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/StringRef.h" 19using namespace clang; 20 21static const Builtin::Info BuiltinInfo[] = { 22 { "not a builtin function", nullptr, nullptr, nullptr, ALL_LANGUAGES,nullptr}, 23#define BUILTIN(ID, TYPE, ATTRS) \ 24 { #ID, TYPE, ATTRS, nullptr, ALL_LANGUAGES, nullptr }, 25#define LANGBUILTIN(ID, TYPE, ATTRS, LANGS) \ 26 { #ID, TYPE, ATTRS, nullptr, LANGS, nullptr }, 27#define LIBBUILTIN(ID, TYPE, ATTRS, HEADER, LANGS) \ 28 { #ID, TYPE, ATTRS, HEADER, LANGS, nullptr }, 29#include "clang/Basic/Builtins.def" 30}; 31 32const Builtin::Info &Builtin::Context::getRecord(unsigned ID) const { 33 if (ID < Builtin::FirstTSBuiltin) 34 return BuiltinInfo[ID]; 35 assert(((ID - Builtin::FirstTSBuiltin) < 36 (TSRecords.size() + AuxTSRecords.size())) && 37 "Invalid builtin ID!"); 38 if (isAuxBuiltinID(ID)) 39 return AuxTSRecords[getAuxBuiltinID(ID) - Builtin::FirstTSBuiltin]; 40 return TSRecords[ID - Builtin::FirstTSBuiltin]; 41} 42 43void Builtin::Context::InitializeTarget(const TargetInfo &Target, 44 const TargetInfo *AuxTarget) { 45 assert(TSRecords.empty() && "Already initialized target?"); 46 TSRecords = Target.getTargetBuiltins(); 47 if (AuxTarget) 48 AuxTSRecords = AuxTarget->getTargetBuiltins(); 49} 50 51bool Builtin::Context::isBuiltinFunc(const char *Name) { 52 StringRef FuncName(Name); 53 for (unsigned i = Builtin::NotBuiltin + 1; i != Builtin::FirstTSBuiltin; ++i) 54 if (FuncName.equals(BuiltinInfo[i].Name)) 55 return strchr(BuiltinInfo[i].Attributes, 'f') != nullptr; 56 57 return false; 58} 59 60bool Builtin::Context::builtinIsSupported(const Builtin::Info &BuiltinInfo, 61 const LangOptions &LangOpts) { 62 bool BuiltinsUnsupported = 63 (LangOpts.NoBuiltin || LangOpts.isNoBuiltinFunc(BuiltinInfo.Name)) && 64 strchr(BuiltinInfo.Attributes, 'f'); 65 bool MathBuiltinsUnsupported = 66 LangOpts.NoMathBuiltin && BuiltinInfo.HeaderName && 67 llvm::StringRef(BuiltinInfo.HeaderName).equals("math.h"); 68 bool GnuModeUnsupported = !LangOpts.GNUMode && (BuiltinInfo.Langs & GNU_LANG); 69 bool MSModeUnsupported = 70 !LangOpts.MicrosoftExt && (BuiltinInfo.Langs & MS_LANG); 71 bool ObjCUnsupported = !LangOpts.ObjC1 && BuiltinInfo.Langs == OBJC_LANG; 72 bool OclCUnsupported = LangOpts.OpenCLVersion != 200 && 73 BuiltinInfo.Langs == OCLC20_LANG; 74 return !BuiltinsUnsupported && !MathBuiltinsUnsupported && !OclCUnsupported && 75 !GnuModeUnsupported && !MSModeUnsupported && !ObjCUnsupported; 76} 77 78/// initializeBuiltins - Mark the identifiers for all the builtins with their 79/// appropriate builtin ID # and mark any non-portable builtin identifiers as 80/// such. 81void Builtin::Context::initializeBuiltins(IdentifierTable &Table, 82 const LangOptions& LangOpts) { 83 // Step #1: mark all target-independent builtins with their ID's. 84 for (unsigned i = Builtin::NotBuiltin+1; i != Builtin::FirstTSBuiltin; ++i) 85 if (builtinIsSupported(BuiltinInfo[i], LangOpts)) { 86 Table.get(BuiltinInfo[i].Name).setBuiltinID(i); 87 } 88 89 // Step #2: Register target-specific builtins. 90 for (unsigned i = 0, e = TSRecords.size(); i != e; ++i) 91 if (builtinIsSupported(TSRecords[i], LangOpts)) 92 Table.get(TSRecords[i].Name).setBuiltinID(i + Builtin::FirstTSBuiltin); 93 94 // Step #3: Register target-specific builtins for AuxTarget. 95 for (unsigned i = 0, e = AuxTSRecords.size(); i != e; ++i) 96 Table.get(AuxTSRecords[i].Name) 97 .setBuiltinID(i + Builtin::FirstTSBuiltin + TSRecords.size()); 98} 99 100void Builtin::Context::forgetBuiltin(unsigned ID, IdentifierTable &Table) { 101 Table.get(getRecord(ID).Name).setBuiltinID(0); 102} 103 104bool Builtin::Context::isLike(unsigned ID, unsigned &FormatIdx, 105 bool &HasVAListArg, const char *Fmt) const { 106 assert(Fmt && "Not passed a format string"); 107 assert(::strlen(Fmt) == 2 && 108 "Format string needs to be two characters long"); 109 assert(::toupper(Fmt[0]) == Fmt[1] && 110 "Format string is not in the form \"xX\""); 111 112 const char *Like = ::strpbrk(getRecord(ID).Attributes, Fmt); 113 if (!Like) 114 return false; 115 116 HasVAListArg = (*Like == Fmt[1]); 117 118 ++Like; 119 assert(*Like == ':' && "Format specifier must be followed by a ':'"); 120 ++Like; 121 122 assert(::strchr(Like, ':') && "Format specifier must end with a ':'"); 123 FormatIdx = ::strtol(Like, nullptr, 10); 124 return true; 125} 126 127bool Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx, 128 bool &HasVAListArg) { 129 return isLike(ID, FormatIdx, HasVAListArg, "pP"); 130} 131 132bool Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx, 133 bool &HasVAListArg) { 134 return isLike(ID, FormatIdx, HasVAListArg, "sS"); 135} 136