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//===- 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/Linker.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/IR/AutoUpgrade.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/DiagnosticPrinter.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Verifier.h"
#include "llvm/IRReader/IRReader.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.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);
static cl::opt<bool>
SuppressWarnings("suppress-warnings", cl::desc("Suppress all linking warnings"),
cl::init(false));
static cl::opt<bool> PreserveBitcodeUseListOrder(
"preserve-bc-uselistorder",
cl::desc("Preserve use-list order when writing LLVM bitcode."),
cl::init(true), cl::Hidden);
static cl::opt<bool> PreserveAssemblyUseListOrder(
"preserve-ll-uselistorder",
cl::desc("Preserve use-list order when writing LLVM assembly."),
cl::init(false), cl::Hidden);
// 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 std::unique_ptr<Module>
loadFile(const char *argv0, const std::string &FN, LLVMContext &Context) {
SMDiagnostic Err;
if (Verbose) errs() << "Loading '" << FN << "'\n";
std::unique_ptr<Module> Result = getLazyIRFileModule(FN, Err, Context);
if (!Result)
Err.print(argv0, errs());
Result->materializeMetadata();
UpgradeDebugInfo(*Result);
return Result;
}
static void diagnosticHandler(const DiagnosticInfo &DI) {
unsigned Severity = DI.getSeverity();
switch (Severity) {
case DS_Error:
errs() << "ERROR: ";
break;
case DS_Warning:
if (SuppressWarnings)
return;
errs() << "WARNING: ";
break;
case DS_Remark:
case DS_Note:
llvm_unreachable("Only expecting warnings and errors");
}
DiagnosticPrinterRawOStream DP(errs());
DI.print(DP);
errs() << '\n';
}
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");
auto Composite = make_unique<Module>("llvm-link", Context);
Linker L(Composite.get(), diagnosticHandler);
for (unsigned i = 0; i < InputFilenames.size(); ++i) {
std::unique_ptr<Module> M = loadFile(argv[0], InputFilenames[i], Context);
if (!M.get()) {
errs() << argv[0] << ": error loading file '" <<InputFilenames[i]<< "'\n";
return 1;
}
if (verifyModule(*M, &errs())) {
errs() << argv[0] << ": " << InputFilenames[i]
<< ": error: input module is broken!\n";
return 1;
}
if (Verbose) errs() << "Linking in '" << InputFilenames[i] << "'\n";
if (L.linkInModule(M.get()))
return 1;
}
if (DumpAsm) errs() << "Here's the assembly:\n" << *Composite;
std::error_code EC;
tool_output_file Out(OutputFilename, EC, sys::fs::F_None);
if (EC) {
errs() << EC.message() << '\n';
return 1;
}
if (verifyModule(*Composite, &errs())) {
errs() << argv[0] << ": error: linked module is broken!\n";
return 1;
}
if (Verbose) errs() << "Writing bitcode...\n";
if (OutputAssembly) {
Composite->print(Out.os(), nullptr, PreserveAssemblyUseListOrder);
} else if (Force || !CheckBitcodeOutputToConsole(Out.os(), true))
WriteBitcodeToFile(Composite.get(), Out.os(), PreserveBitcodeUseListOrder);
// Declare success.
Out.keep();
return 0;
}
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