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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>Methods (STABS)</title>

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  25. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  26. <link href="Cplusplus.html#Cplusplus" rel="up" title="Cplusplus">

  27. <link href="Method-Type-Descriptor.html#Method-Type-Descriptor" rel="next" title="Method Type Descriptor">

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  60. <body lang="en">

  61. <a name="Methods"></a>

  62. <div class="header">

  63. <p>

  64. Next: <a href="Method-Type-Descriptor.html#Method-Type-Descriptor" accesskey="n" rel="next">Method Type Descriptor</a>, Previous: <a href="Class-Instance.html#Class-Instance" accesskey="p" rel="prev">Class Instance</a>, Up: <a href="Cplusplus.html#Cplusplus" accesskey="u" rel="up">Cplusplus</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="Method-Definition"></a>

  68. <h3 class="section">8.6 Method Definition</h3>

  69. 

  70. <p>The class definition shown above declares Ameth.  The C<tt>++</tt> source below

  71. defines Ameth:

  72. </p>

  73. <div class="example">

  74. <pre class="example">int

  75. baseA::Ameth(int in, char other)

  76. {

  77.         return in;

  78. };

  79. </pre></div>

  80. 

  81. 

  82. <p>This method definition yields three stabs following the code of the

  83. method.  One stab describes the method itself and following two describe

  84. its parameters.  Although there is only one formal argument all methods

  85. have an implicit argument which is the <code>this</code> pointer.  The <code>this</code>

  86. pointer is a pointer to the object on which the method was called.  Note

  87. that the method name is mangled to encode the class name and argument

  88. types.  Name mangling is described in the <small>ARM</small> (<cite>The Annotated

  89. C++ Reference Manual</cite>, by Ellis and Stroustrup, <small>ISBN</small>

  90. 0-201-51459-1); <samp>gpcompare.texi</samp> in Cygnus GCC distributions

  91. describes the differences between GNU mangling and <small>ARM</small>

  92. mangling.

  93. </p>

  94. <div class="example">

  95. <pre class="example">.stabs &quot;name:symbol_descriptor(global function)return_type(int)&quot;,

  96.         N_FUN, NIL, NIL, code_addr_of_method_start

  97. 

  98. .stabs &quot;Ameth__5baseAic:F1&quot;,36,0,0,_Ameth__5baseAic

  99. </pre></div>

  100. 

  101. <p>Here is the stab for the <code>this</code> pointer implicit argument.  The

  102. name of the <code>this</code> pointer is always <code>this</code>.  Type 19, the

  103. <code>this</code> pointer is defined as a pointer to type 20, <code>baseA</code>,

  104. but a stab defining <code>baseA</code> has not yet been emitted.  Since the

  105. compiler knows it will be emitted shortly, here it just outputs a cross

  106. reference to the undefined symbol, by prefixing the symbol name with

  107. &lsquo;<samp>xs</samp>&rsquo;.

  108. </p>

  109. <div class="example">

  110. <pre class="example">.stabs &quot;name:sym_desc(register param)type_def(19)=

  111.         type_desc(ptr to)type_ref(baseA)=

  112.         type_desc(cross-reference to)baseA:&quot;,N_RSYM,NIL,NIL,register_number

  113. 

  114. .stabs &quot;this:P19=*20=xsbaseA:&quot;,64,0,0,8

  115. </pre></div>

  116. 

  117. <p>The stab for the explicit integer argument looks just like a parameter

  118. to a C function.  The last field of the stab is the offset from the

  119. argument pointer, which in most systems is the same as the frame

  120. pointer.

  121. </p>

  122. <div class="example">

  123. <pre class="example">.stabs &quot;name:sym_desc(value parameter)type_ref(int)&quot;,

  124.         N_PSYM,NIL,NIL,offset_from_arg_ptr

  125. 

  126. .stabs &quot;in:p1&quot;,160,0,0,72

  127. </pre></div>

  128. 

  129. <p>&lt;&lt; The examples that follow are based on A1.C &gt;&gt;

  130. </p>

  131. <hr>

  132. <div class="header">

  133. <p>

  134. Next: <a href="Method-Type-Descriptor.html#Method-Type-Descriptor" accesskey="n" rel="next">Method Type Descriptor</a>, Previous: <a href="Class-Instance.html#Class-Instance" accesskey="p" rel="prev">Class Instance</a>, Up: <a href="Cplusplus.html#Cplusplus" accesskey="u" rel="up">Cplusplus</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>

  135. </div>

  136. 

  137. 

  138. 

  139. </body>

  140. </html>