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ParseDecl.cpp
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//===--- ParseDecl.cpp - Swift Language Parser for Declarations -----------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2019 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
//
//===----------------------------------------------------------------------===//
//
// Declaration Parsing and AST Building
//
//===----------------------------------------------------------------------===//
#include "swift/AST/ASTWalker.h"
#include "swift/AST/Attr.h"
#include "swift/AST/DebuggerClient.h"
#include "swift/AST/Decl.h"
#include "swift/AST/DiagnosticsParse.h"
#include "swift/AST/DiagnosticsSema.h"
#include "swift/AST/GenericParamList.h"
#include "swift/AST/Initializer.h"
#include "swift/AST/LazyResolver.h"
#include "swift/AST/LifetimeDependence.h"
#include "swift/AST/Module.h"
#include "swift/AST/ParameterList.h"
#include "swift/AST/ParseRequests.h"
#include "swift/AST/SourceFile.h"
#include "swift/Basic/Defer.h"
#include "swift/Basic/Statistic.h"
#include "swift/Basic/StringExtras.h"
#include "swift/Bridging/ASTGen.h"
#include "swift/Parse/IDEInspectionCallbacks.h"
#include "swift/Parse/ParseSILSupport.h"
#include "swift/Parse/Parser.h"
#include "swift/Strings.h"
#include "swift/Subsystems.h"
#include "llvm/ADT/PointerUnion.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/SaveAndRestore.h"
#include <algorithm>
#include <initializer_list>
using namespace swift;
namespace {
/// A RAII object for deciding whether this DeclKind needs special
/// treatment when parsing in the "debugger context", and implementing
/// that treatment. The problem arises because, when lldb
/// uses swift to parse expressions, it needs to emulate the current
/// frame's scope. We do that, for instance, by making a class extension
/// and running the code in a function in that extension.
///
/// This causes two kinds of issues:
/// 1) Some DeclKinds require to be parsed in TopLevel contexts only.
/// 2) Sometimes the debugger wants a Decl to live beyond the current
/// function invocation, in which case it should be parsed at the
/// file scope level so it will be set up correctly for this purpose.
///
/// Creating an instance of this object will cause it to figure out
/// whether we are in the debugger function, and whether it needs to swap
/// the Decl that is currently being parsed.
///
/// If you are making one of these objects to address issue 1, call
/// the constructor that only takes a DeclKind, and it will be moved
/// unconditionally. Otherwise pass in the Name and DeclKind and the
/// DebuggerClient will be asked whether to move it or not.
class DebuggerContextChange {
protected:
Parser &P;
llvm::Optional<Parser::ContextChange> CC;
SourceFile *SF;
public:
DebuggerContextChange(Parser &P) : P(P), SF(nullptr) {
if (!inDebuggerContext())
return;
switchContext();
}
DebuggerContextChange(Parser &P, Identifier Name, DeclKind Kind)
: P(P), SF(nullptr) {
if (!inDebuggerContext())
return;
if (auto *client = getDebuggerClient())
if (client->shouldGlobalize(Name, Kind))
switchContext();
}
bool movedToTopLevel() {
return CC.has_value();
}
template <typename T>
ParserResult<T>
fixupParserResult(ParserResult<T> &Result) {
ParserStatus Status = Result;
return fixupParserResult(Status, Result.getPtrOrNull());
}
template <typename T>
ParserResult<T>
fixupParserResult(T *D) {
if (movedToTopLevel())
hoistDecl(D);
return ParserResult<T>(D);
}
template <typename T>
ParserResult<T>
fixupParserResult(ParserStatus Status, T *D) {
if (movedToTopLevel())
hoistDecl(D);
return makeParserResult(Status, D);
}
// The destructor doesn't need to do anything, the CC's destructor will
// pop the context if we set it.
~DebuggerContextChange () {}
private:
DebuggerClient *getDebuggerClient() {
ModuleDecl *M = P.CurDeclContext->getParentModule();
return M->getDebugClient();
}
bool inDebuggerContext() {
if (!P.Context.LangOpts.DebuggerSupport)
return false;
if (!P.CurDeclContext)
return false;
auto *func = dyn_cast<FuncDecl>(P.CurDeclContext);
if (!func)
return false;
if (!func->getAttrs().hasAttribute<LLDBDebuggerFunctionAttr>())
return false;
return true;
}
void switchContext() {
SF = P.CurDeclContext->getParentSourceFile();
CC.emplace(P, SF);
}
template<typename T>
void hoistDecl(T *D) {
D->setHoisted();
SF->addHoistedDecl(D);
getDebuggerClient()->didGlobalize(D);
}
};
} // end anonymous namespace
extern "C" void parseTopLevelSwift(const char *buffer,
void *declContext,
void *astContext,
void *outputContext,
void (*)(void *, void *));
#if SWIFT_BUILD_SWIFT_SYNTAX
static void appendToVector(void *declPtr, void *vecPtr) {
auto vec = static_cast<SmallVectorImpl<ASTNode> *>(vecPtr);
auto decl = static_cast<Decl *>(declPtr);
vec->push_back(decl);
}
#endif
/// Main entrypoint for the parser.
///
/// \verbatim
/// top-level:
/// stmt-brace-item*
/// decl-sil [[only in SIL mode]
/// decl-sil-stage [[only in SIL mode]
/// \endverbatim
void Parser::parseTopLevelItems(SmallVectorImpl<ASTNode> &items) {
#if SWIFT_BUILD_SWIFT_SYNTAX
llvm::Optional<DiagnosticTransaction> existingParsingTransaction;
parseSourceFileViaASTGen(items, existingParsingTransaction);
#endif
// Prime the lexer.
if (Tok.is(tok::NUM_TOKENS))
consumeTokenWithoutFeedingReceiver();
// Parse the body of the file.
while (!Tok.is(tok::eof)) {
// If we run into a SIL decl, skip over until the next Swift decl. We need
// to delay parsing these, as SIL parsing currently requires type checking
// Swift decls.
if (isStartOfSILDecl()) {
assert(!isStartOfSwiftDecl() && "Start of both a Swift and SIL decl?");
skipSILUntilSwiftDecl();
continue;
}
// Figure out how to parse the items in this source file.
BraceItemListKind braceItemListKind;
switch (SF.Kind) {
case SourceFileKind::Main:
braceItemListKind = BraceItemListKind::TopLevelCode;
break;
case SourceFileKind::Library:
case SourceFileKind::Interface:
case SourceFileKind::SIL:
braceItemListKind = BraceItemListKind::TopLevelLibrary;
break;
case SourceFileKind::MacroExpansion:
case SourceFileKind::DefaultArgument:
braceItemListKind = BraceItemListKind::MacroExpansion;
break;
}
parseBraceItems(items, braceItemListKind);
// In the case of a catastrophic parse error, consume any trailing
// #else, #elseif, or #endif and move on to the next statement or
// declaration block.
if (Tok.is(tok::pound_else) || Tok.is(tok::pound_elseif) ||
Tok.is(tok::pound_endif)) {
diagnose(Tok.getLoc(),
diag::unexpected_conditional_compilation_block_terminator);
consumeToken();
}
}
#if SWIFT_BUILD_SWIFT_SYNTAX
if (existingParsingTransaction)
existingParsingTransaction->abort();
using ParsingFlags = SourceFile::ParsingFlags;
const auto parsingOpts = SF.getParsingOptions();
// If we don't need to validate anything, we're done.
if (!parsingOpts.contains(ParsingFlags::RoundTrip) &&
!parsingOpts.contains(ParsingFlags::ValidateNewParserDiagnostics)) {
return;
}
auto *exportedSourceFile = SF.getExportedSourceFile();
if (!exportedSourceFile)
return;
// Perform round-trip and/or validation checking.
if (parsingOpts.contains(ParsingFlags::RoundTrip) &&
swift_ASTGen_roundTripCheck(exportedSourceFile)) {
SourceLoc loc;
if (auto bufferID = SF.getBufferID()) {
loc = Context.SourceMgr.getLocForBufferStart(*bufferID);
}
diagnose(loc, diag::parser_round_trip_error);
return;
}
if (parsingOpts.contains(ParsingFlags::ValidateNewParserDiagnostics) &&
!Context.Diags.hadAnyError()) {
auto hadSyntaxError = swift_ASTGen_emitParserDiagnostics(
&Context.Diags, exportedSourceFile,
/*emitOnlyErrors=*/true,
/*downgradePlaceholderErrorsToWarnings=*/
Context.LangOpts.Playground ||
Context.LangOpts.WarnOnEditorPlaceholder);
if (hadSyntaxError) {
// We might have emitted warnings in the C++ parser but no errors, in
// which case we still have `hadAnyError() == false`. To avoid
// emitting the same warnings from SwiftParser, only emit errors from
// SwiftParser
SourceLoc loc;
if (auto bufferID = SF.getBufferID()) {
loc = Context.SourceMgr.getLocForBufferStart(*bufferID);
}
diagnose(loc, diag::parser_new_parser_errors);
}
}
#endif
}
void *ExportedSourceFileRequest::evaluate(Evaluator &evaluator,
const SourceFile *SF) const {
#if SWIFT_BUILD_SWIFT_SYNTAX
// The SwiftSyntax parser doesn't (yet?) handle SIL.
if (SF->Kind == SourceFileKind::SIL)
return nullptr;
auto &ctx = SF->getASTContext();
auto &SM = ctx.SourceMgr;
auto bufferID = SF->getBufferID();
if (!bufferID)
return nullptr;
StringRef contents = SM.extractText(SM.getRangeForBuffer(*bufferID));
// Parse the source file.
auto exportedSourceFile = swift_ASTGen_parseSourceFile(
contents.begin(), contents.size(),
SF->getParentModule()->getName().str().str().c_str(),
SF->getFilename().str().c_str(), &ctx);
ctx.addCleanup([exportedSourceFile] {
swift_ASTGen_destroySourceFile(exportedSourceFile);
});
return exportedSourceFile;
#else
return nullptr;
#endif
}
void Parser::parseSourceFileViaASTGen(
SmallVectorImpl<ASTNode> &items,
llvm::Optional<DiagnosticTransaction> &transaction,
bool suppressDiagnostics) {
#if SWIFT_BUILD_SWIFT_SYNTAX
const auto &langOpts = Context.LangOpts;
// We only need to do parsing if we either have ASTGen enabled, or want the
// new parser diagnostics.
auto needToParse = [&]() {
if (langOpts.hasFeature(Feature::ParserASTGen))
return true;
if (!suppressDiagnostics &&
langOpts.hasFeature(Feature::ParserDiagnostics)) {
return true;
}
return false;
}();
if (!needToParse)
return;
auto *exportedSourceFile = SF.getExportedSourceFile();
if (!exportedSourceFile)
return;
// If we're supposed to emit diagnostics from the parser, do so now.
if (!suppressDiagnostics) {
auto hadSyntaxError = swift_ASTGen_emitParserDiagnostics(
&Context.Diags, exportedSourceFile, /*emitOnlyErrors=*/false,
/*downgradePlaceholderErrorsToWarnings=*/langOpts.Playground ||
langOpts.WarnOnEditorPlaceholder);
if (hadSyntaxError && Context.Diags.hadAnyError() &&
!langOpts.hasFeature(Feature::ParserASTGen)) {
// Errors were emitted, and we're still using the C++ parser, so
// disable diagnostics from the C++ parser.
transaction.emplace(Context.Diags);
}
}
// If we want to do ASTGen, do so now.
if (langOpts.hasFeature(Feature::ParserASTGen)) {
this->IsForASTGen = true;
swift_ASTGen_buildTopLevelASTNodes(&Diags, exportedSourceFile,
CurDeclContext, Context, *this, &items,
appendToVector);
// Spin the C++ parser to the end; we won't be using it.
while (!Tok.is(tok::eof)) {
consumeToken();
}
}
#endif
}
bool Parser::parseTopLevelSIL() {
assert(SIL && isInSILMode());
// Prime the lexer.
if (Tok.is(tok::NUM_TOKENS))
consumeTokenWithoutFeedingReceiver();
auto skipToNextSILDecl = [&]() {
while (!Tok.is(tok::eof) && !isStartOfSILDecl())
skipSingle();
};
auto hadError = false;
while (!Tok.is(tok::eof)) {
// If we run into a Swift decl, skip over until we find the next SIL decl.
if (isStartOfSwiftDecl()) {
assert(!isStartOfSILDecl() && "Start of both a Swift and SIL decl?");
skipToNextSILDecl();
continue;
}
switch (Tok.getKind()) {
#define CASE_SIL(KW, NAME) \
case tok::kw_##KW: { \
/* If we failed to parse a SIL decl, move onto the next SIL decl to \
better help recovery. */ \
if (SIL->parse##NAME(*this)) { \
Lexer::SILBodyRAII sbr(*L); \
skipToNextSILDecl(); \
hadError = true; \
} \
break; \
}
CASE_SIL(sil, DeclSIL)
CASE_SIL(sil_stage, DeclSILStage)
CASE_SIL(sil_vtable, SILVTable)
CASE_SIL(sil_moveonlydeinit, SILMoveOnlyDeinit)
CASE_SIL(sil_global, SILGlobal)
CASE_SIL(sil_witness_table, SILWitnessTable)
CASE_SIL(sil_default_witness_table, SILDefaultWitnessTable)
CASE_SIL(sil_differentiability_witness, SILDifferentiabilityWitness)
CASE_SIL(sil_coverage_map, SILCoverageMap)
CASE_SIL(sil_property, SILProperty)
CASE_SIL(sil_scope, SILScope)
#undef CASE_SIL
default:
// If we reached here, we have something malformed that isn't a Swift decl
// or a SIL decl. Emit an error and skip ahead to the next SIL decl.
diagnose(Tok, diag::expected_sil_keyword);
skipToNextSILDecl();
hadError = true;
break;
}
}
return hadError;
}
ParserResult<AvailableAttr> Parser::parseExtendedAvailabilitySpecList(
SourceLoc AtLoc, SourceLoc AttrLoc, StringRef AttrName) {
// Check 'Tok', return false if ':' or '=' cannot be found.
// Complain if '=' is found and suggest replacing it with ": ".
auto findAttrValueDelimiter = [&]() -> bool {
if (!Tok.is(tok::colon)) {
if (!Tok.is(tok::equal))
return false;
diagnose(Tok.getLoc(), diag::replace_equal_with_colon_for_value)
.fixItReplace(Tok.getLoc(), ": ");
}
return true;
};
struct VersionArg {
llvm::VersionTuple Version;
SourceRange Range;
SourceLoc DelimiterLoc;
bool empty() const {
return Version.empty();
}
};
StringRef Platform = Tok.getText();
SourceLoc PlatformLoc = Tok.getLoc();
StringRef Message, Renamed;
VersionArg Introduced, Deprecated, Obsoleted;
auto PlatformAgnostic = PlatformAgnosticAvailabilityKind::None;
bool HasUpcomingEntry = false;
{
consumeToken();
if (consumeIf(tok::comma)) {
HasUpcomingEntry = true;
}
}
bool AnyAnnotations = false;
bool AnyArgumentInvalid = false;
int ParamIndex = 0;
while (HasUpcomingEntry) {
auto ArgumentLoc = Tok.getLoc();
AnyAnnotations = true;
StringRef ArgumentKindStr = Tok.getText();
++ParamIndex;
enum {
IsMessage,
IsRenamed,
IsIntroduced,
IsDeprecated,
IsObsoleted,
IsUnavailable,
IsNoAsync,
IsInvalid
} ArgumentKind = IsInvalid;
if (Tok.is(tok::identifier)) {
ArgumentKind = llvm::StringSwitch<decltype(ArgumentKind)>(ArgumentKindStr)
.Case("message", IsMessage)
.Case("renamed", IsRenamed)
.Case("introduced", IsIntroduced)
.Case("deprecated", IsDeprecated)
.Case("obsoleted", IsObsoleted)
.Case("unavailable", IsUnavailable)
.Case("noasync", IsNoAsync)
.Default(IsInvalid);
}
auto platformAgnosticKindToStr = [](PlatformAgnosticAvailabilityKind kind) {
switch (kind) {
case PlatformAgnosticAvailabilityKind::None:
return "none";
case PlatformAgnosticAvailabilityKind::Deprecated:
return "deprecated";
case PlatformAgnosticAvailabilityKind::Unavailable:
return "unavailable";
case PlatformAgnosticAvailabilityKind::NoAsync:
return "noasync";
// These are possible platform agnostic availability kinds.
// I'm not sure what their spellings are at the moment, so I'm
// crashing instead of handling them.
case PlatformAgnosticAvailabilityKind::UnavailableInSwift:
case PlatformAgnosticAvailabilityKind::SwiftVersionSpecific:
case PlatformAgnosticAvailabilityKind::PackageDescriptionVersionSpecific:
llvm_unreachable("Unknown availability kind for parser");
}
};
if (ArgumentKind == IsInvalid) {
diagnose(ArgumentLoc, diag::attr_availability_expected_option, AttrName)
.highlight(SourceRange(ArgumentLoc));
if (Tok.is(tok::code_complete) && CodeCompletionCallbacks) {
CodeCompletionCallbacks->completeDeclAttrParam(
CustomSyntaxAttributeKind::Available, ParamIndex,
/*HasLabel=*/false);
consumeToken(tok::code_complete);
} else {
consumeIf(tok::identifier);
}
return nullptr;
}
consumeToken();
auto diagnoseDuplicate = [&](bool WasEmpty) {
if (!WasEmpty) {
diagnose(ArgumentLoc, diag::attr_availability_invalid_duplicate,
ArgumentKindStr);
}
};
switch (ArgumentKind) {
case IsMessage:
case IsRenamed: {
// Items with string arguments.
if (findAttrValueDelimiter()) {
consumeToken();
} else {
diagnose(Tok, diag::attr_availability_expected_equal, AttrName,
ArgumentKindStr);
AnyArgumentInvalid = true;
if (peekToken().isAny(tok::r_paren, tok::comma))
consumeToken();
break;
}
if (!Tok.is(tok::string_literal)) {
diagnose(AttrLoc, diag::attr_expected_string_literal, AttrName);
AnyArgumentInvalid = true;
if (peekToken().isAny(tok::r_paren, tok::comma))
consumeToken();
break;
}
auto Value = getStringLiteralIfNotInterpolated(
AttrLoc, ("'" + ArgumentKindStr + "'").str(),
/*AllowMultiline=*/true);
consumeToken();
if (!Value) {
AnyArgumentInvalid = true;
break;
}
if (ArgumentKind == IsMessage) {
diagnoseDuplicate(Message.empty());
Message = Value.value();
} else {
ParsedDeclName parsedName = parseDeclName(Value.value());
if (!parsedName) {
diagnose(AttrLoc, diag::attr_availability_invalid_renamed, AttrName);
AnyArgumentInvalid = true;
break;
}
diagnoseDuplicate(Renamed.empty());
Renamed = Value.value();
}
break;
}
case IsDeprecated:
if (!findAttrValueDelimiter()) {
if (PlatformAgnostic != PlatformAgnosticAvailabilityKind::None) {
diagnose(Tok, diag::attr_availability_multiple_kinds, AttrName,
"deprecated", platformAgnosticKindToStr(PlatformAgnostic));
}
PlatformAgnostic = PlatformAgnosticAvailabilityKind::Deprecated;
break;
}
LLVM_FALLTHROUGH;
case IsIntroduced:
case IsObsoleted: {
// Items with version arguments.
SourceLoc DelimiterLoc;
if (findAttrValueDelimiter()) {
DelimiterLoc = Tok.getLoc();
consumeToken();
} else {
diagnose(Tok, diag::attr_availability_expected_equal, AttrName,
ArgumentKindStr);
AnyArgumentInvalid = true;
if (peekToken().isAny(tok::r_paren, tok::comma))
consumeToken();
break;
}
auto &VerArg =
(ArgumentKind == IsIntroduced)
? Introduced
: (ArgumentKind == IsDeprecated) ? Deprecated : Obsoleted;
bool VerArgWasEmpty = VerArg.empty();
if (parseVersionTuple(
VerArg.Version, VerArg.Range,
Diagnostic(diag::attr_availability_expected_version, AttrName))) {
AnyArgumentInvalid = true;
if (peekToken().isAny(tok::r_paren, tok::comma))
consumeToken();
}
VerArg.DelimiterLoc = DelimiterLoc;
diagnoseDuplicate(VerArgWasEmpty);
break;
}
case IsUnavailable:
if (PlatformAgnostic != PlatformAgnosticAvailabilityKind::None) {
diagnose(Tok, diag::attr_availability_multiple_kinds, AttrName,
"unavailable", platformAgnosticKindToStr(PlatformAgnostic));
}
PlatformAgnostic = PlatformAgnosticAvailabilityKind::Unavailable;
break;
case IsNoAsync:
if (PlatformAgnostic != PlatformAgnosticAvailabilityKind::None) {
diagnose(Tok, diag::attr_availability_multiple_kinds, AttrName,
"noasync", platformAgnosticKindToStr(PlatformAgnostic));
}
PlatformAgnostic = PlatformAgnosticAvailabilityKind::NoAsync;
break;
case IsInvalid:
llvm_unreachable("handled above");
}
// Parse the trailing comma
if (consumeIf(tok::comma)) {
HasUpcomingEntry = true;
} else {
HasUpcomingEntry = false;
}
}
if (!AnyAnnotations) {
diagnose(Tok.getLoc(), diag::attr_expected_comma, AttrName,
/*isDeclModifier*/ false);
}
auto PlatformKind = platformFromString(Platform);
// Treat 'swift' as a valid version-qualifying token, when
// at least some versions were mentioned and no other
// platform-agnostic availability spec has been provided.
bool SomeVersion = (!Introduced.empty() ||
!Deprecated.empty() ||
!Obsoleted.empty());
if (!PlatformKind.has_value() &&
(Platform == "swift" || Platform == "_PackageDescription")) {
if (PlatformAgnostic == PlatformAgnosticAvailabilityKind::Deprecated) {
diagnose(AttrLoc,
diag::attr_availability_platform_agnostic_expected_deprecated_version,
AttrName, Platform);
return nullptr;
}
if (PlatformAgnostic == PlatformAgnosticAvailabilityKind::Unavailable) {
diagnose(AttrLoc, diag::attr_availability_platform_agnostic_infeasible_option,
"unavailable", AttrName, Platform);
return nullptr;
}
assert(PlatformAgnostic == PlatformAgnosticAvailabilityKind::None);
if (!SomeVersion) {
diagnose(AttrLoc, diag::attr_availability_platform_agnostic_expected_option,
AttrName, Platform);
return nullptr;
}
PlatformKind = PlatformKind::none;
PlatformAgnostic = (Platform == "swift") ?
PlatformAgnosticAvailabilityKind::SwiftVersionSpecific :
PlatformAgnosticAvailabilityKind::PackageDescriptionVersionSpecific;
}
if (AnyArgumentInvalid)
return nullptr;
if (!PlatformKind.has_value()) {
if (auto CorrectedPlatform = closestCorrectedPlatformString(Platform)) {
diagnose(PlatformLoc, diag::attr_availability_suggest_platform, Platform,
AttrName, *CorrectedPlatform)
.fixItReplace(SourceRange(PlatformLoc), *CorrectedPlatform);
} else {
diagnose(AttrLoc, diag::attr_availability_unknown_platform, Platform,
AttrName);
}
return nullptr;
}
// Warn if any version is specified for non-specific platform '*'.
if (Platform == "*" && SomeVersion) {
auto diag = diagnose(AttrLoc,
diag::attr_availability_nonspecific_platform_unexpected_version,
AttrName);
if (!Introduced.empty())
diag.fixItRemove(SourceRange(Introduced.DelimiterLoc,
Introduced.Range.End));
if (!Deprecated.empty())
diag.fixItRemove(SourceRange(Deprecated.DelimiterLoc,
Deprecated.Range.End));
if (!Obsoleted.empty())
diag.fixItRemove(SourceRange(Obsoleted.DelimiterLoc,
Obsoleted.Range.End));
return nullptr;
}
if (PlatformKind) {
if (!Introduced.empty())
Introduced.Version =
canonicalizePlatformVersion(*PlatformKind, Introduced.Version);
if (!Deprecated.empty())
Deprecated.Version =
canonicalizePlatformVersion(*PlatformKind, Deprecated.Version);
if (!Obsoleted.empty())
Obsoleted.Version =
canonicalizePlatformVersion(*PlatformKind, Obsoleted.Version);
}
auto Attr = new (Context)
AvailableAttr(AtLoc, SourceRange(AttrLoc, Tok.getLoc()),
PlatformKind.value(),
Message, Renamed, /*RenameDecl=*/nullptr,
Introduced.Version, Introduced.Range,
Deprecated.Version, Deprecated.Range,
Obsoleted.Version, Obsoleted.Range,
PlatformAgnostic,
/*Implicit=*/false,
AttrName == SPI_AVAILABLE_ATTRNAME);
return makeParserResult(Attr);
}
bool Parser::parseSpecializeAttributeArguments(
swift::tok ClosingBrace, bool &DiscardAttribute,
llvm::Optional<bool> &Exported,
llvm::Optional<SpecializeAttr::SpecializationKind> &Kind,
swift::TrailingWhereClause *&TrailingWhereClause,
DeclNameRef &targetFunction, AvailabilityContext *SILAvailability,
SmallVectorImpl<Identifier> &spiGroups,
SmallVectorImpl<AvailableAttr *> &availableAttrs,
size_t &typeErasedParamsCount,
llvm::function_ref<bool(Parser &)> parseSILTargetName,
llvm::function_ref<bool(Parser &)> parseSILSIPModule) {
bool isSIL = SILAvailability != nullptr;
typeErasedParamsCount = 0;
// Parse optional "exported" and "kind" labeled parameters.
while (!Tok.is(tok::kw_where)) {
bool isAvailability = false;
if (Tok.is(tok::identifier)) {
auto ParamLabel = Tok.getText();
if (ParamLabel != "exported" && ParamLabel != "kind" &&
ParamLabel != "target" && ParamLabel != "spi" &&
ParamLabel != "spiModule" && ParamLabel != "availability" &&
(!isSIL || ParamLabel != "available")) {
diagnose(Tok.getLoc(), diag::attr_specialize_unknown_parameter_name,
ParamLabel);
}
auto AtLoc = consumeToken();
if (!consumeIf(tok::colon)) {
diagnose(Tok.getLoc(), diag::attr_specialize_missing_colon, ParamLabel);
skipUntil(tok::comma, tok::kw_where);
if (Tok.is(ClosingBrace))
break;
if (Tok.is(tok::kw_where)) {
continue;
}
if (Tok.is(tok::comma)) {
consumeToken();
continue;
}
DiscardAttribute = true;
return false;
}
if ((ParamLabel == "exported" && Exported.has_value()) ||
(ParamLabel == "kind" && Kind.has_value()) ||
(ParamLabel == "spi" && !spiGroups.empty())) {
diagnose(Tok.getLoc(), diag::attr_specialize_parameter_already_defined,
ParamLabel);
}
if (ParamLabel == "available") {
SourceRange range;
llvm::VersionTuple version;
if (parseVersionTuple(version, range,
diag::sil_availability_expected_version))
return false;
*SILAvailability = AvailabilityContext(VersionRange::allGTE(version));
}
if (ParamLabel == "availability") {
SourceRange attrRange;
auto Loc = Tok.getLoc();
bool shouldDiscardAvailabilityAttr = false;
isAvailability = true;
if (!parseAvailability(true, ParamLabel, shouldDiscardAvailabilityAttr,
attrRange, AtLoc, Loc, [&](AvailableAttr *attr) {
availableAttrs.push_back(attr);
}))
return false;
}
if (ParamLabel == "exported") {
bool isTrue = consumeIf(tok::kw_true);
bool isFalse = consumeIf(tok::kw_false);
if (!isTrue && !isFalse) {
diagnose(Tok.getLoc(), diag::attr_specialize_expected_bool_value);
skipUntil(tok::comma, tok::kw_where);
if (Tok.is(ClosingBrace))
break;
if (Tok.is(tok::kw_where)) {
continue;
}
if (Tok.is(tok::comma)) {
consumeToken();
continue;
}
DiscardAttribute = true;
return false;
}
if (ParamLabel == "exported") {
Exported = isTrue;
}
}
if (ParamLabel == "kind") {
SourceLoc paramValueLoc;
if (Tok.is(tok::identifier)) {
if (Tok.getText() == "partial") {
Kind = SpecializeAttr::SpecializationKind::Partial;
} else if (Tok.getText() == "full") {
Kind = SpecializeAttr::SpecializationKind::Full;
} else {
diagnose(Tok.getLoc(),
diag::attr_specialize_expected_partial_or_full);
}
consumeToken();
} else if (consumeIf(tok::kw_true, paramValueLoc) ||
consumeIf(tok::kw_false, paramValueLoc)) {
diagnose(paramValueLoc,
diag::attr_specialize_expected_partial_or_full);
}
}
if (ParamLabel == "target") {
if (!parseSILTargetName(*this)) {
DeclNameLoc loc;
targetFunction = parseDeclNameRef(
loc, diag::attr_specialize_expected_function,
DeclNameFlag::AllowZeroArgCompoundNames |
DeclNameFlag::AllowKeywordsUsingSpecialNames |
DeclNameFlag::AllowOperators |
DeclNameFlag::AllowLowercaseAndUppercaseSelf);
}
}
if (ParamLabel == "spiModule") {
if (!parseSILSIPModule(*this)) {
diagnose(Tok.getLoc(), diag::attr_specialize_unknown_parameter_name,
ParamLabel);
return false;
}
}
if (ParamLabel == "spi") {
if (!Tok.isIdentifierOrUnderscore()) {
diagnose(Tok.getLoc(), diag::attr_specialize_expected_spi_name);
consumeToken();
return false;
}
auto text = Tok.getText();
spiGroups.push_back(Context.getIdentifier(text));
consumeToken();
}
if (!isAvailability && !consumeIf(tok::comma)) {
diagnose(Tok.getLoc(), diag::attr_specialize_missing_comma);
skipUntil(tok::comma, tok::kw_where);
if (Tok.is(ClosingBrace))
break;
if (Tok.is(tok::kw_where)) {
continue;
}
if (Tok.is(tok::comma)) {
consumeToken();
continue;
}
DiscardAttribute = true;
return false;
}
continue;
}
diagnose(Tok.getLoc(),
diag::attr_specialize_missing_parameter_label_or_where_clause);
DiscardAttribute = true;
return false;
};
// Parse the where clause.
if (Tok.is(tok::kw_where)) {
SourceLoc whereLoc, endLoc;
SmallVector<RequirementRepr, 4> requirements;
parseGenericWhereClause(whereLoc, endLoc, requirements,
/* AllowLayoutConstraints */ true);
if (Context.LangOpts.hasFeature(Feature::LayoutPrespecialization)) {
for (auto req : requirements) {
if (req.getKind() == RequirementReprKind::LayoutConstraint) {
if (auto *attributedTy = dyn_cast<AttributedTypeRepr>(req.getSubjectRepr())) {
if (attributedTy->has(TypeAttrKind::NoMetadata)) {
typeErasedParamsCount += 1;
}
}
}
}
}
TrailingWhereClause =
TrailingWhereClause::create(Context, whereLoc, endLoc, requirements);
}
return true;
}
bool Parser::parseAvailability(
bool parseAsPartOfSpecializeAttr, StringRef AttrName,
bool &DiscardAttribute, SourceRange &attrRange, SourceLoc AtLoc,
SourceLoc Loc, llvm::function_ref<void(AvailableAttr *)> addAttribute) {
// platform:
// *
// identifier
if (!Tok.is(tok::identifier) &&
!(Tok.isAnyOperator() && Tok.getText() == "*")) {
if (Tok.is(tok::code_complete) && CodeCompletionCallbacks) {
CodeCompletionCallbacks->completeDeclAttrParam(
CustomSyntaxAttributeKind::Available, 0, /*HasLabel=*/false);
consumeToken(tok::code_complete);
}
diagnose(Tok.getLoc(), diag::attr_availability_platform, AttrName)
.highlight(SourceRange(Tok.getLoc()));
consumeIf(tok::r_paren);
return false;
}
// Delay processing of platform until later, after we have
// parsed more of the attribute.
StringRef Platform = Tok.getText();
if (Platform != "*" &&
(peekToken().isAny(tok::integer_literal, tok::floating_literal) ||
peekAvailabilityMacroName())) {
// We have the short form of available: @available(iOS 8.0.1, *)
SmallVector<AvailabilitySpec *, 5> Specs;
ParserStatus Status =
parseAvailabilitySpecList(Specs, AvailabilitySpecSource::Available);
if (Status.isErrorOrHasCompletion())
return false;
auto availTerminator =
parseAsPartOfSpecializeAttr ? tok::semi : tok::r_paren;
if (!consumeIf(availTerminator)) {
auto diagnostic = parseAsPartOfSpecializeAttr
? diag::attr_expected_semi
: diag::attr_expected_rparen;
diagnose(Tok.getLoc(), diagnostic, AttrName, parseAsPartOfSpecializeAttr);
return false;
}
attrRange = SourceRange(Loc, PreviousLoc);