• d-bugmail puremagic.com (75/75) Mar 15 2023 https://issues.dlang.org/show_bug.cgi?id=23781

d-bugmail puremagic.com writes:

https://issues.dlang.org/show_bug.cgi?id=23781

          Issue ID: 23781
           Summary: [ICE] Segmentation Fault when taking the address of a
                    ref return at CTFE
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody puremagic.com
          Reporter: pro.mathias.lang gmail.com

```
struct Bar { int i; }
ref const(Bar) func1 (const return ref Bar b) { return b; }
immutable E1 = Bar();
enum E2 = &E1.func1();
```

```
Program received signal SIGSEGV, Segmentation fault.
0x00005555559ea2e0 in Interpreter::visit(AddrExp*) (this=0x7fffffffced0,
e=0x7ffff73366d0) at src/dmd/dinterpret.d:2039
2039                if (ve.var == istate.fd.vthis)
(gdb) bt

e=0x7ffff73366d0) at src/dmd/dinterpret.d:2039

v=0x7fffffffced0) at src/dmd/expression.d:5359

_D3dmd10dinterpret9interpretFPSQBd10expression8UnionExpCQCcQz10ExpressionPSQCvQCu10InterStateEQDoQDn8CTFEGoalZQCd
(
    goal=<incomplete type>, istate=0x0, e=0x7ffff73366d0, pue=0x7fffffffcf30)
at src/dmd/dinterpret.d:6552

_D3dmd10dinterpret9interpretFCQBc10expression10ExpressionPSQCfQCe10InterStateEQCyQCx8CTFEGoalZQCn
(
    goal=<incomplete type>, istate=0x0, e=0x7ffff73366d0) at
src/dmd/dinterpret.d:6562

_D3dmd10dinterpret13ctfeInterpretFCQBh10expression10ExpressionZQBd
(e=0x7ffff73366d0) at src/dmd/dinterpret.d:101

src/dmd/expression.d:1683

_D3dmd7initsem19initializerSemanticRCQBj4init11InitializerPSQCg6dscope5ScopeKCQCy5mtype4TypeEQDnQCe13NeedInterpretZ8visitExpMFCQEvQDm14ExpInitializerZQEk
(__capture=0x7fffffffd2a0, i=0x7ffff7b06a60) at src/dmd/initsem.d:374

_D3dmd7initsem19initializerSemanticRCQBj4init11InitializerPSQCg6dscope5ScopeKCQCy5mtype4TypeEQDnQCe13NeedInterpretZ5visit16VisitInitializerMFQEbZQEf
(__capture=0x7fffffffd2a0, init=0x7ffff7b06a60) at src/dmd/init.d-mixin-366:372

NeedInterpret) (init=0x7ffff7b06a60, sc=0x7ffff73312f0, 
    tx= 0x7ffff7b06ae0: 0x7ffff73311f0, needInterpret=<incomplete type>) at
src/dmd/initsem.d:962

(this=0x7fffffffd350, vd=0x7ffff7b06a90) at src/dmd/semantic2.d:276

(this=0x7ffff7b06a90, v=0x7fffffffd350) at src/dmd/declaration.d:1724

sc=0x7ffff73312f0) at src/dmd/semantic2.d:79

(this=0x7fffffffd410, mod=0x7ffff7b057a0) at src/dmd/semantic2.d:356

v=0x7fffffffd410) at src/dmd/dmodule.d:1261

sc=0x0) at src/dmd/semantic2.d:79

(params=..., argv=0x7fffffffdc98, argc=2) at src/dmd/mars.d:462

```

Build from master as of today (2.102), has been crashing since 2.098 (error
before). The underlying problem seems to be the way CTFE handles `CommaExp`
rewrites.

--