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