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llvm-mirror/tools/llvm-link/llvm-link.cpp
Chandler Carruth 5bf5043e5b Split out the IRReader header and the utility functions it provides into
its own library. These functions are bridging between the bitcode reader
and the ll parser which are in different libraries. Previously we didn't
have any good library to do this, and instead played fast and loose with
a "header only" set of interfaces in the Support library. This really
doesn't work well as evidenced by the recent attempt to add timing logic
to the these routines.

As part of this, make them normal functions rather than weird inline
functions, and sink the implementation into the library. Also clean up
the header to be nice and minimal.

This requires updating lots of build system dependencies to specify that
the IRReader library is needed, and several source files to not
implicitly rely upon the header file to transitively include all manner
of other headers.

If you are using IRReader.h, this commit will break you (the header
moved) and you'll need to also update your library usage to include
'irreader'. I will commit the corresponding change to Clang momentarily.

llvm-svn: 177971
2013-03-26 02:25:37 +00:00

141 lines
4.4 KiB
C++

//===- llvm-link.cpp - Low-level LLVM linker ------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This utility may be invoked in the following manner:
// llvm-link a.bc b.bc c.bc -o x.bc
//
//===----------------------------------------------------------------------===//
#include "llvm/Linker.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IRReader/IRReader.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/SystemUtils.h"
#include "llvm/Support/ToolOutputFile.h"
#include <memory>
using namespace llvm;
static cl::list<std::string>
InputFilenames(cl::Positional, cl::OneOrMore,
cl::desc("<input bitcode files>"));
static cl::opt<std::string>
OutputFilename("o", cl::desc("Override output filename"), cl::init("-"),
cl::value_desc("filename"));
static cl::opt<bool>
Force("f", cl::desc("Enable binary output on terminals"));
static cl::opt<bool>
OutputAssembly("S",
cl::desc("Write output as LLVM assembly"), cl::Hidden);
static cl::opt<bool>
Verbose("v", cl::desc("Print information about actions taken"));
static cl::opt<bool>
DumpAsm("d", cl::desc("Print assembly as linked"), cl::Hidden);
// LoadFile - Read the specified bitcode file in and return it. This routine
// searches the link path for the specified file to try to find it...
//
static inline std::auto_ptr<Module> LoadFile(const char *argv0,
const std::string &FN,
LLVMContext& Context) {
sys::Path Filename;
if (!Filename.set(FN)) {
errs() << "Invalid file name: '" << FN << "'\n";
return std::auto_ptr<Module>();
}
SMDiagnostic Err;
if (Verbose) errs() << "Loading '" << Filename.c_str() << "'\n";
Module* Result = 0;
const std::string &FNStr = Filename.str();
Result = ParseIRFile(FNStr, Err, Context);
if (Result) return std::auto_ptr<Module>(Result); // Load successful!
Err.print(argv0, errs());
return std::auto_ptr<Module>();
}
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
LLVMContext &Context = getGlobalContext();
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, "llvm linker\n");
unsigned BaseArg = 0;
std::string ErrorMessage;
std::auto_ptr<Module> Composite(LoadFile(argv[0],
InputFilenames[BaseArg], Context));
if (Composite.get() == 0) {
errs() << argv[0] << ": error loading file '"
<< InputFilenames[BaseArg] << "'\n";
return 1;
}
for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
std::auto_ptr<Module> M(LoadFile(argv[0],
InputFilenames[i], Context));
if (M.get() == 0) {
errs() << argv[0] << ": error loading file '" <<InputFilenames[i]<< "'\n";
return 1;
}
if (Verbose) errs() << "Linking in '" << InputFilenames[i] << "'\n";
if (Linker::LinkModules(Composite.get(), M.get(), Linker::DestroySource,
&ErrorMessage)) {
errs() << argv[0] << ": link error in '" << InputFilenames[i]
<< "': " << ErrorMessage << "\n";
return 1;
}
}
if (DumpAsm) errs() << "Here's the assembly:\n" << *Composite;
std::string ErrorInfo;
tool_output_file Out(OutputFilename.c_str(), ErrorInfo,
raw_fd_ostream::F_Binary);
if (!ErrorInfo.empty()) {
errs() << ErrorInfo << '\n';
return 1;
}
if (verifyModule(*Composite)) {
errs() << argv[0] << ": linked module is broken!\n";
return 1;
}
if (Verbose) errs() << "Writing bitcode...\n";
if (OutputAssembly) {
Out.os() << *Composite;
} else if (Force || !CheckBitcodeOutputToConsole(Out.os(), true))
WriteBitcodeToFile(Composite.get(), Out.os());
// Declare success.
Out.keep();
return 0;
}