https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95155
Bug ID: 95155
Summary: d: wrong vtable offset in virtual function call
Product: gcc
Version: 9.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: d
Assignee: ibuclaw at gdcproject dot org
Reporter: ibuclaw at gdcproject dot org
Target Milestone: ---
Seen when compiling self-hosted D compiler.
release/gcc-9 compiles:
isBaseOf (struct TypeClass * const this, struct Type * t, int * poffset)
{
if (t != 0B && t->ty == 7)
{
{
struct ClassDeclaration * cd;
cd = ((struct TypeClass *) t)->sym;
if (MEM[(bool (*<T1704>) (struct ClassDeclaration *, struct
ClassDeclaration *, int *))this->sym->__vptr + 704B] (this->sym, cd, poffset))
{
return <retval> = 1;
}
}
}
return <retval> = 0;
}
release/gcc-10 compiles:
isBaseOf (struct TypeClass * const this, struct Type * t, int * poffset)
{
if (t != 0B && t->ty == 7)
{
{
struct ClassDeclaration * cd;
cd = ((struct TypeClass *) t)->sym;
if (MEM[(bool (*<T171b>) (struct ClassDeclaration *, struct
ClassDeclaration *, int *))this->sym->__vptr + 736B] (this->sym, cd, poffset))
{
return <retval> = 1;
}
}
}
return <retval> = 0;
}
Applied all changes to gcc/d to the gcc-9 branch, and the problem gets
resolved, so will have to comb through the diff to find out what missing change
is causing gdc-9 to miscompile.
