• d-bugmail puremagic.com (46/46) May 08 2011 http://d.puremagic.com/issues/show_bug.cgi?id=5957
• d-bugmail puremagic.com (41/41) May 08 2011 http://d.puremagic.com/issues/show_bug.cgi?id=5957

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=5957

           Summary: Ambiguous mangling of module and template in template
                    symbol args
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: kennytm gmail.com



Consider the program:

----------------------------
module y;
import std.typecons;
template f(alias s) {
    void f() {
    }
}
void g(){}
void main() {
    f!( std.typecons )();  // A
    f!( f )();             // B
    f!( g )();             // C
}
----------------------------

The manglings are:

A:   _D1y22__T1fS133std8typeconsZ1fFZv
                 **^^^^^^^^^^^^^
B:   _D1y12__T1fS41y1fZ1fFZv
                 *^^^^
C:   _D1y17__T1fS9_D1y1gFZvZ1fFZv
                 *^^^^^^^^^

Here, the module 'std.typecons' and 'f' are simply encoded as a QualifiedName,
unlike 'g' which is encoded as a MangledName. However, with this it is very
hard for the demangler to tell the QualifiedName in A and B only have 13 and 4
characters respectively, instead of 133 and 41.

There should be some separator between the 13/4 and the 3/1, or a type should
be defined for module and templates, and encode them with MangledName instead
of QualifiedName.

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=5957




To show that this bug does affect code more than the demangler, consider the
following programs:

-----------------------------------
// a146zzzzzza.d
template b(){}
-----------------------------------
// a.d
template
zzzzzza1bTC1y130bbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffbbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffggggggggggffffffffffgggggggggg(){}
-----------------------------------
// y.d
module y;
import a146zzzzzza;
import a;
import std.stdio;
class
bbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffbbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffggggggggggffffffffffgggggggggg
{}
template f(s...) {
    void f(){ writeln(s.stringof); }
}
void main() {
    f!( a146zzzzzza.b,
bbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffbbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffggggggggggffffffffffgggggggggg
)();
    f!(
a.zzzzzza1bTC1y130bbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffbbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffggggggggggffffffffffgggggggggg
)();
}
-----------------------------------

The output is:

tuple(b(),(bbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffbbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffggggggggggffffffffffgggggggggg))
tuple(b(),(bbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffbbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffggggggggggffffffffffgggggggggg))

as we can see, the 2nd function is shadowed by the 1st as they share the same
symbol:

_D1y161__T1fS1511a146zzzzzza1bTC1y130bbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffbbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffggggggggggffffffffffggggggggggZ1fFZv

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