| This is a rough history of garbage collector bugs and versions. |
| |
| This has been maintained with varying diligence over the years. |
| |
| I made an attempt to include recent contributors here. I apologize for any |
| omissions. |
| |
| ------------------------- |
| |
| Version 1.3 and immediately preceding versions contained spurious |
| assembly language assignments to TMP_SP. Only the assignment in the PC/RT |
| code is necessary. On other machines, with certain compiler options, |
| the assignments can lead to an unsaved register being overwritten. |
| Known to cause problems under SunOS 3.5 WITHOUT the -O option. (With |
| -O the compiler recognizes it as dead code. It probably shouldn't, |
| but that's another story.) |
| |
| Version 1.4 and earlier versions used compile time determined values |
| for the stack base. This no longer works on Sun 3s, since Sun 3/80s use |
| a different stack base. We now use a straightforward heuristic on all |
| machines on which it is known to work (incl. Sun 3s) and compile-time |
| determined values for the rest. There should really be library calls |
| to determine such values. |
| |
| Version 1.5 and earlier did not ensure 8 byte alignment for objects |
| allocated on a sparc based machine. |
| |
| Version 1.8 added ULTRIX support in gc_private.h. |
| |
| Version 1.9 fixed a major bug in gc_realloc. |
| |
| Version 2.0 introduced a consistent naming convention for collector |
| routines and added support for registering dynamic library data segments |
| in the standard mark_roots.c. Most of the data structures were revamped. |
| The treatment of interior pointers was completely changed. Finalization |
| was added. Support for locking was added. Object kinds were added. |
| We added a black listing facility to avoid allocating at addresses known |
| to occur as integers somewhere in the address space. Much of this |
| was accomplished by adapting ideas and code from the PCR collector. |
| The test program was changed and expanded. |
| |
| Version 2.1 was the first stable version since 1.9, and added support |
| for PPCR. |
| |
| Version 2.2 added debugging allocation, and fixed various bugs. Among them: |
| - GC_realloc could fail to extend the size of the object for certain large object sizes. |
| - A blatant subscript range error in GC_printf, which unfortunately |
| wasn't exercised on machines with sufficient stack alignment constraints. |
| - GC_register_displacement did the wrong thing if it was called after |
| any allocation had taken place. |
| - The leak finding code would eventually break after 2048 byte |
| byte objects leaked. |
| - interface.c didn't compile. |
| - The heap size remained much too small for large stacks. |
| - The stack clearing code behaved badly for large stacks, and perhaps |
| on HP/PA machines. |
| |
| Version 2.3 added ALL_INTERIOR_POINTERS and fixed the following bugs: |
| - Missing declaration of etext in the A/UX version. |
| - Some PCR root-finding problems. |
| - Blacklisting was not 100% effective, because the plausible future |
| heap bounds were being miscalculated. |
| - GC_realloc didn't handle out-of-memory correctly. |
| - GC_base could return a nonzero value for addresses inside free blocks. |
| - test.c wasn't really thread safe, and could erroneously report failure |
| in a multithreaded environment. (The locking primitives need to be |
| replaced for other threads packages.) |
| - GC_CONS was thoroughly broken. |
| - On a SPARC with dynamic linking, signals stayed diabled while the |
| client code was running. |
| (Thanks to Manuel Serrano at INRIA for reporting the last two.) |
| |
| Version 2.4 added GC_free_space_divisor as a tuning knob, added |
| support for OS/2 and linux, and fixed the following bugs: |
| - On machines with unaligned pointers (e.g. Sun 3), every 128th word could |
| fail to be considered for marking. |
| - Dynamic_load.c erroneously added 4 bytes to the length of the data and |
| bss sections of the dynamic library. This could result in a bad memory |
| reference if the actual length was a multiple of a page. (Observed on |
| Sun 3. Can probably also happen on a Sun 4.) |
| (Thanks to Robert Brazile for pointing out that the Sun 3 version |
| was broken. Dynamic library handling is still broken on Sun 3s |
| under 4.1.1U1, but apparently not 4.1.1. If you have such a machine, |
| use -Bstatic.) |
| |
| Version 2.5 fixed the following bugs: |
| - Removed an explicit call to exit(1) |
| - Fixed calls to GC_printf and GC_err_printf, so the correct number of |
| arguments are always supplied. The OS/2 C compiler gets confused if |
| the number of actuals and the number of formals differ. (ANSI C |
| doesn't require this to work. The ANSI sanctioned way of doing things |
| causes too many compatibility problems.) |
| |
| Version 3.0 added generational/incremental collection and stubborn |
| objects. |
| |
| Version 3.1 added the following features: |
| - A workaround for a SunOS 4.X SPARC C compiler |
| misfeature that caused problems when the collector was turned into |
| a dynamic library. |
| - A fix for a bug in GC_base that could result in a memory fault. |
| - A fix for a performance bug (and several other misfeatures) pointed |
| out by Dave Detlefs and Al Dosser. |
| - Use of dirty bit information for static data under Solaris 2.X. |
| - DEC Alpha/OSF1 support (thanks to Al Dosser). |
| - Incremental collection on more platforms. |
| - A more refined heap expansion policy. Less space usage by default. |
| - Various minor enhancements to reduce space usage, and to reduce |
| the amount of memory scanned by the collector. |
| - Uncollectable allocation without per object overhead. |
| - More conscientious handling of out-of-memory conditions. |
| - Fixed a bug in debugging stubborn allocation. |
| - Fixed a bug that resulted in occasional erroneous reporting of smashed |
| objects with debugging allocation. |
| - Fixed bogus leak reports of size 4096 blocks with FIND_LEAK. |
| |
| Version 3.2 fixed a serious and not entirely repeatable bug in |
| the incremental collector. It appeared only when dirty bit info |
| on the roots was available, which is normally only under Solaris. |
| It also added GC_general_register_disappearing_link, and some |
| testing code. Interface.c disappeared. |
| |
| Version 3.3 fixes several bugs and adds new ports: |
| - PCR-specific bugs. |
| - Missing locking in GC_free, redundant FASTUNLOCK |
| in GC_malloc_stubborn, and 2 bugs in |
| GC_unregister_disappearing_link. |
| All of the above were pointed out by Neil Sharman |
| (neil@cs.mu.oz.au). |
| - Common symbols allocated by the SunOS4.X dynamic loader |
| were not included in the root set. |
| - Bug in GC_finalize (reported by Brian Beuning and Al Dosser) |
| - Merged Amiga port from Jesper Peterson (untested) |
| - Merged NeXT port from Thomas Funke (significantly |
| modified and untested) |
| |
| Version 3.4: |
| - Fixed a performance bug in GC_realloc. |
| - Updated the amiga port. |
| - Added NetBSD and 386BSD ports. |
| - Added cord library. |
| - Added trivial performance enhancement for |
| ALL_INTERIOR_POINTERS. (Don't scan last word.) |
| |
| Version 3.5 |
| - Minor collections now mark from roots only once, if that |
| doesn't cause an excessive pause. |
| - The stack clearing heuristic was refined to prevent anomalies |
| with very heavily recursive programs and sparse stacks. |
| - Fixed a bug that prevented mark stack growth in some cases. |
| GC_objects_are_marked should be set to TRUE after a call |
| to GC_push_roots and as part of GC_push_marked, since |
| both can now set mark bits. I think this is only a performance |
| bug, but I wouldn't bet on it. It's certainly very hard to argue |
| that the old version was correct. |
| - Fixed an incremental collection bug that prevented it from |
| working at all when HBLKSIZE != getpagesize() |
| - Changed dynamic_loading.c to include gc_priv.h before testing |
| DYNAMIC_LOADING. SunOS dynamic library scanning |
| must have been broken in 3.4. |
| - Object size rounding now adapts to program behavior. |
| - Added a workaround (provided by Manuel Serrano and |
| colleagues) to a long-standing SunOS 4.X (and 3.X?) ld bug |
| that I had incorrectly assumed to have been squished. |
| The collector was broken if the text segment size was within |
| 32 bytes of a multiple of 8K bytes, and if the beginning of |
| the data segment contained interesting roots. The workaround |
| assumes a demand-loadable executable. The original may have |
| have "worked" in some other cases. |
| - Added dynamic library support under IRIX5. |
| - Added support for EMX under OS/2 (thanks to Ari Huttunen). |
| |
| Version 3.6: |
| - fixed a bug in the mark stack growth code that was introduced |
| in 3.4. |
| - fixed Makefile to work around DEC AXP compiler tail recursion |
| bug. |
| |
| Version 3.7: |
| - Added a workaround for an HP/UX compiler bug. |
| - Fixed another stack clearing performance bug. Reworked |
| that code once more. |
| |
| Version 4.0: |
| - Added support for Solaris threads (which was possible |
| only by reimplementing some fraction of Solaris threads, |
| since Sun doesn't currently make the thread debugging |
| interface available). |
| - Added non-threads win32 and win32S support. |
| - (Grudgingly, with suitable muttering of obscenities) renamed |
| files so that the collector distribution could live on a FAT |
| file system. Files that are guaranteed to be useless on |
| a PC still have long names. Gc_inline.h and gc_private.h |
| still exist, but now just include gc_inl.h and gc_priv.h. |
| - Fixed a really obscure bug in finalization that could cause |
| undetected mark stack overflows. (I would be surprised if |
| any real code ever tickled this one.) |
| - Changed finalization code to dynamically resize the hash |
| tables it maintains. (This probably does not matter for well- |
| -written code. It no doubt does for C++ code that overuses |
| destructors.) |
| - Added typed allocation primitives. Rewrote the marker to |
| accommodate them with more reasonable efficiency. This |
| change should also speed up marking for GC_malloc allocated |
| objects a little. See gc_typed.h for new primitives. |
| - Improved debugging facilities slightly. Allocation time |
| stack traces are now kept by default on SPARC/SUNOS4. |
| (Thanks to Scott Schwartz.) |
| - Added better support for small heap applications. |
| - Significantly extended cord package. Fixed a bug in the |
| implementation of lazily read files. Printf and friends now |
| have cord variants. Cord traversals are a bit faster. |
| - Made ALL_INTERIOR_POINTERS recognition the default. |
| - Fixed de so that it can run in constant space, independent |
| of file size. Added simple string searching to cords and de. |
| - Added the Hull-Ellis C++ interface. |
| - Added dynamic library support for OSF/1. |
| (Thanks to Al Dosser and Tim Bingham at DEC.) |
| - Changed argument to GC_expand_hp to be expressed |
| in units of bytes instead of heap blocks. (Necessary |
| since the heap block size now varies depending on |
| configuration. The old version was never very clean.) |
| - Added GC_get_heap_size(). The previous "equivalent" |
| was broken. |
| - Restructured the Makefile a bit. |
| |
| Since version 4.0: |
| - Changed finalization implementation to guarantee that |
| finalization procedures are called outside of the allocation |
| lock, making direct use of the interface a little less dangerous. |
| MAY BREAK EXISTING CLIENTS that assume finalizers |
| are protected by a lock. Since there seem to be few multithreaded |
| clients that use finalization, this is hopefully not much of |
| a problem. |
| - Fixed a gross bug in CORD_prev. |
| - Fixed a bug in blacklst.c that could result in unbounded |
| heap growth during startup on machines that do not clear |
| memory obtained from the OS (e.g. win32S). |
| - Ported de editor to win32/win32S. (This is now the only |
| version with a mouse-sensitive UI.) |
| - Added GC_malloc_ignore_off_page to allocate large arrays |
| in the presence of ALL_INTERIOR_POINTERS. |
| - Changed GC_call_with_alloc_lock to not disable signals in |
| the single-threaded case. |
| - Reduced retry count in GC_collect_or_expand for garbage |
| collecting when out of memory. |
| - Made uncollectable allocations bypass black-listing, as they |
| should. |
| - Fixed a bug in typed_test in test.c that could cause (legitimate) |
| GC crashes. |
| - Fixed some potential synchronization problems in finalize.c |
| - Fixed a real locking problem in typd_mlc.c. |
| - Worked around an AIX 3.2 compiler feature that results in |
| out of bounds memory references. |
| - Partially worked around an IRIX5.2 beta problem (which may |
| or may not persist to the final release). |
| - Fixed a bug in the heap integrity checking code that could |
| result in explicitly deallocated objects being identified as |
| smashed. Fixed a bug in the dbg_mlc stack saving code |
| that caused old argument pointers to be considered live. |
| - Fixed a bug in CORD_ncmp (and hence CORD_str). |
| - Repaired the OS2 port, which had suffered from bit rot |
| in 4.0. Worked around what appears to be CSet/2 V1.0 |
| optimizer bug. |
| - Fixed a Makefile bug for target "c++". |
| |
| Since version 4.1: |
| - Multiple bug fixes/workarounds in the Solaris threads version. |
| (It occasionally failed to locate some register contents for |
| marking. It also turns out that thr_suspend and friends are |
| unreliable in Solaris 2.3. Dirty bit reads appear |
| to be unreliable under some weird |
| circumstances. My stack marking code |
| contained a serious performance bug. The new code is |
| extremely defensive, and has not failed in several cpu |
| hours of testing. But no guarantees ...) |
| - Added MacOS support (thanks to Patrick Beard.) |
| - Fixed several syntactic bugs in gc_c++.h and friends. (These |
| didn't bother g++, but did bother most other compilers.) |
| Fixed gc_c++.h finalization interface. (It didn't.) |
| - 64 bit alignment for allocated objects was not guaranteed in a |
| few cases in which it should have been. |
| - Added GC_malloc_atomic_ignore_off_page. |
| - Added GC_collect_a_little. |
| - Added some prototypes to gc.h. |
| - Some other minor bug fixes (notably in Makefile). |
| - Fixed OS/2 / EMX port (thanks to Ari Huttunen). |
| - Fixed AmigaDOS port. (thanks to Michel Schinz). |
| - Fixed the DATASTART definition under Solaris. There |
| was a 1 in 16K chance of the collector missing the first |
| 64K of static data (and thus crashing). |
| - Fixed some blatant anachronisms in the README file. |
| - Fixed PCR-Makefile for upcoming PPCR release. |
| |
| Since version 4.2: |
| - Fixed SPARC alignment problem with GC_DEBUG. |
| - Fixed Solaris threads /proc workaround. The real |
| problem was an interaction with mprotect. |
| - Incorporated fix from Patrick Beard for gc_c++.h (now gc_cpp.h). |
| - Slightly improved allocator space utilization by |
| fixing the GC_size_map mechanism. |
| - Integrated some Sony News and MIPS RISCos 4.51 |
| patches. (Thanks to Nobuyuki Hikichi of |
| Software Research Associates, Inc. Japan) |
| - Fixed HP_PA alignment problem. (Thanks to |
| xjam@cork.cs.berkeley.edu.) |
| - Added GC_same_obj and friends. Changed GC_base |
| to return 0 for pointers past the end of large objects. |
| Improved GC_base performance with ALL_INTERIOR_POINTERS |
| on machines with a slow integer mod operation. |
| Added GC_PTR_ADD, GC_PTR_STORE, etc. to prepare |
| for preprocessor. |
| - changed the default on most UNIX machines to be that |
| signals are not disabled during critical GC operations. |
| This is still ANSI-conforming, though somewhat dangerous |
| in the presence of signal handlers. But the performance |
| cost of the alternative is sometimes problematic. |
| Can be changed back with a minor Makefile edit. |
| - renamed IS_STRING in gc.h, to CORD_IS_STRING, thus |
| following my own naming convention. Added the function |
| CORD_to_const_char_star. |
| - Fixed a gross bug in GC_finalize. Symptom: occasional |
| address faults in that function. (Thanks to Anselm |
| Baird-Smith (Anselm.BairdSmith@inria.fr) |
| - Added port to ICL DRS6000 running DRS/NX. Restructured |
| things a bit to factor out common code, and remove obsolete |
| code. Collector should now run under SUNOS5 with either |
| mprotect or /proc dirty bits. (Thanks to Douglas Steel |
| (doug@wg.icl.co.uk)). |
| - More bug fixes and workarounds for Solaris 2.X. (These were |
| mostly related to putting the collector in a dynamic library, |
| which didn't really work before. Also SOLARIS_THREADS |
| didn't interact well with dl_open.) Thanks to btlewis@eng.sun.com. |
| - Fixed a serious performance bug on the DEC Alpha. The text |
| segment was getting registered as part of the root set. |
| (Amazingly, the result was still fast enough that the bug |
| was not conspicuous.) The fix works on OSF/1, version 1.3. |
| Hopefully it also works on other versions of OSF/1 ... |
| - Fixed a bug in GC_clear_roots. |
| - Fixed a bug in GC_generic_malloc_words_small that broke |
| gc_inl.h. (Reported by Antoine de Maricourt. I broke it |
| in trying to tweak the Mac port.) |
| - Fixed some problems with cord/de under Linux. |
| - Fixed some cord problems, notably with CORD_riter4. |
| - Added DG/UX port. |
| Thanks to Ben A. Mesander (ben@piglet.cr.usgs.gov) |
| - Added finalization registration routines with weaker ordering |
| constraints. (This is necessary for C++ finalization with |
| multiple inheritance, since the compiler often adds self-cycles.) |
| - Filled the holes in the SCO port. (Thanks to Michael Arnoldus |
| <chime@proinf.dk>.) |
| - John Ellis' additions to the C++ support: From John: |
| |
| * I completely rewrote the documentation in the interface gc_c++.h |
| (later renamed gc_cpp.h). I've tried to make it both clearer and more |
| precise. |
| |
| * The definition of accessibility now ignores pointers from an |
| finalizable object (an object with a clean-up function) to itself. |
| This allows objects with virtual base classes to be finalizable by the |
| collector. Compilers typically implement virtual base classes using |
| pointers from an object to itself, which under the old definition of |
| accessibility prevented objects with virtual base classes from ever |
| being collected or finalized. |
| |
| * gc_cleanup now includes gc as a virtual base. This was enabled by |
| the change in the definition of accessibility. |
| |
| * I added support for operator new[]. Since most (all?) compilers |
| don't yet support operator new[], it is conditionalized on |
| -DOPERATOR_NEW_ARRAY. The code is untested, but its trivial and looks |
| correct. |
| |
| * The test program test_gc_c++ (later renamed test_cpp.cc) |
| tries to test for the C++-specific functionality not tested by the |
| other programs. |
| - Added <unistd.h> include to misc.c. (Needed for ppcr.) |
| - Added PowerMac port. (Thanks to Patrick Beard again.) |
| - Fixed "srcdir"-related Makefile problems. Changed things so |
| that all externally visible include files always appear in the |
| include subdirectory of the source. Made gc.h directly |
| includable from C++ code. (These were at Per |
| Bothner's suggestion.) |
| - Changed Intel code to also mark from ebp (Kevin Warne's |
| suggestion). |
| - Renamed C++ related files so they could live in a FAT |
| file system. (Charles Fiterman's suggestion.) |
| - Changed Windows NT Makefile to include C++ support in |
| gc.lib. Added C++ test as Makefile target. |
| |
| Since version 4.3: |
| - ASM_CLEAR_CODE was erroneously defined for HP |
| PA machines, resulting in a compile error. |
| - Fixed OS/2 Makefile to create a library. (Thanks to |
| Mark Boulter (mboulter@vnet.ibm.com)). |
| - Gc_cleanup objects didn't work if they were created on |
| the stack. Fixed. |
| - One copy of Gc_cpp.h in the distribution was out of |
| synch, and failed to document some known compiler |
| problems with explicit destructor invocation. Partially |
| fixed. There are probably other compilers on which |
| gc_cleanup is miscompiled. |
| - Fixed Makefile to pass C compiler flags to C++ compiler. |
| - Added Mac fixes. |
| - Fixed os_dep.c to work around what appears to be |
| a new and different VirtualQuery bug under newer |
| versions of win32S. |
| - GC_non_gc_bytes was not correctly maintained by |
| GC_free. Fixed. Thanks to James Clark (jjc@jclark.com). |
| - Added GC_set_max_heap_size. |
| - Changed allocation code to ignore blacklisting if it is preventing |
| use of a very large block of memory. This has the advantage |
| that naive code allocating very large objects is much more |
| likely to work. The downside is you might no |
| longer find out that such code should really use |
| GC_malloc_ignore_off_page. |
| - Changed GC_printf under win32 to close and reopen the file |
| between calls. FAT file systems otherwise make the log file |
| useless for debugging. |
| - Added GC_try_to_collect and GC_get_bytes_since_gc. These |
| allow starting an abortable collection during idle times. |
| This facility does not require special OS support. (Thanks to |
| Michael Spertus of Geodesic Systems for suggesting this. It was |
| actually an easy addition. Kumar Srikantan previously added a similar |
| facility to a now ancient version of the collector. At the time |
| this was much harder, and the result was less convincing.) |
| - Added some support for the Borland development environment. (Thanks |
| to John Ellis and Michael Spertus.) |
| - Removed a misfeature from checksums.c that caused unexpected |
| heap growth. (Thanks to Scott Schwartz.) |
| - Changed finalize.c to call WARN if it encounters a finalization cycle. |
| WARN is defined in gc_priv.h to write a message, usually to stdout. |
| In many environments, this may be inappropriate. |
| - Renamed NO_PARAMS in gc.h to GC_NO_PARAMS, thus adhering to my own |
| naming convention. |
| - Added GC_set_warn_proc to intercept warnings. |
| - Fixed Amiga port. (Thanks to Michel Schinz (schinz@alphanet.ch).) |
| - Fixed a bug in mark.c that could result in an access to unmapped |
| memory from GC_mark_from_mark_stack on machines with unaligned |
| pointers. |
| - Fixed a win32 specific performance bug that could result in scanning of |
| objects allocated with the system malloc. |
| - Added REDIRECT_MALLOC. |
| |
| Since version 4.4: |
| - Fixed many minor and one major README bugs. (Thanks to Franklin Chen |
| (chen@adi.com) for pointing out many of them.) |
| - Fixed ALPHA/OSF/1 dynamic library support. (Thanks to Jonathan Bachrach |
| (jonathan@harlequin.com)). |
| - Added incremental GC support (MPROTECT_VDB) for Linux (with some |
| help from Bruno Haible). |
| - Altered SPARC recognition tests in gc.h and config.h (mostly as |
| suggested by Fergus Henderson). |
| - Added basic incremental GC support for win32, as implemented by |
| Windows NT and Windows 95. GC_enable_incremental is a noop |
| under win32s, which doesn't implement enough of the VM interface. |
| - Added -DLARGE_CONFIG. |
| - Fixed GC_..._ignore_off_page to also function without |
| -DALL_INTERIOR_POINTERS. |
| - (Hopefully) fixed RS/6000 port. (Only the test was broken.) |
| - Fixed a performance bug in the nonincremental collector running |
| on machines supporting incremental collection with MPROTECT_VDB |
| (e.g. SunOS 4, DEC AXP). This turned into a correctness bug under |
| win32s with win32 incremental collection. (Not all memory protection |
| was disabled.) |
| - Fixed some ppcr related bit rot. |
| - Caused dynamic libraries to be unregistered before reregistering. |
| The old way turned out to be a performance bug on some machines. |
| - GC_root_size was not properly maintained under MSWIN32. |
| - Added -DNO_DEBUGGING and GC_dump. |
| - Fixed a couple of bugs arising with SOLARIS_THREADS + |
| REDIRECT_MALLOC. |
| - Added NetBSD/M68K port. (Thanks to Peter Seebach |
| <seebs@taniemarie.solon.com>.) |
| - Fixed a serious realloc bug. For certain object sizes, the collector |
| wouldn't scan the expanded part of the object. (Thanks to Clay Spence |
| (cds@peanut.sarnoff.com) for noticing the problem, and helping me to |
| track it down.) |
| |
| Since version 4.5: |
| - Added Linux ELF support. (Thanks to Arrigo Triulzi <arrigo@ic.ac.uk>.) |
| - GC_base crashed if it was called before any other GC_ routines. |
| This could happen if a gc_cleanup object was allocated outside the heap |
| before any heap allocation. |
| - The heap expansion heuristic was not stable if all objects had finalization |
| enabled. Fixed finalize.c to count memory in finalization queue and |
| avoid explicit deallocation. Changed alloc.c to also consider this count. |
| (This is still not recommended. It's expensive if nothing else.) Thanks |
| to John Ellis for pointing this out. |
| - GC_malloc_uncollectable(0) was broken. Thanks to Phong Vo for pointing |
| this out. |
| - The collector didn't compile under Linux 1.3.X. (Thanks to Fred Gilham for |
| pointing this out.) The current workaround is ugly, but expected to be |
| temporary. |
| - Fixed a formatting problem for SPARC stack traces. |
| - Fixed some '=='s in os_dep.c that should have been assignments. |
| Fortunately these were in code that should never be executed anyway. |
| (Thanks to Fergus Henderson.) |
| - Fixed the heap block allocator to only drop blacklisted blocks in small |
| chunks. Made BL_LIMIT self adjusting. (Both of these were in response |
| to heap growth observed by Paul Graham.) |
| - Fixed the Metrowerks/68K Mac code to also mark from a6. (Thanks |
| to Patrick Beard.) |
| - Significantly updated README.debugging. |
| - Fixed some problems with longjmps out of signal handlers, especially under |
| Solaris. Added a workaround for the fact that siglongjmp doesn't appear to |
| do the right thing with -lthread under Solaris. |
| - Added MSDOS/djgpp port. (Thanks to Mitch Harris (maharri@uiuc.edu).) |
| - Added "make reserved_namespace" and "make user_namespace". The |
| first renames ALL "GC_xxx" identifiers as "_GC_xxx". The second is the |
| inverse transformation. Note that doing this is guaranteed to break all |
| clients written for the other names. |
| - descriptor field for kind NORMAL in GC_obj_kinds with ADD_BYTE_AT_END |
| defined should be -ALIGNMENT not WORDS_TO_BYTES(-1). This is |
| a serious bug on machines with pointer alignment of less than a word. |
| - GC_ignore_self_finalize_mark_proc didn't handle pointers to very near the |
| end of the object correctly. Caused failures of the C++ test on a DEC Alpha |
| with g++. |
| - gc_inl.h still had problems. Partially fixed. Added warnings at the |
| beginning to hopefully specify the remaining dangers. |
| - Added DATAEND definition to config.h. |
| - Fixed some of the .h file organization. Fixed "make floppy". |
| |
| Since version 4.6: |
| - Fixed some compilation problems with -DCHECKSUMS (thanks to Ian Searle) |
| - Updated some Mac specific files to synchronize with Patrick Beard. |
| - Fixed a serious bug for machines with non-word-aligned pointers. |
| (Thanks to Patrick Beard for pointing out the problem. The collector |
| should fail almost any conceivable test immediately on such machines.) |
| |
| Since version 4.7: |
| - Changed a "comment" in a MacOS specific part of mach-dep.c that caused |
| gcc to fail on other platforms. |
| |
| Since version 4.8 |
| - More README.debugging fixes. |
| - Objects ready for finalization, but not finalized in the same GC |
| cycle, could be prematurely collected. This occasionally happened |
| in test_cpp. |
| - Too little memory was obtained from the system for very large |
| objects. That could cause a heap explosion if these objects were |
| not contiguous (e.g. under PCR), and too much of them was blacklisted. |
| - Due to an improper initialization, the collector was too hesitant to |
| allocate blacklisted objects immediately after system startup. |
| - Moved GC_arrays from the data into the bss segment by not explicitly |
| initializing it to zero. This significantly |
| reduces the size of executables, and probably avoids some disk accesses |
| on program startup. It's conceivable that it might break a port that I |
| didn't test. |
| - Fixed EMX_MAKEFILE to reflect the gc_c++.h to gc_cpp.h renaming which |
| occurred a while ago. |
| |
| Since 4.9: |
| - Fixed a typo around a call to GC_collect_or_expand in alloc.c. It broke |
| handling of out of memory. (Thanks to Patrick Beard for noticing.) |
| |
| Since 4.10: |
| - Rationalized (hopefully) GC_try_to_collect in an incremental collection |
| environment. It appeared to not handle a call while a collection was in |
| progress, and was otherwise too conservative. |
| - Merged GC_reclaim_or_delete_all into GC_reclaim_all to get rid of some |
| code. |
| - Added Patrick Beard's Mac fixes, with substantial completely untested |
| modifications. |
| - Fixed the MPROTECT_VDB code to deal with large pages and imprecise |
| fault addresses (as on an UltraSPARC running Solaris 2.5). Note that this |
| was not a problem in the default configuration, which uses PROC_VDB. |
| - The DEC Alpha assembly code needed to restore $gp between calls. |
| Thanks to Fergus Henderson for tracking this down and supplying a |
| patch. |
| - The write command for "de" was completely broken for large files. |
| I used the easiest portable fix, which involved changing the semantics |
| so that f.new is written instead of overwriting f. That's safer anyway. |
| - Added README.solaris2 with a discussion of the possible problems of |
| mixing the collector's sbrk allocation with malloc/realloc. |
| - Changed the data segment starting address for SGI machines. The |
| old code failed under IRIX6. |
| - Required double word alignment for MIPS. |
| - Various minor fixes to remove warnings. |
| - Attempted to fix some Solaris threads problems reported by Zhiying Chen. |
| In particular, the collector could try to fork a thread with the |
| world stopped as part of GC_thr_init. It also failed to deal with |
| the case in which the original thread terminated before the whole |
| process did. |
| - Added -DNO_EXECUTE_PERMISSION. This has a major performance impact |
| on the incremental collector under Irix, and perhaps under other |
| operating systems. |
| - Added some code to support allocating the heap with mmap. This may |
| be preferable under some circumstances. |
| - Integrated dynamic library support for HP. |
| (Thanks to Knut Tvedten <knuttv@ifi.uio.no>.) |
| - Integrated James Clark's win32 threads support, and made a number |
| of changes to it, many of which were suggested by Pontus Rydin. |
| This is still not 100% solid. |
| - Integrated Alistair Crooks' support for UTS4 running on an Amdahl |
| 370-class machine. |
| - Fixed a serious bug in explicitly typed allocation. Objects requiring |
| large descriptors where handled in a way that usually resulted in |
| a segmentation fault in the marker. (Thanks to Jeremy Fitzhardinge |
| for helping to track this down.) |
| - Added partial support for GNU win32 development. (Thanks to Fergus |
| Henderson.) |
| - Added optional support for Java-style finalization semantics. (Thanks |
| to Patrick Bridges.) This is recommended only for Java implementations. |
| - GC_malloc_uncollectable faulted instead of returning 0 when out of |
| memory. (Thanks to dan@math.uiuc.edu for noticing.) |
| - Calls to GC_base before the collector was initialized failed on a |
| DEC Alpha. (Thanks to Matthew Flatt.) |
| - Added base pointer checking to GC_REGISTER_FINALIZER in debugging |
| mode, at the suggestion of Jeremy Fitzhardinge. |
| - GC_debug_realloc failed for uncollectable objects. (Thanks to |
| Jeremy Fitzhardinge.) |
| - Explicitly typed allocation could crash if it ran out of memory. |
| (Thanks to Jeremy Fitzhardinge.) |
| - Added minimal support for a DEC Alpha running Linux. |
| - Fixed a problem with allocation of objects whose size overflowed |
| ptrdiff_t. (This now fails unconditionally, as it should.) |
| - Added the beginning of Irix pthread support. |
| - Integrated Xiaokun Zhu's fixes for djgpp 2.01. |
| - Added SGI-style STL allocator support (gc_alloc.h). |
| - Fixed a serious bug in README.solaris2. Multithreaded programs must include |
| gc.h with SOLARIS_THREADS defined. |
| - Changed GC_free so it actually deallocates uncollectable objects. |
| (Thanks to Peter Chubb for pointing out the problem.) |
| - Added Linux ELF support for dynamic libararies. (Thanks again to |
| Patrick Bridges.) |
| - Changed the Borland cc configuration so that the assembler is not |
| required. |
| - Fixed a bug in the C++ test that caused it to fail in 64-bit |
| environments. |
| |
| Since 4.11: |
| - Fixed ElfW definition in dyn_load.c. (Thanks to Fergus Henderson.) |
| This prevented the dynamic library support from compiling on some |
| older ELF Linux systems. |
| - Fixed UTS4 port (which I apparently mangled during the integration) |
| (Thanks to again to Alistair Crooks.) |
| - "Make C++" failed on Suns with SC4.0, due to a problem with "bool". |
| Fixed in gc_priv.h. |
| - Added more pieces for GNU win32. (Thanks to Timothy N. Newsham.) |
| The current state of things should suffice for at least some |
| applications. |
| - Changed the out of memory retry count handling as suggested by |
| Kenjiro Taura. (This matters only if GC_max_retries > 0, which |
| is no longer the default.) |
| - If a /proc read failed repeatedly, GC_written_pages was not updated |
| correctly. (Thanks to Peter Chubb for diagnosing this.) |
| - Under unlikely circumstances, the allocator could infinite loop in |
| an out of memory situation. (Thanks again to Kenjiro Taura for |
| identifying the problem and supplying a fix.) |
| - Fixed a syntactic error in the DJGPP code. (Thanks to Fergus |
| Henderson for finding this by inspection.) Also fixed a test program |
| problem with DJGPP (Thanks to Peter Monks.) |
| - Atomic uncollectable objects were not treated correctly by the |
| incremental collector. This resulted in weird log statistics and |
| occasional performance problems. (Thanks to Peter Chubb for pointing |
| this out.) |
| - Fixed some problems resulting from compilers that dont define |
| __STDC__. In this case void * and char * were used inconsistently |
| in some cases. (Void * should not have been used at all. If |
| you have an ANSI superset compiler that does not define __STDC__, |
| please compile with -D__STDC__=0. Thanks to Manuel Serrano and others |
| for pointing out the problem.) |
| - Fixed a compilation problem on Irix with -n32 and -DIRIX_THREADS. |
| Also fixed some other IRIX_THREADS problems which may or may not have |
| had observable symptoms. |
| - Fixed an HP PA compilation problem in dyn_load.c. (Thanks to |
| Philippe Queinnec.) |
| - SEGV fault handlers sometimes did not get reset correctly. (Thanks |
| to David Pickens.) |
| - Added a fix for SOLARIS_THREADS on Intel. (Thanks again to David |
| Pickens.) This probably needs more work to become functional. |
| - Fixed struct sigcontext_struct in os_dep.c for compilation under |
| Linux 2.1.X. (Thanks to Fergus Henderson.) |
| - Changed the DJGPP STACKBOTTOM and DATASTART values to those suggested |
| by Kristian Kristensen. These may still not be right, but it is |
| it is likely to work more often than what was there before. They may |
| even be exactly right. |
| - Added a #include <string.h> to test_cpp.cc. This appears to help |
| with HP/UX and gcc. (Thanks to assar@sics.se.) |
| - Version 4.11 failed to run in incremental mode on recent 64-bit Irix |
| kernels. This was a problem related to page unaligned heap segments. |
| Changed the code to page align heap sections on all platforms. |
| (I had mistakenly identified this as a kernel problem earlier. |
| It was not.) |
| - Version 4.11 did not make allocated storage executable, except on |
| one or two platforms, due to a bug in a #if test. (Thanks to Dave |
| Grove for pointing this out.) |
| - Added sparc_sunos4_mach_dep.s to support Sun's compilers under SunOS4. |
| - Added GC_exclude_static_roots. |
| - Fixed the object size mapping algorithm. This shouldn't matter, |
| but the old code was ugly. |
| - Heap checking code could die if one of the allocated objects was |
| larger than its base address. (Unsigned underflow problem. Thanks |
| to Clay Spence for isolating the problem.) |
| - Added RS6000 (AIX) dynamic library support and fixed STACK_BOTTOM. |
| (Thanks to Fred Stearns.) |
| - Added Fergus Henderson's patches for improved robustness with large |
| heaps and lots of blacklisting. |
| - Added Peter Chubb's changes to support Solaris Pthreads, to support |
| MMAP allocation in Solaris, to allow Solaris to find dynamic libraries |
| through /proc, to add malloc_typed_ignore_off_page, and a few other |
| minor features and bug fixes. |
| - The Solaris 2 port should not use sbrk. I received confirmation from |
| Sun that the use of sbrk and malloc in the same program is not |
| supported. The collector now defines USE_MMAP by default on Solaris. |
| - Replaced the djgpp makefile with Gary Leavens' version. |
| - Fixed MSWIN32 detection test. |
| - Added Fergus Henderson's patches to allow putting the collector into |
| a DLL under GNU win32. |
| - Added Ivan V. Demakov's port to Watcom C on X86. |
| - Added Ian Piumarta's Linux/PowerPC port. |
| - On Brian Burton's suggestion added PointerFreeGC to the placement |
| options in gc_cpp.h. This is of course unsafe, and may be controversial. |
| On the other hand, it seems to be needed often enough that it's worth |
| adding as a standard facility. |
| |
| Since 4.12: |
| - Fixed a crucial bug in the Watcom port. There was a redundant decl |
| of GC_push_one in gc_priv.h. |
| - Added FINALIZE_ON_DEMAND. |
| - Fixed some pre-ANSI cc problems in test.c. |
| - Removed getpagesize() use for Solaris. It seems to be missing in one |
| or two versions. |
| - Fixed bool handling for SPARCCompiler version 4.2. |
| - Fixed some files in include that had gotten unlinked from the main |
| copy. |
| - Some RS/6000 fixes (missing casts). Thanks to Toralf Foerster. |
| - Fixed several problems in GC_debug_realloc, affecting mostly the |
| FIND_LEAK case. |
| - GC_exclude_static_roots contained a buggy unsigned comparison to |
| terminate a loop. (Thanks to Wilson Ho.) |
| - CORD_str failed if the substring occurred at the last possible position. |
| (Only affects cord users.) |
| - Fixed Linux code to deal with RedHat 5.0 and integrated Peter Bigot's |
| os_dep.c code for dealing with various Linux versions. |
| - Added workaround for Irix pthreads sigaction bug and possible signal |
| misdirection problems. |
| Since alpha1: |
| - Changed RS6000 STACKBOTTOM. |
| - Integrated Patrick Beard's Mac changes. |
| - Alpha1 didn't compile on Irix m.n, m < 6. |
| - Replaced Makefile.dj with a new one from Gary Leavens. |
| - Added Andrew Stitcher's changes to support SCO OpenServer. |
| - Added PRINT_BLACK_LIST, to allow debugging of high densities of false |
| pointers. |
| - Added code to debug allocator to keep track of return address |
| in GC_malloc caller, thus giving a bit more context. |
| - Changed default behavior of large block allocator to more |
| aggressively avoid fragmentation. This is likely to slow down the |
| collector when it succeeds at reducing space cost. |
| - Integrated Fergus Henderson's CYGWIN32 changes. They are untested, |
| but needed for newer versions. |
| - USE_MMAP had some serious bugs. This caused the collector to fail |
| consistently on Solaris with -DSMALL_CONFIG. |
| - Added Linux threads support, thanks largely to Fergus Henderson. |
| Since alpha2: |
| - Fixed more Linux threads problems. |
| - Changed default GC_free_space_divisor to 3 with new large block allocation. |
| (Thanks to Matthew Flatt for some measurements that suggest the old |
| value sometimes favors space too much over time.) |
| - More CYGWIN32 fixes. |
| - Integrated Tyson-Dowd's Linux-M68K port. |
| - Minor HP PA and DEC UNIX fixes from Fergus Henderson. |
| - Integrated Christoffe Raffali's Linux-SPARC changes. |
| - Allowed for one more GC fixup iteration after a full GC in incremental |
| mode. Some quick measurements suggested that this significantly |
| reduces pause times even with smaller GC_RATE values. |
| - Moved some more GC data structures into GC_arrays. This decreases |
| pause times and GC overhead, but makes debugging slightly less convenient. |
| - Fixed namespace pollution problem ("excl_table"). |
| - Made GC_incremental a constant for -DSMALL_CONFIG, hopefully shrinking |
| that slightly. |
| - Added some win32 threads fixes. |
| - Integrated Ivan Demakov and David Stes' Watcom fixes. |
| - Various other minor fixes contributed by many people. |
| - Renamed config.h to gcconfig.h, since config.h tends to be used for |
| many other things. |
| - Integrated Matthew Flatt's support for 68K MacOS "far globals". |
| - Fixed up some of the dynamic library Makefile targets for consistency |
| across platforms. |
| - Fixed a USE_MMAP typo that caused out-of-memory handling to fail |
| on Solaris. |
| - Added code to test.c to test thread creation a bit more. |
| - Integrated GC_win32_free_heap, as suggested by Ivan Demakov. |
| - Fixed Solaris 2.7 stack base finding problem. (This may actually |
| have been done in an earlier alpha release.) |
| Since alpha3: |
| - Fixed MSWIN32 recognition test, which interfered with cygwin. |
| - Removed unnecessary gc_watcom.asm from distribution. Removed |
| some obsolete README.win32 text. |
| - Added Alpha Linux incremental GC support. (Thanks to Philipp Tomsich |
| for code for retrieving the fault address in a signal handler.) |
| Changed Linux signal handler context argument to be a pointer. |
| - Took care of some new warnings generated by the 7.3 SGI compiler. |
| - Integrated Phillip Musumeci's FreeBSD/ELF fixes. |
| - -DIRIX_THREADS was broken with the -o32 ABI (typo in gc_priv.h> |
| |
| Since 4.13: |
| - Fixed GC_print_source_ptr to not use a prototype. |
| - generalized CYGWIN test. |
| - gc::new did the wrong thing with PointerFreeGC placement. |
| (Thanks to Rauli Ruohonen.) |
| - In the ALL_INTERIOR_POINTERS (default) case, some callee-save register |
| values could fail to be scanned if the register was saved and |
| reused in a GC frame. This showed up in verbose mode with gctest |
| compiled with an unreleased SGI compiler. I vaguely recall an old |
| bug report that may have been related. The bug was probably quite old. |
| (The problem was that the stack scanning could be deferred until |
| after the relevant frame was overwritten, and the new save location |
| might be outside the scanned area. Fixed by more eager stack scanning.) |
| - PRINT_BLACK_LIST had some problems. A few source addresses were garbage. |
| - Replaced Makefile.dj and added -I flags to cord make targets. |
| (Thanks to Gary Leavens.) |
| - GC_try_to_collect was broken with the nonincremental collector. |
| - gc_cleanup destructors could pass the wrong address to |
| GC_register_finalizer_ignore_self in the presence of multiple |
| inheritance. (Thanks to Darrell Schiebel.) |
| - Changed PowerPC Linux stack finding code. |
| |
| Since 4.14alpha1 |
| - -DSMALL_CONFIG did not work reliably with large (> 4K) pages. |
| Recycling the mark stack during expansion could result in a size |
| zero heap segment, which confused things. (This was probably also an |
| issue with the normal config and huge pages.) |
| - Did more work to make sure that callee-save registers were scanned |
| completely, even with the setjmp-based code. Added USE_GENERIC_PUSH_REGS |
| macro to facilitate testing on machines I have access to. |
| - Added code to explicitly push register contents for win32 threads. |
| This seems to be necessary. (Thanks to Pierre de Rop.) |
| |
| Since 4.14alpha2 |
| - changed STACKBOTTOM for DJGPP (Thanks to Salvador Eduardo Tropea). |
| |
| Since 4.14 |
| - Reworked large block allocator. Now uses multiple doubly linked free |
| lists to approximate best fit. |
| - Changed heap expansion heuristic. Entirely free blocks are no longer |
| counted towards the heap size. This seems to have a major impact on |
| heap size stability; the old version could expand the heap way too |
| much in the presence of large block fragmentation. |
| - added -DGC_ASSERTIONS and some simple assertions inside the collector. |
| This is mainlyt for collector debugging. |
| - added -DUSE_MUNMAP to allow the heap to shrink. Suupported on only |
| a few UNIX-like platforms for now. |
| - added GC_dump_regions() for debugging of fragmentation issues. |
| - Changed PowerPC pointer alignment under Linux to 4. (This needs |
| checking by someone who has one. The suggestions came to me via a |
| rather circuitous path.) |
| - Changed the Linux/Alpha port to walk the data segment backwards until |
| it encounters a SIGSEGV. The old way to find the start of the data |
| segment broke with a recent release. |
| - cordxtra.c needed to call GC_REGISTER_FINALIZER instead of |
| GC_register_finalizer, so that it would continue to work with GC_DEBUG. |
| - allochblk sometimes cleared the wrong block for debugging purposes |
| when it dropped blacklisted blocks. This could result in spurious |
| error reports with GC_DEBUG. |
| - added MACOS X Server support. (Thanks to Andrew Stone.) |
| - Changed the Solaris threads code to ignore stack limits > 8 MB with |
| a warning. Empirically, it is not safe to access arbitrary pages |
| in such large stacks. And the dirty bit implementation does not |
| guarantee that none of them will be accessed. |
| - Integrated Martin Tauchmann's Amiga changes. |
| - Integrated James Dominy's OpenBSD/SPARC port. |
| |
| Since 5.0alpha1 |
| - Fixed bugs introduced in alpha1 (OpenBSD & large block initialization). |
| - Added -DKEEP_BACK_PTRS and backptr.h interface. (The implementation |
| idea came from Al Demers.) |
| |
| Since 5.0alpha2 |
| - Added some highly incomplete code to support a copied young generation. |
| Comments on nursery.h are appreciated. |
| - Changed -DFIND_LEAK, -DJAVA_FINALIZATION, and -DFINALIZE_ON_DEMAND, |
| so the same effect could be obtained with a runtime switch. This is |
| a step towards standardizing on a single dynamic GC library. |
| - Significantly changed the way leak detection is handled, as a consequence |
| of the above. |
| |
| Since 5.0 alpha3 |
| - Added protection fault handling patch for Linux/M68K from Fergus |
| Henderson and Roman Hodek. |
| - Removed the tests for SGI_SOURCE in new_gc_alloc.h. This was causing that |
| interface to fail on nonSGI platforms. |
| - Changed the Linux stack finding code to use /proc, after changing it |
| to use HEURISTIC1. (Thanks to David Mossberger for pointing out the |
| /proc hook.) |
| - Added HP/UX incremental GC support and HP/UX 11 thread support. |
| Thread support is currently still flakey. |
| - Added basic Linux/IA64 support. |
| - Integrated Anthony Green's PicoJava support. |
| - Integrated Scott Ananian's StrongARM/NetBSD support. |
| - Fixed some fairly serious performance bugs in the incremental |
| collector. These have probably been there essentially forever. |
| (Mark bits were sometimes set before scanning dirty pages. |
| The reclaim phase unnecessarily dirtied full small object pages.) |
| - Changed the reclaim phase to ignore nearly full pages to avoid |
| touching them. |
| - Limited GC_black_list_spacing to roughly the heap growth increment. |
| - Changed full collection triggering heuristic to decrease full GC |
| frequency by default, but to explicitly trigger full GCs during |
| heap growth. This doesn't always improve things, but on average it's |
| probably a win. |
| - GC_debug_free(0, ...) failed. Thanks to Fergus Henderson for the |
| bug report and fix. |
| |
| Since 5.0 alpha4 |
| - GC_malloc_explicitly_typed and friends sometimes failed to |
| initialize first word. |
| - Added allocation routines and support in the marker for mark descriptors |
| in a type structure referenced by the first word of an object. This was |
| introduced to support gcj, but hopefully in a way that makes it |
| generically useful. |
| - Added GC_requested_heapsize, and inhibited collections in nonincremental |
| mode if the actual used heap size is less than what was explicitly |
| requested. |
| - The Solaris pthreads version of GC_pthread_create didn't handle a NULL |
| attribute pointer. Solaris thread support used the wrong default thread |
| stack size. (Thanks to Melissa O'Neill for the patch.) |
| - Changed PUSH_CONTENTS macro to no longer modify first parameter. |
| This usually doesn't matter, but it was certainly an accident waiting |
| to happen ... |
| - Added GC_register_finalizer_no_order and friends to gc.h. They're |
| needed by Java implementations. |
| - Integrated a fix for a win32 deadlock resulting from clock() calling |
| malloc. (Thanks to Chris Dodd.) |
| - Integrated Hiroshi Kawashima's port to Linux/MIPS. This was designed |
| for a handheld platform, and may or may not be sufficient for other |
| machines. |
| - Fixed a va_arg problem with the %c specifier in cordprnt.c. It appears |
| that this was always broken, but recent versions of gcc are the first to |
| report the (statically detectable) bug. |
| - Added an attempt at a more general solution to dlopen races/deadlocks. |
| GC_dlopen now temporarily disables collection. Still not ideal, but ... |
| - Added -DUSE_I686_PREFETCH, -DUSE_3DNOW_PREFETCH, and support for IA64 |
| prefetch instructions. May improve performance measurably, but I'm not |
| sure the code will run correctly on processors that don't support the |
| instruction. Won't build except with very recent gcc. |
| - Added caching for header lookups in the marker. This seems to result |
| in a barely measurable performance gain. Added support for interleaved |
| lookups of two pointers, but unconfigured that since the performance |
| gain is currently near zero, and it adds to code size. |
| - Changed Linux DATA_START definition to check both data_start and |
| __data_start, since nothing else seems to be portable. |
| - Added -DUSE_LD_WRAP to optionally take advantage of the GNU ld function |
| wrapping mechanism. Probably currently useful only on Linux. |
| - Moved some variables for the scratch allocator into GC_arrays, on |
| Martin Hirzel's suggestion. |
| - Fixed a win32 threads bug that caused the collector to not look for |
| interior pointers from one of the thread stacks without |
| ALL_INTERIOR_POINTERS. (Thanks to Jeff Sturm.) |
| - Added Mingw32 support. (Thanks again to Jeff Sturm for the patch.) |
| - Changed the alpha port to use the generic register scanning code instead |
| of alpha_mach_dep.s. Alpha_mach_dep.s doesn't look for pointers in fp |
| registers, but gcc sometimes spills pointers there. (Thanks to Manuel |
| Serrano for helping me debug this by email.) Changed the IA64 code to |
| do something similar for similar reasons. |
| |
| [5.0alpha5 doesn't really exist, but it may have escaped.] |
| |
| Since 5.0alpha6: |
| - -DREDIRECT_MALLOC was broken in alpha6. Fixed. |
| - Cleaned up gc_ccp.h slightly, thus also causing the HP C++ compiler to |
| accept it. |
| - Removed accidental reference to dbg_mlc.c, which caused dbg_mlc.o to be |
| linked into every executable. |
| - Added PREFETCH to bitmap marker. Changed it to use the header cache. |
| - GC_push_marked sometimes pushed one object too many, resulting in a |
| segmentation fault in GC_mark_from_mark_stack. This was probably an old |
| bug. It finally showed up in gctest on win32. |
| - Gc_priv.h erroneously #defined GC_incremental to be TRUE instead of FALSE |
| when SMALL_CONFIG was defined. This was no doubt a major performance bug for |
| the default win32 configuration. |
| - Removed -DSMALL_CONFIG from NT_MAKEFILE. It seemed like an anchronism now |
| that the average PC has 64MB or so. |
| - Integrated Bryce McKinley's patches for linux threads and dynamic loading |
| from the libgcj tree. Turned on dynamic loading support for Linux/PPC. |
| - Changed the stack finding code to use environ on HP/UX. (Thanks |
| to Gustavo Rodriguez-Rivera for the suggestion.) This should probably |
| be done on other platforms, too. Since I can't test those, that'll |
| wait until after 5.0. |
| |
| Since 5.0alpha7: |
| - Fixed threadlibs.c for linux threads. -DUSE_LD_WRAP was broken and |
| -ldl was omitted. Fixed Linux stack finding code to handle |
| -DUSE_LD_WRAP correctly. |
| - Added MSWIN32 exception handler around marker, so that the collector |
| can recover from root segments that are unmapped during the collection. |
| This caused occasional failures under Windows 98, and may also be |
| an issue under Windows NT/2000. |
| |
| Since 5.0 |
| - Fixed a gc.h header bug which showed up under Irix. (Thanks to |
| Dan Sullivan.) |
| - Fixed a typo in GC_double_descr in typd_mlc.c. |
| This probably could result in objects described by array descriptors not |
| getting traced correctly. (Thanks to Ben Hutchings for pointing this out.) |
| - The block nearly full tests in reclaim.c were not correct for 64 bit |
| environments. This could result in unnecessary heap growth under unlikely |
| conditions. |
| |
| Since 5.1 |
| - dyn_load.c declared GC_scratch_last_end_ptr as an extern even if it |
| was defined as a macro. This prevented the collector from building on |
| Irix. |
| - We quietly assumed that indirect mark descriptors were never 0. |
| Our own typed allocation interface violated that. This could result |
| in segmentation faults in the marker with typed allocation. |
| - Fixed a _DUSE_MUNMAP bug in the heap block allocation code. |
| (Thanks to Ben Hutchings for the patch.) |
| - Taught the collector about VC++ handling array operator new. |
| (Thanks again to Ben Hutchings for the patch.) |
| - The two copies of gc_hdrs.h had diverged. Made one a link to the other |
| again. |
| |
| Since 5.2 (A few 5.2 patches are not in 6.0alpha1) |
| - Fixed _end declaration for OSF1. |
| - There were lots of spurious leak reports in leak detection mode, caused |
| by the fact that some pages were not being swept, and hence unmarked |
| objects weren't making it onto free lists. (This bug dated back to 5.0.) |
| - Fixed a typo in the liblinuxgc.so Makefile rule. |
| - Added the GetExitCodeThread to Win32 GC_stop_world to (mostly) work |
| around a Windows 95 GetOpenFileName problem. (Thanks to Jacob Navia.) |
| |
| Since 5.3 |
| - Fixed a typo that prevented compilation with -DUSE_3DNOW_PREFETCH. |
| (Thanks to Shawn Wagner for actually testing this.) |
| - Fixed GC_is_thread_stack in solaris_threads.c. It forgot to return a value |
| in the common case. I wonder why nobody noticed? |
| - Fixed another silly syntax problem in GC_double_descr. (Thanks to |
| Fergus Henderson for finding it.) |
| - Fixed a GC_gcj_malloc bug: It tended to release the allocator lock twice. |
| |
| Since 5.4 (A few 5.3 patches are not in 6.0alpha2) |
| - Added HP/PA prefetch support. |
| - Added -DDBG_HDRS_ALL and -DSHORT_DBG_HDRS to reduce the cost and improve |
| the reliability of generating pointer backtrace information, e.g. in |
| the Bigloo environment. |
| - Added parallel marking support (-DPARALLEL_MARK). This currently |
| works only under IA32 and IA64 Linux, but it shouldn't be hard to adapt |
| to other platforms. This is intended to be a lighter-weight (less |
| new code, probably not as scalable) solution than the work by Toshio Endo |
| et al, at the University of Tokyo. A number of their ideas were |
| reused, though the code wasn't, and the underlying data structure |
| is significantly different. In particular, we keep the global mark |
| stack as a single shared data structure, but most of the work is done |
| on smaller thread-local mark stacks. |
| - Changed GC_malloc_many to be cheaper, and to require less mutual exclusion |
| with -DPARALLEL_MARK. |
| - Added full support for thread local allocation under Linux |
| (-DTHREAD_LOCAL_ALLOC). This is a thin veneer on GC_malloc_many, and |
| should be easily portable to other platforms, especially those that |
| support pthreads. |
| - CLEAR_DOUBLE was not always getting invoked when it should have been. |
| - GC_gcj_malloc and friends used different out of memory handling than |
| everything else, probably because I forgot about one when I implemented |
| the other. They now both call GC_oom_fn(), not GC_oom_action(). |
| - Integrated Jakub Jelinek's fixes for Linux/SPARC. |
| - Moved GC_objfreelist, GC_aobjfreelist, and GC_words_allocd out of |
| GC_arrays, and separately registered the first two as excluded roots. |
| This makes code compiled with gc_inl.h less dependent on the |
| collector version. (It would be nice to remove the inclusion of |
| gc_priv.h by gc_inl.h completely, but we're not there yet. The |
| locking definitions in gc_priv.h are still referenced.) |
| This change was later coniditoned on SEPARATE_GLOBALS, which |
| is not defined by default, since it involves a performance hit. |
| - Register GC_obj_kinds separately as an excluded root region. The |
| attempt to register it with GC_arrays was usually failing. (This wasn't |
| serious, but seemed to generate some confusion.) |
| - Moved backptr.h to gc_backptr.h. |
| |
| Since 6.0alpha1 |
| - Added USE_MARK_BYTES to reduce the need for compare-and-swap on platforms |
| for which that's expensive. |
| - Fixed a locking bug ib GC_gcj_malloc and some locking assertion problems. |
| - Added a missing volatile to OR_WORD and renamed the parameter to |
| GC_compare_and_swap so it's not a C++ reserved word. (Thanks to |
| Toshio Endo for pointing out both of those.) |
| - Changed Linux dynamic library registration code to look at /proc/self/maps |
| instead of the rld data structures when REDIRECT_MALLOC is defined. |
| Otherwise some of the rld data data structures may be prematurely garbage |
| collected. (Thanks to Eric Benson for helping to track this down.) |
| - Fixed USE_LD_WRAP a bit more, so it should now work without threads. |
| - Renamed XXX_THREADS macros to GC_XXX_THREADS for namespace correctness. |
| Tomporarily added some backward compatibility definitions. Renamed |
| USE_LD_WRAP to GC_USE_LD_WRAP. |
| - Many MACOSX POWERPC changes, some additions to the gctest output, and |
| a few minor generic bug fixes. (Thanks to Dietmar Planitzer.) |
| |
| Since 6.0 alpha2 |
| - Fixed the /proc/self/maps code to not seek, since that apparently is not |
| reliable across all interesting kernels. |
| - Fixed some compilation problems in the absence of PARALLEL_MARK |
| (introduced in alpha2). |
| - Fixed an algorithmic problem with PARALLEL_MARK. If work needs to |
| be given back to the main mark "stack", the BOTTOM entries of the local |
| stack should be given away, not the top ones. This has substantial |
| performance impact, especially for > 2 processors, from what I can tell. |
| - Extracted gc_lock.h from gc_priv.h. This should eventually make it a |
| bit easier to avoid including gc_priv.h in clients. |
| - Moved all include files to include/ and removed duplicate links to the |
| same file. The old scheme was a bad idea because it was too easy to get the |
| copies out of sync, and many systems don't support hard links. |
| Unfortunately, it's likely that I broke some of the non-Unix Makefiles in |
| the process, although I tried to update them appropriately. |
| - Removed the partial support for a copied nursery. It's not clear that |
| this would be a tremendous win, since we don't consistently lose to |
| generational copying collectors. And it would significantly complicate |
| many things. May be reintroduced if/when it really turns out to win. |
| - Removed references to IRIX_JDK_THREADS, since I believe there never |
| were and never will be any clients. |
| - Added some code to linux_threads.c to possibly support HPUX threads |
| using the Linux code. Unfortunately, it doesn't work yet, and is |
| currently disabled. |
| - Added support under Linux/X86 for saving the call chain, both in (debug) |
| objects for client debugging, and in GC_arrays._last_stack for GC |
| debugging. This was previously supported only under Solaris. It is |
| not enabled by default under X86, since it requires that code be compiled |
| to explicitly dave frame pointers on the call stack. (With gcc this |
| currently happens by default, but is often turned off explicitly.) |
| To turn it on, define SAVE_CALL_CHAIN. |
| |
| Since 6.0 alpha3 |
| - Moved up the detection of mostly full blocks to the initiatiation of the |
| sweep phase. This eliminates some lock conention in the PARALLEL_MARK case, |
| as multiple threads try to look at mostly full blocks concurrently. |
| - Restored the code in GC_malloc_many that grabs a prefix of the global |
| free list. This avoids the case in which every GC_malloc_many call |
| tries and fails to allocate a new heap block, and the returns a single |
| object from the global free list. |
| - Some minor fixes in new_hblk.c. (Attempted to build free lists in order |
| of increasing addresses instead of decreasing addresses for cache performance |
| reasons. But this seems to be only a very minor gain with -DEAGER_SWEEP, |
| and a loss in other cases. So the change was backed out.) |
| - Fixed some of the documentation. (Thanks in large part to Fergus |
| Henderson.) |
| - Fixed the Linux USE_PROC_FOR_LIBRARIES code to deal with apps that perform |
| large numbers of mmaps. (Thanks to Eric Benson.) Also fixed that code to |
| deal with short reads. |
| - Added GC_get_total_bytes(). |
| - Fixed leak detection mode to avoid spurious messages under linuxthreads. |
| (This should also now be easy for the other supported threads packages. |
| But the code is tricky enough that I'm hesitant to do it without being able |
| to test. Everything allocated in the GC thread support itself should be |
| explicitly deallocated.) |
| - Made it possible (with luck) to redirect malloc to GC_local_malloc. |
| |
| Since 6.0 alpha4 |
| - Changed the definition of GC_pause in linux_threads.c to use a volatile |
| asm. Some versions of gcc apparently optimize away writes to local volatile |
| variables. This caused poor locking behaviour starting at about |
| 4 processors. |
| - Added GC_start_blocking(), GC_end_blocking() calls and wrapper for sleep |
| to linux_threads.c. |
| The first two calls could be used to generally avoid sending GC signals to |
| blocked threads, avoiding both premature wakeups and unnecessary overhead. |
| - Fixed a serious bug in thread-local allocation. At thread termination, |
| GC_free could get called on small integers. Changed the code for thread |
| termination to more efficiently return left-over free-lists. |
| - Integrated Kjetil Matheussen's BeOS support. |
| - Rearranged the directory structure to create the doc and tests |
| subdirectories. |
| - Sort of integrated Eric Benson's patch for OSF1. This provided basic |
| OSF1 thread support by suitably extending hpux_irix_threads.c. Based |
| on earlier email conversations with David Butenhof, I suspect that it |
| will be more reliable in the long run to base this on linux_threads.c |
| instead. Thus I attempted to patch up linux_threads.c based on Eric's code. |
| The result is almost certainly broken, but hopefully close enough that |
| someone with access to a machine can pick it up. |
| - Integrated lots of minor changes from the NetBSD distribution. (These |
| were supplied by David Brownlee. I'm not sure about the original |
| authors.) |
| - Hacked a bit more on the HP/UX thread-support in linux_threads.c. It |
| now appears to work in the absence of incremental collection. Renamed |
| hpux_irix_threads.c back to irix_threads.c, and removed the attempt to |
| support HPUX there. |
| - Changed gc.h to define _REENTRANT in cases in which it should already |
| have been defined. It is still safer to also define it on the command |
| line. |
| |
| Since 6.0alpha5: |
| - Changed the definition of DATASTART on ALPHA and IA64, where data_start |
| and __data_start are not defined by earlier versions of glibc. This might |
| need to be fixed on other platforms as well. |
| - Changed the way the stack base and backing store base are found on IA64. |
| This should now remain reliable on future kernels. But since it relies |
| on /proc, it will no longer work in the simulated NUE environment. |
| - Made the call to random() in dbg_mlc.c with -DKEEP_BACK_PTRS dependent |
| on the OS. On non-Unix systems, rand() should be used instead. Handled |
| small RAND_MAX. (Thanks to Peter Ross for pointing this out.) |
| - Fixed the cord make rules to create the cord subdirectory, if necessary. |
| (Thanks to Doug Moen.) |
| - Changed fo_object_size calculation in finalize.c. Turned finalization |
| of nonheap object into a no-op. Removed anachronism from GC_size() |
| implementation. |
| - Changed GC_push_dirty call in solaris_threads.c to GC_push_selected. |
| It was missed in a previous renaming. (Thanks to Vladimir Tsichevski |
| for pointing this out.) |
| - Arranged to not not mask SIGABRT in linux_threads.c. (Thanks to Bryce |
| McKinlay.) |
| - Added GC_no_dls hook for applications that want to register their own |
| roots. |
| - Integrated Kjetil Matheussen's Amiga changes. |
| - Added FREEBSD_STACKBOTTOM. Changed the X86/FreeBSD port to use it. |
| (Thanks to Matthew Flatt.) |
| - Added pthread_detach interception for platforms supported by linux_threads.c |
| and irix_threads.c. Should also be added for Solaris? |
| - Changed the USE_MMAP code to check for the case in which we got the |
| high end of the address space, i.e. mem_ptr + mem_sz == 0. It appears |
| that this can happen under Solaris 7. It seems to be allowed by what |
| I would claim is an oversight in the mmap specification. (Thanks to Toshio |
| Endo for pointing out the problem.) |
| - Cleanup of linux_threads.c. Some code was originally cloned from |
| irix_threads.c and now unnecessary. Some comments were obviously wrong. |
| - (Mostly) fixed a longstanding problem with setting of dirty bits from |
| a signal handler. In the presence of threads, dirty bits could get lost, |
| since the etting of a bit in the bit vector was not atomic with respect |
| to other updates. The fix is 100% correct only for platforms for which |
| GC_test_and_set is defined. The goal is to make that all platforms with |
| thread support. Matters only if incremental GC and threads are both |
| enabled. |
| - made GC_all_interior_pointers (a.k.a. ALL_INTERIOR_POINTERS) an |
| initialization time, instead of build-time option. This is a |
| nontrivial, high risk change. It should slow down the code measurably |
| only if MERGE_SIZES is not defined, which is a very nonstandard |
| configuration. |
| - Added doc/README.environment, and implemented what it describes. This |
| allows a number of additional configuration options to be set through |
| the environment. It documents a few previously undocumented options. |
| - Integrated Eric Benson's leak testing improvements. |
| - Removed the option to throw away the beginning of each page (DISCARD_WORDS). |
| This became less and less useful as processors enforce stricter alignment. |
| And it hadn't been tested in ages, and was thus probably broken anyway. |
| |
| Since 6.0alpha6: |
| - Added GC_finalizer_notifier. Fixed GC_finalize_on_demand. (The variable |
| actually wasn't being tested at the right points. The build-time flag |
| was.) |
| - Added Tom Tromey's S390 Linux patch. |
| - Added code to push GC_finalize_now in GC_push_finalizer_structures. |
| (Thanks to Matthew Flatt.) |
| - Added GC_push_gc_structures() to push all GC internal roots. |
| - Integrated some FreeBSD changes from Matthew Flatt. |
| - It looks like USRSTACK is not always correctly defined under Solaris. |
| Hacked gcconfig.h to attempt to work around the problem. The result |
| is not well tested. (Thanks again to Matthew Flatt for pointing this |
| out. The gross hack is mine. - HB) |
| - Added Ji-Yong Chung's win32 threads and C++ fixes. |
| - Arranged for hpux_test_and_clear.s to no longer be needed or built. |
| It was causing build problems with gas, and it's not clear this is |
| better than the pthreads alternative on this platform. |
| - Some MINGW32 fixes from Hubert Garavel. |
| - Added Initial Hitachi SH4 port from Kaz Kojima. |
| - Ported thread-local allocation and parallel mark code to HP/UX on PA_RISC. |
| - Made include/gc_mark.h more public and separated out the really private |
| pieces. This is probably still not quite sufficient for clients that |
| want to supply their own kind of type information. But it's a start. |
| This involved lots of identifier renaming to make it namespace clean. |
| - Added GC_dont_precollect for clients that need complete control over |
| the root set. |
| - GC_is_visible didn't do the right thing with gcj objects. (Not that |
| many people are likely to care, but ...) |
| - Don't redefine read with GC_USE_LD_WRAP. |
| - Initial port to LINUX/HP_PA. Incremental collection and threads are not |
| yet supported. (Incremental collection should work if you have the |
| right kernel. Threads may work with a sufficiently patched pthread |
| library.) |
| - Changed gcconfig.h to recognize __i386__ as an alternative to i386 in |
| many places. (Thanks to Benjamin Lerman.) |
| - Made win32_threads.c more tolerant of detaching a thread that it didn't |
| know about. (Thanks to Paul Nash.) |
| - Added Makefile.am and configure.in from gcc to the distribution, with |
| minimal changes. For the moment, those are just placeholders. In the |
| future, we're planning to switch to a GNU-style build environment for |
| Un*x-like systems, though the old Makefile will remain as a backup. |
| - Turned off STUBBORN_ALLOC by default, and added it back as a Makefile |
| option. |
| - Redistributed some functions between malloc.c and mallocx.c, so that |
| simple statically linked apps no longer pull in mallocx.o. |
| - Changed large object allocation to clear the first and last few words |
| of each block before releassing the lock. Otherwise the marker could see |
| objects with nonsensical type descriptors. |
| - Fixed a couple of subtle problems that could result in not recognizing |
| interior pointers from the stack. (I believe these were introduced |
| in 6.0alpha6.) |
| - GC_debug_free_inner called GC_free, which tried to reacquire the |
| allocator lock, and hence deadlocked. (DBG_HDRS_ALL probably never worked |
| with threads?) |
| - Fixed several problems with back traces. Accidental references to a free |
| list could cause the free list pointer to be overwritten by a back pointer. |
| There seemed to be some problems with the encoding of root and finalizer |
| references. |
| |
| Since 6.0alpha7: |
| - Changed GC_debug_malloc_replacement and GC_debug_realloc_replacement |
| so that they compile under Irix. (Thanks to Dave Love.) |
| - Updated powerpc_macosx_mach_dep.s so that it works if the collector |
| is in a dynamic library. (Thanks to Andrew Begel.) |
| - Transformed README.debugging into debugging.html, updating and |
| expanding it in the process. Added gcdescr.html and tree.html |
| from the web site to the GC distribution. |
| - Fixed several problems related to PRINT_BLACK_LIST. This involved |
| restructuring some of the marker macros. |
| - Fixed some problems with the sizing of objects with debug information. |
| Finalization was broken KEEP_BACK_PTRS or PRINT_BLACK_LIST. Reduced the |
| object size with SHORT_DEBUG_HDRS by another word. |
| - The "Needed to allocate blacklisted ..." warning had inadvertently |
| been turned off by default, due to a buggy test in allchblk.c. Turned |
| it back on. |
| - Removed the marker macros to deal with 2 pointers in interleaved fashion. |
| They were messy and the performance improvement seemed minimal. We'll |
| leave such scheduling issues to the compiler. |
| - Changed Linux/PowerPC test to also check for __powerpc__ in response |
| to a discussion on the gcc mailing list. |
| - On Matthew Flatt's suggestion removed the "static" from the jmp_buf |
| declaration in GC_generic_push_regs. This was causing problems in |
| systems that register all of their own roots. It looks far more correct |
| to me without the "static" anyway. |
| - Fixed several problems with thread local allocation of pointerfree or |
| typed objects. The collector was reclaiming thread-local free lists, since |
| it wasn't following the link fields. |
| - There was apparently a long-standing race condition related to multithreaded |
| incremental collection. A collection could be started and a thread stopped |
| between the memory unprotect system call and the setting of the |
| corresponding dirt bit. I believe this did not affect Solaris or PCR, which |
| use a different dirty-bit implementation. Fixed this by installing |
| signal handlers with sigaction instead of signal, and disabling the thread |
| suspend signal while in the write-protect handler. (It is unclear |
| whether this scenario ever actually occurred. I found it while tracking |
| down the following:) |
| - Incremental collection did not cooperate correctly with the PARALLEL_MARK |
| implementation of GC_malloc_many or the local_malloc primitves. It still |
| doesn't work well, but it shouldn't lose memory anymore. |
| - Integrated some changes from the gcc source tree that I had previously |
| missed. (Thanks to Bryce McKinley for the reminder/diff.) |
| - Added Makefile.direct as a copy of the default Makefile, which would |
| normally be overwritten if configure is run. |
| - Changed the gc.tar target in Makefile.direct to embed the version number |
| in the gc directory name. This will affect future tar file distributions. |
| - Changed the Irix dynamic library finding code to no longer try to |
| eliminate writable text segments under Irix6.x, since that is probably no |
| longer necessary, and can apparently be unsafe on occasion. (Thanks to |
| Shiro Kawai for pointing this out.) |
| - GC_cleanup with GC_DEBUG enabled passed a real object base address to |
| GC_debug_register_finalizer_ignore_self, which expected a pointer past the |
| debug header. Call GC_register_finalizer_ignore_self instead, even with |
| debugging enabled. (Thanks to Jean-Daniel Fekete for catching this.) |
| - The collector didn't build with call chain saving enabled but NARGS=0. |
| (Thanks to Maarten Thibaut.) |
| - Fixed up the GNU-style build files enough so that they work in some |
| obvious cases. |
| - Added initial port to Digital Mars compiler for win32. (Thanks to Walter |
| Bright.) |
| |
| Since 6.0alpha8: |
| - added README.macros. |
| - Made gc.mak a symbolic link to work around winzip's tendency to ignore |
| hard links. |
| - Simplified the setting of NEED_FIND_LIMIT in os_dep.c, possibly breaking |
| it on untested platforms. |
| - Integrated initial GNU HURD port. (Thanks to Chris Lingard and Igor |
| Khavkine.) |
| - A few more fixes for Digital Mars compiler (Walter Bright). |
| - Fixed gcc version recognition. Renamed OPERATOR_NEW_ARRAY to |
| GC_OPERATOR_NEW_ARRAY. Changed GC_OPERATOR_NEW_ARRAY to be the default. |
| It can be overridden with -DGC_NO_OPERATOR_NEW_ARRAY. (Thanks to |
| Cesar Eduardo Barros.) |
| - Changed the byte size to free-list mapping in thread local allocation |
| so that size 0 allocations are handled correctly. |
| - Fixed Linux/MIPS stackbottom for new toolchain. (Thanks to Ryan Murray.) |
| - Changed finalization registration to invoke GC_oom_fn when it runs out |
| of memory. |
| - Removed lvalue cast in finalize.c. This caused some debug configurations |
| not to build with some non-gcc compilers. |
| |
| Since 6.0alpha9: |
| - Two more bug fixes for KEEP_BACK_PTRS and DBG_HDRS_ALL. |
| - Fixed a stack clearing problem that resulted in SIGILL with a |
| misaligned stack pointer for multithreaded SPARC builds. |
| - Integrated another HURD patch (thanks to Igor Khavkine). |
| |
| Since 6.0: |
| - Non-debug, atomic allocations could result in bogus smashed object |
| reports with debugging on. (Thanks to Patrick Doyle for the small |
| test case.) |
| - Fixed GC_get_register_stack_base (Itanium only) to work around a glibc |
| 2.2.4 bug. |
| - Initial port to HP/UX on Itanium. Thread support and both 32 and 64 |
| bit ABIs appear to work. Parallel mark support doesn't yet, due to |
| some inline assembly code issues. Thread local allocation does appear |
| to work. |
| - ifdef'ed out glibc2.1/Itanium workaround. I suspect nobody is using |
| that combination anymore. |
| - Added a patch to make new_gc_alloc.h usable with gcc3.0. (Thanks to |
| Dimitris Vyzovitis for the patch.) |
| - Debugged 64-bit support on HP/UX PA-RISC. |
| - Turned on dynamic loading support for FreeBSD/ELF. (Thanks to Peter |
| Housel.) |
| - Unregistering of finalizers with debugging allocation was broken. |
| (Thanks to Jani Kajala for the test case.) |
| - Old finalizers were not returned correctly from GC_debug_register_finalizer. |
| - Disabled MPROTECT_VDB for Linux/M68K based on a report that it doesn't work. |
| - Cleaned up some statistics gathering code in reclaim.c (Thanks to Walter |
| Bright.) |
| - Added some support for OpenBSD/ELF/Linux. (Thanks to Suzuki Toshiya.) |
| - Added Jakub Jelinek's patch to use dl_iterate_phdr for dynamic library |
| traversal to dyn_load.c. Changed it to weakly reference dl_iterate_phdr, |
| so that the old code is stilll used with old versions of glibc. |
| - Cleaned up feature test macros for various threads packages and |
| integrated (partially functional) FreeBSD threads code from Loren Rittle. |
| It's likely that the cleanup broke something, since it touched lots of |
| code. It's also likelly that it fixed some unreported bugs in the |
| less common thread implementations, since some of the original code |
| didn't stand up to close scrutiny. Support for the next pthreads |
| implementation should be easier to add. |
| |
| Since 6.1alpha1: |
| - No longer wrap read by default in multithreaded applications. It was |
| pointed out on the libgcj list that this holds the allocation lock for |
| way too long if the read blocks. For now, reads into the heap are |
| broken with incremental collection. It's possible to turn this back on |
| if you make sure that read calls don't block (e.g. by calling select |
| first). |
| - Fix ifdef in Solaris_threads.h to refer to GC_SOLARIS_THREADS. |
| - Added check for environment variable GC_IGNORE_GCJ_INFO. |
| - Added printing of stop-the-world GC times if GC_PRINT_STATS environment |
| variable is set. |
| - The calloc definition in leak_detector.h was missing parentheses, and |
| realloc was missing a second argument to GC_REALLOC. |
| (Thanks to Elrond (elrond<at>samba-tng.org).) |
| - Added GC_PRINT_BACK_HEIGHT environment variable and associated |
| code, mostly in the new file backgraph.c. See doc/README.environment. |
| - Added -DUSE_GLOBAL_ALLOC to work around a Windows NT issue. (Thanks to |
| Jonathan Clark.) |
| - Integrated port to NEC EWS4800 (MIPS-based workstation, with somewhat |
| different address-space layout). This may help for other machines with |
| holes in the data segment. (Thanks to Hironori Sakamoto.) |
| - Changed the order in which GC_push_roots and friends push things onto |
| the mark stack. GC_push_all calls need to come first, since we can't |
| necessarily recovere if those overflow the mark stack. (Thanks to |
| Matthew Flatt for tracking down the problem.) |
| - Some minor cleanups to mostly support the Intel compiler on Linux/IA64. |
| |
| Since 6.1 alpha2: |
| - Minor cleanup on the gcconfig.h section for SPARC. |
| - Minor fix to support Intel compiler for I386/Linux. (Thanks to Sven |
| Hartrumpf.) |
| - Added SPARC V9 (64-bit) support. (Thanks to Jeff Sturm.) |
| - Restructured the way in which we determine whether or not to keep |
| call stacks for debug allocation. By default SAVE_CALL_COUNT is |
| now zero on all platforms. Added SAVE_CALL_NARGS parameters. |
| If possible, use execinfo.h to capture call stack. (This should |
| add support for a number of new platforms, though often at |
| considerable runtime expense.) |
| - Try to print symbolic information for call stacks. On Linux, we |
| do this with a combination of execinfo.h and running addr2line in |
| a separate process. This is both much more expensive and much more |
| useful. Amazingly, it seems to be fast enough for most purposes. |
| - Redefined strdup if -DREDIRECT_MALLOC is given. |
| - Changed incremental collector and MPROTECT_VDB implementation so that, |
| under favorable conditions, pointerfree objects are not protected. |
| Added GC_incremental_protection_needs() to determine ahead of time whether |
| pointerfree objects may be protected. Replaced GC_write_hint() with |
| GC_remove_protection(). |
| - Added test for GC_ENABLE_INCREMENTAL environment variable. |
| - Made GC_time_limit runtime configurable. Added GC_PAUSE_TIME_TARGET |
| environment variable. |
| - Eliminated GC_page_sz, a duplicate of GC_page_size. |
| - Caused the Solaris and Irix thread creation primitives to call |
| GC_init_inner(). |
| |
| Since 6.1alpha3: |
| - Fixed typo in sparc_mach_dep.S, preventing the 64-bit version from |
| building. Increased 64-bit heap size limit in test.c slightly, since |
| a functional SPARC collector seems to slightly exceed the old limits. |
| (Thanks again to Jeff Sturm.) |
| - Use NPRGREG in solaris_threads.c, thus printing all registers if things |
| go wrong. |
| - Added GC_MARKERS environment variable to allow use of a single marker |
| thread on an MP without confusing the lock implementation. |
| - Collect much less aggressively in incremental mode with GC_TIME_UNLIMITED. |
| This is really a purely generational mode, and we can afford to |
| postpone the collection until the heap is (nearly) full. |
| - Remove read() wrapper for MPROTECT_VDB. It was causing more harm than |
| good. It is often no longer needed if system calls avoid writing to |
| pointerfull heap objects. |
| - Fix MACOSX test in gcconfig.h. (Thanks to John Clements.) |
| - Change GC_test_and_set so that it consistently has one argument. |
| Add spaces to ::: in powerpc assembly code in gc_locks.h. |
| (Thanks to Ryan Murray.) |
| - Fixed a formatting error in dbg_mlc.c. Added prototype to GC_abort() |
| declaration. (Thanks to Michael Smith.) |
| - Removed "source" argument to GC_find_start(). Eliminate GC_FIND_START(). |
| - Added win32 recognition code in configure.in. Changed some of the |
| dllimport/export defines in gc.h. (Thanks to Adam Megacz.) |
| - GC_malloc_many didn't set hb_last_reclaimed when it called |
| GC_reclaim_generic. (I'm not sure this matters much, but ...) |
| - Allocating uncollectable objects with debug information sometimes |
| allocated objects that were one byte too small, since uncollectable |
| objects don't have the extra byte added at the end. (Thanks to |
| Wink Saville for pointing this out.) |
| - Added a bit more assertion checking to make sure that gcj objects |
| on free lists never have a nonzero second word. |
| - Replaced BCC_MAKEFILE with an up-to-date one. (Thanks to |
| Andre Leiradella.) |
| - Upgraded libtool, cinfigure.in and some related files to hopefully |
| support NetBSD/SPARC. (Thanks to Adrian Bunk.) Unfortunately, |
| libtool 1.4.2 seemed to be buggy due to missing quotes in several |
| "test" invocations. Fixed those in the ltmain.sh script. |
| - Some win32-specific patches, including the introduction of |
| GC_CreateThread. (Thanks to Adam Megacz.) |
| - Merged in gcj changes from Anthony Green to support embedded systems. |
| - Tried to consistently rename preprocessed assembly files with a capital |
| .S extension. |
| - Use alpha_mach_dep.S on ALPHA again. It doesn't really matter, but this |
| makes our distribution consistent with the gcc one, avoiding future merge |
| problems. |
| - Move GET_MEM definition into gcconfig.h. Include gcconfig.h slightly |
| later in gc_priv.h to avoid forward references to ptr_t. |
| - Add some testing of local allocation to test.c. |
| - Change definition of INVALID_QTID in specific.h. The -1 value was used |
| inconsistently, and too likely to collide with a valid stack address. |
| Some general clean-up of specific.[ch]. Added assertions. (Thanks |
| to Michael Smith for tracking down an intermittent bug to this |
| general area. I'm not sure it has been squashed yet, however.) |
| - On Pthread systems it was not safe to call GC_malloc() between fork() |
| and exec(). According to the applicable standards, it doesn't appear |
| to be safe to call malloc() or many other libc functions either, thus |
| it's not clear this is fixable. Added experimental support for |
| -DHANDLE_FORK in linux_threads.c which tries to support it. It may |
| succeed if libc does the right thing. I'm not sure whether it does. |
| (Thanks to Kenneth Schalk for pointing out this issue.) |
| - Documented thread local allocation primitives to require an |
| explicit GC_init call. GC_init_parallel is no longer declared to |
| be a constructor function, since that isn't portable and often |
| seems to lead to initialization order problems. |
| - Changed gc_cpp.cc and gc_cpp.h in one more attempt to make them |
| compatible with Visual C++ 6. (Thanks to Wink Saville for the |
| patch.) |
| - Some more patches for Linux on HP PA-RISC. |
| - Added include/gc_allocator.h. It implements (hopefully) standard |
| conforming (as opposed to SGI-style) allocators that allocate |
| collectable (gc_allocator) or GC-traceable, but not collectable |
| (traceable_allocator) objects. This borrows heavily from libstc++, |
| which borrows heavily from the SGI implementation, this part of |
| which was written by Matt Austern. Changed test_cpp.cc to very |
| minimally test this. |
| - On Linux/X86, retry mmap with a different start argument. That should |
| allow the collector to use more (closer to 3GB) of the address space. |
| (Thanks to Jeffrey Mark Siskind for tracking this down.) |
| - Force 64 bit alignment with GCJ support. (Reflects Bryce McKinley's |
| patch to the gcc tree.) |
| - Refined the choice of sa_handler vs. sa_sigaction in GC_dirty_init |
| to accomodate some glibc5 systems. (Thanks to Dan Fandrich for the |
| patch.) |
| - Compensated for the fact that current versions of glibc set |
| __libc_stack_end incorrectly on Linux/IA64 while initialization code |
| is running. This could cause the collector to miss 16 bytes of |
| the memory stack if GC_malloc or friends where called before main(). |
| - Mostly integrated Takis Psarogiannakopoulos' port to DG/UX Inix 86. |
| This will probably take another iteration to work, since his |
| patch conflicted with the libtool upgrade. |
| - Added README.arm.cross containing some information about cross- |
| compiling to an ARM processor from Margaret Fleck. |
| |
| Since 6.1alpha4: |
| - Added GC_finalizer_mem_freed, and changed some of the code that |
| decided on heap expansion to look at it. Memory explicitly |
| deallocated by finalizers essentially needs to be counted as reclaimed |
| by the GC. Otherwise there are cases in which the heap can grow |
| unboundedly. (Thanks to Mark Reichert for the test case.) |
| - Integrated Adam Megacz patches to not scan dynamic libraries if |
| we are compiling with gcc on win32. Otherwise we need structured |
| exception handling to deal with asynchronously unmapped root |
| segments, and gcc doesn't directly support that. |
| - Integrated Anthony Green's patch to support Wine. |
| - GC_OPERATOR_NEW_ARRAY was misspelled OPERATOR_NEW_ARRAY in several |
| places, including gc_cpp.cc. (Thanks to Wink Saville for pointing |
| this out.) |
| - Integrated Loren James Rittle's Alpha FreeBSD patches. In |
| response to Richard Henderson's suggestion, these also |
| changed the declarations of symbols like _end on many platforms to |
| that they wouldn't mistakenly be declared as short data symbols. |
| - Integrated changes from the Debian distribution. (Thanks to Ryan Murray |
| for pointing these out.) Fix C++ comments in POWERPC port. Add ARM32 |
| incremental GC support. Get rid of USE_GENERIC_PUSH_REGS for alpha/Linux, |
| this time for real. Use va_copy to get rid of cord printf problems |
| (finally). |
| - Close file descriptor used to count cpus. Thanks to Jeff Sturm for |
| pointing out the omission. |
| - Don't just drop gcj free lists in GC_start_reclaim, since that can |
| eventually cause the marker to see a bogus mark descriptor in the |
| dropped objects. The usual symptom was a very intermittent segmentation |
| fault in the marker. This mattered only if one of the GC_gcj_malloc |
| variants was used. (Thanks to Michael Smith, Jeff Sturm, Bryce |
| McKinley and Tom Tromey for helping to track this down.) |
| - Fixed Linux and Solaris/64 SPARC configuration. (Thanks to David Miller, |
| Jeff Sturm, Tom Tromey, and Christian Joensson.) |
| - Fixed a typo in strdup definition. (Thanks to Gerard A Allan.) |
| - Changed Makefile.direct to invoke $(CC) to assemble alpha_mach_dep.S. |
| This is needed on Linux. I'm not sure whether it's better or worse |
| on Tru64. |
| - Changed gc_cpp.h once more to declare operator new and friends only in |
| a Microsoft environment. This may need further fine tuning. (Thanks to |
| Johannes Schmidt for pointing out that the older code breaks on gcc3.0.4.) |
| - Don't ever override strdup if it's already macro defined. (Thanks to |
| Adnan Ali for pointing out the problem.) |
| - Changed gc_cpp.h yet again to also overload placement new. Due to the |
| C++ overloading rules, the other overloaded new operations otherwise hide |
| placement new, which causes many STL uses to break. (Thanks to Reza |
| Shahidi for reporting this, and to Matt Austern for proposing a fix.) |
| - Integrated cygwin pthreads support from Dan Bonachea. |
| - Turn on DYNAMIC_LOADING for NetBSD. (Thanks to Krister Walfridsson.) |
| - Changed printing code to print more complete GC times. |
| - Applied Mark Mitchell's Irix patch to correct some bitrot. |
| - Clarified which object-printing routines in dbg_mlc.c should hold |
| the allocation lock. Restructured the code to allow reasonable object |
| printing with -DREDIRECT_MALLOC. |
| - Fix the Linux mmap code to always start with 0x1000 as the initial hint. |
| Minor patches for 64-bit AIX, particularly to STACKBOTTOM. |
| (Thanks again to Jeffrey Mark Siskind.) |
| - Renamed "SUSPENDED" flag for Solaris threads support to avoid a conflict |
| with a system header. (Thanks to Philp Brown.) |
| - Cause win32_threads.c to handle an out of range stack pointer correctly, |
| though currently with a warning. (Thanks to Jonathan Clark for |
| observing that win32 applications may temporarily use the stack |
| pointer for other purposes, and suggesting a fix. Unfortunately, it's |
| not clear that there is a complete solution to this problem.) |
| |
| Since 6.1alpha5: |
| - Added GC_MAXIMUM_HEAP_SIZE environment variable. |
| - Fix configure.in for MIPS/LINUX. (Thanks to H.J. Lu.) |
| - Double page hash table size for -DLARGE_CONFIG. |
| - Integrated Bo Thorsen's X86-64 support. |
| - STACKBOTTOM definition for LINUX/MIPS was partially changed back. |
| (Thanks to H.J. Lu and Hiroshi Kawashima for resolving this.) |
| - Replaced all occurrences of LINUX_DATA_START in gcconfig.h with |
| SEARCH_FOR_DATA_START. It doesn't hurt to falll back to a search. |
| And __data_start doesn't seem to get defined correctly of the GC |
| library is loaded with LD_PRELOAD, e.g. for leak detection. |
| - If the GC_find_leak environment variable is set, do a |
| atexit(GC_gcollect) to give us at least one chance to detect leaks. |
| This may report some very benign leaks, but ... |
| - Addeded REDIRECT_FREE. It's necessary if we want leak detection with |
| LD_PRELOAD. |
| - Defer printing of leaked objects, as for smashed objects. |
| - Fixed process and descriptor leak in GC_print_callers. Try for |
| line number even if we got function name.) |
| - Ported parallel GC support and thread local allocation to Alpha. |
| Not yet well-tested. |
| - Added GC_DUMP_REGULARLY and added finalization statistics to GC_dump(). |
| - Fixed Makefile.am to mention alpha_mach_dep.S instead of the defunct |
| alpha_mach_dep.s. (Thanks to Fergus Henderson.) |
| - Incorporated a change to new_gc_alloc.h, suggested by Johannes Schmidt, |
| which should make it work with gcc3.1. (I would still like to encourage |
| use of gc_allocator.h instead.) |
| - Use alpha_mach_dep.S only on Linux. (It's not clear that this is |
| optimal, but it otherwise didn't build on Tru64. Thanks to Fergus |
| Henderson.) |
| - Added ifdef to guard free() in os_dep.c. Otherwise we get a |
| compilation error on Irix. (Thanks to Dai Sato.) |
| - Added an experimental version of GC_memalign to mallocx.c. This can't |
| always work, since we don't handle alignment requests in the hblk-level |
| allocator, and we can't handle arbitrary pointer displacements unless |
| GC_all_interior_pointers is enabled. But it should work for alignment |
| requests up to HBLKSIZE. This is not yet documented in the standard |
| places. |
| - Finally debugged the OSF1/Tru64 thread support. This needs more testing, |
| since I needed to add a somewhat unconvincing workaround for signal |
| delivery issues that I don't yet completely understand. But it does |
| pass my tests, even in parallel GC mode. Incremental GC support is |
| disabled if thread support is enabled, due to the signal issues. |
| - Eliminated name-space-incorrect definition of _cdecl from gc_cpp.h. |
| - Added GC_debug_malloc_replacement and GC_debug_realloc_replacement |
| declarations to gc.h. On IA64, this is required for REDIRECT_MALLOC |
| to work correctly with these. |
| - Fixed Linux USE_PROC_FOR_LIBRARIES to work with a 64-bit /proc format. |
| |
| Since 6.1: |
| - Guard the test for GC_DUMP_REGULARLY in misc.c with |
| "#ifndef NO_DEBUGGING". Otherwise it fails to build with NO_DEBUGGING |
| defined. (Thanks to Manuel Serrano.) |
| - Message about retrying suspend signals was incorrectly generated even when |
| flag was not set. |
| - Cleaned up MACOSX/NEXT root registration code. There was apparently a |
| separate ifdef case in GC_register_data_segments() for no reason. |
| - Removed MPROTECT_VDB for MACOSX port, based on one negative report. |
| - Arrange for gc.h and friends to be correctly installed with GNU-style |
| "make install". |
| - Enable the GNU-style build facility include C++ support in the library |
| with --enable-cplusplus. (Thanks to Thomas Maier for some of the patch.) |
| - Mark from GC_thread_key in linux_threads.c, in case that's allocated |
| from the garbage collected heap, as it is with our own thread-specific |
| storage implementation. (Thanks to Jeff Sturm.) |
| - Mark all free list header blocks if they are heap allocated. This avoids |
| some unnecessary tracing. And it remains correct if we clear the |
| root set. (Thanks to Jeff Sturm for identifying the bug.) |
| - Improved S390/Linux support. Add S390/Linux 64-bit support. (Thanks |
| to Ulrich Weigand.) |
| - Corrected the spelling of GC_{M,C}ALLOC_EXPLICTLY_TYPED to |
| GC_{M,C}ALLOC_EXPLICITLY_TYPED in gc_typed.h. This is technically |
| an interface change. Based on the fact that nobody reported this, |
| I suspect/hope there were no clients. |
| - Cleaned up gc_typed.h so that (1) it adds an extern "C" declaration |
| when appropriate, (2) doesn't generate references to undefined internal |
| macros, and (3) allows easier manual construction of descriptors. |
| - Close the file descriptor used by GC_print_address_map(). |
| - Set the "close-on-exec" bit for various file descriptors maintained |
| for the collector's internal use. |
| - Added a hack to find memory segments owned by the system allocator |
| under win32. Based on my tests, this tends to eventually find all |
| segments, though it may take a while. There appear to be cleaner, |
| but slower solutions under NT/XP. But they rely on an API that's |
| unsupported under 9X. |
| - Changed Linux PowerPC stack finding to LINUX_STACKBOTTOM. (Thanks |
| to Akira Tagoh for pointing out that HEURISTIC1 doesn't work on |
| 64-bit kernels.) |
| - Added GC_set_free_space_divisor to avoid some Windows dll issues. |
| - Added FIXUP_POINTER, POINTER_SHIFT, POINTER_MASK to allow preprocessing |
| of candidate pointers for tagging, etc. |
| - Always lock around GC_notify_full_gc(). Simplified code for |
| invoking GC_notify_full_gc(). |
| - Changed the way DATASTART is defined on FreeBSD to be robust against |
| an unmapped page after etext. (Thanks to Hironori Sakamoto for |
| tracking down the intermittent failure.) |
| - Made GC_enable() and GC_disable() official. Deprecated direct update |
| of GC_dont_gc. Changed GC_gcollect to be a noop when garbage collection |
| is disabled. |
| - Call GC_register_dynamic_libraries before stopping the world on Linux, |
| in order to avoid a potential deadlock due to the dl_iterate_phdr lock. |
| - Introduced a more general mechanism for platform-dependent code to |
| decide whether the main data segment should be handled separately |
| from dynamic libraries, or registered by GC_register_dynamic_libraries. |
| The latter is more reliable and easier on Linux with dl_iterate_phdr. |
| |
| Since 6.2alpha1: |
| - Fixed the completely broken FreeBSD code in 6.2alpha1. (Thanks to |
| Hironori Sakamoto for the patch.) |
| - Changed IRIX reference in dbg_mlc.c to IRIX5. (Thanks to Marcus Herbert.) |
| - Attempted to work around the problems with .S filenames and the SGI |
| compiler. (Reported by several people. Untested.) |
| - Worked around an HP/UX make issue with the GNU-style build process. |
| - Fixed the --enable-cplusplus build machinery to allow builds without |
| a C++ compiler. (That was always the intent ...) |
| - Changed the debugging allocation macros to explicitly pass the return |
| address for Linux and XXXBSD on hardware for which we can't get stack |
| traces. Use __builtin_return_address(0) to generate it when possible. |
| Some of the configuration work was cleaned up (good) and moved to gc.h |
| (bad, but necessary). This should make leak detection more useful |
| on a number of platforms. (Thanks to Fabian Thylman for the suggestion.) |
| - Fixed compilation problems in dbg_mlc.c with GC_ADD_CALLER. |
| - Bumped revision number for dynamic library. |
| |
| Since 6.2alpha2: |
| - Don't include execinfo.h in os_dep.c when it's not needed, and may not exist. |
| |
| Since 6.2alpha3: |
| - Use LINUX_STACKBOTTOM for >= glibc2.2 on Linux/MIPS. (See Debian bug |
| # 177204) |
| - Integrated Jeff Sturm and Jesse Rosenstock's MACOSX threads patches. |
| - Integrated Grzegorz Jakacki's substantial GNU build patch. "Make dist" |
| should now work for the GNU build process. Documentation files |
| are installed under share/gc. |
| - Tweaked gc_cpp.h to again support the Borland compiler. (Thanks to |
| Rene Girard for pointing out the problems.) |
| - Updated BCC_MAKEFILE (thanks to Rene Girard). |
| - Added GC_ASSERT check for minimum thread stack size. |
| - Added --enable-gc-assertions. |
| - Added some web documentation to the distribution. Updated it in the |
| process. |
| - Separate gc_conf_macros.h from gc.h. |
| - Added generic GC_THREADS client-defined macro to set the appropriate |
| GC_XXX_THREADS internal macro. (gc_config_macros.h.) |
| - Add debugging versions of _ignore_off_page allocation primitves. |
| - Moved declarations of GC_make_closure and GC_debug_invoke_finalizer |
| from gc.h to gc_priv.h. |
| - Reset GC_fail_count even if only a small allocation succeeds. |
| - Integrated Brian Alliet's patch for dynamic library support on Darwin. |
| - gc_cpp.h's gc_cleanup destructor called GC_REGISTER_FINALIZER_IGNORE_SELF |
| when it should have called the lower case version, since it was |
| explicitly computing a base pointer. |
| |
| Since 6.2alpha4: |
| - GC_invoke_finalizers could, under rare conditions, set |
| GC_finalizer_mem_freed to an essentially random value. This could |
| possibly cause unbounded heap growth for long-running applications |
| under some conditions. (The bug was introduced in 6.1alpha5, and |
| is not in gcc3.3. Thanks to Ben Hutchings for finding it.) |
| - Attempted to sanitize the various DLL macros. GC_USE_DLL disappeared. |
| GC_DLL is used instead. All internal tests are now on GC_DLL. |
| README.macros is now more precise about the intended meaning. |
| - Include DllMain in the multithreaded win32 version only if the |
| collector is actually built as a dll. (Thanks to Mohan Embar for |
| a version of the patch.) |
| - Hide the cygwin threadAttach/Detach functions. They were violating our |
| namespace rules. |
| - Fixed an assertion in GC_check_heap_proc. Added GC_STATIC_ASSERT. |
| (Thanks again to Ben Hutchings.) |
| - Removed some obsolete definitions for Linux/PowerPC in gcconfig.h. |
| - CORD_cat was not rebalancing unbalanced trees in some cases, violating |
| a CORD invariant. Also tweaked the rebalancing rule for |
| CORD_cat_char_star. (Thanks to Alexandr Petrosian for the bug report |
| and patch.) |
| - Added hand-coded structured exception handling support to mark.c. |
| This should enable support of dynamic libraries under win32 with |
| gcc-compiled code. (Thanks to Ranjit Mathew for the patch.) |
| Turned on dynamic library scanning for win32/gcc. |
| - Removed some remnants of read wrapping. (Thanks to Kenneth Schalk.) |
| GC_USE_LD_WRAP ws probably broken in recent versions. |
| - The build could fail on some platforms since gcconfig.h could include |
| declarations mentioning ptr_t, which was not defined, e.g. when if_mach |
| was built. (Thanks to Yann Dirson for pointing this out.) Also |
| cleaned up tests for GC_PRIVATE_H in gcconfig.h a bit. |
| - The GC_LOOP_ON_ABORT environment variable interfered with incremental |
| collection, since the write fault handler was erroneously overridden. |
| Handlers are now set up in the correct order. |
| - It used to be possible to call GC_mark_thread_local_free_lists() while |
| the world was not stopped during an incremental GC. This was not safe. |
| Fortunately, it was also unnecessary. Added GC_world_stopped flag |
| to avoid it. (This caused occasional crashes in GC_set_fl_marks |
| with thread local allocation and incremental GC. This probably happened |
| primarily on old, slow multiprocessors.) |
| - Allowed overriding of MAX_THREADS in win32_threads.c from the build |
| command line. (Patch from Yannis Bres.) |
| - Taught the IA64/linux code to determine the register backing store base from |
| /proc/self/maps after checking the __libc symbol, but before guessing. |
| (__libc symbols are on the endangered list, and the guess is likely to not |
| always be right for 2.6 kernels.) Restructured the code to read and parse |
| /proc/self/maps so it only exists in one place (all platforms). |
| - The -DUSE_PROC_FOR_LIBRARIES code was broken on Linux. It claimed that it |
| also registered the main data segment, but didn't actually do so. (I don't |
| think anyone actually uses this configuration, but ...) |
| - Made another attempt to get --enablecplusplus to do the right thing. |
| Since there are unavoidable problems with C programs linking against a |
| dynamic library that includes C++ code, I separated out the c++ code into |
| libgccpp. |
| |
| Since 6.2alpha5: |
| - There was an extra underscore in the name of GC_save_registers_in_stack |
| for NetBSD/SPARC. (Thanks to Jaap Boender for the patch.) |
| - Integrated Brian Alliet's patch for Darwin. This restructured the |
| linuxthreads/pthreads support to separate generic pthreads support |
| from more the system-dependent thread-stopping code. I believe this |
| should make it easier to eliminate the code duplication between |
| pthreads platforms in the future. The patch included some other |
| code cleanups. |
| - Integrated Dan Bonachea's patch to support AIX threads. This required |
| substantial manual integration, mostly due to conflicts with other |
| recent threads changes. It may take another iteration to |
| get it to work. |
| - Removed HPUX/PA-RISC support from aix_irix_threads.c. It wasn't used |
| anyway and it cluttered up the code. And anything we can do to migrate |
| towards generic pthreads support is a good thing. |
| - Added a more explicit test for tracing of function arguments to test.c. |
| (Thanks to Dan Grayson.) |
| - Added Akira Tagoh's PowerPC64 patch. |
| - Fixed some bit rot in the Cygwin port. (Thanks to Dan Bonachea for |
| pointing it out.) Gc.h now includes just windows.h, not winbase.h. |
| - Declared GC_save_regs_in_stack() in gc_priv.h. Remove other declarations. |
| - Changed --enable-cplusplus to use automake consitionals. The old way |
| confused libtool. "Make install" didn't work correctly for the old version. |
| Previously --enable-cplusplus was broken on cygwin. |
| - Changed the C version of GC_push_regs to fail at compile time if it is |
| generated with an empty body. This seems to have been the cause of one |
| or two subtle failures on unusual platforms. Those failures should |
| now occur at build time and be easily fixable. |
| |
| Since 6.2alpha6: |
| - Integrated a second round of Irix/AIX patches from Dan Bonachea. |
| Renamed mips_sgi_mach_dep.S back to mips_sgi_mach_dep.s, since it requires |
| the Irix assembler to do the C preprocessing; gcc -E doesn't work. |
| - Fixed Makefile.direct for DARWIN. (Thanks to Manuel Serrano.) |
| - There was a race between GC_pthread_detach and thread exit that could |
| result in a thread structure being deallocated by GC_pthread_detach |
| eventhough it was still needed by the thread exit code. (Thanks to |
| Dick Porter for the small test case that allowed this to be debugged.) |
| - Fixed version parsing for non-alpha versions in acinclude.m4 and |
| version checking in version.h. |
| |
| Since 6.2: |
| - Integrated some NetBSD patches forwarded to me by Marc Recht. These |
| were already in the NetBSD package. |
| - GC_pthread_create waited for the semaphore even if pthread_create failed. |
| Thanks to Dick Porter for the pthread_support.c patch. Applied the |
| analogous fix for aix_irix_threads.c. |
| - Added Rainer Orth's Tru64 fixes. |
| - The check for exceeding the thread table size in win32 threadDetach |
| was incorrect. (Thanks to Alexandr Petrosian for the patch.) |
| - Applied Andrew Begel's patch to correct some reentrancy issues |
| with dynamic loading on Darwin. |
| - GC_CreateThread() was neglecting to duplicate the thread handle in |
| the table. (Thanks to Tum Nguyen for the patch.) |
| - Pass +ESdbgasm only on PA-RISC machines with vendor compiler. |
| (Thanks to Roger Sayle for the patch.) |
| - Applied more AIX threads patches from Scott Ananian. |
| |
| Since 6.3alpha1: |
| - Reenabled I_HOLD_LOCK assertion in aix_irix_threads.h. |
| - Put back the WINABI qualifier for GC_CreateThread. (Thanks to |
| Danny Smith for the patch. 6.3alpha1 had the qualifier in one place |
| but not elsewhere, which was clearly wrong.) |
| - Sometimes explicitly define __private_extern__ before DARWIN dyld.h |
| include. (Thanks to Andreas Tobker for postting the patch.) |
| - Included signal.h from pthread_support.c. Removed GC_looping_handler, |
| which was dead code. |
| - GC_find_start was misdeclared by gc_pmark.h if PRINT_BLACK_LIST was |
| defined. (Thanks to Glauco Masotti for testing and reporting this.) |
| Changed GC_find_start to never just return 0. According to its |
| comment it doesn't, and it's unclear that's correct. |
| - GC_alloc_large had several largely compensating bugs in the |
| computation of GC_words_wasted. (It was confused about bytes vs. |
| words in two places.) |
| - Integrated Slava Sysoltev's patch to support more recent versions of |
| the Intel compiler on IA64/Linux. |
| - Changed win32 spinlock initialization to conditionally set a spin count. |
| (Emmanual Stumpf pointed out that enabling this makes a large performance |
| difference on win32 multiprocessors.) Also cleaned up the win32 spinlock |
| initialization code a bit. |
| - Fixed thread support for HP/UX/IA64. The register backing store base for |
| the main thread was sometimes not set correctly. (Thanks to Laurent |
| Morichetti.) |
| - Added -DEMPTY_GETENV_RESULTS flag to work around Wine problem. |
| - Declare GC_stack_alloc and GC_stack_free in solaris_threads.h to |
| avoid 64-bit size mismatches. (Thanks to Bernie Solomon.) |
| - Fixed GC_generic_push_regs to avoid a potential and very unfortunate |
| tail call optimization. This could lead to prematurely reclaimed |
| objects on configurations that used the generic routine and the new |
| build infrastructure (which potentially optimizes mach_dep.c). |
| This was a serious bug, but it's unclear whether it has resulted in |
| any real failures. |
| - Fixed CORD_str to deal with signed characters. (Thanks to Alexandr |
| Petrosian for noticing the problem and supplying the patch.) |
| - Merged a couple of NOSYS/ECOS tests into os_dep.c from gcj. (Thanks |
| to Anthony Green.) |
| - Partially merged a win32 patch from Ben Hutchings, and substantially |
| revised other parts of win32_threads.c. It had several problems. |
| Under MinGW with a statically linked library, the main thread was |
| not registered. Cygwin detached threads leaked thread descriptors. |
| There were several race conditions. For now, unfortunately the |
| static threads limit remains, though we increased it, and made table |
| traversal cost depend on the actual thread count. |
| There is also still some code duplication with pthread_support.c. |
| (Thread descriptors did become much smaller, since Ben Hutchings |
| removed the thread context from them.) |
| - Integrated a Solaris configure.in patch from Rainer Orth. |
| - Added GC_IGNORE_FB and associated warning to very partially address |
| the issue of the collector treating a mapped frame buffer as part |
| of the root set. (Thanks to David Peroutka for providing some |
| insight. More would be helpful. Is there anything that can be used |
| to at least partially identify such memory segments?) |
| |
| Since 6.3alpha2: |
| - Removed -DSMALL_CONFIG from BCC_MAKEFILE. |
| - Changed macros to test for an ARM processor (Patch from Richard Earnshaw.) |
| - Mostly applied a DJGPP patch from Doug Kaufman. Especially Makefile.dj |
| had suffered from serious bit rot. |
| - Rewrote GC_apply_to_maps, eliminating an off-by-one subscript error, |
| and a call to alloca (for lcc compatibility). |
| - Changed USE_MUNMAP behavior on posixy platforms to immediately remap |
| the memory with PROT_NONE instead of unmapping it. The latter risks |
| an intervening mmap grabbing the address space out from underneath us. |
| Updated this code to reflect a cleaner patch from Ulrich Drepper. |
| - Replaced _T with _Tp in new_gc_alloc.h to avoid a MACOS X conflict. |
| (Patch from Andrew Begel.) |
| - Dynamically choose whether or not lock should spin on win32. (Thanks |
| to Maurizio Vairani for the patch.) This may be a significant performance |
| improvement for win32. |
| - Fix Makefile.direct to actually include NT_STATIC_THREADS_MAKEFILE |
| in the distribution. (Again thanks to Maurizio Vairani.) |
| - Maybe_install_looping_handler() was accidentally exported, violating |
| our name space convention. |
| - Made os_dep.c use sigsetjmp and SA_NODEFER for NetBSD. (Thanks to |
| Christian Limpach.) (I generalized the patch to use sigsetjmp on all |
| UNIX_LIKE platforms, admittedly a slightly risky move. But it may avoid |
| similar problems on some other platforms. I also cleaned up the defn |
| of UNIX_LIKE a bit. - Hans) |
| - Integrated Andrew Begel's Darwin threads patch, adjusted according to |
| some of Fergus Hendersons's comments. (Patch didn't apply cleanly, |
| errors are possible.) |
| - Added another test or two for the Intel 8.0 compiler to avoid |
| confusing it with gcc. The single-threaded collector should now build |
| with icc, at least on ia64. |
| |
| Since 6.3alpha3: |
| - USE_MMAP was broken by confusion in the code dealing with USE_MMAP_ANON. |
| (This was pointed out, and fixes were suggested by several other people.) |
| - Darwin supprt was broken in alpha3 as a result of my misintegration of |
| Andrew Begel's patches. Fixed with another patch from Andrew Begel. |
| - A new sanity check in pthread_stop_world.c:GC_push_all_stacks() was |
| overly aggressive. We may collect from an unregistered thread during |
| thread creation. Fixed by explicitly checking for that case. (Added |
| GC_in_thread_creation.) |
| |
| Since 6.3alpha4: |
| - Fix & vs && typo in GC_generic_malloc and |
| GC_generic_malloc_ignore_off_page. (Propagated from the gcc tree.) |
| - Removed SA_NODEFER hack from NetBSD and Solaris write-protect handler. |
| (According to Christian Limpach, the NetBSD problem is fixed. |
| Presumably so is the Solaris 2.3 problem.) |
| - Removed placement delete from gc_cpp.h for the SGI compiler. |
| (Thanks to Simon Gornall for the patch.) |
| - Changed semantics of the GC_IGNORE_FB environment variable, based |
| on experimentation by Nicolas Cannasse pointing out that the old |
| interpretation was useless. We still need help in identifying win32 |
| graphics memory mappings. The current "solution" is a hack. |
| - Removed "MAKEOVERRIDES =" from Makefile.am and thus Makefile.in. |
| It probably made more sense in the gcc context. |
| - Explicitly ensure that NEED_FIND_LIMIT is defined for {Open,Net}BSD/ELF. |
| - Replaced USE_HPUX_TLS macro by USE_COMPILER_TLS, since gcc often |
| supports the same extension on various platforms. |
| - Added some basic (completely untested) defines for win64, in support |
| of future work. |
| - Declared GC_jmp_buf in os_dep.s as JMP_BUF instead of jmp_buf, fixing |
| a memory overwrite bug on Solaris and perhaps other platforms. |
| - Added 0 != __libc_stack_end test to GC_linux_stack_base. (Thanks to Jakub |
| Jelinek, both for the patch, and for explaining the problem to me.) |
| Otherwise "prelink"ing could cause the collector to fail. |
| - Changed default thread local storage implementation to USE_PTHREAD_SPECIFIC |
| for HP/UX with gcc. The compiler-based implementation appears to work |
| only with the vendor compiler. |
| - Export GC_debug_header_size and GC_USR_PTR_FROM_BASE from gc_mark.h, |
| making client mark code cleaner and less dependent on GC version. |
| - Export several new procedures and GC_generic_malloc from gc_mark.h |
| to support user-defined kinds. Use the new procedures to replace existing |
| code in gcj_mlc.c and typd_mlc.c. |
| - Added support for GC_BACKTRACES. |
| - Fixed a remaining problem in CORD_str with signed characters. (Thanks |
| to Alexandr Petrosian for the patch.) |
| - Removed supposedly redundant, but very buggy, definitions of finalizer |
| macros from javaxfc.h. Fortunately this file probably has no users. |
| The correct declarations were already in gc.h. |
| - Also need to set GC_in_thread_creation while waiting for GC during |
| thread termination, since it is also possible to collect from an |
| unregistered thread in that case. |
| - Define NO_GETENV for Windows CE, since getenv doesn't appear to exist. |
| + some other minor WinCE fixes. (Thanks to Alain Novak.) |
| - Added GC_register_describe_type_fn. |
| - Arrange for debugging finalizer registration to ignore non-heap |
| registrations, since the regular version of the routine also behaves |
| that way. |
| - GC_gcj_malloc and friends need to check for finalizers waiting to be run. |
| One of the more obscure allocation routines with missing a LOCK() call. |
| - Fixed cvtres invocations in NT_MAKEFILE and NT_STATIC_THREADS_MAKEFILE |
| to work with VS.NET. |
| - Cleaned up GC_INIT calls in test. Updated gc.man to encourage GC_INIT |
| use in portable code. |
| - Taught the GC to use libunwind if --enable-full-debug is specified on |
| IA64 and libunwind is present. |
| - The USE_MUNMAP code could get confused about the age of a block and |
| prematurely unmap it. GC_unmap_old had a bug related to wrapping of |
| GC_gc_no. GC_freehblk and GC_merge_unmapped didn't maintain |
| hb_last_reclaimed reasonably when blocks were merged. The code was |
| fixed to reflect original intent, but that may not always be an |
| improvement. See todo list item. |
| |
| Since 6.3alpha5: |
| - Define USE_GENERIC_PUSH_REGS for NetBSD/M68K. |
| - Fixed the X86_64 PREFETCH macros to correctly handle ia32e (which uses |
| different prefetch instructions from AMD64). (Thanks to H.J. Lu.) |
| - GC_config_macros.h did not correctly define GC_WIN32_THREADS from |
| GC_THREADS. |
| - Added simple_example.html. |
| - Merged Andrew Gray's patch to correctly restore signal handlers on |
| FreeBSD. |
| - Merged a patch from Andreas Jaeger to deal with prefetch-related warnings |
| on x86-64. Added some other casts so that the PREFETCH macros |
| always get a ptr_t argument. Removed some casts inthe PREFETCH |
| implementations. |
| - At Jesse Jones suggestion: Added a header guard for gc_allocator.h |
| and changed GC_debug_free to clobber contents of deallocated object. |
| - The signal masking code in pthread_stop_world.c contained some errors. |
| In particular SIGSEGV was masked in the handler, in spite of the fact that |
| it wrote to the heap. This could lead to an uncaught SIGSEGV, which |
| apparently became much more likely in Linux 2.6. Also fixed some |
| typos, and reduced code duplication in the same area. |
| - Remove ltconfig, clean up configure messages for DGUX (thanks to |
| Adrian Bunk for the patches). |
| - Integrated NetBSD/OpenBSD patches from Marc Recht and Matthias Drochner. |
| |
| Since gc6.3alpha6: |
| - Compile test_cpp.cc with CXXCOMPILE instead of COMPILE. |
| - Very large allocations could cause a collector hang. Correct |
| calculation of GC_collect_at_heapsize. |
| - GC_print_hblkfreelist printed some bogus results if USE_MUNMAP |
| was defined. |
| - The generic GC_THREADS macro didn't work correctly on Solaris, |
| since the implementation failed to include gc_config_macros.h |
| before deciding whether or not to compile the rest of the file. |
| - Threadlibs.c failed to expand the generic GC_THREADS macro. |
| - Correct MacOSX thread stop code. (Thanks to Dick Porter.) |
| - SMALL_OBJ definition was off by one. This could cause crashes |
| at startup. (Thanks to Zoltan Varga for narrowing this down to |
| a trivial test case.) |
| - Integrate Paolo Molara's patch to deal with a race in the Darwin |
| thread stopping code. |
| - Changed X86_64 implementation to use SA_SIGINFO in the MPROTECT_VDB |
| implementation. The old approach appears to have been broken by |
| recent kernels. |
| - Add GC_ATTR_UNUSED to eliminate a warning in gc_allocator.h. (Thanks |
| to Andrew Begel.) |
| - Fix GC_task_self declaration in os_dep.c. (Thanks to Andrew Pinski.) |
| - Increase INITIAL_BUF_SZ in os_dep.c for Solaris /proc reads. |
| |
| Since 6.3: |
| - Merge gcconfig.h changes from gcc tree. |
| - Unconditionally include gc_priv.h in solaris_pthreads.c, win32_threads.h, |
| aix_irix_threads.c, and solaris_threads.c to get thread definitions. |
| - Start marker threads in GC_thr_init, so that they get started even |
| if no other threads are ever started. (Oddly enough, the parallel |
| collector worked correctly, though not well, with no helper threads.) |
| - Go ahead and split large blocks in GC_allochblk_nth if GC_dont_gc |
| is set. (Thanks to Alexander Petrossian.) |
| - GC_PRINT_BACK_HEIGHT would deadlock with thread support. |
| - Let in_progress_space in backgraph.s grow dynamically. |
| - Fix README.solaris2. The GC_thr_init() hack doesn't work anymore. |
| - Convert GC_finalizer_mem_freed to bytes in allchblk.c. |
| - Add missing declaration for GC_generic_malloc_words_small_inner. |
| Without it, s390x breaks. (Thanks to Ulrich Weigand.) |
| - Applied several MacOSX patches to support older tool chains. |
| (Thanks to Stefan Ring.) |
| - Bug fix for NetBSD/amd64. (Thanks to Marc Recht.) Add NetBSD/sh3 |
| support. (Thanks to Uchiyama Yasushi.) |
| - Fixed an uninitialized variable in cordprnt.c. (Thanks to gcc for |
| providing the warning.) |
| - Eliminated some, but not all, gcc -Wall warnings. |
| - Changed some old style casts to reinterpret_cast in new_gc_alloc.h. |
| (Thanks to Dan Grayson.) |
| - GC_extend_size_map shouldn't adjust for GC_all_interior_pointers if |
| GC_DONT_ADD_BYTE_AT_END is set. |
| - Changed some (long) casts to (word) in preparation for win64. |
| (Thanks to Peter Colson.) |
| - Changed "int stack_size" declaration in pthread_support.c to use |
| size_t. (Only mattered with GC_ASSERTIONS enabled.) |
| - Added CRIS (etrax) support. (Thanks to Simon Posnjak and |
| Hans-Peter Nilsson.) |
| - Removed GC_IGNORE_FB frame buffer recognition, and replaced |
| it with a check that the mapping type is MEM_IMAGE. |
| In theory, this should work much better, but it is a high |
| risk change for win32. (Thanks to Ashley Bone for the crucial |
| experimental data behind this, and to Rutger Ovidus for |
| some further experiments.) |
| - Fixed print_block_list to print the correct kind number for |
| STUBBORN. (Thanks to Rutger Ovidus.) |
| - GC_allochblk_nth incremented GC_words_wasted by bytes rather than |
| words. |
| - Consider GC_words_wasted in GC_adj_words_allocd only if it is within |
| reason. (A hack to avoid some extremely unlikely scenarios in which |
| we manage to allocate only "wasted" space. 7.0 has a better fix.) |
| - Changed PowerPC GC_clear implementation to use lwsync instead of |
| eieio, since the documentation recommends against eieio, and |
| it seems to be incorrect if the preceding memory op is a load. |
| - Fixed print_block_list to print the correct kind number for |
| STUBBORN. (Thanks to Rutger Ovidus.) |
| - Have configure.in generate an error if it is asked to support |
| pthreads, but doesn't know how to. |
| - Added Kazuhiro Inaoka's patch for Renesas M32R support. |
| - Have the GNU build mechanism link with -ldl. Rename THREADLIBS |
| to THREADDLLIBS to reflect this. (Thanks to Sven Verdoolaege.) |
| - Added Hannes Mehnert's patch for FreeBSD/SPARC support. |
| - Merged some FreeBSD specific patches to threadlibs.c and dyn_load.c. |
| (Thanks tp John Merryweather Cooper.) |
| - Define MPROTECT_VDB on MACOSX only if threads are being used, since the |
| dirty page tracking mechanism uses threads. (This avoids an undefined |
| reference to _GC_darwin_register_mach_handler_thread.) |
| - By popular demand, use __libc symbols only if we are built with |
| USE_LIBC_PRIVATES, which is off by default, and not otherwise documented. |
| - Ignore GC_enable_incremental() requests when KEEP_BACK_PTRS is set. |
| The GC itself will dirty lots of pages in this cases, probably making |
| it counterproductive on all platforms. And the DARWIN port crashes. |
| |
| Since GC6.4: |
| - Integrated Paolo Molaro's patch to deal with EINTR in sem_wait. |
| - Make GC_approx_sp() write to dummy location to ensure that stack |
| is grown here, when sp looks reasonable, rather than later, when |
| it might look like a bad memory reference. (Problem was never |
| observed that I know of. But on rereading the code it seemed |
| dubious.) |
| - Separate out GC_with_callee_saves_pushed and sometimes call |
| it from GC_suspend_handler in pthread_stop_world.c. Callee-save |
| register values sometimes failed to get traced under HP/UX on |
| PA-RISC. Linux/IA64 had the same problem, though non-stacked |
| callee-save registers seem to be so rarely used there that nobody |
| ever noticed. |
| - Integrated an ancient Darwin powerpc_darwin_machine_dep.s patch |
| from Andreas Tobler, which I had lost. |
| - Fix compare_and_exchange implementation for gcc/IA64 to deal with |
| pickier compiler versions. |
| - Fixed Itanium 32-bit ABI support (HP/UX). In particular, the |
| compare_and_exchange implementation didn't consider that possibility. |
| - Undefine GC_pthread_detach in win32_threads.c. (Thanks to |
| Tagliapietra Tommaso.) |
| - Fixed inclusion of frame.h for NETBSD in os_dep.c. |
| - Applied Dan Bonachea's patch to use mmap on AIX. |
| - Several fixes to resurrect the Irix port on recent OS versions. |
| - Change ALPHA to use LINUX_STACKBOTTOM. |
| - Change SPARC64/LINUX to also use LINUX_STACKBOTTOM. Deal with potential |
| bad values of __libc_stack_end on that platform. (Thanks to David Miller.) |
| - Relax gctest to allow larger heap if ALIGN_DOUBLE isn't set. |
| (Unnecessary in 7.0) |
| - Force a define of __STDC__=0 for the IBM compiler on AIX, so that |
| we get prototypes. (Unnecessary in 7.0) |
| - GC_INIT definition for AIX and CYGWIN referred to DATASTART and DATAEND |
| which are only defined in private include files. |
| - Integrated some small gcconfig.h patches from Dan Bonachea. Also |
| relaxed assertion about FreeBSD stack size in pthread_support.c. |
| - Integrated Andrew Begel's darwin_stop_world.c patch for 64-bit |
| support. This may need additional work. |
| - Avoided potentially infinite recursion in GC_save_callers if |
| the system backtrace calls malloc. The workaround currently requires |
| __thread support if this code is used with threads. |
| - Avoided another similar infinite recursion by conditionally |
| invoking GC_save_callers in alloc.c. (Thanks to Matthias Andree |
| for helping to track down both of these.) |
| - Removed all traces of aix_irix_threads.c. AIX and Irix now use |
| pthread_support.c and pthread_stop_world.c. The old code appeared |
| to be unreliable for AIX, and was not regularly maintained. |
| - On Irix, ignore segments with MA_FETCHOP or MA_NOTCACHED attributed; |
| they're not always safe to read. |
| - Fixed a previously vacuous assertion (diagnosed by the SGI compiler) |
| in GC_remove_from_fl. |
| - Fix stack_size assertion in GC_pthread_create. |
| - Fix assertion in GC_steal_mark_stack. |
| |
| Since 6.5 |
| - Fix CPU count detection for Irix and FreeBSD. (Thanks to Dan Bonachea.) |
| - Integrate Dan Bonachea's patch for the IBM XLC compiler on Darwin. |
| - Integrated Andreas Tobler's FreeBSD/PowerPC patch. |
| - Don't access the GC thread structure from the restart handler. It's |
| unsafe, since the handler may run too late. (Thanks to Ben Maurer for |
| tracking this down.) |
| - Applied Christian Thalinger's patch to change comment syntax in |
| alpha_mach_dep.S. |
| - Added test for GC_no_dls in GC_dyld_image_add for DARWIN. (Thanks to |
| Juan Jose Garcia Ripoli). |
| - Use LINUX_STACKBOTTOM for Linux/SH and LINUX/ARM. (Thanks to Sugioka |
| Toshinobu and Christian Thalinger.) |
| - Rewrote GC_parse_map_entry. This assumed a fixed column layout of |
| /proc/self/maps on Linux. This ceased to be true about 2 years ago. |
| The old code is probably quite problemetic with -DREDIRECT_MALLOC. It |
| is also used by default for IA64, though I haven't seen actual failures |
| there. |
| - More consistently define HBLKSIZE to 4096 on 64 bit architectures with |
| 4K pages. (Thanks to Andrew Haley.) |
| - With win32 threads, GC_stop_world needs to acquire GC_write_cs. (Thanks |
| to Ben Hutchings for the observation and patch.) |
| - Move up struct callinfo declaration to make gcc 4.0.2. happy. |
| |
| To do: |
| - The USE_MUNMAP code should really use a separate data structure |
| indexed by physical page to keep track of time since last use of |
| a page. Using hblk headers means we lose track of ages when |
| blocks are merged, and we can't unmap pages that have been allocated and |
| dropped by the blacklisting code. I suspect both of these matter. |
| - A dynamic libgc.so references dlopen unconditionally, but doesn't link |
| against libdl. |
| - GC_proc_fd for Solaris is not correctly updated in response to a |
| fork() call. Thus incremental collection in the child won't work |
| correctly. (Thanks to Ben Cottrell for pointing this out.) |
| - --enable-redirect-malloc is mostly untested and known not to work |
| on some platforms. |
| - There seem to be outstanding issues on Solaris/X86, possibly with |
| finding the data segment starting address. Information/patches would |
| be appreciated. |
| - Very large root set sizes (> 16 MB or so) could cause the collector |
| to abort with an unexpected mark stack overflow. (Thanks again to |
| Peter Chubb.) NOT YET FIXED. Workaround is to increase the initial |
| size. |
| - The SGI version of the collector marks from mmapped pages, even |
| if they are not part of dynamic library static data areas. This |
| causes performance problems with some SGI libraries that use mmap |
| as a bitmap allocator. NOT YET FIXED. It may be possible to turn |
| off DYNAMIC_LOADING in the collector as a workaround. It may also |
| be possible to conditionally intercept mmap and use GC_exclude_static_roots. |
| The real fix is to walk rld data structures, which looks possible. |
| - Incremental collector should handle large objects better. Currently, |
| it looks like the whole object is treated as dirty if any part of it |
| is. |
| |
