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/SmallVector.h"
19 #include "llvm/ADT/StringRef.h"
20 using namespace clang;
21
22 static const Builtin::Info BuiltinInfo[] = {
23 { "not a builtin function", nullptr, nullptr, nullptr, ALL_LANGUAGES},
24 #define BUILTIN(ID, TYPE, ATTRS) { #ID, TYPE, ATTRS, 0, ALL_LANGUAGES },
25 #define LANGBUILTIN(ID, TYPE, ATTRS, BUILTIN_LANG) { #ID, TYPE, ATTRS, 0, BUILTIN_LANG },
26 #define LIBBUILTIN(ID, TYPE, ATTRS, HEADER, BUILTIN_LANG) { #ID, TYPE, ATTRS, HEADER,\
27 BUILTIN_LANG },
28 #include "clang/Basic/Builtins.def"
29 };
30
GetRecord(unsigned ID) const31 const Builtin::Info &Builtin::Context::GetRecord(unsigned ID) const {
32 if (ID < Builtin::FirstTSBuiltin)
33 return BuiltinInfo[ID];
34 assert(ID - Builtin::FirstTSBuiltin < NumTSRecords && "Invalid builtin ID!");
35 return TSRecords[ID - Builtin::FirstTSBuiltin];
36 }
37
Context()38 Builtin::Context::Context() {
39 // Get the target specific builtins from the target.
40 TSRecords = nullptr;
41 NumTSRecords = 0;
42 }
43
InitializeTarget(const TargetInfo & Target)44 void Builtin::Context::InitializeTarget(const TargetInfo &Target) {
45 assert(NumTSRecords == 0 && "Already initialized target?");
46 Target.getTargetBuiltins(TSRecords, NumTSRecords);
47 }
48
BuiltinIsSupported(const Builtin::Info & BuiltinInfo,const LangOptions & LangOpts)49 bool Builtin::Context::BuiltinIsSupported(const Builtin::Info &BuiltinInfo,
50 const LangOptions &LangOpts) {
51 bool BuiltinsUnsupported = LangOpts.NoBuiltin &&
52 strchr(BuiltinInfo.Attributes, 'f');
53 bool MathBuiltinsUnsupported =
54 LangOpts.NoMathBuiltin && BuiltinInfo.HeaderName &&
55 llvm::StringRef(BuiltinInfo.HeaderName).equals("math.h");
56 bool GnuModeUnsupported = !LangOpts.GNUMode &&
57 (BuiltinInfo.builtin_lang & GNU_LANG);
58 bool MSModeUnsupported = !LangOpts.MicrosoftExt &&
59 (BuiltinInfo.builtin_lang & MS_LANG);
60 bool ObjCUnsupported = !LangOpts.ObjC1 &&
61 BuiltinInfo.builtin_lang == OBJC_LANG;
62 return !BuiltinsUnsupported && !MathBuiltinsUnsupported &&
63 !GnuModeUnsupported && !MSModeUnsupported && !ObjCUnsupported;
64 }
65
66 /// InitializeBuiltins - Mark the identifiers for all the builtins with their
67 /// appropriate builtin ID # and mark any non-portable builtin identifiers as
68 /// such.
InitializeBuiltins(IdentifierTable & Table,const LangOptions & LangOpts)69 void Builtin::Context::InitializeBuiltins(IdentifierTable &Table,
70 const LangOptions& LangOpts) {
71 // Step #1: mark all target-independent builtins with their ID's.
72 for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
73 if (BuiltinIsSupported(BuiltinInfo[i], LangOpts)) {
74 Table.get(BuiltinInfo[i].Name).setBuiltinID(i);
75 }
76
77 // Step #2: Register target-specific builtins.
78 for (unsigned i = 0, e = NumTSRecords; i != e; ++i)
79 if (BuiltinIsSupported(TSRecords[i], LangOpts))
80 Table.get(TSRecords[i].Name).setBuiltinID(i+Builtin::FirstTSBuiltin);
81 }
82
83 void
GetBuiltinNames(SmallVectorImpl<const char * > & Names)84 Builtin::Context::GetBuiltinNames(SmallVectorImpl<const char *> &Names) {
85 // Final all target-independent names
86 for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
87 if (!strchr(BuiltinInfo[i].Attributes, 'f'))
88 Names.push_back(BuiltinInfo[i].Name);
89
90 // Find target-specific names.
91 for (unsigned i = 0, e = NumTSRecords; i != e; ++i)
92 if (!strchr(TSRecords[i].Attributes, 'f'))
93 Names.push_back(TSRecords[i].Name);
94 }
95
ForgetBuiltin(unsigned ID,IdentifierTable & Table)96 void Builtin::Context::ForgetBuiltin(unsigned ID, IdentifierTable &Table) {
97 Table.get(GetRecord(ID).Name).setBuiltinID(0);
98 }
99
isLike(unsigned ID,unsigned & FormatIdx,bool & HasVAListArg,const char * Fmt) const100 bool Builtin::Context::isLike(unsigned ID, unsigned &FormatIdx,
101 bool &HasVAListArg, const char *Fmt) const {
102 assert(Fmt && "Not passed a format string");
103 assert(::strlen(Fmt) == 2 &&
104 "Format string needs to be two characters long");
105 assert(::toupper(Fmt[0]) == Fmt[1] &&
106 "Format string is not in the form \"xX\"");
107
108 const char *Like = ::strpbrk(GetRecord(ID).Attributes, Fmt);
109 if (!Like)
110 return false;
111
112 HasVAListArg = (*Like == Fmt[1]);
113
114 ++Like;
115 assert(*Like == ':' && "Format specifier must be followed by a ':'");
116 ++Like;
117
118 assert(::strchr(Like, ':') && "Format specifier must end with a ':'");
119 FormatIdx = ::strtol(Like, nullptr, 10);
120 return true;
121 }
122
isPrintfLike(unsigned ID,unsigned & FormatIdx,bool & HasVAListArg)123 bool Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx,
124 bool &HasVAListArg) {
125 return isLike(ID, FormatIdx, HasVAListArg, "pP");
126 }
127
isScanfLike(unsigned ID,unsigned & FormatIdx,bool & HasVAListArg)128 bool Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx,
129 bool &HasVAListArg) {
130 return isLike(ID, FormatIdx, HasVAListArg, "sS");
131 }
132