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//===--- SemaTemplateInstantiateStmt.cpp - C++ Template Stmt 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 statements.
//
//===----------------------------------------------------------------------===/
#include "Sema.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprCXX.h"
#include "clang/Parse/DeclSpec.h"
#include "llvm/Support/Compiler.h"
using namespace clang;
namespace {
class VISIBILITY_HIDDEN TemplateStmtInstantiator
: public StmtVisitor<TemplateStmtInstantiator, Sema::OwningStmtResult> {
Sema &SemaRef;
const TemplateArgumentList &TemplateArgs;
public:
typedef Sema::OwningExprResult OwningExprResult;
typedef Sema::OwningStmtResult OwningStmtResult;
TemplateStmtInstantiator(Sema &SemaRef,
const TemplateArgumentList &TemplateArgs)
: SemaRef(SemaRef), TemplateArgs(TemplateArgs) { }
// FIXME: Once we get closer to completion, replace these
// manually-written declarations with automatically-generated ones
// from clang/AST/StmtNodes.def.
OwningStmtResult VisitDeclStmt(DeclStmt *S);
OwningStmtResult VisitNullStmt(NullStmt *S);
OwningStmtResult VisitCompoundStmt(CompoundStmt *S);
OwningStmtResult VisitIfStmt(IfStmt *S);
OwningStmtResult VisitExpr(Expr *E);
OwningStmtResult VisitLabelStmt(LabelStmt *S);
OwningStmtResult VisitGotoStmt(GotoStmt *S);
OwningStmtResult VisitReturnStmt(ReturnStmt *S);
// Base case. I'm supposed to ignore this.
OwningStmtResult VisitStmt(Stmt *S) {
S->dump();
assert(false && "Cannot instantiate this kind of statement");
return SemaRef.StmtError();
}
};
}
Sema::OwningStmtResult TemplateStmtInstantiator::VisitDeclStmt(DeclStmt *S) {
llvm::SmallVector<Decl *, 8> Decls;
for (DeclStmt::decl_iterator D = S->decl_begin(), DEnd = S->decl_end();
D != DEnd; ++D) {
Decl *Instantiated = SemaRef.InstantiateDecl(*D, SemaRef.CurContext,
TemplateArgs);
if (!Instantiated)
return SemaRef.StmtError();
Decls.push_back(Instantiated);
SemaRef.CurrentInstantiationScope->InstantiatedLocal(cast<VarDecl>(*D),
cast<VarDecl>(Instantiated));
}
return SemaRef.Owned(new (SemaRef.Context) DeclStmt(
DeclGroupRef::Create(SemaRef.Context,
&Decls[0],
Decls.size()),
S->getStartLoc(),
S->getEndLoc()));
}
Sema::OwningStmtResult TemplateStmtInstantiator::VisitNullStmt(NullStmt *S) {
return SemaRef.Owned(S->Clone(SemaRef.Context));
}
Sema::OwningStmtResult TemplateStmtInstantiator::VisitLabelStmt(LabelStmt *S) {
OwningStmtResult SubStmt = Visit(S->getSubStmt());
if (SubStmt.isInvalid())
return SemaRef.StmtError();
// FIXME: Pass the real colon loc in.
return SemaRef.ActOnLabelStmt(S->getIdentLoc(), S->getID(), SourceLocation(),
move(SubStmt));
}
Sema::OwningStmtResult TemplateStmtInstantiator::VisitGotoStmt(GotoStmt *S) {
return SemaRef.ActOnGotoStmt(S->getGotoLoc(), S->getLabelLoc(),
S->getLabel()->getID());
}
Sema::OwningStmtResult
TemplateStmtInstantiator::VisitReturnStmt(ReturnStmt *S) {
Sema::OwningExprResult Result =
SemaRef.InstantiateExpr(S->getRetValue(), TemplateArgs);
if (Result.isInvalid())
return SemaRef.StmtError();
return SemaRef.ActOnReturnStmt(S->getReturnLoc(), move(Result));
}
Sema::OwningStmtResult
TemplateStmtInstantiator::VisitCompoundStmt(CompoundStmt *S) {
// FIXME: We need an *easy* RAII way to delete these statements if
// something goes wrong.
llvm::SmallVector<Stmt *, 16> Statements;
for (CompoundStmt::body_iterator B = S->body_begin(), BEnd = S->body_end();
B != BEnd; ++B) {
OwningStmtResult Result = Visit(*B);
if (Result.isInvalid()) {
// FIXME: This should be handled by an RAII destructor.
for (unsigned I = 0, N = Statements.size(); I != N; ++I)
Statements[I]->Destroy(SemaRef.Context);
return SemaRef.StmtError();
}
Statements.push_back(Result.takeAs<Stmt>());
}
return SemaRef.Owned(
new (SemaRef.Context) CompoundStmt(SemaRef.Context,
&Statements[0],
Statements.size(),
S->getLBracLoc(),
S->getRBracLoc()));
}
Sema::OwningStmtResult TemplateStmtInstantiator::VisitIfStmt(IfStmt *S) {
// Instantiate the condition
OwningExprResult Cond = SemaRef.InstantiateExpr(S->getCond(), TemplateArgs);
if (Cond.isInvalid())
return SemaRef.StmtError();
// Instantiate the "then" branch.
OwningStmtResult Then = SemaRef.InstantiateStmt(S->getThen(), TemplateArgs);
if (Then.isInvalid())
return SemaRef.StmtError();
// Instantiate the "else" branch.
OwningStmtResult Else = SemaRef.InstantiateStmt(S->getElse(), TemplateArgs);
if (Else.isInvalid())
return SemaRef.StmtError();
return SemaRef.ActOnIfStmt(S->getIfLoc(), move(Cond), move(Then),
S->getElseLoc(), move(Else));
}
Sema::OwningStmtResult TemplateStmtInstantiator::VisitExpr(Expr *E) {
Sema::OwningExprResult Result = SemaRef.InstantiateExpr(E, TemplateArgs);
if (Result.isInvalid())
return SemaRef.StmtError();
return SemaRef.Owned(Result.takeAs<Stmt>());
}
Sema::OwningStmtResult
Sema::InstantiateStmt(Stmt *S, const TemplateArgumentList &TemplateArgs) {
TemplateStmtInstantiator Instantiator(*this, TemplateArgs);
return Instantiator.Visit(S);
}
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