[cfe-dev] Problem to match a break in a for loop

[David Come via cfe-dev]

Hello,

There is missing closing ')' in your snippet (I think it is a typo).

The following works fine in clang query

breakStmt(hasAncestor(anyOf(forStmt().bind("breakForParent"),doStmt(), 
whileStmt(),cxxForRangeStmt(),switchStmt())))

On

int main(int argc, char *argv[])
{
   for(int i = 0 ;i < 10;++i){
   if(i == 5){break;}
}


it outputs

/home/david/code/d.cpp:118:3: note: "breakForParent" binds here
   for(int i = 0 ;i < 10;++i){
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/david/code/d.cpp:119:13: note: "root" binds here
  if(i == 5){break;}

David Come
On 05/07/2017 00:54, Loïc Joly via cfe-dev wrote:
> This is a repost, my initial post seems to be lost... Sorry if you 
> already received it...
>
> Hello,
>
> I’m trying to write a matcher for a break in a for loop. I’m writing 
> it that way:
>         breakStmt(
>             hasAncestor(anyOf(
>                 forStmt().bind(breakForParent), // A break can happen 
> in a for
>                 doStmt(), // or in another loop
>                 whileStmt(),
>                 cxxForRangeStmt(),
>                 switchStmt() // or in a switch
>             ))
>
>
> The goal is to match the closest ancestor that can have some meaning 
> for a break statement, and detect if it is a for loop or another 
> statement.
>
> This looks to work fine when I’m in clang-query, but when I try to 
> compile the code (with visual C++), I have the following error:
>
> 1>xxx.cpp(149): error C2784: 
> 'clang::ast_matchers::internal::ArgumentAdaptingMatcherFunc<clang::ast_matchers::internal::HasAncestorMatcher,clang::ast_matchers::internal::TypeList<clang::Decl,clang::NestedNameSpecifierLoc,clang::Stmt,clang::TypeLoc>,clang::ast_matchers::internal::TypeList<clang::Decl,clang::NestedNameSpecifierLoc,clang::Stmt,clang::TypeLoc>>::Adaptor<T> 
> clang::ast_matchers::internal::ArgumentAdaptingMatcherFunc<clang::ast_matchers::internal::HasAncestorMatcher,clang::ast_matchers::internal::TypeList<clang::Decl,clang::NestedNameSpecifierLoc,clang::Stmt,clang::TypeLoc>,clang::ast_matchers::internal::TypeList<clang::Decl,clang::NestedNameSpecifierLoc,clang::Stmt,clang::TypeLoc>>::operator 
> ()(const clang::ast_matchers::internal::Matcher<From> &) const' : 
> could not deduce template argument for 'const 
> clang::ast_matchers::internal::Matcher<From> &' from 
> 'clang::ast_matchers::internal::VariadicOperatorMatcher<clang::ast_matchers::internal::Matcher<clang::Stmt>,ResultT,ResultT,ResultT,ResultT>'
> 1>        with
> 1>        [
> 1> ResultT=clang::ast_matchers::internal::BindableMatcher<clang::Stmt>
> 1>        ]
> 1>        include\clang\astmatchers\astmatchersinternal.h(1054) : see 
> declaration of 
> 'clang::ast_matchers::internal::ArgumentAdaptingMatcherFunc<clang::ast_matchers::internal::HasAncestorMatcher,clang::ast_matchers::internal::TypeList<clang::Decl,clang::NestedNameSpecifierLoc,clang::Stmt,clang::TypeLoc>,clang::ast_matchers::internal::TypeList<clang::Decl,clang::NestedNameSpecifierLoc,clang::Stmt,clang::TypeLoc>>::operator 
> ()'
>
> Is this something I’m not supposed to do, or is it more something like 
> a bug in clang or in my compiler?
>
> Thank you,
>
> ---
> Loïc Joly
>
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev