[llvm-dev] OrcLazyJIT for windows
David via llvm-dev
llvm-dev at lists.llvm.org
Wed May 4 11:17:26 PDT 2016
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;
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