contrib/llvm/tools/clang/lib/Basic/Builtins.cpp

   1 //===--- Builtins.cpp - Builtin function implementation -------------------===//
   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 implements various things for builtin functions.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "clang/Basic/Builtins.h"
  15 #include "clang/Basic/IdentifierTable.h"
  16 #include "clang/Basic/LangOptions.h"
  17 #include "clang/Basic/TargetInfo.h"
  18 #include "llvm/ADT/StringRef.h"
  19 using namespace clang;
  20
  21 static const Builtin::Info BuiltinInfo[] = {
  22   { "not a builtin function", nullptr, nullptr, nullptr, ALL_LANGUAGES,nullptr},
  23 #define BUILTIN(ID, TYPE, ATTRS)                                               \
  24   { #ID, TYPE, ATTRS, nullptr, ALL_LANGUAGES, nullptr },
  25 #define LANGBUILTIN(ID, TYPE, ATTRS, LANGS)                                    \
  26   { #ID, TYPE, ATTRS, nullptr, LANGS, nullptr },
  27 #define LIBBUILTIN(ID, TYPE, ATTRS, HEADER, LANGS)                             \
  28   { #ID, TYPE, ATTRS, HEADER, LANGS, nullptr },
  29 #include "clang/Basic/Builtins.def"
  30 };
  31
  32 const Builtin::Info &Builtin::Context::getRecord(unsigned ID) const {
  33   if (ID < Builtin::FirstTSBuiltin)
  34     return BuiltinInfo[ID];
  35   assert(((ID - Builtin::FirstTSBuiltin) <
  36           (TSRecords.size() + AuxTSRecords.size())) &&
  37          "Invalid builtin ID!");
  38   if (isAuxBuiltinID(ID))
  39     return AuxTSRecords[getAuxBuiltinID(ID) - Builtin::FirstTSBuiltin];
  40   return TSRecords[ID - Builtin::FirstTSBuiltin];
  41 }
  42
  43 void Builtin::Context::InitializeTarget(const TargetInfo &Target,
  44                                         const TargetInfo *AuxTarget) {
  45   assert(TSRecords.empty() && "Already initialized target?");
  46   TSRecords = Target.getTargetBuiltins();
  47   if (AuxTarget)
  48     AuxTSRecords = AuxTarget->getTargetBuiltins();
  49 }
  50
  51 bool Builtin::Context::isBuiltinFunc(const char *Name) {
  52   StringRef FuncName(Name);
  53   for (unsigned i = Builtin::NotBuiltin + 1; i != Builtin::FirstTSBuiltin; ++i)
  54     if (FuncName.equals(BuiltinInfo[i].Name))
  55       return strchr(BuiltinInfo[i].Attributes, 'f') != nullptr;
  56
  57   return false;
  58 }
  59
  60 bool Builtin::Context::builtinIsSupported(const Builtin::Info &BuiltinInfo,
  61                                           const LangOptions &LangOpts) {
  62   bool BuiltinsUnsupported =
  63       (LangOpts.NoBuiltin || LangOpts.isNoBuiltinFunc(BuiltinInfo.Name)) &&
  64       strchr(BuiltinInfo.Attributes, 'f');
  65   bool MathBuiltinsUnsupported =
  66     LangOpts.NoMathBuiltin && BuiltinInfo.HeaderName &&
  67     llvm::StringRef(BuiltinInfo.HeaderName).equals("math.h");
  68   bool GnuModeUnsupported = !LangOpts.GNUMode && (BuiltinInfo.Langs & GNU_LANG);
  69   bool MSModeUnsupported =
  70       !LangOpts.MicrosoftExt && (BuiltinInfo.Langs & MS_LANG);
  71   bool ObjCUnsupported = !LangOpts.ObjC1 && BuiltinInfo.Langs == OBJC_LANG;
  72   return !BuiltinsUnsupported && !MathBuiltinsUnsupported &&
  73          !GnuModeUnsupported && !MSModeUnsupported && !ObjCUnsupported;
  74 }
  75
  76 /// initializeBuiltins - Mark the identifiers for all the builtins with their
  77 /// appropriate builtin ID # and mark any non-portable builtin identifiers as
  78 /// such.
  79 void Builtin::Context::initializeBuiltins(IdentifierTable &Table,
  80                                           const LangOptions& LangOpts) {
  81   // Step #1: mark all target-independent builtins with their ID's.
  82   for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
  83     if (builtinIsSupported(BuiltinInfo[i], LangOpts)) {
  84       Table.get(BuiltinInfo[i].Name).setBuiltinID(i);
  85     }
  86
  87   // Step #2: Register target-specific builtins.
  88   for (unsigned i = 0, e = TSRecords.size(); i != e; ++i)
  89     if (builtinIsSupported(TSRecords[i], LangOpts))
  90       Table.get(TSRecords[i].Name).setBuiltinID(i + Builtin::FirstTSBuiltin);
  91
  92   // Step #3: Register target-specific builtins for AuxTarget.
  93   for (unsigned i = 0, e = AuxTSRecords.size(); i != e; ++i)
  94     Table.get(AuxTSRecords[i].Name)
  95         .setBuiltinID(i + Builtin::FirstTSBuiltin + TSRecords.size());
  96 }
  97
  98 void Builtin::Context::forgetBuiltin(unsigned ID, IdentifierTable &Table) {
  99   Table.get(getRecord(ID).Name).setBuiltinID(0);
 100 }
 101
 102 bool Builtin::Context::isLike(unsigned ID, unsigned &FormatIdx,
 103                               bool &HasVAListArg, const char *Fmt) const {
 104   assert(Fmt && "Not passed a format string");
 105   assert(::strlen(Fmt) == 2 &&
 106          "Format string needs to be two characters long");
 107   assert(::toupper(Fmt[0]) == Fmt[1] &&
 108          "Format string is not in the form \"xX\"");
 109
 110   const char *Like = ::strpbrk(getRecord(ID).Attributes, Fmt);
 111   if (!Like)
 112     return false;
 113
 114   HasVAListArg = (*Like == Fmt[1]);
 115
 116   ++Like;
 117   assert(*Like == ':' && "Format specifier must be followed by a ':'");
 118   ++Like;
 119
 120   assert(::strchr(Like, ':') && "Format specifier must end with a ':'");
 121   FormatIdx = ::strtol(Like, nullptr, 10);
 122   return true;
 123 }
 124
 125 bool Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx,
 126                                     bool &HasVAListArg) {
 127   return isLike(ID, FormatIdx, HasVAListArg, "pP");
 128 }
 129
 130 bool Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx,
 131                                    bool &HasVAListArg) {
 132   return isLike(ID, FormatIdx, HasVAListArg, "sS");
 133 }