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Author SHA1 Message Date
Gareth Rees
9d244d3e14 Refactor arenapeekseg so that it maintains the mps invariants by scanning the segment if necessary. arenaread is now a thin wrapper around arenapeekseg. new function arenawrite is now the corresponding wrapper around arenapokeseg. 
MRG reference segments inherit from GCSeg (not MutatorSeg) and so don't have hardware barriers. Instead, the code implements software barriers by always using ArenaRead and ArenaWrite.

Copied from Perforce
 Change: 193990
 2018-06-19 16:25:52 +01:00
Gareth Rees
fd1d022908 Segment class gcseg no longer implements hardware barriers; these are implemented by new subclass mutatorseg, which is now used everywhere that gcseg was used formerly. the idea is that in a future change mrgrefseg will inherit from gcseg instead of mutatorseg. 
Copied from Perforce
 Change: 193981
 2018-06-19 14:45:42 +01:00
Gareth Rees
c4949fb608 Postpone some lookups until it is known that they are needed (avoiding the lookups in the common case where they are not). 
Copied from Perforce
 Change: 193975
 2018-06-19 12:27:07 +01:00
Gareth Rees
89a4b0378a Simplify the wasmarked protocol. 
Copied from Perforce
 Change: 193940
 2018-06-18 20:03:13 +01:00
Gareth Rees
76b082ab3c Assertions on the critical path. 
Copied from Perforce
 Change: 193879
 2018-06-18 13:17:42 +01:00
Gareth Rees
f5ffaeb349 Mach_thread_self() can in theory "return mach_port_null if a resource shortage prevented the reception of the send right" so add a check in each case. (there's nothing we can do about it but at least we can notice.) 
Copied from Perforce
 Change: 193831
 2018-06-15 12:54:28 +01:00
Gareth Rees
e9d454d796 It's safe to register a thread multiple times on macos, so there is no need for the guard. 
Copied from Perforce
 Change: 193828
 2018-06-15 12:44:51 +01:00
Gareth Rees
307bc47730 Rename "mac os x" and "os x" to "macos", except for a few cases where for historical accuracy we want to continue to refer to the former name. 
Copied from Perforce
 Change: 193821
 2018-06-15 12:15:36 +01:00
Gareth Rees
81874fdf08 Fix typo. 
Copied from Perforce
 Change: 193811
 2018-06-15 11:15:42 +01:00
Gareth Rees
b0a73a5c71 Refactor atfork code to improve separation of concerns. 
Copied from Perforce
 Change: 193806
 2018-06-15 10:58:33 +01:00
Gareth Rees
4eeac719ad Start the collection and dereference the objects in the parent as well as the child. 
Copied from Perforce
 Change: 193800
 2018-06-15 10:06:59 +01:00
Gareth Rees
ad432cf7c4 Fix issues identified in review by nb. 
Copied from Perforce
 Change: 193793
 2018-06-14 19:31:30 +01:00
Gareth Rees
b1ac192a9a Update design history. restore accidentally removed check. 
Copied from Perforce
 Change: 193787
 2018-06-14 17:55:03 +01:00
Gareth Rees
6fda834973 Improve comments. 
Copied from Perforce
 Change: 193783
 2018-06-14 17:44:41 +01:00
Gareth Rees
612b44060f Fix ansi build. 
Copied from Perforce
 Change: 193769
 2018-06-14 16:58:24 +01:00
Gareth Rees
b5e1965b3d Avoid compilation errors from latest msvc. 
Copied from Perforce
 Change: 193768
 2018-06-14 16:54:33 +01:00
Gareth Rees
f92f645f63 Support for fork on linux and freebsd. 
Copied from Perforce
 Change: 193765
 2018-06-14 16:47:23 +01:00
Gareth Rees
e70b4c273c Take locks before fork(), release them in the parent and reinitialize them in the child. 
Add forktest target to the Xcode project.
Write design for fork safety and cross-reference from the code.
Update release notes.

Copied from Perforce
 Change: 193760
 2018-06-14 16:25:08 +01:00
Gareth Rees
2401957e62 Extend forktest so that it does allocation before the fork and collection afterwards; this ensures that we hit the read barrier and thus exercise the exception handling. 
After forking in the child, re-create exception port and exception thread, and re-register the (only) thread with that port.

Copied from Perforce
 Change: 193755
 2018-06-14 12:54:35 +01:00
Gareth Rees
8146970622 Add fork test case (fails on os x if pthread_atfork is not called). 
pthread_atfork handlers on OS X: in the child, update the mach port for the forking thread and move all other threads to the dead ring.

Copied from Perforce
 Change: 193746
 2018-06-13 17:09:07 +01:00
Gareth Rees
9de5c1dfbe Avoid using deprecated function mps_fix and deprecated macro mps_fix in the test cases; use mps_fix12 instead. 
Copied from Perforce
 Change: 193726
 2018-06-13 13:59:14 +01:00
Gareth Rees
7c159fd2f8 Remove undocumented plinth function mps_lib_assert_fail_expr and rewrite assertp macro to call documented plinth function mps_lib_assert_fail instead. 
Copied from Perforce
 Change: 192941
 ServerID: perforce.ravenbrook.com
 2017-03-04 11:17:11 +00:00
Gareth Rees
f6356fc2ef Remove used epvmdefaultsubsequentsegsize. 
Copied from Perforce
 Change: 192938
 ServerID: perforce.ravenbrook.com
 2017-03-04 11:02:31 +00:00
Gareth Rees
38dae4d616 Documentation improvements. 
Copied from Perforce
 Change: 192905
 ServerID: perforce.ravenbrook.com
 2017-02-18 09:38:15 +00:00
Gareth Rees
1c5e8269a8 Fix typos. 
Copied from Perforce
 Change: 192890
 ServerID: perforce.ravenbrook.com
 2017-02-11 11:30:15 +00:00
Gareth Rees
cb23106273 Add "cold end" and "hot end" to the glossary index. 
Copied from Perforce
 Change: 192660
 ServerID: perforce.ravenbrook.com
 2016-10-20 13:52:30 +01:00
Gareth Rees
148f538510 Merge design.mps.class-interface into design.mps.pool (as suggested by pekka p. pirinen on 1999-07-20). 
Bring pool class method descriptions up to date.
Document bufferClass, bufferFill, bufferEmpty, totalSize, freeSize methods.
Document generic instance methods at design.mps.protocol.method.

Copied from Perforce
 Change: 192642
 ServerID: perforce.ravenbrook.com
 2016-10-19 15:34:35 +01:00
Gareth Rees
79d301f528 Cherry-pick change 192595 from custom/cet/main, removing mps_addr_object. this function failed to solve the problem of decoding the stack on 64-bit windows, because the stack may need to be decoded after an mps assertion failure, in which case the arena lock is held and mps_addr_object cannot be called. we eventually solved the problem in a different way (using mps_arena_postmortem) and mps_addr_object is no longer used. 
Copied from Perforce
 Change: 192637
 ServerID: perforce.ravenbrook.com
 2016-10-19 14:13:38 +01:00
Gareth Rees
587a3efb20 Remove unused pool class methods tracebegin and traceend. 
Remove unused event AMCTraceEnd.
The fixEmergency method must have the same type as the fix method because of how they are used.

Copied from Perforce
 Change: 192636
 ServerID: perforce.ravenbrook.com
 2016-10-19 14:07:20 +01:00
Gareth Rees
7f18fa9802 Use nextmethod to call the superclass init method, instead of calling poolabsinit directly. regularize the error handling. 
Copied from Perforce
 Change: 192631
 ServerID: perforce.ravenbrook.com
 2016-10-19 11:34:04 +01:00
Gareth Rees
4a5bfd071a Bring design.mps.message up to date and move it from old to current. 
Copied from Perforce
 Change: 192625
 ServerID: perforce.ravenbrook.com
 2016-10-18 22:35:13 +01:00
Gareth Rees
1b6774b850 Regularize the signature comments, for the benefit of design.mps.sig.test.uniq. 
Copied from Perforce
 Change: 192620
 ServerID: perforce.ravenbrook.com
 2016-10-18 18:30:50 +01:00
Gareth Rees
c5869484e5 Remove design documents for unsupported operating systems sunos, solaris and osf/1 (protsu, sso1al, vmo1, and vmso). 
Update thread-safety and version-library design documents and move them from old to current.

Copied from Perforce
 Change: 192617
 ServerID: perforce.ravenbrook.com
 2016-10-18 18:30:09 +01:00
Gareth Rees
c6a0bd0f34 Remove unused functions landcreate and landdestroy. 
Copied from Perforce
 Change: 192603
 ServerID: perforce.ravenbrook.com
 2016-10-14 22:30:11 +01:00
Gareth Rees
0c2db358de Split generic mutator context module into two parts: one for generic operating system (prmcan.c) and one for generic architecture (prmcanan.c). 
Copied from Perforce
 Change: 192583
 ServerID: perforce.ravenbrook.com
 2016-10-14 13:25:14 +01:00
Gareth Rees
2b4ae16b87 Add discriminator to mutatorcontextstruct and implement mutatorcontextinitfault and mutatorcontextinitthread on posix/linux. 
Copied from Perforce
 Change: 192577
 ServerID: perforce.ravenbrook.com
 2016-10-14 12:39:50 +01:00
Gareth Rees
bcd592b96b Add discriminator to mutatorcontextstruct and implement mutatorcontextinitfault and mutatorcontextinitthread on os x. 
Copied from Perforce
 Change: 192572
 ServerID: perforce.ravenbrook.com
 2016-10-14 12:04:01 +01:00
Gareth Rees
d38c74a0b2 New modulefile prmcw3.c avoids duplication of code between prmcw3i3.c and prmcw3i6.c. 
Implement MutatorContextCheck on Windows. Add AVERT(MutatorContext, context) in PoolAccess and other functions.
Document initialization functions MutatorContextInitFault and MutatorContextInitThread and implement them on Windows.
Add a union discriminator to MutatorContextStruct on Windows so that we don't accidentally try to get the stack pointer from a fault context, or the exception address from a thread context.

Copied from Perforce
 Change: 192567
 ServerID: perforce.ravenbrook.com
 2016-10-14 11:53:26 +01:00
Gareth Rees
bcfbaaf3e4 Initialization and checking of mutatorcontext data structures. 
New files prmcix.c and prmcxc.c avoid duplicated code.

Copied from Perforce
 Change: 192562
 ServerID: perforce.ravenbrook.com
 2016-10-13 23:13:40 +01:00
Gareth Rees
d82fc68bde Use protsgix.c on linux and delete protli.c. 
Copied from Perforce
 Change: 192556
 ServerID: perforce.ravenbrook.com
 2016-10-13 21:24:04 +01:00
Gareth Rees
1d65260d5b In protsgix.c, construct a mutatorcontext object and pass it to arenaaccess. 
Copied from Perforce
 Change: 192550
 ServerID: perforce.ravenbrook.com
 2016-10-13 20:12:32 +01:00
Gareth Rees
6903784501 Fix "make testmmqa" on freebsd (the shell doesn't do {a,b,c} expansion). 
Copied from Perforce
 Change: 192545
 ServerID: perforce.ravenbrook.com
 2016-10-13 19:31:25 +01:00
Gareth Rees
626f880a7e Fix comment: ll = clang/llvm, not gcc. 
Copied from Perforce
 Change: 192540
 ServerID: perforce.ravenbrook.com
 2016-10-13 19:15:27 +01:00
Gareth Rees
fe1f07321b Fix makefile, accidentally broken by change 192512. 
Copied from Perforce
 Change: 192539
 ServerID: perforce.ravenbrook.com
 2016-10-13 19:13:31 +01:00
Gareth Rees
d31012f13a Implement mutatorcontextsp and mutatorcontextscan for platforms w3i3 and w3i6. 
This means that ThreadScan becomes identical on these two platforms and can be moved to thw3.c.
This means that thw3.h, thw3i3.c and thw3i6.c become redundant and can be deleted.

Copied from Perforce
 Change: 192534
 ServerID: perforce.ravenbrook.com
 2016-10-13 16:28:50 +01:00
Gareth Rees
91551170b1 Remove return statements that have no effect. 
Copied from Perforce
 Change: 192529
 ServerID: perforce.ravenbrook.com
 2016-10-13 15:17:50 +01:00
Gareth Rees
5c31ca3cab Rename the "protection mutator context" module to "mutator context" (this module handles mutator context decoding for both the protection module and the thread module). 
Rename functions Prot{Can,}StepInstruction to MutatorContext{Can,}StepInstruction so that they follow the naming convention in guide.implc.naming.prefix.program.
Move mutator context declarations out of prot.h into new header prmc.h.
Correct .assume.null in a couple of places -- it's not safe for MutatorContextStepInstruction to return ResUNIMPL, instead MutatorContextCanStepInstruction should return FALSE.

Copied from Perforce
 Change: 192528
 ServerID: perforce.ravenbrook.com
 2016-10-13 15:06:14 +01:00
Gareth Rees
c35e544d73 Rename mutatorfaultcontext to mutatorcontext because this data structure is not only used to store the context of a fault, but also to store the context of a thread that has been suspended. 
Copied from Perforce
 Change: 192523
 ServerID: perforce.ravenbrook.com
 2016-10-13 14:23:39 +01:00
Gareth Rees
5a580660f6 Remove undocumented global mps_exception_info. now that the mps is open source, there is no difficulty in debugging the mutator context. 
Copied from Perforce
 Change: 192518
 ServerID: perforce.ravenbrook.com
 2016-10-13 13:45:31 +01:00
Gareth Rees
8b002dc4d5 Fix testmmqa target in the hot variety. 
Copied from Perforce
 Change: 192515
 ServerID: perforce.ravenbrook.com
 2016-10-13 13:31:58 +01:00