From 1a75ba3c67cf68eeea4db1e430de28d50a974ab9 Mon Sep 17 00:00:00 2001
From: Ashok Menon <ashokmenon@fb.com>
Date: Tue, 1 Nov 2016 10:14:05 -0700
Subject: [PATCH] Expose BC version

Reviewed By: javache

Differential Revision: D4110361

fbshipit-source-id: 6cde7d8ca26d30a804f1a99cf9380dcbc0ff5541
---
 React/Executors/RCTJSCWrapper.h  | 8 ++++++++
 React/Executors/RCTJSCWrapper.mm | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/React/Executors/RCTJSCWrapper.h b/React/Executors/RCTJSCWrapper.h
index 68ddb46c17b..e112320cbc3 100644
--- a/React/Executors/RCTJSCWrapper.h
+++ b/React/Executors/RCTJSCWrapper.h
@@ -27,6 +27,13 @@ typedef bool (*JSValueIsNullFuncType)(JSContextRef, JSValueRef);
 typedef JSValueRef (*JSEvaluateScriptFuncType)(JSContextRef, JSStringRef, JSObjectRef, JSStringRef, int, JSValueRef *);
 typedef JSValueRef (*JSEvaluateBytecodeBundleFuncType)(JSContextRef, JSObjectRef, int, JSStringRef, JSValueRef *);
 
+/**
+ * JSNoBytecodeFileFormatVersion
+ *
+ * Version number indicating that bytecode is not supported by this runtime.
+ */
+extern const int32_t JSNoBytecodeFileFormatVersion;
+
 typedef struct RCTJSCWrapper {
   JSStringCreateWithCFStringFuncType JSStringCreateWithCFString;
   JSStringCreateWithUTF8CStringFuncType JSStringCreateWithUTF8CString;
@@ -43,6 +50,7 @@ typedef struct RCTJSCWrapper {
   JSValueIsNullFuncType JSValueIsNull;
   JSEvaluateScriptFuncType JSEvaluateScript;
   JSEvaluateBytecodeBundleFuncType JSEvaluateBytecodeBundle;
+  const int32_t JSBytecodeFileFormatVersion;
   Class JSContext;
   Class JSValue;
 } RCTJSCWrapper;
diff --git a/React/Executors/RCTJSCWrapper.mm b/React/Executors/RCTJSCWrapper.mm
index d7d3c95d337..625d430a6cb 100644
--- a/React/Executors/RCTJSCWrapper.mm
+++ b/React/Executors/RCTJSCWrapper.mm
@@ -41,6 +41,8 @@ static void *RCTCustomLibraryHandler(void)
   return handler;
 }
 
+const int32_t JSNoBytecodeFileFormatVersion = -1;
+
 static RCTJSCWrapper *RCTSetUpSystemLibraryPointers()
 {
   return new RCTJSCWrapper {
@@ -59,6 +61,7 @@ static RCTJSCWrapper *RCTSetUpSystemLibraryPointers()
     .JSValueIsNull = JSValueIsNull,
     .JSEvaluateScript = JSEvaluateScript,
     .JSEvaluateBytecodeBundle = NULL,
+    .JSBytecodeFileFormatVersion = JSNoBytecodeFileFormatVersion,
     .JSContext = [JSContext class],
     .JSValue = [JSValue class],
   };
@@ -87,6 +90,7 @@ static RCTJSCWrapper *RCTSetUpCustomLibraryPointers()
     .JSValueIsNull = (JSValueIsNullFuncType)dlsym(libraryHandle, "JSValueIsNull"),
     .JSEvaluateScript = (JSEvaluateScriptFuncType)dlsym(libraryHandle, "JSEvaluateScript"),
     .JSEvaluateBytecodeBundle = (JSEvaluateBytecodeBundleFuncType)dlsym(libraryHandle, "JSEvaluateBytecodeBundle"),
+    .JSBytecodeFileFormatVersion = *(const int32_t *)dlsym(libraryHandle, "JSBytecodeFileFormatVersion"),
     .JSContext = (__bridge Class)dlsym(libraryHandle, "OBJC_CLASS_$_JSContext"),
     .JSValue = (__bridge Class)dlsym(libraryHandle, "OBJC_CLASS_$_JSValue"),
   };