From 5fefdf7ccade18e5ac77ef152aa533e60d6d5b81 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kry=C5=A1tof=20Wold=C5=99ich?=
 <31292499+krystofwoldrich@users.noreply.github.com>
Date: Tue, 19 Sep 2023 18:00:32 +0200
Subject: [PATCH] feat(sdk): Add Hermes Debug Info flag to React Native Context
 (#3290)

---
 CHANGELOG.md                              |  7 ++
 src/js/integrations/reactnativeinfo.ts    | 33 ++++++++-
 test/integrations/reactnativeinfo.test.ts | 85 +++++++++++++++++++++++
 3 files changed, 124 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b6502acc8e..c369ef789e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## Unreleased
+
+### Features
+
+- Add Hermes Debug Info flag to React Native Context ([#3290](https://github.com/getsentry/sentry-react-native/pull/3290))
+  - This flag equals `true` when Hermes Bundle contains Debug Info (Hermes Source Map was not emitted)
+
 ## 5.9.2
 
 ### Fixes
diff --git a/src/js/integrations/reactnativeinfo.ts b/src/js/integrations/reactnativeinfo.ts
index e1aa23a052..c7b52cebbe 100644
--- a/src/js/integrations/reactnativeinfo.ts
+++ b/src/js/integrations/reactnativeinfo.ts
@@ -18,6 +18,7 @@ export interface ReactNativeContext extends Context {
   hermes_version?: string;
   react_native_version: string;
   component_stack?: string;
+  hermes_debug_info?: boolean;
 }
 
 /** Loads React Native context at runtime */
@@ -50,8 +51,9 @@ export class ReactNativeInfo implements Integration {
         reactNativeContext.js_engine = 'hermes';
         const hermesVersion = getHermesVersion();
         if (hermesVersion) {
-          reactNativeContext.hermes_version = getHermesVersion();
+          reactNativeContext.hermes_version = hermesVersion;
         }
+        reactNativeContext.hermes_debug_info = !isEventWithHermesBytecodeFrames(event);
       } else if (reactNativeError?.jsEngine) {
         reactNativeContext.js_engine = reactNativeError.jsEngine;
       }
@@ -76,3 +78,32 @@ export class ReactNativeInfo implements Integration {
     });
   }
 }
+
+/**
+ * Guess if the event contains frames with Hermes bytecode
+ * (thus Hermes bundle doesn't contain debug info)
+ * based on the event exception/threads frames.
+ *
+ * This function can be relied on only if Hermes is enabled!
+ *
+ * Hermes bytecode position is always line 1 and column 0-based number.
+ * If Hermes bundle has debug info, the bytecode frames pos are calculated
+ * back to the plain bundle source code positions and line will be > 1.
+ *
+ * Line 1 contains start time var, it's safe to assume it won't crash.
+ * The above only applies when Hermes is enabled.
+ *
+ * Javascript/Hermes bytecode frames have platform === undefined.
+ * Native (Java, ObjC, C++) frames have platform === 'android'/'ios'/'native'.
+ */
+function isEventWithHermesBytecodeFrames(event: Event): boolean {
+  for (const value of event.exception?.values || event.threads?.values || []) {
+    for (const frame of value.stacktrace?.frames || []) {
+      // platform === undefined we assume it's javascript (only native frames use the platform attribute)
+      if (frame.platform === undefined && frame.lineno === 1) {
+        return true;
+      }
+    }
+  }
+  return false;
+}
diff --git a/test/integrations/reactnativeinfo.test.ts b/test/integrations/reactnativeinfo.test.ts
index 52c9c5a823..62784f4dc4 100644
--- a/test/integrations/reactnativeinfo.test.ts
+++ b/test/integrations/reactnativeinfo.test.ts
@@ -49,6 +49,7 @@ describe('React Native Info', () => {
           turbo_module: false,
           fabric: false,
           js_engine: 'hermes',
+          hermes_debug_info: true,
           react_native_version: '1000.0.0-test',
           expo: false,
         },
@@ -148,6 +149,90 @@ describe('React Native Info', () => {
       test: 'context',
     });
   });
+
+  it('add hermes_debug_info to react_native_context based on exception frames (hermes bytecode frames present -> no debug info)', async () => {
+    mockedIsHermesEnabled = jest.fn().mockReturnValue(true);
+
+    const mockedEvent: Event = {
+      exception: {
+        values: [
+          {
+            stacktrace: {
+              frames: [
+                {
+                  platform: 'java',
+                  lineno: 2,
+                },
+                {
+                  lineno: 1,
+                },
+              ],
+            },
+          },
+        ],
+      },
+    };
+    const actualEvent = await executeIntegrationFor(mockedEvent, {});
+
+    expectMocksToBeCalledOnce();
+    expect(actualEvent?.contexts?.react_native_context?.hermes_debug_info).toEqual(false);
+  });
+
+  it('does not hermes_debug_info to react_native_context based on threads frames (hermes bytecode frames present -> no debug info)', async () => {
+    mockedIsHermesEnabled = jest.fn().mockReturnValue(true);
+
+    const mockedEvent: Event = {
+      threads: {
+        values: [
+          {
+            stacktrace: {
+              frames: [
+                {
+                  platform: 'java',
+                  lineno: 2,
+                },
+                {
+                  lineno: 1,
+                },
+              ],
+            },
+          },
+        ],
+      },
+    };
+    const actualEvent = await executeIntegrationFor(mockedEvent, {});
+
+    expectMocksToBeCalledOnce();
+    expect(actualEvent?.contexts?.react_native_context?.hermes_debug_info).toEqual(false);
+  });
+
+  it('adds hermes_debug_info to react_native_context (no hermes bytecode frames found -> debug info present)', async () => {
+    mockedIsHermesEnabled = jest.fn().mockReturnValue(true);
+
+    const mockedEvent: Event = {
+      threads: {
+        values: [
+          {
+            stacktrace: {
+              frames: [
+                {
+                  platform: 'java',
+                  lineno: 2,
+                },
+                {
+                  lineno: 2,
+                },
+              ],
+            },
+          },
+        ],
+      },
+    };
+    const actualEvent = await executeIntegrationFor(mockedEvent, {});
+
+    expectMocksToBeCalledOnce();
+    expect(actualEvent?.contexts?.react_native_context?.hermes_debug_info).toEqual(true);
+  });
 });
 
 function expectMocksToBeCalledOnce() {