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  66. 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> &nbsp; [<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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  68. <hr>

  69. <a name="JIT-Declarations"></a>

  70. <h3 class="section">29.1 JIT Declarations</h3>

  71. 

  72. <p>These are the relevant struct declarations that a C program should include to

  73. implement the interface:

  74. </p>

  75. <div class="smallexample">

  76. <pre class="smallexample">typedef enum

  77. {

  78.   JIT_NOACTION = 0,

  79.   JIT_REGISTER_FN,

  80.   JIT_UNREGISTER_FN

  81. } jit_actions_t;

  82. 

  83. struct jit_code_entry

  84. {

  85.   struct jit_code_entry *next_entry;

  86.   struct jit_code_entry *prev_entry;

  87.   const char *symfile_addr;

  88.   uint64_t symfile_size;

  89. };

  90. 

  91. struct jit_descriptor

  92. {

  93.   uint32_t version;

  94.   /* This type should be jit_actions_t, but we use uint32_t

  95.      to be explicit about the bitwidth.  */

  96.   uint32_t action_flag;

  97.   struct jit_code_entry *relevant_entry;

  98.   struct jit_code_entry *first_entry;

  99. };

  100. 

  101. /* GDB puts a breakpoint in this function.  */

  102. void __attribute__((noinline)) __jit_debug_register_code() { };

  103. 

  104. /* Make sure to specify the version statically, because the

  105.    debugger may check the version before we can set it.  */

  106. struct jit_descriptor __jit_debug_descriptor = { 1, 0, 0, 0 };

  107. </pre></div>

  108. 

  109. <p>If the JIT is multi-threaded, then it is important that the JIT synchronize any

  110. modifications to this global data properly, which can easily be done by putting

  111. a global mutex around modifications to these structures.

  112. </p>

  113. 

  114. 

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