//===-- 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.
-// This file also implements MachineInstrInfo and MachineCacheInfo.
//
//===----------------------------------------------------------------------===//
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/MachineInstrInfo.h"
-#include "llvm/Target/MachineCacheInfo.h"
-#include "llvm/CodeGen/PreSelection.h"
-#include "llvm/CodeGen/StackSlots.h"
-#include "llvm/CodeGen/InstrSelection.h"
-#include "llvm/CodeGen/InstrScheduling.h"
-#include "llvm/CodeGen/RegisterAllocation.h"
-#include "llvm/CodeGen/PeepholeOpts.h"
-#include "llvm/CodeGen/MachineCodeForMethod.h"
-#include "llvm/CodeGen/MachineCodeForInstruction.h"
-#include "llvm/Reoptimizer/Mapping/MappingInfo.h"
-#include "llvm/Reoptimizer/Mapping/FInfo.h"
-#include "llvm/Transforms/Scalar.h"
-#include "Support/CommandLine.h"
-#include "llvm/PassManager.h"
-#include "llvm/Function.h"
-#include "llvm/DerivedTypes.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/SectionKind.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Target/TargetLowering.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+using namespace llvm;
//---------------------------------------------------------------------------
-// Command line options to control choice of code generation passes.
-//---------------------------------------------------------------------------
-
-static cl::opt<bool> DisablePreSelect("nopreselect",
- cl::desc("Disable preselection pass"));
+// Command-line options that tend to be useful on more than one back-end.
+//
-static cl::opt<bool> DisableSched("nosched",
- cl::desc("Disable local scheduling pass"));
+namespace llvm {
+ bool HasDivModLibcall;
+ bool AsmVerbosityDefault(false);
+}
-static cl::opt<bool> DisablePeephole("nopeephole",
- cl::desc("Disable peephole optimization pass"));
+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));
//---------------------------------------------------------------------------
-// class TargetMachine
-//
-// Purpose:
-// Machine description.
-//
-//---------------------------------------------------------------------------
-
-
-// function TargetMachine::findOptimalStorageSize
-//
-// Purpose:
-// This default implementation assumes that all sub-word data items use
-// space equal to optSizeForSubWordData, and all other primitive data
-// items use space according to the type.
-//
-unsigned int
-TargetMachine::findOptimalStorageSize(const Type* ty) const
-{
- switch(ty->getPrimitiveID())
- {
- case Type::BoolTyID:
- case Type::UByteTyID:
- case Type::SByteTyID:
- case Type::UShortTyID:
- case Type::ShortTyID:
- return optSizeForSubWordData;
-
- default:
- return DataLayout.getTypeSize(ty);
- }
-}
-
-
-//===---------------------------------------------------------------------===//
-// Default code generation passes.
-//
-// Native code generation for a specified target.
-//===---------------------------------------------------------------------===//
-
-class ConstructMachineCodeForFunction : public FunctionPass {
- TargetMachine &Target;
-public:
- inline ConstructMachineCodeForFunction(TargetMachine &T) : Target(T) {}
-
- const char *getPassName() const {
- return "ConstructMachineCodeForFunction";
- }
-
- bool runOnFunction(Function &F) {
- MachineCodeForMethod::construct(&F, Target);
- return false;
- }
-};
-
-struct FreeMachineCodeForFunction : public FunctionPass {
- const char *getPassName() const { return "FreeMachineCodeForFunction"; }
-
- static void freeMachineCode(Instruction &I) {
- MachineCodeForInstruction::destroy(&I);
- }
-
- bool runOnFunction(Function &F) {
- for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI)
- for (BasicBlock::iterator I = FI->begin(), E = FI->end(); I != E; ++I)
- MachineCodeForInstruction::get(I).dropAllReferences();
-
- for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI)
- for_each(FI->begin(), FI->end(), freeMachineCode);
-
- return false;
- }
-};
-
-// addPassesToEmitAssembly - This method controls the entire code generation
-// process for the ultra sparc.
+// TargetMachine Class
//
-void
-TargetMachine::addPassesToEmitAssembly(PassManager &PM, std::ostream &Out)
-{
- // Construct and initialize the MachineCodeForMethod object for this fn.
- PM.add(new ConstructMachineCodeForFunction(*this));
- //Insert empty stackslots in the stack frame of each function
- //so %fp+offset-8 and %fp+offset-16 are empty slots now!
- PM.add(createStackSlotsPass(*this));
+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),
+ MCUseCFI(true),
+ MCUseDwarfDirectory(false),
+ RequireStructuredCFG(false),
+ Options(Options) {
+}
- // Specialize LLVM code for this target machine and then
- // run basic dataflow optimizations on LLVM code.
- if (!DisablePreSelect)
- {
- PM.add(createPreSelectionPass(*this));
- /* PM.add(createReassociatePass()); */
- PM.add(createLICMPass());
- PM.add(createGCSEPass());
- }
+TargetMachine::~TargetMachine() {
+ delete CodeGenInfo;
+ delete AsmInfo;
+}
- PM.add(createInstructionSelectionPass(*this));
+/// \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");
+}
- if (!DisableSched)
- PM.add(createInstructionSchedulingWithSSAPass(*this));
+/// 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();
+}
- PM.add(getRegisterAllocator(*this));
+/// 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();
+}
- PM.add(getPrologEpilogInsertionPass());
+/// 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");
+}
- if (!DisablePeephole)
- PM.add(createPeepholeOptsPass(*this));
+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;
+ }
- PM.add(MappingInfoForFunction(Out));
+ // If the user specified a more specific model, use that.
+ TLSModel::Model SelectedModel = getSelectedTLSModel(Var);
+ if (SelectedModel > Model)
+ return SelectedModel;
- // Output assembly language to the .s file. Assembly emission is split into
- // two parts: Function output and Global value output. This is because
- // function output is pipelined with all of the rest of code generation stuff,
- // allowing machine code representations for functions to be free'd after the
- // function has been emitted.
- //
- PM.add(getFunctionAsmPrinterPass(Out));
- PM.add(new FreeMachineCodeForFunction()); // Free stuff no longer needed
+ return Model;
+}
- // Emit Module level assembly after all of the functions have been processed.
- PM.add(getModuleAsmPrinterPass(Out));
+/// getOptLevel - Returns the optimization level: None, Less,
+/// Default, or Aggressive.
+CodeGenOpt::Level TargetMachine::getOptLevel() const {
+ if (!CodeGenInfo)
+ return CodeGenOpt::Default;
+ return CodeGenInfo->getOptLevel();
+}
- // Emit bytecode to the assembly file into its special section next
- PM.add(getEmitBytecodeToAsmPass(Out));
- PM.add(getFunctionInfo(Out));
+void TargetMachine::setOptLevel(CodeGenOpt::Level Level) const {
+ if (CodeGenInfo)
+ CodeGenInfo->setOptLevel(Level);
}
+bool TargetMachine::getAsmVerbosityDefault() {
+ return AsmVerbosityDefault;
+}
-//---------------------------------------------------------------------------
-// class MachineInstructionInfo
-// Interface to description of machine instructions
-//---------------------------------------------------------------------------
+void TargetMachine::setAsmVerbosityDefault(bool V) {
+ AsmVerbosityDefault = V;
+}
+bool TargetMachine::getFunctionSections() {
+ return FunctionSections;
+}
-/*ctor*/
-MachineInstrInfo::MachineInstrInfo(const TargetMachine& tgt,
- const MachineInstrDescriptor* _desc,
- unsigned int _descSize,
- unsigned int _numRealOpCodes)
- : target(tgt),
- desc(_desc), descSize(_descSize), numRealOpCodes(_numRealOpCodes)
-{
- // FIXME: TargetInstrDescriptors should not be global
- assert(TargetInstrDescriptors == NULL && desc != NULL);
- TargetInstrDescriptors = desc; // initialize global variable
-}
-
-
-MachineInstrInfo::~MachineInstrInfo()
-{
- TargetInstrDescriptors = NULL; // reset global variable
-}
-
-
-bool
-MachineInstrInfo::constantFitsInImmedField(MachineOpCode opCode,
- int64_t intValue) const
-{
- // First, check if opCode has an immed field.
- bool isSignExtended;
- uint64_t maxImmedValue = maxImmedConstant(opCode, isSignExtended);
- if (maxImmedValue != 0)
- {
- // NEED TO HANDLE UNSIGNED VALUES SINCE THEY MAY BECOME MUCH
- // SMALLER AFTER CASTING TO SIGN-EXTENDED int, short, or char.
- // See CreateUIntSetInstruction in SparcInstrInfo.cpp.
-
- // Now check if the constant fits
- if (intValue <= (int64_t) maxImmedValue &&
- intValue >= -((int64_t) maxImmedValue+1))
- return true;
- }
-
- return false;
+bool TargetMachine::getDataSections() {
+ return DataSections;
}
+void TargetMachine::setFunctionSections(bool V) {
+ FunctionSections = V;
+}
-//---------------------------------------------------------------------------
-// class MachineCacheInfo
-//
-// Purpose:
-// Describes properties of the target cache architecture.
-//---------------------------------------------------------------------------
+void TargetMachine::setDataSections(bool V) {
+ DataSections = V;
+}
-/*ctor*/
-MachineCacheInfo::MachineCacheInfo(const TargetMachine& tgt)
- : target(tgt)
-{
- Initialize();
+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 =
+ getTargetLowering()->getObjFileLowering();
+ const MCSection *TheSection = TLOF.SectionForGlobal(GV, GVKind, Mang, *this);
+ bool CannotUsePrivateLabel = TLOF.isSectionAtomizableBySymbols(*TheSection);
+ Mang.getNameWithPrefix(Name, GV, CannotUsePrivateLabel);
}
-void
-MachineCacheInfo::Initialize()
-{
- numLevels = 2;
- cacheLineSizes.push_back(16); cacheLineSizes.push_back(32);
- cacheSizes.push_back(1 << 15); cacheSizes.push_back(1 << 20);
- cacheAssoc.push_back(1); cacheAssoc.push_back(4);
+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());
}
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