Sema.cpp revision bda0b626e74513950405c27525af87e214e605e2 
1//===--- Sema.cpp - AST Builder and Semantic Analysis 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 the actions class which performs semantic analysis and
11// builds an AST out of a parse stream.
12//
13//===----------------------------------------------------------------------===//
14
15#include "Sema.h"
16#include "clang/AST/ASTContext.h"
17#include "clang/Lex/Preprocessor.h"
18#include "clang/Basic/Diagnostic.h"
19#include "clang/Parse/Scope.h"
20
21using namespace clang;
22
23bool Sema::isBuiltinObjCType(TypedefDecl *TD) {
24  const char *typeName = TD->getIdentifier()->getName();
25  return strcmp(typeName, "id") == 0 || strcmp(typeName, "Class") == 0 ||
26         strcmp(typeName, "SEL") == 0 || strcmp(typeName, "Protocol") == 0;
27}
28
29bool Sema::isObjCObjectPointerType(QualType type) const {
30  if (!type->isPointerType() && !type->isObjCQualifiedIdType())
31    return false;
32  if (type == Context.getObjCIdType() || type == Context.getObjCClassType() ||
33      type->isObjCQualifiedIdType())
34    return true;
35
36  if (type->isPointerType()) {
37    PointerType *pointerType = static_cast<PointerType*>(type.getTypePtr());
38    type = pointerType->getPointeeType();
39  }
40  return (type->isObjCInterfaceType() || type->isObjCQualifiedIdType());
41}
42
43void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) {
44  TUScope = S;
45  if (!PP.getLangOptions().ObjC1) return;
46
47  TypedefType *t;
48
49  // Add the built-in ObjC types.
50  t = cast<TypedefType>(Context.getObjCIdType().getTypePtr());
51  t->getDecl()->getIdentifier()->setFETokenInfo(t->getDecl());
52  TUScope->AddDecl(t->getDecl());
53  t = cast<TypedefType>(Context.getObjCClassType().getTypePtr());
54  t->getDecl()->getIdentifier()->setFETokenInfo(t->getDecl());
55  TUScope->AddDecl(t->getDecl());
56  ObjCInterfaceType *it = cast<ObjCInterfaceType>(Context.getObjCProtoType());
57  ObjCInterfaceDecl *IDecl = it->getDecl();
58  IDecl->getIdentifier()->setFETokenInfo(IDecl);
59  TUScope->AddDecl(IDecl);
60
61  // Synthesize "typedef struct objc_selector *SEL;"
62  RecordDecl *SelTag = RecordDecl::Create(Context, Decl::Struct,
63                                          SourceLocation(),
64                                          &Context.Idents.get("objc_selector"),
65                                          0);
66  SelTag->getIdentifier()->setFETokenInfo(SelTag);
67  TUScope->AddDecl(SelTag);
68
69  QualType SelT = Context.getPointerType(Context.getTagDeclType(SelTag));
70  TypedefDecl *SelTypedef = TypedefDecl::Create(Context, SourceLocation(),
71                                                &Context.Idents.get("SEL"),
72                                                SelT, 0);
73  SelTypedef->getIdentifier()->setFETokenInfo(SelTypedef);
74  TUScope->AddDecl(SelTypedef);
75  Context.setObjCSelType(SelTypedef);
76}
77
78Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer)
79  : PP(pp), Context(ctxt), Consumer(consumer),
80    CurFunctionDecl(0), CurMethodDecl(0) {
81
82  // Get IdentifierInfo objects for known functions for which we
83  // do extra checking.
84  IdentifierTable &IT = PP.getIdentifierTable();
85
86  KnownFunctionIDs[id_printf]    = &IT.get("printf");
87  KnownFunctionIDs[id_fprintf]   = &IT.get("fprintf");
88  KnownFunctionIDs[id_sprintf]   = &IT.get("sprintf");
89  KnownFunctionIDs[id_snprintf]  = &IT.get("snprintf");
90  KnownFunctionIDs[id_asprintf]  = &IT.get("asprintf");
91  KnownFunctionIDs[id_vsnprintf] = &IT.get("vsnprintf");
92  KnownFunctionIDs[id_vasprintf] = &IT.get("vasprintf");
93  KnownFunctionIDs[id_vfprintf]  = &IT.get("vfprintf");
94  KnownFunctionIDs[id_vsprintf]  = &IT.get("vsprintf");
95  KnownFunctionIDs[id_vprintf]   = &IT.get("vprintf");
96
97  // FIXME: Move this initialization up to Sema::ActOnTranslationUnitScope()
98  // and make sure the decls get inserted into TUScope!
99  if (PP.getLangOptions().ObjC1) {
100    // Synthesize "typedef struct objc_class *Class;"
101    RecordDecl *ClassTag = RecordDecl::Create(Context, Decl::Struct,
102                                              SourceLocation(),
103                                              &IT.get("objc_class"), 0);
104    QualType ClassT = Context.getPointerType(Context.getTagDeclType(ClassTag));
105    TypedefDecl *ClassTypedef =
106      TypedefDecl::Create(Context, SourceLocation(),
107                          &Context.Idents.get("Class"), ClassT, 0);
108    Context.setObjCClassType(ClassTypedef);
109
110    // Synthesize "@class Protocol;
111    ObjCInterfaceDecl *ProtocolDecl = new ObjCInterfaceDecl(SourceLocation(), 0,
112                                        &Context.Idents.get("Protocol"), true);
113    Context.setObjCProtoType(Context.getObjCInterfaceType(ProtocolDecl));
114
115    // Synthesize "typedef struct objc_object { Class isa; } *id;"
116    RecordDecl *ObjectTag =
117      RecordDecl::Create(Context, Decl::Struct, SourceLocation(),
118                         &IT.get("objc_object"), 0);
119    FieldDecl *IsaDecl = new FieldDecl(SourceLocation(), 0,
120                                       Context.getObjCClassType());
121    ObjectTag->defineBody(&IsaDecl, 1);
122    QualType ObjT = Context.getPointerType(Context.getTagDeclType(ObjectTag));
123    TypedefDecl *IdTypedef = TypedefDecl::Create(Context, SourceLocation(),
124                                                 &Context.Idents.get("id"),
125                                                 ObjT, 0);
126    Context.setObjCIdType(IdTypedef);
127  }
128  TUScope = 0;
129}
130
131/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
132/// If there is already an implicit cast, merge into the existing one.
133void Sema::ImpCastExprToType(Expr *&Expr, QualType Type) {
134  if (Expr->getType().getCanonicalType() == Type.getCanonicalType()) return;
135
136  if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(Expr))
137    ImpCast->setType(Type);
138  else
139    Expr = new ImplicitCastExpr(Type, Expr);
140}
141
142
143
144void Sema::DeleteExpr(ExprTy *E) {
145  delete static_cast<Expr*>(E);
146}
147void Sema::DeleteStmt(StmtTy *S) {
148  delete static_cast<Stmt*>(S);
149}
150
151//===----------------------------------------------------------------------===//
152// Helper functions.
153//===----------------------------------------------------------------------===//
154
155bool Sema::Diag(SourceLocation Loc, unsigned DiagID) {
156  PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID);
157  return true;
158}
159
160bool Sema::Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg) {
161  PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID,  &Msg, 1);
162  return true;
163}
164
165bool Sema::Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg1,
166                const std::string &Msg2) {
167  std::string MsgArr[] = { Msg1, Msg2 };
168  PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID,  MsgArr, 2);
169  return true;
170}
171
172bool Sema::Diag(SourceLocation Loc, unsigned DiagID, SourceRange Range) {
173  PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID, 0, 0, &Range,1);
174  return true;
175}
176
177bool Sema::Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg,
178                SourceRange Range) {
179  PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID, &Msg, 1, &Range,1);
180  return true;
181}
182
183bool Sema::Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg1,
184                const std::string &Msg2, SourceRange Range) {
185  std::string MsgArr[] = { Msg1, Msg2 };
186  PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID, MsgArr, 2, &Range, 1);
187  return true;
188}
189
190bool Sema::Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg1,
191                const std::string &Msg2, const std::string &Msg3,
192                SourceRange R1) {
193  std::string MsgArr[] = { Msg1, Msg2, Msg3 };
194  PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID, MsgArr, 3, &R1, 1);
195  return true;
196}
197
198bool Sema::Diag(SourceLocation Loc, unsigned DiagID,
199                SourceRange R1, SourceRange R2) {
200  SourceRange RangeArr[] = { R1, R2 };
201  PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID, 0, 0, RangeArr, 2);
202  return true;
203}
204
205bool Sema::Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg,
206                SourceRange R1, SourceRange R2) {
207  SourceRange RangeArr[] = { R1, R2 };
208  PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID,  &Msg, 1, RangeArr, 2);
209  return true;
210}
211
212bool Sema::Diag(SourceLocation Range, unsigned DiagID, const std::string &Msg1,
213                const std::string &Msg2, SourceRange R1, SourceRange R2) {
214  std::string MsgArr[] = { Msg1, Msg2 };
215  SourceRange RangeArr[] = { R1, R2 };
216  PP.getDiagnostics().Report(PP.getFullLoc(Range),DiagID, MsgArr,2,RangeArr, 2);
217  return true;
218}
219
220const LangOptions &Sema::getLangOptions() const {
221  return PP.getLangOptions();
222}
223