//===--- Diagnostic.cpp - C Language Family Diagnostic Handling -----------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//  This file implements the Diagnostic-related interfaces.
//
//===----------------------------------------------------------------------===//

#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/SourceLocation.h"
#include <cassert>
using namespace llvm;
using namespace clang;

/// Flag values for diagnostics.
enum {
  // Diagnostic classes.
  NOTE       = 0x01,
  WARNING    = 0x02,
  EXTENSION  = 0x03,
  ERROR      = 0x04,
  FATAL      = 0x05,
  class_mask = 0x07
};

/// DiagnosticFlags - A set of flags, or'd together, that describe the
/// diagnostic.
static unsigned char DiagnosticFlags[] = {
#define DIAG(ENUM,FLAGS,DESC) FLAGS,
#include "clang/Basic/DiagnosticKinds.def"
  0
};

/// getDiagClass - Return the class field of the diagnostic.
///
static unsigned getDiagClass(unsigned DiagID) {
  assert(DiagID < diag::NUM_DIAGNOSTICS && "Diagnostic ID out of range!");
  return DiagnosticFlags[DiagID] & class_mask;
}

/// DiagnosticText - An english message to print for the diagnostic.  These
/// should be localized.
static const char * const DiagnosticText[] = {
#define DIAG(ENUM,FLAGS,DESC) DESC,
#include "clang/Basic/DiagnosticKinds.def"
  0
};

Diagnostic::Diagnostic(DiagnosticClient &client) : Client(client) {
  WarningsAsErrors = false;
  WarnOnExtensions = false;
  ErrorOnExtensions = false;
  // Clear all mappings, setting them to MAP_DEFAULT.
  memset(DiagMappings, 0, sizeof(DiagMappings));
}

/// isNoteWarningOrExtension - Return true if the unmapped diagnostic level of
/// the specified diagnostic ID is a Note, Warning, or Extension.
bool Diagnostic::isNoteWarningOrExtension(unsigned DiagID) {
  return getDiagClass(DiagID) < ERROR;
}


/// getDescription - Given a diagnostic ID, return a description of the
/// issue.
const char *Diagnostic::getDescription(unsigned DiagID) {
  assert(DiagID < diag::NUM_DIAGNOSTICS && "Diagnostic ID out of range!");
  return DiagnosticText[DiagID];
}

/// getDiagnosticLevel - Based on the way the client configured the Diagnostic
/// object, classify the specified diagnostic ID into a Level, consumable by
/// the DiagnosticClient.
Diagnostic::Level Diagnostic::getDiagnosticLevel(unsigned DiagID) const {
  unsigned DiagClass = getDiagClass(DiagID);
  
  // Specific non-error diagnostics may be mapped to various levels from ignored
  // to error.
  if (DiagClass < ERROR) {
    switch (getDiagnosticMapping((diag::kind)DiagID)) {
    case diag::MAP_DEFAULT: break;
    case diag::MAP_IGNORE:  return Ignored;
    case diag::MAP_WARNING: DiagClass = WARNING; break;
    case diag::MAP_ERROR:   DiagClass = ERROR; break;
    }
  }
  
  // Map diagnostic classes based on command line argument settings.
  if (DiagClass == EXTENSION) {
    if (ErrorOnExtensions)
      DiagClass = ERROR;
    else if (WarnOnExtensions)
      DiagClass = WARNING;
    else
      return Ignored;
  }
  
  // If warnings are to be treated as errors, indicate this as such.
  if (DiagClass == WARNING && WarningsAsErrors)
    DiagClass = ERROR;
  
  switch (DiagClass) {
  default: assert(0 && "Unknown diagnostic class!");
  case NOTE:        return Diagnostic::Note;
  case WARNING:     return Diagnostic::Warning;
  case ERROR:       return Diagnostic::Error;
  case FATAL:       return Diagnostic::Fatal;
  }
}

/// Report - Issue the message to the client. If the client wants us to stop
/// compilation, return true, otherwise return false.  DiagID is a member of
/// the diag::kind enum.  
void Diagnostic::Report(SourceLocation Pos, unsigned DiagID,
                        const std::string *Strs, unsigned NumStrs,
                        const SourceRange *Ranges, unsigned NumRanges) {
  // Figure out the diagnostic level of this message.
  Diagnostic::Level DiagLevel = getDiagnosticLevel(DiagID);
  
  // If the client doesn't care about this message, don't issue it.
  if (DiagLevel == Diagnostic::Ignored)
    return;
  
  // Finally, report it.
  Client.HandleDiagnostic(DiagLevel, Pos, (diag::kind)DiagID, Strs, NumStrs,
                          Ranges, NumRanges);
}

DiagnosticClient::~DiagnosticClient() {}
