[llvm-dev] OrcLazyJIT for windows
Lang Hames via llvm-dev
llvm-dev at lists.llvm.org
Wed May 4 14:39:58 PDT 2016
Hi David,
This is really cool. I'd love to get this in-tree.
There are two ways we could go about this:
(1) Make the OrcArchitecture interface ABI-aware so that it can choose the
right resolver code,
or
(2) Replace the OrcArchitecture classes with OrcABI classes. I.e. We'd just
a rename OrcX86_64 -> Orc_X86_64_SysV (and rename I386 & AArch64 similarly)
, then we add your code as Orc_X86_64_Windows.
I think the second is probably the way to go, with a little refactoring so
that the various X86 ABIs could share the stub and resolver code.
Any interest in submitting a patch?
- Lang.
On Wed, May 4, 2016 at 11:21 AM, David Blaikie <dblaikie at gmail.com> wrote:
> +Lang, JIT Cowboy
>
> On Wed, May 4, 2016 at 11:17 AM, David via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Hi There,
>>
>> I am currently exploring C++ JIT-compilation for a project where this
>> would be very useful. I started with the code from the lli tool which uses
>> OrcLazyJIT and changed it, such that the module is being compiled from c++
>> source in memory and OrcLazyJIT is used exclusively.
>>
>> Now since I am on windows, I found that my application is crashing when
>> trying to run the main function from the jit-compiled module ( which was
>> found by casting the symbol address to the main prototype). Now after some
>> digging I found that the crash is caused by
>> LocalJITCompileCallbackManager::reenter not getting the correct
>> CompileCallback and trampolineid references. This in turn is being caused by
>> OrcX86_64::writeResolverCode not respecting windows calling convention in
>> the asm code for calling the reentry function.
>>
>> After making changes to the asm code in OrcX86_64::writeResolverCode, the
>> code runs without any problems. I thought I share it here with the public
>> so that others who would like to use orclazyjit on windows could benefit.
>> Please let me know if a different channel would be more appropriate.
>>
>> Best,
>> David
>>
>> In order to get OrcLazyJIT to work under windows, replace the prebaked
>> asm code in OrcX86_64::writeResolverCode in file
>> llvm/lib/ExecutionEngine/Orc/OrcAchitectureSupport.cpp with the following.
>> Note that more work is needed to both support linux/windows but I am not
>> sure how this is best dealt with in llvm.
>>
>>
>> // windows (arguments go to rcx and rdx and have reversed order)---
>>
>> const uint8_t ResolverCode[] = {
>>
>> // resolver_entry:
>>
>> 0x55, // 0x00: pushq %rbp
>>
>> 0x48, 0x89, 0xe5, // 0x01: movq %rsp, %rbp
>>
>> 0x50, // 0x04: pushq %rax
>>
>> 0x53, // 0x05: pushq %rbx
>>
>> 0x51, // 0x06: pushq %rcx
>>
>> 0x52, // 0x07: pushq %rdx
>>
>> 0x56, // 0x08: pushq %rsi
>>
>> 0x57, // 0x09: pushq %rdi
>>
>> 0x41, 0x50, // 0x0a: pushq %r8
>>
>> 0x41, 0x51, // 0x0c: pushq %r9
>>
>> 0x41, 0x52, // 0x0e: pushq %r10
>>
>> 0x41, 0x53, // 0x10: pushq %r11
>>
>> 0x41, 0x54, // 0x12: pushq %r12
>>
>> 0x41, 0x55, // 0x14: pushq %r13
>>
>> 0x41, 0x56, // 0x16: pushq %r14
>>
>> 0x41, 0x57, // 0x18: pushq %r15
>>
>> 0x48, 0x81, 0xec, 0x08, 0x02, 0x00, 0x00, // 0x1a: subq 0x208, %rsp
>>
>> 0x48, 0x0f, 0xae, 0x04, 0x24, // 0x21: fxsave64 (%rsp)
>>
>>
>>
>> 0x48, 0xb9, // 0x26: movabsq <CBMgr>, %rcx
>>
>> // 0x28: Callback manager addr.
>>
>> 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>>
>>
>>
>> 0x48, 0x8B, 0x55, 0x08, // mov rdx,QWORD PTR [rbp+0x8]
>>
>> 0x48, 0x83, 0xea, 0x06, // sub rdx,0x6
>>
>>
>>
>> 0x48, 0xb8, // 0x38: movabsq <REntry>, %rax
>>
>> // 0x3a: JIT re-entry fn addr:
>>
>> 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>>
>>
>> 0xff, 0xd0, // 0x42: callq *%rax
>>
>> 0x48, 0x89, 0x45, 0x08, // 0x44: movq %rax, 8(%rbp)
>>
>> 0x48, 0x0f, 0xae, 0x0c, 0x24, // 0x48: fxrstor64 (%rsp)
>>
>> 0x48, 0x81, 0xc4, 0x08, 0x02, 0x00, 0x00, // 0x4d: addq 0x208, %rsp
>>
>> 0x41, 0x5f, // 0x54: popq %r15
>>
>> 0x41, 0x5e, // 0x56: popq %r14
>>
>> 0x41, 0x5d, // 0x58: popq %r13
>>
>> 0x41, 0x5c, // 0x5a: popq %r12
>>
>> 0x41, 0x5b, // 0x5c: popq %r11
>>
>> 0x41, 0x5a, // 0x5e: popq %r10
>>
>> 0x41, 0x59, // 0x60: popq %r9
>>
>> 0x41, 0x58, // 0x62: popq %r8
>>
>> 0x5f, // 0x64: popq %rdi
>>
>> 0x5e, // 0x65: popq %rsi
>>
>> 0x5a, // 0x66: popq %rdx
>>
>> 0x59, // 0x67: popq %rcx
>>
>> 0x5b, // 0x68: popq %rbx
>>
>> 0x58, // 0x69: popq %rax
>>
>> 0x5d, // 0x6a: popq %rbp
>>
>> 0xc3, // 0x6b: retq
>>
>> };
>>
>>
>> const unsigned ReentryFnAddrOffset = 0x3a;
>>
>> const unsigned CallbackMgrAddrOffset = 0x28;
>>
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>>
>
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