Zoltan, I've rebased from mono's master branch and fixed all merge conflicts, but something that's gone in since I first forked has now broken NaCl AOT compilation for me. On amd64 the compiler just crashes and I'm looking into that, nut on x86 I'm getting this: Can't use AOT image 'mscorlib' in aot-only mode because it is not compiled with --aot=full. But I'm compiling with --aot=full,static,nodebug,ntrampolines=4096
If need be I can pick through the AOT changes that have gone in, but I was hoping you or someone on this list would be able to tell me the major changes to AOT from the past 3 weeks and some ideas about what might be getting in my way. Can you shed any light? -Elijah On Wed, Jan 5, 2011 at 3:51 PM, Zoltan Varga <var...@gmail.com> wrote: > Hi, > > I think the current code looks ok, and we should think about how to merge > it into mono trunk. As a first step, could you rebase your master branch on > top of master to fix the few conflicts which has surfaced due to changes to > mono master ? > > Zoltan > > On Wed, Jan 5, 2011 at 8:23 PM, Elijah Taylor <elijahtay...@google.com>wrote: > >> Hi Zoltan, >> >> I've addressed all of the issues you pointed out (minus genmdesc.c: >> __nacl_suspend_thread_if_needed, but that doesn't need to be merged in at >> this time, it can remain in my local repository only). Please take another >> look at your earliest convenience and let me know if there's anything else >> you need from me. >> >> -Elijah >> >> >> On Tue, Jan 4, 2011 at 10:55 AM, Elijah Taylor >> <elijahtay...@google.com>wrote: >> >>> Replies inline: >>> >>> On Tue, Jan 4, 2011 at 10:30 AM, Zoltan Varga <var...@gmail.com> wrote: >>> >>>> Hi, >>>> >>>> Some comments: >>>> - the patch changes IMT_REG to AMD64_R11 in the non-nacl case, I'm not >>>> sure thats >>>> intentional. >>>> >>> >>> Has this changed in the last six months on the Mono side? IIRC I didn't >>> mean to change anything like this. The reason I made explicit defines was >>> so code in aot-compiler and mini-amd64 could share defines over which reg >>> was the one we jump through and which was a scratch reg. I'll diff vs Mono >>> head revision and make it correct. >>> >>> >>>> - you could define __mono_ilp32__ in the nacl/amd64 case, and use that >>>> instead of >>>> defined(__native_client_codegen__) && defined(TARGET_AMD64) in a few >>>> places. >>>> >>> >>> That sounds reasonable. I'm assuming you mean non-arch specific areas >>> like mini.c, aot-*.c, method-to-ir.c, etc? Are there any other major >>> consequences to defining __mono_ilp32__ ? >>> >>> >>>> - it would be better to define nacl_global_codeman_validate () as a >>>> no-op in the non-nacl case, so its callers wouldn't need #ifdefs. >>>> >>> >>> I'll fix this. >>> >>> >>>> - genmdesc.c contains this change, which is probably not needed: >>>> +void __nacl_suspend_thread_if_needed() {} >>>> + >>>> >>> >>> It is needed temporarily due to a preliminary GC implementation, we don't >>> have to submit it this way. Eventually (soon) we won't need it at all. >>> >>> >>>> - you could use sizeof(mgreg_t) instead of SIZEOF_REGISTER to be >>>> consistent with >>>> the usage of sizeof(gpointer). >>>> >>> >>> Sounds good. I'll try to use sizeof for all compiled code and only use >>> SIZEOF_REGISTER/SIZEOF_VOID_P for pre-processor directives only. >>> >>> >>>> Other than these, I think the changes look fine, they aren't that >>>> disruptive, since they don't >>>> change the non-nacl behavior at all. >>>> >>>> >>> Great! I was worried just based on LOC changed that it might get more >>> resistance. In truth I'm more worried about future Mono changes >>> accidentally breaking NaCl behavior. I'm planning on getting some automated >>> testing implemented soon to combat this though. >>> >>> >>> >>> >>>> On Tue, Dec 21, 2010 at 9:12 PM, Elijah Taylor <elijahtay...@google.com >>>> > wrote: >>>> >>>>> Greetings Mono developers! >>>>> >>>>> >>>>> *[tl;dr very large patch for Native >>>>> Client<http://www.chromium.org/nativeclient> support >>>>> hosted here <https://github.com/elijahtaylor/mono>, would love >>>>> feedback and many eyes to look at it] >>>>> * >>>>> >>>>> >>>>> I'm back with another round of changes for supporting Google's Native >>>>> Client (NaCl), including support for amd64, JIT compilation, and Garbage >>>>> Collection. It's a large set of changes, forked on Dec 14 in github @ >>>>> https://github.com/elijahtaylor/mono. I would appreciate feedback on >>>>> these changes... to facilitate this, I'll try to explain the largest >>>>> changes >>>>> by feature (please email if clarification is needed): >>>>> >>>>> *1) amd64 codegen* >>>>> >>>>> - Rules located here: >>>>> >>>>> http://www.chromium.org/nativeclient/design-documents/nacl-sfi-model-on-x86-64-systems >>>>> - Removed %r15 from register allocation, LMF save/restore, etc. >>>>> (r15 is special and not modifiable by untrusted code) >>>>> - Sandbox all data access through membase address mode. If not >>>>> %rsp or %rbp relative, re-write as clearing upper 32-bits + memindex >>>>> addressing >>>>> - align functions, call sites >>>>> - Sandbox returns and all indirect jumps (need to be 32-byte >>>>> aligned, cleared upper 32-bits) >>>>> - Never omit frame pointer as general operations to rbp aren't >>>>> allowed >>>>> >>>>> *2) NaCl x86-64 is ILP32 (this is the largest set of changes and may >>>>> make some mono devs unhappy)* >>>>> >>>>> - Set SIZEOF_REGISTER == 8 while sizeof(gpointer) == 4 for NaCl >>>>> amd64 (we can use 8-byte instructions, but pointers are 4-bytes) >>>>> - Re-write large portions of mini-amd64.c, tramp-amd64.c, >>>>> exceptions-amd64.c, mini.c, method-to-ir.c to use appropriate sizes >>>>> (SIZEOF_REGISTER, sizeof(gpointer), literal '8'). *These changes >>>>> are disruptive, but ultimately they should be more correct than what >>>>> was >>>>> there before. *It's our opinion that these changes actually >>>>> improve Mono despite their impact. >>>>> - We only generate NaCl amd64 code from an ILP32 machine (either a >>>>> 32-bit application for AOT code, or NaCl runtime JIT), so we may not >>>>> have >>>>> caught all of the [8 <--> SIZEOF_REGISTER] conversions, but we likely >>>>> caught >>>>> most of the [sizeof(gpointer) <--> SIZEOF_REGISTER] and [8 <--> >>>>> sizeof(gpointer)] changes that are necessary. >>>>> - Change atomic operations and default pointer directives to use >>>>> 32-bit instructions (long instead of quad) >>>>> - Change default operations to use 32-bit integers/pointers (eg, >>>>> OP_LOAD_MEMBASE uses 4-bytes instead of 8) >>>>> >>>>> *3) JIT support for NaCl* >>>>> >>>>> - Since we're unable to emit code directly in its final executable >>>>> location, we instead: >>>>> - reserve a buffer on the heap >>>>> - create a hash table entry mapping the temp location and final >>>>> location >>>>> - modify all non-local patches relative to the final location >>>>> - request the NaCl runtime to install the created code in the >>>>> final location >>>>> - See mono/utils/mono-codeman.c changes for more detail. >>>>> - For every codeman *reserve*, we must add a codeman *validate*call in >>>>> order to install the method/trampoline/blob in the final location >>>>> (as well as validate it for NaCl, pad it out, etc) >>>>> - We don't delete or reuse code (we can, but it's icky and the >>>>> benefits don't outweigh the cost) >>>>> - Backpatching changed to use NaCl syscalls to modify existing >>>>> dynamic code >>>>> >>>>> *4) GC support for NaCl (boehm only)* >>>>> >>>>> - NaCl compiler and Mono code generator both emit instrumentation >>>>> at GC "safe points" (back branches and function prologs), for >>>>> cooperative >>>>> thread parking (we're not allowed to send and receive signals) >>>>> - Added new opcode OP_NACL_GC_SAFE_POINT to handle mono >>>>> instrumentation >>>>> - modified pthread_stop_world.c and pthread_support.c somewhat >>>>> extensively to support this new way of stopping the world >>>>> - wrapped pthread_exit because NaCl doesn't support pthread cleanup >>>>> functions >>>>> - added machine type NACL to libgc with machine specific defines >>>>> >>>>> >>>>> *5) Misc bug fixes (not NaCl-specific)* >>>>> >>>>> - fix *x86_memindex_emit* when disp is 32-bit >>>>> - properly exclude code in libgc/gc_dlopen.c when DYNAMIC_LOADING >>>>> not defined >>>>> - properly exclude code based on DISABLE_SOCKETS by including >>>>> config.h before checking define >>>>> - clean up calculation of offset for amd64 AOT specific trampoline >>>>> args >>>>> - fix bug in *mono_bblock_insert_before_ins* when trying to insert >>>>> an instruction to the beginning of an existing basic block. >>>>> - fix small typo bug in genmdesc.pl which kept amd64 from being >>>>> able to be a target of cross compiling >>>>> - fix struct passing in amd64 with sizeof(struct) == 16 when fields >>>>> aren't 8-byte aligned (eg, first field is 12 bytes, second field is 4 >>>>> bytes), pass on stack instead of in registers (mini-amd64.c:* >>>>> add_valuetype*) >>>>> - add extra checks to mini-amd64.c:*mono_arch_emit_exceptions* to >>>>> keep exception/R4/R8 emitting from overflowing a buffer silently >>>>> - fix bugs in *new_codechunk* and >>>>> *mono_code_manager_reserve_align*which allowed unaligned code to be >>>>> allocated. >>>>> >>>>> >>>>> I know we're close to holidays so I don't have any delusions that these >>>>> changes will get in by the end of the year :) Please feel free to pick >>>>> apart these changes and let me know if there are things that should be >>>>> changed. >>>>> >>>>> -Elijah >>>>> >>>>> _______________________________________________ >>>>> Mono-devel-list mailing list >>>>> Mono-devel-list@lists.ximian.com >>>>> http://lists.ximian.com/mailman/listinfo/mono-devel-list >>>>> >>>>> >>>> >>> >> >
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