Builtins.cpp revision c89f02afb018316a0c36bf62b2cb75d420f2fff3 
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"
19using namespace clang;
20
21static const Builtin::Info BuiltinInfo[] = {
22  { "not a builtin function", 0, 0, 0, ALL_LANGUAGES },
23#define BUILTIN(ID, TYPE, ATTRS) { #ID, TYPE, ATTRS, 0, ALL_LANGUAGES },
24#define LIBBUILTIN(ID, TYPE, ATTRS, HEADER, BUILTIN_LANG) { #ID, TYPE, ATTRS, HEADER,\
25                                                            BUILTIN_LANG },
26#include "clang/Basic/Builtins.def"
27};
28
29const Builtin::Info &Builtin::Context::GetRecord(unsigned ID) const {
30  if (ID < Builtin::FirstTSBuiltin)
31    return BuiltinInfo[ID];
32  assert(ID - Builtin::FirstTSBuiltin < NumTSRecords && "Invalid builtin ID!");
33  return TSRecords[ID - Builtin::FirstTSBuiltin];
34}
35
36Builtin::Context::Context() {
37  // Get the target specific builtins from the target.
38  TSRecords = 0;
39  NumTSRecords = 0;
40}
41
42void Builtin::Context::InitializeTarget(const TargetInfo &Target) {
43  assert(NumTSRecords == 0 && "Already initialized target?");
44  Target.getTargetBuiltins(TSRecords, NumTSRecords);
45}
46
47/// InitializeBuiltins - Mark the identifiers for all the builtins with their
48/// appropriate builtin ID # and mark any non-portable builtin identifiers as
49/// such.
50void Builtin::Context::InitializeBuiltins(IdentifierTable &Table,
51                                          const LangOptions& LangOpts) {
52  // Step #1: mark all target-independent builtins with their ID's.
53  for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
54    if ((!LangOpts.NoBuiltin || !strchr(BuiltinInfo[i].Attributes, 'f')) &&
55        (LangOpts.GNUMode || !(BuiltinInfo[i].builtin_lang & GNU_LANG)) &&
56        (LangOpts.ObjC1 || BuiltinInfo[i].builtin_lang != OBJC_LANG))
57      Table.get(BuiltinInfo[i].Name).setBuiltinID(i);
58
59  // Step #2: Register target-specific builtins.
60  for (unsigned i = 0, e = NumTSRecords; i != e; ++i)
61    if (!LangOpts.NoBuiltin || !strchr(TSRecords[i].Attributes, 'f'))
62      Table.get(TSRecords[i].Name).setBuiltinID(i+Builtin::FirstTSBuiltin);
63}
64
65void
66Builtin::Context::GetBuiltinNames(SmallVectorImpl<const char *> &Names,
67                                  bool NoBuiltins) {
68  // Final all target-independent names
69  for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
70    if (!NoBuiltins || !strchr(BuiltinInfo[i].Attributes, 'f'))
71      Names.push_back(BuiltinInfo[i].Name);
72
73  // Find target-specific names.
74  for (unsigned i = 0, e = NumTSRecords; i != e; ++i)
75    if (!NoBuiltins || !strchr(TSRecords[i].Attributes, 'f'))
76      Names.push_back(TSRecords[i].Name);
77}
78
79void Builtin::Context::ForgetBuiltin(unsigned ID, IdentifierTable &Table) {
80  Table.get(GetRecord(ID).Name).setBuiltinID(0);
81}
82
83bool
84Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx,
85                               bool &HasVAListArg) {
86  const char *Printf = strpbrk(GetRecord(ID).Attributes, "pP");
87  if (!Printf)
88    return false;
89
90  HasVAListArg = (*Printf == 'P');
91
92  ++Printf;
93  assert(*Printf == ':' && "p or P specifier must have be followed by a ':'");
94  ++Printf;
95
96  assert(strchr(Printf, ':') && "printf specifier must end with a ':'");
97  FormatIdx = strtol(Printf, 0, 10);
98  return true;
99}
100
101// FIXME: Refactor with isPrintfLike.
102bool
103Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx,
104                              bool &HasVAListArg) {
105  const char *Scanf = strpbrk(GetRecord(ID).Attributes, "sS");
106  if (!Scanf)
107    return false;
108
109  HasVAListArg = (*Scanf == 'S');
110
111  ++Scanf;
112  assert(*Scanf == ':' && "s or S specifier must have be followed by a ':'");
113  ++Scanf;
114
115  assert(strchr(Scanf, ':') && "printf specifier must end with a ':'");
116  FormatIdx = strtol(Scanf, 0, 10);
117  return true;
118}
119
120