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;
33 GNU_LANG = 0x1, // builtin requires GNU mode.
34 C_LANG = 0x2, // builtin for c only.
35 CXX_LANG = 0x4, // builtin for cplusplus only.
36 OBJC_LANG = 0x8, // builtin for objective-c and objective-c++
37 MS_LANG = 0x10, // builtin requires MS mode.
38 OCLC20_LANG = 0x20, // builtin for OpenCL C 2.0 only.
39 OCLC1X_LANG = 0x40, // builtin for OpenCL C 1.x only.
40 OMP_LANG = 0x80, // builtin requires OpenMP.
41 ALL_LANGUAGES = C_LANG | CXX_LANG | OBJC_LANG, // builtin for all languages.
42 ALL_GNU_LANGUAGES = ALL_LANGUAGES | GNU_LANG, // builtin requires GNU mode.
43 ALL_MS_LANGUAGES = ALL_LANGUAGES | MS_LANG, // builtin requires MS mode.
44 ALL_OCLC_LANGUAGES = OCLC1X_LANG | OCLC20_LANG // builtin for OCLC languages.
49 NotBuiltin = 0, // This is not a builtin function.
50 #define BUILTIN(ID, TYPE, ATTRS) BI##ID,
51 #include "clang/Basic/Builtins.def"
56 const char *Name, *Type, *Attributes, *HeaderName;
61 /// Holds information about both target-independent and
62 /// target-specific builtins, allowing easy queries by clients.
64 /// Builtins from an optional auxiliary target are stored in
65 /// AuxTSRecords. Their IDs are shifted up by TSRecords.size() and need to
66 /// be translated back with getAuxBuiltinID() before use.
68 llvm::ArrayRef<Info> TSRecords;
69 llvm::ArrayRef<Info> AuxTSRecords;
74 /// Perform target-specific initialization
75 /// \param AuxTarget Target info to incorporate builtins from. May be nullptr.
76 void InitializeTarget(const TargetInfo &Target, const TargetInfo *AuxTarget);
78 /// Mark the identifiers for all the builtins with their
79 /// appropriate builtin ID # and mark any non-portable builtin identifiers as
81 void initializeBuiltins(IdentifierTable &Table, const LangOptions& LangOpts);
83 /// Return the identifier name for the specified builtin,
84 /// e.g. "__builtin_abs".
85 const char *getName(unsigned ID) const {
86 return getRecord(ID).Name;
89 /// Get the type descriptor string for the specified builtin.
90 const char *getTypeString(unsigned ID) const {
91 return getRecord(ID).Type;
94 /// Return true if this function is a target-specific builtin.
95 bool isTSBuiltin(unsigned ID) const {
96 return ID >= Builtin::FirstTSBuiltin;
99 /// Return true if this function has no side effects.
100 bool isPure(unsigned ID) const {
101 return strchr(getRecord(ID).Attributes, 'U') != nullptr;
104 /// Return true if this function has no side effects and doesn't
106 bool isConst(unsigned ID) const {
107 return strchr(getRecord(ID).Attributes, 'c') != nullptr;
110 /// Return true if we know this builtin never throws an exception.
111 bool isNoThrow(unsigned ID) const {
112 return strchr(getRecord(ID).Attributes, 'n') != nullptr;
115 /// Return true if we know this builtin never returns.
116 bool isNoReturn(unsigned ID) const {
117 return strchr(getRecord(ID).Attributes, 'r') != nullptr;
120 /// Return true if we know this builtin can return twice.
121 bool isReturnsTwice(unsigned ID) const {
122 return strchr(getRecord(ID).Attributes, 'j') != nullptr;
125 /// Returns true if this builtin does not perform the side-effects
126 /// of its arguments.
127 bool isUnevaluated(unsigned ID) const {
128 return strchr(getRecord(ID).Attributes, 'u') != nullptr;
131 /// Return true if this is a builtin for a libc/libm function,
132 /// with a "__builtin_" prefix (e.g. __builtin_abs).
133 bool isLibFunction(unsigned ID) const {
134 return strchr(getRecord(ID).Attributes, 'F') != nullptr;
137 /// Determines whether this builtin is a predefined libc/libm
138 /// function, such as "malloc", where we know the signature a
140 bool isPredefinedLibFunction(unsigned ID) const {
141 return strchr(getRecord(ID).Attributes, 'f') != nullptr;
144 /// Returns true if this builtin requires appropriate header in other
145 /// compilers. In Clang it will work even without including it, but we can emit
146 /// a warning about missing header.
147 bool isHeaderDependentFunction(unsigned ID) const {
148 return strchr(getRecord(ID).Attributes, 'h') != nullptr;
151 /// Determines whether this builtin is a predefined compiler-rt/libgcc
152 /// function, such as "__clear_cache", where we know the signature a
154 bool isPredefinedRuntimeFunction(unsigned ID) const {
155 return strchr(getRecord(ID).Attributes, 'i') != nullptr;
158 /// Determines whether this builtin has custom typechecking.
159 bool hasCustomTypechecking(unsigned ID) const {
160 return strchr(getRecord(ID).Attributes, 't') != nullptr;
163 /// Determines whether this builtin has a result or any arguments which
164 /// are pointer types.
165 bool hasPtrArgsOrResult(unsigned ID) const {
166 return strchr(getRecord(ID).Type, '*') != nullptr;
169 /// Return true if this builtin has a result or any arguments which are
171 bool hasReferenceArgsOrResult(unsigned ID) const {
172 return strchr(getRecord(ID).Type, '&') != nullptr ||
173 strchr(getRecord(ID).Type, 'A') != nullptr;
176 /// Completely forget that the given ID was ever considered a builtin,
177 /// e.g., because the user provided a conflicting signature.
178 void forgetBuiltin(unsigned ID, IdentifierTable &Table);
180 /// If this is a library function that comes from a specific
181 /// header, retrieve that header name.
182 const char *getHeaderName(unsigned ID) const {
183 return getRecord(ID).HeaderName;
186 /// Determine whether this builtin is like printf in its
187 /// formatting rules and, if so, set the index to the format string
188 /// argument and whether this function as a va_list argument.
189 bool isPrintfLike(unsigned ID, unsigned &FormatIdx, bool &HasVAListArg);
191 /// Determine whether this builtin is like scanf in its
192 /// formatting rules and, if so, set the index to the format string
193 /// argument and whether this function as a va_list argument.
194 bool isScanfLike(unsigned ID, unsigned &FormatIdx, bool &HasVAListArg);
196 /// Determine whether this builtin has callback behavior (see
197 /// llvm::AbstractCallSites for details). If so, add the index to the
198 /// callback callee argument and the callback payload arguments.
199 bool performsCallback(unsigned ID,
200 llvm::SmallVectorImpl<int> &Encoding) const;
202 /// Return true if this function has no side effects and doesn't
203 /// read memory, except for possibly errno.
205 /// Such functions can be const when the MathErrno lang option is disabled.
206 bool isConstWithoutErrno(unsigned ID) const {
207 return strchr(getRecord(ID).Attributes, 'e') != nullptr;
210 const char *getRequiredFeatures(unsigned ID) const {
211 return getRecord(ID).Features;
214 unsigned getRequiredVectorWidth(unsigned ID) const;
216 /// Return true if builtin ID belongs to AuxTarget.
217 bool isAuxBuiltinID(unsigned ID) const {
218 return ID >= (Builtin::FirstTSBuiltin + TSRecords.size());
221 /// Return real builtin ID (i.e. ID it would have during compilation
223 unsigned getAuxBuiltinID(unsigned ID) const { return ID - TSRecords.size(); }
225 /// Returns true if this is a libc/libm function without the '__builtin_'
227 static bool isBuiltinFunc(const char *Name);
229 /// Returns true if this is a builtin that can be redeclared. Returns true
230 /// for non-builtins.
231 bool canBeRedeclared(unsigned ID) const;
234 const Info &getRecord(unsigned ID) const;
236 /// Is this builtin supported according to the given language options?
237 bool builtinIsSupported(const Builtin::Info &BuiltinInfo,
238 const LangOptions &LangOpts);
240 /// Helper function for isPrintfLike and isScanfLike.
241 bool isLike(unsigned ID, unsigned &FormatIdx, bool &HasVAListArg,
242 const char *Fmt) const;
247 /// Kinds of BuiltinTemplateDecl.
248 enum BuiltinTemplateKind : int {
249 /// This names the __make_integer_seq BuiltinTemplateDecl.
250 BTK__make_integer_seq,
252 /// This names the __type_pack_element BuiltinTemplateDecl.
253 BTK__type_pack_element
256 } // end namespace clang