Usage of ptr causes illegal instruction

[Ryan Gonzalez]

Note: I'm posting this here instead of the issue tracker because I'm not sure whether or not this is a bug.

Here is the simplest code I can get that causes the error:

#include <asmjit/asmjit.h>

#include <iostream>

using namespace asmjit;

using namespace asmjit::host;

int main()

{

    int n;

    JitRuntime r;

    FileLogger logger{stdout};

    X86Compiler c{&r};

    c.setLogger(&logger);

    c.addFunc(kFuncConvHost, FuncBuilder1<void, void*>());

    X86GpVar p{c, kVarTypeIntPtr, "p"};

    c.setArg(0, p);

    c.mov(ptr(p), 1);

    c.endFunc();

    asmjit_cast<void(*)(int*)>(c.make())(&n);

    std::cout << n << std::endl;

    return 0;

}

Output:

L0:

*** ERROR: Illegal instruction (9).

mov [rdi], 1                        ; mov [p], 1 R

L1:

ret                                 ;             

Segmentation fault (core dumped)

What am I doing wrong?

--

Ryan

If anybody ever asks me why I prefer C++ to C, my answer will be simple: "It's becauseslejfp23(@#Q*(E*EIdc-SEGFAULT. Wait, I don't think that was nul-terminated."

Personal reality distortion fields are immune to contradictory evidence. - srean

Check out my website: http://kirbyfan64.github.io/

[Petr Kobalíček]

Hi Ryan

In case that there is no register used the memory pointer size can't be determined automatically.

Use c.mov(dword_ptr(p), 1);

I should probably add a new error for this as it happens often.

Cheers,
Petr

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[Ryan Gonzalez]

Thank you! That is probably a common error that has already bitten my twice.