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toolchain-gcc-arm-embedded/share/doc/gcc-arm-none-eabi/html/stabs/Common-Blocks.html

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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

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  16. <title>Common Blocks (STABS)</title>

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  61. <a name="Common-Blocks"></a>

  62. <div class="header">

  63. <p>

  64. Next: <a href="Statics.html#Statics" accesskey="n" rel="next">Statics</a>, Previous: <a href="Register-Variables.html#Register-Variables" accesskey="p" rel="prev">Register Variables</a>, Up: <a href="Variables.html#Variables" accesskey="u" rel="up">Variables</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Types-Index.html#Symbol-Types-Index" title="Index" rel="index">Index</a>]</p>

  65. </div>

  66. <hr>

  67. <a name="Common-Blocks-1"></a>

  68. <h3 class="section">4.4 Common Blocks</h3>

  69. 

  70. <p>A common block is a statically allocated section of memory which can be

  71. referred to by several source files.  It may contain several variables.

  72. I believe Fortran is the only language with this feature.

  73. </p>

  74. <a name="index-N_005fBCOMM"></a>

  75. <a name="index-N_005fECOMM"></a>

  76. <a name="index-C_005fBCOMM"></a>

  77. <a name="index-C_005fECOMM"></a>

  78. <p>A <code>N_BCOMM</code> stab begins a common block and an <code>N_ECOMM</code> stab

  79. ends it.  The only field that is significant in these two stabs is the

  80. string, which names a normal (non-debugging) symbol that gives the

  81. address of the common block.  According to IBM documentation, only the

  82. <code>N_BCOMM</code> has the name of the common block (even though their

  83. compiler actually puts it both places).

  84. </p>

  85. <a name="index-N_005fECOML"></a>

  86. <a name="index-C_005fECOML"></a>

  87. <p>The stabs for the members of the common block are between the

  88. <code>N_BCOMM</code> and the <code>N_ECOMM</code>; the value of each stab is the

  89. offset within the common block of that variable.  IBM uses the

  90. <code>C_ECOML</code> stab type, and there is a corresponding <code>N_ECOML</code>

  91. stab type, but Sun&rsquo;s Fortran compiler uses <code>N_GSYM</code> instead.  The

  92. variables within a common block use the &lsquo;<samp>V</samp>&rsquo; symbol descriptor (I

  93. believe this is true of all Fortran variables).  Other stabs (at least

  94. type declarations using <code>C_DECL</code>) can also be between the

  95. <code>N_BCOMM</code> and the <code>N_ECOMM</code>.

  96. </p>

  97. 

  98. 

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