#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/Assembly/PrintModulePass.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/IRReader.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/SystemUtils.h"
#include "llvm/System/Signals.h"
#include <memory>
using namespace llvm;
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input bitcode file>"),
cl::init("-"), cl::value_desc("filename"));
static cl::opt<std::string>
OutputFilename("o", cl::desc("Specify output filename"),
cl::value_desc("filename"), cl::init("-"));
static cl::opt<bool>
Force("f", cl::desc("Enable binary output on terminals"));
static cl::opt<bool>
DeleteFn("delete", cl::desc("Delete specified Globals from Module"));
static cl::opt<bool>
Relink("relink",
cl::desc("Turn external linkage for callees of function to delete"));
static cl::list<std::string>
ExtractFuncs("func", cl::desc("Specify function to extract"),
cl::ZeroOrMore, cl::value_desc("function"));
static cl::list<std::string>
ExtractGlobals("glob", cl::desc("Specify global to extract"),
cl::ZeroOrMore, cl::value_desc("global"));
static cl::opt<bool>
OutputAssembly("S",
cl::desc("Write output as LLVM assembly"), cl::Hidden);
int main(int argc, char **argv) {
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
LLVMContext &Context = getGlobalContext();
llvm_shutdown_obj Y; cl::ParseCommandLineOptions(argc, argv, "llvm extractor\n");
SMDiagnostic Err;
std::auto_ptr<Module> M;
M.reset(ParseIRFile(InputFilename, Err, Context));
if (M.get() == 0) {
Err.Print(argv[0], errs());
return 1;
}
std::vector<GlobalValue *> GVs;
for (size_t i = 0, e = ExtractGlobals.size(); i != e; ++i) {
GlobalValue *GV = M.get()->getNamedGlobal(ExtractGlobals[i]);
if (!GV) {
errs() << argv[0] << ": program doesn't contain global named '"
<< ExtractGlobals[i] << "'!\n";
return 1;
}
GVs.push_back(GV);
}
for (size_t i = 0, e = ExtractFuncs.size(); i != e; ++i) {
GlobalValue *GV = M.get()->getFunction(ExtractFuncs[i]);
if (!GV) {
errs() << argv[0] << ": program doesn't contain function named '"
<< ExtractFuncs[i] << "'!\n";
return 1;
}
GVs.push_back(GV);
}
PassManager Passes;
Passes.add(new TargetData(M.get()));
Passes.add(createGVExtractionPass(GVs, DeleteFn, Relink));
if (!DeleteFn)
Passes.add(createGlobalDCEPass()); Passes.add(createDeadTypeEliminationPass()); Passes.add(createStripDeadPrototypesPass());
sys::RemoveFileOnSignal(sys::Path(OutputFilename));
std::string ErrorInfo;
raw_fd_ostream Out(OutputFilename.c_str(), ErrorInfo,
raw_fd_ostream::F_Binary);
if (!ErrorInfo.empty()) {
errs() << ErrorInfo << '\n';
return 1;
}
if (OutputAssembly)
Passes.add(createPrintModulePass(&Out));
else if (Force || !CheckBitcodeOutputToConsole(Out, true))
Passes.add(createBitcodeWriterPass(Out));
Passes.run(*M.get());
return 0;
}