Exemplo n.º 1
0
ExprResult Sema::LookupInlineAsmIdentifier(CXXScopeSpec &SS,
                                           SourceLocation TemplateKWLoc,
                                           UnqualifiedId &Id,
                                           llvm::InlineAsmIdentifierInfo &Info,
                                           bool IsUnevaluatedContext) {
  Info.clear();

  if (IsUnevaluatedContext)
    PushExpressionEvaluationContext(UnevaluatedAbstract,
                                    ReuseLambdaContextDecl);

  ExprResult Result = ActOnIdExpression(getCurScope(), SS, TemplateKWLoc, Id,
                                        /*trailing lparen*/ false,
                                        /*is & operand*/ false,
                                        /*CorrectionCandidateCallback=*/nullptr,
                                        /*IsInlineAsmIdentifier=*/ true);

  if (IsUnevaluatedContext)
    PopExpressionEvaluationContext();

  if (!Result.isUsable()) return Result;

  Result = CheckPlaceholderExpr(Result.get());
  if (!Result.isUsable()) return Result;

  QualType T = Result.get()->getType();

  // For now, reject dependent types.
  if (T->isDependentType()) {
    Diag(Id.getLocStart(), diag::err_asm_incomplete_type) << T;
    return ExprError();
  }

  // Any sort of function type is fine.
  if (T->isFunctionType()) {
    return Result;
  }

  // Otherwise, it needs to be a complete type.
  if (RequireCompleteExprType(Result.get(), diag::err_asm_incomplete_type)) {
    return ExprError();
  }

  // Compute the type size (and array length if applicable?).
  Info.Type = Info.Size = Context.getTypeSizeInChars(T).getQuantity();
  if (T->isArrayType()) {
    const ArrayType *ATy = Context.getAsArrayType(T);
    Info.Type = Context.getTypeSizeInChars(ATy->getElementType()).getQuantity();
    Info.Length = Info.Size / Info.Type;
  }

  // We can work with the expression as long as it's not an r-value.
  if (!Result.get()->isRValue())
    Info.IsVarDecl = true;

  return Result;
}
Exemplo n.º 2
0
ExprResult Sema::LookupInlineAsmIdentifier(CXXScopeSpec &SS,
                                           SourceLocation TemplateKWLoc,
                                           UnqualifiedId &Id,
                                           llvm::InlineAsmIdentifierInfo &Info,
                                           bool IsUnevaluatedContext) {
  Info.clear();

  if (IsUnevaluatedContext)
    PushExpressionEvaluationContext(UnevaluatedAbstract,
                                    ReuseLambdaContextDecl);

  ExprResult Result = ActOnIdExpression(getCurScope(), SS, TemplateKWLoc, Id,
                                        /*trailing lparen*/ false,
                                        /*is & operand*/ false,
                                        /*CorrectionCandidateCallback=*/nullptr,
                                        /*IsInlineAsmIdentifier=*/ true);

  if (IsUnevaluatedContext)
    PopExpressionEvaluationContext();

  if (!Result.isUsable()) return Result;

  Result = CheckPlaceholderExpr(Result.get());
  if (!Result.isUsable()) return Result;

  // Referring to parameters is not allowed in naked functions.
  if (CheckNakedParmReference(Result.get(), *this))
    return ExprError();

  QualType T = Result.get()->getType();

  // For now, reject dependent types.
  if (T->isDependentType()) {
    Diag(Id.getLocStart(), diag::err_asm_incomplete_type) << T;
    return ExprError();
  }

  // Any sort of function type is fine.
  if (T->isFunctionType()) {
    return Result;
  }

  // Otherwise, it needs to be a complete type.
  if (RequireCompleteExprType(Result.get(), diag::err_asm_incomplete_type)) {
    return ExprError();
  }

  fillInlineAsmTypeInfo(Context, T, Info);

  // We can work with the expression as long as it's not an r-value.
  if (!Result.get()->isRValue())
    Info.IsVarDecl = true;

  return Result;
}
Exemplo n.º 3
0
ExprResult
Sema::LookupInlineAsmVarDeclField(Expr *E, StringRef Member,
                                  llvm::InlineAsmIdentifierInfo &Info,
                                  SourceLocation AsmLoc) {
  Info.clear();

  QualType T = E->getType();
  if (T->isDependentType()) {
    DeclarationNameInfo NameInfo;
    NameInfo.setLoc(AsmLoc);
    NameInfo.setName(&Context.Idents.get(Member));
    return CXXDependentScopeMemberExpr::Create(
        Context, E, T, /*IsArrow=*/false, AsmLoc, NestedNameSpecifierLoc(),
        SourceLocation(),
        /*FirstQualifierInScope=*/nullptr, NameInfo, /*TemplateArgs=*/nullptr);
  }

  const RecordType *RT = T->getAs<RecordType>();
  // FIXME: Diagnose this as field access into a scalar type.
  if (!RT)
    return ExprResult();

  LookupResult FieldResult(*this, &Context.Idents.get(Member), AsmLoc,
                           LookupMemberName);

  if (!LookupQualifiedName(FieldResult, RT->getDecl()))
    return ExprResult();

  // Only normal and indirect field results will work.
  ValueDecl *FD = dyn_cast<FieldDecl>(FieldResult.getFoundDecl());
  if (!FD)
    FD = dyn_cast<IndirectFieldDecl>(FieldResult.getFoundDecl());
  if (!FD)
    return ExprResult();

  // Make an Expr to thread through OpDecl.
  ExprResult Result = BuildMemberReferenceExpr(
      E, E->getType(), AsmLoc, /*IsArrow=*/false, CXXScopeSpec(),
      SourceLocation(), nullptr, FieldResult, nullptr, nullptr);
  if (Result.isInvalid())
    return Result;
  Info.OpDecl = Result.get();

  fillInlineAsmTypeInfo(Context, Result.get()->getType(), Info);

  // Fields are "variables" as far as inline assembly is concerned.
  Info.IsVarDecl = true;

  return Result;
}
Exemplo n.º 4
0
ExprResult
Sema::LookupInlineAsmVarDeclField(Expr *E, StringRef Member, unsigned &Offset,
                                  llvm::InlineAsmIdentifierInfo &Info,
                                  SourceLocation AsmLoc) {
  Info.clear();

  const RecordType *RT = E->getType()->getAs<RecordType>();
  // FIXME: Diagnose this as field access into a scalar type.
  if (!RT)
    return ExprResult();

  LookupResult FieldResult(*this, &Context.Idents.get(Member), AsmLoc,
                           LookupMemberName);

  if (!LookupQualifiedName(FieldResult, RT->getDecl()))
    return ExprResult();

  // Only normal and indirect field results will work.
  ValueDecl *FD = dyn_cast<FieldDecl>(FieldResult.getFoundDecl());
  if (!FD)
    FD = dyn_cast<IndirectFieldDecl>(FieldResult.getFoundDecl());
  if (!FD)
    return ExprResult();

  Offset = (unsigned)Context.toCharUnitsFromBits(Context.getFieldOffset(FD))
               .getQuantity();

  // Make an Expr to thread through OpDecl.
  ExprResult Result = BuildMemberReferenceExpr(
      E, E->getType(), AsmLoc, /*IsArrow=*/false, CXXScopeSpec(),
      SourceLocation(), nullptr, FieldResult, nullptr, nullptr);
  if (Result.isInvalid())
    return Result;
  Info.OpDecl = Result.get();

  fillInlineAsmTypeInfo(Context, Result.get()->getType(), Info);

  // Fields are "variables" as far as inline assembly is concerned.
  Info.IsVarDecl = true;

  return Result;
}