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