From: Reid Spencer <rspencer@reidspencer.com>
Date: Thu, 24 Aug 2006 23:45:08 +0000 (+0000)
Subject: For PR797:
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=commitdiff_plain;h=0ff2d31766209ce1a69d4d2c5d35761ef57362aa

For PR797:
Remove exception handling from the bytecode archiver and adjust the llvm-ar
tool to accommodate the new interfaces.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29866 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/Bytecode/Archive.h b/include/llvm/Bytecode/Archive.h
index 62a05bbcd80..72942423cc2 100644
--- a/include/llvm/Bytecode/Archive.h
+++ b/include/llvm/Bytecode/Archive.h
@@ -167,8 +167,9 @@ class ArchiveMember {
     /// of the file specified by \p File. The contents of \p this will be
     /// updated to reflect the new data from \p File. The \p File must exist and
     /// be readable on entry to this method.
+    /// @returns true if an error occurred, false otherwise
     /// @brief Replace contents of archive member with a new file.
-    void replaceWith(const sys::Path &aFile);
+    bool replaceWith(const sys::Path &aFile, std::string* ErrMsg);
 
   /// @}
   /// @name ilist methods - do not use
@@ -439,8 +440,8 @@ class Archive {
     /// name will be truncated at 15 characters. If \p Compress is specified,
     /// all archive members will be compressed before being written. If
     /// \p PrintSymTab is true, the symbol table will be printed to std::cout.
-    /// @returns false if an error occurred, \p error set to error message
-    /// @returns true if the writing succeeded.
+    /// @returns true if an error occurred, \p error set to error message
+    /// @returns false if the writing succeeded.
     /// @brief Write (possibly modified) archive contents to disk
     bool writeToDisk(
       bool CreateSymbolTable=false,   ///< Create Symbol table
@@ -453,10 +454,13 @@ class Archive {
     /// to determine just enough information to create an ArchiveMember object
     /// which is then inserted into the Archive object's ilist at the location
     /// given by \p where.
-    /// @throws std::string if an error occurs reading the \p filename.
-    /// @returns nothing
+    /// @returns true if an error occured, false otherwise
     /// @brief Add a file to the archive.
-    void addFileBefore(const sys::Path& filename, iterator where);
+    bool addFileBefore(
+      const sys::Path& filename, ///< The file to be added
+      iterator where,            ///< Insertion point
+      std::string* ErrMsg        ///< Optional error message location
+    );
 
   /// @}
   /// @name Implementation
@@ -464,7 +468,7 @@ class Archive {
   protected:
     /// @brief Construct an Archive for \p filename and optionally  map it
     /// into memory.
-    Archive(const sys::Path& filename, bool map = false );
+    Archive(const sys::Path& filename);
 
     /// @param error Set to address of a std::string to get error messages
     /// @returns false on error
@@ -500,8 +504,8 @@ class Archive {
     /// Writes one ArchiveMember to an ofstream. If an error occurs, returns
     /// false, otherwise true. If an error occurs and error is non-null then 
     /// it will be set to an error message.
-    /// @returns true Writing member succeeded
-    /// @returns false Writing member failed, \p error set to error message
+    /// @returns false Writing member succeeded
+    /// @returns true Writing member failed, \p error set to error message
     bool writeMember(
       const ArchiveMember& member, ///< The member to be written
       std::ofstream& ARFile,       ///< The file to write member onto
@@ -515,6 +519,9 @@ class Archive {
     bool fillHeader(const ArchiveMember&mbr,
                     ArchiveMemberHeader& hdr,int sz, bool TruncateNames) const;
 
+    /// @brief Maps archive into memory
+    bool mapToMemory(std::string* ErrMsg);
+
     /// @brief Frees all the members and unmaps the archive file.
     void cleanUpMemory();
 
@@ -525,6 +532,7 @@ class Archive {
     typedef std::map<unsigned,std::pair<ModuleProvider*,ArchiveMember*> >
       ModuleMap;
 
+
   /// @}
   /// @name Data
   /// @{
diff --git a/lib/Archive/Archive.cpp b/lib/Archive/Archive.cpp
index d5b56ca85e2..a661a4e992a 100644
--- a/lib/Archive/Archive.cpp
+++ b/lib/Archive/Archive.cpp
@@ -61,7 +61,7 @@ ArchiveMember::ArchiveMember(Archive* PAR)
 // This method allows an ArchiveMember to be replaced with the data for a
 // different file, presumably as an update to the member. It also makes sure
 // the flags are reset correctly.
-void ArchiveMember::replaceWith(const sys::Path& newFile) {
+bool ArchiveMember::replaceWith(const sys::Path& newFile, std::string* ErrMsg) {
   assert(newFile.exists() && "Can't replace with a non-existent file");
   data = 0;
   path = newFile;
@@ -110,8 +110,8 @@ void ArchiveMember::replaceWith(const sys::Path& newFile) {
     path.getMagicNumber(magic,4);
     signature = magic.c_str();
     std::string err;
-    if (path.getFileStatus(info, &err))
-      throw err;
+    if (path.getFileStatus(info, ErrMsg))
+      return true;
   }
 
   // Determine what kind of file it is
@@ -127,23 +127,27 @@ void ArchiveMember::replaceWith(const sys::Path& newFile) {
       flags &= ~(BytecodeFlag|CompressedBytecodeFlag);
       break;
   }
+  return false;
 }
 
 // Archive constructor - this is the only constructor that gets used for the
 // Archive class. Everything else (default,copy) is deprecated. This just
 // initializes and maps the file into memory, if requested.
-Archive::Archive(const sys::Path& filename, bool map )
+Archive::Archive(const sys::Path& filename)
   : archPath(filename), members(), mapfile(0), base(0), symTab(), strtab(),
     symTabSize(0), firstFileOffset(0), modules(), foreignST(0)
 {
-  if (map) {
-    std::string ErrMsg;
-    mapfile = new sys::MappedFile();
-    if (mapfile->open(filename, sys::MappedFile::READ_ACCESS, &ErrMsg))
-      throw ErrMsg;
-    if (!(base = (char*) mapfile->map(&ErrMsg)))
-      throw ErrMsg;
-  }
+}
+
+bool
+Archive::mapToMemory(std::string* ErrMsg)
+{
+  mapfile = new sys::MappedFile();
+  if (mapfile->open(archPath, sys::MappedFile::READ_ACCESS, ErrMsg))
+    return true;
+  if (!(base = (char*) mapfile->map(ErrMsg)))
+    return true;
+  return false;
 }
 
 void Archive::cleanUpMemory() {
diff --git a/lib/Archive/ArchiveReader.cpp b/lib/Archive/ArchiveReader.cpp
index c8dd17c8f11..38aa07243c7 100644
--- a/lib/Archive/ArchiveReader.cpp
+++ b/lib/Archive/ArchiveReader.cpp
@@ -330,7 +330,9 @@ Archive::loadArchive(std::string* error) {
 Archive*
 Archive::OpenAndLoad(const sys::Path& file, std::string* ErrorMessage) 
 {
-  std::auto_ptr<Archive> result ( new Archive(file, true));
+  std::auto_ptr<Archive> result ( new Archive(file));
+  if (result->mapToMemory(ErrorMessage))
+    return 0;
   if (!result->loadArchive(ErrorMessage))
     return 0;
   return result.release();
@@ -437,7 +439,9 @@ Archive::loadSymbolTable(std::string* ErrorMsg) {
 // Open the archive and load just the symbol tables
 Archive*
 Archive::OpenAndLoadSymbols(const sys::Path& file, std::string* ErrorMessage) {
-  std::auto_ptr<Archive> result ( new Archive(file, true) );
+  std::auto_ptr<Archive> result ( new Archive(file) );
+  if (result->mapToMemory(ErrorMessage))
+    return 0;
   if (!result->loadSymbolTable(ErrorMessage))
     return 0;
   return result.release();
diff --git a/lib/Archive/ArchiveWriter.cpp b/lib/Archive/ArchiveWriter.cpp
index 86da17cc77f..3746dbff8a1 100644
--- a/lib/Archive/ArchiveWriter.cpp
+++ b/lib/Archive/ArchiveWriter.cpp
@@ -64,7 +64,7 @@ inline unsigned numVbrBytes(unsigned num) {
 // Create an empty archive.
 Archive*
 Archive::CreateEmpty(const sys::Path& FilePath ) {
-  Archive* result = new Archive(FilePath,false);
+  Archive* result = new Archive(FilePath);
   return result;
 }
 
@@ -151,17 +151,17 @@ Archive::fillHeader(const ArchiveMember &mbr, ArchiveMemberHeader& hdr,
 
 // Insert a file into the archive before some other member. This also takes care
 // of extracting the necessary flags and information from the file.
-void
-Archive::addFileBefore(const sys::Path& filePath, iterator where) {
+bool
+Archive::addFileBefore(const sys::Path& filePath, iterator where, 
+                        std::string* ErrMsg) {
   assert(filePath.exists() && "Can't add a non-existent file");
 
   ArchiveMember* mbr = new ArchiveMember(this);
 
   mbr->data = 0;
   mbr->path = filePath;
-  std::string err;
-  if (mbr->path.getFileStatus(mbr->info, &err))
-    throw err;
+  if (mbr->path.getFileStatus(mbr->info, ErrMsg))
+    return true;
 
   unsigned flags = 0;
   bool hasSlash = filePath.toString().find('/') != std::string::npos;
@@ -183,6 +183,7 @@ Archive::addFileBefore(const sys::Path& filePath, iterator where) {
   }
   mbr->flags = flags;
   members.insert(where,mbr);
+  return false;
 }
 
 // Write one member out to the file.
@@ -193,7 +194,7 @@ Archive::writeMember(
   bool CreateSymbolTable,
   bool TruncateNames,
   bool ShouldCompress,
-  std::string* error
+  std::string* ErrMsg
 ) {
 
   unsigned filepos = ARFile.tellp();
@@ -205,12 +206,11 @@ Archive::writeMember(
   const char* data = (const char*)member.getData();
   sys::MappedFile* mFile = 0;
   if (!data) {
-    std::string ErrMsg;
     mFile = new sys::MappedFile();
-    if (mFile->open(member.getPath(), sys::MappedFile::READ_ACCESS, &ErrMsg))
-      throw ErrMsg;
-    if (!(data = (const char*) mFile->map(&ErrMsg)))
-      throw ErrMsg;
+    if (mFile->open(member.getPath(), sys::MappedFile::READ_ACCESS, ErrMsg))
+      return true;
+    if (!(data = (const char*) mFile->map(ErrMsg)))
+      return true;
     fSize = mFile->size();
   }
 
@@ -246,8 +246,9 @@ Archive::writeMember(
         mFile->close();
         delete mFile;
       }
-      if (error)
-        *error = "Can't parse bytecode member: " + member.getPath().toString();
+      if (ErrMsg)
+        *ErrMsg = "Can't parse bytecode member: " + member.getPath().toString();
+      return true;
     }
   }
 
@@ -274,9 +275,9 @@ Archive::writeMember(
       data +=4;
       fSize -= 4;
     }
-    fSize = Compressor::compressToNewBuffer(data,fSize,output,error);
+    fSize = Compressor::compressToNewBuffer(data,fSize,output,ErrMsg);
     if (fSize == 0)
-      return false;
+      return true;
     data = output;
     if (member.isBytecode())
       hdrSize = -fSize-4;
@@ -320,7 +321,7 @@ Archive::writeMember(
     mFile->close();
     delete mFile;
   }
-  return true;
+  return false;
 }
 
 // Write out the LLVM symbol table as an archive member to the file.
@@ -380,7 +381,7 @@ Archive::writeSymbolTable(std::ofstream& ARFile) {
 // compressing each archive member.
 bool
 Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, bool Compress,
-                     std::string* error)
+                     std::string* ErrMsg)
 {
   // Make sure they haven't opened up the file, not loaded it,
   // but are now trying to write it which would wipe out the file.
@@ -389,8 +390,8 @@ Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, bool Compress,
 
   // Create a temporary file to store the archive in
   sys::Path TmpArchive = archPath;
-  if (TmpArchive.createTemporaryFileOnDisk(error))
-    return false;
+  if (TmpArchive.createTemporaryFileOnDisk(ErrMsg))
+    return true;
 
   // Make sure the temporary gets removed if we crash
   sys::RemoveFileOnSignal(TmpArchive);
@@ -404,9 +405,9 @@ Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, bool Compress,
   if (!ArchiveFile.is_open() || ArchiveFile.bad()) {
     if (TmpArchive.exists())
       TmpArchive.eraseFromDisk();
-    if (error)
-      *error = "Error opening archive file: " + archPath.toString();
-    return false;
+    if (ErrMsg)
+      *ErrMsg = "Error opening archive file: " + archPath.toString();
+    return true;
   }
 
   // If we're creating a symbol table, reset it now
@@ -421,12 +422,12 @@ Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, bool Compress,
   // Loop over all member files, and write them out. Note that this also
   // builds the symbol table, symTab.
   for (MembersList::iterator I = begin(), E = end(); I != E; ++I) {
-    if (!writeMember(*I, ArchiveFile, CreateSymbolTable,
-                     TruncateNames, Compress, error)) {
+    if (writeMember(*I, ArchiveFile, CreateSymbolTable,
+                     TruncateNames, Compress, ErrMsg)) {
       if (TmpArchive.exists())
         TmpArchive.eraseFromDisk();
       ArchiveFile.close();
-      return false;
+      return true;
     }
   }
 
@@ -443,27 +444,26 @@ Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, bool Compress,
 
     // Map in the archive we just wrote.
     sys::MappedFile arch;
-    std::string ErrMsg;
-    if (arch.open(TmpArchive, sys::MappedFile::READ_ACCESS, &ErrMsg))
-      throw ErrMsg;
+    if (arch.open(TmpArchive, sys::MappedFile::READ_ACCESS, ErrMsg))
+      return true;
     const char* base;
-    if (!(base = (const char*) arch.map(&ErrMsg)))
-      throw ErrMsg;
+    if (!(base = (const char*) arch.map(ErrMsg)))
+      return true;
 
     // Open another temporary file in order to avoid invalidating the 
     // mmapped data
     sys::Path FinalFilePath = archPath;
-    if (FinalFilePath.createTemporaryFileOnDisk(error))
-      return false;
+    if (FinalFilePath.createTemporaryFileOnDisk(ErrMsg))
+      return true;
     sys::RemoveFileOnSignal(FinalFilePath);
 
     std::ofstream FinalFile(FinalFilePath.c_str(), io_mode);
     if (!FinalFile.is_open() || FinalFile.bad()) {
       if (TmpArchive.exists())
         TmpArchive.eraseFromDisk();
-      if (error)
-        *error = "Error opening archive file: " + FinalFilePath.toString();
-      return false;
+      if (ErrMsg)
+        *ErrMsg = "Error opening archive file: " + FinalFilePath.toString();
+      return true;
     }
 
     // Write the file magic number
@@ -475,11 +475,11 @@ Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, bool Compress,
     // compatibility with other ar(1) implementations as well as allowing the
     // archive to store both native .o and LLVM .bc files, both indexed.
     if (foreignST) {
-      if (!writeMember(*foreignST, FinalFile, false, false, false, error)) {
+      if (writeMember(*foreignST, FinalFile, false, false, false, ErrMsg)) {
         FinalFile.close();
         if (TmpArchive.exists())
           TmpArchive.eraseFromDisk();
-        return false;
+        return true;
       }
     }
 
@@ -496,8 +496,8 @@ Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, bool Compress,
     arch.close();
     
     // Move the final file over top of TmpArchive
-    if (FinalFilePath.renamePathOnDisk(TmpArchive, error))
-      return false;
+    if (FinalFilePath.renamePathOnDisk(TmpArchive, ErrMsg))
+      return true;
   }
   
   // Before we replace the actual archive, we need to forget all the
@@ -505,8 +505,8 @@ Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, bool Compress,
   // this because we cannot replace an open file on Windows.
   cleanUpMemory();
   
-  if (TmpArchive.renamePathOnDisk(archPath, error))
-    return false;
+  if (TmpArchive.renamePathOnDisk(archPath, ErrMsg))
+    return true;
 
-  return true;
+  return false;
 }
diff --git a/lib/Bytecode/Archive/Archive.cpp b/lib/Bytecode/Archive/Archive.cpp
index d5b56ca85e2..a661a4e992a 100644
--- a/lib/Bytecode/Archive/Archive.cpp
+++ b/lib/Bytecode/Archive/Archive.cpp
@@ -61,7 +61,7 @@ ArchiveMember::ArchiveMember(Archive* PAR)
 // This method allows an ArchiveMember to be replaced with the data for a
 // different file, presumably as an update to the member. It also makes sure
 // the flags are reset correctly.
-void ArchiveMember::replaceWith(const sys::Path& newFile) {
+bool ArchiveMember::replaceWith(const sys::Path& newFile, std::string* ErrMsg) {
   assert(newFile.exists() && "Can't replace with a non-existent file");
   data = 0;
   path = newFile;
@@ -110,8 +110,8 @@ void ArchiveMember::replaceWith(const sys::Path& newFile) {
     path.getMagicNumber(magic,4);
     signature = magic.c_str();
     std::string err;
-    if (path.getFileStatus(info, &err))
-      throw err;
+    if (path.getFileStatus(info, ErrMsg))
+      return true;
   }
 
   // Determine what kind of file it is
@@ -127,23 +127,27 @@ void ArchiveMember::replaceWith(const sys::Path& newFile) {
       flags &= ~(BytecodeFlag|CompressedBytecodeFlag);
       break;
   }
+  return false;
 }
 
 // Archive constructor - this is the only constructor that gets used for the
 // Archive class. Everything else (default,copy) is deprecated. This just
 // initializes and maps the file into memory, if requested.
-Archive::Archive(const sys::Path& filename, bool map )
+Archive::Archive(const sys::Path& filename)
   : archPath(filename), members(), mapfile(0), base(0), symTab(), strtab(),
     symTabSize(0), firstFileOffset(0), modules(), foreignST(0)
 {
-  if (map) {
-    std::string ErrMsg;
-    mapfile = new sys::MappedFile();
-    if (mapfile->open(filename, sys::MappedFile::READ_ACCESS, &ErrMsg))
-      throw ErrMsg;
-    if (!(base = (char*) mapfile->map(&ErrMsg)))
-      throw ErrMsg;
-  }
+}
+
+bool
+Archive::mapToMemory(std::string* ErrMsg)
+{
+  mapfile = new sys::MappedFile();
+  if (mapfile->open(archPath, sys::MappedFile::READ_ACCESS, ErrMsg))
+    return true;
+  if (!(base = (char*) mapfile->map(ErrMsg)))
+    return true;
+  return false;
 }
 
 void Archive::cleanUpMemory() {
diff --git a/lib/Bytecode/Archive/ArchiveReader.cpp b/lib/Bytecode/Archive/ArchiveReader.cpp
index c8dd17c8f11..38aa07243c7 100644
--- a/lib/Bytecode/Archive/ArchiveReader.cpp
+++ b/lib/Bytecode/Archive/ArchiveReader.cpp
@@ -330,7 +330,9 @@ Archive::loadArchive(std::string* error) {
 Archive*
 Archive::OpenAndLoad(const sys::Path& file, std::string* ErrorMessage) 
 {
-  std::auto_ptr<Archive> result ( new Archive(file, true));
+  std::auto_ptr<Archive> result ( new Archive(file));
+  if (result->mapToMemory(ErrorMessage))
+    return 0;
   if (!result->loadArchive(ErrorMessage))
     return 0;
   return result.release();
@@ -437,7 +439,9 @@ Archive::loadSymbolTable(std::string* ErrorMsg) {
 // Open the archive and load just the symbol tables
 Archive*
 Archive::OpenAndLoadSymbols(const sys::Path& file, std::string* ErrorMessage) {
-  std::auto_ptr<Archive> result ( new Archive(file, true) );
+  std::auto_ptr<Archive> result ( new Archive(file) );
+  if (result->mapToMemory(ErrorMessage))
+    return 0;
   if (!result->loadSymbolTable(ErrorMessage))
     return 0;
   return result.release();
diff --git a/lib/Bytecode/Archive/ArchiveWriter.cpp b/lib/Bytecode/Archive/ArchiveWriter.cpp
index 86da17cc77f..3746dbff8a1 100644
--- a/lib/Bytecode/Archive/ArchiveWriter.cpp
+++ b/lib/Bytecode/Archive/ArchiveWriter.cpp
@@ -64,7 +64,7 @@ inline unsigned numVbrBytes(unsigned num) {
 // Create an empty archive.
 Archive*
 Archive::CreateEmpty(const sys::Path& FilePath ) {
-  Archive* result = new Archive(FilePath,false);
+  Archive* result = new Archive(FilePath);
   return result;
 }
 
@@ -151,17 +151,17 @@ Archive::fillHeader(const ArchiveMember &mbr, ArchiveMemberHeader& hdr,
 
 // Insert a file into the archive before some other member. This also takes care
 // of extracting the necessary flags and information from the file.
-void
-Archive::addFileBefore(const sys::Path& filePath, iterator where) {
+bool
+Archive::addFileBefore(const sys::Path& filePath, iterator where, 
+                        std::string* ErrMsg) {
   assert(filePath.exists() && "Can't add a non-existent file");
 
   ArchiveMember* mbr = new ArchiveMember(this);
 
   mbr->data = 0;
   mbr->path = filePath;
-  std::string err;
-  if (mbr->path.getFileStatus(mbr->info, &err))
-    throw err;
+  if (mbr->path.getFileStatus(mbr->info, ErrMsg))
+    return true;
 
   unsigned flags = 0;
   bool hasSlash = filePath.toString().find('/') != std::string::npos;
@@ -183,6 +183,7 @@ Archive::addFileBefore(const sys::Path& filePath, iterator where) {
   }
   mbr->flags = flags;
   members.insert(where,mbr);
+  return false;
 }
 
 // Write one member out to the file.
@@ -193,7 +194,7 @@ Archive::writeMember(
   bool CreateSymbolTable,
   bool TruncateNames,
   bool ShouldCompress,
-  std::string* error
+  std::string* ErrMsg
 ) {
 
   unsigned filepos = ARFile.tellp();
@@ -205,12 +206,11 @@ Archive::writeMember(
   const char* data = (const char*)member.getData();
   sys::MappedFile* mFile = 0;
   if (!data) {
-    std::string ErrMsg;
     mFile = new sys::MappedFile();
-    if (mFile->open(member.getPath(), sys::MappedFile::READ_ACCESS, &ErrMsg))
-      throw ErrMsg;
-    if (!(data = (const char*) mFile->map(&ErrMsg)))
-      throw ErrMsg;
+    if (mFile->open(member.getPath(), sys::MappedFile::READ_ACCESS, ErrMsg))
+      return true;
+    if (!(data = (const char*) mFile->map(ErrMsg)))
+      return true;
     fSize = mFile->size();
   }
 
@@ -246,8 +246,9 @@ Archive::writeMember(
         mFile->close();
         delete mFile;
       }
-      if (error)
-        *error = "Can't parse bytecode member: " + member.getPath().toString();
+      if (ErrMsg)
+        *ErrMsg = "Can't parse bytecode member: " + member.getPath().toString();
+      return true;
     }
   }
 
@@ -274,9 +275,9 @@ Archive::writeMember(
       data +=4;
       fSize -= 4;
     }
-    fSize = Compressor::compressToNewBuffer(data,fSize,output,error);
+    fSize = Compressor::compressToNewBuffer(data,fSize,output,ErrMsg);
     if (fSize == 0)
-      return false;
+      return true;
     data = output;
     if (member.isBytecode())
       hdrSize = -fSize-4;
@@ -320,7 +321,7 @@ Archive::writeMember(
     mFile->close();
     delete mFile;
   }
-  return true;
+  return false;
 }
 
 // Write out the LLVM symbol table as an archive member to the file.
@@ -380,7 +381,7 @@ Archive::writeSymbolTable(std::ofstream& ARFile) {
 // compressing each archive member.
 bool
 Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, bool Compress,
-                     std::string* error)
+                     std::string* ErrMsg)
 {
   // Make sure they haven't opened up the file, not loaded it,
   // but are now trying to write it which would wipe out the file.
@@ -389,8 +390,8 @@ Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, bool Compress,
 
   // Create a temporary file to store the archive in
   sys::Path TmpArchive = archPath;
-  if (TmpArchive.createTemporaryFileOnDisk(error))
-    return false;
+  if (TmpArchive.createTemporaryFileOnDisk(ErrMsg))
+    return true;
 
   // Make sure the temporary gets removed if we crash
   sys::RemoveFileOnSignal(TmpArchive);
@@ -404,9 +405,9 @@ Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, bool Compress,
   if (!ArchiveFile.is_open() || ArchiveFile.bad()) {
     if (TmpArchive.exists())
       TmpArchive.eraseFromDisk();
-    if (error)
-      *error = "Error opening archive file: " + archPath.toString();
-    return false;
+    if (ErrMsg)
+      *ErrMsg = "Error opening archive file: " + archPath.toString();
+    return true;
   }
 
   // If we're creating a symbol table, reset it now
@@ -421,12 +422,12 @@ Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, bool Compress,
   // Loop over all member files, and write them out. Note that this also
   // builds the symbol table, symTab.
   for (MembersList::iterator I = begin(), E = end(); I != E; ++I) {
-    if (!writeMember(*I, ArchiveFile, CreateSymbolTable,
-                     TruncateNames, Compress, error)) {
+    if (writeMember(*I, ArchiveFile, CreateSymbolTable,
+                     TruncateNames, Compress, ErrMsg)) {
       if (TmpArchive.exists())
         TmpArchive.eraseFromDisk();
       ArchiveFile.close();
-      return false;
+      return true;
     }
   }
 
@@ -443,27 +444,26 @@ Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, bool Compress,
 
     // Map in the archive we just wrote.
     sys::MappedFile arch;
-    std::string ErrMsg;
-    if (arch.open(TmpArchive, sys::MappedFile::READ_ACCESS, &ErrMsg))
-      throw ErrMsg;
+    if (arch.open(TmpArchive, sys::MappedFile::READ_ACCESS, ErrMsg))
+      return true;
     const char* base;
-    if (!(base = (const char*) arch.map(&ErrMsg)))
-      throw ErrMsg;
+    if (!(base = (const char*) arch.map(ErrMsg)))
+      return true;
 
     // Open another temporary file in order to avoid invalidating the 
     // mmapped data
     sys::Path FinalFilePath = archPath;
-    if (FinalFilePath.createTemporaryFileOnDisk(error))
-      return false;
+    if (FinalFilePath.createTemporaryFileOnDisk(ErrMsg))
+      return true;
     sys::RemoveFileOnSignal(FinalFilePath);
 
     std::ofstream FinalFile(FinalFilePath.c_str(), io_mode);
     if (!FinalFile.is_open() || FinalFile.bad()) {
       if (TmpArchive.exists())
         TmpArchive.eraseFromDisk();
-      if (error)
-        *error = "Error opening archive file: " + FinalFilePath.toString();
-      return false;
+      if (ErrMsg)
+        *ErrMsg = "Error opening archive file: " + FinalFilePath.toString();
+      return true;
     }
 
     // Write the file magic number
@@ -475,11 +475,11 @@ Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, bool Compress,
     // compatibility with other ar(1) implementations as well as allowing the
     // archive to store both native .o and LLVM .bc files, both indexed.
     if (foreignST) {
-      if (!writeMember(*foreignST, FinalFile, false, false, false, error)) {
+      if (writeMember(*foreignST, FinalFile, false, false, false, ErrMsg)) {
         FinalFile.close();
         if (TmpArchive.exists())
           TmpArchive.eraseFromDisk();
-        return false;
+        return true;
       }
     }
 
@@ -496,8 +496,8 @@ Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, bool Compress,
     arch.close();
     
     // Move the final file over top of TmpArchive
-    if (FinalFilePath.renamePathOnDisk(TmpArchive, error))
-      return false;
+    if (FinalFilePath.renamePathOnDisk(TmpArchive, ErrMsg))
+      return true;
   }
   
   // Before we replace the actual archive, we need to forget all the
@@ -505,8 +505,8 @@ Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, bool Compress,
   // this because we cannot replace an open file on Windows.
   cleanUpMemory();
   
-  if (TmpArchive.renamePathOnDisk(archPath, error))
-    return false;
+  if (TmpArchive.renamePathOnDisk(archPath, ErrMsg))
+    return true;
 
-  return true;
+  return false;
 }
diff --git a/tools/llvm-ar/llvm-ar.cpp b/tools/llvm-ar/llvm-ar.cpp
index f266e1f3a57..55a60a331f4 100644
--- a/tools/llvm-ar/llvm-ar.cpp
+++ b/tools/llvm-ar/llvm-ar.cpp
@@ -586,7 +586,8 @@ doQuickAppend(std::string* ErrMsg) {
   // Append them quickly.
   for (std::set<sys::Path>::iterator PI = Paths.begin(), PE = Paths.end();
        PI != PE; ++PI) {
-    TheArchive->addFileBefore(*PI,TheArchive->end());
+    if (TheArchive->addFileBefore(*PI,TheArchive->end(),ErrMsg))
+      return true;
   }
 
   // We're done editting, reconstruct the archive.
@@ -647,15 +648,17 @@ doReplaceOrInsert(std::string* ErrMsg) {
       sys::FileStatus si;
       std::string Err;
       if (found->getFileStatus(si, &Err))
-        throw Err;
+        return true;
       if (si.isDir) {
         if (OnlyUpdate) {
           // Replace the item only if it is newer.
           if (si.modTime > I->getModTime())
-            I->replaceWith(*found);
+            if (I->replaceWith(*found, ErrMsg))
+              return true;
         } else {
           // Replace the item regardless of time stamp
-          I->replaceWith(*found);
+          if (I->replaceWith(*found, ErrMsg))
+            return true;
         }
       } else {
         // We purposefully ignore directories.
@@ -679,7 +682,8 @@ doReplaceOrInsert(std::string* ErrMsg) {
   if (!remaining.empty()) {
     for (std::set<sys::Path>::iterator PI = remaining.begin(),
          PE = remaining.end(); PI != PE; ++PI) {
-      TheArchive->addFileBefore(*PI,insert_spot);
+      if (TheArchive->addFileBefore(*PI,insert_spot, ErrMsg))
+        return true;
     }
   }