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llvm / clang / 92bf0539a1e2abe2e328e15d2c9e685d696fd378 / . / lib / Parse / Parser.cpp
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//===--- Parser.cpp - C Language Family Parser ----------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the Parser interfaces.
//
//===----------------------------------------------------------------------===//
#include "clang/Parse/Parser.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/Parse/ParseDiagnostic.h"
#include "clang/Parse/RAIIObjectsForParser.h"
#include "clang/Sema/DeclSpec.h"
#include "clang/Sema/ParsedTemplate.h"
#include "clang/Sema/Scope.h"
#include "llvm/Support/Path.h"
using namespace clang;
namespace {
/// A comment handler that passes comments found by the preprocessor
/// to the parser action.
class ActionCommentHandler : public CommentHandler {
Sema &S;
public:
explicit ActionCommentHandler(Sema &S) : S(S) { }
bool HandleComment(Preprocessor &PP, SourceRange Comment) override {
S.ActOnComment(Comment);
return false;
}
};
} // end anonymous namespace
IdentifierInfo *Parser::getSEHExceptKeyword() {
// __except is accepted as a (contextual) keyword
if (!Ident__except && (getLangOpts().MicrosoftExt || getLangOpts().Borland))
Ident__except = PP.getIdentifierInfo("__except");
return Ident__except;
}
Parser::Parser(Preprocessor &pp, Sema &actions, bool skipFunctionBodies)
: PP(pp), Actions(actions), Diags(PP.getDiagnostics()),
GreaterThanIsOperator(true), ColonIsSacred(false),
InMessageExpression(false), TemplateParameterDepth(0),
ParsingInObjCContainer(false) {
SkipFunctionBodies = pp.isCodeCompletionEnabled() || skipFunctionBodies;
Tok.startToken();
Tok.setKind(tok::eof);
Actions.CurScope = nullptr;
NumCachedScopes = 0;
CurParsedObjCImpl = nullptr;
// Add #pragma handlers. These are removed and destroyed in the
// destructor.
initializePragmaHandlers();
CommentSemaHandler.reset(new ActionCommentHandler(actions));
PP.addCommentHandler(CommentSemaHandler.get());
PP.setCodeCompletionHandler(*this);
}
DiagnosticBuilder Parser::Diag(SourceLocation Loc, unsigned DiagID) {
return Diags.Report(Loc, DiagID);
}
DiagnosticBuilder Parser::Diag(const Token &Tok, unsigned DiagID) {
return Diag(Tok.getLocation(), DiagID);
}
/// Emits a diagnostic suggesting parentheses surrounding a
/// given range.
///
/// \param Loc The location where we'll emit the diagnostic.
/// \param DK The kind of diagnostic to emit.
/// \param ParenRange Source range enclosing code that should be parenthesized.
void Parser::SuggestParentheses(SourceLocation Loc, unsigned DK,
SourceRange ParenRange) {
SourceLocation EndLoc = PP.getLocForEndOfToken(ParenRange.getEnd());
if (!ParenRange.getEnd().isFileID() || EndLoc.isInvalid()) {
// We can't display the parentheses, so just dig the
// warning/error and return.
Diag(Loc, DK);
return;
}
Diag(Loc, DK)
<< FixItHint::CreateInsertion(ParenRange.getBegin(), "(")
<< FixItHint::CreateInsertion(EndLoc, ")");
}
static bool IsCommonTypo(tok::TokenKind ExpectedTok, const Token &Tok) {
switch (ExpectedTok) {
case tok::semi:
return Tok.is(tok::colon) || Tok.is(tok::comma); // : or , for ;
default: return false;
}
}
bool Parser::ExpectAndConsume(tok::TokenKind ExpectedTok, unsigned DiagID,
StringRef Msg) {
if (Tok.is(ExpectedTok) || Tok.is(tok::code_completion)) {
ConsumeAnyToken();
return false;
}
// Detect common single-character typos and resume.
if (IsCommonTypo(ExpectedTok, Tok)) {
SourceLocation Loc = Tok.getLocation();
{
DiagnosticBuilder DB = Diag(Loc, DiagID);
DB << FixItHint::CreateReplacement(
SourceRange(Loc), tok::getPunctuatorSpelling(ExpectedTok));
if (DiagID == diag::err_expected)
DB << ExpectedTok;
else if (DiagID == diag::err_expected_after)
DB << Msg << ExpectedTok;
else
DB << Msg;
}
// Pretend there wasn't a problem.
ConsumeAnyToken();
return false;
}
SourceLocation EndLoc = PP.getLocForEndOfToken(PrevTokLocation);
const char *Spelling = nullptr;
if (EndLoc.isValid())
Spelling = tok::getPunctuatorSpelling(ExpectedTok);
DiagnosticBuilder DB =
Spelling
? Diag(EndLoc, DiagID) << FixItHint::CreateInsertion(EndLoc, Spelling)
: Diag(Tok, DiagID);
if (DiagID == diag::err_expected)
DB << ExpectedTok;
else if (DiagID == diag::err_expected_after)
DB << Msg << ExpectedTok;
else
DB << Msg;
return true;
}
bool Parser::ExpectAndConsumeSemi(unsigned DiagID) {
if (TryConsumeToken(tok::semi))
return false;
if (Tok.is(tok::code_completion)) {
handleUnexpectedCodeCompletionToken();
return false;
}
if ((Tok.is(tok::r_paren) || Tok.is(tok::r_square)) &&
NextToken().is(tok::semi)) {
Diag(Tok, diag::err_extraneous_token_before_semi)
<< PP.getSpelling(Tok)
<< FixItHint::CreateRemoval(Tok.getLocation());
ConsumeAnyToken(); // The ')' or ']'.
ConsumeToken(); // The ';'.
return false;
}
return ExpectAndConsume(tok::semi, DiagID);
}
void Parser::ConsumeExtraSemi(ExtraSemiKind Kind, DeclSpec::TST TST) {
if (!Tok.is(tok::semi)) return;
bool HadMultipleSemis = false;
SourceLocation StartLoc = Tok.getLocation();
SourceLocation EndLoc = Tok.getLocation();
ConsumeToken();
while ((Tok.is(tok::semi) && !Tok.isAtStartOfLine())) {
HadMultipleSemis = true;
EndLoc = Tok.getLocation();
ConsumeToken();
}
// C++11 allows extra semicolons at namespace scope, but not in any of the
// other contexts.
if (Kind == OutsideFunction && getLangOpts().CPlusPlus) {
if (getLangOpts().CPlusPlus11)
Diag(StartLoc, diag::warn_cxx98_compat_top_level_semi)
<< FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
else
Diag(StartLoc, diag::ext_extra_semi_cxx11)
<< FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
return;
}
if (Kind != AfterMemberFunctionDefinition || HadMultipleSemis)
Diag(StartLoc, diag::ext_extra_semi)
<< Kind << DeclSpec::getSpecifierName(TST,
Actions.getASTContext().getPrintingPolicy())
<< FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
else
// A single semicolon is valid after a member function definition.
Diag(StartLoc, diag::warn_extra_semi_after_mem_fn_def)
<< FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
}
bool Parser::expectIdentifier() {
if (Tok.is(tok::identifier))
return false;
if (const auto *II = Tok.getIdentifierInfo()) {
if (II->isCPlusPlusKeyword(getLangOpts())) {
Diag(Tok, diag::err_expected_token_instead_of_objcxx_keyword)
<< tok::identifier << Tok.getIdentifierInfo();
// Objective-C++: Recover by treating this keyword as a valid identifier.
return false;
}
}
Diag(Tok, diag::err_expected) << tok::identifier;
return true;
}
//===----------------------------------------------------------------------===//
// Error recovery.
//===----------------------------------------------------------------------===//
static bool HasFlagsSet(Parser::SkipUntilFlags L, Parser::SkipUntilFlags R) {
return (static_cast<unsigned>(L) & static_cast<unsigned>(R)) != 0;
}
/// SkipUntil - Read tokens until we get to the specified token, then consume
/// it (unless no flag StopBeforeMatch). Because we cannot guarantee that the
/// token will ever occur, this skips to the next token, or to some likely
/// good stopping point. If StopAtSemi is true, skipping will stop at a ';'
/// character.
///
/// If SkipUntil finds the specified token, it returns true, otherwise it
/// returns false.
bool Parser::SkipUntil(ArrayRef<tok::TokenKind> Toks, SkipUntilFlags Flags) {
// We always want this function to skip at least one token if the first token
// isn't T and if not at EOF.
bool isFirstTokenSkipped = true;
while (1) {
// If we found one of the tokens, stop and return true.
for (unsigned i = 0, NumToks = Toks.size(); i != NumToks; ++i) {
if (Tok.is(Toks[i])) {
if (HasFlagsSet(Flags, StopBeforeMatch)) {
// Noop, don't consume the token.
} else {
ConsumeAnyToken();
}
return true;
}
}
// Important special case: The caller has given up and just wants us to
// skip the rest of the file. Do this without recursing, since we can
// get here precisely because the caller detected too much recursion.
if (Toks.size() == 1 && Toks[0] == tok::eof &&
!HasFlagsSet(Flags, StopAtSemi) &&
!HasFlagsSet(Flags, StopAtCodeCompletion)) {
while (Tok.isNot(tok::eof))
ConsumeAnyToken();
return true;
}
switch (Tok.getKind()) {
case tok::eof:
// Ran out of tokens.
return false;
case tok::annot_pragma_openmp:
case tok::annot_pragma_openmp_end:
// Stop before an OpenMP pragma boundary.
case tok::annot_module_begin:
case tok::annot_module_end:
case tok::annot_module_include:
// Stop before we change submodules. They generally indicate a "good"
// place to pick up parsing again (except in the special case where
// we're trying to skip to EOF).
return false;
case tok::code_completion:
if (!HasFlagsSet(Flags, StopAtCodeCompletion))
handleUnexpectedCodeCompletionToken();
return false;
case tok::l_paren:
// Recursively skip properly-nested parens.
ConsumeParen();
if (HasFlagsSet(Flags, StopAtCodeCompletion))
SkipUntil(tok::r_paren, StopAtCodeCompletion);
else
SkipUntil(tok::r_paren);
break;
case tok::l_square:
// Recursively skip properly-nested square brackets.
ConsumeBracket();
if (HasFlagsSet(Flags, StopAtCodeCompletion))
SkipUntil(tok::r_square, StopAtCodeCompletion);
else
SkipUntil(tok::r_square);
break;
case tok::l_brace:
// Recursively skip properly-nested braces.
ConsumeBrace();
if (HasFlagsSet(Flags, StopAtCodeCompletion))
SkipUntil(tok::r_brace, StopAtCodeCompletion);
else
SkipUntil(tok::r_brace);
break;
case tok::question:
// Recursively skip ? ... : pairs; these function as brackets. But
// still stop at a semicolon if requested.
ConsumeToken();
SkipUntil(tok::colon,
SkipUntilFlags(unsigned(Flags) &
unsigned(StopAtCodeCompletion | StopAtSemi)));
break;
// Okay, we found a ']' or '}' or ')', which we think should be balanced.
// Since the user wasn't looking for this token (if they were, it would
// already be handled), this isn't balanced. If there is a LHS token at a
// higher level, we will assume that this matches the unbalanced token
// and return it. Otherwise, this is a spurious RHS token, which we skip.
case tok::r_paren:
if (ParenCount && !isFirstTokenSkipped)
return false; // Matches something.
ConsumeParen();
break;
case tok::r_square:
if (BracketCount && !isFirstTokenSkipped)
return false; // Matches something.
ConsumeBracket();
break;
case tok::r_brace:
if (BraceCount && !isFirstTokenSkipped)
return false; // Matches something.
ConsumeBrace();
break;
case tok::semi:
if (HasFlagsSet(Flags, StopAtSemi))
return false;
LLVM_FALLTHROUGH;
default:
// Skip this token.
ConsumeAnyToken();
break;
}
isFirstTokenSkipped = false;
}
}
//===----------------------------------------------------------------------===//
// Scope manipulation
//===----------------------------------------------------------------------===//
/// EnterScope - Start a new scope.
void Parser::EnterScope(unsigned ScopeFlags) {
if (NumCachedScopes) {
Scope *N = ScopeCache[--NumCachedScopes];
N->Init(getCurScope(), ScopeFlags);
Actions.CurScope = N;
} else {
Actions.CurScope = new Scope(getCurScope(), ScopeFlags, Diags);
}
}
/// ExitScope - Pop a scope off the scope stack.
void Parser::ExitScope() {
assert(getCurScope() && "Scope imbalance!");
// Inform the actions module that this scope is going away if there are any
// decls in it.
Actions.ActOnPopScope(Tok.getLocation(), getCurScope());
Scope *OldScope = getCurScope();
Actions.CurScope = OldScope->getParent();
if (NumCachedScopes == ScopeCacheSize)
delete OldScope;
else
ScopeCache[NumCachedScopes++] = OldScope;
}
/// Set the flags for the current scope to ScopeFlags. If ManageFlags is false,
/// this object does nothing.
Parser::ParseScopeFlags::ParseScopeFlags(Parser *Self, unsigned ScopeFlags,
bool ManageFlags)
: CurScope(ManageFlags ? Self->getCurScope() : nullptr) {
if (CurScope) {
OldFlags = CurScope->getFlags();
CurScope->setFlags(ScopeFlags);
}
}
/// Restore the flags for the current scope to what they were before this
/// object overrode them.
Parser::ParseScopeFlags::~ParseScopeFlags() {
if (CurScope)
CurScope->setFlags(OldFlags);
}
//===----------------------------------------------------------------------===//
// C99 6.9: External Definitions.
//===----------------------------------------------------------------------===//
Parser::~Parser() {
// If we still have scopes active, delete the scope tree.
delete getCurScope();
Actions.CurScope = nullptr;
// Free the scope cache.
for (unsigned i = 0, e = NumCachedScopes; i != e; ++i)
delete ScopeCache[i];
resetPragmaHandlers();
PP.removeCommentHandler(CommentSemaHandler.get());
PP.clearCodeCompletionHandler();
if (getLangOpts().DelayedTemplateParsing &&
!PP.isIncrementalProcessingEnabled() && !TemplateIds.empty()) {
// If an ASTConsumer parsed delay-parsed templates in their
// HandleTranslationUnit() method, TemplateIds created there were not
// guarded by a DestroyTemplateIdAnnotationsRAIIObj object in
// ParseTopLevelDecl(). Destroy them here.
DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
}
assert(TemplateIds.empty() && "Still alive TemplateIdAnnotations around?");
}
/// Initialize - Warm up the parser.
///
void Parser::Initialize() {
// Create the translation unit scope. Install it as the current scope.
assert(getCurScope() == nullptr && "A scope is already active?");
EnterScope(Scope::DeclScope);
Actions.ActOnTranslationUnitScope(getCurScope());
// Initialization for Objective-C context sensitive keywords recognition.
// Referenced in Parser::ParseObjCTypeQualifierList.
if (getLangOpts().ObjC) {
ObjCTypeQuals[objc_in] = &PP.getIdentifierTable().get("in");
ObjCTypeQuals[objc_out] = &PP.getIdentifierTable().get("out");
ObjCTypeQuals[objc_inout] = &PP.getIdentifierTable().get("inout");
ObjCTypeQuals[objc_oneway] = &PP.getIdentifierTable().get("oneway");
ObjCTypeQuals[objc_bycopy] = &PP.getIdentifierTable().get("bycopy");
ObjCTypeQuals[objc_byref] = &PP.getIdentifierTable().get("byref");
ObjCTypeQuals[objc_nonnull] = &PP.getIdentifierTable().get("nonnull");
ObjCTypeQuals[objc_nullable] = &PP.getIdentifierTable().get("nullable");
ObjCTypeQuals[objc_null_unspecified]
= &PP.getIdentifierTable().get("null_unspecified");
}
Ident_instancetype = nullptr;
Ident_final = nullptr;
Ident_sealed = nullptr;
Ident_override = nullptr;
Ident_GNU_final = nullptr;
Ident_import = nullptr;
Ident_module = nullptr;
Ident_super = &PP.getIdentifierTable().get("super");
Ident_vector = nullptr;
Ident_bool = nullptr;
Ident_pixel = nullptr;
if (getLangOpts().AltiVec || getLangOpts().ZVector) {
Ident_vector = &PP.getIdentifierTable().get("vector");
Ident_bool = &PP.getIdentifierTable().get("bool");
}
if (getLangOpts().AltiVec)
Ident_pixel = &PP.getIdentifierTable().get("pixel");
Ident_introduced = nullptr;
Ident_deprecated = nullptr;
Ident_obsoleted = nullptr;
Ident_unavailable = nullptr;
Ident_strict = nullptr;
Ident_replacement = nullptr;
Ident_language = Ident_defined_in = Ident_generated_declaration = nullptr;
Ident__except = nullptr;
Ident__exception_code = Ident__exception_info = nullptr;
Ident__abnormal_termination = Ident___exception_code = nullptr;
Ident___exception_info = Ident___abnormal_termination = nullptr;
Ident_GetExceptionCode = Ident_GetExceptionInfo = nullptr;
Ident_AbnormalTermination = nullptr;
if(getLangOpts().Borland) {
Ident__exception_info = PP.getIdentifierInfo("_exception_info");
Ident___exception_info = PP.getIdentifierInfo("__exception_info");
Ident_GetExceptionInfo = PP.getIdentifierInfo("GetExceptionInformation");
Ident__exception_code = PP.getIdentifierInfo("_exception_code");
Ident___exception_code = PP.getIdentifierInfo("__exception_code");
Ident_GetExceptionCode = PP.getIdentifierInfo("GetExceptionCode");
Ident__abnormal_termination = PP.getIdentifierInfo("_abnormal_termination");
Ident___abnormal_termination = PP.getIdentifierInfo("__abnormal_termination");
Ident_AbnormalTermination = PP.getIdentifierInfo("AbnormalTermination");
PP.SetPoisonReason(Ident__exception_code,diag::err_seh___except_block);
PP.SetPoisonReason(Ident___exception_code,diag::err_seh___except_block);
PP.SetPoisonReason(Ident_GetExceptionCode,diag::err_seh___except_block);
PP.SetPoisonReason(Ident__exception_info,diag::err_seh___except_filter);
PP.SetPoisonReason(Ident___exception_info,diag::err_seh___except_filter);
PP.SetPoisonReason(Ident_GetExceptionInfo,diag::err_seh___except_filter);
PP.SetPoisonReason(Ident__abnormal_termination,diag::err_seh___finally_block);
PP.SetPoisonReason(Ident___abnormal_termination,diag::err_seh___finally_block);
PP.SetPoisonReason(Ident_AbnormalTermination,diag::err_seh___finally_block);
}
if (getLangOpts().CPlusPlusModules) {
Ident_import = PP.getIdentifierInfo("import");
Ident_module = PP.getIdentifierInfo("module");
}
Actions.Initialize();
// Prime the lexer look-ahead.
ConsumeToken();
}
void Parser::LateTemplateParserCleanupCallback(void *P) {
// While this RAII helper doesn't bracket any actual work, the destructor will
// clean up annotations that were created during ActOnEndOfTranslationUnit
// when incremental processing is enabled.
DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(((Parser *)P)->TemplateIds);
}
/// Parse the first top-level declaration in a translation unit.
///
/// translation-unit:
/// [C] external-declaration
/// [C] translation-unit external-declaration
/// [C++] top-level-declaration-seq[opt]
/// [C++20] global-module-fragment[opt] module-declaration
/// top-level-declaration-seq[opt] private-module-fragment[opt]
///
/// Note that in C, it is an error if there is no first declaration.
bool Parser::ParseFirstTopLevelDecl(DeclGroupPtrTy &Result) {
Actions.ActOnStartOfTranslationUnit();
// C11 6.9p1 says translation units must have at least one top-level
// declaration. C++ doesn't have this restriction. We also don't want to
// complain if we have a precompiled header, although technically if the PCH
// is empty we should still emit the (pedantic) diagnostic.
bool NoTopLevelDecls = ParseTopLevelDecl(Result, true);
if (NoTopLevelDecls && !Actions.getASTContext().getExternalSource() &&
!getLangOpts().CPlusPlus)
Diag(diag::ext_empty_translation_unit);
return NoTopLevelDecls;
}
/// ParseTopLevelDecl - Parse one top-level declaration, return whatever the
/// action tells us to. This returns true if the EOF was encountered.
///
/// top-level-declaration:
/// declaration
/// [C++20] module-import-declaration
bool Parser::ParseTopLevelDecl(DeclGroupPtrTy &Result, bool IsFirstDecl) {
DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
// Skip over the EOF token, flagging end of previous input for incremental
// processing
if (PP.isIncrementalProcessingEnabled() && Tok.is(tok::eof))
ConsumeToken();
Result = nullptr;
switch (Tok.getKind()) {
case tok::annot_pragma_unused:
HandlePragmaUnused();
return false;
case tok::kw_export:
switch (NextToken().getKind()) {
case tok::kw_module:
goto module_decl;
// Note: no need to handle kw_import here. We only form kw_import under
// the Modules TS, and in that case 'export import' is parsed as an
// export-declaration containing an import-declaration.
// Recognize context-sensitive C++20 'export module' and 'export import'
// declarations.
case tok::identifier: {
IdentifierInfo *II = NextToken().getIdentifierInfo();
if ((II == Ident_module || II == Ident_import) &&
GetLookAheadToken(2).isNot(tok::coloncolon)) {
if (II == Ident_module)
goto module_decl;
else
goto import_decl;
}
break;
}
default:
break;
}
break;
case tok::kw_module:
module_decl:
Result = ParseModuleDecl(IsFirstDecl);
return false;
// tok::kw_import is handled by ParseExternalDeclaration. (Under the Modules
// TS, an import can occur within an export block.)
import_decl: {
Decl *ImportDecl = ParseModuleImport(SourceLocation());
Result = Actions.ConvertDeclToDeclGroup(ImportDecl);
return false;
}
case tok::annot_module_include:
Actions.ActOnModuleInclude(Tok.getLocation(),
reinterpret_cast<Module *>(
Tok.getAnnotationValue()));
ConsumeAnnotationToken();
return false;
case tok::annot_module_begin:
Actions.ActOnModuleBegin(Tok.getLocation(), reinterpret_cast<Module *>(
Tok.getAnnotationValue()));
ConsumeAnnotationToken();
return false;
case tok::annot_module_end:
Actions.ActOnModuleEnd(Tok.getLocation(), reinterpret_cast<Module *>(
Tok.getAnnotationValue()));
ConsumeAnnotationToken();
return false;
case tok::eof:
// Late template parsing can begin.
if (getLangOpts().DelayedTemplateParsing)
Actions.SetLateTemplateParser(LateTemplateParserCallback,
PP.isIncrementalProcessingEnabled() ?
LateTemplateParserCleanupCallback : nullptr,
this);
if (!PP.isIncrementalProcessingEnabled())
Actions.ActOnEndOfTranslationUnit();
//else don't tell Sema that we ended parsing: more input might come.
return true;
case tok::identifier:
// C++2a [basic.link]p3:
// A token sequence beginning with 'export[opt] module' or
// 'export[opt] import' and not immediately followed by '::'
// is never interpreted as the declaration of a top-level-declaration.
if ((Tok.getIdentifierInfo() == Ident_module ||
Tok.getIdentifierInfo() == Ident_import) &&
NextToken().isNot(tok::coloncolon)) {
if (Tok.getIdentifierInfo() == Ident_module)
goto module_decl;
else
goto import_decl;
}
break;
default:
break;
}
ParsedAttributesWithRange attrs(AttrFactory);
MaybeParseCXX11Attributes(attrs);
Result = ParseExternalDeclaration(attrs);
return false;
}
/// ParseExternalDeclaration:
///
/// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl]
/// function-definition
/// declaration
/// [GNU] asm-definition
/// [GNU] __extension__ external-declaration
/// [OBJC] objc-class-definition
/// [OBJC] objc-class-declaration
/// [OBJC] objc-alias-declaration
/// [OBJC] objc-protocol-definition
/// [OBJC] objc-method-definition
/// [OBJC] @end
/// [C++] linkage-specification
/// [GNU] asm-definition:
/// simple-asm-expr ';'
/// [C++11] empty-declaration
/// [C++11] attribute-declaration
///
/// [C++11] empty-declaration:
/// ';'
///
/// [C++0x/GNU] 'extern' 'template' declaration
///
/// [Modules-TS] module-import-declaration
///
Parser::DeclGroupPtrTy
Parser::ParseExternalDeclaration(ParsedAttributesWithRange &attrs,
ParsingDeclSpec *DS) {
DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
ParenBraceBracketBalancer BalancerRAIIObj(*this);
if (PP.isCodeCompletionReached()) {
cutOffParsing();
return nullptr;
}
Decl *SingleDecl = nullptr;
switch (Tok.getKind()) {
case tok::annot_pragma_vis:
HandlePragmaVisibility();
return nullptr;
case tok::annot_pragma_pack:
HandlePragmaPack();
return nullptr;
case tok::annot_pragma_msstruct:
HandlePragmaMSStruct();
return nullptr;
case tok::annot_pragma_align:
HandlePragmaAlign();
return nullptr;
case tok::annot_pragma_weak:
HandlePragmaWeak();
return nullptr;
case tok::annot_pragma_weakalias:
HandlePragmaWeakAlias();
return nullptr;
case tok::annot_pragma_redefine_extname:
HandlePragmaRedefineExtname();
return nullptr;
case tok::annot_pragma_fp_contract:
HandlePragmaFPContract();
return nullptr;
case tok::annot_pragma_fenv_access:
HandlePragmaFEnvAccess();
return nullptr;
case tok::annot_pragma_fp:
HandlePragmaFP();
break;
case tok::annot_pragma_opencl_extension:
HandlePragmaOpenCLExtension();
return nullptr;
case tok::annot_pragma_openmp: {
AccessSpecifier AS = AS_none;
return ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, attrs);
}
case tok::annot_pragma_ms_pointers_to_members:
HandlePragmaMSPointersToMembers();
return nullptr;
case tok::annot_pragma_ms_vtordisp:
HandlePragmaMSVtorDisp();
return nullptr;
case tok::annot_pragma_ms_pragma:
HandlePragmaMSPragma();
return nullptr;
case tok::annot_pragma_dump:
HandlePragmaDump();
return nullptr;
case tok::annot_pragma_attribute:
HandlePragmaAttribute();
return nullptr;
case tok::semi:
// Either a C++11 empty-declaration or attribute-declaration.
SingleDecl =
Actions.ActOnEmptyDeclaration(getCurScope(), attrs, Tok.getLocation());
ConsumeExtraSemi(OutsideFunction);
break;
case tok::r_brace:
Diag(Tok, diag::err_extraneous_closing_brace);
ConsumeBrace();
return nullptr;
case tok::eof:
Diag(Tok, diag::err_expected_external_declaration);
return nullptr;
case tok::kw___extension__: {
// __extension__ silences extension warnings in the subexpression.
ExtensionRAIIObject O(Diags); // Use RAII to do this.
ConsumeToken();
return ParseExternalDeclaration(attrs);
}
case tok::kw_asm: {
ProhibitAttributes(attrs);
SourceLocation StartLoc = Tok.getLocation();
SourceLocation EndLoc;
ExprResult Result(ParseSimpleAsm(&EndLoc));
// Check if GNU-style InlineAsm is disabled.
// Empty asm string is allowed because it will not introduce
// any assembly code.
if (!(getLangOpts().GNUAsm || Result.isInvalid())) {
const auto *SL = cast<StringLiteral>(Result.get());
if (!SL->getString().trim().empty())
Diag(StartLoc, diag::err_gnu_inline_asm_disabled);
}
ExpectAndConsume(tok::semi, diag::err_expected_after,
"top-level asm block");
if (Result.isInvalid())
return nullptr;
SingleDecl = Actions.ActOnFileScopeAsmDecl(Result.get(), StartLoc, EndLoc);
break;
}
case tok::at:
return ParseObjCAtDirectives(attrs);
case tok::minus:
case tok::plus:
if (!getLangOpts().ObjC) {
Diag(Tok, diag::err_expected_external_declaration);
ConsumeToken();
return nullptr;
}
SingleDecl = ParseObjCMethodDefinition();
break;
case tok::code_completion:
if (CurParsedObjCImpl) {
// Code-complete Objective-C methods even without leading '-'/'+' prefix.
Actions.CodeCompleteObjCMethodDecl(getCurScope(),
/*IsInstanceMethod=*/None,
/*ReturnType=*/nullptr);
}
Actions.CodeCompleteOrdinaryName(
getCurScope(),
CurParsedObjCImpl ? Sema::PCC_ObjCImplementation : Sema::PCC_Namespace);
cutOffParsing();
return nullptr;
case tok::kw_import:
SingleDecl = ParseModuleImport(SourceLocation());
break;
case tok::kw_export:
if (getLangOpts().CPlusPlusModules || getLangOpts().ModulesTS) {
SingleDecl = ParseExportDeclaration();
break;
}
// This must be 'export template'. Parse it so we can diagnose our lack
// of support.
LLVM_FALLTHROUGH;
case tok::kw_using:
case tok::kw_namespace:
case tok::kw_typedef:
case tok::kw_template:
case tok::kw_static_assert:
case tok::kw__Static_assert:
// A function definition cannot start with any of these keywords.
{
SourceLocation DeclEnd;
return ParseDeclaration(DeclaratorContext::FileContext, DeclEnd, attrs);
}
case tok::kw_static:
// Parse (then ignore) 'static' prior to a template instantiation. This is
// a GCC extension that we intentionally do not support.
if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
<< 0;
SourceLocation DeclEnd;
return ParseDeclaration(DeclaratorContext::FileContext, DeclEnd, attrs);
}
goto dont_know;
case tok::kw_inline:
if (getLangOpts().CPlusPlus) {
tok::TokenKind NextKind = NextToken().getKind();
// Inline namespaces. Allowed as an extension even in C++03.
if (NextKind == tok::kw_namespace) {
SourceLocation DeclEnd;
return ParseDeclaration(DeclaratorContext::FileContext, DeclEnd, attrs);
}
// Parse (then ignore) 'inline' prior to a template instantiation. This is
// a GCC extension that we intentionally do not support.
if (NextKind == tok::kw_template) {
Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
<< 1;
SourceLocation DeclEnd;
return ParseDeclaration(DeclaratorContext::FileContext, DeclEnd, attrs);
}
}
goto dont_know;
case tok::kw_extern:
if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
// Extern templates
SourceLocation ExternLoc = ConsumeToken();
SourceLocation TemplateLoc = ConsumeToken();
Diag(ExternLoc, getLangOpts().CPlusPlus11 ?
diag::warn_cxx98_compat_extern_template :
diag::ext_extern_template) << SourceRange(ExternLoc, TemplateLoc);
SourceLocation DeclEnd;
return Actions.ConvertDeclToDeclGroup(
ParseExplicitInstantiation(DeclaratorContext::FileContext, ExternLoc,
TemplateLoc, DeclEnd, attrs));
}
goto dont_know;
case tok::kw___if_exists:
case tok::kw___if_not_exists:
ParseMicrosoftIfExistsExternalDeclaration();
return nullptr;
case tok::kw_module:
Diag(Tok, diag::err_unexpected_module_decl);
SkipUntil(tok::semi);
return nullptr;
default:
dont_know:
if (Tok.isEditorPlaceholder()) {
ConsumeToken();
return nullptr;
}
// We can't tell whether this is a function-definition or declaration yet.
return ParseDeclarationOrFunctionDefinition(attrs, DS);
}
// This routine returns a DeclGroup, if the thing we parsed only contains a
// single decl, convert it now.
return Actions.ConvertDeclToDeclGroup(SingleDecl);
}
/// Determine whether the current token, if it occurs after a
/// declarator, continues a declaration or declaration list.
bool Parser::isDeclarationAfterDeclarator() {
// Check for '= delete' or '= default'
if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
const Token &KW = NextToken();
if (KW.is(tok::kw_default) || KW.is(tok::kw_delete))
return false;
}
return Tok.is(tok::equal) || // int X()= -> not a function def
Tok.is(tok::comma) || // int X(), -> not a function def
Tok.is(tok::semi) || // int X(); -> not a function def
Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def
Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def
(getLangOpts().CPlusPlus &&
Tok.is(tok::l_paren)); // int X(0) -> not a function def [C++]
}
/// Determine whether the current token, if it occurs after a
/// declarator, indicates the start of a function definition.
bool Parser::isStartOfFunctionDefinition(const ParsingDeclarator &Declarator) {
assert(Declarator.isFunctionDeclarator() && "Isn't a function declarator");
if (Tok.is(tok::l_brace)) // int X() {}
return true;
// Handle K&R C argument lists: int X(f) int f; {}
if (!getLangOpts().CPlusPlus &&
Declarator.getFunctionTypeInfo().isKNRPrototype())
return isDeclarationSpecifier();
if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
const Token &KW = NextToken();
return KW.is(tok::kw_default) || KW.is(tok::kw_delete);
}
return Tok.is(tok::colon) || // X() : Base() {} (used for ctors)
Tok.is(tok::kw_try); // X() try { ... }
}
/// Parse either a function-definition or a declaration. We can't tell which
/// we have until we read up to the compound-statement in function-definition.
/// TemplateParams, if non-NULL, provides the template parameters when we're
/// parsing a C++ template-declaration.
///
/// function-definition: [C99 6.9.1]
/// decl-specs declarator declaration-list[opt] compound-statement
/// [C90] function-definition: [C99 6.7.1] - implicit int result
/// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
///
/// declaration: [C99 6.7]
/// declaration-specifiers init-declarator-list[opt] ';'
/// [!C99] init-declarator-list ';' [TODO: warn in c99 mode]
/// [OMP] threadprivate-directive
/// [OMP] allocate-directive [TODO]
///
Parser::DeclGroupPtrTy
Parser::ParseDeclOrFunctionDefInternal(ParsedAttributesWithRange &attrs,
ParsingDeclSpec &DS,
AccessSpecifier AS) {
MaybeParseMicrosoftAttributes(DS.getAttributes());
// Parse the common declaration-specifiers piece.
ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS,
DeclSpecContext::DSC_top_level);
// If we had a free-standing type definition with a missing semicolon, we
// may get this far before the problem becomes obvious.
if (DS.hasTagDefinition() && DiagnoseMissingSemiAfterTagDefinition(
DS, AS, DeclSpecContext::DSC_top_level))
return nullptr;
// C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
// declaration-specifiers init-declarator-list[opt] ';'
if (Tok.is(tok::semi)) {
auto LengthOfTSTToken = [](DeclSpec::TST TKind) {
assert(DeclSpec::isDeclRep(TKind));
switch(TKind) {
case DeclSpec::TST_class:
return 5;
case DeclSpec::TST_struct:
return 6;
case DeclSpec::TST_union:
return 5;
case DeclSpec::TST_enum:
return 4;
case DeclSpec::TST_interface:
return 9;
default:
llvm_unreachable("we only expect to get the length of the class/struct/union/enum");
}
};
// Suggest correct location to fix '[[attrib]] struct' to 'struct [[attrib]]'
SourceLocation CorrectLocationForAttributes =
DeclSpec::isDeclRep(DS.getTypeSpecType())
? DS.getTypeSpecTypeLoc().getLocWithOffset(
LengthOfTSTToken(DS.getTypeSpecType()))
: SourceLocation();
ProhibitAttributes(attrs, CorrectLocationForAttributes);
ConsumeToken();
RecordDecl *AnonRecord = nullptr;
Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS_none,
DS, AnonRecord);
DS.complete(TheDecl);
if (getLangOpts().OpenCL)
Actions.setCurrentOpenCLExtensionForDecl(TheDecl);
if (AnonRecord) {
Decl* decls[] = {AnonRecord, TheDecl};
return Actions.BuildDeclaratorGroup(decls);
}
return Actions.ConvertDeclToDeclGroup(TheDecl);
}
DS.takeAttributesFrom(attrs);
// ObjC2 allows prefix attributes on class interfaces and protocols.
// FIXME: This still needs better diagnostics. We should only accept
// attributes here, no types, etc.
if (getLangOpts().ObjC && Tok.is(tok::at)) {
SourceLocation AtLoc = ConsumeToken(); // the "@"
if (!Tok.isObjCAtKeyword(tok::objc_interface) &&
!Tok.isObjCAtKeyword(tok::objc_protocol) &&
!Tok.isObjCAtKeyword(tok::objc_implementation)) {
Diag(Tok, diag::err_objc_unexpected_attr);
SkipUntil(tok::semi);
return nullptr;
}
DS.abort();
const char *PrevSpec = nullptr;
unsigned DiagID;
if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec, DiagID,
Actions.getASTContext().getPrintingPolicy()))
Diag(AtLoc, DiagID) << PrevSpec;
if (Tok.isObjCAtKeyword(tok::objc_protocol))
return ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes());
if (Tok.isObjCAtKeyword(tok::objc_implementation))
return ParseObjCAtImplementationDeclaration(AtLoc, DS.getAttributes());
return Actions.ConvertDeclToDeclGroup(
ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes()));
}
// If the declspec consisted only of 'extern' and we have a string
// literal following it, this must be a C++ linkage specifier like
// 'extern "C"'.
if (getLangOpts().CPlusPlus && isTokenStringLiteral() &&
DS.getStorageClassSpec() == DeclSpec::SCS_extern &&
DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) {
Decl *TheDecl = ParseLinkage(DS, DeclaratorContext::FileContext);
return Actions.ConvertDeclToDeclGroup(TheDecl);
}
return ParseDeclGroup(DS, DeclaratorContext::FileContext);
}
Parser::DeclGroupPtrTy
Parser::ParseDeclarationOrFunctionDefinition(ParsedAttributesWithRange &attrs,
ParsingDeclSpec *DS,
AccessSpecifier AS) {
if (DS) {
return ParseDeclOrFunctionDefInternal(attrs, *DS, AS);
} else {
ParsingDeclSpec PDS(*this);
// Must temporarily exit the objective-c container scope for
// parsing c constructs and re-enter objc container scope
// afterwards.
ObjCDeclContextSwitch ObjCDC(*this);
return ParseDeclOrFunctionDefInternal(attrs, PDS, AS);
}
}
/// ParseFunctionDefinition - We parsed and verified that the specified
/// Declarator is well formed. If this is a K&R-style function, read the
/// parameters declaration-list, then start the compound-statement.
///
/// function-definition: [C99 6.9.1]
/// decl-specs declarator declaration-list[opt] compound-statement
/// [C90] function-definition: [C99 6.7.1] - implicit int result
/// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
/// [C++] function-definition: [C++ 8.4]
/// decl-specifier-seq[opt] declarator ctor-initializer[opt]
/// function-body
/// [C++] function-definition: [C++ 8.4]
/// decl-specifier-seq[opt] declarator function-try-block
///
Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
const ParsedTemplateInfo &TemplateInfo,
LateParsedAttrList *LateParsedAttrs) {
// Poison SEH identifiers so they are flagged as illegal in function bodies.
PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
// If this is C90 and the declspecs were completely missing, fudge in an
// implicit int. We do this here because this is the only place where
// declaration-specifiers are completely optional in the grammar.
if (getLangOpts().ImplicitInt && D.getDeclSpec().isEmpty()) {
const char *PrevSpec;
unsigned DiagID;
const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
D.getMutableDeclSpec().SetTypeSpecType(DeclSpec::TST_int,
D.getIdentifierLoc(),
PrevSpec, DiagID,
Policy);
D.SetRangeBegin(D.getDeclSpec().getSourceRange().getBegin());
}
// If this declaration was formed with a K&R-style identifier list for the
// arguments, parse declarations for all of the args next.
// int foo(a,b) int a; float b; {}
if (FTI.isKNRPrototype())
ParseKNRParamDeclarations(D);
// We should have either an opening brace or, in a C++ constructor,
// we may have a colon.
if (Tok.isNot(tok::l_brace) &&
(!getLangOpts().CPlusPlus ||
(Tok.isNot(tok::colon) && Tok.isNot(tok::kw_try) &&
Tok.isNot(tok::equal)))) {
Diag(Tok, diag::err_expected_fn_body);
// Skip over garbage, until we get to '{'. Don't eat the '{'.
SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch);
// If we didn't find the '{', bail out.
if (Tok.isNot(tok::l_brace))
return nullptr;
}
// Check to make sure that any normal attributes are allowed to be on
// a definition. Late parsed attributes are checked at the end.
if (Tok.isNot(tok::equal)) {
for (const ParsedAttr &AL : D.getAttributes())
if (AL.isKnownToGCC() && !AL.isCXX11Attribute())
Diag(AL.getLoc(), diag::warn_attribute_on_function_definition) << AL;
}
// In delayed template parsing mode, for function template we consume the
// tokens and store them for late parsing at the end of the translation unit.
if (getLangOpts().DelayedTemplateParsing && Tok.isNot(tok::equal) &&
TemplateInfo.Kind == ParsedTemplateInfo::Template &&
Actions.canDelayFunctionBody(D)) {
MultiTemplateParamsArg TemplateParameterLists(*TemplateInfo.TemplateParams);
ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
Scope::CompoundStmtScope);
Scope *ParentScope = getCurScope()->getParent();
D.setFunctionDefinitionKind(FDK_Definition);
Decl *DP = Actions.HandleDeclarator(ParentScope, D,
TemplateParameterLists);
D.complete(DP);
D.getMutableDeclSpec().abort();
if (SkipFunctionBodies && (!DP || Actions.canSkipFunctionBody(DP)) &&
trySkippingFunctionBody()) {
BodyScope.Exit();
return Actions.ActOnSkippedFunctionBody(DP);
}
CachedTokens Toks;
LexTemplateFunctionForLateParsing(Toks);
if (DP) {
FunctionDecl *FnD = DP->getAsFunction();
Actions.CheckForFunctionRedefinition(FnD);
Actions.MarkAsLateParsedTemplate(FnD, DP, Toks);
}
return DP;
}
else if (CurParsedObjCImpl &&
!TemplateInfo.TemplateParams &&
(Tok.is(tok::l_brace) || Tok.is(tok::kw_try) ||
Tok.is(tok::colon)) &&
Actions.CurContext->isTranslationUnit()) {
ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
Scope::CompoundStmtScope);
Scope *ParentScope = getCurScope()->getParent();
D.setFunctionDefinitionKind(FDK_Definition);
Decl *FuncDecl = Actions.HandleDeclarator(ParentScope, D,
MultiTemplateParamsArg());
D.complete(FuncDecl);
D.getMutableDeclSpec().abort();
if (FuncDecl) {
// Consume the tokens and store them for later parsing.
StashAwayMethodOrFunctionBodyTokens(FuncDecl);
CurParsedObjCImpl->HasCFunction = true;
return FuncDecl;
}
// FIXME: Should we really fall through here?
}
// Enter a scope for the function body.
ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
Scope::CompoundStmtScope);
// Tell the actions module that we have entered a function definition with the
// specified Declarator for the function.
Sema::SkipBodyInfo SkipBody;
Decl *Res = Actions.ActOnStartOfFunctionDef(getCurScope(), D,
TemplateInfo.TemplateParams
? *TemplateInfo.TemplateParams
: MultiTemplateParamsArg(),
&SkipBody);
if (SkipBody.ShouldSkip) {
SkipFunctionBody();
return Res;
}
// Break out of the ParsingDeclarator context before we parse the body.
D.complete(Res);
// Break out of the ParsingDeclSpec context, too. This const_cast is
// safe because we're always the sole owner.
D.getMutableDeclSpec().abort();
if (TryConsumeToken(tok::equal)) {
assert(getLangOpts().CPlusPlus && "Only C++ function definitions have '='");
bool Delete = false;
SourceLocation KWLoc;
if (TryConsumeToken(tok::kw_delete, KWLoc)) {
Diag(KWLoc, getLangOpts().CPlusPlus11
? diag::warn_cxx98_compat_defaulted_deleted_function
: diag::ext_defaulted_deleted_function)
<< 1 /* deleted */;
Actions.SetDeclDeleted(Res, KWLoc);
Delete = true;
} else if (TryConsumeToken(tok::kw_default, KWLoc)) {
Diag(KWLoc, getLangOpts().CPlusPlus11
? diag::warn_cxx98_compat_defaulted_deleted_function
: diag::ext_defaulted_deleted_function)
<< 0 /* defaulted */;
Actions.SetDeclDefaulted(Res, KWLoc);
} else {
llvm_unreachable("function definition after = not 'delete' or 'default'");
}
if (Tok.is(tok::comma)) {
Diag(KWLoc, diag::err_default_delete_in_multiple_declaration)
<< Delete;
SkipUntil(tok::semi);
} else if (ExpectAndConsume(tok::semi, diag::err_expected_after,
Delete ? "delete" : "default")) {
SkipUntil(tok::semi);
}
Stmt *GeneratedBody = Res ? Res->getBody() : nullptr;
Actions.ActOnFinishFunctionBody(Res, GeneratedBody, false);
return Res;
}
if (SkipFunctionBodies && (!Res || Actions.canSkipFunctionBody(Res)) &&
trySkippingFunctionBody()) {
BodyScope.Exit();
Actions.ActOnSkippedFunctionBody(Res);
return Actions.ActOnFinishFunctionBody(Res, nullptr, false);
}
if (Tok.is(tok::kw_try))
return ParseFunctionTryBlock(Res, BodyScope);
// If we have a colon, then we're probably parsing a C++
// ctor-initializer.
if (Tok.is(tok::colon)) {
ParseConstructorInitializer(Res);
// Recover from error.
if (!Tok.is(tok::l_brace)) {
BodyScope.Exit();
Actions.ActOnFinishFunctionBody(Res, nullptr);
return Res;
}
} else
Actions.ActOnDefaultCtorInitializers(Res);
// Late attributes are parsed in the same scope as the function body.
if (LateParsedAttrs)
ParseLexedAttributeList(*LateParsedAttrs, Res, false, true);
return ParseFunctionStatementBody(Res, BodyScope);
}
void Parser::SkipFunctionBody() {
if (Tok.is(tok::equal)) {
SkipUntil(tok::semi);
return;
}
bool IsFunctionTryBlock = Tok.is(tok::kw_try);
if (IsFunctionTryBlock)
ConsumeToken();
CachedTokens Skipped;
if (ConsumeAndStoreFunctionPrologue(Skipped))
SkipMalformedDecl();
else {
SkipUntil(tok::r_brace);
while (IsFunctionTryBlock && Tok.is(tok::kw_catch)) {
SkipUntil(tok::l_brace);
SkipUntil(tok::r_brace);
}
}
}
/// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides
/// types for a function with a K&R-style identifier list for arguments.
void Parser::ParseKNRParamDeclarations(Declarator &D) {
// We know that the top-level of this declarator is a function.
DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
// Enter function-declaration scope, limiting any declarators to the
// function prototype scope, including parameter declarators.
ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope |
Scope::FunctionDeclarationScope | Scope::DeclScope);
// Read all the argument declarations.
while (isDeclarationSpecifier()) {
SourceLocation DSStart = Tok.getLocation();
// Parse the common declaration-specifiers piece.
DeclSpec DS(AttrFactory);
ParseDeclarationSpecifiers(DS);
// C99 6.9.1p6: 'each declaration in the declaration list shall have at
// least one declarator'.
// NOTE: GCC just makes this an ext-warn. It's not clear what it does with
// the declarations though. It's trivial to ignore them, really hard to do
// anything else with them.
if (TryConsumeToken(tok::semi)) {
Diag(DSStart, diag::err_declaration_does_not_declare_param);
continue;
}
// C99 6.9.1p6: Declarations shall contain no storage-class specifiers other
// than register.
if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
DS.getStorageClassSpec() != DeclSpec::SCS_register) {
Diag(DS.getStorageClassSpecLoc(),
diag::err_invalid_storage_class_in_func_decl);
DS.ClearStorageClassSpecs();
}
if (DS.getThreadStorageClassSpec() != DeclSpec::TSCS_unspecified) {
Diag(DS.getThreadStorageClassSpecLoc(),
diag::err_invalid_storage_class_in_func_decl);
DS.ClearStorageClassSpecs();
}
// Parse the first declarator attached to this declspec.
Declarator ParmDeclarator(DS, DeclaratorContext::KNRTypeListContext);
ParseDeclarator(ParmDeclarator);
// Handle the full declarator list.
while (1) {
// If attributes are present, parse them.
MaybeParseGNUAttributes(ParmDeclarator);
// Ask the actions module to compute the type for this declarator.
Decl *Param =
Actions.ActOnParamDeclarator(getCurScope(), ParmDeclarator);
if (Param &&
// A missing identifier has already been diagnosed.
ParmDeclarator.getIdentifier()) {
// Scan the argument list looking for the correct param to apply this
// type.
for (unsigned i = 0; ; ++i) {
// C99 6.9.1p6: those declarators shall declare only identifiers from
// the identifier list.
if (i == FTI.NumParams) {
Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param)
<< ParmDeclarator.getIdentifier();
break;
}
if (FTI.Params[i].Ident == ParmDeclarator.getIdentifier()) {
// Reject redefinitions of parameters.
if (FTI.Params[i].Param) {
Diag(ParmDeclarator.getIdentifierLoc(),
diag::err_param_redefinition)
<< ParmDeclarator.getIdentifier();
} else {
FTI.Params[i].Param = Param;
}
break;
}
}
}
// If we don't have a comma, it is either the end of the list (a ';') or
// an error, bail out.
if (Tok.isNot(tok::comma))
break;
ParmDeclarator.clear();
// Consume the comma.
ParmDeclarator.setCommaLoc(ConsumeToken());
// Parse the next declarator.
ParseDeclarator(ParmDeclarator);
}
// Consume ';' and continue parsing.
if (!ExpectAndConsumeSemi(diag::err_expected_semi_declaration))
continue;
// Otherwise recover by skipping to next semi or mandatory function body.
if (SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch))
break;
TryConsumeToken(tok::semi);
}
// The actions module must verify that all arguments were declared.
Actions.ActOnFinishKNRParamDeclarations(getCurScope(), D, Tok.getLocation());
}
/// ParseAsmStringLiteral - This is just a normal string-literal, but is not
/// allowed to be a wide string, and is not subject to character translation.
///
/// [GNU] asm-string-literal:
/// string-literal
///
ExprResult Parser::ParseAsmStringLiteral() {
if (!isTokenStringLiteral()) {
Diag(Tok, diag::err_expected_string_literal)
<< /*Source='in...'*/0 << "'asm'";
return ExprError();
}
ExprResult AsmString(ParseStringLiteralExpression());
if (!AsmString.isInvalid()) {
const auto *SL = cast<StringLiteral>(AsmString.get());
if (!SL->isAscii()) {
Diag(Tok, diag::err_asm_operand_wide_string_literal)
<< SL->isWide()
<< SL->getSourceRange();
return ExprError();
}
}
return AsmString;
}
/// ParseSimpleAsm
///
/// [GNU] simple-asm-expr:
/// 'asm' '(' asm-string-literal ')'
///
ExprResult Parser::ParseSimpleAsm(SourceLocation *EndLoc) {
assert(Tok.is(tok::kw_asm) && "Not an asm!");
SourceLocation Loc = ConsumeToken();
if (Tok.is(tok::kw_volatile)) {
// Remove from the end of 'asm' to the end of 'volatile'.
SourceRange RemovalRange(PP.getLocForEndOfToken(Loc),
PP.getLocForEndOfToken(Tok.getLocation()));
Diag(Tok, diag::warn_file_asm_volatile)
<< FixItHint::CreateRemoval(RemovalRange);
ConsumeToken();
}
BalancedDelimiterTracker T(*this, tok::l_paren);
if (T.consumeOpen()) {
Diag(Tok, diag::err_expected_lparen_after) << "asm";
return ExprError();
}
ExprResult Result(ParseAsmStringLiteral());
if (!Result.isInvalid()) {
// Close the paren and get the location of the end bracket
T.consumeClose();
if (EndLoc)
*EndLoc = T.getCloseLocation();
} else if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) {
if (EndLoc)
*EndLoc = Tok.getLocation();
ConsumeParen();
}
return Result;
}
/// Get the TemplateIdAnnotation from the token and put it in the
/// cleanup pool so that it gets destroyed when parsing the current top level
/// declaration is finished.
TemplateIdAnnotation *Parser::takeTemplateIdAnnotation(const Token &tok) {
assert(tok.is(tok::annot_template_id) && "Expected template-id token");
TemplateIdAnnotation *
Id = static_cast<TemplateIdAnnotation *>(tok.getAnnotationValue());
return Id;
}
void Parser::AnnotateScopeToken(CXXScopeSpec &SS, bool IsNewAnnotation) {
// Push the current token back into the token stream (or revert it if it is
// cached) and use an annotation scope token for current token.
if (PP.isBacktrackEnabled())
PP.RevertCachedTokens(1);
else
PP.EnterToken(Tok, /*IsReinject=*/true);
Tok.setKind(tok::annot_cxxscope);
Tok.setAnnotationValue(Actions.SaveNestedNameSpecifierAnnotation(SS));
Tok.setAnnotationRange(SS.getRange());
// In case the tokens were cached, have Preprocessor replace them
// with the annotation token. We don't need to do this if we've
// just reverted back to a prior state.
if (IsNewAnnotation)
PP.AnnotateCachedTokens(Tok);
}
/// Attempt to classify the name at the current token position. This may
/// form a type, scope or primary expression annotation, or replace the token
/// with a typo-corrected keyword. This is only appropriate when the current
/// name must refer to an entity which has already been declared.
///
/// \param CCC Indicates how to perform typo-correction for this name. If NULL,
/// no typo correction will be performed.
Parser::AnnotatedNameKind
Parser::TryAnnotateName(CorrectionCandidateCallback *CCC) {
assert(Tok.is(tok::identifier) || Tok.is(tok::annot_cxxscope));
const bool EnteringContext = false;
const bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
CXXScopeSpec SS;
if (getLangOpts().CPlusPlus &&
ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
return ANK_Error;
if (Tok.isNot(tok::identifier) || SS.isInvalid()) {
if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation))
return ANK_Error;
return ANK_Unresolved;
}
IdentifierInfo *Name = Tok.getIdentifierInfo();
SourceLocation NameLoc = Tok.getLocation();
// FIXME: Move the tentative declaration logic into ClassifyName so we can
// typo-correct to tentatively-declared identifiers.
if (isTentativelyDeclared(Name)) {
// Identifier has been tentatively declared, and thus cannot be resolved as
// an expression. Fall back to annotating it as a type.
if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation))
return ANK_Error;
return Tok.is(tok::annot_typename) ? ANK_Success : ANK_TentativeDecl;
}
Token Next = NextToken();
// Look up and classify the identifier. We don't perform any typo-correction
// after a scope specifier, because in general we can't recover from typos
// there (eg, after correcting 'A::template B<X>::C' [sic], we would need to
// jump back into scope specifier parsing).
Sema::NameClassification Classification = Actions.ClassifyName(
getCurScope(), SS, Name, NameLoc, Next, SS.isEmpty() ? CCC : nullptr);
// If name lookup found nothing and we guessed that this was a template name,
// double-check before committing to that interpretation. C++20 requires that
// we interpret this as a template-id if it can be, but if it can't be, then
// this is an error recovery case.
if (Classification.getKind() == Sema::NC_UndeclaredTemplate &&
isTemplateArgumentList(1) == TPResult::False) {
// It's not a template-id; re-classify without the '<' as a hint.
Token FakeNext = Next;
FakeNext.setKind(tok::unknown);
Classification =
Actions.ClassifyName(getCurScope(), SS, Name, NameLoc, FakeNext,
SS.isEmpty() ? CCC : nullptr);
}
switch (Classification.getKind()) {
case Sema::NC_Error:
return ANK_Error;
case Sema::NC_Keyword:
// The identifier was typo-corrected to a keyword.
Tok.setIdentifierInfo(Name);
Tok.setKind(Name->getTokenID());
PP.TypoCorrectToken(Tok);
if (SS.isNotEmpty())
AnnotateScopeToken(SS, !WasScopeAnnotation);
// We've "annotated" this as a keyword.
return ANK_Success;
case Sema::NC_Unknown:
// It's not something we know about. Leave it unannotated.
break;
case Sema::NC_Type: {
SourceLocation BeginLoc = NameLoc;
if (SS.isNotEmpty())
BeginLoc = SS.getBeginLoc();
/// An Objective-C object type followed by '<' is a specialization of
/// a parameterized class type or a protocol-qualified type.
ParsedType Ty = Classification.getType();
if (getLangOpts().ObjC && NextToken().is(tok::less) &&
(Ty.get()->isObjCObjectType() ||
Ty.get()->isObjCObjectPointerType())) {
// Consume the name.
SourceLocation IdentifierLoc = ConsumeToken();
SourceLocation NewEndLoc;
TypeResult NewType
= parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
/*consumeLastToken=*/false,
NewEndLoc);
if (NewType.isUsable())
Ty = NewType.get();
else if (Tok.is(tok::eof)) // Nothing to do here, bail out...
return ANK_Error;
}
Tok.setKind(tok::annot_typename);
setTypeAnnotation(Tok, Ty);
Tok.setAnnotationEndLoc(Tok.getLocation());
Tok.setLocation(BeginLoc);
PP.AnnotateCachedTokens(Tok);
return ANK_Success;
}
case Sema::NC_ContextIndependentExpr:
Tok.setKind(tok::annot_primary_expr);
setExprAnnotation(Tok, Classification.getExpression());
Tok.setAnnotationEndLoc(NameLoc);
if (SS.isNotEmpty())
Tok.setLocation(SS.getBeginLoc());
PP.AnnotateCachedTokens(Tok);
return ANK_Success;
case Sema::NC_NonType:
Tok.setKind(tok::annot_non_type);
setNonTypeAnnotation(Tok, Classification.getNonTypeDecl());
Tok.setLocation(NameLoc);
Tok.setAnnotationEndLoc(NameLoc);
PP.AnnotateCachedTokens(Tok);
if (SS.isNotEmpty())
AnnotateScopeToken(SS, !WasScopeAnnotation);
return ANK_Success;
case Sema::NC_UndeclaredNonType:
case Sema::NC_DependentNonType:
Tok.setKind(Classification.getKind() == Sema::NC_UndeclaredNonType
? tok::annot_non_type_undeclared
: tok::annot_non_type_dependent);
setIdentifierAnnotation(Tok, Name);
Tok.setLocation(NameLoc);
Tok.setAnnotationEndLoc(NameLoc);
PP.AnnotateCachedTokens(Tok);
if (SS.isNotEmpty())
AnnotateScopeToken(SS, !WasScopeAnnotation);
return ANK_Success;
case Sema::NC_TypeTemplate:
if (Next.isNot(tok::less)) {
// This may be a type template being used as a template template argument.
if (SS.isNotEmpty())
AnnotateScopeToken(SS, !WasScopeAnnotation);
return ANK_TemplateName;
}
LLVM_FALLTHROUGH;
case Sema::NC_VarTemplate:
case Sema::NC_FunctionTemplate:
case Sema::NC_UndeclaredTemplate: {
// We have a type, variable or function template followed by '<'.
ConsumeToken();
UnqualifiedId Id;
Id.setIdentifier(Name, NameLoc);
if (AnnotateTemplateIdToken(
TemplateTy::make(Classification.getTemplateName()),
Classification.getTemplateNameKind(), SS, SourceLocation(), Id))
return ANK_Error;
return ANK_Success;
}
}
// Unable to classify the name, but maybe we can annotate a scope specifier.
if (SS.isNotEmpty())
AnnotateScopeToken(SS, !WasScopeAnnotation);
return ANK_Unresolved;
}
bool Parser::TryKeywordIdentFallback(bool DisableKeyword) {
assert(Tok.isNot(tok::identifier));
Diag(Tok, diag::ext_keyword_as_ident)
<< PP.getSpelling(Tok)
<< DisableKeyword;
if (DisableKeyword)
Tok.getIdentifierInfo()->revertTokenIDToIdentifier();
Tok.setKind(tok::identifier);
return true;
}
/// TryAnnotateTypeOrScopeToken - If the current token position is on a
/// typename (possibly qualified in C++) or a C++ scope specifier not followed
/// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens
/// with a single annotation token representing the typename or C++ scope
/// respectively.
/// This simplifies handling of C++ scope specifiers and allows efficient
/// backtracking without the need to re-parse and resolve nested-names and
/// typenames.
/// It will mainly be called when we expect to treat identifiers as typenames
/// (if they are typenames). For example, in C we do not expect identifiers
/// inside expressions to be treated as typenames so it will not be called
/// for expressions in C.
/// The benefit for C/ObjC is that a typename will be annotated and
/// Actions.getTypeName will not be needed to be called again (e.g. getTypeName
/// will not be called twice, once to check whether we have a declaration
/// specifier, and another one to get the actual type inside
/// ParseDeclarationSpecifiers).
///
/// This returns true if an error occurred.
///
/// Note that this routine emits an error if you call it with ::new or ::delete
/// as the current tokens, so only call it in contexts where these are invalid.
bool Parser::TryAnnotateTypeOrScopeToken() {
assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
Tok.is(tok::kw_typename) || Tok.is(tok::annot_cxxscope) ||
Tok.is(tok::kw_decltype) || Tok.is(tok::annot_template_id) ||
Tok.is(tok::kw___super)) &&
"Cannot be a type or scope token!");
if (Tok.is(tok::kw_typename)) {
// MSVC lets you do stuff like:
// typename typedef T_::D D;
//
// We will consume the typedef token here and put it back after we have
// parsed the first identifier, transforming it into something more like:
// typename T_::D typedef D;
if (getLangOpts().MSVCCompat && NextToken().is(tok::kw_typedef)) {
Token TypedefToken;
PP.Lex(TypedefToken);
bool Result = TryAnnotateTypeOrScopeToken();
PP.EnterToken(Tok, /*IsReinject=*/true);
Tok = TypedefToken;
if (!Result)
Diag(Tok.getLocation(), diag::warn_expected_qualified_after_typename);
return Result;
}
// Parse a C++ typename-specifier, e.g., "typename T::type".
//
// typename-specifier:
// 'typename' '::' [opt] nested-name-specifier identifier
// 'typename' '::' [opt] nested-name-specifier template [opt]
// simple-template-id
SourceLocation TypenameLoc = ConsumeToken();
CXXScopeSpec SS;
if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
/*EnteringContext=*/false, nullptr,
/*IsTypename*/ true))
return true;
if (!SS.isSet()) {
if (Tok.is(tok::identifier) || Tok.is(tok::annot_template_id) ||
Tok.is(tok::annot_decltype)) {
// Attempt to recover by skipping the invalid 'typename'
if (Tok.is(tok::annot_decltype) ||
(!TryAnnotateTypeOrScopeToken() && Tok.isAnnotation())) {
unsigned DiagID = diag::err_expected_qualified_after_typename;
// MS compatibility: MSVC permits using known types with typename.
// e.g. "typedef typename T* pointer_type"
if (getLangOpts().MicrosoftExt)
DiagID = diag::warn_expected_qualified_after_typename;
Diag(Tok.getLocation(), DiagID);
return false;
}
}
if (Tok.isEditorPlaceholder())
return true;
Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename);
return true;
}
TypeResult Ty;
if (Tok.is(tok::identifier)) {
// FIXME: check whether the next token is '<', first!
Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
*Tok.getIdentifierInfo(),
Tok.getLocation());
} else if (Tok.is(tok::annot_template_id)) {
TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
if (TemplateId->Kind != TNK_Type_template &&
TemplateId->Kind != TNK_Dependent_template_name &&
TemplateId->Kind != TNK_Undeclared_template) {
Diag(Tok, diag::err_typename_refers_to_non_type_template)
<< Tok.getAnnotationRange();
return true;
}
ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
TemplateId->NumArgs);
Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
TemplateId->TemplateKWLoc,
TemplateId->Template,
TemplateId->Name,
TemplateId->TemplateNameLoc,
TemplateId->LAngleLoc,
TemplateArgsPtr,
TemplateId->RAngleLoc);
} else {
Diag(Tok, diag::err_expected_type_name_after_typename)
<< SS.getRange();
return true;
}
SourceLocation EndLoc = Tok.getLastLoc();
Tok.setKind(tok::annot_typename);
setTypeAnnotation(Tok, Ty.isInvalid() ? nullptr : Ty.get());
Tok.setAnnotationEndLoc(EndLoc);
Tok.setLocation(TypenameLoc);
PP.AnnotateCachedTokens(Tok);
return false;
}
// Remembers whether the token was originally a scope annotation.
bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
CXXScopeSpec SS;
if (getLangOpts().CPlusPlus)
if (ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext*/false))
return true;
return TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation);
}
/// Try to annotate a type or scope token, having already parsed an
/// optional scope specifier. \p IsNewScope should be \c true unless the scope
/// specifier was extracted from an existing tok::annot_cxxscope annotation.
bool Parser::TryAnnotateTypeOrScopeTokenAfterScopeSpec(CXXScopeSpec &SS,
bool IsNewScope) {
if (Tok.is(tok::identifier)) {
// Determine whether the identifier is a type name.
if (ParsedType Ty = Actions.getTypeName(
*Tok.getIdentifierInfo(), Tok.getLocation(), getCurScope(), &SS,
false, NextToken().is(tok::period), nullptr,
/*IsCtorOrDtorName=*/false,
/*NonTrivialTypeSourceInfo*/true,
/*IsClassTemplateDeductionContext*/true)) {
SourceLocation BeginLoc = Tok.getLocation();
if (SS.isNotEmpty()) // it was a C++ qualified type name.
BeginLoc = SS.getBeginLoc();
/// An Objective-C object type followed by '<' is a specialization of
/// a parameterized class type or a protocol-qualified type.
if (getLangOpts().ObjC && NextToken().is(tok::less) &&
(Ty.get()->isObjCObjectType() ||
Ty.get()->isObjCObjectPointerType())) {
// Consume the name.
SourceLocation IdentifierLoc = ConsumeToken();
SourceLocation NewEndLoc;
TypeResult NewType
= parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
/*consumeLastToken=*/false,
NewEndLoc);
if (NewType.isUsable())
Ty = NewType.get();
else if (Tok.is(tok::eof)) // Nothing to do here, bail out...
return false;
}
// This is a typename. Replace the current token in-place with an
// annotation type token.
Tok.setKind(tok::annot_typename);
setTypeAnnotation(Tok, Ty);
Tok.setAnnotationEndLoc(Tok.getLocation());
Tok.setLocation(BeginLoc);
// In case the tokens were cached, have Preprocessor replace
// them with the annotation token.
PP.AnnotateCachedTokens(Tok);
return false;
}
if (!getLangOpts().CPlusPlus) {
// If we're in C, we can't have :: tokens at all (the lexer won't return
// them). If the identifier is not a type, then it can't be scope either,
// just early exit.
return false;
}
// If this is a template-id, annotate with a template-id or type token.
// FIXME: This appears to be dead code. We already have formed template-id
// tokens when parsing the scope specifier; this can never form a new one.
if (NextToken().is(tok::less)) {
TemplateTy Template;
UnqualifiedId TemplateName;
TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
bool MemberOfUnknownSpecialization;
if (TemplateNameKind TNK = Actions.isTemplateName(
getCurScope(), SS,
/*hasTemplateKeyword=*/false, TemplateName,
/*ObjectType=*/nullptr, /*EnteringContext*/false, Template,
MemberOfUnknownSpecialization)) {
// Only annotate an undeclared template name as a template-id if the
// following tokens have the form of a template argument list.
if (TNK != TNK_Undeclared_template ||
isTemplateArgumentList(1) != TPResult::False) {
// Consume the identifier.
ConsumeToken();
if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
TemplateName)) {
// If an unrecoverable error occurred, we need to return true here,
// because the token stream is in a damaged state. We may not
// return a valid identifier.
return true;
}
}
}
}
// The current token, which is either an identifier or a
// template-id, is not part of the annotation. Fall through to
// push that token back into the stream and complete the C++ scope
// specifier annotation.
}
if (Tok.is(tok::annot_template_id)) {
TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
if (TemplateId->Kind == TNK_Type_template) {
// A template-id that refers to a type was parsed into a
// template-id annotation in a context where we weren't allowed
// to produce a type annotation token. Update the template-id
// annotation token to a type annotation token now.
AnnotateTemplateIdTokenAsType();
return false;
}
}
if (SS.isEmpty())
return false;
// A C++ scope specifier that isn't followed by a typename.
AnnotateScopeToken(SS, IsNewScope);
return false;
}
/// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only
/// annotates C++ scope specifiers and template-ids. This returns
/// true if there was an error that could not be recovered from.
///
/// Note that this routine emits an error if you call it with ::new or ::delete
/// as the current tokens, so only call it in contexts where these are invalid.
bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) {
assert(getLangOpts().CPlusPlus &&
"Call sites of this function should be guarded by checking for C++");
assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
(Tok.is(tok::annot_template_id) && NextToken().is(tok::coloncolon)) ||
Tok.is(tok::kw_decltype) || Tok.is(tok::kw___super)) &&
"Cannot be a type or scope token!");
CXXScopeSpec SS;
if (ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
return true;
if (SS.isEmpty())
return false;
AnnotateScopeToken(SS, true);
return false;
}
bool Parser::isTokenEqualOrEqualTypo() {
tok::TokenKind Kind = Tok.getKind();
switch (Kind) {
default:
return false;
case tok::ampequal: // &=
case tok::starequal: // *=
case tok::plusequal: // +=
case tok::minusequal: // -=
case tok::exclaimequal: // !=
case tok::slashequal: // /=
case tok::percentequal: // %=
case tok::lessequal: // <=
case tok::lesslessequal: // <<=
case tok::greaterequal: // >=
case tok::greatergreaterequal: // >>=
case tok::caretequal: // ^=
case tok::pipeequal: // |=
case tok::equalequal: // ==
Diag(Tok, diag::err_invalid_token_after_declarator_suggest_equal)
<< Kind
<< FixItHint::CreateReplacement(SourceRange(Tok.getLocation()), "=");
LLVM_FALLTHROUGH;
case tok::equal:
return true;
}
}
SourceLocation Parser::handleUnexpectedCodeCompletionToken() {
assert(Tok.is(tok::code_completion));
PrevTokLocation = Tok.getLocation();
for (Scope *S = getCurScope(); S; S = S->getParent()) {
if (S->getFlags() & Scope::FnScope) {
Actions.CodeCompleteOrdinaryName(getCurScope(),
Sema::PCC_RecoveryInFunction);
cutOffParsing();
return PrevTokLocation;
}
if (S->getFlags() & Scope::ClassScope) {
Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Class);
cutOffParsing();
return PrevTokLocation;
}
}
Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Namespace);
cutOffParsing();
return PrevTokLocation;
}
// Code-completion pass-through functions
void Parser::CodeCompleteDirective(bool InConditional) {
Actions.CodeCompletePreprocessorDirective(InConditional);
}
void Parser::CodeCompleteInConditionalExclusion() {
Actions.CodeCompleteInPreprocessorConditionalExclusion(getCurScope());
}
void Parser::CodeCompleteMacroName(bool IsDefinition) {
Actions.CodeCompletePreprocessorMacroName(IsDefinition);
}
void Parser::CodeCompletePreprocessorExpression() {
Actions.CodeCompletePreprocessorExpression();
}
void Parser::CodeCompleteMacroArgument(IdentifierInfo *Macro,
MacroInfo *MacroInfo,
unsigned ArgumentIndex) {
Actions.CodeCompletePreprocessorMacroArgument(getCurScope(), Macro, MacroInfo,
ArgumentIndex);
}
void Parser::CodeCompleteIncludedFile(llvm::StringRef Dir, bool IsAngled) {
Actions.CodeCompleteIncludedFile(Dir, IsAngled);
}
void Parser::CodeCompleteNaturalLanguage() {
Actions.CodeCompleteNaturalLanguage();
}
bool Parser::ParseMicrosoftIfExistsCondition(IfExistsCondition& Result) {
assert((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists)) &&
"Expected '__if_exists' or '__if_not_exists'");
Result.IsIfExists = Tok.is(tok::kw___if_exists);
Result.KeywordLoc = ConsumeToken();
BalancedDelimiterTracker T(*this, tok::l_paren);
if (T.consumeOpen()) {
Diag(Tok, diag::err_expected_lparen_after)
<< (Result.IsIfExists? "__if_exists" : "__if_not_exists");
return true;
}
// Parse nested-name-specifier.
if (getLangOpts().CPlusPlus)
ParseOptionalCXXScopeSpecifier(Result.SS, nullptr,
/*EnteringContext=*/false);
// Check nested-name specifier.
if (Result.SS.isInvalid()) {
T.skipToEnd();
return true;
}
// Parse the unqualified-id.
SourceLocation TemplateKWLoc; // FIXME: parsed, but unused.
if (ParseUnqualifiedId(
Result.SS, /*EnteringContext*/false, /*AllowDestructorName*/true,
/*AllowConstructorName*/true, /*AllowDeductionGuide*/false, nullptr,
&TemplateKWLoc, Result.Name)) {
T.skipToEnd();
return true;
}
if (T.consumeClose())
return true;
// Check if the symbol exists.
switch (Actions.CheckMicrosoftIfExistsSymbol(getCurScope(), Result.KeywordLoc,
Result.IsIfExists, Result.SS,
Result.Name)) {
case Sema::IER_Exists:
Result.Behavior = Result.IsIfExists ? IEB_Parse : IEB_Skip;
break;
case Sema::IER_DoesNotExist:
Result.Behavior = !Result.IsIfExists ? IEB_Parse : IEB_Skip;
break;
case Sema::IER_Dependent:
Result.Behavior = IEB_Dependent;
break;
case Sema::IER_Error:
return true;
}
return false;
}
void Parser::ParseMicrosoftIfExistsExternalDeclaration() {
IfExistsCondition Result;
if (ParseMicrosoftIfExistsCondition(Result))
return;
BalancedDelimiterTracker Braces(*this, tok::l_brace);
if (Braces.consumeOpen()) {
Diag(Tok, diag::err_expected) << tok::l_brace;
return;
}
switch (Result.Behavior) {
case IEB_Parse:
// Parse declarations below.
break;
case IEB_Dependent:
llvm_unreachable("Cannot have a dependent external declaration");
case IEB_Skip:
Braces.skipToEnd();
return;
}
// Parse the declarations.
// FIXME: Support module import within __if_exists?
while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
ParsedAttributesWithRange attrs(AttrFactory);
MaybeParseCXX11Attributes(attrs);
DeclGroupPtrTy Result = ParseExternalDeclaration(attrs);
if (Result && !getCurScope()->getParent())
Actions.getASTConsumer().HandleTopLevelDecl(Result.get());
}
Braces.consumeClose();
}
/// Parse a declaration beginning with the 'module' keyword or C++20
/// context-sensitive keyword (optionally preceded by 'export').
///
/// module-declaration: [Modules TS + P0629R0]
/// 'export'[opt] 'module' module-name attribute-specifier-seq[opt] ';'
///
/// global-module-fragment: [C++2a]
/// 'module' ';' top-level-declaration-seq[opt]
/// module-declaration: [C++2a]
/// 'export'[opt] 'module' module-name module-partition[opt]
/// attribute-specifier-seq[opt] ';'
/// private-module-fragment: [C++2a]
/// 'module' ':' 'private' ';' top-level-declaration-seq[opt]
Parser::DeclGroupPtrTy Parser::ParseModuleDecl(bool IsFirstDecl) {
SourceLocation StartLoc = Tok.getLocation();
Sema::ModuleDeclKind MDK = TryConsumeToken(tok::kw_export)
? Sema::ModuleDeclKind::Interface
: Sema::ModuleDeclKind::Implementation;
assert(
(Tok.is(tok::kw_module) ||
(Tok.is(tok::identifier) && Tok.getIdentifierInfo() == Ident_module)) &&
"not a module declaration");
SourceLocation ModuleLoc = ConsumeToken();
// Attributes appear after the module name, not before.
// FIXME: Suggest moving the attributes later with a fixit.
DiagnoseAndSkipCXX11Attributes();
// Parse a global-module-fragment, if present.
if (getLangOpts().CPlusPlusModules && Tok.is(tok::semi)) {
SourceLocation SemiLoc = ConsumeToken();
if (!IsFirstDecl) {
Diag(StartLoc, diag::err_global_module_introducer_not_at_start)
<< SourceRange(StartLoc, SemiLoc);
return nullptr;
}
if (MDK == Sema::ModuleDeclKind::Interface) {
Diag(StartLoc, diag::err_module_fragment_exported)
<< /*global*/0 << FixItHint::CreateRemoval(StartLoc);
}
return Actions.ActOnGlobalModuleFragmentDecl(ModuleLoc);
}
// Parse a private-module-fragment, if present.
if (getLangOpts().CPlusPlusModules && Tok.is(tok::colon) &&
NextToken().is(tok::kw_private)) {
if (MDK == Sema::ModuleDeclKind::Interface) {
Diag(StartLoc, diag::err_module_fragment_exported)
<< /*private*/1 << FixItHint::CreateRemoval(StartLoc);
}
ConsumeToken();
SourceLocation PrivateLoc = ConsumeToken();
DiagnoseAndSkipCXX11Attributes();
ExpectAndConsumeSemi(diag::err_private_module_fragment_expected_semi);
return Actions.ActOnPrivateModuleFragmentDecl(ModuleLoc, PrivateLoc);
}
SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
if (ParseModuleName(ModuleLoc, Path, /*IsImport*/false))
return nullptr;
// Parse the optional module-partition.
if (Tok.is(tok::colon)) {
SourceLocation ColonLoc = ConsumeToken();
SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Partition;
if (ParseModuleName(ModuleLoc, Partition, /*IsImport*/false))
return nullptr;
// FIXME: Support module partition declarations.
Diag(ColonLoc, diag::err_unsupported_module_partition)
<< SourceRange(ColonLoc, Partition.back().second);
// Recover by parsing as a non-partition.
}
// We don't support any module attributes yet; just parse them and diagnose.
ParsedAttributesWithRange Attrs(AttrFactory);
MaybeParseCXX11Attributes(Attrs);
ProhibitCXX11Attributes(Attrs, diag::err_attribute_not_module_attr);
ExpectAndConsumeSemi(diag::err_module_expected_semi);
return Actions.ActOnModuleDecl(StartLoc, ModuleLoc, MDK, Path, IsFirstDecl);
}
/// Parse a module import declaration. This is essentially the same for
/// Objective-C and the C++ Modules TS, except for the leading '@' (in ObjC)
/// and the trailing optional attributes (in C++).
///
/// [ObjC] @import declaration:
/// '@' 'import' module-name ';'
/// [ModTS] module-import-declaration:
/// 'import' module-name attribute-specifier-seq[opt] ';'
/// [C++2a] module-import-declaration:
/// 'export'[opt] 'import' module-name
/// attribute-specifier-seq[opt] ';'
/// 'export'[opt] 'import' module-partition
/// attribute-specifier-seq[opt] ';'
/// 'export'[opt] 'import' header-name
/// attribute-specifier-seq[opt] ';'
Decl *Parser::ParseModuleImport(SourceLocation AtLoc) {
SourceLocation StartLoc = AtLoc.isInvalid() ? Tok.getLocation() : AtLoc;
SourceLocation ExportLoc;
TryConsumeToken(tok::kw_export, ExportLoc);
assert((AtLoc.isInvalid() ? Tok.isOneOf(tok::kw_import, tok::identifier)
: Tok.isObjCAtKeyword(tok::objc_import)) &&
"Improper start to module import");
bool IsObjCAtImport = Tok.isObjCAtKeyword(tok::objc_import);
SourceLocation ImportLoc = ConsumeToken();
SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
Module *HeaderUnit = nullptr;
if (Tok.is(tok::header_name)) {
// This is a header import that the preprocessor decided we should skip
// because it was malformed in some way. Parse and ignore it; it's already
// been diagnosed.
ConsumeToken();
} else if (Tok.is(tok::annot_header_unit)) {
// This is a header import that the preprocessor mapped to a module import.
HeaderUnit = reinterpret_cast<Module *>(Tok.getAnnotationValue());
ConsumeAnnotationToken();
} else if (getLangOpts().CPlusPlusModules && Tok.is(tok::colon)) {
SourceLocation ColonLoc = ConsumeToken();
if (ParseModuleName(ImportLoc, Path, /*IsImport*/true))
return nullptr;
// FIXME: Support module partition import.
Diag(ColonLoc, diag::err_unsupported_module_partition)
<< SourceRange(ColonLoc, Path.back().second);
return nullptr;
} else {
if (ParseModuleName(ImportLoc, Path, /*IsImport*/true))
return nullptr;
}
ParsedAttributesWithRange Attrs(AttrFactory);
MaybeParseCXX11Attributes(Attrs);
// We don't support any module import attributes yet.
ProhibitCXX11Attributes(Attrs, diag::err_attribute_not_import_attr);
if (PP.hadModuleLoaderFatalFailure()) {
// With a fatal failure in the module loader, we abort parsing.
cutOffParsing();
return nullptr;
}
DeclResult Import;
if (HeaderUnit)
Import =
Actions.ActOnModuleImport(StartLoc, ExportLoc, ImportLoc, HeaderUnit);
else if (!Path.empty())
Import = Actions.ActOnModuleImport(StartLoc, ExportLoc, ImportLoc, Path);
ExpectAndConsumeSemi(diag::err_module_expected_semi);
if (Import.isInvalid())
return nullptr;
// Using '@import' in framework headers requires modules to be enabled so that
// the header is parseable. Emit a warning to make the user aware.
if (IsObjCAtImport && AtLoc.isValid()) {
auto &SrcMgr = PP.getSourceManager();
auto *FE = SrcMgr.getFileEntryForID(SrcMgr.getFileID(AtLoc));
if (FE && llvm::sys::path::parent_path(FE->getDir()->getName())
.endswith(".framework"))
Diags.Report(AtLoc, diag::warn_atimport_in_framework_header);
}
return Import.get();
}
/// Parse a C++ Modules TS / Objective-C module name (both forms use the same
/// grammar).
///
/// module-name:
/// module-name-qualifier[opt] identifier
/// module-name-qualifier:
/// module-name-qualifier[opt] identifier '.'
bool Parser::ParseModuleName(
SourceLocation UseLoc,
SmallVectorImpl<std::pair<IdentifierInfo *, SourceLocation>> &Path,
bool IsImport) {
// Parse the module path.
while (true) {
if (!Tok.is(tok::identifier)) {
if (Tok.is(tok::code_completion)) {
Actions.CodeCompleteModuleImport(UseLoc, Path);
cutOffParsing();
return true;
}
Diag(Tok, diag::err_module_expected_ident) << IsImport;
SkipUntil(tok::semi);
return true;
}
// Record this part of the module path.
Path.push_back(std::make_pair(Tok.getIdentifierInfo(), Tok.getLocation()));
ConsumeToken();
if (Tok.isNot(tok::period))
return false;
ConsumeToken();
}
}
/// Try recover parser when module annotation appears where it must not
/// be found.
/// \returns false if the recover was successful and parsing may be continued, or
/// true if parser must bail out to top level and handle the token there.
bool Parser::parseMisplacedModuleImport() {
while (true) {
switch (Tok.getKind()) {
case tok::annot_module_end:
// If we recovered from a misplaced module begin, we expect to hit a
// misplaced module end too. Stay in the current context when this
// happens.
if (MisplacedModuleBeginCount) {
--MisplacedModuleBeginCount;
Actions.ActOnModuleEnd(Tok.getLocation(),
reinterpret_cast<Module *>(
Tok.getAnnotationValue()));
ConsumeAnnotationToken();
continue;
}
// Inform caller that recovery failed, the error must be handled at upper
// level. This will generate the desired "missing '}' at end of module"
// diagnostics on the way out.
return true;
case tok::annot_module_begin:
// Recover by entering the module (Sema will diagnose).
Actions.ActOnModuleBegin(Tok.getLocation(),
reinterpret_cast<Module *>(
Tok.getAnnotationValue()));
ConsumeAnnotationToken();
++MisplacedModuleBeginCount;
continue;
case tok::annot_module_include:
// Module import found where it should not be, for instance, inside a
// namespace. Recover by importing the module.
Actions.ActOnModuleInclude(Tok.getLocation(),
reinterpret_cast<Module *>(
Tok.getAnnotationValue()));
ConsumeAnnotationToken();
// If there is another module import, process it.
continue;
default:
return false;
}
}
return false;
}
bool BalancedDelimiterTracker::diagnoseOverflow() {
P.Diag(P.Tok, diag::err_bracket_depth_exceeded)
<< P.getLangOpts().BracketDepth;
P.Diag(P.Tok, diag::note_bracket_depth);
P.cutOffParsing();
return true;
}
bool BalancedDelimiterTracker::expectAndConsume(unsigned DiagID,
const char *Msg,
tok::TokenKind SkipToTok) {
LOpen = P.Tok.getLocation();
if (P.ExpectAndConsume(Kind, DiagID, Msg)) {
if (SkipToTok != tok::unknown)
P.SkipUntil(SkipToTok, Parser::StopAtSemi);
return true;
}
if (getDepth() < P.getLangOpts().BracketDepth)
return false;
return diagnoseOverflow();
}
bool BalancedDelimiterTracker::diagnoseMissingClose() {
assert(!P.Tok.is(Close) && "Should have consumed closing delimiter");
if (P.Tok.is(tok::annot_module_end))
P.Diag(P.Tok, diag::err_missing_before_module_end) << Close;
else
P.Diag(P.Tok, diag::err_expected) << Close;
P.Diag(LOpen, diag::note_matching) << Kind;
// If we're not already at some kind of closing bracket, skip to our closing
// token.
if (P.Tok.isNot(tok::r_paren) && P.Tok.isNot(tok::r_brace) &&
P.Tok.isNot(tok::r_square) &&
P.SkipUntil(Close, FinalToken,
Parser::StopAtSemi | Parser::StopBeforeMatch) &&
P.Tok.is(Close))
LClose = P.ConsumeAnyToken();
return true;
}
void BalancedDelimiterTracker::skipToEnd() {
P.SkipUntil(Close, Parser::StopBeforeMatch);
consumeClose();
}