//===----------------------------------------------------------------------===//
#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/CodeGen/RuntimeLibcalls.h"
#include "llvm/Config/config.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/DiagnosticInfo.h"
+#include "llvm/IR/DiagnosticPrinter.h"
#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Mangler.h"
#include "llvm/IR/Module.h"
+#include "llvm/IR/Verifier.h"
#include "llvm/InitializePasses.h"
+#include "llvm/LTO/LTOModule.h"
#include "llvm/Linker.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.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/TargetLibraryInfo.h"
+#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetOptions.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"
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) {
+ CodeModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC),
+ InternalizeStrategy(LTO_INTERNALIZE_FULL), NativeObjectFile(NULL),
+ DiagHandler(NULL), DiagContext(NULL) {
initializeLTOPasses();
}
LTOCodeGenerator::~LTOCodeGenerator() {
delete TargetMach;
delete NativeObjectFile;
- delete Linker.getModule();
+ TargetMach = NULL;
+ NativeObjectFile = NULL;
+
+ Linker.deleteModule();
for (std::vector<char *>::iterator I = CodegenOptions.begin(),
E = CodegenOptions.end();
// Initialize LTO passes. Please keep this funciton in sync with
// PassManagerBuilder::populateLTOPassManager(), and make sure all LTO
-// passes are initialized.
-//
+// passes are initialized.
void LTOCodeGenerator::initializeLTOPasses() {
PassRegistry &R = *PassRegistry::getPassRegistry();
llvm_unreachable("Unknown PIC model!");
}
+void
+LTOCodeGenerator::setInternalizeStrategy(lto_internalize_strategy Strategy) {
+ switch (Strategy) {
+ case LTO_INTERNALIZE_FULL:
+ case LTO_INTERNALIZE_NONE:
+ case LTO_INTERNALIZE_HIDDEN:
+ InternalizeStrategy = Strategy;
+ return;
+ }
+ llvm_unreachable("Unknown internalize strategy!");
+}
+
bool LTOCodeGenerator::writeMergedModules(const char *path,
std::string &errMsg) {
if (!determineTarget(errMsg))
return true;
}
-bool LTOCodeGenerator::compile_to_file(const char** name,
+bool LTOCodeGenerator::compile_to_file(const char** name,
bool disableOpt,
bool disableInline,
bool disableGVNLoadPRE,
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();
void LTOCodeGenerator::
applyRestriction(GlobalValue &GV,
+ const ArrayRef<StringRef> &Libcalls,
std::vector<const char*> &MustPreserveList,
SmallPtrSet<GlobalValue*, 8> &AsmUsed,
Mangler &Mangler) {
- SmallString<64> Buffer;
- Mangler.getNameWithPrefix(Buffer, &GV, false);
-
+ // There are no restrictions to apply to declarations.
if (GV.isDeclaration())
return;
+
+ // There is nothing more restrictive than private linkage.
+ if (GV.hasPrivateLinkage())
+ return;
+
+ SmallString<64> Buffer;
+ TargetMach->getNameWithPrefix(Buffer, &GV, Mangler);
+
if (MustPreserveSymbols.count(Buffer))
MustPreserveList.push_back(GV.getName().data());
if (AsmUndefinedRefs.count(Buffer))
AsmUsed.insert(&GV);
+
+ // Conservatively append user-supplied runtime library functions to
+ // llvm.compiler.used. These could be internalized and deleted by
+ // optimizations like -globalopt, causing problems when later optimizations
+ // add new library calls (e.g., llvm.memset => memset and printf => puts).
+ // Leave it to the linker to remove any dead code (e.g. with -dead_strip).
+ if (isa<Function>(GV) &&
+ std::binary_search(Libcalls.begin(), Libcalls.end(), GV.getName()))
+ AsmUsed.insert(&GV);
}
static void findUsedValues(GlobalVariable *LLVMUsed,
UsedValues.insert(GV);
}
+static void accumulateAndSortLibcalls(std::vector<StringRef> &Libcalls,
+ const TargetLibraryInfo& TLI,
+ const TargetLowering *Lowering)
+{
+ // TargetLibraryInfo has info on C runtime library calls on the current
+ // target.
+ for (unsigned I = 0, E = static_cast<unsigned>(LibFunc::NumLibFuncs);
+ I != E; ++I) {
+ LibFunc::Func F = static_cast<LibFunc::Func>(I);
+ if (TLI.has(F))
+ Libcalls.push_back(TLI.getName(F));
+ }
+
+ // TargetLowering has info on library calls that CodeGen expects to be
+ // available, both from the C runtime and compiler-rt.
+ if (Lowering)
+ for (unsigned I = 0, E = static_cast<unsigned>(RTLIB::UNKNOWN_LIBCALL);
+ I != E; ++I)
+ if (const char *Name
+ = Lowering->getLibcallName(static_cast<RTLIB::Libcall>(I)))
+ Libcalls.push_back(Name);
+
+ array_pod_sort(Libcalls.begin(), Libcalls.end());
+ Libcalls.erase(std::unique(Libcalls.begin(), Libcalls.end()),
+ Libcalls.end());
+}
+
void LTOCodeGenerator::applyScopeRestrictions() {
- if (ScopeRestrictionsDone)
+ if (ScopeRestrictionsDone || !shouldInternalize())
return;
Module *mergedModule = Linker.getModule();
passes.add(createVerifierPass());
// mark which symbols can not be internalized
- MCContext MContext(TargetMach->getMCAsmInfo(), TargetMach->getRegisterInfo(),
- NULL);
- Mangler Mangler(MContext, TargetMach);
+ Mangler Mangler(TargetMach->getDataLayout());
std::vector<const char*> MustPreserveList;
SmallPtrSet<GlobalValue*, 8> AsmUsed;
+ std::vector<StringRef> Libcalls;
+ TargetLibraryInfo TLI(Triple(TargetMach->getTargetTriple()));
+ accumulateAndSortLibcalls(Libcalls, TLI, TargetMach->getTargetLowering());
for (Module::iterator f = mergedModule->begin(),
e = mergedModule->end(); f != e; ++f)
- applyRestriction(*f, MustPreserveList, AsmUsed, Mangler);
+ applyRestriction(*f, Libcalls, MustPreserveList, AsmUsed, Mangler);
for (Module::global_iterator v = mergedModule->global_begin(),
e = mergedModule->global_end(); v != e; ++v)
- applyRestriction(*v, MustPreserveList, AsmUsed, Mangler);
+ applyRestriction(*v, Libcalls, MustPreserveList, AsmUsed, Mangler);
for (Module::alias_iterator a = mergedModule->alias_begin(),
e = mergedModule->alias_end(); a != e; ++a)
- applyRestriction(*a, MustPreserveList, AsmUsed, Mangler);
+ applyRestriction(*a, Libcalls, MustPreserveList, AsmUsed, Mangler);
GlobalVariable *LLVMCompilerUsed =
mergedModule->getGlobalVariable("llvm.compiler.used");
LLVMCompilerUsed->setSection("llvm.metadata");
}
- passes.add(createInternalizePass(MustPreserveList));
+ passes.add(
+ createInternalizePass(MustPreserveList, shouldOnlyInternalizeHidden()));
// apply scope restrictions
passes.run(*mergedModule);
// Add an appropriate DataLayout instance for this module...
passes.add(new DataLayout(*TargetMach->getDataLayout()));
+
+ // Add appropriate TargetLibraryInfo for this module.
+ passes.add(new TargetLibraryInfo(Triple(TargetMach->getTargetTriple())));
+
TargetMach->addAnalysisPasses(passes);
// Enabling internalize here would use its AllButMain variant. It
PassManager codeGenPasses;
codeGenPasses.add(new DataLayout(*TargetMach->getDataLayout()));
- TargetMach->addAnalysisPasses(codeGenPasses);
formatted_raw_ostream Out(out);
CodegenOptions.push_back(strdup(o.first.str().c_str()));
}
}
+
+void LTOCodeGenerator::parseCodeGenDebugOptions() {
+ // if options were requested, set them
+ if (!CodegenOptions.empty())
+ cl::ParseCommandLineOptions(CodegenOptions.size(),
+ const_cast<char **>(&CodegenOptions[0]));
+}
+
+void LTOCodeGenerator::DiagnosticHandler(const DiagnosticInfo &DI,
+ void *Context) {
+ ((LTOCodeGenerator *)Context)->DiagnosticHandler2(DI);
+}
+
+void LTOCodeGenerator::DiagnosticHandler2(const DiagnosticInfo &DI) {
+ // Map the LLVM internal diagnostic severity to the LTO diagnostic severity.
+ lto_codegen_diagnostic_severity_t Severity;
+ switch (DI.getSeverity()) {
+ case DS_Error:
+ Severity = LTO_DS_ERROR;
+ break;
+ case DS_Warning:
+ Severity = LTO_DS_WARNING;
+ break;
+ case DS_Note:
+ Severity = LTO_DS_NOTE;
+ break;
+ }
+ // Create the string that will be reported to the external diagnostic handler.
+ std::string MsgStorage;
+ raw_string_ostream Stream(MsgStorage);
+ DiagnosticPrinterRawOStream DP(Stream);
+ DI.print(DP);
+ Stream.flush();
+
+ // If this method has been called it means someone has set up an external
+ // diagnostic handler. Assert on that.
+ assert(DiagHandler && "Invalid diagnostic handler");
+ (*DiagHandler)(Severity, MsgStorage.c_str(), DiagContext);
+}
+
+void
+LTOCodeGenerator::setDiagnosticHandler(lto_diagnostic_handler_t DiagHandler,
+ void *Ctxt) {
+ this->DiagHandler = DiagHandler;
+ this->DiagContext = Ctxt;
+ if (!DiagHandler)
+ return Context.setDiagnosticHandler(NULL, NULL);
+ // Register the LTOCodeGenerator stub in the LLVMContext to forward the
+ // diagnostic to the external DiagHandler.
+ Context.setDiagnosticHandler(LTOCodeGenerator::DiagnosticHandler, this);
+}
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