Coverage Report

Created: 2017-10-03 07:32

/Users/buildslave/jenkins/sharedspace/clang-stage2-coverage-R@2/llvm/tools/clang/lib/Basic/Warnings.cpp
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Source (jump to first uncovered line)
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//===--- Warnings.cpp - C-Language Front-end ------------------------------===//
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//
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//                     The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Command line warning options handler.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is responsible for handling all warning options. This includes
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// a number of -Wfoo options and their variants, which are driven by TableGen-
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// generated data, and the special cases -pedantic, -pedantic-errors, -w,
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// -Werror and -Wfatal-errors.
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//
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// Each warning option controls any number of actual warnings.
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// Given a warning option 'foo', the following are valid:
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//    -Wfoo, -Wno-foo, -Werror=foo, -Wfatal-errors=foo
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//
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// Remark options are also handled here, analogously, except that they are much
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// simpler because a remark can't be promoted to an error.
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#include "clang/Basic/AllDiagnostics.h"
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#include "clang/Basic/Diagnostic.h"
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#include "clang/Basic/DiagnosticOptions.h"
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#include <algorithm>
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#include <cstring>
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#include <utility>
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using namespace clang;
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// EmitUnknownDiagWarning - Emit a warning and typo hint for unknown warning
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// opts
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static void EmitUnknownDiagWarning(DiagnosticsEngine &Diags,
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                                   diag::Flavor Flavor, StringRef Prefix,
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15
                                   StringRef Opt) {
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15
  StringRef Suggestion = DiagnosticIDs::getNearestOption(Flavor, Opt);
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  Diags.Report(diag::warn_unknown_diag_option)
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15
    << (Flavor == diag::Flavor::WarningOrError ? 
013
:
12
) << (Prefix.str() += Opt)
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15
    << !Suggestion.empty() << (Prefix.str() += Suggestion);
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15
}
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void clang::ProcessWarningOptions(DiagnosticsEngine &Diags,
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                                  const DiagnosticOptions &Opts,
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71.0k
                                  bool ReportDiags) {
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71.0k
  Diags.setSuppressSystemWarnings(true);  // Default to -Wno-system-headers
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71.0k
  Diags.setIgnoreAllWarnings(Opts.IgnoreWarnings);
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71.0k
  Diags.setShowOverloads(Opts.getShowOverloads());
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71.0k
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71.0k
  Diags.setElideType(Opts.ElideType);
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71.0k
  Diags.setPrintTemplateTree(Opts.ShowTemplateTree);
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71.0k
  Diags.setShowColors(Opts.ShowColors);
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71.0k
 
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71.0k
  // Handle -ferror-limit
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71.0k
  if (Opts.ErrorLimit)
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24.8k
    Diags.setErrorLimit(Opts.ErrorLimit);
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71.0k
  if (Opts.TemplateBacktraceLimit)
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71.0k
    Diags.setTemplateBacktraceLimit(Opts.TemplateBacktraceLimit);
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71.0k
  if (Opts.ConstexprBacktraceLimit)
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71.0k
    Diags.setConstexprBacktraceLimit(Opts.ConstexprBacktraceLimit);
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71.0k
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71.0k
  // If -pedantic or -pedantic-errors was specified, then we want to map all
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71.0k
  // extension diagnostics onto WARNING or ERROR unless the user has futz'd
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71.0k
  // around with them explicitly.
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71.0k
  if (Opts.PedanticErrors)
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188
    Diags.setExtensionHandlingBehavior(diag::Severity::Error);
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70.9k
  else 
if (70.9k
Opts.Pedantic70.9k
)
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375
    Diags.setExtensionHandlingBehavior(diag::Severity::Warning);
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70.9k
  else
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70.5k
    Diags.setExtensionHandlingBehavior(diag::Severity::Ignored);
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71.0k
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71.0k
  SmallVector<diag::kind, 10> _Diags;
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71.0k
  const IntrusiveRefCntPtr< DiagnosticIDs > DiagIDs =
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71.0k
    Diags.getDiagnosticIDs();
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71.0k
  // We parse the warning options twice.  The first pass sets diagnostic state,
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71.0k
  // while the second pass reports warnings/errors.  This has the effect that
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71.0k
  // we follow the more canonical "last option wins" paradigm when there are 
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71.0k
  // conflicting options.
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183k
  for (unsigned Report = 0, ReportEnd = 2; 
Report != ReportEnd183k
;
++Report112k
) {
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    bool SetDiagnostic = (Report == 0);
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142k
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142k
    // If we've set the diagnostic state and are not reporting diagnostics then
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    // we're done.
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142k
    if (
!SetDiagnostic && 142k
!ReportDiags71.0k
)
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      break;
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112k
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291k
    
for (unsigned i = 0, e = Opts.Warnings.size(); 112k
i != e291k
;
++i178k
) {
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178k
      const auto Flavor = diag::Flavor::WarningOrError;
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178k
      StringRef Opt = Opts.Warnings[i];
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178k
      StringRef OrigOpt = Opts.Warnings[i];
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178k
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178k
      // Treat -Wformat=0 as an alias for -Wno-format.
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178k
      if (Opt == "format=0")
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2
        Opt = "no-format";
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178k
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178k
      // Check to see if this warning starts with "no-", if so, this is a
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178k
      // negative form of the option.
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178k
      bool isPositive = true;
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178k
      if (
Opt.startswith("no-")178k
) {
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15.0k
        isPositive = false;
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15.0k
        Opt = Opt.substr(3);
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15.0k
      }
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178k
105
178k
      // Figure out how this option affects the warning.  If -Wfoo, map the
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178k
      // diagnostic to a warning, if -Wno-foo, map it to ignore.
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178k
      diag::Severity Mapping =
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178k
          isPositive ? 
diag::Severity::Warning163k
:
diag::Severity::Ignored15.0k
;
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178k
      // -Wsystem-headers is a special case, not driven by the option table.  It
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178k
      // cannot be controlled with -Werror.
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178k
      if (
Opt == "system-headers"178k
) {
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        if (SetDiagnostic)
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18
          Diags.setSuppressSystemWarnings(!isPositive);
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        continue;
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      }
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178k
      
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178k
      // -Weverything is a special case as well.  It implicitly enables all
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178k
      // warnings, including ones not explicitly in a warning group.
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178k
      
if (178k
Opt == "everything"178k
) {
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64
        if (
SetDiagnostic64
) {
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34
          if (
isPositive34
) {
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18
            Diags.setEnableAllWarnings(true);
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34
          } else {
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16
            Diags.setEnableAllWarnings(false);
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16
            Diags.setSeverityForAll(Flavor, diag::Severity::Ignored);
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16
          }
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34
        }
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64
        continue;
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64
      }
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178k
      // -Werror/-Wno-error is a special case, not controlled by the option 
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178k
      // table. It also has the "specifier" form of -Werror=foo and -Werror-foo.
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178k
      
if (178k
Opt.startswith("error")178k
) {
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105k
        StringRef Specifier;
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105k
        if (
Opt.size() > 5105k
) { // Specifier must be present.
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104k
          if (
(Opt[5] != '=' && 104k
Opt[5] != '-'10
) ||
Opt.size() == 6104k
) {
138
0
            if (Report)
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0
              Diags.Report(diag::warn_unknown_warning_specifier)
140
0
                << "-Werror" << ("-W" + OrigOpt.str());
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0
            continue;
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0
          }
143
104k
          Specifier = Opt.substr(6);
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104k
        }
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105k
        
146
105k
        
if (105k
Specifier.empty()105k
) {
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924
          if (SetDiagnostic)
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532
            Diags.setWarningsAsErrors(isPositive);
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924
          continue;
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924
        }
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104k
        
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104k
        
if (104k
SetDiagnostic104k
) {
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58.9k
          // Set the warning as error flag for this specifier.
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58.9k
          Diags.setDiagnosticGroupWarningAsError(Specifier, isPositive);
155
104k
        } else 
if (45.7k
DiagIDs->getDiagnosticsInGroup(Flavor, Specifier, _Diags)45.7k
) {
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0
          EmitUnknownDiagWarning(Diags, Flavor, "-Werror=", Specifier);
157
0
        }
158
105k
        continue;
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105k
      }
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73.1k
      
161
73.1k
      // -Wfatal-errors is yet another special case.
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73.1k
      
if (73.1k
Opt.startswith("fatal-errors")73.1k
) {
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6
        StringRef Specifier;
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6
        if (
Opt.size() != 126
) {
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2
          if (
(Opt[12] != '=' && 2
Opt[12] != '-'0
) ||
Opt.size() == 132
) {
166
0
            if (Report)
167
0
              Diags.Report(diag::warn_unknown_warning_specifier)
168
0
                << "-Wfatal-errors" << ("-W" + OrigOpt.str());
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0
            continue;
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0
          }
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2
          Specifier = Opt.substr(13);
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2
        }
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6
174
6
        
if (6
Specifier.empty()6
) {
175
4
          if (SetDiagnostic)
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2
            Diags.setErrorsAsFatal(isPositive);
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4
          continue;
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4
        }
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2
        
180
2
        
if (2
SetDiagnostic2
) {
181
1
          // Set the error as fatal flag for this specifier.
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1
          Diags.setDiagnosticGroupErrorAsFatal(Specifier, isPositive);
183
2
        } else 
if (1
DiagIDs->getDiagnosticsInGroup(Flavor, Specifier, _Diags)1
) {
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0
          EmitUnknownDiagWarning(Diags, Flavor, "-Wfatal-errors=", Specifier);
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0
        }
186
6
        continue;
187
6
      }
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73.1k
      
189
73.1k
      
if (73.1k
Report73.1k
) {
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33.0k
        if (DiagIDs->getDiagnosticsInGroup(Flavor, Opt, _Diags))
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13
          
EmitUnknownDiagWarning(Diags, Flavor, isPositive ? 13
"-W"11
:
"-Wno-"2
,
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13
                                 Opt);
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73.1k
      } else {
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40.0k
        Diags.setSeverityForGroup(Flavor, Opt, Mapping);
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40.0k
      }
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178k
    }
197
112k
198
112k
    for (unsigned i = 0, e = Opts.Remarks.size(); 
i != e112k
;
++i318
) {
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      StringRef Opt = Opts.Remarks[i];
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      const auto Flavor = diag::Flavor::Remark;
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318
202
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      // Check to see if this warning starts with "no-", if so, this is a
203
318
      // negative form of the option.
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318
      bool IsPositive = !Opt.startswith("no-");
205
318
      if (
!IsPositive318
)
Opt = Opt.substr(3)13
;
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318
207
305
      auto Severity = IsPositive ? diag::Severity::Remark
208
13
                                 : diag::Severity::Ignored;
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318
210
318
      // -Reverything sets the state of all remarks. Note that all remarks are
211
318
      // in remark groups, so we don't need a separate 'all remarks enabled'
212
318
      // flag.
213
318
      if (
Opt == "everything"318
) {
214
24
        if (SetDiagnostic)
215
15
          Diags.setSeverityForAll(Flavor, Severity);
216
24
        continue;
217
24
      }
218
294
219
294
      
if (294
Report294
) {
220
121
        if (DiagIDs->getDiagnosticsInGroup(Flavor, Opt, _Diags))
221
2
          
EmitUnknownDiagWarning(Diags, Flavor, IsPositive ? 2
"-R"1
:
"-Rno-"1
,
222
2
                                 Opt);
223
294
      } else {
224
173
        Diags.setSeverityForGroup(Flavor, Opt,
225
171
                                  IsPositive ? diag::Severity::Remark
226
2
                                             : diag::Severity::Ignored);
227
173
      }
228
318
    }
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142k
  }
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71.0k
}