1 files changed, 162 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/actions/pause/mapFrames.js b/devtools/client/debugger/src/actions/pause/mapFrames.js
new file mode 100644
index 0000000000..1eb2a3fd50
--- /dev/null
+++ b/devtools/client/debugger/src/actions/pause/mapFrames.js
@@ -0,0 +1,162 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import {
+  getFrames,
+  getBlackBoxRanges,
+  getLocationSource,
+  getSelectedFrame,
+} from "../../selectors";
+
+import { isFrameBlackBoxed } from "../../utils/source";
+
+import assert from "../../utils/assert";
+
+import { isGeneratedId } from "devtools/client/shared/source-map-loader/index";
+
+function getSelectedFrameId(state, thread, frames) {
+  let selectedFrame = getSelectedFrame(state, thread);
+  const blackboxedRanges = getBlackBoxRanges(state);
+
+  if (
+    selectedFrame &&
+    !isFrameBlackBoxed(
+      selectedFrame,
+      getLocationSource(state, selectedFrame.location),
+      blackboxedRanges
+    )
+  ) {
+    return selectedFrame.id;
+  }
+
+  selectedFrame = frames.find(frame => {
+    const frameSource = getLocationSource(state, frame.location);
+    return !isFrameBlackBoxed(frame, frameSource, blackboxedRanges);
+  });
+  return selectedFrame?.id;
+}
+
+export function updateFrameLocation(frame, sourceMapLoader) {
+  if (frame.isOriginal) {
+    return Promise.resolve(frame);
+  }
+  return sourceMapLoader.getOriginalLocation(frame.location).then(loc => ({
+    ...frame,
+    location: loc,
+    generatedLocation: frame.generatedLocation || frame.location,
+  }));
+}
+
+function updateFrameLocations(frames, sourceMapLoader) {
+  if (!frames || !frames.length) {
+    return Promise.resolve(frames);
+  }
+
+  return Promise.all(
+    frames.map(frame => updateFrameLocation(frame, sourceMapLoader))
+  );
+}
+
+function isWasmOriginalSourceFrame(frame, getState) {
+  if (isGeneratedId(frame.location.sourceId)) {
+    return false;
+  }
+  const generatedSource = getLocationSource(
+    getState(),
+    frame.generatedLocation
+  );
+
+  return Boolean(generatedSource?.isWasm);
+}
+
+async function expandFrames(frames, sourceMapLoader, getState) {
+  const result = [];
+  for (let i = 0; i < frames.length; ++i) {
+    const frame = frames[i];
+    if (frame.isOriginal || !isWasmOriginalSourceFrame(frame, getState)) {
+      result.push(frame);
+      continue;
+    }
+    const originalFrames = await sourceMapLoader.getOriginalStackFrames(
+      frame.generatedLocation
+    );
+    if (!originalFrames) {
+      result.push(frame);
+      continue;
+    }
+
+    assert(!!originalFrames.length, "Expected at least one original frame");
+    // First entry has not specific location -- use one from original frame.
+    originalFrames[0] = {
+      ...originalFrames[0],
+      location: frame.location,
+    };
+
+    originalFrames.forEach((originalFrame, j) => {
+      if (!originalFrame.location) {
+        return;
+      }
+
+      // Keep outer most frame with true actor ID, and generate uniquie
+      // one for the nested frames.
+      const id = j == 0 ? frame.id : `${frame.id}-originalFrame${j}`;
+      result.push({
+        id,
+        displayName: originalFrame.displayName,
+        location: originalFrame.location,
+        index: frame.index,
+        source: null,
+        thread: frame.thread,
+        scope: frame.scope,
+        this: frame.this,
+        isOriginal: true,
+        // More fields that will be added by the mapDisplayNames and
+        // updateFrameLocation.
+        generatedLocation: frame.generatedLocation,
+        originalDisplayName: originalFrame.displayName,
+        originalVariables: originalFrame.variables,
+        asyncCause: frame.asyncCause,
+        state: frame.state,
+      });
+    });
+  }
+  return result;
+}
+
+/**
+ * Map call stack frame locations and display names to originals.
+ * e.g.
+ * 1. When the debuggee pauses
+ * 2. When a source is pretty printed
+ * 3. When symbols are loaded
+ * @memberof actions/pause
+ * @static
+ */
+export function mapFrames(cx) {
+  return async function(thunkArgs) {
+    const { dispatch, getState, sourceMapLoader } = thunkArgs;
+    const frames = getFrames(getState(), cx.thread);
+    if (!frames) {
+      return;
+    }
+
+    let mappedFrames = await updateFrameLocations(frames, sourceMapLoader);
+
+    mappedFrames = await expandFrames(mappedFrames, sourceMapLoader, getState);
+
+    const selectedFrameId = getSelectedFrameId(
+      getState(),
+      cx.thread,
+      mappedFrames
+    );
+
+    dispatch({
+      type: "MAP_FRAMES",
+      cx,
+      thread: cx.thread,
+      frames: mappedFrames,
+      selectedFrameId,
+    });
+  };
+}