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/Sema/SemaInternal.h"
17 #include "clang/Basic/TargetInfo.h"
18 #include "clang/AST/DeclCXX.h"
19 #include "llvm/ADT/Triple.h"
20
21 using namespace clang;
22
~TargetAttributesSema()23 TargetAttributesSema::~TargetAttributesSema() {}
ProcessDeclAttribute(Scope * scope,Decl * D,const AttributeList & Attr,Sema & S) const24 bool TargetAttributesSema::ProcessDeclAttribute(Scope *scope, Decl *D,
25 const AttributeList &Attr, Sema &S) const {
26 return false;
27 }
28
HandleMSP430InterruptAttr(Decl * d,const AttributeList & Attr,Sema & S)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:
MSP430AttributesSema()62 MSP430AttributesSema() { }
ProcessDeclAttribute(Scope * scope,Decl * D,const AttributeList & Attr,Sema & S) const63 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
HandleMBlazeInterruptHandlerAttr(Decl * d,const AttributeList & Attr,Sema & S)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
HandleMBlazeSaveVolatilesAttr(Decl * d,const AttributeList & Attr,Sema & S)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:
MBlazeAttributesSema()108 MBlazeAttributesSema() { }
ProcessDeclAttribute(Scope * scope,Decl * D,const AttributeList & Attr,Sema & S) const109 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
HandleX86ForceAlignArgPointerAttr(Decl * D,const AttributeList & Attr,Sema & S)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
HandleDLLImportAttr(Decl * D,const AttributeList & Attr,Sema & S)154 static void HandleDLLImportAttr(Decl *D, const AttributeList &Attr, Sema &S) {
155 // check the attribute arguments.
156 if (Attr.getNumArgs() != 0) {
157 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
158 return;
159 }
160
161 // Attribute can be applied only to functions or variables.
162 if (isa<VarDecl>(D)) {
163 D->addAttr(::new (S.Context) DLLImportAttr(Attr.getLoc(), S.Context));
164 return;
165 }
166
167 FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
168 if (!FD) {
169 // Apparently Visual C++ thinks it is okay to not emit a warning
170 // in this case, so only emit a warning when -fms-extensions is not
171 // specified.
172 if (!S.getLangOpts().MicrosoftExt)
173 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
174 << Attr.getName() << 2 /*variable and function*/;
175 return;
176 }
177
178 // Currently, the dllimport attribute is ignored for inlined functions.
179 // Warning is emitted.
180 if (FD->isInlineSpecified()) {
181 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllimport";
182 return;
183 }
184
185 // The attribute is also overridden by a subsequent declaration as dllexport.
186 // Warning is emitted.
187 for (AttributeList *nextAttr = Attr.getNext(); nextAttr;
188 nextAttr = nextAttr->getNext()) {
189 if (nextAttr->getKind() == AttributeList::AT_dllexport) {
190 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllimport";
191 return;
192 }
193 }
194
195 if (D->getAttr<DLLExportAttr>()) {
196 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllimport";
197 return;
198 }
199
200 D->addAttr(::new (S.Context) DLLImportAttr(Attr.getLoc(), S.Context));
201 }
202
HandleDLLExportAttr(Decl * D,const AttributeList & Attr,Sema & S)203 static void HandleDLLExportAttr(Decl *D, const AttributeList &Attr, Sema &S) {
204 // check the attribute arguments.
205 if (Attr.getNumArgs() != 0) {
206 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
207 return;
208 }
209
210 // Attribute can be applied only to functions or variables.
211 if (isa<VarDecl>(D)) {
212 D->addAttr(::new (S.Context) DLLExportAttr(Attr.getLoc(), S.Context));
213 return;
214 }
215
216 FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
217 if (!FD) {
218 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
219 << Attr.getName() << 2 /*variable and function*/;
220 return;
221 }
222
223 // Currently, the dllexport attribute is ignored for inlined functions, unless
224 // the -fkeep-inline-functions flag has been used. Warning is emitted;
225 if (FD->isInlineSpecified()) {
226 // FIXME: ... unless the -fkeep-inline-functions flag has been used.
227 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllexport";
228 return;
229 }
230
231 D->addAttr(::new (S.Context) DLLExportAttr(Attr.getLoc(), S.Context));
232 }
233
234 namespace {
235 class X86AttributesSema : public TargetAttributesSema {
236 public:
X86AttributesSema()237 X86AttributesSema() { }
ProcessDeclAttribute(Scope * scope,Decl * D,const AttributeList & Attr,Sema & S) const238 bool ProcessDeclAttribute(Scope *scope, Decl *D,
239 const AttributeList &Attr, Sema &S) const {
240 const llvm::Triple &Triple(S.Context.getTargetInfo().getTriple());
241 if (Triple.getOS() == llvm::Triple::Win32 ||
242 Triple.getOS() == llvm::Triple::MinGW32) {
243 switch (Attr.getKind()) {
244 case AttributeList::AT_dllimport: HandleDLLImportAttr(D, Attr, S);
245 return true;
246 case AttributeList::AT_dllexport: HandleDLLExportAttr(D, Attr, S);
247 return true;
248 default: break;
249 }
250 }
251 if (Triple.getArch() != llvm::Triple::x86_64 &&
252 (Attr.getName()->getName() == "force_align_arg_pointer" ||
253 Attr.getName()->getName() == "__force_align_arg_pointer__")) {
254 HandleX86ForceAlignArgPointerAttr(D, Attr, S);
255 return true;
256 }
257 return false;
258 }
259 };
260 }
261
getTargetAttributesSema() const262 const TargetAttributesSema &Sema::getTargetAttributesSema() const {
263 if (TheTargetAttributesSema)
264 return *TheTargetAttributesSema;
265
266 const llvm::Triple &Triple(Context.getTargetInfo().getTriple());
267 switch (Triple.getArch()) {
268 case llvm::Triple::msp430:
269 return *(TheTargetAttributesSema = new MSP430AttributesSema);
270 case llvm::Triple::mblaze:
271 return *(TheTargetAttributesSema = new MBlazeAttributesSema);
272 case llvm::Triple::x86:
273 case llvm::Triple::x86_64:
274 return *(TheTargetAttributesSema = new X86AttributesSema);
275 default:
276 return *(TheTargetAttributesSema = new TargetAttributesSema);
277 }
278 }
279