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| <a name="Declarations"></a> |
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| Next: <a href="Registering-Code.html#Registering-Code" accesskey="n" rel="next">Registering Code</a>, Up: <a href="JIT-Interface.html#JIT-Interface" accesskey="u" rel="up">JIT Interface</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> |
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| <a name="JIT-Declarations"></a> |
| <h3 class="section">29.1 JIT Declarations</h3> |
| |
| <p>These are the relevant struct declarations that a C program should include to |
| implement the interface: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">typedef enum |
| { |
| JIT_NOACTION = 0, |
| JIT_REGISTER_FN, |
| JIT_UNREGISTER_FN |
| } jit_actions_t; |
| |
| struct jit_code_entry |
| { |
| struct jit_code_entry *next_entry; |
| struct jit_code_entry *prev_entry; |
| const char *symfile_addr; |
| uint64_t symfile_size; |
| }; |
| |
| struct jit_descriptor |
| { |
| uint32_t version; |
| /* This type should be jit_actions_t, but we use uint32_t |
| to be explicit about the bitwidth. */ |
| uint32_t action_flag; |
| struct jit_code_entry *relevant_entry; |
| struct jit_code_entry *first_entry; |
| }; |
| |
| /* GDB puts a breakpoint in this function. */ |
| void __attribute__((noinline)) __jit_debug_register_code() { }; |
| |
| /* Make sure to specify the version statically, because the |
| debugger may check the version before we can set it. */ |
| struct jit_descriptor __jit_debug_descriptor = { 1, 0, 0, 0 }; |
| </pre></div> |
| |
| <p>If the JIT is multi-threaded, then it is important that the JIT synchronize any |
| modifications to this global data properly, which can easily be done by putting |
| a global mutex around modifications to these structures. |
| </p> |
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