steffenlarsen updated this revision to Diff 401580.
steffenlarsen added a comment.
Applied suggestions.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D114439/new/
https://reviews.llvm.org/D114439
Files:
clang/include/clang/Basic/Attr.td
clang/include/clang/Basic/DiagnosticParseKinds.td
clang/include/clang/Parse/Parser.h
clang/lib/Parse/ParseDecl.cpp
clang/lib/Parse/ParseExpr.cpp
clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
clang/test/Parser/cxx0x-attributes.cpp
clang/test/SemaTemplate/attributes.cpp
clang/utils/TableGen/ClangAttrEmitter.cpp
Index: clang/utils/TableGen/ClangAttrEmitter.cpp
===================================================================
--- clang/utils/TableGen/ClangAttrEmitter.cpp
+++ clang/utils/TableGen/ClangAttrEmitter.cpp
@@ -1164,10 +1164,12 @@
};
class VariadicExprArgument : public VariadicArgument {
+ bool AllowPack = false;
+
public:
VariadicExprArgument(const Record &Arg, StringRef Attr)
- : VariadicArgument(Arg, Attr, "Expr *")
- {}
+ : VariadicArgument(Arg, Attr, "Expr *"),
+ AllowPack(Arg.getValueAsBit("AllowPack")) {}
void writeASTVisitorTraversal(raw_ostream &OS) const override {
OS << " {\n";
@@ -2264,6 +2266,47 @@
OS << "#endif // CLANG_ATTR_THIS_ISA_IDENTIFIER_ARG_LIST\n\n";
}
+static void emitClangAttrNumArgs(RecordKeeper &Records, raw_ostream &OS) {
+ OS << "#if defined(CLANG_ATTR_NUM_ARGS)\n";
+ std::vector<Record *> Attrs = Records.getAllDerivedDefinitions("Attr");
+ for (const auto *A : Attrs) {
+ std::vector<Record *> Args = A->getValueAsListOfDefs("Args");
+ forEachUniqueSpelling(*A, [&](const FlattenedSpelling &S) {
+ OS << ".Case(\"" << S.name() << "\", " << Args.size() << ")\n";
+ });
+ }
+ OS << "#endif // CLANG_ATTR_NUM_ARGS\n\n";
+}
+
+static bool argSupportsParmPack(const Record *Arg) {
+ return !Arg->getSuperClasses().empty() &&
+ llvm::StringSwitch<bool>(
+ Arg->getSuperClasses().back().first->getName())
+ .Case("VariadicExprArgument", true)
+ .Default(false) &&
+ Arg->getValueAsBit("AllowPack");
+}
+
+static void emitClangAttrLastArgParmPackSupport(RecordKeeper &Records,
+ raw_ostream &OS) {
+ OS << "#if defined(CLANG_ATTR_LAST_ARG_PARM_PACK_SUPPORT)\n";
+ std::vector<Record *> Attrs = Records.getAllDerivedDefinitions("Attr");
+ for (const auto *A : Attrs) {
+ std::vector<Record *> Args = A->getValueAsListOfDefs("Args");
+ bool LastArgSupportsParmPack =
+ !Args.empty() && argSupportsParmPack(Args.back());
+ forEachUniqueSpelling(*A, [&](const FlattenedSpelling &S) {
+ OS << ".Case(\"" << S.name() << "\", " << LastArgSupportsParmPack
+ << ")\n";
+ });
+ }
+ OS << "#endif // CLANG_ATTR_LAST_ARG_PARM_PACK_SUPPORT\n\n";
+}
+
+static bool isArgVariadic(const Record &R, StringRef AttrName) {
+ return createArgument(R, AttrName)->isVariadic();
+}
+
static void emitAttributes(RecordKeeper &Records, raw_ostream &OS,
bool Header) {
std::vector<Record*> Attrs = Records.getAllDerivedDefinitions("Attr");
@@ -2320,6 +2363,18 @@
std::vector<std::unique_ptr<Argument>> Args;
Args.reserve(ArgRecords.size());
+ if (!ArgRecords.empty()) {
+ const bool LastArgSupportsPack = argSupportsParmPack(ArgRecords.back());
+ for (size_t I = 0; I < ArgRecords.size() - 1; ++I) {
+ assert((!LastArgSupportsPack ||
+ !isArgVariadic(*ArgRecords[I], R.getName())) &&
+ "Attributes supporting packs can only have the last "
+ "argument as variadic");
+ assert(!argSupportsParmPack(ArgRecords[I]) &&
+ "Only the last argument can allow packs");
+ }
+ }
+
bool HasOptArg = false;
bool HasFakeArg = false;
for (const auto *ArgRecord : ArgRecords) {
@@ -3382,10 +3437,6 @@
}
}
-static bool isArgVariadic(const Record &R, StringRef AttrName) {
- return createArgument(R, AttrName)->isVariadic();
-}
-
static void emitArgInfo(const Record &R, raw_ostream &OS) {
// This function will count the number of arguments specified for the
// attribute and emit the number of required arguments followed by the
@@ -4219,6 +4270,8 @@
emitClangAttrIdentifierArgList(Records, OS);
emitClangAttrVariadicIdentifierArgList(Records, OS);
emitClangAttrThisIsaIdentifierArgList(Records, OS);
+ emitClangAttrNumArgs(Records, OS);
+ emitClangAttrLastArgParmPackSupport(Records, OS);
emitClangAttrTypeArgList(Records, OS);
emitClangAttrLateParsedList(Records, OS);
}
Index: clang/test/SemaTemplate/attributes.cpp
===================================================================
--- clang/test/SemaTemplate/attributes.cpp
+++ clang/test/SemaTemplate/attributes.cpp
@@ -64,6 +64,23 @@
template<typename T> [[clang::annotate("ANNOTATE_FOO"), clang::annotate("ANNOTATE_BAR")]] void HasAnnotations();
void UseAnnotations() { HasAnnotations<int>(); }
+// CHECK: FunctionTemplateDecl {{.*}} HasPackAnnotations
+// CHECK: AnnotateAttr {{.*}} "ANNOTATE_BAZ"
+// CHECK: FunctionDecl {{.*}} HasPackAnnotations
+// CHECK: TemplateArgument{{.*}} pack
+// CHECK-NEXT: TemplateArgument{{.*}} integral 1
+// CHECK-NEXT: TemplateArgument{{.*}} integral 2
+// CHECK-NEXT: TemplateArgument{{.*}} integral 3
+// CHECK: AnnotateAttr {{.*}} "ANNOTATE_BAZ"
+// CHECK: ConstantExpr {{.*}} 'int'
+// CHECK-NEXT: value: Int 1
+// CHECK: ConstantExpr {{.*}} 'int'
+// CHECK-NEXT: value: Int 2
+// CHECK: ConstantExpr {{.*}} 'int'
+// CHECK-NEXT: value: Int 3
+template <int... Is> [[clang::annotate("ANNOTATE_BAZ", Is...)]] void HasPackAnnotations();
+void UsePackAnnotations() { HasPackAnnotations<1, 2, 3>(); }
+
namespace preferred_name {
int x [[clang::preferred_name("frank")]]; // expected-error {{expected a type}}
int y [[clang::preferred_name(int)]]; // expected-warning {{'preferred_name' attribute only applies to class templates}}
Index: clang/test/Parser/cxx0x-attributes.cpp
===================================================================
--- clang/test/Parser/cxx0x-attributes.cpp
+++ clang/test/Parser/cxx0x-attributes.cpp
@@ -259,10 +259,24 @@
[[]] return;
}
-template<typename...Ts> void variadic() {
+template <typename... Ts> void variadic() {
void bar [[noreturn...]] (); // expected-error {{attribute 'noreturn' cannot be used as an attribute pack}}
}
+template <int... Is> void variadic_nttp() {
+ void bar [[noreturn...]] (); // expected-error {{attribute 'noreturn' cannot be used as an attribute pack}}
+ void baz [[clang::no_sanitize(Is...)]] (); // expected-error {{attribute 'no_sanitize' does not support argument pack expansion}}
+ void boz [[clang::annotate(Is...)]] (); // expected-error {{pack expansion in 'annotate' may only be applied to the last argument}}
+ void bor [[clang::annotate("A", "V" ...)]] (); // expected-error {{pack expansion does not contain any unexpanded parameter packs}}
+ void bir [[clang::annotate("B", {1, 2, 3, 4})]] (); // expected-error {{'annotate' attribute requires parameter 1 to be a constant expression}} expected-note {{subexpression not valid in a constant expression}}
+ void boo [[unknown::foo(Is...)]] (); // expected-warning {{unknown attribute 'foo' ignored}}
+ void faz [[clang::annotate("C", (Is + ...))]] (); // expected-warning {{pack fold expression is a C++17 extension}}
+ void far [[clang::annotate("D", Is...)]] ();
+ void foz [[clang::annotate("E", 1, 2, 3, Is...)]] ();
+ void fiz [[clang::annotate("F", Is..., 1, 2, 3)]] ();
+ void fir [[clang::annotate("G", 1, Is..., 2, 3)]] ();
+}
+
// Expression tests
void bar () {
// FIXME: GCC accepts [[gnu::noreturn]] on a lambda, even though it appertains
Index: clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
===================================================================
--- clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -189,13 +189,9 @@
EnterExpressionEvaluationContext Unevaluated(
S, Sema::ExpressionEvaluationContext::ConstantEvaluated);
SmallVector<Expr *, 4> Args;
- Args.reserve(Attr->args_size());
- for (auto *E : Attr->args()) {
- ExprResult Result = S.SubstExpr(E, TemplateArgs);
- if (!Result.isUsable())
- return;
- Args.push_back(Result.get());
- }
+ if (S.SubstExprs(ArrayRef<Expr *>(Attr->args_begin(), Attr->args_end()),
+ /*IsCall=*/false, TemplateArgs, Args))
+ return;
S.AddAnnotationAttr(New, *Attr, Attr->getAnnotation(), Args);
}
Index: clang/lib/Parse/ParseExpr.cpp
===================================================================
--- clang/lib/Parse/ParseExpr.cpp
+++ clang/lib/Parse/ParseExpr.cpp
@@ -3356,7 +3356,9 @@
/// \endverbatim
bool Parser::ParseExpressionList(SmallVectorImpl<Expr *> &Exprs,
SmallVectorImpl<SourceLocation> &CommaLocs,
- llvm::function_ref<void()> ExpressionStarts) {
+ llvm::function_ref<void()> ExpressionStarts,
+ bool FailImmediatelyOnInvalidExpr,
+ bool EarlyTypoCorrection) {
bool SawError = false;
while (true) {
if (ExpressionStarts)
@@ -3369,6 +3371,9 @@
} else
Expr = ParseAssignmentExpression();
+ if (EarlyTypoCorrection)
+ Expr = Actions.CorrectDelayedTyposInExpr(Expr);
+
if (Tok.is(tok::ellipsis))
Expr = Actions.ActOnPackExpansion(Expr.get(), ConsumeToken());
else if (Tok.is(tok::code_completion)) {
@@ -3382,8 +3387,10 @@
break;
}
if (Expr.isInvalid()) {
- SkipUntil(tok::comma, tok::r_paren, StopBeforeMatch);
SawError = true;
+ if (FailImmediatelyOnInvalidExpr)
+ break;
+ SkipUntil(tok::comma, tok::r_paren, StopBeforeMatch);
} else {
Exprs.push_back(Expr.get());
}
Index: clang/lib/Parse/ParseDecl.cpp
===================================================================
--- clang/lib/Parse/ParseDecl.cpp
+++ clang/lib/Parse/ParseDecl.cpp
@@ -300,6 +300,25 @@
#undef CLANG_ATTR_THIS_ISA_IDENTIFIER_ARG_LIST
}
+/// Determine how many arguments an attribute has. Variadic arguments counts as
+/// a single argument.
+static size_t attributeNumberOfArguments(const IdentifierInfo &II) {
+#define CLANG_ATTR_NUM_ARGS
+ return llvm::StringSwitch<size_t>(normalizeAttrName(II.getName()))
+#include "clang/Parse/AttrParserStringSwitches.inc"
+ .Default(0);
+#undef CLANG_ATTR_NUM_ARGS
+}
+
+/// Determine if the last attribute argument supports pack expansion.
+static bool attributeLastArgParmPackSupport(const IdentifierInfo &II) {
+#define CLANG_ATTR_LAST_ARG_PARM_PACK_SUPPORT
+ return llvm::StringSwitch<bool>(normalizeAttrName(II.getName()))
+#include "clang/Parse/AttrParserStringSwitches.inc"
+ .Default(false);
+#undef CLANG_ATTR_LAST_ARG_PARM_PACK_SUPPORT
+}
+
/// Determine whether the given attribute parses a type argument.
static bool attributeIsTypeArgAttr(const IdentifierInfo &II) {
#define CLANG_ATTR_TYPE_ARG_LIST
@@ -366,6 +385,8 @@
bool ChangeKWThisToIdent = attributeTreatsKeywordThisAsIdentifier(*AttrName);
bool AttributeIsTypeArgAttr = attributeIsTypeArgAttr(*AttrName);
+ bool AttributeHasVariadicIdentifierArg =
+ attributeHasVariadicIdentifierArg(*AttrName);
// Interpret "kw_this" as an identifier if the attributed requests it.
if (ChangeKWThisToIdent && Tok.is(tok::kw_this))
@@ -374,8 +395,8 @@
ArgsVector ArgExprs;
if (Tok.is(tok::identifier)) {
// If this attribute wants an 'identifier' argument, make it so.
- bool IsIdentifierArg = attributeHasIdentifierArg(*AttrName) ||
- attributeHasVariadicIdentifierArg(*AttrName);
+ bool IsIdentifierArg = AttributeHasVariadicIdentifierArg ||
+ attributeHasIdentifierArg(*AttrName);
ParsedAttr::Kind AttrKind =
ParsedAttr::getParsedKind(AttrName, ScopeName, Syntax);
@@ -397,42 +418,94 @@
if (!ArgExprs.empty())
ConsumeToken();
- // Parse the non-empty comma-separated list of expressions.
- do {
- // Interpret "kw_this" as an identifier if the attributed requests it.
- if (ChangeKWThisToIdent && Tok.is(tok::kw_this))
- Tok.setKind(tok::identifier);
+ if (AttributeIsTypeArgAttr) {
+ // FIXME: Multiple type arguments are not implemented.
+ TypeResult T = ParseTypeName();
+ if (T.isInvalid()) {
+ SkipUntil(tok::r_paren, StopAtSemi);
+ return 0;
+ }
+ if (T.isUsable())
+ TheParsedType = T.get();
+ } else if (AttributeHasVariadicIdentifierArg) {
+ // Parse variadic identifier arg. This can either consume identifiers or
+ // expressions.
+ // FIXME: Variadic identifier args do not currently support parameter
+ // packs.
+ do {
+ // Interpret "kw_this" as an identifier if the attributed requests it.
+ if (ChangeKWThisToIdent && Tok.is(tok::kw_this))
+ Tok.setKind(tok::identifier);
+
+ ExprResult ArgExpr;
+ if (Tok.is(tok::identifier)) {
+ ArgExprs.push_back(ParseIdentifierLoc());
+ } else {
+ bool Uneval = attributeParsedArgsUnevaluated(*AttrName);
+ EnterExpressionEvaluationContext Unevaluated(
+ Actions,
+ Uneval ? Sema::ExpressionEvaluationContext::Unevaluated
+ : Sema::ExpressionEvaluationContext::ConstantEvaluated);
- ExprResult ArgExpr;
- if (AttributeIsTypeArgAttr) {
- TypeResult T = ParseTypeName();
- if (T.isInvalid()) {
+ ExprResult ArgExpr(
+ Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression()));
+
+ if (ArgExpr.isInvalid()) {
+ SkipUntil(tok::r_paren, StopAtSemi);
+ return 0;
+ }
+ ArgExprs.push_back(ArgExpr.get());
+ }
+ // Eat the comma, move to the next argument
+ } while (TryConsumeToken(tok::comma));
+ } else {
+ bool Uneval = attributeParsedArgsUnevaluated(*AttrName);
+ EnterExpressionEvaluationContext Unevaluated(
+ Actions, Uneval
+ ? Sema::ExpressionEvaluationContext::Unevaluated
+ : Sema::ExpressionEvaluationContext::ConstantEvaluated);
+
+ // General case. Parse all available expressions.
+ CommaLocsTy CommaLocs;
+ ExprVector ParsedExprs;
+ if (ParseExpressionList(ParsedExprs, CommaLocs,
+ llvm::function_ref<void()>(),
+ /*FailImmediatelyOnInvalidExpr=*/true,
+ /*EarlyTypoCorrection=*/true)) {
+ SkipUntil(tok::r_paren, StopAtSemi);
+ return 0;
+ }
+
+ // Pack expansion must currently be explicitly supported by an attribute.
+ // Additionally, this is only currently allowed in a variadic argument at
+ // the end of the attribute.
+ for (size_t I = 0; I < ParsedExprs.size(); ++I) {
+ if (!isa<PackExpansionExpr>(ParsedExprs[I]))
+ continue;
+
+ // Attribute must explicitly support parameter pack in its last
+ // argument.
+ if (!attributeLastArgParmPackSupport(*AttrName)) {
+ Diag(Tok.getLocation(),
+ diag::err_attribute_argument_parm_pack_not_supported)
+ << AttrName;
SkipUntil(tok::r_paren, StopAtSemi);
return 0;
}
- if (T.isUsable())
- TheParsedType = T.get();
- break; // FIXME: Multiple type arguments are not implemented.
- } else if (Tok.is(tok::identifier) &&
- attributeHasVariadicIdentifierArg(*AttrName)) {
- ArgExprs.push_back(ParseIdentifierLoc());
- } else {
- bool Uneval = attributeParsedArgsUnevaluated(*AttrName);
- EnterExpressionEvaluationContext Unevaluated(
- Actions,
- Uneval ? Sema::ExpressionEvaluationContext::Unevaluated
- : Sema::ExpressionEvaluationContext::ConstantEvaluated);
-
- ExprResult ArgExpr(
- Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression()));
- if (ArgExpr.isInvalid()) {
+
+ // Pack expansion is only allowed in the variadic argument at the end.
+ const size_t AttrNumArgs = attributeNumberOfArguments(*AttrName);
+ if (ArgExprs.size() + I + 1 < AttrNumArgs) {
+ Diag(Tok.getLocation(),
+ diag::err_attribute_parm_pack_last_argument_only)
+ << AttrName;
SkipUntil(tok::r_paren, StopAtSemi);
return 0;
}
- ArgExprs.push_back(ArgExpr.get());
}
- // Eat the comma, move to the next argument
- } while (TryConsumeToken(tok::comma));
+
+ ArgExprs.insert(ArgExprs.end(), ParsedExprs.begin(), ParsedExprs.end());
+ }
}
SourceLocation RParen = Tok.getLocation();
Index: clang/include/clang/Parse/Parser.h
===================================================================
--- clang/include/clang/Parse/Parser.h
+++ clang/include/clang/Parse/Parser.h
@@ -1814,7 +1814,9 @@
bool ParseExpressionList(SmallVectorImpl<Expr *> &Exprs,
SmallVectorImpl<SourceLocation> &CommaLocs,
llvm::function_ref<void()> ExpressionStarts =
- llvm::function_ref<void()>());
+ llvm::function_ref<void()>(),
+ bool FailImmediatelyOnInvalidExpr = false,
+ bool EarlyTypoCorrection = false);
/// ParseSimpleExpressionList - A simple comma-separated list of expressions,
/// used for misc language extensions.
Index: clang/include/clang/Basic/DiagnosticParseKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticParseKinds.td
+++ clang/include/clang/Basic/DiagnosticParseKinds.td
@@ -719,6 +719,10 @@
def err_l_square_l_square_not_attribute : Error<
"C++11 only allows consecutive left square brackets when "
"introducing an attribute">;
+def err_attribute_argument_parm_pack_not_supported : Error<
+ "attribute %0 does not support argument pack expansion">;
+def err_attribute_parm_pack_last_argument_only : Error<
+ "pack expansion in %0 may only be applied to the last argument">;
def err_ms_declspec_type : Error<
"__declspec attributes must be an identifier or string literal">;
def err_ms_property_no_getter_or_putter : Error<
Index: clang/include/clang/Basic/Attr.td
===================================================================
--- clang/include/clang/Basic/Attr.td
+++ clang/include/clang/Basic/Attr.td
@@ -205,7 +205,12 @@
class TypeArgument<string name, bit opt = 0> : Argument<name, opt>;
class UnsignedArgument<string name, bit opt = 0> : Argument<name, opt>;
class VariadicUnsignedArgument<string name> : Argument<name, 1>;
-class VariadicExprArgument<string name> : Argument<name, 1>;
+class VariadicExprArgument<string name, bit packs = 0> : Argument<name, 1> {
+ // Set to true if variadic expression argument supports parameter pack
+ // expansion. Setting this to true is only allowed if the argument is the last
+ // argument of the attribute.
+ bit AllowPack = packs;
+}
class VariadicStringArgument<string name> : Argument<name, 1>;
class VariadicIdentifierArgument<string name> : Argument<name, 1>;
@@ -770,7 +775,8 @@
def Annotate : InheritableParamAttr {
let Spellings = [Clang<"annotate">];
- let Args = [StringArgument<"Annotation">, VariadicExprArgument<"Args">];
+ let Args = [StringArgument<"Annotation">,
+ VariadicExprArgument<"Args", /*AllowPack*/1>];
// Ensure that the annotate attribute can be used with
// '#pragma clang attribute' even though it has no subject list.
let AdditionalMembers = [{
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