From d7fbf2a9df8904d495c4c86e6f575d44185eae1b Mon Sep 17 00:00:00 2001
From: Gaming4JC <g4jc@hyperbola.info>
Date: Sun, 9 Jun 2019 14:44:37 -0400
Subject: 1283712 - Part 6: Add xpc::ErrorBase, xpc::ErrorNote, and
 xpc::ErrorReport.mNotes.

---
 js/xpconnect/src/nsXPConnect.cpp | 126 ++++++++++++++++++++++++++++++---------
 js/xpconnect/src/xpcpublic.h     |  58 +++++++++++++-----
 2 files changed, 142 insertions(+), 42 deletions(-)

diff --git a/js/xpconnect/src/nsXPConnect.cpp b/js/xpconnect/src/nsXPConnect.cpp
index 0466175b1..4a403874b 100644
--- a/js/xpconnect/src/nsXPConnect.cpp
+++ b/js/xpconnect/src/nsXPConnect.cpp
@@ -169,10 +169,32 @@ nsXPConnect::IsISupportsDescendant(nsIInterfaceInfo* info)
     return found;
 }
 
+void
+xpc::ErrorBase::Init(JSErrorBase* aReport)
+{
+    if (!aReport->filename) {
+        mFileName.SetIsVoid(true);
+    } else {
+        mFileName.AssignWithConversion(aReport->filename);
+    }
+
+    mLineNumber = aReport->lineno;
+    mColumn = aReport->column;
+}
+
+void
+xpc::ErrorNote::Init(JSErrorNotes::Note* aNote)
+{
+    xpc::ErrorBase::Init(aNote);
+
+    ErrorNoteToMessageString(aNote, mErrorMsg);
+}
+
 void
 xpc::ErrorReport::Init(JSErrorReport* aReport, const char* aToStringResult,
                        bool aIsChrome, uint64_t aWindowID)
 {
+    xpc::ErrorBase::Init(aReport);
     mCategory = aIsChrome ? NS_LITERAL_CSTRING("chrome javascript")
                           : NS_LITERAL_CSTRING("content javascript");
     mWindowID = aWindowID;
@@ -182,12 +204,6 @@ xpc::ErrorReport::Init(JSErrorReport* aReport, const char* aToStringResult,
         AppendUTF8toUTF16(aToStringResult, mErrorMsg);
     }
 
-    if (!aReport->filename) {
-        mFileName.SetIsVoid(true);
-    } else {
-        mFileName.AssignWithConversion(aReport->filename);
-    }
-
     mSourceLine.Assign(aReport->linebuf(), aReport->linebufLength());
     const JSErrorFormatString* efs = js::GetErrorMessage(nullptr, aReport->errorNumber);
 
@@ -197,10 +213,20 @@ xpc::ErrorReport::Init(JSErrorReport* aReport, const char* aToStringResult,
         mErrorMsgName.AssignASCII(efs->name);
     }
 
-    mLineNumber = aReport->lineno;
-    mColumn = aReport->column;
     mFlags = aReport->flags;
     mIsMuted = aReport->isMuted;
+
+    if (aReport->notes) {
+        if (!mNotes.SetLength(aReport->notes->length(), fallible)) {
+            return;
+        }
+
+        size_t i = 0;
+        for (auto&& note : *aReport->notes) {
+            mNotes.ElementAt(i).Init(note.get());
+            i++;
+        }
+    }
 }
 
 void
@@ -225,6 +251,59 @@ xpc::ErrorReport::Init(JSContext* aCx, mozilla::dom::Exception* aException,
 
 static LazyLogModule gJSDiagnostics("JSDiagnostics");
 
+void
+xpc::ErrorBase::AppendErrorDetailsTo(nsCString& error)
+{
+    error.Append(NS_LossyConvertUTF16toASCII(mFileName));
+    error.AppendLiteral(", line ");
+    error.AppendInt(mLineNumber, 10);
+    error.AppendLiteral(": ");
+    error.Append(NS_LossyConvertUTF16toASCII(mErrorMsg));
+}
+
+void
+xpc::ErrorNote::LogToStderr()
+{
+    if (!nsContentUtils::DOMWindowDumpEnabled()) {
+        return;
+    }
+
+    nsAutoCString error;
+    error.AssignLiteral("JavaScript note: ");
+    AppendErrorDetailsTo(error);
+
+    fprintf(stderr, "%s\n", error.get());
+    fflush(stderr);
+}
+
+void
+xpc::ErrorReport::LogToStderr()
+{
+    if (!nsContentUtils::DOMWindowDumpEnabled()) {
+        return;
+    }
+
+    nsAutoCString error;
+    error.AssignLiteral("JavaScript ");
+    if (JSREPORT_IS_STRICT(mFlags)) {
+        error.AppendLiteral("strict ");
+    }
+    if (JSREPORT_IS_WARNING(mFlags)) {
+        error.AppendLiteral("warning: ");
+    } else {
+        error.AppendLiteral("error: ");
+    }
+    AppendErrorDetailsTo(error);
+
+    fprintf(stderr, "%s\n", error.get());
+    fflush(stderr);
+
+    for (size_t i = 0, len = mNotes.Length(); i < len; i++) {
+        ErrorNote& note = mNotes[i];
+        note.LogToStderr();
+    }
+}
+
 void
 xpc::ErrorReport::LogToConsole()
 {
@@ -233,25 +312,7 @@ xpc::ErrorReport::LogToConsole()
 void
 xpc::ErrorReport::LogToConsoleWithStack(JS::HandleObject aStack)
 {
-    // Log to stdout.
-    if (nsContentUtils::DOMWindowDumpEnabled()) {
-        nsAutoCString error;
-        error.AssignLiteral("JavaScript ");
-        if (JSREPORT_IS_STRICT(mFlags))
-            error.AppendLiteral("strict ");
-        if (JSREPORT_IS_WARNING(mFlags))
-            error.AppendLiteral("warning: ");
-        else
-            error.AppendLiteral("error: ");
-        error.Append(NS_LossyConvertUTF16toASCII(mFileName));
-        error.AppendLiteral(", line ");
-        error.AppendInt(mLineNumber, 10);
-        error.AppendLiteral(": ");
-        error.Append(NS_LossyConvertUTF16toASCII(mErrorMsg));
-
-        fprintf(stderr, "%s\n", error.get());
-        fflush(stderr);
-    }
+    LogToStderr();
 
     MOZ_LOG(gJSDiagnostics,
             JSREPORT_IS_WARNING(mFlags) ? LogLevel::Warning : LogLevel::Error,
@@ -285,6 +346,17 @@ xpc::ErrorReport::LogToConsoleWithStack(JS::HandleObject aStack)
 
 }
 
+/* static */
+void
+xpc::ErrorNote::ErrorNoteToMessageString(JSErrorNotes::Note* aNote,
+                                         nsAString& aString)
+{
+    aString.Truncate();
+    if (aNote->message()) {
+        aString.Append(NS_ConvertUTF8toUTF16(aNote->message().c_str()));
+    }
+}
+
 /* static */
 void
 xpc::ErrorReport::ErrorReportToMessageString(JSErrorReport* aReport,
diff --git a/js/xpconnect/src/xpcpublic.h b/js/xpconnect/src/xpcpublic.h
index fc8670d46..399cd2181 100644
--- a/js/xpconnect/src/xpcpublic.h
+++ b/js/xpconnect/src/xpcpublic.h
@@ -515,13 +515,50 @@ AllowCPOWsInAddon(const nsACString& addonId, bool allow);
 bool
 ExtraWarningsForSystemJS();
 
-class ErrorReport {
+class ErrorBase {
+  public:
+    nsString mErrorMsg;
+    nsString mFileName;
+    uint32_t mLineNumber;
+    uint32_t mColumn;
+
+    ErrorBase() : mLineNumber(0)
+                , mColumn(0)
+    {}
+
+    void Init(JSErrorBase* aReport);
+
+    void AppendErrorDetailsTo(nsCString& error);
+};
+
+class ErrorNote : public ErrorBase {
+  public:
+    void Init(JSErrorNotes::Note* aNote);
+
+    // Produce an error event message string from the given JSErrorNotes::Note.
+    // This may produce an empty string if aNote doesn't have a message
+    // attached.
+    static void ErrorNoteToMessageString(JSErrorNotes::Note* aNote,
+                                         nsAString& aString);
+
+    // Log the error note to the stderr.
+    void LogToStderr();
+};
+
+class ErrorReport : public ErrorBase {
   public:
     NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ErrorReport);
 
+    nsTArray<ErrorNote> mNotes;
+
+    nsCString mCategory;
+    nsString mSourceLine;
+    nsString mErrorMsgName;
+    uint64_t mWindowID;
+    uint32_t mFlags;
+    bool mIsMuted;
+
     ErrorReport() : mWindowID(0)
-                  , mLineNumber(0)
-                  , mColumn(0)
                   , mFlags(0)
                   , mIsMuted(false)
     {}
@@ -530,6 +567,7 @@ class ErrorReport {
               bool aIsChrome, uint64_t aWindowID);
     void Init(JSContext* aCx, mozilla::dom::Exception* aException,
               bool aIsChrome, uint64_t aWindowID);
+
     // Log the error report to the console.  Which console will depend on the
     // window id it was initialized with.
     void LogToConsole();
@@ -544,18 +582,8 @@ class ErrorReport {
     static void ErrorReportToMessageString(JSErrorReport* aReport,
                                            nsAString& aString);
 
-  public:
-
-    nsCString mCategory;
-    nsString mErrorMsgName;
-    nsString mErrorMsg;
-    nsString mFileName;
-    nsString mSourceLine;
-    uint64_t mWindowID;
-    uint32_t mLineNumber;
-    uint32_t mColumn;
-    uint32_t mFlags;
-    bool mIsMuted;
+    // Log the error report to the stderr.
+    void LogToStderr();
 
   private:
     ~ErrorReport() {}
-- 
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