contrib/llvm/tools/clang/lib/Driver/XRayArgs.cpp

   1 //===--- XRayArgs.cpp - Arguments for XRay --------------------------------===//
   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 #include "clang/Driver/XRayArgs.h"
  10 #include "ToolChains/CommonArgs.h"
  11 #include "clang/Driver/Driver.h"
  12 #include "clang/Driver/DriverDiagnostic.h"
  13 #include "clang/Driver/Options.h"
  14 #include "clang/Driver/ToolChain.h"
  15 #include "llvm/ADT/StringExtras.h"
  16 #include "llvm/ADT/StringSwitch.h"
  17 #include "llvm/Support/FileSystem.h"
  18 #include "llvm/Support/Path.h"
  19 #include "llvm/Support/ScopedPrinter.h"
  20 #include "llvm/Support/SpecialCaseList.h"
  21
  22 using namespace clang;
  23 using namespace clang::driver;
  24 using namespace llvm::opt;
  25
  26 namespace {
  27 constexpr char XRayInstrumentOption[] = "-fxray-instrument";
  28 constexpr char XRayInstructionThresholdOption[] =
  29     "-fxray-instruction-threshold=";
  30 constexpr char XRayAlwaysInstrumentOption[] = "-fxray-always-instrument=";
  31 constexpr char XRayNeverInstrumentOption[] = "-fxray-never-instrument=";
  32 } // namespace
  33
  34 XRayArgs::XRayArgs(const ToolChain &TC, const ArgList &Args) {
  35   const Driver &D = TC.getDriver();
  36   const llvm::Triple &Triple = TC.getTriple();
  37   if (Args.hasFlag(options::OPT_fxray_instrument,
  38                    options::OPT_fnoxray_instrument, false)) {
  39     if (Triple.getOS() == llvm::Triple::Linux)
  40       switch (Triple.getArch()) {
  41       case llvm::Triple::x86_64:
  42       case llvm::Triple::arm:
  43       case llvm::Triple::aarch64:
  44       case llvm::Triple::ppc64le:
  45       case llvm::Triple::mips:
  46       case llvm::Triple::mipsel:
  47       case llvm::Triple::mips64:
  48       case llvm::Triple::mips64el:
  49         break;
  50       default:
  51         D.Diag(diag::err_drv_clang_unsupported)
  52             << (std::string(XRayInstrumentOption) + " on " + Triple.str());
  53       }
  54     else
  55       D.Diag(diag::err_drv_clang_unsupported)
  56           << (std::string(XRayInstrumentOption) + " on non-Linux target OS");
  57     XRayInstrument = true;
  58     if (const Arg *A =
  59             Args.getLastArg(options::OPT_fxray_instruction_threshold_,
  60                             options::OPT_fxray_instruction_threshold_EQ)) {
  61       StringRef S = A->getValue();
  62       if (S.getAsInteger(0, InstructionThreshold) || InstructionThreshold < 0)
  63         D.Diag(clang::diag::err_drv_invalid_value) << A->getAsString(Args) << S;
  64     }
  65
  66     // Validate the always/never attribute files. We also make sure that they
  67     // are treated as actual dependencies.
  68     for (const auto &Filename :
  69          Args.getAllArgValues(options::OPT_fxray_always_instrument)) {
  70       if (llvm::sys::fs::exists(Filename)) {
  71         AlwaysInstrumentFiles.push_back(Filename);
  72         ExtraDeps.push_back(Filename);
  73       } else
  74         D.Diag(clang::diag::err_drv_no_such_file) << Filename;
  75     }
  76
  77     for (const auto &Filename :
  78          Args.getAllArgValues(options::OPT_fxray_never_instrument)) {
  79       if (llvm::sys::fs::exists(Filename)) {
  80         NeverInstrumentFiles.push_back(Filename);
  81         ExtraDeps.push_back(Filename);
  82       } else
  83         D.Diag(clang::diag::err_drv_no_such_file) << Filename;
  84     }
  85   }
  86 }
  87
  88 void XRayArgs::addArgs(const ToolChain &TC, const ArgList &Args,
  89                        ArgStringList &CmdArgs, types::ID InputType) const {
  90   if (!XRayInstrument)
  91     return;
  92
  93   CmdArgs.push_back(XRayInstrumentOption);
  94   CmdArgs.push_back(Args.MakeArgString(Twine(XRayInstructionThresholdOption) +
  95                                        Twine(InstructionThreshold)));
  96
  97   for (const auto &Always : AlwaysInstrumentFiles) {
  98     SmallString<64> AlwaysInstrumentOpt(XRayAlwaysInstrumentOption);
  99     AlwaysInstrumentOpt += Always;
 100     CmdArgs.push_back(Args.MakeArgString(AlwaysInstrumentOpt));
 101   }
 102
 103   for (const auto &Never : NeverInstrumentFiles) {
 104     SmallString<64> NeverInstrumentOpt(XRayNeverInstrumentOption);
 105     NeverInstrumentOpt += Never;
 106     CmdArgs.push_back(Args.MakeArgString(NeverInstrumentOpt));
 107   }
 108
 109   for (const auto &Dep : ExtraDeps) {
 110     SmallString<64> ExtraDepOpt("-fdepfile-entry=");
 111     ExtraDepOpt += Dep;
 112     CmdArgs.push_back(Args.MakeArgString(ExtraDepOpt));
 113   }
 114 }