Clang: Clean up exceptions

* Extract common stuff into the base class ClangException
* Remove unused exceptions TranslationUnitParseErrorException and
  TranslationUnitReparseErrorException
* Do not send error messages to the Qt Creator side. The messages were
  only generated when the backend crashed and while it was not yet fully
  re-initialized (e.g. do code completion right after crash where the
  document was not yet registered at the backend).

Change-Id: I91d98d5ef681ad487f7a2fd66f78fa7cd1e958df
Reviewed-by: David Schulz <david.schulz@qt.io>

src/tools/clangbackend/ipcsource/clangexceptions.cpp

@@ -27,197 +27,51 @@
 
 namespace ClangBackEnd {
 
+const char *ClangBaseException::what() const Q_DECL_NOEXCEPT
+{
+    return m_info.constData();
+}
+
 ProjectPartDoNotExistException::ProjectPartDoNotExistException(
         const Utf8StringVector &projectPartIds)
-    : projectPartIds_(projectPartIds)
-{
-}
-
-const Utf8StringVector &ProjectPartDoNotExistException::projectPartIds() const
-{
-    return projectPartIds_;
-}
-
-const char *ProjectPartDoNotExistException::what() const Q_DECL_NOEXCEPT
-{
-    if (what_.isEmpty())
-        what_ += Utf8StringLiteral("ProjectPart files ")
-                + projectPartIds().join(Utf8StringLiteral(", "))
-                + Utf8StringLiteral(" does not exist!");
-
-    return what_.constData();
-}
-
-DocumentAlreadyExistsException::DocumentAlreadyExistsException(
-        const FileContainer &fileContainer)
-    : fileContainer_(fileContainer)
 {
+    m_info += Utf8StringLiteral("ProjectPart files ")
+           + projectPartIds.join(Utf8StringLiteral(", "))
+           + Utf8StringLiteral(" does not exist!");
 }
 
 DocumentAlreadyExistsException::DocumentAlreadyExistsException(
         const Utf8String &filePath,
         const Utf8String &projectPartId)
-    : fileContainer_(filePath, projectPartId)
 {
+    m_info += Utf8StringLiteral("Document '")
+            + filePath
+            + Utf8StringLiteral("' with the project part id '")
+            + projectPartId
+            + Utf8StringLiteral("' already exists!");
 }
 
-const FileContainer &DocumentAlreadyExistsException::fileContainer() const
+DocumentDoesNotExistException::DocumentDoesNotExistException(const Utf8String &filePath,
+                                                             const Utf8String &projectPartId)
 {
-    return fileContainer_;
-}
-
-const char *DocumentAlreadyExistsException::what() const Q_DECL_NOEXCEPT
-{
-    if (what_.isEmpty()) {
-        what_ += Utf8StringLiteral("Translation unit '")
-                + fileContainer_.filePath()
-                + Utf8StringLiteral("' with the project part id '")
-                + fileContainer_.projectPartId()
-                + Utf8StringLiteral("' already exists!");
-    }
-
-    return what_.constData();
-}
-
-DocumentDoesNotExistException::DocumentDoesNotExistException(
-        const FileContainer &fileContainer)
-    : fileContainer_(fileContainer)
-{
-}
-
-DocumentDoesNotExistException::DocumentDoesNotExistException(
-        const Utf8String &filePath,
-        const Utf8String &projectPartId)
-    : fileContainer_(filePath, projectPartId)
-{
-}
-
-const FileContainer &DocumentDoesNotExistException::fileContainer() const
-{
-    return fileContainer_;
-}
-
-const char *DocumentDoesNotExistException::what() const Q_DECL_NOEXCEPT
-{
-    if (what_.isEmpty())
-        what_ += Utf8StringLiteral("Translation unit '")
-                + fileContainer_.filePath()
-                + Utf8StringLiteral("' with the project part id '")
-                + fileContainer_.projectPartId()
-                + Utf8StringLiteral("' does not exits!");
-
-    return what_.constData();
+    m_info += Utf8StringLiteral("Document '")
+            + filePath
+            + Utf8StringLiteral("' with the project part id '")
+            + projectPartId
+            + Utf8StringLiteral("' does not exits!");
 }
 
 DocumentFileDoesNotExistException::DocumentFileDoesNotExistException(
         const Utf8String &filePath)
-    : filePath_(filePath)
 {
+    m_info += Utf8StringLiteral("File ")
+            + filePath
+            + Utf8StringLiteral(" does not exist in file system!");
 }
 
-const Utf8String &DocumentFileDoesNotExistException::filePath() const
+DocumentIsNullException::DocumentIsNullException()
 {
-    return filePath_;
-}
-
-const char *DocumentFileDoesNotExistException::what() const Q_DECL_NOEXCEPT
-{
-    if (what_.isEmpty())
-        what_ += Utf8StringLiteral("File ")
-                + filePath()
-                + Utf8StringLiteral(" does not exist in file system!");
-
-    return what_.constData();
-}
-
-const char *DocumentIsNullException::what() const Q_DECL_NOEXCEPT
-{
-    return "Tried to access a null TranslationUnit!";
-}
-
-TranslationUnitParseErrorException::TranslationUnitParseErrorException(
-        const Utf8String &filePath,
-        const Utf8String &projectPartId,
-        CXErrorCode errorCode)
-    : filePath_(filePath),
-      projectPartId_(projectPartId),
-      errorCode_(errorCode)
-{
-}
-
-const Utf8String &TranslationUnitParseErrorException::filePath() const
-{
-    return filePath_;
-}
-
-const Utf8String &TranslationUnitParseErrorException::projectPartId() const
-{
-    return projectPartId_;
-}
-
-#define RETURN_TEXT_FOR_CASE(enumValue) case enumValue: return #enumValue
-static const char *errorCodeToText(CXErrorCode errorCode)
-{
-    switch (errorCode) {
-        RETURN_TEXT_FOR_CASE(CXError_Success);
-        RETURN_TEXT_FOR_CASE(CXError_Failure);
-        RETURN_TEXT_FOR_CASE(CXError_Crashed);
-        RETURN_TEXT_FOR_CASE(CXError_InvalidArguments);
-        RETURN_TEXT_FOR_CASE(CXError_ASTReadError);
-    }
-
-    return "UnknownCXErrorCode";
-}
-#undef RETURN_TEXT_FOR_CASE
-
-const char *TranslationUnitParseErrorException::what() const Q_DECL_NOEXCEPT
-{
-    if (what_.isEmpty()) {
-        what_ += Utf8StringLiteral("clang_parseTranslationUnit() failed for file ")
-                + filePath()
-                + Utf8StringLiteral(" in project ")
-                + projectPartId()
-                + Utf8StringLiteral(": ")
-                + Utf8String::fromUtf8(errorCodeToText(errorCode_))
-                + Utf8StringLiteral(".");
-    }
-
-    return what_.constData();
-}
-
-TranslationUnitReparseErrorException::TranslationUnitReparseErrorException(
-        const Utf8String &filePath,
-        const Utf8String &projectPartId,
-        int errorCode)
-    : filePath_(filePath),
-      projectPartId_(projectPartId),
-      errorCode_(errorCode)
-{
-}
-
-const Utf8String &TranslationUnitReparseErrorException::filePath() const
-{
-    return filePath_;
-}
-
-const Utf8String &TranslationUnitReparseErrorException::projectPartId() const
-{
-    return projectPartId_;
-}
-
-const char *TranslationUnitReparseErrorException::what() const Q_DECL_NOEXCEPT
-{
-    if (what_.isEmpty()) {
-        what_ += Utf8StringLiteral("clang_reparseTranslationUnit() failed for file ")
-                + filePath()
-                + Utf8StringLiteral(" in project ")
-                + projectPartId()
-                + Utf8StringLiteral(": ")
-                + Utf8String::fromString(QString::number(errorCode_))
-                + Utf8StringLiteral(".");
-    }
-
-    return what_.constData();
+    m_info = Utf8String::fromUtf8("Tried to access a null Document!");
 }
 
 } // namespace ClangBackEnd