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  18. <title>JIT Interface (Debugging with GDB)</title>

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  69. <a name="JIT-Compilation-Interface"></a>

  70. <h2 class="chapter">29 JIT Compilation Interface</h2>

  71. <a name="index-just_002din_002dtime-compilation"></a>

  72. <a name="index-JIT-compilation-interface"></a>

  73. 

  74. <p>This chapter documents <small>GDB</small>&rsquo;s <em>just-in-time</em> (JIT) compilation

  75. interface.  A JIT compiler is a program or library that generates native

  76. executable code at runtime and executes it, usually in order to achieve good

  77. performance while maintaining platform independence. 

  78. </p>

  79. <p>Programs that use JIT compilation are normally difficult to debug because

  80. portions of their code are generated at runtime, instead of being loaded from

  81. object files, which is where <small>GDB</small> normally finds the program&rsquo;s symbols

  82. and debug information.  In order to debug programs that use JIT compilation,

  83. <small>GDB</small> has an interface that allows the program to register in-memory

  84. symbol files with <small>GDB</small> at runtime.

  85. </p>

  86. <p>If you are using <small>GDB</small> to debug a program that uses this interface, then

  87. it should work transparently so long as you have not stripped the binary.  If

  88. you are developing a JIT compiler, then the interface is documented in the rest

  89. of this chapter.  At this time, the only known client of this interface is the

  90. LLVM JIT.

  91. </p>

  92. <p>Broadly speaking, the JIT interface mirrors the dynamic loader interface.  The

  93. JIT compiler communicates with <small>GDB</small> by writing data into a global

  94. variable and calling a function at a well-known symbol.  When <small>GDB</small>

  95. attaches, it reads a linked list of symbol files from the global variable to

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