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/TargetInfo.h"
  17 #include "clang/Basic/LangOptions.h"
  18 using namespace clang;
  19
  20 static const Builtin::Info BuiltinInfo[] = {
  21   { "not a builtin function", 0, 0, 0, ALL_LANGUAGES, false },
  22 #define BUILTIN(ID, TYPE, ATTRS) { #ID, TYPE, ATTRS, 0, ALL_LANGUAGES, false },
  23 #define LIBBUILTIN(ID, TYPE, ATTRS, HEADER, BUILTIN_LANG) { #ID, TYPE, ATTRS, HEADER,\
  24                                                             BUILTIN_LANG, false },
  25 #include "clang/Basic/Builtins.def"
  26 };
  27
  28 const Builtin::Info &Builtin::Context::GetRecord(unsigned ID) const {
  29   if (ID < Builtin::FirstTSBuiltin)
  30     return BuiltinInfo[ID];
  31   assert(ID - Builtin::FirstTSBuiltin < NumTSRecords && "Invalid builtin ID!");
  32   return TSRecords[ID - Builtin::FirstTSBuiltin];
  33 }
  34
  35 Builtin::Context::Context(const TargetInfo &Target) {
  36   // Get the target specific builtins from the target.
  37   TSRecords = 0;
  38   NumTSRecords = 0;
  39   Target.getTargetBuiltins(TSRecords, NumTSRecords);
  40 }
  41
  42 /// InitializeBuiltins - Mark the identifiers for all the builtins with their
  43 /// appropriate builtin ID # and mark any non-portable builtin identifiers as
  44 /// such.
  45 void Builtin::Context::InitializeBuiltins(IdentifierTable &Table,
  46                                           const LangOptions& LangOpts) {
  47   // Step #1: mark all target-independent builtins with their ID's.
  48   for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
  49     if (!BuiltinInfo[i].Suppressed &&
  50         (!LangOpts.NoBuiltin || !strchr(BuiltinInfo[i].Attributes, 'f'))) {
  51       if (LangOpts.ObjC1 ||
  52           BuiltinInfo[i].builtin_lang != clang::OBJC_LANG)
  53         Table.get(BuiltinInfo[i].Name).setBuiltinID(i);
  54     }
  55
  56   // Step #2: Register target-specific builtins.
  57   for (unsigned i = 0, e = NumTSRecords; i != e; ++i)
  58     if (!TSRecords[i].Suppressed &&
  59         (!LangOpts.NoBuiltin ||
  60          (TSRecords[i].Attributes &&
  61           !strchr(TSRecords[i].Attributes, 'f'))))
  62       Table.get(TSRecords[i].Name).setBuiltinID(i+Builtin::FirstTSBuiltin);
  63 }
  64
  65 void
  66 Builtin::Context::GetBuiltinNames(llvm::SmallVectorImpl<const char *> &Names,
  67                                   bool NoBuiltins) {
  68   // Final all target-independent names
  69   for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
  70     if (!BuiltinInfo[i].Suppressed &&
  71         (!NoBuiltins || !strchr(BuiltinInfo[i].Attributes, 'f')))
  72       Names.push_back(BuiltinInfo[i].Name);
  73
  74   // Find target-specific names.
  75   for (unsigned i = 0, e = NumTSRecords; i != e; ++i)
  76     if (!TSRecords[i].Suppressed &&
  77         (!NoBuiltins ||
  78          (TSRecords[i].Attributes &&
  79           !strchr(TSRecords[i].Attributes, 'f'))))
  80       Names.push_back(TSRecords[i].Name);
  81 }
  82
  83 void Builtin::Context::ForgetBuiltin(unsigned ID, IdentifierTable &Table) {
  84   Table.get(GetRecord(ID).Name).setBuiltinID(0);
  85 }
  86
  87 bool
  88 Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx,
  89                                bool &HasVAListArg) {
  90   const char *Printf = strpbrk(GetRecord(ID).Attributes, "pP");
  91   if (!Printf)
  92     return false;
  93
  94   HasVAListArg = (*Printf == 'P');
  95
  96   ++Printf;
  97   assert(*Printf == ':' && "p or P specifier must have be followed by a ':'");
  98   ++Printf;
  99
 100   assert(strchr(Printf, ':') && "printf specifier must end with a ':'");
 101   FormatIdx = strtol(Printf, 0, 10);
 102   return true;
 103 }
 104
 105 // FIXME: Refactor with isPrintfLike.
 106 bool
 107 Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx,
 108                               bool &HasVAListArg) {
 109   const char *Scanf = strpbrk(GetRecord(ID).Attributes, "sS");
 110   if (!Scanf)
 111     return false;
 112
 113   HasVAListArg = (*Scanf == 'S');
 114
 115   ++Scanf;
 116   assert(*Scanf == ':' && "s or S specifier must have be followed by a ':'");
 117   ++Scanf;
 118
 119   assert(strchr(Scanf, ':') && "printf specifier must end with a ':'");
 120   FormatIdx = strtol(Scanf, 0, 10);
 121   return true;
 122 }
 123
 124