report: make more items programmatically accessible

Prefer structured output over stringified information
for libuv handles and the native stack trace.

PR-URL: #26019
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: addaleax

doc/api/report.md

@@ -78,12 +78,26 @@ is provided below for reference.
     ]
   },
   "nativeStack": [
-    " [pc=0xa7ef87]  [/home/nodeuser/project/node/out/Release/node]",
-    " [pc=0xa81adb] report::TriggerNodeReport(v8::Isolate*, node::Environment*, char const*, char const*, std::string, v8::Local<v8::String>) [/home/nodeuser/project/node/out/Release/node]",
-    " [pc=0xa834f2] report::OnUncaughtException(v8::FunctionCallbackInfo<v8::Value> const&) [/home/nodeuser/project/node/out/Release/node]",
-    " [pc=0xbe6b78]  [/home/nodeuser/project/node/out/Release/node]",
-    " [pc=0xbe7596] v8::internal::Builtin_HandleApiCall(int, v8::internal::Object**, v8::internal::Isolate*) [/home/nodeuser/project/node/out/Release/node]",
-    " [pc=0x1930cae]  [/home/nodeuser/project/node/out/Release/node]"
+    {
+      "pc": "0x000055b57f07a9ef",
+      "symbol": "report::GetNodeReport(v8::Isolate*, node::Environment*, char const*, char const*, v8::Local<v8::String>, std::ostream&) [./node]"
+    },
+    {
+      "pc": "0x000055b57f07cf03",
+      "symbol": "report::GetReport(v8::FunctionCallbackInfo<v8::Value> const&) [./node]"
+    },
+    {
+      "pc": "0x000055b57f1bccfd",
+      "symbol": " [./node]"
+    },
+    {
+      "pc": "0x000055b57f1be048",
+      "symbol": "v8::internal::Builtin_HandleApiCall(int, v8::internal::Object**, v8::internal::Isolate*) [./node]"
+    },
+    {
+      "pc": "0x000055b57feeda0e",
+      "symbol": " [./node]"
+    }
   ],
   "javascriptHeap": {
     "totalMemory": 6127616,
@@ -175,46 +189,75 @@ is provided below for reference.
       "details": ""
     },
     {
+      "repeat": 0,
+      "firesInMsFromNow": 94403548320796,
+      "expired": true,
       "type": "timer",
       "is_active": false,
       "is_referenced": false,
-      "address": "0x00007fff5fbfeab0",
-      "details": "repeat: 0, timeout expired: 18075165916 ms ago"
+      "address": "0x00007fff5fbfeab0"
     },
     {
       "type": "check",
       "is_active": true,
       "is_referenced": false,
-      "address": "0x00007fff5fbfeb48",
-      "details": ""
+      "address": "0x00007fff5fbfeb48"
     },
     {
       "type": "idle",
       "is_active": false,
       "is_referenced": true,
-      "address": "0x00007fff5fbfebc0",
-      "details": ""
+      "address": "0x00007fff5fbfebc0"
     },
     {
       "type": "prepare",
       "is_active": false,
       "is_referenced": false,
-      "address": "0x00007fff5fbfec38",
-      "details": ""
+      "address": "0x00007fff5fbfec38"
     },
     {
       "type": "check",
       "is_active": false,
       "is_referenced": false,
-      "address": "0x00007fff5fbfecb0",
-      "details": ""
+      "address": "0x00007fff5fbfecb0"
     },
     {
       "type": "async",
       "is_active": true,
       "is_referenced": false,
-      "address": "0x000000010188f2e0",
-      "details": ""
+      "address": "0x000000010188f2e0"
+    },
+    {
+      "width": 204,
+      "height": 55,
+      "fd": 17,
+      "writeQueueSize": 0,
+      "readable": true,
+      "writable": true,
+      "type": "tty",
+      "is_active": false,
+      "is_referenced": true,
+      "address": "0x000055b581db0e18"
+    },
+    {
+      "signum": 28,
+      "signal": "SIGWINCH",
+      "type": "signal",
+      "is_active": true,
+      "is_referenced": false,
+      "address": "0x000055b581d80010"
+    },
+    {
+      "width": 204,
+      "height": 55,
+      "fd": 19,
+      "writeQueueSize": 0,
+      "readable": true,
+      "writable": true,
+      "type": "tty",
+      "is_active": true,
+      "is_referenced": true,
+      "address": "0x000055b581df59f8"
     },
     {
       "type": "loop",

src/node_report.cc

@@ -216,9 +216,8 @@ void GetNodeReport(Isolate* isolate,
   // Obtain the current time and the pid (platform dependent)
   TIME_TYPE tm_struct;
   LocalTime(&tm_struct);
-  std::string str = "NA";
   WriteNodeReport(
-      isolate, env, message, location, str, out, stackstr, &tm_struct);
+      isolate, env, message, location, "", out, stackstr, &tm_struct);
 }
 
 // Internal function to coordinate and write the various
@@ -249,7 +248,7 @@ static void WriteNodeReport(Isolate* isolate,
   if (!filename.empty())
     writer.json_keyvalue("filename", filename);
   else
-    writer.json_keyvalue("filename", "''");
+    writer.json_keyvalue("filename", JSONWriter::Null{});
 
   // Report dump event and module load date/time stamps
   char timebuf[64];
@@ -431,13 +430,13 @@ static void PrintNativeStack(JSONWriter* writer) {
   const int size = sym_ctx->GetStackTrace(frames, arraysize(frames));
   writer->json_arraystart("nativeStack");
   int i;
-  std::ostringstream buf;
   for (i = 1; i < size; i++) {
     void* frame = frames[i];
-    buf.str("");
-    buf << " [pc=" << frame << "] ";
-    buf << sym_ctx->LookupSymbol(frame).Display().c_str();
-    writer->json_element(buf.str());
+    writer->json_start();
+    writer->json_keyvalue("pc",
+                          ValueToHexString(reinterpret_cast<uintptr_t>(frame)));
+    writer->json_keyvalue("symbol", sym_ctx->LookupSymbol(frame).Display());
+    writer->json_end();
   }
   writer->json_arrayend();
 }

src/node_report.h

@@ -54,7 +54,6 @@ void GetNodeReport(v8::Isolate* isolate,
                    std::ostream& out);
 
 // Function declarations - utility functions in src/node_report_utils.cc
-void ReportEndpoints(uv_handle_t* h, std::ostringstream& out);
 void WalkHandle(uv_handle_t* h, void* arg);
 std::string EscapeJsonChars(const std::string& str);
 
@@ -157,6 +156,8 @@ class JSONWriter {
     state_ = kAfterValue;
   }
 
+  struct Null {};  // Usable as a JSON value.
+
  private:
   template <typename T,
             typename test_for_number = typename std::
@@ -168,6 +169,7 @@ class JSONWriter {
       out_ << number;
   }
 
+  inline void write_value(Null null) { out_ << "null"; }
   inline void write_value(const char* str) { write_string(str); }
   inline void write_value(const std::string& str) { write_string(str); }