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llvm-project/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp

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//=- ClangDiagnosticsEmitter.cpp - Generate Clang diagnostics tables -*- C++ -*-
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// These tablegen backends emit Clang diagnostics tables.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/PointerUnion.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/Twine.h"
#include "llvm/TableGen/Error.h"
#include "llvm/TableGen/Record.h"
#include "llvm/TableGen/StringToOffsetTable.h"
#include "llvm/TableGen/TableGenBackend.h"
#include <algorithm>
#include <cctype>
#include <functional>
#include <map>
#include <set>
using namespace llvm;
//===----------------------------------------------------------------------===//
// Diagnostic category computation code.
//===----------------------------------------------------------------------===//
namespace {
class DiagGroupParentMap {
RecordKeeper &Records;
std::map<const Record*, std::vector<Record*> > Mapping;
public:
DiagGroupParentMap(RecordKeeper &records) : Records(records) {
std::vector<Record*> DiagGroups
= Records.getAllDerivedDefinitions("DiagGroup");
for (unsigned i = 0, e = DiagGroups.size(); i != e; ++i) {
std::vector<Record*> SubGroups =
DiagGroups[i]->getValueAsListOfDefs("SubGroups");
for (unsigned j = 0, e = SubGroups.size(); j != e; ++j)
Mapping[SubGroups[j]].push_back(DiagGroups[i]);
}
}
const std::vector<Record*> &getParents(const Record *Group) {
return Mapping[Group];
}
};
} // end anonymous namespace.
static std::string
getCategoryFromDiagGroup(const Record *Group,
DiagGroupParentMap &DiagGroupParents) {
// If the DiagGroup has a category, return it.
std::string CatName = Group->getValueAsString("CategoryName");
if (!CatName.empty()) return CatName;
// The diag group may the subgroup of one or more other diagnostic groups,
// check these for a category as well.
const std::vector<Record*> &Parents = DiagGroupParents.getParents(Group);
for (unsigned i = 0, e = Parents.size(); i != e; ++i) {
CatName = getCategoryFromDiagGroup(Parents[i], DiagGroupParents);
if (!CatName.empty()) return CatName;
}
return "";
}
/// getDiagnosticCategory - Return the category that the specified diagnostic
/// lives in.
static std::string getDiagnosticCategory(const Record *R,
DiagGroupParentMap &DiagGroupParents) {
// If the diagnostic is in a group, and that group has a category, use it.
if (DefInit *Group = dyn_cast<DefInit>(R->getValueInit("Group"))) {
// Check the diagnostic's diag group for a category.
std::string CatName = getCategoryFromDiagGroup(Group->getDef(),
DiagGroupParents);
if (!CatName.empty()) return CatName;
}
// If the diagnostic itself has a category, get it.
return R->getValueAsString("CategoryName");
}
namespace {
class DiagCategoryIDMap {
RecordKeeper &Records;
StringMap<unsigned> CategoryIDs;
std::vector<std::string> CategoryStrings;
public:
DiagCategoryIDMap(RecordKeeper &records) : Records(records) {
DiagGroupParentMap ParentInfo(Records);
// The zero'th category is "".
CategoryStrings.push_back("");
CategoryIDs[""] = 0;
std::vector<Record*> Diags =
Records.getAllDerivedDefinitions("Diagnostic");
for (unsigned i = 0, e = Diags.size(); i != e; ++i) {
std::string Category = getDiagnosticCategory(Diags[i], ParentInfo);
if (Category.empty()) continue; // Skip diags with no category.
unsigned &ID = CategoryIDs[Category];
if (ID != 0) continue; // Already seen.
ID = CategoryStrings.size();
CategoryStrings.push_back(Category);
}
}
unsigned getID(StringRef CategoryString) {
return CategoryIDs[CategoryString];
}
typedef std::vector<std::string>::const_iterator const_iterator;
const_iterator begin() const { return CategoryStrings.begin(); }
const_iterator end() const { return CategoryStrings.end(); }
};
struct GroupInfo {
std::vector<const Record*> DiagsInGroup;
std::vector<std::string> SubGroups;
unsigned IDNo;
const Record *ExplicitDef;
GroupInfo() : ExplicitDef(nullptr) {}
};
} // end anonymous namespace.
static bool beforeThanCompare(const Record *LHS, const Record *RHS) {
assert(!LHS->getLoc().empty() && !RHS->getLoc().empty());
return
LHS->getLoc().front().getPointer() < RHS->getLoc().front().getPointer();
}
static bool diagGroupBeforeByName(const Record *LHS, const Record *RHS) {
return LHS->getValueAsString("GroupName") <
RHS->getValueAsString("GroupName");
}
static bool beforeThanCompareGroups(const GroupInfo *LHS, const GroupInfo *RHS){
assert(!LHS->DiagsInGroup.empty() && !RHS->DiagsInGroup.empty());
return beforeThanCompare(LHS->DiagsInGroup.front(),
RHS->DiagsInGroup.front());
}
static SMRange findSuperClassRange(const Record *R, StringRef SuperName) {
ArrayRef<std::pair<Record *, SMRange>> Supers = R->getSuperClasses();
auto I = std::find_if(Supers.begin(), Supers.end(),
[&](const std::pair<Record *, SMRange> &SuperPair) {
return SuperPair.first->getName() == SuperName;
});
return (I != Supers.end()) ? I->second : SMRange();
}
/// \brief Invert the 1-[0/1] mapping of diags to group into a one to many
/// mapping of groups to diags in the group.
static void groupDiagnostics(const std::vector<Record*> &Diags,
const std::vector<Record*> &DiagGroups,
std::map<std::string, GroupInfo> &DiagsInGroup) {
for (unsigned i = 0, e = Diags.size(); i != e; ++i) {
const Record *R = Diags[i];
DefInit *DI = dyn_cast<DefInit>(R->getValueInit("Group"));
if (!DI)
continue;
assert(R->getValueAsDef("Class")->getName() != "CLASS_NOTE" &&
"Note can't be in a DiagGroup");
std::string GroupName = DI->getDef()->getValueAsString("GroupName");
DiagsInGroup[GroupName].DiagsInGroup.push_back(R);
}
typedef SmallPtrSet<GroupInfo *, 16> GroupSetTy;
GroupSetTy ImplicitGroups;
// Add all DiagGroup's to the DiagsInGroup list to make sure we pick up empty
// groups (these are warnings that GCC supports that clang never produces).
for (unsigned i = 0, e = DiagGroups.size(); i != e; ++i) {
Record *Group = DiagGroups[i];
GroupInfo &GI = DiagsInGroup[Group->getValueAsString("GroupName")];
if (Group->isAnonymous()) {
if (GI.DiagsInGroup.size() > 1)
ImplicitGroups.insert(&GI);
} else {
if (GI.ExplicitDef)
assert(GI.ExplicitDef == Group);
else
GI.ExplicitDef = Group;
}
std::vector<Record*> SubGroups = Group->getValueAsListOfDefs("SubGroups");
for (unsigned j = 0, e = SubGroups.size(); j != e; ++j)
GI.SubGroups.push_back(SubGroups[j]->getValueAsString("GroupName"));
}
// Assign unique ID numbers to the groups.
unsigned IDNo = 0;
for (std::map<std::string, GroupInfo>::iterator
I = DiagsInGroup.begin(), E = DiagsInGroup.end(); I != E; ++I, ++IDNo)
I->second.IDNo = IDNo;
// Sort the implicit groups, so we can warn about them deterministically.
SmallVector<GroupInfo *, 16> SortedGroups(ImplicitGroups.begin(),
ImplicitGroups.end());
for (SmallVectorImpl<GroupInfo *>::iterator I = SortedGroups.begin(),
E = SortedGroups.end();
I != E; ++I) {
MutableArrayRef<const Record *> GroupDiags = (*I)->DiagsInGroup;
std::sort(GroupDiags.begin(), GroupDiags.end(), beforeThanCompare);
}
std::sort(SortedGroups.begin(), SortedGroups.end(), beforeThanCompareGroups);
// Warn about the same group being used anonymously in multiple places.
for (SmallVectorImpl<GroupInfo *>::const_iterator I = SortedGroups.begin(),
E = SortedGroups.end();
I != E; ++I) {
ArrayRef<const Record *> GroupDiags = (*I)->DiagsInGroup;
if ((*I)->ExplicitDef) {
std::string Name = (*I)->ExplicitDef->getValueAsString("GroupName");
for (ArrayRef<const Record *>::const_iterator DI = GroupDiags.begin(),
DE = GroupDiags.end();
DI != DE; ++DI) {
const DefInit *GroupInit = cast<DefInit>((*DI)->getValueInit("Group"));
const Record *NextDiagGroup = GroupInit->getDef();
if (NextDiagGroup == (*I)->ExplicitDef)
continue;
SMRange InGroupRange = findSuperClassRange(*DI, "InGroup");
SmallString<64> Replacement;
if (InGroupRange.isValid()) {
Replacement += "InGroup<";
Replacement += (*I)->ExplicitDef->getName();
Replacement += ">";
}
SMFixIt FixIt(InGroupRange, Replacement);
SrcMgr.PrintMessage(NextDiagGroup->getLoc().front(),
SourceMgr::DK_Error,
Twine("group '") + Name +
"' is referred to anonymously",
None,
InGroupRange.isValid() ? FixIt
: ArrayRef<SMFixIt>());
SrcMgr.PrintMessage((*I)->ExplicitDef->getLoc().front(),
SourceMgr::DK_Note, "group defined here");
}
} else {
// If there's no existing named group, we should just warn once and use
// notes to list all the other cases.
ArrayRef<const Record *>::const_iterator DI = GroupDiags.begin(),
DE = GroupDiags.end();
assert(DI != DE && "We only care about groups with multiple uses!");
const DefInit *GroupInit = cast<DefInit>((*DI)->getValueInit("Group"));
const Record *NextDiagGroup = GroupInit->getDef();
std::string Name = NextDiagGroup->getValueAsString("GroupName");
SMRange InGroupRange = findSuperClassRange(*DI, "InGroup");
SrcMgr.PrintMessage(NextDiagGroup->getLoc().front(),
SourceMgr::DK_Error,
Twine("group '") + Name +
"' is referred to anonymously",
InGroupRange);
for (++DI; DI != DE; ++DI) {
GroupInit = cast<DefInit>((*DI)->getValueInit("Group"));
InGroupRange = findSuperClassRange(*DI, "InGroup");
SrcMgr.PrintMessage(GroupInit->getDef()->getLoc().front(),
SourceMgr::DK_Note, "also referenced here",
InGroupRange);
}
}
}
}
//===----------------------------------------------------------------------===//
// Infer members of -Wpedantic.
//===----------------------------------------------------------------------===//
typedef std::vector<const Record *> RecordVec;
typedef llvm::DenseSet<const Record *> RecordSet;
typedef llvm::PointerUnion<RecordVec*, RecordSet*> VecOrSet;
namespace {
class InferPedantic {
typedef llvm::DenseMap<const Record*,
std::pair<unsigned, Optional<unsigned> > > GMap;
DiagGroupParentMap &DiagGroupParents;
const std::vector<Record*> &Diags;
const std::vector<Record*> DiagGroups;
std::map<std::string, GroupInfo> &DiagsInGroup;
llvm::DenseSet<const Record*> DiagsSet;
GMap GroupCount;
public:
InferPedantic(DiagGroupParentMap &DiagGroupParents,
const std::vector<Record*> &Diags,
const std::vector<Record*> &DiagGroups,
std::map<std::string, GroupInfo> &DiagsInGroup)
: DiagGroupParents(DiagGroupParents),
Diags(Diags),
DiagGroups(DiagGroups),
DiagsInGroup(DiagsInGroup) {}
/// Compute the set of diagnostics and groups that are immediately
/// in -Wpedantic.
void compute(VecOrSet DiagsInPedantic,
VecOrSet GroupsInPedantic);
private:
/// Determine whether a group is a subgroup of another group.
bool isSubGroupOfGroup(const Record *Group,
llvm::StringRef RootGroupName);
/// Determine if the diagnostic is an extension.
bool isExtension(const Record *Diag);
/// Determine if the diagnostic is off by default.
bool isOffByDefault(const Record *Diag);
/// Increment the count for a group, and transitively marked
/// parent groups when appropriate.
void markGroup(const Record *Group);
/// Return true if the diagnostic is in a pedantic group.
bool groupInPedantic(const Record *Group, bool increment = false);
};
} // end anonymous namespace
bool InferPedantic::isSubGroupOfGroup(const Record *Group,
llvm::StringRef GName) {
const std::string &GroupName = Group->getValueAsString("GroupName");
if (GName == GroupName)
return true;
const std::vector<Record*> &Parents = DiagGroupParents.getParents(Group);
for (unsigned i = 0, e = Parents.size(); i != e; ++i)
if (isSubGroupOfGroup(Parents[i], GName))
return true;
return false;
}
/// Determine if the diagnostic is an extension.
bool InferPedantic::isExtension(const Record *Diag) {
const std::string &ClsName = Diag->getValueAsDef("Class")->getName();
return ClsName == "CLASS_EXTENSION";
}
bool InferPedantic::isOffByDefault(const Record *Diag) {
const std::string &DefSeverity =
Diag->getValueAsDef("DefaultSeverity")->getValueAsString("Name");
return DefSeverity == "Ignored";
}
bool InferPedantic::groupInPedantic(const Record *Group, bool increment) {
GMap::mapped_type &V = GroupCount[Group];
// Lazily compute the threshold value for the group count.
if (!V.second.hasValue()) {
const GroupInfo &GI = DiagsInGroup[Group->getValueAsString("GroupName")];
V.second = GI.SubGroups.size() + GI.DiagsInGroup.size();
}
if (increment)
++V.first;
// Consider a group in -Wpendatic IFF if has at least one diagnostic
// or subgroup AND all of those diagnostics and subgroups are covered
// by -Wpedantic via our computation.
return V.first != 0 && V.first == V.second.getValue();
}
void InferPedantic::markGroup(const Record *Group) {
// If all the diagnostics and subgroups have been marked as being
// covered by -Wpedantic, increment the count of parent groups. Once the
// group's count is equal to the number of subgroups and diagnostics in
// that group, we can safely add this group to -Wpedantic.
if (groupInPedantic(Group, /* increment */ true)) {
const std::vector<Record*> &Parents = DiagGroupParents.getParents(Group);
for (unsigned i = 0, e = Parents.size(); i != e; ++i)
markGroup(Parents[i]);
}
}
void InferPedantic::compute(VecOrSet DiagsInPedantic,
VecOrSet GroupsInPedantic) {
// All extensions that are not on by default are implicitly in the
// "pedantic" group. For those that aren't explicitly included in -Wpedantic,
// mark them for consideration to be included in -Wpedantic directly.
for (unsigned i = 0, e = Diags.size(); i != e; ++i) {
Record *R = Diags[i];
if (isExtension(R) && isOffByDefault(R)) {
DiagsSet.insert(R);
if (DefInit *Group = dyn_cast<DefInit>(R->getValueInit("Group"))) {
const Record *GroupRec = Group->getDef();
if (!isSubGroupOfGroup(GroupRec, "pedantic")) {
markGroup(GroupRec);
}
}
}
}
// Compute the set of diagnostics that are directly in -Wpedantic. We
// march through Diags a second time to ensure the results are emitted
// in deterministic order.
for (unsigned i = 0, e = Diags.size(); i != e; ++i) {
Record *R = Diags[i];
if (!DiagsSet.count(R))
continue;
// Check if the group is implicitly in -Wpedantic. If so,
// the diagnostic should not be directly included in the -Wpedantic
// diagnostic group.
if (DefInit *Group = dyn_cast<DefInit>(R->getValueInit("Group")))
if (groupInPedantic(Group->getDef()))
continue;
// The diagnostic is not included in a group that is (transitively) in
// -Wpedantic. Include it in -Wpedantic directly.
if (RecordVec *V = DiagsInPedantic.dyn_cast<RecordVec*>())
V->push_back(R);
else {
DiagsInPedantic.get<RecordSet*>()->insert(R);
}
}
if (!GroupsInPedantic)
return;
// Compute the set of groups that are directly in -Wpedantic. We
// march through the groups to ensure the results are emitted
/// in a deterministc order.
for (unsigned i = 0, ei = DiagGroups.size(); i != ei; ++i) {
Record *Group = DiagGroups[i];
if (!groupInPedantic(Group))
continue;
unsigned ParentsInPedantic = 0;
const std::vector<Record*> &Parents = DiagGroupParents.getParents(Group);
for (unsigned j = 0, ej = Parents.size(); j != ej; ++j) {
if (groupInPedantic(Parents[j]))
++ParentsInPedantic;
}
// If all the parents are in -Wpedantic, this means that this diagnostic
// group will be indirectly included by -Wpedantic already. In that
// case, do not add it directly to -Wpedantic. If the group has no
// parents, obviously it should go into -Wpedantic.
if (Parents.size() > 0 && ParentsInPedantic == Parents.size())
continue;
if (RecordVec *V = GroupsInPedantic.dyn_cast<RecordVec*>())
V->push_back(Group);
else {
GroupsInPedantic.get<RecordSet*>()->insert(Group);
}
}
}
//===----------------------------------------------------------------------===//
// Warning Tables (.inc file) generation.
//===----------------------------------------------------------------------===//
static bool isError(const Record &Diag) {
const std::string &ClsName = Diag.getValueAsDef("Class")->getName();
return ClsName == "CLASS_ERROR";
}
static bool isRemark(const Record &Diag) {
const std::string &ClsName = Diag.getValueAsDef("Class")->getName();
return ClsName == "CLASS_REMARK";
}
/// ClangDiagsDefsEmitter - The top-level class emits .def files containing
/// declarations of Clang diagnostics.
namespace clang {
void EmitClangDiagsDefs(RecordKeeper &Records, raw_ostream &OS,
const std::string &Component) {
// Write the #if guard
if (!Component.empty()) {
std::string ComponentName = StringRef(Component).upper();
OS << "#ifdef " << ComponentName << "START\n";
OS << "__" << ComponentName << "START = DIAG_START_" << ComponentName
<< ",\n";
OS << "#undef " << ComponentName << "START\n";
OS << "#endif\n\n";
}
const std::vector<Record*> &Diags =
Records.getAllDerivedDefinitions("Diagnostic");
std::vector<Record*> DiagGroups
= Records.getAllDerivedDefinitions("DiagGroup");
std::map<std::string, GroupInfo> DiagsInGroup;
groupDiagnostics(Diags, DiagGroups, DiagsInGroup);
DiagCategoryIDMap CategoryIDs(Records);
DiagGroupParentMap DGParentMap(Records);
// Compute the set of diagnostics that are in -Wpedantic.
RecordSet DiagsInPedantic;
InferPedantic inferPedantic(DGParentMap, Diags, DiagGroups, DiagsInGroup);
inferPedantic.compute(&DiagsInPedantic, (RecordVec*)nullptr);
for (unsigned i = 0, e = Diags.size(); i != e; ++i) {
const Record &R = *Diags[i];
// Check if this is an error that is accidentally in a warning
// group.
if (isError(R)) {
if (DefInit *Group = dyn_cast<DefInit>(R.getValueInit("Group"))) {
const Record *GroupRec = Group->getDef();
const std::string &GroupName = GroupRec->getValueAsString("GroupName");
PrintFatalError(R.getLoc(), "Error " + R.getName() +
" cannot be in a warning group [" + GroupName + "]");
}
}
// Check that all remarks have an associated diagnostic group.
if (isRemark(R)) {
if (!isa<DefInit>(R.getValueInit("Group"))) {
PrintFatalError(R.getLoc(), "Error " + R.getName() +
" not in any diagnostic group");
}
}
// Filter by component.
if (!Component.empty() && Component != R.getValueAsString("Component"))
continue;
OS << "DIAG(" << R.getName() << ", ";
OS << R.getValueAsDef("Class")->getName();
OS << ", (unsigned)diag::Severity::"
<< R.getValueAsDef("DefaultSeverity")->getValueAsString("Name");
// Description string.
OS << ", \"";
OS.write_escaped(R.getValueAsString("Text")) << '"';
// Warning associated with the diagnostic. This is stored as an index into
// the alphabetically sorted warning table.
if (DefInit *DI = dyn_cast<DefInit>(R.getValueInit("Group"))) {
std::map<std::string, GroupInfo>::iterator I =
DiagsInGroup.find(DI->getDef()->getValueAsString("GroupName"));
assert(I != DiagsInGroup.end());
OS << ", " << I->second.IDNo;
} else if (DiagsInPedantic.count(&R)) {
std::map<std::string, GroupInfo>::iterator I =
DiagsInGroup.find("pedantic");
assert(I != DiagsInGroup.end() && "pedantic group not defined");
OS << ", " << I->second.IDNo;
} else {
OS << ", 0";
}
// SFINAE response.
OS << ", " << R.getValueAsDef("SFINAE")->getName();
// Default warning has no Werror bit.
if (R.getValueAsBit("WarningNoWerror"))
OS << ", true";
else
OS << ", false";
if (R.getValueAsBit("ShowInSystemHeader"))
OS << ", true";
else
OS << ", false";
// Category number.
OS << ", " << CategoryIDs.getID(getDiagnosticCategory(&R, DGParentMap));
OS << ")\n";
}
}
} // end namespace clang
//===----------------------------------------------------------------------===//
// Warning Group Tables generation
//===----------------------------------------------------------------------===//
static std::string getDiagCategoryEnum(llvm::StringRef name) {
if (name.empty())
return "DiagCat_None";
SmallString<256> enumName = llvm::StringRef("DiagCat_");
for (llvm::StringRef::iterator I = name.begin(), E = name.end(); I != E; ++I)
enumName += isalnum(*I) ? *I : '_';
return enumName.str();
}
/// \brief Emit the array of diagnostic subgroups.
///
/// The array of diagnostic subgroups contains for each group a list of its
/// subgroups. The individual lists are separated by '-1'. Groups with no
/// subgroups are skipped.
///
/// \code
/// static const int16_t DiagSubGroups[] = {
/// /* Empty */ -1,
/// /* DiagSubGroup0 */ 142, -1,
/// /* DiagSubGroup13 */ 265, 322, 399, -1
/// }
/// \endcode
///
static void emitDiagSubGroups(std::map<std::string, GroupInfo> &DiagsInGroup,
RecordVec &GroupsInPedantic, raw_ostream &OS) {
OS << "static const int16_t DiagSubGroups[] = {\n"
<< " /* Empty */ -1,\n";
for (auto const &I : DiagsInGroup) {
const bool IsPedantic = I.first == "pedantic";
const std::vector<std::string> &SubGroups = I.second.SubGroups;
if (!SubGroups.empty() || (IsPedantic && !GroupsInPedantic.empty())) {
OS << " /* DiagSubGroup" << I.second.IDNo << " */ ";
for (auto const &SubGroup : SubGroups) {
std::map<std::string, GroupInfo>::const_iterator RI =
DiagsInGroup.find(SubGroup);
assert(RI != DiagsInGroup.end() && "Referenced without existing?");
OS << RI->second.IDNo << ", ";
}
// Emit the groups implicitly in "pedantic".
if (IsPedantic) {
for (auto const &Group : GroupsInPedantic) {
const std::string &GroupName = Group->getValueAsString("GroupName");
std::map<std::string, GroupInfo>::const_iterator RI =
DiagsInGroup.find(GroupName);
assert(RI != DiagsInGroup.end() && "Referenced without existing?");
OS << RI->second.IDNo << ", ";
}
}
OS << "-1,\n";
}
}
OS << "};\n\n";
}
/// \brief Emit the list of diagnostic arrays.
///
/// This data structure is a large array that contains itself arrays of varying
/// size. Each array represents a list of diagnostics. The different arrays are
/// separated by the value '-1'.
///
/// \code
/// static const int16_t DiagArrays[] = {
/// /* Empty */ -1,
/// /* DiagArray1 */ diag::warn_pragma_message,
/// -1,
/// /* DiagArray2 */ diag::warn_abs_too_small,
/// diag::warn_unsigned_abs,
/// diag::warn_wrong_absolute_value_type,
/// -1
/// };
/// \endcode
///
static void emitDiagArrays(std::map<std::string, GroupInfo> &DiagsInGroup,
RecordVec &DiagsInPedantic, raw_ostream &OS) {
OS << "static const int16_t DiagArrays[] = {\n"
<< " /* Empty */ -1,\n";
for (auto const &I : DiagsInGroup) {
const bool IsPedantic = I.first == "pedantic";
const std::vector<const Record *> &V = I.second.DiagsInGroup;
if (!V.empty() || (IsPedantic && !DiagsInPedantic.empty())) {
OS << " /* DiagArray" << I.second.IDNo << " */ ";
for (auto *Record : V)
OS << "diag::" << Record->getName() << ", ";
// Emit the diagnostics implicitly in "pedantic".
if (IsPedantic) {
for (auto const &Diag : DiagsInPedantic)
OS << "diag::" << Diag->getName() << ", ";
}
OS << "-1,\n";
}
}
OS << "};\n\n";
}
/// \brief Emit a list of group names.
///
/// This creates a long string which by itself contains a list of pascal style
/// strings, which consist of a length byte directly followed by the string.
///
/// \code
/// static const char DiagGroupNames[] = {
/// \000\020#pragma-messages\t#warnings\020CFString-literal"
/// };
/// \endcode
static void emitDiagGroupNames(StringToOffsetTable &GroupNames,
raw_ostream &OS) {
OS << "static const char DiagGroupNames[] = {\n";
GroupNames.EmitString(OS);
OS << "};\n\n";
}
/// \brief Emit diagnostic arrays and related data structures.
///
/// This creates the actual diagnostic array, an array of diagnostic subgroups
/// and an array of subgroup names.
///
/// \code
/// #ifdef GET_DIAG_ARRAYS
/// static const int16_t DiagArrays[];
/// static const int16_t DiagSubGroups[];
/// static const char DiagGroupNames[];
/// #endif
/// \endcode
static void emitAllDiagArrays(std::map<std::string, GroupInfo> &DiagsInGroup,
RecordVec &DiagsInPedantic,
RecordVec &GroupsInPedantic,
StringToOffsetTable &GroupNames,
raw_ostream &OS) {
OS << "\n#ifdef GET_DIAG_ARRAYS\n";
emitDiagArrays(DiagsInGroup, DiagsInPedantic, OS);
emitDiagSubGroups(DiagsInGroup, GroupsInPedantic, OS);
emitDiagGroupNames(GroupNames, OS);
OS << "#endif // GET_DIAG_ARRAYS\n\n";
}
/// \brief Emit diagnostic table.
///
/// The table is sorted by the name of the diagnostic group. Each element
/// consists of the name of the diagnostic group (given as offset in the
/// group name table), a reference to a list of diagnostics (optional) and a
/// reference to a set of subgroups (optional).
///
/// \code
/// #ifdef GET_DIAG_TABLE
/// {/* abi */ 159, /* DiagArray11 */ 19, /* Empty */ 0},
/// {/* aggregate-return */ 180, /* Empty */ 0, /* Empty */ 0},
/// {/* all */ 197, /* Empty */ 0, /* DiagSubGroup13 */ 3},
/// {/* deprecated */ 1981,/* DiagArray1 */ 348, /* DiagSubGroup3 */ 9},
/// #endif
/// \endcode
static void emitDiagTable(std::map<std::string, GroupInfo> &DiagsInGroup,
RecordVec &DiagsInPedantic,
RecordVec &GroupsInPedantic,
StringToOffsetTable &GroupNames, raw_ostream &OS) {
unsigned MaxLen = 0;
for (auto const &I: DiagsInGroup)
MaxLen = std::max(MaxLen, (unsigned)I.first.size());
OS << "\n#ifdef GET_DIAG_TABLE\n";
unsigned SubGroupIndex = 1, DiagArrayIndex = 1;
for (auto const &I: DiagsInGroup) {
// Group option string.
OS << " { /* ";
if (I.first.find_first_not_of("abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"0123456789!@#$%^*-+=:?") !=
std::string::npos)
PrintFatalError("Invalid character in diagnostic group '" + I.first +
"'");
OS << I.first << " */ " << std::string(MaxLen - I.first.size(), ' ');
// Store a pascal-style length byte at the beginning of the string.
std::string Name = char(I.first.size()) + I.first;
OS << GroupNames.GetOrAddStringOffset(Name, false) << ", ";
// Special handling for 'pedantic'.
const bool IsPedantic = I.first == "pedantic";
// Diagnostics in the group.
const std::vector<const Record *> &V = I.second.DiagsInGroup;
const bool hasDiags =
!V.empty() || (IsPedantic && !DiagsInPedantic.empty());
if (hasDiags) {
OS << "/* DiagArray" << I.second.IDNo << " */ " << DiagArrayIndex
<< ", ";
if (IsPedantic)
DiagArrayIndex += DiagsInPedantic.size();
DiagArrayIndex += V.size() + 1;
} else {
OS << "/* Empty */ 0, ";
}
// Subgroups.
const std::vector<std::string> &SubGroups = I.second.SubGroups;
const bool hasSubGroups =
!SubGroups.empty() || (IsPedantic && !GroupsInPedantic.empty());
if (hasSubGroups) {
OS << "/* DiagSubGroup" << I.second.IDNo << " */ " << SubGroupIndex;
if (IsPedantic)
SubGroupIndex += GroupsInPedantic.size();
SubGroupIndex += SubGroups.size() + 1;
} else {
OS << "/* Empty */ 0";
}
OS << " },\n";
}
OS << "#endif // GET_DIAG_TABLE\n\n";
}
/// \brief Emit the table of diagnostic categories.
///
/// The table has the form of macro calls that have two parameters. The
/// category's name as well as an enum that represents the category. The
/// table can be used by defining the macro 'CATEGORY' and including this
/// table right after.
///
/// \code
/// #ifdef GET_CATEGORY_TABLE
/// CATEGORY("Semantic Issue", DiagCat_Semantic_Issue)
/// CATEGORY("Lambda Issue", DiagCat_Lambda_Issue)
/// #endif
/// \endcode
static void emitCategoryTable(RecordKeeper &Records, raw_ostream &OS) {
DiagCategoryIDMap CategoriesByID(Records);
OS << "\n#ifdef GET_CATEGORY_TABLE\n";
for (auto const &C : CategoriesByID)
OS << "CATEGORY(\"" << C << "\", " << getDiagCategoryEnum(C) << ")\n";
OS << "#endif // GET_CATEGORY_TABLE\n\n";
}
namespace clang {
void EmitClangDiagGroups(RecordKeeper &Records, raw_ostream &OS) {
// Compute a mapping from a DiagGroup to all of its parents.
DiagGroupParentMap DGParentMap(Records);
std::vector<Record *> Diags = Records.getAllDerivedDefinitions("Diagnostic");
std::vector<Record *> DiagGroups =
Records.getAllDerivedDefinitions("DiagGroup");
std::map<std::string, GroupInfo> DiagsInGroup;
groupDiagnostics(Diags, DiagGroups, DiagsInGroup);
// All extensions are implicitly in the "pedantic" group. Record the
// implicit set of groups in the "pedantic" group, and use this information
// later when emitting the group information for Pedantic.
RecordVec DiagsInPedantic;
RecordVec GroupsInPedantic;
InferPedantic inferPedantic(DGParentMap, Diags, DiagGroups, DiagsInGroup);
inferPedantic.compute(&DiagsInPedantic, &GroupsInPedantic);
StringToOffsetTable GroupNames;
for (std::map<std::string, GroupInfo>::const_iterator
I = DiagsInGroup.begin(),
E = DiagsInGroup.end();
I != E; ++I) {
// Store a pascal-style length byte at the beginning of the string.
std::string Name = char(I->first.size()) + I->first;
GroupNames.GetOrAddStringOffset(Name, false);
}
emitAllDiagArrays(DiagsInGroup, DiagsInPedantic, GroupsInPedantic, GroupNames,
OS);
emitDiagTable(DiagsInGroup, DiagsInPedantic, GroupsInPedantic, GroupNames,
OS);
emitCategoryTable(Records, OS);
}
} // end namespace clang
//===----------------------------------------------------------------------===//
// Diagnostic name index generation
//===----------------------------------------------------------------------===//
namespace {
struct RecordIndexElement
{
RecordIndexElement() {}
explicit RecordIndexElement(Record const &R):
Name(R.getName()) {}
std::string Name;
};
} // end anonymous namespace.
namespace clang {
void EmitClangDiagsIndexName(RecordKeeper &Records, raw_ostream &OS) {
const std::vector<Record*> &Diags =
Records.getAllDerivedDefinitions("Diagnostic");
std::vector<RecordIndexElement> Index;
Index.reserve(Diags.size());
for (unsigned i = 0, e = Diags.size(); i != e; ++i) {
const Record &R = *(Diags[i]);
Index.push_back(RecordIndexElement(R));
}
std::sort(Index.begin(), Index.end(),
[](const RecordIndexElement &Lhs,
const RecordIndexElement &Rhs) { return Lhs.Name < Rhs.Name; });
for (unsigned i = 0, e = Index.size(); i != e; ++i) {
const RecordIndexElement &R = Index[i];
OS << "DIAG_NAME_INDEX(" << R.Name << ")\n";
}
}
//===----------------------------------------------------------------------===//
// Diagnostic documentation generation
//===----------------------------------------------------------------------===//
namespace docs {
namespace {
/// Diagnostic text, parsed into pieces.
struct DiagText {
struct Piece {
// This type and its derived classes are move-only.
Piece() {}
Piece(Piece &&O) {}
Piece &operator=(Piece &&O) { return *this; }
virtual void print(std::vector<std::string> &RST) = 0;
virtual ~Piece() {}
};
struct TextPiece : Piece {
StringRef Role;
std::string Text;
void print(std::vector<std::string> &RST) override;
};
struct PlaceholderPiece : Piece {
int Index;
void print(std::vector<std::string> &RST) override;
};
struct SelectPiece : Piece {
SelectPiece() {}
SelectPiece(SelectPiece &&O) noexcept : Options(std::move(O.Options)) {}
std::vector<DiagText> Options;
void print(std::vector<std::string> &RST) override;
};
std::vector<std::unique_ptr<Piece>> Pieces;
DiagText();
DiagText(DiagText &&O) noexcept : Pieces(std::move(O.Pieces)) {}
DiagText(StringRef Text);
DiagText(StringRef Kind, StringRef Text);
template<typename P> void add(P Piece) {
Pieces.push_back(llvm::make_unique<P>(std::move(Piece)));
}
void print(std::vector<std::string> &RST);
};
DiagText parseDiagText(StringRef &Text, bool Nested = false) {
DiagText Parsed;
while (!Text.empty()) {
size_t End = (size_t)-2;
do
End = Nested ? Text.find_first_of("%|}", End + 2)
: Text.find_first_of('%', End + 2);
while (End < Text.size() - 1 && Text[End] == '%' && Text[End + 1] == '%');
if (End) {
DiagText::TextPiece Piece;
Piece.Role = "diagtext";
Piece.Text = Text.slice(0, End);
Parsed.add(std::move(Piece));
Text = Text.slice(End, StringRef::npos);
if (Text.empty()) break;
}
if (Text[0] == '|' || Text[0] == '}')
break;
// Drop the '%'.
Text = Text.drop_front();
// Extract the (optional) modifier.
size_t ModLength = Text.find_first_of("0123456789{");
StringRef Modifier = Text.slice(0, ModLength);
Text = Text.slice(ModLength, StringRef::npos);
// FIXME: Handle %ordinal here.
if (Modifier == "select" || Modifier == "plural") {
DiagText::SelectPiece Select;
do {
Text = Text.drop_front();
if (Modifier == "plural")
while (Text[0] != ':')
Text = Text.drop_front();
Select.Options.push_back(parseDiagText(Text, true));
assert(!Text.empty() && "malformed %select");
} while (Text.front() == '|');
Parsed.add(std::move(Select));
// Drop the trailing '}n'.
Text = Text.drop_front(2);
continue;
}
// For %diff, just take the second alternative (tree diagnostic). It would
// be preferable to take the first one, and replace the $ with the suitable
// placeholders.
if (Modifier == "diff") {
Text = Text.drop_front(); // '{'
parseDiagText(Text, true);
Text = Text.drop_front(); // '|'
DiagText D = parseDiagText(Text, true);
for (auto &P : D.Pieces)
Parsed.Pieces.push_back(std::move(P));
Text = Text.drop_front(4); // '}n,m'
continue;
}
if (Modifier == "s") {
Text = Text.drop_front();
DiagText::SelectPiece Select;
Select.Options.push_back(DiagText(""));
Select.Options.push_back(DiagText("s"));
Parsed.add(std::move(Select));
continue;
}
assert(!Text.empty() && isdigit(Text[0]) && "malformed placeholder");
DiagText::PlaceholderPiece Placeholder;
Placeholder.Index = Text[0] - '0';
Parsed.add(std::move(Placeholder));
Text = Text.drop_front();
continue;
}
return Parsed;
}
DiagText::DiagText() {}
DiagText::DiagText(StringRef Text) : DiagText(parseDiagText(Text, false)) {}
DiagText::DiagText(StringRef Kind, StringRef Text) : DiagText(parseDiagText(Text, false)) {
TextPiece Prefix;
Prefix.Role = Kind;
Prefix.Text = Kind;
Prefix.Text += ": ";
Pieces.insert(Pieces.begin(),
llvm::make_unique<TextPiece>(std::move(Prefix)));
}
void escapeRST(StringRef Str, std::string &Out) {
for (auto K : Str) {
if (StringRef("`*|_[]\\").count(K))
Out.push_back('\\');
Out.push_back(K);
}
}
template<typename It> void padToSameLength(It Begin, It End) {
size_t Width = 0;
for (It I = Begin; I != End; ++I)
Width = std::max(Width, I->size());
for (It I = Begin; I != End; ++I)
(*I) += std::string(Width - I->size(), ' ');
}
template<typename It> void makeTableRows(It Begin, It End) {
if (Begin == End) return;
padToSameLength(Begin, End);
for (It I = Begin; I != End; ++I)
*I = "|" + *I + "|";
}
void makeRowSeparator(std::string &Str) {
for (char &K : Str)
K = (K == '|' ? '+' : '-');
}
void DiagText::print(std::vector<std::string> &RST) {
if (Pieces.empty()) {
RST.push_back("");
return;
}
if (Pieces.size() == 1)
return Pieces[0]->print(RST);
std::string EmptyLinePrefix;
size_t Start = RST.size();
bool HasMultipleLines = true;
for (auto &P : Pieces) {
std::vector<std::string> Lines;
P->print(Lines);
if (Lines.empty())
continue;
// We need a vertical separator if either this or the previous piece is a
// multi-line piece, or this is the last piece.
const char *Separator = (Lines.size() > 1 || HasMultipleLines) ? "|" : "";
HasMultipleLines = Lines.size() > 1;
if (Start + Lines.size() > RST.size())
RST.resize(Start + Lines.size(), EmptyLinePrefix);
padToSameLength(Lines.begin(), Lines.end());
for (size_t I = 0; I != Lines.size(); ++I)
RST[Start + I] += Separator + Lines[I];
std::string Empty(Lines[0].size(), ' ');
for (size_t I = Start + Lines.size(); I != RST.size(); ++I)
RST[I] += Separator + Empty;
EmptyLinePrefix += Separator + Empty;
}
for (size_t I = Start; I != RST.size(); ++I)
RST[I] += "|";
EmptyLinePrefix += "|";
makeRowSeparator(EmptyLinePrefix);
RST.insert(RST.begin() + Start, EmptyLinePrefix);
RST.insert(RST.end(), EmptyLinePrefix);
}
void DiagText::TextPiece::print(std::vector<std::string> &RST) {
RST.push_back("");
auto &S = RST.back();
StringRef T = Text;
while (!T.empty() && T.front() == ' ') {
RST.back() += " |nbsp| ";
T = T.drop_front();
}
std::string Suffix;
while (!T.empty() && T.back() == ' ') {
Suffix += " |nbsp| ";
T = T.drop_back();
}
if (!T.empty()) {
S += ':';
S += Role;
S += ":`";
escapeRST(T, S);
S += '`';
}
S += Suffix;
}
void DiagText::PlaceholderPiece::print(std::vector<std::string> &RST) {
RST.push_back(std::string(":placeholder:`") + char('A' + Index) + "`");
}
void DiagText::SelectPiece::print(std::vector<std::string> &RST) {
std::vector<size_t> SeparatorIndexes;
SeparatorIndexes.push_back(RST.size());
RST.emplace_back();
for (auto &O : Options) {
O.print(RST);
SeparatorIndexes.push_back(RST.size());
RST.emplace_back();
}
makeTableRows(RST.begin() + SeparatorIndexes.front(),
RST.begin() + SeparatorIndexes.back() + 1);
for (size_t I : SeparatorIndexes)
makeRowSeparator(RST[I]);
}
bool isRemarkGroup(const Record *DiagGroup,
const std::map<std::string, GroupInfo> &DiagsInGroup) {
bool AnyRemarks = false, AnyNonRemarks = false;
std::function<void(StringRef)> Visit = [&](StringRef GroupName) {
auto &GroupInfo = DiagsInGroup.find(GroupName)->second;
for (const Record *Diag : GroupInfo.DiagsInGroup)
(isRemark(*Diag) ? AnyRemarks : AnyNonRemarks) = true;
for (const auto &Name : GroupInfo.SubGroups)
Visit(Name);
};
Visit(DiagGroup->getValueAsString("GroupName"));
if (AnyRemarks && AnyNonRemarks)
PrintFatalError(
DiagGroup->getLoc(),
"Diagnostic group contains both remark and non-remark diagnostics");
return AnyRemarks;
}
std::string getDefaultSeverity(const Record *Diag) {
return Diag->getValueAsDef("DefaultSeverity")->getValueAsString("Name");
}
std::set<std::string>
getDefaultSeverities(const Record *DiagGroup,
const std::map<std::string, GroupInfo> &DiagsInGroup) {
std::set<std::string> States;
std::function<void(StringRef)> Visit = [&](StringRef GroupName) {
auto &GroupInfo = DiagsInGroup.find(GroupName)->second;
for (const Record *Diag : GroupInfo.DiagsInGroup)
States.insert(getDefaultSeverity(Diag));
for (const auto &Name : GroupInfo.SubGroups)
Visit(Name);
};
Visit(DiagGroup->getValueAsString("GroupName"));
return States;
}
void writeHeader(StringRef Str, raw_ostream &OS, char Kind = '-') {
OS << Str << "\n" << std::string(Str.size(), Kind) << "\n";
}
void writeDiagnosticText(StringRef Role, StringRef Text, raw_ostream &OS) {
if (Text == "%0")
OS << "The text of this diagnostic is not controlled by Clang.\n\n";
else {
std::vector<std::string> Out;
DiagText(Role, Text).print(Out);
for (auto &Line : Out)
OS << Line << "\n";
OS << "\n";
}
}
} // namespace
} // namespace docs
void EmitClangDiagDocs(RecordKeeper &Records, raw_ostream &OS) {
using namespace docs;
// Get the documentation introduction paragraph.
const Record *Documentation = Records.getDef("GlobalDocumentation");
if (!Documentation) {
PrintFatalError("The Documentation top-level definition is missing, "
"no documentation will be generated.");
return;
}
OS << Documentation->getValueAsString("Intro") << "\n";
std::vector<Record*> Diags =
Records.getAllDerivedDefinitions("Diagnostic");
std::vector<Record*> DiagGroups =
Records.getAllDerivedDefinitions("DiagGroup");
std::sort(DiagGroups.begin(), DiagGroups.end(), diagGroupBeforeByName);
DiagGroupParentMap DGParentMap(Records);
std::map<std::string, GroupInfo> DiagsInGroup;
groupDiagnostics(Diags, DiagGroups, DiagsInGroup);
// Compute the set of diagnostics that are in -Wpedantic.
{
RecordSet DiagsInPedanticSet;
RecordSet GroupsInPedanticSet;
InferPedantic inferPedantic(DGParentMap, Diags, DiagGroups, DiagsInGroup);
inferPedantic.compute(&DiagsInPedanticSet, &GroupsInPedanticSet);
auto &PedDiags = DiagsInGroup["pedantic"];
// Put the diagnostics into a deterministic order.
RecordVec DiagsInPedantic(DiagsInPedanticSet.begin(),
DiagsInPedanticSet.end());
RecordVec GroupsInPedantic(GroupsInPedanticSet.begin(),
GroupsInPedanticSet.end());
std::sort(DiagsInPedantic.begin(), DiagsInPedantic.end(),
beforeThanCompare);
std::sort(GroupsInPedantic.begin(), GroupsInPedantic.end(),
beforeThanCompare);
PedDiags.DiagsInGroup.insert(PedDiags.DiagsInGroup.end(),
DiagsInPedantic.begin(),
DiagsInPedantic.end());
for (auto *Group : GroupsInPedantic)
PedDiags.SubGroups.push_back(Group->getValueAsString("GroupName"));
}
// FIXME: Write diagnostic categories and link to diagnostic groups in each.
// Write out the diagnostic groups.
for (const Record *G : DiagGroups) {
bool IsRemarkGroup = isRemarkGroup(G, DiagsInGroup);
auto &GroupInfo = DiagsInGroup[G->getValueAsString("GroupName")];
bool IsSynonym = GroupInfo.DiagsInGroup.empty() &&
GroupInfo.SubGroups.size() == 1;
writeHeader((IsRemarkGroup ? "-R" : "-W") +
G->getValueAsString("GroupName"),
OS);
if (!IsSynonym) {
// FIXME: Ideally, all the diagnostics in a group should have the same
// default state, but that is not currently the case.
auto DefaultSeverities = getDefaultSeverities(G, DiagsInGroup);
if (!DefaultSeverities.empty() && !DefaultSeverities.count("Ignored")) {
bool AnyNonErrors = DefaultSeverities.count("Warning") ||
DefaultSeverities.count("Remark");
if (!AnyNonErrors)
OS << "This diagnostic is an error by default, but the flag ``-Wno-"
<< G->getValueAsString("GroupName") << "`` can be used to disable "
<< "the error.\n\n";
else
OS << "This diagnostic is enabled by default.\n\n";
} else if (DefaultSeverities.size() > 1) {
OS << "Some of the diagnostics controlled by this flag are enabled "
<< "by default.\n\n";
}
}
if (!GroupInfo.SubGroups.empty()) {
if (IsSynonym)
OS << "Synonym for ";
else if (GroupInfo.DiagsInGroup.empty())
OS << "Controls ";
else
OS << "Also controls ";
bool First = true;
std::sort(GroupInfo.SubGroups.begin(), GroupInfo.SubGroups.end());
for (const auto &Name : GroupInfo.SubGroups) {
if (!First) OS << ", ";
OS << "`" << (IsRemarkGroup ? "-R" : "-W") << Name << "`_";
First = false;
}
OS << ".\n\n";
}
if (!GroupInfo.DiagsInGroup.empty()) {
OS << "**Diagnostic text:**\n\n";
for (const Record *D : GroupInfo.DiagsInGroup) {
auto Severity = getDefaultSeverity(D);
Severity[0] = tolower(Severity[0]);
if (Severity == "ignored")
Severity = IsRemarkGroup ? "remark" : "warning";
writeDiagnosticText(Severity, D->getValueAsString("Text"), OS);
}
}
auto Doc = G->getValueAsString("Documentation");
if (!Doc.empty())
OS << Doc;
else if (GroupInfo.SubGroups.empty() && GroupInfo.DiagsInGroup.empty())
OS << "This diagnostic flag exists for GCC compatibility, and has no "
"effect in Clang.\n";
OS << "\n";
}
}
} // end namespace clang
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