projects / OpenSPARC-T2-SAM / blame
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| 54 | ||
| 55 | <H1><A NAME="SECTION0081300000000000000000"></A><A NAME="global"></A> | |
| 56 | <BR> | |
| 57 | 6.13 The <tt class="keyword">global</tt> statement | |
| 58 | </H1> | |
| 59 | <a id='l2h-557' xml:id='l2h-557'></a> | |
| 60 | <P> | |
| 61 | <dl><dd class="grammar"> | |
| 62 | <div class="productions"> | |
| 63 | <table> | |
| 64 | <tr> | |
| 65 | <td><a id='tok-global_stmt' xml:id='tok-global_stmt'>global_stmt</a></td> | |
| 66 | <td>::=</td> | |
| 67 | <td>"global" <a class='grammartoken' href="identifiers.html#tok-identifier">identifier</a> ("," <a class='grammartoken' href="identifiers.html#tok-identifier">identifier</a>)*</td></tr> | |
| 68 | </table> | |
| 69 | </div> | |
| 70 | <a class="grammar-footer" | |
| 71 | href="grammar.txt" type="text/plain" | |
| 72 | >Download entire grammar as text.</a> | |
| 73 | </dd></dl> | |
| 74 | ||
| 75 | <P> | |
| 76 | The <tt class="keyword">global</tt> statement is a declaration which holds for the | |
| 77 | entire current code block. It means that the listed identifiers are to be | |
| 78 | interpreted as globals. It would be impossible to assign to a global | |
| 79 | variable without <tt class="keyword">global</tt>, although free variables may refer | |
| 80 | to globals without being declared global. | |
| 81 | <a id='l2h-558' xml:id='l2h-558'></a> | |
| 82 | <P> | |
| 83 | Names listed in a <tt class="keyword">global</tt> statement must not be used in the same | |
| 84 | code block textually preceding that <tt class="keyword">global</tt> statement. | |
| 85 | ||
| 86 | <P> | |
| 87 | Names listed in a <tt class="keyword">global</tt> statement must not be defined as formal | |
| 88 | parameters or in a <tt class="keyword">for</tt> loop control target, <tt class="keyword">class</tt> | |
| 89 | definition, function definition, or <tt class="keyword">import</tt> statement. | |
| 90 | ||
| 91 | <P> | |
| 92 | (The current implementation does not enforce the latter two | |
| 93 | restrictions, but programs should not abuse this freedom, as future | |
| 94 | implementations may enforce them or silently change the meaning of the | |
| 95 | program.) | |
| 96 | ||
| 97 | <P> | |
| 98 | <strong>Programmer's note:</strong> | |
| 99 | the <tt class="keyword">global</tt> is a directive to the parser. It | |
| 100 | applies only to code parsed at the same time as the <tt class="keyword">global</tt> | |
| 101 | statement. In particular, a <tt class="keyword">global</tt> statement contained in an | |
| 102 | <tt class="keyword">exec</tt> statement does not affect the code block <em>containing</em> | |
| 103 | the <tt class="keyword">exec</tt> statement, and code contained in an <tt class="keyword">exec</tt> | |
| 104 | statement is unaffected by <tt class="keyword">global</tt> statements in the code | |
| 105 | containing the <tt class="keyword">exec</tt> statement. The same applies to the | |
| 106 | <tt class="function">eval()</tt>, <tt class="function">execfile()</tt> and <tt class="function">compile()</tt> functions. | |
| 107 | <a id='l2h-559' xml:id='l2h-559'></a><a id='l2h-560' xml:id='l2h-560'></a><a id='l2h-561' xml:id='l2h-561'></a><a id='l2h-562' xml:id='l2h-562'></a> | |
| 108 | <P> | |
| 109 | ||
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| 141 | </div> | |
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| 144 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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