Bug 18093 – [Reg 2.071] MSCOFF: dmd crashes when overriding a C++ method in a mixin template
Status
RESOLVED
Resolution
FIXED
Severity
regression
Priority
P1
Component
dmd
Product
D
Version
D2
Platform
All
OS
Windows
Creation time
2017-12-17T09:51:27Z
Last change time
2018-01-08T21:28:43Z
Keywords
ice, pull
Assigned to
No Owner
Creator
Rainer Schuetze
Comments
Comment #0 by r.sagitario — 2017-12-17T09:51:27Z
When building dmd itself with -m64 or -m32mscoff on windows, dmd crashes, current master with this stack trace:
DMD v2.077.1
DEBUG
object.Error@(0): Access Violation
----------------
0x00494DA6 in FuncDeclaration at c:\s\d\rainers\dmd\src\dmd\func.d(618)
0x004579F5 in DsymbolSemanticVisitor at c:\s\d\rainers\dmd\src\dmd\dsymbolsem.d(4512)
0x0045864E in DsymbolSemanticVisitor at c:\s\d\rainers\dmd\src\dmd\dsymbolsem.d(4858)
0x00497DA9 in FuncDeclaration at c:\s\d\rainers\dmd\src\dmd\func.d(2276)
...
It builds just fine with -m32. Dustmite reduces this to
//////////////////////////////////
struct ASTCodegen {}
extern (C++) class ParseTimeVisitor(AST)
{
void visit() {}
}
template ParseVisitMethods(AST)
{
override void visit() {}
}
class GenericTransitiveVisitor(AST) : ParseTimeVisitor!AST
{
mixin ParseVisitMethods!AST;
}
alias SemanticTimeTransitiveVisitor = GenericTransitiveVisitor!ASTCodegen;
//////////////////////////////////
This crashes starting with dmd 2.071, but produces a correct error message about mismatched override (as -m32 does for all versions).
Adding extern(C++) to the override method in ParseVisitMethods makes it compile in all versions and targets.