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package org.checkerframework.common.wholeprograminference;
import com.sun.source.tree.ClassTree;
import com.sun.source.tree.MethodTree;
import com.sun.source.tree.Tree;
import com.sun.tools.javac.code.Symbol.ClassSymbol;
import java.util.Map;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.VariableElement;
import org.checkerframework.common.basetype.BaseTypeChecker;
import org.checkerframework.dataflow.analysis.Analysis;
import org.checkerframework.dataflow.cfg.node.LocalVariableNode;
import org.checkerframework.dataflow.cfg.node.MethodInvocationNode;
import org.checkerframework.dataflow.cfg.node.Node;
import org.checkerframework.dataflow.cfg.node.ObjectCreationNode;
import org.checkerframework.dataflow.cfg.node.ReturnNode;
import org.checkerframework.framework.flow.CFAbstractStore;
import org.checkerframework.framework.qual.IgnoreInWholeProgramInference;
import org.checkerframework.framework.type.AnnotatedTypeMirror;
import org.checkerframework.framework.type.AnnotatedTypeMirror.AnnotatedDeclaredType;
import org.checkerframework.framework.type.AnnotatedTypeMirror.AnnotatedExecutableType;
/**
* Interface for recording facts at (pseudo-)assignments. It is used by the -Ainfer command-line
* argument. The -Ainfer command-line argument is used by the whole-program-inference loop, but this
* class does not implement that loop and its name {@code WholeProgramInference} is misleading.
*
* This interface has update* methods that should be called at certain (pseudo-)assignments, and
* they may update the type of the LHS of the (pseudo-)assignment based on the type of the RHS. In
* case the element on the LHS already had an inferred type, its new type will be the LUB between
* the previous and new types.
*
* @checker_framework.manual #whole-program-inference Whole-program inference
*/
public interface WholeProgramInference {
/**
* Updates the parameter types of the constructor {@code constructorElt} based on the arguments in
* {@code objectCreationNode}.
*
*
For each parameter in constructorElt:
*
*
* - If there is no stored annotated type for that parameter, then use the type of the
* corresponding argument in the object creation call objectCreationNode.
*
- If there was a stored annotated type for that parameter, then its new type will be the
* LUB between the previous type and the type of the corresponding argument in the object
* creation call.
*
*
* @param objectCreationNode the Node that invokes the constructor
* @param constructorElt the Element of the constructor
* @param store the store just before the call
*/
void updateFromObjectCreation(
ObjectCreationNode objectCreationNode,
ExecutableElement constructorElt,
CFAbstractStore store);
/**
* Updates the parameter types of the method {@code methodElt} based on the arguments in the
* method invocation {@code methodInvNode}.
*
* For each formal parameter in methodElt (including the receiver):
*
*
* - If there is no stored annotated type for that parameter, then use the type of the
* corresponding argument in the method call methodInvNode.
*
- If there was a stored annotated type for that parameter, then its new type will be the
* LUB between the previous type and the type of the corresponding argument in the method
* call.
*
*
* @param methodInvNode the node representing a method invocation
* @param methodElt the element of the method being invoked
* @param store the store before the method call, used for inferring method preconditions
*/
void updateFromMethodInvocation(
MethodInvocationNode methodInvNode, ExecutableElement methodElt, CFAbstractStore store);
/**
* Updates the parameter types (including the receiver) of the method {@code methodTree} based on
* the parameter types of the overridden method {@code overriddenMethod}.
*
* For each formal parameter in methodElt:
*
*
* - If there is no stored annotated type for that parameter, then use the type of the
* corresponding parameter on the overridden method.
*
- If there is a stored annotated type for that parameter, then its new type will be the LUB
* between the previous type and the type of the corresponding parameter on the overridden
* method.
*
*
* @param methodTree the tree of the method that contains the parameter(s)
* @param methodElt the element of the method
* @param overriddenMethod the AnnotatedExecutableType of the overridden method
*/
void updateFromOverride(
MethodTree methodTree, ExecutableElement methodElt, AnnotatedExecutableType overriddenMethod);
/**
* Updates the type of {@code lhs} based on an assignment of {@code rhs} to {@code lhs}.
*
*
* - If there is no stored annotated type for lhs, then use the type of the corresponding
* argument in the method call methodInvNode.
*
- If there is a stored annotated type for lhs, then its new type will be the LUB between
* the previous type and the type of the corresponding argument in the method call.
*
*
* @param lhs the node representing the formal parameter
* @param rhs the node being assigned to the parameter in the method body
* @param paramElt the formal parameter
*/
void updateFromFormalParameterAssignment(
LocalVariableNode lhs, Node rhs, VariableElement paramElt);
/**
* Updates the type of {@code field} based on an assignment of {@code rhs} to {@code field}. If
* the field has a declaration annotation with the {@link IgnoreInWholeProgramInference}
* meta-annotation, no type annotation will be inferred for that field.
*
* If there is no stored entry for the field lhs, the entry will be created and its type will
* be the type of rhs. If there is a stored entry/type for lhs, its new type will be the LUB
* between the previous type and the type of rhs.
*
* @param field the field whose type will be refined. Must be either a FieldAccessNode or a
* LocalVariableNode whose element kind is FIELD.
* @param rhs the expression being assigned to the field
*/
void updateFromFieldAssignment(Node field, Node rhs);
/**
* Updates the type of {@code field} based on an assignment whose right-hand side has type {@code
* rhsATM}. See more details at {@link #updateFromFieldAssignment}.
*
* @param lhsTree the tree for the field whose type will be refined
* @param element the element for the field whose type will be refined
* @param fieldName the name of the field whose type will be refined
* @param rhsATM the type of the expression being assigned to the field
*/
void updateFieldFromType(
Tree lhsTree, Element element, String fieldName, AnnotatedTypeMirror rhsATM);
/**
* Updates the return type of the method {@code methodTree} based on {@code returnedExpression}.
* Also updates the return types of any methods that this method overrides that are available as
* source code.
*
*
If there is no stored annotated return type for the method methodTree, then the type of the
* return expression will be added to the return type of that method. If there is a stored
* annotated return type for the method methodTree, its new type will be the LUB between the
* previous type and the type of the return expression.
*
* @param retNode the node that contains the expression returned
* @param classSymbol the symbol of the class that contains the method
* @param methodTree the tree of the method whose return type may be updated
* @param overriddenMethods the methods that the given method return overrides, indexed by the
* annotated type of the superclass in which each method is defined
*/
void updateFromReturn(
ReturnNode retNode,
ClassSymbol classSymbol,
MethodTree methodTree,
Map overriddenMethods);
/**
* Updates the preconditions or postconditions of the current method, from a store.
*
* @param methodElement the method or constructor whose preconditions or postconditions to update
* @param preOrPost whether to update preconditions or postconditions
* @param store the store at the method's entry or normal exit, for reading types of expressions
*/
void updateContracts(
Analysis.BeforeOrAfter preOrPost,
ExecutableElement methodElement,
CFAbstractStore store);
/**
* Updates a method to add a declaration annotation.
*
* @param methodElt the method to annotate
* @param anno the declaration annotation to add to the method
*/
void addMethodDeclarationAnnotation(ExecutableElement methodElt, AnnotationMirror anno);
/**
* Updates a field to add a declaration annotation.
*
* @param fieldElt the field to annotate
* @param anno the declaration annotation to add to the field
*/
void addFieldDeclarationAnnotation(Element fieldElt, AnnotationMirror anno);
/**
* Writes the inferred results to a file. Ideally, it should be called at the end of the
* type-checking process. In practice, it is called after each class, because we don't know which
* class will be the last one in the type-checking process.
*
* @param format the file format in which to write the results
* @param checker the checker from which this method is called, for naming stub files
*/
void writeResultsToFile(OutputFormat format, BaseTypeChecker checker);
/**
* Performs any preparation required for inference on Elements of a class. Should be called on
* each toplevel class declaration in a compilation unit before processing it.
*
* @param classTree the class to preprocess
*/
void preprocessClassTree(ClassTree classTree);
/** The kinds of output that whole-program inference can produce. */
enum OutputFormat {
/**
* Output the results of whole-program inference as a stub file that can be parsed back into the
* Checker Framework by the Stub Parser.
*/
STUB(),
/**
* Output the results of whole-program inference as a Java annotation index file. The Annotation
* File Utilities project contains code for reading and writing .jaif files.
*/
JAIF(),
/**
* Output the results of whole-program inference as an ajava file that can be read in using the
* -Aajava option.
*/
AJAVA(),
}
}