lombok generates (default: false).") {};
 
 }
diff --git a/src/core/lombok/core/configuration/CheckerFrameworkVersion.java b/src/core/lombok/core/configuration/CheckerFrameworkVersion.java
new file mode 100644
index 00000000..68fc05a7
--- /dev/null
+++ b/src/core/lombok/core/configuration/CheckerFrameworkVersion.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2019 The Project Lombok Authors.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package lombok.core.configuration;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public final class CheckerFrameworkVersion implements ConfigurationValueType {
+	private final int version;
+	private static final int MAX_SUPPORTED = 3000;
+	
+	public static final String NAME__SIDE_EFFECT_FREE = "org.checkerframework.dataflow.qual.SideEffectFree";
+	public static final String NAME__UNIQUE = "org.checkerframework.common.aliasing.qual.Unique";
+	public static final String NAME__RETURNS_RECEIVER = "org.checkerframework.checker.builder.qual.ReturnsReceiver";
+	public static final String NAME__NOT_CALLED = "org.checkerframework.checker.builder.qual.NotCalledMethods";
+	public static final String NAME__CALLED = "org.checkerframework.checker.builder.qual.CalledMethods";
+	
+	public static final CheckerFrameworkVersion NONE = new CheckerFrameworkVersion(0);
+	
+	private CheckerFrameworkVersion(int v) {
+		this.version = v;
+	}
+	
+	private static final Pattern VERSION = Pattern.compile("^(\\d+)(?:\\.(\\d+))?(?:\\.\\d+)*$");
+	
+	public boolean generateSideEffectFree() {
+		return version > 0;
+	}
+	
+	public boolean generateUnique() {
+		return version > 0;
+	}
+	
+	public boolean generateReturnsReceiver() {
+		return version > 2999;
+	}
+	
+	public boolean generateCalledMethods() {
+		return version > 2999;
+	}
+	
+	public static CheckerFrameworkVersion valueOf(String versionString) {
+		if (versionString != null) versionString = versionString.trim();
+		if (versionString == null || versionString.equalsIgnoreCase("false") || versionString.equals("0")) return new CheckerFrameworkVersion(0);
+		if (versionString.equalsIgnoreCase("true")) return new CheckerFrameworkVersion(MAX_SUPPORTED);
+		Matcher m = VERSION.matcher(versionString);
+		if (!m.matches()) throw new IllegalArgumentException("Expected 'true' or 'false' or a major/minor version, such as '2.9'");
+		int major = Integer.parseInt(m.group(1));
+		int minor = (m.group(2) != null && !m.group(2).isEmpty()) ? Integer.parseInt(m.group(2)) : 0;
+		if (minor > 999) throw new IllegalArgumentException("Minor version must be between 0 and 999");
+		int v = major * 1000 + minor;
+		if (v > MAX_SUPPORTED) {
+			String s = (v / 1000) + "." + (v % 1000);
+			throw new IllegalArgumentException("Lombok supports at most v" + s + "; reduce the value of key 'checkerframework' to " + s);
+		}
+		return new CheckerFrameworkVersion(v);
+	}
+	
+	public static String description() {
+		return "checkerframework-version";
+	}
+	
+	public static String exampleValue() {
+		String s = (MAX_SUPPORTED / 1000) + "." + (MAX_SUPPORTED % 1000);
+		return "major.minor (example: 2.9 - and no higher than " + s + ") or true or false";
+	}
+}
diff --git a/src/core/lombok/eclipse/handlers/EclipseHandlerUtil.java b/src/core/lombok/eclipse/handlers/EclipseHandlerUtil.java
index 11a2b9bd..782c6a29 100644
--- a/src/core/lombok/eclipse/handlers/EclipseHandlerUtil.java
+++ b/src/core/lombok/eclipse/handlers/EclipseHandlerUtil.java
@@ -111,6 +111,7 @@ import lombok.core.AnnotationValues;
 import lombok.core.AnnotationValues.AnnotationValue;
 import lombok.core.LombokImmutableList;
 import lombok.core.TypeResolver;
+import lombok.core.configuration.CheckerFrameworkVersion;
 import lombok.core.configuration.NullCheckExceptionType;
 import lombok.core.configuration.TypeName;
 import lombok.core.debug.ProblemReporter;
@@ -184,6 +185,23 @@ public class EclipseHandlerUtil {
 		return ma;
 	}
 	
+	public static MarkerAnnotation generateNamedAnnotation(ASTNode source, String typeName) {
+		char[][] cc = fromQualifiedName(typeName);
+		QualifiedTypeReference qtr = new QualifiedTypeReference(cc, poss(source, cc.length));
+		setGeneratedBy(qtr, source);
+		MarkerAnnotation ma = new MarkerAnnotation(qtr, source.sourceStart);
+		// No matter what value you input for sourceEnd, the AST->DOM converter of eclipse will reparse to find the end, and will fail as
+		// it can't find code that isn't really there. This results in the end position being set to 2 or 0 or some weird magic value, and thus,
+		// length, as calculated by end-start, is all screwed up, resulting in IllegalArgumentException during a setSourceRange call MUCH later in the process.
+		// We solve it by going with a voodoo magic source start value such that the calculated length so happens to exactly be 0. 0 lengths are accepted
+		// by eclipse. For some reason.
+		// TL;DR: Don't change 1. 1 is sacred. Trust the 1.
+		// issue: #408.
+		ma.sourceStart = 1;
+		setGeneratedBy(ma, source);
+		return ma;
+	}
+	
 	public static boolean isFieldDeprecated(EclipseNode fieldNode) {
 		if (!(fieldNode.get() instanceof FieldDeclaration)) return false;
 		FieldDeclaration field = (FieldDeclaration) fieldNode.get();
@@ -199,6 +217,11 @@ public class EclipseHandlerUtil {
 		return false;
 	}
 	
+	public static CheckerFrameworkVersion getCheckerFrameworkVersion(EclipseNode node) {
+		CheckerFrameworkVersion cfv = node.getAst().readConfiguration(ConfigurationKeys.CHECKER_FRAMEWORK);
+		return cfv != null ? cfv : CheckerFrameworkVersion.NONE;
+	}
+	
 	/**
 	 * Checks if the given TypeReference node is likely to be a reference to the provided class.
 	 * 
@@ -1908,11 +1931,13 @@ public class EclipseHandlerUtil {
 	 * Create an annotation of the given name, and is marked as being generated by the given source.
 	 */
 	public static MarkerAnnotation makeMarkerAnnotation(char[][] name, ASTNode source) {
-		long pos = (long)source.sourceStart << 32 | source.sourceEnd;
-		TypeReference typeRef = new QualifiedTypeReference(name, new long[] {pos, pos, pos});
+		long pos = (long) source.sourceStart << 32 | source.sourceEnd;
+		long[] poss = new long[name.length];
+		Arrays.fill(poss, pos);
+		TypeReference typeRef = new QualifiedTypeReference(name, poss);
 		setGeneratedBy(typeRef, source);
-		MarkerAnnotation ann = new MarkerAnnotation(typeRef, (int)(pos >> 32));
-		ann.declarationSourceEnd = ann.sourceEnd = ann.statementEnd = (int)pos;
+		MarkerAnnotation ann = new MarkerAnnotation(typeRef, (int) (pos >> 32));
+		ann.declarationSourceEnd = ann.sourceEnd = ann.statementEnd = (int) pos;
 		setGeneratedBy(ann, source);
 		return ann;
 	}
diff --git a/src/core/lombok/eclipse/handlers/EclipseSingularsRecipes.java b/src/core/lombok/eclipse/handlers/EclipseSingularsRecipes.java
index a8a780d6..da0bf471 100755
--- a/src/core/lombok/eclipse/handlers/EclipseSingularsRecipes.java
+++ b/src/core/lombok/eclipse/handlers/EclipseSingularsRecipes.java
@@ -33,6 +33,7 @@ import java.util.Map;
 
 import org.eclipse.jdt.internal.compiler.ast.ASTNode;
 import org.eclipse.jdt.internal.compiler.ast.AbstractMethodDeclaration;
+import org.eclipse.jdt.internal.compiler.ast.Annotation;
 import org.eclipse.jdt.internal.compiler.ast.ConditionalExpression;
 import org.eclipse.jdt.internal.compiler.ast.EqualExpression;
 import org.eclipse.jdt.internal.compiler.ast.Expression;
@@ -62,6 +63,7 @@ import lombok.AccessLevel;
 import lombok.core.LombokImmutableList;
 import lombok.core.SpiLoadUtil;
 import lombok.core.TypeLibrary;
+import lombok.core.configuration.CheckerFrameworkVersion;
 import lombok.eclipse.EclipseNode;
 
 public class EclipseSingularsRecipes {
@@ -235,7 +237,7 @@ public class EclipseSingularsRecipes {
 		 * If you need more control over the return type and value, use
 		 * {@link #generateMethods(SingularData, boolean, EclipseNode, boolean, TypeReferenceMaker, StatementMaker)}.
 		 */
-		public void generateMethods(SingularData data, boolean deprecate, final EclipseNode builderType, boolean fluent, final boolean chain, AccessLevel access) {
+		public void generateMethods(CheckerFrameworkVersion cfv, SingularData data, boolean deprecate, final EclipseNode builderType, boolean fluent, final boolean chain, AccessLevel access) {
 			TypeReferenceMaker returnTypeMaker = new TypeReferenceMaker() {
 				@Override public TypeReference make() {
 					return chain ? cloneSelfType(builderType) : TypeReference.baseTypeReference(TypeIds.T_void, 0);
@@ -248,14 +250,14 @@ public class EclipseSingularsRecipes {
 				}
 			};
 			
-			generateMethods(data, deprecate, builderType, fluent, returnTypeMaker, returnStatementMaker, access);
+			generateMethods(cfv, data, deprecate, builderType, fluent, returnTypeMaker, returnStatementMaker, access);
 		}
 		
 		/**
 		 * Generates the singular, plural, and clear methods for the given {@link SingularData}.
 		 * Uses the given {@code returnTypeMaker} and {@code returnStatementMaker} for the generated methods.
 		 */
-		public abstract void generateMethods(SingularData data, boolean deprecate, EclipseNode builderType, boolean fluent, TypeReferenceMaker returnTypeMaker, StatementMaker returnStatementMaker, AccessLevel access);
+		public abstract void generateMethods(CheckerFrameworkVersion cfv, SingularData data, boolean deprecate, EclipseNode builderType, boolean fluent, TypeReferenceMaker returnTypeMaker, StatementMaker returnStatementMaker, AccessLevel access);
 		
 		public abstract void appendBuildCode(SingularData data, EclipseNode builderType, List<Statement> statements, char[] targetVariableName, String builderVariable);
 		
@@ -272,6 +274,15 @@ public class EclipseSingularsRecipes {
 		
 		// -- Utility methods --
 		
+		protected Annotation[] generateSelfReturnAnnotations(boolean deprecate, CheckerFrameworkVersion cfv, ASTNode source) {
+			Annotation deprecated = deprecate ? generateDeprecatedAnnotation(source) : null;
+			Annotation returnsReceiver = cfv.generateReturnsReceiver() ? generateNamedAnnotation(source, CheckerFrameworkVersion.NAME__RETURNS_RECEIVER) : null;
+			if (deprecated == null && returnsReceiver == null) return null;
+			if (deprecated == null) return new Annotation[] {returnsReceiver};
+			if (returnsReceiver == null) return new Annotation[] {deprecated};
+			return new Annotation[] {deprecated, returnsReceiver};
+		}
+		
 		/**
 		 * Adds the requested number of type arguments to the provided type, copying each argument in {@code typeArgs}. If typeArgs is too long, the extra elements are ignored.
 		 * If {@code typeArgs} is null or too short, {@code java.lang.Object} will be substituted for each missing type argument.
diff --git a/src/core/lombok/eclipse/handlers/HandleBuilder.java b/src/core/lombok/eclipse/handlers/HandleBuilder.java
index d2b1b823..8bfdeb65 100755
--- a/src/core/lombok/eclipse/handlers/HandleBuilder.java
+++ b/src/core/lombok/eclipse/handlers/HandleBuilder.java
@@ -37,6 +37,7 @@ import org.eclipse.jdt.internal.compiler.ast.AbstractVariableDeclaration;
 import org.eclipse.jdt.internal.compiler.ast.AllocationExpression;
 import org.eclipse.jdt.internal.compiler.ast.Annotation;
 import org.eclipse.jdt.internal.compiler.ast.Argument;
+import org.eclipse.jdt.internal.compiler.ast.ArrayInitializer;
 import org.eclipse.jdt.internal.compiler.ast.Assignment;
 import org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration;
 import org.eclipse.jdt.internal.compiler.ast.ConditionalExpression;
@@ -57,9 +58,11 @@ import org.eclipse.jdt.internal.compiler.ast.ParameterizedSingleTypeReference;
 import org.eclipse.jdt.internal.compiler.ast.QualifiedThisReference;
 import org.eclipse.jdt.internal.compiler.ast.QualifiedTypeReference;
 import org.eclipse.jdt.internal.compiler.ast.ReturnStatement;
+import org.eclipse.jdt.internal.compiler.ast.SingleMemberAnnotation;
 import org.eclipse.jdt.internal.compiler.ast.SingleNameReference;
 import org.eclipse.jdt.internal.compiler.ast.SingleTypeReference;
 import org.eclipse.jdt.internal.compiler.ast.Statement;
+import org.eclipse.jdt.internal.compiler.ast.StringLiteral;
 import org.eclipse.jdt.internal.compiler.ast.ThisReference;
 import org.eclipse.jdt.internal.compiler.ast.TrueLiteral;
 import org.eclipse.jdt.internal.compiler.ast.TypeDeclaration;
@@ -84,6 +87,7 @@ import lombok.core.handlers.HandlerUtil;
 import lombok.core.handlers.InclusionExclusionUtils.Included;
 import lombok.core.AnnotationValues;
 import lombok.core.HandlerPriority;
+import lombok.core.configuration.CheckerFrameworkVersion;
 import lombok.eclipse.Eclipse;
 import lombok.eclipse.EclipseAnnotationHandler;
 import lombok.eclipse.EclipseNode;
@@ -155,7 +159,8 @@ public class HandleBuilder extends EclipseAnnotationHandler<Builder> {
 	
 	@Override public void handle(AnnotationValues<Builder> annotation, Annotation ast, EclipseNode annotationNode) {
 		handleFlagUsage(annotationNode, ConfigurationKeys.BUILDER_FLAG_USAGE, "@Builder");
-
+		CheckerFrameworkVersion cfv = getCheckerFrameworkVersion(annotationNode);
+		
 		long p = (long) ast.sourceStart << 32 | ast.sourceEnd;
 		
 		Builder builderInstance = annotation.getInstance();
@@ -487,14 +492,14 @@ public class HandleBuilder extends EclipseAnnotationHandler<Builder> {
 		}
 		
 		for (BuilderFieldData bfd : builderFields) {
-			makeSetterMethodsForBuilder(builderType, bfd, annotationNode, fluent, chain, accessForInners, bfd.originalFieldNode);
+			makeSetterMethodsForBuilder(cfv, builderType, bfd, annotationNode, fluent, chain, accessForInners, bfd.originalFieldNode);
 		}
 		
 		{
 			MemberExistsResult methodExists = methodExists(buildMethodName, builderType, -1);
 			if (methodExists == MemberExistsResult.EXISTS_BY_LOMBOK) methodExists = methodExists(buildMethodName, builderType, 0);
 			if (methodExists == MemberExistsResult.NOT_EXISTS) {
-				MethodDeclaration md = generateBuildMethod(tdParent, isStatic, buildMethodName, nameOfStaticBuilderMethod, returnType, builderFields, builderType, thrownExceptions, addCleaning, ast, accessForInners);
+				MethodDeclaration md = generateBuildMethod(cfv, tdParent, isStatic, buildMethodName, nameOfStaticBuilderMethod, returnType, builderFields, builderType, thrownExceptions, addCleaning, ast, accessForInners);
 				if (md != null) injectMethod(builderType, md);
 			}
 		}
@@ -517,7 +522,7 @@ public class HandleBuilder extends EclipseAnnotationHandler<Builder> {
 		
 		if (generateBuilderMethod && methodExists(builderMethodName, tdParent, -1) != MemberExistsResult.NOT_EXISTS) generateBuilderMethod = false;
 		if (generateBuilderMethod) {
-			MethodDeclaration md = generateBuilderMethod(isStatic, builderMethodName, builderClassName, tdParent, typeParams, ast, accessForOuters);
+			MethodDeclaration md = generateBuilderMethod(cfv, isStatic, builderMethodName, builderClassName, tdParent, typeParams, ast, accessForOuters);
 			if (md != null) injectMethod(tdParent, md);
 		}
 		
@@ -534,7 +539,7 @@ public class HandleBuilder extends EclipseAnnotationHandler<Builder> {
 					tps[i].name = typeArgsForToBuilder.get(i);
 				}
 			}
-			MethodDeclaration md = generateToBuilderMethod(toBuilderMethodName, builderClassName, tdParent, tps, builderFields, fluent, ast, accessForOuters);
+			MethodDeclaration md = generateToBuilderMethod(cfv, toBuilderMethodName, builderClassName, tdParent, tps, builderFields, fluent, ast, accessForOuters);
 			
 			if (md != null) injectMethod(tdParent, md);
 		}
@@ -547,7 +552,7 @@ public class HandleBuilder extends EclipseAnnotationHandler<Builder> {
 	}
 	
 	private static final char[] BUILDER_TEMP_VAR = {'b', 'u', 'i', 'l', 'd', 'e', 'r'};
-	private MethodDeclaration generateToBuilderMethod(String methodName, String builderClassName, EclipseNode type, TypeParameter[] typeParams, List<BuilderFieldData> builderFields, boolean fluent, ASTNode source, AccessLevel access) {
+	private MethodDeclaration generateToBuilderMethod(CheckerFrameworkVersion cfv, String methodName, String builderClassName, EclipseNode type, TypeParameter[] typeParams, List<BuilderFieldData> builderFields, boolean fluent, ASTNode source, AccessLevel access) {
 		int pS = source.sourceStart, pE = source.sourceEnd;
 		long p = (long) pS << 32 | pE;
 		
@@ -623,6 +628,10 @@ public class HandleBuilder extends EclipseAnnotationHandler<Builder> {
 			out.statements = new Statement[] {new ReturnStatement(receiver, pS, pE)};
 		}
 		
+		if (cfv.generateUnique()) {
+			out.annotations = new Annotation[] {generateNamedAnnotation(source, CheckerFrameworkVersion.NAME__UNIQUE)};
+		}
+		
 		out.traverse(new SetGeneratedByVisitor(source), ((TypeDeclaration) type.get()).scope);
 		return out;
 
@@ -650,7 +659,35 @@ public class HandleBuilder extends EclipseAnnotationHandler<Builder> {
 		return decl;
 	}
 	
-	public MethodDeclaration generateBuildMethod(EclipseNode tdParent, boolean isStatic, String name, char[] staticName, TypeReference returnType, List<BuilderFieldData> builderFields, EclipseNode type, TypeReference[] thrownExceptions, boolean addCleaning, ASTNode source, AccessLevel access) {
+	static Argument[] generateBuildArgs(CheckerFrameworkVersion cfv, EclipseNode type, List<BuilderFieldData> builderFields, ASTNode source) {
+		if (!cfv.generateCalledMethods()) return null;
+		
+		List<char[]> mandatories = new ArrayList<char[]>();
+		for (BuilderFieldData bfd : builderFields) {
+			if (bfd.singularData == null && bfd.nameOfSetFlag == null) mandatories.add(bfd.name);
+		}
+		
+		if (mandatories.size() == 0) return null;
+		char[][] nameCalled = fromQualifiedName(CheckerFrameworkVersion.NAME__CALLED);
+		SingleMemberAnnotation ann = new SingleMemberAnnotation(new QualifiedTypeReference(nameCalled, poss(source, nameCalled.length)), source.sourceStart);
+		if (mandatories.size() == 1) {
+			ann.memberValue = new StringLiteral(mandatories.get(0), 0, 0, 0);
+		} else {
+			ArrayInitializer arr = new ArrayInitializer();
+			arr.sourceStart = source.sourceStart;
+			arr.sourceEnd = source.sourceEnd;
+			arr.expressions = new Expression[mandatories.size()];
+			for (int i = 0; i < arr.expressions.length; i++) {
+				arr.expressions[i] = new StringLiteral(mandatories.get(i), source.sourceStart, source.sourceEnd, 0);
+			}
+			ann.memberValue = arr;
+		}
+		Argument arg = new Argument(new char[] { 't', 'h', 'i', 's' }, 0, new SingleTypeReference(type.getName().toCharArray(), source.sourceStart), Modifier.FINAL);
+		arg.annotations = new Annotation[] {ann};
+		return new Argument[] {arg};
+	}
+	
+	public MethodDeclaration generateBuildMethod(CheckerFrameworkVersion cfv, EclipseNode tdParent, boolean isStatic, String name, char[] staticName, TypeReference returnType, List<BuilderFieldData> builderFields, EclipseNode type, TypeReference[] thrownExceptions, boolean addCleaning, ASTNode source, AccessLevel access) {
 		MethodDeclaration out = new MethodDeclaration(((CompilationUnitDeclaration) type.top().get()).compilationResult);
 		out.bits |= ECLIPSE_DO_NOT_TOUCH_FLAG;
 		List<Statement> statements = new ArrayList<Statement>();
@@ -723,6 +760,10 @@ public class HandleBuilder extends EclipseAnnotationHandler<Builder> {
 			}
 		}
 		out.statements = statements.isEmpty() ? null : statements.toArray(new Statement[0]);
+		if (cfv.generateSideEffectFree()) {
+			out.annotations = new Annotation[] {generateNamedAnnotation(source, CheckerFrameworkVersion.NAME__SIDE_EFFECT_FREE)};
+		}
+		out.arguments = generateBuildArgs(cfv, type, builderFields, source);
 		out.traverse(new SetGeneratedByVisitor(source), (ClassScope) null);
 		return out;
 	}
@@ -754,7 +795,7 @@ public class HandleBuilder extends EclipseAnnotationHandler<Builder> {
 		return out;
 	}
 	
-	public MethodDeclaration generateBuilderMethod(boolean isStatic, String builderMethodName, String builderClassName, EclipseNode type, TypeParameter[] typeParams, ASTNode source, AccessLevel access) {
+	public MethodDeclaration generateBuilderMethod(CheckerFrameworkVersion cfv, boolean isStatic, String builderMethodName, String builderClassName, EclipseNode type, TypeParameter[] typeParams, ASTNode source, AccessLevel access) {
 		int pS = source.sourceStart, pE = source.sourceEnd;
 		long p = (