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", 0, 0, 0, ALL_LANGUAGES },
24 #define BUILTIN(ID, TYPE, ATTRS) { #ID, TYPE, ATTRS, 0, ALL_LANGUAGES },
25 #define LIBBUILTIN(ID, TYPE, ATTRS, HEADER, BUILTIN_LANG) { #ID, TYPE, ATTRS, HEADER,\
26 BUILTIN_LANG },
27 #include "clang/Basic/Builtins.def"
28 };
29
GetRecord(unsigned ID) const30 const Builtin::Info &Builtin::Context::GetRecord(unsigned ID) const {
31 if (ID < Builtin::FirstTSBuiltin)
32 return BuiltinInfo[ID];
33 assert(ID - Builtin::FirstTSBuiltin < NumTSRecords && "Invalid builtin ID!");
34 return TSRecords[ID - Builtin::FirstTSBuiltin];
35 }
36
Context()37 Builtin::Context::Context() {
38 // Get the target specific builtins from the target.
39 TSRecords = 0;
40 NumTSRecords = 0;
41 }
42
InitializeTarget(const TargetInfo & Target)43 void Builtin::Context::InitializeTarget(const TargetInfo &Target) {
44 assert(NumTSRecords == 0 && "Already initialized target?");
45 Target.getTargetBuiltins(TSRecords, NumTSRecords);
46 }
47
BuiltinIsSupported(const Builtin::Info & BuiltinInfo,const LangOptions & LangOpts)48 bool Builtin::Context::BuiltinIsSupported(const Builtin::Info &BuiltinInfo,
49 const LangOptions &LangOpts) {
50 bool BuiltinsUnsupported = LangOpts.NoBuiltin &&
51 strchr(BuiltinInfo.Attributes, 'f');
52 bool MathBuiltinsUnsupported =
53 LangOpts.NoMathBuiltin && BuiltinInfo.HeaderName &&
54 llvm::StringRef(BuiltinInfo.HeaderName).equals("math.h");
55 bool GnuModeUnsupported = !LangOpts.GNUMode &&
56 (BuiltinInfo.builtin_lang & GNU_LANG);
57 bool ObjCUnsupported = !LangOpts.ObjC1 &&
58 BuiltinInfo.builtin_lang == OBJC_LANG;
59 return !BuiltinsUnsupported && !MathBuiltinsUnsupported &&
60 !GnuModeUnsupported && !ObjCUnsupported;
61 }
62
63 /// InitializeBuiltins - Mark the identifiers for all the builtins with their
64 /// appropriate builtin ID # and mark any non-portable builtin identifiers as
65 /// such.
InitializeBuiltins(IdentifierTable & Table,const LangOptions & LangOpts)66 void Builtin::Context::InitializeBuiltins(IdentifierTable &Table,
67 const LangOptions& LangOpts) {
68 // Step #1: mark all target-independent builtins with their ID's.
69 for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
70 if (BuiltinIsSupported(BuiltinInfo[i], LangOpts)) {
71 Table.get(BuiltinInfo[i].Name).setBuiltinID(i);
72 }
73
74 // Step #2: Register target-specific builtins.
75 for (unsigned i = 0, e = NumTSRecords; i != e; ++i)
76 if (!LangOpts.NoBuiltin || !strchr(TSRecords[i].Attributes, 'f'))
77 Table.get(TSRecords[i].Name).setBuiltinID(i+Builtin::FirstTSBuiltin);
78 }
79
80 void
GetBuiltinNames(SmallVectorImpl<const char * > & Names)81 Builtin::Context::GetBuiltinNames(SmallVectorImpl<const char *> &Names) {
82 // Final all target-independent names
83 for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
84 if (!strchr(BuiltinInfo[i].Attributes, 'f'))
85 Names.push_back(BuiltinInfo[i].Name);
86
87 // Find target-specific names.
88 for (unsigned i = 0, e = NumTSRecords; i != e; ++i)
89 if (!strchr(TSRecords[i].Attributes, 'f'))
90 Names.push_back(TSRecords[i].Name);
91 }
92
ForgetBuiltin(unsigned ID,IdentifierTable & Table)93 void Builtin::Context::ForgetBuiltin(unsigned ID, IdentifierTable &Table) {
94 Table.get(GetRecord(ID).Name).setBuiltinID(0);
95 }
96
97 bool
isPrintfLike(unsigned ID,unsigned & FormatIdx,bool & HasVAListArg)98 Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx,
99 bool &HasVAListArg) {
100 const char *Printf = strpbrk(GetRecord(ID).Attributes, "pP");
101 if (!Printf)
102 return false;
103
104 HasVAListArg = (*Printf == 'P');
105
106 ++Printf;
107 assert(*Printf == ':' && "p or P specifier must have be followed by a ':'");
108 ++Printf;
109
110 assert(strchr(Printf, ':') && "printf specifier must end with a ':'");
111 FormatIdx = strtol(Printf, 0, 10);
112 return true;
113 }
114
115 // FIXME: Refactor with isPrintfLike.
116 bool
isScanfLike(unsigned ID,unsigned & FormatIdx,bool & HasVAListArg)117 Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx,
118 bool &HasVAListArg) {
119 const char *Scanf = strpbrk(GetRecord(ID).Attributes, "sS");
120 if (!Scanf)
121 return false;
122
123 HasVAListArg = (*Scanf == 'S');
124
125 ++Scanf;
126 assert(*Scanf == ':' && "s or S specifier must have be followed by a ':'");
127 ++Scanf;
128
129 assert(strchr(Scanf, ':') && "printf specifier must end with a ':'");
130 FormatIdx = strtol(Scanf, 0, 10);
131 return true;
132 }
133
134