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[CodeCompletion] Enable signature help when initializing class/struct/union members. 

Summary:
Factors out member decleration gathering and uses it in parsing to call signature
help. Doesn't support signature help for base class constructors, the code was too
coupled with diagnostic handling, but still can be factored out but just needs
more afford.

Reviewers: sammccall, ilya-biryukov, ioeric

Reviewed By: ilya-biryukov

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D51917

llvm-svn: 341949
This commit is contained in:
Kadir Cetinkaya 2018-09-11 15:02:18 +00:00
parent 98e4a5ca11
commit 84774c3ae3
5 changed files with 94 additions and 16 deletions
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12
clang/include/clang/Sema/Sema.h
View File

@ -4568,6 +4568,11 @@ private:
// of a ComparisonCategoryType enumerator.
llvm::SmallBitVector FullyCheckedComparisonCategories;
ValueDecl *tryLookupCtorInitMemberDecl(CXXRecordDecl *ClassDecl,
CXXScopeSpec &SS,
ParsedType TemplateTypeTy,
IdentifierInfo *MemberOrBase);
public:
/// Lookup the specified comparison category types in the standard
/// library, an check the VarDecls possibly returned by the operator<=>
@ -10254,6 +10259,12 @@ public:
SourceLocation Loc,
ArrayRef<Expr *> Args,
SourceLocation OpenParLoc);
QualType ProduceCtorInitMemberSignatureHelp(Scope *S, Decl *ConstructorDecl,
CXXScopeSpec SS,
ParsedType TemplateTypeTy,
ArrayRef<Expr *> ArgExprs,
IdentifierInfo *II,
SourceLocation OpenParLoc);
void CodeCompleteInitializer(Scope *S, Decl *D);
void CodeCompleteReturn(Scope *S);
void CodeCompleteAfterIf(Scope *S);
@ -10794,7 +10805,6 @@ struct LateParsedTemplate {
/// The template function declaration to be late parsed.
Decl *D;
};
} // end namespace clang
namespace llvm {

16
clang/lib/Parse/ParseDeclCXX.cpp
View File

@ -3449,6 +3449,7 @@ MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) {
if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
// FIXME: Add support for signature help inside initializer lists.
ExprResult InitList = ParseBraceInitializer();
if (InitList.isInvalid())
return true;
@ -3466,7 +3467,20 @@ MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) {
// Parse the optional expression-list.
ExprVector ArgExprs;
CommaLocsTy CommaLocs;
if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
if (Tok.isNot(tok::r_paren) &&
ParseExpressionList(ArgExprs, CommaLocs, [&] {
QualType PreferredType = Actions.ProduceCtorInitMemberSignatureHelp(
getCurScope(), ConstructorDecl, SS, TemplateTypeTy, ArgExprs, II,
T.getOpenLocation());
CalledSignatureHelp = true;
Actions.CodeCompleteExpression(getCurScope(), PreferredType);
})) {
if (PP.isCodeCompletionReached() && !CalledSignatureHelp) {
Actions.ProduceCtorInitMemberSignatureHelp(
getCurScope(), ConstructorDecl, SS, TemplateTypeTy, ArgExprs, II,
T.getOpenLocation());
CalledSignatureHelp = true;
}
SkipUntil(tok::r_paren, StopAtSemi);
return true;
}

19
clang/lib/Sema/SemaCodeComplete.cpp
View File

@ -4586,6 +4586,25 @@ QualType Sema::ProduceConstructorSignatureHelp(Scope *S, QualType Type,
return ProduceSignatureHelp(*this, S, Results, Args.size(), OpenParLoc);
}
QualType Sema::ProduceCtorInitMemberSignatureHelp(
Scope *S, Decl *ConstructorDecl, CXXScopeSpec SS, ParsedType TemplateTypeTy,
ArrayRef<Expr *> ArgExprs, IdentifierInfo *II, SourceLocation OpenParLoc) {
if (!CodeCompleter)
return QualType();
CXXConstructorDecl *Constructor =
dyn_cast<CXXConstructorDecl>(ConstructorDecl);
if (!Constructor)
return QualType();
// FIXME: Add support for Base class constructors as well.
if (ValueDecl *MemberDecl = tryLookupCtorInitMemberDecl(
Constructor->getParent(), SS, TemplateTypeTy, II))
return ProduceConstructorSignatureHelp(getCurScope(), MemberDecl->getType(),
MemberDecl->getLocation(), ArgExprs,
OpenParLoc);
return QualType();
}
void Sema::CodeCompleteInitializer(Scope *S, Decl *D) {
ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D);
if (!VD) {

39
clang/lib/Sema/SemaDeclCXX.cpp
View File

@ -3777,6 +3777,22 @@ private:
}
ValueDecl *Sema::tryLookupCtorInitMemberDecl(CXXRecordDecl *ClassDecl,
CXXScopeSpec &SS,
ParsedType TemplateTypeTy,
IdentifierInfo *MemberOrBase) {
if (SS.getScopeRep() || TemplateTypeTy)
return nullptr;
DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase);
if (Result.empty())
return nullptr;
ValueDecl *Member;
if ((Member = dyn_cast<FieldDecl>(Result.front())) ||
(Member = dyn_cast<IndirectFieldDecl>(Result.front())))
return Member;
return nullptr;
}
/// Handle a C++ member initializer.
MemInitResult
Sema::BuildMemInitializer(Decl *ConstructorD,
@ -3820,21 +3836,16 @@ Sema::BuildMemInitializer(Decl *ConstructorD,
// of a single identifier refers to the class member. A
// mem-initializer-id for the hidden base class may be specified
// using a qualified name. ]
if (!SS.getScopeRep() && !TemplateTypeTy) {
// Look for a member, first.
DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase);
if (!Result.empty()) {
ValueDecl *Member;
if ((Member = dyn_cast<FieldDecl>(Result.front())) ||
(Member = dyn_cast<IndirectFieldDecl>(Result.front()))) {
if (EllipsisLoc.isValid())
Diag(EllipsisLoc, diag::err_pack_expansion_member_init)
<< MemberOrBase
<< SourceRange(IdLoc, Init->getSourceRange().getEnd());
return BuildMemberInitializer(Member, Init, IdLoc);
}
}
// Look for a member, first.
if (ValueDecl *Member = tryLookupCtorInitMemberDecl(
ClassDecl, SS, TemplateTypeTy, MemberOrBase)) {
if (EllipsisLoc.isValid())
Diag(EllipsisLoc, diag::err_pack_expansion_member_init)
<< MemberOrBase
<< SourceRange(IdLoc, Init->getSourceRange().getEnd());
return BuildMemberInitializer(Member, Init, IdLoc);
}
// It didn't name a member, so see if it names a class.
QualType BaseType;

24
clang/test/CodeCompletion/ctor-initializer.cpp
View File

@ -64,3 +64,27 @@ struct B {
// CHECK-CC8: COMPLETION: Pattern : member2(<#args#>
int member1, member2;
};
struct Base2 {
Base2(int);
};
struct Composition1 {
Composition1() : b2_elem() {}
// RUN: %clang_cc1 -fsyntax-only -std=c++98 -code-completion-at=%s:73:28 %s -o - | FileCheck -check-prefix=CHECK-CC9 %s
// RUN: %clang_cc1 -fsyntax-only -std=c++14 -code-completion-at=%s:73:28 %s -o - | FileCheck -check-prefix=CHECK-CC9 %s
// CHECK-CC9: OVERLOAD: Base2(<#int#>)
// CHECK-CC9: OVERLOAD: Base2(<#const Base2 &#>)
// CHECK-CC9-NOT: OVERLOAD: Composition1
Composition1(Base2);
Base2 b2_elem;
};
struct Composition2 {
Composition2() : c1_elem(Base2(1)) {}
// RUN: %clang_cc1 -fsyntax-only -std=c++98 -code-completion-at=%s:84:34 %s -o - | FileCheck -check-prefix=CHECK-CC9 %s
// RUN: %clang_cc1 -fsyntax-only -std=c++14 -code-completion-at=%s:84:34 %s -o - | FileCheck -check-prefix=CHECK-CC9 %s
// RUN: %clang_cc1 -fsyntax-only -std=c++98 -code-completion-at=%s:84:35 %s -o - | FileCheck -check-prefix=CHECK-CC9 %s
// RUN: %clang_cc1 -fsyntax-only -std=c++14 -code-completion-at=%s:84:35 %s -o - | FileCheck -check-prefix=CHECK-CC9 %s
Composition1 c1_elem;
};