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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.
//
// Each warning option controls any number of actual warnings.
// Given a warning option 'foo', the following are valid:
//
// -Wfoo -> alias of -Wfoo=warn
// -Wno-foo -> alias of -Wfoo=ignore
// -Werror=foo -> alias of -Wfoo=error
//
#include "clang-cc.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Sema/SemaDiagnostic.h"
#include "clang/Lex/LexDiagnostic.h"
#include "llvm/Support/CommandLine.h"
#include <cstdio>
#include <utility>
#include <algorithm>
using namespace clang;
// This gets all -W options, including -Werror, -W[no-]system-headers, etc. The
// driver has stripped off -Wa,foo etc. The driver has also translated -W to
// -Wextra, so we don't need to worry about it.
static llvm::cl::list<std::string>
OptWarnings("W", llvm::cl::Prefix, 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");
struct WarningOption {
const char *Name;
const short *Members;
};
#define GET_DIAG_ARRAYS
#include "clang/Basic/DiagnosticGroups.inc"
#undef GET_DIAG_ARRAYS
// Second the table of options, sorted by name for fast binary lookup.
static const WarningOption OptionTable[] = {
#define GET_DIAG_TABLE
#include "clang/Basic/DiagnosticGroups.inc"
#undef GET_DIAG_TABLE
};
static const size_t OptionTableSize =
sizeof(OptionTable) / sizeof(OptionTable[0]);
static bool WarningOptionCompare(const WarningOption &LHS,
const WarningOption &RHS) {
return strcmp(LHS.Name, RHS.Name) < 0;
}
bool clang::ProcessWarningOptions(Diagnostic &Diags) {
Diags.setSuppressSystemWarnings(true); // Default to -Wno-system-headers
Diags.setIgnoreAllWarnings(OptNoWarnings);
// FIXME: -fdiagnostics-show-option
// FIXME: -Wfatal-errors / -Wfatal-errors=foo
/// ControlledDiags - Keep track of the options that the user explicitly
/// poked with -Wfoo, -Wno-foo, or -Werror=foo.
llvm::SmallVector<unsigned short, 256> ControlledDiags;
for (unsigned i = 0, e = OptWarnings.size(); i != e; ++i) {
const std::string &Opt = OptWarnings[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.
if (OptEnd-OptStart >= 5 && memcmp(OptStart, "error", 5) == 0) {
const char *Specifier = 0;
if (OptEnd-OptStart != 5) { // Specifier must be present.
if (OptStart[5] != '=' || OptEnd-OptStart == 6) {
fprintf(stderr, "warning: unknown -Werror warning specifier: -W%s\n",
Opt.c_str());
continue;
}
Specifier = OptStart+6;
}
if (Specifier == 0) {
Diags.setWarningsAsErrors(true);
continue;
}
// -Werror=foo maps foo to Error, -Wno-error=foo maps it to Warning.
Mapping = isPositive ? diag::MAP_ERROR : diag::MAP_WARNING;
OptStart = Specifier;
}
WarningOption Key = { OptStart, 0 };
const WarningOption *Found =
std::lower_bound(OptionTable, OptionTable + OptionTableSize, Key,
WarningOptionCompare);
if (Found == OptionTable + OptionTableSize ||
strcmp(Found->Name, OptStart) != 0) {
fprintf(stderr, "warning: unknown warning option: -W%s\n", Opt.c_str());
continue;
}
// Option exists, poke all the members of its diagnostic set.
for (const short *Member = Found->Members; *Member != -1; ++Member) {
Diags.setDiagnosticMapping(*Member, Mapping);
ControlledDiags.push_back(*Member);
}
}
// 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 (OptPedantic || OptPedanticErrors) {
// Sort the array of options that has been poked at directly so we can do
// efficient queries.
std::sort(ControlledDiags.begin(), ControlledDiags.end());
// Don't worry about iteration off the end down below.
ControlledDiags.push_back(diag::DIAG_UPPER_LIMIT);
diag::Mapping Mapping =
OptPedanticErrors ? diag::MAP_ERROR : diag::MAP_WARNING;
// Loop over all of the extension diagnostics. Unless they were explicitly
// controlled, reset their mapping to Mapping. We walk through the
// ControlledDiags in parallel with this walk, which is faster than
// repeatedly binary searching it.
//
llvm::SmallVectorImpl<unsigned short>::iterator ControlledDiagsIt =
ControlledDiags.begin();
// TODO: if it matters, we could make tblgen produce a list of just the
// extension diags to avoid skipping ones that don't matter.
for (unsigned short i = 0; i != diag::DIAG_UPPER_LIMIT; ++i) {
// If this diagnostic was controlled, ignore it.
if (i == *ControlledDiagsIt) {
++ControlledDiagsIt;
while (i == *ControlledDiagsIt) // ControlledDiags can have dupes.
++ControlledDiagsIt;
// Do not map this diagnostic ID#.
continue;
}
// Okay, the user didn't control this ID. If it is an example, map it.
if (Diagnostic::isBuiltinExtensionDiag(i))
Diags.setDiagnosticMapping(i, Mapping);
}
}
return false;
}
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