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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I’m not an expert in clang internals but I can understand why the information it has at this point is much more limited. Consider the following example<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">--example.cc<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">template <typename T><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">struct A<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">{<br>
void foo(int);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">};<br>
<br>
template <typename T><br>
struct A<T*><br>
{<br>
struct B { void operator()(int); };<br>
B foo;<br>
};<br>
<br>
template <typename T><br>
void foo()<br>
{<br>
A<T> a;<br>
a.foo(3);<br>
}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">template void foo<int>(); // first case<br>
template void foo<int*>(); // second case<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">--end of example.cc<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">That “a.foo(3)” will either be “a.foo(3)” in the first case and “a.foo.operator()(3)” in the second case. In the first case “foo” is a member function and
in the second one is a data member.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hope this helps.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Roger<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> cfe-dev [mailto:cfe-dev-bounces@lists.llvm.org]
<b>On Behalf Of </b>Jusufadis Bakamovic via cfe-dev<br>
<b>Sent:</b> 24 January 2017 09:09<br>
<b>To:</b> cfe-dev@lists.llvm.org<br>
<b>Subject:</b> Re: [cfe-dev] libclang: Resolving dependent names<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Ping :)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 20 January 2017 at 13:49, Jusufadis Bakamovic <<a href="mailto:jbakam@gmail.com" target="_blank">jbakam@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">Hi,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">I am using libclang API to implement semantic syntax highlighting. However, there are a few rough edges which should be polished in order to get satisfying results. Resolving dependent names ('CXType_DEPENDENT'
AST nodes)</span><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"> </span><span style="font-size:9.5pt;color:black">is one of them that I've came across. libclang in this case does not provide the same depth of information about
the node(s) as it does for a non-dependent-name node(s). <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">In particular, following example depicts what I am trying to explain (please mind the comments in the code):<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">// demo.cpp<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">#include <vector><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">template <typename T><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">bool foo() {<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">std::vector<T> vec;<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"> vec._M_impl; // 'vec' is identified as part of 'CXXDependentScopeMemberExpr' but access to member field '_M_impl' is not and it's completely missing from the AST<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">return vec.empty(); // 'vec' is identified as part of 'CXXDependentScopeMemberExpr' but call expression 'empty' is not and it's completely missing from the AST<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">}<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">bool bar() {<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">std::vector<int> vec;<o:p></o:p></span></p>
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<p class="MsoNormal"><span class="m1319853679537553639gmail-m-8467628047013451978gmail-apple-tab-span"><span style="font-size:9.5pt;color:black">vec._M_impl; // both 'vec' & access to member field '_M_impl' are identified as expected</span></span><span style="font-size:9.5pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"> return vec.empty(); // both 'vec' & 'empty' are identified as expected<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">}<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">// output from clang -Xclang -ast-dump demo.cpp<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">|-FunctionTemplateDecl 0x564cf4e63c48 <demo.cpp:3:1, line:8:1> line:4:6 foo<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">| |-TemplateTypeParmDecl 0x564cf4e63af8 <line:3:11, col:20> col:20 referenced typename T<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">| `-FunctionDecl 0x564cf4e63ba0 <line:4:1, line:8:1> line:4:6 foo '_Bool (void)'<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">| `-CompoundStmt 0x564cf4e64190 <col:12, line:8:1><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">| |-DeclStmt 0x564cf4e64038 <line:5:2, col:20><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">| | `-VarDecl 0x564cf4e63fd8 <col:2, col:17> col:17 referenced vec 'std::vector<T>':'vector<T>'<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">| |-CXXDependentScopeMemberExpr 0x564cf4e64078 <line:6:2, col:6> '<dependent type>' lvalue<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">| | `-DeclRefExpr 0x564cf4e64050 <col:2> 'std::vector<T>':'vector<T>' lvalue Var 0x564cf4e63fd8 'vec' 'std::vector<T>':'vector<T>'<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">| `-ReturnStmt 0x564cf4e64178 <line:7:2, col:19><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">| `-CallExpr 0x564cf4e64150 <col:9, col:19> '<dependent type>'<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">| `-CXXDependentScopeMemberExpr 0x564cf4e640f8 <col:9, col:13> '<dependent type>' lvalue<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">| `-DeclRefExpr 0x564cf4e640d0 <col:9> 'std::vector<T>':'vector<T>' lvalue Var 0x564cf4e63fd8 'vec' 'std::vector<T>':'vector<T>'<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">`-FunctionDecl 0x564cf4e641e0 <line:10:1, line:14:1> line:10:6 bar '_Bool (void)'<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"> `-CompoundStmt 0x564cf4e76dd8 <col:12, line:14:1><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"> |-DeclStmt 0x564cf4e76898 <line:11:2, col:22><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"> | `-VarDecl 0x564cf4e646c8 <col:2, col:19> col:19 used vec 'std::vector<int>':'class std::vector<int, class std::allocator<int> >' callinit<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"> | `-CXXConstructExpr 0x564cf4e76868 <col:19> 'std::vector<int>':'class std::vector<int, class std::allocator<int> >' 'void (void)'<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"> |-MemberExpr 0x564cf4e768f8 <line:12:2, col:6> 'struct std::_Vector_base<int, class std::allocator<int> >::_Vector_impl' lvalue ._M_impl 0x564cf4e6bb78<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"> | `-ImplicitCastExpr 0x564cf4e768d8 <col:2> 'struct std::_Vector_base<int, class std::allocator<int> >' lvalue <UncheckedDerivedToBase (_Vector_base)><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"> | `-DeclRefExpr 0x564cf4e768b0 <col:2> 'std::vector<int>':'class std::vector<int, class std::allocator<int> >' lvalue Var 0x564cf4e646c8 'vec' 'std::vector<int>':'class std::vector<int, class
std::allocator<int> >'<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"> `-ReturnStmt 0x564cf4e76dc0 <line:13:2, col:19><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"> `-CXXMemberCallExpr 0x564cf4e76d50 <col:9, col:19> '_Bool'<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"> `-MemberExpr 0x564cf4e76d18 <col:9, col:13> '<bound member function type>' .empty 0x564cf4e6fc20<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"> `-ImplicitCastExpr 0x564cf4e76da8 <col:9> 'const class std::vector<int, class std::allocator<int> >' lvalue <NoOp><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"> `-DeclRefExpr 0x564cf4e76cf0 <col:9> 'std::vector<int>':'class std::vector<int, class std::allocator<int> >' lvalue Var 0x564cf4e646c8 'vec' 'std::vector<int>':'class std::vector<int,
class std::allocator<int> >'<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">Is this really a technical issue from language POV or an implementation detail that is still missing? 14.6.2 [temp.dep] defines dependent-names as constructs whose semantics may differ from one
instantiation to another. However, I am not quite sure if I understand this correctly because semantics of something being a data member or a function member cannot be really changed across different instantiations?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">I managed somehow to workaround this issue by tokenizing such (dependent) nodes and then trying to deduce their kinds by checking up their parent from the AST. I.e. 'MEMBER_REF_EXPR' dependent-name
nodes ('CXType_DEPENDENT') which have 'CALL_EXPR' as their direct AST parent can be resolved as 'CXCursor_CXXMethod'. Otherwise, they would have been resolved as 'CXCursor_FieldDecl'. This satisfies the use-case which I am currently trying to cover and it
seems to be working but I thought it would be better to have this functionality provided by the library, and probably a more generic solution which would fit other use-cases as well (i.e. non-'MEMBER_REF_EXPR' nodes). If this is possible I would be happy to
contribute.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">Cheers,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt;color:black">Adi<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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