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Attr.cpp
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//===--- Attr.cpp - Swift Language Attr ASTs ------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This file implements routines relating to declaration attributes.
//
//===----------------------------------------------------------------------===//
#include "swift/AST/Attr.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/ASTPrinter.h"
#include "swift/AST/Decl.h"
#include "swift/AST/Expr.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/IndexSubset.h"
#include "swift/AST/LazyResolver.h"
#include "swift/AST/Module.h"
#include "swift/AST/NameLookupRequests.h"
#include "swift/AST/ParameterList.h"
#include "swift/AST/TypeCheckRequests.h"
#include "swift/AST/TypeRepr.h"
#include "swift/AST/Types.h"
#include "swift/Basic/Defer.h"
#include "swift/Basic/QuotedString.h"
#include "swift/Strings.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace swift;
#define DECL_ATTR(_, Id, ...) \
static_assert(IsTriviallyDestructible<Id##Attr>::value, \
"Attrs are BumpPtrAllocated; the destructor is never called");
#include "swift/AST/Attr.def"
static_assert(IsTriviallyDestructible<DeclAttributes>::value,
"DeclAttributes are BumpPtrAllocated; the d'tor is never called");
static_assert(IsTriviallyDestructible<TypeAttributes>::value,
"TypeAttributes are BumpPtrAllocated; the d'tor is never called");
#define DECL_ATTR(Name, Id, ...) \
static_assert(DeclAttribute::isOptionSetFor##Id(DeclAttribute::DeclAttrOptions::ABIBreakingToAdd) != \
DeclAttribute::isOptionSetFor##Id(DeclAttribute::DeclAttrOptions::ABIStableToAdd), \
#Name " needs to specify either ABIBreakingToAdd or ABIStableToAdd");
#include "swift/AST/Attr.def"
#define DECL_ATTR(Name, Id, ...) \
static_assert(DeclAttribute::isOptionSetFor##Id(DeclAttribute::DeclAttrOptions::ABIBreakingToRemove) != \
DeclAttribute::isOptionSetFor##Id(DeclAttribute::DeclAttrOptions::ABIStableToRemove), \
#Name " needs to specify either ABIBreakingToRemove or ABIStableToRemove");
#include "swift/AST/Attr.def"
#define DECL_ATTR(Name, Id, ...) \
static_assert(DeclAttribute::isOptionSetFor##Id(DeclAttribute::DeclAttrOptions::APIBreakingToAdd) != \
DeclAttribute::isOptionSetFor##Id(DeclAttribute::DeclAttrOptions::APIStableToAdd), \
#Name " needs to specify either APIBreakingToAdd or APIStableToAdd");
#include "swift/AST/Attr.def"
#define DECL_ATTR(Name, Id, ...) \
static_assert(DeclAttribute::isOptionSetFor##Id(DeclAttribute::DeclAttrOptions::APIBreakingToRemove) != \
DeclAttribute::isOptionSetFor##Id(DeclAttribute::DeclAttrOptions::APIStableToRemove), \
#Name " needs to specify either APIBreakingToRemove or APIStableToRemove");
#include "swift/AST/Attr.def"
StringRef swift::getAccessLevelSpelling(AccessLevel value) {
switch (value) {
case AccessLevel::Private: return "private";
case AccessLevel::FilePrivate: return "fileprivate";
case AccessLevel::Internal: return "internal";
case AccessLevel::Package: return "package";
case AccessLevel::Public: return "public";
case AccessLevel::Open: return "open";
}
llvm_unreachable("Unhandled AccessLevel in switch.");
}
void TypeAttributes::getConventionArguments(SmallVectorImpl<char> &buf) const {
llvm::raw_svector_ostream stream(buf);
auto &convention = ConventionArguments.value();
stream << convention.Name;
if (convention.WitnessMethodProtocol) {
stream << ": " << convention.WitnessMethodProtocol;
return;
}
if (!convention.ClangType.Item.empty())
stream << ", cType: " << QuotedString(convention.ClangType.Item);
}
/// Given a name like "autoclosure", return the type attribute ID that
/// corresponds to it. This returns TAK_Count on failure.
///
TypeAttrKind TypeAttributes::getAttrKindFromString(StringRef Str) {
return llvm::StringSwitch<TypeAttrKind>(Str)
#define TYPE_ATTR(X) .Case(#X, TAK_##X)
#include "swift/AST/Attr.def"
.Default(TAK_Count);
}
/// Return the name (like "autoclosure") for an attribute ID.
const char *TypeAttributes::getAttrName(TypeAttrKind kind) {
switch (kind) {
default: llvm_unreachable("Invalid attribute ID");
#define TYPE_ATTR(X) case TAK_##X: return #X;
#include "swift/AST/Attr.def"
}
}
/// Given a name like "inline", return the decl attribute ID that corresponds
/// to it. Note that this is a many-to-one mapping, and that the identifier
/// passed in may only be the first portion of the attribute (e.g. in the case
/// of the 'unowned(unsafe)' attribute, the string passed in is 'unowned'.
///
/// Also note that this recognizes both attributes like '@inline' (with no @)
/// and decl modifiers like 'final'. This returns DAK_Count on failure.
///
DeclAttrKind DeclAttribute::getAttrKindFromString(StringRef Str) {
return llvm::StringSwitch<DeclAttrKind>(Str)
#define DECL_ATTR(X, CLASS, ...) .Case(#X, DAK_##CLASS)
#define DECL_ATTR_ALIAS(X, CLASS) .Case(#X, DAK_##CLASS)
#include "swift/AST/Attr.def"
.Case(SPI_AVAILABLE_ATTRNAME, DAK_Available)
.Default(DAK_Count);
}
/// Returns true if this attribute can appear on the specified decl.
bool DeclAttribute::canAttributeAppearOnDecl(DeclAttrKind DK, const Decl *D) {
if ((getOptions(DK) & OnAnyClangDecl) && D->hasClangNode())
return true;
return canAttributeAppearOnDeclKind(DK, D->getKind());
}
bool DeclAttribute::canAttributeAppearOnDeclKind(DeclAttrKind DAK, DeclKind DK) {
auto Options = getOptions(DAK);
switch (DK) {
#define DECL(Id, Parent) case DeclKind::Id: return (Options & On##Id) != 0;
#include "swift/AST/DeclNodes.def"
}
llvm_unreachable("bad DeclKind");
}
bool
DeclAttributes::isUnavailableInSwiftVersion(
const version::Version &effectiveVersion) const {
llvm::VersionTuple vers = effectiveVersion;
for (auto attr : *this) {
if (auto available = dyn_cast<AvailableAttr>(attr)) {
if (available->isInvalid())
continue;
if (available->getPlatformAgnosticAvailability() ==
PlatformAgnosticAvailabilityKind::SwiftVersionSpecific) {
if (available->Introduced.has_value() &&
available->Introduced.value() > vers)
return true;
if (available->Obsoleted.has_value() &&
available->Obsoleted.value() <= vers)
return true;
}
}
}
return false;
}
const AvailableAttr *
DeclAttributes::findMostSpecificActivePlatform(const ASTContext &ctx) const{
const AvailableAttr *bestAttr = nullptr;
for (auto attr : *this) {
auto *avAttr = dyn_cast<AvailableAttr>(attr);
if (!avAttr)
continue;
if (avAttr->isInvalid())
continue;
if (!avAttr->hasPlatform())
continue;
if (!avAttr->isActivePlatform(ctx))
continue;
// We have an attribute that is active for the platform, but
// is it more specific than our current best?
if (!bestAttr || inheritsAvailabilityFromPlatform(avAttr->Platform,
bestAttr->Platform)) {
bestAttr = avAttr;
}
}
return bestAttr;
}
const AvailableAttr *
DeclAttributes::getPotentiallyUnavailable(const ASTContext &ctx) const {
const AvailableAttr *potential = nullptr;
const AvailableAttr *conditional = nullptr;
for (auto Attr : *this)
if (auto AvAttr = dyn_cast<AvailableAttr>(Attr)) {
if (AvAttr->isInvalid())
continue;
if (!AvAttr->isActivePlatform(ctx) &&
!AvAttr->isLanguageVersionSpecific() &&
!AvAttr->isPackageDescriptionVersionSpecific())
continue;
// Definitely not available.
if (AvAttr->isUnconditionallyUnavailable())
return AvAttr;
switch (AvAttr->getVersionAvailability(ctx)) {
case AvailableVersionComparison::Available:
// Doesn't limit the introduced version.
break;
case AvailableVersionComparison::PotentiallyUnavailable:
// We'll return this if we don't see something that proves it's
// not available in this version.
potential = AvAttr;
break;
case AvailableVersionComparison::Unavailable:
case AvailableVersionComparison::Obsoleted:
conditional = AvAttr;
break;
}
}
if (conditional)
return conditional;
return potential;
}
const AvailableAttr *DeclAttributes::getUnavailable(
const ASTContext &ctx) const {
const AvailableAttr *conditional = nullptr;
const AvailableAttr *bestActive = findMostSpecificActivePlatform(ctx);
for (auto Attr : *this)
if (auto AvAttr = dyn_cast<AvailableAttr>(Attr)) {
if (AvAttr->isInvalid())
continue;
// If this is a platform-specific attribute and it isn't the most
// specific attribute for the current platform, we're done.
if (AvAttr->hasPlatform() &&
(!bestActive || AvAttr != bestActive))
continue;
// If this attribute doesn't apply to the active platform, we're done.
if (!AvAttr->isActivePlatform(ctx) &&
!AvAttr->isLanguageVersionSpecific() &&
!AvAttr->isPackageDescriptionVersionSpecific())
continue;
// Unconditional unavailable.
if (AvAttr->isUnconditionallyUnavailable())
return AvAttr;
switch (AvAttr->getVersionAvailability(ctx)) {
case AvailableVersionComparison::Available:
case AvailableVersionComparison::PotentiallyUnavailable:
break;
case AvailableVersionComparison::Obsoleted:
case AvailableVersionComparison::Unavailable:
conditional = AvAttr;
break;
}
}
return conditional;
}
const AvailableAttr *
DeclAttributes::getDeprecated(const ASTContext &ctx) const {
const AvailableAttr *conditional = nullptr;
const AvailableAttr *bestActive = findMostSpecificActivePlatform(ctx);
for (auto Attr : *this) {
if (auto AvAttr = dyn_cast<AvailableAttr>(Attr)) {
if (AvAttr->isInvalid())
continue;
if (AvAttr->hasPlatform() &&
(!bestActive || AvAttr != bestActive))
continue;
if (!AvAttr->isActivePlatform(ctx) &&
!AvAttr->isLanguageVersionSpecific() &&
!AvAttr->isPackageDescriptionVersionSpecific())
continue;
// Unconditional deprecated.
if (AvAttr->isUnconditionallyDeprecated())
return AvAttr;
llvm::Optional<llvm::VersionTuple> DeprecatedVersion = AvAttr->Deprecated;
if (!DeprecatedVersion.has_value())
continue;
llvm::VersionTuple MinVersion = AvAttr->getActiveVersion(ctx);
// We treat the declaration as deprecated if it is deprecated on
// all deployment targets.
// Once availability checking is enabled by default, we should
// query the type refinement context hierarchy to determine
// whether a declaration is deprecated on all versions
// allowed by the context containing the reference.
if (DeprecatedVersion.value() <= MinVersion) {
conditional = AvAttr;
}
}
}
return conditional;
}
const AvailableAttr *
DeclAttributes::getSoftDeprecated(const ASTContext &ctx) const {
const AvailableAttr *conditional = nullptr;
const AvailableAttr *bestActive = findMostSpecificActivePlatform(ctx);
for (auto Attr : *this) {
if (auto AvAttr = dyn_cast<AvailableAttr>(Attr)) {
if (AvAttr->isInvalid())
continue;
if (AvAttr->hasPlatform() &&
(!bestActive || AvAttr != bestActive))
continue;
if (!AvAttr->isActivePlatform(ctx) &&
!AvAttr->isLanguageVersionSpecific() &&
!AvAttr->isPackageDescriptionVersionSpecific())
continue;
llvm::Optional<llvm::VersionTuple> DeprecatedVersion = AvAttr->Deprecated;
if (!DeprecatedVersion.has_value())
continue;
llvm::VersionTuple ActiveVersion = AvAttr->getActiveVersion(ctx);
if (DeprecatedVersion.value() > ActiveVersion) {
conditional = AvAttr;
}
}
}
return conditional;
}
const AvailableAttr *DeclAttributes::getNoAsync(const ASTContext &ctx) const {
const AvailableAttr *bestAttr = nullptr;
for (const DeclAttribute *attr : *this) {
if (const AvailableAttr *avAttr = dyn_cast<AvailableAttr>(attr)) {
if (avAttr->isInvalid())
continue;
if (avAttr->getPlatformAgnosticAvailability() ==
PlatformAgnosticAvailabilityKind::NoAsync) {
// An API may only be unavailable on specific platforms.
// If it doesn't have a platform associated with it, then it's
// unavailable for all platforms, so we should include it. If it does
// have a platform and we are not that platform, then it doesn't apply
// to us.
const bool isGoodForPlatform =
(avAttr->hasPlatform() && avAttr->isActivePlatform(ctx)) ||
!avAttr->hasPlatform();
if (!isGoodForPlatform)
continue;
if (!bestAttr) {
// If there is no best attr selected
// and the attr either has an active platform, or doesn't have one at
// all, select it.
bestAttr = avAttr;
} else if (bestAttr && avAttr->hasPlatform() &&
bestAttr->hasPlatform() &&
inheritsAvailabilityFromPlatform(avAttr->Platform,
bestAttr->Platform)) {
// if they both have a viable platform, use the better one
bestAttr = avAttr;
} else if (avAttr->hasPlatform() && !bestAttr->hasPlatform()) {
// Use the one more specific
bestAttr = avAttr;
}
}
}
}
return bestAttr;
}
const BackDeployedAttr *
DeclAttributes::getBackDeployed(const ASTContext &ctx) const {
const BackDeployedAttr *bestAttr = nullptr;
for (auto attr : *this) {
auto *backDeployedAttr = dyn_cast<BackDeployedAttr>(attr);
if (!backDeployedAttr)
continue;
if (backDeployedAttr->isInvalid() ||
!backDeployedAttr->isActivePlatform(ctx))
continue;
// We have an attribute that is active for the platform, but
// is it more specific than our current best?
if (!bestAttr || inheritsAvailabilityFromPlatform(
backDeployedAttr->Platform, bestAttr->Platform)) {
bestAttr = backDeployedAttr;
}
}
return bestAttr;
}
void DeclAttributes::dump(const Decl *D) const {
StreamPrinter P(llvm::errs());
PrintOptions PO = PrintOptions::printDeclarations();
print(P, PO, D);
}
/// Returns true if the attribute can be presented as a short form available
/// attribute (e.g., as @available(iOS 8.0, *). The presentation requires an
/// introduction version and does not support deprecation, obsoletion, or
/// messages.
LLVM_READONLY
static bool isShortAvailable(const DeclAttribute *DA) {
auto *AvailAttr = dyn_cast<AvailableAttr>(DA);
if (!AvailAttr)
return false;
if (AvailAttr->IsSPI)
return false;
if (!AvailAttr->Introduced.has_value())
return false;
if (AvailAttr->Deprecated.has_value())
return false;
if (AvailAttr->Obsoleted.has_value())
return false;
if (!AvailAttr->Message.empty())
return false;
if (!AvailAttr->Rename.empty())
return false;
switch (AvailAttr->PlatformAgnostic) {
case PlatformAgnosticAvailabilityKind::Deprecated:
case PlatformAgnosticAvailabilityKind::Unavailable:
case PlatformAgnosticAvailabilityKind::UnavailableInSwift:
case PlatformAgnosticAvailabilityKind::NoAsync:
return false;
case PlatformAgnosticAvailabilityKind::None:
case PlatformAgnosticAvailabilityKind::SwiftVersionSpecific:
case PlatformAgnosticAvailabilityKind::PackageDescriptionVersionSpecific:
return true;
}
return true;
}
/// Return true when another availability attribute implies the same availability as this
/// attribute and so printing the attribute can be skipped to de-clutter the declaration
/// when printing the short form.
/// For example, iOS availability implies macCatalyst availability so if attributes for
/// both are present and they have the same 'introduced' version, we can skip printing an
/// explicit availability for macCatalyst.
static bool isShortFormAvailabilityImpliedByOther(const AvailableAttr *Attr,
ArrayRef<const DeclAttribute *> Others) {
assert(isShortAvailable(Attr));
for (auto *DA : Others) {
auto *Other = cast<AvailableAttr>(DA);
if (Attr->Platform == Other->Platform)
continue;
if (!inheritsAvailabilityFromPlatform(Attr->Platform, Other->Platform))
continue;
if (Attr->Introduced == Other->Introduced)
return true;
}
return false;
}
/// Print the short-form @available() attribute for an array of long-form
/// AvailableAttrs that can be represented in the short form.
/// For example, for:
/// @available(OSX, introduced: 10.10)
/// @available(iOS, introduced: 8.0)
/// this will print:
/// @available(OSX 10.10, iOS 8.0, *)
static void printShortFormAvailable(ArrayRef<const DeclAttribute *> Attrs,
ASTPrinter &Printer,
const PrintOptions &Options,
bool forAtSpecialize = false) {
assert(!Attrs.empty());
if (!forAtSpecialize)
Printer << "@available(";
auto FirstAvail = cast<AvailableAttr>(Attrs.front());
if (Attrs.size() == 1 &&
FirstAvail->getPlatformAgnosticAvailability() !=
PlatformAgnosticAvailabilityKind::None) {
assert(FirstAvail->Introduced.has_value());
if (FirstAvail->isLanguageVersionSpecific()) {
Printer << "swift ";
} else {
assert(FirstAvail->isPackageDescriptionVersionSpecific());
Printer << "_PackageDescription ";
}
Printer << FirstAvail->Introduced.value().getAsString();
if (!forAtSpecialize)
Printer << ")";
} else {
for (auto *DA : Attrs) {
auto *AvailAttr = cast<AvailableAttr>(DA);
assert(AvailAttr->Introduced.has_value());
// Avoid omitting available attribute when we are printing module interface.
if (!Options.IsForSwiftInterface &&
isShortFormAvailabilityImpliedByOther(AvailAttr, Attrs))
continue;
Printer << platformString(AvailAttr->Platform) << " "
<< AvailAttr->Introduced.value().getAsString() << ", ";
}
Printer << "*";
if (!forAtSpecialize)
Printer << ")";
}
if (!forAtSpecialize)
Printer.printNewline();
}
static void printShortFormBackDeployed(ArrayRef<const DeclAttribute *> Attrs,
ASTPrinter &Printer,
const PrintOptions &Options) {
assert(!Attrs.empty());
Printer << "@backDeployed(before: ";
bool isFirst = true;
for (auto *DA : Attrs) {
if (!isFirst)
Printer << ", ";
auto *attr = cast<BackDeployedAttr>(DA);
Printer << platformString(attr->Platform) << " "
<< attr->Version.getAsString();
isFirst = false;
}
Printer << ")";
Printer.printNewline();
}
/// The kind of a parameter in a `wrt:` differentiation parameters clause:
/// either a differentiability parameter or a linearity parameter. Used for
/// printing `@differentiable`, `@derivative`, and `@transpose` attributes.
enum class DifferentiationParameterKind {
/// A differentiability parameter, printed by name.
/// Used for `@differentiable` and `@derivative` attribute.
Differentiability,
/// A linearity parameter, printed by index.
/// Used for `@transpose` attribute.
Linearity
};
/// Returns the differentiation parameters clause string for the given function,
/// parameter indices, parsed parameters, and differentiation parameter kind.
/// Use the parameter indices if specified; otherwise, use the parsed
/// parameters.
static std::string getDifferentiationParametersClauseString(
const AbstractFunctionDecl *function, IndexSubset *parameterIndices,
ArrayRef<ParsedAutoDiffParameter> parsedParams,
DifferentiationParameterKind parameterKind) {
assert(function);
bool isInstanceMethod = function->isInstanceMember();
bool isStaticMethod = function->isStatic();
std::string result;
llvm::raw_string_ostream printer(result);
// Use the parameter indices, if specified.
if (parameterIndices) {
auto parameters = parameterIndices->getBitVector();
auto parameterCount = parameters.count();
printer << "wrt: ";
if (parameterCount > 1)
printer << '(';
// Check if differentiating wrt `self`. If so, manually print it first.
bool isWrtSelf =
(isInstanceMethod ||
(isStaticMethod &&
parameterKind == DifferentiationParameterKind::Linearity)) &&
parameters.test(parameters.size() - 1);
if (isWrtSelf) {
parameters.reset(parameters.size() - 1);
printer << "self";
if (parameters.any())
printer << ", ";
}
// Print remaining differentiation parameters.
interleave(parameters.set_bits(), [&](unsigned index) {
switch (parameterKind) {
// Print differentiability parameters by name.
case DifferentiationParameterKind::Differentiability:
printer << function->getParameters()->get(index)->getName().str();
break;
// Print linearity parameters by index.
case DifferentiationParameterKind::Linearity:
printer << index;
break;
}
}, [&] { printer << ", "; });
if (parameterCount > 1)
printer << ')';
}
// Otherwise, use the parsed parameters.
else if (!parsedParams.empty()) {
printer << "wrt: ";
if (parsedParams.size() > 1)
printer << '(';
interleave(parsedParams, [&](const ParsedAutoDiffParameter ¶m) {
switch (param.getKind()) {
case ParsedAutoDiffParameter::Kind::Named:
printer << param.getName();
break;
case ParsedAutoDiffParameter::Kind::Self:
printer << "self";
break;
case ParsedAutoDiffParameter::Kind::Ordered:
auto *paramList = function->getParameters();
assert(param.getIndex() <= paramList->size() &&
"wrt parameter is out of range");
auto *funcParam = paramList->get(param.getIndex());
printer << funcParam->getNameStr();
break;
}
}, [&] { printer << ", "; });
if (parsedParams.size() > 1)
printer << ')';
}
return printer.str();
}
/// Print the arguments of the given `@differentiable` attribute.
/// - If `omitWrtClause` is true, omit printing the `wrt:` differentiation
/// parameters clause.
static void printDifferentiableAttrArguments(
const DifferentiableAttr *attr, ASTPrinter &printer,
const PrintOptions &Options, const Decl *D, bool omitWrtClause = false) {
// Create a temporary string for the attribute argument text.
std::string attrArgText;
llvm::raw_string_ostream stream(attrArgText);
// Print comma if not leading clause.
bool isLeadingClause = false;
auto printCommaIfNecessary = [&] {
if (isLeadingClause) {
isLeadingClause = false;
return;
}
stream << ", ";
};
// Print if the function is marked as linear.
switch (attr->getDifferentiabilityKind()) {
case DifferentiabilityKind::Normal:
isLeadingClause = true;
break;
case DifferentiabilityKind::Forward:
stream << "_forward";
break;
case DifferentiabilityKind::Reverse:
stream << "reverse";
break;
case DifferentiabilityKind::Linear:
stream << "_linear";
break;
case DifferentiabilityKind::NonDifferentiable:
llvm_unreachable("Impossible case `NonDifferentiable`");
}
// If the declaration is not available, there is not enough context to print
// the differentiability parameters or the 'where' clause, so just print the
// differentiability kind if applicable (when not `Normal`).
if (!D) {
if (attr->getDifferentiabilityKind() != DifferentiabilityKind::Normal) {
printer << '(' << stream.str() << ')';
}
return;
}
// Get original function.
auto *original = dyn_cast<AbstractFunctionDecl>(D);
// Handle stored/computed properties and subscript methods.
if (auto *asd = dyn_cast<AbstractStorageDecl>(D))
original = asd->getAccessor(AccessorKind::Get);
assert(original && "Must resolve original declaration");
// Print differentiation parameters clause, unless it is to be omitted.
if (!omitWrtClause) {
auto diffParamsString = getDifferentiationParametersClauseString(
original, attr->getParameterIndices(), attr->getParsedParameters(),
DifferentiationParameterKind::Differentiability);
// Check whether differentiation parameter clause is empty.
// Handles edge case where resolved parameter indices are unset and
// parsed parameters are empty. This case should never trigger for
// user-visible printing.
if (!diffParamsString.empty()) {
printCommaIfNecessary();
stream << diffParamsString;
}
}
// Print 'where' clause, if any.
// First, filter out requirements satisfied by the original function's
// generic signature. They should not be printed.
ArrayRef<Requirement> derivativeRequirements;
if (auto derivativeGenSig = attr->getDerivativeGenericSignature())
derivativeRequirements = derivativeGenSig.getRequirements();
auto requirementsToPrint =
llvm::make_filter_range(derivativeRequirements, [&](Requirement req) {
if (const auto &originalGenSig = original->getGenericSignature())
if (originalGenSig->isRequirementSatisfied(req))
return false;
return true;
});
if (!requirementsToPrint.empty()) {
if (!isLeadingClause)
stream << ' ';
stream << "where ";
interleave(requirementsToPrint, [&](Requirement req) {
if (const auto &originalGenSig = original->getGenericSignature())
if (originalGenSig->isRequirementSatisfied(req))
return;
req.print(stream, Options);
}, [&] {
stream << ", ";
});
}
// If the attribute argument text is empty, return. Do not print parentheses.
if (stream.str().empty())
return;
// Otherwise, print the attribute argument text enclosed in parentheses.
printer << '(' << stream.str() << ')';
}
void DeclAttributes::print(ASTPrinter &Printer, const PrintOptions &Options,
const Decl *D) const {
if (!DeclAttrs)
return;
SmallVector<const DeclAttribute *, 8> orderedAttributes(begin(), end());
print(Printer, Options, orderedAttributes, D);
}
void DeclAttributes::print(ASTPrinter &Printer, const PrintOptions &Options,
ArrayRef<const DeclAttribute *> FlattenedAttrs,
const Decl *D) {
using AttributeVector = SmallVector<const DeclAttribute *, 8>;
// Process attributes in passes.
AttributeVector shortAvailableAttributes;
const DeclAttribute *swiftVersionAvailableAttribute = nullptr;
const DeclAttribute *packageDescriptionVersionAvailableAttribute = nullptr;
AttributeVector backDeployedAttributes;
AttributeVector longAttributes;
AttributeVector attributes;
AttributeVector modifiers;
for (auto DA : llvm::reverse(FlattenedAttrs)) {
// Always print result builder attribute.
if (!Options.PrintImplicitAttrs && DA->isImplicit())
continue;
if (!Options.PrintUserInaccessibleAttrs &&
DeclAttribute::isUserInaccessible(DA->getKind()))
continue;
if (Options.excludeAttrKind(DA->getKind()))
continue;
// If we're supposed to suppress expanded macros, check whether this is
// a macro.
if (Options.SuppressExpandedMacros) {
if (auto customAttr = dyn_cast<CustomAttr>(DA)) {
if (D->getResolvedMacro(const_cast<CustomAttr *>(customAttr)))
continue;
}
}
// If this attribute is only allowed because this is a Clang decl, don't
// print it.
if (D && D->hasClangNode()
&& !DeclAttribute::canAttributeAppearOnDeclKind(
DA->getKind(), D->getKind()))
continue;
// Be careful not to coalesce `@available(swift 5)` with other short
// `available' attributes.
if (auto *availableAttr = dyn_cast<AvailableAttr>(DA)) {
if (availableAttr->isLanguageVersionSpecific() &&
isShortAvailable(availableAttr)) {
swiftVersionAvailableAttribute = availableAttr;
continue;
}
if (availableAttr->isPackageDescriptionVersionSpecific() &&
isShortAvailable(availableAttr)) {
packageDescriptionVersionAvailableAttribute = availableAttr;
continue;
}
}
AttributeVector &which = DA->isDeclModifier() ? modifiers :
isa<BackDeployedAttr>(DA) ? backDeployedAttributes :
isShortAvailable(DA) ? shortAvailableAttributes :
DA->isLongAttribute() ? longAttributes :
attributes;
which.push_back(DA);
}
if (swiftVersionAvailableAttribute)
printShortFormAvailable(swiftVersionAvailableAttribute, Printer, Options);
if (packageDescriptionVersionAvailableAttribute)
printShortFormAvailable(packageDescriptionVersionAvailableAttribute, Printer, Options);
if (!shortAvailableAttributes.empty())
printShortFormAvailable(shortAvailableAttributes, Printer, Options);
if (!backDeployedAttributes.empty())
printShortFormBackDeployed(backDeployedAttributes, Printer, Options);
for (auto DA : longAttributes)
DA->print(Printer, Options, D);
for (auto DA : attributes)
DA->print(Printer, Options, D);
for (auto DA : modifiers)
DA->print(Printer, Options, D);
}
SourceLoc DeclAttributes::getStartLoc(bool forModifiers) const {
if (isEmpty())
return SourceLoc();
const DeclAttribute *lastAttr = nullptr;
for (auto attr : *this) {
if (attr->getRangeWithAt().Start.isValid() &&
(!forModifiers || attr->isDeclModifier()))
lastAttr = attr;
}
return lastAttr ? lastAttr->getRangeWithAt().Start : SourceLoc();
}
llvm::Optional<const DeclAttribute *>
ParsedDeclAttrFilter::operator()(const DeclAttribute *Attr) const {
if (Attr->isImplicit())
return llvm::None;
auto declLoc = decl->getStartLoc();
auto *mod = decl->getModuleContext();
auto *declFile = mod->getSourceFileContainingLocation(declLoc);
auto *attrFile = mod->getSourceFileContainingLocation(Attr->getLocation());
if (!declFile || !attrFile)
return llvm::None;
// Only attributes in the same buffer as the declaration they're attached to
// are part of the original attribute list.
if (declFile->getBufferID() != attrFile->getBufferID())
return llvm::None;
return Attr;
}
static void printAvailableAttr(const AvailableAttr *Attr, ASTPrinter &Printer,
const PrintOptions &Options) {
if (Attr->isLanguageVersionSpecific())
Printer << "swift";
else if (Attr->isPackageDescriptionVersionSpecific())
Printer << "_PackageDescription";
else
Printer << Attr->platformString();
if (Attr->isUnconditionallyUnavailable())
Printer << ", unavailable";
else if (Attr->isUnconditionallyDeprecated())
Printer << ", deprecated";
else if (Attr->isNoAsync())
Printer << ", noasync";
if (Attr->Introduced)
Printer << ", introduced: " << Attr->Introduced.value().getAsString();
if (Attr->Deprecated)
Printer << ", deprecated: " << Attr->Deprecated.value().getAsString();
if (Attr->Obsoleted)
Printer << ", obsoleted: " << Attr->Obsoleted.value().getAsString();
if (!Attr->Rename.empty()) {
Printer << ", renamed: \"" << Attr->Rename << "\"";
} else if (Attr->RenameDecl) {
Printer << ", renamed: \"";
if (auto *Accessor = dyn_cast<AccessorDecl>(Attr->RenameDecl)) {
SmallString<32> Name;
llvm::raw_svector_ostream OS(Name);
Accessor->printUserFacingName(OS);
Printer << Name.str();
} else {
Printer << Attr->RenameDecl->getName();
}
Printer << "\"";
}
// If there's no message, but this is specifically an imported
// "unavailable in Swift" attribute, synthesize a message to look good in
// the generated interface.
if (!Attr->Message.empty()) {
Printer << ", message: ";
Printer.printEscapedStringLiteral(Attr->Message);
} else if (Attr->getPlatformAgnosticAvailability() ==
PlatformAgnosticAvailabilityKind::UnavailableInSwift)
Printer << ", message: \"Not available in Swift\"";
}
bool DeclAttribute::printImpl(ASTPrinter &Printer, const PrintOptions &Options,
const Decl *D) const {
// Handle any attributes that are not printed at all before we make printer
// callbacks.
switch (getKind()) {
case DAK_ObjC:
if (Options.PrintForSIL && isImplicit())
return false;
break;
case DAK_RawDocComment:
case DAK_ObjCBridged:
case DAK_SynthesizedProtocol:
case DAK_Rethrows:
case DAK_Reasync:
case DAK_Infix:
return false;
case DAK_Override: {
if (!Options.IsForSwiftInterface)
break;
// When we are printing Swift interface, we have to skip the override keyword
// if the overridden decl is invisible from the interface. Otherwise, an error
// will occur while building the Swift module because the overriding decl
// doesn't override anything.
// We couldn't skip every `override` keywords because they change the
// ABI if the overridden decl is also publicly visible.
// For public-override-internal case, having `override` doesn't have ABI
// implication. Thus we can skip them.
if (auto *VD = dyn_cast<ValueDecl>(D)) {
if (auto *BD = VD->getOverriddenDecl()) {
// If the overridden decl won't be printed, printing override will fail
// the build of the interface file.
if (!Options.shouldPrint(BD))
return false;
if (!BD->hasClangNode() &&
!BD->getFormalAccessScope(VD->getDeclContext(),
/*treatUsableFromInlineAsPublic*/ true)
.isPublic()) {
return false;
}
}
}
break;
}
case DAK_Custom: {
auto attr = cast<CustomAttr>(this);
if (auto type =
D->getResolvedCustomAttrType(const_cast<CustomAttr *>(attr))) {
// Print custom attributes only if the attribute decl is accessible.
// FIXME: rdar://85477478 They should be rejected.
if (auto attrDecl = type->getNominalOrBoundGenericNominal()) {
if (attrDecl->getFormalAccess() < Options.AccessFilter) {
return false;
}
}
}
if (!Options.IsForSwiftInterface)
break;
// For Swift interface, we should print result builder attributes
// on parameter decls and on protocol requirements.
// Printing the attribute elsewhere isn't ABI relevant.
if (auto *VD = dyn_cast<ValueDecl>(D)) {
if (VD->getAttachedResultBuilder() == this) {
if (!isa<ParamDecl>(D) &&
!((isa<VarDecl>(D) || isa<FuncDecl>(D)) &&
isa<ProtocolDecl>(D->getDeclContext())))
return false;
}
}