options_compile.cpp

/*****************************************************************************\

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  \file options_compile.cpp

\*****************************************************************************/

#include "common_clang.h"
#include "options.h"

#include "clang/Driver/Options.h"
#include "llvm/Option/Arg.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Mutex.h"

#include <sstream>

#define PREFIX(NAME, VALUE) const char *const NAME[] = VALUE;
#define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,  \
               HELPTEXT, METAVAR, VALUES)
#include "opencl_clang_options.inc"
#undef OPTION
#undef PREFIX

using namespace llvm::opt;

static llvm::ManagedStatic<llvm::sys::SmartMutex<true> > compileOptionsMutex;

static const OptTable::Info ClangOptionsInfoTable[] = {
#define PREFIX(NAME, VALUE)
#define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,  \
               HELPTEXT, METAVAR, VALUES)                                      \
  {                                                                            \
    PREFIX, NAME, HELPTEXT, METAVAR, OPT_COMPILE_##ID,                         \
        llvm::opt::Option::KIND##Class, PARAM, FLAGS, OPT_COMPILE_##GROUP,     \
        OPT_COMPILE_##ALIAS, ALIASARGS                                         \
  }                                                                            \
  ,
#include "opencl_clang_options.inc"
};

OpenCLCompileOptTable::OpenCLCompileOptTable()
    : OpenCLOptTable(ClangOptionsInfoTable) {}

int EffectiveOptionsFilter::s_progID = 1;

///
// Options filter that validates the opencl used options
//
std::string EffectiveOptionsFilter::processOptions(const OpenCLArgList &args,
                                                   const char *pszOptionsEx,
                                                   ArgsVector &effectiveArgs) {
  // Reset args
  int iCLStdSet = 0;
  std::string szTriple;
  std::string sourceName(llvm::Twine(s_progID++).str());

  for (OpenCLArgList::const_iterator it = args.begin(), ie = args.end();
       it != ie; ++it) {
    switch ((*it)->getOption().getID()) {
    case OPT_COMPILE_w:
    case OPT_COMPILE_D:
    case OPT_COMPILE_I:
    case OPT_COMPILE_Werror:
    case OPT_COMPILE_cl_single_precision_constant:
    case OPT_COMPILE_cl_fp32_correctly_rounded_divide_sqrt:
    case OPT_COMPILE_cl_opt_disable:
    case OPT_COMPILE_cl_mad_enable:
    case OPT_COMPILE_cl_no_signed_zeros:
    case OPT_COMPILE_cl_unsafe_math_optimizations:
      effectiveArgs.push_back((*it)->getAsString(args));
      break;
    case OPT_COMPILE_cl_denorms_are_zero:
      effectiveArgs.push_back("-fdenormal-fp-math=preserve-sign");
      break;
    case OPT_COMPILE_s: {
      std::string newSourceName = (*it)->getValue();
      if (!newSourceName.empty()) {
        sourceName = newSourceName;
        // Normalize path to contain forward slashes
        replace(sourceName.begin(), sourceName.end(), '\\', '/');

#ifdef _WIN32
        // On Windows only, normalize the file name to lower case, since
        // LLVM saves buffer names in a case-sensitive manner, while
        // other Windows tools don't.
        //
        std::transform(sourceName.begin(), sourceName.end(), sourceName.begin(),
                       ::tolower);
#endif
      }
      effectiveArgs.push_back("-main-file-name");
      effectiveArgs.push_back(sourceName.substr(sourceName.rfind('/') + 1));
      break;
    }
    case OPT_COMPILE_cl_finite_math_only:
      effectiveArgs.push_back((*it)->getAsString(args));
      effectiveArgs.push_back("-D");
      effectiveArgs.push_back("__FINITE_MATH_ONLY__=1");
      break;
    case OPT_COMPILE_cl_fast_relaxed_math:
      effectiveArgs.push_back((*it)->getAsString(args));
      effectiveArgs.push_back("-D");
      effectiveArgs.push_back("__FAST_RELAXED_MATH__=1");
      break;
    case OPT_COMPILE_cl_std_CL1_1:
      iCLStdSet = 110;
      effectiveArgs.push_back((*it)->getAsString(args));
      break;
    case OPT_COMPILE_cl_std_CL1_2:
      iCLStdSet = 120;
      effectiveArgs.push_back((*it)->getAsString(args));
      break;
    case OPT_COMPILE_cl_std_CL2_0:
      iCLStdSet = 200;
      effectiveArgs.push_back((*it)->getAsString(args));
      break;
    case OPT_COMPILE_triple:
      szTriple = (*it)->getValue();
      break;
    case OPT_COMPILE_cl_uniform_work_group_size:
    case OPT_COMPILE_cl_no_subgroup_ifp:
    case OPT_COMPILE_target_triple:
    case OPT_COMPILE_spir_std_1_0:
    case OPT_COMPILE_spir_std_1_2:       // ignore for now
    case OPT_COMPILE_cl_kernel_arg_info: // For SPIR, we always create kernel
                                         // arg info, so ignoring it here
      break;
    case OPT_COMPILE_x:
      // ensure that the value is spir
      assert((*it)->getValue() == std::string("spir"));
      // TODO: move the validation of the value to the check section of the
      // option processing to be reported as an unknown option
      break;
      // Just ignore the unknown options ( they will be listed in the unknown
      // list inside the ArgsList anyway)
      // The below assert is usable for manual debugging only
      // default:
      // assert(false && "some unknown argument");
    case OPT_COMPILE_profiling:
    case OPT_COMPILE_g_Flag:
      effectiveArgs.push_back("-debug-info-kind=limited");
      effectiveArgs.push_back("-dwarf-version=4");
      break;
    case OPT_COMPILE_gline_tables_only_Flag:
      effectiveArgs.push_back("-debug-info-kind=line-tables-only");
      effectiveArgs.push_back("-dwarf-version=4");
      break;
    }
  }

  if (!iCLStdSet) {
    effectiveArgs.push_back("-cl-std=CL1.2");
    iCLStdSet = 120;
  }

  effectiveArgs.push_back("-D");
  effectiveArgs.push_back("__OPENCL_VERSION__=" + m_opencl_ver);
  effectiveArgs.push_back("-x");
  effectiveArgs.push_back("cl");

  effectiveArgs.push_back("-cl-kernel-arg-info");
  effectiveArgs.push_back("-fno-validate-pch");
  effectiveArgs.push_back("-fno-caret-diagnostics");
  effectiveArgs.push_back("-dwarf-column-info");

  if (std::find_if(effectiveArgs.begin(), effectiveArgs.end(),
                   [](const ArgsVector::value_type& a) {
                     return a == "-S" || a.find("-emit") == 0;
                   }) == effectiveArgs.end()) {
    effectiveArgs.push_back("-emit-llvm-bc");
  }

  effectiveArgs.push_back("-triple");
  if (szTriple.empty()) {
#if defined(_M_X64) || defined(__LP64__)
    szTriple = "spir64-unknown-unknown";
#else
    szTriple = "spir-unknown-unknown";
#endif
  }

  effectiveArgs.push_back(szTriple);

  effectiveArgs.push_back("-include");
  effectiveArgs.push_back("opencl-c.h");

  // Don't optimize in the frontend
  // clang defaults to -O0, and in that mode, does not produce IR that is
  // intended to be optimized (e.g. produces 'optnone' attribute), so we are
  // using '-disable-llvm-passes' to get out the unoptimized IR.
  effectiveArgs.push_back("-disable-llvm-passes");

  // Specifying the option makes clang emit function body for functions
  // marked with inline keyword.
  effectiveArgs.push_back("-fgnu89-inline");

  // Do not support all extensions by default. Support for a particular
  // extension should be enabled by passing a '-cl-ext' option in pszOptionsEx.
  effectiveArgs.push_back("-cl-ext=-all");

  // OpenCL v2.0 s6.9.u - Implicit function declaration is not supported.
  // Behavior of clang is changed and now there is only warning about
  // implicit function declarations. To be more user friendly and avoid
  // unexpected indirect function calls in IR, let's force this warning to
  // error.
  effectiveArgs.push_back("-Werror=implicit-function-declaration");

  // add the extended options verbatim
  std::back_insert_iterator<ArgsVector> it(std::back_inserter(effectiveArgs));
  quoted_tokenize(it, pszOptionsEx, " \t", '"', '\x00');

  // add source name to options as an input file
  assert(!sourceName.empty() && "Empty source name.");
  effectiveArgs.push_back(sourceName);

  return sourceName;
}

void CompileOptionsParser::processOptions(const char *pszOptions,
                                          const char *pszOptionsEx) {
  // parse options
  unsigned missingArgIndex, missingArgCount;
  std::unique_ptr<OpenCLArgList> pArgs(
      m_optTbl.ParseArgs(pszOptions, missingArgIndex, missingArgCount));

  // post process logic
  m_sourceName =
      m_commonFilter.processOptions(*pArgs, pszOptionsEx, m_effectiveArgs);

  // build the raw options array
  for (ArgsVector::iterator it = m_effectiveArgs.begin(),
                            end = m_effectiveArgs.end();
       it != end; ++it) {
    if (it->compare("-emit-spirv") == 0) {
      m_effectiveArgsRaw.push_back("-emit-llvm-bc");
      m_emitSPIRV = true;
      continue;
    }
    m_effectiveArgsRaw.push_back(it->c_str());
  }
}

bool CompileOptionsParser::checkOptions(const char *pszOptions,
                                        char *pszUnknownOptions,
                                        size_t uiUnknownOptionsSize) {
  // Parse the arguments.
  unsigned missingArgIndex, missingArgCount;
  std::unique_ptr<OpenCLArgList> pArgs(
      m_optTbl.ParseArgs(pszOptions, missingArgIndex, missingArgCount));

  // Check for missing argument error.
  if (missingArgCount) {
    std::fill_n(pszUnknownOptions, uiUnknownOptionsSize, '\0');
    std::string missingArg(pArgs->getArgString(missingArgIndex));
    missingArg.copy(pszUnknownOptions, uiUnknownOptionsSize - 1);
    return false;
  }

  std::string unknownOptions = pArgs->getFilteredArgs(OPT_COMPILE_UNKNOWN);
  if (!unknownOptions.empty()) {
    std::fill_n(pszUnknownOptions, uiUnknownOptionsSize, '\0');
    unknownOptions.copy(pszUnknownOptions, uiUnknownOptionsSize - 1);
    return false;
  }

  // we do not support input options
  std::string inputOptions = pArgs->getFilteredArgs(OPT_COMPILE_INPUT);
  if (!inputOptions.empty()) {
    std::fill_n(pszUnknownOptions, uiUnknownOptionsSize, '\0');
    inputOptions.copy(pszUnknownOptions, uiUnknownOptionsSize - 1);
    return false;
  }

  return true;
}

std::string CompileOptionsParser::getEffectiveOptionsAsString() const {
  std::stringstream ss;

  const char *const *it = beginArgs();
  const char *const *ie = endArgs();

  for (; it != ie; ++it) {
    ss << *it << " ";
  }
  return ss.str();
}

extern "C" CC_DLL_EXPORT bool CheckCompileOptions(const char *pszOptions,
                                                  char *pszUnknownOptions,
                                                  size_t uiUnknownOptionsSize) {
  // LLVM doesn't guarantee thread safety,
  // therefore we serialize execution of LLVM code.
  llvm::sys::SmartScopedLock<true> compileOptionsGuard {*compileOptionsMutex};

  try {
    CompileOptionsParser optionsParser("200");
    return optionsParser.checkOptions(pszOptions, pszUnknownOptions,
                                      uiUnknownOptionsSize);
  } catch (std::bad_alloc &) {
    if (pszUnknownOptions && uiUnknownOptionsSize > 0) {
      std::fill_n(pszUnknownOptions, uiUnknownOptionsSize, '\0');
    }
    return false;
  }
}