Bug 1172 – Inline assembler: cannot access member of templated aggregate directly

struct Foo(T) { int a; } void main() { Foo!(int) f; asm { mov EBX, f; mov EAX, Foo!(int).a[EBX]; } } The code above is essentially the same as what is under "Struct/Union/Class Member Offsets" at http://www.digitalmars.com/d/iasm.html but fails with the error "bad type/size of operands 'Foo(T)'". The workaround is to use an alias: alias Foo!(int) Foo_int; asm { mov EBX, f; mov EAX, Foo_int.a[EBX]; }

Added to DStress as http://dstress.kuehne.cn/run/a/asm_04_A.d http://dstress.kuehne.cn/run/a/asm_04_B.d http://dstress.kuehne.cn/run/a/asm_04_C.d http://dstress.kuehne.cn/run/a/asm_04_D.d

You can also use f instead of the type as a workaround: struct Foo(T) { int a; } void main() { Foo!(int)* f; asm { mov EBX, f; mov EAX, f.a.offsetof[EBX]; } } It is actually easier to type the name of the variable. It seems that the ASM parser is really simple, it doesn't support all the complex grammar that D has to offer. You can take a look at the grammar [1] and see that it only accepts simple dotIdentifiers (templates not included). I suggest we close this as WONTFIX. [1] https://dlang.org/spec/iasm.html#operands

I agree. Generally speaking in asm D expressions allowed must give either a constant or variable. member function access is already more complex.