//===----------------------------------------------------------------------===//
#include "llvm/Config/config.h" // plugin-api.h requires HAVE_STDINT_H
-#include "llvm-c/lto.h"
+#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/StringSet.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/CodeGen/Analysis.h"
#include "llvm/CodeGen/CommandFlags.h"
-#include "llvm/LTO/LTOCodeGenerator.h"
-#include "llvm/LTO/LTOModule.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/Verifier.h"
+#include "llvm/Linker/Linker.h"
+#include "llvm/MC/SubtargetFeature.h"
+#include "llvm/Object/IRObjectFile.h"
+#include "llvm/PassManager.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/Host.h"
#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
+#include "llvm/Target/TargetLibraryInfo.h"
+#include "llvm/Transforms/IPO.h"
+#include "llvm/Transforms/IPO/PassManagerBuilder.h"
+#include "llvm/Transforms/Utils/GlobalStatus.h"
+#include "llvm/Transforms/Utils/ModuleUtils.h"
+#include "llvm/Transforms/Utils/ValueMapper.h"
#include <list>
#include <plugin-api.h>
#include <system_error>
abort();
}
+static ld_plugin_get_input_file get_input_file = nullptr;
+static ld_plugin_release_input_file release_input_file = nullptr;
static ld_plugin_add_symbols add_symbols = nullptr;
static ld_plugin_get_symbols get_symbols = nullptr;
static ld_plugin_add_input_file add_input_file = nullptr;
static ld_plugin_set_extra_library_path set_extra_library_path = nullptr;
static ld_plugin_get_view get_view = nullptr;
static ld_plugin_message message = discard_message;
-static lto_codegen_model output_type = LTO_CODEGEN_PIC_MODEL_STATIC;
+static Reloc::Model RelocationModel = Reloc::Default;
static std::string output_name = "";
static std::list<claimed_file> Modules;
static std::vector<std::string> Cleanup;
-static LTOCodeGenerator *CodeGen = nullptr;
-static StringSet<> CannotBeHidden;
static llvm::TargetOptions TargetOpts;
namespace options {
}
} else {
// Save this option to pass to the code generator.
+ // ParseCommandLineOptions() expects argv[0] to be program name. Lazily
+ // add that.
+ if (extra.empty())
+ extra.push_back("LLVMgold");
+
extra.push_back(opt_);
}
}
case LDPO_REL: // .o
case LDPO_DYN: // .so
case LDPO_PIE: // position independent executable
- output_type = LTO_CODEGEN_PIC_MODEL_DYNAMIC;
+ RelocationModel = Reloc::PIC_;
break;
case LDPO_EXEC: // .exe
- output_type = LTO_CODEGEN_PIC_MODEL_STATIC;
+ RelocationModel = Reloc::Static;
break;
default:
message(LDPL_ERROR, "Unknown output file type %d", tv->tv_u.tv_val);
if (callback(cleanup_hook) != LDPS_OK)
return LDPS_ERR;
} break;
+ case LDPT_GET_INPUT_FILE:
+ get_input_file = tv->tv_u.tv_get_input_file;
+ break;
+ case LDPT_RELEASE_INPUT_FILE:
+ release_input_file = tv->tv_u.tv_release_input_file;
+ break;
case LDPT_ADD_SYMBOLS:
add_symbols = tv->tv_u.tv_add_symbols;
break;
if (!RegisteredAllSymbolsRead)
return LDPS_OK;
- CodeGen = new LTOCodeGenerator();
-
- // Pass through extra options to the code generator.
- if (!options::extra.empty()) {
- for (const char *Opt : options::extra)
- CodeGen->setCodeGenDebugOptions(Opt);
+ if (!get_input_file) {
+ message(LDPL_ERROR, "get_input_file not passed to LLVMgold.");
+ return LDPS_ERR;
}
-
- CodeGen->parseCodeGenDebugOptions();
- if (MAttrs.size()) {
- std::string Attrs;
- for (unsigned I = 0; I < MAttrs.size(); ++I) {
- if (I > 0)
- Attrs.append(",");
- Attrs.append(MAttrs[I]);
- }
- CodeGen->setAttr(Attrs.c_str());
+ if (!release_input_file) {
+ message(LDPL_ERROR, "relesase_input_file not passed to LLVMgold.");
+ return LDPS_ERR;
}
- TargetOpts = InitTargetOptionsFromCodeGenFlags();
- CodeGen->setTargetOptions(TargetOpts);
-
return LDPS_OK;
}
+static const GlobalObject *getBaseObject(const GlobalValue &GV) {
+ if (auto *GA = dyn_cast<GlobalAlias>(&GV))
+ return GA->getBaseObject();
+ return cast<GlobalObject>(&GV);
+}
+
/// Called by gold to see whether this file is one that our plugin can handle.
/// We'll try to open it and register all the symbols with add_symbol if
/// possible.
static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
int *claimed) {
- const void *view;
- std::unique_ptr<MemoryBuffer> buffer;
+ LLVMContext Context;
+ MemoryBufferRef BufferRef;
+ std::unique_ptr<MemoryBuffer> Buffer;
if (get_view) {
+ const void *view;
if (get_view(file->handle, &view) != LDPS_OK) {
message(LDPL_ERROR, "Failed to get a view of %s", file->name);
return LDPS_ERR;
}
+ BufferRef = MemoryBufferRef(StringRef((const char *)view, file->filesize), "");
} else {
int64_t offset = 0;
// Gold has found what might be IR part-way inside of a file, such as
message(LDPL_ERROR, EC.message().c_str());
return LDPS_ERR;
}
- buffer = std::move(BufferOrErr.get());
- view = buffer->getBufferStart();
+ Buffer = std::move(BufferOrErr.get());
+ BufferRef = Buffer->getMemBufferRef();
}
- if (!LTOModule::isBitcodeFile(view, file->filesize))
+ ErrorOr<std::unique_ptr<object::IRObjectFile>> ObjOrErr =
+ object::IRObjectFile::createIRObjectFile(BufferRef, Context);
+ std::error_code EC = ObjOrErr.getError();
+ if (EC == BitcodeError::InvalidBitcodeSignature ||
+ EC == object::object_error::invalid_file_type ||
+ EC == object::object_error::bitcode_section_not_found)
return LDPS_OK;
*claimed = 1;
- std::string Error;
- LTOModule *M =
- LTOModule::createFromBuffer(view, file->filesize, TargetOpts, Error);
- if (!M) {
+ if (EC) {
message(LDPL_ERROR, "LLVM gold plugin has failed to create LTO module: %s",
- Error.c_str());
+ EC.message().c_str());
return LDPS_ERR;
}
+ std::unique_ptr<object::IRObjectFile> Obj = std::move(*ObjOrErr);
Modules.resize(Modules.size() + 1);
claimed_file &cf = Modules.back();
- if (!options::triple.empty())
- M->setTargetTriple(options::triple.c_str());
-
cf.handle = file->handle;
- unsigned sym_count = M->getSymbolCount();
- cf.syms.reserve(sym_count);
- for (unsigned i = 0; i != sym_count; ++i) {
- lto_symbol_attributes attrs = M->getSymbolAttributes(i);
- if ((attrs & LTO_SYMBOL_SCOPE_MASK) == LTO_SYMBOL_SCOPE_INTERNAL)
+ for (auto &Sym : Obj->symbols()) {
+ uint32_t Symflags = Sym.getFlags();
+ if (!(Symflags & object::BasicSymbolRef::SF_Global))
+ continue;
+
+ if (Symflags & object::BasicSymbolRef::SF_FormatSpecific)
continue;
cf.syms.push_back(ld_plugin_symbol());
ld_plugin_symbol &sym = cf.syms.back();
- sym.name = strdup(M->getSymbolName(i));
sym.version = nullptr;
- int scope = attrs & LTO_SYMBOL_SCOPE_MASK;
- bool CanBeHidden = scope == LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN;
- if (!CanBeHidden)
- CannotBeHidden.insert(sym.name);
- switch (scope) {
- case LTO_SYMBOL_SCOPE_HIDDEN:
+ SmallString<64> Name;
+ {
+ raw_svector_ostream OS(Name);
+ Sym.printName(OS);
+ }
+ sym.name = strdup(Name.c_str());
+
+ const GlobalValue *GV = Obj->getSymbolGV(Sym.getRawDataRefImpl());
+
+ sym.visibility = LDPV_DEFAULT;
+ if (GV) {
+ switch (GV->getVisibility()) {
+ case GlobalValue::DefaultVisibility:
+ sym.visibility = LDPV_DEFAULT;
+ break;
+ case GlobalValue::HiddenVisibility:
sym.visibility = LDPV_HIDDEN;
break;
- case LTO_SYMBOL_SCOPE_PROTECTED:
+ case GlobalValue::ProtectedVisibility:
sym.visibility = LDPV_PROTECTED;
break;
- case 0: // extern
- case LTO_SYMBOL_SCOPE_DEFAULT:
- case LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN:
- sym.visibility = LDPV_DEFAULT;
- break;
- default:
- message(LDPL_ERROR, "Unknown scope attribute: %d", scope);
- return LDPS_ERR;
+ }
}
- int definition = attrs & LTO_SYMBOL_DEFINITION_MASK;
- sym.comdat_key = nullptr;
- switch (definition) {
- case LTO_SYMBOL_DEFINITION_REGULAR:
- sym.def = LDPK_DEF;
- break;
- case LTO_SYMBOL_DEFINITION_UNDEFINED:
- sym.def = LDPK_UNDEF;
- break;
- case LTO_SYMBOL_DEFINITION_TENTATIVE:
- sym.def = LDPK_COMMON;
- break;
- case LTO_SYMBOL_DEFINITION_WEAK:
- sym.comdat_key = sym.name;
- sym.def = LDPK_WEAKDEF;
- break;
- case LTO_SYMBOL_DEFINITION_WEAKUNDEF:
+ if (Symflags & object::BasicSymbolRef::SF_Undefined) {
+ sym.def = LDPK_UNDEF;
+ if (GV && GV->hasExternalWeakLinkage())
sym.def = LDPK_WEAKUNDEF;
- break;
- default:
- message(LDPL_ERROR, "Unknown definition attribute: %d", definition);
- return LDPS_ERR;
+ } else {
+ sym.def = LDPK_DEF;
+ if (GV) {
+ assert(!GV->hasExternalWeakLinkage() &&
+ !GV->hasAvailableExternallyLinkage() && "Not a declaration!");
+ if (GV->hasCommonLinkage())
+ sym.def = LDPK_COMMON;
+ else if (GV->isWeakForLinker())
+ sym.def = LDPK_WEAKDEF;
+ }
}
sym.size = 0;
+ sym.comdat_key = nullptr;
+ if (GV) {
+ const GlobalObject *Base = getBaseObject(*GV);
+ if (!Base)
+ message(LDPL_FATAL, "Unable to determine comdat of alias!");
+ const Comdat *C = Base->getComdat();
+ if (C)
+ sym.comdat_key = strdup(C->getName().str().c_str());
+ else if (Base->hasWeakLinkage() || Base->hasLinkOnceLinkage())
+ sym.comdat_key = strdup(sym.name);
+ }
sym.resolution = LDPR_UNKNOWN;
}
- cf.syms.reserve(cf.syms.size());
-
if (!cf.syms.empty()) {
if (add_symbols(cf.handle, cf.syms.size(), &cf.syms[0]) != LDPS_OK) {
message(LDPL_ERROR, "Unable to add symbols!");
}
}
- if (CodeGen) {
- std::string Error;
- if (!CodeGen->addModule(M, Error)) {
- message(LDPL_ERROR, "Error linking module: %s", Error.c_str());
- return LDPS_ERR;
+ return LDPS_OK;
+}
+
+static void keepGlobalValue(GlobalValue &GV,
+ std::vector<GlobalAlias *> &KeptAliases) {
+ assert(!GV.hasLocalLinkage());
+
+ if (auto *GA = dyn_cast<GlobalAlias>(&GV))
+ KeptAliases.push_back(GA);
+
+ switch (GV.getLinkage()) {
+ default:
+ break;
+ case GlobalValue::LinkOnceAnyLinkage:
+ GV.setLinkage(GlobalValue::WeakAnyLinkage);
+ break;
+ case GlobalValue::LinkOnceODRLinkage:
+ GV.setLinkage(GlobalValue::WeakODRLinkage);
+ break;
+ }
+
+ assert(!GV.isDiscardableIfUnused());
+}
+
+static void internalize(GlobalValue &GV) {
+ if (GV.isDeclarationForLinker())
+ return; // We get here if there is a matching asm definition.
+ if (!GV.hasLocalLinkage())
+ GV.setLinkage(GlobalValue::InternalLinkage);
+}
+
+static void drop(GlobalValue &GV) {
+ if (auto *F = dyn_cast<Function>(&GV)) {
+ F->deleteBody();
+ F->setComdat(nullptr); // Should deleteBody do this?
+ return;
+ }
+
+ if (auto *Var = dyn_cast<GlobalVariable>(&GV)) {
+ Var->setInitializer(nullptr);
+ Var->setLinkage(
+ GlobalValue::ExternalLinkage); // Should setInitializer do this?
+ Var->setComdat(nullptr); // and this?
+ return;
+ }
+
+ auto &Alias = cast<GlobalAlias>(GV);
+ Module &M = *Alias.getParent();
+ PointerType &Ty = *cast<PointerType>(Alias.getType());
+ GlobalValue::LinkageTypes L = Alias.getLinkage();
+ auto *Var =
+ new GlobalVariable(M, Ty.getElementType(), /*isConstant*/ false, L,
+ /*Initializer*/ nullptr);
+ Var->takeName(&Alias);
+ Alias.replaceAllUsesWith(Var);
+ Alias.eraseFromParent();
+}
+
+static const char *getResolutionName(ld_plugin_symbol_resolution R) {
+ switch (R) {
+ case LDPR_UNKNOWN:
+ return "UNKNOWN";
+ case LDPR_UNDEF:
+ return "UNDEF";
+ case LDPR_PREVAILING_DEF:
+ return "PREVAILING_DEF";
+ case LDPR_PREVAILING_DEF_IRONLY:
+ return "PREVAILING_DEF_IRONLY";
+ case LDPR_PREEMPTED_REG:
+ return "PREEMPTED_REG";
+ case LDPR_PREEMPTED_IR:
+ return "PREEMPTED_IR";
+ case LDPR_RESOLVED_IR:
+ return "RESOLVED_IR";
+ case LDPR_RESOLVED_EXEC:
+ return "RESOLVED_EXEC";
+ case LDPR_RESOLVED_DYN:
+ return "RESOLVED_DYN";
+ case LDPR_PREVAILING_DEF_IRONLY_EXP:
+ return "PREVAILING_DEF_IRONLY_EXP";
+ }
+ llvm_unreachable("Unknown resolution");
+}
+
+static GlobalObject *makeInternalReplacement(GlobalObject *GO) {
+ Module *M = GO->getParent();
+ GlobalObject *Ret;
+ if (auto *F = dyn_cast<Function>(GO)) {
+ if (F->isMaterializable()) {
+ if (F->materialize())
+ message(LDPL_FATAL, "LLVM gold plugin has failed to read a function");
+
}
+
+ auto *NewF = Function::Create(F->getFunctionType(), F->getLinkage(),
+ F->getName(), M);
+
+ ValueToValueMapTy VM;
+ Function::arg_iterator NewI = NewF->arg_begin();
+ for (auto &Arg : F->args()) {
+ NewI->setName(Arg.getName());
+ VM[&Arg] = NewI;
+ ++NewI;
+ }
+
+ NewF->getBasicBlockList().splice(NewF->end(), F->getBasicBlockList());
+ for (auto &BB : *NewF) {
+ for (auto &Inst : BB)
+ RemapInstruction(&Inst, VM, RF_IgnoreMissingEntries);
+ }
+
+ Ret = NewF;
+ F->deleteBody();
+ } else {
+ auto *Var = cast<GlobalVariable>(GO);
+ Ret = new GlobalVariable(
+ *M, Var->getType()->getElementType(), Var->isConstant(),
+ Var->getLinkage(), Var->getInitializer(), Var->getName(),
+ nullptr, Var->getThreadLocalMode(), Var->getType()->getAddressSpace(),
+ Var->isExternallyInitialized());
+ Var->setInitializer(nullptr);
}
+ Ret->copyAttributesFrom(GO);
+ Ret->setLinkage(GlobalValue::InternalLinkage);
+ Ret->setComdat(GO->getComdat());
- delete M;
+ return Ret;
+}
- return LDPS_OK;
+namespace {
+class LocalValueMaterializer : public ValueMaterializer {
+ DenseSet<GlobalValue *> &Dropped;
+
+public:
+ LocalValueMaterializer(DenseSet<GlobalValue *> &Dropped) : Dropped(Dropped) {}
+ Value *materializeValueFor(Value *V) override;
+};
}
-static bool mustPreserve(ld_plugin_symbol &Sym) {
- if (Sym.resolution == LDPR_PREVAILING_DEF)
- return true;
- if (Sym.resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)
- return CannotBeHidden.count(Sym.name);
- return false;
+Value *LocalValueMaterializer::materializeValueFor(Value *V) {
+ auto *GV = dyn_cast<GlobalValue>(V);
+ if (!GV)
+ return nullptr;
+ if (!Dropped.count(GV))
+ return nullptr;
+ assert(!isa<GlobalAlias>(GV) && "Found alias point to weak alias.");
+ return makeInternalReplacement(cast<GlobalObject>(GV));
+}
+
+static Constant *mapConstantToLocalCopy(Constant *C, ValueToValueMapTy &VM,
+ LocalValueMaterializer *Materializer) {
+ return MapValue(C, VM, RF_IgnoreMissingEntries, nullptr, Materializer);
+}
+
+static std::unique_ptr<Module>
+getModuleForFile(LLVMContext &Context, claimed_file &F, raw_fd_ostream *ApiFile,
+ StringSet<> &Internalize, StringSet<> &Maybe) {
+ ld_plugin_input_file File;
+ if (get_input_file(F.handle, &File) != LDPS_OK)
+ message(LDPL_FATAL, "Failed to get file information");
+
+ if (get_symbols(F.handle, F.syms.size(), &F.syms[0]) != LDPS_OK)
+ message(LDPL_FATAL, "Failed to get symbol information");
+
+ const void *View;
+ if (get_view(F.handle, &View) != LDPS_OK)
+ message(LDPL_FATAL, "Failed to get a view of file");
+
+ llvm::ErrorOr<MemoryBufferRef> MBOrErr =
+ object::IRObjectFile::findBitcodeInMemBuffer(
+ MemoryBufferRef(StringRef((const char *)View, File.filesize), ""));
+ if (std::error_code EC = MBOrErr.getError())
+ message(LDPL_FATAL, "Could not read bitcode from file : %s",
+ EC.message().c_str());
+
+ std::unique_ptr<MemoryBuffer> Buffer =
+ MemoryBuffer::getMemBuffer(MBOrErr->getBuffer(), "", false);
+
+ if (release_input_file(F.handle) != LDPS_OK)
+ message(LDPL_FATAL, "Failed to release file information");
+
+ ErrorOr<Module *> MOrErr = getLazyBitcodeModule(std::move(Buffer), Context);
+
+ if (std::error_code EC = MOrErr.getError())
+ message(LDPL_FATAL, "Could not read bitcode from file : %s",
+ EC.message().c_str());
+
+ std::unique_ptr<Module> M(MOrErr.get());
+
+ SmallPtrSet<GlobalValue *, 8> Used;
+ collectUsedGlobalVariables(*M, Used, /*CompilerUsed*/ false);
+
+ DenseSet<GlobalValue *> Drop;
+ std::vector<GlobalAlias *> KeptAliases;
+ for (ld_plugin_symbol &Sym : F.syms) {
+ ld_plugin_symbol_resolution Resolution =
+ (ld_plugin_symbol_resolution)Sym.resolution;
+
+ if (options::generate_api_file)
+ *ApiFile << Sym.name << ' ' << getResolutionName(Resolution) << '\n';
+
+ GlobalValue *GV = M->getNamedValue(Sym.name);
+ if (!GV)
+ continue; // Asm symbol.
+
+ if (Resolution != LDPR_PREVAILING_DEF_IRONLY && GV->hasCommonLinkage()) {
+ // Common linkage is special. There is no single symbol that wins the
+ // resolution. Instead we have to collect the maximum alignment and size.
+ // The IR linker does that for us if we just pass it every common GV.
+ // We still have to keep track of LDPR_PREVAILING_DEF_IRONLY so we
+ // internalize once the IR linker has done its job.
+ continue;
+ }
+
+ switch (Resolution) {
+ case LDPR_UNKNOWN:
+ llvm_unreachable("Unexpected resolution");
+
+ case LDPR_RESOLVED_IR:
+ case LDPR_RESOLVED_EXEC:
+ case LDPR_RESOLVED_DYN:
+ case LDPR_UNDEF:
+ assert(GV->isDeclarationForLinker());
+ break;
+
+ case LDPR_PREVAILING_DEF_IRONLY: {
+ keepGlobalValue(*GV, KeptAliases);
+ if (!Used.count(GV)) {
+ // Since we use the regular lib/Linker, we cannot just internalize GV
+ // now or it will not be copied to the merged module. Instead we force
+ // it to be copied and then internalize it.
+ Internalize.insert(Sym.name);
+ }
+ break;
+ }
+
+ case LDPR_PREVAILING_DEF:
+ keepGlobalValue(*GV, KeptAliases);
+ break;
+
+ case LDPR_PREEMPTED_IR:
+ // Gold might have selected a linkonce_odr and preempted a weak_odr.
+ // In that case we have to make sure we don't end up internalizing it.
+ if (!GV->isDiscardableIfUnused())
+ Maybe.erase(Sym.name);
+
+ // fall-through
+ case LDPR_PREEMPTED_REG:
+ Drop.insert(GV);
+ break;
+
+ case LDPR_PREVAILING_DEF_IRONLY_EXP: {
+ // We can only check for address uses after we merge the modules. The
+ // reason is that this GV might have a copy in another module
+ // and in that module the address might be significant, but that
+ // copy will be LDPR_PREEMPTED_IR.
+ if (GV->hasLinkOnceODRLinkage())
+ Maybe.insert(Sym.name);
+ keepGlobalValue(*GV, KeptAliases);
+ break;
+ }
+ }
+
+ free(Sym.name);
+ free(Sym.comdat_key);
+ Sym.name = nullptr;
+ Sym.comdat_key = nullptr;
+ }
+
+ ValueToValueMapTy VM;
+ LocalValueMaterializer Materializer(Drop);
+ for (GlobalAlias *GA : KeptAliases) {
+ // Gold told us to keep GA. It is possible that a GV usied in the aliasee
+ // expression is being dropped. If that is the case, that GV must be copied.
+ Constant *Aliasee = GA->getAliasee();
+ Constant *Replacement = mapConstantToLocalCopy(Aliasee, VM, &Materializer);
+ if (Aliasee != Replacement)
+ GA->setAliasee(Replacement);
+ }
+
+ for (auto *GV : Drop)
+ drop(*GV);
+
+ return M;
+}
+
+static void runLTOPasses(Module &M, TargetMachine &TM) {
+ PassManager passes;
+ PassManagerBuilder PMB;
+ PMB.LibraryInfo = new TargetLibraryInfo(Triple(TM.getTargetTriple()));
+ PMB.Inliner = createFunctionInliningPass();
+ PMB.VerifyInput = true;
+ PMB.VerifyOutput = true;
+ PMB.populateLTOPassManager(passes, &TM);
+ passes.run(M);
+}
+
+static void codegen(Module &M) {
+ const std::string &TripleStr = M.getTargetTriple();
+ Triple TheTriple(TripleStr);
+
+ std::string ErrMsg;
+ const Target *TheTarget = TargetRegistry::lookupTarget(TripleStr, ErrMsg);
+ if (!TheTarget)
+ message(LDPL_FATAL, "Target not found: %s", ErrMsg.c_str());
+
+ if (unsigned NumOpts = options::extra.size())
+ cl::ParseCommandLineOptions(NumOpts, &options::extra[0]);
+
+ SubtargetFeatures Features;
+ Features.getDefaultSubtargetFeatures(TheTriple);
+ for (const std::string &A : MAttrs)
+ Features.AddFeature(A);
+
+ TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
+ std::unique_ptr<TargetMachine> TM(TheTarget->createTargetMachine(
+ TripleStr, options::mcpu, Features.getString(), Options, RelocationModel,
+ CodeModel::Default, CodeGenOpt::Aggressive));
+
+ runLTOPasses(M, *TM);
+
+ PassManager CodeGenPasses;
+ CodeGenPasses.add(new DataLayoutPass());
+
+ SmallString<128> Filename;
+ int FD;
+ if (options::obj_path.empty()) {
+ std::error_code EC =
+ sys::fs::createTemporaryFile("lto-llvm", "o", FD, Filename);
+ if (EC)
+ message(LDPL_FATAL, "Could not create temorary file: %s",
+ EC.message().c_str());
+ } else {
+ Filename = options::obj_path;
+ std::error_code EC =
+ sys::fs::openFileForWrite(Filename.c_str(), FD, sys::fs::F_None);
+ if (EC)
+ message(LDPL_FATAL, "Could not open file: %s", EC.message().c_str());
+ }
+
+ {
+ raw_fd_ostream OS(FD, true);
+ formatted_raw_ostream FOS(OS);
+
+ if (TM->addPassesToEmitFile(CodeGenPasses, FOS,
+ TargetMachine::CGFT_ObjectFile))
+ message(LDPL_FATAL, "Failed to setup codegen");
+ CodeGenPasses.run(M);
+ }
+
+ if (add_input_file(Filename.c_str()) != LDPS_OK)
+ message(LDPL_FATAL,
+ "Unable to add .o file to the link. File left behind in: %s",
+ Filename.c_str());
+
+ if (options::obj_path.empty())
+ Cleanup.push_back(Filename.c_str());
}
/// gold informs us that all symbols have been read. At this point, we use
/// get_symbols to see if any of our definitions have been overridden by a
/// native object file. Then, perform optimization and codegen.
-static ld_plugin_status allSymbolsReadHook(raw_fd_ostream *apiFile) {
- assert(CodeGen);
+static ld_plugin_status allSymbolsReadHook(raw_fd_ostream *ApiFile) {
+ if (Modules.empty())
+ return LDPS_OK;
- for (claimed_file &F : Modules) {
- if (F.syms.empty())
- continue;
- get_symbols(F.handle, F.syms.size(), &F.syms[0]);
- for (ld_plugin_symbol &Sym : F.syms) {
- if (mustPreserve(Sym)) {
- CodeGen->addMustPreserveSymbol(Sym.name);
+ LLVMContext Context;
+ std::unique_ptr<Module> Combined(new Module("ld-temp.o", Context));
+ Linker L(Combined.get());
- if (options::generate_api_file)
- (*apiFile) << Sym.name << "\n";
- }
+ std::string DefaultTriple = sys::getDefaultTargetTriple();
+
+ StringSet<> Internalize;
+ StringSet<> Maybe;
+ for (claimed_file &F : Modules) {
+ std::unique_ptr<Module> M =
+ getModuleForFile(Context, F, ApiFile, Internalize, Maybe);
+ if (!options::triple.empty())
+ M->setTargetTriple(options::triple.c_str());
+ else if (M->getTargetTriple().empty()) {
+ M->setTargetTriple(DefaultTriple);
}
+
+ if (L.linkInModule(M.get()))
+ message(LDPL_FATAL, "Failed to link module");
}
- CodeGen->setCodePICModel(output_type);
- CodeGen->setDebugInfo(LTO_DEBUG_MODEL_DWARF);
- if (!options::mcpu.empty())
- CodeGen->setCpu(options::mcpu.c_str());
+ for (const auto &Name : Internalize) {
+ GlobalValue *GV = Combined->getNamedValue(Name.first());
+ if (GV)
+ internalize(*GV);
+ }
+
+ for (const auto &Name : Maybe) {
+ GlobalValue *GV = Combined->getNamedValue(Name.first());
+ if (!GV)
+ continue;
+ GV->setLinkage(GlobalValue::LinkOnceODRLinkage);
+ if (canBeOmittedFromSymbolTable(GV))
+ internalize(*GV);
+ }
if (options::generate_bc_file != options::BC_NO) {
std::string path;
path = options::bc_path;
else
path = output_name + ".bc";
- std::string Error;
- if (!CodeGen->writeMergedModules(path.c_str(), Error))
- message(LDPL_FATAL, "Failed to write the output file.");
+ {
+ std::error_code EC;
+ raw_fd_ostream OS(path, EC, sys::fs::OpenFlags::F_None);
+ if (EC)
+ message(LDPL_FATAL, "Failed to write the output file.");
+ WriteBitcodeToFile(L.getModule(), OS);
+ }
if (options::generate_bc_file == options::BC_ONLY)
return LDPS_OK;
}
- std::string ObjPath;
- {
- const char *Temp;
- std::string Error;
- if (!CodeGen->compile_to_file(&Temp, /*DisableOpt*/ false, /*DisableInline*/
- false, /*DisableGVNLoadPRE*/ false, Error))
- message(LDPL_ERROR, "Could not produce a combined object file\n");
- ObjPath = Temp;
- }
-
- for (claimed_file &F : Modules) {
- for (ld_plugin_symbol &Sym : F.syms)
- free(Sym.name);
- }
-
- if (add_input_file(ObjPath.c_str()) != LDPS_OK) {
- message(LDPL_ERROR, "Unable to add .o file to the link.");
- message(LDPL_ERROR, "File left behind in: %s", ObjPath.c_str());
- return LDPS_ERR;
- }
+ codegen(*L.getModule());
if (!options::extra_library_path.empty() &&
- set_extra_library_path(options::extra_library_path.c_str()) != LDPS_OK) {
- message(LDPL_ERROR, "Unable to set the extra library path.");
- return LDPS_ERR;
- }
-
- if (options::obj_path.empty())
- Cleanup.push_back(ObjPath);
+ set_extra_library_path(options::extra_library_path.c_str()) != LDPS_OK)
+ message(LDPL_FATAL, "Unable to set the extra library path.");
return LDPS_OK;
}
if (!options::generate_api_file) {
Ret = allSymbolsReadHook(nullptr);
} else {
- std::string Error;
- raw_fd_ostream apiFile("apifile.txt", Error, sys::fs::F_None);
- if (!Error.empty())
+ std::error_code EC;
+ raw_fd_ostream ApiFile("apifile.txt", EC, sys::fs::F_None);
+ if (EC)
message(LDPL_FATAL, "Unable to open apifile.txt for writing: %s",
- Error.c_str());
- Ret = allSymbolsReadHook(&apiFile);
+ EC.message().c_str());
+ Ret = allSymbolsReadHook(&ApiFile);
}
- delete CodeGen;
-
if (options::generate_bc_file == options::BC_ONLY)
exit(0);
projects / oota-llvm.git / blobdiff