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1 //===--- Builtins.cpp - Builtin function implementation -------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file implements various things for builtin functions.
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10 //
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11 //===----------------------------------------------------------------------===//
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12
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13 #include "clang/Basic/Builtins.h"
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14 #include "clang/Basic/IdentifierTable.h"
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15 #include "clang/Basic/LangOptions.h"
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16 #include "clang/Basic/TargetInfo.h"
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17 #include "llvm/ADT/StringRef.h"
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18 using namespace clang;
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19
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20 static const Builtin::Info BuiltinInfo[] = {
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21 { "not a builtin function", nullptr, nullptr, nullptr, ALL_LANGUAGES,nullptr},
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22 #define BUILTIN(ID, TYPE, ATTRS) \
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23 { #ID, TYPE, ATTRS, nullptr, ALL_LANGUAGES, nullptr },
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24 #define LANGBUILTIN(ID, TYPE, ATTRS, LANGS) \
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25 { #ID, TYPE, ATTRS, nullptr, LANGS, nullptr },
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26 #define LIBBUILTIN(ID, TYPE, ATTRS, HEADER, LANGS) \
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27 { #ID, TYPE, ATTRS, HEADER, LANGS, nullptr },
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28 #include "clang/Basic/Builtins.def"
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29 };
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30
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31 const Builtin::Info &Builtin::Context::getRecord(unsigned ID) const {
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32 if (ID < Builtin::FirstTSBuiltin)
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33 return BuiltinInfo[ID];
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34 assert(((ID - Builtin::FirstTSBuiltin) <
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35 (TSRecords.size() + AuxTSRecords.size())) &&
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36 "Invalid builtin ID!");
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37 if (isAuxBuiltinID(ID))
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38 return AuxTSRecords[getAuxBuiltinID(ID) - Builtin::FirstTSBuiltin];
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39 return TSRecords[ID - Builtin::FirstTSBuiltin];
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40 }
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41
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42 void Builtin::Context::InitializeTarget(const TargetInfo &Target,
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43 const TargetInfo *AuxTarget) {
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44 assert(TSRecords.empty() && "Already initialized target?");
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45 TSRecords = Target.getTargetBuiltins();
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46 if (AuxTarget)
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47 AuxTSRecords = AuxTarget->getTargetBuiltins();
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48 }
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49
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50 bool Builtin::Context::isBuiltinFunc(llvm::StringRef FuncName) {
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51 for (unsigned i = Builtin::NotBuiltin + 1; i != Builtin::FirstTSBuiltin; ++i)
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52 if (FuncName.equals(BuiltinInfo[i].Name))
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53 return strchr(BuiltinInfo[i].Attributes, 'f') != nullptr;
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54
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55 return false;
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56 }
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57
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58 bool Builtin::Context::builtinIsSupported(const Builtin::Info &BuiltinInfo,
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59 const LangOptions &LangOpts) {
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60 bool BuiltinsUnsupported =
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61 (LangOpts.NoBuiltin || LangOpts.isNoBuiltinFunc(BuiltinInfo.Name)) &&
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62 strchr(BuiltinInfo.Attributes, 'f');
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63 bool MathBuiltinsUnsupported =
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64 LangOpts.NoMathBuiltin && BuiltinInfo.HeaderName &&
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65 llvm::StringRef(BuiltinInfo.HeaderName).equals("math.h");
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66 bool GnuModeUnsupported = !LangOpts.GNUMode && (BuiltinInfo.Langs & GNU_LANG);
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67 bool MSModeUnsupported =
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68 !LangOpts.MicrosoftExt && (BuiltinInfo.Langs & MS_LANG);
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69 bool ObjCUnsupported = !LangOpts.ObjC && BuiltinInfo.Langs == OBJC_LANG;
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70 bool OclC1Unsupported = (LangOpts.OpenCLVersion / 100) != 1 &&
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71 (BuiltinInfo.Langs & ALL_OCLC_LANGUAGES ) == OCLC1X_LANG;
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72 bool OclC2Unsupported =
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73 (LangOpts.OpenCLVersion != 200 && !LangOpts.OpenCLCPlusPlus) &&
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74 (BuiltinInfo.Langs & ALL_OCLC_LANGUAGES) == OCLC20_LANG;
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75 bool OclCUnsupported = !LangOpts.OpenCL &&
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76 (BuiltinInfo.Langs & ALL_OCLC_LANGUAGES);
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77 bool OpenMPUnsupported = !LangOpts.OpenMP && BuiltinInfo.Langs == OMP_LANG;
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78 bool CPlusPlusUnsupported =
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79 !LangOpts.CPlusPlus && BuiltinInfo.Langs == CXX_LANG;
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80 return !BuiltinsUnsupported && !MathBuiltinsUnsupported && !OclCUnsupported &&
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81 !OclC1Unsupported && !OclC2Unsupported && !OpenMPUnsupported &&
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82 !GnuModeUnsupported && !MSModeUnsupported && !ObjCUnsupported &&
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83 !CPlusPlusUnsupported;
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84 }
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85
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86 /// initializeBuiltins - Mark the identifiers for all the builtins with their
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87 /// appropriate builtin ID # and mark any non-portable builtin identifiers as
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88 /// such.
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89 void Builtin::Context::initializeBuiltins(IdentifierTable &Table,
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90 const LangOptions& LangOpts) {
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91 // Step #1: mark all target-independent builtins with their ID's.
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92 for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i)
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93 if (builtinIsSupported(BuiltinInfo[i], LangOpts)) {
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94 Table.get(BuiltinInfo[i].Name).setBuiltinID(i);
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95 }
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96
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97 // Step #2: Register target-specific builtins.
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98 for (unsigned i = 0, e = TSRecords.size(); i != e; ++i)
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99 if (builtinIsSupported(TSRecords[i], LangOpts))
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100 Table.get(TSRecords[i].Name).setBuiltinID(i + Builtin::FirstTSBuiltin);
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101
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102 // Step #3: Register target-specific builtins for AuxTarget.
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103 for (unsigned i = 0, e = AuxTSRecords.size(); i != e; ++i)
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104 Table.get(AuxTSRecords[i].Name)
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105 .setBuiltinID(i + Builtin::FirstTSBuiltin + TSRecords.size());
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106 }
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107
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108 void Builtin::Context::forgetBuiltin(unsigned ID, IdentifierTable &Table) {
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109 Table.get(getRecord(ID).Name).setBuiltinID(0);
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110 }
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111
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112 unsigned Builtin::Context::getRequiredVectorWidth(unsigned ID) const {
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113 const char *WidthPos = ::strchr(getRecord(ID).Attributes, 'V');
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114 if (!WidthPos)
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115 return 0;
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116
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117 ++WidthPos;
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118 assert(*WidthPos == ':' &&
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119 "Vector width specifier must be followed by a ':'");
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120 ++WidthPos;
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121
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122 char *EndPos;
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123 unsigned Width = ::strtol(WidthPos, &EndPos, 10);
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124 assert(*EndPos == ':' && "Vector width specific must end with a ':'");
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125 return Width;
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126 }
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127
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128 bool Builtin::Context::isLike(unsigned ID, unsigned &FormatIdx,
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129 bool &HasVAListArg, const char *Fmt) const {
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130 assert(Fmt && "Not passed a format string");
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131 assert(::strlen(Fmt) == 2 &&
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132 "Format string needs to be two characters long");
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133 assert(::toupper(Fmt[0]) == Fmt[1] &&
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134 "Format string is not in the form \"xX\"");
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135
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136 const char *Like = ::strpbrk(getRecord(ID).Attributes, Fmt);
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137 if (!Like)
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138 return false;
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139
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140 HasVAListArg = (*Like == Fmt[1]);
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141
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142 ++Like;
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143 assert(*Like == ':' && "Format specifier must be followed by a ':'");
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144 ++Like;
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145
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146 assert(::strchr(Like, ':') && "Format specifier must end with a ':'");
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147 FormatIdx = ::strtol(Like, nullptr, 10);
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148 return true;
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149 }
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150
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151 bool Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx,
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152 bool &HasVAListArg) {
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153 return isLike(ID, FormatIdx, HasVAListArg, "pP");
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154 }
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155
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156 bool Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx,
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157 bool &HasVAListArg) {
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158 return isLike(ID, FormatIdx, HasVAListArg, "sS");
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159 }
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160
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161 bool Builtin::Context::performsCallback(unsigned ID,
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162 SmallVectorImpl<int> &Encoding) const {
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163 const char *CalleePos = ::strchr(getRecord(ID).Attributes, 'C');
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164 if (!CalleePos)
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165 return false;
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166
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167 ++CalleePos;
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168 assert(*CalleePos == '<' &&
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169 "Callback callee specifier must be followed by a '<'");
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170 ++CalleePos;
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171
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172 char *EndPos;
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173 int CalleeIdx = ::strtol(CalleePos, &EndPos, 10);
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174 assert(CalleeIdx >= 0 && "Callee index is supposed to be positive!");
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175 Encoding.push_back(CalleeIdx);
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176
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177 while (*EndPos == ',') {
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178 const char *PayloadPos = EndPos + 1;
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179
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180 int PayloadIdx = ::strtol(PayloadPos, &EndPos, 10);
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181 Encoding.push_back(PayloadIdx);
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182 }
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183
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184 assert(*EndPos == '>' && "Callback callee specifier must end with a '>'");
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185 return true;
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186 }
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187
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188 bool Builtin::Context::canBeRedeclared(unsigned ID) const {
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189 return ID == Builtin::NotBuiltin ||
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190 ID == Builtin::BI__va_start ||
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191 (!hasReferenceArgsOrResult(ID) &&
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192 !hasCustomTypechecking(ID));
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193 }
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