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llvm-project/clang/tools/libclang/CXLoadedDiagnostic.cpp

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//===-- CXLoadedDiagnostic.cpp - Handling of persisent diags ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Implements handling of persisent diagnostics.
//
//===----------------------------------------------------------------------===//
#include "CXLoadedDiagnostic.h"
#include "CXString.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/LLVM.h"
#include "clang/Frontend/SerializedDiagnosticReader.h"
#include "clang/Frontend/SerializedDiagnostics.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Bitcode/BitstreamReader.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MemoryBuffer.h"
using namespace clang;
//===----------------------------------------------------------------------===//
// Extend CXDiagnosticSetImpl which contains strings for diagnostics.
//===----------------------------------------------------------------------===//
typedef llvm::DenseMap<unsigned, const char *> Strings;
namespace {
class CXLoadedDiagnosticSetImpl : public CXDiagnosticSetImpl {
public:
CXLoadedDiagnosticSetImpl() : CXDiagnosticSetImpl(true), FakeFiles(FO) {}
virtual ~CXLoadedDiagnosticSetImpl() {}
llvm::BumpPtrAllocator Alloc;
Strings Categories;
Strings WarningFlags;
Strings FileNames;
FileSystemOptions FO;
FileManager FakeFiles;
llvm::DenseMap<unsigned, const FileEntry *> Files;
/// \brief Copy the string into our own allocator.
const char *copyString(StringRef Blob) {
char *mem = Alloc.Allocate<char>(Blob.size() + 1);
memcpy(mem, Blob.data(), Blob.size());
mem[Blob.size()] = '\0';
return mem;
}
};
}
//===----------------------------------------------------------------------===//
// Cleanup.
//===----------------------------------------------------------------------===//
CXLoadedDiagnostic::~CXLoadedDiagnostic() {}
//===----------------------------------------------------------------------===//
// Public CXLoadedDiagnostic methods.
//===----------------------------------------------------------------------===//
CXDiagnosticSeverity CXLoadedDiagnostic::getSeverity() const {
// FIXME: Fail more softly if the diagnostic level is unknown?
auto severityAsLevel = static_cast<serialized_diags::Level>(severity);
assert(severity == static_cast<unsigned>(severityAsLevel) &&
"unknown serialized diagnostic level");
switch (severityAsLevel) {
#define CASE(X) case serialized_diags::X: return CXDiagnostic_##X;
CASE(Ignored)
CASE(Note)
CASE(Warning)
CASE(Error)
CASE(Fatal)
#undef CASE
// The 'Remark' level isn't represented in the stable API.
case serialized_diags::Remark: return CXDiagnostic_Warning;
}
llvm_unreachable("Invalid diagnostic level");
}
static CXSourceLocation makeLocation(const CXLoadedDiagnostic::Location *DLoc) {
// The lowest bit of ptr_data[0] is always set to 1 to indicate this
// is a persistent diagnostic.
uintptr_t V = (uintptr_t) DLoc;
V |= 0x1;
CXSourceLocation Loc = { { (void*) V, nullptr }, 0 };
return Loc;
}
CXSourceLocation CXLoadedDiagnostic::getLocation() const {
// The lowest bit of ptr_data[0] is always set to 1 to indicate this
// is a persistent diagnostic.
return makeLocation(&DiagLoc);
}
CXString CXLoadedDiagnostic::getSpelling() const {
return cxstring::createRef(Spelling);
}
CXString CXLoadedDiagnostic::getDiagnosticOption(CXString *Disable) const {
if (DiagOption.empty())
return cxstring::createEmpty();
// FIXME: possibly refactor with logic in CXStoredDiagnostic.
if (Disable)
*Disable = cxstring::createDup((Twine("-Wno-") + DiagOption).str());
return cxstring::createDup((Twine("-W") + DiagOption).str());
}
unsigned CXLoadedDiagnostic::getCategory() const {
return category;
}
CXString CXLoadedDiagnostic::getCategoryText() const {
return cxstring::createDup(CategoryText);
}
unsigned CXLoadedDiagnostic::getNumRanges() const {
return Ranges.size();
}
CXSourceRange CXLoadedDiagnostic::getRange(unsigned Range) const {
assert(Range < Ranges.size());
return Ranges[Range];
}
unsigned CXLoadedDiagnostic::getNumFixIts() const {
return FixIts.size();
}
CXString CXLoadedDiagnostic::getFixIt(unsigned FixIt,
CXSourceRange *ReplacementRange) const {
assert(FixIt < FixIts.size());
if (ReplacementRange)
*ReplacementRange = FixIts[FixIt].first;
return cxstring::createRef(FixIts[FixIt].second);
}
void CXLoadedDiagnostic::decodeLocation(CXSourceLocation location,
CXFile *file,
unsigned int *line,
unsigned int *column,
unsigned int *offset) {
// CXSourceLocation consists of the following fields:
//
// void *ptr_data[2];
// unsigned int_data;
//
// The lowest bit of ptr_data[0] is always set to 1 to indicate this
// is a persistent diagnostic.
//
// For now, do the unoptimized approach and store the data in a side
// data structure. We can optimize this case later.
uintptr_t V = (uintptr_t) location.ptr_data[0];
assert((V & 0x1) == 1);
V &= ~(uintptr_t)1;
const Location &Loc = *((Location*)V);
if (file)
*file = Loc.file;
if (line)
*line = Loc.line;
if (column)
*column = Loc.column;
if (offset)
*offset = Loc.offset;
}
//===----------------------------------------------------------------------===//
// Deserialize diagnostics.
//===----------------------------------------------------------------------===//
namespace {
class DiagLoader : serialized_diags::SerializedDiagnosticReader {
enum CXLoadDiag_Error *error;
CXString *errorString;
std::unique_ptr<CXLoadedDiagnosticSetImpl> TopDiags;
SmallVector<std::unique_ptr<CXLoadedDiagnostic>, 8> CurrentDiags;
std::error_code reportBad(enum CXLoadDiag_Error code, llvm::StringRef err) {
if (error)
*error = code;
if (errorString)
*errorString = cxstring::createDup(err);
return serialized_diags::SDError::HandlerFailed;
}
std::error_code reportInvalidFile(llvm::StringRef err) {
return reportBad(CXLoadDiag_InvalidFile, err);
}
std::error_code readRange(const serialized_diags::Location &SDStart,
const serialized_diags::Location &SDEnd,
CXSourceRange &SR);
std::error_code readLocation(const serialized_diags::Location &SDLoc,
CXLoadedDiagnostic::Location &LoadedLoc);
protected:
std::error_code visitStartOfDiagnostic() override;
std::error_code visitEndOfDiagnostic() override;
std::error_code visitCategoryRecord(unsigned ID, StringRef Name) override;
std::error_code visitDiagFlagRecord(unsigned ID, StringRef Name) override;
std::error_code visitDiagnosticRecord(
unsigned Severity, const serialized_diags::Location &Location,
unsigned Category, unsigned Flag, StringRef Message) override;
std::error_code visitFilenameRecord(unsigned ID, unsigned Size,
unsigned Timestamp,
StringRef Name) override;
std::error_code visitFixitRecord(const serialized_diags::Location &Start,
const serialized_diags::Location &End,
StringRef CodeToInsert) override;
std::error_code
visitSourceRangeRecord(const serialized_diags::Location &Start,
const serialized_diags::Location &End) override;
public:
DiagLoader(enum CXLoadDiag_Error *e, CXString *es)
: SerializedDiagnosticReader(), error(e), errorString(es) {
if (error)
*error = CXLoadDiag_None;
if (errorString)
*errorString = cxstring::createEmpty();
}
CXDiagnosticSet load(const char *file);
};
}
CXDiagnosticSet DiagLoader::load(const char *file) {
TopDiags = llvm::make_unique<CXLoadedDiagnosticSetImpl>();
std::error_code EC = readDiagnostics(file);
if (EC) {
switch (EC.value()) {
case static_cast<int>(serialized_diags::SDError::HandlerFailed):
// We've already reported the problem.
break;
case static_cast<int>(serialized_diags::SDError::CouldNotLoad):
reportBad(CXLoadDiag_CannotLoad, EC.message());
break;
default:
reportInvalidFile(EC.message());
break;
}
return 0;
}
return (CXDiagnosticSet)TopDiags.release();
}
std::error_code
DiagLoader::readLocation(const serialized_diags::Location &SDLoc,
CXLoadedDiagnostic::Location &LoadedLoc) {
unsigned FileID = SDLoc.FileID;
if (FileID == 0)
LoadedLoc.file = nullptr;
else {
LoadedLoc.file = const_cast<FileEntry *>(TopDiags->Files[FileID]);
if (!LoadedLoc.file)
return reportInvalidFile("Corrupted file entry in source location");
}
LoadedLoc.line = SDLoc.Line;
LoadedLoc.column = SDLoc.Col;
LoadedLoc.offset = SDLoc.Offset;
return std::error_code();
}
std::error_code
DiagLoader::readRange(const serialized_diags::Location &SDStart,
const serialized_diags::Location &SDEnd,
CXSourceRange &SR) {
CXLoadedDiagnostic::Location *Start, *End;
Start = TopDiags->Alloc.Allocate<CXLoadedDiagnostic::Location>();
End = TopDiags->Alloc.Allocate<CXLoadedDiagnostic::Location>();
std::error_code EC;
if ((EC = readLocation(SDStart, *Start)))
return EC;
if ((EC = readLocation(SDEnd, *End)))
return EC;
CXSourceLocation startLoc = makeLocation(Start);
CXSourceLocation endLoc = makeLocation(End);
SR = clang_getRange(startLoc, endLoc);
return std::error_code();
}
std::error_code DiagLoader::visitStartOfDiagnostic() {
CurrentDiags.push_back(llvm::make_unique<CXLoadedDiagnostic>());
return std::error_code();
}
std::error_code DiagLoader::visitEndOfDiagnostic() {
auto D = CurrentDiags.pop_back_val();
if (CurrentDiags.empty())
TopDiags->appendDiagnostic(std::move(D));
else
CurrentDiags.back()->getChildDiagnostics().appendDiagnostic(std::move(D));
return std::error_code();
}
std::error_code DiagLoader::visitCategoryRecord(unsigned ID, StringRef Name) {
// FIXME: Why do we care about long strings?
if (Name.size() > 65536)
return reportInvalidFile("Out-of-bounds string in category");
TopDiags->Categories[ID] = TopDiags->copyString(Name);
return std::error_code();
}
std::error_code DiagLoader::visitDiagFlagRecord(unsigned ID, StringRef Name) {
// FIXME: Why do we care about long strings?
if (Name.size() > 65536)
return reportInvalidFile("Out-of-bounds string in warning flag");
TopDiags->WarningFlags[ID] = TopDiags->copyString(Name);
return std::error_code();
}
std::error_code DiagLoader::visitFilenameRecord(unsigned ID, unsigned Size,
unsigned Timestamp,
StringRef Name) {
// FIXME: Why do we care about long strings?
if (Name.size() > 65536)
return reportInvalidFile("Out-of-bounds string in filename");
TopDiags->FileNames[ID] = TopDiags->copyString(Name);
TopDiags->Files[ID] =
TopDiags->FakeFiles.getVirtualFile(Name, Size, Timestamp);
return std::error_code();
}
std::error_code
DiagLoader::visitSourceRangeRecord(const serialized_diags::Location &Start,
const serialized_diags::Location &End) {
CXSourceRange SR;
if (std::error_code EC = readRange(Start, End, SR))
return EC;
CurrentDiags.back()->Ranges.push_back(SR);
return std::error_code();
}
std::error_code
DiagLoader::visitFixitRecord(const serialized_diags::Location &Start,
const serialized_diags::Location &End,
StringRef CodeToInsert) {
CXSourceRange SR;
if (std::error_code EC = readRange(Start, End, SR))
return EC;
// FIXME: Why do we care about long strings?
if (CodeToInsert.size() > 65536)
return reportInvalidFile("Out-of-bounds string in FIXIT");
CurrentDiags.back()->FixIts.push_back(
std::make_pair(SR, TopDiags->copyString(CodeToInsert)));
return std::error_code();
}
std::error_code DiagLoader::visitDiagnosticRecord(
unsigned Severity, const serialized_diags::Location &Location,
unsigned Category, unsigned Flag, StringRef Message) {
CXLoadedDiagnostic &D = *CurrentDiags.back();
D.severity = Severity;
if (std::error_code EC = readLocation(Location, D.DiagLoc))
return EC;
D.category = Category;
D.DiagOption = Flag ? TopDiags->WarningFlags[Flag] : "";
D.CategoryText = Category ? TopDiags->Categories[Category] : "";
D.Spelling = TopDiags->copyString(Message);
return std::error_code();
}
extern "C" {
CXDiagnosticSet clang_loadDiagnostics(const char *file,
enum CXLoadDiag_Error *error,
CXString *errorString) {
DiagLoader L(error, errorString);
return L.load(file);
}
} // end extern 'C'.
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