• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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/StringRef.h"
19 using namespace clang;
20 
21 static const Builtin::Info BuiltinInfo[] = {
22   { "not a builtin function", nullptr, nullptr, nullptr, ALL_LANGUAGES,nullptr},
23 #define BUILTIN(ID, TYPE, ATTRS)                                               \
24   { #ID, TYPE, ATTRS, nullptr, ALL_LANGUAGES, nullptr },
25 #define LANGBUILTIN(ID, TYPE, ATTRS, LANGS)                                    \
26   { #ID, TYPE, ATTRS, nullptr, LANGS, nullptr },
27 #define LIBBUILTIN(ID, TYPE, ATTRS, HEADER, LANGS)                             \
28   { #ID, TYPE, ATTRS, HEADER, LANGS, nullptr },
29 #include "clang/Basic/Builtins.def"
30 };
31 
getRecord(unsigned ID) const32 const Builtin::Info &Builtin::Context::getRecord(unsigned ID) const {
33   if (ID < Builtin::FirstTSBuiltin)
34     return BuiltinInfo[ID];
35   assert(((ID - Builtin::FirstTSBuiltin) <
36           (TSRecords.size() + AuxTSRecords.size())) &&
37          "Invalid builtin ID!");
38   if (isAuxBuiltinID(ID))
39     return AuxTSRecords[getAuxBuiltinID(ID) - Builtin::FirstTSBuiltin];
40   return TSRecords[ID - Builtin::FirstTSBuiltin];
41 }
42 
InitializeTarget(const TargetInfo & Target,const TargetInfo * AuxTarget)43 void Builtin::Context::InitializeTarget(const TargetInfo &Target,
44                                         const TargetInfo *AuxTarget) {
45   assert(TSRecords.empty() && "Already initialized target?");
46   TSRecords = Target.getTargetBuiltins();
47   if (AuxTarget)
48     AuxTSRecords = AuxTarget->getTargetBuiltins();
49 }
50 
isBuiltinFunc(const char * Name)51 bool Builtin::Context::isBuiltinFunc(const char *Name) {
52   StringRef FuncName(Name);
53   for (unsigned i = Builtin::NotBuiltin + 1; i != Builtin::FirstTSBuiltin; ++i)
54     if (FuncName.equals(BuiltinInfo[i].Name))
55       return strchr(BuiltinInfo[i].Attributes, 'f') != nullptr;
56 
57   return false;
58 }
59 
builtinIsSupported(const Builtin::Info & BuiltinInfo,const LangOptions & LangOpts)60 bool Builtin::Context::builtinIsSupported(const Builtin::Info &BuiltinInfo,
61                                           const LangOptions &LangOpts) {
62   bool BuiltinsUnsupported =
63       (LangOpts.NoBuiltin || LangOpts.isNoBuiltinFunc(BuiltinInfo.Name)) &&
64       strchr(BuiltinInfo.Attributes, 'f');
65   bool MathBuiltinsUnsupported =
66     LangOpts.NoMathBuiltin && BuiltinInfo.HeaderName &&
67     llvm::StringRef(BuiltinInfo.HeaderName).equals("math.h");
68   bool GnuModeUnsupported = !LangOpts.GNUMode && (BuiltinInfo.Langs & GNU_LANG);
69   bool MSModeUnsupported =
70       !LangOpts.MicrosoftExt && (BuiltinInfo.Langs & MS_LANG);
71   bool ObjCUnsupported = !LangOpts.ObjC1 && BuiltinInfo.Langs == OBJC_LANG;
72   bool OclCUnsupported = LangOpts.OpenCLVersion != 200 &&
73                          BuiltinInfo.Langs == OCLC20_LANG;
74   return !BuiltinsUnsupported && !MathBuiltinsUnsupported && !OclCUnsupported &&
75          !GnuModeUnsupported && !MSModeUnsupported && !ObjCUnsupported;
76 }
77 
78 /// initializeBuiltins - Mark the identifiers for all the builtins with their
79 /// appropriate builtin ID # and mark any non-portable builtin identifiers as
80 /// such.
initializeBuiltins(IdentifierTable & Table,const LangOptions & LangOpts)81 void Builtin::Context::initializeBuiltins(IdentifierTable &Table,
82                                           const LangOptions& LangOpts) {
83   // Step #1: mark all target-independent builtins with their ID's.
84   for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
85     if (builtinIsSupported(BuiltinInfo[i], LangOpts)) {
86       Table.get(BuiltinInfo[i].Name).setBuiltinID(i);
87     }
88 
89   // Step #2: Register target-specific builtins.
90   for (unsigned i = 0, e = TSRecords.size(); i != e; ++i)
91     if (builtinIsSupported(TSRecords[i], LangOpts))
92       Table.get(TSRecords[i].Name).setBuiltinID(i + Builtin::FirstTSBuiltin);
93 
94   // Step #3: Register target-specific builtins for AuxTarget.
95   for (unsigned i = 0, e = AuxTSRecords.size(); i != e; ++i)
96     Table.get(AuxTSRecords[i].Name)
97         .setBuiltinID(i + Builtin::FirstTSBuiltin + TSRecords.size());
98 }
99 
forgetBuiltin(unsigned ID,IdentifierTable & Table)100 void Builtin::Context::forgetBuiltin(unsigned ID, IdentifierTable &Table) {
101   Table.get(getRecord(ID).Name).setBuiltinID(0);
102 }
103 
isLike(unsigned ID,unsigned & FormatIdx,bool & HasVAListArg,const char * Fmt) const104 bool Builtin::Context::isLike(unsigned ID, unsigned &FormatIdx,
105                               bool &HasVAListArg, const char *Fmt) const {
106   assert(Fmt && "Not passed a format string");
107   assert(::strlen(Fmt) == 2 &&
108          "Format string needs to be two characters long");
109   assert(::toupper(Fmt[0]) == Fmt[1] &&
110          "Format string is not in the form \"xX\"");
111 
112   const char *Like = ::strpbrk(getRecord(ID).Attributes, Fmt);
113   if (!Like)
114     return false;
115 
116   HasVAListArg = (*Like == Fmt[1]);
117 
118   ++Like;
119   assert(*Like == ':' && "Format specifier must be followed by a ':'");
120   ++Like;
121 
122   assert(::strchr(Like, ':') && "Format specifier must end with a ':'");
123   FormatIdx = ::strtol(Like, nullptr, 10);
124   return true;
125 }
126 
isPrintfLike(unsigned ID,unsigned & FormatIdx,bool & HasVAListArg)127 bool Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx,
128                                     bool &HasVAListArg) {
129   return isLike(ID, FormatIdx, HasVAListArg, "pP");
130 }
131 
isScanfLike(unsigned ID,unsigned & FormatIdx,bool & HasVAListArg)132 bool Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx,
133                                    bool &HasVAListArg) {
134   return isLike(ID, FormatIdx, HasVAListArg, "sS");
135 }
136