1 //===-- TargetAttributesSema.cpp - Encapsulate target attributes-*- C++ -*-===// 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 contains semantic analysis implementation for target-specific 11 // attributes. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "TargetAttributesSema.h" 16 #include "clang/AST/DeclCXX.h" 17 #include "clang/Basic/TargetInfo.h" 18 #include "clang/Sema/SemaInternal.h" 19 #include "llvm/ADT/Triple.h" 20 21 using namespace clang; 22 23 TargetAttributesSema::~TargetAttributesSema() {} 24 bool TargetAttributesSema::ProcessDeclAttribute(Scope *scope, Decl *D, 25 const AttributeList &Attr, Sema &S) const { 26 return false; 27 } 28 29 static void HandleMSP430InterruptAttr(Decl *d, 30 const AttributeList &Attr, Sema &S) { 31 // Check the attribute arguments. 32 if (Attr.getNumArgs() != 1) { 33 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 34 return; 35 } 36 37 // FIXME: Check for decl - it should be void ()(void). 38 39 Expr *NumParamsExpr = static_cast<Expr *>(Attr.getArg(0)); 40 llvm::APSInt NumParams(32); 41 if (!NumParamsExpr->isIntegerConstantExpr(NumParams, S.Context)) { 42 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 43 << "interrupt" << NumParamsExpr->getSourceRange(); 44 return; 45 } 46 47 unsigned Num = NumParams.getLimitedValue(255); 48 if ((Num & 1) || Num > 30) { 49 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds) 50 << "interrupt" << (int)NumParams.getSExtValue() 51 << NumParamsExpr->getSourceRange(); 52 return; 53 } 54 55 d->addAttr(::new (S.Context) MSP430InterruptAttr(Attr.getLoc(), S.Context, Num)); 56 d->addAttr(::new (S.Context) UsedAttr(Attr.getLoc(), S.Context)); 57 } 58 59 namespace { 60 class MSP430AttributesSema : public TargetAttributesSema { 61 public: 62 MSP430AttributesSema() { } 63 bool ProcessDeclAttribute(Scope *scope, Decl *D, 64 const AttributeList &Attr, Sema &S) const { 65 if (Attr.getName()->getName() == "interrupt") { 66 HandleMSP430InterruptAttr(D, Attr, S); 67 return true; 68 } 69 return false; 70 } 71 }; 72 } 73 74 static void HandleMBlazeInterruptHandlerAttr(Decl *d, const AttributeList &Attr, 75 Sema &S) { 76 // Check the attribute arguments. 77 if (Attr.getNumArgs() != 0) { 78 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 79 return; 80 } 81 82 // FIXME: Check for decl - it should be void ()(void). 83 84 d->addAttr(::new (S.Context) MBlazeInterruptHandlerAttr(Attr.getLoc(), 85 S.Context)); 86 d->addAttr(::new (S.Context) UsedAttr(Attr.getLoc(), S.Context)); 87 } 88 89 static void HandleMBlazeSaveVolatilesAttr(Decl *d, const AttributeList &Attr, 90 Sema &S) { 91 // Check the attribute arguments. 92 if (Attr.getNumArgs() != 0) { 93 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 94 return; 95 } 96 97 // FIXME: Check for decl - it should be void ()(void). 98 99 d->addAttr(::new (S.Context) MBlazeSaveVolatilesAttr(Attr.getLoc(), 100 S.Context)); 101 d->addAttr(::new (S.Context) UsedAttr(Attr.getLoc(), S.Context)); 102 } 103 104 105 namespace { 106 class MBlazeAttributesSema : public TargetAttributesSema { 107 public: 108 MBlazeAttributesSema() { } 109 bool ProcessDeclAttribute(Scope *scope, Decl *D, const AttributeList &Attr, 110 Sema &S) const { 111 if (Attr.getName()->getName() == "interrupt_handler") { 112 HandleMBlazeInterruptHandlerAttr(D, Attr, S); 113 return true; 114 } else if (Attr.getName()->getName() == "save_volatiles") { 115 HandleMBlazeSaveVolatilesAttr(D, Attr, S); 116 return true; 117 } 118 return false; 119 } 120 }; 121 } 122 123 static void HandleX86ForceAlignArgPointerAttr(Decl *D, 124 const AttributeList& Attr, 125 Sema &S) { 126 // Check the attribute arguments. 127 if (Attr.getNumArgs() != 0) { 128 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 129 return; 130 } 131 132 // If we try to apply it to a function pointer, don't warn, but don't 133 // do anything, either. It doesn't matter anyway, because there's nothing 134 // special about calling a force_align_arg_pointer function. 135 ValueDecl *VD = dyn_cast<ValueDecl>(D); 136 if (VD && VD->getType()->isFunctionPointerType()) 137 return; 138 // Also don't warn on function pointer typedefs. 139 TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D); 140 if (TD && (TD->getUnderlyingType()->isFunctionPointerType() || 141 TD->getUnderlyingType()->isFunctionType())) 142 return; 143 // Attribute can only be applied to function types. 144 if (!isa<FunctionDecl>(D)) { 145 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 146 << Attr.getName() << /* function */0; 147 return; 148 } 149 150 D->addAttr(::new (S.Context) X86ForceAlignArgPointerAttr(Attr.getRange(), 151 S.Context)); 152 } 153 154 DLLImportAttr *Sema::mergeDLLImportAttr(Decl *D, SourceRange Range, 155 unsigned AttrSpellingListIndex) { 156 if (D->hasAttr<DLLExportAttr>()) { 157 Diag(Range.getBegin(), diag::warn_attribute_ignored) << "dllimport"; 158 return NULL; 159 } 160 161 if (D->hasAttr<DLLImportAttr>()) 162 return NULL; 163 164 return ::new (Context) DLLImportAttr(Range, Context, 165 AttrSpellingListIndex); 166 } 167 168 static void HandleDLLImportAttr(Decl *D, const AttributeList &Attr, Sema &S) { 169 // check the attribute arguments. 170 if (Attr.getNumArgs() != 0) { 171 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 172 return; 173 } 174 175 // Attribute can be applied only to functions or variables. 176 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 177 if (!FD && !isa<VarDecl>(D)) { 178 // Apparently Visual C++ thinks it is okay to not emit a warning 179 // in this case, so only emit a warning when -fms-extensions is not 180 // specified. 181 if (!S.getLangOpts().MicrosoftExt) 182 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 183 << Attr.getName() << 2 /*variable and function*/; 184 return; 185 } 186 187 // Currently, the dllimport attribute is ignored for inlined functions. 188 // Warning is emitted. 189 if (FD && FD->isInlineSpecified()) { 190 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllimport"; 191 return; 192 } 193 194 unsigned Index = Attr.getAttributeSpellingListIndex(); 195 DLLImportAttr *NewAttr = S.mergeDLLImportAttr(D, Attr.getRange(), Index); 196 if (NewAttr) 197 D->addAttr(NewAttr); 198 } 199 200 DLLExportAttr *Sema::mergeDLLExportAttr(Decl *D, SourceRange Range, 201 unsigned AttrSpellingListIndex) { 202 if (DLLImportAttr *Import = D->getAttr<DLLImportAttr>()) { 203 Diag(Import->getLocation(), diag::warn_attribute_ignored) << "dllimport"; 204 D->dropAttr<DLLImportAttr>(); 205 } 206 207 if (D->hasAttr<DLLExportAttr>()) 208 return NULL; 209 210 return ::new (Context) DLLExportAttr(Range, Context, 211 AttrSpellingListIndex); 212 } 213 214 static void HandleDLLExportAttr(Decl *D, const AttributeList &Attr, Sema &S) { 215 // check the attribute arguments. 216 if (Attr.getNumArgs() != 0) { 217 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 218 return; 219 } 220 221 // Attribute can be applied only to functions or variables. 222 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 223 if (!FD && !isa<VarDecl>(D)) { 224 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 225 << Attr.getName() << 2 /*variable and function*/; 226 return; 227 } 228 229 // Currently, the dllexport attribute is ignored for inlined functions, unless 230 // the -fkeep-inline-functions flag has been used. Warning is emitted; 231 if (FD && FD->isInlineSpecified()) { 232 // FIXME: ... unless the -fkeep-inline-functions flag has been used. 233 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllexport"; 234 return; 235 } 236 237 unsigned Index = Attr.getAttributeSpellingListIndex(); 238 DLLExportAttr *NewAttr = S.mergeDLLExportAttr(D, Attr.getRange(), Index); 239 if (NewAttr) 240 D->addAttr(NewAttr); 241 } 242 243 namespace { 244 class X86AttributesSema : public TargetAttributesSema { 245 public: 246 X86AttributesSema() { } 247 bool ProcessDeclAttribute(Scope *scope, Decl *D, 248 const AttributeList &Attr, Sema &S) const { 249 const llvm::Triple &Triple(S.Context.getTargetInfo().getTriple()); 250 if (Triple.getOS() == llvm::Triple::Win32 || 251 Triple.getOS() == llvm::Triple::MinGW32) { 252 switch (Attr.getKind()) { 253 case AttributeList::AT_DLLImport: HandleDLLImportAttr(D, Attr, S); 254 return true; 255 case AttributeList::AT_DLLExport: HandleDLLExportAttr(D, Attr, S); 256 return true; 257 default: break; 258 } 259 } 260 if (Triple.getArch() != llvm::Triple::x86_64 && 261 (Attr.getName()->getName() == "force_align_arg_pointer" || 262 Attr.getName()->getName() == "__force_align_arg_pointer__")) { 263 HandleX86ForceAlignArgPointerAttr(D, Attr, S); 264 return true; 265 } 266 return false; 267 } 268 }; 269 } 270 271 static void HandleMips16Attr(Decl *D, const AttributeList &Attr, Sema &S) { 272 // check the attribute arguments. 273 if (Attr.hasParameterOrArguments()) { 274 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 275 return; 276 } 277 // Attribute can only be applied to function types. 278 if (!isa<FunctionDecl>(D)) { 279 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) 280 << Attr.getName() << /* function */0; 281 return; 282 } 283 D->addAttr(::new (S.Context) Mips16Attr(Attr.getRange(), S.Context, 284 Attr.getAttributeSpellingListIndex())); 285 } 286 287 static void HandleNoMips16Attr(Decl *D, const AttributeList &Attr, Sema &S) { 288 // check the attribute arguments. 289 if (Attr.hasParameterOrArguments()) { 290 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 291 return; 292 } 293 // Attribute can only be applied to function types. 294 if (!isa<FunctionDecl>(D)) { 295 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) 296 << Attr.getName() << /* function */0; 297 return; 298 } 299 D->addAttr(::new (S.Context) 300 NoMips16Attr(Attr.getRange(), S.Context, 301 Attr.getAttributeSpellingListIndex())); 302 } 303 304 namespace { 305 class MipsAttributesSema : public TargetAttributesSema { 306 public: 307 MipsAttributesSema() { } 308 bool ProcessDeclAttribute(Scope *scope, Decl *D, const AttributeList &Attr, 309 Sema &S) const { 310 if (Attr.getName()->getName() == "mips16") { 311 HandleMips16Attr(D, Attr, S); 312 return true; 313 } else if (Attr.getName()->getName() == "nomips16") { 314 HandleNoMips16Attr(D, Attr, S); 315 return true; 316 } 317 return false; 318 } 319 }; 320 } 321 322 const TargetAttributesSema &Sema::getTargetAttributesSema() const { 323 if (TheTargetAttributesSema) 324 return *TheTargetAttributesSema; 325 326 const llvm::Triple &Triple(Context.getTargetInfo().getTriple()); 327 switch (Triple.getArch()) { 328 case llvm::Triple::msp430: 329 return *(TheTargetAttributesSema = new MSP430AttributesSema); 330 case llvm::Triple::mblaze: 331 return *(TheTargetAttributesSema = new MBlazeAttributesSema); 332 case llvm::Triple::x86: 333 case llvm::Triple::x86_64: 334 return *(TheTargetAttributesSema = new X86AttributesSema); 335 case llvm::Triple::mips: 336 case llvm::Triple::mipsel: 337 return *(TheTargetAttributesSema = new MipsAttributesSema); 338 default: 339 return *(TheTargetAttributesSema = new TargetAttributesSema); 340 } 341 } 342
