[Syntax Highlighting] Add name and parameters syntax highlighting in Swift backtraces

lldb/source/Core/Mangled.cpp

@@ -148,6 +148,41 @@ void Mangled::SetValue(ConstString name) {
   }
 }
 
+// BEGIN SWIFT
+#ifdef LLDB_ENABLE_SWIFT
+std::pair<ConstString, DemangledNameInfo>
+GetSwiftDemangledStr(ConstString m_mangled, const SymbolContext *sc,
+                     ConstString &m_demangled) {
+  const char *mangled_name = m_mangled.AsCString("");
+  Log *log = GetLog(LLDBLog::Demangle);
+  LLDB_LOGF(log, "demangle swift: %s", mangled_name);
+  auto [demangled, info] = SwiftLanguageRuntime::TrackedDemangleSymbolAsString(
+      mangled_name, SwiftLanguageRuntime::eTypeName, sc);
+  info.PrefixRange.second =
+      std::min(info.BasenameRange.first, info.ArgumentsRange.first);
+  info.SuffixRange.first =
+      std::max(info.BasenameRange.second, info.ArgumentsRange.second);
+  info.SuffixRange.second = demangled.length();
+
+  // Don't cache the demangled name if the function isn't available yet.
+  if (!sc || !sc->function) {
+    LLDB_LOGF(log, "demangle swift: %s -> \"%s\" (not cached)", mangled_name,
+              demangled.c_str());
+    return std::make_pair(ConstString(demangled), info);
+  }
+  if (demangled.empty()) {
+    LLDB_LOGF(log, "demangle swift: %s -> error: failed to demangle",
+              mangled_name);
+  } else {
+    LLDB_LOGF(log, "demangle swift: %s -> \"%s\"", mangled_name,
+              demangled.c_str());
+    m_demangled.SetStringWithMangledCounterpart(demangled, m_mangled);
+  }
+  return std::make_pair(m_demangled, info);
+}
+#endif // LLDB_ENABLE_SWIFT
+// END SWIFT
+
 // Local helpers for different demangling implementations.
 static char *GetMSVCDemangledStr(llvm::StringRef M) {
   char *demangled_cstr = llvm::microsoftDemangle(
@@ -350,26 +385,9 @@ ConstString Mangled::GetDemangledNameImpl(bool force, // BEGIN SWIFT
     // explicitly unsupported on llvm.org.
 #ifdef LLDB_ENABLE_SWIFT
   {
-    const char *mangled_name = m_mangled.GetCString();
-    Log *log = GetLog(LLDBLog::Demangle);
-    LLDB_LOGF(log, "demangle swift: %s", mangled_name);
-    std::string demangled(SwiftLanguageRuntime::DemangleSymbolAsString(
-        mangled_name, SwiftLanguageRuntime::eTypeName, sc));
-    // Don't cache the demangled name the function isn't available yet.
-    if (!sc || !sc->function) {
-      LLDB_LOGF(log, "demangle swift: %s -> \"%s\" (not cached)", mangled_name,
-                demangled.c_str());
-      return ConstString(demangled);
-    }
-    if (demangled.empty()) {
-      LLDB_LOGF(log, "demangle swift: %s -> error: failed to demangle",
-                mangled_name);
-    } else {
-      LLDB_LOGF(log, "demangle swift: %s -> \"%s\"", mangled_name,
-                demangled.c_str());
-      m_demangled.SetStringWithMangledCounterpart(demangled, m_mangled);
-    }
-    return m_demangled;
+    auto demangled = GetSwiftDemangledStr(m_mangled, sc, m_demangled);
+    m_demangled_info.emplace(std::move(demangled.second));
+    return demangled.first;
   }
 #endif // LLDB_ENABLE_SWIFT
   break;

lldb/source/Plugins/Language/Swift/SwiftLanguage.cpp

@@ -1906,23 +1906,99 @@ SwiftLanguage::GetDemangledFunctionNameWithoutArguments(Mangled mangled) const {
   return mangled_name;
 }
 
-static std::optional<llvm::StringRef>
+static llvm::Expected<std::pair<llvm::StringRef, DemangledNameInfo>>
+GetAndValidateInfo(const SymbolContext &sc) {
+  Mangled mangled = sc.GetPossiblyInlinedFunctionName();
+  if (!mangled)
+    return llvm::createStringError("Function does not have a mangled name.");
+
+  const char *mangled_name = mangled.GetMangledName().AsCString("");
+  auto [demangled_name, info] =
+      SwiftLanguageRuntime::TrackedDemangleSymbolAsString(
+          mangled_name, SwiftLanguageRuntime::eSimplified, &sc);
+  info.PrefixRange.second =
+      std::min(info.BasenameRange.first, info.ArgumentsRange.first);
+  info.SuffixRange.first =
+      std::max(info.BasenameRange.second, info.ArgumentsRange.second);
+  info.SuffixRange.second = demangled_name.length();
+
+  if (demangled_name.empty())
+    return llvm::createStringError(
+        "Function '%s' does not have a demangled name.",
+        mangled.GetMangledName().AsCString(""));
+
+  // Function without a basename is nonsense.
+  if (!info.hasBasename())
+    return llvm::createStringError(
+        "DemangledInfo for '%s does not have basename range.",
+        demangled_name.data());
+
+  return std::make_pair(demangled_name, info);
+}
+
+static llvm::Expected<llvm::StringRef>
 GetDemangledBasename(const SymbolContext &sc) {
-  return std::nullopt;
+  auto info_or_err = GetAndValidateInfo(sc);
+  if (!info_or_err)
+    return info_or_err.takeError();
+
+  auto [demangled_name, info] = *info_or_err;
+
+  return demangled_name.slice(info.BasenameRange.first,
+                              info.BasenameRange.second);
 }
 
-static std::optional<llvm::StringRef>
+static llvm::Expected<llvm::StringRef>
 GetDemangledFunctionPrefix(const SymbolContext &sc) {
-  return std::nullopt;
+  auto info_or_err = GetAndValidateInfo(sc);
+  if (!info_or_err)
+    return info_or_err.takeError();
+
+  auto [demangled_name, info] = *info_or_err;
+
+  if (!info.hasPrefix())
+    return llvm::createStringError(
+        "DemangledInfo for '%s does not have suffix range.",
+        demangled_name.data());
+
+  return demangled_name.slice(info.PrefixRange.first, info.PrefixRange.second);
 }
 
-static std::optional<llvm::StringRef>
+static llvm::Expected<llvm::StringRef>
 GetDemangledFunctionSuffix(const SymbolContext &sc) {
-  return std::nullopt;
+  auto info_or_err = GetAndValidateInfo(sc);
+  if (!info_or_err)
+    return info_or_err.takeError();
+
+  auto [demangled_name, info] = *info_or_err;
+
+  if (!info.hasSuffix())
+    return llvm::createStringError(
+        "DemangledInfo for '%s does not have suffix range.",
+        demangled_name.data());
+
+  return demangled_name.slice(info.SuffixRange.first, info.SuffixRange.second);
 }
 
 static bool PrintDemangledArgumentList(Stream &s, const SymbolContext &sc) {
-  return false;
+  assert(sc.symbol);
+
+  auto info_or_err = GetAndValidateInfo(sc);
+  if (!info_or_err) {
+    LLDB_LOG_ERROR(GetLog(LLDBLog::Language), info_or_err.takeError(),
+                   "Failed to handle ${{function.formatted-arguments}} "
+                   "frame-format variable: {0}");
+    return false;
+  }
+  auto [demangled_name, info] = *info_or_err;
+
+  if (!info.hasArguments())
+    return false;
+
+  s << demangled_name.slice(info.ArgumentsRange.first,
+                            info.ArgumentsRange.second);
+
+  return true;
 }
 
 static VariableListSP GetFunctionVariableList(const SymbolContext &sc) {
@@ -1941,11 +2017,15 @@ bool SwiftLanguage::HandleFrameFormatVariable(const SymbolContext &sc,
                                               Stream &s) {
   switch (type) {
   case FormatEntity::Entry::Type::FunctionBasename: {
-    std::optional<llvm::StringRef> name = GetDemangledBasename(sc);
-    if (!name)
+    auto name_or_err = GetDemangledBasename(sc);
+    if (!name_or_err) {
+      LLDB_LOG_ERROR(
+          GetLog(LLDBLog::Language), name_or_err.takeError(),
+          "Failed to handle ${{function.basename}} frame-format variable: {0}");
       return false;
+    }
 
-    s << *name;
+    s << *name_or_err;
 
     return true;
   }
@@ -1972,20 +2052,28 @@ bool SwiftLanguage::HandleFrameFormatVariable(const SymbolContext &sc,
     return true;
   }
   case FormatEntity::Entry::Type::FunctionPrefix: {
-    std::optional<llvm::StringRef> prefix = GetDemangledFunctionPrefix(sc);
-    if (!prefix)
+    auto prefix_or_err = GetDemangledFunctionPrefix(sc);
+    if (!prefix_or_err) {
+      LLDB_LOG_ERROR(
+          GetLog(LLDBLog::Language), prefix_or_err.takeError(),
+          "Failed to handle ${{function.prefix}} frame-format variable: {0}");
       return false;
+    }
 
-    s << *prefix;
+    s << *prefix_or_err;
 
     return true;
   }
   case FormatEntity::Entry::Type::FunctionSuffix: {
-    std::optional<llvm::StringRef> suffix = GetDemangledFunctionSuffix(sc);
-    if (!suffix)
+    auto suffix_or_err = GetDemangledFunctionSuffix(sc);
+    if (!suffix_or_err) {
+      LLDB_LOG_ERROR(
+          GetLog(LLDBLog::Language), suffix_or_err.takeError(),
+          "Failed to handle ${{function.suffix}} frame-format variable: {0}");
       return false;
+    }
 
-    s << *suffix;
+    s << *suffix_or_err;
 
     return true;
   }
@@ -2019,7 +2107,7 @@ class PluginProperties : public Properties {
   }
 
   FormatEntity::Entry GetFunctionNameFormat() const {
-    return GetPropertyAtIndexAs<const FormatEntity::Entry>(
+    return GetPropertyAtIndexAs<FormatEntity::Entry>(
         ePropertyFunctionNameFormat, {});
   }
 };

lldb/source/Plugins/Language/Swift/SwiftMangled.h

@@ -0,0 +1,97 @@
+//===-- SwiftMangled.h ------------------------------------------*- C++ -*-===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_SwiftMangled_h_
+#define liblldb_SwiftMangled_h_
+
+#include "lldb/Core/DemangledNameInfo.h"
+#include "swift/Demangling/Demangle.h"
+
+using namespace swift::Demangle;
+
+/// A NodePrinter class with range tracking capabilities.
+///
+/// When used instead of a regular NodePrinter, this class will store additional
+/// range information of the demangled name in the `info` attribute, such as the
+/// range of the name of a method.
+class TrackingNodePrinter : public NodePrinter {
+public:
+  TrackingNodePrinter(DemangleOptions options) : NodePrinter(options) {}
+
+  lldb_private::DemangledNameInfo getInfo() { return info; }
+
+private:
+  lldb_private::DemangledNameInfo info;
+  std::optional<unsigned> parametersDepth;
+
+  void startName() {
+    if (!info.hasBasename())
+      info.BasenameRange.first = getStreamLength();
+  }
+
+  void endName() {
+    if (!info.hasBasename())
+      info.BasenameRange.second = getStreamLength();
+  }
+
+  void startParameters(unsigned depth) {
+    if (parametersDepth || !info.hasBasename() ||
+        info.ArgumentsRange.first < info.ArgumentsRange.second) {
+      return;
+    }
+    info.ArgumentsRange.first = getStreamLength();
+    parametersDepth = depth;
+  }
+
+  void endParameters(unsigned depth) {
+    if (!parametersDepth || *parametersDepth != depth ||
+        info.ArgumentsRange.first < info.ArgumentsRange.second) {
+      return;
+    }
+    info.ArgumentsRange.second = getStreamLength();
+  }
+
+  bool shouldTrackNameRange(NodePointer Node) const {
+    assert(Node);
+    switch (Node->getKind()) {
+    case Node::Kind::Function:
+    case Node::Kind::Constructor:
+    case Node::Kind::Allocator:
+    case Node::Kind::ExplicitClosure:
+      return true;
+    default:
+      return false;
+    }
+  }
+
+  void printFunctionName(bool hasName, llvm::StringRef &OverwriteName,
+                         llvm::StringRef &ExtraName, bool MultiWordName,
+                         int &ExtraIndex, NodePointer Entity,
+                         unsigned int depth) override {
+    if (shouldTrackNameRange(Entity))
+      startName();
+    NodePrinter::printFunctionName(hasName, OverwriteName, ExtraName,
+                                   MultiWordName, ExtraIndex, Entity, depth);
+    if (shouldTrackNameRange(Entity))
+      endName();
+  }
+
+  void printFunctionParameters(NodePointer LabelList, NodePointer ParameterType,
+                               unsigned depth, bool showTypes) override {
+    startParameters(depth);
+    NodePrinter::printFunctionParameters(LabelList, ParameterType, depth,
+                                         showTypes);
+    endParameters(depth);
+  }
+};
+
+#endif // liblldb_SwiftMangled_h_

lldb/source/Plugins/LanguageRuntime/Swift/SwiftLanguageRuntime.h

@@ -200,13 +200,35 @@ class SwiftLanguageRuntime : public LanguageRuntime {
   IsSwiftAsyncAwaitResumePartialFunctionSymbol(llvm::StringRef name);
 
   enum DemangleMode { eSimplified, eTypeName, eDisplayTypeName };
+
+  /// Demangle a symbol to a string.
+  ///
+  /// \param symbol The mangled symbol to demangle.
+  /// \param mode The `DemangleMode` to use when demangling.
+  /// \param sc The associated `SymbolContext`.
+  /// \param exe_ctx The associated `ExecutionContext`.
+  ///
+  /// \return The demangled symbol.
   static std::string
   DemangleSymbolAsString(llvm::StringRef symbol, DemangleMode mode,
                          const SymbolContext *sc = nullptr,
                          const ExecutionContext *exe_ctx = nullptr);
 
   static std::string GetParentNameIfClosure(Function &func);
 
+  /// Demangle a symbol to a string with additional range information.
+  ///
+  /// \param symbol The mangled symbol to demangle.
+  /// \param mode The `DemangleMode` to use when demangling.
+  /// \param sc The associated `SymbolContext`.
+  /// \param exe_ctx The associated `ExecutionContext`.
+  ///
+  /// \return The demangled symbol as well as range tracking information.
+  static std::pair<std::string, DemangledNameInfo>
+  TrackedDemangleSymbolAsString(llvm::StringRef symbol, DemangleMode mode,
+                                const SymbolContext *sc = nullptr,
+                                const ExecutionContext *exe_ctx = nullptr);
+
   /// Demangle a symbol to a swift::Demangle node tree.
   ///
   /// This is a central point of access, for purposes such as logging.
@@ -885,6 +907,11 @@ class SwiftLanguageRuntime : public LanguageRuntime {
 
   /// Swift native NSError isa.
   std::optional<lldb::addr_t> m_SwiftNativeNSErrorISA;
+
+  static std::pair<std::string, std::optional<DemangledNameInfo>>
+  DemangleSymbolAsString(llvm::StringRef symbol, DemangleMode mode,
+                         bool tracking, const SymbolContext *sc,
+                         const ExecutionContext *exe_ctx);
 };
 
 /// The target specific register numbers used for async unwinding.