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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(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 (!LangOpts.NoBuiltin || !strchr(BuiltinInfo[i].Attributes, 'f')) {
     50       if (LangOpts.ObjC1 ||
     51           BuiltinInfo[i].builtin_lang != clang::OBJC_LANG)
     52         Table.get(BuiltinInfo[i].Name).setBuiltinID(i);
     53     }
     54 
     55   // Step #2: Register target-specific builtins.
     56   for (unsigned i = 0, e = NumTSRecords; i != e; ++i)
     57     if (!LangOpts.NoBuiltin || !strchr(TSRecords[i].Attributes, 'f'))
     58       Table.get(TSRecords[i].Name).setBuiltinID(i+Builtin::FirstTSBuiltin);
     59 }
     60 
     61 void
     62 Builtin::Context::GetBuiltinNames(llvm::SmallVectorImpl<const char *> &Names,
     63                                   bool NoBuiltins) {
     64   // Final all target-independent names
     65   for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
     66     if (!NoBuiltins || !strchr(BuiltinInfo[i].Attributes, 'f'))
     67       Names.push_back(BuiltinInfo[i].Name);
     68 
     69   // Find target-specific names.
     70   for (unsigned i = 0, e = NumTSRecords; i != e; ++i)
     71     if (!NoBuiltins || !strchr(TSRecords[i].Attributes, 'f'))
     72       Names.push_back(TSRecords[i].Name);
     73 }
     74 
     75 void Builtin::Context::ForgetBuiltin(unsigned ID, IdentifierTable &Table) {
     76   Table.get(GetRecord(ID).Name).setBuiltinID(0);
     77 }
     78 
     79 bool
     80 Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx,
     81                                bool &HasVAListArg) {
     82   const char *Printf = strpbrk(GetRecord(ID).Attributes, "pP");
     83   if (!Printf)
     84     return false;
     85 
     86   HasVAListArg = (*Printf == 'P');
     87 
     88   ++Printf;
     89   assert(*Printf == ':' && "p or P specifier must have be followed by a ':'");
     90   ++Printf;
     91 
     92   assert(strchr(Printf, ':') && "printf specifier must end with a ':'");
     93   FormatIdx = strtol(Printf, 0, 10);
     94   return true;
     95 }
     96 
     97 // FIXME: Refactor with isPrintfLike.
     98 bool
     99 Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx,
    100                               bool &HasVAListArg) {
    101   const char *Scanf = strpbrk(GetRecord(ID).Attributes, "sS");
    102   if (!Scanf)
    103     return false;
    104 
    105   HasVAListArg = (*Scanf == 'S');
    106 
    107   ++Scanf;
    108   assert(*Scanf == ':' && "s or S specifier must have be followed by a ':'");
    109   ++Scanf;
    110 
    111   assert(strchr(Scanf, ':') && "printf specifier must end with a ':'");
    112   FormatIdx = strtol(Scanf, 0, 10);
    113   return true;
    114 }
    115 
    116