DiagnosticIDs.cpp

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//===--- DiagnosticIDs.cpp - Diagnostic IDs Handling ----------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
//  This file implements the Diagnostic IDs-related interfaces.
//
//===----------------------------------------------------------------------===//
 
#include "clang/Basic/DiagnosticIDs.h"
#include "clang/Basic/AllDiagnostics.h"
#include "clang/Basic/DiagnosticCategories.h"
#include "clang/Basic/SourceManager.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringTable.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Path.h"
#include <map>
#include <optional>
using namespace clang;
 
//===----------------------------------------------------------------------===//
// Builtin Diagnostic information
//===----------------------------------------------------------------------===//
 
namespace {
 
struct StaticDiagInfoRec;
 
// Store the descriptions in a separate table to avoid pointers that need to
// be relocated, and also decrease the amount of data needed on 64-bit
// platforms. See "How To Write Shared Libraries" by Ulrich Drepper.
struct StaticDiagInfoDescriptionStringTable {
#define DIAG(ENUM, CLASS, DEFAULT_SEVERITY, DESC, GROUP, SFINAE, NOWERROR,     \
             SHOWINSYSHEADER, SHOWINSYSMACRO, DEFERRABLE, CATEGORY)            \
  char ENUM##_desc[sizeof(DESC)];
#include "clang/Basic/AllDiagnosticKinds.inc"
#undef DIAG
};
 
const StaticDiagInfoDescriptionStringTable StaticDiagInfoDescriptions = {
#define DIAG(ENUM, CLASS, DEFAULT_SEVERITY, DESC, GROUP, SFINAE, NOWERROR,     \
             SHOWINSYSHEADER, SHOWINSYSMACRO, DEFERRABLE, CATEGORY)            \
  DESC,
#include "clang/Basic/AllDiagnosticKinds.inc"
#undef DIAG
};
 
extern const StaticDiagInfoRec StaticDiagInfo[];
 
// Stored separately from StaticDiagInfoRec to pack better.  Otherwise,
// StaticDiagInfoRec would have extra padding on 64-bit platforms.
const uint32_t StaticDiagInfoDescriptionOffsets[] = {
#define DIAG(ENUM, CLASS, DEFAULT_SEVERITY, DESC, GROUP, SFINAE, NOWERROR,     \
             SHOWINSYSHEADER, SHOWINSYSMACRO, DEFERRABLE, CATEGORY)            \
  offsetof(StaticDiagInfoDescriptionStringTable, ENUM##_desc),
#include "clang/Basic/AllDiagnosticKinds.inc"
#undef DIAG
};
 
// Diagnostic classes.
enum DiagnosticClass {
  CLASS_NOTE       = 0x01,
  CLASS_REMARK     = 0x02,
  CLASS_WARNING    = 0x03,
  CLASS_EXTENSION  = 0x04,
  CLASS_ERROR      = 0x05
};
 
struct StaticDiagInfoRec {
  uint16_t DiagID;
  LLVM_PREFERRED_TYPE(diag::Severity)
  uint8_t DefaultSeverity : 3;
  LLVM_PREFERRED_TYPE(DiagnosticClass)
  uint8_t Class : 3;
  LLVM_PREFERRED_TYPE(DiagnosticIDs::SFINAEResponse)
  uint8_t SFINAE : 2;
  uint8_t Category : 6;
  LLVM_PREFERRED_TYPE(bool)
  uint8_t WarnNoWerror : 1;
  LLVM_PREFERRED_TYPE(bool)
  uint8_t WarnShowInSystemHeader : 1;
  LLVM_PREFERRED_TYPE(bool)
  uint8_t WarnShowInSystemMacro : 1;
 
  uint16_t OptionGroupIndex : 15;
  LLVM_PREFERRED_TYPE(bool)
  uint16_t Deferrable : 1;
 
  uint16_t DescriptionLen;
 
  unsigned getOptionGroupIndex() const {
    return OptionGroupIndex;
  }
 
  StringRef getDescription() const {
    size_t MyIndex = this - &StaticDiagInfo[0];
    uint32_t StringOffset = StaticDiagInfoDescriptionOffsets[MyIndex];
    const char* Table = reinterpret_cast<const char*>(&StaticDiagInfoDescriptions);
    return StringRef(&Table[StringOffset], DescriptionLen);
  }
 
  diag::Flavor getFlavor() const {
    return Class == CLASS_REMARK ? diag::Flavor::Remark
                                 : diag::Flavor::WarningOrError;
  }
 
  bool operator<(const StaticDiagInfoRec &RHS) const {
    return DiagID < RHS.DiagID;
  }
};
 
#define STRINGIFY_NAME(NAME) #NAME
#define VALIDATE_DIAG_SIZE(NAME)                                               \
  static_assert(                                                               \
      static_cast<unsigned>(diag::NUM_BUILTIN_##NAME##_DIAGNOSTICS) <          \
          static_cast<unsigned>(diag::DIAG_START_##NAME) +                     \
              static_cast<unsigned>(diag::DIAG_SIZE_##NAME),                   \
      STRINGIFY_NAME(                                                          \
          DIAG_SIZE_##NAME) " is insufficient to contain all "                 \
                            "diagnostics, it may need to be made larger in "   \
                            "DiagnosticIDs.h.");
VALIDATE_DIAG_SIZE(COMMON)
VALIDATE_DIAG_SIZE(DRIVER)
VALIDATE_DIAG_SIZE(FRONTEND)
VALIDATE_DIAG_SIZE(SERIALIZATION)
VALIDATE_DIAG_SIZE(LEX)
VALIDATE_DIAG_SIZE(PARSE)
VALIDATE_DIAG_SIZE(AST)
VALIDATE_DIAG_SIZE(COMMENT)
VALIDATE_DIAG_SIZE(CROSSTU)
VALIDATE_DIAG_SIZE(SEMA)
VALIDATE_DIAG_SIZE(ANALYSIS)
VALIDATE_DIAG_SIZE(REFACTORING)
VALIDATE_DIAG_SIZE(INSTALLAPI)
#undef VALIDATE_DIAG_SIZE
#undef STRINGIFY_NAME
 
const StaticDiagInfoRec StaticDiagInfo[] = {
// clang-format off
#define DIAG(ENUM, CLASS, DEFAULT_SEVERITY, DESC, GROUP, SFINAE, NOWERROR,     \
             SHOWINSYSHEADER, SHOWINSYSMACRO, DEFERRABLE, CATEGORY)            \
  {                                                                            \
      diag::ENUM,                                                              \
      DEFAULT_SEVERITY,                                                        \
      CLASS,                                                                   \
      DiagnosticIDs::SFINAE,                                                   \
      CATEGORY,                                                                \
      NOWERROR,                                                                \
      SHOWINSYSHEADER,                                                         \
      SHOWINSYSMACRO,                                                          \
      GROUP,                                                                   \
      DEFERRABLE,                                                              \
      STR_SIZE(DESC, uint16_t)},
#include "clang/Basic/DiagnosticCommonKinds.inc"
#include "clang/Basic/DiagnosticDriverKinds.inc"
#include "clang/Basic/DiagnosticFrontendKinds.inc"
#include "clang/Basic/DiagnosticSerializationKinds.inc"
#include "clang/Basic/DiagnosticLexKinds.inc"
#include "clang/Basic/DiagnosticParseKinds.inc"
#include "clang/Basic/DiagnosticASTKinds.inc"
#include "clang/Basic/DiagnosticCommentKinds.inc"
#include "clang/Basic/DiagnosticCrossTUKinds.inc"
#include "clang/Basic/DiagnosticSemaKinds.inc"
#include "clang/Basic/DiagnosticAnalysisKinds.inc"
#include "clang/Basic/DiagnosticRefactoringKinds.inc"
#include "clang/Basic/DiagnosticInstallAPIKinds.inc"
// clang-format on
#undef DIAG
};
 
} // namespace
 
static const unsigned StaticDiagInfoSize = std::size(StaticDiagInfo);
 
/// GetDiagInfo - Return the StaticDiagInfoRec entry for the specified DiagID,
/// or null if the ID is invalid.
static const StaticDiagInfoRec *GetDiagInfo(unsigned DiagID) {
  // Out of bounds diag. Can't be in the table.
  using namespace diag;
  if (DiagID >= DIAG_UPPER_LIMIT || DiagID <= DIAG_START_COMMON)
    return nullptr;
 
  // Compute the index of the requested diagnostic in the static table.
  // 1. Add the number of diagnostics in each category preceding the
  //    diagnostic and of the category the diagnostic is in. This gives us
  //    the offset of the category in the table.
  // 2. Subtract the number of IDs in each category from our ID. This gives us
  //    the offset of the diagnostic in the category.
  // This is cheaper than a binary search on the table as it doesn't touch
  // memory at all.
  unsigned Offset = 0;
  unsigned ID = DiagID - DIAG_START_COMMON - 1;
#define CATEGORY(NAME, PREV) \
  if (DiagID > DIAG_START_##NAME) { \
    Offset += NUM_BUILTIN_##PREV##_DIAGNOSTICS - DIAG_START_##PREV - 1; \
    ID -= DIAG_START_##NAME - DIAG_START_##PREV; \
  }
CATEGORY(DRIVER, COMMON)
CATEGORY(FRONTEND, DRIVER)
CATEGORY(SERIALIZATION, FRONTEND)
CATEGORY(LEX, SERIALIZATION)
CATEGORY(PARSE, LEX)
CATEGORY(AST, PARSE)
CATEGORY(COMMENT, AST)
CATEGORY(CROSSTU, COMMENT)
CATEGORY(SEMA, CROSSTU)
CATEGORY(ANALYSIS, SEMA)
CATEGORY(REFACTORING, ANALYSIS)
CATEGORY(INSTALLAPI, REFACTORING)
#undef CATEGORY
 
  // Avoid out of bounds reads.
  if (ID + Offset >= StaticDiagInfoSize)
    return nullptr;
 
  assert(ID < StaticDiagInfoSize && Offset < StaticDiagInfoSize);
 
  const StaticDiagInfoRec *Found = &StaticDiagInfo[ID + Offset];
  // If the diag id doesn't match we found a different diag, abort. This can
  // happen when this function is called with an ID that points into a hole in
  // the diagID space.
  if (Found->DiagID != DiagID)
    return nullptr;
  return Found;
}
 
DiagnosticMapping DiagnosticIDs::getDefaultMapping(unsigned DiagID) {
  DiagnosticMapping Info = DiagnosticMapping::Make(
      diag::Severity::Fatal, /*IsUser=*/false, /*IsPragma=*/false);
 
  if (const StaticDiagInfoRec *StaticInfo = GetDiagInfo(DiagID)) {
    Info.setSeverity((diag::Severity)StaticInfo->DefaultSeverity);
 
    if (StaticInfo->WarnNoWerror) {
      assert(Info.getSeverity() == diag::Severity::Warning &&
             "Unexpected mapping with no-Werror bit!");
      Info.setNoWarningAsError(true);
    }
  }
 
  return Info;
}
 
/// getCategoryNumberForDiag - Return the category number that a specified
/// DiagID belongs to, or 0 if no category.
unsigned DiagnosticIDs::getCategoryNumberForDiag(unsigned DiagID) {
  if (const StaticDiagInfoRec *Info = GetDiagInfo(DiagID))
    return Info->Category;
  return 0;
}
 
namespace {
  // The diagnostic category names.
  struct StaticDiagCategoryRec {
    const char *NameStr;
    uint8_t NameLen;
 
    StringRef getName() const {
      return StringRef(NameStr, NameLen);
    }
  };
}
 
static const StaticDiagCategoryRec CategoryNameTable[] = {
#define GET_CATEGORY_TABLE
#define CATEGORY(X, ENUM) { X, STR_SIZE(X, uint8_t) },
#include "clang/Basic/DiagnosticGroups.inc"
#undef GET_CATEGORY_TABLE
  { nullptr, 0 }
};
 
/// getNumberOfCategories - Return the number of categories
unsigned DiagnosticIDs::getNumberOfCategories() {
  return std::size(CategoryNameTable) - 1;
}
 
/// getCategoryNameFromID - Given a category ID, return the name of the
/// category, an empty string if CategoryID is zero, or null if CategoryID is
/// invalid.
StringRef DiagnosticIDs::getCategoryNameFromID(unsigned CategoryID) {
  if (CategoryID >= getNumberOfCategories())
   return StringRef();
  return CategoryNameTable[CategoryID].getName();
}
 
 
 
DiagnosticIDs::SFINAEResponse
DiagnosticIDs::getDiagnosticSFINAEResponse(unsigned DiagID) {
  if (const StaticDiagInfoRec *Info = GetDiagInfo(DiagID))
    return static_cast<DiagnosticIDs::SFINAEResponse>(Info->SFINAE);
  return SFINAE_Report;
}
 
bool DiagnosticIDs::isDeferrable(unsigned DiagID) {
  if (const StaticDiagInfoRec *Info = GetDiagInfo(DiagID))
    return Info->Deferrable;
  return false;
}
 
/// getBuiltinDiagClass - Return the class field of the diagnostic.
///
static unsigned getBuiltinDiagClass(unsigned DiagID) {
  if (const StaticDiagInfoRec *Info = GetDiagInfo(DiagID))
    return Info->Class;
  return ~0U;
}
 
//===----------------------------------------------------------------------===//
// Custom Diagnostic information
//===----------------------------------------------------------------------===//
 
namespace clang {
  namespace diag {
    class CustomDiagInfo {
      typedef std::pair<DiagnosticIDs::Level, std::string> DiagDesc;
      std::vector<DiagDesc> DiagInfo;
      std::map<DiagDesc, unsigned> DiagIDs;
    public:
 
      /// getDescription - Return the description of the specified custom
      /// diagnostic.
      StringRef getDescription(unsigned DiagID) const {
        assert(DiagID - DIAG_UPPER_LIMIT < DiagInfo.size() &&
               "Invalid diagnostic ID");
        return DiagInfo[DiagID-DIAG_UPPER_LIMIT].second;
      }
 
      /// getLevel - Return the level of the specified custom diagnostic.
      DiagnosticIDs::Level getLevel(unsigned DiagID) const {
        assert(DiagID - DIAG_UPPER_LIMIT < DiagInfo.size() &&
               "Invalid diagnostic ID");
        return DiagInfo[DiagID-DIAG_UPPER_LIMIT].first;
      }
 
      unsigned getOrCreateDiagID(DiagnosticIDs::Level L, StringRef Message,
                                 DiagnosticIDs &Diags) {
        DiagDesc D(L, std::string(Message));
        // Check to see if it already exists.
        std::map<DiagDesc, unsigned>::iterator I = DiagIDs.lower_bound(D);
        if (I != DiagIDs.end() && I->first == D)
          return I->second;
 
        // If not, assign a new ID.
        unsigned ID = DiagInfo.size()+DIAG_UPPER_LIMIT;
        DiagIDs.insert(std::make_pair(D, ID));
        DiagInfo.push_back(D);
        return ID;
      }
    };
 
  } // end diag namespace
} // end clang namespace
 
 
//===----------------------------------------------------------------------===//
// Common Diagnostic implementation
//===----------------------------------------------------------------------===//
 
DiagnosticIDs::DiagnosticIDs() {}
 
DiagnosticIDs::~DiagnosticIDs() {}
 
/// getCustomDiagID - Return an ID for a diagnostic with the specified message
/// and level.  If this is the first request for this diagnostic, it is
/// registered and created, otherwise the existing ID is returned.
///
/// \param FormatString A fixed diagnostic format string that will be hashed and
/// mapped to a unique DiagID.
unsigned