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205 lines
7.0 KiB
C++
205 lines
7.0 KiB
C++
//===-- TargetMachine.cpp - General Target Information ---------------------==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file describes the general parts of a Target machine.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/GlobalAlias.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCCodeGenInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCTargetOptions.h"
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#include "llvm/MC/SectionKind.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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using namespace llvm;
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//---------------------------------------------------------------------------
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// TargetMachine Class
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//
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TargetMachine::TargetMachine(const Target &T,
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StringRef TT, StringRef CPU, StringRef FS,
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const TargetOptions &Options)
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: TheTarget(T), TargetTriple(TT), TargetCPU(CPU), TargetFS(FS),
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CodeGenInfo(nullptr), AsmInfo(nullptr),
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RequireStructuredCFG(false),
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Options(Options) {
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}
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TargetMachine::~TargetMachine() {
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delete CodeGenInfo;
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delete AsmInfo;
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}
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/// \brief Reset the target options based on the function's attributes.
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void TargetMachine::resetTargetOptions(const MachineFunction *MF) const {
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const Function *F = MF->getFunction();
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TargetOptions &TO = MF->getTarget().Options;
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#define RESET_OPTION(X, Y) \
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do { \
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if (F->hasFnAttribute(Y)) \
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TO.X = \
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(F->getAttributes(). \
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getAttribute(AttributeSet::FunctionIndex, \
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Y).getValueAsString() == "true"); \
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} while (0)
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RESET_OPTION(NoFramePointerElim, "no-frame-pointer-elim");
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RESET_OPTION(LessPreciseFPMADOption, "less-precise-fpmad");
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RESET_OPTION(UnsafeFPMath, "unsafe-fp-math");
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RESET_OPTION(NoInfsFPMath, "no-infs-fp-math");
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RESET_OPTION(NoNaNsFPMath, "no-nans-fp-math");
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RESET_OPTION(UseSoftFloat, "use-soft-float");
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RESET_OPTION(DisableTailCalls, "disable-tail-calls");
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TO.MCOptions.SanitizeAddress = F->hasFnAttribute(Attribute::SanitizeAddress);
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}
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/// getRelocationModel - Returns the code generation relocation model. The
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/// choices are static, PIC, and dynamic-no-pic, and target default.
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Reloc::Model TargetMachine::getRelocationModel() const {
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if (!CodeGenInfo)
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return Reloc::Default;
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return CodeGenInfo->getRelocationModel();
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}
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/// getCodeModel - Returns the code model. The choices are small, kernel,
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/// medium, large, and target default.
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CodeModel::Model TargetMachine::getCodeModel() const {
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if (!CodeGenInfo)
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return CodeModel::Default;
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return CodeGenInfo->getCodeModel();
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}
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/// Get the IR-specified TLS model for Var.
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static TLSModel::Model getSelectedTLSModel(const GlobalVariable *Var) {
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switch (Var->getThreadLocalMode()) {
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case GlobalVariable::NotThreadLocal:
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llvm_unreachable("getSelectedTLSModel for non-TLS variable");
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break;
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case GlobalVariable::GeneralDynamicTLSModel:
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return TLSModel::GeneralDynamic;
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case GlobalVariable::LocalDynamicTLSModel:
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return TLSModel::LocalDynamic;
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case GlobalVariable::InitialExecTLSModel:
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return TLSModel::InitialExec;
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case GlobalVariable::LocalExecTLSModel:
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return TLSModel::LocalExec;
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}
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llvm_unreachable("invalid TLS model");
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}
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TLSModel::Model TargetMachine::getTLSModel(const GlobalValue *GV) const {
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// If GV is an alias then use the aliasee for determining
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// thread-localness.
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if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
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GV = GA->getAliasee();
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const GlobalVariable *Var = cast<GlobalVariable>(GV);
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bool isLocal = Var->hasLocalLinkage();
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bool isDeclaration = Var->isDeclaration();
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bool isPIC = getRelocationModel() == Reloc::PIC_;
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bool isPIE = Options.PositionIndependentExecutable;
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// FIXME: what should we do for protected and internal visibility?
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// For variables, is internal different from hidden?
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bool isHidden = Var->hasHiddenVisibility();
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TLSModel::Model Model;
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if (isPIC && !isPIE) {
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if (isLocal || isHidden)
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Model = TLSModel::LocalDynamic;
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else
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Model = TLSModel::GeneralDynamic;
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} else {
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if (!isDeclaration || isHidden)
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Model = TLSModel::LocalExec;
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else
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Model = TLSModel::InitialExec;
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}
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// If the user specified a more specific model, use that.
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TLSModel::Model SelectedModel = getSelectedTLSModel(Var);
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if (SelectedModel > Model)
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return SelectedModel;
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return Model;
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}
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/// getOptLevel - Returns the optimization level: None, Less,
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/// Default, or Aggressive.
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CodeGenOpt::Level TargetMachine::getOptLevel() const {
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if (!CodeGenInfo)
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return CodeGenOpt::Default;
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return CodeGenInfo->getOptLevel();
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}
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void TargetMachine::setOptLevel(CodeGenOpt::Level Level) const {
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if (CodeGenInfo)
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CodeGenInfo->setOptLevel(Level);
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}
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bool TargetMachine::getAsmVerbosityDefault() const {
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return Options.MCOptions.AsmVerbose;
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}
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void TargetMachine::setAsmVerbosityDefault(bool V) {
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Options.MCOptions.AsmVerbose = V;
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}
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bool TargetMachine::getFunctionSections() const {
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return Options.FunctionSections;
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}
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bool TargetMachine::getDataSections() const {
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return Options.DataSections;
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}
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void TargetMachine::setFunctionSections(bool V) {
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Options.FunctionSections = V;
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}
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void TargetMachine::setDataSections(bool V) {
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Options.DataSections = V;
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}
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void TargetMachine::getNameWithPrefix(SmallVectorImpl<char> &Name,
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const GlobalValue *GV, Mangler &Mang,
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bool MayAlwaysUsePrivate) const {
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if (MayAlwaysUsePrivate || !GV->hasPrivateLinkage()) {
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// Simple case: If GV is not private, it is not important to find out if
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// private labels are legal in this case or not.
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Mang.getNameWithPrefix(Name, GV, false);
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return;
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}
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SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, *this);
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const TargetLoweringObjectFile &TLOF =
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getTargetLowering()->getObjFileLowering();
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const MCSection *TheSection = TLOF.SectionForGlobal(GV, GVKind, Mang, *this);
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bool CannotUsePrivateLabel = TLOF.isSectionAtomizableBySymbols(*TheSection);
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Mang.getNameWithPrefix(Name, GV, CannotUsePrivateLabel);
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}
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MCSymbol *TargetMachine::getSymbol(const GlobalValue *GV, Mangler &Mang) const {
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SmallString<60> NameStr;
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getNameWithPrefix(NameStr, GV, Mang);
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const TargetLoweringObjectFile &TLOF =
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getTargetLowering()->getObjFileLowering();
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return TLOF.getContext().GetOrCreateSymbol(NameStr.str());
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}
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