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      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 },
     22 #define BUILTIN(ID, TYPE, ATTRS) { #ID, TYPE, ATTRS, 0, ALL_LANGUAGES },
     23 #define LIBBUILTIN(ID, TYPE, ATTRS, HEADER, BUILTIN_LANG) { #ID, TYPE, ATTRS, HEADER,\
     24                                                             BUILTIN_LANG },
     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() {
     36   // Get the target specific builtins from the target.
     37   TSRecords = 0;
     38   NumTSRecords = 0;
     39 }
     40 
     41 void Builtin::Context::InitializeTarget(const TargetInfo &Target) {
     42   assert(NumTSRecords == 0 && "Already initialized target?");
     43   Target.getTargetBuiltins(TSRecords, NumTSRecords);
     44 }
     45 
     46 /// InitializeBuiltins - Mark the identifiers for all the builtins with their
     47 /// appropriate builtin ID # and mark any non-portable builtin identifiers as
     48 /// such.
     49 void Builtin::Context::InitializeBuiltins(IdentifierTable &Table,
     50                                           const LangOptions& LangOpts) {
     51   // Step #1: mark all target-independent builtins with their ID's.
     52   for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
     53     if (!LangOpts.NoBuiltin || !strchr(BuiltinInfo[i].Attributes, 'f')) {
     54       if (LangOpts.ObjC1 ||
     55           BuiltinInfo[i].builtin_lang != clang::OBJC_LANG)
     56         Table.get(BuiltinInfo[i].Name).setBuiltinID(i);
     57     }
     58 
     59   // Step #2: Register target-specific builtins.
     60   for (unsigned i = 0, e = NumTSRecords; i != e; ++i)
     61     if (!LangOpts.NoBuiltin || !strchr(TSRecords[i].Attributes, 'f'))
     62       Table.get(TSRecords[i].Name).setBuiltinID(i+Builtin::FirstTSBuiltin);
     63 }
     64 
     65 void
     66 Builtin::Context::GetBuiltinNames(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 (!NoBuiltins || !strchr(BuiltinInfo[i].Attributes, 'f'))
     71       Names.push_back(BuiltinInfo[i].Name);
     72 
     73   // Find target-specific names.
     74   for (unsigned i = 0, e = NumTSRecords; i != e; ++i)
     75     if (!NoBuiltins || !strchr(TSRecords[i].Attributes, 'f'))
     76       Names.push_back(TSRecords[i].Name);
     77 }
     78 
     79 void Builtin::Context::ForgetBuiltin(unsigned ID, IdentifierTable &Table) {
     80   Table.get(GetRecord(ID).Name).setBuiltinID(0);
     81 }
     82 
     83 bool
     84 Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx,
     85                                bool &HasVAListArg) {
     86   const char *Printf = strpbrk(GetRecord(ID).Attributes, "pP");
     87   if (!Printf)
     88     return false;
     89 
     90   HasVAListArg = (*Printf == 'P');
     91 
     92   ++Printf;
     93   assert(*Printf == ':' && "p or P specifier must have be followed by a ':'");
     94   ++Printf;
     95 
     96   assert(strchr(Printf, ':') && "printf specifier must end with a ':'");
     97   FormatIdx = strtol(Printf, 0, 10);
     98   return true;
     99 }
    100 
    101 // FIXME: Refactor with isPrintfLike.
    102 bool
    103 Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx,
    104                               bool &HasVAListArg) {
    105   const char *Scanf = strpbrk(GetRecord(ID).Attributes, "sS");
    106   if (!Scanf)
    107     return false;
    108 
    109   HasVAListArg = (*Scanf == 'S');
    110 
    111   ++Scanf;
    112   assert(*Scanf == ':' && "s or S specifier must have be followed by a ':'");
    113   ++Scanf;
    114 
    115   assert(strchr(Scanf, ':') && "printf specifier must end with a ':'");
    116   FormatIdx = strtol(Scanf, 0, 10);
    117   return true;
    118 }
    119 
    120