LCOV - code coverage report
Current view: top level - include/llvm/CodeGen - CommandFlags.def (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 183 193 94.8 %
Date: 2018-02-26 02:35:35 Functions: 5 5 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===-- CommandFlags.h - Command Line Flags Interface -----------*- C++ -*-===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : // This file contains codegen-specific flags that are shared between different
      11             : // command line tools. The tools "llc" and "opt" both use this file to prevent
      12             : // flag duplication.
      13             : //
      14             : //===----------------------------------------------------------------------===//
      15             : 
      16             : #include "llvm/ADT/StringExtras.h"
      17             : #include "llvm/IR/Instructions.h"
      18             : #include "llvm/IR/Intrinsics.h"
      19             : #include "llvm/IR/Module.h"
      20             : #include "llvm/MC/MCTargetOptionsCommandFlags.def"
      21             : #include "llvm/MC/SubtargetFeature.h"
      22             : #include "llvm/Support/CodeGen.h"
      23             : #include "llvm/Support/CommandLine.h"
      24             : #include "llvm/Support/Host.h"
      25             : #include "llvm/Target/TargetMachine.h"
      26             : #include "llvm/Target/TargetOptions.h"
      27             : #include <string>
      28             : using namespace llvm;
      29             : 
      30             : static cl::opt<std::string>
      31       31427 :     MArch("march",
      32       31427 :           cl::desc("Architecture to generate code for (see --version)"));
      33             : 
      34             : static cl::opt<std::string>
      35       31427 :     MCPU("mcpu",
      36       31427 :          cl::desc("Target a specific cpu type (-mcpu=help for details)"),
      37       94281 :          cl::value_desc("cpu-name"), cl::init(""));
      38             : 
      39             : static cl::list<std::string>
      40       31427 :     MAttrs("mattr", cl::CommaSeparated,
      41       31427 :            cl::desc("Target specific attributes (-mattr=help for details)"),
      42       62854 :            cl::value_desc("a1,+a2,-a3,..."));
      43             : 
      44       31427 : static cl::opt<Reloc::Model> RelocModel(
      45       31427 :     "relocation-model", cl::desc("Choose relocation model"),
      46      251416 :     cl::values(
      47             :         clEnumValN(Reloc::Static, "static", "Non-relocatable code"),
      48             :         clEnumValN(Reloc::PIC_, "pic",
      49             :                    "Fully relocatable, position independent code"),
      50             :         clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic",
      51             :                    "Relocatable external references, non-relocatable code"),
      52             :         clEnumValN(Reloc::ROPI, "ropi",
      53             :                    "Code and read-only data relocatable, accessed PC-relative"),
      54             :         clEnumValN(
      55             :             Reloc::RWPI, "rwpi",
      56             :             "Read-write data relocatable, accessed relative to static base"),
      57             :         clEnumValN(Reloc::ROPI_RWPI, "ropi-rwpi",
      58       31427 :                    "Combination of ropi and rwpi")));
      59             : 
      60             : LLVM_ATTRIBUTE_UNUSED static Optional<Reloc::Model> getRelocModel() {
      61       21798 :   if (RelocModel.getNumOccurrences()) {
      62             :     Reloc::Model R = RelocModel;
      63             :     return R;
      64             :   }
      65             :   return None;
      66             : }
      67             : 
      68       31427 : static cl::opt<ThreadModel::Model> TMModel(
      69       31427 :     "thread-model", cl::desc("Choose threading model"),
      70       62854 :     cl::init(ThreadModel::POSIX),
      71       31427 :     cl::values(clEnumValN(ThreadModel::POSIX, "posix", "POSIX thread model"),
      72             :                clEnumValN(ThreadModel::Single, "single",
      73       31427 :                           "Single thread model")));
      74             : 
      75       31427 : static cl::opt<llvm::CodeModel::Model> CMModel(
      76       31427 :     "code-model", cl::desc("Choose code model"),
      77      188562 :     cl::values(clEnumValN(CodeModel::Small, "small", "Small code model"),
      78             :                clEnumValN(CodeModel::Kernel, "kernel", "Kernel code model"),
      79             :                clEnumValN(CodeModel::Medium, "medium", "Medium code model"),
      80       31427 :                clEnumValN(CodeModel::Large, "large", "Large code model")));
      81             : 
      82             : LLVM_ATTRIBUTE_UNUSED static Optional<CodeModel::Model> getCodeModel() {
      83       21783 :   if (CMModel.getNumOccurrences()) {
      84             :     CodeModel::Model M = CMModel;
      85             :     return M;
      86             :   }
      87             :   return None;
      88             : }
      89             : 
      90       31427 : static cl::opt<llvm::ExceptionHandling> ExceptionModel(
      91       31427 :     "exception-model", cl::desc("exception model"),
      92       62854 :     cl::init(ExceptionHandling::None),
      93      251416 :     cl::values(
      94             :         clEnumValN(ExceptionHandling::None, "default",
      95             :                    "default exception handling model"),
      96             :         clEnumValN(ExceptionHandling::DwarfCFI, "dwarf",
      97             :                    "DWARF-like CFI based exception handling"),
      98             :         clEnumValN(ExceptionHandling::SjLj, "sjlj", "SjLj exception handling"),
      99             :         clEnumValN(ExceptionHandling::ARM, "arm", "ARM EHABI exceptions"),
     100             :         clEnumValN(ExceptionHandling::WinEH, "wineh",
     101             :                    "Windows exception model"),
     102             :         clEnumValN(ExceptionHandling::Wasm, "wasm",
     103       31427 :                    "WebAssembly exception handling")));
     104             : 
     105       31427 : static cl::opt<TargetMachine::CodeGenFileType> FileType(
     106       62854 :     "filetype", cl::init(TargetMachine::CGFT_AssemblyFile),
     107       31427 :     cl::desc(
     108             :         "Choose a file type (not all types are supported by all targets):"),
     109      157135 :     cl::values(clEnumValN(TargetMachine::CGFT_AssemblyFile, "asm",
     110             :                           "Emit an assembly ('.s') file"),
     111             :                clEnumValN(TargetMachine::CGFT_ObjectFile, "obj",
     112             :                           "Emit a native object ('.o') file"),
     113             :                clEnumValN(TargetMachine::CGFT_Null, "null",
     114       31427 :                           "Emit nothing, for performance testing")));
     115             : 
     116             : static cl::opt<bool>
     117       31427 :     DisableFPElim("disable-fp-elim",
     118       31427 :                   cl::desc("Disable frame pointer elimination optimization"),
     119       94281 :                   cl::init(false));
     120             : 
     121       31427 : static cl::opt<bool> EnableUnsafeFPMath(
     122             :     "enable-unsafe-fp-math",
     123       31427 :     cl::desc("Enable optimizations that may decrease FP precision"),
     124       94281 :     cl::init(false));
     125             : 
     126       31427 : static cl::opt<bool> EnableNoInfsFPMath(
     127             :     "enable-no-infs-fp-math",
     128       31427 :     cl::desc("Enable FP math optimizations that assume no +-Infs"),
     129       94281 :     cl::init(false));
     130             : 
     131       31427 : static cl::opt<bool> EnableNoNaNsFPMath(
     132             :     "enable-no-nans-fp-math",
     133       31427 :     cl::desc("Enable FP math optimizations that assume no NaNs"),
     134       94281 :     cl::init(false));
     135             : 
     136       31427 : static cl::opt<bool> EnableNoSignedZerosFPMath(
     137             :     "enable-no-signed-zeros-fp-math",
     138       31427 :     cl::desc("Enable FP math optimizations that assume "
     139             :              "the sign of 0 is insignificant"),
     140       94281 :     cl::init(false));
     141             : 
     142             : static cl::opt<bool>
     143       31427 :     EnableNoTrappingFPMath("enable-no-trapping-fp-math",
     144       31427 :                            cl::desc("Enable setting the FP exceptions build "
     145             :                                     "attribute not to use exceptions"),
     146       94281 :                            cl::init(false));
     147             : 
     148       31427 : static cl::opt<llvm::FPDenormal::DenormalMode> DenormalMode(
     149             :     "denormal-fp-math",
     150       31427 :     cl::desc("Select which denormal numbers the code is permitted to require"),
     151       62854 :     cl::init(FPDenormal::IEEE),
     152      157135 :     cl::values(clEnumValN(FPDenormal::IEEE, "ieee",
     153             :                           "IEEE 754 denormal numbers"),
     154             :                clEnumValN(FPDenormal::PreserveSign, "preserve-sign",
     155             :                           "the sign of a  flushed-to-zero number is preserved "
     156             :                           "in the sign of 0"),
     157             :                clEnumValN(FPDenormal::PositiveZero, "positive-zero",
     158       31427 :                           "denormals are flushed to positive zero")));
     159             : 
     160       31427 : static cl::opt<bool> EnableHonorSignDependentRoundingFPMath(
     161             :     "enable-sign-dependent-rounding-fp-math", cl::Hidden,
     162       31427 :     cl::desc("Force codegen to assume rounding mode can change dynamically"),
     163       94281 :     cl::init(false));
     164             : 
     165       31427 : static cl::opt<llvm::FloatABI::ABIType> FloatABIForCalls(
     166       62854 :     "float-abi", cl::desc("Choose float ABI type"), cl::init(FloatABI::Default),
     167      157135 :     cl::values(clEnumValN(FloatABI::Default, "default",
     168             :                           "Target default float ABI type"),
     169             :                clEnumValN(FloatABI::Soft, "soft",
     170             :                           "Soft float ABI (implied by -soft-float)"),
     171             :                clEnumValN(FloatABI::Hard, "hard",
     172       31427 :                           "Hard float ABI (uses FP registers)")));
     173             : 
     174       31427 : static cl::opt<llvm::FPOpFusion::FPOpFusionMode> FuseFPOps(
     175       31427 :     "fp-contract", cl::desc("Enable aggressive formation of fused FP ops"),
     176       62854 :     cl::init(FPOpFusion::Standard),
     177      157135 :     cl::values(
     178             :         clEnumValN(FPOpFusion::Fast, "fast", "Fuse FP ops whenever profitable"),
     179             :         clEnumValN(FPOpFusion::Standard, "on", "Only fuse 'blessed' FP ops."),
     180             :         clEnumValN(FPOpFusion::Strict, "off",
     181       31427 :                    "Only fuse FP ops when the result won't be affected.")));
     182             : 
     183       31427 : static cl::opt<bool> DontPlaceZerosInBSS(
     184             :     "nozero-initialized-in-bss",
     185       31427 :     cl::desc("Don't place zero-initialized symbols into bss section"),
     186       94281 :     cl::init(false));
     187             : 
     188       31427 : static cl::opt<bool> EnableGuaranteedTailCallOpt(
     189             :     "tailcallopt",
     190       31427 :     cl::desc(
     191             :         "Turn fastcc calls into tail calls by (potentially) changing ABI."),
     192       94281 :     cl::init(false));
     193             : 
     194       31427 : static cl::opt<bool> DisableTailCalls("disable-tail-calls",
     195       31427 :                                       cl::desc("Never emit tail calls"),
     196       94281 :                                       cl::init(false));
     197             : 
     198       31427 : static cl::opt<bool> StackSymbolOrdering("stack-symbol-ordering",
     199       31427 :                                          cl::desc("Order local stack symbols."),
     200       94281 :                                          cl::init(true));
     201             : 
     202             : static cl::opt<unsigned>
     203       31427 :     OverrideStackAlignment("stack-alignment",
     204       31427 :                            cl::desc("Override default stack alignment"),
     205       94281 :                            cl::init(0));
     206             : 
     207             : static cl::opt<bool>
     208       31427 :     StackRealign("stackrealign",
     209       31427 :                  cl::desc("Force align the stack to the minimum alignment"),
     210       94281 :                  cl::init(false));
     211             : 
     212       31427 : static cl::opt<std::string> TrapFuncName(
     213             :     "trap-func", cl::Hidden,
     214       31427 :     cl::desc("Emit a call to trap function rather than a trap instruction"),
     215       94281 :     cl::init(""));
     216             : 
     217       31427 : static cl::opt<bool> UseCtors("use-ctors",
     218       31427 :                               cl::desc("Use .ctors instead of .init_array."),
     219       94281 :                               cl::init(false));
     220             : 
     221       31427 : static cl::opt<bool> RelaxELFRelocations(
     222             :     "relax-elf-relocations",
     223       31427 :     cl::desc("Emit GOTPCRELX/REX_GOTPCRELX instead of GOTPCREL on x86-64 ELF"),
     224       94281 :     cl::init(false));
     225             : 
     226       31427 : static cl::opt<bool> DataSections("data-sections",
     227       31427 :                                   cl::desc("Emit data into separate sections"),
     228       94281 :                                   cl::init(false));
     229             : 
     230             : static cl::opt<bool>
     231       31427 :     FunctionSections("function-sections",
     232       31427 :                      cl::desc("Emit functions into separate sections"),
     233       94281 :                      cl::init(false));
     234             : 
     235       31427 : static cl::opt<bool> EmulatedTLS("emulated-tls",
     236       31427 :                                  cl::desc("Use emulated TLS model"),
     237       94281 :                                  cl::init(false));
     238             : 
     239             : static cl::opt<bool>
     240       31427 :     UniqueSectionNames("unique-section-names",
     241       31427 :                        cl::desc("Give unique names to every section"),
     242       94281 :                        cl::init(true));
     243             : 
     244             : static cl::opt<llvm::EABI>
     245       62854 :     EABIVersion("meabi", cl::desc("Set EABI type (default depends on triple):"),
     246       62854 :                 cl::init(EABI::Default),
     247      188562 :                 cl::values(clEnumValN(EABI::Default, "default",
     248             :                                       "Triple default EABI version"),
     249             :                            clEnumValN(EABI::EABI4, "4", "EABI version 4"),
     250             :                            clEnumValN(EABI::EABI5, "5", "EABI version 5"),
     251       31427 :                            clEnumValN(EABI::GNU, "gnu", "EABI GNU")));
     252             : 
     253       31427 : static cl::opt<DebuggerKind> DebuggerTuningOpt(
     254       31427 :     "debugger-tune", cl::desc("Tune debug info for a particular debugger"),
     255       62854 :     cl::init(DebuggerKind::Default),
     256      157135 :     cl::values(clEnumValN(DebuggerKind::GDB, "gdb", "gdb"),
     257             :                clEnumValN(DebuggerKind::LLDB, "lldb", "lldb"),
     258       31427 :                clEnumValN(DebuggerKind::SCE, "sce", "SCE targets (e.g. PS4)")));
     259             : 
     260       31427 : static cl::opt<bool> EnableStackSizeSection(
     261             :     "stack-size-section",
     262       62854 :     cl::desc("Emit a section containing stack size metadata"), cl::init(false));
     263             : 
     264             : // Common utility function tightly tied to the options listed here. Initializes
     265             : // a TargetOptions object with CodeGen flags and returns it.
     266       28767 : static TargetOptions InitTargetOptionsFromCodeGenFlags() {
     267       28767 :   TargetOptions Options;
     268       28767 :   Options.AllowFPOpFusion = FuseFPOps;
     269       28767 :   Options.UnsafeFPMath = EnableUnsafeFPMath;
     270       28767 :   Options.NoInfsFPMath = EnableNoInfsFPMath;
     271       28767 :   Options.NoNaNsFPMath = EnableNoNaNsFPMath;
     272       28767 :   Options.NoSignedZerosFPMath = EnableNoSignedZerosFPMath;
     273       28767 :   Options.NoTrappingFPMath = EnableNoTrappingFPMath;
     274       28767 :   Options.FPDenormalMode = DenormalMode;
     275       28767 :   Options.HonorSignDependentRoundingFPMathOption =
     276             :       EnableHonorSignDependentRoundingFPMath;
     277       28767 :   if (FloatABIForCalls != FloatABI::Default)
     278         100 :     Options.FloatABIType = FloatABIForCalls;
     279       28767 :   Options.NoZerosInBSS = DontPlaceZerosInBSS;
     280       28767 :   Options.GuaranteedTailCallOpt = EnableGuaranteedTailCallOpt;
     281       28767 :   Options.StackAlignmentOverride = OverrideStackAlignment;
     282       28767 :   Options.StackSymbolOrdering = StackSymbolOrdering;
     283       28767 :   Options.UseInitArray = !UseCtors;
     284       28767 :   Options.RelaxELFRelocations = RelaxELFRelocations;
     285       28767 :   Options.DataSections = DataSections;
     286       28767 :   Options.FunctionSections = FunctionSections;
     287       28767 :   Options.UniqueSectionNames = UniqueSectionNames;
     288       28767 :   Options.EmulatedTLS = EmulatedTLS;
     289       28767 :   Options.ExceptionModel = ExceptionModel;
     290       28767 :   Options.EmitStackSizeSection = EnableStackSizeSection;
     291             : 
     292       28767 :   Options.MCOptions = InitMCTargetOptionsFromFlags();
     293             : 
     294       28767 :   Options.ThreadModel = TMModel;
     295       28767 :   Options.EABIVersion = EABIVersion;
     296       28767 :   Options.DebuggerTuning = DebuggerTuningOpt;
     297             : 
     298       28767 :   return Options;
     299             : }
     300             : 
     301       21846 : LLVM_ATTRIBUTE_UNUSED static std::string getCPUStr() {
     302             :   // If user asked for the 'native' CPU, autodetect here. If autodection fails,
     303             :   // this will set the CPU to an empty string which tells the target to
     304             :   // pick a basic default.
     305       21846 :   if (MCPU == "native")
     306           0 :     return sys::getHostCPUName();
     307             : 
     308             :   return MCPU;
     309             : }
     310             : 
     311       21539 : LLVM_ATTRIBUTE_UNUSED static std::string getFeaturesStr() {
     312       21539 :   SubtargetFeatures Features;
     313             : 
     314             :   // If user asked for the 'native' CPU, we need to autodetect features.
     315             :   // This is necessary for x86 where the CPU might not support all the
     316             :   // features the autodetected CPU name lists in the target. For example,
     317             :   // not all Sandybridge processors support AVX.
     318       21539 :   if (MCPU == "native") {
     319           0 :     StringMap<bool> HostFeatures;
     320           0 :     if (sys::getHostCPUFeatures(HostFeatures))
     321           0 :       for (auto &F : HostFeatures)
     322           0 :         Features.AddFeature(F.first(), F.second);
     323             :   }
     324             : 
     325       63268 :   for (unsigned i = 0; i != MAttrs.size(); ++i)
     326        6730 :     Features.AddFeature(MAttrs[i]);
     327             : 
     328       43078 :   return Features.getString();
     329             : }
     330             : 
     331         180 : LLVM_ATTRIBUTE_UNUSED static std::vector<std::string> getFeatureList() {
     332         180 :   SubtargetFeatures Features;
     333             : 
     334             :   // If user asked for the 'native' CPU, we need to autodetect features.
     335             :   // This is necessary for x86 where the CPU might not support all the
     336             :   // features the autodetected CPU name lists in the target. For example,
     337             :   // not all Sandybridge processors support AVX.
     338         180 :   if (MCPU == "native") {
     339           0 :     StringMap<bool> HostFeatures;
     340           0 :     if (sys::getHostCPUFeatures(HostFeatures))
     341           0 :       for (auto &F : HostFeatures)
     342           0 :         Features.AddFeature(F.first(), F.second);
     343             :   }
     344             : 
     345         360 :   for (unsigned i = 0; i != MAttrs.size(); ++i)
     346           0 :     Features.AddFeature(MAttrs[i]);
     347             : 
     348         360 :   return Features.getFeatures();
     349             : }
     350             : 
     351             : /// \brief Set function attributes of functions in Module M based on CPU,
     352             : /// Features, and command line flags.
     353             : LLVM_ATTRIBUTE_UNUSED static void
     354       27988 : setFunctionAttributes(StringRef CPU, StringRef Features, Module &M) {
     355      285624 :   for (auto &F : M) {
     356      257636 :     auto &Ctx = F.getContext();
     357      257636 :     AttributeList Attrs = F.getAttributes();
     358             :     AttrBuilder NewAttrs;
     359             : 
     360      257636 :     if (!CPU.empty())
     361       82419 :       NewAttrs.addAttribute("target-cpu", CPU);
     362      257636 :     if (!Features.empty())
     363       94136 :       NewAttrs.addAttribute("target-features", Features);
     364      257636 :     if (DisableFPElim.getNumOccurrences() > 0)
     365        1909 :       NewAttrs.addAttribute("no-frame-pointer-elim",
     366        3818 :                             DisableFPElim ? "true" : "false");
     367      257636 :     if (DisableTailCalls.getNumOccurrences() > 0)
     368          34 :       NewAttrs.addAttribute("disable-tail-calls",
     369          34 :                             toStringRef(DisableTailCalls));
     370      257636 :     if (StackRealign)
     371         168 :       NewAttrs.addAttribute("stackrealign");
     372             : 
     373      257636 :     if (TrapFuncName.getNumOccurrences() > 0)
     374          19 :       for (auto &B : F)
     375          21 :         for (auto &I : B)
     376             :           if (auto *Call = dyn_cast<CallInst>(&I))
     377             :             if (const auto *F = Call->getCalledFunction())
     378           7 :               if (F->getIntrinsicID() == Intrinsic::debugtrap ||
     379             :                   F->getIntrinsicID() == Intrinsic::trap)
     380          14 :                 Call->addAttribute(
     381             :                     llvm::AttributeList::FunctionIndex,
     382             :                     Attribute::get(Ctx, "trap-func-name", TrapFuncName));
     383             : 
     384             :     // Let NewAttrs override Attrs.
     385      257636 :     F.setAttributes(
     386             :         Attrs.addAttributes(Ctx, AttributeList::FunctionIndex, NewAttrs));
     387             :   }
     388       27988 : }

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