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authorPeter Collingbourne <peter@pcc.me.uk>2013-09-24 23:52:22 +0000
committerPeter Collingbourne <peter@pcc.me.uk>2013-09-24 23:52:22 +0000
commitcc48854d5d51a2d7557f1040a61f160ad86c9729 (patch)
tree8b1852fb26b556df1366f94f1ab652b995a0ab36 /lib/LTO
parent85509802eba15c82ff486f512a0b559699dc6999 (diff)
downloadexternal_llvm-cc48854d5d51a2d7557f1040a61f160ad86c9729.zip
external_llvm-cc48854d5d51a2d7557f1040a61f160ad86c9729.tar.gz
external_llvm-cc48854d5d51a2d7557f1040a61f160ad86c9729.tar.bz2
Move LTO support library to a component, allowing it to be tested
more reliably across platforms. Patch by Tom Roeder! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191343 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/LTO')
-rw-r--r--lib/LTO/CMakeLists.txt4
-rw-r--r--lib/LTO/LLVMBuild.txt22
-rw-r--r--lib/LTO/LTOCodeGenerator.cpp453
-rw-r--r--lib/LTO/LTOModule.cpp900
-rw-r--r--lib/LTO/Makefile15
5 files changed, 1394 insertions, 0 deletions
diff --git a/lib/LTO/CMakeLists.txt b/lib/LTO/CMakeLists.txt
new file mode 100644
index 0000000..8e00bcb
--- /dev/null
+++ b/lib/LTO/CMakeLists.txt
@@ -0,0 +1,4 @@
+add_llvm_library(LLVMLTO
+ LTOModule.cpp
+ LTOCodeGenerator.cpp
+ )
diff --git a/lib/LTO/LLVMBuild.txt b/lib/LTO/LLVMBuild.txt
new file mode 100644
index 0000000..38c1170
--- /dev/null
+++ b/lib/LTO/LLVMBuild.txt
@@ -0,0 +1,22 @@
+;===- ./lib/LTO/LLVMBuild.txt ----------------------------------*- Conf -*--===;
+;
+; The LLVM Compiler Infrastructure
+;
+; This file is distributed under the University of Illinois Open Source
+; License. See LICENSE.TXT for details.
+;
+;===------------------------------------------------------------------------===;
+;
+; This is an LLVMBuild description file for the components in this subdirectory.
+;
+; For more information on the LLVMBuild system, please see:
+;
+; http://llvm.org/docs/LLVMBuild.html
+;
+;===------------------------------------------------------------------------===;
+
+[component_0]
+type = Library
+name = LTO
+parent = Libraries
+required_libraries = Analysis BitReader BitWriter Core IPO Linker MC MCParser Scalar Support Target Vectorize \ No newline at end of file
diff --git a/lib/LTO/LTOCodeGenerator.cpp b/lib/LTO/LTOCodeGenerator.cpp
new file mode 100644
index 0000000..22e9754
--- /dev/null
+++ b/lib/LTO/LTOCodeGenerator.cpp
@@ -0,0 +1,453 @@
+//===-LTOCodeGenerator.cpp - LLVM Link Time Optimizer ---------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Link Time Optimization library. This library is
+// intended to be used by linker to optimize code at link time.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/LTO/LTOCodeGenerator.h"
+#include "llvm/LTO/LTOModule.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Analysis/Passes.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/Config/config.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "llvm/InitializePasses.h"
+#include "llvm/Linker.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/SubtargetFeature.h"
+#include "llvm/PassManager.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/TargetSelect.h"
+#include "llvm/Support/ToolOutputFile.h"
+#include "llvm/Support/system_error.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Target/Mangler.h"
+#include "llvm/Transforms/IPO.h"
+#include "llvm/Transforms/IPO/PassManagerBuilder.h"
+#include "llvm/Transforms/ObjCARC.h"
+using namespace llvm;
+
+static cl::opt<bool>
+DisableOpt("disable-opt", cl::init(false),
+ cl::desc("Do not run any optimization passes"));
+
+static cl::opt<bool>
+DisableInline("disable-inlining", cl::init(false),
+ cl::desc("Do not run the inliner pass"));
+
+static cl::opt<bool>
+DisableGVNLoadPRE("disable-gvn-loadpre", cl::init(false),
+ cl::desc("Do not run the GVN load PRE pass"));
+
+const char* LTOCodeGenerator::getVersionString() {
+#ifdef LLVM_VERSION_INFO
+ return PACKAGE_NAME " version " PACKAGE_VERSION ", " LLVM_VERSION_INFO;
+#else
+ return PACKAGE_NAME " version " PACKAGE_VERSION;
+#endif
+}
+
+LTOCodeGenerator::LTOCodeGenerator()
+ : Context(getGlobalContext()), Linker(new Module("ld-temp.o", Context)),
+ TargetMach(NULL), EmitDwarfDebugInfo(false), ScopeRestrictionsDone(false),
+ CodeModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC), NativeObjectFile(NULL) {
+ initializeLTOPasses();
+}
+
+LTOCodeGenerator::~LTOCodeGenerator() {
+ delete TargetMach;
+ delete NativeObjectFile;
+ delete Linker.getModule();
+
+ for (std::vector<char *>::iterator I = CodegenOptions.begin(),
+ E = CodegenOptions.end();
+ I != E; ++I)
+ free(*I);
+}
+
+// Initialize LTO passes. Please keep this funciton in sync with
+// PassManagerBuilder::populateLTOPassManager(), and make sure all LTO
+// passes are initialized.
+//
+void LTOCodeGenerator::initializeLTOPasses() {
+ PassRegistry &R = *PassRegistry::getPassRegistry();
+
+ initializeInternalizePassPass(R);
+ initializeIPSCCPPass(R);
+ initializeGlobalOptPass(R);
+ initializeConstantMergePass(R);
+ initializeDAHPass(R);
+ initializeInstCombinerPass(R);
+ initializeSimpleInlinerPass(R);
+ initializePruneEHPass(R);
+ initializeGlobalDCEPass(R);
+ initializeArgPromotionPass(R);
+ initializeJumpThreadingPass(R);
+ initializeSROAPass(R);
+ initializeSROA_DTPass(R);
+ initializeSROA_SSAUpPass(R);
+ initializeFunctionAttrsPass(R);
+ initializeGlobalsModRefPass(R);
+ initializeLICMPass(R);
+ initializeGVNPass(R);
+ initializeMemCpyOptPass(R);
+ initializeDCEPass(R);
+ initializeCFGSimplifyPassPass(R);
+}
+
+bool LTOCodeGenerator::addModule(LTOModule* mod, std::string& errMsg) {
+ bool ret = Linker.linkInModule(mod->getLLVVMModule(), &errMsg);
+
+ const std::vector<const char*> &undefs = mod->getAsmUndefinedRefs();
+ for (int i = 0, e = undefs.size(); i != e; ++i)
+ AsmUndefinedRefs[undefs[i]] = 1;
+
+ return !ret;
+}
+
+void LTOCodeGenerator::setDebugInfo(lto_debug_model debug) {
+ switch (debug) {
+ case LTO_DEBUG_MODEL_NONE:
+ EmitDwarfDebugInfo = false;
+ return;
+
+ case LTO_DEBUG_MODEL_DWARF:
+ EmitDwarfDebugInfo = true;
+ return;
+ }
+ llvm_unreachable("Unknown debug format!");
+}
+
+void LTOCodeGenerator::setCodePICModel(lto_codegen_model model) {
+ switch (model) {
+ case LTO_CODEGEN_PIC_MODEL_STATIC:
+ case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
+ case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
+ CodeModel = model;
+ return;
+ }
+ llvm_unreachable("Unknown PIC model!");
+}
+
+bool LTOCodeGenerator::writeMergedModules(const char *path,
+ std::string &errMsg) {
+ if (!determineTarget(errMsg))
+ return false;
+
+ // mark which symbols can not be internalized
+ applyScopeRestrictions();
+
+ // create output file
+ std::string ErrInfo;
+ tool_output_file Out(path, ErrInfo, sys::fs::F_Binary);
+ if (!ErrInfo.empty()) {
+ errMsg = "could not open bitcode file for writing: ";
+ errMsg += path;
+ return false;
+ }
+
+ // write bitcode to it
+ WriteBitcodeToFile(Linker.getModule(), Out.os());
+ Out.os().close();
+
+ if (Out.os().has_error()) {
+ errMsg = "could not write bitcode file: ";
+ errMsg += path;
+ Out.os().clear_error();
+ return false;
+ }
+
+ Out.keep();
+ return true;
+}
+
+bool LTOCodeGenerator::compile_to_file(const char** name, std::string& errMsg) {
+ // make unique temp .o file to put generated object file
+ SmallString<128> Filename;
+ int FD;
+ error_code EC = sys::fs::createTemporaryFile("lto-llvm", "o", FD, Filename);
+ if (EC) {
+ errMsg = EC.message();
+ return false;
+ }
+
+ // generate object file
+ tool_output_file objFile(Filename.c_str(), FD);
+
+ bool genResult = generateObjectFile(objFile.os(), errMsg);
+ objFile.os().close();
+ if (objFile.os().has_error()) {
+ objFile.os().clear_error();
+ sys::fs::remove(Twine(Filename));
+ return false;
+ }
+
+ objFile.keep();
+ if (!genResult) {
+ sys::fs::remove(Twine(Filename));
+ return false;
+ }
+
+ NativeObjectPath = Filename.c_str();
+ *name = NativeObjectPath.c_str();
+ return true;
+}
+
+const void* LTOCodeGenerator::compile(size_t* length, std::string& errMsg) {
+ const char *name;
+ if (!compile_to_file(&name, errMsg))
+ return NULL;
+
+ // remove old buffer if compile() called twice
+ delete NativeObjectFile;
+
+ // read .o file into memory buffer
+ OwningPtr<MemoryBuffer> BuffPtr;
+ if (error_code ec = MemoryBuffer::getFile(name, BuffPtr, -1, false)) {
+ errMsg = ec.message();
+ sys::fs::remove(NativeObjectPath);
+ return NULL;
+ }
+ NativeObjectFile = BuffPtr.take();
+
+ // remove temp files
+ sys::fs::remove(NativeObjectPath);
+
+ // return buffer, unless error
+ if (NativeObjectFile == NULL)
+ return NULL;
+ *length = NativeObjectFile->getBufferSize();
+ return NativeObjectFile->getBufferStart();
+}
+
+bool LTOCodeGenerator::determineTarget(std::string &errMsg) {
+ if (TargetMach != NULL)
+ return true;
+
+ // if options were requested, set them
+ if (!CodegenOptions.empty())
+ cl::ParseCommandLineOptions(CodegenOptions.size(),
+ const_cast<char **>(&CodegenOptions[0]));
+
+ std::string TripleStr = Linker.getModule()->getTargetTriple();
+ if (TripleStr.empty())
+ TripleStr = sys::getDefaultTargetTriple();
+ llvm::Triple Triple(TripleStr);
+
+ // create target machine from info for merged modules
+ const Target *march = TargetRegistry::lookupTarget(TripleStr, errMsg);
+ if (march == NULL)
+ return false;
+
+ // The relocation model is actually a static member of TargetMachine and
+ // needs to be set before the TargetMachine is instantiated.
+ Reloc::Model RelocModel = Reloc::Default;
+ switch (CodeModel) {
+ case LTO_CODEGEN_PIC_MODEL_STATIC:
+ RelocModel = Reloc::Static;
+ break;
+ case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
+ RelocModel = Reloc::PIC_;
+ break;
+ case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
+ RelocModel = Reloc::DynamicNoPIC;
+ break;
+ }
+
+ // construct LTOModule, hand over ownership of module and target
+ SubtargetFeatures Features;
+ Features.getDefaultSubtargetFeatures(Triple);
+ std::string FeatureStr = Features.getString();
+ // Set a default CPU for Darwin triples.
+ if (MCpu.empty() && Triple.isOSDarwin()) {
+ if (Triple.getArch() == llvm::Triple::x86_64)
+ MCpu = "core2";
+ else if (Triple.getArch() == llvm::Triple::x86)
+ MCpu = "yonah";
+ }
+ TargetOptions Options;
+ LTOModule::getTargetOptions(Options);
+ TargetMach = march->createTargetMachine(TripleStr, MCpu, FeatureStr, Options,
+ RelocModel, CodeModel::Default,
+ CodeGenOpt::Aggressive);
+ return true;
+}
+
+void LTOCodeGenerator::
+applyRestriction(GlobalValue &GV,
+ std::vector<const char*> &MustPreserveList,
+ SmallPtrSet<GlobalValue*, 8> &AsmUsed,
+ Mangler &Mangler) {
+ SmallString<64> Buffer;
+ Mangler.getNameWithPrefix(Buffer, &GV, false);
+
+ if (GV.isDeclaration())
+ return;
+ if (MustPreserveSymbols.count(Buffer))
+ MustPreserveList.push_back(GV.getName().data());
+ if (AsmUndefinedRefs.count(Buffer))
+ AsmUsed.insert(&GV);
+}
+
+static void findUsedValues(GlobalVariable *LLVMUsed,
+ SmallPtrSet<GlobalValue*, 8> &UsedValues) {
+ if (LLVMUsed == 0) return;
+
+ ConstantArray *Inits = cast<ConstantArray>(LLVMUsed->getInitializer());
+ for (unsigned i = 0, e = Inits->getNumOperands(); i != e; ++i)
+ if (GlobalValue *GV =
+ dyn_cast<GlobalValue>(Inits->getOperand(i)->stripPointerCasts()))
+ UsedValues.insert(GV);
+}
+
+void LTOCodeGenerator::applyScopeRestrictions() {
+ if (ScopeRestrictionsDone)
+ return;
+ Module *mergedModule = Linker.getModule();
+
+ // Start off with a verification pass.
+ PassManager passes;
+ passes.add(createVerifierPass());
+
+ // mark which symbols can not be internalized
+ MCContext MContext(TargetMach->getMCAsmInfo(), TargetMach->getRegisterInfo(),
+ NULL);
+ Mangler Mangler(MContext, TargetMach);
+ std::vector<const char*> MustPreserveList;
+ SmallPtrSet<GlobalValue*, 8> AsmUsed;
+
+ for (Module::iterator f = mergedModule->begin(),
+ e = mergedModule->end(); f != e; ++f)
+ applyRestriction(*f, MustPreserveList, AsmUsed, Mangler);
+ for (Module::global_iterator v = mergedModule->global_begin(),
+ e = mergedModule->global_end(); v != e; ++v)
+ applyRestriction(*v, MustPreserveList, AsmUsed, Mangler);
+ for (Module::alias_iterator a = mergedModule->alias_begin(),
+ e = mergedModule->alias_end(); a != e; ++a)
+ applyRestriction(*a, MustPreserveList, AsmUsed, Mangler);
+
+ GlobalVariable *LLVMCompilerUsed =
+ mergedModule->getGlobalVariable("llvm.compiler.used");
+ findUsedValues(LLVMCompilerUsed, AsmUsed);
+ if (LLVMCompilerUsed)
+ LLVMCompilerUsed->eraseFromParent();
+
+ if (!AsmUsed.empty()) {
+ llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(Context);
+ std::vector<Constant*> asmUsed2;
+ for (SmallPtrSet<GlobalValue*, 16>::const_iterator i = AsmUsed.begin(),
+ e = AsmUsed.end(); i !=e; ++i) {
+ GlobalValue *GV = *i;
+ Constant *c = ConstantExpr::getBitCast(GV, i8PTy);
+ asmUsed2.push_back(c);
+ }
+
+ llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, asmUsed2.size());
+ LLVMCompilerUsed =
+ new llvm::GlobalVariable(*mergedModule, ATy, false,
+ llvm::GlobalValue::AppendingLinkage,
+ llvm::ConstantArray::get(ATy, asmUsed2),
+ "llvm.compiler.used");
+
+ LLVMCompilerUsed->setSection("llvm.metadata");
+ }
+
+ passes.add(createInternalizePass(MustPreserveList));
+
+ // apply scope restrictions
+ passes.run(*mergedModule);
+
+ ScopeRestrictionsDone = true;
+}
+
+/// Optimize merged modules using various IPO passes
+bool LTOCodeGenerator::generateObjectFile(raw_ostream &out,
+ std::string &errMsg) {
+ if (!this->determineTarget(errMsg))
+ return false;
+
+ Module *mergedModule = Linker.getModule();
+
+ // Mark which symbols can not be internalized
+ this->applyScopeRestrictions();
+
+ // Instantiate the pass manager to organize the passes.
+ PassManager passes;
+
+ // Start off with a verification pass.
+ passes.add(createVerifierPass());
+
+ // Add an appropriate DataLayout instance for this module...
+ passes.add(new DataLayout(*TargetMach->getDataLayout()));
+ TargetMach->addAnalysisPasses(passes);
+
+ // Enabling internalize here would use its AllButMain variant. It
+ // keeps only main if it exists and does nothing for libraries. Instead
+ // we create the pass ourselves with the symbol list provided by the linker.
+ if (!DisableOpt)
+ PassManagerBuilder().populateLTOPassManager(passes,
+ /*Internalize=*/false,
+ !DisableInline,
+ DisableGVNLoadPRE);
+
+ // Make sure everything is still good.
+ passes.add(createVerifierPass());
+
+ PassManager codeGenPasses;
+
+ codeGenPasses.add(new DataLayout(*TargetMach->getDataLayout()));
+ TargetMach->addAnalysisPasses(codeGenPasses);
+
+ formatted_raw_ostream Out(out);
+
+ // If the bitcode files contain ARC code and were compiled with optimization,
+ // the ObjCARCContractPass must be run, so do it unconditionally here.
+ codeGenPasses.add(createObjCARCContractPass());
+
+ if (TargetMach->addPassesToEmitFile(codeGenPasses, Out,
+ TargetMachine::CGFT_ObjectFile)) {
+ errMsg = "target file type not supported";
+ return false;
+ }
+
+ // Run our queue of passes all at once now, efficiently.
+ passes.run(*mergedModule);
+
+ // Run the code generator, and write assembly file
+ codeGenPasses.run(*mergedModule);
+
+ return true;
+}
+
+/// setCodeGenDebugOptions - Set codegen debugging options to aid in debugging
+/// LTO problems.
+void LTOCodeGenerator::setCodeGenDebugOptions(const char *options) {
+ for (std::pair<StringRef, StringRef> o = getToken(options);
+ !o.first.empty(); o = getToken(o.second)) {
+ // ParseCommandLineOptions() expects argv[0] to be program name. Lazily add
+ // that.
+ if (CodegenOptions.empty())
+ CodegenOptions.push_back(strdup("libLLVMLTO"));
+ CodegenOptions.push_back(strdup(o.first.str().c_str()));
+ }
+}
diff --git a/lib/LTO/LTOModule.cpp b/lib/LTO/LTOModule.cpp
new file mode 100644
index 0000000..1457f2f
--- /dev/null
+++ b/lib/LTO/LTOModule.cpp
@@ -0,0 +1,900 @@
+//===-- LTOModule.cpp - LLVM Link Time Optimizer --------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Link Time Optimization library. This library is
+// intended to be used by linker to optimize code at link time.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/LTO/LTOModule.h"
+#include "llvm/ADT/OwningPtr.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCInstrInfo.h"
+#include "llvm/MC/MCParser/MCAsmParser.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCTargetAsmParser.h"
+#include "llvm/MC/SubtargetFeature.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/TargetSelect.h"
+#include "llvm/Support/system_error.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+using namespace llvm;
+
+static cl::opt<bool>
+EnableFPMAD("enable-fp-mad",
+ cl::desc("Enable less precise MAD instructions to be generated"),
+ cl::init(false));
+
+static cl::opt<bool>
+DisableFPElim("disable-fp-elim",
+ cl::desc("Disable frame pointer elimination optimization"),
+ cl::init(false));
+
+static cl::opt<bool>
+EnableUnsafeFPMath("enable-unsafe-fp-math",
+ cl::desc("Enable optimizations that may decrease FP precision"),
+ cl::init(false));
+
+static cl::opt<bool>
+EnableNoInfsFPMath("enable-no-infs-fp-math",
+ cl::desc("Enable FP math optimizations that assume no +-Infs"),
+ cl::init(false));
+
+static cl::opt<bool>
+EnableNoNaNsFPMath("enable-no-nans-fp-math",
+ cl::desc("Enable FP math optimizations that assume no NaNs"),
+ cl::init(false));
+
+static cl::opt<bool>
+EnableHonorSignDependentRoundingFPMath("enable-sign-dependent-rounding-fp-math",
+ cl::Hidden,
+ cl::desc("Force codegen to assume rounding mode can change dynamically"),
+ cl::init(false));
+
+static cl::opt<bool>
+GenerateSoftFloatCalls("soft-float",
+ cl::desc("Generate software floating point library calls"),
+ cl::init(false));
+
+static cl::opt<llvm::FloatABI::ABIType>
+FloatABIForCalls("float-abi",
+ cl::desc("Choose float ABI type"),
+ cl::init(FloatABI::Default),
+ cl::values(
+ clEnumValN(FloatABI::Default, "default",
+ "Target default float ABI type"),
+ clEnumValN(FloatABI::Soft, "soft",
+ "Soft float ABI (implied by -soft-float)"),
+ clEnumValN(FloatABI::Hard, "hard",
+ "Hard float ABI (uses FP registers)"),
+ clEnumValEnd));
+
+static cl::opt<llvm::FPOpFusion::FPOpFusionMode>
+FuseFPOps("fp-contract",
+ cl::desc("Enable aggresive formation of fused FP ops"),
+ cl::init(FPOpFusion::Standard),
+ cl::values(
+ clEnumValN(FPOpFusion::Fast, "fast",
+ "Fuse FP ops whenever profitable"),
+ clEnumValN(FPOpFusion::Standard, "on",
+ "Only fuse 'blessed' FP ops."),
+ clEnumValN(FPOpFusion::Strict, "off",
+ "Only fuse FP ops when the result won't be effected."),
+ clEnumValEnd));
+
+static cl::opt<bool>
+DontPlaceZerosInBSS("nozero-initialized-in-bss",
+ cl::desc("Don't place zero-initialized symbols into bss section"),
+ cl::init(false));
+
+static cl::opt<bool>
+EnableGuaranteedTailCallOpt("tailcallopt",
+ cl::desc("Turn fastcc calls into tail calls by (potentially) changing ABI."),
+ cl::init(false));
+
+static cl::opt<bool>
+DisableTailCalls("disable-tail-calls",
+ cl::desc("Never emit tail calls"),
+ cl::init(false));
+
+static cl::opt<unsigned>
+OverrideStackAlignment("stack-alignment",
+ cl::desc("Override default stack alignment"),
+ cl::init(0));
+
+static cl::opt<std::string>
+TrapFuncName("trap-func", cl::Hidden,
+ cl::desc("Emit a call to trap function rather than a trap instruction"),
+ cl::init(""));
+
+static cl::opt<bool>
+EnablePIE("enable-pie",
+ cl::desc("Assume the creation of a position independent executable."),
+ cl::init(false));
+
+static cl::opt<bool>
+SegmentedStacks("segmented-stacks",
+ cl::desc("Use segmented stacks if possible."),
+ cl::init(false));
+
+static cl::opt<bool>
+UseInitArray("use-init-array",
+ cl::desc("Use .init_array instead of .ctors."),
+ cl::init(false));
+
+LTOModule::LTOModule(llvm::Module *m, llvm::TargetMachine *t)
+ : _module(m), _target(t),
+ _context(_target->getMCAsmInfo(), _target->getRegisterInfo(), NULL),
+ _mangler(_context, t) {}
+
+/// isBitcodeFile - Returns 'true' if the file (or memory contents) is LLVM
+/// bitcode.
+bool LTOModule::isBitcodeFile(const void *mem, size_t length) {
+ return sys::fs::identify_magic(StringRef((const char *)mem, length)) ==
+ sys::fs::file_magic::bitcode;
+}
+
+bool LTOModule::isBitcodeFile(const char *path) {
+ sys::fs::file_magic type;
+ if (sys::fs::identify_magic(path, type))
+ return false;
+ return type == sys::fs::file_magic::bitcode;
+}
+
+/// isBitcodeFileForTarget - Returns 'true' if the file (or memory contents) is
+/// LLVM bitcode for the specified triple.
+bool LTOModule::isBitcodeFileForTarget(const void *mem, size_t length,
+ const char *triplePrefix) {
+ MemoryBuffer *buffer = makeBuffer(mem, length);
+ if (!buffer)
+ return false;
+ return isTargetMatch(buffer, triplePrefix);
+}
+
+bool LTOModule::isBitcodeFileForTarget(const char *path,
+ const char *triplePrefix) {
+ OwningPtr<MemoryBuffer> buffer;
+ if (MemoryBuffer::getFile(path, buffer))
+ return false;
+ return isTargetMatch(buffer.take(), triplePrefix);
+}
+
+/// isTargetMatch - Returns 'true' if the memory buffer is for the specified
+/// target triple.
+bool LTOModule::isTargetMatch(MemoryBuffer *buffer, const char *triplePrefix) {
+ std::string Triple = getBitcodeTargetTriple(buffer, getGlobalContext());
+ delete buffer;
+ return strncmp(Triple.c_str(), triplePrefix, strlen(triplePrefix)) == 0;
+}
+
+/// makeLTOModule - Create an LTOModule. N.B. These methods take ownership of
+/// the buffer.
+LTOModule *LTOModule::makeLTOModule(const char *path, std::string &errMsg) {
+ OwningPtr<MemoryBuffer> buffer;
+ if (error_code ec = MemoryBuffer::getFile(path, buffer)) {
+ errMsg = ec.message();
+ return NULL;
+ }
+ return makeLTOModule(buffer.take(), errMsg);
+}
+
+LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
+ size_t size, std::string &errMsg) {
+ return makeLTOModule(fd, path, size, 0, errMsg);
+}
+
+LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
+ size_t map_size,
+ off_t offset,
+ std::string &errMsg) {
+ OwningPtr<MemoryBuffer> buffer;
+ if (error_code ec =
+ MemoryBuffer::getOpenFileSlice(fd, path, buffer, map_size, offset)) {
+ errMsg = ec.message();
+ return NULL;
+ }
+ return makeLTOModule(buffer.take(), errMsg);
+}
+
+LTOModule *LTOModule::makeLTOModule(const void *mem, size_t length,
+ std::string &errMsg) {
+ OwningPtr<MemoryBuffer> buffer(makeBuffer(mem, length));
+ if (!buffer)
+ return NULL;
+ return makeLTOModule(buffer.take(), errMsg);
+}
+
+void LTOModule::getTargetOptions(TargetOptions &Options) {
+ Options.LessPreciseFPMADOption = EnableFPMAD;
+ Options.NoFramePointerElim = DisableFPElim;
+ Options.AllowFPOpFusion = FuseFPOps;
+ Options.UnsafeFPMath = EnableUnsafeFPMath;
+ Options.NoInfsFPMath = EnableNoInfsFPMath;
+ Options.NoNaNsFPMath = EnableNoNaNsFPMath;
+ Options.HonorSignDependentRoundingFPMathOption =
+ EnableHonorSignDependentRoundingFPMath;
+ Options.UseSoftFloat = GenerateSoftFloatCalls;
+ if (FloatABIForCalls != FloatABI::Default)
+ Options.FloatABIType = FloatABIForCalls;
+ Options.NoZerosInBSS = DontPlaceZerosInBSS;
+ Options.GuaranteedTailCallOpt = EnableGuaranteedTailCallOpt;
+ Options.DisableTailCalls = DisableTailCalls;
+ Options.StackAlignmentOverride = OverrideStackAlignment;
+ Options.TrapFuncName = TrapFuncName;
+ Options.PositionIndependentExecutable = EnablePIE;
+ Options.EnableSegmentedStacks = SegmentedStacks;
+ Options.UseInitArray = UseInitArray;
+}
+
+LTOModule *LTOModule::makeLTOModule(MemoryBuffer *buffer,
+ std::string &errMsg) {
+ // parse bitcode buffer
+ OwningPtr<Module> m(getLazyBitcodeModule(buffer, getGlobalContext(),
+ &errMsg));
+ if (!m) {
+ delete buffer;
+ return NULL;
+ }
+
+ std::string TripleStr = m->getTargetTriple();
+ if (TripleStr.empty())
+ TripleStr = sys::getDefaultTargetTriple();
+ llvm::Triple Triple(TripleStr);
+
+ // find machine architecture for this module
+ const Target *march = TargetRegistry::lookupTarget(TripleStr, errMsg);
+ if (!march)
+ return NULL;
+
+ // construct LTOModule, hand over ownership of module and target
+ SubtargetFeatures Features;
+ Features.getDefaultSubtargetFeatures(Triple);
+ std::string FeatureStr = Features.getString();
+ // Set a default CPU for Darwin triples.
+ std::string CPU;
+ if (Triple.isOSDarwin()) {
+ if (Triple.getArch() == llvm::Triple::x86_64)
+ CPU = "core2";
+ else if (Triple.getArch() == llvm::Triple::x86)
+ CPU = "yonah";
+ }
+ TargetOptions Options;
+ getTargetOptions(Options);
+ TargetMachine *target = march->createTargetMachine(TripleStr, CPU, FeatureStr,
+ Options);
+ LTOModule *Ret = new LTOModule(m.take(), target);
+ if (Ret->parseSymbols(errMsg)) {
+ delete Ret;
+ return NULL;
+ }
+
+ return Ret;
+}
+
+/// makeBuffer - Create a MemoryBuffer from a memory range.
+MemoryBuffer *LTOModule::makeBuffer(const void *mem, size_t length) {
+ const char *startPtr = (const char*)mem;
+ return MemoryBuffer::getMemBuffer(StringRef(startPtr, length), "", false);
+}
+
+/// objcClassNameFromExpression - Get string that the data pointer points to.
+bool
+LTOModule::objcClassNameFromExpression(const Constant *c, std::string &name) {
+ if (const ConstantExpr *ce = dyn_cast<ConstantExpr>(c)) {
+ Constant *op = ce->getOperand(0);
+ if (GlobalVariable *gvn = dyn_cast<GlobalVariable>(op)) {
+ Constant *cn = gvn->getInitializer();
+ if (ConstantDataArray *ca = dyn_cast<ConstantDataArray>(cn)) {
+ if (ca->isCString()) {
+ name = ".objc_class_name_" + ca->getAsCString().str();
+ return true;
+ }
+ }
+ }
+ }
+ return false;
+}
+
+/// addObjCClass - Parse i386/ppc ObjC class data structure.
+void LTOModule::addObjCClass(const GlobalVariable *clgv) {
+ const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
+ if (!c) return;
+
+ // second slot in __OBJC,__class is pointer to superclass name
+ std::string superclassName;
+ if (objcClassNameFromExpression(c->getOperand(1), superclassName)) {
+ NameAndAttributes info;
+ StringMap<NameAndAttributes>::value_type &entry =
+ _undefines.GetOrCreateValue(superclassName);
+ if (!entry.getValue().name) {
+ const char *symbolName = entry.getKey().data();
+ info.name = symbolName;
+ info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
+ info.isFunction = false;
+ info.symbol = clgv;
+ entry.setValue(info);
+ }
+ }
+
+ // third slot in __OBJC,__class is pointer to class name
+ std::string className;
+ if (objcClassNameFromExpression(c->getOperand(2), className)) {
+ StringSet::value_type &entry = _defines.GetOrCreateValue(className);
+ entry.setValue(1);
+
+ NameAndAttributes info;
+ info.name = entry.getKey().data();
+ info.attributes = LTO_SYMBOL_PERMISSIONS_DATA |
+ LTO_SYMBOL_DEFINITION_REGULAR | LTO_SYMBOL_SCOPE_DEFAULT;
+ info.isFunction = false;
+ info.symbol = clgv;
+ _symbols.push_back(info);
+ }
+}
+
+/// addObjCCategory - Parse i386/ppc ObjC category data structure.
+void LTOModule::addObjCCategory(const GlobalVariable *clgv) {
+ const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
+ if (!c) return;
+
+ // second slot in __OBJC,__category is pointer to target class name
+ std::string targetclassName;
+ if (!objcClassNameFromExpression(c->getOperand(1), targetclassName))
+ return;
+
+ NameAndAttributes info;
+ StringMap<NameAndAttributes>::value_type &entry =
+ _undefines.GetOrCreateValue(targetclassName);
+
+ if (entry.getValue().name)
+ return;
+
+ const char *symbolName = entry.getKey().data();
+ info.name = symbolName;
+ info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
+ info.isFunction = false;
+ info.symbol = clgv;
+ entry.setValue(info);
+}
+
+/// addObjCClassRef - Parse i386/ppc ObjC class list data structure.
+void LTOModule::addObjCClassRef(const GlobalVariable *clgv) {
+ std::string targetclassName;
+ if (!objcClassNameFromExpression(clgv->getInitializer(), targetclassName))
+ return;
+
+ NameAndAttributes info;
+ StringMap<NameAndAttributes>::value_type &entry =
+ _undefines.GetOrCreateValue(targetclassName);
+ if (entry.getValue().name)
+ return;
+
+ const char *symbolName = entry.getKey().data();
+ info.name = symbolName;
+ info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
+ info.isFunction = false;
+ info.symbol = clgv;
+ entry.setValue(info);
+}
+
+/// addDefinedDataSymbol - Add a data symbol as defined to the list.
+void LTOModule::addDefinedDataSymbol(const GlobalValue *v) {
+ // Add to list of defined symbols.
+ addDefinedSymbol(v, false);
+
+ if (!v->hasSection() /* || !isTargetDarwin */)
+ return;
+
+ // Special case i386/ppc ObjC data structures in magic sections:
+ // The issue is that the old ObjC object format did some strange
+ // contortions to avoid real linker symbols. For instance, the
+ // ObjC class data structure is allocated statically in the executable
+ // that defines that class. That data structures contains a pointer to
+ // its superclass. But instead of just initializing that part of the
+ // struct to the address of its superclass, and letting the static and
+ // dynamic linkers do the rest, the runtime works by having that field
+ // instead point to a C-string that is the name of the superclass.
+ // At runtime the objc initialization updates that pointer and sets
+ // it to point to the actual super class. As far as the linker
+ // knows it is just a pointer to a string. But then someone wanted the
+ // linker to issue errors at build time if the superclass was not found.
+ // So they figured out a way in mach-o object format to use an absolute
+ // symbols (.objc_class_name_Foo = 0) and a floating reference
+ // (.reference .objc_class_name_Bar) to cause the linker into erroring when
+ // a class was missing.
+ // The following synthesizes the implicit .objc_* symbols for the linker
+ // from the ObjC data structures generated by the front end.
+
+ // special case if this data blob is an ObjC class definition
+ if (v->getSection().compare(0, 15, "__OBJC,__class,") == 0) {
+ if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
+ addObjCClass(gv);
+ }
+ }
+
+ // special case if this data blob is an ObjC category definition
+ else if (v->getSection().compare(0, 18, "__OBJC,__category,") == 0) {
+ if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
+ addObjCCategory(gv);
+ }
+ }
+
+ // special case if this data blob is the list of referenced classes
+ else if (v->getSection().compare(0, 18, "__OBJC,__cls_refs,") == 0) {
+ if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
+ addObjCClassRef(gv);
+ }
+ }
+}
+
+/// addDefinedFunctionSymbol - Add a function symbol as defined to the list.
+void LTOModule::addDefinedFunctionSymbol(const Function *f) {
+ // add to list of defined symbols
+ addDefinedSymbol(f, true);
+}
+
+/// addDefinedSymbol - Add a defined symbol to the list.
+void LTOModule::addDefinedSymbol(const GlobalValue *def, bool isFunction) {
+ // ignore all llvm.* symbols
+ if (def->getName().startswith("llvm."))
+ return;
+
+ // string is owned by _defines
+ SmallString<64> Buffer;
+ _mangler.getNameWithPrefix(Buffer, def, false);
+
+ // set alignment part log2() can have rounding errors
+ uint32_t align = def->getAlignment();
+ uint32_t attr = align ? countTrailingZeros(def->getAlignment()) : 0;
+
+ // set permissions part
+ if (isFunction) {
+ attr |= LTO_SYMBOL_PERMISSIONS_CODE;
+ } else {
+ const GlobalVariable *gv = dyn_cast<GlobalVariable>(def);
+ if (gv && gv->isConstant())
+ attr |= LTO_SYMBOL_PERMISSIONS_RODATA;
+ else
+ attr |= LTO_SYMBOL_PERMISSIONS_DATA;
+ }
+
+ // set definition part
+ if (def->hasWeakLinkage() || def->hasLinkOnceLinkage() ||
+ def->hasLinkerPrivateWeakLinkage())
+ attr |= LTO_SYMBOL_DEFINITION_WEAK;
+ else if (def->hasCommonLinkage())
+ attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
+ else
+ attr |= LTO_SYMBOL_DEFINITION_REGULAR;
+
+ // set scope part
+ if (def->hasHiddenVisibility())
+ attr |= LTO_SYMBOL_SCOPE_HIDDEN;
+ else if (def->hasProtectedVisibility())
+ attr |= LTO_SYMBOL_SCOPE_PROTECTED;
+ else if (def->hasExternalLinkage() || def->hasWeakLinkage() ||
+ def->hasLinkOnceLinkage() || def->hasCommonLinkage() ||
+ def->hasLinkerPrivateWeakLinkage())
+ attr |= LTO_SYMBOL_SCOPE_DEFAULT;
+ else if (def->hasLinkOnceODRAutoHideLinkage())
+ attr |= LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN;
+ else
+ attr |= LTO_SYMBOL_SCOPE_INTERNAL;
+
+ StringSet::value_type &entry = _defines.GetOrCreateValue(Buffer);
+ entry.setValue(1);
+
+ // fill information structure
+ NameAndAttributes info;
+ StringRef Name = entry.getKey();
+ info.name = Name.data();
+ assert(info.name[Name.size()] == '\0');
+ info.attributes = attr;
+ info.isFunction = isFunction;
+ info.symbol = def;
+
+ // add to table of symbols
+ _symbols.push_back(info);
+}
+
+/// addAsmGlobalSymbol - Add a global symbol from module-level ASM to the
+/// defined list.
+void LTOModule::addAsmGlobalSymbol(const char *name,
+ lto_symbol_attributes scope) {
+ StringSet::value_type &entry = _defines.GetOrCreateValue(name);
+
+ // only add new define if not already defined
+ if (entry.getValue())
+ return;
+
+ entry.setValue(1);
+
+ NameAndAttributes &info = _undefines[entry.getKey().data()];
+
+ if (info.symbol == 0) {
+ // FIXME: This is trying to take care of module ASM like this:
+ //
+ // module asm ".zerofill __FOO, __foo, _bar_baz_qux, 0"
+ //
+ // but is gross and its mother dresses it funny. Have the ASM parser give us
+ // more details for this type of situation so that we're not guessing so
+ // much.
+
+ // fill information structure
+ info.name = entry.getKey().data();
+ info.attributes =
+ LTO_SYMBOL_PERMISSIONS_DATA | LTO_SYMBOL_DEFINITION_REGULAR | scope;
+ info.isFunction = false;
+ info.symbol = 0;
+
+ // add to table of symbols
+ _symbols.push_back(info);
+ return;
+ }
+
+ if (info.isFunction)
+ addDefinedFunctionSymbol(cast<Function>(info.symbol));
+ else
+ addDefinedDataSymbol(info.symbol);
+
+ _symbols.back().attributes &= ~LTO_SYMBOL_SCOPE_MASK;
+ _symbols.back().attributes |= scope;
+}
+
+/// addAsmGlobalSymbolUndef - Add a global symbol from module-level ASM to the
+/// undefined list.
+void LTOModule::addAsmGlobalSymbolUndef(const char *name) {
+ StringMap<NameAndAttributes>::value_type &entry =
+ _undefines.GetOrCreateValue(name);
+
+ _asm_undefines.push_back(entry.getKey().data());
+
+ // we already have the symbol
+ if (entry.getValue().name)
+ return;
+
+ uint32_t attr = LTO_SYMBOL_DEFINITION_UNDEFINED;;
+ attr |= LTO_SYMBOL_SCOPE_DEFAULT;
+ NameAndAttributes info;
+ info.name = entry.getKey().data();
+ info.attributes = attr;
+ info.isFunction = false;
+ info.symbol = 0;
+
+ entry.setValue(info);
+}
+
+/// addPotentialUndefinedSymbol - Add a symbol which isn't defined just yet to a
+/// list to be resolved later.
+void
+LTOModule::addPotentialUndefinedSymbol(const GlobalValue *decl, bool isFunc) {
+ // ignore all llvm.* symbols
+ if (decl->getName().startswith("llvm."))
+ return;
+
+ // ignore all aliases
+ if (isa<GlobalAlias>(decl))
+ return;
+
+ SmallString<64> name;
+ _mangler.getNameWithPrefix(name, decl, false);
+
+ StringMap<NameAndAttributes>::value_type &entry =
+ _undefines.GetOrCreateValue(name);
+
+ // we already have the symbol
+ if (entry.getValue().name)
+ return;
+
+ NameAndAttributes info;
+
+ info.name = entry.getKey().data();
+
+ if (decl->hasExternalWeakLinkage())
+ info.attributes = LTO_SYMBOL_DEFINITION_WEAKUNDEF;
+ else
+ info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
+
+ info.isFunction = isFunc;
+ info.symbol = decl;
+
+ entry.setValue(info);
+}
+
+namespace {
+ class RecordStreamer : public MCStreamer {
+ public:
+ enum State { NeverSeen, Global, Defined, DefinedGlobal, Used };
+
+ private:
+ StringMap<State> Symbols;
+
+ void markDefined(const MCSymbol &Symbol) {
+ State &S = Symbols[Symbol.getName()];
+ switch (S) {
+ case DefinedGlobal:
+ case Global:
+ S = DefinedGlobal;
+ break;
+ case NeverSeen:
+ case Defined:
+ case Used:
+ S = Defined;
+ break;
+ }
+ }
+ void markGlobal(const MCSymbol &Symbol) {
+ State &S = Symbols[Symbol.getName()];
+ switch (S) {
+ case DefinedGlobal:
+ case Defined:
+ S = DefinedGlobal;
+ break;
+
+ case NeverSeen:
+ case Global:
+ case Used:
+ S = Global;
+ break;
+ }
+ }
+ void markUsed(const MCSymbol &Symbol) {
+ State &S = Symbols[Symbol.getName()];
+ switch (S) {
+ case DefinedGlobal:
+ case Defined:
+ case Global:
+ break;
+
+ case NeverSeen:
+ case Used:
+ S = Used;
+ break;
+ }
+ }
+
+ // FIXME: mostly copied for the obj streamer.
+ void AddValueSymbols(const MCExpr *Value) {
+ switch (Value->getKind()) {
+ case MCExpr::Target:
+ // FIXME: What should we do in here?
+ break;
+
+ case MCExpr::Constant:
+ break;
+
+ case MCExpr::Binary: {
+ const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
+ AddValueSymbols(BE->getLHS());
+ AddValueSymbols(BE->getRHS());
+ break;
+ }
+
+ case MCExpr::SymbolRef:
+ markUsed(cast<MCSymbolRefExpr>(Value)->getSymbol());
+ break;
+
+ case MCExpr::Unary:
+ AddValueSymbols(cast<MCUnaryExpr>(Value)->getSubExpr());
+ break;
+ }
+ }
+
+ public:
+ typedef StringMap<State>::const_iterator const_iterator;
+
+ const_iterator begin() {
+ return Symbols.begin();
+ }
+
+ const_iterator end() {
+ return Symbols.end();
+ }
+
+ RecordStreamer(MCContext &Context)
+ : MCStreamer(SK_RecordStreamer, Context) {}
+
+ virtual void EmitInstruction(const MCInst &Inst) {
+ // Scan for values.
+ for (unsigned i = Inst.getNumOperands(); i--; )
+ if (Inst.getOperand(i).isExpr())
+ AddValueSymbols(Inst.getOperand(i).getExpr());
+ }
+ virtual void EmitLabel(MCSymbol *Symbol) {
+ Symbol->setSection(*getCurrentSection().first);
+ markDefined(*Symbol);
+ }
+ virtual void EmitDebugLabel(MCSymbol *Symbol) {
+ EmitLabel(Symbol);
+ }
+ virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
+ // FIXME: should we handle aliases?
+ markDefined(*Symbol);
+ }
+ virtual bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) {
+ if (Attribute == MCSA_Global)
+ markGlobal(*Symbol);
+ return true;
+ }
+ virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
+ uint64_t Size , unsigned ByteAlignment) {
+ markDefined(*Symbol);
+ }
+ virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) {
+ markDefined(*Symbol);
+ }
+
+ virtual void EmitBundleAlignMode(unsigned AlignPow2) {}
+ virtual void EmitBundleLock(bool AlignToEnd) {}
+ virtual void EmitBundleUnlock() {}
+
+ // Noop calls.
+ virtual void ChangeSection(const MCSection *Section,
+ const MCExpr *Subsection) {}
+ virtual void InitToTextSection() {}
+ virtual void InitSections() {}
+ virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) {}
+ virtual void EmitThumbFunc(MCSymbol *Func) {}
+ virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
+ virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
+ virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
+ virtual void EmitCOFFSymbolStorageClass(int StorageClass) {}
+ virtual void EmitCOFFSymbolType(int Type) {}
+ virtual void EndCOFFSymbolDef() {}
+ virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
+ virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) {}
+ virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
+ uint64_t Size, unsigned ByteAlignment) {}
+ virtual void EmitBytes(StringRef Data) {}
+ virtual void EmitValueImpl(const MCExpr *Value, unsigned Size) {}
+ virtual void EmitULEB128Value(const MCExpr *Value) {}
+ virtual void EmitSLEB128Value(const MCExpr *Value) {}
+ virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
+ unsigned ValueSize,
+ unsigned MaxBytesToEmit) {}
+ virtual void EmitCodeAlignment(unsigned ByteAlignment,
+ unsigned MaxBytesToEmit) {}
+ virtual bool EmitValueToOffset(const MCExpr *Offset,
+ unsigned char Value ) { return false; }
+ virtual void EmitFileDirective(StringRef Filename) {}
+ virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
+ const MCSymbol *LastLabel,
+ const MCSymbol *Label,
+ unsigned PointerSize) {}
+ virtual void FinishImpl() {}
+ virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
+ RecordProcEnd(Frame);
+ }
+
+ static bool classof(const MCStreamer *S) {
+ return S->getKind() == SK_RecordStreamer;
+ }
+ };
+} // end anonymous namespace
+
+/// addAsmGlobalSymbols - Add global symbols from module-level ASM to the
+/// defined or undefined lists.
+bool LTOModule::addAsmGlobalSymbols(std::string &errMsg) {
+ const std::string &inlineAsm = _module->getModuleInlineAsm();
+ if (inlineAsm.empty())
+ return false;
+
+ OwningPtr<RecordStreamer> Streamer(new RecordStreamer(_context));
+ MemoryBuffer *Buffer = MemoryBuffer::getMemBuffer(inlineAsm);
+ SourceMgr SrcMgr;
+ SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
+ OwningPtr<MCAsmParser> Parser(createMCAsmParser(SrcMgr,
+ _context, *Streamer,
+ *_target->getMCAsmInfo()));
+ const Target &T = _target->getTarget();
+ OwningPtr<MCInstrInfo> MCII(T.createMCInstrInfo());
+ OwningPtr<MCSubtargetInfo>
+ STI(T.createMCSubtargetInfo(_target->getTargetTriple(),
+ _target->getTargetCPU(),
+ _target->getTargetFeatureString()));
+ OwningPtr<MCTargetAsmParser> TAP(T.createMCAsmParser(*STI, *Parser.get(), *MCII));
+ if (!TAP) {
+ errMsg = "target " + std::string(T.getName()) +
+ " does not define AsmParser.";
+ return true;
+ }
+
+ Parser->setTargetParser(*TAP);
+ if (Parser->Run(false))
+ return true;
+
+ for (RecordStreamer::const_iterator i = Streamer->begin(),
+ e = Streamer->end(); i != e; ++i) {
+ StringRef Key = i->first();
+ RecordStreamer::State Value = i->second;
+ if (Value == RecordStreamer::DefinedGlobal)
+ addAsmGlobalSymbol(Key.data(), LTO_SYMBOL_SCOPE_DEFAULT);
+ else if (Value == RecordStreamer::Defined)
+ addAsmGlobalSymbol(Key.data(), LTO_SYMBOL_SCOPE_INTERNAL);
+ else if (Value == RecordStreamer::Global ||
+ Value == RecordStreamer::Used)
+ addAsmGlobalSymbolUndef(Key.data());
+ }
+
+ return false;
+}
+
+/// isDeclaration - Return 'true' if the global value is a declaration.
+static bool isDeclaration(const GlobalValue &V) {
+ if (V.hasAvailableExternallyLinkage())
+ return true;
+
+ if (V.isMaterializable())
+ return false;
+
+ return V.isDeclaration();
+}
+
+/// parseSymbols - Parse the symbols from the module and model-level ASM and add
+/// them to either the defined or undefined lists.
+bool LTOModule::parseSymbols(std::string &errMsg) {
+ // add functions
+ for (Module::iterator f = _module->begin(), e = _module->end(); f != e; ++f) {
+ if (isDeclaration(*f))
+ addPotentialUndefinedSymbol(f, true);
+ else
+ addDefinedFunctionSymbol(f);
+ }
+
+ // add data
+ for (Module::global_iterator v = _module->global_begin(),
+ e = _module->global_end(); v != e; ++v) {
+ if (isDeclaration(*v))
+ addPotentialUndefinedSymbol(v, false);
+ else
+ addDefinedDataSymbol(v);
+ }
+
+ // add asm globals
+ if (addAsmGlobalSymbols(errMsg))
+ return true;
+
+ // add aliases
+ for (Module::alias_iterator a = _module->alias_begin(),
+ e = _module->alias_end(); a != e; ++a) {
+ if (isDeclaration(*a->getAliasedGlobal()))
+ // Is an alias to a declaration.
+ addPotentialUndefinedSymbol(a, false);
+ else
+ addDefinedDataSymbol(a);
+ }
+
+ // make symbols for all undefines
+ for (StringMap<NameAndAttributes>::iterator u =_undefines.begin(),
+ e = _undefines.end(); u != e; ++u) {
+ // If this symbol also has a definition, then don't make an undefine because
+ // it is a tentative definition.
+ if (_defines.count(u->getKey())) continue;
+ NameAndAttributes info = u->getValue();
+ _symbols.push_back(info);
+ }
+
+ return false;
+}
diff --git a/lib/LTO/Makefile b/lib/LTO/Makefile
new file mode 100644
index 0000000..7ca125a
--- /dev/null
+++ b/lib/LTO/Makefile
@@ -0,0 +1,15 @@
+##===- lib/Linker/Makefile ---------------------------------*- Makefile -*-===##
+#
+# The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../..
+LIBRARYNAME = LLVMLTO
+BUILD_ARCHIVE := 1
+
+include $(LEVEL)/Makefile.common
+