If a method has an argument of type "const __int128 &", then calling it with an argument of type __int128 produces the error: That operation is not available on integers of more than 8 bytes. I understand that integer expressions (except direct printing) are limited to 64 bits integers at most, but converting an __int128 towards a constant __int128 reference should be allowed. Copy-pasted example: (gdb) ptype ::my_function type = void (const __int128 &) (gdb) ptype working_argument type = const __int128 & (gdb) ptype broken_argument type = __int128 (gdb) call ::my_function(working_argument) ....XX.... ...XXX...X ...XXX...X .XXX.XXXXX ..X..XX.X. ...XX.XX.. ....XXX.X. .....XX... ...XX..X.. ...XXXXXX. (gdb) call ::my_function(broken_argument) That operation is not available on integers of more than 8 bytes.
The master branch has been updated by Hannes Domani <ssbssa@sourceware.org>: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=d391f3721e20d160909a3afae7fee647ea5575a2 commit d391f3721e20d160909a3afae7fee647ea5575a2 Author: Hannes Domani <ssbssa@yahoo.de> Date: Wed Mar 20 18:23:40 2024 +0100 Fix casting in-memory values of primitive types to const reference It's currently not possible to cast an in-memory value of a primitive type to const reference: ``` (gdb) p Q.id $1 = 42 (gdb) p (int&)Q.id $2 = (int &) @0x22fd0c: 42 (gdb) p (const int&)Q.id Attempt to take address of value not located in memory. ``` And if in a function call an argument needs the same kind of casting, it also doesn't work: ``` (gdb) l f3 39 int f3(const int &i) 40 { 41 return i; 42 } (gdb) p f3(Q.id) Attempt to take address of value not located in memory. ``` It's because when the constness of the type changes in a call to value_cast, a new not_lval value is allocated, which doesn't exist in the target memory. Fixed by ignoring const/volatile/restrict qualifications in value_cast when comparing cast type to original type, so the new value will point to the same location as the original value: ``` (gdb) p (int&)i $2 = (int &) @0x39f72c: 1 (gdb) p (const int&)i $3 = (const int &) @0x39f72c: 1 (gdb) p f3(Q.id) $4 = 42 ``` Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=19423 Approved-By: Tom Tromey <tom@tromey.com>
Fixed.