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/SmallVector.h"
  19 #include "llvm/ADT/StringRef.h"
  20 using namespace clang;
  21
  22 static const Builtin::Info BuiltinInfo[] = {
  23   { "not a builtin function", nullptr, nullptr, nullptr, ALL_LANGUAGES},
  24 #define BUILTIN(ID, TYPE, ATTRS) { #ID, TYPE, ATTRS, 0, ALL_LANGUAGES },
  25 #define LANGBUILTIN(ID, TYPE, ATTRS, BUILTIN_LANG) { #ID, TYPE, ATTRS, 0, BUILTIN_LANG },
  26 #define LIBBUILTIN(ID, TYPE, ATTRS, HEADER, BUILTIN_LANG) { #ID, TYPE, ATTRS, HEADER,\
  27                                                             BUILTIN_LANG },
  28 #include "clang/Basic/Builtins.def"
  29 };
  30
  31 const Builtin::Info &Builtin::Context::GetRecord(unsigned ID) const {
  32   if (ID < Builtin::FirstTSBuiltin)
  33     return BuiltinInfo[ID];
  34   assert(ID - Builtin::FirstTSBuiltin < NumTSRecords && "Invalid builtin ID!");
  35   return TSRecords[ID - Builtin::FirstTSBuiltin];
  36 }
  37
  38 Builtin::Context::Context() {
  39   // Get the target specific builtins from the target.
  40   TSRecords = nullptr;
  41   NumTSRecords = 0;
  42 }
  43
  44 void Builtin::Context::InitializeTarget(const TargetInfo &Target) {
  45   assert(NumTSRecords == 0 && "Already initialized target?");
  46   Target.getTargetBuiltins(TSRecords, NumTSRecords);
  47 }
  48
  49 bool Builtin::Context::BuiltinIsSupported(const Builtin::Info &BuiltinInfo,
  50                                           const LangOptions &LangOpts) {
  51   bool BuiltinsUnsupported = LangOpts.NoBuiltin &&
  52                              strchr(BuiltinInfo.Attributes, 'f');
  53   bool MathBuiltinsUnsupported =
  54     LangOpts.NoMathBuiltin && BuiltinInfo.HeaderName &&
  55     llvm::StringRef(BuiltinInfo.HeaderName).equals("math.h");
  56   bool GnuModeUnsupported = !LangOpts.GNUMode &&
  57                             (BuiltinInfo.builtin_lang & GNU_LANG);
  58   bool MSModeUnsupported = !LangOpts.MicrosoftExt &&
  59                            (BuiltinInfo.builtin_lang & MS_LANG);
  60   bool ObjCUnsupported = !LangOpts.ObjC1 &&
  61                          BuiltinInfo.builtin_lang == 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 = NumTSRecords; i != e; ++i)
  79     if (BuiltinIsSupported(TSRecords[i], LangOpts))
  80       Table.get(TSRecords[i].Name).setBuiltinID(i+Builtin::FirstTSBuiltin);
  81 }
  82
  83 void
  84 Builtin::Context::GetBuiltinNames(SmallVectorImpl<const char *> &Names) {
  85   // Final all target-independent names
  86   for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
  87     if (!strchr(BuiltinInfo[i].Attributes, 'f'))
  88       Names.push_back(BuiltinInfo[i].Name);
  89
  90   // Find target-specific names.
  91   for (unsigned i = 0, e = NumTSRecords; i != e; ++i)
  92     if (!strchr(TSRecords[i].Attributes, 'f'))
  93       Names.push_back(TSRecords[i].Name);
  94 }
  95
  96 void Builtin::Context::ForgetBuiltin(unsigned ID, IdentifierTable &Table) {
  97   Table.get(GetRecord(ID).Name).setBuiltinID(0);
  98 }
  99
 100 bool Builtin::Context::isLike(unsigned ID, unsigned &FormatIdx,
 101                               bool &HasVAListArg, const char *Fmt) const {
 102   assert(Fmt && "Not passed a format string");
 103   assert(::strlen(Fmt) == 2 &&
 104          "Format string needs to be two characters long");
 105   assert(::toupper(Fmt[0]) == Fmt[1] &&
 106          "Format string is not in the form \"xX\"");
 107
 108   const char *Like = ::strpbrk(GetRecord(ID).Attributes, Fmt);
 109   if (!Like)
 110     return false;
 111
 112   HasVAListArg = (*Like == Fmt[1]);
 113
 114   ++Like;
 115   assert(*Like == ':' && "Format specifier must be followed by a ':'");
 116   ++Like;
 117
 118   assert(::strchr(Like, ':') && "Format specifier must end with a ':'");
 119   FormatIdx = ::strtol(Like, nullptr, 10);
 120   return true;
 121 }
 122
 123 bool Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx,
 124                                     bool &HasVAListArg) {
 125   return isLike(ID, FormatIdx, HasVAListArg, "pP");
 126 }
 127
 128 bool Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx,
 129                                    bool &HasVAListArg) {
 130   return isLike(ID, FormatIdx, HasVAListArg, "sS");
 131 }