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//===--- SemaTemplateInstantiateDecl.cpp - C++ Template Decl Instantiation ===/
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//===----------------------------------------------------------------------===/
//
// This file implements C++ template instantiation for declarations.
//
//===----------------------------------------------------------------------===/
#include "Sema.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/DeclVisitor.h"
#include "clang/AST/Expr.h"
#include "llvm/Support/Compiler.h"
using namespace clang;
namespace {
class VISIBILITY_HIDDEN TemplateDeclInstantiator
: public DeclVisitor<TemplateDeclInstantiator, Decl *>
{
Sema &SemaRef;
DeclContext *Owner;
const TemplateArgument *TemplateArgs;
unsigned NumTemplateArgs;
public:
typedef Sema::OwningExprResult OwningExprResult;
TemplateDeclInstantiator(Sema &SemaRef, DeclContext *Owner,
const TemplateArgument *TemplateArgs,
unsigned NumTemplateArgs)
: SemaRef(SemaRef), Owner(Owner), TemplateArgs(TemplateArgs),
NumTemplateArgs(NumTemplateArgs) { }
// FIXME: Once we get closer to completion, replace these
// manually-written declarations with automatically-generated ones
// from clang/AST/DeclNodes.def.
Decl *VisitTypedefDecl(TypedefDecl *D);
Decl *VisitFieldDecl(FieldDecl *D);
Decl *VisitStaticAssertDecl(StaticAssertDecl *D);
Decl *VisitEnumDecl(EnumDecl *D);
// Base case. FIXME: Remove once we can instantiate everything.
Decl *VisitDecl(Decl *) {
return 0;
}
};
}
Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) {
bool Invalid = false;
QualType T = D->getUnderlyingType();
if (T->isDependentType()) {
T = SemaRef.InstantiateType(T, TemplateArgs, NumTemplateArgs,
D->getLocation(),
D->getDeclName());
if (T.isNull()) {
Invalid = true;
T = SemaRef.Context.IntTy;
}
}
// Create the new typedef
TypedefDecl *Typedef
= TypedefDecl::Create(SemaRef.Context, Owner, D->getLocation(),
D->getIdentifier(), T);
if (Invalid)
Typedef->setInvalidDecl();
Owner->addDecl(Typedef);
return Typedef;
}
Decl *TemplateDeclInstantiator::VisitFieldDecl(FieldDecl *D) {
bool Invalid = false;
QualType T = D->getType();
if (T->isDependentType()) {
T = SemaRef.InstantiateType(T, TemplateArgs, NumTemplateArgs,
D->getLocation(),
D->getDeclName());
if (!T.isNull() && T->isFunctionType()) {
// C++ [temp.arg.type]p3:
// If a declaration acquires a function type through a type
// dependent on a template-parameter and this causes a
// declaration that does not use the syntactic form of a
// function declarator to have function type, the program is
// ill-formed.
SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function)
<< T;
T = QualType();
Invalid = true;
}
}
Expr *BitWidth = D->getBitWidth();
if (Invalid)
BitWidth = 0;
else if (BitWidth) {
OwningExprResult InstantiatedBitWidth
= SemaRef.InstantiateExpr(BitWidth, TemplateArgs, NumTemplateArgs);
if (InstantiatedBitWidth.isInvalid()) {
Invalid = true;
BitWidth = 0;
} else
BitWidth = (Expr *)InstantiatedBitWidth.release();
}
FieldDecl *Field = SemaRef.CheckFieldDecl(D->getDeclName(), T,
cast<RecordDecl>(Owner),
D->getLocation(),
D->isMutable(),
BitWidth,
D->getAccess(),
0);
if (Field) {
if (Invalid)
Field->setInvalidDecl();
Owner->addDecl(Field);
}
return Field;
}
Decl *TemplateDeclInstantiator::VisitStaticAssertDecl(StaticAssertDecl *D) {
Expr *AssertExpr = D->getAssertExpr();
OwningExprResult InstantiatedAssertExpr
= SemaRef.InstantiateExpr(AssertExpr, TemplateArgs, NumTemplateArgs);
if (InstantiatedAssertExpr.isInvalid())
return 0;
OwningExprResult Message = SemaRef.Clone(D->getMessage());
Decl *StaticAssert
= (Decl *)SemaRef.ActOnStaticAssertDeclaration(D->getLocation(),
move(InstantiatedAssertExpr),
move(Message));
return StaticAssert;
}
Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) {
EnumDecl *Enum = EnumDecl::Create(SemaRef.Context, Owner,
D->getLocation(), D->getIdentifier(),
/*PrevDecl=*/0);
Owner->addDecl(Enum);
Enum->startDefinition();
llvm::SmallVector<Sema::DeclTy *, 16> Enumerators;
EnumConstantDecl *LastEnumConst = 0;
for (EnumDecl::enumerator_iterator EC = D->enumerator_begin(),
ECEnd = D->enumerator_end();
EC != ECEnd; ++EC) {
// The specified value for the enumerator.
OwningExprResult Value = SemaRef.Owned((Expr *)0);
if (Expr *UninstValue = EC->getInitExpr())
Value = SemaRef.InstantiateExpr(UninstValue,
TemplateArgs, NumTemplateArgs);
// Drop the initial value and continue.
bool isInvalid = false;
if (Value.isInvalid()) {
Value = SemaRef.Owned((Expr *)0);
isInvalid = true;
}
EnumConstantDecl *EnumConst
= SemaRef.CheckEnumConstant(Enum, LastEnumConst,
EC->getLocation(), EC->getIdentifier(),
move(Value));
if (isInvalid) {
if (EnumConst)
EnumConst->setInvalidDecl();
Enum->setInvalidDecl();
}
if (EnumConst) {
Enum->addDecl(EnumConst);
Enumerators.push_back(EnumConst);
LastEnumConst = EnumConst;
}
}
SemaRef.ActOnEnumBody(Enum->getLocation(), Enum,
&Enumerators[0], Enumerators.size());
return Enum;
}
Decl *Sema::InstantiateDecl(Decl *D, DeclContext *Owner,
const TemplateArgument *TemplateArgs,
unsigned NumTemplateArgs) {
TemplateDeclInstantiator Instantiator(*this, Owner, TemplateArgs,
NumTemplateArgs);
return Instantiator.Visit(D);
}
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