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package org.graalvm.graphio;

import java.net.URI;
import java.net.URISyntaxException;


Provides source location information about compiled code. This interface is an extension of GraphElements - by default the elements work with classical StackTraceElement. Should the default behavior not be sufficient, feel free to implement the additional operations available in this interface and register your implementation when 
building the GraphOutput instance. 
Type parameters:
  • <M> – type representing methods
  • <P> – type representing source code location
  • <L> – represeting stack element location
Since:0.33 part of GraalVM 0.33
/**
 * Provides source location information about compiled code. This interface is an extension of
 * {@link GraphElements} - by default the elements work with classical {@link StackTraceElement}.
 * Should the default behavior not be sufficient, feel free to implement the additional operations
 * available in this interface and register your implementation when {@link GraphOutput.Builder
 * building} the {@link GraphOutput} instance.
 *
 * @param <M> type representing methods
 * @param <P> type representing source code location
 * @param <L> represeting {@link StackTraceElement stack element} location
 *
 * @since 0.33 part of GraalVM 0.33
 */
public interface GraphLocations<M, P, L> {
    
Stack trace element for a method, index and position. Returns all applicable source locations for given code position. Each provided location is expected to represent location in a different language. 
Params:
  • method – the method
  • bci – the index
  • pos – the position
Returns:elements representing location for all language strata
/**
     * Stack trace element for a method, index and position. Returns all applicable source locations
     * for given code position. Each provided location is expected to represent location in a
     * different {@link #locationLanguage(java.lang.Object) language}.
     *
     * @param method the method
     * @param bci the index
     * @param pos the position
     * @return elements representing location for all language strata
     */
    Iterable<L> methodLocation(M method, int bci, P pos);

    
Identification of the language. Each location can point to a source in a different language -
e.g. each location can have multiple strata.

Params:
  • location – the location
Returns:id of the language/strata
/**
     * Identification of the language. Each location can point to a source in a different language -
     * e.g. each location can have multiple <em>strata</em>.
     *
     * @param location the location
     * @return id of the language/strata
     */
    String locationLanguage(L location);

    
The universal resource identification that contains the location.If the location can be found in an assummably accessible resource, then use such resource identification. It is up to the side processing the URI to load the content from the location. Protocols scheme file, http, or https are assumed to be accessible. 

If the location is inside of a virtual source, or source which is unlikely to be accessible
outside of running program, then it may be better to encode the whole source into the
resource identifier. This can be done by using
data
URIs like:

data:text/javascript,alert('Vivat graphs!')



Params:
  • location – the location
Throws:
Returns:the file name for the given location or null if it is not known
/**
     * The universal resource identification that contains the location.If the location can be found
     * in an assummably accessible resource, then use such resource identification. It is up to the
     * side processing the URI to load the content from the location. Protocols scheme {@code file},
     * {@code http}, or {@code https} are assumed to be accessible.
     * <p>
     * If the location is inside of a virtual source, or source which is unlikely to be accessible
     * outside of running program, then it may be better to encode the whole source into the
     * resource identifier. This can be done by using
     * <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs">data
     * URIs</a> like:
     *
     * <pre>
     * data:text/javascript,alert('Vivat graphs!')
     * </pre>
     *
     * @param location the location
     * @return the file name for the given location or {@code null} if it is not known
     * @throws URISyntaxException yielding this exception aborts the graph dumping
     */
    URI locationURI(L location) throws URISyntaxException;

    
Line number of a location. The first line in the source file is one. Negative value means the line location isn't available. In such situation one can provide an offset driven location co-ordinates via locationOffsetStart(Object) and locationOffsetEnd(Object) methods. 
Params:
  • location – the location
Returns:the line number for given location, negative value means no line
/**
     * Line number of a location. The first line in the source file is one. Negative value means the
     * line location isn't available. In such situation one can provide an offset driven location
     * co-ordinates via {@link #locationOffsetStart(java.lang.Object)} and
     * {@link #locationOffsetEnd(java.lang.Object)} methods.
     *
     * @param location the location
     * @return the line number for given location, negative value means no line
     */
    int locationLineNumber(L location);

    
Offset of the location. In certain situations it is preferrable to specify offset rather than line number of a location in source. In such case return the start offset from this method and end offset via locationOffsetEnd(Object) method. Offsets are counted from 0. 
Params:
  • location – the location
Returns:the starting offset of the location, negative value means no offset
/**
     * Offset of the location. In certain situations it is preferrable to specify offset rather than
     * {@link #locationLineNumber(java.lang.Object) line number} of a location in source. In such
     * case return the start offset from this method and end offset via
     * {@link #locationOffsetEnd(java.lang.Object)} method. Offsets are counted from {@code 0}.
     *
     * @param location the location
     * @return the starting offset of the location, negative value means no offset
     */
    int locationOffsetStart(L location);

    
Offset of the location. In certain situations it is preferrable to specify offset rather than line number of a location in source. In such case return the start offset via locationOffsetStart(Object) method and end from this method. Offsets are counted from 0. 
Params:
  • location – the location
Returns:the end offset (exclusive) of the location, negative value means no offset
/**
     * Offset of the location. In certain situations it is preferrable to specify offset rather than
     * {@link #locationLineNumber(java.lang.Object) line number} of a location in source. In such
     * case return the start offset via {@link #locationOffsetStart(java.lang.Object)} method and
     * end from this method. Offsets are counted from {@code 0}.
     *
     * @param location the location
     * @return the end offset (exclusive) of the location, negative value means no offset
     */
    int locationOffsetEnd(L location);
}