aboutsummaryrefslogtreecommitdiff
path: root/lib/Basic/SourceManager.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'lib/Basic/SourceManager.cpp')
-rw-r--r--lib/Basic/SourceManager.cpp350
1 files changed, 225 insertions, 125 deletions
diff --git a/lib/Basic/SourceManager.cpp b/lib/Basic/SourceManager.cpp
index 633d86c1eb8a..044c88dd2bf7 100644
--- a/lib/Basic/SourceManager.cpp
+++ b/lib/Basic/SourceManager.cpp
@@ -15,13 +15,16 @@
#include "clang/Basic/SourceManagerInternals.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/FileManager.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/ADT/Optional.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/System/Path.h"
+#include "llvm/Support/Path.h"
#include <algorithm>
#include <string>
#include <cstring>
+#include <sys/stat.h>
using namespace clang;
using namespace SrcMgr;
@@ -66,100 +69,86 @@ const llvm::MemoryBuffer *ContentCache::getBuffer(Diagnostic &Diag,
const SourceManager &SM,
SourceLocation Loc,
bool *Invalid) const {
- if (Invalid)
- *Invalid = false;
-
- // Lazily create the Buffer for ContentCaches that wrap files.
- if (!Buffer.getPointer() && Entry) {
- std::string ErrorStr;
- struct stat FileInfo;
- Buffer.setPointer(MemoryBuffer::getFile(Entry->getName(), &ErrorStr,
- Entry->getSize(), &FileInfo));
+ // Lazily create the Buffer for ContentCaches that wrap files. If we already
+ // computed it, jsut return what we have.
+ if (Buffer.getPointer() || Entry == 0) {
+ if (Invalid)
+ *Invalid = isBufferInvalid();
- // If we were unable to open the file, then we are in an inconsistent
- // situation where the content cache referenced a file which no longer
- // exists. Most likely, we were using a stat cache with an invalid entry but
- // the file could also have been removed during processing. Since we can't
- // really deal with this situation, just create an empty buffer.
- //
- // FIXME: This is definitely not ideal, but our immediate clients can't
- // currently handle returning a null entry here. Ideally we should detect
- // that we are in an inconsistent situation and error out as quickly as
- // possible.
- if (!Buffer.getPointer()) {
- const llvm::StringRef FillStr("<<<MISSING SOURCE FILE>>>\n");
- Buffer.setPointer(MemoryBuffer::getNewMemBuffer(Entry->getSize(),
- "<invalid>"));
- char *Ptr = const_cast<char*>(Buffer.getPointer()->getBufferStart());
- for (unsigned i = 0, e = Entry->getSize(); i != e; ++i)
- Ptr[i] = FillStr[i % FillStr.size()];
-
- if (Diag.isDiagnosticInFlight())
- Diag.SetDelayedDiagnostic(diag::err_cannot_open_file,
- Entry->getName(), ErrorStr);
- else
- Diag.Report(FullSourceLoc(Loc, SM), diag::err_cannot_open_file)
- << Entry->getName() << ErrorStr;
-
- Buffer.setInt(Buffer.getInt() | InvalidFlag);
-
- // FIXME: This conditionalization is horrible, but we see spurious failures
- // in the test suite due to this warning and no one has had time to hunt it
- // down. So for now, we just don't emit this diagnostic on Win32, and hope
- // nothing bad happens.
- //
- // PR6812.
-#if !defined(LLVM_ON_WIN32)
- } else if (FileInfo.st_size != Entry->getSize() ||
- FileInfo.st_mtime != Entry->getModificationTime()) {
- // Check that the file's size and modification time are the same
- // as in the file entry (which may have come from a stat cache).
- if (Diag.isDiagnosticInFlight())
- Diag.SetDelayedDiagnostic(diag::err_file_modified,
- Entry->getName());
- else
- Diag.Report(FullSourceLoc(Loc, SM), diag::err_file_modified)
- << Entry->getName();
-
- Buffer.setInt(Buffer.getInt() | InvalidFlag);
-#endif
- }
+ return Buffer.getPointer();
+ }
+
+ std::string ErrorStr;
+ Buffer.setPointer(SM.getFileManager().getBufferForFile(Entry, &ErrorStr));
+
+ // If we were unable to open the file, then we are in an inconsistent
+ // situation where the content cache referenced a file which no longer
+ // exists. Most likely, we were using a stat cache with an invalid entry but
+ // the file could also have been removed during processing. Since we can't
+ // really deal with this situation, just create an empty buffer.
+ //
+ // FIXME: This is definitely not ideal, but our immediate clients can't
+ // currently handle returning a null entry here. Ideally we should detect
+ // that we are in an inconsistent situation and error out as quickly as
+ // possible.
+ if (!Buffer.getPointer()) {
+ const llvm::StringRef FillStr("<<<MISSING SOURCE FILE>>>\n");
+ Buffer.setPointer(MemoryBuffer::getNewMemBuffer(Entry->getSize(),
+ "<invalid>"));
+ char *Ptr = const_cast<char*>(Buffer.getPointer()->getBufferStart());
+ for (unsigned i = 0, e = Entry->getSize(); i != e; ++i)
+ Ptr[i] = FillStr[i % FillStr.size()];
+
+ if (Diag.isDiagnosticInFlight())
+ Diag.SetDelayedDiagnostic(diag::err_cannot_open_file,
+ Entry->getName(), ErrorStr);
+ else
+ Diag.Report(Loc, diag::err_cannot_open_file)
+ << Entry->getName() << ErrorStr;
+
+ Buffer.setInt(Buffer.getInt() | InvalidFlag);
- // If the buffer is valid, check to see if it has a UTF Byte Order Mark
- // (BOM). We only support UTF-8 without a BOM right now. See
- // http://en.wikipedia.org/wiki/Byte_order_mark for more information.
- if (!isBufferInvalid()) {
- llvm::StringRef BufStr = Buffer.getPointer()->getBuffer();
- const char *BOM = 0;
- if (BufStr.startswith("\xFE\xBB\xBF"))
- BOM = "UTF-8";
- else if (BufStr.startswith("\xFE\xFF"))
- BOM = "UTF-16 (BE)";
- else if (BufStr.startswith("\xFF\xFE"))
- BOM = "UTF-16 (LE)";
- else if (BufStr.startswith(llvm::StringRef("\x00\x00\xFE\xFF", 4)))
- BOM = "UTF-32 (BE)";
- else if (BufStr.startswith(llvm::StringRef("\xFF\xFE\x00\x00", 4)))
- BOM = "UTF-32 (LE)";
- else if (BufStr.startswith("\x2B\x2F\x76"))
- BOM = "UTF-7";
- else if (BufStr.startswith("\xF7\x64\x4C"))
- BOM = "UTF-1";
- else if (BufStr.startswith("\xDD\x73\x66\x73"))
- BOM = "UTF-EBCDIC";
- else if (BufStr.startswith("\x0E\xFE\xFF"))
- BOM = "SDSU";
- else if (BufStr.startswith("\xFB\xEE\x28"))
- BOM = "BOCU-1";
- else if (BufStr.startswith("\x84\x31\x95\x33"))
- BOM = "BOCU-1";
-
- if (BOM) {
- Diag.Report(FullSourceLoc(Loc, SM), diag::err_unsupported_bom)
- << BOM << Entry->getName();
- Buffer.setInt(1);
- }
- }
+ if (Invalid) *Invalid = true;
+ return Buffer.getPointer();
+ }
+
+ // Check that the file's size is the same as in the file entry (which may
+ // have come from a stat cache).
+ if (getRawBuffer()->getBufferSize() != (size_t)Entry->getSize()) {
+ if (Diag.isDiagnosticInFlight())
+ Diag.SetDelayedDiagnostic(diag::err_file_modified,
+ Entry->getName());
+ else
+ Diag.Report(Loc, diag::err_file_modified)
+ << Entry->getName();
+
+ Buffer.setInt(Buffer.getInt() | InvalidFlag);
+ if (Invalid) *Invalid = true;
+ return Buffer.getPointer();
+ }
+
+ // If the buffer is valid, check to see if it has a UTF Byte Order Mark
+ // (BOM). We only support UTF-8 without a BOM right now. See
+ // http://en.wikipedia.org/wiki/Byte_order_mark for more information.
+ llvm::StringRef BufStr = Buffer.getPointer()->getBuffer();
+ const char *BOM = llvm::StringSwitch<const char *>(BufStr)
+ .StartsWith("\xEF\xBB\xBF", "UTF-8")
+ .StartsWith("\xFE\xFF", "UTF-16 (BE)")
+ .StartsWith("\xFF\xFE", "UTF-16 (LE)")
+ .StartsWith("\x00\x00\xFE\xFF", "UTF-32 (BE)")
+ .StartsWith("\xFF\xFE\x00\x00", "UTF-32 (LE)")
+ .StartsWith("\x2B\x2F\x76", "UTF-7")
+ .StartsWith("\xF7\x64\x4C", "UTF-1")
+ .StartsWith("\xDD\x73\x66\x73", "UTF-EBCDIC")
+ .StartsWith("\x0E\xFE\xFF", "SDSU")
+ .StartsWith("\xFB\xEE\x28", "BOCU-1")
+ .StartsWith("\x84\x31\x95\x33", "GB-18030")
+ .Default(0);
+
+ if (BOM) {
+ Diag.Report(Loc, diag::err_unsupported_bom)
+ << BOM << Entry->getName();
+ Buffer.setInt(Buffer.getInt() | InvalidFlag);
}
if (Invalid)
@@ -350,6 +339,14 @@ LineTableInfo &SourceManager::getLineTable() {
// Private 'Create' methods.
//===----------------------------------------------------------------------===//
+SourceManager::SourceManager(Diagnostic &Diag, FileManager &FileMgr)
+ : Diag(Diag), FileMgr(FileMgr),
+ ExternalSLocEntries(0), LineTable(0), NumLinearScans(0),
+ NumBinaryProbes(0) {
+ clearIDTables();
+ Diag.setSourceManager(this);
+}
+
SourceManager::~SourceManager() {
delete LineTable;
@@ -525,25 +522,32 @@ SourceManager::getMemoryBufferForFile(const FileEntry *File,
return IR->getBuffer(Diag, *this, SourceLocation(), Invalid);
}
-bool SourceManager::overrideFileContents(const FileEntry *SourceFile,
+void SourceManager::overrideFileContents(const FileEntry *SourceFile,
const llvm::MemoryBuffer *Buffer,
bool DoNotFree) {
const SrcMgr::ContentCache *IR = getOrCreateContentCache(SourceFile);
- if (IR == 0)
- return true;
+ assert(IR && "getOrCreateContentCache() cannot return NULL");
const_cast<SrcMgr::ContentCache *>(IR)->replaceBuffer(Buffer, DoNotFree);
- return false;
}
llvm::StringRef SourceManager::getBufferData(FileID FID, bool *Invalid) const {
bool MyInvalid = false;
- const llvm::MemoryBuffer *Buf = getBuffer(FID, &MyInvalid);
+ const SLocEntry &SLoc = getSLocEntry(FID.ID);
+ if (!SLoc.isFile()) {
+ if (Invalid)
+ *Invalid = true;
+ return "<<<<<INVALID SOURCE LOCATION>>>>>";
+ }
+
+ const llvm::MemoryBuffer *Buf
+ = SLoc.getFile().getContentCache()->getBuffer(Diag, *this, SourceLocation(),
+ &MyInvalid);
if (Invalid)
*Invalid = MyInvalid;
if (MyInvalid)
- return "";
+ return "<<<<<INVALID SOURCE LOCATION>>>>>";
return Buf->getBuffer();
}
@@ -796,21 +800,30 @@ unsigned SourceManager::getColumnNumber(FileID FID, unsigned FilePos,
return FilePos-LineStart+1;
}
+// isInvalid - Return the result of calling loc.isInvalid(), and
+// if Invalid is not null, set its value to same.
+static bool isInvalid(SourceLocation Loc, bool *Invalid) {
+ bool MyInvalid = Loc.isInvalid();
+ if (Invalid)
+ *Invalid = MyInvalid;
+ return MyInvalid;
+}
+
unsigned SourceManager::getSpellingColumnNumber(SourceLocation Loc,
bool *Invalid) const {
- if (Loc.isInvalid()) return 0;
+ if (isInvalid(Loc, Invalid)) return 0;
std::pair<FileID, unsigned> LocInfo = getDecomposedSpellingLoc(Loc);
return getColumnNumber(LocInfo.first, LocInfo.second, Invalid);
}
unsigned SourceManager::getInstantiationColumnNumber(SourceLocation Loc,
bool *Invalid) const {
- if (Loc.isInvalid()) return 0;
+ if (isInvalid(Loc, Invalid)) return 0;
std::pair<FileID, unsigned> LocInfo = getDecomposedInstantiationLoc(Loc);
return getColumnNumber(LocInfo.first, LocInfo.second, Invalid);
}
-static DISABLE_INLINE void
+static LLVM_ATTRIBUTE_NOINLINE void
ComputeLineNumbers(Diagnostic &Diag, ContentCache *FI,
llvm::BumpPtrAllocator &Alloc,
const SourceManager &SM, bool &Invalid);
@@ -974,13 +987,13 @@ unsigned SourceManager::getLineNumber(FileID FID, unsigned FilePos,
unsigned SourceManager::getInstantiationLineNumber(SourceLocation Loc,
bool *Invalid) const {
- if (Loc.isInvalid()) return 0;
+ if (isInvalid(Loc, Invalid)) return 0;
std::pair<FileID, unsigned> LocInfo = getDecomposedInstantiationLoc(Loc);
return getLineNumber(LocInfo.first, LocInfo.second);
}
unsigned SourceManager::getSpellingLineNumber(SourceLocation Loc,
bool *Invalid) const {
- if (Loc.isInvalid()) return 0;
+ if (isInvalid(Loc, Invalid)) return 0;
std::pair<FileID, unsigned> LocInfo = getDecomposedSpellingLoc(Loc);
return getLineNumber(LocInfo.first, LocInfo.second);
}
@@ -1021,7 +1034,7 @@ SourceManager::getFileCharacteristic(SourceLocation Loc) const {
/// for normal clients.
const char *SourceManager::getBufferName(SourceLocation Loc,
bool *Invalid) const {
- if (Loc.isInvalid()) return "<invalid loc>";
+ if (isInvalid(Loc, Invalid)) return "<invalid loc>";
return getBuffer(getFileID(Loc), Invalid)->getBufferIdentifier();
}
@@ -1051,8 +1064,14 @@ PresumedLoc SourceManager::getPresumedLoc(SourceLocation Loc) const {
Filename = C->Entry->getName();
else
Filename = C->getBuffer(Diag, *this)->getBufferIdentifier();
- unsigned LineNo = getLineNumber(LocInfo.first, LocInfo.second);
- unsigned ColNo = getColumnNumber(LocInfo.first, LocInfo.second);
+ bool Invalid = false;
+ unsigned LineNo = getLineNumber(LocInfo.first, LocInfo.second, &Invalid);
+ if (Invalid)
+ return PresumedLoc();
+ unsigned ColNo = getColumnNumber(LocInfo.first, LocInfo.second, &Invalid);
+ if (Invalid)
+ return PresumedLoc();
+
SourceLocation IncludeLoc = FI.getIncludeLoc();
// If we have #line directives in this file, update and overwrite the physical
@@ -1090,38 +1109,65 @@ PresumedLoc SourceManager::getPresumedLoc(SourceLocation Loc) const {
// Other miscellaneous methods.
//===----------------------------------------------------------------------===//
+/// \brief Retrieve the inode for the given file entry, if possible.
+///
+/// This routine involves a system call, and therefore should only be used
+/// in non-performance-critical code.
+static llvm::Optional<ino_t> getActualFileInode(const FileEntry *File) {
+ if (!File)
+ return llvm::Optional<ino_t>();
+
+ struct stat StatBuf;
+ if (::stat(File->getName(), &StatBuf))
+ return llvm::Optional<ino_t>();
+
+ return StatBuf.st_ino;
+}
+
/// \brief Get the source location for the given file:line:col triplet.
///
/// If the source file is included multiple times, the source location will
/// be based upon the first inclusion.
SourceLocation SourceManager::getLocation(const FileEntry *SourceFile,
- unsigned Line, unsigned Col) const {
+ unsigned Line, unsigned Col) {
assert(SourceFile && "Null source file!");
assert(Line && Col && "Line and column should start from 1!");
- fileinfo_iterator FI = FileInfos.find(SourceFile);
- if (FI == FileInfos.end())
- return SourceLocation();
- ContentCache *Content = FI->second;
-
- // If this is the first use of line information for this buffer, compute the
- /// SourceLineCache for it on demand.
- if (Content->SourceLineCache == 0) {
- bool MyInvalid = false;
- ComputeLineNumbers(Diag, Content, ContentCacheAlloc, *this, MyInvalid);
- if (MyInvalid)
- return SourceLocation();
- }
-
// Find the first file ID that corresponds to the given file.
FileID FirstFID;
// First, check the main file ID, since it is common to look for a
// location in the main file.
+ llvm::Optional<ino_t> SourceFileInode;
+ llvm::Optional<llvm::StringRef> SourceFileName;
if (!MainFileID.isInvalid()) {
const SLocEntry &MainSLoc = getSLocEntry(MainFileID);
- if (MainSLoc.isFile() && MainSLoc.getFile().getContentCache() == Content)
- FirstFID = MainFileID;
+ if (MainSLoc.isFile()) {
+ const ContentCache *MainContentCache
+ = MainSLoc.getFile().getContentCache();
+ if (!MainContentCache) {
+ // Can't do anything
+ } else if (MainContentCache->Entry == SourceFile) {
+ FirstFID = MainFileID;
+ } else {
+ // Fall back: check whether we have the same base name and inode
+ // as the main file.
+ const FileEntry *MainFile = MainContentCache->Entry;
+ SourceFileName = llvm::sys::path::filename(SourceFile->getName());
+ if (*SourceFileName == llvm::sys::path::filename(MainFile->getName())) {
+ SourceFileInode = getActualFileInode(SourceFile);
+ if (SourceFileInode) {
+ if (llvm::Optional<ino_t> MainFileInode
+ = getActualFileInode(MainFile)) {
+ if (*SourceFileInode == *MainFileInode) {
+ FirstFID = MainFileID;
+ SourceFile = MainFile;
+ }
+ }
+ }
+ }
+ }
+ }
}
if (FirstFID.isInvalid()) {
@@ -1129,16 +1175,63 @@ SourceLocation SourceManager::getLocation(const FileEntry *SourceFile,
// through all of the source locations.
for (unsigned I = 0, N = sloc_entry_size(); I != N; ++I) {
const SLocEntry &SLoc = getSLocEntry(I);
- if (SLoc.isFile() && SLoc.getFile().getContentCache() == Content) {
+ if (SLoc.isFile() &&
+ SLoc.getFile().getContentCache() &&
+ SLoc.getFile().getContentCache()->Entry == SourceFile) {
FirstFID = FileID::get(I);
break;
}
}
}
+
+ // If we haven't found what we want yet, try again, but this time stat()
+ // each of the files in case the files have changed since we originally
+ // parsed the file.
+ if (FirstFID.isInvalid() &&
+ (SourceFileName ||
+ (SourceFileName = llvm::sys::path::filename(SourceFile->getName()))) &&
+ (SourceFileInode ||
+ (SourceFileInode = getActualFileInode(SourceFile)))) {
+ for (unsigned I = 0, N = sloc_entry_size(); I != N; ++I) {
+ const SLocEntry &SLoc = getSLocEntry(I);
+ if (SLoc.isFile()) {
+ const ContentCache *FileContentCache
+ = SLoc.getFile().getContentCache();
+ const FileEntry *Entry =FileContentCache? FileContentCache->Entry : 0;
+ if (Entry &&
+ *SourceFileName == llvm::sys::path::filename(Entry->getName())) {
+ if (llvm::Optional<ino_t> EntryInode = getActualFileInode(Entry)) {
+ if (*SourceFileInode == *EntryInode) {
+ FirstFID = FileID::get(I);
+ SourceFile = Entry;
+ break;
+ }
+ }
+ }
+ }
+ }
+ }
if (FirstFID.isInvalid())
return SourceLocation();
+ if (Line == 1 && Col == 1)
+ return getLocForStartOfFile(FirstFID);
+
+ ContentCache *Content
+ = const_cast<ContentCache *>(getOrCreateContentCache(SourceFile));
+ if (!Content)
+ return SourceLocation();
+
+ // If this is the first use of line information for this buffer, compute the
+ /// SourceLineCache for it on demand.
+ if (Content->SourceLineCache == 0) {
+ bool MyInvalid = false;
+ ComputeLineNumbers(Diag, Content, ContentCacheAlloc, *this, MyInvalid);
+ if (MyInvalid)
+ return SourceLocation();
+ }
+
if (Line > Content->NumLines) {
unsigned Size = Content->getBuffer(Diag, *this)->getBufferSize();
if (Size > 0)
@@ -1190,6 +1283,13 @@ bool SourceManager::isBeforeInTranslationUnit(SourceLocation LHS,
if (LHS == RHS)
return false;
+ // If both locations are macro instantiations, the order of their offsets
+ // reflect the order that the tokens, pointed to by these locations, were
+ // instantiated (during parsing each token that is instantiated by a macro,
+ // expands the SLocEntries).
+ if (LHS.isMacroID() && RHS.isMacroID())
+ return LHS.getOffset() < RHS.getOffset();
+
std::pair<FileID, unsigned> LOffs = getDecomposedLoc(LHS);
std::pair<FileID, unsigned> ROffs = getDecomposedLoc(RHS);
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-07 04:01:56 +0000