Builtins.cpp revision 263508 
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"
20using namespace clang;
21
22static 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 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
31const 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
38Builtin::Context::Context() {
39  // Get the target specific builtins from the target.
40  TSRecords = 0;
41  NumTSRecords = 0;
42}
43
44void Builtin::Context::InitializeTarget(const TargetInfo &Target) {
45  assert(NumTSRecords == 0 && "Already initialized target?");
46  Target.getTargetBuiltins(TSRecords, NumTSRecords);
47}
48
49bool 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.
69void 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 (!LangOpts.NoBuiltin || !strchr(TSRecords[i].Attributes, 'f'))
80      Table.get(TSRecords[i].Name).setBuiltinID(i+Builtin::FirstTSBuiltin);
81}
82
83void
84Builtin::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
96void Builtin::Context::ForgetBuiltin(unsigned ID, IdentifierTable &Table) {
97  Table.get(GetRecord(ID).Name).setBuiltinID(0);
98}
99
100bool
101Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx,
102                               bool &HasVAListArg) {
103  const char *Printf = strpbrk(GetRecord(ID).Attributes, "pP");
104  if (!Printf)
105    return false;
106
107  HasVAListArg = (*Printf == 'P');
108
109  ++Printf;
110  assert(*Printf == ':' && "p or P specifier must have be followed by a ':'");
111  ++Printf;
112
113  assert(strchr(Printf, ':') && "printf specifier must end with a ':'");
114  FormatIdx = strtol(Printf, 0, 10);
115  return true;
116}
117
118// FIXME: Refactor with isPrintfLike.
119bool
120Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx,
121                              bool &HasVAListArg) {
122  const char *Scanf = strpbrk(GetRecord(ID).Attributes, "sS");
123  if (!Scanf)
124    return false;
125
126  HasVAListArg = (*Scanf == 'S');
127
128  ++Scanf;
129  assert(*Scanf == ':' && "s or S specifier must have be followed by a ':'");
130  ++Scanf;
131
132  assert(strchr(Scanf, ':') && "printf specifier must end with a ':'");
133  FormatIdx = strtol(Scanf, 0, 10);
134  return true;
135}
136
137