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//===------- SemaTemplate.cpp - Semantic Analysis for C++ Templates -------===/
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//+//===----------------------------------------------------------------------===/
//
// This file implements semantic analysis for C++ templates.
//+//===----------------------------------------------------------------------===/
#include "Sema.h"
#include "clang/AST/Expr.h"
#include "clang/Parse/DeclSpec.h"
#include "clang/Basic/LangOptions.h"
using namespace clang;
/// isTemplateName - Determines whether the identifier II is a
/// template name in the current scope, and returns the template
/// declaration if II names a template. An optional CXXScope can be
/// passed to indicate the C++ scope in which the identifier will be
/// found.
Sema::DeclTy *Sema::isTemplateName(IdentifierInfo &II, Scope *S,
const CXXScopeSpec *SS) {
DeclContext *DC = 0;
if (SS) {
if (SS->isInvalid())
return 0;
DC = static_cast<DeclContext*>(SS->getScopeRep());
}
Decl *IIDecl = LookupDecl(&II, Decl::IDNS_Ordinary, S, DC, false);
if (IIDecl) {
// FIXME: We need to represent templates via some kind of
// TemplateDecl, because what follows is a hack that only works in
// one specific case.
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(IIDecl)) {
if (FD->getType()->isDependentType())
return FD;
} else if (OverloadedFunctionDecl *Ovl
= dyn_cast<OverloadedFunctionDecl>(IIDecl)) {
for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(),
FEnd = Ovl->function_end();
F != FEnd; ++F) {
if ((*F)->getType()->isDependentType())
return Ovl;
}
}
return 0;
}
return 0;
}
/// DiagnoseTemplateParameterShadow - Produce a diagnostic complaining
/// that the template parameter 'PrevDecl' is being shadowed by a new
/// declaration at location Loc. Returns true to indicate that this is
/// an error, and false otherwise.
bool Sema::DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl) {
assert(PrevDecl->isTemplateParameter() && "Not a template parameter");
// Microsoft Visual C++ permits template parameters to be shadowed.
if (getLangOptions().Microsoft)
return false;
// C++ [temp.local]p4:
// A template-parameter shall not be redeclared within its
// scope (including nested scopes).
Diag(Loc, diag::err_template_param_shadow)
<< cast<NamedDecl>(PrevDecl)->getDeclName();
Diag(PrevDecl->getLocation(), diag::note_template_param_here);
return true;
}
/// ActOnTypeParameter - Called when a C++ template type parameter
/// (e.g., "typename T") has been parsed. Typename specifies whether
/// the keyword "typename" was used to declare the type parameter
/// (otherwise, "class" was used), and KeyLoc is the location of the
/// "class" or "typename" keyword. ParamName is the name of the
/// parameter (NULL indicates an unnamed template parameter) and
/// ParamName is the location of the parameter name (if any).
/// If the type parameter has a default argument, it will be added
/// later via ActOnTypeParameterDefault.
Sema::DeclTy *Sema::ActOnTypeParameter(Scope *S, bool Typename,
SourceLocation KeyLoc,
IdentifierInfo *ParamName,
SourceLocation ParamNameLoc,
unsigned Depth, unsigned Position) {
assert(S->isTemplateParamScope() &&
"Template type parameter not in template parameter scope!");
bool Invalid = false;
if (ParamName) {
Decl *PrevDecl = LookupDecl(ParamName, Decl::IDNS_Tag, S);
if (PrevDecl && PrevDecl->isTemplateParameter())
Invalid = Invalid || DiagnoseTemplateParameterShadow(ParamNameLoc,
PrevDecl);
}
TemplateTypeParmDecl *Param
= TemplateTypeParmDecl::Create(Context, CurContext,
ParamNameLoc, ParamName, Typename);
if (Invalid)
Param->setInvalidDecl();
if (ParamName) {
// Add the template parameter into the current scope.
S->AddDecl(Param);
IdResolver.AddDecl(Param);
}
return Param;
}
/// ActOnNonTypeTemplateParameter - Called when a C++ non-type
/// template parameter (e.g., "int Size" in "template<int Size>
/// class Array") has been parsed. S is the current scope and D is
/// the parsed declarator.
Sema::DeclTy *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
unsigned Depth,
unsigned Position) {
QualType T = GetTypeForDeclarator(D, S);
assert(S->isTemplateParamScope() &&
"Template type parameter not in template parameter scope!");
bool Invalid = false;
IdentifierInfo *ParamName = D.getIdentifier();
if (ParamName) {
Decl *PrevDecl = LookupDecl(ParamName, Decl::IDNS_Tag, S);
if (PrevDecl && PrevDecl->isTemplateParameter())
Invalid = Invalid || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
PrevDecl);
}
NonTypeTemplateParmDecl *Param
= NonTypeTemplateParmDecl::Create(Context, CurContext, D.getIdentifierLoc(),
ParamName, T);
if (Invalid)
Param->setInvalidDecl();
if (D.getIdentifier()) {
// Add the template parameter into the current scope.
S->AddDecl(Param);
IdResolver.AddDecl(Param);
}
return Param;
}
/// ActOnTemplateParameterList - Builds a TemplateParameterList that
/// contains the template parameters in Params/NumParams.
Sema::TemplateParamsTy *
Sema::ActOnTemplateParameterList(unsigned Depth,
SourceLocation ExportLoc,
SourceLocation TemplateLoc,
SourceLocation LAngleLoc,
DeclTy **Params, unsigned NumParams,
SourceLocation RAngleLoc) {
if (ExportLoc.isValid())
Diag(ExportLoc, diag::note_template_export_unsupported);
return TemplateParameterList::Create(Context, (Decl**)Params, NumParams);
}
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