sea: fix entry point file name

Refs: nodejs#48191 (comment)
Signed-off-by: Darshan Sen <raisinten@gmail.com>

Author: RaisinTen

lib/internal/util/embedding.js

@@ -2,7 +2,7 @@
 const { BuiltinModule: { normalizeRequirableId } } = require('internal/bootstrap/realm');
 const { Module, wrapSafe } = require('internal/modules/cjs/loader');
 const { codes: { ERR_UNKNOWN_BUILTIN_MODULE } } = require('internal/errors');
-const { getCodeCache } = internalBinding('sea');
+const { getCodeCache, getCodePath } = internalBinding('sea');
 
 // This is roughly the same as:
 //
@@ -16,7 +16,8 @@ const { getCodeCache } = internalBinding('sea');
 
 function embedderRunCjs(contents) {
   const filename = process.execPath;
-  const compiledWrapper = wrapSafe(filename, contents, undefined, getCodeCache());
+  const codeCache = getCodeCache();
+  const compiledWrapper = wrapSafe(codeCache ? getCodePath() : filename, contents, undefined, codeCache);
 
   const customModule = new Module(filename, null);
   customModule.filename = filename;

src/node_sea.cc

@@ -83,6 +83,12 @@ size_t SeaSerializer::Write(const SeaResource& sea) {
   written_total += WriteArithmetic<uint32_t>(flags);
   DCHECK_EQ(written_total, SeaResource::kHeaderSize);
 
+  Debug("Write SEA code path %p, size=%zu\n",
+        sea.code_path.data(),
+        sea.code_path.size());
+  written_total +=
+      WriteStringView(sea.code_path, StringLogMode::kAddressAndContent);
+
   Debug("Write SEA resource code %p, size=%zu\n",
         sea.code.data(),
         sea.code.size());
@@ -117,14 +123,19 @@ SeaResource SeaDeserializer::Read() {
   Debug("Read SEA flags %x\n", static_cast<uint32_t>(flags));
   CHECK_EQ(read_total, SeaResource::kHeaderSize);
 
+  std::string_view code_path =
+      ReadStringView(StringLogMode::kAddressAndContent);
+  Debug(
+      "Read SEA code path %p, size=%zu\n", code_path.data(), code_path.size());
+
   std::string_view code = ReadStringView(StringLogMode::kAddressAndContent);
   Debug("Read SEA resource code %p, size=%zu\n", code.data(), code.size());
 
   std::string_view code_cache = ReadStringView(StringLogMode::kAddressOnly);
   Debug("Read SEA resource code cache %p, size=%zu\n",
         code_cache.data(),
         code_cache.size());
-  return {flags, code, code_cache};
+  return {flags, code_path, code, code_cache};
 }
 
 std::string_view FindSingleExecutableBlob() {
@@ -208,6 +219,26 @@ void GetCodeCache(const FunctionCallbackInfo<Value>& args) {
   args.GetReturnValue().Set(buf);
 }
 
+void GetCodePath(const FunctionCallbackInfo<Value>& args) {
+  if (!IsSingleExecutable()) {
+    return;
+  }
+
+  Environment* env = Environment::GetCurrent(args);
+  Isolate* isolate = env->isolate();
+  HandleScope scope(isolate);
+
+  SeaResource sea_resource = FindSingleExecutableResource();
+
+  Local<String> code_path;
+  if (!String::NewFromUtf8(isolate, sea_resource.code_path.data())
+           .ToLocal(&code_path)) {
+    return;
+  }
+
+  args.GetReturnValue().Set(code_path);
+}
+
 std::tuple<int, char**> FixupArgsForSEA(int argc, char** argv) {
   // Repeats argv[0] at position 1 on argv as a replacement for the missing
   // entry point file path.
@@ -346,7 +377,7 @@ ExitCode GenerateSingleExecutableBlob(const SeaConfig& config) {
   }
   std::string code_cache = optional_code_cache.value();
 
-  SeaResource sea{config.flags, main_script, code_cache};
+  SeaResource sea{config.flags, config.main_path, main_script, code_cache};
 
   SeaSerializer serializer;
   serializer.Write(sea);
@@ -386,11 +417,13 @@ void Initialize(Local<Object> target,
             target,
             "isExperimentalSeaWarningNeeded",
             IsExperimentalSeaWarningNeeded);
+  SetMethod(context, target, "getCodePath", GetCodePath);
   SetMethod(context, target, "getCodeCache", GetCodeCache);
 }
 
 void RegisterExternalReferences(ExternalReferenceRegistry* registry) {
   registry->Register(IsExperimentalSeaWarningNeeded);
+  registry->Register(GetCodePath);
   registry->Register(GetCodeCache);
 }
 

src/node_sea.h

@@ -25,6 +25,7 @@ enum class SeaFlags : uint32_t {
 
 struct SeaResource {
   SeaFlags flags = SeaFlags::kDefault;
+  std::string_view code_path;
   std::string_view code;
   std::string_view code_cache;
 

test/fixtures/sea.js

@@ -18,6 +18,9 @@ if (createdRequire('./sea-config.json').disableExperimentalSEAWarning) {
 const { deepStrictEqual, strictEqual, throws } = require('assert');
 const { dirname } = require('node:path');
 
+// Checks that the source filename is used in the error stack trace.
+strictEqual(new Error('lol').stack.split('\n')[1], '    at sea.js:22:13');
+
 // Should be possible to require a core module that requires using the "node:"
 // scheme.
 {