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Diffstat (limited to 'contrib/llvm/lib/Target/TargetMachine.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/TargetMachine.cpp | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/TargetMachine.cpp b/contrib/llvm/lib/Target/TargetMachine.cpp new file mode 100644 index 0000000..e728251 --- /dev/null +++ b/contrib/llvm/lib/Target/TargetMachine.cpp @@ -0,0 +1,190 @@ +//===-- 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/MC/MCAsmInfo.h" +#include "llvm/MC/MCCodeGenInfo.h" +#include "llvm/Support/CommandLine.h" +using namespace llvm; + +//--------------------------------------------------------------------------- +// Command-line options that tend to be useful on more than one back-end. +// + +namespace llvm { + bool HasDivModLibcall; + bool AsmVerbosityDefault(false); +} + +static cl::opt<bool> +DataSections("fdata-sections", + cl::desc("Emit data into separate sections"), + cl::init(false)); +static cl::opt<bool> +FunctionSections("ffunction-sections", + cl::desc("Emit functions into separate sections"), + cl::init(false)); + +//--------------------------------------------------------------------------- +// 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(0), AsmInfo(0), + MCRelaxAll(false), + MCNoExecStack(false), + MCSaveTempLabels(false), + MCUseLoc(true), + MCUseCFI(true), + MCUseDwarfDirectory(false), + Options(Options) { +} + +TargetMachine::~TargetMachine() { + delete CodeGenInfo; + 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(NoFramePointerElimNonLeaf, "no-frame-pointer-elim-non-leaf"); + 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 { + 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 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<GlobalAlias>(GV)) + GV = GA->resolveAliasedGlobal(false); + const GlobalVariable *Var = cast<GlobalVariable>(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 { + if (!CodeGenInfo) + return CodeGenOpt::Default; + return CodeGenInfo->getOptLevel(); +} + +bool TargetMachine::getAsmVerbosityDefault() { + return AsmVerbosityDefault; +} + +void TargetMachine::setAsmVerbosityDefault(bool V) { + AsmVerbosityDefault = V; +} + +bool TargetMachine::getFunctionSections() { + return FunctionSections; +} + +bool TargetMachine::getDataSections() { + return DataSections; +} + +void TargetMachine::setFunctionSections(bool V) { + FunctionSections = V; +} + +void TargetMachine::setDataSections(bool V) { + DataSections = V; +} |
