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ImportC: can't access members in static array (#21185)

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Fixes https://github.com/dlang/dmd/issues/20472

Arrays in C implicitly convert to a pointer to their first member,
so do the implicit conversion when using them in an arrow member lookup.
This commit is contained in:
drpriver 2025-04-09 02:58:14 -07:00 • committed by GitHub
parent 7dd0506aaf
commit ca2f90d1fc
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3 changed files with 21 additions and 2 deletions
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6
compiler/src/dmd/importc.d
View file

@ -126,6 +126,12 @@ Expression fieldLookup(Expression e, Scope* sc, Identifier id, bool arrow)
e = e.expressionSemantic(sc);
if (e.isErrorExp())
return e;
if (arrow)
{
e = arrayFuncConv(e, sc);
if (e.isErrorExp())
return e;
}
auto t = e.type;
if (t.isTypePointer())

12
compiler/test/compilable/test20472.c Normal file
View file

@ -0,0 +1,12 @@
// https://github.com/dlang/dmd/issues/20472
typedef struct {
char c;
} stuff;
char test20472(void)
{
stuff s[1];
s->c = 1;
return s->c;
}
_Static_assert(test20472() == 1, "1");

5
compiler/test/compilable/testcstuff1.c
View file

@ -398,8 +398,9 @@ void* tests3()
int tests4()
{
struct S { int b; } a, *p;
a.b = 3;
struct S { int b; } a, *p, b[1];
b->b = 3;
a.b = b->b;
p = &a;
return p->b;
}