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Stab-Section-Transformations.html 4.9KB

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  15. <title>Stab Section Transformations (STABS)</title>
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  59. Previous: <a href="Transformations-On-Global-Variables.html#Transformations-On-Global-Variables" accesskey="p" rel="prev">Transformations On Global Variables</a>, Up: <a href="Transformations-On-Symbol-Tables.html#Transformations-On-Symbol-Tables" accesskey="u" rel="up">Transformations On Symbol Tables</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>
  60. </div>
  61. <hr>
  62. <a name="Transformations-of-Stabs-in-separate-sections"></a>
  63. <h4 class="subsection">7.2.3 Transformations of Stabs in separate sections</h4>
  64. <p>For object file formats using stabs in separate sections (see <a href="Stab-Sections.html#Stab-Sections">Stab Sections</a>), use <code>objdump --stabs</code> instead of <code>nm</code> to show the
  65. stabs in an object or executable file. <code>objdump</code> is a GNU utility;
  66. Sun does not provide any equivalent.
  67. </p>
  68. <p>The following example is for a stab whose value is an address is
  69. relative to the compilation unit (see <a href="ELF-Linker-Relocation.html#ELF-Linker-Relocation">ELF Linker Relocation</a>). For
  70. example, if the source line
  71. </p>
  72. <div class="example">
  73. <pre class="example">static int ld = 5;
  74. </pre></div>
  75. <p>appears within a function, then the assembly language output from the
  76. compiler contains:
  77. </p>
  78. <div class="example">
  79. <pre class="example">.Ddata.data:
  80. &hellip;
  81. .stabs &quot;ld:V(0,3)&quot;,0x26,0,4,.L18-Ddata.data # <span class="roman">0x26 is N_STSYM</span>
  82. &hellip;
  83. .L18:
  84. .align 4
  85. .word 0x5
  86. </pre></div>
  87. <p>Because the value is formed by subtracting one symbol from another, the
  88. value is absolute, not relocatable, and so the object file contains
  89. </p>
  90. <div class="example">
  91. <pre class="example">Symnum n_type n_othr n_desc n_value n_strx String
  92. 31 STSYM 0 4 00000004 680 ld:V(0,3)
  93. </pre></div>
  94. <p>without any relocations, and the executable file also contains
  95. </p>
  96. <div class="example">
  97. <pre class="example">Symnum n_type n_othr n_desc n_value n_strx String
  98. 31 STSYM 0 4 00000004 680 ld:V(0,3)
  99. </pre></div>
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