small-c / obj.h Goto Github PK

I'm testing win32_app with Pelles C. It failed to compile with a bunch of errors I don't understand. Perhaps you should download Pelles C and playing a bit with it.

Is it possible @nomi-san? Or obj.h can only used on plain C?

https://www.embarcadero.com/free-tools/ccompiler

https://www.embarcadero.com/products/cbuilder/starter

Let a method template like this:

void foo() {
    volatile size_t self = 0xFFFFFFFFFFFFDEAD;
    printf("self: %p\n", (void *)self);
}

// mov	x0, #0xDEAD
// movk	x0, #0xFFFF, lsl #16
// movk	x0, #0xFFFF, lsl #32
// movk	x0, #0xFFFF, lsl #48
// str  x0, [sp, #24] 

Finding offset:

for (offset = 0; offset < LIMIT; offset++)
  if ((ip[offset] >> 24) == 0xD2)       // MOV
    if (ip[offset + 1] >> 24) == 0xF2)  // MOVK
      if (((ip[offset] >> 5) & 0xFFFF) == 0xDEAD)
        // found

Patching self data:

mov   ?, [data & 0xFF]
movk  ?, [data >> 16], lsl #16
movk  ?, [data >> 32], lsl #32
movk  ?, [data >> 48], lsl #48
; str   ?, [sp, ?] 

Trampoline:

; addr = proto + offset + 2 * sizeof(uint32_t)   // 32bit fixed length instruction
mov   x9, [addr & 0xFF]
movk  x9, [addr >> 16], lsl #16
movk  x9, [addr >> 32], lsl #32
movk  x9, [addr >> 48], lsl #48
br    x9

Result:

foo2 = bind(foo, 0xdeadbeef);
foo2();
// self: deadbeef

I want to use it in emscripten

Pelles C is Windows only. Able to generate both 32 bit and 64 bit binaries. Why Pelles C? Pelles C is small and lightweight. MSVC and mingw64 are beasts, eating gigabytes of precious disk space. Oh almost forgot, this is Pelles C: http://www.smorgasbordet.com/pellesc/

1. how can I inherit a method without overriding it so that the parent part of the code and the child part are executed?
2. how to call super method on child object without overriding?

in the examples, either creating one class, or more than two but with overriding parent methods ...........

your header is very easy to use with examples, but the problems encountered baffle me

hope for help

As the title says, when I compile the foo.c with gcc foo.c, there is no problem. But when I run the program, I got below output:

Clofn: could't change memory type of C.malloc allocated!
Clofn: could't change memory type of C.malloc allocated!
Segmentation fault (core dumped)

My OS:

$ uname -a
Linux localhost.localdomain 3.10.0-957.el7.x86_64 #1 SMP Thu Oct 4 20:48:51 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

I check the error message from the source, the problem comes from __wobj_ativ_mem function.