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package com.oracle.truffle.api.debug;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.RootCallTarget;
import com.oracle.truffle.api.TruffleStackTraceElement;
import com.oracle.truffle.api.frame.Frame;
import com.oracle.truffle.api.frame.MaterializedFrame;
import com.oracle.truffle.api.interop.NodeLibrary;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
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 19.0
*/
public final class DebugStackTraceElement {
private final DebuggerSession session;
final TruffleStackTraceElement traceElement;
private final StackTraceElement hostTraceElement;
private StackTraceElement stackTraceElement;
DebugStackTraceElement(DebuggerSession session, TruffleStackTraceElement traceElement) {
this.session = session;
this.traceElement = traceElement;
this.hostTraceElement = null;
}
DebugStackTraceElement(DebuggerSession session, StackTraceElement hostTraceElement) {
this.session = session;
this.traceElement = null;
this.hostTraceElement = hostTraceElement;
}
/**
* 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 19.0
*/
public boolean isInternal() {
if (isHost()) {
return false;
}
RootNode root = findCurrentRoot();
if (root == null) {
return true;
}
return root.isInternal();
}
/**
* Returns true if this element is a host element. Host elements provide
* {@link #getHostTraceElement() stack trace element}, have no {@link #getScope() scope}, and no
* {@link #getSourceSection() source section}.
*
* Host elements are provided only when {@link DebuggerSession#setShowHostStackFrames(boolean)
* host info} is set to true.
*
* @since 20.3
* @see DebuggerSession#setShowHostStackFrames(boolean)
*/
public boolean isHost() {
return hostTraceElement != null;
}
/**
* Provides a host element. Returns the host stack trace element if and only if this is
* {@link #isHost() host} element.
*
* @return the host stack trace element, or null when not a host element.
* @since 20.3
* @see #isHost()
*/
public StackTraceElement getHostTraceElement() {
return hostTraceElement;
}
/**
* A description of the trace element. If the language does not provide such a description then
* null is returned.
*
* @since 19.0
*/
public String getName() {
if (hostTraceElement != null) {
return hostTraceElement.getClassName() + '.' + hostTraceElement.getMethodName();
}
RootNode root = findCurrentRoot();
if (root == null) {
return null;
}
try {
return root.getName();
} catch (ThreadDeath td) {
throw td;
} catch (Throwable ex) {
throw new DebugException(session, 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 19.0
*/
public SourceSection getSourceSection() {
if (isHost()) {
return null;
}
Node node = traceElement.getLocation();
if (node != null) {
return session.resolveSection(node);
}
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 19.0
*/
public DebugScope getScope() {
if (isHost()) {
return null;
}
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;
if (!NodeLibrary.getUncached().hasScope(node, frame)) {
return null;
}
try {
Object scope = NodeLibrary.getUncached().getScope(node, frame, true);
return new DebugScope(scope, session, null, node, frame, root);
} catch (UnsupportedMessageException e) {
throw CompilerDirectives.shouldNotReachHere(e);
}
}
private LanguageInfo getLanguage() {
if (isHost()) {
return null;
}
LanguageInfo language;
RootNode root = findCurrentRoot();
if (root != null) {
language = root.getLanguageInfo();
} else {
language = null;
}
return language;
}
private RootNode findCurrentRoot() {
if (isHost()) {
return null;
}
Node node = traceElement.getLocation();
if (node != null) {
return node.getRootNode();
}
RootCallTarget target = traceElement.getTarget();
return target.getRootNode();
}
StackTraceElement toTraceElement() {
if (stackTraceElement == null) {
if (hostTraceElement != null) {
stackTraceElement = hostTraceElement;
} else {
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;
stackTraceElement = new StackTraceElement(declaringClass, methodName, fileName, startLine);
}
}
return stackTraceElement;
}
}