2215 – Forward reference enum with base type within a struct causes Segmentation Fault in the compiler

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Issue 2215 - Forward reference enum with base type within a struct causes Segmentation Fault in the compiler

Summary: Forward reference enum with base type within a struct causes Segmentation Fau...

Status:	RESOLVED FIXED
Alias:	None
Product:	D
Classification:	Unclassified
Component:	dmd (show other issues)
Version:	D2
Hardware:	x86 Linux
Importance :	P2 major
Assignee:	Walter Bright
URL:
Keywords:	ice-on-valid-code
Duplicates (1):	2290 (view as issue list)
Depends on:
Blocks:	340
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See Also:
Reported:	2008年07月10日 13:32 UTC by Steven Schveighoffer
Modified:	2015年06月09日 01:19 UTC (History)
CC List:	3 users (show)

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Description Steven Schveighoffer 2008年07月10日 13:32:22 UTC

This code causes a dmd segmentation fault:
struct S
{
 E e;
}
enum E : int
{
 E1
}
replace int with ubyte, also fails. I think this should be valid code because moving e outside the struct or putting it in a class works (no errors, no segfault).
The workaround is to declare the enum first.

Comment 1 Steven Schveighoffer 2008年08月19日 09:04:43 UTC

*** Bug 2290 has been marked as a duplicate of this bug. ***

Comment 2 Don 2009年04月02日 14:52:56 UTC

This is segfaulting in mtype.c, line 5156. If the enum is forward referenced, it doesn't know if it's default-initialised, so defaultval is null -> segfault. 
int TypeEnum::isZeroInit()
{
 return sym->defaultval->isBool(FALSE);
}
Unfortunately, 'loc' is not a parameter to isZeroInit, so I don't know how to give an error msg with missing line number.
There are actually two other places in TypeEnum where this problems happens:
isunsigned() uses memtype without checking.
hasPointers() uses toBaseType() without checking.
alignsize() probably gives error message without line number.

Comment 3 Don 2009年05月14日 07:27:38 UTC

Fixed DMD2.030.