feat: Add backtrace command

Author: Jan Krems

lib/node-inspect.js

@@ -465,6 +465,7 @@ function createCommandContext(inspector) {
 
   let currentSourceLocation = undefined;
   let currentFrame = undefined;
+  let currentBacktrace = undefined;
 
   const scripts = {};
   const watchedExpressions = [];
@@ -544,6 +545,16 @@ function createCommandContext(inspector) {
       return Debugger.pause();
     },
 
+    get backtrace() {
+      currentBacktrace.forEach((callFrame, idx) => {
+        const { location: { scriptId, lineNumber, columnNumber }, functionName } = callFrame;
+        const script = scripts[scriptId];
+        const relativeUrl = (script && getRelativePath(script && script.url)) || '<unknown>';
+        const name = functionName || '(anonymous)';
+        print(`#${idx} ${name} ${relativeUrl}:${lineNumber + 1}:${columnNumber}`);
+      });
+    },
+
     // List source code
     list(delta = 5) {
       const { scriptId, lineNumber, columnNumber } = currentSourceLocation;
@@ -619,6 +630,7 @@ function createCommandContext(inspector) {
 
   Debugger.on('paused', ({ callFrames, reason /* , hitBreakpoints */ }) => {
     // Save execution context's data
+    currentBacktrace = callFrames;
     const topFrame = callFrames[0];
     const { scriptId, lineNumber } = currentSourceLocation = topFrame.location;
     currentFrame = topFrame.callFrameId;