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Re: [Libjit] Global variables

From: Aleksey Demakov
Subject: Re: [Libjit] Global variables
Date: Fri, 10 Jun 2016 14:55:36 +0600

Hi Michael,

On Wed, Jun 8, 2016 at 1:35 PM, Michael Rolnik <address@hidden> wrote:
> Is there a way to create a global variables and access them from a function?
> How?

Probably it's more complicated than it should be.  The memory
for a global variable should be allocated separately. E.g. have it
defined as a C-variable in a program that uses libjit.

static int32_t g_var;

Have a type for the address of this variable.

jit_type_t type_int32_ptr = jit_type_create_pointer(jit_type_int, 0);

In every jit function that is to use this variable define a jit value for
its address.

jit_value_t g_var_addr = jit_value_create_nint_constant(
  a_func, type_int32_ptr,  (jit_nint) &g_var);

And use jit_insn_load_relative() and jit_insn_store_relative() with
this address and zero offset.


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