1 //===--- Builtins.h - Builtin function header -------------------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
10 /// Defines enum values for all the target-independent builtin
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_CLANG_BASIC_BUILTINS_H
16 #define LLVM_CLANG_BASIC_BUILTINS_H
18 #include "llvm/ADT/ArrayRef.h"
21 // VC++ defines 'alloca' as an object-like macro, which interferes with our
27 class IdentifierTable;
31 GNU_LANG = 0x1, // builtin requires GNU mode.
32 C_LANG = 0x2, // builtin for c only.
33 CXX_LANG = 0x4, // builtin for cplusplus only.
34 OBJC_LANG = 0x8, // builtin for objective-c and objective-c++
35 MS_LANG = 0x10, // builtin requires MS mode.
36 OCLC20_LANG = 0x20, // builtin for OpenCL C 2.0 only.
37 OCLC1X_LANG = 0x40, // builtin for OpenCL C 1.x only.
38 OMP_LANG = 0x80, // builtin requires OpenMP.
39 ALL_LANGUAGES = C_LANG | CXX_LANG | OBJC_LANG, // builtin for all languages.
40 ALL_GNU_LANGUAGES = ALL_LANGUAGES | GNU_LANG, // builtin requires GNU mode.
41 ALL_MS_LANGUAGES = ALL_LANGUAGES | MS_LANG, // builtin requires MS mode.
42 ALL_OCLC_LANGUAGES = OCLC1X_LANG | OCLC20_LANG // builtin for OCLC languages.
47 NotBuiltin = 0, // This is not a builtin function.
48 #define BUILTIN(ID, TYPE, ATTRS) BI##ID,
49 #include "clang/Basic/Builtins.def"
54 const char *Name, *Type, *Attributes, *HeaderName;
59 /// Holds information about both target-independent and
60 /// target-specific builtins, allowing easy queries by clients.
62 /// Builtins from an optional auxiliary target are stored in
63 /// AuxTSRecords. Their IDs are shifted up by TSRecords.size() and need to
64 /// be translated back with getAuxBuiltinID() before use.
66 llvm::ArrayRef<Info> TSRecords;
67 llvm::ArrayRef<Info> AuxTSRecords;
72 /// Perform target-specific initialization
73 /// \param AuxTarget Target info to incorporate builtins from. May be nullptr.
74 void InitializeTarget(const TargetInfo &Target, const TargetInfo *AuxTarget);
76 /// Mark the identifiers for all the builtins with their
77 /// appropriate builtin ID # and mark any non-portable builtin identifiers as
79 void initializeBuiltins(IdentifierTable &Table, const LangOptions& LangOpts);
81 /// Return the identifier name for the specified builtin,
82 /// e.g. "__builtin_abs".
83 const char *getName(unsigned ID) const {
84 return getRecord(ID).Name;
87 /// Get the type descriptor string for the specified builtin.
88 const char *getTypeString(unsigned ID) const {
89 return getRecord(ID).Type;
92 /// Return true if this function is a target-specific builtin.
93 bool isTSBuiltin(unsigned ID) const {
94 return ID >= Builtin::FirstTSBuiltin;
97 /// Return true if this function has no side effects.
98 bool isPure(unsigned ID) const {
99 return strchr(getRecord(ID).Attributes, 'U') != nullptr;
102 /// Return true if this function has no side effects and doesn't
104 bool isConst(unsigned ID) const {
105 return strchr(getRecord(ID).Attributes, 'c') != nullptr;
108 /// Return true if we know this builtin never throws an exception.
109 bool isNoThrow(unsigned ID) const {
110 return strchr(getRecord(ID).Attributes, 'n') != nullptr;
113 /// Return true if we know this builtin never returns.
114 bool isNoReturn(unsigned ID) const {
115 return strchr(getRecord(ID).Attributes, 'r') != nullptr;
118 /// Return true if we know this builtin can return twice.
119 bool isReturnsTwice(unsigned ID) const {
120 return strchr(getRecord(ID).Attributes, 'j') != nullptr;
123 /// Returns true if this builtin does not perform the side-effects
124 /// of its arguments.
125 bool isUnevaluated(unsigned ID) const {
126 return strchr(getRecord(ID).Attributes, 'u') != nullptr;
129 /// Return true if this is a builtin for a libc/libm function,
130 /// with a "__builtin_" prefix (e.g. __builtin_abs).
131 bool isLibFunction(unsigned ID) const {
132 return strchr(getRecord(ID).Attributes, 'F') != nullptr;
135 /// Determines whether this builtin is a predefined libc/libm
136 /// function, such as "malloc", where we know the signature a
138 bool isPredefinedLibFunction(unsigned ID) const {
139 return strchr(getRecord(ID).Attributes, 'f') != nullptr;
142 /// Returns true if this builtin requires appropriate header in other
143 /// compilers. In Clang it will work even without including it, but we can emit
144 /// a warning about missing header.
145 bool isHeaderDependentFunction(unsigned ID) const {
146 return strchr(getRecord(ID).Attributes, 'h') != nullptr;
149 /// Determines whether this builtin is a predefined compiler-rt/libgcc
150 /// function, such as "__clear_cache", where we know the signature a
152 bool isPredefinedRuntimeFunction(unsigned ID) const {
153 return strchr(getRecord(ID).Attributes, 'i') != nullptr;
156 /// Determines whether this builtin has custom typechecking.
157 bool hasCustomTypechecking(unsigned ID) const {
158 return strchr(getRecord(ID).Attributes, 't') != nullptr;
161 /// Determines whether this builtin has a result or any arguments which
162 /// are pointer types.
163 bool hasPtrArgsOrResult(unsigned ID) const {
164 return strchr(getRecord(ID).Type, '*') != nullptr;
167 /// Return true if this builtin has a result or any arguments which are
169 bool hasReferenceArgsOrResult(unsigned ID) const {
170 return strchr(getRecord(ID).Type, '&') != nullptr ||
171 strchr(getRecord(ID).Type, 'A') != nullptr;
174 /// Completely forget that the given ID was ever considered a builtin,
175 /// e.g., because the user provided a conflicting signature.
176 void forgetBuiltin(unsigned ID, IdentifierTable &Table);
178 /// If this is a library function that comes from a specific
179 /// header, retrieve that header name.
180 const char *getHeaderName(unsigned ID) const {
181 return getRecord(ID).HeaderName;
184 /// Determine whether this builtin is like printf in its
185 /// formatting rules and, if so, set the index to the format string
186 /// argument and whether this function as a va_list argument.
187 bool isPrintfLike(unsigned ID, unsigned &FormatIdx, bool &HasVAListArg);
189 /// Determine whether this builtin is like scanf in its
190 /// formatting rules and, if so, set the index to the format string
191 /// argument and whether this function as a va_list argument.
192 bool isScanfLike(unsigned ID, unsigned &FormatIdx, bool &HasVAListArg);
194 /// Determine whether this builtin has callback behavior (see
195 /// llvm::AbstractCallSites for details). If so, add the index to the
196 /// callback callee argument and the callback payload arguments.
197 bool performsCallback(unsigned ID,
198 llvm::SmallVectorImpl<int> &Encoding) const;
200 /// Return true if this function has no side effects and doesn't
201 /// read memory, except for possibly errno.
203 /// Such functions can be const when the MathErrno lang option is disabled.
204 bool isConstWithoutErrno(unsigned ID) const {
205 return strchr(getRecord(ID).Attributes, 'e') != nullptr;
208 const char *getRequiredFeatures(unsigned ID) const {
209 return getRecord(ID).Features;
212 unsigned getRequiredVectorWidth(unsigned ID) const;
214 /// Return true if builtin ID belongs to AuxTarget.
215 bool isAuxBuiltinID(unsigned ID) const {
216 return ID >= (Builtin::FirstTSBuiltin + TSRecords.size());
219 /// Return real builtin ID (i.e. ID it would have during compilation
221 unsigned getAuxBuiltinID(unsigned ID) const { return ID - TSRecords.size(); }
223 /// Returns true if this is a libc/libm function without the '__builtin_'
225 static bool isBuiltinFunc(llvm::StringRef Name);
227 /// Returns true if this is a builtin that can be redeclared. Returns true
228 /// for non-builtins.
229 bool canBeRedeclared(unsigned ID) const;
232 const Info &getRecord(unsigned ID) const;
234 /// Is this builtin supported according to the given language options?
235 bool builtinIsSupported(const Builtin::Info &BuiltinInfo,
236 const LangOptions &LangOpts);
238 /// Helper function for isPrintfLike and isScanfLike.
239 bool isLike(unsigned ID, unsigned &FormatIdx, bool &HasVAListArg,
240 const char *Fmt) const;
245 /// Kinds of BuiltinTemplateDecl.
246 enum BuiltinTemplateKind : int {
247 /// This names the __make_integer_seq BuiltinTemplateDecl.
248 BTK__make_integer_seq,
250 /// This names the __type_pack_element BuiltinTemplateDecl.
251 BTK__type_pack_element
254 } // end namespace clang