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<h1 class="settitle" align="center">SBCL Internals</h1>





<a name="SEC_Contents"></a>
<h2 class="contents-heading">Table of Contents</h2>

<div class="contents">

<ul class="no-bullet">
  <li><a name="toc-Build-1" href="Build.html#Build">1 Build</a>
  <ul class="no-bullet">
    <li><a name="toc-Cold-init-1" href="Cold-init.html#Cold-init">1.1 Cold init</a></li>
  </ul></li>
  <li><a name="toc-Calling-Convention-1" href="Calling-Convention.html#Calling-Convention">2 Calling Convention</a>
  <ul class="no-bullet">
    <li><a name="toc-Assembly-Routines-1" href="Assembly-Routines.html#Assembly-Routines">2.1 Assembly Routines</a></li>
    <li><a name="toc-Local-Calls-1" href="Local-Calls.html#Local-Calls">2.2 Local Calls</a></li>
    <li><a name="toc-Full-Calls-1" href="Full-Calls.html#Full-Calls">2.3 Full Calls</a></li>
    <li><a name="toc-Unknown_002dValues-Returns-1" href="Unknown_002dValues-Returns.html#Unknown_002dValues-Returns">2.4 Unknown-Values Returns</a></li>
    <li><a name="toc-IR2-Conversion-1" href="IR2-Conversion.html#IR2-Conversion">2.5 IR2 Conversion</a></li>
    <li><a name="toc-Additional-Notes-1" href="Additional-Notes.html#Additional-Notes">2.6 Additional Notes</a></li>
  </ul></li>
  <li><a name="toc-Discriminating-Functions-1" href="Discriminating-Functions.html#Discriminating-Functions">3 Discriminating Functions</a>
  <ul class="no-bullet">
    <li><a name="toc-The-Initial-Discriminating-Function-1" href="The-Initial-Discriminating-Function.html#The-Initial-Discriminating-Function">3.1 The Initial Discriminating Function</a></li>
    <li><a name="toc-Method_002dBased-Discriminating-Functions-1" href="Method_002dBased-Discriminating-Functions.html#Method_002dBased-Discriminating-Functions">3.2 Method-Based Discriminating Functions</a></li>
    <li><a name="toc-Accessor-Discriminating-Functions-1" href="Accessor-Discriminating-Functions.html#Accessor-Discriminating-Functions">3.3 Accessor Discriminating Functions</a></li>
    <li><a name="toc-Cacheing-and-Dispatch-Functions-1" href="Cacheing-and-Dispatch-Functions.html#Cacheing-and-Dispatch-Functions">3.4 Cacheing and Dispatch Functions</a></li>
    <li><a name="toc-The-Cacheing-Mechanism-1" href="The-Cacheing-Mechanism.html#The-Cacheing-Mechanism">3.5 The Cacheing Mechanism</a></li>
  </ul></li>
  <li><a name="toc-Foreign-Linkage-1" href="Foreign-Linkage.html#Foreign-Linkage">4 Foreign Linkage</a>
  <ul class="no-bullet">
    <li><a name="toc-Linkage_002dtable-1" href="Linkage_002dtable.html#Linkage_002dtable">4.1 Linkage-table</a>
    <ul class="no-bullet">
      <li><a name="toc-Differences-to-CMUCL" href="Linkage_002dtable.html#Differences-to-CMUCL">4.1.1 Differences to CMUCL</a></li>
      <li><a name="toc-Nitty-Gritty-Details" href="Linkage_002dtable.html#Nitty-Gritty-Details">4.1.2 Nitty Gritty Details</a></li>
      <li><a name="toc-Porting" href="Linkage_002dtable.html#Porting">4.1.3 Porting</a>
      <ul class="no-bullet">
        <li><a name="toc-Porting-to-new-operating-systems" href="Linkage_002dtable.html#Porting-to-new-operating-systems">4.1.3.1 Porting to new operating systems</a></li>
        <li><a name="toc-Porting-to-new-architectures" href="Linkage_002dtable.html#Porting-to-new-architectures">4.1.3.2 Porting to new architectures</a></li>
      </ul></li>
    </ul></li>
    <li><a name="toc-Lazy-Alien-Resolution-1" href="Lazy-Alien-Resolution.html#Lazy-Alien-Resolution">4.2 Lazy Alien Resolution</a></li>
    <li><a name="toc-Callbacks-1" href="Callbacks.html#Callbacks">4.3 Callbacks</a></li>
  </ul></li>
  <li><a name="toc-Funcallable-Instances-1" href="Funcallable-Instances.html#Funcallable-Instances">5 Funcallable Instances</a>
  <ul class="no-bullet">
    <li><a name="toc-Overview-of-Funcallable-Instances-1" href="Overview-of-Funcallable-Instances.html#Overview-of-Funcallable-Instances">5.1 Overview of Funcallable Instances</a></li>
    <li><a name="toc-Implementation-of-Funcallable-Instances-1" href="Implementation-of-Funcallable-Instances.html#Implementation-of-Funcallable-Instances">5.2 Implementation of Funcallable Instances</a></li>
  </ul></li>
  <li><a name="toc-Objects-In-Memory-1" href="Objects-In-Memory.html#Objects-In-Memory">6 Objects In Memory</a>
  <ul class="no-bullet">
    <li><a name="toc-Type-tags-1" href="Type-tags.html#Type-tags">6.1 Type tags</a>
    <ul class="no-bullet">
      <li><a name="toc-Lowtags" href="Type-tags.html#Lowtags">6.1.1 Lowtags</a>
      <ul class="no-bullet">
        <li><a name="toc-Fixnums" href="Type-tags.html#Fixnums">6.1.1.1 Fixnums</a></li>
        <li><a name="toc-Other_002dimmediates" href="Type-tags.html#Other_002dimmediates">6.1.1.2 Other-immediates</a></li>
        <li><a name="toc-Pointers" href="Type-tags.html#Pointers">6.1.1.3 Pointers</a></li>
      </ul></li>
      <li><a name="toc-Widetags" href="Type-tags.html#Widetags">6.1.2 Widetags</a></li>
    </ul></li>
    <li><a name="toc-Heap-Object-Layout-1" href="Heap-Object-Layout.html#Heap-Object-Layout">6.2 Heap Object Layout</a>
    <ul class="no-bullet">
      <li><a name="toc-Header-Values" href="Heap-Object-Layout.html#Header-Values">6.2.1 Header Values</a></li>
      <li><a name="toc-Symbols" href="Heap-Object-Layout.html#Symbols">6.2.2 Symbols</a></li>
      <li><a name="toc-The-NIL_002dcons-Hack" href="Heap-Object-Layout.html#The-NIL_002dcons-Hack">6.2.3 The NIL-cons Hack</a></li>
      <li><a name="toc-Functions-and-Code-Components" href="Heap-Object-Layout.html#Functions-and-Code-Components">6.2.4 Functions and Code Components</a></li>
    </ul></li>
  </ul></li>
  <li><a name="toc-Signal-handling-1" href="Signal-handling.html#Signal-handling">7 Signal handling</a>
  <ul class="no-bullet">
    <li><a name="toc-Groups-of-signals-1" href="Groups-of-signals.html#Groups-of-signals">7.1 Groups of signals</a>
    <ul class="no-bullet">
      <li><a name="toc-Synchronous-signals" href="Groups-of-signals.html#Synchronous-signals">7.1.1 Synchronous signals</a></li>
      <li><a name="toc-Asynchronous-or-blockable-signals" href="Groups-of-signals.html#Asynchronous-or-blockable-signals">7.1.2 Asynchronous or blockable signals</a></li>
    </ul></li>
    <li><a name="toc-The-deferral-mechanism-1" href="The-deferral-mechanism.html#The-deferral-mechanism">7.2 The deferral mechanism</a>
    <ul class="no-bullet">
      <li><a name="toc-Pseudo-atomic-sections" href="The-deferral-mechanism.html#Pseudo-atomic-sections">7.2.1 Pseudo atomic sections</a></li>
      <li><a name="toc-WITHOUT_002dINTERRUPTS" href="The-deferral-mechanism.html#WITHOUT_002dINTERRUPTS">7.2.2 <code>WITHOUT-INTERRUPTS</code></a></li>
      <li><a name="toc-Stop-the-world" href="The-deferral-mechanism.html#Stop-the-world">7.2.3 Stop the world</a></li>
      <li><a name="toc-When-are-signals-handled_003f" href="The-deferral-mechanism.html#When-are-signals-handled_003f">7.2.4 When are signals handled?</a></li>
    </ul></li>
    <li><a name="toc-Implementation-warts-1" href="Implementation-warts.html#Implementation-warts">7.3 Implementation warts</a>
    <ul class="no-bullet">
      <li><a name="toc-Miscellaneous-issues" href="Implementation-warts.html#Miscellaneous-issues">7.3.1 Miscellaneous issues</a></li>
      <li><a name="toc-POSIX-_002d_002d-Letter-and-Spirit" href="Implementation-warts.html#POSIX-_002d_002d-Letter-and-Spirit">7.3.2 POSIX &ndash; Letter and Spirit</a></li>
    </ul></li>
    <li><a name="toc-Programming-with-signal-handling-in-mind-1" href="Programming-with-signal-handling-in-mind.html#Programming-with-signal-handling-in-mind">7.4 Programming with signal handling in mind</a>
    <ul class="no-bullet">
      <li><a name="toc-On-reentrancy" href="Programming-with-signal-handling-in-mind.html#On-reentrancy">7.4.1 On reentrancy</a></li>
      <li><a name="toc-More-deadlocks" href="Programming-with-signal-handling-in-mind.html#More-deadlocks">7.4.2 More deadlocks</a></li>
      <li><a name="toc-Calling-user-code" href="Programming-with-signal-handling-in-mind.html#Calling-user-code">7.4.3 Calling user code</a></li>
    </ul></li>
    <li><a name="toc-Debugging" href="Programming-with-signal-handling-in-mind.html#Debugging">7.5 Debugging</a></li>
  </ul></li>
  <li><a name="toc-Slot_002dValue-1" href="Slot_002dValue.html#Slot_002dValue">8 Slot-Value</a>
  <ul class="no-bullet">
    <li><a name="toc-Basic-Implementation-1" href="Basic-Implementation.html#Basic-Implementation">8.1 Basic Implementation</a></li>
    <li><a name="toc-Compiler-Transformations-1" href="Compiler-Transformations.html#Compiler-Transformations">8.2 Compiler Transformations</a>
    <ul class="no-bullet">
      <li><a name="toc-Within-Methods" href="Compiler-Transformations.html#Within-Methods">8.2.1 Within Methods</a></li>
      <li><a name="toc-Outside-of-Methods" href="Compiler-Transformations.html#Outside-of-Methods">8.2.2 Outside of Methods</a></li>
    </ul></li>
    <li><a name="toc-MOP-Optimizations-1" href="MOP-Optimizations.html#MOP-Optimizations">8.3 MOP Optimizations</a></li>
  </ul></li>
  <li><a name="toc-Specials-1" href="Specials.html#Specials">9 Specials</a>
  <ul class="no-bullet">
    <li><a name="toc-Overview-1" href="Overview.html#Overview">9.1 Overview</a></li>
    <li><a name="toc-Binding-and-unbinding-1" href="Binding-and-unbinding.html#Binding-and-unbinding">9.2 Binding and unbinding</a></li>
  </ul></li>
  <li><a name="toc-Character-and-String-Types-1" href="Character-and-String-Types.html#Character-and-String-Types">10 Character and String Types</a>
  <ul class="no-bullet">
    <li><a name="toc-Memory-Layout-1" href="Memory-Layout.html#Memory-Layout">10.1 Memory Layout</a></li>
    <li><a name="toc-Reader-and-Printer-1" href="Reader-and-Printer.html#Reader-and-Printer">10.2 Reader and Printer</a></li>
  </ul></li>
  <li><a name="toc-Threads-1" href="Threads.html#Threads">11 Threads</a>
  <ul class="no-bullet">
    <li><a name="toc-Implementation-_0028Linux-x86_002fx86_002d64_0029" href="Implementation-_0028Linux-x86_0029.html#Implementation-_0028Linux-x86_0029">11.1 Implementation (Linux x86/x86-64)</a></li>
  </ul></li>
</ul>
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<h1 class="top">SBCL Internals</h1>

<blockquote>
<p>This manual is part of the SBCL software system. See the
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</p>
<p>This manual is in the public domain and is provided with absolutely no
warranty. See the <samp>COPYING</samp> and <samp>CREDITS</samp> files for more
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