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package com.oracle.truffle.api.debug;
import java.util.Iterator;
import com.oracle.truffle.api.RootCallTarget;
import com.oracle.truffle.api.Scope;
import com.oracle.truffle.api.TruffleStackTraceElement;
import com.oracle.truffle.api.debug.DebugValue.HeapValue;
import com.oracle.truffle.api.frame.Frame;
import com.oracle.truffle.api.frame.MaterializedFrame;
import com.oracle.truffle.api.nodes.LanguageInfo;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.source.SourceSection;
/**
* Represents a trace element in the guest language stack trace. A guest language trace element
* consists of a {@link #getName() name}, the current {@link #getSourceSection() source location}
* and {@link #getScope() scopes} containing local variables and arguments.
*
* The difference between this class and {@link DebugStackFrame} is the limited life-time of
* {@link DebugStackFrame}, that is associated with a {@link SuspendedEvent}.
*
* @see DebugException#getDebugStackTrace()
* @since 1.0
*/
public final class DebugStackTraceElement {
private final Debugger debugger;
final TruffleStackTraceElement traceElement;
private StackTraceElement stackTrace;
DebugStackTraceElement(Debugger debugger, TruffleStackTraceElement traceElement) {
this.debugger = debugger;
this.traceElement = traceElement;
}
/**
* Returns whether this trace element is a language implementation artifact.
*
* The decision to mark a method as internal is language-specific, reflects judgments
* about tool usability, and is subject to change.
*
* @since 1.0
*/
public boolean isInternal() {
RootNode root = findCurrentRoot();
if (root == null) {
return true;
}
return root.isInternal();
}
/**
* A description of the trace element. If the language does not provide such a description then
* null is returned.
*
* @since 1.0
*/
public String getName() {
RootNode root = findCurrentRoot();
if (root == null) {
return null;
}
try {
return root.getName();
} catch (ThreadDeath td) {
throw td;
} catch (Throwable ex) {
throw new DebugException(debugger, ex, root.getLanguageInfo(), null, true, null);
}
}
private String getName0() {
RootNode root = findCurrentRoot();
if (root == null) {
return null;
}
try {
return root.getName();
} catch (ThreadDeath td) {
throw td;
} catch (Throwable ex) {
return null;
}
}
/**
* Returns the source section location of this trace element. The source section is
* null if the source location is not available.
*
* @since 1.0
*/
public SourceSection getSourceSection() {
Node node = traceElement.getLocation();
if (node != null) {
return node.getEncapsulatingSourceSection();
}
return null;
}
/**
* Get the current inner-most scope. The scope might not provide valid information if the
* execution path diverges from this trace element.
*
* @return the scope, or null when no language is associated with this frame
* location, or when no local scope exists.
* @since 1.0
*/
public DebugScope getScope() {
Node node = traceElement.getLocation();
if (node == null) {
return null;
}
RootNode root = node.getRootNode();
if (root.getLanguageInfo() == null) {
// no language, no scopes
return null;
}
Frame elementFrame = traceElement.getFrame();
MaterializedFrame frame = (elementFrame != null) ? elementFrame.materialize() : null;
Iterable scopes = debugger.getEnv().findLocalScopes(node, frame);
Iterator it = scopes.iterator();
if (!it.hasNext()) {
return null;
}
return new DebugScope(it.next(), it, debugger, null, frame, root);
}
DebugValue wrapHeapValue(Object result) {
LanguageInfo language = getLanguage();
return new HeapValue(debugger, language, null, result);
}
LanguageInfo getLanguage() {
LanguageInfo language;
RootNode root = findCurrentRoot();
if (root != null) {
language = root.getLanguageInfo();
} else {
language = null;
}
return language;
}
RootNode findCurrentRoot() {
Node node = traceElement.getLocation();
if (node != null) {
return node.getRootNode();
}
RootCallTarget target = traceElement.getTarget();
return target.getRootNode();
}
StackTraceElement toTraceElement() {
if (stackTrace == null) {
LanguageInfo language = getLanguage();
String declaringClass = language != null ? "<" + language.getId() + ">" : "";
String methodName = getName0();
if (methodName == null) {
methodName = "";
}
SourceSection sourceLocation = getSourceSection();
String fileName = sourceLocation != null ? sourceLocation.getSource().getName() : "Unknown";
int startLine = sourceLocation != null ? sourceLocation.getStartLine() : -1;
stackTrace = new StackTraceElement(declaringClass, methodName, fileName, startLine);
}
return stackTrace;
}
}