| Title | MPS does not implement a stack scanner for OS X / PowerPC |
| Status | closed |
| Priority | essential |
| Assigned user | David Jones |
| Organization | Ravenbrook |
| Description | A stack scanner (see code/ss*) is required for many clients and in particular many of the mmqa tests. |
| Analysis | The trick is scanning any roots in registers. We only need to push the saved registers onto the stack prior to scanning the stack. [MORT] documents the ABI in use on Mac OS X. Includes stack layout and register usage conventions. It is possible that the same, or very similar, code could be used for lippgc. Testing: Hmm. Finding an indicator for this problem is worryingly difficult. Now that I have a stack scanner that does nothing but returns ResOK many things seem to pass when really they ought not to. Currently, perl test/test/qa run test/function/42.c fails. as does 6.c I tested with test/function/6.c which fails before the changes and succeeds after it. REFERENCES [MORT] "Introduction to Mach-O Runtime Architecture", http://developer.apple.com/documentati...ools/Conceptual/MachORuntime/index.htmlhttp://developer.apple.com/documentati...onceptual/MachORuntime/MachORuntime.pdf |
| How found | manual_test |
| Evidence | See job001145 |
| Observed in | 1.105.0 |
| Created by | David Jones |
| Created on | 2005-03-01 10:34:56 |
| Last modified by | Gareth Rees |
| Last modified on | 2013-03-19 11:38:04 |
| History | 2005-03-01 DRJ Created. 2005-03-02 DRJ Written up and closed. |
| Change | Effect | Date | User | Description |
|---|---|---|---|---|
| 178908 | closed | 2012-08-12 23:27:35 | Richard Brooksby | Removing obsolete platforms: LII3EG Linux on i386 with EGCS LIPPGC Linux on POWER with GCC S7PPMW Mac System 7 on PowerPC with Metrowerks Codewarrior SOS8CX Solaris on SPARC 8 with cxref SOS8GC Solaris on SPARC 8 with GCC SOS8GP Solaris on SPARC 8 with GCC and gprof SOS9SC Solaris on SPARC 9 with SunPro C XCPPGC Mac OS X on PowerPC with GCC |
| 147224 | closed | 2005-03-02 09:56:51 | David Jones | MPS: Working stack scanner for xcppgc |
| 147094 | open | 2005-03-01 15:09:19 | David Jones | MPS: stack scanner for xcppgc. Does not work. |