| //===--- Warnings.cpp - C-Language Front-end ------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // Command line warning options handler. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file is responsible for handling all warning options. This includes |
| // a number of -Wfoo options and their variants, which are driven by TableGen- |
| // generated data, and the special cases -pedantic, -pedantic-errors, -w, |
| // -Werror and -Wfatal-errors. |
| // |
| // Each warning option controls any number of actual warnings. |
| // Given a warning option 'foo', the following are valid: |
| // -Wfoo, -Wno-foo, -Werror=foo, -Wfatal-errors=foo |
| // |
| #include "clang/Frontend/Utils.h" |
| #include "clang/Basic/Diagnostic.h" |
| #include "clang/Sema/SemaDiagnostic.h" |
| #include "clang/Lex/LexDiagnostic.h" |
| #include "clang/Frontend/DiagnosticOptions.h" |
| #include "clang/Frontend/FrontendDiagnostic.h" |
| #include <cstring> |
| #include <utility> |
| #include <algorithm> |
| using namespace clang; |
| |
| void clang::ProcessWarningOptions(Diagnostic &Diags, |
| const DiagnosticOptions &Opts) { |
| Diags.setSuppressSystemWarnings(true); // Default to -Wno-system-headers |
| Diags.setIgnoreAllWarnings(Opts.IgnoreWarnings); |
| |
| // If -pedantic or -pedantic-errors was specified, then we want to map all |
| // extension diagnostics onto WARNING or ERROR unless the user has futz'd |
| // around with them explicitly. |
| if (Opts.PedanticErrors) |
| Diags.setExtensionHandlingBehavior(Diagnostic::Ext_Error); |
| else if (Opts.Pedantic) |
| Diags.setExtensionHandlingBehavior(Diagnostic::Ext_Warn); |
| else |
| Diags.setExtensionHandlingBehavior(Diagnostic::Ext_Ignore); |
| |
| for (unsigned i = 0, e = Opts.Warnings.size(); i != e; ++i) { |
| const std::string &Opt = Opts.Warnings[i]; |
| const char *OptStart = &Opt[0]; |
| const char *OptEnd = OptStart+Opt.size(); |
| assert(*OptEnd == 0 && "Expect null termination for lower-bound search"); |
| |
| // Check to see if this warning starts with "no-", if so, this is a negative |
| // form of the option. |
| bool isPositive = true; |
| if (OptEnd-OptStart > 3 && memcmp(OptStart, "no-", 3) == 0) { |
| isPositive = false; |
| OptStart += 3; |
| } |
| |
| // Figure out how this option affects the warning. If -Wfoo, map the |
| // diagnostic to a warning, if -Wno-foo, map it to ignore. |
| diag::Mapping Mapping = isPositive ? diag::MAP_WARNING : diag::MAP_IGNORE; |
| |
| // -Wsystem-headers is a special case, not driven by the option table. It |
| // cannot be controlled with -Werror. |
| if (OptEnd-OptStart == 14 && memcmp(OptStart, "system-headers", 14) == 0) { |
| Diags.setSuppressSystemWarnings(!isPositive); |
| continue; |
| } |
| |
| // -Werror/-Wno-error is a special case, not controlled by the option table. |
| // It also has the "specifier" form of -Werror=foo and -Werror-foo. |
| if (OptEnd-OptStart >= 5 && memcmp(OptStart, "error", 5) == 0) { |
| const char *Specifier = 0; |
| if (OptEnd-OptStart != 5) { // Specifier must be present. |
| if ((OptStart[5] != '=' && OptStart[5] != '-') || |
| OptEnd-OptStart == 6) { |
| Diags.Report(diag::warn_unknown_warning_specifier) |
| << "-Werror" << ("-W" + Opt); |
| continue; |
| } |
| Specifier = OptStart+6; |
| } |
| |
| if (Specifier == 0) { |
| Diags.setWarningsAsErrors(isPositive); |
| continue; |
| } |
| |
| // -Werror=foo maps foo to Error, -Wno-error=foo maps it to Warning. |
| Mapping = isPositive ? diag::MAP_ERROR : diag::MAP_WARNING_NO_WERROR; |
| OptStart = Specifier; |
| } |
| |
| // -Wfatal-errors is yet another special case. |
| if (OptEnd-OptStart >= 12 && memcmp(OptStart, "fatal-errors", 12) == 0) { |
| const char* Specifier = 0; |
| if (OptEnd-OptStart != 12) { |
| if ((OptStart[12] != '=' && OptStart[12] != '-') || |
| OptEnd-OptStart == 13) { |
| Diags.Report(diag::warn_unknown_warning_specifier) |
| << "-Wfatal-errors" << ("-W" + Opt); |
| continue; |
| } |
| Specifier = OptStart + 13; |
| } |
| |
| if (Specifier == 0) { |
| Diags.setErrorsAsFatal(isPositive); |
| continue; |
| } |
| |
| // -Wfatal-errors=foo maps foo to Fatal, -Wno-fatal-errors=foo |
| // maps it to Error. |
| Mapping = isPositive ? diag::MAP_FATAL : diag::MAP_ERROR_NO_WFATAL; |
| OptStart = Specifier; |
| } |
| |
| if (Diags.setDiagnosticGroupMapping(OptStart, Mapping)) |
| Diags.Report(diag::warn_unknown_warning_option) << ("-W" + Opt); |
| } |
| } |