X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FTargetMachine.cpp;h=f8a58ec2922c26d627f26ea582ee23fbe3382a33;hb=36b699f2b139a30a2dfa4448223d6985b55daa8a;hp=80cc5fa75f96a0adaca7a0b8bc3cea1381a189fe;hpb=8a8d479214745c82ef00f08d4e4f1c173b5f9ce2;p=oota-llvm.git diff --git a/lib/Target/TargetMachine.cpp b/lib/Target/TargetMachine.cpp index 80cc5fa75f9..f8a58ec2922 100644 --- a/lib/Target/TargetMachine.cpp +++ b/lib/Target/TargetMachine.cpp @@ -11,12 +11,20 @@ // //===----------------------------------------------------------------------===// +#include "llvm/Target/TargetMachine.h" #include "llvm/CodeGen/MachineFunction.h" -#include "llvm/CodeGen/MachineFrameInfo.h" +#include "llvm/IR/Function.h" +#include "llvm/IR/GlobalAlias.h" +#include "llvm/IR/GlobalValue.h" +#include "llvm/IR/GlobalVariable.h" +#include "llvm/IR/Mangler.h" #include "llvm/MC/MCAsmInfo.h" -#include "llvm/Target/TargetMachine.h" -#include "llvm/Target/TargetOptions.h" +#include "llvm/MC/MCCodeGenInfo.h" +#include "llvm/MC/MCContext.h" +#include "llvm/MC/SectionKind.h" #include "llvm/Support/CommandLine.h" +#include "llvm/Target/TargetLowering.h" +#include "llvm/Target/TargetLoweringObjectFile.h" using namespace llvm; //--------------------------------------------------------------------------- @@ -24,7 +32,6 @@ using namespace llvm; // namespace llvm { - bool StrongPHIElim; bool HasDivModLibcall; bool AsmVerbosityDefault(false); } @@ -37,7 +44,7 @@ static cl::opt FunctionSections("ffunction-sections", cl::desc("Emit functions into separate sections"), cl::init(false)); - + //--------------------------------------------------------------------------- // TargetMachine Class // @@ -50,9 +57,9 @@ TargetMachine::TargetMachine(const Target &T, MCRelaxAll(false), MCNoExecStack(false), MCSaveTempLabels(false), - MCUseLoc(true), MCUseCFI(true), MCUseDwarfDirectory(false), + RequireStructuredCFG(false), Options(Options) { } @@ -61,6 +68,29 @@ TargetMachine::~TargetMachine() { delete AsmInfo; } +/// \brief Reset the target options based on the function's attributes. +void TargetMachine::resetTargetOptions(const MachineFunction *MF) const { + const Function *F = MF->getFunction(); + TargetOptions &TO = MF->getTarget().Options; + +#define RESET_OPTION(X, Y) \ + do { \ + if (F->hasFnAttribute(Y)) \ + TO.X = \ + (F->getAttributes(). \ + getAttribute(AttributeSet::FunctionIndex, \ + Y).getValueAsString() == "true"); \ + } while (0) + + RESET_OPTION(NoFramePointerElim, "no-frame-pointer-elim"); + RESET_OPTION(LessPreciseFPMADOption, "less-precise-fpmad"); + RESET_OPTION(UnsafeFPMath, "unsafe-fp-math"); + RESET_OPTION(NoInfsFPMath, "no-infs-fp-math"); + RESET_OPTION(NoNaNsFPMath, "no-nans-fp-math"); + RESET_OPTION(UseSoftFloat, "use-soft-float"); + RESET_OPTION(DisableTailCalls, "disable-tail-calls"); +} + /// getRelocationModel - Returns the code generation relocation model. The /// choices are static, PIC, and dynamic-no-pic, and target default. Reloc::Model TargetMachine::getRelocationModel() const { @@ -77,6 +107,60 @@ CodeModel::Model TargetMachine::getCodeModel() const { return CodeGenInfo->getCodeModel(); } +/// Get the IR-specified TLS model for Var. +static TLSModel::Model getSelectedTLSModel(const GlobalVariable *Var) { + switch (Var->getThreadLocalMode()) { + case GlobalVariable::NotThreadLocal: + llvm_unreachable("getSelectedTLSModel for non-TLS variable"); + break; + case GlobalVariable::GeneralDynamicTLSModel: + return TLSModel::GeneralDynamic; + case GlobalVariable::LocalDynamicTLSModel: + return TLSModel::LocalDynamic; + case GlobalVariable::InitialExecTLSModel: + return TLSModel::InitialExec; + case GlobalVariable::LocalExecTLSModel: + return TLSModel::LocalExec; + } + llvm_unreachable("invalid TLS model"); +} + +TLSModel::Model TargetMachine::getTLSModel(const GlobalValue *GV) const { + // If GV is an alias then use the aliasee for determining + // thread-localness. + if (const GlobalAlias *GA = dyn_cast(GV)) + GV = GA->resolveAliasedGlobal(false); + const GlobalVariable *Var = cast(GV); + + bool isLocal = Var->hasLocalLinkage(); + bool isDeclaration = Var->isDeclaration(); + bool isPIC = getRelocationModel() == Reloc::PIC_; + bool isPIE = Options.PositionIndependentExecutable; + // FIXME: what should we do for protected and internal visibility? + // For variables, is internal different from hidden? + bool isHidden = Var->hasHiddenVisibility(); + + TLSModel::Model Model; + if (isPIC && !isPIE) { + if (isLocal || isHidden) + Model = TLSModel::LocalDynamic; + else + Model = TLSModel::GeneralDynamic; + } else { + if (!isDeclaration || isHidden) + Model = TLSModel::LocalExec; + else + Model = TLSModel::InitialExec; + } + + // If the user specified a more specific model, use that. + TLSModel::Model SelectedModel = getSelectedTLSModel(Var); + if (SelectedModel > Model) + return SelectedModel; + + return Model; +} + /// getOptLevel - Returns the optimization level: None, Less, /// Default, or Aggressive. CodeGenOpt::Level TargetMachine::getOptLevel() const { @@ -85,6 +169,11 @@ CodeGenOpt::Level TargetMachine::getOptLevel() const { return CodeGenInfo->getOptLevel(); } +void TargetMachine::setOptLevel(CodeGenOpt::Level Level) const { + if (CodeGenInfo) + CodeGenInfo->setOptLevel(Level); +} + bool TargetMachine::getAsmVerbosityDefault() { return AsmVerbosityDefault; } @@ -109,36 +198,27 @@ void TargetMachine::setDataSections(bool V) { DataSections = V; } -/// DisableFramePointerElim - This returns true if frame pointer elimination -/// optimization should be disabled for the given machine function. -bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const { - // Check to see if we should eliminate non-leaf frame pointers and then - // check to see if we should eliminate all frame pointers. - if (NoFramePointerElimNonLeaf && !NoFramePointerElim) { - const MachineFrameInfo *MFI = MF.getFrameInfo(); - return MFI->hasCalls(); +void TargetMachine::getNameWithPrefix(SmallVectorImpl &Name, + const GlobalValue *GV, Mangler &Mang, + bool MayAlwaysUsePrivate) const { + if (MayAlwaysUsePrivate || !GV->hasPrivateLinkage()) { + // Simple case: If GV is not private, it is not important to find out if + // private labels are legal in this case or not. + Mang.getNameWithPrefix(Name, GV, false); + return; } - - return NoFramePointerElim; -} - -/// LessPreciseFPMAD - This flag return true when -enable-fp-mad option -/// is specified on the command line. When this flag is off(default), the -/// code generator is not allowed to generate mad (multiply add) if the -/// result is "less precise" than doing those operations individually. -bool TargetOptions::LessPreciseFPMAD() const { - return UnsafeFPMath || LessPreciseFPMADOption; -} - -/// HonorSignDependentRoundingFPMath - Return true if the codegen must assume -/// that the rounding mode of the FPU can change from its default. -bool TargetOptions::HonorSignDependentRoundingFPMath() const { - return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption; -} - -/// getTrapFunctionName - If this returns a non-empty string, this means isel -/// should lower Intrinsic::trap to a call to the specified function name -/// instead of an ISD::TRAP node. -StringRef TargetOptions::getTrapFunctionName() const { - return TrapFuncName; + SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, *this); + const TargetLoweringObjectFile &TLOF = + getTargetLowering()->getObjFileLowering(); + const MCSection *TheSection = TLOF.SectionForGlobal(GV, GVKind, Mang, *this); + bool CannotUsePrivateLabel = TLOF.isSectionAtomizableBySymbols(*TheSection); + Mang.getNameWithPrefix(Name, GV, CannotUsePrivateLabel); +} + +MCSymbol *TargetMachine::getSymbol(const GlobalValue *GV, Mangler &Mang) const { + SmallString<60> NameStr; + getNameWithPrefix(NameStr, GV, Mang); + const TargetLoweringObjectFile &TLOF = + getTargetLowering()->getObjFileLowering(); + return TLOF.getContext().GetOrCreateSymbol(NameStr.str()); }