//
//===----------------------------------------------------------------------===//
+#include "llvm/Target/TargetMachine.h"
#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineFrameInfo.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/Target/TargetMachine.h"
-#include "llvm/Target/TargetOptions.h"
+#include "llvm/MC/MCCodeGenInfo.h"
+#include "llvm/MC/MCContext.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;
-//---------------------------------------------------------------------------
-// Command-line options that tend to be useful on more than one back-end.
-//
-
-namespace llvm {
- bool LessPreciseFPMADOption;
- bool PrintMachineCode;
- bool NoFramePointerElim;
- bool NoFramePointerElimNonLeaf;
- bool NoExcessFPPrecision;
- bool UnsafeFPMath;
- bool NoInfsFPMath;
- bool NoNaNsFPMath;
- bool HonorSignDependentRoundingFPMathOption;
- bool UseSoftFloat;
- FloatABI::ABIType FloatABIType;
- bool NoImplicitFloat;
- bool NoZerosInBSS;
- bool JITExceptionHandling;
- bool JITEmitDebugInfo;
- bool JITEmitDebugInfoToDisk;
- bool GuaranteedTailCallOpt;
- unsigned StackAlignmentOverride;
- bool RealignStack;
- bool DisableJumpTables;
- bool StrongPHIElim;
- bool HasDivModLibcall;
- bool AsmVerbosityDefault(false);
-}
-
-static cl::opt<bool, true>
-PrintCode("print-machineinstrs",
- cl::desc("Print generated machine code"),
- cl::location(PrintMachineCode), cl::init(false));
-static cl::opt<bool, true>
-DisableFPElim("disable-fp-elim",
- cl::desc("Disable frame pointer elimination optimization"),
- cl::location(NoFramePointerElim),
- cl::init(false));
-static cl::opt<bool, true>
-DisableFPElimNonLeaf("disable-non-leaf-fp-elim",
- cl::desc("Disable frame pointer elimination optimization for non-leaf funcs"),
- cl::location(NoFramePointerElimNonLeaf),
- cl::init(false));
-static cl::opt<bool, true>
-DisableExcessPrecision("disable-excess-fp-precision",
- cl::desc("Disable optimizations that may increase FP precision"),
- cl::location(NoExcessFPPrecision),
- cl::init(false));
-static cl::opt<bool, true>
-EnableFPMAD("enable-fp-mad",
- cl::desc("Enable less precise MAD instructions to be generated"),
- cl::location(LessPreciseFPMADOption),
- cl::init(false));
-static cl::opt<bool, true>
-EnableUnsafeFPMath("enable-unsafe-fp-math",
- cl::desc("Enable optimizations that may decrease FP precision"),
- cl::location(UnsafeFPMath),
- cl::init(false));
-static cl::opt<bool, true>
-EnableNoInfsFPMath("enable-no-infs-fp-math",
- cl::desc("Enable FP math optimizations that assume no +-Infs"),
- cl::location(NoInfsFPMath),
- cl::init(false));
-static cl::opt<bool, true>
-EnableNoNaNsFPMath("enable-no-nans-fp-math",
- cl::desc("Enable FP math optimizations that assume no NaNs"),
- cl::location(NoNaNsFPMath),
- cl::init(false));
-static cl::opt<bool, true>
-EnableHonorSignDependentRoundingFPMath("enable-sign-dependent-rounding-fp-math",
- cl::Hidden,
- cl::desc("Force codegen to assume rounding mode can change dynamically"),
- cl::location(HonorSignDependentRoundingFPMathOption),
- cl::init(false));
-static cl::opt<bool, true>
-GenerateSoftFloatCalls("soft-float",
- cl::desc("Generate software floating point library calls"),
- cl::location(UseSoftFloat),
- cl::init(false));
-static cl::opt<llvm::FloatABI::ABIType, true>
-FloatABIForCalls("float-abi",
- cl::desc("Choose float ABI type"),
- cl::location(FloatABIType),
- cl::init(FloatABI::Default),
- cl::values(
- clEnumValN(FloatABI::Default, "default",
- "Target default float ABI type"),
- clEnumValN(FloatABI::Soft, "soft",
- "Soft float ABI (implied by -soft-float)"),
- clEnumValN(FloatABI::Hard, "hard",
- "Hard float ABI (uses FP registers)"),
- clEnumValEnd));
-static cl::opt<bool, true>
-DontPlaceZerosInBSS("nozero-initialized-in-bss",
- cl::desc("Don't place zero-initialized symbols into bss section"),
- cl::location(NoZerosInBSS),
- cl::init(false));
-static cl::opt<bool, true>
-EnableJITExceptionHandling("jit-enable-eh",
- cl::desc("Emit exception handling information"),
- cl::location(JITExceptionHandling),
- cl::init(false));
-// In debug builds, make this default to true.
-#ifdef NDEBUG
-#define EMIT_DEBUG false
-#else
-#define EMIT_DEBUG true
-#endif
-static cl::opt<bool, true>
-EmitJitDebugInfo("jit-emit-debug",
- cl::desc("Emit debug information to debugger"),
- cl::location(JITEmitDebugInfo),
- cl::init(EMIT_DEBUG));
-#undef EMIT_DEBUG
-static cl::opt<bool, true>
-EmitJitDebugInfoToDisk("jit-emit-debug-to-disk",
- cl::Hidden,
- cl::desc("Emit debug info objfiles to disk"),
- cl::location(JITEmitDebugInfoToDisk),
- cl::init(false));
-
-static cl::opt<bool, true>
-EnableGuaranteedTailCallOpt("tailcallopt",
- cl::desc("Turn fastcc calls into tail calls by (potentially) changing ABI."),
- cl::location(GuaranteedTailCallOpt),
- cl::init(false));
-static cl::opt<unsigned, true>
-OverrideStackAlignment("stack-alignment",
- cl::desc("Override default stack alignment"),
- cl::location(StackAlignmentOverride),
- cl::init(0));
-static cl::opt<bool, true>
-EnableRealignStack("realign-stack",
- cl::desc("Realign stack if needed"),
- cl::location(RealignStack),
- cl::init(true));
-static cl::opt<bool, true>
-DisableSwitchTables(cl::Hidden, "disable-jump-tables",
- cl::desc("Do not generate jump tables."),
- cl::location(DisableJumpTables),
- cl::init(false));
-static cl::opt<bool, true>
-EnableStrongPHIElim(cl::Hidden, "strong-phi-elim",
- cl::desc("Use strong PHI elimination."),
- cl::location(StrongPHIElim),
- cl::init(false));
-static cl::opt<std::string>
-TrapFuncName("trap-func", cl::Hidden,
- cl::desc("Emit a call to trap function rather than a trap instruction"),
- cl::init(""));
-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)
+ 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) {
- // Typically it will be subtargets that will adjust FloatABIType from Default
- // to Soft or Hard.
- if (UseSoftFloat)
- FloatABIType = FloatABI::Soft;
+ CodeGenInfo(nullptr), AsmInfo(nullptr),
+ RequireStructuredCFG(false),
+ Options(Options) {
}
TargetMachine::~TargetMachine() {
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 {
return CodeGenInfo->getCodeModel();
}
-bool TargetMachine::getAsmVerbosityDefault() {
- return AsmVerbosityDefault;
+/// 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");
}
-void TargetMachine::setAsmVerbosityDefault(bool V) {
- AsmVerbosityDefault = V;
+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;
}
-bool TargetMachine::getFunctionSections() {
- return FunctionSections;
+/// 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::getDataSections() {
- return DataSections;
+void TargetMachine::setOptLevel(CodeGenOpt::Level Level) const {
+ if (CodeGenInfo)
+ CodeGenInfo->setOptLevel(Level);
}
-void TargetMachine::setFunctionSections(bool V) {
- FunctionSections = V;
+bool TargetMachine::getAsmVerbosityDefault() const {
+ return Options.MCOptions.AsmVerbose;
}
-void TargetMachine::setDataSections(bool V) {
- DataSections = V;
+void TargetMachine::setAsmVerbosityDefault(bool V) {
+ Options.MCOptions.AsmVerbose = V;
}
-namespace llvm {
- /// DisableFramePointerElim - This returns true if frame pointer elimination
- /// optimization should be disabled for the given machine function.
- bool DisableFramePointerElim(const MachineFunction &MF) {
- // Check to see if we should eliminate non-leaf frame pointers and then
- // check to see if we should eliminate all frame pointers.
- if (NoFramePointerElimNonLeaf && !NoFramePointerElim) {
- const MachineFrameInfo *MFI = MF.getFrameInfo();
- return MFI->hasCalls();
- }
+bool TargetMachine::getFunctionSections() const {
+ return Options.FunctionSections;
+}
- return NoFramePointerElim;
- }
+bool TargetMachine::getDataSections() const {
+ return Options.DataSections;
+}
- /// LessPreciseFPMAD - This flag return true when -enable-fp-mad option
- /// is specified on the command line. When this flag is off(default), the
- /// code generator is not allowed to generate mad (multiply add) if the
- /// result is "less precise" than doing those operations individually.
- bool LessPreciseFPMAD() { return UnsafeFPMath || LessPreciseFPMADOption; }
+void TargetMachine::setFunctionSections(bool V) {
+ Options.FunctionSections = V;
+}
- /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
- /// that the rounding mode of the FPU can change from its default.
- bool HonorSignDependentRoundingFPMath() {
- return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
- }
+void TargetMachine::setDataSections(bool V) {
+ Options.DataSections = V;
+}
- /// getTrapFunctionName - If this returns a non-empty string, this means isel
- /// should lower Intrinsic::trap to a call to the specified function name
- /// instead of an ISD::TRAP node.
- StringRef getTrapFunctionName() {
- return TrapFuncName;
+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 = TLOF.isSectionAtomizableBySymbols(*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());
}