diff options
Diffstat (limited to 'contrib/llvm/lib/Target/TargetMachine.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/TargetMachine.cpp | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/TargetMachine.cpp b/contrib/llvm/lib/Target/TargetMachine.cpp new file mode 100644 index 000000000000..b3ff0010c434 --- /dev/null +++ b/contrib/llvm/lib/Target/TargetMachine.cpp @@ -0,0 +1,209 @@ +//===-- TargetMachine.cpp - General Target Information ---------------------==// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file describes the general parts of a Target machine. +// +//===----------------------------------------------------------------------===// + +#include "llvm/Target/TargetMachine.h" +#include "llvm/CodeGen/MachineFunction.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/MC/MCCodeGenInfo.h" +#include "llvm/MC/MCContext.h" +#include "llvm/MC/MCSectionMachO.h" +#include "llvm/MC/MCTargetOptions.h" +#include "llvm/MC/SectionKind.h" +#include "llvm/Support/CommandLine.h" +#include "llvm/Target/TargetLowering.h" +#include "llvm/Target/TargetLoweringObjectFile.h" +#include "llvm/Target/TargetSubtargetInfo.h" +using namespace llvm; + +//--------------------------------------------------------------------------- +// TargetMachine Class +// + +TargetMachine::TargetMachine(const Target &T, + StringRef TT, StringRef CPU, StringRef FS, + const TargetOptions &Options) + : TheTarget(T), TargetTriple(TT), TargetCPU(CPU), TargetFS(FS), + CodeGenInfo(nullptr), AsmInfo(nullptr), + RequireStructuredCFG(false), + Options(Options) { +} + +TargetMachine::~TargetMachine() { + delete CodeGenInfo; + delete AsmInfo; +} + +/// \brief Reset the target options based on the function's attributes. +void TargetMachine::resetTargetOptions(const Function &F) const { +#define RESET_OPTION(X, Y) \ + do { \ + if (F.hasFnAttribute(Y)) \ + Options.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"); + + Options.MCOptions.SanitizeAddress = F.hasFnAttribute(Attribute::SanitizeAddress); +} + +/// getRelocationModel - Returns the code generation relocation model. The +/// choices are static, PIC, and dynamic-no-pic, and target default. +Reloc::Model TargetMachine::getRelocationModel() const { + if (!CodeGenInfo) + return Reloc::Default; + return CodeGenInfo->getRelocationModel(); +} + +/// getCodeModel - Returns the code model. The choices are small, kernel, +/// medium, large, and target default. +CodeModel::Model TargetMachine::getCodeModel() const { + if (!CodeGenInfo) + return CodeModel::Default; + return CodeGenInfo->getCodeModel(); +} + +/// Get the IR-specified TLS model for Var. +static TLSModel::Model getSelectedTLSModel(const GlobalValue *GV) { + switch (GV->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 { + bool isLocal = GV->hasLocalLinkage(); + bool isDeclaration = GV->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 = GV->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(GV); + if (SelectedModel > Model) + return SelectedModel; + + return Model; +} + +/// getOptLevel - Returns the optimization level: None, Less, +/// Default, or Aggressive. +CodeGenOpt::Level TargetMachine::getOptLevel() const { + if (!CodeGenInfo) + return CodeGenOpt::Default; + return CodeGenInfo->getOptLevel(); +} + +void TargetMachine::setOptLevel(CodeGenOpt::Level Level) const { + if (CodeGenInfo) + CodeGenInfo->setOptLevel(Level); +} + +bool TargetMachine::getAsmVerbosityDefault() const { + return Options.MCOptions.AsmVerbose; +} + +void TargetMachine::setAsmVerbosityDefault(bool V) { + Options.MCOptions.AsmVerbose = V; +} + +bool TargetMachine::getFunctionSections() const { + return Options.FunctionSections; +} + +bool TargetMachine::getDataSections() const { + return Options.DataSections; +} + +void TargetMachine::setFunctionSections(bool V) { + Options.FunctionSections = V; +} + +void TargetMachine::setDataSections(bool V) { + Options.DataSections = V; +} + +static bool canUsePrivateLabel(const MCAsmInfo &AsmInfo, + const MCSection &Section) { + if (!AsmInfo.isSectionAtomizableBySymbols(Section)) + return true; + + // If it is not dead stripped, it is safe to use private labels. + const MCSectionMachO &SMO = cast<MCSectionMachO>(Section); + if (SMO.hasAttribute(MachO::S_ATTR_NO_DEAD_STRIP)) + return true; + + return false; +} + +void TargetMachine::getNameWithPrefix(SmallVectorImpl<char> &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; + } + SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, *this); + const TargetLoweringObjectFile &TLOF = + getSubtargetImpl()->getTargetLowering()->getObjFileLowering(); + const MCSection *TheSection = TLOF.SectionForGlobal(GV, GVKind, Mang, *this); + bool CannotUsePrivateLabel = !canUsePrivateLabel(*AsmInfo, *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 = + getSubtargetImpl()->getTargetLowering()->getObjFileLowering(); + return TLOF.getContext().GetOrCreateSymbol(NameStr.str()); +} |