#include "llvm/CodeGen/Analysis.h"
#include "llvm/CodeGen/CommandFlags.h"
#include "llvm/IR/Constants.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/PassManager.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/Host.h"
+#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
static llvm::TargetOptions TargetOpts;
namespace options {
- enum generate_bc { BC_NO, BC_ONLY, BC_SAVE_TEMPS };
+ enum OutputType {
+ OT_NORMAL,
+ OT_DISABLE,
+ OT_BC_ONLY,
+ OT_SAVE_TEMPS
+ };
static bool generate_api_file = false;
- static generate_bc generate_bc_file = BC_NO;
+ static OutputType TheOutputType = OT_NORMAL;
static std::string obj_path;
static std::string extra_library_path;
static std::string triple;
} else if (opt.startswith("obj-path=")) {
obj_path = opt.substr(strlen("obj-path="));
} else if (opt == "emit-llvm") {
- generate_bc_file = BC_ONLY;
+ TheOutputType = OT_BC_ONLY;
} else if (opt == "save-temps") {
- generate_bc_file = BC_SAVE_TEMPS;
+ TheOutputType = OT_SAVE_TEMPS;
+ } else if (opt == "disable-output") {
+ TheOutputType = OT_DISABLE;
} else {
// Save this option to pass to the code generator.
// ParseCommandLineOptions() expects argv[0] to be program name. Lazily
return cast<GlobalObject>(&GV);
}
+static bool shouldSkip(uint32_t Symflags) {
+ if (!(Symflags & object::BasicSymbolRef::SF_Global))
+ return true;
+ if (Symflags & object::BasicSymbolRef::SF_FormatSpecific)
+ return true;
+ return false;
+}
+
+static void diagnosticHandler(const DiagnosticInfo &DI, void *Context) {
+ assert(DI.getSeverity() == DS_Error && "Only expecting errors");
+ const auto &BDI = cast<BitcodeDiagnosticInfo>(DI);
+ std::error_code EC = BDI.getError();
+ if (EC == BitcodeError::InvalidBitcodeSignature)
+ return;
+
+ std::string ErrStorage;
+ {
+ raw_string_ostream OS(ErrStorage);
+ DiagnosticPrinterRawOStream DP(OS);
+ DI.print(DP);
+ }
+ message(LDPL_FATAL, "LLVM gold plugin has failed to create LTO module: %s",
+ ErrStorage.c_str());
+}
+
/// 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.
BufferRef = Buffer->getMemBufferRef();
}
+ Context.setDiagnosticHandler(diagnosticHandler);
ErrorOr<std::unique_ptr<object::IRObjectFile>> ObjOrErr =
- object::IRObjectFile::createIRObjectFile(BufferRef, Context);
+ object::IRObjectFile::create(BufferRef, Context);
std::error_code EC = ObjOrErr.getError();
- if (EC == BitcodeError::InvalidBitcodeSignature ||
- EC == object::object_error::invalid_file_type ||
+ if (EC == object::object_error::invalid_file_type ||
EC == object::object_error::bitcode_section_not_found)
return LDPS_OK;
for (auto &Sym : Obj->symbols()) {
uint32_t Symflags = Sym.getFlags();
- if (!(Symflags & object::BasicSymbolRef::SF_Global))
- continue;
-
- if (Symflags & object::BasicSymbolRef::SF_FormatSpecific)
+ if (shouldSkip(Symflags))
continue;
cf.syms.push_back(ld_plugin_symbol());
llvm_unreachable("Unknown resolution");
}
-static GlobalObject *makeInternalReplacement(GlobalObject *GO) {
- Module *M = GO->getParent();
- GlobalObject *Ret;
- if (auto *F = dyn_cast<Function>(GO)) {
- 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());
-
- return Ret;
-}
-
namespace {
class LocalValueMaterializer : public ValueMaterializer {
DenseSet<GlobalValue *> &Dropped;
+ DenseMap<GlobalObject *, GlobalObject *> LocalVersions;
public:
LocalValueMaterializer(DenseSet<GlobalValue *> &Dropped) : Dropped(Dropped) {}
}
Value *LocalValueMaterializer::materializeValueFor(Value *V) {
- auto *GV = dyn_cast<GlobalValue>(V);
- if (!GV)
+ auto *GO = dyn_cast<GlobalObject>(V);
+ if (!GO)
return nullptr;
- if (!Dropped.count(GV))
+
+ auto I = LocalVersions.find(GO);
+ if (I != LocalVersions.end())
+ return I->second;
+
+ if (!Dropped.count(GO))
return nullptr;
- assert(!isa<GlobalAlias>(GV) && "Found alias point to weak alias.");
- return makeInternalReplacement(cast<GlobalObject>(GV));
+
+ Module &M = *GO->getParent();
+ GlobalValue::LinkageTypes L = GO->getLinkage();
+ GlobalObject *Declaration;
+ if (auto *F = dyn_cast<Function>(GO)) {
+ Declaration = Function::Create(F->getFunctionType(), L, "", &M);
+ } else {
+ auto *Var = cast<GlobalVariable>(GO);
+ Declaration = new GlobalVariable(M, Var->getType()->getElementType(),
+ Var->isConstant(), L,
+ /*Initializer*/ nullptr);
+ }
+ Declaration->takeName(GO);
+ Declaration->copyAttributesFrom(GO);
+
+ GO->setLinkage(GlobalValue::InternalLinkage);
+ GO->setName(Declaration->getName());
+ Dropped.erase(GO);
+ GO->replaceAllUsesWith(Declaration);
+
+ LocalVersions[Declaration] = GO;
+
+ return GO;
}
static Constant *mapConstantToLocalCopy(Constant *C, ValueToValueMapTy &VM,
return MapValue(C, VM, RF_IgnoreMissingEntries, nullptr, Materializer);
}
+static void freeSymName(ld_plugin_symbol &Sym) {
+ free(Sym.name);
+ free(Sym.comdat_key);
+ Sym.name = nullptr;
+ Sym.comdat_key = nullptr;
+}
+
static std::unique_ptr<Module>
getModuleForFile(LLVMContext &Context, claimed_file &F, raw_fd_ostream *ApiFile,
StringSet<> &Internalize, StringSet<> &Maybe) {
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())
+ MemoryBufferRef BufferRef(StringRef((const char *)View, File.filesize), "");
+ ErrorOr<std::unique_ptr<object::IRObjectFile>> ObjOrErr =
+ object::IRObjectFile::create(BufferRef, Context);
+
+ if (std::error_code EC = ObjOrErr.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());
+ object::IRObjectFile &Obj = **ObjOrErr;
- std::unique_ptr<Module> M(MOrErr.get());
+ Module &M = Obj.getModule();
SmallPtrSet<GlobalValue *, 8> Used;
- collectUsedGlobalVariables(*M, Used, /*CompilerUsed*/ false);
+ collectUsedGlobalVariables(M, Used, /*CompilerUsed*/ false);
DenseSet<GlobalValue *> Drop;
std::vector<GlobalAlias *> KeptAliases;
- for (ld_plugin_symbol &Sym : F.syms) {
+
+ unsigned SymNum = 0;
+ for (auto &ObjSym : Obj.symbols()) {
+ if (shouldSkip(ObjSym.getFlags()))
+ continue;
+ ld_plugin_symbol &Sym = F.syms[SymNum];
+ ++SymNum;
+
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)
+ GlobalValue *GV = Obj.getSymbolGV(ObjSym.getRawDataRefImpl());
+ if (!GV) {
+ freeSymName(Sym);
continue; // Asm symbol.
+ }
if (Resolution != LDPR_PREVAILING_DEF_IRONLY && GV->hasCommonLinkage()) {
// Common linkage is special. There is no single symbol that wins the
// 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.
+ freeSymName(Sym);
continue;
}
// 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);
+ Internalize.insert(GV->getName());
}
break;
}
// 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);
+ Maybe.erase(GV->getName());
// fall-through
case LDPR_PREEMPTED_REG:
// and in that module the address might be significant, but that
// copy will be LDPR_PREEMPTED_IR.
if (GV->hasLinkOnceODRLinkage())
- Maybe.insert(Sym.name);
+ Maybe.insert(GV->getName());
keepGlobalValue(*GV, KeptAliases);
break;
}
}
- free(Sym.name);
- free(Sym.comdat_key);
- Sym.name = nullptr;
- Sym.comdat_key = nullptr;
+ freeSymName(Sym);
}
ValueToValueMapTy VM;
// 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);
+ GA->setAliasee(Replacement);
}
for (auto *GV : Drop)
drop(*GV);
- return M;
+ return Obj.takeModule();
}
static void runLTOPasses(Module &M, TargetMachine &TM) {
runLTOPasses(M, *TM);
- if (options::generate_bc_file == options::BC_SAVE_TEMPS)
+ if (options::TheOutputType == options::OT_SAVE_TEMPS)
saveBCFile(output_name + ".opt.bc", M);
PassManager CodeGenPasses;
internalize(*GV);
}
- if (options::generate_bc_file != options::BC_NO) {
+ if (options::TheOutputType == options::OT_DISABLE)
+ return LDPS_OK;
+
+ if (options::TheOutputType != options::OT_NORMAL) {
std::string path;
- if (options::generate_bc_file == options::BC_ONLY)
+ if (options::TheOutputType == options::OT_BC_ONLY)
path = output_name;
else
path = output_name + ".bc";
saveBCFile(path, *L.getModule());
- if (options::generate_bc_file == options::BC_ONLY)
+ if (options::TheOutputType == options::OT_BC_ONLY)
return LDPS_OK;
}
Ret = allSymbolsReadHook(&ApiFile);
}
- if (options::generate_bc_file == options::BC_ONLY)
+ llvm_shutdown();
+
+ if (options::TheOutputType == options::OT_BC_ONLY ||
+ options::TheOutputType == options::OT_DISABLE)
exit(0);
return Ret;
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