90 lines
3.3 KiB
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90 lines
3.3 KiB
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<title>Declarations - Debugging with GDB</title>
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<meta name="description" content="Debugging with GDB">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="JIT-Interface.html#JIT-Interface" title="JIT Interface">
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<link rel="next" href="Registering-Code.html#Registering-Code" title="Registering Code">
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,''
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<div class="node">
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<a name="Declarations"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Registering-Code.html#Registering-Code">Registering Code</a>,
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Up: <a rel="up" accesskey="u" href="JIT-Interface.html#JIT-Interface">JIT Interface</a>
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<hr>
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</div>
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<h3 class="section">29.1 JIT Declarations</h3>
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<p>These are the relevant struct declarations that a C program should include to
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implement the interface:
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<pre class="smallexample"> typedef enum
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{
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JIT_NOACTION = 0,
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JIT_REGISTER_FN,
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JIT_UNREGISTER_FN
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} jit_actions_t;
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struct jit_code_entry
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{
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struct jit_code_entry *next_entry;
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struct jit_code_entry *prev_entry;
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const char *symfile_addr;
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uint64_t symfile_size;
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};
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struct jit_descriptor
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{
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uint32_t version;
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/* This type should be jit_actions_t, but we use uint32_t
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to be explicit about the bitwidth. */
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uint32_t action_flag;
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struct jit_code_entry *relevant_entry;
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struct jit_code_entry *first_entry;
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};
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/* GDB puts a breakpoint in this function. */
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void __attribute__((noinline)) __jit_debug_register_code() { };
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/* Make sure to specify the version statically, because the
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debugger may check the version before we can set it. */
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struct jit_descriptor __jit_debug_descriptor = { 1, 0, 0, 0 };
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</pre>
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<p>If the JIT is multi-threaded, then it is important that the JIT synchronize any
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modifications to this global data properly, which can easily be done by putting
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a global mutex around modifications to these structures.
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</body></html>
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