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118 lines
4.3 KiB
HTML
118 lines
4.3 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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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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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Declarations (Debugging with GDB)</title>
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<meta name="description" content="Declarations (Debugging with GDB)">
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<meta name="keywords" content="Declarations (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="JIT-Interface.html#JIT-Interface" rel="up" title="JIT Interface">
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<link href="Registering-Code.html#Registering-Code" rel="next" title="Registering Code">
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<link href="JIT-Interface.html#JIT-Interface" rel="prev" title="JIT Interface">
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Declarations"></a>
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<div class="header">
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<p>
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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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</div>
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<hr>
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<a name="JIT-Declarations"></a>
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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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</p>
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<div class="smallexample">
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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></div>
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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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</p>
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</body>
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</html>
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