Sema.cpp revision b752f289026ad8e5f44851b20e009a27ed61eefc 
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
29/// isObjCObjectPointerType - Returns true if type is an Objective-C pointer
30/// to an object type.  This includes "id" and "Class" (two 'special' pointers
31/// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified
32/// ID type).
33bool Sema::isObjCObjectPointerType(QualType Ty) const {
34  if (Ty->isObjCQualifiedIdType())
35    return true;
36
37  if (!Ty->isPointerType())
38    return false;
39
40  // Check to see if this is 'id' or 'Class', both of which are typedefs for
41  // pointer types.  This looks for the typedef specifically, not for the
42  // underlying type.
43  if (Ty == Context.getObjCIdType() || Ty == Context.getObjCClassType())
44    return true;
45
46  // If this a pointer to an interface (e.g. NSString*), it is ok.
47  return Ty->getAsPointerType()->getPointeeType()->isObjCInterfaceType();
48}
49
50void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) {
51  TUScope = S;
52  CurContext = Context.getTranslationUnitDecl();
53  if (!PP.getLangOptions().ObjC1) return;
54
55  // Synthesize "typedef struct objc_selector *SEL;"
56  RecordDecl *SelTag = RecordDecl::Create(Context, TagDecl::TK_struct,
57                                          CurContext,
58                                          SourceLocation(),
59                                          &Context.Idents.get("objc_selector"),
60                                          0);
61  PushOnScopeChains(SelTag, TUScope);
62
63  QualType SelT = Context.getPointerType(Context.getTagDeclType(SelTag));
64  TypedefDecl *SelTypedef = TypedefDecl::Create(Context, CurContext,
65                                                SourceLocation(),
66                                                &Context.Idents.get("SEL"),
67                                                SelT, 0);
68  PushOnScopeChains(SelTypedef, TUScope);
69  Context.setObjCSelType(SelTypedef);
70
71  // FIXME: Make sure these don't leak!
72  RecordDecl *ClassTag = RecordDecl::Create(Context, TagDecl::TK_struct,
73                                            CurContext,
74                                            SourceLocation(),
75                                            &Context.Idents.get("objc_class"),
76                                            0);
77  QualType ClassT = Context.getPointerType(Context.getTagDeclType(ClassTag));
78  TypedefDecl *ClassTypedef =
79    TypedefDecl::Create(Context, CurContext, SourceLocation(),
80                        &Context.Idents.get("Class"), ClassT, 0);
81  PushOnScopeChains(ClassTag, TUScope);
82  PushOnScopeChains(ClassTypedef, TUScope);
83  Context.setObjCClassType(ClassTypedef);
84  // Synthesize "@class Protocol;
85  ObjCInterfaceDecl *ProtocolDecl =
86    ObjCInterfaceDecl::Create(Context, SourceLocation(),
87                              &Context.Idents.get("Protocol"),
88                              SourceLocation(), true);
89  Context.setObjCProtoType(Context.getObjCInterfaceType(ProtocolDecl));
90  PushOnScopeChains(ProtocolDecl, TUScope);
91
92  // Synthesize "typedef struct objc_object { Class isa; } *id;"
93  RecordDecl *ObjectTag =
94    RecordDecl::Create(Context, TagDecl::TK_struct, CurContext,
95                       SourceLocation(),
96                       &Context.Idents.get("objc_object"), 0);
97  QualType ObjT = Context.getPointerType(Context.getTagDeclType(ObjectTag));
98  PushOnScopeChains(ObjectTag, TUScope);
99  TypedefDecl *IdTypedef = TypedefDecl::Create(Context, CurContext,
100                                               SourceLocation(),
101                                               &Context.Idents.get("id"),
102                                               ObjT, 0);
103  PushOnScopeChains(IdTypedef, TUScope);
104  Context.setObjCIdType(IdTypedef);
105}
106
107Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer)
108  : PP(pp), Context(ctxt), Consumer(consumer), CurContext(0) {
109
110  // Get IdentifierInfo objects for known functions for which we
111  // do extra checking.
112  IdentifierTable &IT = PP.getIdentifierTable();
113
114  KnownFunctionIDs[id_printf]    = &IT.get("printf");
115  KnownFunctionIDs[id_fprintf]   = &IT.get("fprintf");
116  KnownFunctionIDs[id_sprintf]   = &IT.get("sprintf");
117  KnownFunctionIDs[id_snprintf]  = &IT.get("snprintf");
118  KnownFunctionIDs[id_asprintf]  = &IT.get("asprintf");
119  KnownFunctionIDs[id_NSLog]     = &IT.get("NSLog");
120  KnownFunctionIDs[id_vsnprintf] = &IT.get("vsnprintf");
121  KnownFunctionIDs[id_vasprintf] = &IT.get("vasprintf");
122  KnownFunctionIDs[id_vfprintf]  = &IT.get("vfprintf");
123  KnownFunctionIDs[id_vsprintf]  = &IT.get("vsprintf");
124  KnownFunctionIDs[id_vprintf]   = &IT.get("vprintf");
125
126  TUScope = 0;
127  if (getLangOptions().CPlusPlus)
128    FieldCollector.reset(new CXXFieldCollector());
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