implement Function.toString()

.github/workflows/ci.yml

@@ -1,7 +1,12 @@
 
 name: CI
 
-on: [push, pull_request]
+on:
+  - push:
+      branches:
+        - 0.11.0-aliucord
+
+  - pull_request
 
 jobs:
   build-android:

lib/VM/JSLib/Function.cpp

@@ -11,8 +11,8 @@
 //===----------------------------------------------------------------------===//
 #include "JSLibInternal.h"
 
+#include "hermes/BCGen/HBC/BytecodeDisassembler.h"
 #include "hermes/Regex/Executor.h"
-#include "hermes/Regex/RegexTraits.h"
 #include "hermes/VM/ArrayLike.h"
 #include "hermes/VM/Callable.h"
 #include "hermes/VM/Operations.h"
@@ -191,9 +191,28 @@ functionPrototypeToString(void *, Runtime *runtime, NativeArgs args) {
       strBuf.append(buf);
     }
 
-    // Avoid using the [native code] string to prevent extra wrapping overhead
-    // in, e.g., Babel's class extension mechanism.
-    strBuf.append(") { [bytecode] }");
+    strBuf.append(") {\n");
+
+    if (auto jsFunc = dyn_vmcast<JSFunction>(*func)) {
+      auto funcId = jsFunc->getCodeBlock()->getFunctionID();
+
+      hbc::BytecodeDisassembler disassembler(jsFunc->getRuntimeModule()->getBytecodeSharedPtr());
+      hbc::DisassemblyOptions options = hbc::DisassemblyOptions::IncludeSource |
+        hbc::DisassemblyOptions::IncludeFunctionIds | hbc::DisassemblyOptions::Pretty;
+      disassembler.setOptions(options);
+
+      std::string str;
+      llvh::raw_string_ostream output(str);
+      disassembler.disassembleFunction(funcId, output);
+
+      strBuf.append(output.str());
+    } else {
+      // Avoid using the [native code] string to prevent extra wrapping overhead
+      // in, e.g., Babel's class extension mechanism.
+      strBuf.append("    [bytecode]\n");
+    }
+
+    strBuf.append("}");
   }
 
   // Finally allocate a StringPrimitive.