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632fba3cb2
teak-llvm/clang/lib/Sema/SemaLambda.cpp
Faisal Vali 632fba3cb2 Remove the circular reference to LambdaExpr in CXXRecordDecl. 
Both Doug and Richard had asked me to remove the circular reference in CXXRecordDecl to LambdaExpr by factoring out and storing the needed information from LambdaExpr directly into CXXRecordDecl.

No change in functionality. 

In addition, I have added an IsGenericLambda flag - this makes life a little easier when we implement capturing, and are Sema-analyzing the body of a lambda (and the calloperator hasn't been wired to the closure class yet). Any inner lambdas can have potential captures that could require walking up the scope chain and checking if any generic lambdas are capture-ready. This 'bit' makes some of that checking easier. 

This patch was approved by Doug with minor modifications (comments were cleaned up, and all data members were converted from bool/enum to unsigned, as requested): 
http://llvm-reviews.chandlerc.com/D1856

Thanks!

llvm-svn: 193223
2013-10-23 02:59:27 +00:00

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//===--- SemaLambda.cpp - Semantic Analysis for C++11 Lambdas -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements semantic analysis for C++ lambda expressions.
//
//===----------------------------------------------------------------------===//
#include "clang/Sema/DeclSpec.h"
#include "clang/AST/ASTLambda.h"
#include "clang/AST/ExprCXX.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Sema/Initialization.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/Scope.h"
#include "clang/Sema/ScopeInfo.h"
#include "clang/Sema/SemaInternal.h"
#include "TypeLocBuilder.h"
using namespace clang;
using namespace sema;
static inline TemplateParameterList *
getGenericLambdaTemplateParameterList(LambdaScopeInfo *LSI, Sema &SemaRef) {
if (LSI->GLTemplateParameterList)
return LSI->GLTemplateParameterList;
if (LSI->AutoTemplateParams.size()) {
SourceRange IntroRange = LSI->IntroducerRange;
SourceLocation LAngleLoc = IntroRange.getBegin();
SourceLocation RAngleLoc = IntroRange.getEnd();
LSI->GLTemplateParameterList = TemplateParameterList::Create(
SemaRef.Context,
/*Template kw loc*/SourceLocation(),
LAngleLoc,
(NamedDecl**)LSI->AutoTemplateParams.data(),
LSI->AutoTemplateParams.size(), RAngleLoc);
}
return LSI->GLTemplateParameterList;
}
CXXRecordDecl *Sema::createLambdaClosureType(SourceRange IntroducerRange,
TypeSourceInfo *Info,
bool KnownDependent,
LambdaCaptureDefault CaptureDefault) {
DeclContext *DC = CurContext;
while (!(DC->isFunctionOrMethod() || DC->isRecord() || DC->isFileContext()))
DC = DC->getParent();
bool IsGenericLambda = getGenericLambdaTemplateParameterList(getCurLambda(),
*this);
// Start constructing the lambda class.
CXXRecordDecl *Class = CXXRecordDecl::CreateLambda(Context, DC, Info,
IntroducerRange.getBegin(),
KnownDependent,
IsGenericLambda,
CaptureDefault);
DC->addDecl(Class);
return Class;
}
/// \brief Determine whether the given context is or is enclosed in an inline
/// function.
static bool isInInlineFunction(const DeclContext *DC) {
while (!DC->isFileContext()) {
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(DC))
if (FD->isInlined())
return true;
DC = DC->getLexicalParent();
}
return false;
}
MangleNumberingContext *
Sema::getCurrentMangleNumberContext(const DeclContext *DC,
Decl *&ManglingContextDecl) {
// Compute the context for allocating mangling numbers in the current
// expression, if the ABI requires them.
ManglingContextDecl = ExprEvalContexts.back().ManglingContextDecl;
enum ContextKind {
Normal,
DefaultArgument,
DataMember,
StaticDataMember
} Kind = Normal;
// Default arguments of member function parameters that appear in a class
// definition, as well as the initializers of data members, receive special
// treatment. Identify them.
if (ManglingContextDecl) {
if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(ManglingContextDecl)) {
if (const DeclContext *LexicalDC
= Param->getDeclContext()->getLexicalParent())
if (LexicalDC->isRecord())
Kind = DefaultArgument;
} else if (VarDecl *Var = dyn_cast<VarDecl>(ManglingContextDecl)) {
if (Var->getDeclContext()->isRecord())
Kind = StaticDataMember;
} else if (isa<FieldDecl>(ManglingContextDecl)) {
Kind = DataMember;
}
}
// Itanium ABI [5.1.7]:
// In the following contexts [...] the one-definition rule requires closure
// types in different translation units to "correspond":
bool IsInNonspecializedTemplate =
!ActiveTemplateInstantiations.empty() || CurContext->isDependentContext();
switch (Kind) {
case Normal:
// -- the bodies of non-exported nonspecialized template functions
// -- the bodies of inline functions
if ((IsInNonspecializedTemplate &&
!(ManglingContextDecl && isa<ParmVarDecl>(ManglingContextDecl))) ||
isInInlineFunction(CurContext)) {
ManglingContextDecl = 0;
return &Context.getManglingNumberContext(DC);
}
ManglingContextDecl = 0;
return 0;
case StaticDataMember:
// -- the initializers of nonspecialized static members of template classes
if (!IsInNonspecializedTemplate) {
ManglingContextDecl = 0;
return 0;
}
// Fall through to get the current context.
case DataMember:
// -- the in-class initializers of class members
case DefaultArgument:
// -- default arguments appearing in class definitions
return &ExprEvalContexts.back().getMangleNumberingContext(Context);
}
llvm_unreachable("unexpected context");
}
MangleNumberingContext &
Sema::ExpressionEvaluationContextRecord::getMangleNumberingContext(
ASTContext &Ctx) {
assert(ManglingContextDecl && "Need to have a context declaration");
if (!MangleNumbering)
MangleNumbering = Ctx.createMangleNumberingContext();
return *MangleNumbering;
}
CXXMethodDecl *Sema::startLambdaDefinition(CXXRecordDecl *Class,
SourceRange IntroducerRange,
TypeSourceInfo *MethodTypeInfo,
SourceLocation EndLoc,
ArrayRef<ParmVarDecl *> Params) {
QualType MethodType = MethodTypeInfo->getType();
TemplateParameterList *TemplateParams =
getGenericLambdaTemplateParameterList(getCurLambda(), *this);
// If a lambda appears in a dependent context or is a generic lambda (has
// template parameters) and has an 'auto' return type, deduce it to a
// dependent type.
if (Class->isDependentContext() || TemplateParams) {
const FunctionProtoType *FPT = MethodType->castAs<FunctionProtoType>();
QualType Result = FPT->getResultType();
if (Result->isUndeducedType()) {
Result = SubstAutoType(Result, Context.DependentTy);
MethodType = Context.getFunctionType(Result, FPT->getArgTypes(),
FPT->getExtProtoInfo());
}
}
// C++11 [expr.prim.lambda]p5:
// The closure type for a lambda-expression has a public inline function
// call operator (13.5.4) whose parameters and return type are described by
// the lambda-expression's parameter-declaration-clause and
// trailing-return-type respectively.
DeclarationName MethodName
= Context.DeclarationNames.getCXXOperatorName(OO_Call);
DeclarationNameLoc MethodNameLoc;
MethodNameLoc.CXXOperatorName.BeginOpNameLoc
= IntroducerRange.getBegin().getRawEncoding();
MethodNameLoc.CXXOperatorName.EndOpNameLoc
= IntroducerRange.getEnd().getRawEncoding();
CXXMethodDecl *Method
= CXXMethodDecl::Create(Context, Class, EndLoc,
DeclarationNameInfo(MethodName,
IntroducerRange.getBegin(),
MethodNameLoc),
MethodType, MethodTypeInfo,
SC_None,
/*isInline=*/true,
/*isConstExpr=*/false,
EndLoc);
Method->setAccess(AS_public);
// Temporarily set the lexical declaration context to the current
// context, so that the Scope stack matches the lexical nesting.
Method->setLexicalDeclContext(CurContext);
// Create a function template if we have a template parameter list
FunctionTemplateDecl *const TemplateMethod = TemplateParams ?
FunctionTemplateDecl::Create(Context, Class,
Method->getLocation(), MethodName,
TemplateParams,
Method) : 0;
if (TemplateMethod) {
TemplateMethod->setLexicalDeclContext(CurContext);
TemplateMethod->setAccess(AS_public);
Method->setDescribedFunctionTemplate(TemplateMethod);
}
// Add parameters.
if (!Params.empty()) {
Method->setParams(Params);
CheckParmsForFunctionDef(const_cast<ParmVarDecl **>(Params.begin()),
const_cast<ParmVarDecl **>(Params.end()),
/*CheckParameterNames=*/false);
for (CXXMethodDecl::param_iterator P = Method->param_begin(),
PEnd = Method->param_end();
P != PEnd; ++P)
(*P)->setOwningFunction(Method);
}
Decl *ManglingContextDecl;
if (MangleNumberingContext *MCtx =
getCurrentMangleNumberContext(Class->getDeclContext(),
ManglingContextDecl)) {
unsigned ManglingNumber = MCtx->getManglingNumber(Method);
Class->setLambdaMangling(ManglingNumber, ManglingContextDecl);
}
return Method;
}
void Sema::buildLambdaScope(LambdaScopeInfo *LSI,
CXXMethodDecl *CallOperator,
SourceRange IntroducerRange,
LambdaCaptureDefault CaptureDefault,
SourceLocation CaptureDefaultLoc,
bool ExplicitParams,
bool ExplicitResultType,
bool Mutable) {
LSI->CallOperator = CallOperator;
CXXRecordDecl *LambdaClass = CallOperator->getParent();
LSI->Lambda = LambdaClass;
if (CaptureDefault == LCD_ByCopy)
LSI->ImpCaptureStyle = LambdaScopeInfo::ImpCap_LambdaByval;
else if (CaptureDefault == LCD_ByRef)
LSI->ImpCaptureStyle = LambdaScopeInfo::ImpCap_LambdaByref;
LSI->CaptureDefaultLoc = CaptureDefaultLoc;
LSI->IntroducerRange = IntroducerRange;
LSI->ExplicitParams = ExplicitParams;
LSI->Mutable = Mutable;
if (ExplicitResultType) {
LSI->ReturnType = CallOperator->getResultType();
if (!LSI->ReturnType->isDependentType() &&
!LSI->ReturnType->isVoidType()) {
if (RequireCompleteType(CallOperator->getLocStart(), LSI->ReturnType,
diag::err_lambda_incomplete_result)) {
// Do nothing.
}
}
} else {
LSI->HasImplicitReturnType = true;
}
}
void Sema::finishLambdaExplicitCaptures(LambdaScopeInfo *LSI) {
LSI->finishedExplicitCaptures();
}
void Sema::addLambdaParameters(CXXMethodDecl *CallOperator, Scope *CurScope) {
// Introduce our parameters into the function scope
for (unsigned p = 0, NumParams = CallOperator->getNumParams();
p < NumParams; ++p) {
ParmVarDecl *Param = CallOperator->getParamDecl(p);
// If this has an identifier, add it to the scope stack.
if (CurScope && Param->getIdentifier()) {
CheckShadow(CurScope, Param);
PushOnScopeChains(Param, CurScope);
}
}
}
/// If this expression is an enumerator-like expression of some type
/// T, return the type T; otherwise, return null.
///
/// Pointer comparisons on the result here should always work because
/// it's derived from either the parent of an EnumConstantDecl
/// (i.e. the definition) or the declaration returned by
/// EnumType::getDecl() (i.e. the definition).
static EnumDecl *findEnumForBlockReturn(Expr *E) {
// An expression is an enumerator-like expression of type T if,
// ignoring parens and parens-like expressions:
E = E->IgnoreParens();
// - it is an enumerator whose enum type is T or
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
if (EnumConstantDecl *D
= dyn_cast<EnumConstantDecl>(DRE->getDecl())) {
return cast<EnumDecl>(D->getDeclContext());
}
return 0;
}
// - it is a comma expression whose RHS is an enumerator-like
// expression of type T or
if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
if (BO->getOpcode() == BO_Comma)
return findEnumForBlockReturn(BO->getRHS());
return 0;
}
// - it is a statement-expression whose value expression is an
// enumerator-like expression of type T or
if (StmtExpr *SE = dyn_cast<StmtExpr>(E)) {
if (Expr *last = dyn_cast_or_null<Expr>(SE->getSubStmt()->body_back()))
return findEnumForBlockReturn(last);
return 0;
}
// - it is a ternary conditional operator (not the GNU ?:
// extension) whose second and third operands are
// enumerator-like expressions of type T or
if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
if (EnumDecl *ED = findEnumForBlockReturn(CO->getTrueExpr()))
if (ED == findEnumForBlockReturn(CO->getFalseExpr()))
return ED;
return 0;
}
// (implicitly:)
// - it is an implicit integral conversion applied to an
// enumerator-like expression of type T or
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
// We can sometimes see integral conversions in valid
// enumerator-like expressions.
if (ICE->getCastKind() == CK_IntegralCast)
return findEnumForBlockReturn(ICE->getSubExpr());
// Otherwise, just rely on the type.
}
// - it is an expression of that formal enum type.
if (const EnumType *ET = E->getType()->getAs<EnumType>()) {
return ET->getDecl();
}
// Otherwise, nope.
return 0;
}
/// Attempt to find a type T for which the returned expression of the
/// given statement is an enumerator-like expression of that type.
static EnumDecl *findEnumForBlockReturn(ReturnStmt *ret) {
if (Expr *retValue = ret->getRetValue())
return findEnumForBlockReturn(retValue);
return 0;
}
/// Attempt to find a common type T for which all of the returned
/// expressions in a block are enumerator-like expressions of that
/// type.
static EnumDecl *findCommonEnumForBlockReturns(ArrayRef<ReturnStmt*> returns) {
ArrayRef<ReturnStmt*>::iterator i = returns.begin(), e = returns.end();
// Try to find one for the first return.
EnumDecl *ED = findEnumForBlockReturn(*i);
if (!ED) return 0;
// Check that the rest of the returns have the same enum.
for (++i; i != e; ++i) {
if (findEnumForBlockReturn(*i) != ED)
return 0;
}
// Never infer an anonymous enum type.
if (!ED->hasNameForLinkage()) return 0;
return ED;
}
/// Adjust the given return statements so that they formally return
/// the given type. It should require, at most, an IntegralCast.
static void adjustBlockReturnsToEnum(Sema &S, ArrayRef<ReturnStmt*> returns,
QualType returnType) {
for (ArrayRef<ReturnStmt*>::iterator
i = returns.begin(), e = returns.end(); i != e; ++i) {
ReturnStmt *ret = *i;
Expr *retValue = ret->getRetValue();
if (S.Context.hasSameType(retValue->getType(), returnType))
continue;
// Right now we only support integral fixup casts.
assert(returnType->isIntegralOrUnscopedEnumerationType());
assert(retValue->getType()->isIntegralOrUnscopedEnumerationType());
ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(retValue);
Expr *E = (cleanups ? cleanups->getSubExpr() : retValue);
E = ImplicitCastExpr::Create(S.Context, returnType, CK_IntegralCast,
E, /*base path*/ 0, VK_RValue);
if (cleanups) {
cleanups->setSubExpr(E);
} else {
ret->setRetValue(E);
}
}
}
void Sema::deduceClosureReturnType(CapturingScopeInfo &CSI) {
assert(CSI.HasImplicitReturnType);
// If it was ever a placeholder, it had to been deduced to DependentTy.
assert(CSI.ReturnType.isNull() || !CSI.ReturnType->isUndeducedType());
// C++ Core Issue #975, proposed resolution:
// If a lambda-expression does not include a trailing-return-type,
// it is as if the trailing-return-type denotes the following type:
// - if there are no return statements in the compound-statement,
// or all return statements return either an expression of type
// void or no expression or braced-init-list, the type void;
// - otherwise, if all return statements return an expression
// and the types of the returned expressions after
// lvalue-to-rvalue conversion (4.1 [conv.lval]),
// array-to-pointer conversion (4.2 [conv.array]), and
// function-to-pointer conversion (4.3 [conv.func]) are the
// same, that common type;
// - otherwise, the program is ill-formed.
//
// In addition, in blocks in non-C++ modes, if all of the return
// statements are enumerator-like expressions of some type T, where
// T has a name for linkage, then we infer the return type of the
// block to be that type.
// First case: no return statements, implicit void return type.
ASTContext &Ctx = getASTContext();
if (CSI.Returns.empty()) {
// It's possible there were simply no /valid/ return statements.
// In this case, the first one we found may have at least given us a type.
if (CSI.ReturnType.isNull())
CSI.ReturnType = Ctx.VoidTy;
return;
}
// Second case: at least one return statement has dependent type.
// Delay type checking until instantiation.
assert(!CSI.ReturnType.isNull() && "We should have a tentative return type.");
if (CSI.ReturnType->isDependentType())
return;
// Try to apply the enum-fuzz rule.
if (!getLangOpts().CPlusPlus) {
assert(isa<BlockScopeInfo>(CSI));
const EnumDecl *ED = findCommonEnumForBlockReturns(CSI.Returns);
if (ED) {
CSI.ReturnType = Context.getTypeDeclType(ED);
adjustBlockReturnsToEnum(*this, CSI.Returns, CSI.ReturnType);
return;
}
}
// Third case: only one return statement. Don't bother doing extra work!
SmallVectorImpl<ReturnStmt*>::iterator I = CSI.Returns.begin(),
E = CSI.Returns.end();
if (I+1 == E)
return;
// General case: many return statements.
// Check that they all have compatible return types.
// We require the return types to strictly match here.
// Note that we've already done the required promotions as part of
// processing the return statement.
for (; I != E; ++I) {
const ReturnStmt *RS = *I;
const Expr *RetE = RS->getRetValue();
QualType ReturnType = (RetE ? RetE->getType() : Context.VoidTy);
if (Context.hasSameType(ReturnType, CSI.ReturnType))
continue;
// FIXME: This is a poor diagnostic for ReturnStmts without expressions.
// TODO: It's possible that the *first* return is the divergent one.
Diag(RS->getLocStart(),
diag::err_typecheck_missing_return_type_incompatible)
<< ReturnType << CSI.ReturnType
<< isa<LambdaScopeInfo>(CSI);
// Continue iterating so that we keep emitting diagnostics.
}
}
VarDecl *Sema::checkInitCapture(SourceLocation Loc, bool ByRef,
IdentifierInfo *Id, Expr *Init) {
// C++1y [expr.prim.lambda]p11:
// An init-capture behaves as if it declares and explicitly captures
// a variable of the form
// "auto init-capture;"
QualType DeductType = Context.getAutoDeductType();
TypeLocBuilder TLB;
TLB.pushTypeSpec(DeductType).setNameLoc(Loc);
if (ByRef) {
DeductType = BuildReferenceType(DeductType, true, Loc, Id);
assert(!DeductType.isNull() && "can't build reference to auto");
TLB.push<ReferenceTypeLoc>(DeductType).setSigilLoc(Loc);
}
TypeSourceInfo *TSI = TLB.getTypeSourceInfo(Context, DeductType);
// Create a dummy variable representing the init-capture. This is not actually
// used as a variable, and only exists as a way to name and refer to the
// init-capture.
// FIXME: Pass in separate source locations for '&' and identifier.
VarDecl *NewVD = VarDecl::Create(Context, CurContext, Loc,
Loc, Id, TSI->getType(), TSI, SC_Auto);
NewVD->setInitCapture(true);
NewVD->setReferenced(true);
NewVD->markUsed(Context);
// We do not need to distinguish between direct-list-initialization
// and copy-list-initialization here, because we will always deduce
// std::initializer_list<T>, and direct- and copy-list-initialization
// always behave the same for such a type.
// FIXME: We should model whether an '=' was present.
bool DirectInit = isa<ParenListExpr>(Init) || isa<InitListExpr>(Init);
AddInitializerToDecl(NewVD, Init, DirectInit, /*ContainsAuto*/true);
return NewVD;
}
FieldDecl *Sema::buildInitCaptureField(LambdaScopeInfo *LSI, VarDecl *Var) {
FieldDecl *Field = FieldDecl::Create(
Context, LSI->Lambda, Var->getLocation(), Var->getLocation(),
0, Var->getType(), Var->getTypeSourceInfo(), 0, false, ICIS_NoInit);
Field->setImplicit(true);
Field->setAccess(AS_private);
LSI->Lambda->addDecl(Field);
LSI->addCapture(Var, /*isBlock*/false, Var->getType()->isReferenceType(),
/*isNested*/false, Var->getLocation(), SourceLocation(),
Var->getType(), Var->getInit());
return Field;
}
void Sema::ActOnStartOfLambdaDefinition(LambdaIntroducer &Intro,
Declarator &ParamInfo, Scope *CurScope) {
// Determine if we're within a context where we know that the lambda will
// be dependent, because there are template parameters in scope.
bool KnownDependent = false;
LambdaScopeInfo *const LSI = getCurLambda();
assert(LSI && "LambdaScopeInfo should be on stack!");
TemplateParameterList *TemplateParams =
getGenericLambdaTemplateParameterList(LSI, *this);
if (Scope *TmplScope = CurScope->getTemplateParamParent()) {
// Since we have our own TemplateParams, so check if an outer scope
// has template params, only then are we in a dependent scope.
if (TemplateParams) {
TmplScope = TmplScope->getParent();
TmplScope = TmplScope ? TmplScope->getTemplateParamParent() : 0;
}
if (TmplScope && !TmplScope->decl_empty())
KnownDependent = true;
}
// Determine the signature of the call operator.
TypeSourceInfo *MethodTyInfo;
bool ExplicitParams = true;
bool ExplicitResultType = true;
bool ContainsUnexpandedParameterPack = false;
SourceLocation EndLoc;
SmallVector<ParmVarDecl *, 8> Params;
if (ParamInfo.getNumTypeObjects() == 0) {
// C++11 [expr.prim.lambda]p4:
// If a lambda-expression does not include a lambda-declarator, it is as
// if the lambda-declarator were ().
FunctionProtoType::ExtProtoInfo EPI(Context.getDefaultCallingConvention(
/*IsVariadic=*/false, /*IsCXXMethod=*/true));
EPI.HasTrailingReturn = true;
EPI.TypeQuals |= DeclSpec::TQ_const;
// C++1y [expr.prim.lambda]:
// The lambda return type is 'auto', which is replaced by the
// trailing-return type if provided and/or deduced from 'return'
// statements
// We don't do this before C++1y, because we don't support deduced return
// types there.
QualType DefaultTypeForNoTrailingReturn =
getLangOpts().CPlusPlus1y ? Context.getAutoDeductType()
: Context.DependentTy;
QualType MethodTy =
Context.getFunctionType(DefaultTypeForNoTrailingReturn, None, EPI);
MethodTyInfo = Context.getTrivialTypeSourceInfo(MethodTy);
ExplicitParams = false;
ExplicitResultType = false;
EndLoc = Intro.Range.getEnd();
} else {
assert(ParamInfo.isFunctionDeclarator() &&
"lambda-declarator is a function");
DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getFunctionTypeInfo();
// C++11 [expr.prim.lambda]p5:
// This function call operator is declared const (9.3.1) if and only if
// the lambda-expression's parameter-declaration-clause is not followed
// by mutable. It is neither virtual nor declared volatile. [...]
if (!FTI.hasMutableQualifier())
FTI.TypeQuals |= DeclSpec::TQ_const;
MethodTyInfo = GetTypeForDeclarator(ParamInfo, CurScope);
assert(MethodTyInfo && "no type from lambda-declarator");
EndLoc = ParamInfo.getSourceRange().getEnd();
ExplicitResultType = FTI.hasTrailingReturnType();
if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) {
// Empty arg list, don't push any params.
checkVoidParamDecl(cast<ParmVarDecl>(FTI.ArgInfo[0].Param));
} else {
Params.reserve(FTI.NumArgs);
for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i)
Params.push_back(cast<ParmVarDecl>(FTI.ArgInfo[i].Param));
}
// Check for unexpanded parameter packs in the method type.
if (MethodTyInfo->getType()->containsUnexpandedParameterPack())
ContainsUnexpandedParameterPack = true;
}
CXXRecordDecl *Class = createLambdaClosureType(Intro.Range, MethodTyInfo,
KnownDependent, Intro.Default);
CXXMethodDecl *Method = startLambdaDefinition(Class, Intro.Range,
MethodTyInfo, EndLoc, Params);
if (ExplicitParams)
CheckCXXDefaultArguments(Method);
// Attributes on the lambda apply to the method.
ProcessDeclAttributes(CurScope, Method, ParamInfo);
// Introduce the function call operator as the current declaration context.
PushDeclContext(CurScope, Method);
// Build the lambda scope.
buildLambdaScope(LSI, Method,
Intro.Range,
Intro.Default, Intro.DefaultLoc,
ExplicitParams,
ExplicitResultType,
!Method->isConst());
// Distinct capture names, for diagnostics.
llvm::SmallSet<IdentifierInfo*, 8> CaptureNames;
// Handle explicit captures.
SourceLocation PrevCaptureLoc
= Intro.Default == LCD_None? Intro.Range.getBegin() : Intro.DefaultLoc;
for (SmallVectorImpl<LambdaCapture>::const_iterator
C = Intro.Captures.begin(),
E = Intro.Captures.end();
C != E;
PrevCaptureLoc = C->Loc, ++C) {
if (C->Kind == LCK_This) {
// C++11 [expr.prim.lambda]p8:
// An identifier or this shall not appear more than once in a
// lambda-capture.
if (LSI->isCXXThisCaptured()) {
Diag(C->Loc, diag::err_capture_more_than_once)
<< "'this'"
<< SourceRange(LSI->getCXXThisCapture().getLocation())
<< FixItHint::CreateRemoval(
SourceRange(PP.getLocForEndOfToken(PrevCaptureLoc), C->Loc));
continue;
}
// C++11 [expr.prim.lambda]p8:
// If a lambda-capture includes a capture-default that is =, the
// lambda-capture shall not contain this [...].
if (Intro.Default == LCD_ByCopy) {
Diag(C->Loc, diag::err_this_capture_with_copy_default)
<< FixItHint::CreateRemoval(
SourceRange(PP.getLocForEndOfToken(PrevCaptureLoc), C->Loc));
continue;
}
// C++11 [expr.prim.lambda]p12:
// If this is captured by a local lambda expression, its nearest
// enclosing function shall be a non-static member function.
QualType ThisCaptureType = getCurrentThisType();
if (ThisCaptureType.isNull()) {
Diag(C->Loc, diag::err_this_capture) << true;
continue;
}
CheckCXXThisCapture(C->Loc, /*Explicit=*/true);
continue;
}
assert(C->Id && "missing identifier for capture");
if (C->Init.isInvalid())
continue;
VarDecl *Var;
if (C->Init.isUsable()) {
Diag(C->Loc, getLangOpts().CPlusPlus1y
? diag::warn_cxx11_compat_init_capture
: diag::ext_init_capture);
if (C->Init.get()->containsUnexpandedParameterPack())
ContainsUnexpandedParameterPack = true;
Var = checkInitCapture(C->Loc, C->Kind == LCK_ByRef,
C->Id, C->Init.take());
// C++1y [expr.prim.lambda]p11:
// An init-capture behaves as if it declares and explicitly
// captures a variable [...] whose declarative region is the
// lambda-expression's compound-statement
if (Var)
PushOnScopeChains(Var, CurScope, false);
} else {
// C++11 [expr.prim.lambda]p8:
// If a lambda-capture includes a capture-default that is &, the
// identifiers in the lambda-capture shall not be preceded by &.
// If a lambda-capture includes a capture-default that is =, [...]
// each identifier it contains shall be preceded by &.
if (C->Kind == LCK_ByRef && Intro.Default == LCD_ByRef) {
Diag(C->Loc, diag::err_reference_capture_with_reference_default)
<< FixItHint::CreateRemoval(
SourceRange(PP.getLocForEndOfToken(PrevCaptureLoc), C->Loc));
continue;
} else if (C->Kind == LCK_ByCopy && Intro.Default == LCD_ByCopy) {
Diag(C->Loc, diag::err_copy_capture_with_copy_default)
<< FixItHint::CreateRemoval(
SourceRange(PP.getLocForEndOfToken(PrevCaptureLoc), C->Loc));
continue;
}
// C++11 [expr.prim.lambda]p10:
// The identifiers in a capture-list are looked up using the usual
// rules for unqualified name lookup (3.4.1)
DeclarationNameInfo Name(C->Id, C->Loc);
LookupResult R(*this, Name, LookupOrdinaryName);
LookupName(R, CurScope);
if (R.isAmbiguous())
continue;
if (R.empty()) {
// FIXME: Disable corrections that would add qualification?
CXXScopeSpec ScopeSpec;
DeclFilterCCC<VarDecl> Validator;
if (DiagnoseEmptyLookup(CurScope, ScopeSpec, R, Validator))
continue;
}
Var = R.getAsSingle<VarDecl>();
}
// C++11 [expr.prim.lambda]p8:
// An identifier or this shall not appear more than once in a
// lambda-capture.
if (!CaptureNames.insert(C->Id)) {
if (Var && LSI->isCaptured(Var)) {
Diag(C->Loc, diag::err_capture_more_than_once)
<< C->Id << SourceRange(LSI->getCapture(Var).getLocation())
<< FixItHint::CreateRemoval(
SourceRange(PP.getLocForEndOfToken(PrevCaptureLoc), C->Loc));
} else
// Previous capture captured something different (one or both was
// an init-cpature): no fixit.
Diag(C->Loc, diag::err_capture_more_than_once) << C->Id;
continue;
}
// C++11 [expr.prim.lambda]p10:
// [...] each such lookup shall find a variable with automatic storage
// duration declared in the reaching scope of the local lambda expression.
// Note that the 'reaching scope' check happens in tryCaptureVariable().
if (!Var) {
Diag(C->Loc, diag::err_capture_does_not_name_variable) << C->Id;
continue;
}
// Ignore invalid decls; they'll just confuse the code later.
if (Var->isInvalidDecl())
continue;
if (!Var->hasLocalStorage()) {
Diag(C->Loc, diag::err_capture_non_automatic_variable) << C->Id;
Diag(Var->getLocation(), diag::note_previous_decl) << C->Id;
continue;
}
// C++11 [expr.prim.lambda]p23:
// A capture followed by an ellipsis is a pack expansion (14.5.3).
SourceLocation EllipsisLoc;
if (C->EllipsisLoc.isValid()) {
if (Var->isParameterPack()) {
EllipsisLoc = C->EllipsisLoc;
} else {
Diag(C->EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
<< SourceRange(C->Loc);
// Just ignore the ellipsis.
}
} else if (Var->isParameterPack()) {
ContainsUnexpandedParameterPack = true;
}
if (C->Init.isUsable()) {
buildInitCaptureField(LSI, Var);
} else {
TryCaptureKind Kind = C->Kind == LCK_ByRef ? TryCapture_ExplicitByRef :
TryCapture_ExplicitByVal;
tryCaptureVariable(Var, C->Loc, Kind, EllipsisLoc);
}
}
finishLambdaExplicitCaptures(LSI);
LSI->ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack;
// Add lambda parameters into scope.
addLambdaParameters(Method, CurScope);
// Enter a new evaluation context to insulate the lambda from any
// cleanups from the enclosing full-expression.
PushExpressionEvaluationContext(PotentiallyEvaluated);
}
void Sema::ActOnLambdaError(SourceLocation StartLoc, Scope *CurScope,
bool IsInstantiation) {
// Leave the expression-evaluation context.
DiscardCleanupsInEvaluationContext();
PopExpressionEvaluationContext();
// Leave the context of the lambda.
if (!IsInstantiation)
PopDeclContext();
// Finalize the lambda.
LambdaScopeInfo *LSI = getCurLambda();
CXXRecordDecl *Class = LSI->Lambda;
Class->setInvalidDecl();
SmallVector<Decl*, 4> Fields;
for (RecordDecl::field_iterator i = Class->field_begin(),
e = Class->field_end(); i != e; ++i)
Fields.push_back(*i);
ActOnFields(0, Class->getLocation(), Class, Fields,
SourceLocation(), SourceLocation(), 0);
CheckCompletedCXXClass(Class);
PopFunctionScopeInfo();
}
/// \brief Add a lambda's conversion to function pointer, as described in
/// C++11 [expr.prim.lambda]p6.
static void addFunctionPointerConversion(Sema &S,
SourceRange IntroducerRange,
CXXRecordDecl *Class,
CXXMethodDecl *CallOperator) {
// Add the conversion to function pointer.
const FunctionProtoType *Proto
= CallOperator->getType()->getAs<FunctionProtoType>();
QualType FunctionPtrTy;
QualType FunctionTy;
{
FunctionProtoType::ExtProtoInfo ExtInfo = Proto->getExtProtoInfo();
CallingConv CC = S.Context.getDefaultCallingConvention(
Proto->isVariadic(), /*IsCXXMethod=*/false);
ExtInfo.ExtInfo = ExtInfo.ExtInfo.withCallingConv(CC);
ExtInfo.TypeQuals = 0;
FunctionTy = S.Context.getFunctionType(Proto->getResultType(),
Proto->getArgTypes(), ExtInfo);
FunctionPtrTy = S.Context.getPointerType(FunctionTy);
}
FunctionProtoType::ExtProtoInfo ExtInfo(S.Context.getDefaultCallingConvention(
/*IsVariadic=*/false, /*IsCXXMethod=*/true));
ExtInfo.TypeQuals = Qualifiers::Const;
QualType ConvTy = S.Context.getFunctionType(FunctionPtrTy, None, ExtInfo);
SourceLocation Loc = IntroducerRange.getBegin();
DeclarationName Name
= S.Context.DeclarationNames.getCXXConversionFunctionName(
S.Context.getCanonicalType(FunctionPtrTy));
DeclarationNameLoc NameLoc;
NameLoc.NamedType.TInfo = S.Context.getTrivialTypeSourceInfo(FunctionPtrTy,
Loc);
CXXConversionDecl *Conversion
= CXXConversionDecl::Create(S.Context, Class, Loc,
DeclarationNameInfo(Name, Loc, NameLoc),
ConvTy,
S.Context.getTrivialTypeSourceInfo(ConvTy,
Loc),
/*isInline=*/true, /*isExplicit=*/false,
/*isConstexpr=*/false,
CallOperator->getBody()->getLocEnd());
Conversion->setAccess(AS_public);
Conversion->setImplicit(true);
if (Class->isGenericLambda()) {
// Create a template version of the conversion operator, using the template
// parameter list of the function call operator.
FunctionTemplateDecl *TemplateCallOperator =
CallOperator->getDescribedFunctionTemplate();
FunctionTemplateDecl *ConversionTemplate =
FunctionTemplateDecl::Create(S.Context, Class,
Loc, Name,
TemplateCallOperator->getTemplateParameters(),
Conversion);
ConversionTemplate->setAccess(AS_public);
ConversionTemplate->setImplicit(true);
Conversion->setDescribedFunctionTemplate(ConversionTemplate);
Class->addDecl(ConversionTemplate);
} else
Class->addDecl(Conversion);
// Add a non-static member function that will be the result of
// the conversion with a certain unique ID.
Name = &S.Context.Idents.get(getLambdaStaticInvokerName());
// FIXME: Instead of passing in the CallOperator->getTypeSourceInfo()
// we should get a prebuilt TrivialTypeSourceInfo from Context
// using FunctionTy & Loc and get its TypeLoc as a FunctionProtoTypeLoc
// then rewire the parameters accordingly, by hoisting up the InvokeParams
// loop below and then use its Params to set Invoke->setParams(...) below.
// This would avoid the 'const' qualifier of the calloperator from
// contaminating the type of the invoker, which is currently adjusted
// in SemaTemplateDeduction.cpp:DeduceTemplateArguments.
CXXMethodDecl *Invoke
= CXXMethodDecl::Create(S.Context, Class, Loc,
DeclarationNameInfo(Name, Loc), FunctionTy,
CallOperator->getTypeSourceInfo(),
SC_Static, /*IsInline=*/true,
/*IsConstexpr=*/false,
CallOperator->getBody()->getLocEnd());
SmallVector<ParmVarDecl *, 4> InvokeParams;
for (unsigned I = 0, N = CallOperator->getNumParams(); I != N; ++I) {
ParmVarDecl *From = CallOperator->getParamDecl(I);
InvokeParams.push_back(ParmVarDecl::Create(S.Context, Invoke,
From->getLocStart(),
From->getLocation(),
From->getIdentifier(),
From->getType(),
From->getTypeSourceInfo(),
From->getStorageClass(),
/*DefaultArg=*/0));
}
Invoke->setParams(InvokeParams);
Invoke->setAccess(AS_private);
Invoke->setImplicit(true);
if (Class->isGenericLambda()) {
FunctionTemplateDecl *TemplateCallOperator =
CallOperator->getDescribedFunctionTemplate();
FunctionTemplateDecl *StaticInvokerTemplate = FunctionTemplateDecl::Create(
S.Context, Class, Loc, Name,
TemplateCallOperator->getTemplateParameters(),
Invoke);
StaticInvokerTemplate->setAccess(AS_private);
StaticInvokerTemplate->setImplicit(true);
Invoke->setDescribedFunctionTemplate(StaticInvokerTemplate);
Class->addDecl(StaticInvokerTemplate);
} else
Class->addDecl(Invoke);
}
/// \brief Add a lambda's conversion to block pointer.
static void addBlockPointerConversion(Sema &S,
SourceRange IntroducerRange,
CXXRecordDecl *Class,
CXXMethodDecl *CallOperator) {
const FunctionProtoType *Proto
= CallOperator->getType()->getAs<FunctionProtoType>();
QualType BlockPtrTy;
{
FunctionProtoType::ExtProtoInfo ExtInfo = Proto->getExtProtoInfo();
ExtInfo.TypeQuals = 0;
QualType FunctionTy = S.Context.getFunctionType(
Proto->getResultType(), Proto->getArgTypes(), ExtInfo);
BlockPtrTy = S.Context.getBlockPointerType(FunctionTy);
}
FunctionProtoType::ExtProtoInfo ExtInfo(S.Context.getDefaultCallingConvention(
/*IsVariadic=*/false, /*IsCXXMethod=*/true));
ExtInfo.TypeQuals = Qualifiers::Const;
QualType ConvTy = S.Context.getFunctionType(BlockPtrTy, None, ExtInfo);
SourceLocation Loc = IntroducerRange.getBegin();
DeclarationName Name
= S.Context.DeclarationNames.getCXXConversionFunctionName(
S.Context.getCanonicalType(BlockPtrTy));
DeclarationNameLoc NameLoc;
NameLoc.NamedType.TInfo = S.Context.getTrivialTypeSourceInfo(BlockPtrTy, Loc);
CXXConversionDecl *Conversion
= CXXConversionDecl::Create(S.Context, Class, Loc,
DeclarationNameInfo(Name, Loc, NameLoc),
ConvTy,
S.Context.getTrivialTypeSourceInfo(ConvTy, Loc),
/*isInline=*/true, /*isExplicit=*/false,
/*isConstexpr=*/false,
CallOperator->getBody()->getLocEnd());
Conversion->setAccess(AS_public);
Conversion->setImplicit(true);
Class->addDecl(Conversion);
}
ExprResult Sema::ActOnLambdaExpr(SourceLocation StartLoc, Stmt *Body,
Scope *CurScope,
bool IsInstantiation) {
// Collect information from the lambda scope.
SmallVector<LambdaExpr::Capture, 4> Captures;
SmallVector<Expr *, 4> CaptureInits;
LambdaCaptureDefault CaptureDefault;
SourceLocation CaptureDefaultLoc;
CXXRecordDecl *Class;
CXXMethodDecl *CallOperator;
SourceRange IntroducerRange;
bool ExplicitParams;
bool ExplicitResultType;
bool LambdaExprNeedsCleanups;
bool ContainsUnexpandedParameterPack;
SmallVector<VarDecl *, 4> ArrayIndexVars;
SmallVector<unsigned, 4> ArrayIndexStarts;
{
LambdaScopeInfo *LSI = getCurLambda();
CallOperator = LSI->CallOperator;
Class = LSI->Lambda;
IntroducerRange = LSI->IntroducerRange;
ExplicitParams = LSI->ExplicitParams;
ExplicitResultType = !LSI->HasImplicitReturnType;
LambdaExprNeedsCleanups = LSI->ExprNeedsCleanups;
ContainsUnexpandedParameterPack = LSI->ContainsUnexpandedParameterPack;
ArrayIndexVars.swap(LSI->ArrayIndexVars);
ArrayIndexStarts.swap(LSI->ArrayIndexStarts);
// Translate captures.
for (unsigned I = 0, N = LSI->Captures.size(); I != N; ++I) {
LambdaScopeInfo::Capture From = LSI->Captures[I];
assert(!From.isBlockCapture() && "Cannot capture __block variables");
bool IsImplicit = I >= LSI->NumExplicitCaptures;
// Handle 'this' capture.
if (From.isThisCapture()) {
Captures.push_back(LambdaExpr::Capture(From.getLocation(),
IsImplicit,
LCK_This));
CaptureInits.push_back(new (Context) CXXThisExpr(From.getLocation(),
getCurrentThisType(),
/*isImplicit=*/true));
continue;
}
VarDecl *Var = From.getVariable();
LambdaCaptureKind Kind = From.isCopyCapture()? LCK_ByCopy : LCK_ByRef;
Captures.push_back(LambdaExpr::Capture(From.getLocation(), IsImplicit,
Kind, Var, From.getEllipsisLoc()));
CaptureInits.push_back(From.getInitExpr());
}
switch (LSI->ImpCaptureStyle) {
case CapturingScopeInfo::ImpCap_None:
CaptureDefault = LCD_None;
break;
case CapturingScopeInfo::ImpCap_LambdaByval:
CaptureDefault = LCD_ByCopy;
break;
case CapturingScopeInfo::ImpCap_CapturedRegion:
case CapturingScopeInfo::ImpCap_LambdaByref:
CaptureDefault = LCD_ByRef;
break;
case CapturingScopeInfo::ImpCap_Block:
llvm_unreachable("block capture in lambda");
break;
}
CaptureDefaultLoc = LSI->CaptureDefaultLoc;
// C++11 [expr.prim.lambda]p4:
// If a lambda-expression does not include a
// trailing-return-type, it is as if the trailing-return-type
// denotes the following type:
//
// Skip for C++1y return type deduction semantics which uses
// different machinery.
// FIXME: Refactor and Merge the return type deduction machinery.
// FIXME: Assumes current resolution to core issue 975.
if (LSI->HasImplicitReturnType && !getLangOpts().CPlusPlus1y) {
deduceClosureReturnType(*LSI);
// - if there are no return statements in the
// compound-statement, or all return statements return
// either an expression of type void or no expression or
// braced-init-list, the type void;
if (LSI->ReturnType.isNull()) {
LSI->ReturnType = Context.VoidTy;
}
// Create a function type with the inferred return type.
const FunctionProtoType *Proto
= CallOperator->getType()->getAs<FunctionProtoType>();
QualType FunctionTy = Context.getFunctionType(
LSI->ReturnType, Proto->getArgTypes(), Proto->getExtProtoInfo());
CallOperator->setType(FunctionTy);
}
// C++ [expr.prim.lambda]p7:
// The lambda-expression's compound-statement yields the
// function-body (8.4) of the function call operator [...].
ActOnFinishFunctionBody(CallOperator, Body, IsInstantiation);
CallOperator->setLexicalDeclContext(Class);
Decl *TemplateOrNonTemplateCallOperatorDecl =
CallOperator->getDescribedFunctionTemplate()
? CallOperator->getDescribedFunctionTemplate()
: cast<Decl>(CallOperator);
TemplateOrNonTemplateCallOperatorDecl->setLexicalDeclContext(Class);
Class->addDecl(TemplateOrNonTemplateCallOperatorDecl);
PopExpressionEvaluationContext();
// C++11 [expr.prim.lambda]p6:
// The closure type for a lambda-expression with no lambda-capture
// has a public non-virtual non-explicit const conversion function
// to pointer to function having the same parameter and return
// types as the closure type's function call operator.
if (Captures.empty() && CaptureDefault == LCD_None)
addFunctionPointerConversion(*this, IntroducerRange, Class,
CallOperator);
// Objective-C++:
// The closure type for a lambda-expression has a public non-virtual
// non-explicit const conversion function to a block pointer having the
// same parameter and return types as the closure type's function call
// operator.
// FIXME: Fix generic lambda to block conversions.
if (getLangOpts().Blocks && getLangOpts().ObjC1 &&
!Class->isGenericLambda())
addBlockPointerConversion(*this, IntroducerRange, Class, CallOperator);
// Finalize the lambda class.
SmallVector<Decl*, 4> Fields;
for (RecordDecl::field_iterator i = Class->field_begin(),
e = Class->field_end(); i != e; ++i)
Fields.push_back(*i);
ActOnFields(0, Class->getLocation(), Class, Fields,
SourceLocation(), SourceLocation(), 0);
CheckCompletedCXXClass(Class);
}
if (LambdaExprNeedsCleanups)
ExprNeedsCleanups = true;
LambdaExpr *Lambda = LambdaExpr::Create(Context, Class, IntroducerRange,
CaptureDefault, CaptureDefaultLoc,
Captures,
ExplicitParams, ExplicitResultType,
CaptureInits, ArrayIndexVars,
ArrayIndexStarts, Body->getLocEnd(),
ContainsUnexpandedParameterPack);
// C++11 [expr.prim.lambda]p2:
// A lambda-expression shall not appear in an unevaluated operand
// (Clause 5).
if (!CurContext->isDependentContext()) {
switch (ExprEvalContexts.back().Context) {
case Unevaluated:
case UnevaluatedAbstract:
// We don't actually diagnose this case immediately, because we
// could be within a context where we might find out later that
// the expression is potentially evaluated (e.g., for typeid).
ExprEvalContexts.back().Lambdas.push_back(Lambda);
break;
case ConstantEvaluated:
case PotentiallyEvaluated:
case PotentiallyEvaluatedIfUsed:
break;
}
}
// TODO: Implement capturing.
if (Lambda->isGenericLambda()) {
if (!Captures.empty() || Lambda->getCaptureDefault() != LCD_None) {
Diag(Lambda->getIntroducerRange().getBegin(),
diag::err_glambda_not_fully_implemented)
<< " capturing not implemented yet";
return ExprError();
}
}
return MaybeBindToTemporary(Lambda);
}
ExprResult Sema::BuildBlockForLambdaConversion(SourceLocation CurrentLocation,
SourceLocation ConvLocation,
CXXConversionDecl *Conv,
Expr *Src) {
// Make sure that the lambda call operator is marked used.
CXXRecordDecl *Lambda = Conv->getParent();
CXXMethodDecl *CallOperator
= cast<CXXMethodDecl>(
Lambda->lookup(
Context.DeclarationNames.getCXXOperatorName(OO_Call)).front());
CallOperator->setReferenced();
CallOperator->markUsed(Context);
ExprResult Init = PerformCopyInitialization(
InitializedEntity::InitializeBlock(ConvLocation,
Src->getType(),
/*NRVO=*/false),
CurrentLocation, Src);
if (!Init.isInvalid())
Init = ActOnFinishFullExpr(Init.take());
if (Init.isInvalid())
return ExprError();
// Create the new block to be returned.
BlockDecl *Block = BlockDecl::Create(Context, CurContext, ConvLocation);
// Set the type information.
Block->setSignatureAsWritten(CallOperator->getTypeSourceInfo());
Block->setIsVariadic(CallOperator->isVariadic());
Block->setBlockMissingReturnType(false);
// Add parameters.
SmallVector<ParmVarDecl *, 4> BlockParams;
for (unsigned I = 0, N = CallOperator->getNumParams(); I != N; ++I) {
ParmVarDecl *From = CallOperator->getParamDecl(I);
BlockParams.push_back(ParmVarDecl::Create(Context, Block,
From->getLocStart(),
From->getLocation(),
From->getIdentifier(),
From->getType(),
From->getTypeSourceInfo(),
From->getStorageClass(),
/*DefaultArg=*/0));
}
Block->setParams(BlockParams);
Block->setIsConversionFromLambda(true);
// Add capture. The capture uses a fake variable, which doesn't correspond
// to any actual memory location. However, the initializer copy-initializes
// the lambda object.
TypeSourceInfo *CapVarTSI =
Context.getTrivialTypeSourceInfo(Src->getType());
VarDecl *CapVar = VarDecl::Create(Context, Block, ConvLocation,
ConvLocation, 0,
Src->getType(), CapVarTSI,
SC_None);
BlockDecl::Capture Capture(/*Variable=*/CapVar, /*ByRef=*/false,
/*Nested=*/false, /*Copy=*/Init.take());
Block->setCaptures(Context, &Capture, &Capture + 1,
/*CapturesCXXThis=*/false);
// Add a fake function body to the block. IR generation is responsible
// for filling in the actual body, which cannot be expressed as an AST.
Block->setBody(new (Context) CompoundStmt(ConvLocation));
// Create the block literal expression.
Expr *BuildBlock = new (Context) BlockExpr(Block, Conv->getConversionType());
ExprCleanupObjects.push_back(Block);
ExprNeedsCleanups = true;
return BuildBlock;
}
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