/// LinkInFile - opens a bitcode file and links in all objects which
/// provide symbols that are currently undefined.
///
/// Inputs:
/// File - The pathname of the bitcode file.
///
/// Outputs:
/// ErrorMessage - A C++ string detailing what error occurred, if any.
///
/// Return Value:
/// TRUE - An error occurred.
/// FALSE - No errors.
///
bool Linker::LinkInFile(const sys::Path &File, bool &is_native) {
is_native = false;
// Check for a file of name "-", which means "read standard input"
if (File.toString() == "-") {
std::auto_ptr<Module> M;
if (MemoryBuffer *Buffer = MemoryBuffer::getSTDIN()) {
M.reset(ParseBitcodeFile(Buffer, Context, &Error));
delete Buffer;
if (M.get())
if (!LinkInModule(M.get(), &Error))
return false;
} else
Error = "standard input is empty";
return error("Cannot link stdin: " + Error);
}
// Make sure we can at least read the file
if (!File.canRead())
return error("Cannot find linker input '" + File.toString() + "'");
// If its an archive, try to link it in
std::string Magic;
File.getMagicNumber(Magic, 64);
switch (sys::IdentifyFileType(Magic.c_str(), 64)) {
default: llvm_unreachable("Bad file type identification");
case sys::Unknown_FileType:
return warning("Ignoring file '" + File.toString() +
"' because does not contain bitcode.");
case sys::Archive_FileType:
// A user may specify an ar archive without -l, perhaps because it
// is not installed as a library. Detect that and link the archive.
verbose("Linking archive file '" + File.toString() + "'");
if (LinkInArchive(File, is_native))
return true;
break;
case sys::Bitcode_FileType: {
verbose("Linking bitcode file '" + File.toString() + "'");
std::auto_ptr<Module> M(LoadObject(File));
if (M.get() == 0)
return error("Cannot load file '" + File.toString() + "': " + Error);
if (LinkInModule(M.get(), &Error))
return error("Cannot link file '" + File.toString() + "': " + Error);
verbose("Linked in file '" + File.toString() + "'");
break;
}
case sys::ELF_Relocatable_FileType:
case sys::ELF_SharedObject_FileType:
case sys::Mach_O_Object_FileType:
case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
case sys::COFF_FileType:
is_native = true;
break;
}
return false;
}
/// LinkInFile - opens a bitcode file and links in all objects which
/// provide symbols that are currently undefined.
///
/// Inputs:
/// File - The pathname of the bitcode file.
///
/// Outputs:
/// ErrorMessage - A C++ string detailing what error occurred, if any.
///
/// Return Value:
/// TRUE - An error occurred.
/// FALSE - No errors.
///
bool Linker::LinkInFile(const sys::Path &File, bool &is_native) {
is_native = false;
// Check for a file of name "-", which means "read standard input"
if (File.str() == "-") {
std::auto_ptr<Module> M;
OwningPtr<MemoryBuffer> Buffer;
error_code ec;
if (!(ec = MemoryBuffer::getSTDIN(Buffer))) {
if (!Buffer->getBufferSize()) {
Error = "standard input is empty";
} else {
M.reset(ParseBitcodeFile(Buffer.get(), Context, &Error));
if (M.get())
if (!LinkInModule(M.get(), &Error))
return false;
}
}
return error("Cannot link stdin: " + ec.message());
}
// Determine what variety of file it is.
std::string Magic;
if (!File.getMagicNumber(Magic, 512))
return error("Cannot find linker input '" + File.str() + "'");
switch (sys::IdentifyFileType(Magic.c_str(), 512)) {
default: llvm_unreachable("Bad file type identification");
case sys::Unknown_FileType:
return warning("Ignoring file '" + File.str() +
"' because does not contain bitcode.");
case sys::Archive_FileType:
// A user may specify an ar archive without -l, perhaps because it
// is not installed as a library. Detect that and link the archive.
if (LinkInArchive(File, is_native))
return true;
break;
case sys::Bitcode_FileType: {
verbose("Linking bitcode file '" + File.str() + "'");
std::auto_ptr<Module> M(LoadObject(File));
if (M.get() == 0)
return error("Cannot load file '" + File.str() + "': " + Error);
if (LinkInModule(M.get(), &Error))
return error("Cannot link file '" + File.str() + "': " + Error);
verbose("Linked in file '" + File.str() + "'");
break;
}
case sys::ELF_Relocatable_FileType:
case sys::ELF_SharedObject_FileType:
case sys::Mach_O_Object_FileType:
case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
case sys::COFF_FileType:
is_native = true;
break;
}
return false;
}
