forked from OSchip/llvm-project
193 lines
5.8 KiB
C++
193 lines
5.8 KiB
C++
//===-- llvm-lto: a simple command-line program to link modules with LTO --===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This program takes in a list of bitcode files, links them, performs link-time
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// optimization, and outputs an object file.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/StringSet.h"
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#include "llvm/CodeGen/CommandFlags.h"
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#include "llvm/LTO/LTOCodeGenerator.h"
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#include "llvm/LTO/LTOModule.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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static cl::opt<bool>
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DisableOpt("disable-opt", cl::init(false),
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cl::desc("Do not run any optimization passes"));
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static cl::opt<bool>
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DisableInline("disable-inlining", cl::init(false),
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cl::desc("Do not run the inliner pass"));
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static cl::opt<bool>
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DisableGVNLoadPRE("disable-gvn-loadpre", cl::init(false),
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cl::desc("Do not run the GVN load PRE pass"));
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static cl::list<std::string>
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InputFilenames(cl::Positional, cl::OneOrMore,
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cl::desc("<input bitcode files>"));
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static cl::opt<std::string>
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OutputFilename("o", cl::init(""),
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cl::desc("Override output filename"),
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cl::value_desc("filename"));
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static cl::list<std::string>
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ExportedSymbols("exported-symbol",
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cl::desc("Symbol to export from the resulting object file"),
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cl::ZeroOrMore);
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static cl::list<std::string>
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DSOSymbols("dso-symbol",
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cl::desc("Symbol to put in the symtab in the resulting dso"),
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cl::ZeroOrMore);
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namespace {
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struct ModuleInfo {
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std::vector<bool> CanBeHidden;
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};
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}
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int main(int argc, char **argv) {
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// Print a stack trace if we signal out.
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sys::PrintStackTraceOnErrorSignal();
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PrettyStackTraceProgram X(argc, argv);
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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cl::ParseCommandLineOptions(argc, argv, "llvm LTO linker\n");
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// Initialize the configured targets.
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InitializeAllTargets();
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InitializeAllTargetMCs();
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InitializeAllAsmPrinters();
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InitializeAllAsmParsers();
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// set up the TargetOptions for the machine
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TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
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unsigned BaseArg = 0;
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LTOCodeGenerator CodeGen;
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switch (RelocModel) {
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case Reloc::Static:
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CodeGen.setCodePICModel(LTO_CODEGEN_PIC_MODEL_STATIC);
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break;
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case Reloc::PIC_:
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CodeGen.setCodePICModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC);
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break;
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case Reloc::DynamicNoPIC:
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CodeGen.setCodePICModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC);
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break;
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default:
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CodeGen.setCodePICModel(LTO_CODEGEN_PIC_MODEL_DEFAULT);
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}
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CodeGen.setDebugInfo(LTO_DEBUG_MODEL_DWARF);
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CodeGen.setTargetOptions(Options);
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llvm::StringSet<llvm::MallocAllocator> DSOSymbolsSet;
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for (unsigned i = 0; i < DSOSymbols.size(); ++i)
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DSOSymbolsSet.insert(DSOSymbols[i]);
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std::vector<std::string> KeptDSOSyms;
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for (unsigned i = BaseArg; i < InputFilenames.size(); ++i) {
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std::string error;
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std::unique_ptr<LTOModule> Module(
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LTOModule::makeLTOModule(InputFilenames[i].c_str(), Options, error));
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if (!error.empty()) {
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errs() << argv[0] << ": error loading file '" << InputFilenames[i]
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<< "': " << error << "\n";
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return 1;
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}
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if (!CodeGen.addModule(Module.get(), error)) {
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errs() << argv[0] << ": error adding file '" << InputFilenames[i]
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<< "': " << error << "\n";
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return 1;
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}
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unsigned NumSyms = Module->getSymbolCount();
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for (unsigned I = 0; I < NumSyms; ++I) {
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StringRef Name = Module->getSymbolName(I);
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if (!DSOSymbolsSet.count(Name))
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continue;
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lto_symbol_attributes Attrs = Module->getSymbolAttributes(I);
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unsigned Scope = Attrs & LTO_SYMBOL_SCOPE_MASK;
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if (Scope != LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN)
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KeptDSOSyms.push_back(Name);
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}
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}
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// Add all the exported symbols to the table of symbols to preserve.
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for (unsigned i = 0; i < ExportedSymbols.size(); ++i)
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CodeGen.addMustPreserveSymbol(ExportedSymbols[i].c_str());
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// Add all the dso symbols to the table of symbols to expose.
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for (unsigned i = 0; i < KeptDSOSyms.size(); ++i)
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CodeGen.addMustPreserveSymbol(KeptDSOSyms[i].c_str());
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std::string attrs;
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for (unsigned i = 0; i < MAttrs.size(); ++i) {
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if (i > 0)
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attrs.append(",");
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attrs.append(MAttrs[i]);
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}
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if (!attrs.empty())
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CodeGen.setAttr(attrs.c_str());
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if (!OutputFilename.empty()) {
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size_t len = 0;
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std::string ErrorInfo;
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const void *Code = CodeGen.compile(&len, DisableOpt, DisableInline,
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DisableGVNLoadPRE, ErrorInfo);
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if (!Code) {
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errs() << argv[0]
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<< ": error compiling the code: " << ErrorInfo << "\n";
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return 1;
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}
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raw_fd_ostream FileStream(OutputFilename.c_str(), ErrorInfo,
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sys::fs::F_None);
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if (!ErrorInfo.empty()) {
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errs() << argv[0] << ": error opening the file '" << OutputFilename
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<< "': " << ErrorInfo << "\n";
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return 1;
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}
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FileStream.write(reinterpret_cast<const char *>(Code), len);
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} else {
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std::string ErrorInfo;
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const char *OutputName = nullptr;
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if (!CodeGen.compile_to_file(&OutputName, DisableOpt, DisableInline,
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DisableGVNLoadPRE, ErrorInfo)) {
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errs() << argv[0]
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<< ": error compiling the code: " << ErrorInfo
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<< "\n";
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return 1;
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}
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outs() << "Wrote native object file '" << OutputName << "'\n";
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}
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return 0;
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}
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