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//===--- 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 and
// -Werror.
//
// Warning options control the handling of the warnings that Clang emits. There
// are three possible reactions to any given warning:
// ignore: Do nothing
// warn: Emit a message, but don't fail the compilation
// error: Emit a message and fail the compilation
//
// Each warning option controls any number of actual warnings.
// Given a warning option 'foo', the following are valid:
// -Wfoo=ignore -> Ignore the controlled warnings.
// -Wfoo=warn -> Warn about the controlled warnings.
// -Wfoo=error -> Fail on the controlled warnings.
// -Wfoo -> alias of -Wfoo=warn
// -Wno-foo -> alias of -Wfoo=ignore
// -Werror=foo -> alias of -Wfoo=error
//
// Because of this complex handling of options, the default parser is replaced.
#include "clang/Basic/Diagnostic.h"
#include "clang/Sema/SemaDiagnostic.h"
#include "clang/Lex/LexDiagnostic.h"
#include "llvm/Support/CommandLine.h"
#include <vector>
#include <string>
#include <utility>
#include <algorithm>
#include <string.h>
using namespace clang;
namespace {
struct ParsedOption {
std::string Name;
diag::Mapping Mapping;
ParsedOption() {}
// Used by -Werror, implicitly.
ParsedOption(const std::string& name) : Name(name), Mapping(diag::MAP_ERROR)
{}
};
typedef std::vector<ParsedOption> OptionsList;
OptionsList Options;
struct WarningParser : public llvm::cl::basic_parser<ParsedOption> {
diag::Mapping StrToMapping(const std::string &S) {
if (S == "ignore")
return diag::MAP_IGNORE;
if (S == "warn")
return diag::MAP_WARNING;
if (S == "error")
return diag::MAP_ERROR;
return diag::MAP_DEFAULT;
}
bool parse(llvm::cl::Option &O, const char *ArgName,
const std::string &ArgValue, ParsedOption &Val)
{
size_t Eq = ArgValue.find("=");
if (Eq == std::string::npos) {
// Could be -Wfoo or -Wno-foo
if (ArgValue.compare(0, 3, "no-") == 0) {
Val.Name = ArgValue.substr(3);
Val.Mapping = diag::MAP_IGNORE;
} else {
Val.Name = ArgValue;
Val.Mapping = diag::MAP_WARNING;
}
} else {
Val.Name = ArgValue.substr(0, Eq);
Val.Mapping = StrToMapping(ArgValue.substr(Eq+1));
if (Val.Mapping == diag::MAP_DEFAULT) {
fprintf(stderr, "Illegal warning option value: %s\n",
ArgValue.substr(Eq+1).c_str());
return true;
}
}
return false;
}
};
}
static llvm::cl::list<ParsedOption, OptionsList, WarningParser>
OptWarnings("W", llvm::cl::location(Options), llvm::cl::Prefix);
static llvm::cl::list<ParsedOption, OptionsList, llvm::cl::parser<std::string> >
OptWError("Werror", llvm::cl::location(Options), llvm::cl::CommaSeparated,
llvm::cl::ValueOptional);
static llvm::cl::opt<bool> OptPedantic("pedantic");
static llvm::cl::opt<bool> OptPedanticErrors("pedantic-errors");
static llvm::cl::opt<bool> OptNoWarnings("w");
static llvm::cl::opt<bool>
OptWarnInSystemHeaders("Wsystem-headers",
llvm::cl::desc("Do not suppress warnings issued in system headers"));
namespace {
struct WarningOption {
const char *Name;
const diag::kind *Members;
size_t NumMembers;
};
bool operator <(const WarningOption& lhs, const WarningOption& rhs) {
return strcmp(lhs.Name, rhs.Name) < 0;
}
}
#define DIAGS(a) a, (sizeof(a) / sizeof(a[0]))
// These tables will be TableGenerated later.
// First the table sets describing the diagnostics controlled by each option.
static const diag::kind UnusedMacrosDiags[] = { diag::pp_macro_not_used };
static const diag::kind FloatEqualDiags[] = { diag::warn_floatingpoint_eq };
static const diag::kind ReadOnlySetterAttrsDiags[] = {
diag::warn_objc_property_attr_mutually_exclusive
};
static const diag::kind FormatNonLiteralDiags[] = {
diag::warn_printf_not_string_constant
};
static const diag::kind UndefDiags[] = { diag::warn_pp_undef_identifier };
static const diag::kind ImplicitFunctionDeclarationDiags[] = {
diag::ext_implicit_function_decl, diag::warn_implicit_function_decl
};
static const diag::kind PointerSignDiags[] = {
diag::ext_typecheck_convert_incompatible_pointer_sign
};
static const diag::kind DeprecatedDeclarations[] = { diag::warn_deprecated };
static const diag::kind MissingPrototypesDiags[] = {
diag::warn_missing_prototype
};
// Hmm ... this option is currently actually completely ignored.
//static const diag::kind StrictSelectorMatchDiags[] = { };
// Second the table of options. MUST be sorted by name! Binary lookup is done.
static const WarningOption OptionTable[] = {
{ "deprecated-declarations", DIAGS(DeprecatedDeclarations) },
{ "float-equal", DIAGS(FloatEqualDiags) },
{ "format-nonliteral", DIAGS(FormatNonLiteralDiags) },
{ "implicit-function-declaration", DIAGS(ImplicitFunctionDeclarationDiags) },
{ "missing-prototypes", DIAGS(MissingPrototypesDiags) },
{ "pointer-sign", DIAGS(PointerSignDiags) },
{ "readonly-setter-attrs", DIAGS(ReadOnlySetterAttrsDiags) },
{ "undef", DIAGS(UndefDiags) },
{ "unused-macros", DIAGS(UnusedMacrosDiags) },
// { "strict-selector-match", DIAGS(StrictSelectorMatchDiags) }
};
static const size_t OptionTableSize =
sizeof(OptionTable) / sizeof(OptionTable[0]);
namespace clang {
bool ProcessWarningOptions(Diagnostic &Diags) {
// FIXME: These should be mapped to group options.
Diags.setIgnoreAllWarnings(OptNoWarnings);
Diags.setWarnOnExtensions(OptPedantic);
Diags.setErrorOnExtensions(OptPedanticErrors);
// Set some defaults that are currently set manually. This, too, should
// be in the tablegen stuff later.
Diags.setDiagnosticMapping(diag::pp_macro_not_used, diag::MAP_IGNORE);
Diags.setDiagnosticMapping(diag::warn_floatingpoint_eq, diag::MAP_IGNORE);
Diags.setDiagnosticMapping(diag::warn_objc_property_attr_mutually_exclusive,
diag::MAP_IGNORE);
Diags.setDiagnosticMapping(diag::warn_pp_undef_identifier, diag::MAP_IGNORE);
Diags.setDiagnosticMapping(diag::warn_implicit_function_decl,
diag::MAP_IGNORE);
Diags.setDiagnosticMapping(diag::err_pp_file_not_found, diag::MAP_FATAL);
Diags.setDiagnosticMapping(diag::err_template_recursion_depth_exceeded,
diag::MAP_FATAL);
Diags.setDiagnosticMapping(diag::warn_missing_prototype, diag::MAP_IGNORE);
Diags.setSuppressSystemWarnings(!OptWarnInSystemHeaders);
for (OptionsList::iterator it = Options.begin(), e = Options.end();
it != e; ++it) {
if (it->Name.empty()) {
// Empty string is "everything". This way, -Werror does the right thing.
// FIXME: These flags do not participate in proper option overriding.
switch(it->Mapping) {
default:
assert(false && "Illegal mapping");
break;
case diag::MAP_IGNORE:
Diags.setIgnoreAllWarnings(true);
Diags.setWarningsAsErrors(false);
break;
case diag::MAP_WARNING:
Diags.setIgnoreAllWarnings(false);
Diags.setWarningsAsErrors(false);
break;
case diag::MAP_ERROR:
Diags.setIgnoreAllWarnings(false);
Diags.setWarningsAsErrors(true);
break;
}
continue;
}
WarningOption Key = { it->Name.c_str(), 0, 0 };
const WarningOption *Found = std::lower_bound(OptionTable,
OptionTable + OptionTableSize,
Key);
if (Found == OptionTable + OptionTableSize ||
strcmp(Found->Name, Key.Name) != 0) {
fprintf(stderr, "Unknown warning option: -W%s\n", Key.Name);
return true;
}
// Option exists.
for (size_t i = 0; i < Found->NumMembers; ++i) {
Diags.setDiagnosticMapping(Found->Members[i], it->Mapping);
}
}
return false;
}
}
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