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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/SerializedDiagnosticPrinter.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)
CASE(Remark)
#undef CASE
}
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, 0 }, 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.
//===----------------------------------------------------------------------===//
enum { MaxSupportedVersion = 2 };
typedef SmallVector<uint64_t, 64> RecordData;
enum LoadResult { Failure = 1, Success = 0 };
enum StreamResult { Read_EndOfStream,
Read_BlockBegin,
Read_Failure,
Read_Record,
Read_BlockEnd };
namespace {
class DiagLoader {
enum CXLoadDiag_Error *error;
CXString *errorString;
void reportBad(enum CXLoadDiag_Error code, llvm::StringRef err) {
if (error)
*error = code;
if (errorString)
*errorString = cxstring::createDup(err);
}
void reportInvalidFile(llvm::StringRef err) {
return reportBad(CXLoadDiag_InvalidFile, err);
}
LoadResult readMetaBlock(llvm::BitstreamCursor &Stream);
LoadResult readDiagnosticBlock(llvm::BitstreamCursor &Stream,
CXDiagnosticSetImpl &Diags,
CXLoadedDiagnosticSetImpl &TopDiags);
StreamResult readToNextRecordOrBlock(llvm::BitstreamCursor &Stream,
llvm::StringRef errorContext,
unsigned &BlockOrRecordID,
bool atTopLevel = false);
LoadResult readString(CXLoadedDiagnosticSetImpl &TopDiags,
Strings &strings, llvm::StringRef errorContext,
RecordData &Record,
StringRef Blob,
bool allowEmptyString = false);
LoadResult readString(CXLoadedDiagnosticSetImpl &TopDiags,
const char *&RetStr,
llvm::StringRef errorContext,
RecordData &Record,
StringRef Blob,
bool allowEmptyString = false);
LoadResult readRange(CXLoadedDiagnosticSetImpl &TopDiags,
RecordData &Record, unsigned RecStartIdx,
CXSourceRange &SR);
LoadResult readLocation(CXLoadedDiagnosticSetImpl &TopDiags,
RecordData &Record, unsigned &offset,
CXLoadedDiagnostic::Location &Loc);
public:
DiagLoader(enum CXLoadDiag_Error *e, CXString *es)
: 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) {
// Open the diagnostics file.
std::string ErrStr;
FileSystemOptions FO;
FileManager FileMgr(FO);
std::unique_ptr<llvm::MemoryBuffer> Buffer;
Buffer.reset(FileMgr.getBufferForFile(file));
if (!Buffer) {
reportBad(CXLoadDiag_CannotLoad, ErrStr);
return 0;
}
llvm::BitstreamReader StreamFile;
StreamFile.init((const unsigned char *)Buffer->getBufferStart(),
(const unsigned char *)Buffer->getBufferEnd());
llvm::BitstreamCursor Stream;
Stream.init(StreamFile);
// Sniff for the signature.
if (Stream.Read(8) != 'D' ||
Stream.Read(8) != 'I' ||
Stream.Read(8) != 'A' ||
Stream.Read(8) != 'G') {
reportBad(CXLoadDiag_InvalidFile,
"Bad header in diagnostics file");
return 0;
}
std::unique_ptr<CXLoadedDiagnosticSetImpl> Diags(
new CXLoadedDiagnosticSetImpl());
while (true) {
unsigned BlockID = 0;
StreamResult Res = readToNextRecordOrBlock(Stream, "Top-level",
BlockID, true);
switch (Res) {
case Read_EndOfStream:
return (CXDiagnosticSet)Diags.release();
case Read_Failure:
return 0;
case Read_Record:
llvm_unreachable("Top-level does not have records");
case Read_BlockEnd:
continue;
case Read_BlockBegin:
break;
}
switch (BlockID) {
case serialized_diags::BLOCK_META:
if (readMetaBlock(Stream))
return 0;
break;
case serialized_diags::BLOCK_DIAG:
if (readDiagnosticBlock(Stream, *Diags.get(), *Diags.get()))
return 0;
break;
default:
if (!Stream.SkipBlock()) {
reportInvalidFile("Malformed block at top-level of diagnostics file");
return 0;
}
break;
}
}
}
StreamResult DiagLoader::readToNextRecordOrBlock(llvm::BitstreamCursor &Stream,
llvm::StringRef errorContext,
unsigned &blockOrRecordID,
bool atTopLevel) {
blockOrRecordID = 0;
while (!Stream.AtEndOfStream()) {
unsigned Code = Stream.ReadCode();
// Handle the top-level specially.
if (atTopLevel) {
if (Code == llvm::bitc::ENTER_SUBBLOCK) {
unsigned BlockID = Stream.ReadSubBlockID();
if (BlockID == llvm::bitc::BLOCKINFO_BLOCK_ID) {
if (Stream.ReadBlockInfoBlock()) {
reportInvalidFile("Malformed BlockInfoBlock in diagnostics file");
return Read_Failure;
}
continue;
}
blockOrRecordID = BlockID;
return Read_BlockBegin;
}
reportInvalidFile("Only blocks can appear at the top of a "
"diagnostic file");
return Read_Failure;
}
switch ((llvm::bitc::FixedAbbrevIDs)Code) {
case llvm::bitc::ENTER_SUBBLOCK:
blockOrRecordID = Stream.ReadSubBlockID();
return Read_BlockBegin;
case llvm::bitc::END_BLOCK:
if (Stream.ReadBlockEnd()) {
reportInvalidFile("Cannot read end of block");
return Read_Failure;
}
return Read_BlockEnd;
case llvm::bitc::DEFINE_ABBREV:
Stream.ReadAbbrevRecord();
continue;
case llvm::bitc::UNABBREV_RECORD:
reportInvalidFile("Diagnostics file should have no unabbreviated "
"records");
return Read_Failure;
default:
// We found a record.
blockOrRecordID = Code;
return Read_Record;
}
}
if (atTopLevel)
return Read_EndOfStream;
reportInvalidFile(Twine("Premature end of diagnostics file within ").str() +
errorContext.str());
return Read_Failure;
}
LoadResult DiagLoader::readMetaBlock(llvm::BitstreamCursor &Stream) {
if (Stream.EnterSubBlock(clang::serialized_diags::BLOCK_META)) {
reportInvalidFile("Malformed metadata block");
return Failure;
}
bool versionChecked = false;
while (true) {
unsigned blockOrCode = 0;
StreamResult Res = readToNextRecordOrBlock(Stream, "Metadata Block",
blockOrCode);
switch(Res) {
case Read_EndOfStream:
llvm_unreachable("EndOfStream handled by readToNextRecordOrBlock");
case Read_Failure:
return Failure;
case Read_Record:
break;
case Read_BlockBegin:
if (Stream.SkipBlock()) {
reportInvalidFile("Malformed metadata block");
return Failure;
}
case Read_BlockEnd:
if (!versionChecked) {
reportInvalidFile("Diagnostics file does not contain version"
" information");
return Failure;
}
return Success;
}
RecordData Record;
unsigned recordID = Stream.readRecord(blockOrCode, Record);
if (recordID == serialized_diags::RECORD_VERSION) {
if (Record.size() < 1) {
reportInvalidFile("malformed VERSION identifier in diagnostics file");
return Failure;
}
if (Record[0] > MaxSupportedVersion) {
reportInvalidFile("diagnostics file is a newer version than the one "
"supported");
return Failure;
}
versionChecked = true;
}
}
}
LoadResult DiagLoader::readString(CXLoadedDiagnosticSetImpl &TopDiags,
const char *&RetStr,
llvm::StringRef errorContext,
RecordData &Record,
StringRef Blob,
bool allowEmptyString) {
// Basic buffer overflow check.
if (Blob.size() > 65536) {
reportInvalidFile(std::string("Out-of-bounds string in ") +
std::string(errorContext));
return Failure;
}
if (allowEmptyString && Record.size() >= 1 && Blob.size() == 0) {
RetStr = "";
return Success;
}
if (Record.size() < 1 || Blob.size() == 0) {
reportInvalidFile(std::string("Corrupted ") + std::string(errorContext)
+ std::string(" entry"));
return Failure;
}
RetStr = TopDiags.copyString(Blob);
return Success;
}
LoadResult DiagLoader::readString(CXLoadedDiagnosticSetImpl &TopDiags,
Strings &strings,
llvm::StringRef errorContext,
RecordData &Record,
StringRef Blob,
bool allowEmptyString) {
const char *RetStr;
if (readString(TopDiags, RetStr, errorContext, Record, Blob,
allowEmptyString))
return Failure;
strings[Record[0]] = RetStr;
return Success;
}
LoadResult DiagLoader::readLocation(CXLoadedDiagnosticSetImpl &TopDiags,
RecordData &Record, unsigned &offset,
CXLoadedDiagnostic::Location &Loc) {
if (Record.size() < offset + 3) {
reportInvalidFile("Corrupted source location");
return Failure;
}
unsigned fileID = Record[offset++];
if (fileID == 0) {
// Sentinel value.
Loc.file = 0;
Loc.line = 0;
Loc.column = 0;
Loc.offset = 0;
return Success;
}
const FileEntry *FE = TopDiags.Files[fileID];
if (!FE) {
reportInvalidFile("Corrupted file entry in source location");
return Failure;
}
Loc.file = const_cast<FileEntry *>(FE);
Loc.line = Record[offset++];
Loc.column = Record[offset++];
Loc.offset = Record[offset++];
return Success;
}
LoadResult DiagLoader::readRange(CXLoadedDiagnosticSetImpl &TopDiags,
RecordData &Record,
unsigned int RecStartIdx,
CXSourceRange &SR) {
CXLoadedDiagnostic::Location *Start, *End;
Start = TopDiags.Alloc.Allocate<CXLoadedDiagnostic::Location>();
End = TopDiags.Alloc.Allocate<CXLoadedDiagnostic::Location>();
if (readLocation(TopDiags, Record, RecStartIdx, *Start))
return Failure;
if (readLocation(TopDiags, Record, RecStartIdx, *End))
return Failure;
CXSourceLocation startLoc = makeLocation(Start);
CXSourceLocation endLoc = makeLocation(End);
SR = clang_getRange(startLoc, endLoc);
return Success;
}
LoadResult DiagLoader::readDiagnosticBlock(llvm::BitstreamCursor &Stream,
CXDiagnosticSetImpl &Diags,
CXLoadedDiagnosticSetImpl &TopDiags){
if (Stream.EnterSubBlock(clang::serialized_diags::BLOCK_DIAG)) {
reportInvalidFile("malformed diagnostic block");
return Failure;
}
std::unique_ptr<CXLoadedDiagnostic> D(new CXLoadedDiagnostic());
RecordData Record;
while (true) {
unsigned blockOrCode = 0;
StreamResult Res = readToNextRecordOrBlock(Stream, "Diagnostic Block",
blockOrCode);
switch (Res) {
case Read_EndOfStream:
llvm_unreachable("EndOfStream handled in readToNextRecordOrBlock");
case Read_Failure:
return Failure;
case Read_BlockBegin: {
// The only blocks we care about are subdiagnostics.
if (blockOrCode != serialized_diags::BLOCK_DIAG) {
if (!Stream.SkipBlock()) {
reportInvalidFile("Invalid subblock in Diagnostics block");
return Failure;
}
} else if (readDiagnosticBlock(Stream, D->getChildDiagnostics(),
TopDiags)) {
return Failure;
}
continue;
}
case Read_BlockEnd:
Diags.appendDiagnostic(D.release());
return Success;
case Read_Record:
break;
}
// Read the record.
Record.clear();
StringRef Blob;
unsigned recID = Stream.readRecord(blockOrCode, Record, &Blob);
if (recID < serialized_diags::RECORD_FIRST ||
recID > serialized_diags::RECORD_LAST)
continue;
switch ((serialized_diags::RecordIDs)recID) {
case serialized_diags::RECORD_VERSION:
continue;
case serialized_diags::RECORD_CATEGORY:
if (readString(TopDiags, TopDiags.Categories, "category", Record,
Blob, /* allowEmptyString */ true))
return Failure;
continue;
case serialized_diags::RECORD_DIAG_FLAG:
if (readString(TopDiags, TopDiags.WarningFlags, "warning flag", Record,
Blob))
return Failure;
continue;
case serialized_diags::RECORD_FILENAME: {
if (readString(TopDiags, TopDiags.FileNames, "filename", Record,
Blob))
return Failure;
if (Record.size() < 3) {
reportInvalidFile("Invalid file entry");
return Failure;
}
const FileEntry *FE =
TopDiags.FakeFiles.getVirtualFile(TopDiags.FileNames[Record[0]],
/* size */ Record[1],
/* time */ Record[2]);
TopDiags.Files[Record[0]] = FE;
continue;
}
case serialized_diags::RECORD_SOURCE_RANGE: {
CXSourceRange SR;
if (readRange(TopDiags, Record, 0, SR))
return Failure;
D->Ranges.push_back(SR);
continue;
}
case serialized_diags::RECORD_FIXIT: {
CXSourceRange SR;
if (readRange(TopDiags, Record, 0, SR))
return Failure;
const char *RetStr;
if (readString(TopDiags, RetStr, "FIXIT", Record, Blob,
/* allowEmptyString */ true))
return Failure;
D->FixIts.push_back(std::make_pair(SR, RetStr));
continue;
}
case serialized_diags::RECORD_DIAG: {
D->severity = Record[0];
unsigned offset = 1;
if (readLocation(TopDiags, Record, offset, D->DiagLoc))
return Failure;
D->category = Record[offset++];
unsigned diagFlag = Record[offset++];
D->DiagOption = diagFlag ? TopDiags.WarningFlags[diagFlag] : "";
D->CategoryText = D->category ? TopDiags.Categories[D->category] : "";
D->Spelling = TopDiags.copyString(Blob);
continue;
}
}
}
}
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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