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//===--- Sema.cpp - AST Builder and Semantic Analysis Implementation ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the actions class which performs semantic analysis and
// builds an AST out of a parse stream.
//
//===----------------------------------------------------------------------===//
#include "Sema.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/Expr.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Basic/Diagnostic.h"
using namespace clang;
static inline RecordDecl *CreateStructDecl(ASTContext &C, const char *Name) {
if (C.getLangOptions().CPlusPlus)
return CXXRecordDecl::Create(C, TagDecl::TK_struct,
C.getTranslationUnitDecl(),
SourceLocation(), &C.Idents.get(Name));
return RecordDecl::Create(C, TagDecl::TK_struct,
C.getTranslationUnitDecl(),
SourceLocation(), &C.Idents.get(Name));
}
void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) {
TUScope = S;
PushDeclContext(Context.getTranslationUnitDecl());
if (!PP.getLangOptions().ObjC1) return;
// Synthesize "typedef struct objc_selector *SEL;"
RecordDecl *SelTag = CreateStructDecl(Context, "objc_selector");
PushOnScopeChains(SelTag, TUScope);
QualType SelT = Context.getPointerType(Context.getTagDeclType(SelTag));
TypedefDecl *SelTypedef = TypedefDecl::Create(Context, CurContext,
SourceLocation(),
&Context.Idents.get("SEL"),
SelT, 0);
PushOnScopeChains(SelTypedef, TUScope);
Context.setObjCSelType(SelTypedef);
// FIXME: Make sure these don't leak!
RecordDecl *ClassTag = CreateStructDecl(Context, "objc_class");
QualType ClassT = Context.getPointerType(Context.getTagDeclType(ClassTag));
TypedefDecl *ClassTypedef =
TypedefDecl::Create(Context, CurContext, SourceLocation(),
&Context.Idents.get("Class"), ClassT, 0);
PushOnScopeChains(ClassTag, TUScope);
PushOnScopeChains(ClassTypedef, TUScope);
Context.setObjCClassType(ClassTypedef);
// Synthesize "@class Protocol;
ObjCInterfaceDecl *ProtocolDecl =
ObjCInterfaceDecl::Create(Context, SourceLocation(),
&Context.Idents.get("Protocol"),
SourceLocation(), true);
Context.setObjCProtoType(Context.getObjCInterfaceType(ProtocolDecl));
PushOnScopeChains(ProtocolDecl, TUScope);
// Synthesize "typedef struct objc_object { Class isa; } *id;"
RecordDecl *ObjectTag = CreateStructDecl(Context, "objc_object");
QualType ObjT = Context.getPointerType(Context.getTagDeclType(ObjectTag));
PushOnScopeChains(ObjectTag, TUScope);
TypedefDecl *IdTypedef = TypedefDecl::Create(Context, CurContext,
SourceLocation(),
&Context.Idents.get("id"),
ObjT, 0);
PushOnScopeChains(IdTypedef, TUScope);
Context.setObjCIdType(IdTypedef);
}
Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer)
: PP(pp), Context(ctxt), Consumer(consumer), CurContext(0),PreDeclaratorDC(0),
CurBlock(0), PackContext(0), IdResolver(pp.getLangOptions()) {
// Get IdentifierInfo objects for known functions for which we
// do extra checking.
IdentifierTable &IT = PP.getIdentifierTable();
KnownFunctionIDs[id_printf] = &IT.get("printf");
KnownFunctionIDs[id_fprintf] = &IT.get("fprintf");
KnownFunctionIDs[id_sprintf] = &IT.get("sprintf");
KnownFunctionIDs[id_sprintf_chk] = &IT.get("__builtin___sprintf_chk");
KnownFunctionIDs[id_snprintf] = &IT.get("snprintf");
KnownFunctionIDs[id_snprintf_chk] = &IT.get("__builtin___snprintf_chk");
KnownFunctionIDs[id_asprintf] = &IT.get("asprintf");
KnownFunctionIDs[id_NSLog] = &IT.get("NSLog");
KnownFunctionIDs[id_vsnprintf] = &IT.get("vsnprintf");
KnownFunctionIDs[id_vasprintf] = &IT.get("vasprintf");
KnownFunctionIDs[id_vfprintf] = &IT.get("vfprintf");
KnownFunctionIDs[id_vsprintf] = &IT.get("vsprintf");
KnownFunctionIDs[id_vsprintf_chk] = &IT.get("__builtin___vsprintf_chk");
KnownFunctionIDs[id_vsnprintf] = &IT.get("vsnprintf");
KnownFunctionIDs[id_vsnprintf_chk] = &IT.get("__builtin___vsnprintf_chk");
KnownFunctionIDs[id_vprintf] = &IT.get("vprintf");
SuperID = &IT.get("super");
// ObjC builtin typedef names.
Ident_id = &IT.get("id");
Ident_Class = &IT.get("Class");
Ident_SEL = &IT.get("SEL");
Ident_Protocol = &IT.get("Protocol");
Ident_StdNs = &IT.get("std");
Ident_TypeInfo = 0;
StdNamespace = 0;
TUScope = 0;
if (getLangOptions().CPlusPlus)
FieldCollector.reset(new CXXFieldCollector());
}
/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
/// If there is already an implicit cast, merge into the existing one.
/// If isLvalue, the result of the cast is an lvalue.
void Sema::ImpCastExprToType(Expr *&Expr, QualType Ty, bool isLvalue) {
QualType ExprTy = Context.getCanonicalType(Expr->getType());
QualType TypeTy = Context.getCanonicalType(Ty);
if (ExprTy == TypeTy)
return;
if (Expr->getType().getTypePtr()->isPointerType() &&
Ty.getTypePtr()->isPointerType()) {
QualType ExprBaseType =
cast<PointerType>(ExprTy.getUnqualifiedType())->getPointeeType();
QualType BaseType =
cast<PointerType>(TypeTy.getUnqualifiedType())->getPointeeType();
if (ExprBaseType.getAddressSpace() != BaseType.getAddressSpace()) {
Diag(Expr->getExprLoc(), diag::err_implicit_pointer_address_space_cast)
<< Expr->getSourceRange();
}
}
if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(Expr)) {
ImpCast->setType(Ty);
ImpCast->setLvalueCast(isLvalue);
} else
Expr = new ImplicitCastExpr(Ty, Expr, isLvalue);
}
void Sema::DeleteExpr(ExprTy *E) {
delete static_cast<Expr*>(E);
}
void Sema::DeleteStmt(StmtTy *S) {
delete static_cast<Stmt*>(S);
}
/// ActOnEndOfTranslationUnit - This is called at the very end of the
/// translation unit when EOF is reached and all but the top-level scope is
/// popped.
void Sema::ActOnEndOfTranslationUnit() {
}
//===----------------------------------------------------------------------===//
// Helper functions.
//===----------------------------------------------------------------------===//
DiagnosticInfo Sema::Diag(SourceLocation Loc, unsigned DiagID) {
return PP.getDiagnostics().Report(FullSourceLoc(Loc, PP.getSourceManager()),
DiagID);
}
bool Sema::Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg) {
PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID) << Msg;
return true;
}
bool Sema::Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg1,
const std::string &Msg2) {
PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID) << Msg1 << Msg2;
return true;
}
bool Sema::Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg,
const SourceRange& Range) {
PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID) << Msg << Range;
return true;
}
const LangOptions &Sema::getLangOptions() const {
return PP.getLangOptions();
}
ObjCMethodDecl *Sema::getCurMethodDecl() {
DeclContext *DC = CurContext;
while (isa<BlockDecl>(DC))
DC = DC->getParent();
return dyn_cast<ObjCMethodDecl>(DC);
}
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