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-rw-r--r--tools/gold/gold-plugin.cpp275
1 files changed, 171 insertions, 104 deletions
diff --git a/tools/gold/gold-plugin.cpp b/tools/gold/gold-plugin.cpp
index cfda6d2..e3a57b5 100644
--- a/tools/gold/gold-plugin.cpp
+++ b/tools/gold/gold-plugin.cpp
@@ -15,23 +15,28 @@
#include "llvm/Config/config.h" // plugin-api.h requires HAVE_STDINT_H
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/StringSet.h"
+#include "llvm/Analysis/TargetLibraryInfo.h"
+#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/CodeGen/Analysis.h"
#include "llvm/CodeGen/CommandFlags.h"
+#include "llvm/IR/AutoUpgrade.h"
#include "llvm/IR/Constants.h"
+#include "llvm/IR/DiagnosticInfo.h"
+#include "llvm/IR/DiagnosticPrinter.h"
#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/LegacyPassManager.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/ManagedStatic.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"
@@ -78,9 +83,14 @@ static std::vector<std::string> Cleanup;
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;
@@ -109,9 +119,11 @@ namespace options {
} 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
@@ -253,6 +265,44 @@ static const GlobalObject *getBaseObject(const GlobalValue &GV) {
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) {
+ if (const auto *BDI = dyn_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);
+ }
+ ld_plugin_level Level;
+ switch (DI.getSeverity()) {
+ case DS_Error:
+ message(LDPL_FATAL, "LLVM gold plugin has failed to create LTO module: %s",
+ ErrStorage.c_str());
+ llvm_unreachable("Fatal doesn't return.");
+ case DS_Warning:
+ Level = LDPL_WARNING;
+ break;
+ case DS_Remark:
+ case DS_Note:
+ Level = LDPL_INFO;
+ break;
+ }
+ message(Level, "LLVM gold plugin: %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.
@@ -286,11 +336,11 @@ static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
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;
@@ -310,10 +360,7 @@ static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
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());
@@ -467,51 +514,10 @@ static const char *getResolutionName(ld_plugin_symbol_resolution R) {
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) {}
@@ -520,13 +526,39 @@ public:
}
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,
@@ -534,12 +566,17 @@ 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,
+getModuleForFile(LLVMContext &Context, claimed_file &F,
+ ld_plugin_input_file &Info, 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");
@@ -548,42 +585,45 @@ getModuleForFile(LLVMContext &Context, claimed_file &F, raw_fd_ostream *ApiFile,
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, Info.filesize),
+ Info.name);
+ 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);
+ object::IRObjectFile &Obj = **ObjOrErr;
- if (std::error_code EC = MOrErr.getError())
- message(LDPL_FATAL, "Could not read bitcode from file : %s",
- EC.message().c_str());
+ Module &M = Obj.getModule();
- std::unique_ptr<Module> M(MOrErr.get());
+ UpgradeDebugInfo(M);
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
@@ -591,6 +631,7 @@ getModuleForFile(LLVMContext &Context, claimed_file &F, raw_fd_ostream *ApiFile,
// 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;
}
@@ -601,17 +642,23 @@ getModuleForFile(LLVMContext &Context, claimed_file &F, raw_fd_ostream *ApiFile,
case LDPR_RESOLVED_IR:
case LDPR_RESOLVED_EXEC:
case LDPR_RESOLVED_DYN:
- case LDPR_UNDEF:
assert(GV->isDeclarationForLinker());
break;
+ case LDPR_UNDEF:
+ if (!GV->isDeclarationForLinker()) {
+ assert(GV->hasComdat());
+ Drop.insert(GV);
+ }
+ 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);
+ Internalize.insert(GV->getName());
}
break;
}
@@ -624,7 +671,7 @@ getModuleForFile(LLVMContext &Context, claimed_file &F, raw_fd_ostream *ApiFile,
// 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:
@@ -637,16 +684,13 @@ getModuleForFile(LLVMContext &Context, claimed_file &F, raw_fd_ostream *ApiFile,
// 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;
@@ -656,26 +700,31 @@ getModuleForFile(LLVMContext &Context, claimed_file &F, raw_fd_ostream *ApiFile,
// 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) {
- PassManager passes;
+ if (const DataLayout *DL = TM.getDataLayout())
+ M.setDataLayout(DL);
+
+ legacy::PassManager passes;
+ passes.add(new DataLayoutPass());
+ passes.add(createTargetTransformInfoWrapperPass(TM.getTargetIRAnalysis()));
+
PassManagerBuilder PMB;
- PMB.LibraryInfo = new TargetLibraryInfo(Triple(TM.getTargetTriple()));
+ PMB.LibraryInfo = new TargetLibraryInfoImpl(Triple(TM.getTargetTriple()));
PMB.Inliner = createFunctionInliningPass();
PMB.VerifyInput = true;
PMB.VerifyOutput = true;
PMB.LoopVectorize = true;
PMB.SLPVectorize = true;
- PMB.populateLTOPassManager(passes, &TM);
+ PMB.populateLTOPassManager(passes);
passes.run(M);
}
@@ -711,10 +760,10 @@ static void codegen(Module &M) {
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;
+ legacy::PassManager CodeGenPasses;
CodeGenPasses.add(new DataLayoutPass());
SmallString<128> Filename;
@@ -760,6 +809,8 @@ static ld_plugin_status allSymbolsReadHook(raw_fd_ostream *ApiFile) {
return LDPS_OK;
LLVMContext Context;
+ Context.setDiagnosticHandler(diagnosticHandler);
+
std::unique_ptr<Module> Combined(new Module("ld-temp.o", Context));
Linker L(Combined.get());
@@ -768,8 +819,11 @@ static ld_plugin_status allSymbolsReadHook(raw_fd_ostream *ApiFile) {
StringSet<> Internalize;
StringSet<> Maybe;
for (claimed_file &F : Modules) {
+ ld_plugin_input_file File;
+ if (get_input_file(F.handle, &File) != LDPS_OK)
+ message(LDPL_FATAL, "Failed to get file information");
std::unique_ptr<Module> M =
- getModuleForFile(Context, F, ApiFile, Internalize, Maybe);
+ getModuleForFile(Context, F, File, ApiFile, Internalize, Maybe);
if (!options::triple.empty())
M->setTargetTriple(options::triple.c_str());
else if (M->getTargetTriple().empty()) {
@@ -778,6 +832,8 @@ static ld_plugin_status allSymbolsReadHook(raw_fd_ostream *ApiFile) {
if (L.linkInModule(M.get()))
message(LDPL_FATAL, "Failed to link module");
+ if (release_input_file(F.handle) != LDPS_OK)
+ message(LDPL_FATAL, "Failed to release file information");
}
for (const auto &Name : Internalize) {
@@ -795,14 +851,17 @@ static ld_plugin_status allSymbolsReadHook(raw_fd_ostream *ApiFile) {
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;
}
@@ -828,8 +887,16 @@ static ld_plugin_status all_symbols_read_hook(void) {
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) {
+ if (options::TheOutputType == options::OT_DISABLE)
+ // Remove the output file here since ld.bfd creates the output file
+ // early.
+ sys::fs::remove(output_name);
exit(0);
+ }
return Ret;
}
generated by cgit v1.1 at 2024-12-22 11:28:51 +0000