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clang-1/lib/Frontend/PCHReader.cpp

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//===--- PCHReader.cpp - Precompiled Headers Reader -------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the PCHReader class, which reads a precompiled header.
//
//===----------------------------------------------------------------------===//
#include "clang/Frontend/PCHReader.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "../Sema/Sema.h" // FIXME: move Sema headers elsewhere
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Expr.h"
#include "clang/AST/Type.h"
#include "clang/Lex/MacroInfo.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Basic/OnDiskHashTable.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/SourceManagerInternals.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/Bitcode/BitstreamReader.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/MemoryBuffer.h"
#include <algorithm>
#include <iterator>
#include <cstdio>
#include <sys/stat.h>
using namespace clang;
//===----------------------------------------------------------------------===//
// PCH reader validator implementation
//===----------------------------------------------------------------------===//
PCHReaderListener::~PCHReaderListener() {}
bool
PCHValidator::ReadLanguageOptions(const LangOptions &LangOpts) {
const LangOptions &PPLangOpts = PP.getLangOptions();
#define PARSE_LANGOPT_BENIGN(Option)
#define PARSE_LANGOPT_IMPORTANT(Option, DiagID) \
if (PPLangOpts.Option != LangOpts.Option) { \
Reader.Diag(DiagID) << LangOpts.Option << PPLangOpts.Option; \
return true; \
}
PARSE_LANGOPT_BENIGN(Trigraphs);
PARSE_LANGOPT_BENIGN(BCPLComment);
PARSE_LANGOPT_BENIGN(DollarIdents);
PARSE_LANGOPT_BENIGN(AsmPreprocessor);
PARSE_LANGOPT_IMPORTANT(GNUMode, diag::warn_pch_gnu_extensions);
PARSE_LANGOPT_BENIGN(ImplicitInt);
PARSE_LANGOPT_BENIGN(Digraphs);
PARSE_LANGOPT_BENIGN(HexFloats);
PARSE_LANGOPT_IMPORTANT(C99, diag::warn_pch_c99);
PARSE_LANGOPT_IMPORTANT(Microsoft, diag::warn_pch_microsoft_extensions);
PARSE_LANGOPT_IMPORTANT(CPlusPlus, diag::warn_pch_cplusplus);
PARSE_LANGOPT_IMPORTANT(CPlusPlus0x, diag::warn_pch_cplusplus0x);
PARSE_LANGOPT_BENIGN(CXXOperatorName);
PARSE_LANGOPT_IMPORTANT(ObjC1, diag::warn_pch_objective_c);
PARSE_LANGOPT_IMPORTANT(ObjC2, diag::warn_pch_objective_c2);
PARSE_LANGOPT_IMPORTANT(ObjCNonFragileABI, diag::warn_pch_nonfragile_abi);
PARSE_LANGOPT_BENIGN(PascalStrings);
PARSE_LANGOPT_BENIGN(WritableStrings);
PARSE_LANGOPT_IMPORTANT(LaxVectorConversions,
diag::warn_pch_lax_vector_conversions);
PARSE_LANGOPT_IMPORTANT(AltiVec, diag::warn_pch_altivec);
PARSE_LANGOPT_IMPORTANT(Exceptions, diag::warn_pch_exceptions);
PARSE_LANGOPT_IMPORTANT(NeXTRuntime, diag::warn_pch_objc_runtime);
PARSE_LANGOPT_IMPORTANT(Freestanding, diag::warn_pch_freestanding);
PARSE_LANGOPT_IMPORTANT(NoBuiltin, diag::warn_pch_builtins);
PARSE_LANGOPT_IMPORTANT(ThreadsafeStatics,
diag::warn_pch_thread_safe_statics);
PARSE_LANGOPT_IMPORTANT(Blocks, diag::warn_pch_blocks);
PARSE_LANGOPT_BENIGN(EmitAllDecls);
PARSE_LANGOPT_IMPORTANT(MathErrno, diag::warn_pch_math_errno);
PARSE_LANGOPT_IMPORTANT(OverflowChecking, diag::warn_pch_overflow_checking);
PARSE_LANGOPT_IMPORTANT(HeinousExtensions,
diag::warn_pch_heinous_extensions);
// FIXME: Most of the options below are benign if the macro wasn't
// used. Unfortunately, this means that a PCH compiled without
// optimization can't be used with optimization turned on, even
// though the only thing that changes is whether __OPTIMIZE__ was
// defined... but if __OPTIMIZE__ never showed up in the header, it
// doesn't matter. We could consider making this some special kind
// of check.
PARSE_LANGOPT_IMPORTANT(Optimize, diag::warn_pch_optimize);
PARSE_LANGOPT_IMPORTANT(OptimizeSize, diag::warn_pch_optimize_size);
PARSE_LANGOPT_IMPORTANT(Static, diag::warn_pch_static);
PARSE_LANGOPT_IMPORTANT(PICLevel, diag::warn_pch_pic_level);
PARSE_LANGOPT_IMPORTANT(GNUInline, diag::warn_pch_gnu_inline);
PARSE_LANGOPT_IMPORTANT(NoInline, diag::warn_pch_no_inline);
PARSE_LANGOPT_IMPORTANT(AccessControl, diag::warn_pch_access_control);
PARSE_LANGOPT_IMPORTANT(CharIsSigned, diag::warn_pch_char_signed);
if ((PPLangOpts.getGCMode() != 0) != (LangOpts.getGCMode() != 0)) {
Reader.Diag(diag::warn_pch_gc_mode)
<< LangOpts.getGCMode() << PPLangOpts.getGCMode();
return true;
}
PARSE_LANGOPT_BENIGN(getVisibilityMode());
PARSE_LANGOPT_BENIGN(InstantiationDepth);
PARSE_LANGOPT_IMPORTANT(OpenCL, diag::warn_pch_opencl);
#undef PARSE_LANGOPT_IRRELEVANT
#undef PARSE_LANGOPT_BENIGN
return false;
}
bool PCHValidator::ReadTargetTriple(const std::string &Triple) {
if (Triple != PP.getTargetInfo().getTargetTriple()) {
Reader.Diag(diag::warn_pch_target_triple)
<< Triple << PP.getTargetInfo().getTargetTriple();
return true;
}
return false;
}
/// \brief Split the given string into a vector of lines, eliminating
/// any empty lines in the process.
///
/// \param Str the string to split.
/// \param Len the length of Str.
/// \param KeepEmptyLines true if empty lines should be included
/// \returns a vector of lines, with the line endings removed
static std::vector<std::string> splitLines(const char *Str, unsigned Len,
bool KeepEmptyLines = false) {
std::vector<std::string> Lines;
for (unsigned LineStart = 0; LineStart < Len; ++LineStart) {
unsigned LineEnd = LineStart;
while (LineEnd < Len && Str[LineEnd] != '\n')
++LineEnd;
if (LineStart != LineEnd || KeepEmptyLines)
Lines.push_back(std::string(&Str[LineStart], &Str[LineEnd]));
LineStart = LineEnd;
}
return Lines;
}
/// \brief Determine whether the string Haystack starts with the
/// substring Needle.
static bool startsWith(const std::string &Haystack, const char *Needle) {
for (unsigned I = 0, N = Haystack.size(); Needle[I] != 0; ++I) {
if (I == N)
return false;
if (Haystack[I] != Needle[I])
return false;
}
return true;
}
/// \brief Determine whether the string Haystack starts with the
/// substring Needle.
static inline bool startsWith(const std::string &Haystack,
const std::string &Needle) {
return startsWith(Haystack, Needle.c_str());
}
bool PCHValidator::ReadPredefinesBuffer(const char *PCHPredef,
unsigned PCHPredefLen,
FileID PCHBufferID,
std::string &SuggestedPredefines) {
const char *Predef = PP.getPredefines().c_str();
unsigned PredefLen = PP.getPredefines().size();
// If the two predefines buffers compare equal, we're done!
if (PredefLen == PCHPredefLen &&
strncmp(Predef, PCHPredef, PCHPredefLen) == 0)
return false;
SourceManager &SourceMgr = PP.getSourceManager();
// The predefines buffers are different. Determine what the
// differences are, and whether they require us to reject the PCH
// file.
std::vector<std::string> CmdLineLines = splitLines(Predef, PredefLen);
std::vector<std::string> PCHLines = splitLines(PCHPredef, PCHPredefLen);
// Sort both sets of predefined buffer lines, since
std::sort(CmdLineLines.begin(), CmdLineLines.end());
std::sort(PCHLines.begin(), PCHLines.end());
// Determine which predefines that where used to build the PCH file
// are missing from the command line.
std::vector<std::string> MissingPredefines;
std::set_difference(PCHLines.begin(), PCHLines.end(),
CmdLineLines.begin(), CmdLineLines.end(),
std::back_inserter(MissingPredefines));
bool MissingDefines = false;
bool ConflictingDefines = false;
for (unsigned I = 0, N = MissingPredefines.size(); I != N; ++I) {
const std::string &Missing = MissingPredefines[I];
if (!startsWith(Missing, "#define ") != 0) {
Reader.Diag(diag::warn_pch_compiler_options_mismatch);
return true;
}
// This is a macro definition. Determine the name of the macro
// we're defining.
std::string::size_type StartOfMacroName = strlen("#define ");
std::string::size_type EndOfMacroName
= Missing.find_first_of("( \n\r", StartOfMacroName);
assert(EndOfMacroName != std::string::npos &&
"Couldn't find the end of the macro name");
std::string MacroName = Missing.substr(StartOfMacroName,
EndOfMacroName - StartOfMacroName);
// Determine whether this macro was given a different definition
// on the command line.
std::string MacroDefStart = "#define " + MacroName;
std::string::size_type MacroDefLen = MacroDefStart.size();
std::vector<std::string>::iterator ConflictPos
= std::lower_bound(CmdLineLines.begin(), CmdLineLines.end(),
MacroDefStart);
for (; ConflictPos != CmdLineLines.end(); ++ConflictPos) {
if (!startsWith(*ConflictPos, MacroDefStart)) {
// Different macro; we're done.
ConflictPos = CmdLineLines.end();
break;
}
assert(ConflictPos->size() > MacroDefLen &&
"Invalid #define in predefines buffer?");
if ((*ConflictPos)[MacroDefLen] != ' ' &&
(*ConflictPos)[MacroDefLen] != '(')
continue; // Longer macro name; keep trying.
// We found a conflicting macro definition.
break;
}
if (ConflictPos != CmdLineLines.end()) {
Reader.Diag(diag::warn_cmdline_conflicting_macro_def)
<< MacroName;
// Show the definition of this macro within the PCH file.
const char *MissingDef = strstr(PCHPredef, Missing.c_str());
unsigned Offset = MissingDef - PCHPredef;
SourceLocation PCHMissingLoc
= SourceMgr.getLocForStartOfFile(PCHBufferID)
.getFileLocWithOffset(Offset);
Reader.Diag(PCHMissingLoc, diag::note_pch_macro_defined_as)
<< MacroName;
ConflictingDefines = true;
continue;
}
// If the macro doesn't conflict, then we'll just pick up the
// macro definition from the PCH file. Warn the user that they
// made a mistake.
if (ConflictingDefines)
continue; // Don't complain if there are already conflicting defs
if (!MissingDefines) {
Reader.Diag(diag::warn_cmdline_missing_macro_defs);
MissingDefines = true;
}
// Show the definition of this macro within the PCH file.
const char *MissingDef = strstr(PCHPredef, Missing.c_str());
unsigned Offset = MissingDef - PCHPredef;
SourceLocation PCHMissingLoc
= SourceMgr.getLocForStartOfFile(PCHBufferID)
.getFileLocWithOffset(Offset);
Reader.Diag(PCHMissingLoc, diag::note_using_macro_def_from_pch);
}
if (ConflictingDefines)
return true;
// Determine what predefines were introduced based on command-line
// parameters that were not present when building the PCH
// file. Extra #defines are okay, so long as the identifiers being
// defined were not used within the precompiled header.
std::vector<std::string> ExtraPredefines;
std::set_difference(CmdLineLines.begin(), CmdLineLines.end(),
PCHLines.begin(), PCHLines.end(),
std::back_inserter(ExtraPredefines));
for (unsigned I = 0, N = ExtraPredefines.size(); I != N; ++I) {
const std::string &Extra = ExtraPredefines[I];
if (!startsWith(Extra, "#define ") != 0) {
Reader.Diag(diag::warn_pch_compiler_options_mismatch);
return true;
}
// This is an extra macro definition. Determine the name of the
// macro we're defining.
std::string::size_type StartOfMacroName = strlen("#define ");
std::string::size_type EndOfMacroName
= Extra.find_first_of("( \n\r", StartOfMacroName);
assert(EndOfMacroName != std::string::npos &&
"Couldn't find the end of the macro name");
std::string MacroName = Extra.substr(StartOfMacroName,
EndOfMacroName - StartOfMacroName);
// Check whether this name was used somewhere in the PCH file. If
// so, defining it as a macro could change behavior, so we reject
// the PCH file.
if (IdentifierInfo *II = Reader.get(MacroName.c_str(),
MacroName.c_str() + MacroName.size())) {
Reader.Diag(diag::warn_macro_name_used_in_pch)
<< II;
return true;
}
// Add this definition to the suggested predefines buffer.
SuggestedPredefines += Extra;
SuggestedPredefines += '\n';
}
// If we get here, it's because the predefines buffer had compatible
// contents. Accept the PCH file.
return false;
}
void PCHValidator::ReadHeaderFileInfo(const HeaderFileInfo &HFI) {
PP.getHeaderSearchInfo().setHeaderFileInfoForUID(HFI, NumHeaderInfos++);
}
void PCHValidator::ReadCounter(unsigned Value) {
PP.setCounterValue(Value);
}
//===----------------------------------------------------------------------===//
// PCH reader implementation
//===----------------------------------------------------------------------===//
PCHReader::PCHReader(Preprocessor &PP, ASTContext *Context,
const char *isysroot)
: Listener(new PCHValidator(PP, *this)), SourceMgr(PP.getSourceManager()),
FileMgr(PP.getFileManager()), Diags(PP.getDiagnostics()),
SemaObj(0), PP(&PP), Context(Context), Consumer(0),
IdentifierTableData(0), IdentifierLookupTable(0),
IdentifierOffsets(0),
MethodPoolLookupTable(0), MethodPoolLookupTableData(0),
TotalSelectorsInMethodPool(0), SelectorOffsets(0),
TotalNumSelectors(0), Comments(0), NumComments(0), isysroot(isysroot),
NumStatHits(0), NumStatMisses(0),
NumSLocEntriesRead(0), NumStatementsRead(0),
NumMacrosRead(0), NumMethodPoolSelectorsRead(0), NumMethodPoolMisses(0),
NumLexicalDeclContextsRead(0), NumVisibleDeclContextsRead(0),
CurrentlyLoadingTypeOrDecl(0) {
RelocatablePCH = false;
}
PCHReader::PCHReader(SourceManager &SourceMgr, FileManager &FileMgr,
Diagnostic &Diags, const char *isysroot)
: SourceMgr(SourceMgr), FileMgr(FileMgr), Diags(Diags),
SemaObj(0), PP(0), Context(0), Consumer(0),
IdentifierTableData(0), IdentifierLookupTable(0),
IdentifierOffsets(0),
MethodPoolLookupTable(0), MethodPoolLookupTableData(0),
TotalSelectorsInMethodPool(0), SelectorOffsets(0),
TotalNumSelectors(0), Comments(0), NumComments(0), isysroot(isysroot),
NumStatHits(0), NumStatMisses(0),
NumSLocEntriesRead(0), NumStatementsRead(0),
NumMacrosRead(0), NumMethodPoolSelectorsRead(0), NumMethodPoolMisses(0),
NumLexicalDeclContextsRead(0), NumVisibleDeclContextsRead(0),
CurrentlyLoadingTypeOrDecl(0) {
RelocatablePCH = false;
}
PCHReader::~PCHReader() {}
Expr *PCHReader::ReadDeclExpr() {
return dyn_cast_or_null<Expr>(ReadStmt(DeclsCursor));
}
Expr *PCHReader::ReadTypeExpr() {
return dyn_cast_or_null<Expr>(ReadStmt(Stream));
}
namespace {
class VISIBILITY_HIDDEN PCHMethodPoolLookupTrait {
PCHReader &Reader;
public:
typedef std::pair<ObjCMethodList, ObjCMethodList> data_type;
typedef Selector external_key_type;
typedef external_key_type internal_key_type;
explicit PCHMethodPoolLookupTrait(PCHReader &Reader) : Reader(Reader) { }
static bool EqualKey(const internal_key_type& a,
const internal_key_type& b) {
return a == b;
}
static unsigned ComputeHash(Selector Sel) {
unsigned N = Sel.getNumArgs();
if (N == 0)
++N;
unsigned R = 5381;
for (unsigned I = 0; I != N; ++I)
if (IdentifierInfo *II = Sel.getIdentifierInfoForSlot(I))
R = clang::BernsteinHashPartial(II->getName(), II->getLength(), R);
return R;
}
// This hopefully will just get inlined and removed by the optimizer.
static const internal_key_type&
GetInternalKey(const external_key_type& x) { return x; }
static std::pair<unsigned, unsigned>
ReadKeyDataLength(const unsigned char*& d) {
using namespace clang::io;
unsigned KeyLen = ReadUnalignedLE16(d);
unsigned DataLen = ReadUnalignedLE16(d);
return std::make_pair(KeyLen, DataLen);
}
internal_key_type ReadKey(const unsigned char* d, unsigned) {
using namespace clang::io;
SelectorTable &SelTable = Reader.getContext()->Selectors;
unsigned N = ReadUnalignedLE16(d);
IdentifierInfo *FirstII
= Reader.DecodeIdentifierInfo(ReadUnalignedLE32(d));
if (N == 0)
return SelTable.getNullarySelector(FirstII);
else if (N == 1)
return SelTable.getUnarySelector(FirstII);
llvm::SmallVector<IdentifierInfo *, 16> Args;
Args.push_back(FirstII);
for (unsigned I = 1; I != N; ++I)
Args.push_back(Reader.DecodeIdentifierInfo(ReadUnalignedLE32(d)));
return SelTable.getSelector(N, Args.data());
}
data_type ReadData(Selector, const unsigned char* d, unsigned DataLen) {
using namespace clang::io;
unsigned NumInstanceMethods = ReadUnalignedLE16(d);
unsigned NumFactoryMethods = ReadUnalignedLE16(d);
data_type Result;
// Load instance methods
ObjCMethodList *Prev = 0;
for (unsigned I = 0; I != NumInstanceMethods; ++I) {
ObjCMethodDecl *Method
= cast<ObjCMethodDecl>(Reader.GetDecl(ReadUnalignedLE32(d)));
if (!Result.first.Method) {
// This is the first method, which is the easy case.
Result.first.Method = Method;
Prev = &Result.first;
continue;
}
Prev->Next = new ObjCMethodList(Method, 0);
Prev = Prev->Next;
}
// Load factory methods
Prev = 0;
for (unsigned I = 0; I != NumFactoryMethods; ++I) {
ObjCMethodDecl *Method
= cast<ObjCMethodDecl>(Reader.GetDecl(ReadUnalignedLE32(d)));
if (!Result.second.Method) {
// This is the first method, which is the easy case.
Result.second.Method = Method;
Prev = &Result.second;
continue;
}
Prev->Next = new ObjCMethodList(Method, 0);
Prev = Prev->Next;
}
return Result;
}
};
} // end anonymous namespace
/// \brief The on-disk hash table used for the global method pool.
typedef OnDiskChainedHashTable<PCHMethodPoolLookupTrait>
PCHMethodPoolLookupTable;
namespace {
class VISIBILITY_HIDDEN PCHIdentifierLookupTrait {
PCHReader &Reader;
// If we know the IdentifierInfo in advance, it is here and we will
// not build a new one. Used when deserializing information about an
// identifier that was constructed before the PCH file was read.
IdentifierInfo *KnownII;
public:
typedef IdentifierInfo * data_type;
typedef const std::pair<const char*, unsigned> external_key_type;
typedef external_key_type internal_key_type;
explicit PCHIdentifierLookupTrait(PCHReader &Reader, IdentifierInfo *II = 0)
: Reader(Reader), KnownII(II) { }
static bool EqualKey(const internal_key_type& a,
const internal_key_type& b) {
return (a.second == b.second) ? memcmp(a.first, b.first, a.second) == 0
: false;
}
static unsigned ComputeHash(const internal_key_type& a) {
return BernsteinHash(a.first, a.second);
}
// This hopefully will just get inlined and removed by the optimizer.
static const internal_key_type&
GetInternalKey(const external_key_type& x) { return x; }
static std::pair<unsigned, unsigned>
ReadKeyDataLength(const unsigned char*& d) {
using namespace clang::io;
unsigned DataLen = ReadUnalignedLE16(d);
unsigned KeyLen = ReadUnalignedLE16(d);
return std::make_pair(KeyLen, DataLen);
}
static std::pair<const char*, unsigned>
ReadKey(const unsigned char* d, unsigned n) {
assert(n >= 2 && d[n-1] == '\0');
return std::make_pair((const char*) d, n-1);
}
IdentifierInfo *ReadData(const internal_key_type& k,
const unsigned char* d,
unsigned DataLen) {
using namespace clang::io;
pch::IdentID ID = ReadUnalignedLE32(d);
bool IsInteresting = ID & 0x01;
// Wipe out the "is interesting" bit.
ID = ID >> 1;
if (!IsInteresting) {
// For unintersting identifiers, just build the IdentifierInfo
// and associate it with the persistent ID.
IdentifierInfo *II = KnownII;
if (!II)
II = &Reader.getIdentifierTable().CreateIdentifierInfo(
k.first, k.first + k.second);
Reader.SetIdentifierInfo(ID, II);
return II;
}
unsigned Bits = ReadUnalignedLE16(d);
bool CPlusPlusOperatorKeyword = Bits & 0x01;
Bits >>= 1;
bool Poisoned = Bits & 0x01;
Bits >>= 1;
bool ExtensionToken = Bits & 0x01;
Bits >>= 1;
bool hasMacroDefinition = Bits & 0x01;
Bits >>= 1;
unsigned ObjCOrBuiltinID = Bits & 0x3FF;
Bits >>= 10;
assert(Bits == 0 && "Extra bits in the identifier?");
DataLen -= 6;
// Build the IdentifierInfo itself and link the identifier ID with
// the new IdentifierInfo.
IdentifierInfo *II = KnownII;
if (!II)
II = &Reader.getIdentifierTable().CreateIdentifierInfo(
k.first, k.first + k.second);
Reader.SetIdentifierInfo(ID, II);
// Set or check the various bits in the IdentifierInfo structure.
// FIXME: Load token IDs lazily, too?
II->setObjCOrBuiltinID(ObjCOrBuiltinID);
assert(II->isExtensionToken() == ExtensionToken &&
"Incorrect extension token flag");
(void)ExtensionToken;
II->setIsPoisoned(Poisoned);
assert(II->isCPlusPlusOperatorKeyword() == CPlusPlusOperatorKeyword &&
"Incorrect C++ operator keyword flag");
(void)CPlusPlusOperatorKeyword;
// If this identifier is a macro, deserialize the macro
// definition.
if (hasMacroDefinition) {
uint32_t Offset = ReadUnalignedLE32(d);
Reader.ReadMacroRecord(Offset);
DataLen -= 4;
}
// Read all of the declarations visible at global scope with this
// name.
if (Reader.getContext() == 0) return II;
if (DataLen > 0) {
llvm::SmallVector<uint32_t, 4> DeclIDs;
for (; DataLen > 0; DataLen -= 4)
DeclIDs.push_back(ReadUnalignedLE32(d));
Reader.SetGloballyVisibleDecls(II, DeclIDs);
}
return II;
}
};
} // end anonymous namespace
/// \brief The on-disk hash table used to contain information about
/// all of the identifiers in the program.
typedef OnDiskChainedHashTable<PCHIdentifierLookupTrait>
PCHIdentifierLookupTable;
bool PCHReader::Error(const char *Msg) {
unsigned DiagID = Diags.getCustomDiagID(Diagnostic::Fatal, Msg);
Diag(DiagID);
return true;
}
/// \brief Check the contents of the predefines buffer against the
/// contents of the predefines buffer used to build the PCH file.
///
/// The contents of the two predefines buffers should be the same. If
/// not, then some command-line option changed the preprocessor state
/// and we must reject the PCH file.
///
/// \param PCHPredef The start of the predefines buffer in the PCH
/// file.
///
/// \param PCHPredefLen The length of the predefines buffer in the PCH
/// file.
///
/// \param PCHBufferID The FileID for the PCH predefines buffer.
///
/// \returns true if there was a mismatch (in which case the PCH file
/// should be ignored), or false otherwise.
bool PCHReader::CheckPredefinesBuffer(const char *PCHPredef,
unsigned PCHPredefLen,
FileID PCHBufferID) {
if (Listener)
return Listener->ReadPredefinesBuffer(PCHPredef, PCHPredefLen, PCHBufferID,
SuggestedPredefines);
return false;
}
//===----------------------------------------------------------------------===//
// Source Manager Deserialization
//===----------------------------------------------------------------------===//
/// \brief Read the line table in the source manager block.
/// \returns true if ther was an error.
bool PCHReader::ParseLineTable(llvm::SmallVectorImpl<uint64_t> &Record) {
unsigned Idx = 0;
LineTableInfo &LineTable = SourceMgr.getLineTable();
// Parse the file names
std::map<int, int> FileIDs;
for (int I = 0, N = Record[Idx++]; I != N; ++I) {
// Extract the file name
unsigned FilenameLen = Record[Idx++];
std::string Filename(&Record[Idx], &Record[Idx] + FilenameLen);
Idx += FilenameLen;
MaybeAddSystemRootToFilename(Filename);
FileIDs[I] = LineTable.getLineTableFilenameID(Filename.c_str(),
Filename.size());
}
// Parse the line entries
std::vector<LineEntry> Entries;
while (Idx < Record.size()) {
int FID = FileIDs[Record[Idx++]];
// Extract the line entries
unsigned NumEntries = Record[Idx++];
Entries.clear();
Entries.reserve(NumEntries);
for (unsigned I = 0; I != NumEntries; ++I) {
unsigned FileOffset = Record[Idx++];
unsigned LineNo = Record[Idx++];
int FilenameID = Record[Idx++];
SrcMgr::CharacteristicKind FileKind
= (SrcMgr::CharacteristicKind)Record[Idx++];
unsigned IncludeOffset = Record[Idx++];
Entries.push_back(LineEntry::get(FileOffset, LineNo, FilenameID,
FileKind, IncludeOffset));
}
LineTable.AddEntry(FID, Entries);
}
return false;
}
namespace {
class VISIBILITY_HIDDEN PCHStatData {
public:
const bool hasStat;
const ino_t ino;
const dev_t dev;
const mode_t mode;
const time_t mtime;
const off_t size;
PCHStatData(ino_t i, dev_t d, mode_t mo, time_t m, off_t s)
: hasStat(true), ino(i), dev(d), mode(mo), mtime(m), size(s) {}
PCHStatData()
: hasStat(false), ino(0), dev(0), mode(0), mtime(0), size(0) {}
};
class VISIBILITY_HIDDEN PCHStatLookupTrait {
public:
typedef const char *external_key_type;
typedef const char *internal_key_type;
typedef PCHStatData data_type;
static unsigned ComputeHash(const char *path) {
return BernsteinHash(path);
}
static internal_key_type GetInternalKey(const char *path) { return path; }
static bool EqualKey(internal_key_type a, internal_key_type b) {
return strcmp(a, b) == 0;
}
static std::pair<unsigned, unsigned>
ReadKeyDataLength(const unsigned char*& d) {
unsigned KeyLen = (unsigned) clang::io::ReadUnalignedLE16(d);
unsigned DataLen = (unsigned) *d++;
return std::make_pair(KeyLen + 1, DataLen);
}
static internal_key_type ReadKey(const unsigned char *d, unsigned) {
return (const char *)d;
}
static data_type ReadData(const internal_key_type, const unsigned char *d,
unsigned /*DataLen*/) {
using namespace clang::io;
if (*d++ == 1)
return data_type();
ino_t ino = (ino_t) ReadUnalignedLE32(d);
dev_t dev = (dev_t) ReadUnalignedLE32(d);
mode_t mode = (mode_t) ReadUnalignedLE16(d);
time_t mtime = (time_t) ReadUnalignedLE64(d);
off_t size = (off_t) ReadUnalignedLE64(d);
return data_type(ino, dev, mode, mtime, size);
}
};
/// \brief stat() cache for precompiled headers.
///
/// This cache is very similar to the stat cache used by pretokenized
/// headers.
class VISIBILITY_HIDDEN PCHStatCache : public StatSysCallCache {
typedef OnDiskChainedHashTable<PCHStatLookupTrait> CacheTy;
CacheTy *Cache;
unsigned &NumStatHits, &NumStatMisses;
public:
PCHStatCache(const unsigned char *Buckets,
const unsigned char *Base,
unsigned &NumStatHits,
unsigned &NumStatMisses)
: Cache(0), NumStatHits(NumStatHits), NumStatMisses(NumStatMisses) {
Cache = CacheTy::Create(Buckets, Base);
}
~PCHStatCache() { delete Cache; }
int stat(const char *path, struct stat *buf) {
// Do the lookup for the file's data in the PCH file.
CacheTy::iterator I = Cache->find(path);
// If we don't get a hit in the PCH file just forward to 'stat'.
if (I == Cache->end()) {
++NumStatMisses;
return ::stat(path, buf);
}
++NumStatHits;
PCHStatData Data = *I;
if (!Data.hasStat)
return 1;
buf->st_ino = Data.ino;
buf->st_dev = Data.dev;
buf->st_mtime = Data.mtime;
buf->st_mode = Data.mode;
buf->st_size = Data.size;
return 0;
}
};
} // end anonymous namespace
/// \brief Read the source manager block
PCHReader::PCHReadResult PCHReader::ReadSourceManagerBlock() {
using namespace SrcMgr;
// Set the source-location entry cursor to the current position in
// the stream. This cursor will be used to read the contents of the
// source manager block initially, and then lazily read
// source-location entries as needed.
SLocEntryCursor = Stream;
// The stream itself is going to skip over the source manager block.
if (Stream.SkipBlock()) {
Error("malformed block record in PCH file");
return Failure;
}
// Enter the source manager block.
if (SLocEntryCursor.EnterSubBlock(pch::SOURCE_MANAGER_BLOCK_ID)) {
Error("malformed source manager block record in PCH file");
return Failure;
}
RecordData Record;
while (true) {
unsigned Code = SLocEntryCursor.ReadCode();
if (Code == llvm::bitc::END_BLOCK) {
if (SLocEntryCursor.ReadBlockEnd()) {
Error("error at end of Source Manager block in PCH file");
return Failure;
}
return Success;
}
if (Code == llvm::bitc::ENTER_SUBBLOCK) {
// No known subblocks, always skip them.
SLocEntryCursor.ReadSubBlockID();
if (SLocEntryCursor.SkipBlock()) {
Error("malformed block record in PCH file");
return Failure;
}
continue;
}
if (Code == llvm::bitc::DEFINE_ABBREV) {
SLocEntryCursor.ReadAbbrevRecord();
continue;
}
// Read a record.
const char *BlobStart;
unsigned BlobLen;
Record.clear();
switch (SLocEntryCursor.ReadRecord(Code, Record, &BlobStart, &BlobLen)) {
default: // Default behavior: ignore.
break;
case pch::SM_LINE_TABLE:
if (ParseLineTable(Record))
return Failure;
break;
case pch::SM_HEADER_FILE_INFO: {
HeaderFileInfo HFI;
HFI.isImport = Record[0];
HFI.DirInfo = Record[1];
HFI.NumIncludes = Record[2];
HFI.ControllingMacroID = Record[3];
if (Listener)
Listener->ReadHeaderFileInfo(HFI);
break;
}
case pch::SM_SLOC_FILE_ENTRY:
case pch::SM_SLOC_BUFFER_ENTRY:
case pch::SM_SLOC_INSTANTIATION_ENTRY:
// Once we hit one of the source location entries, we're done.
return Success;
}
}
}
/// \brief Read in the source location entry with the given ID.
PCHReader::PCHReadResult PCHReader::ReadSLocEntryRecord(unsigned ID) {
if (ID == 0)
return Success;
if (ID > TotalNumSLocEntries) {
Error("source location entry ID out-of-range for PCH file");
return Failure;
}
++NumSLocEntriesRead;
SLocEntryCursor.JumpToBit(SLocOffsets[ID - 1]);
unsigned Code = SLocEntryCursor.ReadCode();
if (Code == llvm::bitc::END_BLOCK ||
Code == llvm::bitc::ENTER_SUBBLOCK ||
Code == llvm::bitc::DEFINE_ABBREV) {
Error("incorrectly-formatted source location entry in PCH file");
return Failure;
}
RecordData Record;
const char *BlobStart;
unsigned BlobLen;
switch (SLocEntryCursor.ReadRecord(Code, Record, &BlobStart, &BlobLen)) {
default:
Error("incorrectly-formatted source location entry in PCH file");
return Failure;
case pch::SM_SLOC_FILE_ENTRY: {
std::string Filename(BlobStart, BlobStart + BlobLen);
MaybeAddSystemRootToFilename(Filename);
const FileEntry *File = FileMgr.getFile(Filename);
if (File == 0) {
std::string ErrorStr = "could not find file '";
ErrorStr += Filename;
ErrorStr += "' referenced by PCH file";
Error(ErrorStr.c_str());
return Failure;
}
FileID FID = SourceMgr.createFileID(File,
SourceLocation::getFromRawEncoding(Record[1]),
(SrcMgr::CharacteristicKind)Record[2],
ID, Record[0]);
if (Record[3])
const_cast<SrcMgr::FileInfo&>(SourceMgr.getSLocEntry(FID).getFile())
.setHasLineDirectives();
break;
}
case pch::SM_SLOC_BUFFER_ENTRY: {
const char *Name = BlobStart;
unsigned Offset = Record[0];
unsigned Code = SLocEntryCursor.ReadCode();
Record.clear();
unsigned RecCode
= SLocEntryCursor.ReadRecord(Code, Record, &BlobStart, &BlobLen);
assert(RecCode == pch::SM_SLOC_BUFFER_BLOB && "Ill-formed PCH file");
(void)RecCode;
llvm::MemoryBuffer *Buffer
= llvm::MemoryBuffer::getMemBuffer(BlobStart,
BlobStart + BlobLen - 1,
Name);
FileID BufferID = SourceMgr.createFileIDForMemBuffer(Buffer, ID, Offset);
if (strcmp(Name, "<built-in>") == 0) {
PCHPredefinesBufferID = BufferID;
PCHPredefines = BlobStart;
PCHPredefinesLen = BlobLen - 1;
}
break;
}
case pch::SM_SLOC_INSTANTIATION_ENTRY: {
SourceLocation SpellingLoc
= SourceLocation::getFromRawEncoding(Record[1]);
SourceMgr.createInstantiationLoc(SpellingLoc,
SourceLocation::getFromRawEncoding(Record[2]),
SourceLocation::getFromRawEncoding(Record[3]),
Record[4],
ID,
Record[0]);
break;
}
}
return Success;
}
/// ReadBlockAbbrevs - Enter a subblock of the specified BlockID with the
/// specified cursor. Read the abbreviations that are at the top of the block
/// and then leave the cursor pointing into the block.
bool PCHReader::ReadBlockAbbrevs(llvm::BitstreamCursor &Cursor,
unsigned BlockID) {
if (Cursor.EnterSubBlock(BlockID)) {
Error("malformed block record in PCH file");
return Failure;
}
while (true) {
unsigned Code = Cursor.ReadCode();
// We expect all abbrevs to be at the start of the block.
if (Code != llvm::bitc::DEFINE_ABBREV)
return false;
Cursor.ReadAbbrevRecord();
}
}
void PCHReader::ReadMacroRecord(uint64_t Offset) {
assert(PP && "Forgot to set Preprocessor ?");
// Keep track of where we are in the stream, then jump back there
// after reading this macro.
SavedStreamPosition SavedPosition(Stream);
Stream.JumpToBit(Offset);
RecordData Record;
llvm::SmallVector<IdentifierInfo*, 16> MacroArgs;
MacroInfo *Macro = 0;
while (true) {
unsigned Code = Stream.ReadCode();
switch (Code) {
case llvm::bitc::END_BLOCK:
return;
case llvm::bitc::ENTER_SUBBLOCK:
// No known subblocks, always skip them.
Stream.ReadSubBlockID();
if (Stream.SkipBlock()) {
Error("malformed block record in PCH file");
return;
}
continue;
case llvm::bitc::DEFINE_ABBREV:
Stream.ReadAbbrevRecord();
continue;
default: break;
}
// Read a record.
Record.clear();
pch::PreprocessorRecordTypes RecType =
(pch::PreprocessorRecordTypes)Stream.ReadRecord(Code, Record);
switch (RecType) {
case pch::PP_MACRO_OBJECT_LIKE:
case pch::PP_MACRO_FUNCTION_LIKE: {
// If we already have a macro, that means that we've hit the end
// of the definition of the macro we were looking for. We're
// done.
if (Macro)
return;
IdentifierInfo *II = DecodeIdentifierInfo(Record[0]);
if (II == 0) {
Error("macro must have a name in PCH file");
return;
}
SourceLocation Loc = SourceLocation::getFromRawEncoding(Record[1]);
bool isUsed = Record[2];
MacroInfo *MI = PP->AllocateMacroInfo(Loc);
MI->setIsUsed(isUsed);
if (RecType == pch::PP_MACRO_FUNCTION_LIKE) {
// Decode function-like macro info.
bool isC99VarArgs = Record[3];
bool isGNUVarArgs = Record[4];
MacroArgs.clear();
unsigned NumArgs = Record[5];
for (unsigned i = 0; i != NumArgs; ++i)
MacroArgs.push_back(DecodeIdentifierInfo(Record[6+i]));
// Install function-like macro info.
MI->setIsFunctionLike();
if (isC99VarArgs) MI->setIsC99Varargs();
if (isGNUVarArgs) MI->setIsGNUVarargs();
MI->setArgumentList(MacroArgs.data(), MacroArgs.size(),
PP->getPreprocessorAllocator());
}
// Finally, install the macro.
PP->setMacroInfo(II, MI);
// Remember that we saw this macro last so that we add the tokens that
// form its body to it.
Macro = MI;
++NumMacrosRead;
break;
}
case pch::PP_TOKEN: {
// If we see a TOKEN before a PP_MACRO_*, then the file is
// erroneous, just pretend we didn't see this.
if (Macro == 0) break;
Token Tok;
Tok.startToken();
Tok.setLocation(SourceLocation::getFromRawEncoding(Record[0]));
Tok.setLength(Record[1]);
if (IdentifierInfo *II = DecodeIdentifierInfo(Record[2]))
Tok.setIdentifierInfo(II);
Tok.setKind((tok::TokenKind)Record[3]);
Tok.setFlag((Token::TokenFlags)Record[4]);
Macro->AddTokenToBody(Tok);
break;
}
}
}
}
/// \brief If we are loading a relocatable PCH file, and the filename is
/// not an absolute path, add the system root to the beginning of the file
/// name.
void PCHReader::MaybeAddSystemRootToFilename(std::string &Filename) {
// If this is not a relocatable PCH file, there's nothing to do.
if (!RelocatablePCH)
return;
if (Filename.empty() || Filename[0] == '/' || Filename[0] == '<')
return;
std::string FIXME = Filename;
if (isysroot == 0) {
// If no system root was given, default to '/'
Filename.insert(Filename.begin(), '/');
return;
}
unsigned Length = strlen(isysroot);
if (isysroot[Length - 1] != '/')
Filename.insert(Filename.begin(), '/');
Filename.insert(Filename.begin(), isysroot, isysroot + Length);
}
PCHReader::PCHReadResult
PCHReader::ReadPCHBlock() {
if (Stream.EnterSubBlock(pch::PCH_BLOCK_ID)) {
Error("malformed block record in PCH file");
return Failure;
}
// Read all of the records and blocks for the PCH file.
RecordData Record;
while (!Stream.AtEndOfStream()) {
unsigned Code = Stream.ReadCode();
if (Code == llvm::bitc::END_BLOCK) {
if (Stream.ReadBlockEnd()) {
Error("error at end of module block in PCH file");
return Failure;
}
return Success;
}
if (Code == llvm::bitc::ENTER_SUBBLOCK) {
switch (Stream.ReadSubBlockID()) {
case pch::TYPES_BLOCK_ID: // Skip types block (lazily loaded)
default: // Skip unknown content.
if (Stream.SkipBlock()) {
Error("malformed block record in PCH file");
return Failure;
}
break;
case pch::DECLS_BLOCK_ID:
// We lazily load the decls block, but we want to set up the
// DeclsCursor cursor to point into it. Clone our current bitcode
// cursor to it, enter the block and read the abbrevs in that block.
// With the main cursor, we just skip over it.
DeclsCursor = Stream;
if (Stream.SkipBlock() || // Skip with the main cursor.
// Read the abbrevs.
ReadBlockAbbrevs(DeclsCursor, pch::DECLS_BLOCK_ID)) {
Error("malformed block record in PCH file");
return Failure;
}
break;
case pch::PREPROCESSOR_BLOCK_ID:
if (Stream.SkipBlock()) {
Error("malformed block record in PCH file");
return Failure;
}
break;
case pch::SOURCE_MANAGER_BLOCK_ID:
switch (ReadSourceManagerBlock()) {
case Success:
break;
case Failure:
Error("malformed source manager block in PCH file");
return Failure;
case IgnorePCH:
return IgnorePCH;
}
break;
}
continue;
}
if (Code == llvm::bitc::DEFINE_ABBREV) {
Stream.ReadAbbrevRecord();
continue;
}
// Read and process a record.
Record.clear();
const char *BlobStart = 0;
unsigned BlobLen = 0;
switch ((pch::PCHRecordTypes)Stream.ReadRecord(Code, Record,
&BlobStart, &BlobLen)) {
default: // Default behavior: ignore.
break;
case pch::TYPE_OFFSET:
if (!TypesLoaded.empty()) {
Error("duplicate TYPE_OFFSET record in PCH file");
return Failure;
}
TypeOffsets = (const uint32_t *)BlobStart;
TypesLoaded.resize(Record[0]);
break;
case pch::DECL_OFFSET:
if (!DeclsLoaded.empty()) {
Error("duplicate DECL_OFFSET record in PCH file");
return Failure;
}
DeclOffsets = (const uint32_t *)BlobStart;
DeclsLoaded.resize(Record[0]);
break;
case pch::LANGUAGE_OPTIONS:
if (ParseLanguageOptions(Record))
return IgnorePCH;
break;
case pch::METADATA: {
if (Record[0] != pch::VERSION_MAJOR) {
Diag(Record[0] < pch::VERSION_MAJOR? diag::warn_pch_version_too_old
: diag::warn_pch_version_too_new);
return IgnorePCH;
}
RelocatablePCH = Record[4];
if (Listener) {
std::string TargetTriple(BlobStart, BlobLen);
if (Listener->ReadTargetTriple(TargetTriple))
return IgnorePCH;
}
break;
}
case pch::IDENTIFIER_TABLE:
IdentifierTableData = BlobStart;
if (Record[0]) {
IdentifierLookupTable
= PCHIdentifierLookupTable::Create(
(const unsigned char *)IdentifierTableData + Record[0],
(const unsigned char *)IdentifierTableData,
PCHIdentifierLookupTrait(*this));
if (PP)
PP->getIdentifierTable().setExternalIdentifierLookup(this);
}
break;
case pch::IDENTIFIER_OFFSET:
if (!IdentifiersLoaded.empty()) {
Error("duplicate IDENTIFIER_OFFSET record in PCH file");
return Failure;
}
IdentifierOffsets = (const uint32_t *)BlobStart;
IdentifiersLoaded.resize(Record[0]);
if (PP)
PP->getHeaderSearchInfo().SetExternalLookup(this);
break;
case pch::EXTERNAL_DEFINITIONS:
if (!ExternalDefinitions.empty()) {
Error("duplicate EXTERNAL_DEFINITIONS record in PCH file");
return Failure;
}
ExternalDefinitions.swap(Record);
break;
case pch::SPECIAL_TYPES:
SpecialTypes.swap(Record);
break;
case pch::STATISTICS:
TotalNumStatements = Record[0];
TotalNumMacros = Record[1];
TotalLexicalDeclContexts = Record[2];
TotalVisibleDeclContexts = Record[3];
break;
case pch::TENTATIVE_DEFINITIONS:
if (!TentativeDefinitions.empty()) {
Error("duplicate TENTATIVE_DEFINITIONS record in PCH file");
return Failure;
}
TentativeDefinitions.swap(Record);
break;
case pch::LOCALLY_SCOPED_EXTERNAL_DECLS:
if (!LocallyScopedExternalDecls.empty()) {
Error("duplicate LOCALLY_SCOPED_EXTERNAL_DECLS record in PCH file");
return Failure;
}
LocallyScopedExternalDecls.swap(Record);
break;
case pch::SELECTOR_OFFSETS:
SelectorOffsets = (const uint32_t *)BlobStart;
TotalNumSelectors = Record[0];
SelectorsLoaded.resize(TotalNumSelectors);
break;
case pch::METHOD_POOL:
MethodPoolLookupTableData = (const unsigned char *)BlobStart;
if (Record[0])
MethodPoolLookupTable
= PCHMethodPoolLookupTable::Create(
MethodPoolLookupTableData + Record[0],
MethodPoolLookupTableData,
PCHMethodPoolLookupTrait(*this));
TotalSelectorsInMethodPool = Record[1];
break;
case pch::PP_COUNTER_VALUE:
if (!Record.empty() && Listener)
Listener->ReadCounter(Record[0]);
break;
case pch::SOURCE_LOCATION_OFFSETS:
SLocOffsets = (const uint32_t *)BlobStart;
TotalNumSLocEntries = Record[0];
SourceMgr.PreallocateSLocEntries(this,
TotalNumSLocEntries,
Record[1]);
break;
case pch::SOURCE_LOCATION_PRELOADS:
for (unsigned I = 0, N = Record.size(); I != N; ++I) {
PCHReadResult Result = ReadSLocEntryRecord(Record[I]);
if (Result != Success)
return Result;
}
break;
case pch::STAT_CACHE:
FileMgr.setStatCache(
new PCHStatCache((const unsigned char *)BlobStart + Record[0],
(const unsigned char *)BlobStart,
NumStatHits, NumStatMisses));
break;
case pch::EXT_VECTOR_DECLS:
if (!ExtVectorDecls.empty()) {
Error("duplicate EXT_VECTOR_DECLS record in PCH file");
return Failure;
}
ExtVectorDecls.swap(Record);
break;
case pch::OBJC_CATEGORY_IMPLEMENTATIONS:
if (!ObjCCategoryImpls.empty()) {
Error("duplicate OBJC_CATEGORY_IMPLEMENTATIONS record in PCH file");
return Failure;
}
ObjCCategoryImpls.swap(Record);
break;
case pch::ORIGINAL_FILE_NAME:
OriginalFileName.assign(BlobStart, BlobLen);
MaybeAddSystemRootToFilename(OriginalFileName);
break;
case pch::COMMENT_RANGES:
Comments = (SourceRange *)BlobStart;
NumComments = BlobLen / sizeof(SourceRange);
break;
}
}
Error("premature end of bitstream in PCH file");
return Failure;
}
PCHReader::PCHReadResult PCHReader::ReadPCH(const std::string &FileName) {
// Set the PCH file name.
this->FileName = FileName;
// Open the PCH file.
std::string ErrStr;
Buffer.reset(llvm::MemoryBuffer::getFile(FileName.c_str(), &ErrStr));
if (!Buffer) {
Error(ErrStr.c_str());
return IgnorePCH;
}
// Initialize the stream
StreamFile.init((const unsigned char *)Buffer->getBufferStart(),
(const unsigned char *)Buffer->getBufferEnd());
Stream.init(StreamFile);
// Sniff for the signature.
if (Stream.Read(8) != 'C' ||
Stream.Read(8) != 'P' ||
Stream.Read(8) != 'C' ||
Stream.Read(8) != 'H') {
Diag(diag::err_not_a_pch_file) << FileName;
return Failure;
}
while (!Stream.AtEndOfStream()) {
unsigned Code = Stream.ReadCode();
if (Code != llvm::bitc::ENTER_SUBBLOCK) {
Error("invalid record at top-level of PCH file");
return Failure;
}
unsigned BlockID = Stream.ReadSubBlockID();
// We only know the PCH subblock ID.
switch (BlockID) {
case llvm::bitc::BLOCKINFO_BLOCK_ID:
if (Stream.ReadBlockInfoBlock()) {
Error("malformed BlockInfoBlock in PCH file");
return Failure;
}
break;
case pch::PCH_BLOCK_ID:
switch (ReadPCHBlock()) {
case Success:
break;
case Failure:
return Failure;
case IgnorePCH:
// FIXME: We could consider reading through to the end of this
// PCH block, skipping subblocks, to see if there are other
// PCH blocks elsewhere.
// Clear out any preallocated source location entries, so that
// the source manager does not try to resolve them later.
SourceMgr.ClearPreallocatedSLocEntries();
// Remove the stat cache.
FileMgr.setStatCache(0);
return IgnorePCH;
}
break;
default:
if (Stream.SkipBlock()) {
Error("malformed block record in PCH file");
return Failure;
}
break;
}
}
// Check the predefines buffer.
if (CheckPredefinesBuffer(PCHPredefines, PCHPredefinesLen,
PCHPredefinesBufferID))
return IgnorePCH;
if (PP) {
// Initialization of builtins and library builtins occurs before the
// PCH file is read, so there may be some identifiers that were
// loaded into the IdentifierTable before we intercepted the
// creation of identifiers. Iterate through the list of known
// identifiers and determine whether we have to establish
// preprocessor definitions or top-level identifier declaration
// chains for those identifiers.
//
// We copy the IdentifierInfo pointers to a small vector first,
// since de-serializing declarations or macro definitions can add
// new entries into the identifier table, invalidating the
// iterators.
llvm::SmallVector<IdentifierInfo *, 128> Identifiers;
for (IdentifierTable::iterator Id = PP->getIdentifierTable().begin(),
IdEnd = PP->getIdentifierTable().end();
Id != IdEnd; ++Id)
Identifiers.push_back(Id->second);
PCHIdentifierLookupTable *IdTable
= (PCHIdentifierLookupTable *)IdentifierLookupTable;
for (unsigned I = 0, N = Identifiers.size(); I != N; ++I) {
IdentifierInfo *II = Identifiers[I];
// Look in the on-disk hash table for an entry for
PCHIdentifierLookupTrait Info(*this, II);
std::pair<const char*, unsigned> Key(II->getName(), II->getLength());
PCHIdentifierLookupTable::iterator Pos = IdTable->find(Key, &Info);
if (Pos == IdTable->end())
continue;
// Dereferencing the iterator has the effect of populating the
// IdentifierInfo node with the various declarations it needs.
(void)*Pos;
}
}
if (Context)
InitializeContext(*Context);
return Success;
}
void PCHReader::InitializeContext(ASTContext &Ctx) {
Context = &Ctx;
assert(Context && "Passed null context!");
assert(PP && "Forgot to set Preprocessor ?");
PP->getIdentifierTable().setExternalIdentifierLookup(this);
PP->getHeaderSearchInfo().SetExternalLookup(this);
// Load the translation unit declaration
ReadDeclRecord(DeclOffsets[0], 0);
// Load the special types.
Context->setBuiltinVaListType(
GetType(SpecialTypes[pch::SPECIAL_TYPE_BUILTIN_VA_LIST]));
if (unsigned Id = SpecialTypes[pch::SPECIAL_TYPE_OBJC_ID])
Context->setObjCIdType(GetType(Id));
if (unsigned Sel = SpecialTypes[pch::SPECIAL_TYPE_OBJC_SELECTOR])
Context->setObjCSelType(GetType(Sel));
if (unsigned Proto = SpecialTypes[pch::SPECIAL_TYPE_OBJC_PROTOCOL])
Context->setObjCProtoType(GetType(Proto));
if (unsigned Class = SpecialTypes[pch::SPECIAL_TYPE_OBJC_CLASS])
Context->setObjCClassType(GetType(Class));
if (unsigned String = SpecialTypes[pch::SPECIAL_TYPE_CF_CONSTANT_STRING])
Context->setCFConstantStringType(GetType(String));
if (unsigned FastEnum
= SpecialTypes[pch::SPECIAL_TYPE_OBJC_FAST_ENUMERATION_STATE])
Context->setObjCFastEnumerationStateType(GetType(FastEnum));
if (unsigned File = SpecialTypes[pch::SPECIAL_TYPE_FILE]) {
QualType FileType = GetType(File);
assert(!FileType.isNull() && "FILE type is NULL");
if (const TypedefType *Typedef = FileType->getAsTypedefType())
Context->setFILEDecl(Typedef->getDecl());
else {
const TagType *Tag = FileType->getAsTagType();
assert(Tag && "Invalid FILE type in PCH file");
Context->setFILEDecl(Tag->getDecl());
}
}
}
/// \brief Retrieve the name of the original source file name
/// directly from the PCH file, without actually loading the PCH
/// file.
std::string PCHReader::getOriginalSourceFile(const std::string &PCHFileName) {
// Open the PCH file.
std::string ErrStr;
llvm::OwningPtr<llvm::MemoryBuffer> Buffer;
Buffer.reset(llvm::MemoryBuffer::getFile(PCHFileName.c_str(), &ErrStr));
if (!Buffer) {
fprintf(stderr, "error: %s\n", ErrStr.c_str());
return std::string();
}
// Initialize the stream
llvm::BitstreamReader StreamFile;
llvm::BitstreamCursor Stream;
StreamFile.init((const unsigned char *)Buffer->getBufferStart(),
(const unsigned char *)Buffer->getBufferEnd());
Stream.init(StreamFile);
// Sniff for the signature.
if (Stream.Read(8) != 'C' ||
Stream.Read(8) != 'P' ||
Stream.Read(8) != 'C' ||
Stream.Read(8) != 'H') {
fprintf(stderr,
"error: '%s' does not appear to be a precompiled header file\n",
PCHFileName.c_str());
return std::string();
}
RecordData Record;
while (!Stream.AtEndOfStream()) {
unsigned Code = Stream.ReadCode();
if (Code == llvm::bitc::ENTER_SUBBLOCK) {
unsigned BlockID = Stream.ReadSubBlockID();
// We only know the PCH subblock ID.
switch (BlockID) {
case pch::PCH_BLOCK_ID:
if (Stream.EnterSubBlock(pch::PCH_BLOCK_ID)) {
fprintf(stderr, "error: malformed block record in PCH file\n");
return std::string();
}
break;
default:
if (Stream.SkipBlock()) {
fprintf(stderr, "error: malformed block record in PCH file\n");
return std::string();
}
break;
}
continue;
}
if (Code == llvm::bitc::END_BLOCK) {
if (Stream.ReadBlockEnd()) {
fprintf(stderr, "error: error at end of module block in PCH file\n");
return std::string();
}
continue;
}
if (Code == llvm::bitc::DEFINE_ABBREV) {
Stream.ReadAbbrevRecord();
continue;
}
Record.clear();
const char *BlobStart = 0;
unsigned BlobLen = 0;
if (Stream.ReadRecord(Code, Record, &BlobStart, &BlobLen)
== pch::ORIGINAL_FILE_NAME)
return std::string(BlobStart, BlobLen);
}
return std::string();
}
/// \brief Parse the record that corresponds to a LangOptions data
/// structure.
///
/// This routine compares the language options used to generate the
/// PCH file against the language options set for the current
/// compilation. For each option, we classify differences between the
/// two compiler states as either "benign" or "important". Benign
/// differences don't matter, and we accept them without complaint
/// (and without modifying the language options). Differences between
/// the states for important options cause the PCH file to be
/// unusable, so we emit a warning and return true to indicate that
/// there was an error.
///
/// \returns true if the PCH file is unacceptable, false otherwise.
bool PCHReader::ParseLanguageOptions(
const llvm::SmallVectorImpl<uint64_t> &Record) {
if (Listener) {
LangOptions LangOpts;
#define PARSE_LANGOPT(Option) \
LangOpts.Option = Record[Idx]; \
++Idx
unsigned Idx = 0;
PARSE_LANGOPT(Trigraphs);
PARSE_LANGOPT(BCPLComment);
PARSE_LANGOPT(DollarIdents);
PARSE_LANGOPT(AsmPreprocessor);
PARSE_LANGOPT(GNUMode);
PARSE_LANGOPT(ImplicitInt);
PARSE_LANGOPT(Digraphs);
PARSE_LANGOPT(HexFloats);
PARSE_LANGOPT(C99);
PARSE_LANGOPT(Microsoft);
PARSE_LANGOPT(CPlusPlus);
PARSE_LANGOPT(CPlusPlus0x);
PARSE_LANGOPT(CXXOperatorNames);
PARSE_LANGOPT(ObjC1);
PARSE_LANGOPT(ObjC2);
PARSE_LANGOPT(ObjCNonFragileABI);
PARSE_LANGOPT(PascalStrings);
PARSE_LANGOPT(WritableStrings);
PARSE_LANGOPT(LaxVectorConversions);
PARSE_LANGOPT(AltiVec);
PARSE_LANGOPT(Exceptions);
PARSE_LANGOPT(NeXTRuntime);
PARSE_LANGOPT(Freestanding);
PARSE_LANGOPT(NoBuiltin);
PARSE_LANGOPT(ThreadsafeStatics);
PARSE_LANGOPT(Blocks);
PARSE_LANGOPT(EmitAllDecls);
PARSE_LANGOPT(MathErrno);
PARSE_LANGOPT(OverflowChecking);
PARSE_LANGOPT(HeinousExtensions);
PARSE_LANGOPT(Optimize);
PARSE_LANGOPT(OptimizeSize);
PARSE_LANGOPT(Static);
PARSE_LANGOPT(PICLevel);
PARSE_LANGOPT(GNUInline);
PARSE_LANGOPT(NoInline);
PARSE_LANGOPT(AccessControl);
PARSE_LANGOPT(CharIsSigned);
LangOpts.setGCMode((LangOptions::GCMode)Record[Idx]);
++Idx;
LangOpts.setVisibilityMode((LangOptions::VisibilityMode)Record[Idx]);
++Idx;
PARSE_LANGOPT(InstantiationDepth);
PARSE_LANGOPT(OpenCL);
#undef PARSE_LANGOPT
return Listener->ReadLanguageOptions(LangOpts);
}
return false;
}
void PCHReader::ReadComments(std::vector<SourceRange> &Comments) {
Comments.resize(NumComments);
std::copy(this->Comments, this->Comments + NumComments,
Comments.begin());
}
/// \brief Read and return the type at the given offset.
///
/// This routine actually reads the record corresponding to the type
/// at the given offset in the bitstream. It is a helper routine for
/// GetType, which deals with reading type IDs.
QualType PCHReader::ReadTypeRecord(uint64_t Offset) {
// Keep track of where we are in the stream, then jump back there
// after reading this type.
SavedStreamPosition SavedPosition(Stream);
// Note that we are loading a type record.
LoadingTypeOrDecl Loading(*this);
Stream.JumpToBit(Offset);
RecordData Record;
unsigned Code = Stream.ReadCode();
switch ((pch::TypeCode)Stream.ReadRecord(Code, Record)) {
case pch::TYPE_EXT_QUAL: {
assert(Record.size() == 3 &&
"Incorrect encoding of extended qualifier type");
QualType Base = GetType(Record[0]);
QualType::GCAttrTypes GCAttr = (QualType::GCAttrTypes)Record[1];
unsigned AddressSpace = Record[2];
QualType T = Base;
if (GCAttr != QualType::GCNone)
T = Context->getObjCGCQualType(T, GCAttr);
if (AddressSpace)
T = Context->getAddrSpaceQualType(T, AddressSpace);
return T;
}
case pch::TYPE_FIXED_WIDTH_INT: {
assert(Record.size() == 2 && "Incorrect encoding of fixed-width int type");
return Context->getFixedWidthIntType(Record[0], Record[1]);
}
case pch::TYPE_COMPLEX: {
assert(Record.size() == 1 && "Incorrect encoding of complex type");
QualType ElemType = GetType(Record[0]);
return Context->getComplexType(ElemType);
}
case pch::TYPE_POINTER: {
assert(Record.size() == 1 && "Incorrect encoding of pointer type");
QualType PointeeType = GetType(Record[0]);
return Context->getPointerType(PointeeType);
}
case pch::TYPE_BLOCK_POINTER: {
assert(Record.size() == 1 && "Incorrect encoding of block pointer type");
QualType PointeeType = GetType(Record[0]);
return Context->getBlockPointerType(PointeeType);
}
case pch::TYPE_LVALUE_REFERENCE: {
assert(Record.size() == 1 && "Incorrect encoding of lvalue reference type");
QualType PointeeType = GetType(Record[0]);
return Context->getLValueReferenceType(PointeeType);
}
case pch::TYPE_RVALUE_REFERENCE: {
assert(Record.size() == 1 && "Incorrect encoding of rvalue reference type");
QualType PointeeType = GetType(Record[0]);
return Context->getRValueReferenceType(PointeeType);
}
case pch::TYPE_MEMBER_POINTER: {
assert(Record.size() == 1 && "Incorrect encoding of member pointer type");
QualType PointeeType = GetType(Record[0]);
QualType ClassType = GetType(Record[1]);
return Context->getMemberPointerType(PointeeType, ClassType.getTypePtr());
}
case pch::TYPE_CONSTANT_ARRAY: {
QualType ElementType = GetType(Record[0]);
ArrayType::ArraySizeModifier ASM = (ArrayType::ArraySizeModifier)Record[1];
unsigned IndexTypeQuals = Record[2];
unsigned Idx = 3;
llvm::APInt Size = ReadAPInt(Record, Idx);
return Context->getConstantArrayType(ElementType, Size,
ASM, IndexTypeQuals);
}
case pch::TYPE_CONSTANT_ARRAY_WITH_EXPR: {
QualType ElementType = GetType(Record[0]);
ArrayType::ArraySizeModifier ASM = (ArrayType::ArraySizeModifier)Record[1];
unsigned IndexTypeQuals = Record[2];
SourceLocation LBLoc = SourceLocation::getFromRawEncoding(Record[3]);
SourceLocation RBLoc = SourceLocation::getFromRawEncoding(Record[4]);
unsigned Idx = 5;
llvm::APInt Size = ReadAPInt(Record, Idx);
return Context->getConstantArrayWithExprType(ElementType,
Size, ReadTypeExpr(),
ASM, IndexTypeQuals,
SourceRange(LBLoc, RBLoc));
}
case pch::TYPE_CONSTANT_ARRAY_WITHOUT_EXPR: {
QualType ElementType = GetType(Record[0]);
ArrayType::ArraySizeModifier ASM = (ArrayType::ArraySizeModifier)Record[1];
unsigned IndexTypeQuals = Record[2];
unsigned Idx = 3;
llvm::APInt Size = ReadAPInt(Record, Idx);
return Context->getConstantArrayWithoutExprType(ElementType, Size,
ASM, IndexTypeQuals);
}
case pch::TYPE_INCOMPLETE_ARRAY: {
QualType ElementType = GetType(Record[0]);
ArrayType::ArraySizeModifier ASM = (ArrayType::ArraySizeModifier)Record[1];
unsigned IndexTypeQuals = Record[2];
return Context->getIncompleteArrayType(ElementType, ASM, IndexTypeQuals);
}
case pch::TYPE_VARIABLE_ARRAY: {
QualType ElementType = GetType(Record[0]);
ArrayType::ArraySizeModifier ASM = (ArrayType::ArraySizeModifier)Record[1];
unsigned IndexTypeQuals = Record[2];
SourceLocation LBLoc = SourceLocation::getFromRawEncoding(Record[3]);
SourceLocation RBLoc = SourceLocation::getFromRawEncoding(Record[4]);
return Context->getVariableArrayType(ElementType, ReadTypeExpr(),
ASM, IndexTypeQuals,
SourceRange(LBLoc, RBLoc));
}
case pch::TYPE_VECTOR: {
if (Record.size() != 2) {
Error("incorrect encoding of vector type in PCH file");
return QualType();
}
QualType ElementType = GetType(Record[0]);
unsigned NumElements = Record[1];
return Context->getVectorType(ElementType, NumElements);
}
case pch::TYPE_EXT_VECTOR: {
if (Record.size() != 2) {
Error("incorrect encoding of extended vector type in PCH file");
return QualType();
}
QualType ElementType = GetType(Record[0]);
unsigned NumElements = Record[1];
return Context->getExtVectorType(ElementType, NumElements);
}
case pch::TYPE_FUNCTION_NO_PROTO: {
if (Record.size() != 1) {
Error("incorrect encoding of no-proto function type");
return QualType();
}
QualType ResultType = GetType(Record[0]);
return Context->getFunctionNoProtoType(ResultType);
}
case pch::TYPE_FUNCTION_PROTO: {
QualType ResultType = GetType(Record[0]);
unsigned Idx = 1;
unsigned NumParams = Record[Idx++];
llvm::SmallVector<QualType, 16> ParamTypes;
for (unsigned I = 0; I != NumParams; ++I)
ParamTypes.push_back(GetType(Record[Idx++]));
bool isVariadic = Record[Idx++];
unsigned Quals = Record[Idx++];
bool hasExceptionSpec = Record[Idx++];
bool hasAnyExceptionSpec = Record[Idx++];
unsigned NumExceptions = Record[Idx++];
llvm::SmallVector<QualType, 2> Exceptions;
for (unsigned I = 0; I != NumExceptions; ++I)
Exceptions.push_back(GetType(Record[Idx++]));
return Context->getFunctionType(ResultType, ParamTypes.data(), NumParams,
isVariadic, Quals, hasExceptionSpec,
hasAnyExceptionSpec, NumExceptions,
Exceptions.data());
}
case pch::TYPE_TYPEDEF:
assert(Record.size() == 1 && "incorrect encoding of typedef type");
return Context->getTypeDeclType(cast<TypedefDecl>(GetDecl(Record[0])));
case pch::TYPE_TYPEOF_EXPR:
return Context->getTypeOfExprType(ReadTypeExpr());
case pch::TYPE_TYPEOF: {
if (Record.size() != 1) {
Error("incorrect encoding of typeof(type) in PCH file");
return QualType();
}
QualType UnderlyingType = GetType(Record[0]);
return Context->getTypeOfType(UnderlyingType);
}
case pch::TYPE_DECLTYPE:
return Context->getDecltypeType(ReadTypeExpr());
case pch::TYPE_RECORD:
assert(Record.size() == 1 && "incorrect encoding of record type");
return Context->getTypeDeclType(cast<RecordDecl>(GetDecl(Record[0])));
case pch::TYPE_ENUM:
assert(Record.size() == 1 && "incorrect encoding of enum type");
return Context->getTypeDeclType(cast<EnumDecl>(GetDecl(Record[0])));
case pch::TYPE_OBJC_INTERFACE:
assert(Record.size() == 1 && "incorrect encoding of objc interface type");
return Context->getObjCInterfaceType(
cast<ObjCInterfaceDecl>(GetDecl(Record[0])));
case pch::TYPE_OBJC_QUALIFIED_INTERFACE: {
unsigned Idx = 0;
ObjCInterfaceDecl *ItfD = cast<ObjCInterfaceDecl>(GetDecl(Record[Idx++]));
unsigned NumProtos = Record[Idx++];
llvm::SmallVector<ObjCProtocolDecl*, 4> Protos;
for (unsigned I = 0; I != NumProtos; ++I)
Protos.push_back(cast<ObjCProtocolDecl>(GetDecl(Record[Idx++])));
return Context->getObjCQualifiedInterfaceType(ItfD, Protos.data(), NumProtos);
}
case pch::TYPE_OBJC_OBJECT_POINTER: {
unsigned Idx = 0;
QualType OIT = GetType(Record[Idx++]);
unsigned NumProtos = Record[Idx++];
llvm::SmallVector<ObjCProtocolDecl*, 4> Protos;
for (unsigned I = 0; I != NumProtos; ++I)
Protos.push_back(cast<ObjCProtocolDecl>(GetDecl(Record[Idx++])));
return Context->getObjCObjectPointerType(OIT, Protos.data(), NumProtos);
}
}
// Suppress a GCC warning
return QualType();
}
QualType PCHReader::GetType(pch::TypeID ID) {
unsigned Quals = ID & 0x07;
unsigned Index = ID >> 3;
if (Index < pch::NUM_PREDEF_TYPE_IDS) {
QualType T;
switch ((pch::PredefinedTypeIDs)Index) {
case pch::PREDEF_TYPE_NULL_ID: return QualType();
case pch::PREDEF_TYPE_VOID_ID: T = Context->VoidTy; break;
case pch::PREDEF_TYPE_BOOL_ID: T = Context->BoolTy; break;
case pch::PREDEF_TYPE_CHAR_U_ID:
case pch::PREDEF_TYPE_CHAR_S_ID:
// FIXME: Check that the signedness of CharTy is correct!
T = Context->CharTy;
break;
case pch::PREDEF_TYPE_UCHAR_ID: T = Context->UnsignedCharTy; break;
case pch::PREDEF_TYPE_USHORT_ID: T = Context->UnsignedShortTy; break;
case pch::PREDEF_TYPE_UINT_ID: T = Context->UnsignedIntTy; break;
case pch::PREDEF_TYPE_ULONG_ID: T = Context->UnsignedLongTy; break;
case pch::PREDEF_TYPE_ULONGLONG_ID: T = Context->UnsignedLongLongTy; break;
case pch::PREDEF_TYPE_UINT128_ID: T = Context->UnsignedInt128Ty; break;
case pch::PREDEF_TYPE_SCHAR_ID: T = Context->SignedCharTy; break;
case pch::PREDEF_TYPE_WCHAR_ID: T = Context->WCharTy; break;
case pch::PREDEF_TYPE_SHORT_ID: T = Context->ShortTy; break;
case pch::PREDEF_TYPE_INT_ID: T = Context->IntTy; break;
case pch::PREDEF_TYPE_LONG_ID: T = Context->LongTy; break;
case pch::PREDEF_TYPE_LONGLONG_ID: T = Context->LongLongTy; break;
case pch::PREDEF_TYPE_INT128_ID: T = Context->Int128Ty; break;
case pch::PREDEF_TYPE_FLOAT_ID: T = Context->FloatTy; break;
case pch::PREDEF_TYPE_DOUBLE_ID: T = Context->DoubleTy; break;
case pch::PREDEF_TYPE_LONGDOUBLE_ID: T = Context->LongDoubleTy; break;
case pch::PREDEF_TYPE_OVERLOAD_ID: T = Context->OverloadTy; break;
case pch::PREDEF_TYPE_DEPENDENT_ID: T = Context->DependentTy; break;
case pch::PREDEF_TYPE_NULLPTR_ID: T = Context->NullPtrTy; break;
case pch::PREDEF_TYPE_CHAR16_ID: T = Context->Char16Ty; break;
case pch::PREDEF_TYPE_CHAR32_ID: T = Context->Char32Ty; break;
}
assert(!T.isNull() && "Unknown predefined type");
return T.getQualifiedType(Quals);
}
Index -= pch::NUM_PREDEF_TYPE_IDS;
assert(Index < TypesLoaded.size() && "Type index out-of-range");
if (!TypesLoaded[Index])
TypesLoaded[Index] = ReadTypeRecord(TypeOffsets[Index]).getTypePtr();
return QualType(TypesLoaded[Index], Quals);
}
Decl *PCHReader::GetDecl(pch::DeclID ID) {
if (ID == 0)
return 0;
if (ID > DeclsLoaded.size()) {
Error("declaration ID out-of-range for PCH file");
return 0;
}
unsigned Index = ID - 1;
if (!DeclsLoaded[Index])
ReadDeclRecord(DeclOffsets[Index], Index);
return DeclsLoaded[Index];
}
/// \brief Resolve the offset of a statement into a statement.
///
/// This operation will read a new statement from the external
/// source each time it is called, and is meant to be used via a
/// LazyOffsetPtr (which is used by Decls for the body of functions, etc).
Stmt *PCHReader::GetDeclStmt(uint64_t Offset) {
// Since we know tha this statement is part of a decl, make sure to use the
// decl cursor to read it.
DeclsCursor.JumpToBit(Offset);
return ReadStmt(DeclsCursor);
}
bool PCHReader::ReadDeclsLexicallyInContext(DeclContext *DC,
llvm::SmallVectorImpl<pch::DeclID> &Decls) {
assert(DC->hasExternalLexicalStorage() &&
"DeclContext has no lexical decls in storage");
uint64_t Offset = DeclContextOffsets[DC].first;
assert(Offset && "DeclContext has no lexical decls in storage");
// Keep track of where we are in the stream, then jump back there
// after reading this context.
SavedStreamPosition SavedPosition(DeclsCursor);
// Load the record containing all of the declarations lexically in
// this context.
DeclsCursor.JumpToBit(Offset);
RecordData Record;
unsigned Code = DeclsCursor.ReadCode();
unsigned RecCode = DeclsCursor.ReadRecord(Code, Record);
(void)RecCode;
assert(RecCode == pch::DECL_CONTEXT_LEXICAL && "Expected lexical block");
// Load all of the declaration IDs
Decls.clear();
Decls.insert(Decls.end(), Record.begin(), Record.end());
++NumLexicalDeclContextsRead;
return false;
}
bool PCHReader::ReadDeclsVisibleInContext(DeclContext *DC,
llvm::SmallVectorImpl<VisibleDeclaration> &Decls) {
assert(DC->hasExternalVisibleStorage() &&
"DeclContext has no visible decls in storage");
uint64_t Offset = DeclContextOffsets[DC].second;
assert(Offset && "DeclContext has no visible decls in storage");
// Keep track of where we are in the stream, then jump back there
// after reading this context.
SavedStreamPosition SavedPosition(DeclsCursor);
// Load the record containing all of the declarations visible in
// this context.
DeclsCursor.JumpToBit(Offset);
RecordData Record;
unsigned Code = DeclsCursor.ReadCode();
unsigned RecCode = DeclsCursor.ReadRecord(Code, Record);
(void)RecCode;
assert(RecCode == pch::DECL_CONTEXT_VISIBLE && "Expected visible block");
if (Record.size() == 0)
return false;
Decls.clear();
unsigned Idx = 0;
while (Idx < Record.size()) {
Decls.push_back(VisibleDeclaration());
Decls.back().Name = ReadDeclarationName(Record, Idx);
unsigned Size = Record[Idx++];
llvm::SmallVector<unsigned, 4> &LoadedDecls = Decls.back().Declarations;
LoadedDecls.reserve(Size);
for (unsigned I = 0; I < Size; ++I)
LoadedDecls.push_back(Record[Idx++]);
}
++NumVisibleDeclContextsRead;
return false;
}
void PCHReader::StartTranslationUnit(ASTConsumer *Consumer) {
this->Consumer = Consumer;
if (!Consumer)
return;
for (unsigned I = 0, N = ExternalDefinitions.size(); I != N; ++I) {
Decl *D = GetDecl(ExternalDefinitions[I]);
DeclGroupRef DG(D);
Consumer->HandleTopLevelDecl(DG);
}
for (unsigned I = 0, N = InterestingDecls.size(); I != N; ++I) {
DeclGroupRef DG(InterestingDecls[I]);
Consumer->HandleTopLevelDecl(DG);
}
}
void PCHReader::PrintStats() {
std::fprintf(stderr, "*** PCH Statistics:\n");
unsigned NumTypesLoaded
= TypesLoaded.size() - std::count(TypesLoaded.begin(), TypesLoaded.end(),
(Type *)0);
unsigned NumDeclsLoaded
= DeclsLoaded.size() - std::count(DeclsLoaded.begin(), DeclsLoaded.end(),
(Decl *)0);
unsigned NumIdentifiersLoaded
= IdentifiersLoaded.size() - std::count(IdentifiersLoaded.begin(),
IdentifiersLoaded.end(),
(IdentifierInfo *)0);
unsigned NumSelectorsLoaded
= SelectorsLoaded.size() - std::count(SelectorsLoaded.begin(),
SelectorsLoaded.end(),
Selector());
std::fprintf(stderr, " %u stat cache hits\n", NumStatHits);
std::fprintf(stderr, " %u stat cache misses\n", NumStatMisses);
if (TotalNumSLocEntries)
std::fprintf(stderr, " %u/%u source location entries read (%f%%)\n",
NumSLocEntriesRead, TotalNumSLocEntries,
((float)NumSLocEntriesRead/TotalNumSLocEntries * 100));
if (!TypesLoaded.empty())
std::fprintf(stderr, " %u/%u types read (%f%%)\n",
NumTypesLoaded, (unsigned)TypesLoaded.size(),
((float)NumTypesLoaded/TypesLoaded.size() * 100));
if (!DeclsLoaded.empty())
std::fprintf(stderr, " %u/%u declarations read (%f%%)\n",
NumDeclsLoaded, (unsigned)DeclsLoaded.size(),
((float)NumDeclsLoaded/DeclsLoaded.size() * 100));
if (!IdentifiersLoaded.empty())
std::fprintf(stderr, " %u/%u identifiers read (%f%%)\n",
NumIdentifiersLoaded, (unsigned)IdentifiersLoaded.size(),
((float)NumIdentifiersLoaded/IdentifiersLoaded.size() * 100));
if (TotalNumSelectors)
std::fprintf(stderr, " %u/%u selectors read (%f%%)\n",
NumSelectorsLoaded, TotalNumSelectors,
((float)NumSelectorsLoaded/TotalNumSelectors * 100));
if (TotalNumStatements)
std::fprintf(stderr, " %u/%u statements read (%f%%)\n",
NumStatementsRead, TotalNumStatements,
((float)NumStatementsRead/TotalNumStatements * 100));
if (TotalNumMacros)
std::fprintf(stderr, " %u/%u macros read (%f%%)\n",
NumMacrosRead, TotalNumMacros,
((float)NumMacrosRead/TotalNumMacros * 100));
if (TotalLexicalDeclContexts)
std::fprintf(stderr, " %u/%u lexical declcontexts read (%f%%)\n",
NumLexicalDeclContextsRead, TotalLexicalDeclContexts,
((float)NumLexicalDeclContextsRead/TotalLexicalDeclContexts
* 100));
if (TotalVisibleDeclContexts)
std::fprintf(stderr, " %u/%u visible declcontexts read (%f%%)\n",
NumVisibleDeclContextsRead, TotalVisibleDeclContexts,
((float)NumVisibleDeclContextsRead/TotalVisibleDeclContexts
* 100));
if (TotalSelectorsInMethodPool) {
std::fprintf(stderr, " %u/%u method pool entries read (%f%%)\n",
NumMethodPoolSelectorsRead, TotalSelectorsInMethodPool,
((float)NumMethodPoolSelectorsRead/TotalSelectorsInMethodPool
* 100));
std::fprintf(stderr, " %u method pool misses\n", NumMethodPoolMisses);
}
std::fprintf(stderr, "\n");
}
void PCHReader::InitializeSema(Sema &S) {
SemaObj = &S;
S.ExternalSource = this;
// Makes sure any declarations that were deserialized "too early"
// still get added to the identifier's declaration chains.
for (unsigned I = 0, N = PreloadedDecls.size(); I != N; ++I) {
SemaObj->TUScope->AddDecl(Action::DeclPtrTy::make(PreloadedDecls[I]));
SemaObj->IdResolver.AddDecl(PreloadedDecls[I]);
}
PreloadedDecls.clear();
// If there were any tentative definitions, deserialize them and add
// them to Sema's table of tentative definitions.
for (unsigned I = 0, N = TentativeDefinitions.size(); I != N; ++I) {
VarDecl *Var = cast<VarDecl>(GetDecl(TentativeDefinitions[I]));
SemaObj->TentativeDefinitions[Var->getDeclName()] = Var;
}
// If there were any locally-scoped external declarations,
// deserialize them and add them to Sema's table of locally-scoped
// external declarations.
for (unsigned I = 0, N = LocallyScopedExternalDecls.size(); I != N; ++I) {
NamedDecl *D = cast<NamedDecl>(GetDecl(LocallyScopedExternalDecls[I]));
SemaObj->LocallyScopedExternalDecls[D->getDeclName()] = D;
}
// If there were any ext_vector type declarations, deserialize them
// and add them to Sema's vector of such declarations.
for (unsigned I = 0, N = ExtVectorDecls.size(); I != N; ++I)
SemaObj->ExtVectorDecls.push_back(
cast<TypedefDecl>(GetDecl(ExtVectorDecls[I])));
// If there were any Objective-C category implementations,
// deserialize them and add them to Sema's vector of such
// definitions.
for (unsigned I = 0, N = ObjCCategoryImpls.size(); I != N; ++I)
SemaObj->ObjCCategoryImpls.push_back(
cast<ObjCCategoryImplDecl>(GetDecl(ObjCCategoryImpls[I])));
}
IdentifierInfo* PCHReader::get(const char *NameStart, const char *NameEnd) {
// Try to find this name within our on-disk hash table
PCHIdentifierLookupTable *IdTable
= (PCHIdentifierLookupTable *)IdentifierLookupTable;
std::pair<const char*, unsigned> Key(NameStart, NameEnd - NameStart);
PCHIdentifierLookupTable::iterator Pos = IdTable->find(Key);
if (Pos == IdTable->end())
return 0;
// Dereferencing the iterator has the effect of building the
// IdentifierInfo node and populating it with the various
// declarations it needs.
return *Pos;
}
std::pair<ObjCMethodList, ObjCMethodList>
PCHReader::ReadMethodPool(Selector Sel) {
if (!MethodPoolLookupTable)
return std::pair<ObjCMethodList, ObjCMethodList>();
// Try to find this selector within our on-disk hash table.
PCHMethodPoolLookupTable *PoolTable
= (PCHMethodPoolLookupTable*)MethodPoolLookupTable;
PCHMethodPoolLookupTable::iterator Pos = PoolTable->find(Sel);
if (Pos == PoolTable->end()) {
++NumMethodPoolMisses;
return std::pair<ObjCMethodList, ObjCMethodList>();;
}
++NumMethodPoolSelectorsRead;
return *Pos;
}
void PCHReader::SetIdentifierInfo(unsigned ID, IdentifierInfo *II) {
assert(ID && "Non-zero identifier ID required");
assert(ID <= IdentifiersLoaded.size() && "identifier ID out of range");
IdentifiersLoaded[ID - 1] = II;
}
/// \brief Set the globally-visible declarations associated with the given
/// identifier.
///
/// If the PCH reader is currently in a state where the given declaration IDs
/// cannot safely be resolved, they are queued until it is safe to resolve
/// them.
///
/// \param II an IdentifierInfo that refers to one or more globally-visible
/// declarations.
///
/// \param DeclIDs the set of declaration IDs with the name @p II that are
/// visible at global scope.
///
/// \param Nonrecursive should be true to indicate that the caller knows that
/// this call is non-recursive, and therefore the globally-visible declarations
/// will not be placed onto the pending queue.
void
PCHReader::SetGloballyVisibleDecls(IdentifierInfo *II,
const llvm::SmallVectorImpl<uint32_t> &DeclIDs,
bool Nonrecursive) {
if (CurrentlyLoadingTypeOrDecl && !Nonrecursive) {
PendingIdentifierInfos.push_back(PendingIdentifierInfo());
PendingIdentifierInfo &PII = PendingIdentifierInfos.back();
PII.II = II;
for (unsigned I = 0, N = DeclIDs.size(); I != N; ++I)
PII.DeclIDs.push_back(DeclIDs[I]);
return;
}
for (unsigned I = 0, N = DeclIDs.size(); I != N; ++I) {
NamedDecl *D = cast<NamedDecl>(GetDecl(DeclIDs[I]));
if (SemaObj) {
// Introduce this declaration into the translation-unit scope
// and add it to the declaration chain for this identifier, so
// that (unqualified) name lookup will find it.
SemaObj->TUScope->AddDecl(Action::DeclPtrTy::make(D));
SemaObj->IdResolver.AddDeclToIdentifierChain(II, D);
} else {
// Queue this declaration so that it will be added to the
// translation unit scope and identifier's declaration chain
// once a Sema object is known.
PreloadedDecls.push_back(D);
}
}
}
IdentifierInfo *PCHReader::DecodeIdentifierInfo(unsigned ID) {
if (ID == 0)
return 0;
if (!IdentifierTableData || IdentifiersLoaded.empty()) {
Error("no identifier table in PCH file");
return 0;
}
assert(PP && "Forgot to set Preprocessor ?");
if (!IdentifiersLoaded[ID - 1]) {
uint32_t Offset = IdentifierOffsets[ID - 1];
const char *Str = IdentifierTableData + Offset;
// All of the strings in the PCH file are preceded by a 16-bit
// length. Extract that 16-bit length to avoid having to execute
// strlen().
const char *StrLenPtr = Str - 2;
unsigned StrLen = (((unsigned) StrLenPtr[0])
| (((unsigned) StrLenPtr[1]) << 8)) - 1;
IdentifiersLoaded[ID - 1]
= &PP->getIdentifierTable().get(Str, Str + StrLen);
}
return IdentifiersLoaded[ID - 1];
}
void PCHReader::ReadSLocEntry(unsigned ID) {
ReadSLocEntryRecord(ID);
}
Selector PCHReader::DecodeSelector(unsigned ID) {
if (ID == 0)
return Selector();
if (!MethodPoolLookupTableData)
return Selector();
if (ID > TotalNumSelectors) {
Error("selector ID out of range in PCH file");
return Selector();
}
unsigned Index = ID - 1;
if (SelectorsLoaded[Index].getAsOpaquePtr() == 0) {
// Load this selector from the selector table.
// FIXME: endianness portability issues with SelectorOffsets table
PCHMethodPoolLookupTrait Trait(*this);
SelectorsLoaded[Index]
= Trait.ReadKey(MethodPoolLookupTableData + SelectorOffsets[Index], 0);
}
return SelectorsLoaded[Index];
}
DeclarationName
PCHReader::ReadDeclarationName(const RecordData &Record, unsigned &Idx) {
DeclarationName::NameKind Kind = (DeclarationName::NameKind)Record[Idx++];
switch (Kind) {
case DeclarationName::Identifier:
return DeclarationName(GetIdentifierInfo(Record, Idx));
case DeclarationName::ObjCZeroArgSelector:
case DeclarationName::ObjCOneArgSelector:
case DeclarationName::ObjCMultiArgSelector:
return DeclarationName(GetSelector(Record, Idx));
case DeclarationName::CXXConstructorName:
return Context->DeclarationNames.getCXXConstructorName(
GetType(Record[Idx++]));
case DeclarationName::CXXDestructorName:
return Context->DeclarationNames.getCXXDestructorName(
GetType(Record[Idx++]));
case DeclarationName::CXXConversionFunctionName:
return Context->DeclarationNames.getCXXConversionFunctionName(
GetType(Record[Idx++]));
case DeclarationName::CXXOperatorName:
return Context->DeclarationNames.getCXXOperatorName(
(OverloadedOperatorKind)Record[Idx++]);
case DeclarationName::CXXUsingDirective:
return DeclarationName::getUsingDirectiveName();
}
// Required to silence GCC warning
return DeclarationName();
}
/// \brief Read an integral value
llvm::APInt PCHReader::ReadAPInt(const RecordData &Record, unsigned &Idx) {
unsigned BitWidth = Record[Idx++];
unsigned NumWords = llvm::APInt::getNumWords(BitWidth);
llvm::APInt Result(BitWidth, NumWords, &Record[Idx]);
Idx += NumWords;
return Result;
}
/// \brief Read a signed integral value
llvm::APSInt PCHReader::ReadAPSInt(const RecordData &Record, unsigned &Idx) {
bool isUnsigned = Record[Idx++];
return llvm::APSInt(ReadAPInt(Record, Idx), isUnsigned);
}
/// \brief Read a floating-point value
llvm::APFloat PCHReader::ReadAPFloat(const RecordData &Record, unsigned &Idx) {
return llvm::APFloat(ReadAPInt(Record, Idx));
}
// \brief Read a string
std::string PCHReader::ReadString(const RecordData &Record, unsigned &Idx) {
unsigned Len = Record[Idx++];
std::string Result(Record.data() + Idx, Record.data() + Idx + Len);
Idx += Len;
return Result;
}
DiagnosticBuilder PCHReader::Diag(unsigned DiagID) {
return Diag(SourceLocation(), DiagID);
}
DiagnosticBuilder PCHReader::Diag(SourceLocation Loc, unsigned DiagID) {
return Diags.Report(FullSourceLoc(Loc, SourceMgr), DiagID);
}
/// \brief Retrieve the identifier table associated with the
/// preprocessor.
IdentifierTable &PCHReader::getIdentifierTable() {
assert(PP && "Forgot to set Preprocessor ?");
return PP->getIdentifierTable();
}
/// \brief Record that the given ID maps to the given switch-case
/// statement.
void PCHReader::RecordSwitchCaseID(SwitchCase *SC, unsigned ID) {
assert(SwitchCaseStmts[ID] == 0 && "Already have a SwitchCase with this ID");
SwitchCaseStmts[ID] = SC;
}
/// \brief Retrieve the switch-case statement with the given ID.
SwitchCase *PCHReader::getSwitchCaseWithID(unsigned ID) {
assert(SwitchCaseStmts[ID] != 0 && "No SwitchCase with this ID");
return SwitchCaseStmts[ID];
}
/// \brief Record that the given label statement has been
/// deserialized and has the given ID.
void PCHReader::RecordLabelStmt(LabelStmt *S, unsigned ID) {
assert(LabelStmts.find(ID) == LabelStmts.end() &&
"Deserialized label twice");
LabelStmts[ID] = S;
// If we've already seen any goto statements that point to this
// label, resolve them now.
typedef std::multimap<unsigned, GotoStmt *>::iterator GotoIter;
std::pair<GotoIter, GotoIter> Gotos = UnresolvedGotoStmts.equal_range(ID);
for (GotoIter Goto = Gotos.first; Goto != Gotos.second; ++Goto)
Goto->second->setLabel(S);
UnresolvedGotoStmts.erase(Gotos.first, Gotos.second);
// If we've already seen any address-label statements that point to
// this label, resolve them now.
typedef std::multimap<unsigned, AddrLabelExpr *>::iterator AddrLabelIter;
std::pair<AddrLabelIter, AddrLabelIter> AddrLabels
= UnresolvedAddrLabelExprs.equal_range(ID);
for (AddrLabelIter AddrLabel = AddrLabels.first;
AddrLabel != AddrLabels.second; ++AddrLabel)
AddrLabel->second->setLabel(S);
UnresolvedAddrLabelExprs.erase(AddrLabels.first, AddrLabels.second);
}
/// \brief Set the label of the given statement to the label
/// identified by ID.
///
/// Depending on the order in which the label and other statements
/// referencing that label occur, this operation may complete
/// immediately (updating the statement) or it may queue the
/// statement to be back-patched later.
void PCHReader::SetLabelOf(GotoStmt *S, unsigned ID) {
std::map<unsigned, LabelStmt *>::iterator Label = LabelStmts.find(ID);
if (Label != LabelStmts.end()) {
// We've already seen this label, so set the label of the goto and
// we're done.
S->setLabel(Label->second);
} else {
// We haven't seen this label yet, so add this goto to the set of
// unresolved goto statements.
UnresolvedGotoStmts.insert(std::make_pair(ID, S));
}
}
/// \brief Set the label of the given expression to the label
/// identified by ID.
///
/// Depending on the order in which the label and other statements
/// referencing that label occur, this operation may complete
/// immediately (updating the statement) or it may queue the
/// statement to be back-patched later.
void PCHReader::SetLabelOf(AddrLabelExpr *S, unsigned ID) {
std::map<unsigned, LabelStmt *>::iterator Label = LabelStmts.find(ID);
if (Label != LabelStmts.end()) {
// We've already seen this label, so set the label of the
// label-address expression and we're done.
S->setLabel(Label->second);
} else {
// We haven't seen this label yet, so add this label-address
// expression to the set of unresolved label-address expressions.
UnresolvedAddrLabelExprs.insert(std::make_pair(ID, S));
}
}
PCHReader::LoadingTypeOrDecl::LoadingTypeOrDecl(PCHReader &Reader)
: Reader(Reader), Parent(Reader.CurrentlyLoadingTypeOrDecl) {
Reader.CurrentlyLoadingTypeOrDecl = this;
}
PCHReader::LoadingTypeOrDecl::~LoadingTypeOrDecl() {
if (!Parent) {
// If any identifiers with corresponding top-level declarations have
// been loaded, load those declarations now.
while (!Reader.PendingIdentifierInfos.empty()) {
Reader.SetGloballyVisibleDecls(Reader.PendingIdentifierInfos.front().II,
Reader.PendingIdentifierInfos.front().DeclIDs,
true);
Reader.PendingIdentifierInfos.pop_front();
}
}
Reader.CurrentlyLoadingTypeOrDecl = Parent;
}
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