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::builtinIsSupported(const Builtin::Info &BuiltinInfo,
  52                                           const LangOptions &LangOpts) {
  53   bool BuiltinsUnsupported = LangOpts.NoBuiltin &&
  54                              strchr(BuiltinInfo.Attributes, 'f');
  55   bool MathBuiltinsUnsupported =
  56     LangOpts.NoMathBuiltin && BuiltinInfo.HeaderName &&
  57     llvm::StringRef(BuiltinInfo.HeaderName).equals("math.h");
  58   bool GnuModeUnsupported = !LangOpts.GNUMode && (BuiltinInfo.Langs & GNU_LANG);
  59   bool MSModeUnsupported =
  60       !LangOpts.MicrosoftExt && (BuiltinInfo.Langs & MS_LANG);
  61   bool ObjCUnsupported = !LangOpts.ObjC1 && BuiltinInfo.Langs == OBJC_LANG;
  62   return !BuiltinsUnsupported && !MathBuiltinsUnsupported &&
  63          !GnuModeUnsupported && !MSModeUnsupported && !ObjCUnsupported;
  64 }
  65
  66 /// initializeBuiltins - Mark the identifiers for all the builtins with their
  67 /// appropriate builtin ID # and mark any non-portable builtin identifiers as
  68 /// such.
  69 void Builtin::Context::initializeBuiltins(IdentifierTable &Table,
  70                                           const LangOptions& LangOpts) {
  71   // Step #1: mark all target-independent builtins with their ID's.
  72   for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
  73     if (builtinIsSupported(BuiltinInfo[i], LangOpts)) {
  74       Table.get(BuiltinInfo[i].Name).setBuiltinID(i);
  75     }
  76
  77   // Step #2: Register target-specific builtins.
  78   for (unsigned i = 0, e = TSRecords.size(); i != e; ++i)
  79     if (builtinIsSupported(TSRecords[i], LangOpts))
  80       Table.get(TSRecords[i].Name).setBuiltinID(i + Builtin::FirstTSBuiltin);
  81
  82   // Step #3: Register target-specific builtins for AuxTarget.
  83   for (unsigned i = 0, e = AuxTSRecords.size(); i != e; ++i)
  84     Table.get(AuxTSRecords[i].Name)
  85         .setBuiltinID(i + Builtin::FirstTSBuiltin + TSRecords.size());
  86 }
  87
  88 void Builtin::Context::forgetBuiltin(unsigned ID, IdentifierTable &Table) {
  89   Table.get(getRecord(ID).Name).setBuiltinID(0);
  90 }
  91
  92 bool Builtin::Context::isLike(unsigned ID, unsigned &FormatIdx,
  93                               bool &HasVAListArg, const char *Fmt) const {
  94   assert(Fmt && "Not passed a format string");
  95   assert(::strlen(Fmt) == 2 &&
  96          "Format string needs to be two characters long");
  97   assert(::toupper(Fmt[0]) == Fmt[1] &&
  98          "Format string is not in the form \"xX\"");
  99
 100   const char *Like = ::strpbrk(getRecord(ID).Attributes, Fmt);
 101   if (!Like)
 102     return false;
 103
 104   HasVAListArg = (*Like == Fmt[1]);
 105
 106   ++Like;
 107   assert(*Like == ':' && "Format specifier must be followed by a ':'");
 108   ++Like;
 109
 110   assert(::strchr(Like, ':') && "Format specifier must end with a ':'");
 111   FormatIdx = ::strtol(Like, nullptr, 10);
 112   return true;
 113 }
 114
 115 bool Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx,
 116                                     bool &HasVAListArg) {
 117   return isLike(ID, FormatIdx, HasVAListArg, "pP");
 118 }
 119
 120 bool Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx,
 121                                    bool &HasVAListArg) {
 122   return isLike(ID, FormatIdx, HasVAListArg, "sS");
 123 }