Mercurial > projects > ldc
comparison gen/llvmhelpers.cpp @ 1029:4d366a75d95f
Added hasUnalignedFields helper to check if a type has unaligned fields - as per request from fvbommel. Result is cached in TypeStruct.
| author | Tomas Lindquist Olsen <tomas.l.olsen@gmail.com> |
|---|---|
| date | Tue, 03 Mar 2009 15:08:26 +0100 |
| parents | 80490f65d4e1 |
| children | 39f12f5aa515 |
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| 1028:964af20461a9 | 1029:4d366a75d95f |
|---|---|
| 1563 if (M) | 1563 if (M) |
| 1564 return M == gIR->dmodule; | 1564 return M == gIR->dmodule; |
| 1565 return false; | 1565 return false; |
| 1566 #endif | 1566 #endif |
| 1567 } | 1567 } |
| 1568 | |
| 1569 ////////////////////////////////////////////////////////////////////////////////////////// | |
| 1570 | |
| 1571 bool hasUnalignedFields(Type* t) | |
| 1572 { | |
| 1573 t = t->toBasetype(); | |
| 1574 if (t->ty != Tstruct) | |
| 1575 return false; | |
| 1576 | |
| 1577 TypeStruct* ts = (TypeStruct*)t; | |
| 1578 if (ts->unaligned) | |
| 1579 return (ts->unaligned == 2); | |
| 1580 | |
| 1581 StructDeclaration* sym = ts->sym; | |
| 1582 | |
| 1583 // go through all the fields and try to find something unaligned | |
| 1584 ts->unaligned = 2; | |
| 1585 for (int i = 0; i < sym->fields.dim; i++) | |
| 1586 { | |
| 1587 VarDeclaration* f = (VarDeclaration*)sym->fields.data[i]; | |
| 1588 unsigned a = f->type->alignsize() - 1; | |
| 1589 if (((f->offset + a) & ~a) != f->offset) | |
| 1590 return true; | |
| 1591 else if (f->type->toBasetype()->ty == Tstruct && hasUnalignedFields(f->type)) | |
| 1592 return true; | |
| 1593 } | |
| 1594 | |
| 1595 ts->unaligned = 1; | |
| 1596 return false; | |
| 1597 } |