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This allows the user/front-end to specify a model that is better than what LLVM would choose by default. For example, a variable might be declared as @x = thread_local(initialexec) global i32 42 if it will not be used in a shared library that is dlopen'ed. If the specified model isn't supported by the target, or if LLVM can make a better choice, a different model may be used. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159077 91177308-0d34-0410-b5e6-96231b3b80d8
165 lines
4.8 KiB
C++
165 lines
4.8 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/GlobalAlias.h"
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#include "llvm/GlobalValue.h"
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#include "llvm/GlobalVariable.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/Target/TargetMachine.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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//---------------------------------------------------------------------------
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// Command-line options that tend to be useful on more than one back-end.
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//
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namespace llvm {
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bool HasDivModLibcall;
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bool AsmVerbosityDefault(false);
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}
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static cl::opt<bool>
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DataSections("fdata-sections",
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cl::desc("Emit data into separate sections"),
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cl::init(false));
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static cl::opt<bool>
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FunctionSections("ffunction-sections",
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cl::desc("Emit functions into separate sections"),
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cl::init(false));
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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(0), AsmInfo(0),
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MCRelaxAll(false),
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MCNoExecStack(false),
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MCSaveTempLabels(false),
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MCUseLoc(true),
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MCUseCFI(true),
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MCUseDwarfDirectory(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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/// 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->resolveAliasedGlobal(false);
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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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bool TargetMachine::getAsmVerbosityDefault() {
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return AsmVerbosityDefault;
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}
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void TargetMachine::setAsmVerbosityDefault(bool V) {
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AsmVerbosityDefault = V;
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}
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bool TargetMachine::getFunctionSections() {
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return FunctionSections;
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}
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bool TargetMachine::getDataSections() {
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return DataSections;
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}
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void TargetMachine::setFunctionSections(bool V) {
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FunctionSections = V;
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}
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void TargetMachine::setDataSections(bool V) {
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DataSections = V;
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}
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